FFmpeg
mpc8.c
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1 /*
2  * Musepack SV8 decoder
3  * Copyright (c) 2007 Konstantin Shishkov
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 Audio Layer 1/2 -like codec with frames of 1152 samples
25  * divided into 32 subbands.
26  */
27 
29 #include "libavutil/lfg.h"
30 #include "avcodec.h"
31 #include "get_bits.h"
32 #include "internal.h"
33 #include "mpegaudiodsp.h"
34 
35 #include "mpc.h"
36 #include "mpc8data.h"
37 #include "mpc8huff.h"
38 
39 static VLC band_vlc, scfi_vlc[2], dscf_vlc[2], res_vlc[2];
40 static VLC q1_vlc, q2_vlc[2], q3_vlc[2], quant_vlc[4][2], q9up_vlc;
41 
42 static const int q3_offsets[2] = { MPC8_Q3_OFFSET, MPC8_Q4_OFFSET };
44 
45 static inline int mpc8_dec_base(GetBitContext *gb, int k, int n)
46 {
47  int len = mpc8_cnk_len[k-1][n-1] - 1;
48  int code = len ? get_bits_long(gb, len) : 0;
49 
50  if (code >= mpc8_cnk_lost[k-1][n-1])
51  code = ((code << 1) | get_bits1(gb)) - mpc8_cnk_lost[k-1][n-1];
52 
53  return code;
54 }
55 
56 static inline int mpc8_dec_enum(GetBitContext *gb, int k, int n)
57 {
58  int bits = 0;
59  const uint32_t * C = mpc8_cnk[k-1];
60  int code = mpc8_dec_base(gb, k, n);
61 
62  do {
63  n--;
64  if (code >= C[n]) {
65  bits |= 1U << n;
66  code -= C[n];
67  C -= 32;
68  k--;
69  }
70  } while(k > 0);
71 
72  return bits;
73 }
74 
75 static inline int mpc8_get_mod_golomb(GetBitContext *gb, int m)
76 {
77  if(mpc8_cnk_len[0][m] < 1) return 0;
78  return mpc8_dec_base(gb, 1, m+1);
79 }
80 
81 static int mpc8_get_mask(GetBitContext *gb, int size, int t)
82 {
83  int mask = 0;
84 
85  if(t && t != size)
86  mask = mpc8_dec_enum(gb, FFMIN(t, size - t), size);
87  if((t << 1) > size) mask = ~mask;
88 
89  return mask;
90 }
91 
92 static const uint16_t vlc_offsets[13] = {
93  0, 640, 1184, 1748, 2298, 2426, 2554, 3066, 3578, 4106, 4618, 5196, 5708
94 };
95 
97 {
98  int i;
99  MPCContext *c = avctx->priv_data;
100  GetBitContext gb;
101  static int vlc_initialized = 0;
102  int channels;
103 
104  static VLC_TYPE band_table[542][2];
105  static VLC_TYPE q1_table[520][2];
106  static VLC_TYPE q9up_table[524][2];
107  static VLC_TYPE scfi0_table[1 << MPC8_SCFI0_BITS][2];
108  static VLC_TYPE scfi1_table[1 << MPC8_SCFI1_BITS][2];
109  static VLC_TYPE dscf0_table[560][2];
110  static VLC_TYPE dscf1_table[598][2];
111  static VLC_TYPE q3_0_table[512][2];
112  static VLC_TYPE q3_1_table[516][2];
113  static VLC_TYPE codes_table[5708][2];
114 
115  if(avctx->extradata_size < 2){
116  av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
117  return -1;
118  }
119  memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
120  av_lfg_init(&c->rnd, 0xDEADBEEF);
121  ff_mpadsp_init(&c->mpadsp);
122 
123  init_get_bits(&gb, avctx->extradata, 16);
124 
125  skip_bits(&gb, 3);//sample rate
