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alsdec.c
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1/*
2 * MPEG-4 ALS decoder
3 * Copyright (c) 2009 Thilo Borgmann <thilo.borgmann _at_ mail.de>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22/**
23 * @file
24 * MPEG-4 ALS decoder
25 * @author Thilo Borgmann <thilo.borgmann _at_ mail.de>
26 */
27
28#include <inttypes.h>
29
30#include "avcodec.h"
31#include "get_bits.h"
32#include "unary.h"
33#include "mpeg4audio.h"
34#include "bgmc.h"
35#include "bswapdsp.h"
36#include "codec_internal.h"
37#include "decode.h"
38#include "internal.h"
39#include "mlz.h"
40#include "libavutil/mem.h"
41#include "libavutil/opt.h"
42#include "libavutil/samplefmt.h"
43#include "libavutil/crc.h"
44#include "libavutil/softfloat_ieee754.h"
45#include "libavutil/intreadwrite.h"
46
47#include <stdint.h>
48
49/** Rice parameters and corresponding index offsets for decoding the
50 * indices of scaled PARCOR values. The table chosen is set globally
51 * by the encoder and stored in ALSSpecificConfig.
52 */
53static const int8_t parcor_rice_table[3][20][2] = {
54 { {-52, 4}, {-29, 5}, {-31, 4}, { 19, 4}, {-16, 4},
55 { 12, 3}, { -7, 3}, { 9, 3}, { -5, 3}, { 6, 3},
56 { -4, 3}, { 3, 3}, { -3, 2}, { 3, 2}, { -2, 2},
57 { 3, 2}, { -1, 2}, { 2, 2}, { -1, 2}, { 2, 2} },
58 { {-58, 3}, {-42, 4}, {-46, 4}, { 37, 5}, {-36, 4},
59 { 29, 4}, {-29, 4}, { 25, 4}, {-23, 4}, { 20, 4},
60 {-17, 4}, { 16, 4}, {-12, 4}, { 12, 3}, {-10, 4},
61 { 7, 3}, { -4, 4}, { 3, 3}, { -1, 3}, { 1, 3} },
62 { {-59, 3}, {-45, 5}, {-50, 4}, { 38, 4}, {-39, 4},
63 { 32, 4}, {-30, 4}, { 25, 3}, {-23, 3}, { 20, 3},
64 {-20, 3}, { 16, 3}, {-13, 3}, { 10, 3}, { -7, 3},
65 { 3, 3}, { 0, 3}, { -1, 3}, { 2, 3}, { -1, 2} }
66};
67
68
69/** Scaled PARCOR values used for the first two PARCOR coefficients.
70 * To be indexed by the Rice coded indices.
71 * Generated by: parcor_scaled_values[i] = 32 + ((i * (i+1)) << 7) - (1 << 20)
72 * Actual values are divided by 32 in order to be stored in 16 bits.
73 */
74static const int16_t parcor_scaled_values[] = {
75 -1048544 / 32, -1048288 / 32, -1047776 / 32, -1047008 / 32,
76 -1045984 / 32, -1044704 / 32, -1043168 / 32, -1041376 / 32,
77 -1039328 / 32, -1037024 / 32, -1034464 / 32, -1031648 / 32,
78 -1028576 / 32, -1025248 / 32, -1021664 / 32, -1017824 / 32,
79 -1013728 / 32, -1009376 / 32, -1004768 / 32, -999904 / 32,
80 -994784 / 32, -989408 / 32, -983776 / 32, -977888 / 32,
81 -971744 / 32, -965344 / 32, -958688 / 32, -951776 / 32,
82 -944608 / 32, -937184 / 32, -929504 / 32, -921568 / 32,
83 -913376 / 32, -904928 / 32, -896224 / 32, -887264 / 32,
84 -878048 / 32, -868576 / 32, -858848 / 32, -848864 / 32,
85 -838624 / 32, -828128 / 32, -817376 / 32, -806368 / 32,
86 -795104 / 32, -783584 / 32, -771808 / 32, -759776 / 32,
87 -747488 / 32, -734944 / 32, -722144 / 32, -709088 / 32,
88 -695776 / 32, -682208 / 32, -668384 / 32, -654304 / 32,
89 -639968 / 32, -625376 / 32, -610528 / 32, -595424 / 32,
90 -580064 / 32, -564448 / 32, -548576 / 32, -532448 / 32,
91 -516064 / 32, -499424 / 32, -482528 / 32, -465376 / 32,
92 -447968 / 32, -430304 / 32, -412384 / 32, -394208 / 32,
93 -375776 / 32, -357088 / 32, -338144 / 32, -318944 / 32,
94 -299488 / 32, -279776 / 32, -259808 / 32, -239584 / 32,
95 -219104 / 32, -198368 / 32, -177376 / 32, -156128 / 32,
96 -134624 / 32, -112864 / 32, -90848 / 32, -68576 / 32,
97 -46048 / 32, -23264 / 32, -224 / 32, 23072 / 32,
98 46624 / 32, 70432 / 32, 94496 / 32, 118816 / 32,
99 143392 / 32, 168224 / 32, 193312 / 32, 218656 / 32,
100 244256 / 32, 270112 / 32, 296224 / 32, 322592 / 32,
101 349216 / 32, 376096 / 32, 403232 / 32, 430624 / 32,
102 458272 / 32, 486176 / 32, 514336 / 32, 542752 / 32,
103 571424 / 32, 600352 / 32, 629536 / 32, 658976 / 32,
104 688672 / 32, 718624 / 32, 748832 / 32, 779296 / 32,
105 810016 / 32, 840992 / 32, 872224 / 32, 903712 / 32,
106 935456 / 32, 967456 / 32, 999712 / 32, 1032224 / 32
107};
108
109
110/** Gain values of p(0) for long-term prediction.
111 * To be indexed by the Rice coded indices.
112 */
113static const uint8_t ltp_gain_values [4][4] = {
114 { 0, 8, 16, 24},
115 {32, 40, 48, 56},
116 {64, 70, 76, 82},
117 {88, 92, 96, 100}
118};
119
120
121/** Inter-channel weighting factors for multi-channel correlation.
122 * To be indexed by the Rice coded indices.
123 */
124static const int16_t mcc_weightings[] = {
125 204, 192, 179, 166, 153, 140, 128, 115,
126 102, 89, 76, 64, 51, 38, 25, 12,
127 0, -12, -25, -38, -51, -64, -76, -89,
128 -102, -115, -128, -140, -153, -166, -179, -192
129};
130
131
132/** Tail codes used in arithmetic coding using block Gilbert-Moore codes.
133 */
134static const uint8_t tail_code[16][6] = {
135 { 74, 44, 25, 13, 7, 3},
136 { 68, 42, 24, 13, 7, 3},
137 { 58, 39, 23, 13, 7, 3},
138 {126, 70, 37, 19, 10, 5},
139 {132, 70, 37, 20, 10, 5},
140 {124, 70, 38, 20, 10, 5},
141 {120, 69, 37, 20, 11, 5},
142 {116, 67, 37, 20, 11, 5},
143 {108, 66, 36, 20, 10, 5},
144 {102, 62, 36, 20, 10, 5},
145 { 88, 58, 34, 19, 10, 5},
146 {162, 89, 49, 25, 13, 7},
147 {156, 87, 49, 26, 14, 7},
148 {150, 86, 47, 26, 14, 7},
149 {142, 84, 47, 26, 14, 7},
150 {131, 79, 46, 26, 14, 7}
151};
152
153
159
160
161typedef struct ALSSpecificConfig {
162 uint32_t samples; ///< number of samples, 0xFFFFFFFF if unknown
163 int resolution; ///< 000 = 8-bit; 001 = 16-bit; 010 = 24-bit; 011 = 32-bit
164 int floating; ///< 1 = IEEE 32-bit floating-point, 0 = integer
165 int msb_first; ///< 1 = original CRC calculated on big-endian system, 0 = little-endian
166 int frame_length; ///< frame length for each frame (last frame may differ)
167 int ra_distance; ///< distance between RA frames (in frames, 0...255)
168 enum RA_Flag ra_flag; ///< indicates where the size of ra units is stored
169 int adapt_order; ///< adaptive order: 1 = on, 0 = off
170 int coef_table; ///< table index of Rice code parameters
171 int long_term_prediction; ///< long term prediction (LTP): 1 = on, 0 = off
172 int max_order; ///< maximum prediction order (0..1023)
173 int block_switching; ///< number of block switching levels
174 int bgmc; ///< "Block Gilbert-Moore Code": 1 = on, 0 = off (Rice coding only)
175 int sb_part; ///< sub-block partition
176 int joint_stereo; ///< joint stereo: 1 = on, 0 = off
177 int mc_coding; ///< extended inter-channel coding (multi channel coding): 1 = on, 0 = off
178 int chan_config; ///< indicates that a chan_config_info field is present
179 int chan_sort; ///< channel rearrangement: 1 = on, 0 = off
180 int rlslms; ///< use "Recursive Least Square-Least Mean Square" predictor: 1 = on, 0 = off
181 int chan_config_info; ///< mapping of channels to loudspeaker locations. Unused until setting channel configuration is implemented.
182 int *chan_pos; ///< original channel positions
183 int crc_enabled; ///< enable Cyclic Redundancy Checksum
184} ALSSpecificConfig;
185
186
195
196
197typedef struct ALSDecContext {
198 AVClass *av_class;
199 AVCodecContext *avctx;
200 ALSSpecificConfig sconf;
201 GetBitContext gb;
202 BswapDSPContext bdsp;
203 const AVCRC *crc_table;
204 uint32_t crc_org; ///< CRC value of the original input data
205 uint32_t crc; ///< CRC value calculated from decoded data
206 unsigned int cur_frame_length; ///< length of the current frame to decode
207 unsigned int frame_id; ///< the frame ID / number of the current frame
208 unsigned int js_switch; ///< if true, joint-stereo decoding is enforced
209 unsigned int cs_switch; ///< if true, channel rearrangement is done
210 unsigned int num_blocks; ///< number of blocks used in the current frame
211 unsigned int s_max; ///< maximum Rice parameter allowed in entropy coding
212 uint8_t *bgmc_lut; ///< pointer at lookup tables used for BGMC
213 int *bgmc_lut_status; ///< pointer at lookup table status flags used for BGMC
214 int ltp_lag_length; ///< number of bits used for ltp lag value
215 int *const_block; ///< contains const_block flags for all channels
216 unsigned int *shift_lsbs; ///< contains shift_lsbs flags for all channels
217 unsigned int *opt_order; ///< contains opt_order flags for all channels
218 int *store_prev_samples; ///< contains store_prev_samples flags for all channels
219 int *use_ltp; ///< contains use_ltp flags for all channels
220 int *ltp_lag; ///< contains ltp lag values for all channels
221 int **ltp_gain; ///< gain values for ltp 5-tap filter for a channel
222 int *ltp_gain_buffer; ///< contains all gain values for ltp 5-tap filter
223 int32_t **quant_cof; ///< quantized parcor coefficients for a channel
224 int32_t *quant_cof_buffer; ///< contains all quantized parcor coefficients
225 int32_t **lpc_cof; ///< coefficients of the direct form prediction filter for a channel
226 int32_t *lpc_cof_buffer; ///< contains all coefficients of the direct form prediction filter
227 int32_t *lpc_cof_reversed_buffer; ///< temporary buffer to set up a reversed version of lpc_cof_buffer
228 ALSChannelData **chan_data; ///< channel data for multi-channel correlation
229 ALSChannelData *chan_data_buffer; ///< contains channel data for all channels
230 int *reverted_channels; ///< stores a flag for each reverted channel
231 int32_t *prev_raw_samples; ///< contains unshifted raw samples from the previous block
232 int32_t **raw_samples; ///< decoded raw samples for each channel
233 int32_t *raw_buffer; ///< contains all decoded raw samples including carryover samples
234 uint8_t *crc_buffer; ///< buffer of byte order corrected samples used for CRC check
235 MLZ* mlz; ///< masked lz decompression structure
236 SoftFloat_IEEE754 *acf; ///< contains common multiplier for all channels
237 int *last_acf_mantissa; ///< contains the last acf mantissa data of common multiplier for all channels
238 int *shift_value; ///< value by which the binary point is to be shifted for all channels
239 int *last_shift_value; ///< contains last shift value for all channels
240 int **raw_mantissa; ///< decoded mantissa bits of the difference signal
241 unsigned char *larray; ///< buffer to store the output of masked lz decompression
242 int *nbits; ///< contains the number of bits to read for masked lz decompression for all samples
243 int highest_decoded_channel;
244 int user_max_order; ///< user specified maximum prediction order
245} ALSDecContext;
246
247
248typedef struct ALSBlockData {
249 unsigned int block_length; ///< number of samples within the block
250 unsigned int ra_block; ///< if true, this is a random access block
251 int *const_block; ///< if true, this is a constant value block
252 int js_blocks; ///< true if this block contains a difference signal
253 unsigned int *shift_lsbs; ///< shift of values for this block
254 unsigned int *opt_order; ///< prediction order of this block
255 int *store_prev_samples;///< if true, carryover samples have to be stored
256 int *use_ltp; ///< if true, long-term prediction is used
257 int *ltp_lag; ///< lag value for long-term prediction
258 int *ltp_gain; ///< gain values for ltp 5-tap filter
259 int32_t *quant_cof; ///< quantized parcor coefficients
260 int32_t *lpc_cof; ///< coefficients of the direct form prediction
261 int32_t *raw_samples; ///< decoded raw samples / residuals for this block
262 int32_t *prev_raw_samples; ///< contains unshifted raw samples from the previous block
263 int32_t *raw_other; ///< decoded raw samples of the other channel of a channel pair
264} ALSBlockData;
265
266
267static av_cold void dprint_specific_config(ALSDecContext *ctx)
268{
269#ifdef DEBUG
270 AVCodecContext *avctx = ctx->avctx;
271 ALSSpecificConfig *sconf = &ctx->sconf;
272
273 ff_dlog(avctx, "resolution = %i\n", sconf->resolution);
274 ff_dlog(avctx, "floating = %i\n", sconf->floating);
275 ff_dlog(avctx, "frame_length = %i\n", sconf->frame_length);
276 ff_dlog(avctx, "ra_distance = %i\n", sconf->ra_distance);
277 ff_dlog(avctx, "ra_flag = %i\n", sconf->ra_flag);
278 ff_dlog(avctx, "adapt_order = %i\n", sconf->adapt_order);
279 ff_dlog(avctx, "coef_table = %i\n", sconf->coef_table);
280 ff_dlog(avctx, "long_term_prediction = %i\n", sconf->long_term_prediction);
281 ff_dlog(avctx, "max_order = %i\n", sconf->max_order);
282 ff_dlog(avctx, "block_switching = %i\n", sconf->block_switching);
283 ff_dlog(avctx, "bgmc = %i\n", sconf->bgmc);
284 ff_dlog(avctx, "sb_part = %i\n", sconf->sb_part);
285 ff_dlog(avctx, "joint_stereo = %i\n", sconf->joint_stereo);
286 ff_dlog(avctx, "mc_coding = %i\n", sconf->mc_coding);
287 ff_dlog(avctx, "chan_config = %i\n", sconf->chan_config);
288 ff_dlog(avctx, "chan_sort = %i\n", sconf->chan_sort);
289 ff_dlog(avctx, "RLSLMS = %i\n", sconf->rlslms);
290 ff_dlog(avctx, "chan_config_info = %i\n", sconf->chan_config_info);
291#endif
292}
293
294
295/** Read an ALSSpecificConfig from a buffer into the output struct.
