3 * Copyright (c) 2006 Justin Ruggles <justin.ruggles@gmail.com>
5 * This file is part of FFmpeg.
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.
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.
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
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"
37 #define FLAC_SUBFRAME_CONSTANT 0
38 #define FLAC_SUBFRAME_VERBATIM 1
39 #define FLAC_SUBFRAME_FIXED 8
40 #define FLAC_SUBFRAME_LPC 32
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
50 CODING_MODE_RICE2 = 5,
53 typedef struct CompressionOptions {
54 int compression_level;
56 enum FFLPCType lpc_type;
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;
65 int exact_rice_parameters;
69 typedef struct RiceContext {
70 enum CodingMode coding_mode;
72 int params[MAX_PARTITIONS];
75 typedef struct FlacSubframe {
81 int32_t coefs[MAX_LPC_ORDER];
85 uint32_t rc_udata[FLAC_MAX_BLOCKSIZE];
86 uint64_t rc_sums[32][MAX_PARTITIONS];
88 int32_t samples[FLAC_MAX_BLOCKSIZE];
89 int32_t residual[FLAC_MAX_BLOCKSIZE+11];
92 typedef struct FlacFrame {
93 FlacSubframe subframes[FLAC_MAX_CHANNELS];
101 typedef struct FlacEncodeContext {
111 int max_encoded_framesize;
112 uint32_t frame_count;
113 uint64_t sample_count;
116 CompressionOptions options;
117 AVCodecContext *avctx;
119 struct AVMD5 *md5ctx;
121 unsigned int md5_buffer_size;
122 BswapDSPContext bdsp;
123 FLACDSPContext flac_dsp;
131 * Write streaminfo metadata block to byte array.
133 static void write_streaminfo(FlacEncodeContext *s, uint8_t *header)
137 memset(header, 0, FLAC_STREAMINFO_SIZE);
138 init_put_bits(&pb, header, FLAC_STREAMINFO_SIZE);
140 /* streaminfo metadata block */
141 put_bits(&pb, 16, s->max_blocksize);
142 put_bits(&pb, 16, s->max_blocksize);
143 put_bits(&pb, 24, s->min_framesize);
144 put_bits(&pb, 24, s->max_framesize);
145 put_bits(&pb, 20, s->samplerate);
146 put_bits(&pb, 3, s->channels-1);
147 put_bits(&pb, 5, s->avctx->bits_per_raw_sample - 1);
148 /* write 36-bit sample count in 2 put_bits() calls */
149 put_bits(&pb, 24, (s->sample_count & 0xFFFFFF000LL) >> 12);
150 put_bits(&pb, 12, s->sample_count & 0x000000FFFLL);
152 memcpy(&header[18], s->md5sum, 16);
157 * Set blocksize based on samplerate.
158 * Choose the closest predefined blocksize >= BLOCK_TIME_MS milliseconds.
160 static int select_blocksize(int samplerate, int block_time_ms)
166 av_assert0(samplerate > 0);
167 blocksize = ff_flac_blocksize_table[1];
168 target = (samplerate * block_time_ms) / 1000;
169 for (i = 0; i < 16; i++) {
170 if (target >= ff_flac_blocksize_table[i] &&
171 ff_flac_blocksize_table[i] > blocksize) {
172 blocksize = ff_flac_blocksize_table[i];
179 static av_cold void dprint_compression_options(FlacEncodeContext *s)
181 AVCodecContext *avctx = s->avctx;
182 CompressionOptions *opt = &s->options;
184 av_log(avctx, AV_LOG_DEBUG, " compression: %d\n", opt->compression_level);
186 switch (opt->lpc_type) {
187 case FF_LPC_TYPE_NONE:
188 av_log(avctx, AV_LOG_DEBUG, " lpc type: None\n");
190 case FF_LPC_TYPE_FIXED:
191 av_log(avctx, AV_LOG_DEBUG, " lpc type: Fixed pre-defined coefficients\n");
193 case FF_LPC_TYPE_LEVINSON:
194 av_log(avctx, AV_LOG_DEBUG, " lpc type: Levinson-Durbin recursion with Welch window\n");
196 case FF_LPC_TYPE_CHOLESKY:
197 av_log(avctx, AV_LOG_DEBUG, " lpc type: Cholesky factorization, %d pass%s\n",
198 opt->lpc_passes, opt->lpc_passes == 1 ? "" : "es");
202 av_log(avctx, AV_LOG_DEBUG, " prediction order: %d, %d\n",
203 opt->min_prediction_order, opt->max_prediction_order);
205 switch (opt->prediction_order_method) {
206 case ORDER_METHOD_EST:
207 av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "estimate");
209 case ORDER_METHOD_2LEVEL:
210 av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "2-level");
212 case ORDER_METHOD_4LEVEL:
213 av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "4-level");
215 case ORDER_METHOD_8LEVEL:
216 av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "8-level");
218 case ORDER_METHOD_SEARCH:
219 av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "full search");
221 case ORDER_METHOD_LOG:
222 av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "log search");
227 av_log(avctx, AV_LOG_DEBUG, " partition order: %d, %d\n",
228 opt->min_partition_order, opt->max_partition_order);
230 av_log(avctx, AV_LOG_DEBUG, " block size: %d\n", avctx->frame_size);
232 av_log(avctx, AV_LOG_DEBUG, " lpc precision: %d\n",
233 opt->lpc_coeff_precision);
237 static av_cold int flac_encode_init(AVCodecContext *avctx)
239 int freq = avctx->sample_rate;
240 int channels = avctx->channels;
241 FlacEncodeContext *s = avctx->priv_data;
247 switch (avctx->sample_fmt) {
248 case AV_SAMPLE_FMT_S16:
249 avctx->bits_per_raw_sample = 16;
252 case AV_SAMPLE_FMT_S32:
253 if (avctx->bits_per_raw_sample != 24)
254 av_log(avctx, AV_LOG_WARNING, "encoding as 24 bits-per-sample\n");
255 avctx->bits_per_raw_sample = 24;
260 if (channels < 1 || channels > FLAC_MAX_CHANNELS) {
261 av_log(avctx, AV_LOG_ERROR, "%d channels not supported (max %d)\n",
262 channels, FLAC_MAX_CHANNELS);
263 return AVERROR(EINVAL);
265 s->channels = channels;
267 /* find samplerate in table */
270 for (i = 4; i < 12; i++) {
271 if (freq == ff_flac_sample_rate_table[i]) {
272 s->samplerate = ff_flac_sample_rate_table[i];
278 /* if not in table, samplerate is non-standard */
280 if (freq % 1000 == 0 && freq < 255000) {
282 s->sr_code[1] = freq / 1000;
283 } else if (freq % 10 == 0 && freq < 655350) {
285 s->sr_code[1] = freq / 10;
286 } else if (freq < 65535) {
288 s->sr_code[1] = freq;
290 av_log(avctx, AV_LOG_ERROR, "%d Hz not supported\n", freq);
291 return AVERROR(EINVAL);
293 s->samplerate = freq;
296 /* set compression option defaults based on avctx->compression_level */
297 if (avctx->compression_level < 0)
298 s->options.compression_level = 5;
300 s->options.compression_level = avctx->compression_level;
302 level = s->options.compression_level;
304 av_log(avctx, AV_LOG_ERROR, "invalid compression level: %d\n",
305 s->options.compression_level);
306 return AVERROR(EINVAL);
309 s->options.block_time_ms = ((int[]){ 27, 27, 27,105,105,105,105,105,105,105,105,105,105})[level];
311 if (s->options.lpc_type == FF_LPC_TYPE_DEFAULT)
312 s->options.lpc_type = ((int[]){ FF_LPC_TYPE_FIXED, FF_LPC_TYPE_FIXED, FF_LPC_TYPE_FIXED,
313 FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON,
314 FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON,
315 FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON,
316 FF_LPC_TYPE_LEVINSON})[level];
318 if (s->options.min_prediction_order < 0)
319 s->options.min_prediction_order = ((int[]){ 2, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1})[level];
320 if (s->options.max_prediction_order < 0)
321 s->options.max_prediction_order = ((int[]){ 3, 4, 4, 6, 8, 8, 8, 8, 12, 12, 12, 32, 32})[level];
323 if (s->options.prediction_order_method < 0)
324 s->options.prediction_order_method = ((int[]){ ORDER_METHOD_EST, ORDER_METHOD_EST, ORDER_METHOD_EST,
325 ORDER_METHOD_EST, ORDER_METHOD_EST, ORDER_METHOD_EST,
326 ORDER_METHOD_4LEVEL, ORDER_METHOD_LOG, ORDER_METHOD_4LEVEL,
327 ORDER_METHOD_LOG, ORDER_METHOD_SEARCH, ORDER_METHOD_LOG,
328 ORDER_METHOD_SEARCH})[level];
