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alacenc.c
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1 /*
2  * ALAC audio encoder
3  * Copyright (c) 2008 Jaikrishnan Menon <realityman@gmx.net>
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 #include "avcodec.h"
23 #include "put_bits.h"
24 #include "internal.h"
25 #include "lpc.h"
26 #include "mathops.h"
27 #include "alac_data.h"
28 
29 #define DEFAULT_FRAME_SIZE 4096
30 #define ALAC_EXTRADATA_SIZE 36
31 #define ALAC_FRAME_HEADER_SIZE 55
32 #define ALAC_FRAME_FOOTER_SIZE 3
33 
34 #define ALAC_ESCAPE_CODE 0x1FF
35 #define ALAC_MAX_LPC_ORDER 30
36 #define DEFAULT_MAX_PRED_ORDER 6
37 #define DEFAULT_MIN_PRED_ORDER 4
38 #define ALAC_MAX_LPC_PRECISION 9
39 #define ALAC_MAX_LPC_SHIFT 9
40 
41 #define ALAC_CHMODE_LEFT_RIGHT 0
42 #define ALAC_CHMODE_LEFT_SIDE 1
43 #define ALAC_CHMODE_RIGHT_SIDE 2
44 #define ALAC_CHMODE_MID_SIDE 3
45 
46 typedef struct RiceContext {
51 } RiceContext;
52 
53 typedef struct AlacLPCContext {
54  int lpc_order;
56  int lpc_quant;
58 
59 typedef struct AlacEncodeContext {
60  int frame_size; /**< current frame size */
61  int verbatim; /**< current frame verbatim mode flag */
78 
79 
80 static void init_sample_buffers(AlacEncodeContext *s, int channels,
81  uint8_t const *samples[2])
82 {
83  int ch, i;
86 
87 #define COPY_SAMPLES(type) do { \
88  for (ch = 0; ch < channels; ch++) { \
89  int32_t *bptr = s->sample_buf[ch]; \
90  const type *sptr = (const type *)samples[ch]; \
91  for (i = 0; i < s->frame_size; i++) \
92  bptr[i] = sptr[i] >> shift; \
93  } \
94  } while (0)
95 
98  else
99  COPY_SAMPLES(int16_t);
100 }
101 
102 static void encode_scalar(AlacEncodeContext *s, int x,
103  int k, int write_sample_size)
104 {
105  int divisor, q, r;
106 
107  k = FFMIN(k, s->rc.k_modifier);
108  divisor = (1<<k) - 1;
109  q = x / divisor;
110  r = x % divisor;
111 
112  if (q > 8) {
113  // write escape code and sample value directly
115  put_bits(&s->pbctx, write_sample_size, x);
116  } else {
117  if (q)
118  put_bits(&s->pbctx, q, (1<<q) - 1);
119  put_bits(&s->pbctx, 1, 0);
120 
121  if (k != 1) {
122  if (r > 0)
123  put_bits(&s->pbctx, k, r+1);
124  else
125  put_bits(&s->pbctx, k-1, 0);
126  }
127  }
128 }
129 
131  enum AlacRawDataBlockType element,
132  int instance)
133 {
134  int encode_fs = 0;
135 
137  encode_fs = 1;
138 
139  put_bits(&s->pbctx, 3, element); // element type
140  put_bits(&s->pbctx, 4, instance); // element instance
141  put_bits(&s->pbctx, 12, 0); // unused header bits
142  put_bits(&s->pbctx, 1, encode_fs); // Sample count is in the header
143  put_bits(&s->pbctx, 2, s->extra_bits >> 3); // Extra bytes (for 24-bit)
144  put_bits(&s->pbctx, 1, s->verbatim); // Audio block is verbatim
145  if (encode_fs)
146  put_bits32(&s->pbctx, s->frame_size); // No. of samples in the frame
147 }
148 
150 {
152  int shift[MAX_LPC_ORDER];
153  int opt_order;
154 
155  if (s->compression_level == 1) {
156  s->lpc[ch].lpc_order = 6;
157  s->lpc[ch].lpc_quant = 6;
158  s->lpc[ch].lpc_coeff[0] = 160;
159  s->lpc[ch].lpc_coeff[1] = -190;
160  s->lpc[ch].lpc_coeff[2] = 170;
161  s->lpc[ch].lpc_coeff[3] = -130;
162  s->lpc[ch].lpc_coeff[4] = 80;
163  s->lpc[ch].lpc_coeff[5] = -25;
164  } else {
165  opt_order = ff_lpc_calc_coefs(&s->lpc_ctx, s->sample_buf[ch],
166  s->frame_size,
169  ALAC_MAX_LPC_PRECISION, coefs, shift,
172 
173  s->lpc[ch].lpc_order = opt_order;
174  s->lpc[ch].lpc_quant = shift[opt_order-1];