296 */
297static av_cold int read_specific_config(ALSDecContext *ctx)
298{
299 GetBitContext gb;
300 uint64_t ht_size;
301 int i, config_offset;
302 MPEG4AudioConfig m4ac = {0};
303 ALSSpecificConfig *sconf = &ctx->sconf;
304 AVCodecContext *avctx = ctx->avctx;
305 uint32_t als_id, header_size, trailer_size;
306 int ret;
307
308 if ((ret = init_get_bits8(&gb, avctx->extradata, avctx->extradata_size)) < 0)
309 return ret;
310
311 config_offset = avpriv_mpeg4audio_get_config2(&m4ac, avctx->extradata,
312 avctx->extradata_size, 1, avctx);
313
314 if (config_offset < 0)
315 return AVERROR_INVALIDDATA;
316
317 skip_bits_long(&gb, config_offset);
318
319 if (get_bits_left(&gb) < (30 << 3))
320 return AVERROR_INVALIDDATA;
321
322 // read the fixed items
323 als_id = get_bits_long(&gb, 32);
324 avctx->sample_rate = m4ac.sample_rate;
325 skip_bits_long(&gb, 32); // sample rate already known
326 sconf->samples = get_bits_long(&gb, 32);
327
328 if (avctx->ch_layout.nb_channels != m4ac.channels) {
329 av_channel_layout_uninit(&avctx->ch_layout);
330 avctx->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
331 avctx->ch_layout.nb_channels = m4ac.channels;
332 }
333
334 skip_bits(&gb, 16); // number of channels already known
335 skip_bits(&gb, 3); // skip file_type
336 sconf->resolution = get_bits(&gb, 3);
337 sconf->floating = get_bits1(&gb);
338 sconf->msb_first = get_bits1(&gb);
339 sconf->frame_length = get_bits(&gb, 16) + 1;
340 sconf->ra_distance = get_bits(&gb, 8);
341 sconf->ra_flag = get_bits(&gb, 2);
342 sconf->adapt_order = get_bits1(&gb);
343 sconf->coef_table = get_bits(&gb, 2);
344 sconf->long_term_prediction = get_bits1(&gb);
345 sconf->max_order = get_bits(&gb, 10);
346 sconf->block_switching = get_bits(&gb, 2);
347 sconf->bgmc = get_bits1(&gb);
348 sconf->sb_part = get_bits1(&gb);
349 sconf->joint_stereo = get_bits1(&gb);
350 sconf->mc_coding = get_bits1(&gb);
351 sconf->chan_config = get_bits1(&gb);
352 sconf->chan_sort = get_bits1(&gb);
353 sconf->crc_enabled = get_bits1(&gb);
354 sconf->rlslms = get_bits1(&gb);
355 skip_bits(&gb, 5); // skip 5 reserved bits
356 skip_bits1(&gb); // skip aux_data_enabled
357
358 if (sconf->max_order > ctx->user_max_order) {
359 av_log(avctx, AV_LOG_ERROR, "order %d exceeds specified max %d\n", sconf->max_order, ctx->user_max_order);
360 return AVERROR_INVALIDDATA;
361 }
362
363
364 // check for ALSSpecificConfig struct
365 if (als_id != MKBETAG('A','L','S','\0'))
366 return AVERROR_INVALIDDATA;
367
368 if (avctx->ch_layout.nb_channels > FF_SANE_NB_CHANNELS) {
369 avpriv_request_sample(avctx, "Huge number of channels");
370 return AVERROR_PATCHWELCOME;
371 }
372
373 if (avctx->ch_layout.nb_channels == 0)
374 return AVERROR_INVALIDDATA;
375
376 ctx->cur_frame_length = sconf->frame_length;
377
378 // read channel config
379 if (sconf->chan_config)
380 sconf->chan_config_info = get_bits(&gb, 16);
381 // TODO: use this to set avctx->channel_layout
382
383
384 // read channel sorting
385 if (sconf->chan_sort && avctx->ch_layout.nb_channels > 1) {
386 int chan_pos_bits = av_ceil_log2(avctx->ch_layout.nb_channels);
387 int bits_needed = avctx->ch_layout.nb_channels * chan_pos_bits + 7;
388 if (get_bits_left(&gb) < bits_needed)
389 return AVERROR_INVALIDDATA;
390
391 if (!(sconf->chan_pos = av_malloc_array(avctx->ch_layout.nb_channels, sizeof(*sconf->chan_pos))))
392 return AVERROR(ENOMEM);
393
394 ctx->cs_switch = 1;
395
396 for (i = 0; i < avctx->ch_layout.nb_channels; i++) {
397 sconf->chan_pos[i] = -1;
398 }
399
400 for (i = 0; i < avctx->ch_layout.nb_channels; i++) {
401 int idx;
402
403 idx = get_bits(&gb, chan_pos_bits);
404 if (idx >= avctx->ch_layout.nb_channels || sconf->chan_pos[idx] != -1) {
405 av_log(avctx, AV_LOG_WARNING, "Invalid channel reordering.\n");
406 ctx->cs_switch = 0;
407 break;
408 }
409 sconf->chan_pos[idx] = i;
410 }
411
412 align_get_bits(&gb);
413 }
414
415
416 // read fixed header and trailer sizes,
417 // if size = 0xFFFFFFFF then there is no data field!
418 if (get_bits_left(&gb) < 64)
419 return AVERROR_INVALIDDATA;
420
421 header_size = get_bits_long(&gb, 32);
422 trailer_size = get_bits_long(&gb, 32);
423 if (header_size == 0xFFFFFFFF)
424 header_size = 0;
425 if (trailer_size == 0xFFFFFFFF)
426 trailer_size = 0;
427
428 ht_size = ((int64_t)(header_size) + (int64_t)(trailer_size)) << 3;
429
430
431 // skip the header and trailer data
432 if (get_bits_left(&gb) < ht_size)
433 return AVERROR_INVALIDDATA;
434
435 if (ht_size > INT32_MAX)
436 return AVERROR_PATCHWELCOME;
437
438 skip_bits_long(&gb, ht_size);
439
440
441 // initialize CRC calculation
442 if (sconf->crc_enabled) {
443 if (get_bits_left(&gb) < 32)
444 return AVERROR_INVALIDDATA;
445
446 if (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL)) {
447 ctx->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
448 ctx->crc = 0xFFFFFFFF;
449 ctx->crc_org = ~get_bits_long(&gb, 32);
450 } else
451 skip_bits_long(&gb, 32);
452 }
453
454
455 // no need to read the rest of ALSSpecificConfig (ra_unit_size & aux data)
456
457 dprint_specific_config(ctx);
458
459 return 0;
460}
461
462
463/** Check the ALSSpecificConfig for unsupported features.
464 */
465static int check_specific_config(ALSDecContext *ctx)
466{
467 ALSSpecificConfig *sconf = &ctx->sconf;
468 int error = 0;
469
470 // report unsupported feature and set error value
471 #define MISSING_ERR(cond, str, errval) \
472 { \
473 if (cond) { \
474 avpriv_report_missing_feature(ctx->avctx, \
475 str); \
476 error = errval; \
477 } \
478 }
479
480 MISSING_ERR(sconf->rlslms, "Adaptive RLS-LMS prediction", AVERROR_PATCHWELCOME);
481
482 return error;
483}
484
485
486/** Parse the bs_info field to extract the block partitioning used in
487 * block switching mode, refer to ISO/IEC 14496-3, section 11.6.2.
488 */
489static void parse_bs_info(const uint32_t bs_info, unsigned int n,
490 unsigned int div, unsigned int **div_blocks,
491 unsigned int *num_blocks)
492{
493 if (n < 31 && ((bs_info << n) & 0x40000000)) {
494 // if the level is valid and the investigated bit n is set
495 // then recursively check both children at bits (2n+1) and (2n+2)
496 n *= 2;
497 div += 1;
498 parse_bs_info(bs_info, n + 1, div, div_blocks, num_blocks);
499 parse_bs_info(bs_info, n + 2, div, div_blocks, num_blocks);
500 } else {
501 // else the bit is not set or the last level has been reached
502 // (bit implicitly not set)
503 **div_blocks = div;
504 (*div_blocks)++;
505 (*num_blocks)++;
506 }
507}
508
509
510/** Read and decode a Rice codeword.
511 */
512static int32_t decode_rice(GetBitContext *gb, unsigned int k)
513{
514 int max = get_bits_left(gb) - k;
515 unsigned q = get_unary(gb, 0, max);
516 int r = k ? get_bits1(gb) : !(q & 1);
517
518 if (k > 1) {
519 q <<= (k - 1);
520 q += get_bits_long(gb, k - 1);
521 } else if (!k) {
522 q >>= 1;
523 }
524 return r ? q : ~q;
525}
526
527
528/** Convert PARCOR coefficient k to direct filter coefficient.
529 */
530static void parcor_to_lpc(unsigned int k, const int32_t *par, int32_t *cof)
531{
532 int i, j;
533
534 for (i = 0, j = k - 1; i < j; i++, j--) {
535 unsigned tmp1 = ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20);
536 cof[j] += ((MUL64(par[k], cof[i]) + (1 << 19)) >> 20);
537 cof[i] += tmp1;
538 }
539 if (i == j)
540 cof[i] += ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20);
541
542 cof[k] = par[k];
543}
544
545
546/** Read block switching field if necessary and set actual block sizes.
547 * Also assure that the block sizes of the last frame correspond to the
548 * actual number of samples.
549 */
550static void get_block_sizes(ALSDecContext *ctx, unsigned int *div_blocks,
551 uint32_t *bs_info)
552{
553 ALSSpecificConfig *sconf = &ctx->sconf;
554 GetBitContext *gb = &ctx->gb;
555 unsigned int *ptr_div_blocks = div_blocks;
556 unsigned int b;
557
558 if (sconf->block_switching) {
559 unsigned int bs_info_len = 1 << (sconf->block_switching + 2);
560 *bs_info = get_bits_long(gb, bs_info_len);
561 *bs_info <<= (32 - bs_info_len);
562 }
563
564 ctx->num_blocks = 0;
565 parse_bs_info(*bs_info, 0, 0, &ptr_div_blocks, &ctx->num_blocks);
566
567 // The last frame may have an overdetermined block structure given in
568 // the bitstream. In that case the defined block structure would need
569 // more samples than available to be consistent.
570 // The block structure is actually used but the block sizes are adapted
571 // to fit the actual number of available samples.
572 // Example: 5 samples, 2nd level block sizes: 2 2 2 2.
573 // This results in the actual block sizes: 2 2 1 0.
574 // This is not specified in 14496-3 but actually done by the reference
575 // codec RM22 revision 2.
576 // This appears to happen in case of an odd number of samples in the last
577 // frame which is actually not allowed by the block length switching part
578 // of 14496-3.
579 // The ALS conformance files feature an odd number of samples in the last
580 // frame.
