Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / flacenc.c
CommitLineData
2ba45a60
DM
1/*
2 * FLAC audio encoder
3 * Copyright (c) 2006 Justin Ruggles <justin.ruggles@gmail.com>
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 "libavutil/avassert.h"
23#include "libavutil/crc.h"
24#include "libavutil/intmath.h"
25#include "libavutil/md5.h"
26#include "libavutil/opt.h"
27#include "avcodec.h"
28#include "bswapdsp.h"
29#include "put_bits.h"
30#include "golomb.h"
31#include "internal.h"
32#include "lpc.h"
33#include "flac.h"
34#include "flacdata.h"
35#include "flacdsp.h"
36
37#define FLAC_SUBFRAME_CONSTANT 0
38#define FLAC_SUBFRAME_VERBATIM 1
39#define FLAC_SUBFRAME_FIXED 8
40#define FLAC_SUBFRAME_LPC 32
41
42#define MAX_FIXED_ORDER 4
43#define MAX_PARTITION_ORDER 8
44#define MAX_PARTITIONS (1 << MAX_PARTITION_ORDER)
45#define MAX_LPC_PRECISION 15
46#define MAX_LPC_SHIFT 15
47
48enum CodingMode {
49 CODING_MODE_RICE = 4,
50 CODING_MODE_RICE2 = 5,
51};
52
53typedef struct CompressionOptions {
54 int compression_level;
55 int block_time_ms;
56 enum FFLPCType lpc_type;
57 int lpc_passes;
58 int lpc_coeff_precision;
59 int min_prediction_order;
60 int max_prediction_order;
61 int prediction_order_method;
62 int min_partition_order;
63 int max_partition_order;
64 int ch_mode;
65} CompressionOptions;
66
67typedef struct RiceContext {
68 enum CodingMode coding_mode;
69 int porder;
70 int params[MAX_PARTITIONS];
71} RiceContext;
72
73typedef struct FlacSubframe {
74 int type;
75 int type_code;
76 int obits;
77 int wasted;
78 int order;
79 int32_t coefs[MAX_LPC_ORDER];
80 int shift;
81 RiceContext rc;
82 int32_t samples[FLAC_MAX_BLOCKSIZE];
83 int32_t residual[FLAC_MAX_BLOCKSIZE+11];
84} FlacSubframe;
85
86typedef struct FlacFrame {
87 FlacSubframe subframes[FLAC_MAX_CHANNELS];
88 int blocksize;
89 int bs_code[2];
90 uint8_t crc8;
91 int ch_mode;
92 int verbatim_only;
93} FlacFrame;
94
95typedef struct FlacEncodeContext {
96 AVClass *class;
97 PutBitContext pb;
98 int channels;
99 int samplerate;
100 int sr_code[2];
101 int bps_code;
102 int max_blocksize;
103 int min_framesize;
104 int max_framesize;
105 int max_encoded_framesize;
106 uint32_t frame_count;
107 uint64_t sample_count;
108 uint8_t md5sum[16];
109 FlacFrame frame;
110 CompressionOptions options;
111 AVCodecContext *avctx;
112 LPCContext lpc_ctx;
113 struct AVMD5 *md5ctx;
114 uint8_t *md5_buffer;
115 unsigned int md5_buffer_size;
116 BswapDSPContext bdsp;
117 FLACDSPContext flac_dsp;
118
119 int flushed;
120 int64_t next_pts;
121} FlacEncodeContext;
122
123
124/**
125 * Write streaminfo metadata block to byte array.
126 */
127static void write_streaminfo(FlacEncodeContext *s, uint8_t *header)
128{
129 PutBitContext pb;
130
131 memset(header, 0, FLAC_STREAMINFO_SIZE);
132 init_put_bits(&pb, header, FLAC_STREAMINFO_SIZE);
133
134 /* streaminfo metadata block */
135 put_bits(&pb, 16, s->max_blocksize);
136 put_bits(&pb, 16, s->max_blocksize);
137 put_bits(&pb, 24, s->min_framesize);
138 put_bits(&pb, 24, s->max_framesize);
139 put_bits(&pb, 20, s->samplerate);
140 put_bits(&pb, 3, s->channels-1);
141 put_bits(&pb, 5, s->avctx->bits_per_raw_sample - 1);
142 /* write 36-bit sample count in 2 put_bits() calls */
143 put_bits(&pb, 24, (s->sample_count & 0xFFFFFF000LL) >> 12);
144 put_bits(&pb, 12, s->sample_count & 0x000000FFFLL);
145 flush_put_bits(&pb);
146 memcpy(&header[18], s->md5sum, 16);
147}
148
149
150/**
151 * Set blocksize based on samplerate.
152 * Choose the closest predefined blocksize >= BLOCK_TIME_MS milliseconds.
