1699312c8cca4effea5b64f77755a8e0d30e30f5
[libav.git] / libavcodec / flacenc.c
1 /*
2 * FLAC audio encoder
3 * Copyright (c) 2006 Justin Ruggles <justin.ruggles@gmail.com>
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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/crc.h"
23 #include "libavutil/intmath.h"
24 #include "libavutil/md5.h"
25 #include "libavutil/opt.h"
26 #include "avcodec.h"
27 #include "dsputil.h"
28 #include "get_bits.h"
29 #include "golomb.h"
30 #include "internal.h"
31 #include "lpc.h"
32 #include "flac.h"
33 #include "flacdata.h"
34 #include "flacdsp.h"
35
36 #define FLAC_SUBFRAME_CONSTANT 0
37 #define FLAC_SUBFRAME_VERBATIM 1
38 #define FLAC_SUBFRAME_FIXED 8
39 #define FLAC_SUBFRAME_LPC 32
40
41 #define MAX_FIXED_ORDER 4
42 #define MAX_PARTITION_ORDER 8
43 #define MAX_PARTITIONS (1 << MAX_PARTITION_ORDER)
44 #define MAX_LPC_PRECISION 15
45 #define MAX_LPC_SHIFT 15
46
47 enum CodingMode {
48 CODING_MODE_RICE = 4,
49 CODING_MODE_RICE2 = 5,
50 };
51
52 typedef struct CompressionOptions {
53 int compression_level;
54 int block_time_ms;
55 enum FFLPCType lpc_type;
56 int lpc_passes;
57 int lpc_coeff_precision;
58 int min_prediction_order;
59 int max_prediction_order;
60 int prediction_order_method;
61 int min_partition_order;
62 int max_partition_order;
63 int ch_mode;
64 } CompressionOptions;
65
66 typedef struct RiceContext {
67 enum CodingMode coding_mode;
68 int porder;
69 int params[MAX_PARTITIONS];
70 } RiceContext;
71
72 typedef struct FlacSubframe {
73 int type;
74 int type_code;
75 int obits;
76 int wasted;
77 int order;
78 int32_t coefs[MAX_LPC_ORDER];
79 int shift;
80 RiceContext rc;
81 int32_t samples[FLAC_MAX_BLOCKSIZE];
82 int32_t residual[FLAC_MAX_BLOCKSIZE+1];
83 } FlacSubframe;
84
85 typedef struct FlacFrame {
86 FlacSubframe subframes[FLAC_MAX_CHANNELS];
87 int blocksize;
88 int bs_code[2];
89 uint8_t crc8;
90 int ch_mode;
91 int verbatim_only;
92 } FlacFrame;
93
94 typedef struct FlacEncodeContext {
95 AVClass *class;
96 PutBitContext pb;
97 int channels;
98 int samplerate;
99 int sr_code[2];
100 int bps_code;
101 int max_blocksize;
102 int min_framesize;
103 int max_framesize;
104 int max_encoded_framesize;
105 uint32_t frame_count;
106 uint64_t sample_count;
107 uint8_t md5sum[16];
108 FlacFrame frame;
109 CompressionOptions options;
110 AVCodecContext *avctx;
111 LPCContext lpc_ctx;
112 struct AVMD5 *md5ctx;
113 uint8_t *md5_buffer;
114 unsigned int md5_buffer_size;
115 DSPContext dsp;
116 FLACDSPContext flac_dsp;
117 } FlacEncodeContext;
118
119
120 /**
121 * Write streaminfo metadata block to byte array.
122 */
123 static void write_streaminfo(FlacEncodeContext *s, uint8_t *header)
124 {
125 PutBitContext pb;
126
127 memset(header, 0, FLAC_STREAMINFO_SIZE);
128 init_put_bits(&pb, header, FLAC_STREAMINFO_SIZE);
129
130 /* streaminfo metadata block */
131 put_bits(&pb, 16, s->max_blocksize);
132 put_bits(&pb, 16, s->max_blocksize);
133 put_bits(&pb, 24, s->min_framesize);
134 put_bits(&pb, 24, s->max_framesize);
135 put_bits(&pb, 20, s->samplerate);
136 put_bits(&pb, 3, s->channels-1);
137 put_bits(&pb, 5, s->avctx->bits_per_raw_sample - 1);
138 /* write 36-bit sample count in 2 put_bits() calls */
139 put_bits(&pb, 24, (s->sample_count & 0xFFFFFF000LL) >> 12);
140 put_bits(&pb, 12, s->sample_count & 0x000000FFFLL);
141 flush_put_bits(&pb);
142 memcpy(&header[18], s->md5sum, 16);
143 }
144
145
146 /**
147 * Set blocksize based on samplerate.
148 * Choose the closest predefined blocksize >= BLOCK_TIME_MS milliseconds.
