FFmpeg
nellymoserenc.c
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1 /*
2  * Nellymoser encoder
3  * This code is developed as part of Google Summer of Code 2008 Program.
4  *
5  * Copyright (c) 2008 Bartlomiej Wolowiec
6  *
7  * This file is part of FFmpeg.
8  *
9  * FFmpeg is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2.1 of the License, or (at your option) any later version.
13  *
14  * FFmpeg is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with FFmpeg; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22  */
23 
24 /**
25  * @file
26  * Nellymoser encoder
27  * by Bartlomiej Wolowiec
28  *
29  * Generic codec information: libavcodec/nellymoserdec.c
30  *
31  * Some information also from: http://samples.mplayerhq.hu/A-codecs/Nelly_Moser/ASAO/ASAO.zip
32  * (Copyright Joseph Artsimovich and UAB "DKD")
33  *
34  * for more information about nellymoser format, visit:
35  * http://wiki.multimedia.cx/index.php?title=Nellymoser
36  */
37 
38 #include "libavutil/common.h"
39 #include "libavutil/float_dsp.h"
40 #include "libavutil/mathematics.h"
41 
42 #include "audio_frame_queue.h"
43 #include "avcodec.h"
44 #include "fft.h"
45 #include "internal.h"
46 #include "nellymoser.h"
47 #include "sinewin.h"
48 
49 #define BITSTREAM_WRITER_LE
50 #include "put_bits.h"
51 
52 #define POW_TABLE_SIZE (1<<11)
53 #define POW_TABLE_OFFSET 3
54 #define OPT_SIZE ((1<<15) + 3000)
55 
56 typedef struct NellyMoserEncodeContext {
64  DECLARE_ALIGNED(32, float, buf)[3 * NELLY_BUF_LEN]; ///< sample buffer
65  float (*opt )[OPT_SIZE];
68 
69 static float pow_table[POW_TABLE_SIZE]; ///< pow(2, -i / 2048.0 - 3.0);
70 
71 static const uint8_t sf_lut[96] = {
72  0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 4, 4,
73  5, 5, 5, 6, 7, 7, 8, 8, 9, 10, 11, 11, 12, 13, 13, 14,
74  15, 15, 16, 17, 17, 18, 19, 19, 20, 21, 22, 22, 23, 24, 25, 26,
75  27, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40,
76  41, 41, 42, 43, 44, 45, 45, 46, 47, 48, 49, 50, 51, 52, 52, 53,
77  54, 55, 55, 56, 57, 57, 58, 59, 59, 60, 60, 60, 61, 61, 61, 62,
78 };
79 
80 static const uint8_t sf_delta_lut[78] = {
81  0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 4, 4,
82  4, 5, 5, 5, 6, 6, 7, 7, 8, 8, 9, 10, 10, 11, 11, 12,
83  13, 13, 14, 15, 16, 17, 17, 18, 19, 19, 20, 21, 21, 22, 22, 23,
84  23, 24, 24, 25, 25, 25, 26, 26, 26, 26, 27, 27, 27, 27, 27, 28,
85  28, 28, 28, 28, 28, 29, 29, 29, 29, 29, 29, 29, 29, 30,
86 };
87 
88 static const uint8_t quant_lut[230] = {
89  0,
90 
91  0, 1, 2,
92 
93  0, 1, 2, 3, 4, 5, 6,
94 
95  0, 1, 1, 2, 2, 3, 3, 4, 5, 6, 7, 8, 9, 10, 11, 11,
96  12, 13, 13, 13, 14,
97 
98  0, 1, 1, 2, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 8,
99  8, 9, 10, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22,
100  22, 23, 23, 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 29, 29, 29,
101  30,
102 
103  0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 3,
104  4, 4, 4, 5, 5, 5, 6, 6, 7, 7, 7, 8, 8, 9, 9, 9,
105  10, 10, 11, 11, 11, 12, 12, 13, 13, 13, 13, 14, 14, 14, 15, 15,