126  c->maxbands = get_bits(&gb, 5) + 1;
127  if (c->maxbands >= BANDS) {
128  av_log(avctx,AV_LOG_ERROR, "maxbands %d too high\n", c->maxbands);
129  return AVERROR_INVALIDDATA;
130  }
131  channels = get_bits(&gb, 4) + 1;
132  if (channels > 2) {
133  avpriv_request_sample(avctx, "Multichannel MPC SV8");
134  return AVERROR_PATCHWELCOME;
135  }
136  c->MSS = get_bits1(&gb);
137  c->frames = 1 << (get_bits(&gb, 3) * 2);
138 
140  avctx->channel_layout = (channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
141  avctx->channels = channels;
142 
143  if(vlc_initialized) return 0;
144  av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n");
145 
146  band_vlc.table = band_table;
147  band_vlc.table_allocated = 542;
149  mpc8_bands_bits, 1, 1,
151 
152  q1_vlc.table = q1_table;
153  q1_vlc.table_allocated = 520;
155  mpc8_q1_bits, 1, 1,
157  q9up_vlc.table = q9up_table;
158  q9up_vlc.table_allocated = 524;
160  mpc8_q9up_bits, 1, 1,
162 
163  scfi_vlc[0].table = scfi0_table;
164  scfi_vlc[0].table_allocated = 1 << MPC8_SCFI0_BITS;
166  mpc8_scfi0_bits, 1, 1,
168  scfi_vlc[1].table = scfi1_table;
169  scfi_vlc[1].table_allocated = 1 << MPC8_SCFI1_BITS;
171  mpc8_scfi1_bits, 1, 1,
173 
174  dscf_vlc[0].table = dscf0_table;
175  dscf_vlc[0].table_allocated = 560;
177  mpc8_dscf0_bits, 1, 1,
179  dscf_vlc[1].table = dscf1_table;
180  dscf_vlc[1].table_allocated = 598;
182  mpc8_dscf1_bits, 1, 1,
184 
185  q3_vlc[0].table = q3_0_table;
186  q3_vlc[0].table_allocated = 512;
188  mpc8_q3_bits, 1, 1,
189  mpc8_q3_codes, 1, 1,
191  q3_vlc[1].table = q3_1_table;
192  q3_vlc[1].table_allocated = 516;
194  mpc8_q4_bits, 1, 1,
195  mpc8_q4_codes, 1, 1,
197 
198  for(i = 0; i < 2; i++){
199  res_vlc[i].table = &codes_table[vlc_offsets[0+i]];
200  res_vlc[i].table_allocated = vlc_offsets[1+i] - vlc_offsets[0+i];
201  init_vlc(&res_vlc[i], MPC8_RES_BITS, MPC8_RES_SIZE,
202  &mpc8_res_bits[i], 1, 1,
204 
205  q2_vlc[i].table = &codes_table[vlc_offsets[2+i]];
206  q2_vlc[i].table_allocated = vlc_offsets[3+i] - vlc_offsets[2+i];
207  init_vlc(&q2_vlc[i], MPC8_Q2_BITS, MPC8_Q2_SIZE,
208  &mpc8_q2_bits[i], 1, 1,
210 
211  quant_vlc[0][i].table = &codes_table[vlc_offsets[4+i]];
212  quant_vlc[0][i].table_allocated = vlc_offsets[5+i] - vlc_offsets[4+i];
213  init_vlc(&quant_vlc[0][i], MPC8_Q5_BITS, MPC8_Q5_SIZE,
214  &mpc8_q5_bits[i], 1, 1,
216  quant_vlc[1][i].table = &codes_table[vlc_offsets[6+i]];
217  quant_vlc[1][i].table_allocated = vlc_offsets[7+i] - vlc_offsets[6+i];
218  init_vlc(&quant_vlc[1][i], MPC8_Q6_BITS, MPC8_Q6_SIZE,
219  &mpc8_q6_bits[i], 1, 1,
221  quant_vlc[2][i].table = &codes_table[vlc_offsets[8+i]];
222  quant_vlc[2][i].table_allocated = vlc_offsets[9+i] - vlc_offsets[8+i];
223  init_vlc(&quant_vlc[2][i], MPC8_Q7_BITS, MPC8_Q7_SIZE,
