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
48 enum CodingMode {
49 CODING_MODE_RICE = 4,
50 CODING_MODE_RICE2 = 5,
51 };
52
53 typedef 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
67 typedef struct RiceContext {
68 enum CodingMode coding_mode;
69 int porder;
70 int params[MAX_PARTITIONS];
71 } RiceContext;
72
73 typedef 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
86 typedef 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
95 typedef 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 */
write_streaminfo(FlacEncodeContext * s,uint8_t * header)127 static 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 & LLN(0xFFFFFF000)) >> 12);
144 put_bits(&pb, 12, s->sample_count & LLN(0x000000FFF));
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 */
select_blocksize(int samplerate,int block_time_ms)154 static 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
dprint_compression_options(FlacEncodeContext * s)173 static 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
flac_encode_init(AVCodecContext * avctx)231 static 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 s->options.min_prediction_order = ((int[]){ 2, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1})[level];
312 s->options.max_prediction_order = ((int[]){ 3, 4, 4, 6, 8, 8, 8, 8, 12, 12, 12, 32, 32})[level];
313
314 if (s->options.prediction_order_method < 0)
315 s->options.prediction_order_method = ((int[]){ ORDER_METHOD_EST, ORDER_METHOD_EST, ORDER_METHOD_EST,
316 ORDER_METHOD_EST, ORDER_METHOD_EST, ORDER_METHOD_EST,
317 ORDER_METHOD_4LEVEL, ORDER_METHOD_LOG, ORDER_METHOD_4LEVEL,
318 ORDER_METHOD_LOG, ORDER_METHOD_SEARCH, ORDER_METHOD_LOG,
319 ORDER_METHOD_SEARCH})[level];
320
321 if (s->options.min_partition_order > s->options.max_partition_order) {
322 av_log(avctx, AV_LOG_ERROR, "invalid partition orders: min=%d max=%d\n",
323 s->options.min_partition_order, s->options.max_partition_order);
324 return AVERROR(EINVAL);
325 }
326 if (s->options.min_partition_order < 0)
327 s->options.min_partition_order = ((int[]){ 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0})[level];
328 if (s->options.max_partition_order < 0)
329 s->options.max_partition_order = ((int[]){ 2, 2, 3, 3, 3, 8, 8, 8, 8, 8, 8, 8, 8})[level];
330
331 if (s->options.lpc_type == FF_LPC_TYPE_NONE) {
332 s->options.min_prediction_order = 0;
333 } else if (avctx->min_prediction_order >= 0) {
334 if (s->options.lpc_type == FF_LPC_TYPE_FIXED) {
335 if (avctx->min_prediction_order > MAX_FIXED_ORDER) {
336 av_log(avctx, AV_LOG_ERROR, "invalid min prediction order: %d\n",
337 avctx->min_prediction_order);
338 return AVERROR(EINVAL);
339 }
340 } else if (avctx->min_prediction_order < MIN_LPC_ORDER ||
341 avctx->min_prediction_order > MAX_LPC_ORDER) {
342 av_log(avctx, AV_LOG_ERROR, "invalid min prediction order: %d\n",
343 avctx->min_prediction_order);
344 return AVERROR(EINVAL);
345 }
346 s->options.min_prediction_order = avctx->min_prediction_order;
347 }
348 if (s->options.lpc_type == FF_LPC_TYPE_NONE) {
349 s->options.max_prediction_order = 0;
350 } else if (avctx->max_prediction_order >= 0) {
351 if (s->options.lpc_type == FF_LPC_TYPE_FIXED) {
352 if (avctx->max_prediction_order > MAX_FIXED_ORDER) {
353 av_log(avctx, AV_LOG_ERROR, "invalid max prediction order: %d\n",
354 avctx->max_prediction_order);
355 return AVERROR(EINVAL);
356 }
357 } else if (avctx->max_prediction_order < MIN_LPC_ORDER ||
358 avctx->max_prediction_order > MAX_LPC_ORDER) {
359 av_log(avctx, AV_LOG_ERROR, "invalid max prediction order: %d\n",
360 avctx->max_prediction_order);
361 return AVERROR(EINVAL);
362 }
363 s->options.max_prediction_order = avctx->max_prediction_order;
364 }
365 if (s->options.max_prediction_order < s->options.min_prediction_order) {
366 av_log(avctx, AV_LOG_ERROR, "invalid prediction orders: min=%d max=%d\n",
367 s->options.min_prediction_order, s->options.max_prediction_order);
368 return AVERROR(EINVAL);
369 }
370
371 if (avctx->frame_size > 0) {
372 if (avctx->frame_size < FLAC_MIN_BLOCKSIZE ||
373 avctx->frame_size > FLAC_MAX_BLOCKSIZE) {
374 av_log(avctx, AV_LOG_ERROR, "invalid block size: %d\n",
375 avctx->frame_size);
376 return AVERROR(EINVAL);
377 }
378 } else {
379 s->avctx->frame_size = select_blocksize(s->samplerate, s->options.block_time_ms);
380 }
381 s->max_blocksize = s->avctx->frame_size;
382
383 /* set maximum encoded frame size in verbatim mode */
384 s->max_framesize = ff_flac_get_max_frame_size(s->avctx->frame_size,
385 s->channels,
386 s->avctx->bits_per_raw_sample);
387
388 /* initialize MD5 context */
389 s->md5ctx = av_md5_alloc();
390 if (!s->md5ctx)
391 return AVERROR(ENOMEM);
392 av_md5_init(s->md5ctx);
393
394 streaminfo = av_malloc(FLAC_STREAMINFO_SIZE);
395 if (!streaminfo)
396 return AVERROR(ENOMEM);