581
582 for (b = 0; b < ctx->num_blocks; b++)
583 div_blocks[b] = ctx->sconf.frame_length >> div_blocks[b];
584
585 if (ctx->cur_frame_length != ctx->sconf.frame_length) {
586 unsigned int remaining = ctx->cur_frame_length;
587
588 for (b = 0; b < ctx->num_blocks; b++) {
589 if (remaining <= div_blocks[b]) {
590 div_blocks[b] = remaining;
591 ctx->num_blocks = b + 1;
592 break;
593 }
594
595 remaining -= div_blocks[b];
596 }
597 }
598}
599
600
601/** Read the block data for a constant block
602 */
603static int read_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
604{
605 ALSSpecificConfig *sconf = &ctx->sconf;
606 AVCodecContext *avctx = ctx->avctx;
607 GetBitContext *gb = &ctx->gb;
608
609 if (bd->block_length <= 0)
610 return AVERROR_INVALIDDATA;
611
612 *bd->raw_samples = 0;
613 *bd->const_block = get_bits1(gb); // 1 = constant value, 0 = zero block (silence)
614 bd->js_blocks = get_bits1(gb);
615
616 // skip 5 reserved bits
617 skip_bits(gb, 5);
618
619 if (*bd->const_block) {
620 unsigned int const_val_bits = sconf->floating ? 24 : avctx->bits_per_raw_sample;
621 *bd->raw_samples = get_sbits_long(gb, const_val_bits);
622 }
623
624 // ensure constant block decoding by reusing this field
625 *bd->const_block = 1;
626
627 return 0;
628}
629
630
631/** Decode the block data for a constant block
632 */
633static void decode_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
634{
635 int smp = bd->block_length - 1;
636 int32_t val = *bd->raw_samples;
637 int32_t *dst = bd->raw_samples + 1;
638
639 // write raw samples into buffer
640 for (; smp; smp--)
641 *dst++ = val;
642}
643
644
645/** Read the block data for a non-constant block
646 */
647static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
648{
649 ALSSpecificConfig *sconf = &ctx->sconf;
650 AVCodecContext *avctx = ctx->avctx;
651 GetBitContext *gb = &ctx->gb;
652 unsigned int k;
653 unsigned int s[8];
654 unsigned int sx[8];
655 unsigned int sub_blocks, log2_sub_blocks, sb_length;
656 unsigned int start = 0;
657 unsigned int opt_order;
658 int sb;
659 int32_t *quant_cof = bd->quant_cof;
660 int32_t *current_res;
661
662
663 // ensure variable block decoding by reusing this field
664 *bd->const_block = 0;
665
666 *bd->opt_order = 1;
667 bd->js_blocks = get_bits1(gb);
668
669 opt_order = *bd->opt_order;
670
671 // determine the number of subblocks for entropy decoding
672 if (!sconf->bgmc && !sconf->sb_part) {
673 log2_sub_blocks = 0;
674 } else {
675 if (sconf->bgmc && sconf->sb_part)
676 log2_sub_blocks = get_bits(gb, 2);
677 else
678 log2_sub_blocks = 2 * get_bits1(gb);
679 }
680
681 sub_blocks = 1 << log2_sub_blocks;
682
683 // do not continue in case of a damaged stream since
684 // block_length must be evenly divisible by sub_blocks
685 if (bd->block_length & (sub_blocks - 1) || bd->block_length <= 0) {
686 av_log(avctx, AV_LOG_WARNING,
687 "Block length is not evenly divisible by the number of subblocks.\n");
688 return AVERROR_INVALIDDATA;
689 }
690
691 sb_length = bd->block_length >> log2_sub_blocks;
692
693 if (sconf->bgmc) {
694 s[0] = get_bits(gb, 8 + (sconf->resolution > 1));
695 for (k = 1; k < sub_blocks; k++)
696 s[k] = s[k - 1] + decode_rice(gb, 2);
697
698 for (k = 0; k < sub_blocks; k++) {
699 sx[k] = s[k] & 0x0F;
700 s [k] >>= 4;
701 }
702 } else {
703 s[0] = get_bits(gb, 4 + (sconf->resolution > 1));
704 for (k = 1; k < sub_blocks; k++)
705 s[k] = s[k - 1] + decode_rice(gb, 0);
706 }
707 for (k = 1; k < sub_blocks; k++)
708 if (s[k] > 32) {
709 av_log(avctx, AV_LOG_ERROR, "k invalid for rice code.\n");
710 return AVERROR_INVALIDDATA;
711 }
712
713 if (get_bits1(gb))
714 *bd->shift_lsbs = get_bits(gb, 4) + 1;
715
716 *bd->store_prev_samples = (bd->js_blocks && bd->raw_other) || *bd->shift_lsbs;
717
718
719 if (!sconf->rlslms) {
720 if (sconf->adapt_order && sconf->max_order) {
721 int opt_order_length = av_ceil_log2(av_clip((bd->block_length >> 3) - 1,
722 2, sconf->max_order + 1));
723 *bd->opt_order = get_bits(gb, opt_order_length);
724 if (*bd->opt_order > sconf->max_order) {
725 *bd->opt_order = sconf->max_order;
726 av_log(avctx, AV_LOG_ERROR, "Predictor order too large.\n");
727 return AVERROR_INVALIDDATA;
728 }
729 } else {
730 *bd->opt_order = sconf->max_order;
731 }
732 opt_order = *bd->opt_order;
733
734 if (opt_order) {
735 int add_base;
736
737 if (sconf->coef_table == 3) {
738 add_base = 0x7F;
739
740 // read coefficient 0
741 quant_cof[0] = 32 * parcor_scaled_values[get_bits(gb, 7)];
742
743 // read coefficient 1
744 if (opt_order > 1)
745 quant_cof[1] = -32 * parcor_scaled_values[get_bits(gb, 7)];
746
747 // read coefficients 2 to opt_order
748 for (k = 2; k < opt_order; k++)
749 quant_cof[k] = get_bits(gb, 7);
750 } else {
751 int k_max;
752 add_base = 1;
753
754 // read coefficient 0 to 19
755 k_max = FFMIN(opt_order, 20);
756 for (k = 0; k < k_max; k++) {
757 int rice_param = parcor_rice_table[sconf->coef_table][k][1];
758 int offset = parcor_rice_table[sconf->coef_table][k][0];
759 quant_cof[k] = decode_rice(gb, rice_param) + offset;
760 if (quant_cof[k] < -64 || quant_cof[k] > 63) {
761 av_log(avctx, AV_LOG_ERROR,
762 "quant_cof %"PRId32" is out of range.\n",
763 quant_cof[k]);
764 return AVERROR_INVALIDDATA;
765 }
766 }
767
768 // read coefficients 20 to 126
769 k_max = FFMIN(opt_order, 127);
770 for (; k < k_max; k++)
771 quant_cof[k] = decode_rice(gb, 2) + (k & 1);
772
773 // read coefficients 127 to opt_order
774 for (; k < opt_order; k++)
775 quant_cof[k] = decode_rice(gb, 1);
776
777 quant_cof[0] = 32 * parcor_scaled_values[quant_cof[0] + 64];
778
779 if (opt_order > 1)
780 quant_cof[1] = -32 * parcor_scaled_values[quant_cof[1] + 64];
781 }
782
783 for (k = 2; k < opt_order; k++)
784 quant_cof[k] = (quant_cof[k] * (1U << 14)) + (add_base << 13);
785 }
786 }
787
788 // read LTP gain and lag values
789 if (sconf->long_term_prediction) {
790 *bd->use_ltp = get_bits1(gb);
791
792 if (*bd->use_ltp) {
793 int r, c;
794
795 bd->ltp_gain[0] = decode_rice(gb, 1) * 8;
796 bd->ltp_gain[1] = decode_rice(gb, 2) * 8;
797
798 r = get_unary(gb, 0, 4);
799 c = get_bits(gb, 2);
800 if (r >= 4) {
801 av_log(avctx, AV_LOG_ERROR, "r overflow\n");
802 return AVERROR_INVALIDDATA;
803 }
804
805 bd->ltp_gain[2] = ltp_gain_values[r][c];
806
807 bd->ltp_gain[3] = decode_rice(gb, 2) * 8;
808 bd->ltp_gain[4] = decode_rice(gb, 1) * 8;
809
810 *bd->ltp_lag = get_bits(gb, ctx->ltp_lag_length);
811 *bd->ltp_lag += FFMAX(4, opt_order + 1);
812 }
813 }
814
815 // read first value and residuals in case of a random access block
816 if (bd->ra_block) {
817 start = FFMIN(opt_order, 3);
818 av_assert0(sb_length <= sconf->frame_length);
819 if (sb_length <= start) {
820 // opt_order or sb_length may be corrupted, either way this is unsupported and not well defined in the specification
821 av_log(avctx, AV_LOG_ERROR, "Sub block length smaller or equal start\n");
822 return AVERROR_PATCHWELCOME;
823 }
824
825 if (opt_order)
826 bd->raw_samples[0] = decode_rice(gb, avctx->bits_per_raw_sample - 4);
827 if (opt_order > 1)
828 bd->raw_samples[1] = decode_rice(gb, FFMIN(s[0] + 3, ctx->s_max));
829 if (opt_order > 2)
830 bd->raw_samples[2] = decode_rice(gb, FFMIN(s[0] + 1, ctx->s_max));
831 }
832
833 // read all residuals
834 if (sconf->bgmc) {
835 int delta[8];
836 unsigned int k [8];
837 unsigned int b = av_clip((av_ceil_log2(bd->block_length) - 3) >> 1, 0, 5);
838
839 // read most significant bits
840 unsigned int high;
841 unsigned int low;
842 unsigned int value;
843
844 int ret = ff_bgmc_decode_init(gb, &high, &low, &value);
845 if (ret < 0)
846 return ret;
847
848 current_res = bd->raw_samples + start;
849
850 for (sb = 0; sb < sub_blocks; sb++) {
851 unsigned int sb_len = sb_length - (sb ? 0 : start);
852
853 k [sb] = s[sb] > b ? s[sb] - b : 0;
854 delta[sb] = 5 - s[sb] + k[sb];
855
856 if (k[sb] >= 32)
857 return AVERROR_INVALIDDATA;
858
859 ff_bgmc_decode(gb, sb_len, current_res,
860 delta[sb], sx[sb], &high, &low, &value, ctx->bgmc_lut, ctx->bgmc_lut_status);
861
862 current_res += sb_len;
863 }
864
865 ff_bgmc_decode_end(gb);
866
867
868 // read least significant bits and tails
869 current_res = bd->raw_samples + start;
870
871 for (sb = 0; sb < sub_blocks; sb++, start = 0) {
872 unsigned int cur_tail_code = tail_code[sx[sb]][delta[sb]];
873 unsigned int cur_k = k[sb];
874 unsigned int cur_s = s[sb];
875
876 for (; start < sb_length; start++) {
877 int32_t res = *current_res;
878
879 if (res == cur_tail_code) {
880 unsigned int max_msb = (2 + (sx[sb] > 2) + (sx[sb] > 10))
881 << (5 - delta[sb]);
882
883 res = decode_rice(gb, cur_s);
884
885 if (res >= 0) {
886 res += (max_msb ) << cur_k;
887 } else {
888 res -= (max_msb - 1) << cur_k;
889 }
890 } else {
891 if (res > cur_tail_code)
892 res--;
893
894 if (res & 1)
895 res = -res;
896
897 res >>= 1;
898
899 if (cur_k) {
900 res *= 1U << cur_k;
901 res |= get_bits_long(gb, cur_k);
902 }
903 }
904
905 *current_res++ = res;
906 }
907 }
908 } else {
909 current_res = bd->raw_samples + start;
910
911 for (sb = 0; sb < sub_blocks; sb++, start = 0)
912 for (; start < sb_length; start++)
913 *current_res++ = decode_rice(gb, s[sb]);
914 }
915
916 return 0;
917}
918
919
920/** Decode the block data for a non-constant block
921 */
922static int decode_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
923{
924 ALSSpecificConfig *sconf = &ctx->sconf;
925 unsigned int block_length = bd->block_length;
926 unsigned int smp = 0;
927 unsigned int k;
928 int opt_order = *bd->opt_order;
929 int sb;
930 int64_t y;
931 int32_t *quant_cof = bd->quant_cof;
932 int32_t *lpc_cof = bd->lpc_cof;
933 int32_t *raw_samples = bd->raw_samples;
934 int32_t *raw_samples_end = bd->raw_samples + bd->block_length;
935 int32_t *lpc_cof_reversed = ctx->lpc_cof_reversed_buffer;
936
937 // reverse long-term prediction
938 if (*bd->use_ltp) {
939 int ltp_smp;
940
941 for (ltp_smp = FFMAX(*bd->ltp_lag - 2, 0); ltp_smp < block_length; ltp_smp++) {
942 int center = ltp_smp - *bd->ltp_lag;
943 int begin = FFMAX(0, center - 2);
944 int end = center + 3;
945 int tab = 5 - (end - begin);
946 int base;
947
948 y = 1 << 6;
949
950 for (base = begin; base < end; base++, tab++)
951 y += (uint64_t)MUL64(bd->ltp_gain[tab], raw_samples[base]);
952
953 raw_samples[ltp_smp] += y >> 7;
954 }
955 }
956
957 // reconstruct all samples from residuals
958 if (bd->ra_block) {
959 for (smp = 0; smp < FFMIN(opt_order, block_length); smp++) {
960 y = 1 << 19;
961
962 for (sb = 0; sb < smp; sb++)
963 y += (uint64_t)MUL64(lpc_cof[sb], raw_samples[-(sb + 1)]);
964
965 *raw_samples++ -= y >> 20;
966 parcor_to_lpc(smp, quant_cof, lpc_cof);
967 }
968 } else {
969 for (k = 0; k < opt_order; k++)
970 parcor_to_lpc(k, quant_cof, lpc_cof);
971
972 // store previous samples in case that they have to be altered
973 if (*bd->store_prev_samples)
974 memcpy(bd->prev_raw_samples, raw_samples - sconf->max_order,
975 sizeof(*bd->prev_raw_samples) * sconf->max_order);
976
977 // reconstruct difference signal for prediction (joint-stereo)
978 if (bd->js_blocks && bd->raw_other) {
979 uint32_t *left, *right;
980
981 if (bd->raw_other > raw_samples) { // D = R - L
982 left = raw_samples;
983 right = bd->raw_other;
984 } else { // D = R - L
985 left = bd->raw_other;
986 right = raw_samples;
987 }
988
989 for (sb = -1; sb >= -sconf->max_order; sb--)
990 raw_samples[sb] = right[sb] - left[sb];
991 }
992
993 // reconstruct shifted signal
994 if (*bd->shift_lsbs)
995 for (sb = -1; sb >= -sconf->max_order; sb--)
996 raw_samples[sb] >>= *bd->shift_lsbs;
997 }
998
999 // reverse linear prediction coefficients for efficiency
1000 lpc_cof = lpc_cof + opt_order;
1001
1002 for (sb = 0; sb < opt_order; sb++)
1003 lpc_cof_reversed[sb] = lpc_cof[-(sb + 1)];
1004
1005 // reconstruct raw samples
1006 raw_samples = bd->raw_samples + smp;
1007 lpc_cof = lpc_cof_reversed + opt_order;
1008
1009 for (; raw_samples < raw_samples_end; raw_samples++) {
1010 y = 1 << 19;
1011
1012 for (sb = -opt_order; sb < 0; sb++)
1013 y += (uint64_t)MUL64(lpc_cof[sb], raw_samples[sb]);
1014
1015 *raw_samples -= y >> 20;
1016 }
1017
1018 raw_samples = bd->raw_samples;
1019
1020 // restore previous samples in case that they have been altered
1021 if (*bd->store_prev_samples)
1022 memcpy(raw_samples - sconf->max_order, bd->prev_raw_samples,
1023 sizeof(*raw_samples) * sconf->max_order);
1024
1025 return 0;
1026}
1027
1028
1029/** Read the block data.
1030 */
1031static int read_block(ALSDecContext *ctx, ALSBlockData *bd)
1032{
1033 int ret;
1034 GetBitContext *gb = &ctx->gb;
1035 ALSSpecificConfig *sconf = &ctx->sconf;
1036
1037 *bd->shift_lsbs = 0;
1038
1039 if (get_bits_left(gb) < 7)
1040 return AVERROR_INVALIDDATA;
1041
1042 // read block type flag and read the samples accordingly
1043 if (get_bits1(gb)) {
1044 ret = read_var_block_data(ctx, bd);
1045 } else {
1046 ret = read_const_block_data(ctx, bd);
1047 }
1048
1049 if (!sconf->mc_coding || ctx->js_switch)
1050 align_get_bits(gb);
1051
1052 return ret;
1053}
1054
1055
1056/** Decode the block data.
1057 */
1058static int decode_block(ALSDecContext *ctx, ALSBlockData *bd)
1059{
1060 unsigned int smp;
1061 int ret = 0;
1062
1063 // read block type flag and read the samples accordingly
1064 if (*bd->const_block)
1065 decode_const_block_data(ctx, bd);
1066 else
1067 ret = decode_var_block_data(ctx, bd); // always return 0
1068
1069 if (ret < 0)
1070 return ret;
1071
1072 // TODO: read RLSLMS extension data
1073
1074 if (*bd->shift_lsbs)
1075 for (smp = 0; smp < bd->block_length; smp++)
1076 bd->raw_samples[smp] = (unsigned)bd->raw_samples[smp] << *bd->shift_lsbs;
1077
1078 return 0;
1079}
1080
1081
1082/** Read and decode block data successively.
1083 */
1084static int read_decode_block(ALSDecContext *ctx, ALSBlockData *bd)
1085{
1086 int ret;
1087
1088 if ((ret = read_block(ctx, bd)) < 0)
1089 return ret;
1090
1091 return decode_block(ctx, bd);
1092}
1093
1094
1095/** Compute the number of samples left to decode for the current frame and
1096 * sets these samples to zero.
1097 */
1098static void zero_remaining(unsigned int b, unsigned int b_max,
1099 const unsigned int *div_blocks, int32_t *buf)
1100{
1101 unsigned int count = 0;
1102
1103 while (b < b_max)
1104 count += div_blocks[b++];
1105
1106 if (count)
1107 memset(buf, 0, sizeof(*buf) * count);
1108}
1109
1110
1111/** Decode blocks independently.
1112 */
1113static int decode_blocks_ind(ALSDecContext *ctx, unsigned int ra_frame,
1114 unsigned int c, const unsigned int *div_blocks,
1115 unsigned int *js_blocks)
1116{
1117 int ret;
1118 unsigned int b;
1119 ALSBlockData bd = { 0 };
1120
1121 bd.ra_block = ra_frame;
1122 bd.const_block = ctx->const_block;
1123 bd.shift_lsbs = ctx->shift_lsbs;
1124 bd.opt_order = ctx->opt_order;
1125 bd.store_prev_samples = ctx->store_prev_samples;
1126 bd.use_ltp = ctx->use_ltp;
1127 bd.ltp_lag = ctx->ltp_lag;
1128 bd.ltp_gain = ctx->ltp_gain[0];
1129 bd.quant_cof = ctx->quant_cof[0];
1130 bd.lpc_cof = ctx->lpc_cof[0];
1131 bd.prev_raw_samples = ctx->prev_raw_samples;
1132 bd.raw_samples = ctx->raw_samples[c];
1133
1134
1135 for (b = 0; b < ctx->num_blocks; b++) {
1136 bd.block_length = div_blocks[b];
1137
1138 if ((ret = read_decode_block(ctx, &bd)) < 0) {
1139 // damaged block, write zero for the rest of the frame
1140 zero_remaining(b, ctx->num_blocks, div_blocks, bd.raw_samples);
1141 return ret;
1142 }
1143 bd.raw_samples += div_blocks[b];
1144 bd.ra_block = 0;
1145 }
1146
1147 return 0;
1148}
1149
1150
1151/** Decode blocks dependently.