224  &mpc8_q7_bits[i], 1, 1,
226  quant_vlc[3][i].table = &codes_table[vlc_offsets[10+i]];
227  quant_vlc[3][i].table_allocated = vlc_offsets[11+i] - vlc_offsets[10+i];
228  init_vlc(&quant_vlc[3][i], MPC8_Q8_BITS, MPC8_Q8_SIZE,
229  &mpc8_q8_bits[i], 1, 1,
231  }
232  vlc_initialized = 1;
234 
235  return 0;
236 }
237 
238 static int mpc8_decode_frame(AVCodecContext * avctx, void *data,
239  int *got_frame_ptr, AVPacket *avpkt)
240 {
241  AVFrame *frame = data;
242  const uint8_t *buf = avpkt->data;
243  int buf_size = avpkt->size;
244  MPCContext *c = avctx->priv_data;
245  GetBitContext gb2, *gb = &gb2;
246  int i, j, k, ch, cnt, res, t;
247  Band *bands = c->bands;
248  int off;
249  int maxband, keyframe;
250  int last[2];
251 
252  keyframe = c->cur_frame == 0;
253 
254  if(keyframe){
255  memset(c->Q, 0, sizeof(c->Q));
256  c->last_bits_used = 0;
257  }
258  if ((res = init_get_bits8(gb, buf, buf_size)) < 0)
259  return res;
260 
261  skip_bits(gb, c->last_bits_used & 7);
262 
263  if(keyframe)
264  maxband = mpc8_get_mod_golomb(gb, c->maxbands + 1);
265  else{
266  maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2);
267  if(maxband > 32) maxband -= 33;
268  }
269 
270  if (get_bits_left(gb) < 0) {
271  *got_frame_ptr = 0;
272  return buf_size;
273  }
274 
275  if(maxband > c->maxbands + 1) {
276  av_log(avctx, AV_LOG_ERROR, "maxband %d too large\n",maxband);
277  return AVERROR_INVALIDDATA;
278  }
279  c->last_max_band = maxband;
280 
281  /* read subband indexes */
282  if(maxband){
283  last[0] = last[1] = 0;
284  for(i = maxband - 1; i >= 0; i--){
285  for(ch = 0; ch < 2; ch++){
286  last[ch] = get_vlc2(gb, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch];
287  if(last[ch] > 15) last[ch] -= 17;
288  bands[i].res[ch] = last[ch];
289  }
290  }
291  if(c->MSS){
292  int mask;
293 
294  cnt = 0;
295  for(i = 0; i < maxband; i++)
296  if(bands[i].res[0] || bands[i].res[1])
297  cnt++;
298  t = mpc8_get_mod_golomb(gb, cnt);
299  mask = mpc8_get_mask(gb, cnt, t);
300  for(i = maxband - 1; i >= 0; i--)
301  if(bands[i].res[0] || bands[i].res[1]){
302  bands[i].msf = mask & 1;
303  mask >>= 1;
304  }
305  }
306  }
307  for(i = maxband; i < c->maxbands; i++)
308  bands[i].res[0] = bands[i].res[1] = 0;
309 
310  if(keyframe){
311  for(i = 0; i < 32; i++)
312  c->oldDSCF[0][i] = c->oldDSCF[1][i] = 1;
313  }
314 
315  for(i = 0; i < maxband; i++){
316  if(bands[i].res[0] || bands[i].res[1]){
317  cnt = !!bands[i].res[0] + !!bands[i].res[1] - 1;
318  if(cnt >= 0){
319  t = get_vlc2(gb, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1);
320  if(bands[i].res[0]) bands[i].scfi[0] = t >> (2 * cnt);
321  if(bands[i].res[1]) bands[i].scfi[1] = t & 3;
322  }
323  }
324  }
325 
326  for(i = 0; i < maxband; i++){
327  for(ch = 0; ch < 2; ch++){