397 write_streaminfo(s, streaminfo);
398 avctx->extradata = streaminfo;
399 avctx->extradata_size = FLAC_STREAMINFO_SIZE;
400
401 s->frame_count = 0;
402 s->min_framesize = s->max_framesize;
403
404 if (channels == 3 &&
405 avctx->channel_layout != (AV_CH_LAYOUT_STEREO|AV_CH_FRONT_CENTER) ||
406 channels == 4 &&
407 avctx->channel_layout != AV_CH_LAYOUT_2_2 &&
408 avctx->channel_layout != AV_CH_LAYOUT_QUAD ||
409 channels == 5 &&
410 avctx->channel_layout != AV_CH_LAYOUT_5POINT0 &&
411 avctx->channel_layout != AV_CH_LAYOUT_5POINT0_BACK ||
412 channels == 6 &&
413 avctx->channel_layout != AV_CH_LAYOUT_5POINT1 &&
414 avctx->channel_layout != AV_CH_LAYOUT_5POINT1_BACK) {
415 if (avctx->channel_layout) {
416 av_log(avctx, AV_LOG_ERROR, "Channel layout not supported by Flac, "
417 "output stream will have incorrect "
418 "channel layout.\n");
419 } else {
420 av_log(avctx, AV_LOG_WARNING, "No channel layout specified. The encoder "
421 "will use Flac channel layout for "
422 "%d channels.\n", channels);
423 }
424 }
425
426 ret = ff_lpc_init(&s->lpc_ctx, avctx->frame_size,
427 s->options.max_prediction_order, FF_LPC_TYPE_LEVINSON);
428
429 ff_bswapdsp_init(&s->bdsp);
430 ff_flacdsp_init(&s->flac_dsp, avctx->sample_fmt,
431 avctx->bits_per_raw_sample);
432
433 dprint_compression_options(s);
434
435 return ret;
436 }
437
438
init_frame(FlacEncodeContext * s,int nb_samples)439 static void init_frame(FlacEncodeContext *s, int nb_samples)
440 {
441 int i, ch;
442 FlacFrame *frame;
443
444 frame = &s->frame;
445
446 for (i = 0; i < 16; i++) {
447 if (nb_samples == ff_flac_blocksize_table[i]) {
448 frame->blocksize = ff_flac_blocksize_table[i];
449 frame->bs_code[0] = i;
450 frame->bs_code[1] = 0;
451 break;
452 }
453 }
454 if (i == 16) {
455 frame->blocksize = nb_samples;
456 if (frame->blocksize <= 256) {
457 frame->bs_code[0] = 6;
458 frame->bs_code[1] = frame->blocksize-1;
459 } else {
460 frame->bs_code[0] = 7;
461 frame->bs_code[1] = frame->blocksize-1;
462 }
463 }
464
465 for (ch = 0; ch < s->channels; ch++) {
466 FlacSubframe *sub = &frame->subframes[ch];
467
468 sub->wasted = 0;
469 sub->obits = s->avctx->bits_per_raw_sample;
470
471 if (sub->obits > 16)
472 sub->rc.coding_mode = CODING_MODE_RICE2;
473 else
474 sub->rc.coding_mode = CODING_MODE_RICE;
475 }
476
477 frame->verbatim_only = 0;
478 }
479
480
481 /**
482 * Copy channel-interleaved input samples into separate subframes.
483 */
copy_samples(FlacEncodeContext * s,const void * samples)484 static void copy_samples(FlacEncodeContext *s, const void *samples)
485 {
486 int i, j, ch;
487 FlacFrame *frame;
488 int shift = av_get_bytes_per_sample(s->avctx->sample_fmt) * 8 -
489 s->avctx->bits_per_raw_sample;
490
491 #define COPY_SAMPLES(bits) do { \
492 const int ## bits ## _t *samples0 = samples; \
493 frame = &s->frame; \
494 for (i = 0, j = 0; i < frame->blocksize; i++) \
495 for (ch = 0; ch < s->channels; ch++, j++) \
496 frame->subframes[ch].samples[i] = samples0[j] >> shift; \
497 } while (0)
498
499 if (s->avctx->sample_fmt == AV_SAMPLE_FMT_S16)
500 COPY_SAMPLES(16);
501 else
502 COPY_SAMPLES(32);
503 }
504
505
rice_count_exact(int32_t * res,int n,int k)506 static uint64_t rice_count_exact(int32_t *res, int n, int k)
507 {
508 int i;
509 uint64_t count = 0;
510
511 for (i = 0; i < n; i++) {
512 int32_t v = -2 * res[i] - 1;
513 v ^= v >> 31;
514 count += (v >> k) + 1 + k;
515 }
516 return count;
517 }
518
519
subframe_count_exact(FlacEncodeContext * s,FlacSubframe * sub,int pred_order)520 static uint64_t subframe_count_exact(FlacEncodeContext *s, FlacSubframe *sub,
521 int pred_order)
522 {
523 int p, porder, psize;
524 int i, part_end;
525 uint64_t count = 0;
526
527 /* subframe header */
528 count += 8;
529
530 /* subframe */
531 if (sub->type == FLAC_SUBFRAME_CONSTANT) {
532 count += sub->obits;
533 } else if (sub->type == FLAC_SUBFRAME_VERBATIM) {
534 count += s->frame.blocksize * sub->obits;
535 } else {
536 /* warm-up samples */
537 count += pred_order * sub->obits;
538
539 /* LPC coefficients */
540 if (sub->type == FLAC_SUBFRAME_LPC)
541 count += 4 + 5 + pred_order * s->options.lpc_coeff_precision;
542
543 /* rice-encoded block */
544 count += 2;
545
546 /* partition order */
547 porder = sub->rc.porder;
548 psize = s->frame.blocksize >> porder;
549 count += 4;
550
551 /* residual */
552 i = pred_order;
553 part_end = psize;
554 for (p = 0; p < 1 << porder; p++) {
555 int k = sub->rc.params[p];
556 count += sub->rc.coding_mode;
557 count += rice_count_exact(&sub->residual[i], part_end - i, k);
558 i = part_end;
559 part_end = FFMIN(s->frame.blocksize, part_end + psize);
560 }
561 }
562
563 return count;
564 }
565
566
567 #define rice_encode_count(sum, n, k) (((n)*((k)+1))+((sum-(n>>1))>>(k)))
568
569 /**
570 * Solve for d/dk(rice_encode_count) = n-((sum-(n>>1))>>(k+1)) = 0.