149 */
150 static int select_blocksize(int samplerate, int block_time_ms)
151 {
152 int i;
153 int target;
154 int blocksize;
155
156 assert(samplerate > 0);
157 blocksize = ff_flac_blocksize_table[1];
158 target = (samplerate * block_time_ms) / 1000;
159 for (i = 0; i < 16; i++) {
160 if (target >= ff_flac_blocksize_table[i] &&
161 ff_flac_blocksize_table[i] > blocksize) {
162 blocksize = ff_flac_blocksize_table[i];
163 }
164 }
165 return blocksize;
166 }
167
168
169 static av_cold void dprint_compression_options(FlacEncodeContext *s)
170 {
171 AVCodecContext *avctx = s->avctx;
172 CompressionOptions *opt = &s->options;
173
174 av_log(avctx, AV_LOG_DEBUG, " compression: %d\n", opt->compression_level);
175
176 switch (opt->lpc_type) {
177 case FF_LPC_TYPE_NONE:
178 av_log(avctx, AV_LOG_DEBUG, " lpc type: None\n");
179 break;
180 case FF_LPC_TYPE_FIXED:
181 av_log(avctx, AV_LOG_DEBUG, " lpc type: Fixed pre-defined coefficients\n");
182 break;
183 case FF_LPC_TYPE_LEVINSON:
184 av_log(avctx, AV_LOG_DEBUG, " lpc type: Levinson-Durbin recursion with Welch window\n");
185 break;
186 case FF_LPC_TYPE_CHOLESKY:
187 av_log(avctx, AV_LOG_DEBUG, " lpc type: Cholesky factorization, %d pass%s\n",
188 opt->lpc_passes, opt->lpc_passes == 1 ? "" : "es");
189 break;
190 }
191
192 av_log(avctx, AV_LOG_DEBUG, " prediction order: %d, %d\n",
193 opt->min_prediction_order, opt->max_prediction_order);
194
195 switch (opt->prediction_order_method) {
196 case ORDER_METHOD_EST:
197 av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "estimate");
198 break;
199 case ORDER_METHOD_2LEVEL:
200 av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "2-level");
201 break;
202 case ORDER_METHOD_4LEVEL:
203 av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "4-level");
204 break;
205 case ORDER_METHOD_8LEVEL:
206 av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "8-level");
207 break;
208 case ORDER_METHOD_SEARCH:
209 av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "full search");
210 break;
211 case ORDER_METHOD_LOG:
212 av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "log search");
213 break;
214 }
215
216
217 av_log(avctx, AV_LOG_DEBUG, " partition order: %d, %d\n",
218 opt->min_partition_order, opt->max_partition_order);
219
220 av_log(avctx, AV_LOG_DEBUG, " block size: %d\n", avctx->frame_size);
221
222 av_log(avctx, AV_LOG_DEBUG, " lpc precision: %d\n",
223 opt->lpc_coeff_precision);
224 }
225
226
227 static av_cold int flac_encode_init(AVCodecContext *avctx)
228 {
229 int freq = avctx->sample_rate;
230 int channels = avctx->channels;
231 FlacEncodeContext *s = avctx->priv_data;
232 int i, level, ret;
233 uint8_t *streaminfo;
234
235 s->avctx = avctx;
236
237 switch (avctx->sample_fmt) {
238 case AV_SAMPLE_FMT_S16:
239 avctx->bits_per_raw_sample = 16;
240 s->bps_code = 4;
241 break;
242 case AV_SAMPLE_FMT_S32:
243 if (avctx->bits_per_raw_sample != 24)
244 av_log(avctx, AV_LOG_WARNING, "encoding as 24 bits-per-sample\n");
245 avctx->bits_per_raw_sample = 24;
246 s->bps_code = 6;
247 break;
248 }
249
250 if (channels < 1 || channels > FLAC_MAX_CHANNELS)
251 return -1;
252 s->channels = channels;
253
254 /* find samplerate in table */
255 if (freq < 1)
256 return -1;
257 for (i = 4; i < 12; i++) {
258 if (freq == ff_flac_sample_rate_table[i]) {
259 s->samplerate = ff_flac_sample_rate_table[i];
260 s->sr_code[0] = i;
261 s->sr_code[1] = 0;
262 break;
263 }
264 }
265 /* if not in table, samplerate is non-standard */
266 if (i == 12) {
267 if (freq % 1000 == 0 && freq < 255000) {
268 s->sr_code[0] = 12;
269 s->sr_code[1] = freq / 1000;
270 } else if (freq % 10 == 0 && freq < 655350) {
271 s->sr_code[0] = 14;
272 s->sr_code[1] = freq / 10;
273 } else if (freq < 65535) {
274 s->sr_code[0] = 13;
275 s->sr_code[1] = freq;
276 } else {
277 return -1;
278 }
279 s->samplerate = freq;
280 }
281
282 /* set compression option defaults based on avctx->compression_level */
283 if (avctx->compression_level < 0)
284 s->options.compression_level = 5;
285 else
286 s->options.compression_level = avctx->compression_level;
287
288 level = s->options.compression_level;
289 if (level > 12) {
290 av_log(avctx, AV_LOG_ERROR, "invalid compression level: %d\n",
291 s->options.compression_level);
292 return -1;
293 }
294
295 s->options.block_time_ms = ((int[]){ 27, 27, 27,105,105,105,105,105,105,105,105,105,105})[level];
296
297 if (s->options.lpc_type == FF_LPC_TYPE_DEFAULT)
298 s->options.lpc_type = ((int[]){ FF_LPC_TYPE_FIXED, FF_LPC_TYPE_FIXED, FF_LPC_TYPE_FIXED,
299 FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON,
300 FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON,
301 FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON,
302 FF_LPC_TYPE_LEVINSON})[level];
303
304 s->options.min_prediction_order = ((int[]){ 2, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1})[level];
305 s->options.max_prediction_order = ((int[]){ 3, 4, 4, 6, 8, 8, 8, 8, 12, 12, 12, 32, 32})[level];
306
307 if (s->options.prediction_order_method < 0)
308 s->options.prediction_order_method = ((int[]){ ORDER_METHOD_EST, ORDER_METHOD_EST, ORDER_METHOD_EST,
309 ORDER_METHOD_EST, ORDER_METHOD_EST, ORDER_METHOD_EST,
310 ORDER_METHOD_4LEVEL, ORDER_METHOD_LOG, ORDER_METHOD_4LEVEL,
311 ORDER_METHOD_LOG, ORDER_METHOD_SEARCH, ORDER_METHOD_LOG,
312 ORDER_METHOD_SEARCH})[level];
313
314 if (s->options.min_partition_order > s->options.max_partition_order) {
315 av_log(avctx, AV_LOG_ERROR, "invalid partition orders: min=%d max=%d\n",
316 s->options.min_partition_order, s->options.max_partition_order);
317 return AVERROR(EINVAL);
318 }
319 if (s->options.min_partition_order < 0)
320 s->options.min_partition_order = ((int[]){ 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0})[level];
321 if (s->options.max_partition_order < 0)
322 s->options.max_partition_order = ((int[]){ 2, 2, 3, 3, 3, 8, 8, 8, 8, 8, 8, 8, 8})[level];
323
324 if (s->options.lpc_type == FF_LPC_TYPE_NONE) {
325 s->options.min_prediction_order = 0;
326 } else if (avctx->min_prediction_order >= 0) {