328  if(!bands[i].res[ch]) continue;
329 
330  if(c->oldDSCF[ch][i]){
331  bands[i].scf_idx[ch][0] = get_bits(gb, 7) - 6;
332  c->oldDSCF[ch][i] = 0;
333  }else{
334  t = get_vlc2(gb, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2);
335  if(t == 64)
336  t += get_bits(gb, 6);
337  bands[i].scf_idx[ch][0] = ((bands[i].scf_idx[ch][2] + t - 25) & 0x7F) - 6;
338  }
339  for(j = 0; j < 2; j++){
340  if((bands[i].scfi[ch] << j) & 2)
341  bands[i].scf_idx[ch][j + 1] = bands[i].scf_idx[ch][j];
342  else{
343  t = get_vlc2(gb, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2);
344  if(t == 31)
345  t = 64 + get_bits(gb, 6);
346  bands[i].scf_idx[ch][j + 1] = ((bands[i].scf_idx[ch][j] + t - 25) & 0x7F) - 6;
347  }
348  }
349  }
350  }
351 
352  for(i = 0, off = 0; i < maxband; i++, off += SAMPLES_PER_BAND){
353  for(ch = 0; ch < 2; ch++){
354  res = bands[i].res[ch];
355  switch(res){
356  case -1:
357  for(j = 0; j < SAMPLES_PER_BAND; j++)
358  c->Q[ch][off + j] = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
359  break;
360  case 0:
361  break;
362  case 1:
363  for(j = 0; j < SAMPLES_PER_BAND; j += SAMPLES_PER_BAND / 2){
364  cnt = get_vlc2(gb, q1_vlc.table, MPC8_Q1_BITS, 2);
365  t = mpc8_get_mask(gb, 18, cnt);
366  for(k = 0; k < SAMPLES_PER_BAND / 2; k++)
367  c->Q[ch][off + j + k] = t & (1 << (SAMPLES_PER_BAND / 2 - k - 1))
368  ? (get_bits1(gb) << 1) - 1 : 0;
369  }
370  break;
371  case 2:
372  cnt = 6;//2*mpc8_thres[res]
373  for(j = 0; j < SAMPLES_PER_BAND; j += 3){
374  t = get_vlc2(gb, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2);
375  c->Q[ch][off + j + 0] = mpc8_idx50[t];
376  c->Q[ch][off + j + 1] = mpc8_idx51[t];
377  c->Q[ch][off + j + 2] = mpc8_idx52[t];
378  cnt = (cnt >> 1) + mpc8_huffq2[t];
379  }
380  break;
381  case 3:
382  case 4:
383  for(j = 0; j < SAMPLES_PER_BAND; j += 2){
384  t = get_vlc2(gb, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2) + q3_offsets[res - 3];
385  c->Q[ch][off + j + 1] = t >> 4;
386  c->Q[ch][off + j + 0] = sign_extend(t, 4);
387  }
388  break;
389  case 5:
390  case 6:
391  case 7:
392  case 8:
393  cnt = 2 * mpc8_thres[res];
394  for(j = 0; j < SAMPLES_PER_BAND; j++){
395  t = get_vlc2(gb, quant_vlc[res - 5][cnt > mpc8_thres[res]].table, quant_vlc[res - 5][cnt > mpc8_thres[res]].bits, 2) + quant_offsets[res - 5];
396  c->Q[ch][off + j] = t;
397  cnt = (cnt >> 1) + FFABS(c->Q[ch][off + j]);
398  }
399  break;
400  default:
401  for(j = 0; j < SAMPLES_PER_BAND; j++){
402  c->Q[ch][off + j] = get_vlc2(gb, q9up_vlc.table, MPC8_Q9UP_BITS, 2);
403  if(res != 9){
404  c->Q[ch][off + j] <<= res - 9;
405  c->Q[ch][off + j] |= get_bits(gb, res - 9);
406  }
407  c->Q[ch][off + j] -= (1 << (res - 2)) - 1;
408  }
409  }
410  }
411  }
412 
413  frame->nb_samples = MPC_FRAME_SIZE;
414  if ((res = ff_get_buffer(avctx, frame, 0)) < 0)