571 */
find_optimal_param(uint64_t sum,int n,int max_param)572 static int find_optimal_param(uint64_t sum, int n, int max_param)
573 {
574 int k;
575 uint64_t sum2;
576
577 if (sum <= n >> 1)
578 return 0;
579 sum2 = sum - (n >> 1);
580 k = av_log2(av_clipl_int32(sum2 / n));
581 return FFMIN(k, max_param);
582 }
583
584
calc_optimal_rice_params(RiceContext * rc,int porder,uint64_t * sums,int n,int pred_order)585 static uint64_t calc_optimal_rice_params(RiceContext *rc, int porder,
586 uint64_t *sums, int n, int pred_order)
587 {
588 int i;
589 int k, cnt, part, max_param;
590 uint64_t all_bits;
591
592 max_param = (1 << rc->coding_mode) - 2;
593
594 part = (1 << porder);
595 all_bits = 4 * part;
596
597 cnt = (n >> porder) - pred_order;
598 for (i = 0; i < part; i++) {
599 k = find_optimal_param(sums[i], cnt, max_param);
600 rc->params[i] = k;
601 all_bits += rice_encode_count(sums[i], cnt, k);
602 cnt = n >> porder;
603 }
604
605 rc->porder = porder;
606
607 return all_bits;
608 }
609
610
calc_sums(int pmin,int pmax,uint32_t * data,int n,int pred_order,uint64_t sums[][MAX_PARTITIONS])611 static void calc_sums(int pmin, int pmax, uint32_t *data, int n, int pred_order,
612 uint64_t sums[][MAX_PARTITIONS])
613 {
614 int i, j;
615 int parts;
616 uint32_t *res, *res_end;
617
618 /* sums for highest level */
619 parts = (1 << pmax);
620 res = &data[pred_order];
621 res_end = &data[n >> pmax];
622 for (i = 0; i < parts; i++) {
623 uint64_t sum = 0;
624 while (res < res_end)
625 sum += *(res++);
626 sums[pmax][i] = sum;
627 res_end += n >> pmax;
628 }
629 /* sums for lower levels */
630 for (i = pmax - 1; i >= pmin; i--) {
631 parts = (1 << i);
632 for (j = 0; j < parts; j++)
633 sums[i][j] = sums[i+1][2*j] + sums[i+1][2*j+1];
634 }
635 }
636
637
calc_rice_params(RiceContext * rc,int pmin,int pmax,int32_t * data,int n,int pred_order)638 static uint64_t calc_rice_params(RiceContext *rc, int pmin, int pmax,
639 int32_t *data, int n, int pred_order)
640 {
641 int i;
642 uint64_t bits[MAX_PARTITION_ORDER+1];
643 int opt_porder;
644 RiceContext tmp_rc;
645 uint32_t *udata;
646 uint64_t sums[MAX_PARTITION_ORDER+1][MAX_PARTITIONS];
647
648 av_assert1(pmin >= 0 && pmin <= MAX_PARTITION_ORDER);
649 av_assert1(pmax >= 0 && pmax <= MAX_PARTITION_ORDER);
650 av_assert1(pmin <= pmax);
651
652 tmp_rc.coding_mode = rc->coding_mode;
653
654 udata = av_malloc_array(n, sizeof(uint32_t));
655 for (i = 0; i < n; i++)
656 udata[i] = (2*data[i]) ^ (data[i]>>31);
657
658 calc_sums(pmin, pmax, udata, n, pred_order, sums);
659
660 opt_porder = pmin;
661 bits[pmin] = UINT32_MAX;
662 for (i = pmin; i <= pmax; i++) {
663 bits[i] = calc_optimal_rice_params(&tmp_rc, i, sums[i], n, pred_order);
664 if (bits[i] <= bits[opt_porder]) {
665 opt_porder = i;
666 *rc = tmp_rc;
667 }
668 }
669
670 av_freep(&udata);
671 return bits[opt_porder];
672 }
673
674
get_max_p_order(int max_porder,int n,int order)675 static int get_max_p_order(int max_porder, int n, int order)
676 {
677 int porder = FFMIN(max_porder, av_log2(n^(n-1)));
678 if (order > 0)
679 porder = FFMIN(porder, av_log2(n/order));
680 return porder;
681 }
682
683
find_subframe_rice_params(FlacEncodeContext * s,FlacSubframe * sub,int pred_order)684 static uint64_t find_subframe_rice_params(FlacEncodeContext *s,
685 FlacSubframe *sub, int pred_order)
686 {
687 int pmin = get_max_p_order(s->options.min_partition_order,
688 s->frame.blocksize, pred_order);
689 int pmax = get_max_p_order(s->options.max_partition_order,
690 s->frame.blocksize, pred_order);
691
692 uint64_t bits = 8 + pred_order * sub->obits + 2 + sub->rc.coding_mode;
693 if (sub->type == FLAC_SUBFRAME_LPC)
694 bits += 4 + 5 + pred_order * s->options.lpc_coeff_precision;
695 bits += calc_rice_params(&sub->rc, pmin, pmax, sub->residual,
696 s->frame.blocksize, pred_order);
697 return bits;
698 }
699
700
encode_residual_fixed(int32_t * res,const int32_t * smp,int n,int order)701 static void encode_residual_fixed(int32_t *res, const int32_t *smp, int n,
702 int order)
703 {
704 int i;
705
706 for (i = 0; i < order; i++)
707 res[i] = smp[i];
708
709 if (order == 0) {
710 for (i = order; i < n; i++)
711 res[i] = smp[i];
712 } else if (order == 1) {
713 for (i = order; i < n; i++)
714 res[i] = smp[i] - smp[i-1];