175  memcpy(s->lpc[ch].lpc_coeff, coefs[opt_order-1], opt_order*sizeof(int));
176  }
177 }
178 
179 static int estimate_stereo_mode(int32_t *left_ch, int32_t *right_ch, int n)
180 {
181  int i, best;
182  int32_t lt, rt;
183  uint64_t sum[4];
184  uint64_t score[4];
185 
186  /* calculate sum of 2nd order residual for each channel */
187  sum[0] = sum[1] = sum[2] = sum[3] = 0;
188  for (i = 2; i < n; i++) {
189  lt = left_ch[i] - 2 * left_ch[i - 1] + left_ch[i - 2];
190  rt = right_ch[i] - 2 * right_ch[i - 1] + right_ch[i - 2];
191  sum[2] += FFABS((lt + rt) >> 1);
192  sum[3] += FFABS(lt - rt);
193  sum[0] += FFABS(lt);
194  sum[1] += FFABS(rt);
195  }
196 
197  /* calculate score for each mode */
198  score[0] = sum[0] + sum[1];
199  score[1] = sum[0] + sum[3];
200  score[2] = sum[1] + sum[3];
201  score[3] = sum[2] + sum[3];
202 
203  /* return mode with lowest score */
204  best = 0;
205  for (i = 1; i < 4; i++) {
206  if (score[i] < score[best])
207  best = i;
208  }
209  return best;
210 }
211 
213 {
214  int32_t *left = s->sample_buf[0], *right = s->sample_buf[1];
215  int i, mode, n = s->frame_size;
216  int32_t tmp;
217 
218  mode = estimate_stereo_mode(left, right, n);
219 
220  switch (mode) {
222  s->interlacing_leftweight = 0;
223  s->interlacing_shift = 0;
224  break;
226  for (i = 0; i < n; i++)
227  right[i] = left[i] - right[i];
228  s->interlacing_leftweight = 1;
229  s->interlacing_shift = 0;
230  break;
232  for (i = 0; i < n; i++) {
233  tmp = right[i];
234  right[i] = left[i] - right[i];
235  left[i] = tmp + (right[i] >> 31);
236  }
237  s->interlacing_leftweight = 1;
238  s->interlacing_shift = 31;
239  break;
240  default:
241  for (i = 0; i < n; i++) {
242  tmp = left[i];
243  left[i] = (tmp + right[i]) >> 1;
244  right[i] = tmp - right[i];
245  }
246  s->interlacing_leftweight = 1;
247  s->interlacing_shift = 1;
248  break;
249  }
250 }
251 
253 {
254  int i;
255  AlacLPCContext lpc = s->lpc[ch];
256  int32_t *residual = s->predictor_buf[ch];
257 
258  if (lpc.lpc_order == 31) {
259  residual[0] = s->sample_buf[ch][0];
260 
261  for (i = 1; i < s->frame_size; i++) {
262  residual[i] = s->sample_buf[ch][i ] -
263  s->sample_buf[ch][i - 1];
264  }
265 
266  return;
267  }
268 
269  // generalised linear predictor
270 
271  if (lpc.lpc_order > 0) {
272  int32_t *samples = s->sample_buf[ch];
273 
274  // generate warm-up samples
275  residual[0] = samples[0];
276  for (i = 1; i <= lpc.lpc_order; i++)
277  residual[i] = sign_extend(samples[i] - samples[i-1], s->write_sample_size);
278 
279  // perform lpc on remaining samples
280  for (i = lpc.lpc_order + 1; i < s->frame_size; i++) {
281  int sum = 1 << (lpc.lpc_quant - 1), res_val, j;
282 
283  for (j = 0; j < lpc.lpc_order; j++) {
284  sum += (samples[lpc.lpc_order-j] - samples[0]) *
285  lpc.lpc_coeff[j];
286  }
287 
288  sum >>= lpc.lpc_quant;
289  sum += samples[0];
290  residual[i] = sign_extend(samples[lpc.lpc_order+1] - sum,
291  s->write_sample_size);
292  res_val = residual[i];
293 
294  if (res_val) {
295  int index = lpc.lpc_order - 1;
296  int neg = (res_val < 0);
297 
298  while (index >= 0 && (neg ? (res_val < 0) : (res_val > 0))) {
299  int val = samples[0] - samples[lpc.lpc_order - index];
300  int sign = (val ? FFSIGN(val) : 0);
301 
302  if (neg)
303  sign *= -1;
304 
305  lpc.lpc_coeff[index] -= sign;
306  val *= sign;
307  res_val -= (val >> lpc.lpc_quant) * (lpc.lpc_order - index);