1152 */
1153static int decode_blocks(ALSDecContext *ctx, unsigned int ra_frame,
1154 unsigned int c, const unsigned int *div_blocks,
1155 unsigned int *js_blocks)
1156{
1157 ALSSpecificConfig *sconf = &ctx->sconf;
1158 unsigned int offset = 0;
1159 unsigned int b;
1160 int ret;
1161 ALSBlockData bd[2] = { { 0 } };
1162
1163 bd[0].ra_block = ra_frame;
1164 bd[0].const_block = ctx->const_block;
1165 bd[0].shift_lsbs = ctx->shift_lsbs;
1166 bd[0].opt_order = ctx->opt_order;
1167 bd[0].store_prev_samples = ctx->store_prev_samples;
1168 bd[0].use_ltp = ctx->use_ltp;
1169 bd[0].ltp_lag = ctx->ltp_lag;
1170 bd[0].ltp_gain = ctx->ltp_gain[0];
1171 bd[0].quant_cof = ctx->quant_cof[0];
1172 bd[0].lpc_cof = ctx->lpc_cof[0];
1173 bd[0].prev_raw_samples = ctx->prev_raw_samples;
1174 bd[0].js_blocks = *js_blocks;
1175
1176 bd[1].ra_block = ra_frame;
1177 bd[1].const_block = ctx->const_block;
1178 bd[1].shift_lsbs = ctx->shift_lsbs;
1179 bd[1].opt_order = ctx->opt_order;
1180 bd[1].store_prev_samples = ctx->store_prev_samples;
1181 bd[1].use_ltp = ctx->use_ltp;
1182 bd[1].ltp_lag = ctx->ltp_lag;
1183 bd[1].ltp_gain = ctx->ltp_gain[0];
1184 bd[1].quant_cof = ctx->quant_cof[0];
1185 bd[1].lpc_cof = ctx->lpc_cof[0];
1186 bd[1].prev_raw_samples = ctx->prev_raw_samples;
1187 bd[1].js_blocks = *(js_blocks + 1);
1188
1189 // decode all blocks
1190 for (b = 0; b < ctx->num_blocks; b++) {
1191 unsigned int s;
1192
1193 bd[0].block_length = div_blocks[b];
1194 bd[1].block_length = div_blocks[b];
1195
1196 bd[0].raw_samples = ctx->raw_samples[c ] + offset;
1197 bd[1].raw_samples = ctx->raw_samples[c + 1] + offset;
1198
1199 bd[0].raw_other = bd[1].raw_samples;
1200 bd[1].raw_other = bd[0].raw_samples;
1201
1202 if ((ret = read_decode_block(ctx, &bd[0])) < 0 ||
1203 (ret = read_decode_block(ctx, &bd[1])) < 0)
1204 goto fail;
1205
1206 // reconstruct joint-stereo blocks
1207 if (bd[0].js_blocks) {
1208 if (bd[1].js_blocks)
1209 av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel pair.\n");
1210
1211 for (s = 0; s < div_blocks[b]; s++)
1212 bd[0].raw_samples[s] = bd[1].raw_samples[s] - (unsigned)bd[0].raw_samples[s];
1213 } else if (bd[1].js_blocks) {
1214 for (s = 0; s < div_blocks[b]; s++)
1215 bd[1].raw_samples[s] = bd[1].raw_samples[s] + (unsigned)bd[0].raw_samples[s];
1216 }
1217
1218 offset += div_blocks[b];
1219 bd[0].ra_block = 0;
1220 bd[1].ra_block = 0;
1221 }
1222
1223 // store carryover raw samples,
1224 // the others channel raw samples are stored by the calling function.
1225 memmove(ctx->raw_samples[c] - sconf->max_order,
1226 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1227 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1228
1229 return 0;
1230fail:
1231 // damaged block, write zero for the rest of the frame
1232 zero_remaining(b, ctx->num_blocks, div_blocks, bd[0].raw_samples);
1233 zero_remaining(b, ctx->num_blocks, div_blocks, bd[1].raw_samples);
1234 return ret;
1235}
1236
1237static inline int als_weighting(GetBitContext *gb, int k, int off)
1238{
1239 int idx = av_clip(decode_rice(gb, k) + off,
1240 0, FF_ARRAY_ELEMS(mcc_weightings) - 1);
1241 return mcc_weightings[idx];
1242}
1243
1244/** Read the channel data.
1245 */
1246static int read_channel_data(ALSDecContext *ctx, ALSChannelData *cd, int c)
1247{
1248 GetBitContext *gb = &ctx->gb;
1249 ALSChannelData *current = cd;
1250 unsigned int channels = ctx->avctx->ch_layout.nb_channels;
1251 int entries = 0;
1252
1253 while (entries < channels && !(current->stop_flag = get_bits1(gb))) {
1254 current->master_channel = get_bits_long(gb, av_ceil_log2(channels));
1255
1256 if (current->master_channel >= channels) {
1257 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid master channel.\n");
1258 return AVERROR_INVALIDDATA;
1259 }
1260
1261 if (current->master_channel != c) {
1262 current->time_diff_flag = get_bits1(gb);
1263 current->weighting[0] = als_weighting(gb, 1, 16);
1264 current->weighting[1] = als_weighting(gb, 2, 14);
1265 current->weighting[2] = als_weighting(gb, 1, 16);
1266
1267 if (current->time_diff_flag) {
1268 current->weighting[3] = als_weighting(gb, 1, 16);
1269 current->weighting[4] = als_weighting(gb, 1, 16);
1270 current->weighting[5] = als_weighting(gb, 1, 16);
1271
1272 current->time_diff_sign = get_bits1(gb);
1273 current->time_diff_index = get_bits(gb, ctx->ltp_lag_length - 3) + 3;
1274 }
1275 }
1276
1277 current++;
1278 entries++;
1279 }
1280
1281 if (entries == channels) {
1282 av_log(ctx->avctx, AV_LOG_ERROR, "Damaged channel data.\n");
1283 return AVERROR_INVALIDDATA;
1284 }
1285
1286 align_get_bits(gb);
1287 return 0;
1288}
1289
1290
1291/** Recursively reverts the inter-channel correlation for a block.
1292 */
1293static int revert_channel_correlation(ALSDecContext *ctx, ALSBlockData *bd,
1294 ALSChannelData **cd, int *reverted,
1295 unsigned int offset, int c)
1296{
1297 ALSChannelData *ch = cd[c];
1298 unsigned int dep = 0;
1299 unsigned int channels = ctx->avctx->ch_layout.nb_channels;
1300 unsigned int channel_size = ctx->sconf.frame_length + ctx->sconf.max_order;
1301
1302 if (reverted[c])
1303 return 0;
1304
1305 reverted[c] = 1;
1306
1307 while (dep < channels && !ch[dep].stop_flag) {
1308 revert_channel_correlation(ctx, bd, cd, reverted, offset,
1309 ch[dep].master_channel);
1310
1311 dep++;
1312 }
1313
1314 if (dep == channels) {
1315 av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel correlation.\n");
1316 return AVERROR_INVALIDDATA;
1317 }
1318
1319 bd->const_block = ctx->const_block + c;
1320 bd->shift_lsbs = ctx->shift_lsbs + c;
1321 bd->opt_order = ctx->opt_order + c;
1322 bd->store_prev_samples = ctx->store_prev_samples + c;
1323 bd->use_ltp = ctx->use_ltp + c;
1324 bd->ltp_lag = ctx->ltp_lag + c;
1325 bd->ltp_gain = ctx->ltp_gain[c];
1326 bd->lpc_cof = ctx->lpc_cof[c];
1327 bd->quant_cof = ctx->quant_cof[c];
1328 bd->raw_samples = ctx->raw_samples[c] + offset;
1329
1330 for (dep = 0; !ch[dep].stop_flag; dep++) {
1331 ptrdiff_t smp;
1332 ptrdiff_t begin = 1;
1333 ptrdiff_t end = bd->block_length - 1;
1334 int64_t y;
1335 int32_t *master = ctx->raw_samples[ch[dep].master_channel] + offset;
1336
1337 if (ch[dep].master_channel == c)
1338 continue;
1339
1340 if (ch[dep].time_diff_flag) {
1341 int t = ch[dep].time_diff_index;
1342
1343 if (ch[dep].time_diff_sign) {
1344 t = -t;
1345 if (begin < t) {
1346 av_log(ctx->avctx, AV_LOG_ERROR, "begin %td smaller than time diff index %d.\n", begin, t);
1347 return AVERROR_INVALIDDATA;
1348 }
1349 begin -= t;
1350 } else {
1351 if (end < t) {
1352 av_log(ctx->avctx, AV_LOG_ERROR, "end %td smaller than time diff index %d.\n", end, t);
1353 return AVERROR_INVALIDDATA;
1354 }
1355 end -= t;
1356 }
1357
1358 if (FFMIN(begin - 1, begin - 1 + t) < ctx->raw_buffer - master ||
1359 FFMAX(end + 1, end + 1 + t) > ctx->raw_buffer + channels * channel_size - master) {
1360 av_log(ctx->avctx, AV_LOG_ERROR,
1361 "sample pointer range [%p, %p] not contained in raw_buffer [%p, %p].\n",
1362 master + FFMIN(begin - 1, begin - 1 + t), master + FFMAX(end + 1, end + 1 + t),
1363 ctx->raw_buffer, ctx->raw_buffer + channels * channel_size);
1364 return AVERROR_INVALIDDATA;
1365 }
1366
1367 for (smp = begin; smp < end; smp++) {
1368 y = (1 << 6) +
1369 MUL64(ch[dep].weighting[0], master[smp - 1 ]) +
1370 MUL64(ch[dep].weighting[1], master[smp ]) +
1371 MUL64(ch[dep].weighting[2], master[smp + 1 ]) +
1372 MUL64(ch[dep].weighting[3], master[smp - 1 + t]) +
1373 MUL64(ch[dep].weighting[4], master[smp + t]) +
1374 MUL64(ch[dep].weighting[5], master[smp + 1 + t]);
1375
1376 bd->raw_samples[smp] += y >> 7;
1377 }
1378 } else {
1379
1380 if (begin - 1 < ctx->raw_buffer - master ||
1381 end + 1 > ctx->raw_buffer + channels * channel_size - master) {
1382 av_log(ctx->avctx, AV_LOG_ERROR,
1383 "sample pointer range [%p, %p] not contained in raw_buffer [%p, %p].\n",
1384 master + begin - 1, master + end + 1,
1385 ctx->raw_buffer, ctx->raw_buffer + channels * channel_size);
1386 return AVERROR_INVALIDDATA;
1387 }
1388
1389 for (smp = begin; smp < end; smp++) {
1390 y = (1 << 6) +
1391 MUL64(ch[dep].weighting[0], master[smp - 1]) +
1392 MUL64(ch[dep].weighting[1], master[smp ]) +
1393 MUL64(ch[dep].weighting[2], master[smp + 1]);
1394
1395 bd->raw_samples[smp] += y >> 7;
1396 }
1397 }
1398 }
1399
1400 return 0;
1401}
1402
1403
1404/** multiply two softfloats and handle the rounding off
1405 */
1406static SoftFloat_IEEE754 multiply(SoftFloat_IEEE754 a, SoftFloat_IEEE754 b) {
1407 uint64_t mantissa_temp;
1408 uint64_t mask_64;
1409 int cutoff_bit_count;
1410 unsigned char last_2_bits;
1411 unsigned int mantissa;
1412 int32_t sign;
1413 uint32_t return_val = 0;
1414 int bit_count = 48;
1415
1416 sign = a.sign ^ b.sign;
1417
1418 // Multiply mantissa bits in a 64-bit register
1419 mantissa_temp = (uint64_t)a.mant * (uint64_t)b.mant;
1420 mask_64 = (uint64_t)0x1 << 47;
1421
1422 if (!mantissa_temp)
1423 return FLOAT_0;
1424
1425 // Count the valid bit count
1426 while (!(mantissa_temp & mask_64) && mask_64) {
1427 bit_count--;
1428 mask_64 >>= 1;
1429 }
1430
1431 // Round off
1432 cutoff_bit_count = bit_count - 24;
1433 if (cutoff_bit_count > 0) {
1434 last_2_bits = (unsigned char)(((unsigned int)mantissa_temp >> (cutoff_bit_count - 1)) & 0x3 );
1435 if ((last_2_bits == 0x3) || ((last_2_bits == 0x1) && ((unsigned int)mantissa_temp & ((0x1UL << (cutoff_bit_count - 1)) - 1)))) {
1436 // Need to round up
1437 mantissa_temp += (uint64_t)0x1 << cutoff_bit_count;
1438 }
1439 }
1440
1441 if (cutoff_bit_count >= 0) {
1442 mantissa = (unsigned int)(mantissa_temp >> cutoff_bit_count);
1443 } else {
1444 mantissa = (unsigned int)(mantissa_temp <<-cutoff_bit_count);
1445 }
1446
1447 // Need one more shift?