715 } else if (order == 2) {
716 int a = smp[order-1] - smp[order-2];
717 for (i = order; i < n; i += 2) {
718 int b = smp[i ] - smp[i-1];
719 res[i] = b - a;
720 a = smp[i+1] - smp[i ];
721 res[i+1] = a - b;
722 }
723 } else if (order == 3) {
724 int a = smp[order-1] - smp[order-2];
725 int c = smp[order-1] - 2*smp[order-2] + smp[order-3];
726 for (i = order; i < n; i += 2) {
727 int b = smp[i ] - smp[i-1];
728 int d = b - a;
729 res[i] = d - c;
730 a = smp[i+1] - smp[i ];
731 c = a - b;
732 res[i+1] = c - d;
733 }
734 } else {
735 int a = smp[order-1] - smp[order-2];
736 int c = smp[order-1] - 2*smp[order-2] + smp[order-3];
737 int e = smp[order-1] - 3*smp[order-2] + 3*smp[order-3] - smp[order-4];
738 for (i = order; i < n; i += 2) {
739 int b = smp[i ] - smp[i-1];
740 int d = b - a;
741 int f = d - c;
742 res[i ] = f - e;
743 a = smp[i+1] - smp[i ];
744 c = a - b;
745 e = c - d;
746 res[i+1] = e - f;
747 }
748 }
749 }
750
751
encode_residual_ch(FlacEncodeContext * s,int ch)752 static int encode_residual_ch(FlacEncodeContext *s, int ch)
753 {
754 int i, n;
755 int min_order, max_order, opt_order, omethod;
756 FlacFrame *frame;
757 FlacSubframe *sub;
758 int32_t coefs[MAX_LPC_ORDER][MAX_LPC_ORDER];
759 int shift[MAX_LPC_ORDER];
760 int32_t *res, *smp;
761
762 frame = &s->frame;
763 sub = &frame->subframes[ch];
764 res = sub->residual;
765 smp = sub->samples;
766 n = frame->blocksize;
767
768 /* CONSTANT */
769 for (i = 1; i < n; i++)
770 if(smp[i] != smp[0])
771 break;
772 if (i == n) {
773 sub->type = sub->type_code = FLAC_SUBFRAME_CONSTANT;
774 res[0] = smp[0];
775 return subframe_count_exact(s, sub, 0);
776 }
777
778 /* VERBATIM */
779 if (frame->verbatim_only || n < 5) {
780 sub->type = sub->type_code = FLAC_SUBFRAME_VERBATIM;
781 memcpy(res, smp, n * sizeof(int32_t));
782 return subframe_count_exact(s, sub, 0);
783 }
784
785 min_order = s->options.min_prediction_order;
786 max_order = s->options.max_prediction_order;
787 omethod = s->options.prediction_order_method;
788
789 /* FIXED */
790 sub->type = FLAC_SUBFRAME_FIXED;
791 if (s->options.lpc_type == FF_LPC_TYPE_NONE ||
792 s->options.lpc_type == FF_LPC_TYPE_FIXED || n <= max_order) {
793 uint64_t bits[MAX_FIXED_ORDER+1];
794 if (max_order > MAX_FIXED_ORDER)
795 max_order = MAX_FIXED_ORDER;
796 opt_order = 0;
797 bits[0] = UINT32_MAX;
798 for (i = min_order; i <= max_order; i++) {
799 encode_residual_fixed(res, smp, n, i);
800 bits[i] = find_subframe_rice_params(s, sub, i);
801 if (bits[i] < bits[opt_order])
802 opt_order = i;
803 }
804 sub->order = opt_order;
805 sub->type_code = sub->type | sub->order;
806 if (sub->order != max_order) {
807 encode_residual_fixed(res, smp, n, sub->order);
808 find_subframe_rice_params(s, sub, sub->order);
809 }
810 return subframe_count_exact(s, sub, sub->order);
811 }
812
813 /* LPC */
814 sub->type = FLAC_SUBFRAME_LPC;
815 opt_order = ff_lpc_calc_coefs(&s->lpc_ctx, smp, n, min_order, max_order,
816 s->options.lpc_coeff_precision, coefs, shift, s->options.lpc_type,
817 s->options.lpc_passes, omethod,
818 MAX_LPC_SHIFT, 0);
819
820 if (omethod == ORDER_METHOD_2LEVEL ||
821 omethod == ORDER_METHOD_4LEVEL ||
822 omethod == ORDER_METHOD_8LEVEL) {
823 int levels = 1 << omethod;
824 uint64_t bits[1 << ORDER_METHOD_8LEVEL];
825 int order = -1;
826 int opt_index = levels-1;
827 opt_order = max_order-1;
828 bits[opt_index] = UINT32_MAX;
829 for (i = levels-1; i >= 0; i--) {
830 int last_order = order;
831 order = min_order + (((max_order-min_order+1) * (i+1)) / levels)-1;
832 order = av_clip(order, min_order - 1, max_order - 1);
833 if (order == last_order)
834 continue;
835 s->flac_dsp.lpc_encode(res, smp, n, order+1, coefs[order],
836 shift[order]);
837 bits[i] = find_subframe_rice_params(s, sub, order+1);
838 if (bits[i] < bits[opt_index]) {
839 opt_index = i;
840 opt_order = order;
841 }
842 }
843 opt_order++;
844 } else if (omethod == ORDER_METHOD_SEARCH) {
845 // brute-force optimal order search
846 uint64_t bits[MAX_LPC_ORDER];
847 opt_order = 0;
848 bits[0] = UINT32_MAX;
849 for (i = min_order-1; i < max_order; i++) {
850 s->flac_dsp.lpc_encode(res, smp, n, i+1, coefs[i], shift[i]);
851 bits[i] = find_subframe_rice_params(s, sub, i+1);
852 if (bits[i] < bits[opt_order])
853 opt_order = i;
