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alac.c
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1 /*
2  * ALAC (Apple Lossless Audio Codec) decoder
3  * Copyright (c) 2005 David Hammerton
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  * ALAC (Apple Lossless Audio Codec) decoder
25  * @author 2005 David Hammerton
26  * @see http://crazney.net/programs/itunes/alac.html
27  *
28  * Note: This decoder expects a 36-byte QuickTime atom to be
29  * passed through the extradata[_size] fields. This atom is tacked onto
30  * the end of an 'alac' stsd atom and has the following format:
31  *
32  * 32bit atom size
33  * 32bit tag ("alac")
34  * 32bit tag version (0)
35  * 32bit samples per frame (used when not set explicitly in the frames)
36  * 8bit compatible version (0)
37  * 8bit sample size
38  * 8bit history mult (40)
39  * 8bit initial history (10)
40  * 8bit rice param limit (14)
41  * 8bit channels
42  * 16bit maxRun (255)
43  * 32bit max coded frame size (0 means unknown)
44  * 32bit average bitrate (0 means unknown)
45  * 32bit samplerate
46  */
47 
48 #include <inttypes.h>
49 
51 #include "libavutil/opt.h"
52 #include "avcodec.h"
53 #include "get_bits.h"
54 #include "bytestream.h"
55 #include "internal.h"
56 #include "thread.h"
57 #include "unary.h"
58 #include "mathops.h"
59 #include "alac_data.h"
60 
61 #define ALAC_EXTRADATA_SIZE 36
62 
63 typedef struct ALACContext {
64  AVClass *class;
67  int channels;
68 
72 
78 
79  int extra_bits; /**< number of extra bits beyond 16-bit */
80  int nb_samples; /**< number of samples in the current frame */
81 
84 } ALACContext;
85 
86 static inline unsigned int decode_scalar(GetBitContext *gb, int k, int bps)
87 {
88  unsigned int x = get_unary_0_9(gb);
89 
90  if (x > 8) { /* RICE THRESHOLD */
91  /* use alternative encoding */
92  x = get_bits_long(gb, bps);
93  } else if (k != 1) {
94  int extrabits = show_bits(gb, k);
95 
96  /* multiply x by 2^k - 1, as part of their strange algorithm */
97  x = (x << k) - x;
98 
99  if (extrabits > 1) {
100  x += extrabits - 1;
101  skip_bits(gb, k);
102  } else
103  skip_bits(gb, k - 1);
104  }
105  return x;
106 }
107 
108 static int rice_decompress(ALACContext *alac, int32_t *output_buffer,
109  int nb_samples, int bps, int rice_history_mult)
110 {
111  int i;
112  unsigned int history = alac->rice_initial_history;
113  int sign_modifier = 0;
114 
115  for (i = 0; i < nb_samples; i++) {
116  int k;
117  unsigned int x;
118 
119  if(get_bits_left(&alac->gb) <= 0)
120  return -1;
121 
122  /* calculate rice param and decode next value */
123  k = av_log2((history >> 9) + 3);
124  k = FFMIN(k, alac->rice_limit);
125  x = decode_scalar(&alac->gb, k, bps);
126  x += sign_modifier;
127  sign_modifier = 0;
128  output_buffer[i] = (x >> 1) ^ -(x & 1);
129 
130  /* update the history */
131  if (x > 0xffff)
132  history = 0xffff;
133  else
134  history += x * rice_history_mult -
135  ((history * rice_history_mult) >> 9);
136 
137  /* special case: there may be compressed blocks of 0 */
138  if ((history < 128) && (i + 1 < nb_samples)) {
139  int block_size;
140 
141  /* calculate rice param and decode block size */
142  k = 7 - av_log2(history) + ((history + 16) >> 6);
143  k = FFMIN(k, alac->rice_limit);