308  index--;
309  }
310  }
311  samples++;
312  }
313  }
314 }
315 
317 {
318  unsigned int history = s->rc.initial_history;
319  int sign_modifier = 0, i, k;
320  int32_t *samples = s->predictor_buf[ch];
321 
322  for (i = 0; i < s->frame_size;) {
323  int x;
324 
325  k = av_log2((history >> 9) + 3);
326 
327  x = -2 * (*samples) -1;
328  x ^= x >> 31;
329 
330  samples++;
331  i++;
332 
333  encode_scalar(s, x - sign_modifier, k, s->write_sample_size);
334 
335  history += x * s->rc.history_mult -
336  ((history * s->rc.history_mult) >> 9);
337 
338  sign_modifier = 0;
339  if (x > 0xFFFF)
340  history = 0xFFFF;
341 
342  if (history < 128 && i < s->frame_size) {
343  unsigned int block_size = 0;
344 
345  k = 7 - av_log2(history) + ((history + 16) >> 6);
346 
347  while (*samples == 0 && i < s->frame_size) {
348  samples++;
349  i++;
350  block_size++;
351  }
352  encode_scalar(s, block_size, k, 16);
353  sign_modifier = (block_size <= 0xFFFF);
354  history = 0;
355  }
356 
357  }
358 }
359 
361  enum AlacRawDataBlockType element, int instance,
362  const uint8_t *samples0, const uint8_t *samples1)
363 {
364  uint8_t const *samples[2] = { samples0, samples1 };
365  int i, j, channels;
366  int prediction_type = 0;
367  PutBitContext *pb = &s->pbctx;
368 
369  channels = element == TYPE_CPE ? 2 : 1;
370 
371  if (s->verbatim) {
372  write_element_header(s, element, instance);
373  /* samples are channel-interleaved in verbatim mode */
374  if (s->avctx->sample_fmt == AV_SAMPLE_FMT_S32P) {
375  int shift = 32 - s->avctx->bits_per_raw_sample;
376  int32_t const *samples_s32[2] = { (const int32_t *)samples0,
377  (const int32_t *)samples1 };
378  for (i = 0; i < s->frame_size; i++)
379  for (j = 0; j < channels; j++)
381  samples_s32[j][i] >> shift);
382  } else {
383  int16_t const *samples_s16[2] = { (const int16_t *)samples0,
384  (const int16_t *)samples1 };
385  for (i = 0; i < s->frame_size; i++)
386  for (j = 0; j < channels; j++)
388  samples_s16[j][i]);
389  }
390  } else {
392  channels - 1;
393 
394  init_sample_buffers(s, channels, samples);
395  write_element_header(s, element, instance);
396 
397  // extract extra bits if needed
398  if (s->extra_bits) {
399  uint32_t mask = (1 << s->extra_bits) - 1;
400  for (j = 0; j < channels; j++) {
401  int32_t *extra = s->predictor_buf[j];
402  int32_t *smp = s->sample_buf[j];
403  for (i = 0; i < s->frame_size; i++) {
404  extra[i] = smp[i] & mask;
405  smp[i] >>= s->extra_bits;
406  }
407  }
408  }
409 
410  if (channels == 2)
412  else
414  put_bits(pb, 8, s->interlacing_shift);
415  put_bits(pb, 8, s->interlacing_leftweight);
416 
417  for (i = 0; i < channels; i++) {
418  calc_predictor_params(s, i);
419 
420  put_bits(pb, 4, prediction_type);
421  put_bits(pb, 4, s->lpc[i].lpc_quant);
422 
423  put_bits(pb, 3, s->rc.rice_modifier);
424  put_bits(pb, 5, s->lpc[i].lpc_order);
425  // predictor coeff. table
426  for (j = 0; j < s->lpc[i].lpc_order; j++)
427  put_sbits(pb, 16, s->lpc[i].lpc_coeff[j]);
428  }
429 
430  // write extra bits if needed
431  if (s->extra_bits) {
432  for (i = 0; i < s->frame_size; i++) {
433  for (j = 0; j < channels; j++) {
434  put_bits(pb, s->extra_bits, s->predictor_buf[j][i]);
435  }
436  }
437  }
438 
439  // apply lpc and entropy coding to audio samples
440  for (i = 0; i < channels; i++) {
441  alac_linear_predictor(s, i);
442 
443  // TODO: determine when this will actually help. for now it's not used.