854 }
855 opt_order++;
856 } else if (omethod == ORDER_METHOD_LOG) {
857 uint64_t bits[MAX_LPC_ORDER];
858 int step;
859
860 opt_order = min_order - 1 + (max_order-min_order)/3;
861 memset(bits, -1, sizeof(bits));
862
863 for (step = 16; step; step >>= 1) {
864 int last = opt_order;
865 for (i = last-step; i <= last+step; i += step) {
866 if (i < min_order-1 || i >= max_order || bits[i] < UINT32_MAX)
867 continue;
868 s->flac_dsp.lpc_encode(res, smp, n, i+1, coefs[i], shift[i]);
869 bits[i] = find_subframe_rice_params(s, sub, i+1);
870 if (bits[i] < bits[opt_order])
871 opt_order = i;
872 }
873 }
874 opt_order++;
875 }
876
877 sub->order = opt_order;
878 sub->type_code = sub->type | (sub->order-1);
879 sub->shift = shift[sub->order-1];
880 for (i = 0; i < sub->order; i++)
881 sub->coefs[i] = coefs[sub->order-1][i];
882
883 s->flac_dsp.lpc_encode(res, smp, n, sub->order, sub->coefs, sub->shift);
884
885 find_subframe_rice_params(s, sub, sub->order);
886
887 return subframe_count_exact(s, sub, sub->order);
888 }
889
890
count_frame_header(FlacEncodeContext * s)891 static int count_frame_header(FlacEncodeContext *s)
892 {
893 uint8_t av_unused tmp;
894 int count;
895
896 /*
897 <14> Sync code
898 <1> Reserved
899 <1> Blocking strategy
900 <4> Block size in inter-channel samples
901 <4> Sample rate
902 <4> Channel assignment
903 <3> Sample size in bits
904 <1> Reserved
905 */
906 count = 32;
907
908 /* coded frame number */
909 PUT_UTF8(s->frame_count, tmp, count += 8;)
910
911 /* explicit block size */
912 if (s->frame.bs_code[0] == 6)
913 count += 8;
914 else if (s->frame.bs_code[0] == 7)
915 count += 16;
916
917 /* explicit sample rate */
918 count += ((s->sr_code[0] == 12) + (s->sr_code[0] > 12)) * 8;
919
920 /* frame header CRC-8 */
921 count += 8;
922
923 return count;
924 }
925
926
encode_frame(FlacEncodeContext * s)927 static int encode_frame(FlacEncodeContext *s)
928 {
929 int ch;
930 uint64_t count;
931
932 count = count_frame_header(s);
933
934 for (ch = 0; ch < s->channels; ch++)
935 count += encode_residual_ch(s, ch);
936
937 count += (8 - (count & 7)) & 7; // byte alignment
938 count += 16; // CRC-16
939
940 count >>= 3;
941 if (count > INT_MAX)
942 return AVERROR_BUG;
943 return count;
944 }
945
946
remove_wasted_bits(FlacEncodeContext * s)947 static void remove_wasted_bits(FlacEncodeContext *s)
948 {
949 int ch, i;
950
951 for (ch = 0; ch < s->channels; ch++) {
952 FlacSubframe *sub = &s->frame.subframes[ch];
953 int32_t v = 0;
954
955 for (i = 0; i < s->frame.blocksize; i++) {
956 v |= sub->samples[i];
957 if (v & 1)
958 break;
959 }
960
961 if (v && !(v & 1)) {
962 v = av_ctz(v);
963
964 for (i = 0; i < s->frame.blocksize; i++)
965 sub->samples[i] >>= v;
966
967 sub->wasted = v;
968 sub->obits -= v;
969
970 /* for 24-bit, check if removing wasted bits makes the range better
971 suited for using RICE instead of RICE2 for entropy coding */
972 if (sub->obits <= 17)
973 sub->rc.coding_mode = CODING_MODE_RICE;
974 }
975 }
976 }
977
978
estimate_stereo_mode(int32_t * left_ch,int32_t * right_ch,int n,int max_rice_param)979 static int estimate_stereo_mode(int32_t *left_ch, int32_t *right_ch, int n,
980 int max_rice_param)
981 {
982 int i, best;
983 int32_t lt, rt;
984 uint64_t sum[4];
985 uint64_t score[4];
986 int k;
987
988 /* calculate sum of 2nd order residual for each channel */
989 sum[0] = sum[1] = sum[2] = sum[3] = 0;
990 for (i = 2; i < n; i++) {
991 lt = left_ch[i] - 2*left_ch[i-1] + left_ch[i-2];
992 rt = right_ch[i] - 2*right_ch[i-1] + right_ch[i-2];
993 sum[2] += FFABS((lt + rt) >> 1);
994 sum[3] += FFABS(lt - rt);
995 sum[0] += FFABS(lt);
996 sum[1] += FFABS(rt);
997 }
998 /* estimate bit counts */
999 for (i = 0; i < 4; i++) {
1000 k = find_optimal_param(2 * sum[i], n, max_rice_param);
1001 sum[i] = rice_encode_count( 2 * sum[i], n, k);
1002 }
1003
1004 /* calculate score for each mode */
1005 score[0] = sum[0] + sum[1];
1006 score[1] = sum[0] + sum[3];
1007 score[2] = sum[1] + sum[3];
1008 score[3] = sum[2] + sum[3];
1009
1010 /* return mode with lowest score */
1011 best = 0;
1012 for (i = 1; i < 4; i++)
1013 if (score[i] < score[best])
1014 best = i;
1015
1016 return best;
1017 }
1018
1019
1020 /**
1021 * Perform stereo channel decorrelation.