106  15, 15, 16, 16, 16, 17, 17, 17, 18, 18, 18, 19, 19, 20, 20, 20,
107  21, 21, 22, 22, 23, 23, 24, 25, 26, 26, 27, 28, 29, 30, 31, 32,
108  33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 42, 43, 44, 44, 45, 45,
109  46, 47, 47, 48, 48, 49, 49, 50, 50, 50, 51, 51, 51, 52, 52, 52,
110  53, 53, 53, 54, 54, 54, 55, 55, 55, 56, 56, 56, 57, 57, 57, 57,
111  58, 58, 58, 58, 59, 59, 59, 59, 60, 60, 60, 60, 60, 61, 61, 61,
112  61, 61, 61, 61, 62,
113 };
114 
115 static const float quant_lut_mul[7] = { 0.0, 0.0, 2.0, 2.0, 5.0, 12.0, 36.6 };
116 static const float quant_lut_add[7] = { 0.0, 0.0, 2.0, 7.0, 21.0, 56.0, 157.0 };
117 static const uint8_t quant_lut_offset[8] = { 0, 0, 1, 4, 11, 32, 81, 230 };
118 
120 {
121  float *in0 = s->buf;
122  float *in1 = s->buf + NELLY_BUF_LEN;
123  float *in2 = s->buf + 2 * NELLY_BUF_LEN;
124 
125  s->fdsp->vector_fmul (s->in_buff, in0, ff_sine_128, NELLY_BUF_LEN);
126  s->fdsp->vector_fmul_reverse(s->in_buff + NELLY_BUF_LEN, in1, ff_sine_128, NELLY_BUF_LEN);
127  s->mdct_ctx.mdct_calc(&s->mdct_ctx, s->mdct_out, s->in_buff);
128 
129  s->fdsp->vector_fmul (s->in_buff, in1, ff_sine_128, NELLY_BUF_LEN);
130  s->fdsp->vector_fmul_reverse(s->in_buff + NELLY_BUF_LEN, in2, ff_sine_128, NELLY_BUF_LEN);
131  s->mdct_ctx.mdct_calc(&s->mdct_ctx, s->mdct_out + NELLY_BUF_LEN, s->in_buff);
132 }
133 
135 {
137 
138  ff_mdct_end(&s->mdct_ctx);
139 
140  if (s->avctx->trellis) {
141  av_freep(&s->opt);
142  av_freep(&s->path);
143  }
144  ff_af_queue_close(&s->afq);
145  av_freep(&s->fdsp);
146 
147  return 0;
148 }
149 
151 {
153  int i, ret;
154 
155  if (avctx->channels != 1) {
156  av_log(avctx, AV_LOG_ERROR, "Nellymoser supports only 1 channel\n");
157  return AVERROR(EINVAL);
158  }
159 
160  if (avctx->sample_rate != 8000 && avctx->sample_rate != 16000 &&
161  avctx->sample_rate != 11025 &&
162  avctx->sample_rate != 22050 && avctx->sample_rate != 44100 &&
164  av_log(avctx, AV_LOG_ERROR, "Nellymoser works only with 8000, 16000, 11025, 22050 and 44100 sample rate\n");
165  return AVERROR(EINVAL);
166  }
167 
168  avctx->frame_size = NELLY_SAMPLES;
170  ff_af_queue_init(avctx, &s->afq);
171  s->avctx = avctx;
172  if ((ret = ff_mdct_init(&s->mdct_ctx, 8, 0, 32768.0)) < 0)
173  goto error;
175  if (!s->fdsp) {
176  ret = AVERROR(ENOMEM);
177  goto error;
178  }
179 
180  /* Generate overlap window */
182  /* faster way of doing
183  for (i = 0; i < POW_TABLE_SIZE; i++)
184  pow_table[i] = 2^(-i / 2048.0 - 3.0 + POW_TABLE_OFFSET); */
185  pow_table[0] = 1;
186  pow_table[1024] = M_SQRT1_2;
187  for (i = 1; i < 513; i++) {
188  double tmp = exp2(-i / 2048.0);
189  pow_table[i] = tmp;
190  pow_table[1024-i] = M_SQRT1_2 / tmp;
191  pow_table[1024+i] = tmp * M_SQRT1_2;
192  pow_table[2048-i] = 0.5 / tmp;
193  }
194 
195  if (s->avctx->trellis) {
196  s->opt = av_malloc(NELLY_BANDS * OPT_SIZE * sizeof(float ));
197  s->path = av_malloc(NELLY_BANDS * OPT_SIZE * sizeof(uint8_t));
198  if (!s->opt || !s->path) {
199  ret = AVERROR(ENOMEM);
200  goto error;
201  }
202  }
203 