327 if (s->options.lpc_type == FF_LPC_TYPE_FIXED) {
328 if (avctx->min_prediction_order > MAX_FIXED_ORDER) {
329 av_log(avctx, AV_LOG_ERROR, "invalid min prediction order: %d\n",
330 avctx->min_prediction_order);
331 return -1;
332 }
333 } else if (avctx->min_prediction_order < MIN_LPC_ORDER ||
334 avctx->min_prediction_order > MAX_LPC_ORDER) {
335 av_log(avctx, AV_LOG_ERROR, "invalid min prediction order: %d\n",
336 avctx->min_prediction_order);
337 return -1;
338 }
339 s->options.min_prediction_order = avctx->min_prediction_order;
340 }
341 if (s->options.lpc_type == FF_LPC_TYPE_NONE) {
342 s->options.max_prediction_order = 0;
343 } else if (avctx->max_prediction_order >= 0) {
344 if (s->options.lpc_type == FF_LPC_TYPE_FIXED) {
345 if (avctx->max_prediction_order > MAX_FIXED_ORDER) {
346 av_log(avctx, AV_LOG_ERROR, "invalid max prediction order: %d\n",
347 avctx->max_prediction_order);
348 return -1;
349 }
350 } else if (avctx->max_prediction_order < MIN_LPC_ORDER ||
351 avctx->max_prediction_order > MAX_LPC_ORDER) {
352 av_log(avctx, AV_LOG_ERROR, "invalid max prediction order: %d\n",
353 avctx->max_prediction_order);
354 return -1;
355 }
356 s->options.max_prediction_order = avctx->max_prediction_order;
357 }
358 if (s->options.max_prediction_order < s->options.min_prediction_order) {
359 av_log(avctx, AV_LOG_ERROR, "invalid prediction orders: min=%d max=%d\n",
360 s->options.min_prediction_order, s->options.max_prediction_order);
361 return -1;
362 }
363
364 if (avctx->frame_size > 0) {
365 if (avctx->frame_size < FLAC_MIN_BLOCKSIZE ||
366 avctx->frame_size > FLAC_MAX_BLOCKSIZE) {
367 av_log(avctx, AV_LOG_ERROR, "invalid block size: %d\n",
368 avctx->frame_size);
369 return -1;
370 }
371 } else {
372 s->avctx->frame_size = select_blocksize(s->samplerate, s->options.block_time_ms);
373 }
374 s->max_blocksize = s->avctx->frame_size;
375
376 /* set maximum encoded frame size in verbatim mode */
377 s->max_framesize = ff_flac_get_max_frame_size(s->avctx->frame_size,
378 s->channels,
379 s->avctx->bits_per_raw_sample);
380
381 /* initialize MD5 context */
382 s->md5ctx = av_md5_alloc();
383 if (!s->md5ctx)
384 return AVERROR(ENOMEM);
385 av_md5_init(s->md5ctx);
386
387 streaminfo = av_malloc(FLAC_STREAMINFO_SIZE);
388 if (!streaminfo)
389 return AVERROR(ENOMEM);
390 write_streaminfo(s, streaminfo);
391 avctx->extradata = streaminfo;
392 avctx->extradata_size = FLAC_STREAMINFO_SIZE;
393
394 s->frame_count = 0;
395 s->min_framesize = s->max_framesize;
396
397 ret = ff_lpc_init(&s->lpc_ctx, avctx->frame_size,
398 s->options.max_prediction_order, FF_LPC_TYPE_LEVINSON);
399
400 ff_dsputil_init(&s->dsp, avctx);
401 ff_flacdsp_init(&s->flac_dsp, avctx->sample_fmt,
402 avctx->bits_per_raw_sample);
403
404 dprint_compression_options(s);
405
406 return ret;
407 }
408
409
410 static void init_frame(FlacEncodeContext *s, int nb_samples)
411 {
412 int i, ch;
413 FlacFrame *frame;
414
415 frame = &s->frame;
416
417 for (i = 0; i < 16; i++) {
418 if (nb_samples == ff_flac_blocksize_table[i]) {
419 frame->blocksize = ff_flac_blocksize_table[i];
420 frame->bs_code[0] = i;
421 frame->bs_code[1] = 0;
422 break;
423 }
424 }
425 if (i == 16) {
426 frame->blocksize = nb_samples;
427 if (frame->blocksize <= 256) {
428 frame->bs_code[0] = 6;
429 frame->bs_code[1] = frame->blocksize-1;
430 } else {
431 frame->bs_code[0] = 7;
432 frame->bs_code[1] = frame->blocksize-1;
433 }
434 }
435
436 for (ch = 0; ch < s->channels; ch++) {
437 FlacSubframe *sub = &frame->subframes[ch];
438
439 sub->wasted = 0;
440 sub->obits = s->avctx->bits_per_raw_sample;
441
442 if (sub->obits > 16)
443 sub->rc.coding_mode = CODING_MODE_RICE2;
444 else
445 sub->rc.coding_mode = CODING_MODE_RICE;
446 }
447
448 frame->verbatim_only = 0;
449 }
450
451
452 /**
453 * Copy channel-interleaved input samples into separate subframes.
454 */
455 static void copy_samples(FlacEncodeContext *s, const void *samples)
456 {
457 int i, j, ch;
458 FlacFrame *frame;
459 int shift = av_get_bytes_per_sample(s->avctx->sample_fmt) * 8 -
460 s->avctx->bits_per_raw_sample;
461
462 #define COPY_SAMPLES(bits) do { \
463 const int ## bits ## _t *samples0 = samples; \
464 frame = &s->frame; \
465 for (i = 0, j = 0; i < frame->blocksize; i++) \
466 for (ch = 0; ch < s->channels; ch++, j++) \
467 frame->subframes[ch].samples[i] = samples0[j] >> shift; \
468 } while (0)
469
470 if (s->avctx->sample_fmt == AV_SAMPLE_FMT_S16)
471 COPY_SAMPLES(16);
472 else
473 COPY_SAMPLES(32);
474 }
475
476
477 static uint64_t rice_count_exact(int32_t *res, int n, int k)
478 {
479 int i;
480 uint64_t count = 0;
481
482 for (i = 0; i < n; i++) {
483 int32_t v = -2 * res[i] - 1;
484 v ^= v >> 31;
485 count += (v >> k) + 1 + k;
486 }
487 return count;
488 }
489
490
491 static uint64_t subframe_count_exact(FlacEncodeContext *s, FlacSubframe *sub,
492 int pred_order)
493 {
494 int p, porder, psize;
495 int i, part_end;
496 uint64_t count = 0;
497
498 /* subframe header */
499 count += 8;
500
501 /* subframe */
502 if (sub->type == FLAC_SUBFRAME_CONSTANT) {
503 count += sub->obits;
504 } else if (sub->type == FLAC_SUBFRAME_VERBATIM) {
505 count += s->frame.blocksize * sub->obits;
506 } else {
507 /* warm-up samples */
508 count += pred_order * sub->obits;
509
510 /* LPC coefficients */
511 if (sub->type == FLAC_SUBFRAME_LPC)
512 count += 4 + 5 + pred_order * s->options.lpc_coeff_precision;
513
514 /* rice-encoded block */
515 count += 2;
516
517 /* partition order */
518 porder = sub->rc.porder;
519 psize = s->frame.blocksize >> porder;
520 count += 4;
521
522 /* residual */
523 i = pred_order;
524 part_end = psize;
525 for (p = 0; p < 1 << porder; p++) {
526 int k = sub->rc.params[p];
527 count += sub->rc.coding_mode;
528 count += rice_count_exact(&sub->residual[i], part_end - i, k);
529 i = part_end;
530 part_end = FFMIN(s->frame.blocksize, part_end + psize);
531 }
532 }
533
534 return count;
535 }
536
537
538 #define rice_encode_count(sum, n, k) (((n)*((k)+1))+((sum-(n>>1))>>(k)))
539
540 /**
541 * Solve for d/dk(rice_encode_count) = n-((sum-(n>>1))>>(k+1)) = 0.