1022 */
channel_decorrelation(FlacEncodeContext * s)1023 static void channel_decorrelation(FlacEncodeContext *s)
1024 {
1025 FlacFrame *frame;
1026 int32_t *left, *right;
1027 int i, n;
1028
1029 frame = &s->frame;
1030 n = frame->blocksize;
1031 left = frame->subframes[0].samples;
1032 right = frame->subframes[1].samples;
1033
1034 if (s->channels != 2) {
1035 frame->ch_mode = FLAC_CHMODE_INDEPENDENT;
1036 return;
1037 }
1038
1039 if (s->options.ch_mode < 0) {
1040 int max_rice_param = (1 << frame->subframes[0].rc.coding_mode) - 2;
1041 frame->ch_mode = estimate_stereo_mode(left, right, n, max_rice_param);
1042 } else
1043 frame->ch_mode = s->options.ch_mode;
1044
1045 /* perform decorrelation and adjust bits-per-sample */
1046 if (frame->ch_mode == FLAC_CHMODE_INDEPENDENT)
1047 return;
1048 if (frame->ch_mode == FLAC_CHMODE_MID_SIDE) {
1049 int32_t tmp;
1050 for (i = 0; i < n; i++) {
1051 tmp = left[i];
1052 left[i] = (tmp + right[i]) >> 1;
1053 right[i] = tmp - right[i];
1054 }
1055 frame->subframes[1].obits++;
1056 } else if (frame->ch_mode == FLAC_CHMODE_LEFT_SIDE) {
1057 for (i = 0; i < n; i++)
1058 right[i] = left[i] - right[i];
1059 frame->subframes[1].obits++;
1060 } else {
1061 for (i = 0; i < n; i++)
1062 left[i] -= right[i];
1063 frame->subframes[0].obits++;
1064 }
1065 }
1066
1067
write_utf8(PutBitContext * pb,uint32_t val)1068 static void write_utf8(PutBitContext *pb, uint32_t val)
1069 {
1070 uint8_t tmp;
1071 PUT_UTF8(val, tmp, put_bits(pb, 8, tmp);)
1072 }
1073
1074
write_frame_header(FlacEncodeContext * s)1075 static void write_frame_header(FlacEncodeContext *s)
1076 {
1077 FlacFrame *frame;
1078 int crc;
1079
1080 frame = &s->frame;
1081
1082 put_bits(&s->pb, 16, 0xFFF8);
1083 put_bits(&s->pb, 4, frame->bs_code[0]);
1084 put_bits(&s->pb, 4, s->sr_code[0]);
1085
1086 if (frame->ch_mode == FLAC_CHMODE_INDEPENDENT)
1087 put_bits(&s->pb, 4, s->channels-1);
1088 else
1089 put_bits(&s->pb, 4, frame->ch_mode + FLAC_MAX_CHANNELS - 1);
1090
1091 put_bits(&s->pb, 3, s->bps_code);
1092 put_bits(&s->pb, 1, 0);
1093 write_utf8(&s->pb, s->frame_count);
1094
1095 if (frame->bs_code[0] == 6)
1096 put_bits(&s->pb, 8, frame->bs_code[1]);
1097 else if (frame->bs_code[0] == 7)
1098 put_bits(&s->pb, 16, frame->bs_code[1]);
1099
1100 if (s->sr_code[0] == 12)
1101 put_bits(&s->pb, 8, s->sr_code[1]);
1102 else if (s->sr_code[0] > 12)
1103 put_bits(&s->pb, 16, s->sr_code[1]);
1104
1105 flush_put_bits(&s->pb);
1106 crc = av_crc(av_crc_get_table(AV_CRC_8_ATM), 0, s->pb.buf,
1107 put_bits_count(&s->pb) >> 3);
1108 put_bits(&s->pb, 8, crc);
1109 }
1110
1111
write_subframes(FlacEncodeContext * s)1112 static void write_subframes(FlacEncodeContext *s)
1113 {
1114 int ch;
1115
1116 for (ch = 0; ch < s->channels; ch++) {
1117 FlacSubframe *sub = &s->frame.subframes[ch];
1118 int i, p, porder, psize;
1119 int32_t *part_end;
1120 int32_t *res = sub->residual;
1121 int32_t *frame_end = &sub->residual[s->frame.blocksize];
1122
1123 /* subframe header */
1124 put_bits(&s->pb, 1, 0);
1125 put_bits(&s->pb, 6, sub->type_code);
1126 put_bits(&s->pb, 1, !!sub->wasted);
1127 if (sub->wasted)
1128 put_bits(&s->pb, sub->wasted, 1);
1129
1130 /* subframe */
1131 if (sub->type == FLAC_SUBFRAME_CONSTANT) {
1132 put_sbits(&s->pb, sub->obits, res[0]);
1133 } else if (sub->type == FLAC_SUBFRAME_VERBATIM) {
1134 while (res < frame_end)
1135 put_sbits(&s->pb, sub->obits, *res++);
1136 } else {
1137 /* warm-up samples */
1138 for (i = 0; i < sub->order; i++)
1139 put_sbits(&s->pb, sub->obits, *res++);
1140
1141 /* LPC coefficients */
1142 if (sub->type == FLAC_SUBFRAME_LPC) {
1143 int cbits = s->options.lpc_coeff_precision;
1144 put_bits( &s->pb, 4, cbits-1);
1145 put_sbits(&s->pb, 5, sub->shift);
1146 for (i = 0; i < sub->order; i++)
1147 put_sbits(&s->pb, cbits, sub->coefs[i]);
1148 }
1149
1150 /* rice-encoded block */
1151 put_bits(&s->pb, 2, sub->rc.coding_mode - 4);
1152
1153 /* partition order */
1154 porder = sub->rc.porder;
1155 psize = s->frame.blocksize >> porder;
1156 put_bits(&s->pb, 4, porder);
1157
1158 /* residual */
1159 part_end = &sub->residual[psize];
1160 for (p = 0; p < 1 << porder; p++) {
1161 int k = sub->rc.params[p];
1162 put_bits(&s->pb, sub->rc.coding_mode, k);
1163 while (res < part_end)