415  return res;
416 
417  ff_mpc_dequantize_and_synth(c, maxband - 1,
418  (int16_t **)frame->extended_data,
419  avctx->channels);
420 
421  c->cur_frame++;
422 
424  if(c->cur_frame >= c->frames)
425  c->cur_frame = 0;
426  if (get_bits_left(gb) < 0) {
427  av_log(avctx, AV_LOG_ERROR, "Overread %d\n", -get_bits_left(gb));
428  c->last_bits_used = buf_size << 3;
429  } else if (c->cur_frame == 0 && get_bits_left(gb) < 8) {// we have only padding left
430  c->last_bits_used = buf_size << 3;
431  }
432 
433  *got_frame_ptr = 1;
434 
435  return c->cur_frame ? c->last_bits_used >> 3 : buf_size;
436 }
437 
439 {
440  MPCContext *c = avctx->priv_data;
441  c->cur_frame = 0;
442 }
443 
445  .name = "mpc8",
446  .long_name = NULL_IF_CONFIG_SMALL("Musepack SV8"),
447  .type = AVMEDIA_TYPE_AUDIO,
448  .id = AV_CODEC_ID_MUSEPACK8,
449  .priv_data_size = sizeof(MPCContext),
453  .capabilities = AV_CODEC_CAP_DR1,
454  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
456 };
static const int quant_offsets[6]
Definition: mpc8.c:43
void ff_mpc_dequantize_and_synth(MPCContext *c, int maxband, int16_t **out, int channels)
Definition: mpc.c:56
static const uint8_t mpc8_scfi1_bits[MPC8_SCFI1_SIZE]
Definition: mpc8huff.h:63
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
This structure describes decoded (raw) audio or video data.
Definition: frame.h:308
static VLC q2_vlc[2]
Definition: mpc8.c:40
#define MPC8_Q8_BITS
Definition: mpc8huff.h:498
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
static void flush(AVCodecContext *avctx)
static const uint8_t mpc8_q4_bits[MPC8_Q4_SIZE]
Definition: mpc8huff.h:363
MPADSPContext mpadsp
Definition: mpc.h:54
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
static const uint8_t mpc8_q3_bits[MPC8_Q3_SIZE]
Definition: mpc8huff.h:327
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
#define avpriv_request_sample(...)
#define MPC8_SCFI0_SIZE
Definition: mpc8huff.h:45
int msf
mid-stereo flag
Definition: mpc.h:45
int ff_init_vlc_sparse(VLC *vlc_arg, int nb_bits, int nb_codes, const void *bits, int bits_wrap, int bits_size, const void *codes, int codes_wrap, int codes_size, const void *symbols, int symbols_wrap, int symbols_size, int flags)
Definition: bitstream.c:275
int Q[2][MPC_FRAME_SIZE]
Definition: mpc.h:61
int size
Definition: packet.h:364
static const uint8_t mpc8_q7_bits[2][MPC8_Q7_SIZE]
Definition: mpc8huff.h:474
int res[2]
Definition: mpc.h:46
AVLFG rnd
Definition: mpc.h:65
#define MPC8_DSCF0_SIZE
Definition: mpc8huff.h:69
static const uint8_t mpc8_q1_bits[MPC8_Q1_SIZE]
Definition: mpc8huff.h:156
static const uint8_t mpc8_q3_syms[MPC8_Q3_SIZE]
Definition: mpc8huff.h:336
int last_max_band
Definition: mpc.h:57
#define AV_CH_LAYOUT_STEREO
#define MPC8_Q8_SIZE
Definition: mpc8huff.h:497
AVCodec.