542 */
543 static int find_optimal_param(uint64_t sum, int n, int max_param)
544 {
545 int k;
546 uint64_t sum2;
547
548 if (sum <= n >> 1)
549 return 0;
550 sum2 = sum - (n >> 1);
551 k = av_log2(av_clipl_int32(sum2 / n));
552 return FFMIN(k, max_param);
553 }
554
555
556 static uint64_t calc_optimal_rice_params(RiceContext *rc, int porder,
557 uint64_t *sums, int n, int pred_order)
558 {
559 int i;
560 int k, cnt, part, max_param;
561 uint64_t all_bits;
562
563 max_param = (1 << rc->coding_mode) - 2;
564
565 part = (1 << porder);
566 all_bits = 4 * part;
567
568 cnt = (n >> porder) - pred_order;
569 for (i = 0; i < part; i++) {
570 k = find_optimal_param(sums[i], cnt, max_param);
571 rc->params[i] = k;
572 all_bits += rice_encode_count(sums[i], cnt, k);
573 cnt = n >> porder;
574 }
575
576 rc->porder = porder;
577
578 return all_bits;
579 }
580
581
582 static void calc_sums(int pmin, int pmax, uint32_t *data, int n, int pred_order,
583 uint64_t sums[][MAX_PARTITIONS])
584 {
585 int i, j;
586 int parts;
587 uint32_t *res, *res_end;
588
589 /* sums for highest level */
590 parts = (1 << pmax);
591 res = &data[pred_order];
592 res_end = &data[n >> pmax];
593 for (i = 0; i < parts; i++) {
594 uint64_t sum = 0;
595 while (res < res_end)
596 sum += *(res++);
597 sums[pmax][i] = sum;
598 res_end += n >> pmax;
599 }
600 /* sums for lower levels */
601 for (i = pmax - 1; i >= pmin; i--) {
602 parts = (1 << i);
603 for (j = 0; j < parts; j++)
604 sums[i][j] = sums[i+1][2*j] + sums[i+1][2*j+1];
605 }
606 }
607
608
609 static uint64_t calc_rice_params(RiceContext *rc, int pmin, int pmax,
610 int32_t *data, int n, int pred_order)
611 {
612 int i;
613 uint64_t bits[MAX_PARTITION_ORDER+1];
614 int opt_porder;
615 RiceContext tmp_rc;
616 uint32_t *udata;
617 uint64_t sums[MAX_PARTITION_ORDER+1][MAX_PARTITIONS];
618
619 assert(pmin >= 0 && pmin <= MAX_PARTITION_ORDER);
620 assert(pmax >= 0 && pmax <= MAX_PARTITION_ORDER);
621 assert(pmin <= pmax);
622
623 tmp_rc.coding_mode = rc->coding_mode;
624
625 udata = av_malloc(n * sizeof(uint32_t));
626 for (i = 0; i < n; i++)
627 udata[i] = (2*data[i]) ^ (data[i]>>31);
628
629 calc_sums(pmin, pmax, udata, n, pred_order, sums);
630
631 opt_porder = pmin;
632 bits[pmin] = UINT32_MAX;
633 for (i = pmin; i <= pmax; i++) {
634 bits[i] = calc_optimal_rice_params(&tmp_rc, i, sums[i], n, pred_order);
635 if (bits[i] <= bits[opt_porder]) {
636 opt_porder = i;
637 *rc = tmp_rc;
638 }
639 }
640
641 av_freep(&udata);
642 return bits[opt_porder];
643 }
644
645
646 static int get_max_p_order(int max_porder, int n, int order)
647 {
648 int porder = FFMIN(max_porder, av_log2(n^(n-1)));
649 if (order > 0)
650 porder = FFMIN(porder, av_log2(n/order));
651 return porder;
652 }
653
654
655 static uint64_t find_subframe_rice_params(FlacEncodeContext *s,
656 FlacSubframe *sub, int pred_order)
657 {
658 int pmin = get_max_p_order(s->options.min_partition_order,
659 s->frame.blocksize, pred_order);
660 int pmax = get_max_p_order(s->options.max_partition_order,
661 s->frame.blocksize, pred_order);
662
663 uint64_t bits = 8 + pred_order * sub->obits + 2 + sub->rc.coding_mode;
664 if (sub->type == FLAC_SUBFRAME_LPC)
665 bits += 4 + 5 + pred_order * s->options.lpc_coeff_precision;
666 bits += calc_rice_params(&sub->rc, pmin, pmax, sub->residual,
667 s->frame.blocksize, pred_order);
668 return bits;
669 }
670
671
672 static void encode_residual_fixed(int32_t *res, const int32_t *smp, int n,
673 int order)
674 {
675 int i;
676
677 for (i = 0; i < order; i++)
678 res[i] = smp[i];
679
680 if (order == 0) {
681 for (i = order; i < n; i++)
682 res[i] = smp[i];
683 } else if (order == 1) {
684 for (i = order; i < n; i++)
685 res[i] = smp[i] - smp[i-1];
686 } else if (order == 2) {
687 int a = smp[order-1] - smp[order-2];
688 for (i = order; i < n; i += 2) {
689 int b = smp[i ] - smp[i-1];
690 res[i] = b - a;
691 a = smp[i+1] - smp[i ];
692 res[i+1] = a - b;
693 }
694 } else if (order == 3) {
695 int a = smp[order-1] - smp[order-2];
696 int c = smp[order-1] - 2*smp[order-2] + smp[order-3];
697 for (i = order; i < n; i += 2) {
698 int b = smp[i ] - smp[i-1];
699 int d = b - a;
700 res[i] = d - c;
701 a = smp[i+1] - smp[i ];
702 c = a - b;
703 res[i+1] = c - d;
704 }
705 } else {
706 int a = smp[order-1] - smp[order-2];
707 int c = smp[order-1] - 2*smp[order-2] + smp[order-3];
708 int e = smp[order-1] - 3*smp[order-2] + 3*smp[order-3] - smp[order-4];
709 for (i = order; i < n; i += 2) {
710 int b = smp[i ] - smp[i-1];
711 int d = b - a;
712 int f = d - c;
713 res[i ] = f - e;
714 a = smp[i+1] - smp[i ];
715 c = a - b;
716 e = c - d;
717 res[i+1] = e - f;
718 }
719 }
720 }
721
722
723 static int encode_residual_ch(FlacEncodeContext *s, int ch)
724 {
725 int i, n;
726 int min_order, max_order, opt_order, omethod;
727 FlacFrame *frame;