204  return 0;
205 error:
206  encode_end(avctx);
207  return ret;
208 }
209 
210 #define find_best(val, table, LUT, LUT_add, LUT_size) \
211  best_idx = \
212  LUT[av_clip ((lrintf(val) >> 8) + LUT_add, 0, LUT_size - 1)]; \
213  if (fabs(val - table[best_idx]) > fabs(val - table[best_idx + 1])) \
214  best_idx++;
215 
216 static void get_exponent_greedy(NellyMoserEncodeContext *s, float *cand, int *idx_table)
217 {
218  int band, best_idx, power_idx = 0;
219  float power_candidate;
220 
221  //base exponent
222  find_best(cand[0], ff_nelly_init_table, sf_lut, -20, 96);
223  idx_table[0] = best_idx;
224  power_idx = ff_nelly_init_table[best_idx];
225 
226  for (band = 1; band < NELLY_BANDS; band++) {
227  power_candidate = cand[band] - power_idx;
228  find_best(power_candidate, ff_nelly_delta_table, sf_delta_lut, 37, 78);
229  idx_table[band] = best_idx;
230  power_idx += ff_nelly_delta_table[best_idx];
231  }
232 }
233 
234 static inline float distance(float x, float y, int band)
235 {
236  //return pow(fabs(x-y), 2.0);
237  float tmp = x - y;
238  return tmp * tmp;
239 }
240 
241 static void get_exponent_dynamic(NellyMoserEncodeContext *s, float *cand, int *idx_table)
242 {
243  int i, j, band, best_idx;
244  float power_candidate, best_val;
245 
246  float (*opt )[OPT_SIZE] = s->opt ;
247  uint8_t(*path)[OPT_SIZE] = s->path;
248 
249  for (i = 0; i < NELLY_BANDS * OPT_SIZE; i++) {
250  opt[0][i] = INFINITY;
251  }
252 
253  for (i = 0; i < 64; i++) {
254  opt[0][ff_nelly_init_table[i]] = distance(cand[0], ff_nelly_init_table[i], 0);
255  path[0][ff_nelly_init_table[i]] = i;
256  }
257 
258  for (band = 1; band < NELLY_BANDS; band++) {
259  int q, c = 0;
260  float tmp;
261  int idx_min, idx_max, idx;
262  power_candidate = cand[band];
263  for (q = 1000; !c && q < OPT_SIZE; q <<= 2) {
264  idx_min = FFMAX(0, cand[band] - q);
265  idx_max = FFMIN(OPT_SIZE, cand[band - 1] + q);
266  for (i = FFMAX(0, cand[band - 1] - q); i < FFMIN(OPT_SIZE, cand[band - 1] + q); i++) {
267  if ( isinf(opt[band - 1][i]) )
268  continue;
269  for (j = 0; j < 32; j++) {
270  idx = i + ff_nelly_delta_table[j];
271  if (idx > idx_max)
272  break;
273  if (idx >= idx_min) {
274  tmp = opt[band - 1][i] + distance(idx, power_candidate, band);
275  if (opt[band][idx] > tmp) {
276  opt[band][idx] = tmp;
277  path[band][idx] = j;
278  c = 1;
279  }
280  }
281  }
282  }
283  }
284  av_assert1(c); //FIXME
285  }
286 
287  best_val = INFINITY;
288  best_idx = -1;
289  band = NELLY_BANDS - 1;
290  for (i = 0; i < OPT_SIZE; i++) {
291  if (best_val > opt[band][i]) {
292  best_val = opt[band][i];
293  best_idx = i;
294  }
295  }
296  for (band = NELLY_BANDS - 1; band >= 0; band--) {
297  idx_table[band] = path[band][best_idx];
298  if (band) {
299  best_idx -= ff_nelly_delta_table[path[band][best_idx]];
300  }
301  }
302 }
303 
304 /**
305  * Encode NELLY_SAMPLES samples. It assumes, that samples contains 3 * NELLY_BUF_LEN values
306  * @param s encoder context
307  * @param output output buffer
308  * @param output_size size of output buffer