1164 set_sr_golomb_flac(&s->pb, *res++, k, INT32_MAX, 0);
1165 part_end = FFMIN(frame_end, part_end + psize);
1166 }
1167 }
1168 }
1169 }
1170
1171
write_frame_footer(FlacEncodeContext * s)1172 static void write_frame_footer(FlacEncodeContext *s)
1173 {
1174 int crc;
1175 flush_put_bits(&s->pb);
1176 crc = av_bswap16(av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0, s->pb.buf,
1177 put_bits_count(&s->pb)>>3));
1178 put_bits(&s->pb, 16, crc);
1179 flush_put_bits(&s->pb);
1180 }
1181
1182
write_frame(FlacEncodeContext * s,AVPacket * avpkt)1183 static int write_frame(FlacEncodeContext *s, AVPacket *avpkt)
1184 {
1185 init_put_bits(&s->pb, avpkt->data, avpkt->size);
1186 write_frame_header(s);
1187 write_subframes(s);
1188 write_frame_footer(s);
1189 return put_bits_count(&s->pb) >> 3;
1190 }
1191
1192
update_md5_sum(FlacEncodeContext * s,const void * samples)1193 static int update_md5_sum(FlacEncodeContext *s, const void *samples)
1194 {
1195 const uint8_t *buf;
1196 int buf_size = s->frame.blocksize * s->channels *
1197 ((s->avctx->bits_per_raw_sample + 7) / 8);
1198
1199 if (s->avctx->bits_per_raw_sample > 16 || HAVE_BIGENDIAN) {
1200 av_fast_malloc(&s->md5_buffer, &s->md5_buffer_size, buf_size);
1201 if (!s->md5_buffer)
1202 return AVERROR(ENOMEM);
1203 }
1204
1205 if (s->avctx->bits_per_raw_sample <= 16) {
1206 buf = (const uint8_t *)samples;
1207 #if HAVE_BIGENDIAN
1208 s->bdsp.bswap16_buf((uint16_t *) s->md5_buffer,
1209 (const uint16_t *) samples, buf_size / 2);
1210 buf = s->md5_buffer;
1211 #endif
1212 } else {
1213 int i;
1214 const int32_t *samples0 = samples;
1215 uint8_t *tmp = s->md5_buffer;
1216
1217 for (i = 0; i < s->frame.blocksize * s->channels; i++) {
1218 int32_t v = samples0[i] >> 8;
1219 *tmp++ = (v ) & 0xFF;
1220 *tmp++ = (v >> 8) & 0xFF;
1221 *tmp++ = (v >> 16) & 0xFF;
1222 }
1223 buf = s->md5_buffer;
1224 }
1225 av_md5_update(s->md5ctx, buf, buf_size);
1226
1227 return 0;
1228 }
1229
1230
flac_encode_frame(AVCodecContext * avctx,AVPacket * avpkt,const AVFrame * frame,int * got_packet_ptr)1231 static int flac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
1232 const AVFrame *frame, int *got_packet_ptr)
1233 {
1234 FlacEncodeContext *s;
1235 int frame_bytes, out_bytes, ret;
1236
1237 s = avctx->priv_data;
1238
1239 /* when the last block is reached, update the header in extradata */
1240 if (!frame) {
1241 s->max_framesize = s->max_encoded_framesize;
1242 av_md5_final(s->md5ctx, s->md5sum);
1243 write_streaminfo(s, avctx->extradata);
1244
1245 if (avctx->side_data_only_packets && !s->flushed) {
1246 uint8_t *side_data = av_packet_new_side_data(avpkt, AV_PKT_DATA_NEW_EXTRADATA,
1247 avctx->extradata_size);
1248 if (!side_data)
1249 return AVERROR(ENOMEM);
1250 memcpy(side_data, avctx->extradata, avctx->extradata_size);
1251
1252 avpkt->pts = s->next_pts;
1253
1254 *got_packet_ptr = 1;
1255 s->flushed = 1;
1256 }
1257
1258 return 0;
1259 }
1260
1261 /* change max_framesize for small final frame */
1262 if (frame->nb_samples < s->frame.blocksize) {
1263 s->max_framesize = ff_flac_get_max_frame_size(frame->nb_samples,
1264 s->channels,
1265 avctx->bits_per_raw_sample);
1266 }
1267
1268 init_frame(s, frame->nb_samples);
1269
1270 copy_samples(s, frame->data[0]);
1271
1272 channel_decorrelation(s);
1273
1274 remove_wasted_bits(s);
1275
1276 frame_bytes = encode_frame(s);
1277
1278 /* Fall back on verbatim mode if the compressed frame is larger than it
1279 would be if encoded uncompressed. */
1280 if (frame_bytes < 0 || frame_bytes > s->max_framesize) {
1281 s->frame.verbatim_only = 1;
1282 frame_bytes = encode_frame(s);
1283 if (frame_bytes < 0) {
1284 av_log(avctx, AV_LOG_ERROR, "Bad frame count\n");
1285 return frame_bytes;
1286 }
1287 }
1288
1289 if ((ret = ff_alloc_packet2(avctx, avpkt, frame_bytes)) < 0)
1290 return ret;
1291
1292 out_bytes = write_frame(s, avpkt);
1293
1294 s->frame_count++;
1295 s->sample_count += frame->nb_samples;
1296 if ((ret = update_md5_sum(s, frame->data[0])) < 0) {
1297 av_log(avctx, AV_LOG_ERROR, "Error updating MD5 checksum\n");
1298 return ret;
1299 }
1300 if (out_bytes > s->max_encoded_framesize)
1301 s->max_encoded_framesize = out_bytes;
1302 if (out_bytes < s->min_framesize)
1303 s->min_framesize = out_bytes;
1304
1305 avpkt->pts = frame->pts;