Definition: codec.h:190
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
#define MPC8_RES_SIZE
Definition: mpc8huff.h:120
static const uint8_t mpc8_q8_codes[2][MPC8_Q8_SIZE]
Definition: mpc8huff.h:501
static const uint8_t mpc8_q2_bits[2][MPC8_Q2_SIZE]
Definition: mpc8huff.h:275
#define MPC8_Q3_BITS
Definition: mpc8huff.h:315
#define MPC8_DSCF1_SIZE
Definition: mpc8huff.h:94
static const uint32_t mpc8_cnk_lost[16][33]
Definition: mpc8data.h:101
#define MPC8_Q6_BITS
Definition: mpc8huff.h:416
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1194
uint8_t
#define av_cold
Definition: attributes.h:88
#define MPC8_Q7_SIZE
Definition: mpc8huff.h:448
static const uint8_t mpc8_res_bits[2][MPC8_RES_SIZE]
Definition: mpc8huff.h:135
#define MPC8_Q1_BITS
Definition: mpc8huff.h:149
static const uint8_t mpc8_q5_bits[2][MPC8_Q5_SIZE]
Definition: mpc8huff.h:404
static VLC q3_vlc[2]
Definition: mpc8.c:40
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:627
static const uint8_t mpc8_dscf1_codes[MPC8_DSCF1_SIZE]
Definition: mpc8huff.h:97
static const uint8_t mpc8_scfi0_bits[MPC8_SCFI0_SIZE]
Definition: mpc8huff.h:51
#define MPC8_BANDS_SIZE
Definition: mpc8huff.h:27
int scf_idx[2][3]
Definition: mpc.h:48
#define MPC8_DSCF1_BITS
Definition: mpc8huff.h:95
uint8_t * data
Definition: packet.h:363
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:219
static const uint8_t mpc8_q1_codes[MPC8_Q1_SIZE]
Definition: mpc8huff.h:151
bitstream reader API header.
#define MPC8_SCFI0_BITS
Definition: mpc8huff.h:46
ptrdiff_t size
Definition: opengl_enc.c:100
channels
Definition: aptx.h:33
static const uint8_t mpc8_q8_bits[2][MPC8_Q8_SIZE]
Definition: mpc8huff.h:539
int last_bits_used
Definition: mpc.h:58
#define av_log(a,...)
static const uint16_t table[]
Definition: prosumer.c:206
static const int8_t mpc8_huffq2[5 *5 *5]
Definition: mpc8data.h:50
#define MPC8_Q9UP_SIZE
Definition: mpc8huff.h:162
#define U(x)
Definition: vp56_arith.h:37
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:849
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
#define MPC8_Q1_SIZE
Definition: mpc8huff.h:148
static const uint8_t mpc8_dscf0_codes[MPC8_DSCF0_SIZE]
Definition: mpc8huff.h:72
static const int8_t mpc8_idx50[125]
Definition: mpc8data.h:27
#define MPC8_Q5_SIZE
Definition: mpc8huff.h:390
static const uint16_t mask[17]
Definition: lzw.c:38
int cur_frame
Definition: mpc.h:62
#define init_vlc(vlc, nb_bits, nb_codes,bits, bits_wrap, bits_size,codes, codes_wrap, codes_size,flags)
Definition: vlc.h:38
static VLC dscf_vlc[2]
Definition: mpc8.c:39
static av_cold int mpc8_decode_init(AVCodecContext *avctx)
Definition: mpc8.c:96
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:153
static const uint8_t mpc8_q9up_bits[MPC8_Q9UP_SIZE]
Definition: mpc8huff.h:199
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:215
static VLC quant_vlc[4][2]
Definition: mpc8.c:40
const char * name
Name of the codec implementation.