309  */
310 static void encode_block(NellyMoserEncodeContext *s, unsigned char *output, int output_size)
311 {
312  PutBitContext pb;
313  int i, j, band, block, best_idx, power_idx = 0;
314  float power_val, coeff, coeff_sum;
315  float pows[NELLY_FILL_LEN];
316  int bits[NELLY_BUF_LEN], idx_table[NELLY_BANDS];
317  float cand[NELLY_BANDS];
318 
319  apply_mdct(s);
320 
321  init_put_bits(&pb, output, output_size);
322 
323  i = 0;
324  for (band = 0; band < NELLY_BANDS; band++) {
325  coeff_sum = 0;
326  for (j = 0; j < ff_nelly_band_sizes_table[band]; i++, j++) {
327  coeff_sum += s->mdct_out[i ] * s->mdct_out[i ]
328  + s->mdct_out[i + NELLY_BUF_LEN] * s->mdct_out[i + NELLY_BUF_LEN];
329  }
330  cand[band] =
331  log2(FFMAX(1.0, coeff_sum / (ff_nelly_band_sizes_table[band] << 7))) * 1024.0;
332  }
333 
334  if (s->avctx->trellis) {
335  get_exponent_dynamic(s, cand, idx_table);
336  } else {
337  get_exponent_greedy(s, cand, idx_table);
338  }
339 
340  i = 0;
341  for (band = 0; band < NELLY_BANDS; band++) {
342  if (band) {
343  power_idx += ff_nelly_delta_table[idx_table[band]];
344  put_bits(&pb, 5, idx_table[band]);
345  } else {
346  power_idx = ff_nelly_init_table[idx_table[0]];
347  put_bits(&pb, 6, idx_table[0]);
348  }
349  power_val = pow_table[power_idx & 0x7FF] / (1 << ((power_idx >> 11) + POW_TABLE_OFFSET));
350  for (j = 0; j < ff_nelly_band_sizes_table[band]; i++, j++) {
351  s->mdct_out[i] *= power_val;
352  s->mdct_out[i + NELLY_BUF_LEN] *= power_val;
353  pows[i] = power_idx;
354  }
355  }
356 
358 
359  for (block = 0; block < 2; block++) {
360  for (i = 0; i < NELLY_FILL_LEN; i++) {
361  if (bits[i] > 0) {
362  const float *table = ff_nelly_dequantization_table + (1 << bits[i]) - 1;
363  coeff = s->mdct_out[block * NELLY_BUF_LEN + i];
364  best_idx =
365  quant_lut[av_clip (
368  quant_lut_offset[bits[i]+1] - 1
369  )];
370  if (fabs(coeff - table[best_idx]) > fabs(coeff - table[best_idx + 1]))
371  best_idx++;
372 
373  put_bits(&pb, bits[i], best_idx);
374  }
375  }
376  if (!block)
378  }
379 
380  flush_put_bits(&pb);
381  memset(put_bits_ptr(&pb), 0, output + output_size - put_bits_ptr(&pb));
382 }
383 
384 static int encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
385  const AVFrame *frame, int *got_packet_ptr)
386 {
388  int ret;
389 
390  if (s->last_frame)
391  return 0;
392 
393  memcpy(s->buf, s->buf + NELLY_SAMPLES, NELLY_BUF_LEN * sizeof(*s->buf));
394  if (frame) {
395  memcpy(s->buf + NELLY_BUF_LEN, frame->data[0],
396  frame->nb_samples * sizeof(*s->buf));
397  if (frame->nb_samples < NELLY_SAMPLES) {
398  memset(s->buf + NELLY_BUF_LEN + frame->nb_samples, 0,
399  (NELLY_SAMPLES - frame->nb_samples) * sizeof(*s->buf));
400  if (frame->nb_samples >= NELLY_BUF_LEN)
401  s->last_frame = 1;
402  }
403  if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)
404  return ret;
405  } else {
406  memset(s->buf + NELLY_BUF_LEN, 0, NELLY_SAMPLES * sizeof(*s->buf));
407  s->last_frame = 1;
408  }
409 
410  if ((ret = ff_alloc_packet2(avctx, avpkt, NELLY_BLOCK_LEN, 0)) < 0)