728 FlacSubframe *sub;
729 int32_t coefs[MAX_LPC_ORDER][MAX_LPC_ORDER];
730 int shift[MAX_LPC_ORDER];
731 int32_t *res, *smp;
732
733 frame = &s->frame;
734 sub = &frame->subframes[ch];
735 res = sub->residual;
736 smp = sub->samples;
737 n = frame->blocksize;
738
739 /* CONSTANT */
740 for (i = 1; i < n; i++)
741 if(smp[i] != smp[0])
742 break;
743 if (i == n) {
744 sub->type = sub->type_code = FLAC_SUBFRAME_CONSTANT;
745 res[0] = smp[0];
746 return subframe_count_exact(s, sub, 0);
747 }
748
749 /* VERBATIM */
750 if (frame->verbatim_only || n < 5) {
751 sub->type = sub->type_code = FLAC_SUBFRAME_VERBATIM;
752 memcpy(res, smp, n * sizeof(int32_t));
753 return subframe_count_exact(s, sub, 0);
754 }
755
756 min_order = s->options.min_prediction_order;
757 max_order = s->options.max_prediction_order;
758 omethod = s->options.prediction_order_method;
759
760 /* FIXED */
761 sub->type = FLAC_SUBFRAME_FIXED;
762 if (s->options.lpc_type == FF_LPC_TYPE_NONE ||
763 s->options.lpc_type == FF_LPC_TYPE_FIXED || n <= max_order) {
764 uint64_t bits[MAX_FIXED_ORDER+1];
765 if (max_order > MAX_FIXED_ORDER)
766 max_order = MAX_FIXED_ORDER;
767 opt_order = 0;
768 bits[0] = UINT32_MAX;
769 for (i = min_order; i <= max_order; i++) {
770 encode_residual_fixed(res, smp, n, i);
771 bits[i] = find_subframe_rice_params(s, sub, i);
772 if (bits[i] < bits[opt_order])
773 opt_order = i;
774 }
775 sub->order = opt_order;
776 sub->type_code = sub->type | sub->order;
777 if (sub->order != max_order) {
778 encode_residual_fixed(res, smp, n, sub->order);
779 find_subframe_rice_params(s, sub, sub->order);
780 }
781 return subframe_count_exact(s, sub, sub->order);
782 }
783
784 /* LPC */
785 sub->type = FLAC_SUBFRAME_LPC;
786 opt_order = ff_lpc_calc_coefs(&s->lpc_ctx, smp, n, min_order, max_order,
787 s->options.lpc_coeff_precision, coefs, shift, s->options.lpc_type,
788 s->options.lpc_passes, omethod,
789 MAX_LPC_SHIFT, 0);
790
791 if (omethod == ORDER_METHOD_2LEVEL ||
792 omethod == ORDER_METHOD_4LEVEL ||
793 omethod == ORDER_METHOD_8LEVEL) {
794 int levels = 1 << omethod;
795 uint64_t bits[1 << ORDER_METHOD_8LEVEL];
796 int order = -1;
797 int opt_index = levels-1;
798 opt_order = max_order-1;
799 bits[opt_index] = UINT32_MAX;
800 for (i = levels-1; i >= 0; i--) {
801 int last_order = order;
802 order = min_order + (((max_order-min_order+1) * (i+1)) / levels)-1;
803 order = av_clip(order, min_order - 1, max_order - 1);
804 if (order == last_order)
805 continue;
806 s->flac_dsp.lpc_encode(res, smp, n, order+1, coefs[order],
807 shift[order]);
808 bits[i] = find_subframe_rice_params(s, sub, order+1);
809 if (bits[i] < bits[opt_index]) {
810 opt_index = i;
811 opt_order = order;
812 }
813 }
814 opt_order++;
815 } else if (omethod == ORDER_METHOD_SEARCH) {
816 // brute-force optimal order search
817 uint64_t bits[MAX_LPC_ORDER];
818 opt_order = 0;
819 bits[0] = UINT32_MAX;
820 for (i = min_order-1; i < max_order; i++) {
821 s->flac_dsp.lpc_encode(res, smp, n, i+1, coefs[i], shift[i]);
822 bits[i] = find_subframe_rice_params(s, sub, i+1);
823 if (bits[i] < bits[opt_order])
824 opt_order = i;
825 }
826 opt_order++;
827 } else if (omethod == ORDER_METHOD_LOG) {
828 uint64_t bits[MAX_LPC_ORDER];
829 int step;
830
831 opt_order = min_order - 1 + (max_order-min_order)/3;
832 memset(bits, -1, sizeof(bits));
833
834 for (step = 16; step; step >>= 1) {
835 int last = opt_order;
836 for (i = last-step; i <= last+step; i += step) {
837 if (i < min_order-1 || i >= max_order || bits[i] < UINT32_MAX)
838 continue;
839 s->flac_dsp.lpc_encode(res, smp, n, i+1, coefs[i], shift[i]);
840 bits[i] = find_subframe_rice_params(s, sub, i+1);
841 if (bits[i] < bits[opt_order])
842 opt_order = i;
843 }
844 }
845 opt_order++;
846 }
847
848 sub->order = opt_order;
849 sub->type_code = sub->type | (sub->order-1);
850 sub->shift = shift[sub->order-1];
851 for (i = 0; i < sub->order; i++)
852 sub->coefs[i] = coefs[sub->order-1][i];
853
854 s->flac_dsp.lpc_encode(res, smp, n, sub->order, sub->coefs, sub->shift);
855
856 find_subframe_rice_params(s, sub, sub->order);
857
858 return subframe_count_exact(s, sub, sub->order);
859 }
860
861
862 static int count_frame_header(FlacEncodeContext *s)
863 {
864 uint8_t av_unused tmp;
865 int count;
866
867 /*
868 <14> Sync code
869 <1> Reserved
870 <1> Blocking strategy
871 <4> Block size in inter-channel samples
872 <4> Sample rate
873 <4> Channel assignment
874 <3> Sample size in bits
875 <1> Reserved
876 */
877 count = 32;
878
879 /* coded frame number */
880 PUT_UTF8(s->frame_count, tmp, count += 8;)
881
882 /* explicit block size */
883 if (s->frame.bs_code[0] == 6)
884 count += 8;
885 else if (s->frame.bs_code[0] == 7)
886 count += 16;
887
888 /* explicit sample rate */
889 count += ((s->sr_code[0] == 12) + (s->sr_code[0] > 12)) * 8;