444  if (prediction_type == 15) {
445  // 2nd pass 1st order filter
446  int32_t *residual = s->predictor_buf[i];
447  for (j = s->frame_size - 1; j > 0; j--)
448  residual[j] -= residual[j - 1];
449  }
450  alac_entropy_coder(s, i);
451  }
452  }
453 }
454 
456  uint8_t * const *samples)
457 {
458  PutBitContext *pb = &s->pbctx;
459  const enum AlacRawDataBlockType *ch_elements = ff_alac_channel_elements[s->avctx->channels - 1];
460  const uint8_t *ch_map = ff_alac_channel_layout_offsets[s->avctx->channels - 1];
461  int ch, element, sce, cpe;
462 
463  init_put_bits(pb, avpkt->data, avpkt->size);
464 
465  ch = element = sce = cpe = 0;
466  while (ch < s->avctx->channels) {
467  if (ch_elements[element] == TYPE_CPE) {
468  write_element(s, TYPE_CPE, cpe, samples[ch_map[ch]],
469  samples[ch_map[ch + 1]]);
470  cpe++;
471  ch += 2;
472  } else {
473  write_element(s, TYPE_SCE, sce, samples[ch_map[ch]], NULL);
474  sce++;
475  ch++;
476  }
477  element++;
478  }
479 
480  put_bits(pb, 3, TYPE_END);
481  flush_put_bits(pb);
482 
483  return put_bits_count(pb) >> 3;
484 }
485 
486 static av_always_inline int get_max_frame_size(int frame_size, int ch, int bps)
487 {
488  int header_bits = 23 + 32 * (frame_size < DEFAULT_FRAME_SIZE);
489  return FFALIGN(header_bits + bps * ch * frame_size + 3, 8) / 8;
490 }
491 
493 {
494  AlacEncodeContext *s = avctx->priv_data;
495  ff_lpc_end(&s->lpc_ctx);
496  av_freep(&avctx->extradata);
497  avctx->extradata_size = 0;
498  return 0;
499 }
500 
502 {
503  AlacEncodeContext *s = avctx->priv_data;
504  int ret;
505  uint8_t *alac_extradata;
506 
508 
509  if (avctx->sample_fmt == AV_SAMPLE_FMT_S32P) {
510  if (avctx->bits_per_raw_sample != 24)
511  av_log(avctx, AV_LOG_WARNING, "encoding as 24 bits-per-sample\n");
512  avctx->bits_per_raw_sample = 24;
513  } else {
514  avctx->bits_per_raw_sample = 16;
515  s->extra_bits = 0;
516  }
517 
518  // Set default compression level
520  s->compression_level = 2;
521  else
522  s->compression_level = av_clip(avctx->compression_level, 0, 2);
523 
524  // Initialize default Rice parameters
525  s->rc.history_mult = 40;
526  s->rc.initial_history = 10;
527  s->rc.k_modifier = 14;
528  s->rc.rice_modifier = 4;
529 
531  avctx->channels,
532  avctx->bits_per_raw_sample);
533 
535  if (!avctx->extradata) {
536  ret = AVERROR(ENOMEM);
537  goto error;
538  }
540 
541  alac_extradata = avctx->extradata;
542  AV_WB32(alac_extradata, ALAC_EXTRADATA_SIZE);
543  AV_WB32(alac_extradata+4, MKBETAG('a','l','a','c'));
544  AV_WB32(alac_extradata+12, avctx->frame_size);
545  AV_WB8 (alac_extradata+17, avctx->bits_per_raw_sample);
546  AV_WB8 (alac_extradata+21, avctx->channels);
547  AV_WB32(alac_extradata+24, s->max_coded_frame_size);
548  AV_WB32(alac_extradata+28,
549  avctx->sample_rate * avctx->channels * avctx->bits_per_raw_sample); // average bitrate
550  AV_WB32(alac_extradata+32, avctx->sample_rate);
551 
552  // Set relevant extradata fields
553  if (s->compression_level > 0) {
554  AV_WB8(alac_extradata+18, s->rc.history_mult);
555  AV_WB8(alac_extradata+19, s->rc.initial_history);