1448 if (mantissa & 0x01000000ul) {
1449 bit_count++;
1450 mantissa >>= 1;
1451 }
1452
1453 if (!sign) {
1454 return_val = 0x80000000U;
1455 }
1456
1457 return_val |= ((unsigned)av_clip(a.exp + b.exp + bit_count - 47, -126, 127) << 23) & 0x7F800000;
1458 return_val |= mantissa;
1459 return av_bits2sf_ieee754(return_val);
1460}
1461
1462
1463/** Read and decode the floating point sample data
1464 */
1465static int read_diff_float_data(ALSDecContext *ctx, unsigned int ra_frame) {
1466 AVCodecContext *avctx = ctx->avctx;
1467 GetBitContext *gb = &ctx->gb;
1468 SoftFloat_IEEE754 *acf = ctx->acf;
1469 int *shift_value = ctx->shift_value;
1470 int *last_shift_value = ctx->last_shift_value;
1471 int *last_acf_mantissa = ctx->last_acf_mantissa;
1472 int **raw_mantissa = ctx->raw_mantissa;
1473 int *nbits = ctx->nbits;
1474 unsigned char *larray = ctx->larray;
1475 int frame_length = ctx->cur_frame_length;
1476 SoftFloat_IEEE754 scale = av_int2sf_ieee754(0x1u, 23);
1477 unsigned int partA_flag;
1478 unsigned int highest_byte;
1479 unsigned int shift_amp;
1480 uint32_t tmp_32;
1481 int use_acf;
1482 int nchars;
1483 int i;
1484 int c;
1485 long k;
1486 long nbits_aligned;
1487 unsigned long acc;
1488 unsigned long j;
1489 uint32_t sign;
1490 uint32_t e;
1491 uint32_t mantissa;
1492
1493 skip_bits_long(gb, 32); //num_bytes_diff_float
1494 use_acf = get_bits1(gb);
1495
1496 if (ra_frame) {
1497 memset(last_acf_mantissa, 0, avctx->ch_layout.nb_channels * sizeof(*last_acf_mantissa));
1498 memset(last_shift_value, 0, avctx->ch_layout.nb_channels * sizeof(*last_shift_value) );
1499 ff_mlz_flush_dict(ctx->mlz);
1500 }
1501
1502 if (avctx->ch_layout.nb_channels * 8 > get_bits_left(gb))
1503 return AVERROR_INVALIDDATA;
1504
1505 for (c = 0; c < avctx->ch_layout.nb_channels; ++c) {
1506 if (use_acf) {
1507 //acf_flag
1508 if (get_bits1(gb)) {
1509 tmp_32 = get_bits(gb, 23);
1510 last_acf_mantissa[c] = tmp_32;
1511 } else {
1512 tmp_32 = last_acf_mantissa[c];
1513 }
1514 acf[c] = av_bits2sf_ieee754(tmp_32);
1515 } else {
1516 acf[c] = FLOAT_1;
1517 }
1518
1519 highest_byte = get_bits(gb, 2);
1520 partA_flag = get_bits1(gb);
1521 shift_amp = get_bits1(gb);
1522
1523 if (shift_amp) {
1524 shift_value[c] = get_bits(gb, 8);
1525 last_shift_value[c] = shift_value[c];
1526 } else {
1527 shift_value[c] = last_shift_value[c];
1528 }
1529
1530 if (partA_flag) {
1531 if (!get_bits1(gb)) { //uncompressed
1532 for (i = 0; i < frame_length; ++i) {
1533 if (ctx->raw_samples[c][i] == 0) {
1534 ctx->raw_mantissa[c][i] = get_bits_long(gb, 32);
1535 }
1536 }
1537 } else { //compressed
1538 nchars = 0;
1539 for (i = 0; i < frame_length; ++i) {
1540 if (ctx->raw_samples[c][i] == 0) {
1541 nchars += 4;
1542 }
1543 }
1544
1545 tmp_32 = ff_mlz_decompression(ctx->mlz, gb, nchars, larray);
1546 if(tmp_32 != nchars) {
1547 av_log(ctx->avctx, AV_LOG_ERROR, "Error in MLZ decompression (%"PRId32", %d).\n", tmp_32, nchars);
1548 return AVERROR_INVALIDDATA;
1549 }
1550
1551 j = 0;
1552 for (i = 0; i < frame_length; ++i) {
1553 if (ctx->raw_samples[c][i] == 0) {
1554 ctx->raw_mantissa[c][i] = AV_RB32(larray + j);
1555 j += 4;
1556 }
1557 }
1558 }
1559 }
1560
1561 //decode part B
1562 if (highest_byte) {
1563 for (i = 0; i < frame_length; ++i) {
1564 if (ctx->raw_samples[c][i] != 0) {
1565 //The following logic is taken from Table 14.45 and 14.46 from the ISO spec
1566 if (av_cmp_sf_ieee754(acf[c], FLOAT_1)) {
1567 int nbit = av_log2(FFABSU(ctx->raw_samples[c][i]));
1568 if (nbit > 23)
1569 return AVERROR_INVALIDDATA;
1570 nbits[i] = 23 - nbit;
1571 } else {
1572 nbits[i] = 23;
1573 }
1574 nbits[i] = FFMIN(nbits[i], highest_byte*8);
1575 }
1576 }
1577
1578 if (!get_bits1(gb)) { //uncompressed
1579 for (i = 0; i < frame_length; ++i) {
1580 if (ctx->raw_samples[c][i] != 0) {
1581 raw_mantissa[c][i] = get_bitsz(gb, nbits[i]);
1582 }
1583 }
1584 } else { //compressed
1585 nchars = 0;
1586 for (i = 0; i < frame_length; ++i) {
1587 if (ctx->raw_samples[c][i]) {
1588 nchars += (int) nbits[i] / 8;
1589 if (nbits[i] & 7) {
1590 ++nchars;
1591 }
1592 }
1593 }
1594
1595 tmp_32 = ff_mlz_decompression(ctx->mlz, gb, nchars, larray);
1596 if(tmp_32 != nchars) {
1597 av_log(ctx->avctx, AV_LOG_ERROR, "Error in MLZ decompression (%"PRId32", %d).\n", tmp_32, nchars);
1598 return AVERROR_INVALIDDATA;
1599 }
1600
1601 j = 0;
1602 for (i = 0; i < frame_length; ++i) {
1603 if (ctx->raw_samples[c][i]) {
1604 if (nbits[i] & 7) {
1605 nbits_aligned = 8 * ((unsigned int)(nbits[i] / 8) + 1);
1606 } else {
1607 nbits_aligned = nbits[i];
1608 }
1609 acc = 0;
1610 for (k = 0; k < nbits_aligned/8; ++k) {
1611 acc = (acc << 8) + larray[j++];
1612 }
1613 acc >>= (nbits_aligned - nbits[i]);
1614 raw_mantissa[c][i] = acc;
1615 }
1616 }
1617 }
1618 }
1619
1620 for (i = 0; i < frame_length; ++i) {
1621 SoftFloat_IEEE754 pcm_sf = av_int2sf_ieee754(ctx->raw_samples[c][i], 0);
1622 pcm_sf = av_div_sf_ieee754(pcm_sf, scale);
1623
1624 if (ctx->raw_samples[c][i] != 0) {
1625 if (!av_cmp_sf_ieee754(acf[c], FLOAT_1)) {
1626 pcm_sf = multiply(acf[c], pcm_sf);
1627 }
1628
1629 sign = pcm_sf.sign;
1630 e = pcm_sf.exp;
1631 mantissa = (pcm_sf.mant | 0x800000) + raw_mantissa[c][i];
1632
1633 while(mantissa >= 0x1000000) {
1634 e++;
1635 mantissa >>= 1;
1636 }
1637
1638 if (mantissa) e += (shift_value[c] - 127);
1639 mantissa &= 0x007fffffUL;
1640
1641 tmp_32 = (sign << 31) | ((e + EXP_BIAS) << 23) | (mantissa);
1642 ctx->raw_samples[c][i] = tmp_32;
1643 } else {
1644 ctx->raw_samples[c][i] = raw_mantissa[c][i];
1645 }
1646 }
1647 align_get_bits(gb);
1648 }
1649 return 0;
1650}
1651
1652
1653/** Read the frame data.
1654 */
1655static int read_frame_data(ALSDecContext *ctx, unsigned int ra_frame)
1656{
1657 ALSSpecificConfig *sconf = &ctx->sconf;
1658 AVCodecContext *avctx = ctx->avctx;
1659 GetBitContext *gb = &ctx->gb;
1660 unsigned int div_blocks[32]; ///< block sizes.
1661 int c;
1662 unsigned int js_blocks[2];
1663 int channels = avctx->ch_layout.nb_channels;
1664 uint32_t bs_info = 0;
1665 int ret;
1666
1667 // skip the size of the ra unit if present in the frame
1668 if (sconf->ra_flag == RA_FLAG_FRAMES && ra_frame)
1669 skip_bits_long(gb, 32);
1670
1671 if (sconf->mc_coding && sconf->joint_stereo) {
1672 ctx->js_switch = get_bits1(gb);
1673 align_get_bits(gb);
1674 }
1675
1676 if (!sconf->mc_coding || ctx->js_switch) {
1677 int independent_bs = !sconf->joint_stereo;
1678 if (get_bits_left(gb) < 7*channels*ctx->num_blocks)
1679 return AVERROR_INVALIDDATA;
1680 for (c = 0; c < channels; c++) {
1681 js_blocks[0] = 0;
1682 js_blocks[1] = 0;
1683
1684 get_block_sizes(ctx, div_blocks, &bs_info);
1685
1686 // if joint_stereo and block_switching is set, independent decoding
1687 // is signaled via the first bit of bs_info
1688 if (sconf->joint_stereo && sconf->block_switching)
1689 if (bs_info >> 31)
1690 independent_bs = 2;
1691
1692 // if this is the last channel, it has to be decoded independently
1693 if (c == channels - 1 || (c & 1))
1694 independent_bs = 1;
1695
1696 if (independent_bs) {
1697 ret = decode_blocks_ind(ctx, ra_frame, c,
1698 div_blocks, js_blocks);
1699 if (ret < 0)
1700 return ret;
1701 independent_bs--;
1702 } else {
1703 ret = decode_blocks(ctx, ra_frame, c, div_blocks, js_blocks);
1704 if (ret < 0)
1705 return ret;
1706
1707 c++;
1708 }
1709
1710 // store carryover raw samples
1711 memmove(ctx->raw_samples[c] - sconf->max_order,
1712 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1713 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1714 ctx->highest_decoded_channel = c;
1715 }
1716 } else { // multi-channel coding
1717 ALSBlockData bd = { 0 };
1718 int b, ret;
1719 int *reverted_channels = ctx->reverted_channels;
1720 unsigned int offset = 0;
1721
1722 for (c = 0; c < channels; c++)
1723 if (ctx->chan_data[c] < ctx->chan_data_buffer) {
1724 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid channel data.\n");
1725 return AVERROR_INVALIDDATA;
1726 }
1727
1728 memset(reverted_channels, 0, sizeof(*reverted_channels) * channels);
1729
1730 bd.ra_block = ra_frame;
1731 bd.prev_raw_samples = ctx->prev_raw_samples;
1732
1733 get_block_sizes(ctx, div_blocks, &bs_info);
1734
1735 for (b = 0; b < ctx->num_blocks; b++) {
1736 bd.block_length = div_blocks[b];
1737 if (bd.block_length <= 0) {
1738 av_log(ctx->avctx, AV_LOG_WARNING,
1739 "Invalid block length %u in channel data!\n",
1740 bd.block_length);
1741 continue;
1742 }
1743
1744 for (c = 0; c < channels; c++) {
1745 bd.const_block = ctx->const_block + c;
1746 bd.shift_lsbs = ctx->shift_lsbs + c;
1747 bd.opt_order = ctx->opt_order + c;
1748 bd.store_prev_samples = ctx->store_prev_samples + c;
1749 bd.use_ltp = ctx->use_ltp + c;
1750 bd.ltp_lag = ctx->ltp_lag + c;
1751 bd.ltp_gain = ctx->ltp_gain[c];
1752 bd.lpc_cof = ctx->lpc_cof[c];
1753 bd.quant_cof = ctx->quant_cof[c];
1754 bd.raw_samples = ctx->raw_samples[c] + offset;
1755 bd.raw_other = NULL;
1756
1757 if ((ret = read_block(ctx, &bd)) < 0)
1758 return ret;
1759 if ((ret = read_channel_data(ctx, ctx->chan_data[c], c)) < 0)
1760 return ret;
1761 }
1762
1763 for (c = 0; c < channels; c++) {
1764 ret = revert_channel_correlation(ctx, &bd, ctx->chan_data,
1765 reverted_channels, offset, c);
1766 if (ret < 0)
1767 return ret;
1768 }
1769 for (c = 0; c < channels; c++) {
1770 bd.const_block = ctx->const_block + c;
1771 bd.shift_lsbs = ctx->shift_lsbs + c;
1772 bd.opt_order = ctx->opt_order + c;
1773 bd.store_prev_samples = ctx->store_prev_samples + c;
1774 bd.use_ltp = ctx->use_ltp + c;
1775 bd.ltp_lag = ctx->ltp_lag + c;
1776 bd.ltp_gain = ctx->ltp_gain[c];
1777 bd.lpc_cof = ctx->lpc_cof[c];
1778 bd.quant_cof = ctx->quant_cof[c];
1779 bd.raw_samples = ctx->raw_samples[c] + offset;
1780
1781 if ((ret = decode_block(ctx, &bd)) < 0)
1782 return ret;
1783
1784 ctx->highest_decoded_channel = FFMAX(ctx->highest_decoded_channel, c);
1785 }
1786
1787 memset(reverted_channels, 0, channels * sizeof(*reverted_channels));
1788 offset += div_blocks[b];
1789 bd.ra_block = 0;
1790 }
1791
1792 // store carryover raw samples
1793 for (c = 0; c < channels; c++)
1794 memmove(ctx->raw_samples[c] - sconf->max_order,
1795 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1796 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1797 }
1798
1799 if (sconf->floating) {
1800 ret = read_diff_float_data(ctx, ra_frame);
1801 if (ret < 0)
1802 return ret;
1803 }
1804
1805 if (get_bits_left(gb) < 0) {
1806 av_log(ctx->avctx, AV_LOG_ERROR, "Overread %d\n", -get_bits_left(gb));
1807 return AVERROR_INVALIDDATA;
1808 }
1809
1810 return 0;
1811}
1812
1813
1814/** Decode an ALS frame.
1815 */
1816static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
1817 int *got_frame_ptr, AVPacket *avpkt)
1818{
1819 ALSDecContext *ctx = avctx->priv_data;
1820 ALSSpecificConfig *sconf = &ctx->sconf;
1821 const uint8_t *buffer = avpkt->data;
1822 int buffer_size = avpkt->size;
1823 int invalid_frame, ret;
1824 int channels = avctx->ch_layout.nb_channels;
1825 unsigned int c, sample, ra_frame, bytes_read, shift;
1826
1827 if ((ret = init_get_bits8(&ctx->gb, buffer, buffer_size)) < 0)
1828 return ret;
1829
1830 // In the case that the distance between random access frames is set to zero
1831 // (sconf->ra_distance == 0) no frame is treated as a random access frame.
1832 // For the first frame, if prediction is used, all samples used from the
1833 // previous frame are assumed to be zero.