Definition: codec.h:197
uint8_t bits
Definition: vp3data.h:202
int maxbands
Definition: mpc.h:57
#define SAMPLES_PER_BAND
Definition: mpc.h:40
#define MPC8_Q4_BITS
Definition: mpc8huff.h:347
Definition: vlc.h:26
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:1237
static const uint8_t mpc8_bands_bits[MPC8_BANDS_SIZE]
Definition: mpc8huff.h:37
#define MPC8_Q4_OFFSET
Definition: mpc8huff.h:348
#define MPC8_SCFI1_SIZE
Definition: mpc8huff.h:55
static const uint8_t mpc8_bands_codes[MPC8_BANDS_SIZE]
Definition: mpc8huff.h:30
static av_cold void mpc8_decode_flush(AVCodecContext *avctx)
Definition: mpc8.c:438
void ff_mpa_synth_init_fixed(void)
static const int8_t mpc8_idx51[125]
Definition: mpc8data.h:34
audio channel layout utility functions
#define MPC_FRAME_SIZE
Definition: mpc.h:41
static int mpc8_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
Definition: mpc8.c:238
#define FFMIN(a, b)
Definition: common.h:96
static int mpc8_get_mod_golomb(GetBitContext *gb, int m)
Definition: mpc8.c:75
static const uint8_t mpc8_dscf0_bits[MPC8_DSCF0_SIZE]
Definition: mpc8huff.h:82
static const uint8_t mpc8_q6_bits[2][MPC8_Q6_SIZE]
Definition: mpc8huff.h:433
#define MPC8_Q8_OFFSET
Definition: mpc8huff.h:499
AVCodec ff_mpc8_decoder
Definition: mpc8.c:444
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:72
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:797
#define MPC8_Q7_OFFSET
Definition: mpc8huff.h:450
static const uint8_t mpc8_q5_codes[2][MPC8_Q5_SIZE]
Definition: mpc8huff.h:394
static const uint8_t mpc8_cnk_len[16][33]
Definition: mpc8data.h:80
#define MPC8_Q6_SIZE
Definition: mpc8huff.h:415
static VLC q9up_vlc
Definition: mpc8.c:40
static const uint8_t mpc8_q3_codes[MPC8_Q3_SIZE]
Definition: mpc8huff.h:318
s EdgeDetect Foobar g libavfilter vf_edgedetect c libavfilter vf_foobar c edit libavfilter and add an entry for foobar following the pattern of the other filters edit libavfilter allfilters and add an entry for foobar following the pattern of the other filters configure make j< whatever > ffmpeg ffmpeg i you should get a foobar png with Lena edge detected That s your new playground is ready Some little details about what s going which in turn will define variables for the build system and the C
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
int table_allocated
Definition: vlc.h:29
static const uint8_t mpc8_dscf1_bits[MPC8_DSCF1_SIZE]
Definition: mpc8huff.h:108
Libavcodec external API header.
Musepack decoder MPEG Audio Layer 1/2 -like codec with frames of 1152 samples divided into 32 subband...
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
#define MPC8_Q7_BITS
Definition: mpc8huff.h:449
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:677
int scfi[2]
Definition: mpc.h:47
main external API structure.
Definition: avcodec.h:526
#define MPC8_Q5_OFFSET
Definition: mpc8huff.h:392
static const float bands[]
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1879
static unsigned int av_lfg_get(AVLFG *c)
Get the next random unsigned 32-bit number using an ALFG.