890
891 /* frame header CRC-8 */
892 count += 8;
893
894 return count;
895 }
896
897
898 static int encode_frame(FlacEncodeContext *s)
899 {
900 int ch;
901 uint64_t count;
902
903 count = count_frame_header(s);
904
905 for (ch = 0; ch < s->channels; ch++)
906 count += encode_residual_ch(s, ch);
907
908 count += (8 - (count & 7)) & 7; // byte alignment
909 count += 16; // CRC-16
910
911 count >>= 3;
912 if (count > INT_MAX)
913 return AVERROR_BUG;
914 return count;
915 }
916
917
918 static void remove_wasted_bits(FlacEncodeContext *s)
919 {
920 int ch, i;
921
922 for (ch = 0; ch < s->channels; ch++) {
923 FlacSubframe *sub = &s->frame.subframes[ch];
924 int32_t v = 0;
925
926 for (i = 0; i < s->frame.blocksize; i++) {
927 v |= sub->samples[i];
928 if (v & 1)
929 break;
930 }
931
932 if (v && !(v & 1)) {
933 v = av_ctz(v);
934
935 for (i = 0; i < s->frame.blocksize; i++)
936 sub->samples[i] >>= v;
937
938 sub->wasted = v;
939 sub->obits -= v;
940
941 /* for 24-bit, check if removing wasted bits makes the range better
942 suited for using RICE instead of RICE2 for entropy coding */
943 if (sub->obits <= 17)
944 sub->rc.coding_mode = CODING_MODE_RICE;
945 }
946 }
947 }
948
949
950 static int estimate_stereo_mode(int32_t *left_ch, int32_t *right_ch, int n,
951 int max_rice_param)
952 {
953 int i, best;
954 int32_t lt, rt;
955 uint64_t sum[4];
956 uint64_t score[4];
957 int k;
958
959 /* calculate sum of 2nd order residual for each channel */
960 sum[0] = sum[1] = sum[2] = sum[3] = 0;
961 for (i = 2; i < n; i++) {
962 lt = left_ch[i] - 2*left_ch[i-1] + left_ch[i-2];
963 rt = right_ch[i] - 2*right_ch[i-1] + right_ch[i-2];
964 sum[2] += FFABS((lt + rt) >> 1);
965 sum[3] += FFABS(lt - rt);
966 sum[0] += FFABS(lt);
967 sum[1] += FFABS(rt);
968 }
969 /* estimate bit counts */
970 for (i = 0; i < 4; i++) {
971 k = find_optimal_param(2 * sum[i], n, max_rice_param);
972 sum[i] = rice_encode_count( 2 * sum[i], n, k);
973 }
974
975 /* calculate score for each mode */
976 score[0] = sum[0] + sum[1];
977 score[1] = sum[0] + sum[3];
978 score[2] = sum[1] + sum[3];
979 score[3] = sum[2] + sum[3];
980
981 /* return mode with lowest score */
982 best = 0;
983 for (i = 1; i < 4; i++)
984 if (score[i] < score[best])
985 best = i;
986
987 return best;
988 }
989
990
991 /**
992 * Perform stereo channel decorrelation.
993 */
994 static void channel_decorrelation(FlacEncodeContext *s)
995 {
996 FlacFrame *frame;
997 int32_t *left, *right;
998 int i, n;
999
1000 frame = &s->frame;
1001 n = frame->blocksize;
1002 left = frame->subframes[0].samples;
1003 right = frame->subframes[1].samples;
1004
1005 if (s->channels != 2) {
1006 frame->ch_mode = FLAC_CHMODE_INDEPENDENT;
1007 return;
1008 }
1009
1010 if (s->options.ch_mode < 0) {
1011 int max_rice_param = (1 << frame->subframes[0].rc.coding_mode) - 2;
1012 frame->ch_mode = estimate_stereo_mode(left, right, n, max_rice_param);
1013 } else
1014 frame->ch_mode = s->options.ch_mode;
1015
1016 /* perform decorrelation and adjust bits-per-sample */
1017 if (frame->ch_mode == FLAC_CHMODE_INDEPENDENT)
1018 return;
1019 if (frame->ch_mode == FLAC_CHMODE_MID_SIDE) {
1020 int32_t tmp;
1021 for (i = 0; i < n; i++) {
1022 tmp = left[i];
1023 left[i] = (tmp + right[i]) >> 1;
1024 right[i] = tmp - right[i];
1025 }
1026 frame->subframes[1].obits++;
1027 } else if (frame->ch_mode == FLAC_CHMODE_LEFT_SIDE) {
1028 for (i = 0; i < n; i++)
1029 right[i] = left[i] - right[i];
1030 frame->subframes[1].obits++;
1031 } else {
1032 for (i = 0; i < n; i++)
1033 left[i] -= right[i];
1034 frame->subframes[0].obits++;
1035 }
1036 }
1037
1038
1039 static void write_utf8(PutBitContext *pb, uint32_t val)
1040 {
1041 uint8_t tmp;
1042 PUT_UTF8(val, tmp, put_bits(pb, 8, tmp);)
1043 }
1044
1045
1046 static void write_frame_header(FlacEncodeContext *s)
1047 {
1048 FlacFrame *frame;
1049 int crc;
1050
1051 frame = &s->frame;
1052
1053 put_bits(&s->pb, 16, 0xFFF8);
1054 put_bits(&s->pb, 4, frame->bs_code[0]);
1055 put_bits(&s->pb, 4, s->sr_code[0]);
1056
1057 if (frame->ch_mode == FLAC_CHMODE_INDEPENDENT)
1058 put_bits(&s->pb, 4, s->channels-1);
1059 else
1060 put_bits(&s->pb, 4, frame->ch_mode + FLAC_MAX_CHANNELS - 1);
1061
1062 put_bits(&s->pb, 3, s->bps_code);
1063 put_bits(&s->pb, 1, 0);
1064 write_utf8(&s->pb, s->frame_count);
1065
1066 if (frame->bs_code[0] == 6)
1067 put_bits(&s->pb, 8, frame->bs_code[1]);
1068 else if (frame->bs_code[0] == 7)
1069 put_bits(&s->pb, 16, frame->bs_code[1]);
1070
1071 if (s->sr_code[0] == 12)
1072 put_bits(&s->pb, 8, s->sr_code[1]);
1073 else if (s->sr_code[0] > 12)
1074 put_bits(&s->pb, 16, s->sr_code[1]);
1075
1076 flush_put_bits(&s->pb);
1077 crc = av_crc(av_crc_get_table(AV_CRC_8_ATM), 0, s->pb.buf,
1078 put_bits_count(&s->pb) >> 3);
1079 put_bits(&s->pb, 8, crc);
1080 }
1081
1082