1834 ra_frame = sconf->ra_distance && !(ctx->frame_id % sconf->ra_distance);
1835
1836 // the last frame to decode might have a different length
1837 if (sconf->samples != 0xFFFFFFFF)
1838 ctx->cur_frame_length = FFMIN(sconf->samples - ctx->frame_id * (uint64_t) sconf->frame_length,
1839 sconf->frame_length);
1840 else
1841 ctx->cur_frame_length = sconf->frame_length;
1842
1843 ctx->highest_decoded_channel = -1;
1844 // decode the frame data
1845 if ((invalid_frame = read_frame_data(ctx, ra_frame)) < 0)
1846 av_log(ctx->avctx, AV_LOG_WARNING,
1847 "Reading frame data failed. Skipping RA unit.\n");
1848
1849 if (ctx->highest_decoded_channel == -1) {
1850 av_log(ctx->avctx, AV_LOG_WARNING,
1851 "No channel data decoded.\n");
1852 return AVERROR_INVALIDDATA;
1853 }
1854
1855 ctx->frame_id++;
1856
1857 /* get output buffer */
1858 frame->nb_samples = ctx->cur_frame_length;
1859 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
1860 return ret;
1861
1862 // transform decoded frame into output format
1863 #define INTERLEAVE_OUTPUT(bps) \
1864 { \
1865 int##bps##_t *dest = (int##bps##_t*)frame->data[0]; \
1866 int32_t *raw_samples = ctx->raw_samples[0]; \
1867 int raw_step = channels > 1 ? ctx->raw_samples[1] - raw_samples : 1; \
1868 shift = bps - ctx->avctx->bits_per_raw_sample; \
1869 if (!ctx->cs_switch) { \
1870 for (sample = 0; sample < ctx->cur_frame_length; sample++) \
1871 for (c = 0; c < channels; c++) \
1872 *dest++ = raw_samples[c*raw_step + sample] * (1U << shift); \
1873 } else { \
1874 for (sample = 0; sample < ctx->cur_frame_length; sample++) \
1875 for (c = 0; c < channels; c++) \
1876 *dest++ = raw_samples[sconf->chan_pos[c]*raw_step + sample] * (1U << shift);\
1877 } \
1878 }
1879
1880 if (ctx->avctx->bits_per_raw_sample <= 16) {
1881 INTERLEAVE_OUTPUT(16)
1882 } else {
1883 INTERLEAVE_OUTPUT(32)
1884 }
1885
1886 // update CRC
1887 if (sconf->crc_enabled && (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL))) {
1888 int swap = HAVE_BIGENDIAN != sconf->msb_first;
1889
1890 if (ctx->avctx->bits_per_raw_sample == 24) {
1891 int32_t *src = (int32_t *)frame->data[0];
1892
1893 for (sample = 0;
1894 sample < ctx->cur_frame_length * channels;
1895 sample++) {
1896 int32_t v;
1897
1898 if (swap)
1899 v = av_bswap32(src[sample]);
1900 else
1901 v = src[sample];
1902 if (!HAVE_BIGENDIAN)
1903 v >>= 8;
1904
1905 ctx->crc = av_crc(ctx->crc_table, ctx->crc, (uint8_t*)(&v), 3);
1906 }
1907 } else {
1908 uint8_t *crc_source;
1909
1910 if (swap) {
1911 if (ctx->avctx->bits_per_raw_sample <= 16) {
1912 int16_t *src = (int16_t*) frame->data[0];
1913 int16_t *dest = (int16_t*) ctx->crc_buffer;
1914 for (sample = 0;
1915 sample < ctx->cur_frame_length * channels;
1916 sample++)
1917 *dest++ = av_bswap16(src[sample]);
1918 } else {
1919 ctx->bdsp.bswap_buf((uint32_t *) ctx->crc_buffer,
1920 (uint32_t *) frame->data[0],
1921 ctx->cur_frame_length * channels);
1922 }
1923 crc_source = ctx->crc_buffer;
1924 } else {
1925 crc_source = frame->data[0];
1926 }
1927
1928 ctx->crc = av_crc(ctx->crc_table, ctx->crc, crc_source,
1929 ctx->cur_frame_length * channels *
1930 av_get_bytes_per_sample(avctx->sample_fmt));
1931 }
1932
1933
1934 // check CRC sums if this is the last frame
1935 if (ctx->cur_frame_length != sconf->frame_length &&
1936 ctx->crc_org != ctx->crc) {
1937 av_log(avctx, AV_LOG_ERROR, "CRC error.\n");
1938 if (avctx->err_recognition & AV_EF_EXPLODE)
1939 return AVERROR_INVALIDDATA;
1940 }
1941 }
1942
1943 *got_frame_ptr = 1;
1944
1945 bytes_read = invalid_frame ? buffer_size :
1946 (get_bits_count(&ctx->gb) + 7) >> 3;
1947
1948 return bytes_read;
1949}
1950
1951
1952/** Uninitialize the ALS decoder.
1953 */
1954static av_cold int decode_end(AVCodecContext *avctx)
1955{
1956 ALSDecContext *ctx = avctx->priv_data;
1957 int i;
1958
1959 av_freep(&ctx->sconf.chan_pos);
1960
1961 ff_bgmc_end(&ctx->bgmc_lut, &ctx->bgmc_lut_status);
1962
1963 av_freep(&ctx->const_block);
1964 av_freep(&ctx->shift_lsbs);
1965 av_freep(&ctx->opt_order);
1966 av_freep(&ctx->store_prev_samples);
1967 av_freep(&ctx->use_ltp);
1968 av_freep(&ctx->ltp_lag);
1969 av_freep(&ctx->ltp_gain);
1970 av_freep(&ctx->ltp_gain_buffer);
1971 av_freep(&ctx->quant_cof);
1972 av_freep(&ctx->lpc_cof);
1973 av_freep(&ctx->quant_cof_buffer);
1974 av_freep(&ctx->lpc_cof_buffer);
1975 av_freep(&ctx->lpc_cof_reversed_buffer);
1976 av_freep(&ctx->prev_raw_samples);
1977 av_freep(&ctx->raw_samples);
1978 av_freep(&ctx->raw_buffer);
1979 av_freep(&ctx->chan_data);
1980 av_freep(&ctx->chan_data_buffer);
1981 av_freep(&ctx->reverted_channels);
1982 av_freep(&ctx->crc_buffer);
1983 if (ctx->mlz) {
1984 av_freep(&ctx->mlz->dict);
1985 av_freep(&ctx->mlz);
1986 }
1987 av_freep(&ctx->acf);
1988 av_freep(&ctx->last_acf_mantissa);
1989 av_freep(&ctx->shift_value);
1990 av_freep(&ctx->last_shift_value);
1991 if (ctx->raw_mantissa) {
1992 for (i = 0; i < avctx->ch_layout.nb_channels; i++) {
1993 av_freep(&ctx->raw_mantissa[i]);
1994 }
1995 av_freep(&ctx->raw_mantissa);
1996 }
1997 av_freep(&ctx->larray);
1998 av_freep(&ctx->nbits);
1999
2000 return 0;
2001}
2002
2003
2004/** Initialize the ALS decoder.
2005 */
2006static av_cold int decode_init(AVCodecContext *avctx)
2007{
2008 unsigned int c;
2009 unsigned int channel_size;
2010 int num_buffers, ret;
2011 int channels;
2012 ALSDecContext *ctx = avctx->priv_data;
2013 ALSSpecificConfig *sconf = &ctx->sconf;
2014 ctx->avctx = avctx;
2015
2016 if (!avctx->extradata) {
2017 av_log(avctx, AV_LOG_ERROR, "Missing required ALS extradata.\n");
2018 return AVERROR_INVALIDDATA;
2019 }
2020
2021 if ((ret = read_specific_config(ctx)) < 0) {
2022 av_log(avctx, AV_LOG_ERROR, "Reading ALSSpecificConfig failed.\n");
2023 return ret;
2024 }
2025 channels = avctx->ch_layout.nb_channels;
2026
2027 if ((ret = check_specific_config(ctx)) < 0) {
2028 return ret;
2029 }
2030
2031 if (sconf->bgmc) {
2032 ret = ff_bgmc_init(avctx, &ctx->bgmc_lut, &ctx->bgmc_lut_status);
2033 if (ret < 0)
2034 return ret;
2035 }
2036 if (sconf->floating) {
2037 avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
2038 avctx->bits_per_raw_sample = 32;
2039 } else {
2040 avctx->sample_fmt = sconf->resolution > 1
2041 ? AV_SAMPLE_FMT_S32 : AV_SAMPLE_FMT_S16;
2042 avctx->bits_per_raw_sample = (sconf->resolution + 1) * 8;
2043 if (avctx->bits_per_raw_sample > 32) {
2044 av_log(avctx, AV_LOG_ERROR, "Bits per raw sample %d larger than 32.\n",
2045 avctx->bits_per_raw_sample);
2046 return AVERROR_INVALIDDATA;
2047 }
2048 }
2049
2050 // set maximum Rice parameter for progressive decoding based on resolution
2051 // This is not specified in 14496-3 but actually done by the reference
2052 // codec RM22 revision 2.
2053 ctx->s_max = sconf->resolution > 1 ? 31 : 15;
2054
2055 // set lag value for long-term prediction
2056 ctx->ltp_lag_length = 8 + (avctx->sample_rate >= 96000) +
2057 (avctx->sample_rate >= 192000);
2058
2059 // allocate quantized parcor coefficient buffer
2060 num_buffers = sconf->mc_coding ? channels : 1;
2061 if (num_buffers * (uint64_t)num_buffers > INT_MAX) // protect chan_data_buffer allocation
2062 return AVERROR_INVALIDDATA;
2063
2064 ctx->quant_cof = av_malloc_array(num_buffers, sizeof(*ctx->quant_cof));
2065 ctx->lpc_cof = av_malloc_array(num_buffers, sizeof(*ctx->lpc_cof));
2066 ctx->quant_cof_buffer = av_malloc_array(num_buffers * sconf->max_order,
2067 sizeof(*ctx->quant_cof_buffer));
2068 ctx->lpc_cof_buffer = av_malloc_array(num_buffers * sconf->max_order,
2069 sizeof(*ctx->lpc_cof_buffer));
2070 ctx->lpc_cof_reversed_buffer = av_malloc_array(sconf->max_order,
2071 sizeof(*ctx->lpc_cof_buffer));
2072
2073 if (!ctx->quant_cof || !ctx->lpc_cof ||
2074 !ctx->quant_cof_buffer || !ctx->lpc_cof_buffer ||
2075 !ctx->lpc_cof_reversed_buffer) {
2076 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2077 return AVERROR(ENOMEM);
2078 }
2079
2080 // assign quantized parcor coefficient buffers
2081 for (c = 0; c < num_buffers; c++) {
2082 ctx->quant_cof[c] = ctx->quant_cof_buffer + c * sconf->max_order;
2083 ctx->lpc_cof[c] = ctx->lpc_cof_buffer + c * sconf->max_order;
2084 }
2085
2086 // allocate and assign lag and gain data buffer for ltp mode
2087 ctx->const_block = av_malloc_array(num_buffers, sizeof(*ctx->const_block));
2088 ctx->shift_lsbs = av_malloc_array(num_buffers, sizeof(*ctx->shift_lsbs));
2089 ctx->opt_order = av_malloc_array(num_buffers, sizeof(*ctx->opt_order));
2090 ctx->store_prev_samples = av_malloc_array(num_buffers, sizeof(*ctx->store_prev_samples));
2091 ctx->use_ltp = av_calloc(num_buffers, sizeof(*ctx->use_ltp));
2092 ctx->ltp_lag = av_malloc_array(num_buffers, sizeof(*ctx->ltp_lag));
2093 ctx->ltp_gain = av_malloc_array(num_buffers, sizeof(*ctx->ltp_gain));
2094 ctx->ltp_gain_buffer = av_malloc_array(num_buffers * 5, sizeof(*ctx->ltp_gain_buffer));
2095
2096 if (!ctx->const_block || !ctx->shift_lsbs ||
2097 !ctx->opt_order || !ctx->store_prev_samples ||
2098 !ctx->use_ltp || !ctx->ltp_lag ||
2099 !ctx->ltp_gain || !ctx->ltp_gain_buffer) {
2100 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2101 return AVERROR(ENOMEM);
2102 }
2103
2104 for (c = 0; c < num_buffers; c++)
2105 ctx->ltp_gain[c] = ctx->ltp_gain_buffer + c * 5;
2106
2107 // allocate and assign channel data buffer for mcc mode
2108 if (sconf->mc_coding) {
2109 ctx->chan_data_buffer = av_calloc(num_buffers * num_buffers,
2110 sizeof(*ctx->chan_data_buffer));
2111 ctx->chan_data = av_calloc(num_buffers, sizeof(*ctx->chan_data));
2112 ctx->reverted_channels = av_malloc_array(num_buffers,
2113 sizeof(*ctx->reverted_channels));
2114
2115 if (!ctx->chan_data_buffer || !ctx->chan_data || !ctx->reverted_channels) {
2116 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2117 return AVERROR(ENOMEM);
2118 }
2119
2120 for (c = 0; c < num_buffers; c++)
2121 ctx->chan_data[c] = ctx->chan_data_buffer + c * num_buffers;
2122 } else {
2123 ctx->chan_data = NULL;
2124 ctx->chan_data_buffer = NULL;
2125 ctx->reverted_channels = NULL;
2126 }
2127
2128 if (sconf->floating) {
2129 ctx->acf = av_malloc_array(channels, sizeof(*ctx->acf));
2130 ctx->shift_value = av_calloc(channels, sizeof(*ctx->shift_value));
2131 ctx->last_shift_value = av_calloc(channels, sizeof(*ctx->last_shift_value));
2132 ctx->last_acf_mantissa = av_calloc(channels, sizeof(*ctx->last_acf_mantissa));
2133 ctx->raw_mantissa = av_calloc(channels, sizeof(*ctx->raw_mantissa));
2134
2135 ctx->larray = av_malloc_array(ctx->cur_frame_length * 4, sizeof(*ctx->larray));
2136 ctx->nbits = av_malloc_array(ctx->cur_frame_length, sizeof(*ctx->nbits));
2137 ctx->mlz = av_mallocz(sizeof(*ctx->mlz));
2138
2139 if (!ctx->larray || !ctx->nbits || !ctx->mlz || !ctx->acf || !ctx->shift_value
2140 || !ctx->last_shift_value || !ctx->last_acf_mantissa || !ctx->raw_mantissa) {
2141 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2142 return AVERROR(ENOMEM);
2143 }
2144
2145 ret = ff_mlz_init_dict(avctx, ctx->mlz);
2146 if (ret < 0)
2147 return ret;
2148 ff_mlz_flush_dict(ctx->mlz);
2149
2150 for (c = 0; c < channels; ++c) {
2151 ctx->raw_mantissa[c] = av_calloc(ctx->cur_frame_length, sizeof(**ctx->raw_mantissa));
2152 if (!ctx->raw_mantissa[c]) {
2153 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2154 return AVERROR(ENOMEM);
2155 }
2156 }
2157 }
2158
2159 channel_size = sconf->frame_length + sconf->max_order;
2160
2161 // allocate previous raw sample buffer
2162 ctx->prev_raw_samples = av_malloc_array(sconf->max_order, sizeof(*ctx->prev_raw_samples));
2163 ctx->raw_buffer = av_calloc(channels * channel_size, sizeof(*ctx->raw_buffer));
2164 ctx->raw_samples = av_malloc_array(channels, sizeof(*ctx->raw_samples));
2165 if (!ctx->prev_raw_samples || !ctx->raw_buffer|| !ctx->raw_samples) {
2166 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2167 return AVERROR(ENOMEM);
2168 }
2169
2170 // assign raw samples buffers
2171 ctx->raw_samples[0] = ctx->raw_buffer + sconf->max_order;
2172 for (c = 1; c < channels; c++)
2173 ctx->raw_samples[c] = ctx->raw_samples[c - 1] + channel_size;
2174
2175 // allocate crc buffer
2176 if (HAVE_BIGENDIAN != sconf->msb_first && sconf->crc_enabled &&
2177 (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL))) {
2178 ctx->crc_buffer = av_malloc_array(ctx->cur_frame_length *
2179 channels *
2180 av_get_bytes_per_sample(avctx->sample_fmt),
2181 sizeof(*ctx->crc_buffer));
2182 if (!ctx->crc_buffer) {
2183 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2184 return AVERROR(ENOMEM);
2185 }
2186 }
2187
2188 ff_bswapdsp_init(&ctx->bdsp);
2189
2190 return 0;
2191}
2192
2193
2194/** Flush (reset) the frame ID after seeking.
2195 */
2196static av_cold void flush(AVCodecContext *avctx)
2197{
2198 ALSDecContext *ctx = avctx->priv_data;
2199
2200 ctx->frame_id = 0;
2201}
2202
2203static const AVOption options[] = {
2204 { "max_order", "Sets the maximum order (ALS simple profile allows max 15)", offsetof(ALSDecContext, user_max_order), AV_OPT_TYPE_INT, { .i64 = 1023 }, 0, 1023, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_DECODING_PARAM },
2205 { NULL }
2206};
2207
2208static const AVClass als_class = {
2209 .class_name = "als",
2210 .item_name = av_default_item_name,
2211 .option = options,
2212 .version = LIBAVUTIL_VERSION_INT,
2213};
2214
2215const FFCodec ff_als_decoder = {
2216 .p.name = "als",
2217 CODEC_LONG_NAME("MPEG-4 Audio Lossless Coding (ALS)"),
2218 .p.type = AVMEDIA_TYPE_AUDIO,
2219 .p.id = AV_CODEC_ID_MP4ALS,
2220 .priv_data_size = sizeof(ALSDecContext),
2221 .init = decode_init,
2222 .close = decode_end,
2223 FF_CODEC_DECODE_CB(decode_frame),
2224 .p.priv_class = &als_class,
2225 .flush = flush,
2226 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
2227 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
2228};
dst
uint8_t ptrdiff_t const uint8_t ptrdiff_t int intptr_t intptr_t int int16_t * dst
Definition dsp.h:87
val
static double val(void *priv, double ch)
Definition aeval.c:77
ff_als_decoder
const FFCodec ff_als_decoder
Definition alsdec.c:2215
read_channel_data
static int read_channel_data(ALSDecContext *ctx, ALSChannelData *cd, int c)
Read the channel data.