144  block_size = decode_scalar(&alac->gb, k, 16);
145 
146  if (block_size > 0) {
147  if (block_size >= nb_samples - i) {
148  av_log(alac->avctx, AV_LOG_ERROR,
149  "invalid zero block size of %d %d %d\n", block_size,
150  nb_samples, i);
151  block_size = nb_samples - i - 1;
152  }
153  memset(&output_buffer[i + 1], 0,
154  block_size * sizeof(*output_buffer));
155  i += block_size;
156  }
157  if (block_size <= 0xffff)
158  sign_modifier = 1;
159  history = 0;
160  }
161  }
162  return 0;
163 }
164 
165 static inline int sign_only(int v)
166 {
167  return v ? FFSIGN(v) : 0;
168 }
169 
170 static void lpc_prediction(int32_t *error_buffer, int32_t *buffer_out,
171  int nb_samples, int bps, int16_t *lpc_coefs,
172  int lpc_order, int lpc_quant)
173 {
174  int i;
175  int32_t *pred = buffer_out;
176 
177  /* first sample always copies */
178  *buffer_out = *error_buffer;
179 
180  if (nb_samples <= 1)
181  return;
182 
183  if (!lpc_order) {
184  memcpy(&buffer_out[1], &error_buffer[1],
185  (nb_samples - 1) * sizeof(*buffer_out));
186  return;
187  }
188 
189  if (lpc_order == 31) {
190  /* simple 1st-order prediction */
191  for (i = 1; i < nb_samples; i++) {
192  buffer_out[i] = sign_extend(buffer_out[i - 1] + error_buffer[i],
193  bps);
194  }
195  return;
196  }
197 
198  /* read warm-up samples */
199  for (i = 1; i <= lpc_order && i < nb_samples; i++)
200  buffer_out[i] = sign_extend(buffer_out[i - 1] + error_buffer[i], bps);
201 
202  /* NOTE: 4 and 8 are very common cases that could be optimized. */
203 
204  for (; i < nb_samples; i++) {
205  int j;
206  int val = 0;
207  int error_val = error_buffer[i];
208  int error_sign;
209  int d = *pred++;
210 
211  /* LPC prediction */
212  for (j = 0; j < lpc_order; j++)
213  val += (pred[j] - d) * lpc_coefs[j];
214  val = (val + (1 << (lpc_quant - 1))) >> lpc_quant;
215  val += d + error_val;
216  buffer_out[i] = sign_extend(val, bps);
217 
218  /* adapt LPC coefficients */
219  error_sign = sign_only(error_val);
220  if (error_sign) {
221  for (j = 0; j < lpc_order && error_val * error_sign > 0; j++) {
222  int sign;
223  val = d - pred[j];
224  sign = sign_only(val) * error_sign;
225  lpc_coefs[j] -= sign;
226  val *= sign;
227  error_val -= (val >> lpc_quant) * (j + 1);
228  }
229  }
230  }
231 }
232 
233 static void decorrelate_stereo(int32_t *buffer[2], int nb_samples,
234  int decorr_shift, int decorr_left_weight)
235 {
236  int i;
237 
238  for (i = 0; i < nb_samples; i++) {
239  int32_t a, b;
240 
241  a = buffer[0][i];
242  b = buffer[1][i];
243 
244  a -= (b * decorr_left_weight) >> decorr_shift;
245  b += a;
246 
247  buffer[0][i] = b;
248  buffer[1][i] = a;
249  }
250 }
251 
252 static void append_extra_bits(int32_t *buffer[2], int32_t *extra_bits_buffer[2],
253  int extra_bits, int channels, int nb_samples)
254 {
255  int i, ch;
256 
257  for (ch = 0; ch < channels; ch++)
258  for (i = 0; i < nb_samples; i++)
259  buffer[ch][i] = (buffer[ch][i] << extra_bits) | extra_bits_buffer[ch][i];
260 }
261 
262 static int decode_element(AVCodecContext *avctx, AVFrame *frame, int ch_index,
263  int channels)
264 {
265  ALACContext *alac = avctx->priv_data;
266  int has_size, bps, is_compressed, decorr_shift, decorr_left_weight, ret;
267  uint32_t output_samples;