1083 static void write_subframes(FlacEncodeContext *s)
1084 {
1085 int ch;
1086
1087 for (ch = 0; ch < s->channels; ch++) {
1088 FlacSubframe *sub = &s->frame.subframes[ch];
1089 int i, p, porder, psize;
1090 int32_t *part_end;
1091 int32_t *res = sub->residual;
1092 int32_t *frame_end = &sub->residual[s->frame.blocksize];
1093
1094 /* subframe header */
1095 put_bits(&s->pb, 1, 0);
1096 put_bits(&s->pb, 6, sub->type_code);
1097 put_bits(&s->pb, 1, !!sub->wasted);
1098 if (sub->wasted)
1099 put_bits(&s->pb, sub->wasted, 1);
1100
1101 /* subframe */
1102 if (sub->type == FLAC_SUBFRAME_CONSTANT) {
1103 put_sbits(&s->pb, sub->obits, res[0]);
1104 } else if (sub->type == FLAC_SUBFRAME_VERBATIM) {
1105 while (res < frame_end)
1106 put_sbits(&s->pb, sub->obits, *res++);
1107 } else {
1108 /* warm-up samples */
1109 for (i = 0; i < sub->order; i++)
1110 put_sbits(&s->pb, sub->obits, *res++);
1111
1112 /* LPC coefficients */
1113 if (sub->type == FLAC_SUBFRAME_LPC) {
1114 int cbits = s->options.lpc_coeff_precision;
1115 put_bits( &s->pb, 4, cbits-1);
1116 put_sbits(&s->pb, 5, sub->shift);
1117 for (i = 0; i < sub->order; i++)
1118 put_sbits(&s->pb, cbits, sub->coefs[i]);
1119 }
1120
1121 /* rice-encoded block */
1122 put_bits(&s->pb, 2, sub->rc.coding_mode - 4);
1123
1124 /* partition order */
1125 porder = sub->rc.porder;
1126 psize = s->frame.blocksize >> porder;
1127 put_bits(&s->pb, 4, porder);
1128
1129 /* residual */
1130 part_end = &sub->residual[psize];
1131 for (p = 0; p < 1 << porder; p++) {
1132 int k = sub->rc.params[p];
1133 put_bits(&s->pb, sub->rc.coding_mode, k);
1134 while (res < part_end)
1135 set_sr_golomb_flac(&s->pb, *res++, k, INT32_MAX, 0);
1136 part_end = FFMIN(frame_end, part_end + psize);
1137 }
1138 }
1139 }
1140 }
1141
1142
1143 static void write_frame_footer(FlacEncodeContext *s)
1144 {
1145 int crc;
1146 flush_put_bits(&s->pb);
1147 crc = av_bswap16(av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0, s->pb.buf,
1148 put_bits_count(&s->pb)>>3));
1149 put_bits(&s->pb, 16, crc);
1150 flush_put_bits(&s->pb);
1151 }
1152
1153
1154 static int write_frame(FlacEncodeContext *s, AVPacket *avpkt)
1155 {
1156 init_put_bits(&s->pb, avpkt->data, avpkt->size);
1157 write_frame_header(s);
1158 write_subframes(s);
1159 write_frame_footer(s);
1160 return put_bits_count(&s->pb) >> 3;
1161 }
1162
1163
1164 static int update_md5_sum(FlacEncodeContext *s, const void *samples)
1165 {
1166 const uint8_t *buf;
1167 int buf_size = s->frame.blocksize * s->channels *
1168 ((s->avctx->bits_per_raw_sample + 7) / 8);
1169
1170 if (s->avctx->bits_per_raw_sample > 16 || HAVE_BIGENDIAN) {
1171 av_fast_malloc(&s->md5_buffer, &s->md5_buffer_size, buf_size);
1172 if (!s->md5_buffer)
1173 return AVERROR(ENOMEM);
1174 }
1175
1176 if (s->avctx->bits_per_raw_sample <= 16) {
1177 buf = (const uint8_t *)samples;
1178 #if HAVE_BIGENDIAN
1179 s->dsp.bswap16_buf((uint16_t *)s->md5_buffer,
1180 (const uint16_t *)samples, buf_size / 2);
1181 buf = s->md5_buffer;
1182 #endif
1183 } else {
1184 int i;
1185 const int32_t *samples0 = samples;
1186 uint8_t *tmp = s->md5_buffer;
1187
1188 for (i = 0; i < s->frame.blocksize * s->channels; i++) {
1189 int32_t v = samples0[i] >> 8;
1190 *tmp++ = (v ) & 0xFF;
1191 *tmp++ = (v >> 8) & 0xFF;
1192 *tmp++ = (v >> 16) & 0xFF;
1193 }
1194 buf = s->md5_buffer;
1195 }
1196 av_md5_update(s->md5ctx, buf, buf_size);
1197
1198 return 0;
1199 }
1200
1201
1202 static int flac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
1203 const AVFrame *frame, int *got_packet_ptr)
1204 {
1205 FlacEncodeContext *s;
1206 int frame_bytes, out_bytes, ret;
1207
1208 s = avctx->priv_data;
1209
1210 /* when the last block is reached, update the header in extradata */
1211 if (!frame) {
1212 s->max_framesize = s->max_encoded_framesize;
1213 av_md5_final(s->md5ctx, s->md5sum);
1214 write_streaminfo(s, avctx->extradata);
1215 return 0;
1216 }
1217
1218 /* change max_framesize for small final frame */
1219 if (frame->nb_samples < s->frame.blocksize) {
1220 s->max_framesize = ff_flac_get_max_frame_size(frame->nb_samples,
1221 s->channels,
1222 avctx->bits_per_raw_sample);
1223 }
1224
1225 init_frame(s, frame->nb_samples);
1226
1227 copy_samples(s, frame->data[0]);
1228
1229 channel_decorrelation(s);
1230
1231 remove_wasted_bits(s);
1232
1233 frame_bytes = encode_frame(s);
1234
1235 /* fallback to verbatim mode if the compressed frame is larger than it
1236 would be if encoded uncompressed. */
1237 if (frame_bytes < 0 || frame_bytes > s->max_framesize) {
1238 s->frame.verbatim_only = 1;
1239 frame_bytes = encode_frame(s);
1240 if (frame_bytes < 0) {
1241 av_log(avctx, AV_LOG_ERROR, "Bad frame count\n");
1242 return frame_bytes;
1243 }
1244 }
1245
1246 if ((ret = ff_alloc_packet(avpkt, frame_bytes))) {
1247 av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n");