153 */
154static int select_blocksize(int samplerate, int block_time_ms)
155{
156 int i;
157 int target;
158 int blocksize;
159
160 av_assert0(samplerate > 0);
161 blocksize = ff_flac_blocksize_table[1];
162 target = (samplerate * block_time_ms) / 1000;
163 for (i = 0; i < 16; i++) {
164 if (target >= ff_flac_blocksize_table[i] &&
165 ff_flac_blocksize_table[i] > blocksize) {
166 blocksize = ff_flac_blocksize_table[i];
167 }
168 }
169 return blocksize;
170}
171
172
173static av_cold void dprint_compression_options(FlacEncodeContext *s)
174{
175 AVCodecContext *avctx = s->avctx;
176 CompressionOptions *opt = &s->options;
177
178 av_log(avctx, AV_LOG_DEBUG, " compression: %d\n", opt->compression_level);
179
180 switch (opt->lpc_type) {
181 case FF_LPC_TYPE_NONE:
182 av_log(avctx, AV_LOG_DEBUG, " lpc type: None\n");
183 break;
184 case FF_LPC_TYPE_FIXED:
185 av_log(avctx, AV_LOG_DEBUG, " lpc type: Fixed pre-defined coefficients\n");
186 break;
187 case FF_LPC_TYPE_LEVINSON:
188 av_log(avctx, AV_LOG_DEBUG, " lpc type: Levinson-Durbin recursion with Welch window\n");
189 break;
190 case FF_LPC_TYPE_CHOLESKY:
191 av_log(avctx, AV_LOG_DEBUG, " lpc type: Cholesky factorization, %d pass%s\n",
192 opt->lpc_passes, opt->lpc_passes == 1 ? "" : "es");
193 break;
194 }
195
196 av_log(avctx, AV_LOG_DEBUG, " prediction order: %d, %d\n",
197 opt->min_prediction_order, opt->max_prediction_order);
198
199 switch (opt->prediction_order_method) {
200 case ORDER_METHOD_EST:
201 av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "estimate");
202 break;
203 case ORDER_METHOD_2LEVEL:
204 av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "2-level");
205 break;
206 case ORDER_METHOD_4LEVEL:
207 av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "4-level");
208 break;
209 case ORDER_METHOD_8LEVEL:
210 av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "8-level");
211 break;
212 case ORDER_METHOD_SEARCH:
213 av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "full search");
214 break;
215 case ORDER_METHOD_LOG:
216 av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "log search");
217 break;
218 }
219
220
221 av_log(avctx, AV_LOG_DEBUG, " partition order: %d, %d\n",
222 opt->min_partition_order, opt->max_partition_order);
223
224 av_log(avctx, AV_LOG_DEBUG, " block size: %d\n", avctx->frame_size);
225
226 av_log(avctx, AV_LOG_DEBUG, " lpc precision: %d\n",
227 opt->lpc_coeff_precision);
228}
229
230
231static av_cold int flac_encode_init(AVCodecContext *avctx)
232{
233 int freq = avctx->sample_rate;
234 int channels = avctx->channels;
235 FlacEncodeContext *s = avctx->priv_data;
236 int i, level, ret;
237 uint8_t *streaminfo;
238
239 s->avctx = avctx;
240
241 switch (avctx->sample_fmt) {
242 case AV_SAMPLE_FMT_S16:
243 avctx->bits_per_raw_sample = 16;
244 s->bps_code = 4;
245 break;
246 case AV_SAMPLE_FMT_S32:
247 if (avctx->bits_per_raw_sample != 24)
248 av_log(avctx, AV_LOG_WARNING, "encoding as 24 bits-per-sample\n");
249 avctx->bits_per_raw_sample = 24;
250 s->bps_code = 6;
251 break;
252 }
253
254 if (channels < 1 || channels > FLAC_MAX_CHANNELS) {
255 av_log(avctx, AV_LOG_ERROR, "%d channels not supported (max %d)\n",
256 channels, FLAC_MAX_CHANNELS);
257 return AVERROR(EINVAL);
258 }
259 s->channels = channels;
260
261 /* find samplerate in table */
262 if (freq < 1)
263 return -1;
264 for (i = 4; i < 12; i++) {
265 if (freq == ff_flac_sample_rate_table[i]) {
266 s->samplerate = ff_flac_sample_rate_table[i];
267 s->sr_code[0] = i;
268 s->sr_code[1] = 0;
269 break;
270 }
271 }
272 /* if not in table, samplerate is non-standard */
273 if (i == 12) {
274 if (freq % 1000 == 0 && freq < 255000) {
275 s->sr_code[0] = 12;
276 s->sr_code[1] = freq / 1000;
277 } else if (freq % 10 == 0 && freq < 655350) {
278 s->sr_code[0] = 14;
279 s->sr_code[1] = freq / 10;
280 } else if (freq < 65535) {
281 s->sr_code[0] = 13;
282 s->sr_code[1] = freq;
283 } else {
284 av_log(avctx, AV_LOG_ERROR, "%d Hz not supported\n", freq);
285 return AVERROR(EINVAL);
286 }
287 s->samplerate = freq;
288 }
289
290 /* set compression option defaults based on avctx->compression_level */
291 if (avctx->compression_level < 0)
292 s->options.compression_level = 5;
293 else
294 s->options.compression_level = avctx->compression_level;
295
296 level = s->options.compression_level;
297 if (level > 12) {
298 av_log(avctx, AV_LOG_ERROR, "invalid compression level: %d\n",
299 s->options.compression_level);
300 return AVERROR(EINVAL);
301 }
302
303 s->options.block_time_ms = ((int[]){ 27, 27, 27,105,105,105,105,105,105,105,105,105,105})[level];
304
305 if (s->options.lpc_type == FF_LPC_TYPE_DEFAULT)
306 s->options.lpc_type = ((int[]){ FF_LPC_TYPE_FIXED, FF_LPC_TYPE_FIXED, FF_LPC_TYPE_FIXED,
307 FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON,
308 FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON,
309 FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON,
310 FF_LPC_TYPE_LEVINSON})[level];
311
312 s->options.min_prediction_order = ((int[]){ 2, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1})[level];
313 s->options.max_prediction_order = ((int[]){ 3, 4, 4, 6, 8, 8, 8, 8, 12, 12, 12, 32, 32})[level];
314
315 if (s->options.prediction_order_method < 0)
316 s->options.prediction_order_method = ((int[]){ ORDER_METHOD_EST, ORDER_METHOD_EST, ORDER_METHOD_EST,
317 ORDER_METHOD_EST, ORDER_METHOD_EST, ORDER_METHOD_EST,
318 ORDER_METHOD_4LEVEL, ORDER_METHOD_LOG, ORDER_METHOD_4LEVEL,
319 ORDER_METHOD_LOG, ORDER_METHOD_SEARCH, ORDER_METHOD_LOG,
320 ORDER_METHOD_SEARCH})[level];