556  AV_WB8(alac_extradata+20, s->rc.k_modifier);
557  }
558 
560  if (avctx->min_prediction_order >= 0) {
561  if (avctx->min_prediction_order < MIN_LPC_ORDER ||
563  av_log(avctx, AV_LOG_ERROR, "invalid min prediction order: %d\n",
564  avctx->min_prediction_order);
565  ret = AVERROR(EINVAL);
566  goto error;
567  }
568 
570  }
571 
573  if (avctx->max_prediction_order >= 0) {
574  if (avctx->max_prediction_order < MIN_LPC_ORDER ||
576  av_log(avctx, AV_LOG_ERROR, "invalid max prediction order: %d\n",
577  avctx->max_prediction_order);
578  ret = AVERROR(EINVAL);
579  goto error;
580  }
581 
583  }
584 
586  av_log(avctx, AV_LOG_ERROR,
587  "invalid prediction orders: min=%d max=%d\n",
589  ret = AVERROR(EINVAL);
590  goto error;
591  }
592 
593  s->avctx = avctx;
594 
595  if ((ret = ff_lpc_init(&s->lpc_ctx, avctx->frame_size,
597  FF_LPC_TYPE_LEVINSON)) < 0) {
598  goto error;
599  }
600 
601  return 0;
602 error:
603  alac_encode_close(avctx);
604  return ret;
605 }
606 
607 static int alac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
608  const AVFrame *frame, int *got_packet_ptr)
609 {
610  AlacEncodeContext *s = avctx->priv_data;
611  int out_bytes, max_frame_size, ret;
612 
613  s->frame_size = frame->nb_samples;
614 
615  if (frame->nb_samples < DEFAULT_FRAME_SIZE)
616  max_frame_size = get_max_frame_size(s->frame_size, avctx->channels,
617  avctx->bits_per_raw_sample);
618  else
619  max_frame_size = s->max_coded_frame_size;
620 
621  if ((ret = ff_alloc_packet2(avctx, avpkt, 2 * max_frame_size, 0)) < 0)
622  return ret;
623 
624  /* use verbatim mode for compression_level 0 */
625  if (s->compression_level) {
626  s->verbatim = 0;
627  s->extra_bits = avctx->bits_per_raw_sample - 16;
628  } else {
629  s->verbatim = 1;
630  s->extra_bits = 0;
631  }
632 
633  out_bytes = write_frame(s, avpkt, frame->extended_data);
634 
635  if (out_bytes > max_frame_size) {
636  /* frame too large. use verbatim mode */
637  s->verbatim = 1;
638  s->extra_bits = 0;
639  out_bytes = write_frame(s, avpkt, frame->extended_data);
640  }
641 
642  avpkt->size = out_bytes;
643  *got_packet_ptr = 1;
644  return 0;
645 }
646 
648  .name = "alac",
649  .long_name = NULL_IF_CONFIG_SMALL("ALAC (Apple Lossless Audio Codec)"),
650  .type = AVMEDIA_TYPE_AUDIO,
651  .id = AV_CODEC_ID_ALAC,
652  .priv_data_size = sizeof(AlacEncodeContext),
654  .encode2 = alac_encode_frame,
655  .close = alac_encode_close,
656  .capabilities = AV_CODEC_CAP_SMALL_LAST_FRAME,
657  .channel_layouts = ff_alac_channel_layouts,
658  .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S32P,
661 };
#define DEFAULT_MIN_PRED_ORDER
Definition: alacenc.c:37
static void av_unused put_bits32(PutBitContext *s, uint32_t value)
Write exactly 32 bits into a bitstream.
Definition: put_bits.h:202
#define NULL
Definition: coverity.c:32
const char const char void * val
Definition: avisynth_c.h:634
const char * s
Definition: avisynth_c.h:631
#define FF_COMPRESSION_DEFAULT
Definition: avcodec.h:1590
static int shift(int a, int b)
Definition: sonic.c:82
This structure describes decoded (raw) audio or video data.