Definition alsdec.c:1246
decode_blocks
static int decode_blocks(ALSDecContext *ctx, unsigned int ra_frame, unsigned int c, const unsigned int *div_blocks, unsigned int *js_blocks)
Decode blocks dependently.
Definition alsdec.c:1153
read_specific_config
static av_cold int read_specific_config(ALSDecContext *ctx)
Read an ALSSpecificConfig from a buffer into the output struct.
Definition alsdec.c:297
zero_remaining
static void zero_remaining(unsigned int b, unsigned int b_max, const unsigned int *div_blocks, int32_t *buf)
Compute the number of samples left to decode for the current frame and sets these samples to zero.
Definition alsdec.c:1098
multiply
static SoftFloat_IEEE754 multiply(SoftFloat_IEEE754 a, SoftFloat_IEEE754 b)
multiply two softfloats and handle the rounding off
Definition alsdec.c:1406
read_const_block_data
static int read_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
Read the block data for a constant block.
Definition alsdec.c:603
parcor_rice_table
static const int8_t parcor_rice_table[3][20][2]
Rice parameters and corresponding index offsets for decoding the indices of scaled PARCOR values.
Definition alsdec.c:53
als_class
static const AVClass als_class
Definition alsdec.c:2208
decode_frame
static int decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame_ptr, AVPacket *avpkt)
Decode an ALS frame.
Definition alsdec.c:1816
read_var_block_data
static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
Read the block data for a non-constant block.
Definition alsdec.c:647
als_weighting
static int als_weighting(GetBitContext *gb, int k, int off)
Definition alsdec.c:1237
tail_code
static const uint8_t tail_code[16][6]
Tail codes used in arithmetic coding using block Gilbert-Moore codes.
Definition alsdec.c:134
parcor_to_lpc
static void parcor_to_lpc(unsigned int k, const int32_t *par, int32_t *cof)
Convert PARCOR coefficient k to direct filter coefficient.
Definition alsdec.c:530
read_frame_data
static int read_frame_data(ALSDecContext *ctx, unsigned int ra_frame)
Read the frame data.
Definition alsdec.c:1655
decode_init
static av_cold int decode_init(AVCodecContext *avctx)
Initialize the ALS decoder.
Definition alsdec.c:2006
decode_var_block_data
static int decode_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
Decode the block data for a non-constant block.
Definition alsdec.c:922
RA_Flag
RA_Flag
Definition alsdec.c:154
RA_FLAG_HEADER
@ RA_FLAG_HEADER
Definition alsdec.c:157
RA_FLAG_FRAMES
@ RA_FLAG_FRAMES
Definition alsdec.c:156
RA_FLAG_NONE
@ RA_FLAG_NONE
Definition alsdec.c:155
dprint_specific_config
static av_cold void dprint_specific_config(ALSDecContext *ctx)
Definition alsdec.c:267
decode_end
static av_cold int decode_end(AVCodecContext *avctx)
Uninitialize the ALS decoder.
Definition alsdec.c:1954
mcc_weightings
static const int16_t mcc_weightings[]
Inter-channel weighting factors for multi-channel correlation.
Definition alsdec.c:124
decode_const_block_data
static void decode_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
Decode the block data for a constant block.
Definition alsdec.c:633
decode_blocks_ind
static int decode_blocks_ind(ALSDecContext *ctx, unsigned int ra_frame, unsigned int c, const unsigned int *div_blocks, unsigned int *js_blocks)
Decode blocks independently.
Definition alsdec.c:1113
decode_rice
static int32_t decode_rice(GetBitContext *gb, unsigned int k)
Read and decode a Rice codeword.
Definition alsdec.c:512
ltp_gain_values
static const uint8_t ltp_gain_values[4][4]
Gain values of p(0) for long-term prediction.
Definition alsdec.c:113
read_block
static int read_block(ALSDecContext *ctx, ALSBlockData *bd)
Read the block data.
Definition alsdec.c:1031
revert_channel_correlation
static int revert_channel_correlation(ALSDecContext *ctx, ALSBlockData *bd, ALSChannelData **cd, int *reverted, unsigned int offset, int c)
Recursively reverts the inter-channel correlation for a block.
Definition alsdec.c:1293
parcor_scaled_values
static const int16_t parcor_scaled_values[]
Scaled PARCOR values used for the first two PARCOR coefficients.
Definition alsdec.c:74
read_decode_block
static int read_decode_block(ALSDecContext *ctx, ALSBlockData *bd)
Read and decode block data successively.
Definition alsdec.c:1084
MISSING_ERR
#define MISSING_ERR(cond, str, errval)
check_specific_config
static int check_specific_config(ALSDecContext *ctx)
Check the ALSSpecificConfig for unsupported features.
Definition alsdec.c:465
get_block_sizes
static void get_block_sizes(ALSDecContext *ctx, unsigned int *div_blocks, uint32_t *bs_info)
Read block switching field if necessary and set actual block sizes.
Definition alsdec.c:550
INTERLEAVE_OUTPUT
#define INTERLEAVE_OUTPUT(bps)
parse_bs_info
static void parse_bs_info(const uint32_t bs_info, unsigned int n, unsigned int div, unsigned int **div_blocks, unsigned int *num_blocks)
Parse the bs_info field to extract the block partitioning used in block switching mode,...
Definition alsdec.c:489
read_diff_float_data
static int read_diff_float_data(ALSDecContext *ctx, unsigned int ra_frame)
Read and decode the floating point sample data.
Definition alsdec.c:1465
decode_block
static int decode_block(ALSDecContext *ctx, ALSBlockData *bd)
Decode the block data.
Definition alsdec.c:1058
channels
channels
Definition aptx.h:31
close
static av_cold void close(AVCodecParserContext *s)
Definition apv_parser.c:197
int32_t
int32_t
Definition audioconvert.c:56
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition avassert.h:42
avcodec.h
Libavcodec external API header.
ff_bgmc_init
av_cold int ff_bgmc_init(void *logctx, uint8_t **cf_lut, int **cf_lut_status)
Initialize the lookup table arrays.
Definition bgmc.c:461
ff_bgmc_decode_init
int ff_bgmc_decode_init(GetBitContext *gb, unsigned int *h, unsigned int *l, unsigned int *v)
Initialize decoding and reads the first value.
Definition bgmc.c:489
ff_bgmc_decode
void ff_bgmc_decode(GetBitContext *gb, unsigned int num, int32_t *dst, int delta, unsigned int sx, unsigned int *h, unsigned int *l, unsigned int *v, uint8_t *cf_lut, int *cf_lut_status)
Read and decode a block Gilbert-Moore coded symbol.
Definition bgmc.c:511
ff_bgmc_end
av_cold void ff_bgmc_end(uint8_t **cf_lut, int **cf_lut_status)
Release the lookup table arrays.
Definition bgmc.c:481
ff_bgmc_decode_end
void ff_bgmc_decode_end(GetBitContext *gb)
Finish decoding.
Definition bgmc.c:504
bgmc.h
Block Gilbert-Moore decoder header.
left
static int BS_FUNC left(const BSCTX *bc)
Return the number of the bits left in a buffer.
Definition bitstream_template.h:170
i
#define i(width, name, range_min, range_max)
Definition cbs_h264.c:63
s
#define s(width, name)
Definition cbs_vp9.c:198
codec_internal.h
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition codec_internal.h:374
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition codec_internal.h:359
FF_CODEC_CAP_INIT_CLEANUP
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition codec_internal.h:43
FFABSU
#define FFABSU(a)
Unsigned Absolute value.
Definition common.h:91
av_clip
#define av_clip
Definition common.h:100
av_ceil_log2
#define av_ceil_log2
Definition common.h:97
NULL
#define NULL
Definition coverity.c:32
int64_t
long long int64_t
Definition coverity.c:34
crc.h
Public header for CRC hash function implementation.
max
#define max(a, b)
Definition cuda_runtime.h:33
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition decode.c:1777
AV_EF_CRCCHECK
#define AV_EF_CRCCHECK
Verify checksums embedded in the bitstream (could be of either encoded or decoded data,...
Definition defs.h:48
AV_EF_EXPLODE
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition defs.h:51
AV_EF_CAREFUL
#define AV_EF_CAREFUL
consider things that violate the spec, are fast to calculate and have not been seen in the wild as er...
Definition defs.h:54
frame
static AVFrame * frame
Definition demux_decode.c:54
high
int high
Definition dovi_rpuenc.c:39
flush
void(* flush)(AVBSFContext *ctx)
Definition dts2pts.c:610
init
int(* init)(AVBSFContext *ctx)
Definition dts2pts.c:608
value
double value
Definition eval.c:102
current
static struct @111144215057303131116103221376075045141373005341 current
sample
#define sample
Definition flacdsp_template.c:44
get_bits.h
bitstream reader API header.
get_sbits_long
static int get_sbits_long(GetBitContext *s, int n)
Read 0-32 bits as a signed integer.
Definition get_bits.h:474
get_bits_long
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition get_bits.h:424
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition get_bits.h:688
skip_bits_long
static void skip_bits_long(GetBitContext *s, int n)
Skips the specified number of bits.
Definition get_bits.h:280
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition get_bits.h:391
skip_bits
static void skip_bits(GetBitContext *s, int n)
Definition get_bits.h:383
init_get_bits8
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition get_bits.h:544
align_get_bits
static const uint8_t * align_get_bits(GetBitContext *s)
Definition get_bits.h:560
get_bits_count
static int get_bits_count(const GetBitContext *s)
Definition get_bits.h:254
skip_bits1
static void skip_bits1(GetBitContext *s)
Definition get_bits.h:416
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition get_bits.h:337
get_bitsz
static av_always_inline int get_bitsz(GetBitContext *s, int n)
Read 0-25 bits.
Definition get_bits.h:353
fail
#define fail
Definition test.h:479
AV_OPT_FLAG_AUDIO_PARAM
#define AV_OPT_FLAG_AUDIO_PARAM
Definition opt.h:356
AV_OPT_FLAG_DECODING_PARAM
#define AV_OPT_FLAG_DECODING_PARAM
A generic parameter which can be set by the user for demuxing or decoding.
Definition opt.h:355
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Underlying C type is int.
Definition opt.h:258
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition codec.h:49
AV_CODEC_CAP_CHANNEL_CONF
#define AV_CODEC_CAP_CHANNEL_CONF
Codec should fill in channel configuration and samplerate instead of container.
Definition codec.h:94
AV_CODEC_ID_MP4ALS
@ AV_CODEC_ID_MP4ALS
Definition codec_id.h:498
av_channel_layout_uninit
void av_channel_layout_uninit(AVChannelLayout *channel_layout)
Free any allocated data in the channel layout and reset the channel count to 0.
Definition channel_layout.c:443
AV_CHANNEL_ORDER_UNSPEC
@ AV_CHANNEL_ORDER_UNSPEC
Only the channel count is specified, without any further information about the channel order.
Definition channel_layout.h:119
av_crc_get_table
const AVCRC * av_crc_get_table(AVCRCId crc_id)
Get an initialized standard CRC table.
Definition crc.c:389
AVCRC
uint32_t AVCRC
Definition crc.h:46
av_crc
uint32_t av_crc(const AVCRC *ctx, uint32_t crc, const uint8_t *buffer, size_t length)
Calculate the CRC of a block.
Definition crc.c:421
AV_CRC_32_IEEE_LE
@ AV_CRC_32_IEEE_LE
Definition crc.h:53
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition error.h:64
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition error.h:61
AVERROR
#define AVERROR(e)
Definition error.h:45
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition log.h:216
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition log.h:210
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition log.c:241
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition avutil.h:201
av_get_bytes_per_sample
int av_get_bytes_per_sample(enum AVSampleFormat sample_fmt)
Return number of bytes per sample.
Definition samplefmt.c:108
AV_SAMPLE_FMT_FLT
@ AV_SAMPLE_FMT_FLT
float
Definition samplefmt.h:60
AV_SAMPLE_FMT_S32
@ AV_SAMPLE_FMT_S32
signed 32 bits
Definition samplefmt.h:59
AV_SAMPLE_FMT_S16
@ AV_SAMPLE_FMT_S16
signed 16 bits
Definition samplefmt.h:58
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition version.h:85
a
int a
Definition h264pred_template.c:416
r
#define r
Definition input.c:42
b
#define b
Definition input.c:43
av_log2
#define av_log2
Definition intmath.h:84
scale
static void scale(int *out, const int *in, const int w, const int h, const int shift)
Definition intra.c:278
AV_RB32
#define AV_RB32(p)
Definition intreadwrite.h:412
offset
unsigned offset
Definition libaomenc.c:763
decode_init
static av_cold int decode_init(AVCodecContext *avctx)
Definition 4xm.c:998
decode_end
static av_cold int decode_end(AVCodecContext *avctx)
Definition 4xm.c:980
decode_frame
static int decode_frame(AVCodecContext *avctx, AVFrame *picture, int *got_frame, AVPacket *avpkt)
Definition 4xm.c:837
shift
static int shift(int a, int b)
Definition bonk.c:261
ff_bswapdsp_init
av_cold void ff_bswapdsp_init(BswapDSPContext *c)
Definition bswapdsp.c:37
internal.h
common internal api header.
FF_SANE_NB_CHANNELS
#define FF_SANE_NB_CHANNELS
Definition internal.h:37
av_cold
#define av_cold
Definition attributes.h:117
FFMIN
#define FFMIN(a, b)
Definition macros.h:49
MKBETAG
#define MKBETAG(a, b, c, d)
Definition macros.h:56
FFMAX
#define FFMAX(a, b)
Definition macros.h:47
MUL64
#define MUL64(a, b)
Definition mathops.h:56
av_calloc
void * av_calloc(size_t nmemb, size_t size)
Definition mem.c:264
mem.h
Memory handling functions.
ff_mlz_flush_dict
av_cold void ff_mlz_flush_dict(MLZ *mlz)
Flush the dictionary.
Definition mlz.c:41
ff_mlz_decompression
int ff_mlz_decompression(MLZ *mlz, GetBitContext *gb, int size, unsigned char *buff)
Run mlz decompression on the next size bits and the output will be stored in buff.
Definition mlz.c:129
ff_mlz_init_dict
av_cold int ff_mlz_init_dict(void *context, MLZ *mlz)
Initialize the dictionary.
Definition mlz.c:24
avpriv_mpeg4audio_get_config2
int avpriv_mpeg4audio_get_config2(MPEG4AudioConfig *c, const uint8_t *buf, int size, int sync_extension, void *logctx)
Parse MPEG-4 systems extradata from a raw buffer to retrieve audio configuration.