321
322 if (s->options.min_partition_order > s->options.max_partition_order) {
323 av_log(avctx, AV_LOG_ERROR, "invalid partition orders: min=%d max=%d\n",
324 s->options.min_partition_order, s->options.max_partition_order);
325 return AVERROR(EINVAL);
326 }
327 if (s->options.min_partition_order < 0)
328 s->options.min_partition_order = ((int[]){ 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0})[level];
329 if (s->options.max_partition_order < 0)
330 s->options.max_partition_order = ((int[]){ 2, 2, 3, 3, 3, 8, 8, 8, 8, 8, 8, 8, 8})[level];
331
332 if (s->options.lpc_type == FF_LPC_TYPE_NONE) {
333 s->options.min_prediction_order = 0;
334 } else if (avctx->min_prediction_order >= 0) {
335 if (s->options.lpc_type == FF_LPC_TYPE_FIXED) {
336 if (avctx->min_prediction_order > MAX_FIXED_ORDER) {
337 av_log(avctx, AV_LOG_ERROR, "invalid min prediction order: %d\n",
338 avctx->min_prediction_order);
339 return AVERROR(EINVAL);
340 }
341 } else if (avctx->min_prediction_order < MIN_LPC_ORDER ||
342 avctx->min_prediction_order > MAX_LPC_ORDER) {
343 av_log(avctx, AV_LOG_ERROR, "invalid min prediction order: %d\n",
344 avctx->min_prediction_order);
345 return AVERROR(EINVAL);
346 }
347 s->options.min_prediction_order = avctx->min_prediction_order;
348 }
349 if (s->options.lpc_type == FF_LPC_TYPE_NONE) {
350 s->options.max_prediction_order = 0;
351 } else if (avctx->max_prediction_order >= 0) {
352 if (s->options.lpc_type == FF_LPC_TYPE_FIXED) {
353 if (avctx->max_prediction_order > MAX_FIXED_ORDER) {
354 av_log(avctx, AV_LOG_ERROR, "invalid max prediction order: %d\n",
355 avctx->max_prediction_order);
356 return AVERROR(EINVAL);
357 }
358 } else if (avctx->max_prediction_order < MIN_LPC_ORDER ||
359 avctx->max_prediction_order > MAX_LPC_ORDER) {
360 av_log(avctx, AV_LOG_ERROR, "invalid max prediction order: %d\n",
361 avctx->max_prediction_order);
362 return AVERROR(EINVAL);
363 }
364 s->options.max_prediction_order = avctx->max_prediction_order;
365 }
366 if (s->options.max_prediction_order < s->options.min_prediction_order) {
367 av_log(avctx, AV_LOG_ERROR, "invalid prediction orders: min=%d max=%d\n",
368 s->options.min_prediction_order, s->options.max_prediction_order);
369 return AVERROR(EINVAL);
370 }
371
372 if (avctx->frame_size > 0) {
373 if (avctx->frame_size < FLAC_MIN_BLOCKSIZE ||
374 avctx->frame_size > FLAC_MAX_BLOCKSIZE) {
375 av_log(avctx, AV_LOG_ERROR, "invalid block size: %d\n",
376 avctx->frame_size);
377 return AVERROR(EINVAL);
378 }
379 } else {
380 s->avctx->frame_size = select_blocksize(s->samplerate, s->options.block_time_ms);
381 }
382 s->max_blocksize = s->avctx->frame_size;
383
384 /* set maximum encoded frame size in verbatim mode */
385 s->max_framesize = ff_flac_get_max_frame_size(s->avctx->frame_size,
386 s->channels,
387 s->avctx->bits_per_raw_sample);
388
389 /* initialize MD5 context */
390 s->md5ctx = av_md5_alloc();
391 if (!s->md5ctx)
392 return AVERROR(ENOMEM);
393 av_md5_init(s->md5ctx);
394
395 streaminfo = av_malloc(FLAC_STREAMINFO_SIZE);
396 if (!streaminfo)
397 return AVERROR(ENOMEM);
398 write_streaminfo(s, streaminfo);
399 avctx->extradata = streaminfo;
400 avctx->extradata_size = FLAC_STREAMINFO_SIZE;
401
402 s->frame_count = 0;
403 s->min_framesize = s->max_framesize;
404
405 if (channels == 3 &&
406 avctx->channel_layout != (AV_CH_LAYOUT_STEREO|AV_CH_FRONT_CENTER) ||
407 channels == 4 &&
408 avctx->channel_layout != AV_CH_LAYOUT_2_2 &&
409 avctx->channel_layout != AV_CH_LAYOUT_QUAD ||
410 channels == 5 &&
411 avctx->channel_layout != AV_CH_LAYOUT_5POINT0 &&
412 avctx->channel_layout != AV_CH_LAYOUT_5POINT0_BACK ||
413 channels == 6 &&
414 avctx->channel_layout != AV_CH_LAYOUT_5POINT1 &&
415 avctx->channel_layout != AV_CH_LAYOUT_5POINT1_BACK) {
416 if (avctx->channel_layout) {
417 av_log(avctx, AV_LOG_ERROR, "Channel layout not supported by Flac, "
418 "output stream will have incorrect "
419 "channel layout.\n");
420 } else {
421 av_log(avctx, AV_LOG_WARNING, "No channel layout specified. The encoder "
422 "will use Flac channel layout for "
423 "%d channels.\n", channels);
424 }
425 }
426
427 ret = ff_lpc_init(&s->lpc_ctx, avctx->frame_size,
428 s->options.max_prediction_order, FF_LPC_TYPE_LEVINSON);
429
430 ff_bswapdsp_init(&s->bdsp);
f6fa7814 431 ff_flacdsp_init(&s->flac_dsp, avctx->sample_fmt, channels,
2ba45a60
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432 avctx->bits_per_raw_sample);
433
434 dprint_compression_options(s);
435
436 return ret;
437}
438
439
440static void init_frame(FlacEncodeContext *s, int nb_samples)
441{
442 int i, ch;
443 FlacFrame *frame;
444
445 frame = &s->frame;
446
447 for (i = 0; i < 16; i++) {
448 if (nb_samples == ff_flac_blocksize_table[i]) {
449 frame->blocksize = ff_flac_blocksize_table[i];
450 frame->bs_code[0] = i;
451 frame->bs_code[1] = 0;
452 break;
453 }
454 }
455 if (i == 16) {
456 frame->blocksize = nb_samples;
457 if (frame->blocksize <= 256) {
458 frame->bs_code[0] = 6;
459 frame->bs_code[1] = frame->blocksize-1;
460 } else {
461 frame->bs_code[0] = 7;
462 frame->bs_code[1] = frame->blocksize-1;
463 }
464 }
465
466 for (ch = 0; ch < s->channels; ch++) {
467 FlacSubframe *sub = &frame->subframes[ch];
468
469 sub->wasted = 0;
470 sub->obits = s->avctx->bits_per_raw_sample;
471
472 if (sub->obits > 16)
473 sub->rc.coding_mode = CODING_MODE_RICE2;
474 else
475 sub->rc.coding_mode = CODING_MODE_RICE;
476 }
477
478 frame->verbatim_only = 0;
479}
480
481
482/**
483 * Copy channel-interleaved input samples into separate subframes.