Definition: frame.h:171
Definition: lpc.h:52
static void put_sbits(PutBitContext *pb, int n, int32_t value)
Definition: put_bits.h:192
static void put_bits(Jpeg2000EncoderContext *s, int val, int n)
put n times val bit
Definition: j2kenc.c:167
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
LPCContext lpc_ctx
Definition: alacenc.c:75
#define ALAC_ESCAPE_CODE
Definition: alacenc.c:34
#define MAX_LPC_ORDER
Definition: lpc.h:38
Definition: aac.h:63
int ff_lpc_calc_coefs(LPCContext *s, const int32_t *samples, int blocksize, int min_order, int max_order, int precision, int32_t coefs[][MAX_LPC_ORDER], int *shift, enum FFLPCType lpc_type, int lpc_passes, int omethod, int max_shift, int zero_shift)
Calculate LPC coefficients for multiple orders.
Definition: lpc.c:196
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
Definition: aac.h:56
Definition: aac.h:57
int size
Definition: avcodec.h:1424
#define AV_WB8(p, d)
Definition: intreadwrite.h:396
#define COPY_SAMPLES(type)
PutBitContext pbctx
Definition: alacenc.c:72
static void write_element_header(AlacEncodeContext *s, enum AlacRawDataBlockType element, int instance)
Definition: alacenc.c:130
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:3003
int history_mult
Definition: alacenc.c:47
static av_cold int alac_encode_init(AVCodecContext *avctx)
Definition: alacenc.c:501
#define DEFAULT_MAX_PRED_ORDER
Definition: alacenc.c:36
AVCodec.
Definition: avcodec.h:3472
#define FFALIGN(x, a)
Definition: common.h:86
int initial_history
Definition: alacenc.c:48
static void write_element(AlacEncodeContext *s, enum AlacRawDataBlockType element, int instance, const uint8_t *samples0, const uint8_t *samples1)
Definition: alacenc.c:360
int lpc_quant
Definition: alacenc.c:56
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:2270
uint8_t
#define av_cold
Definition: attributes.h:74
static void alac_linear_predictor(AlacEncodeContext *s, int ch)
Definition: alacenc.c:252
mode
Definition: f_perms.c:27
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1617
int max_coded_frame_size
Definition: alacenc.c:65
static AVFrame * frame
int interlacing_leftweight
Definition: alacenc.c:71
int interlacing_shift
Definition: alacenc.c:70
AVCodecContext * avctx
Definition: alacenc.c:76
uint8_t * data
Definition: avcodec.h:1423
AVCodec ff_alac_encoder
Definition: alacenc.c:647
int min_prediction_order
Definition: avcodec.h:2719
#define av_log(a,...)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
static void calc_predictor_params(AlacEncodeContext *s, int ch)
Definition: alacenc.c:149
static const uint16_t mask[17]
Definition: lzw.c:38
static int alac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Definition: alacenc.c:607
#define AVERROR(e)
Definition: error.h:43
#define ALAC_MAX_LPC_PRECISION
Definition: alacenc.c:38
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:175
const char * r
Definition: vf_curves.c:107
AlacRawDataBlockType
Definition: alac_data.h:26
const char * name
Name of the codec implementation.
Definition: avcodec.h:3479
Libavcodec external API header.
static void alac_entropy_coder(AlacEncodeContext *s, int ch)
Definition: alacenc.c:316
int frame_size
current frame size
Definition: alacenc.c:60
static int put_bits_count(PutBitContext *s)
Definition: put_bits.h:85
av_cold void ff_lpc_end(LPCContext *s)
Uninitialize LPCContext.
Definition: lpc.c:316
#define AV_CODEC_CAP_SMALL_LAST_FRAME
Codec can be fed a final frame with a smaller size.