268  int i, ch;
269 
270  skip_bits(&alac->gb, 4); /* element instance tag */
271  skip_bits(&alac->gb, 12); /* unused header bits */
272 
273  /* the number of output samples is stored in the frame */
274  has_size = get_bits1(&alac->gb);
275 
276  alac->extra_bits = get_bits(&alac->gb, 2) << 3;
277  bps = alac->sample_size - alac->extra_bits + channels - 1;
278  if (bps > 32U) {
279  av_log(avctx, AV_LOG_ERROR, "bps is unsupported: %d\n", bps);
280  return AVERROR_PATCHWELCOME;
281  }
282 
283  /* whether the frame is compressed */
284  is_compressed = !get_bits1(&alac->gb);
285 
286  if (has_size)
287  output_samples = get_bits_long(&alac->gb, 32);
288  else
289  output_samples = alac->max_samples_per_frame;
290  if (!output_samples || output_samples > alac->max_samples_per_frame) {
291  av_log(avctx, AV_LOG_ERROR, "invalid samples per frame: %"PRIu32"\n",
292  output_samples);
293  return AVERROR_INVALIDDATA;
294  }
295  if (!alac->nb_samples) {
296  ThreadFrame tframe = { .f = frame };
297  /* get output buffer */
298  frame->nb_samples = output_samples;
299  if ((ret = ff_thread_get_buffer(avctx, &tframe, 0)) < 0)
300  return ret;
301  } else if (output_samples != alac->nb_samples) {
302  av_log(avctx, AV_LOG_ERROR, "sample count mismatch: %"PRIu32" != %d\n",
303  output_samples, alac->nb_samples);
304  return AVERROR_INVALIDDATA;
305  }
306  alac->nb_samples = output_samples;
307  if (alac->direct_output) {
308  for (ch = 0; ch < channels; ch++)
309  alac->output_samples_buffer[ch] = (int32_t *)frame->extended_data[ch_index + ch];
310  }
311 
312  if (is_compressed) {
313  int16_t lpc_coefs[2][32];
314  int lpc_order[2];
315  int prediction_type[2];
316  int lpc_quant[2];
317  int rice_history_mult[2];
318 
319  if (!alac->rice_limit) {
321  "Compression with rice limit 0");
322  return AVERROR(ENOSYS);
323  }
324 
325  decorr_shift = get_bits(&alac->gb, 8);
326  decorr_left_weight = get_bits(&alac->gb, 8);
327 
328  for (ch = 0; ch < channels; ch++) {
329  prediction_type[ch] = get_bits(&alac->gb, 4);
330  lpc_quant[ch] = get_bits(&alac->gb, 4);
331  rice_history_mult[ch] = get_bits(&alac->gb, 3);
332  lpc_order[ch] = get_bits(&alac->gb, 5);
333 
334  if (lpc_order[ch] >= alac->max_samples_per_frame)
335  return AVERROR_INVALIDDATA;
336 
337  /* read the predictor table */
338  for (i = lpc_order[ch] - 1; i >= 0; i--)
339  lpc_coefs[ch][i] = get_sbits(&alac->gb, 16);
340  }
341 
342  if (alac->extra_bits) {
343  for (i = 0; i < alac->nb_samples; i++) {
344  if(get_bits_left(&alac->gb) <= 0)
345  return -1;
346  for (ch = 0; ch < channels; ch++)
347  alac->extra_bits_buffer[ch][i] = get_bits(&alac->gb, alac->extra_bits);
348  }
349  }
350  for (ch = 0; ch < channels; ch++) {
351  int ret=rice_decompress(alac, alac->predict_error_buffer[ch],
352  alac->nb_samples, bps,
353  rice_history_mult[ch] * alac->rice_history_mult / 4);
354  if(ret<0)
355  return ret;
356 
357  /* adaptive FIR filter */
358  if (prediction_type[ch] == 15) {
359  /* Prediction type 15 runs the adaptive FIR twice.
360  * The first pass uses the special-case coef_num = 31, while
361  * the second pass uses the coefs from the bitstream.
362  *
363  * However, this prediction type is not currently used by the
364  * reference encoder.