1248 return ret;
1249 }
1250
1251 out_bytes = write_frame(s, avpkt);
1252
1253 s->frame_count++;
1254 s->sample_count += frame->nb_samples;
1255 if ((ret = update_md5_sum(s, frame->data[0])) < 0) {
1256 av_log(avctx, AV_LOG_ERROR, "Error updating MD5 checksum\n");
1257 return ret;
1258 }
1259 if (out_bytes > s->max_encoded_framesize)
1260 s->max_encoded_framesize = out_bytes;
1261 if (out_bytes < s->min_framesize)
1262 s->min_framesize = out_bytes;
1263
1264 avpkt->pts = frame->pts;
1265 avpkt->duration = ff_samples_to_time_base(avctx, frame->nb_samples);
1266 avpkt->size = out_bytes;
1267 *got_packet_ptr = 1;
1268 return 0;
1269 }
1270
1271
1272 static av_cold int flac_encode_close(AVCodecContext *avctx)
1273 {
1274 if (avctx->priv_data) {
1275 FlacEncodeContext *s = avctx->priv_data;
1276 av_freep(&s->md5ctx);
1277 av_freep(&s->md5_buffer);
1278 ff_lpc_end(&s->lpc_ctx);
1279 }
1280 av_freep(&avctx->extradata);
1281 avctx->extradata_size = 0;
1282 return 0;
1283 }
1284
1285 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM
1286 static const AVOption options[] = {
1287 { "lpc_coeff_precision", "LPC coefficient precision", offsetof(FlacEncodeContext, options.lpc_coeff_precision), AV_OPT_TYPE_INT, {.i64 = 15 }, 0, MAX_LPC_PRECISION, FLAGS },
1288 { "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" },
1289 { "none", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_NONE }, INT_MIN, INT_MAX, FLAGS, "lpc_type" },
1290 { "fixed", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_FIXED }, INT_MIN, INT_MAX, FLAGS, "lpc_type" },
1291 { "levinson", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_LEVINSON }, INT_MIN, INT_MAX, FLAGS, "lpc_type" },
1292 { "cholesky", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_CHOLESKY }, INT_MIN, INT_MAX, FLAGS, "lpc_type" },
1293 { "lpc_passes", "Number of passes to use for Cholesky factorization during LPC analysis", offsetof(FlacEncodeContext, options.lpc_passes), AV_OPT_TYPE_INT, {.i64 = 1 }, 1, INT_MAX, FLAGS },
1294 { "min_partition_order", NULL, offsetof(FlacEncodeContext, options.min_partition_order), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, MAX_PARTITION_ORDER, FLAGS },
1295 { "max_partition_order", NULL, offsetof(FlacEncodeContext, options.max_partition_order), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, MAX_PARTITION_ORDER, FLAGS },
1296 { "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" },
1297 { "estimation", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_EST }, INT_MIN, INT_MAX, FLAGS, "predm" },
1298 { "2level", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_2LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" },
1299 { "4level", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_4LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" },
1300 { "8level", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_8LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" },
1301 { "search", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_SEARCH }, INT_MIN, INT_MAX, FLAGS, "predm" },
1302 { "log", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_LOG }, INT_MIN, INT_MAX, FLAGS, "predm" },
1303 { "ch_mode", "Stereo decorrelation mode", offsetof(FlacEncodeContext, options.ch_mode), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, FLAC_CHMODE_MID_SIDE, FLAGS, "ch_mode" },
1304 { "auto", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = -1 }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
1305 { "indep", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_INDEPENDENT }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
1306 { "left_side", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_LEFT_SIDE }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
1307 { "right_side", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_RIGHT_SIDE }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
1308 { "mid_side", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_MID_SIDE }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
1309 { NULL },
1310 };
1311
1312 static const AVClass flac_encoder_class = {
1313 "FLAC encoder",
1314 av_default_item_name,
1315 options,
1316 LIBAVUTIL_VERSION_INT,
1317 };
1318
1319 AVCodec ff_flac_encoder = {
1320 .name = "flac",
1321 .type = AVMEDIA_TYPE_AUDIO,
1322 .id = AV_CODEC_ID_FLAC,
1323 .priv_data_size = sizeof(FlacEncodeContext),
1324 .init = flac_encode_init,
1325 .encode2 = flac_encode_frame,
1326 .close = flac_encode_close,
1327 .capabilities = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY,
1328 .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
1329 AV_SAMPLE_FMT_S32,
1330 AV_SAMPLE_FMT_NONE },
1331 .long_name = NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"),
1332 .priv_class = &flac_encoder_class,
1333 };