1306 avpkt->duration = ff_samples_to_time_base(avctx, frame->nb_samples);
1307 avpkt->size = out_bytes;
1308
1309 s->next_pts = avpkt->pts + avpkt->duration;
1310
1311 *got_packet_ptr = 1;
1312 return 0;
1313 }
1314
1315
flac_encode_close(AVCodecContext * avctx)1316 static av_cold int flac_encode_close(AVCodecContext *avctx)
1317 {
1318 if (avctx->priv_data) {
1319 FlacEncodeContext *s = avctx->priv_data;
1320 av_freep(&s->md5ctx);
1321 av_freep(&s->md5_buffer);
1322 ff_lpc_end(&s->lpc_ctx);
1323 }
1324 av_freep(&avctx->extradata);
1325 avctx->extradata_size = 0;
1326 return 0;
1327 }
1328
1329 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM
1330 static const AVOption options[] = {
1331 { "lpc_coeff_precision", "LPC coefficient precision", offsetof(FlacEncodeContext, options.lpc_coeff_precision), AV_OPT_TYPE_INT, {.i64 = 15 }, 0, MAX_LPC_PRECISION, FLAGS },
1332 { "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" },
1333 { "none", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_NONE }, INT_MIN, INT_MAX, FLAGS, "lpc_type" },
1334 { "fixed", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_FIXED }, INT_MIN, INT_MAX, FLAGS, "lpc_type" },
1335 { "levinson", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_LEVINSON }, INT_MIN, INT_MAX, FLAGS, "lpc_type" },
1336 { "cholesky", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_CHOLESKY }, INT_MIN, INT_MAX, FLAGS, "lpc_type" },
1337 { "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 },
1338 { "min_partition_order", NULL, offsetof(FlacEncodeContext, options.min_partition_order), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, MAX_PARTITION_ORDER, FLAGS },
1339 { "max_partition_order", NULL, offsetof(FlacEncodeContext, options.max_partition_order), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, MAX_PARTITION_ORDER, FLAGS },
1340 { "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" },
1341 { "estimation", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_EST }, INT_MIN, INT_MAX, FLAGS, "predm" },
1342 { "2level", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_2LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" },
1343 { "4level", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_4LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" },
1344 { "8level", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_8LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" },
1345 { "search", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_SEARCH }, INT_MIN, INT_MAX, FLAGS, "predm" },
1346 { "log", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_LOG }, INT_MIN, INT_MAX, FLAGS, "predm" },
1347 { "ch_mode", "Stereo decorrelation mode", offsetof(FlacEncodeContext, options.ch_mode), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, FLAC_CHMODE_MID_SIDE, FLAGS, "ch_mode" },
1348 { "auto", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = -1 }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
1349 { "indep", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_INDEPENDENT }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
1350 { "left_side", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_LEFT_SIDE }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
1351 { "right_side", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_RIGHT_SIDE }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
1352 { "mid_side", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_MID_SIDE }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
1353 { NULL },
1354 };
1355
1356 static const AVClass flac_encoder_class = {
1357 "FLAC encoder",
1358 av_default_item_name,
1359 options,
1360 LIBAVUTIL_VERSION_INT,
1361 };
1362
1363 AVCodec ff_flac_encoder = {
1364 .name = "flac",
1365 .long_name = NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"),
1366 .type = AVMEDIA_TYPE_AUDIO,
1367 .id = AV_CODEC_ID_FLAC,
1368 .priv_data_size = sizeof(FlacEncodeContext),
1369 .init = flac_encode_init,
1370 .encode2 = flac_encode_frame,
1371 .close = flac_encode_close,
1372 .capabilities = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY | CODEC_CAP_LOSSLESS,
1373 .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
1374 AV_SAMPLE_FMT_S32,
1375 AV_SAMPLE_FMT_NONE },
1376 .priv_class = &flac_encoder_class,
1377 };
1378