365  */
367  alac->predict_error_buffer[ch],
368  alac->nb_samples, bps, NULL, 31, 0);
369  } else if (prediction_type[ch] > 0) {
370  av_log(avctx, AV_LOG_WARNING, "unknown prediction type: %i\n",
371  prediction_type[ch]);
372  }
374  alac->output_samples_buffer[ch], alac->nb_samples,
375  bps, lpc_coefs[ch], lpc_order[ch], lpc_quant[ch]);
376  }
377  } else {
378  /* not compressed, easy case */
379  for (i = 0; i < alac->nb_samples; i++) {
380  if(get_bits_left(&alac->gb) <= 0)
381  return -1;
382  for (ch = 0; ch < channels; ch++) {
383  alac->output_samples_buffer[ch][i] =
384  get_sbits_long(&alac->gb, alac->sample_size);
385  }
386  }
387  alac->extra_bits = 0;
388  decorr_shift = 0;
389  decorr_left_weight = 0;
390  }
391 
392  if (alac->extra_bits && alac->extra_bit_bug) {
394  alac->extra_bits, channels, alac->nb_samples);
395  }
396 
397  if (channels == 2 && decorr_left_weight) {
399  decorr_shift, decorr_left_weight);
400  }
401 
402  if (alac->extra_bits && !alac->extra_bit_bug) {
404  alac->extra_bits, channels, alac->nb_samples);
405  }
406 
407  if(av_sample_fmt_is_planar(avctx->sample_fmt)) {
408  switch(alac->sample_size) {
409  case 16: {
410  for (ch = 0; ch < channels; ch++) {
411  int16_t *outbuffer = (int16_t *)frame->extended_data[ch_index + ch];
412  for (i = 0; i < alac->nb_samples; i++)
413  *outbuffer++ = alac->output_samples_buffer[ch][i];
414  }}
415  break;
416  case 24: {
417  for (ch = 0; ch < channels; ch++) {
418  for (i = 0; i < alac->nb_samples; i++)
419  alac->output_samples_buffer[ch][i] <<= 8;
420  }}
421  break;
422  }
423  }else{
424  switch(alac->sample_size) {
425  case 16: {
426  int16_t *outbuffer = ((int16_t *)frame->extended_data[0]) + ch_index;
427  for (i = 0; i < alac->nb_samples; i++) {
428  for (ch = 0; ch < channels; ch++)
429  *outbuffer++ = alac->output_samples_buffer[ch][i];
430  outbuffer += alac->channels - channels;
431  }
432  }
433  break;
434  case 24: {
435  int32_t *outbuffer = ((int32_t *)frame->extended_data[0]) + ch_index;
436  for (i = 0; i < alac->nb_samples; i++) {
437  for (ch = 0; ch < channels; ch++)
438  *outbuffer++ = alac->output_samples_buffer[ch][i] << 8;
439  outbuffer += alac->channels - channels;
440  }
441  }
442  break;
443  case 32: {
444  int32_t *outbuffer = ((int32_t *)frame->extended_data[0]) + ch_index;
445  for (i = 0; i < alac->nb_samples; i++) {
446  for (ch = 0; ch < channels; ch++)
447  *outbuffer++ = alac->output_samples_buffer[ch][i];
448  outbuffer += alac->channels - channels;
449  }
450  }
451  break;
452  }
453  }
454 
455  return 0;
456 }
457 
458 static int alac_decode_frame(AVCodecContext *avctx, void *data,
459  int *got_frame_ptr, AVPacket *avpkt)
460 {
461  ALACContext *alac = avctx->priv_data;
462  AVFrame *frame = data;
463  enum AlacRawDataBlockType element;
464  int channels;
465  int ch, ret, got_end;
466 
467  if ((ret = init_get_bits8(&alac->gb, avpkt->data, avpkt->size)) < 0)
468  return ret;
469 
470  got_end = 0;
471  alac->nb_samples = 0;
472  ch = 0;
473  while (get_bits_left(&alac->gb) >= 3) {
474  element = get_bits(&alac->gb, 3);
475  if (element == TYPE_END) {
476  got_end = 1;
477  break;
478  }
479  if (element > TYPE_CPE && element != TYPE_LFE) {
480  av_log(avctx, AV_LOG_ERROR, "syntax element unsupported: %d\n", element);
481  return AVERROR_PATCHWELCOME;
482  }
483 
484  channels = (element == TYPE_CPE) ? 2 : 1;
485  if (ch + channels > alac->channels ||
486  ff_alac_channel_layout_offsets[alac->channels - 1][ch] + channels > alac->channels) {
487  av_log(avctx, AV_LOG_ERROR, "invalid element channel count\n");
488  return AVERROR_INVALIDDATA;
489  }