411  return ret;
412  encode_block(s, avpkt->data, avpkt->size);
413 
414  /* Get the next frame pts/duration */
415  ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
416  &avpkt->duration);
417 
418  *got_packet_ptr = 1;
419  return 0;
420 }
421 
423  .name = "nellymoser",
424  .long_name = NULL_IF_CONFIG_SMALL("Nellymoser Asao"),
425  .type = AVMEDIA_TYPE_AUDIO,
427  .priv_data_size = sizeof(NellyMoserEncodeContext),
428  .init = encode_init,
429  .encode2 = encode_frame,
430  .close = encode_end,
432  .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLT,
434 };
error
static void error(const char *err)
Definition: target_bsf_fuzzer.c:29
NellyMoserEncodeContext::fdsp
AVFloatDSPContext * fdsp
Definition: nellymoserenc.c:59
quant_lut_mul
static const float quant_lut_mul[7]
Definition: nellymoserenc.c:115
AVCodecContext::frame_size
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:1206
AVCodec
AVCodec.
Definition: codec.h:190
NELLY_HEADER_BITS
#define NELLY_HEADER_BITS
Definition: nellymoser.h:41
INFINITY
#define INFINITY
Definition: mathematics.h:67
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
ff_init_ff_sine_windows
void AAC_RENAME() ff_init_ff_sine_windows(int index)
initialize the specified entry of ff_sine_windows
Definition: sinewin_tablegen.h:76
quant_lut_add
static const float quant_lut_add[7]
Definition: nellymoserenc.c:116
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
pow_table
static float pow_table[POW_TABLE_SIZE]
pow(2, -i / 2048.0 - 3.0);
Definition: nellymoserenc.c:69
ff_af_queue_remove
void ff_af_queue_remove(AudioFrameQueue *afq, int nb_samples, int64_t *pts, int64_t *duration)
Remove frame(s) from the queue.
Definition: audio_frame_queue.c:75
encode_init
static av_cold int encode_init(AVCodecContext *avctx)
Definition: nellymoserenc.c:150
AVCodecContext::sample_rate
int sample_rate
samples per second
Definition: avcodec.h:1186
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void ff_af_queue_close(AudioFrameQueue *afq)
Close AudioFrameQueue.
Definition: audio_frame_queue.c:36
sample_fmts
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:716
nellymoser.h
output
filter_frame For filters that do not use the this method is called when a frame is pushed to the filter s input It can be called at any time except in a reentrant way If the input frame is enough to produce output
Definition: filter_design.txt:225
init_put_bits
static void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
Initialize the PutBitContext s.
Definition: put_bits.h:48
ff_af_queue_init
av_cold void ff_af_queue_init(AVCodecContext *avctx, AudioFrameQueue *afq)
Initialize AudioFrameQueue.
Definition: audio_frame_queue.c:28
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static void get_exponent_greedy(NellyMoserEncodeContext *s, float *cand, int *idx_table)
Definition: nellymoserenc.c:216
NELLY_FILL_LEN
#define NELLY_FILL_LEN
Definition: nellymoser.h:44
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This structure describes decoded (raw) audio or video data.