484 */
485static void copy_samples(FlacEncodeContext *s, const void *samples)
486{
487 int i, j, ch;
488 FlacFrame *frame;
489 int shift = av_get_bytes_per_sample(s->avctx->sample_fmt) * 8 -
490 s->avctx->bits_per_raw_sample;
491
492#define COPY_SAMPLES(bits) do { \
493 const int ## bits ## _t *samples0 = samples; \
494 frame = &s->frame; \
495 for (i = 0, j = 0; i < frame->blocksize; i++) \
496 for (ch = 0; ch < s->channels; ch++, j++) \
497 frame->subframes[ch].samples[i] = samples0[j] >> shift; \
498} while (0)
499
500 if (s->avctx->sample_fmt == AV_SAMPLE_FMT_S16)
501 COPY_SAMPLES(16);
502 else
503 COPY_SAMPLES(32);
504}
505
506
507static uint64_t rice_count_exact(int32_t *res, int n, int k)
508{
509 int i;
510 uint64_t count = 0;
511
512 for (i = 0; i < n; i++) {
513 int32_t v = -2 * res[i] - 1;
514 v ^= v >> 31;
515 count += (v >> k) + 1 + k;
516 }
517 return count;
518}
519
520
521static uint64_t subframe_count_exact(FlacEncodeContext *s, FlacSubframe *sub,
522 int pred_order)
523{
524 int p, porder, psize;
525 int i, part_end;
526 uint64_t count = 0;
527
528 /* subframe header */
529 count += 8;
530
531 /* subframe */
532 if (sub->type == FLAC_SUBFRAME_CONSTANT) {
533 count += sub->obits;
534 } else if (sub->type == FLAC_SUBFRAME_VERBATIM) {
535 count += s->frame.blocksize * sub->obits;
536 } else {
537 /* warm-up samples */
538 count += pred_order * sub->obits;
539
540 /* LPC coefficients */
541 if (sub->type == FLAC_SUBFRAME_LPC)
542 count += 4 + 5 + pred_order * s->options.lpc_coeff_precision;
543
544 /* rice-encoded block */
545 count += 2;
546
547 /* partition order */
548 porder = sub->rc.porder;
549 psize = s->frame.blocksize >> porder;
550 count += 4;
551
552 /* residual */
553 i = pred_order;
554 part_end = psize;
555 for (p = 0; p < 1 << porder; p++) {
556 int k = sub->rc.params[p];
557 count += sub->rc.coding_mode;
558 count += rice_count_exact(&sub->residual[i], part_end - i, k);
559 i = part_end;
560 part_end = FFMIN(s->frame.blocksize, part_end + psize);
561 }
562 }
563
564 return count;
565}
566
567
568#define rice_encode_count(sum, n, k) (((n)*((k)+1))+((sum-(n>>1))>>(k)))
569
570/**
571 * Solve for d/dk(rice_encode_count) = n-((sum-(n>>1))>>(k+1)) = 0.
572 */
573static int find_optimal_param(uint64_t sum, int n, int max_param)
574{
575 int k;
576 uint64_t sum2;
577
578 if (sum <= n >> 1)
579 return 0;
580 sum2 = sum - (n >> 1);
581 k = av_log2(av_clipl_int32(sum2 / n));
582 return FFMIN(k, max_param);
583}
584
585
586static uint64_t calc_optimal_rice_params(RiceContext *rc, int porder,
587 uint64_t *sums, int n, int pred_order)
588{
589 int i;
590 int k, cnt, part, max_param;
591 uint64_t all_bits;
592
593 max_param = (1 << rc->coding_mode) - 2;
594
595 part = (1 << porder);
596 all_bits = 4 * part;
597
598 cnt = (n >> porder) - pred_order;
599 for (i = 0; i < part; i++) {
600 k = find_optimal_param(sums[i], cnt, max_param);
601 rc->params[i] = k;
602 all_bits += rice_encode_count(sums[i], cnt, k);
603 cnt = n >> porder;
604 }
605
606 rc->porder = porder;
607
608 return all_bits;
609}
610
611
612static void calc_sums(int pmin, int pmax, uint32_t *data, int n, int pred_order,
613 uint64_t sums[][MAX_PARTITIONS])
614{
615 int i, j;
616 int parts;
617 uint32_t *res, *res_end;
618
619 /* sums for highest level */
620 parts = (1 << pmax);
621 res = &data[pred_order];
622 res_end = &data[n >> pmax];
623 for (i = 0; i < parts; i++) {
624 uint64_t sum = 0;
625 while (res < res_end)
626 sum += *(res++);
627 sums[pmax][i] = sum;
628 res_end += n >> pmax;
629 }
630 /* sums for lower levels */
631 for (i = pmax - 1; i >= pmin; i--) {
632 parts = (1 << i);
633 for (j = 0; j < parts; j++)
634 sums[i][j] = sums[i+1][2*j] + sums[i+1][2*j+1];
635 }
636}
637
638
639static uint64_t calc_rice_params(RiceContext *rc, int pmin, int pmax,
640 int32_t *data, int n, int pred_order)
641{
642 int i;
643 uint64_t bits[MAX_PARTITION_ORDER+1];
644 int opt_porder;
645 RiceContext tmp_rc;
646 uint32_t *udata;
647 uint64_t sums[MAX_PARTITION_ORDER+1][MAX_PARTITIONS];
648
649 av_assert1(pmin >= 0 && pmin <= MAX_PARTITION_ORDER);
650 av_assert1(pmax >= 0 && pmax <= MAX_PARTITION_ORDER);
651 av_assert1(pmin <= pmax);
652
653 tmp_rc.coding_mode = rc->coding_mode;
654
655 udata = av_malloc_array(n, sizeof(uint32_t));
656 for (i = 0; i < n; i++)
657 udata[i] = (2*data[i]) ^ (data[i]>>31);
658
659 calc_sums(pmin, pmax, udata, n, pred_order, sums);
660
661 opt_porder = pmin;
662 bits[pmin] = UINT32_MAX;
663 for (i = pmin; i <= pmax; i++) {
664 bits[i] = calc_optimal_rice_params(&tmp_rc, i, sums[i], n, pred_order);
665 if (bits[i] <= bits[opt_porder]) {
666 opt_porder = i;
667 *rc = tmp_rc;
668 }
669 }
670
671 av_freep(&udata);
672 return bits[opt_porder];
673}
674
675
676static int get_max_p_order(int max_porder, int n, int order)
677{
678 int porder = FFMIN(max_porder, av_log2(n^(n-1)));
679 if (order > 0)
680 porder = FFMIN(porder, av_log2(n/order));
681 return porder;
682}
683
684
685static uint64_t find_subframe_rice_params(FlacEncodeContext *s,
686 FlacSubframe *sub, int pred_order)
687{
688 int pmin = get_max_p_order(s->options.min_partition_order,
689 s->frame.blocksize, pred_order);
690 int pmax = get_max_p_order(s->options.max_partition_order,
691 s->frame.blocksize, pred_order);
692
693 uint64_t bits = 8 + pred_order * sub->obits + 2 + sub->rc.coding_mode;
694 if (sub->type == FLAC_SUBFRAME_LPC)