330 if (s->options.min_partition_order > s->options.max_partition_order) {
331 av_log(avctx, AV_LOG_ERROR, "invalid partition orders: min=%d max=%d\n",
332 s->options.min_partition_order, s->options.max_partition_order);
333 return AVERROR(EINVAL);
335 if (s->options.min_partition_order < 0)
336 s->options.min_partition_order = ((int[]){ 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0})[level];
337 if (s->options.max_partition_order < 0)
338 s->options.max_partition_order = ((int[]){ 2, 2, 3, 3, 3, 8, 8, 8, 8, 8, 8, 8, 8})[level];
340 #if FF_API_PRIVATE_OPT
341 FF_DISABLE_DEPRECATION_WARNINGS
342 if (avctx->min_prediction_order >= 0) {
343 if (s->options.lpc_type == FF_LPC_TYPE_FIXED) {
344 if (avctx->min_prediction_order > MAX_FIXED_ORDER) {
345 av_log(avctx, AV_LOG_WARNING,
346 "invalid min prediction order %d, clamped to %d\n",
347 avctx->min_prediction_order, MAX_FIXED_ORDER);
348 avctx->min_prediction_order = MAX_FIXED_ORDER;
350 } else if (avctx->min_prediction_order < MIN_LPC_ORDER ||
351 avctx->min_prediction_order > MAX_LPC_ORDER) {
352 av_log(avctx, AV_LOG_ERROR, "invalid min prediction order: %d\n",
353 avctx->min_prediction_order);
354 return AVERROR(EINVAL);
356 s->options.min_prediction_order = avctx->min_prediction_order;
358 if (avctx->max_prediction_order >= 0) {
359 if (s->options.lpc_type == FF_LPC_TYPE_FIXED) {
360 if (avctx->max_prediction_order > MAX_FIXED_ORDER) {
361 av_log(avctx, AV_LOG_WARNING,
362 "invalid max prediction order %d, clamped to %d\n",
363 avctx->max_prediction_order, MAX_FIXED_ORDER);
364 avctx->max_prediction_order = MAX_FIXED_ORDER;
366 } else if (avctx->max_prediction_order < MIN_LPC_ORDER ||
367 avctx->max_prediction_order > MAX_LPC_ORDER) {
368 av_log(avctx, AV_LOG_ERROR, "invalid max prediction order: %d\n",
369 avctx->max_prediction_order);
370 return AVERROR(EINVAL);
372 s->options.max_prediction_order = avctx->max_prediction_order;
374 FF_ENABLE_DEPRECATION_WARNINGS
376 if (s->options.lpc_type == FF_LPC_TYPE_NONE) {
377 s->options.min_prediction_order = 0;
378 s->options.max_prediction_order = 0;
379 } else if (s->options.lpc_type == FF_LPC_TYPE_FIXED) {
380 if (s->options.min_prediction_order > MAX_FIXED_ORDER) {
381 av_log(avctx, AV_LOG_WARNING,
382 "invalid min prediction order %d, clamped to %d\n",
383 s->options.min_prediction_order, MAX_FIXED_ORDER);
384 s->options.min_prediction_order = MAX_FIXED_ORDER;
386 if (s->options.max_prediction_order > MAX_FIXED_ORDER) {
387 av_log(avctx, AV_LOG_WARNING,
388 "invalid max prediction order %d, clamped to %d\n",
389 s->options.max_prediction_order, MAX_FIXED_ORDER);
390 s->options.max_prediction_order = MAX_FIXED_ORDER;
394 if (s->options.max_prediction_order < s->options.min_prediction_order) {
395 av_log(avctx, AV_LOG_ERROR, "invalid prediction orders: min=%d max=%d\n",
396 s->options.min_prediction_order, s->options.max_prediction_order);
397 return AVERROR(EINVAL);
400 if (avctx->frame_size > 0) {
401 if (avctx->frame_size < FLAC_MIN_BLOCKSIZE ||
402 avctx->frame_size > FLAC_MAX_BLOCKSIZE) {
403 av_log(avctx, AV_LOG_ERROR, "invalid block size: %d\n",
405 return AVERROR(EINVAL);
408 s->avctx->frame_size = select_blocksize(s->samplerate, s->options.block_time_ms);
410 s->max_blocksize = s->avctx->frame_size;
412 /* set maximum encoded frame size in verbatim mode */
413 s->max_framesize = ff_flac_get_max_frame_size(s->avctx->frame_size,
415 s->avctx->bits_per_raw_sample);
417 /* initialize MD5 context */
418 s->md5ctx = av_md5_alloc();
420 return AVERROR(ENOMEM);
421 av_md5_init(s->md5ctx);
423 streaminfo = av_malloc(FLAC_STREAMINFO_SIZE);
425 return AVERROR(ENOMEM);