490 
491  ret = decode_element(avctx, frame,
493  channels);
494  if (ret < 0 && get_bits_left(&alac->gb))
495  return ret;
496 
497  ch += channels;
498  }
499  if (!got_end) {
500  av_log(avctx, AV_LOG_ERROR, "no end tag found. incomplete packet.\n");
501  return AVERROR_INVALIDDATA;
502  }
503 
504  if (avpkt->size * 8 - get_bits_count(&alac->gb) > 8) {
505  av_log(avctx, AV_LOG_ERROR, "Error : %d bits left\n",
506  avpkt->size * 8 - get_bits_count(&alac->gb));
507  }
508 
509  if (alac->channels == ch)
510  *got_frame_ptr = 1;
511  else
512  av_log(avctx, AV_LOG_WARNING, "Failed to decode all channels\n");
513 
514  return avpkt->size;
515 }
516 
518 {
519  ALACContext *alac = avctx->priv_data;
520 
521  int ch;
522  for (ch = 0; ch < FFMIN(alac->channels, 2); ch++) {
523  av_freep(&alac->predict_error_buffer[ch]);
524  if (!alac->direct_output)
525  av_freep(&alac->output_samples_buffer[ch]);
526  av_freep(&alac->extra_bits_buffer[ch]);
527  }
528 
529  return 0;
530 }
531 
532 static int allocate_buffers(ALACContext *alac)
533 {
534  int ch;
535  int buf_size = alac->max_samples_per_frame * sizeof(int32_t);
536 
537  for (ch = 0; ch < 2; ch++) {
538  alac->predict_error_buffer[ch] = NULL;
539  alac->output_samples_buffer[ch] = NULL;
540  alac->extra_bits_buffer[ch] = NULL;
541  }
542 
543  for (ch = 0; ch < FFMIN(alac->channels, 2); ch++) {
545  buf_size, buf_alloc_fail);
546 
547  alac->direct_output = alac->sample_size > 16 && av_sample_fmt_is_planar(alac->avctx->sample_fmt);
548  if (!alac->direct_output) {
550  buf_size, buf_alloc_fail);
551  }
552 
553  FF_ALLOC_OR_GOTO(alac->avctx, alac->extra_bits_buffer[ch],
554  buf_size, buf_alloc_fail);
555  }
556  return 0;
557 buf_alloc_fail:
558  alac_decode_close(alac->avctx);
559  return AVERROR(ENOMEM);
560 }
561 
562 static int alac_set_info(ALACContext *alac)
563 {
564  GetByteContext gb;
565 
566  bytestream2_init(&gb, alac->avctx->extradata,
567  alac->avctx->extradata_size);
568 
569  bytestream2_skipu(&gb, 12); // size:4, alac:4, version:4
570 
571  alac->max_samples_per_frame = bytestream2_get_be32u(&gb);
572  if (!alac->max_samples_per_frame ||
573  alac->max_samples_per_frame > INT_MAX / sizeof(int32_t)) {
574  av_log(alac->avctx, AV_LOG_ERROR,
575  "max samples per frame invalid: %"PRIu32"\n",
576  alac->max_samples_per_frame);
577  return AVERROR_INVALIDDATA;
578  }
579  bytestream2_skipu(&gb, 1); // compatible version
580  alac->sample_size = bytestream2_get_byteu(&gb);
581  alac->rice_history_mult = bytestream2_get_byteu(&gb);
582  alac->rice_initial_history = bytestream2_get_byteu(&gb);
583  alac->rice_limit = bytestream2_get_byteu(&gb);
584  alac->channels = bytestream2_get_byteu(&gb);
585  bytestream2_get_be16u(&gb); // maxRun
586  bytestream2_get_be32u(&gb); // max coded frame size
587  bytestream2_get_be32u(&gb); // average bitrate
588  bytestream2_get_be32u(&gb); // samplerate
589 
590  return 0;
591 }
592 
594 {
595  int ret;
596  int req_packed;
597  ALACContext *alac = avctx->priv_data;
598  alac->avctx = avctx;
599 
600  /* initialize from the extradata */
602  av_log(avctx, AV_LOG_ERROR, "extradata is too small\n");
603  return AVERROR_INVALIDDATA;
604  }
605  if (alac_set_info(alac)) {
606  av_log(avctx, AV_LOG_ERROR, "set_info failed\n");
607  return -1;
608  }
609 
611  switch (alac->sample_size) {
612  case 16: avctx->sample_fmt = req_packed ? AV_SAMPLE_FMT_S16 : AV_SAMPLE_FMT_S16P;
613  break;
614  case 24:
615  case 32: avctx->sample_fmt = req_packed ? AV_SAMPLE_FMT_S32 : AV_SAMPLE_FMT_S32P;
616  break;
617  default: avpriv_request_sample(avctx, "Sample depth %d", alac->sample_size);