Definition: avcodec.h:887
#define FFMIN(a, b)
Definition: common.h:81
signed 32 bits, planar
Definition: samplefmt.h:69
int verbatim
current frame verbatim mode flag
Definition: alacenc.c:61
#define FFSIGN(a)
Definition: common.h:69
int32_t
int k_modifier
Definition: alacenc.c:49
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:68
static av_always_inline int get_max_frame_size(int frame_size, int ch, int bps)
Definition: alacenc.c:486
int n
Definition: avisynth_c.h:547
const uint64_t ff_alac_channel_layouts[ALAC_MAX_CHANNELS+1]
Definition: alac_data.c:35
int max_prediction_order
Definition: alacenc.c:64
#define ALAC_CHMODE_LEFT_SIDE
Definition: alacenc.c:42
#define av_log2
Definition: intmath.h:100
#define ALAC_MAX_LPC_ORDER
Definition: alacenc.c:35
AlacLPCContext lpc[2]
Definition: alacenc.c:74
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:2282
int frame_size
Definition: mxfenc.c:1805
int32_t sample_buf[2][DEFAULT_FRAME_SIZE]
Definition: alacenc.c:68
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:59
int compression_level
Definition: avcodec.h:1589
int sample_rate
samples per second
Definition: avcodec.h:2262
#define MIN_LPC_ORDER
Definition: lpc.h:37
#define ALAC_MAX_LPC_SHIFT
Definition: alacenc.c:39
main external API structure.
Definition: avcodec.h:1502
int compression_level
Definition: alacenc.c:62
Levinson-Durbin recursion.
Definition: lpc.h:47
#define ORDER_METHOD_EST
Definition: lpc.h:30
int extradata_size
Definition: avcodec.h:1618
int32_t predictor_buf[2][DEFAULT_FRAME_SIZE]
Definition: alacenc.c:69
#define AV_WB32(p, v)
Definition: intreadwrite.h:419
int index
Definition: gxfenc.c:89
static void init_sample_buffers(AlacEncodeContext *s, int channels, uint8_t const *samples[2])
Definition: alacenc.c:80
int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int64_t min_size)
Check AVPacket size and/or allocate data.
Definition: utils.c:1782
const uint8_t ff_alac_channel_layout_offsets[ALAC_MAX_CHANNELS][ALAC_MAX_CHANNELS]
Definition: alac_data.c:24
av_cold int ff_lpc_init(LPCContext *s, int blocksize, int max_order, enum FFLPCType lpc_type)
Initialize LPCContext.
Definition: lpc.c:294
static int write_frame(AlacEncodeContext *s, AVPacket *avpkt, uint8_t *const *samples)
Definition: alacenc.c:455
static av_const int sign_extend(int val, unsigned bits)
Definition: mathops.h:138
enum AlacRawDataBlockType ff_alac_channel_elements[ALAC_MAX_CHANNELS][5]
Definition: alac_data.c:47
int lpc_order
Definition: alacenc.c:54
int av_get_bytes_per_sample(enum AVSampleFormat sample_fmt)
Return number of bytes per sample.
Definition: samplefmt.c:104
static int estimate_stereo_mode(int32_t *left_ch, int32_t *right_ch, int n)
Definition: alacenc.c:179
int rice_modifier
Definition: alacenc.c:50
int min_prediction_order
Definition: alacenc.c:63
common internal api header.
static void flush_put_bits(PutBitContext *s)
Pad the end of the output stream with zeros.
Definition: put_bits.h:101
#define ALAC_CHMODE_LEFT_RIGHT
Definition: alacenc.c:41
#define ALAC_CHMODE_RIGHT_SIDE
Definition: alacenc.c:43
RiceContext rc
Definition: alacenc.c:73
static av_cold int alac_encode_close(AVCodecContext *avctx)
Definition: alacenc.c:492
static void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
Initialize the PutBitContext s.
Definition: put_bits.h:48
unsigned bps
Definition: movenc.c:1335
#define MKBETAG(a, b, c, d)
Definition: common.h:331
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:636
void * priv_data
Definition: avcodec.h:1544
int lpc_coeff[ALAC_MAX_LPC_ORDER+1]
Definition: alacenc.c:55
int channels
number of audio channels
Definition: avcodec.h:2263
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:701
int max_prediction_order
Definition: avcodec.h:2725
#define av_freep(p)
signed 16 bits, planar
Definition: samplefmt.h:68
#define av_always_inline
Definition: attributes.h:37
#define ALAC_EXTRADATA_SIZE
Definition: alacenc.c:30
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: frame.h:215
#define DEFAULT_FRAME_SIZE
Definition: alacenc.c:29
This structure stores compressed data.
Definition: avcodec.h:1400
static void alac_stereo_decorrelation(AlacEncodeContext *s)
Definition: alacenc.c:212
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:225
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:252
static void encode_scalar(AlacEncodeContext *s, int x, int k, int write_sample_size)
Definition: alacenc.c:102
int write_sample_size
Definition: alacenc.c:66
bitstream writer API