Definition: frame.h:300
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static void put_bits(Jpeg2000EncoderContext *s, int val, int n)
put n times val bit
Definition: j2kenc.c:208
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static uint8_t tmp[11]
Definition: aes_ctr.c:26
internal.h
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uint8_t * data
Definition: packet.h:355
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float(* opt)[OPT_SIZE]
Definition: nellymoserenc.c:65
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static const uint16_t table[]
Definition: prosumer.c:206
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#define NELLY_BLOCK_LEN
Definition: nellymoser.h:40
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#define ff_mdct_init
Definition: fft.h:169
NellyMoserEncodeContext::in_buff
float in_buff[NELLY_SAMPLES]
Definition: nellymoserenc.c:63
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:373
mathematics.h
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uint8_t(* path)[OPT_SIZE]
Definition: nellymoserenc.c:66
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#define av_malloc(s)
Definition: tableprint_vlc.h:31
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Definition: nellymoser.c:66
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Definition: avcodec.h:2060
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Definition: nellymoserenc.c:422
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int flags
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Definition: avcodec.h:606
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int ff_af_queue_add(AudioFrameQueue *afq, const AVFrame *f)
Add a frame to the queue.
Definition: audio_frame_queue.c:44
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const float ff_nelly_dequantization_table[127]
Definition: nellymoser.c:39
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Definition: nellymoserenc.c:56
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#define POW_TABLE_SIZE
Definition: nellymoserenc.c:52
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#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
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#define av_cold
Definition: attributes.h:90
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float buf[3 *NELLY_BUF_LEN]
sample buffer
Definition: nellymoserenc.c:64
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#define s(width, name)
Definition: cbs_vp9.c:257
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#define POW_TABLE_OFFSET
Definition: nellymoserenc.c:53
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@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
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#define NELLY_BANDS
Definition: nellymoser.h:39
bits
uint8_t bits
Definition: vp3data.h:202
encode_block
static void encode_block(NellyMoserEncodeContext *s, unsigned char *output, int output_size)
Encode NELLY_SAMPLES samples.
Definition: nellymoserenc.c:310
AudioFrameQueue
Definition: audio_frame_queue.h:32
sf_lut
static const uint8_t sf_lut[96]
Definition: nellymoserenc.c:71
ff_nelly_init_table
const uint16_t ff_nelly_init_table[64]
Definition: nellymoser.c:70
PutBitContext
Definition: put_bits.h:35
ff_nelly_delta_table
const int16_t ff_nelly_delta_table[32]
Definition: nellymoser.c:79
NELLY_DETAIL_BITS
#define NELLY_DETAIL_BITS
Definition: nellymoser.h:42
quant_lut_offset
static const uint8_t quant_lut_offset[8]
Definition: nellymoserenc.c:117
isinf
#define isinf(x)
Definition: libm.h:317
NellyMoserEncodeContext::mdct_ctx
FFTContext mdct_ctx
Definition: nellymoserenc.c:60
c
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
float_dsp.h
sf_delta_lut
static const uint8_t sf_delta_lut[78]
Definition: nellymoserenc.c:80
AVPacket::size
int size
Definition: packet.h:356
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:188
find_best
#define find_best(val, table, LUT, LUT_add, LUT_size)
Definition: nellymoserenc.c:210
FFMAX
#define FFMAX(a, b)
Definition: common.h:94
AV_SAMPLE_FMT_NONE
@ AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:59
ff_mdct_end
#define ff_mdct_end
Definition: fft.h:170
NELLY_BUF_LEN
#define NELLY_BUF_LEN
Definition: nellymoser.h:43
AVFloatDSPContext
Definition: float_dsp.h:24
FFMIN
#define FFMIN(a, b)
Definition: common.h:96
sinewin.h
FF_COMPLIANCE_NORMAL
#define FF_COMPLIANCE_NORMAL
Definition: avcodec.h:1592
NELLY_SAMPLES
#define NELLY_SAMPLES
Definition: nellymoser.h:48
AVCodecContext::channels
int channels
number of audio channels
Definition: avcodec.h:1187
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Definition: mem.h:112
NellyMoserEncodeContext::avctx
AVCodecContext * avctx
Definition: nellymoserenc.c:57
FFTContext
Definition: fft.h:88
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:348
put_bits_count
static int put_bits_count(PutBitContext *s)
Definition: put_bits.h:67
common.h
av_assert1
#define av_assert1(cond)
assert() equivalent, that does not lie in speed critical code.