Definition mpeg4audio.c:212
opt.h
AVOptions.
av_bswap32
#define av_bswap32
Definition bswap.h:47
av_bswap16
#define av_bswap16
Definition bswap.h:28
FF_ARRAY_ELEMS
#define FF_ARRAY_ELEMS(a)
Definition sinewin_tablegen.c:29
FLOAT_1
static const SoftFloat FLOAT_1
1.0
Definition softfloat.h:41
FLOAT_0
static const SoftFloat FLOAT_0
0.0
Definition softfloat.h:39
softfloat_ieee754.h
av_div_sf_ieee754
static SoftFloat_IEEE754 av_div_sf_ieee754(SoftFloat_IEEE754 a, SoftFloat_IEEE754 b)
Divide a by b.
Definition softfloat_ieee754.h:80
av_cmp_sf_ieee754
static int av_cmp_sf_ieee754(SoftFloat_IEEE754 a, SoftFloat_IEEE754 b)
Compare a with b strictly.
Definition softfloat_ieee754.h:106
av_bits2sf_ieee754
static SoftFloat_IEEE754 av_bits2sf_ieee754(uint32_t n)
Make a softfloat out of the bitstream.
Definition softfloat_ieee754.h:66
EXP_BIAS
#define EXP_BIAS
Definition softfloat_ieee754.h:26
av_int2sf_ieee754
static SoftFloat_IEEE754 av_int2sf_ieee754(int64_t n, int e)
Convert integer to softfloat.
Definition softfloat_ieee754.h:53
ALSBlockData::shift_lsbs
unsigned int * shift_lsbs
shift of values for this block
Definition alsdec.c:253
ALSBlockData::prev_raw_samples
int32_t * prev_raw_samples
contains unshifted raw samples from the previous block
Definition alsdec.c:262
ALSBlockData::raw_samples
int32_t * raw_samples
decoded raw samples / residuals for this block
Definition alsdec.c:261
ALSBlockData::const_block
int * const_block
if true, this is a constant value block
Definition alsdec.c:251
ALSBlockData::use_ltp
int * use_ltp
if true, long-term prediction is used
Definition alsdec.c:256
ALSBlockData::ra_block
unsigned int ra_block
if true, this is a random access block
Definition alsdec.c:250
ALSBlockData::quant_cof
int32_t * quant_cof
quantized parcor coefficients
Definition alsdec.c:259
ALSBlockData::block_length
unsigned int block_length
number of samples within the block
Definition alsdec.c:249
ALSBlockData::ltp_lag
int * ltp_lag
lag value for long-term prediction
Definition alsdec.c:257
ALSBlockData::js_blocks
int js_blocks
true if this block contains a difference signal
Definition alsdec.c:252
ALSBlockData::opt_order
unsigned int * opt_order
prediction order of this block
Definition alsdec.c:254
ALSBlockData::ltp_gain
int * ltp_gain
gain values for ltp 5-tap filter
Definition alsdec.c:258
ALSBlockData::lpc_cof
int32_t * lpc_cof
coefficients of the direct form prediction
Definition alsdec.c:260
ALSBlockData::store_prev_samples
int * store_prev_samples
if true, carryover samples have to be stored
Definition alsdec.c:255
ALSBlockData::raw_other
int32_t * raw_other
decoded raw samples of the other channel of a channel pair
Definition alsdec.c:263
ALSChannelData::time_diff_index
int time_diff_index
Definition alsdec.c:192
ALSChannelData::time_diff_sign
int time_diff_sign
Definition alsdec.c:191
ALSChannelData::master_channel
int master_channel
Definition alsdec.c:189
ALSChannelData::time_diff_flag
int time_diff_flag
Definition alsdec.c:190
ALSChannelData::weighting
int weighting[6]
Definition alsdec.c:193
ALSDecContext::shift_value
int * shift_value
value by which the binary point is to be shifted for all channels
Definition alsdec.c:238
ALSDecContext::av_class
AVClass * av_class
Definition alsdec.c:198
ALSDecContext::lpc_cof_buffer
int32_t * lpc_cof_buffer
contains all coefficients of the direct form prediction filter
Definition alsdec.c:226
ALSDecContext::ltp_gain_buffer
int * ltp_gain_buffer
contains all gain values for ltp 5-tap filter
Definition alsdec.c:222
ALSDecContext::quant_cof_buffer
int32_t * quant_cof_buffer
contains all quantized parcor coefficients
Definition alsdec.c:224
ALSDecContext::crc_org
uint32_t crc_org
CRC value of the original input data.
Definition alsdec.c:204
ALSDecContext::raw_buffer
int32_t * raw_buffer
contains all decoded raw samples including carryover samples
Definition alsdec.c:233
ALSDecContext::s_max
unsigned int s_max
maximum Rice parameter allowed in entropy coding
Definition alsdec.c:211
ALSDecContext::frame_id
unsigned int frame_id
the frame ID / number of the current frame
Definition alsdec.c:207
ALSDecContext::raw_samples
int32_t ** raw_samples
decoded raw samples for each channel
Definition alsdec.c:232
ALSDecContext::crc_buffer
uint8_t * crc_buffer
buffer of byte order corrected samples used for CRC check
Definition alsdec.c:234
ALSDecContext::acf
SoftFloat_IEEE754 * acf
contains common multiplier for all channels
Definition alsdec.c:236
ALSDecContext::raw_mantissa
int ** raw_mantissa
decoded mantissa bits of the difference signal
Definition alsdec.c:240
ALSDecContext::highest_decoded_channel
int highest_decoded_channel
Definition alsdec.c:243
ALSDecContext::num_blocks
unsigned int num_blocks
number of blocks used in the current frame
Definition alsdec.c:210
ALSDecContext::chan_data
ALSChannelData ** chan_data
channel data for multi-channel correlation
Definition alsdec.c:228
ALSDecContext::user_max_order
int user_max_order
user specified maximum prediction order
Definition alsdec.c:244
ALSDecContext::sconf
ALSSpecificConfig sconf
Definition alsdec.c:200
ALSDecContext::js_switch
unsigned int js_switch
if true, joint-stereo decoding is enforced
Definition alsdec.c:208
ALSDecContext::lpc_cof
int32_t ** lpc_cof
coefficients of the direct form prediction filter for a channel
Definition alsdec.c:225
ALSDecContext::nbits
int * nbits
contains the number of bits to read for masked lz decompression for all samples
Definition alsdec.c:242
ALSDecContext::opt_order
unsigned int * opt_order
contains opt_order flags for all channels
Definition alsdec.c:217
ALSDecContext::bgmc_lut_status
int * bgmc_lut_status
pointer at lookup table status flags used for BGMC
Definition alsdec.c:213
ALSDecContext::bdsp
BswapDSPContext bdsp
Definition alsdec.c:202
ALSDecContext::mlz
MLZ * mlz
masked lz decompression structure
Definition alsdec.c:235
ALSDecContext::last_acf_mantissa
int * last_acf_mantissa
contains the last acf mantissa data of common multiplier for all channels
Definition alsdec.c:237
ALSDecContext::quant_cof
int32_t ** quant_cof
quantized parcor coefficients for a channel
Definition alsdec.c:223
ALSDecContext::chan_data_buffer
ALSChannelData * chan_data_buffer
contains channel data for all channels
Definition alsdec.c:229
ALSDecContext::cur_frame_length
unsigned int cur_frame_length
length of the current frame to decode
Definition alsdec.c:206
ALSDecContext::prev_raw_samples
int32_t * prev_raw_samples
contains unshifted raw samples from the previous block
Definition alsdec.c:231
ALSDecContext::ltp_lag_length
int ltp_lag_length
number of bits used for ltp lag value
Definition alsdec.c:214
ALSDecContext::avctx
AVCodecContext * avctx
Definition alsdec.c:199
ALSDecContext::use_ltp
int * use_ltp
contains use_ltp flags for all channels
Definition alsdec.c:219
ALSDecContext::ltp_gain
int ** ltp_gain
gain values for ltp 5-tap filter for a channel
Definition alsdec.c:221
ALSDecContext::crc_table
const AVCRC * crc_table
Definition alsdec.c:203
ALSDecContext::bgmc_lut
uint8_t * bgmc_lut
pointer at lookup tables used for BGMC
Definition alsdec.c:212
ALSDecContext::cs_switch
unsigned int cs_switch
if true, channel rearrangement is done
Definition alsdec.c:209
ALSDecContext::lpc_cof_reversed_buffer
int32_t * lpc_cof_reversed_buffer
temporary buffer to set up a reversed version of lpc_cof_buffer
Definition alsdec.c:227
ALSDecContext::last_shift_value
int * last_shift_value
contains last shift value for all channels
Definition alsdec.c:239
ALSDecContext::reverted_channels
int * reverted_channels
stores a flag for each reverted channel
Definition alsdec.c:230
ALSDecContext::shift_lsbs
unsigned int * shift_lsbs
contains shift_lsbs flags for all channels
Definition alsdec.c:216
ALSDecContext::larray
unsigned char * larray
buffer to store the output of masked lz decompression
Definition alsdec.c:241
ALSDecContext::crc
uint32_t crc
CRC value calculated from decoded data.
Definition alsdec.c:205
ALSDecContext::ltp_lag
int * ltp_lag
contains ltp lag values for all channels
Definition alsdec.c:220
ALSDecContext::gb
GetBitContext gb
Definition alsdec.c:201
ALSDecContext::store_prev_samples
int * store_prev_samples
contains store_prev_samples flags for all channels
Definition alsdec.c:218
ALSDecContext::const_block
int * const_block
contains const_block flags for all channels
Definition alsdec.c:215
ALSSpecificConfig::floating
int floating
1 = IEEE 32-bit floating-point, 0 = integer
Definition alsdec.c:164
ALSSpecificConfig::crc_enabled
int crc_enabled
enable Cyclic Redundancy Checksum
Definition alsdec.c:183
ALSSpecificConfig::chan_config
int chan_config
indicates that a chan_config_info field is present
Definition alsdec.c:178
ALSSpecificConfig::resolution
int resolution
000 = 8-bit; 001 = 16-bit; 010 = 24-bit; 011 = 32-bit
Definition alsdec.c:163
ALSSpecificConfig::chan_pos
int * chan_pos
original channel positions
Definition alsdec.c:182
ALSSpecificConfig::msb_first
int msb_first
1 = original CRC calculated on big-endian system, 0 = little-endian
Definition alsdec.c:165
ALSSpecificConfig::chan_sort
int chan_sort
channel rearrangement: 1 = on, 0 = off
Definition alsdec.c:179
ALSSpecificConfig::block_switching
int block_switching
number of block switching levels
Definition alsdec.c:173
ALSSpecificConfig::rlslms
int rlslms
use "Recursive Least Square-Least Mean Square" predictor: 1 = on, 0 = off
Definition alsdec.c:180
ALSSpecificConfig::joint_stereo
int joint_stereo
joint stereo: 1 = on, 0 = off
Definition alsdec.c:176
ALSSpecificConfig::coef_table
int coef_table
table index of Rice code parameters
Definition alsdec.c:170
ALSSpecificConfig::frame_length
int frame_length
frame length for each frame (last frame may differ)
Definition alsdec.c:166
ALSSpecificConfig::adapt_order
int adapt_order
adaptive order: 1 = on, 0 = off
Definition alsdec.c:169
ALSSpecificConfig::ra_distance
int ra_distance
distance between RA frames (in frames, 0...255)
Definition alsdec.c:167
ALSSpecificConfig::max_order
int max_order
maximum prediction order (0..1023)
Definition alsdec.c:172
ALSSpecificConfig::ra_flag
enum RA_Flag ra_flag
indicates where the size of ra units is stored
Definition alsdec.c:168
ALSSpecificConfig::long_term_prediction
int long_term_prediction
long term prediction (LTP): 1 = on, 0 = off
Definition alsdec.c:171
ALSSpecificConfig::chan_config_info
int chan_config_info
mapping of channels to loudspeaker locations. Unused until setting channel configuration is implement...
Definition alsdec.c:181
ALSSpecificConfig::mc_coding
int mc_coding
extended inter-channel coding (multi channel coding): 1 = on, 0 = off
Definition alsdec.c:177
ALSSpecificConfig::samples
uint32_t samples
number of samples, 0xFFFFFFFF if unknown
Definition alsdec.c:162
ALSSpecificConfig::sb_part
int sb_part
sub-block partition
Definition alsdec.c:175
ALSSpecificConfig::bgmc
int bgmc
"Block Gilbert-Moore Code": 1 = on, 0 = off (Rice coding only)
Definition alsdec.c:174
AVChannelLayout::order
enum AVChannelOrder order
Channel order used in this layout.
Definition channel_layout.h:324
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition channel_layout.h:329
AVClass
Describe the class of an AVClass context structure.
Definition log.h:76
AVCodecContext
main external API structure.
Definition avcodec.h:443
AVCodecContext::ch_layout
AVChannelLayout ch_layout
Audio channel layout.
Definition avcodec.h:1055
AVCodecContext::sample_fmt
enum AVSampleFormat sample_fmt
audio sample format
Definition avcodec.h:1047
AVCodecContext::bits_per_raw_sample
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition avcodec.h:1571
AVCodecContext::sample_rate
int sample_rate
samples per second
Definition avcodec.h:1040
AVCodecContext::extradata
uint8_t * extradata
Out-of-band global headers that may be used by some codecs.
Definition avcodec.h:526
AVCodecContext::extradata_size
int extradata_size
Definition avcodec.h:527
AVCodecContext::priv_data
void * priv_data
Definition avcodec.h:470
AVCodecContext::err_recognition
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition avcodec.h:1416
AVFrame
This structure describes decoded (raw) audio or video data.
Definition frame.h:472
AVOption
AVOption.
Definition opt.h:428
AVPacket
This structure stores compressed data.
Definition packet.h:580
AVPacket::size
int size
Definition packet.h:604
AVPacket::data
uint8_t * data
Definition packet.h:603
MLZ
MLZ data structure.
Definition mlz.h:47
SoftFloat_IEEE754
Definition softfloat_ieee754.h:29
SoftFloat_IEEE754::sign
int32_t sign
Definition softfloat_ieee754.h:30
SoftFloat_IEEE754::mant
uint64_t mant
Definition softfloat_ieee754.h:31
SoftFloat_IEEE754::exp
int32_t exp
Definition softfloat_ieee754.h:32
av_malloc_array
#define av_malloc_array(a, b)
Definition tableprint_vlc.h:32
av_mallocz
#define av_mallocz(s)
Definition tableprint_vlc.h:31
ff_dlog
#define ff_dlog(a,...)
Definition tableprint_vlc.h:28
avpriv_request_sample
#define avpriv_request_sample(...)
Definition tableprint_vlc.h:37
av_freep
#define av_freep(p)
Definition tableprint_vlc.h:35
av_log
#define av_log(a,...)
Definition tableprint_vlc.h:27
error
static void error(const char *err)
Definition target_bsf_fuzzer.c:32
src
#define src
Definition vp8dsp.c:248
ctx
static AVFormatContext * ctx
Definition movenc.c:49
buffer
static char buffer[20]
Definition seek.c:32
tab
static const struct twinvq_data tab
Definition twinvq_data.h:10345
get_unary
static int get_unary(GetBitContext *gb, int stop, int len)
Get unary code of limited length.
Definition unary.h:46
master
const char * master
Definition vf_curves.c:130
delta
float delta
Definition vorbis_enc_data.h:430
base
uint8_t base
Definition vp3data.h:128
c
static double c[64]
Definition vsrc_mptestsrc.c:89
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