695 bits += 4 + 5 + pred_order * s->options.lpc_coeff_precision;
696 bits += calc_rice_params(&sub->rc, pmin, pmax, sub->residual,
697 s->frame.blocksize, pred_order);
698 return bits;
699}
700
701
702static void encode_residual_fixed(int32_t *res, const int32_t *smp, int n,
703 int order)
704{
705 int i;
706
707 for (i = 0; i < order; i++)
708 res[i] = smp[i];
709
710 if (order == 0) {
711 for (i = order; i < n; i++)
712 res[i] = smp[i];
713 } else if (order == 1) {
714 for (i = order; i < n; i++)
715 res[i] = smp[i] - smp[i-1];
716 } else if (order == 2) {
717 int a = smp[order-1] - smp[order-2];
718 for (i = order; i < n; i += 2) {
719 int b = smp[i ] - smp[i-1];
720 res[i] = b - a;
721 a = smp[i+1] - smp[i ];
722 res[i+1] = a - b;
723 }
724 } else if (order == 3) {
725 int a = smp[order-1] - smp[order-2];
726 int c = smp[order-1] - 2*smp[order-2] + smp[order-3];
727 for (i = order; i < n; i += 2) {
728 int b = smp[i ] - smp[i-1];
729 int d = b - a;
730 res[i] = d - c;
731 a = smp[i+1] - smp[i ];
732 c = a - b;
733 res[i+1] = c - d;
734 }
735 } else {
736 int a = smp[order-1] - smp[order-2];
737 int c = smp[order-1] - 2*smp[order-2] + smp[order-3];
738 int e = smp[order-1] - 3*smp[order-2] + 3*smp[order-3] - smp[order-4];
739 for (i = order; i < n; i += 2) {
740 int b = smp[i ] - smp[i-1];
741 int d = b - a;
742 int f = d - c;
743 res[i ] = f - e;
744 a = smp[i+1] - smp[i ];
745 c = a - b;
746 e = c - d;
747 res[i+1] = e - f;
748 }
749 }
750}
751
752
753static int encode_residual_ch(FlacEncodeContext *s, int ch)
754{
755 int i, n;
756 int min_order, max_order, opt_order, omethod;
757 FlacFrame *frame;
758 FlacSubframe *sub;
759 int32_t coefs[MAX_LPC_ORDER][MAX_LPC_ORDER];
760 int shift[MAX_LPC_ORDER];
761 int32_t *res, *smp;
762
763 frame = &s->frame;
764 sub = &frame->subframes[ch];
765 res = sub->residual;
766 smp = sub->samples;
767 n = frame->blocksize;
768
769 /* CONSTANT */
770 for (i = 1; i < n; i++)
771 if(smp[i] != smp[0])
772 break;
773 if (i == n) {
774 sub->type = sub->type_code = FLAC_SUBFRAME_CONSTANT;
775 res[0] = smp[0];
776 return subframe_count_exact(s, sub, 0);
777 }
778
779 /* VERBATIM */
780 if (frame->verbatim_only || n < 5) {
781 sub->type = sub->type_code = FLAC_SUBFRAME_VERBATIM;
782 memcpy(res, smp, n * sizeof(int32_t));
783 return subframe_count_exact(s, sub, 0);
784 }
785
786 min_order = s->options.min_prediction_order;
787 max_order = s->options.max_prediction_order;
788 omethod = s->options.prediction_order_method;
789
790 /* FIXED */
791 sub->type = FLAC_SUBFRAME_FIXED;
792 if (s->options.lpc_type == FF_LPC_TYPE_NONE ||
793 s->options.lpc_type == FF_LPC_TYPE_FIXED || n <= max_order) {
794 uint64_t bits[MAX_FIXED_ORDER+1];
795 if (max_order > MAX_FIXED_ORDER)
796 max_order = MAX_FIXED_ORDER;
797 opt_order = 0;
798 bits[0] = UINT32_MAX;
799 for (i = min_order; i <= max_order; i++) {
800 encode_residual_fixed(res, smp, n, i);
801 bits[i] = find_subframe_rice_params(s, sub, i);
802 if (bits[i] < bits[opt_order])
803 opt_order = i;
804 }
805 sub->order = opt_order;
806 sub->type_code = sub->type | sub->order;
807 if (sub->order != max_order) {
808 encode_residual_fixed(res, smp, n, sub->order);
809 find_subframe_rice_params(s, sub, sub->order);
810 }
811 return subframe_count_exact(s, sub, sub->order);
812 }
813
814 /* LPC */
815 sub->type = FLAC_SUBFRAME_LPC;
816 opt_order = ff_lpc_calc_coefs(&s->lpc_ctx, smp, n, min_order, max_order,
817 s->options.lpc_coeff_precision, coefs, shift, s->options.lpc_type,
818 s->options.lpc_passes, omethod,
819 MAX_LPC_SHIFT, 0);
820
821 if (omethod == ORDER_METHOD_2LEVEL ||
822 omethod == ORDER_METHOD_4LEVEL ||
823 omethod == ORDER_METHOD_8LEVEL) {
824 int levels = 1 << omethod;
825 uint64_t bits[1 << ORDER_METHOD_8LEVEL];
826 int order = -1;
827 int opt_index = levels-1;
828 opt_order = max_order-1;
829 bits[opt_index] = UINT32_MAX;
830 for (i = levels-1; i >= 0; i--) {
831 int last_order = order;
832 order = min_order + (((max_order-min_order+1) * (i+1)) / levels)-1;
833 order = av_clip(order, min_order - 1, max_order - 1);
834 if (order == last_order)
835 continue;
836 s->flac_dsp.lpc_encode(res, smp, n, order+1, coefs[order],
837 shift[order]);
838 bits[i] = find_subframe_rice_params(s, sub, order+1);
839 if (bits[i] < bits[opt_index]) {
840 opt_index = i;
841 opt_order = order;
842 }
843 }
844 opt_order++;
845 } else if (omethod == ORDER_METHOD_SEARCH) {
846 // brute-force optimal order search
847 uint64_t bits[MAX_LPC_ORDER];
848 opt_order = 0;
849 bits[0] = UINT32_MAX;
850 for (i = min_order-1; i < max_order; i++) {
851 s->flac_dsp.lpc_encode(res, smp, n, i+1, coefs[i], shift[i]);
852 bits[i] = find_subframe_rice_params(s, sub, i+1);
853 if (bits[i] < bits[opt_order])
854 opt_order = i;
855 }
856 opt_order++;
857 } else if (omethod == ORDER_METHOD_LOG) {
858 uint64_t bits[MAX_LPC_ORDER];
859 int step;
860
861 opt_order = min_order - 1 + (max_order-min_order)/3;
862 memset(bits, -1, sizeof(bits));
863
864 for (step = 16; step; step >>= 1) {
865 int last = opt_order;
866 for (i = last-step; i <= last+step; i += step) {
867 if (i < min_order-1 || i >= max_order || bits[i] < UINT32_MAX)
868 continue;
869 s->flac_dsp.lpc_encode(res, smp, n, i+1, coefs[i], shift[i]);
870 bits[i] = find_subframe_rice_params(s, sub, i+1);
871 if (bits[i] < bits[opt_order])
872 opt_order = i;
873 }
874 }
875 opt_order++;
876 }
877