426 write_streaminfo(s, streaminfo);
427 avctx->extradata = streaminfo;
428 avctx->extradata_size = FLAC_STREAMINFO_SIZE;
431 s->min_framesize = s->max_framesize;
434 avctx->channel_layout != (AV_CH_LAYOUT_STEREO|AV_CH_FRONT_CENTER) ||
436 avctx->channel_layout != AV_CH_LAYOUT_2_2 &&
437 avctx->channel_layout != AV_CH_LAYOUT_QUAD ||
439 avctx->channel_layout != AV_CH_LAYOUT_5POINT0 &&
440 avctx->channel_layout != AV_CH_LAYOUT_5POINT0_BACK ||
442 avctx->channel_layout != AV_CH_LAYOUT_5POINT1 &&
443 avctx->channel_layout != AV_CH_LAYOUT_5POINT1_BACK) {
444 if (avctx->channel_layout) {
445 av_log(avctx, AV_LOG_ERROR, "Channel layout not supported by Flac, "
446 "output stream will have incorrect "
447 "channel layout.\n");
449 av_log(avctx, AV_LOG_WARNING, "No channel layout specified. The encoder "
450 "will use Flac channel layout for "
451 "%d channels.\n", channels);
455 ret = ff_lpc_init(&s->lpc_ctx, avctx->frame_size,
456 s->options.max_prediction_order, FF_LPC_TYPE_LEVINSON);
458 ff_bswapdsp_init(&s->bdsp);
459 ff_flacdsp_init(&s->flac_dsp, avctx->sample_fmt, channels,
460 avctx->bits_per_raw_sample);
462 dprint_compression_options(s);
468 static void init_frame(FlacEncodeContext *s, int nb_samples)
475 for (i = 0; i < 16; i++) {
476 if (nb_samples == ff_flac_blocksize_table[i]) {
477 frame->blocksize = ff_flac_blocksize_table[i];
478 frame->bs_code[0] = i;
479 frame->bs_code[1] = 0;
484 frame->blocksize = nb_samples;
485 if (frame->blocksize <= 256) {
486 frame->bs_code[0] = 6;
487 frame->bs_code[1] = frame->blocksize-1;
489 frame->bs_code[0] = 7;
490 frame->bs_code[1] = frame->blocksize-1;
494 for (ch = 0; ch < s->channels; ch++) {
495 FlacSubframe *sub = &frame->subframes[ch];
498 sub->obits = s->avctx->bits_per_raw_sample;
501 sub->rc.coding_mode = CODING_MODE_RICE2;
503 sub->rc.coding_mode = CODING_MODE_RICE;
506 frame->verbatim_only = 0;
511 * Copy channel-interleaved input samples into separate subframes.
513 static void copy_samples(FlacEncodeContext *s, const void *samples)
517 int shift = av_get_bytes_per_sample(s->avctx->sample_fmt) * 8 -
518 s->avctx->bits_per_raw_sample;
520 #define COPY_SAMPLES(bits) do { \
521 const int ## bits ## _t *samples0 = samples; \
523 for (i = 0, j = 0; i < frame->blocksize; i++) \
524 for (ch = 0; ch < s->channels; ch++, j++) \
525 frame->subframes[ch].samples[i] = samples0[j] >> shift; \
528 if (s->avctx->sample_fmt == AV_SAMPLE_FMT_S16)
535 static uint64_t rice_count_exact(const int32_t *res, int n, int k)
540 for (i = 0; i < n; i++) {
541 int32_t v = -2 * res[i] - 1;
543 count += (v >> k) + 1 + k;
549 static uint64_t subframe_count_exact(FlacEncodeContext *s, FlacSubframe *sub,
552 int p, porder, psize;
556 /* subframe header */
560 count += sub->wasted;
563 if (sub->type == FLAC_SUBFRAME_CONSTANT) {
565 } else if (sub->type == FLAC_SUBFRAME_VERBATIM) {
566 count += s->frame.blocksize * sub->obits;
568 /* warm-up samples */
569 count += pred_order * sub->obits;
571 /* LPC coefficients */
572 if (sub->type == FLAC_SUBFRAME_LPC)
573 count += 4 + 5 + pred_order * s->options.lpc_coeff_precision;
575 /* rice-encoded block */
578 /* partition order */
579 porder = sub->rc.porder;
580 psize = s->frame.blocksize >> porder;
586 for (p = 0; p < 1 << porder; p++) {
587 int k = sub->rc.params[p];
588 count += sub->rc.coding_mode;
589 count += rice_count_exact(&sub->residual[i], part_end - i, k);
591 part_end = FFMIN(s->frame.blocksize, part_end + psize);
599 #define rice_encode_count(sum, n, k) (((n)*((k)+1))+((sum-(n>>1))>>(k)))
602 * Solve for d/dk(rice_encode_count) = n-((sum-(n>>1))>>(k+1)) = 0.