618  return AVERROR_PATCHWELCOME;
619  }
620  avctx->bits_per_raw_sample = alac->sample_size;
621 
622  if (alac->channels < 1) {
623  av_log(avctx, AV_LOG_WARNING, "Invalid channel count\n");
624  alac->channels = avctx->channels;
625  } else {
626  if (alac->channels > ALAC_MAX_CHANNELS)
627  alac->channels = avctx->channels;
628  else
629  avctx->channels = alac->channels;
630  }
631  if (avctx->channels > ALAC_MAX_CHANNELS || avctx->channels <= 0 ) {
632  av_log(avctx, AV_LOG_ERROR, "Unsupported channel count: %d\n",
633  avctx->channels);
634  return AVERROR_PATCHWELCOME;
635  }
636  avctx->channel_layout = ff_alac_channel_layouts[alac->channels - 1];
637 
638  if ((ret = allocate_buffers(alac)) < 0) {
639  av_log(avctx, AV_LOG_ERROR, "Error allocating buffers\n");
640  return ret;
641  }
642 
643  return 0;
644 }
645 
647 {
648  ALACContext *alac = avctx->priv_data;
649  alac->avctx = avctx;
650  return allocate_buffers(alac);
651 }
652 
653 static const AVOption options[] = {
654  { "extra_bits_bug", "Force non-standard decoding process",
655  offsetof(ALACContext, extra_bit_bug), AV_OPT_TYPE_INT, { .i64 = 0 },
657  { NULL },
658 };
659 
660 static const AVClass alac_class = {
661  .class_name = "alac",
662  .item_name = av_default_item_name,
663  .option = options,
664  .version = LIBAVUTIL_VERSION_INT,
665 };
666 
668  .name = "alac",
669  .long_name = NULL_IF_CONFIG_SMALL("ALAC (Apple Lossless Audio Codec)"),
670  .type = AVMEDIA_TYPE_AUDIO,
671  .id = AV_CODEC_ID_ALAC,
672  .priv_data_size = sizeof(ALACContext),
674  .close = alac_decode_close,
678  .priv_class = &alac_class
679 };
#define extra_bits(eb)
Definition: intrax8.c:152
int extra_bit_bug
Definition: alac.c:83
#define NULL
Definition: coverity.c:32
const char const char void * val
Definition: avisynth_c.h:634
float v
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int nb_samples
number of samples in the current frame
Definition: alac.c:80
This structure describes decoded (raw) audio or video data.
Definition: frame.h:171
#define ALAC_EXTRADATA_SIZE
Definition: alac.c:61
AVOption.
Definition: opt.h:255
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:260
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
AVFrame * f
Definition: thread.h:36
static int decode_element(AVCodecContext *avctx, AVFrame *frame, int ch_index, int channels)
Definition: alac.c:262
#define LIBAVUTIL_VERSION_INT
Definition: version.h:62
Definition: aac.h:63
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
Definition: aac.h:57
#define AV_OPT_FLAG_AUDIO_PARAM
Definition: opt.h:290
int size
Definition: avcodec.h:1424
const char * b
Definition: vf_curves.c:109
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
static const AVOption options[]
Definition: alac.c:653
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:3003
int32_t * extra_bits_buffer[2]
Definition: alac.c:71
AVCodec.
Definition: avcodec.h:3472
static int get_sbits(GetBitContext *s, int n)
Definition: get_bits.h:245
static int get_sbits_long(GetBitContext *s, int n)
Read 0-32 bits as a signed integer.
Definition: get_bits.h:375
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
int32_t * predict_error_buffer[2]
Definition: alac.c:69
static int get_unary_0_9(GetBitContext *gb)
Definition: unary.h:51
#define LIBAVCODEC_VERSION_MAJOR
Definition: version.h:31
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:2270
uint8_t
#define av_cold
Definition: attributes.h:74
AVOptions.
uint8_t rice_initial_history
Definition: alac.c:76
Definition: aac.h:59
static av_cold int alac_decode_close(AVCodecContext *avctx)
Definition: alac.c:517
Multithreading support functions.