878 sub->order = opt_order;
879 sub->type_code = sub->type | (sub->order-1);
880 sub->shift = shift[sub->order-1];
881 for (i = 0; i < sub->order; i++)
882 sub->coefs[i] = coefs[sub->order-1][i];
883
884 s->flac_dsp.lpc_encode(res, smp, n, sub->order, sub->coefs, sub->shift);
885
886 find_subframe_rice_params(s, sub, sub->order);
887
888 return subframe_count_exact(s, sub, sub->order);
889}
890
891
892static int count_frame_header(FlacEncodeContext *s)
893{
894 uint8_t av_unused tmp;
895 int count;
896
897 /*
898 <14> Sync code
899 <1> Reserved
900 <1> Blocking strategy
901 <4> Block size in inter-channel samples
902 <4> Sample rate
903 <4> Channel assignment
904 <3> Sample size in bits
905 <1> Reserved
906 */
907 count = 32;
908
909 /* coded frame number */
910 PUT_UTF8(s->frame_count, tmp, count += 8;)
911
912 /* explicit block size */
913 if (s->frame.bs_code[0] == 6)
914 count += 8;
915 else if (s->frame.bs_code[0] == 7)
916 count += 16;
917
918 /* explicit sample rate */
919 count += ((s->sr_code[0] == 12) + (s->sr_code[0] > 12)) * 8;
920
921 /* frame header CRC-8 */
922 count += 8;
923
924 return count;
925}
926
927
928static int encode_frame(FlacEncodeContext *s)
929{
930 int ch;
931 uint64_t count;
932
933 count = count_frame_header(s);
934
935 for (ch = 0; ch < s->channels; ch++)
936 count += encode_residual_ch(s, ch);
937
938 count += (8 - (count & 7)) & 7; // byte alignment
939 count += 16; // CRC-16
940
941 count >>= 3;
942 if (count > INT_MAX)
943 return AVERROR_BUG;
944 return count;
945}
946
947
948static void remove_wasted_bits(FlacEncodeContext *s)
949{
950 int ch, i;
951
952 for (ch = 0; ch < s->channels; ch++) {
953 FlacSubframe *sub = &s->frame.subframes[ch];
954 int32_t v = 0;
955
956 for (i = 0; i < s->frame.blocksize; i++) {
957 v |= sub->samples[i];
958 if (v & 1)
959 break;
960 }
961
962 if (v && !(v & 1)) {
963 v = av_ctz(v);
964
965 for (i = 0; i < s->frame.blocksize; i++)
966 sub->samples[i] >>= v;
967
968 sub->wasted = v;
969 sub->obits -= v;
970
971 /* for 24-bit, check if removing wasted bits makes the range better
972 suited for using RICE instead of RICE2 for entropy coding */
973 if (sub->obits <= 17)
974 sub->rc.coding_mode = CODING_MODE_RICE;
975 }
976 }
977}
978
979
980static int estimate_stereo_mode(int32_t *left_ch, int32_t *right_ch, int n,
981 int max_rice_param)
982{
983 int i, best;
984 int32_t lt, rt;
985 uint64_t sum[4];
986 uint64_t score[4];
987 int k;
988
989 /* calculate sum of 2nd order residual for each channel */
990 sum[0] = sum[1] = sum[2] = sum[3] = 0;
991 for (i = 2; i < n; i++) {
992 lt = left_ch[i] - 2*left_ch[i-1] + left_ch[i-2];
993 rt = right_ch[i] - 2*right_ch[i-1] + right_ch[i-2];
994 sum[2] += FFABS((lt + rt) >> 1);
995 sum[3] += FFABS(lt - rt);
996 sum[0] += FFABS(lt);
997 sum[1] += FFABS(rt);
998 }
999 /* estimate bit counts */
1000 for (i = 0; i < 4; i++) {
1001 k = find_optimal_param(2 * sum[i], n, max_rice_param);
1002 sum[i] = rice_encode_count( 2 * sum[i], n, k);
1003 }
1004
1005 /* calculate score for each mode */
1006 score[0] = sum[0] + sum[1];
1007 score[1] = sum[0] + sum[3];
1008 score[2] = sum[1] + sum[3];
1009 score[3] = sum[2] + sum[3];
1010
1011 /* return mode with lowest score */
1012 best = 0;
1013 for (i = 1; i < 4; i++)
1014 if (score[i] < score[best])
1015 best = i;
1016
1017 return best;
1018}
1019
1020
1021/**
1022 * Perform stereo channel decorrelation.
1023 */
1024static void channel_decorrelation(FlacEncodeContext *s)
1025{
1026 FlacFrame *frame;
1027 int32_t *left, *right;
1028 int i, n;
1029
1030 frame = &s->frame;
1031 n = frame->blocksize;
1032 left = frame->subframes[0].samples;
1033 right = frame->subframes[1].samples;
1034
1035 if (s->channels != 2) {
1036 frame->ch_mode = FLAC_CHMODE_INDEPENDENT;
1037 return;
1038 }
1039
1040 if (s->options.ch_mode < 0) {
1041 int max_rice_param = (1 << frame->subframes[0].rc.coding_mode) - 2;
1042 frame->ch_mode = estimate_stereo_mode(left, right, n, max_rice_param);
1043 } else
1044 frame->ch_mode = s->options.ch_mode;
1045
1046 /* perform decorrelation and adjust bits-per-sample */
1047 if (frame->ch_mode == FLAC_CHMODE_INDEPENDENT)
1048 return;
1049 if (frame->ch_mode == FLAC_CHMODE_MID_SIDE) {
1050 int32_t tmp;
1051 for (i = 0; i < n; i++) {
1052 tmp = left[i];
1053 left[i] = (tmp + right[i]) >> 1;
1054 right[i] = tmp - right[i];
1055 }
1056 frame->subframes[1].obits++;
1057 } else if (frame->ch_mode == FLAC_CHMODE_LEFT_SIDE) {
1058 for (i = 0; i < n; i++)
1059 right[i] = left[i] - right[i];
1060 frame->subframes[1].obits++;
1061 } else {
1062 for (i = 0; i < n; i++)
1063 left[i] -= right[i];
1064 frame->subframes[0].obits++;
1065 }
1066}
1067
1068
1069static void write_utf8(PutBitContext *pb, uint32_t val)
1070{
1071 uint8_t tmp;
1072 PUT_UTF8(val, tmp, put_bits(pb, 8, tmp);)
1073}
1074
1075
1076static void write_frame_header(FlacEncodeContext *s)
1077{
1078 FlacFrame *frame;
1079 int crc;
1080
1081 frame = &s->frame;
1082
1083 put_bits(&s->pb, 16, 0xFFF8);
1084 put_bits(&s->pb, 4, frame->bs_code[0]);
1085 put_bits(&s->pb, 4, s->sr_code[0]);
1086
1087 if (frame->ch_mode == FLAC_CHMODE_INDEPENDENT)
1088 put_bits(&s->pb, 4, s->channels-1);
1089 else
1090 put_bits(&s->pb, 4, frame->ch_mode + FLAC_MAX_CHANNELS - 1);
1091
1092 put_bits(&s->pb, 3, s->bps_code);
1093 put_bits(&s->pb, 1, 0);
1094 write_utf8(&s->pb, s->frame_count);
1095
1096 if (frame->bs_code[0] == 6)