Definition: lfg.h:53
int extradata_size
Definition: avcodec.h:628
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:467
int oldDSCF[2][BANDS]
Definition: mpc.h:59
static VLC scfi_vlc[2]
Definition: mpc8.c:39
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:659
static const uint32_t mpc8_cnk[16][32]
Definition: mpc8data.h:60
static int mpc8_dec_base(GetBitContext *gb, int k, int n)
Definition: mpc8.c:45
#define MPC8_Q6_OFFSET
Definition: mpc8huff.h:417
av_cold void av_lfg_init(AVLFG *c, unsigned int seed)
Definition: lfg.c:32
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:546
static const uint16_t vlc_offsets[13]
Definition: mpc8.c:92
static const unsigned int mpc8_thres[]
Definition: mpc8data.h:49
static const uint8_t mpc8_q4_syms[MPC8_Q4_SIZE]
Definition: mpc8huff.h:376
static av_const int sign_extend(int val, unsigned bits)
Definition: mathops.h:130
#define BANDS
Definition: imc.c:52
and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some it can consider them to be part of the FIFO and delay acknowledging a status change accordingly Example code
#define MPC8_Q2_SIZE
Definition: mpc8huff.h:234
#define MPC8_SCFI1_BITS
Definition: mpc8huff.h:56
#define MPC8_Q9UP_BITS
Definition: mpc8huff.h:163
static const uint8_t mpc8_scfi1_codes[MPC8_SCFI1_SIZE]
Definition: mpc8huff.h:58
Band bands[BANDS]
Definition: mpc.h:60
static const int q3_offsets[2]
Definition: mpc8.c:42
common internal api header.
static const int8_t mpc8_idx52[125]
Definition: mpc8data.h:41
static const uint8_t mpc8_q9up_codes[MPC8_Q9UP_SIZE]
Definition: mpc8huff.h:165
#define MPC8_DSCF0_BITS
Definition: mpc8huff.h:70
#define INIT_VLC_USE_NEW_STATIC
Definition: vlc.h:60
#define MPC8_RES_BITS
Definition: mpc8huff.h:121
static const uint8_t mpc8_q2_codes[2][MPC8_Q2_SIZE]
Definition: mpc8huff.h:237
static VLC q1_vlc
Definition: mpc8.c:40
int MSS
Definition: mpc.h:55
void * priv_data
Definition: avcodec.h:553
static const uint8_t mpc8_res_codes[2][MPC8_RES_SIZE]
Definition: mpc8huff.h:123
int len
int channels
number of audio channels
Definition: avcodec.h:1187
static VLC res_vlc[2]
Definition: mpc8.c:39
int frames
Definition: mpc.h:62
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
#define MPC8_Q3_OFFSET
Definition: mpc8huff.h:316
static int mpc8_get_mask(GetBitContext *gb, int size, int t)
Definition: mpc8.c:81
static const uint8_t mpc8_q6_codes[2][MPC8_Q6_SIZE]
Definition: mpc8huff.h:419
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:940
static const uint8_t mpc8_q4_codes[MPC8_Q4_SIZE]
Definition: mpc8huff.h:350
static VLC band_vlc
Definition: mpc8.c:39
signed 16 bits, planar
Definition: samplefmt.h:67
#define MPC8_Q5_BITS
Definition: mpc8huff.h:391
#define VLC_TYPE
Definition: vlc.h:24
#define MPC8_Q4_SIZE
Definition: mpc8huff.h:346
#define MPC8_BANDS_BITS
Definition: mpc8huff.h:28
#define MPC8_Q3_SIZE
Definition: mpc8huff.h:314
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: frame.h:355
#define AV_CH_LAYOUT_MONO
Subband structure - hold all variables for each subband.
Definition: mpc.h:44
This structure stores compressed data.
Definition: packet.h:340
av_cold void ff_mpadsp_init(MPADSPContext *s)
Definition: mpegaudiodsp.c:81
static int mpc8_dec_enum(GetBitContext *gb, int k, int n)
Definition: mpc8.c:56
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:374
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:50
static const uint8_t mpc8_q7_codes[2][MPC8_Q7_SIZE]
Definition: mpc8huff.h:452
#define MPC8_Q2_BITS
Definition: mpc8huff.h:235
static const uint8_t mpc8_scfi0_codes[MPC8_SCFI0_SIZE]
Definition: mpc8huff.h:48
int i
Definition: input.c:407
Definition: mpc.h:52