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1617
static AVFrame * frame
uint8_t * data
Definition: avcodec.h:1423
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:212
static av_always_inline void bytestream2_skipu(GetByteContext *g, unsigned int size)
Definition: bytestream.h:170
static const AVClass alac_class
Definition: alac.c:660
bitstream reader API header.
int32_t * output_samples_buffer[2]
Definition: alac.c:70
static int alac_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
Definition: alac.c:458
signed 32 bits
Definition: samplefmt.h:63
int extra_bits
number of extra bits beyond 16-bit
Definition: alac.c:79
#define av_log(a,...)
int av_sample_fmt_is_planar(enum AVSampleFormat sample_fmt)
Check if the sample format is planar.
Definition: samplefmt.c:110
#define U(x)
Definition: vp56_arith.h:37
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:588
static void append_extra_bits(int32_t *buffer[2], int32_t *extra_bits_buffer[2], int extra_bits, int channels, int nb_samples)
Definition: alac.c:252
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
static void lpc_prediction(int32_t *error_buffer, int32_t *buffer_out, int nb_samples, int bps, int16_t *lpc_coefs, int lpc_order, int lpc_quant)
Definition: alac.c:170
av_default_item_name
#define AVERROR(e)
Definition: error.h:43
enum AVSampleFormat request_sample_fmt
desired sample format
Definition: avcodec.h:2345
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:175
static int sign_only(int v)
Definition: alac.c:165
AlacRawDataBlockType
Definition: alac_data.h:26
const char * name
Name of the codec implementation.
Definition: avcodec.h:3479
Libavcodec external API header.
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: avcodec.h:920
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:2323
#define ALAC_MAX_CHANNELS
Definition: alac_data.h:38
uint32_t max_samples_per_frame
Definition: alac.c:73
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:214
static void decorrelate_stereo(int32_t *buffer[2], int nb_samples, int decorr_shift, int decorr_left_weight)
Definition: alac.c:233
audio channel layout utility functions
#define FFMIN(a, b)
Definition: common.h:81
signed 32 bits, planar
Definition: samplefmt.h:69
#define FFSIGN(a)
Definition: common.h:69
GetBitContext gb
Definition: alac.c:66
int32_t
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:287
static int alac_set_info(ALACContext *alac)
Definition: alac.c:562
uint8_t rice_history_mult
Definition: alac.c:75
const uint64_t ff_alac_channel_layouts[ALAC_MAX_CHANNELS+1]
Definition: alac_data.c:35
#define av_log2
Definition: intmath.h:100
static const float pred[4]
Definition: siprdata.h:259
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:441
int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
Wrapper around get_buffer() for frame-multithreaded codecs.
main external API structure.
Definition: avcodec.h:1502
int extradata_size
Definition: avcodec.h:1618
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:304
Describe the class of an AVClass context structure.
Definition: log.h:67
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:297
static unsigned int decode_scalar(GetBitContext *gb, int k, int bps)
Definition: alac.c:86
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
Definition: opt.h:286
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:337
const uint8_t ff_alac_channel_layout_offsets[ALAC_MAX_CHANNELS][ALAC_MAX_CHANNELS]
Definition: alac_data.c:24
static av_const int sign_extend(int val, unsigned bits)
Definition: mathops.h:138
uint8_t sample_size
Definition: alac.c:74
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:523
int channels
Definition: alac.c:67
AVCodec ff_alac_decoder
Definition: alac.c:667
common internal api header.
static av_cold int alac_decode_init(AVCodecContext *avctx)
Definition: alac.c:593
#define FF_ALLOC_OR_GOTO(ctx, p, size, label)
Definition: internal.h:129
signed 16 bits
Definition: samplefmt.h:62
uint8_t rice_limit
Definition: alac.c:77
unsigned bps
Definition: movenc.c:1335
void * priv_data
Definition: avcodec.h:1544
static int allocate_buffers(ALACContext *alac)
Definition: alac.c:532
int channels
number of audio channels
Definition: avcodec.h:2263
AVCodecContext * avctx
Definition: alac.c:65
static int rice_decompress(ALACContext *alac, int32_t *output_buffer, int nb_samples, int bps, int rice_history_mult)
Definition: alac.c:108
#define av_freep(p)
static int init_thread_copy(AVCodecContext *avctx)
Definition: alac.c:646
signed 16 bits, planar
Definition: samplefmt.h:68
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: frame.h:215
int direct_output
Definition: alac.c:82
This structure stores compressed data.
Definition: avcodec.h:1400
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:225
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:857
for(j=16;j >0;--j)
GLuint buffer
Definition: opengl_enc.c:102