1097 put_bits(&s->pb, 8, frame->bs_code[1]);
1098 else if (frame->bs_code[0] == 7)
1099 put_bits(&s->pb, 16, frame->bs_code[1]);
1100
1101 if (s->sr_code[0] == 12)
1102 put_bits(&s->pb, 8, s->sr_code[1]);
1103 else if (s->sr_code[0] > 12)
1104 put_bits(&s->pb, 16, s->sr_code[1]);
1105
1106 flush_put_bits(&s->pb);
1107 crc = av_crc(av_crc_get_table(AV_CRC_8_ATM), 0, s->pb.buf,
1108 put_bits_count(&s->pb) >> 3);
1109 put_bits(&s->pb, 8, crc);
1110}
1111
1112
1113static void write_subframes(FlacEncodeContext *s)
1114{
1115 int ch;
1116
1117 for (ch = 0; ch < s->channels; ch++) {
1118 FlacSubframe *sub = &s->frame.subframes[ch];
1119 int i, p, porder, psize;
1120 int32_t *part_end;
1121 int32_t *res = sub->residual;
1122 int32_t *frame_end = &sub->residual[s->frame.blocksize];
1123
1124 /* subframe header */
1125 put_bits(&s->pb, 1, 0);
1126 put_bits(&s->pb, 6, sub->type_code);
1127 put_bits(&s->pb, 1, !!sub->wasted);
1128 if (sub->wasted)
1129 put_bits(&s->pb, sub->wasted, 1);
1130
1131 /* subframe */
1132 if (sub->type == FLAC_SUBFRAME_CONSTANT) {
1133 put_sbits(&s->pb, sub->obits, res[0]);
1134 } else if (sub->type == FLAC_SUBFRAME_VERBATIM) {
1135 while (res < frame_end)
1136 put_sbits(&s->pb, sub->obits, *res++);
1137 } else {
1138 /* warm-up samples */
1139 for (i = 0; i < sub->order; i++)
1140 put_sbits(&s->pb, sub->obits, *res++);
1141
1142 /* LPC coefficients */
1143 if (sub->type == FLAC_SUBFRAME_LPC) {
1144 int cbits = s->options.lpc_coeff_precision;
1145 put_bits( &s->pb, 4, cbits-1);
1146 put_sbits(&s->pb, 5, sub->shift);
1147 for (i = 0; i < sub->order; i++)
1148 put_sbits(&s->pb, cbits, sub->coefs[i]);
1149 }
1150
1151 /* rice-encoded block */
1152 put_bits(&s->pb, 2, sub->rc.coding_mode - 4);
1153
1154 /* partition order */
1155 porder = sub->rc.porder;
1156 psize = s->frame.blocksize >> porder;
1157 put_bits(&s->pb, 4, porder);
1158
1159 /* residual */
1160 part_end = &sub->residual[psize];
1161 for (p = 0; p < 1 << porder; p++) {
1162 int k = sub->rc.params[p];
1163 put_bits(&s->pb, sub->rc.coding_mode, k);
1164 while (res < part_end)
1165 set_sr_golomb_flac(&s->pb, *res++, k, INT32_MAX, 0);
1166 part_end = FFMIN(frame_end, part_end + psize);
1167 }
1168 }
1169 }
1170}
1171
1172
1173static void write_frame_footer(FlacEncodeContext *s)
1174{
1175 int crc;
1176 flush_put_bits(&s->pb);
1177 crc = av_bswap16(av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0, s->pb.buf,
1178 put_bits_count(&s->pb)>>3));
1179 put_bits(&s->pb, 16, crc);
1180 flush_put_bits(&s->pb);
1181}
1182
1183
1184static int write_frame(FlacEncodeContext *s, AVPacket *avpkt)
1185{
1186 init_put_bits(&s->pb, avpkt->data, avpkt->size);
1187 write_frame_header(s);
1188 write_subframes(s);
1189 write_frame_footer(s);
1190 return put_bits_count(&s->pb) >> 3;
1191}
1192
1193
1194static int update_md5_sum(FlacEncodeContext *s, const void *samples)
1195{
1196 const uint8_t *buf;
1197 int buf_size = s->frame.blocksize * s->channels *
1198 ((s->avctx->bits_per_raw_sample + 7) / 8);
1199
1200 if (s->avctx->bits_per_raw_sample > 16 || HAVE_BIGENDIAN) {
1201 av_fast_malloc(&s->md5_buffer, &s->md5_buffer_size, buf_size);
1202 if (!s->md5_buffer)
1203 return AVERROR(ENOMEM);
1204 }
1205
1206 if (s->avctx->bits_per_raw_sample <= 16) {
1207 buf = (const uint8_t *)samples;
1208#if HAVE_BIGENDIAN
1209 s->bdsp.bswap16_buf((uint16_t *) s->md5_buffer,
1210 (const uint16_t *) samples, buf_size / 2);
1211 buf = s->md5_buffer;
1212#endif
1213 } else {
1214 int i;
1215 const int32_t *samples0 = samples;
1216 uint8_t *tmp = s->md5_buffer;
1217
1218 for (i = 0; i < s->frame.blocksize * s->channels; i++) {
1219 int32_t v = samples0[i] >> 8;
1220 *tmp++ = (v ) & 0xFF;
1221 *tmp++ = (v >> 8) & 0xFF;
1222 *tmp++ = (v >> 16) & 0xFF;
1223 }
1224 buf = s->md5_buffer;
1225 }
1226 av_md5_update(s->md5ctx, buf, buf_size);
1227
1228 return 0;
1229}
1230
1231
1232static int flac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
1233 const AVFrame *frame, int *got_packet_ptr)
1234{
1235 FlacEncodeContext *s;
1236 int frame_bytes, out_bytes, ret;
1237
1238 s = avctx->priv_data;
1239
1240 /* when the last block is reached, update the header in extradata */
1241 if (!frame) {
1242 s->max_framesize = s->max_encoded_framesize;
1243 av_md5_final(s->md5ctx, s->md5sum);
1244 write_streaminfo(s, avctx->extradata);
1245
1246 if (avctx->side_data_only_packets && !s->flushed) {
1247 uint8_t *side_data = av_packet_new_side_data(avpkt, AV_PKT_DATA_NEW_EXTRADATA,
1248 avctx->extradata_size);
1249 if (!side_data)
1250 return AVERROR(ENOMEM);
1251 memcpy(side_data, avctx->extradata, avctx->extradata_size);
1252
1253 avpkt->pts = s->next_pts;
1254
1255 *got_packet_ptr = 1;
1256 s->flushed = 1;
1257 }
1258
1259 return 0;
1260 }
1261
1262 /* change max_framesize for small final frame */
1263 if (frame->nb_samples < s->frame.blocksize) {
1264 s->max_framesize = ff_flac_get_max_frame_size(frame->nb_samples,
1265 s->channels,
1266 avctx->bits_per_raw_sample);
1267 }
1268
1269 init_frame(s, frame->nb_samples);
1270
1271 copy_samples(s, frame->data[0]);
1272
1273 channel_decorrelation(s);
1274
1275 remove_wasted_bits(s);
1276
1277 frame_bytes = encode_frame(s);
1278
1279 /* Fall back on verbatim mode if the compressed frame is larger than it
1280 would be if encoded uncompressed. */
1281 if (frame_bytes < 0 || frame_bytes > s->max_framesize) {