Definition: avassert.h:53
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
exp2
#define exp2(x)
Definition: libm.h:288
uint8_t
uint8_t
Definition: audio_convert.c:194
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:197
log2
#define log2(x)
Definition: libm.h:404
avcodec.h
ret
ret
Definition: filter_design.txt:187
frame
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
Definition: filter_design.txt:264
NellyMoserEncodeContext::afq
AudioFrameQueue afq
Definition: nellymoserenc.c:61
AVCodecContext::strict_std_compliance
int strict_std_compliance
strictly follow the standard (MPEG-4, ...).
Definition: avcodec.h:1589
M_SQRT1_2
#define M_SQRT1_2
Definition: mathematics.h:58
fft.h
AVCodecContext
main external API structure.
Definition: avcodec.h:526
put_bits_ptr
static uint8_t * put_bits_ptr(PutBitContext *s)
Return the pointer to the byte where the bitstream writer will put the next bit.
Definition: put_bits.h:324
NellyMoserEncodeContext::mdct_out
float mdct_out[NELLY_SAMPLES]
Definition: nellymoserenc.c:62
OPT_SIZE
#define OPT_SIZE
Definition: nellymoserenc.c:54
AV_CODEC_CAP_DELAY
#define AV_CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
Definition: codec.h:75
encode_end
static av_cold int encode_end(AVCodecContext *avctx)
Definition: nellymoserenc.c:134
AV_CODEC_FLAG_BITEXACT
#define AV_CODEC_FLAG_BITEXACT
Use only bitexact stuff (except (I)DCT).
Definition: avcodec.h:333
encode_frame
static int encode_frame(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Definition: nellymoserenc.c:384
flush_put_bits
static void flush_put_bits(PutBitContext *s)
Pad the end of the output stream with zeros.
Definition: put_bits.h:101
quant_lut
static const uint8_t quant_lut[230]
Definition: nellymoserenc.c:88
get_exponent_dynamic
static void get_exponent_dynamic(NellyMoserEncodeContext *s, float *cand, int *idx_table)
Definition: nellymoserenc.c:241
AVPacket
This structure stores compressed data.
Definition: packet.h:332
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:553
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
avpriv_float_dsp_alloc
av_cold AVFloatDSPContext * avpriv_float_dsp_alloc(int bit_exact)
Allocate a float DSP context.
Definition: float_dsp.c:135
apply_mdct
static void apply_mdct(NellyMoserEncodeContext *s)
Definition: nellymoserenc.c:119
distance
static float distance(float x, float y, int band)
Definition: nellymoserenc.c:234
coeff
static const double coeff[2][5]
Definition: vf_owdenoise.c:72
block
The exact code depends on how similar the blocks are and how related they are to the block
Definition: filter_design.txt:207
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AV_CODEC_CAP_SMALL_LAST_FRAME
#define AV_CODEC_CAP_SMALL_LAST_FRAME
Codec can be fed a final frame with a smaller size.
Definition: codec.h:80
ff_alloc_packet2
int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int64_t min_size)
Check AVPacket size and/or allocate data.
Definition: encode.c:32
put_bits.h
AV_SAMPLE_FMT_FLT
@ AV_SAMPLE_FMT_FLT
float
Definition: samplefmt.h:63
NellyMoserEncodeContext::last_frame
int last_frame
Definition: nellymoserenc.c:58
AV_CODEC_ID_NELLYMOSER
@ AV_CODEC_ID_NELLYMOSER
Definition: codec_id.h:443
ff_nelly_get_sample_bits
void ff_nelly_get_sample_bits(const float *buf, int *bits)
Definition: nellymoser.c:116