1282 s->frame.verbatim_only = 1;
1283 frame_bytes = encode_frame(s);
1284 if (frame_bytes < 0) {
1285 av_log(avctx, AV_LOG_ERROR, "Bad frame count\n");
1286 return frame_bytes;
1287 }
1288 }
1289
1290 if ((ret = ff_alloc_packet2(avctx, avpkt, frame_bytes)) < 0)
1291 return ret;
1292
1293 out_bytes = write_frame(s, avpkt);
1294
1295 s->frame_count++;
1296 s->sample_count += frame->nb_samples;
1297 if ((ret = update_md5_sum(s, frame->data[0])) < 0) {
1298 av_log(avctx, AV_LOG_ERROR, "Error updating MD5 checksum\n");
1299 return ret;
1300 }
1301 if (out_bytes > s->max_encoded_framesize)
1302 s->max_encoded_framesize = out_bytes;
1303 if (out_bytes < s->min_framesize)
1304 s->min_framesize = out_bytes;
1305
1306 avpkt->pts = frame->pts;
1307 avpkt->duration = ff_samples_to_time_base(avctx, frame->nb_samples);
1308 avpkt->size = out_bytes;
1309
1310 s->next_pts = avpkt->pts + avpkt->duration;
1311
1312 *got_packet_ptr = 1;
1313 return 0;
1314}
1315
1316
1317static av_cold int flac_encode_close(AVCodecContext *avctx)
1318{
1319 if (avctx->priv_data) {
1320 FlacEncodeContext *s = avctx->priv_data;
1321 av_freep(&s->md5ctx);
1322 av_freep(&s->md5_buffer);
1323 ff_lpc_end(&s->lpc_ctx);
1324 }
1325 av_freep(&avctx->extradata);
1326 avctx->extradata_size = 0;
1327 return 0;
1328}
1329
1330#define FLAGS AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM
1331static const AVOption options[] = {
1332{ "lpc_coeff_precision", "LPC coefficient precision", offsetof(FlacEncodeContext, options.lpc_coeff_precision), AV_OPT_TYPE_INT, {.i64 = 15 }, 0, MAX_LPC_PRECISION, FLAGS },
1333{ "lpc_type", "LPC algorithm", offsetof(FlacEncodeContext, options.lpc_type), AV_OPT_TYPE_INT, {.i64 = FF_LPC_TYPE_DEFAULT }, FF_LPC_TYPE_DEFAULT, FF_LPC_TYPE_NB-1, FLAGS, "lpc_type" },
1334{ "none", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_NONE }, INT_MIN, INT_MAX, FLAGS, "lpc_type" },
1335{ "fixed", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_FIXED }, INT_MIN, INT_MAX, FLAGS, "lpc_type" },
1336{ "levinson", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_LEVINSON }, INT_MIN, INT_MAX, FLAGS, "lpc_type" },
1337{ "cholesky", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_CHOLESKY }, INT_MIN, INT_MAX, FLAGS, "lpc_type" },
1338{ "lpc_passes", "Number of passes to use for Cholesky factorization during LPC analysis", offsetof(FlacEncodeContext, options.lpc_passes), AV_OPT_TYPE_INT, {.i64 = 2 }, 1, INT_MAX, FLAGS },
1339{ "min_partition_order", NULL, offsetof(FlacEncodeContext, options.min_partition_order), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, MAX_PARTITION_ORDER, FLAGS },
1340{ "max_partition_order", NULL, offsetof(FlacEncodeContext, options.max_partition_order), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, MAX_PARTITION_ORDER, FLAGS },
1341{ "prediction_order_method", "Search method for selecting prediction order", offsetof(FlacEncodeContext, options.prediction_order_method), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, ORDER_METHOD_LOG, FLAGS, "predm" },
1342{ "estimation", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_EST }, INT_MIN, INT_MAX, FLAGS, "predm" },
1343{ "2level", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_2LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" },
1344{ "4level", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_4LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" },
1345{ "8level", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_8LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" },
1346{ "search", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_SEARCH }, INT_MIN, INT_MAX, FLAGS, "predm" },
1347{ "log", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_LOG }, INT_MIN, INT_MAX, FLAGS, "predm" },
1348{ "ch_mode", "Stereo decorrelation mode", offsetof(FlacEncodeContext, options.ch_mode), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, FLAC_CHMODE_MID_SIDE, FLAGS, "ch_mode" },
1349{ "auto", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = -1 }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
1350{ "indep", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_INDEPENDENT }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
1351{ "left_side", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_LEFT_SIDE }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
1352{ "right_side", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_RIGHT_SIDE }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
1353{ "mid_side", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_MID_SIDE }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
1354{ NULL },
1355};
1356
1357static const AVClass flac_encoder_class = {
1358 "FLAC encoder",
1359 av_default_item_name,
1360 options,
1361 LIBAVUTIL_VERSION_INT,
1362};
1363
1364AVCodec ff_flac_encoder = {
1365 .name = "flac",
1366 .long_name = NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"),
1367 .type = AVMEDIA_TYPE_AUDIO,
1368 .id = AV_CODEC_ID_FLAC,
1369 .priv_data_size = sizeof(FlacEncodeContext),
1370 .init = flac_encode_init,
1371 .encode2 = flac_encode_frame,
1372 .close = flac_encode_close,
1373 .capabilities = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY | CODEC_CAP_LOSSLESS,
1374 .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
1375 AV_SAMPLE_FMT_S32,
1376 AV_SAMPLE_FMT_NONE },
1377 .priv_class = &flac_encoder_class,
1378};