604 static int find_optimal_param(uint64_t sum, int n, int max_param)
611 sum2 = sum - (n >> 1);
612 k = av_log2(av_clipl_int32(sum2 / n));
613 return FFMIN(k, max_param);
616 static int find_optimal_param_exact(uint64_t sums[32][MAX_PARTITIONS], int i, int max_param)
619 int64_t bestbits = INT64_MAX;
622 for (k = 0; k <= max_param; k++) {
623 int64_t bits = sums[k][i];
624 if (bits < bestbits) {
633 static uint64_t calc_optimal_rice_params(RiceContext *rc, int porder,
634 uint64_t sums[32][MAX_PARTITIONS],
635 int n, int pred_order, int max_param, int exact)
641 part = (1 << porder);
644 cnt = (n >> porder) - pred_order;
645 for (i = 0; i < part; i++) {
647 k = find_optimal_param_exact(sums, i, max_param);
648 all_bits += sums[k][i];
650 k = find_optimal_param(sums[0][i], cnt, max_param);
651 all_bits += rice_encode_count(sums[0][i], cnt, k);
663 static void calc_sum_top(int pmax, int kmax, const uint32_t *data, int n, int pred_order,
664 uint64_t sums[32][MAX_PARTITIONS])
668 const uint32_t *res, *res_end;
670 /* sums for highest level */
673 for (k = 0; k <= kmax; k++) {
674 res = &data[pred_order];
675 res_end = &data[n >> pmax];
676 for (i = 0; i < parts; i++) {
678 uint64_t sum = (1LL + k) * (res_end - res);
679 while (res < res_end)
680 sum += *(res++) >> k;
684 while (res < res_end)
688 res_end += n >> pmax;
693 static void calc_sum_next(int level, uint64_t sums[32][MAX_PARTITIONS], int kmax)
696 int parts = (1 << level);
697 for (i = 0; i < parts; i++) {
698 for (k=0; k<=kmax; k++)
699 sums[k][i] = sums[k][2*i] + sums[k][2*i+1];
703 static uint64_t calc_rice_params(RiceContext *rc,
704 uint32_t udata[FLAC_MAX_BLOCKSIZE],
705 uint64_t sums[32][MAX_PARTITIONS],
707 const int32_t *data, int n, int pred_order, int exact)
710 uint64_t bits[MAX_PARTITION_ORDER+1];
713 int kmax = (1 << rc->coding_mode) - 2;
715 av_assert1(pmin >= 0 && pmin <= MAX_PARTITION_ORDER);
716 av_assert1(pmax >= 0 && pmax <= MAX_PARTITION_ORDER);
717 av_assert1(pmin <= pmax);
719 tmp_rc.coding_mode = rc->coding_mode;
721 for (i = 0; i < n; i++)
722 udata[i] = (2 * data[i]) ^ (data[i] >> 31);
724 calc_sum_top(pmax, exact ? kmax : 0, udata, n, pred_order, sums);
727 bits[pmin] = UINT32_MAX;
729 bits[i] = calc_optimal_rice_params(&tmp_rc, i, sums, n, pred_order, kmax, exact);
730 if (bits[i] < bits[opt_porder] || pmax == pmin) {
736 calc_sum_next(--i, sums, exact ? kmax : 0);
739 return bits[opt_porder];
743 static int get_max_p_order(int max_porder, int n, int order)
745 int porder = FFMIN(max_porder, av_log2(n^(n-1)));
747 porder = FFMIN(porder, av_log2(n/order));
752 static uint64_t find_subframe_rice_params(FlacEncodeContext *s,
753 FlacSubframe *sub, int pred_order)
755 int pmin = get_max_p_order(s->options.min_partition_order,
756 s->frame.blocksize, pred_order);
757 int pmax = get_max_p_order(s->options.max_partition_order,
758 s->frame.blocksize, pred_order);
760 uint64_t bits = 8 + pred_order * sub->obits + 2 + sub->rc.coding_mode;
761 if (sub->type == FLAC_SUBFRAME_LPC)
762 bits += 4 + 5 + pred_order * s->options.lpc_coeff_precision;
763 bits += calc_rice_params(&sub->rc, sub->rc_udata, sub->rc_sums, pmin, pmax, sub->residual,
764 s->frame.blocksize, pred_order, s->options.exact_rice_parameters);
769 static void encode_residual_fixed(int32_t *res, const int32_t *smp, int n,
774 for (i = 0; i < order; i++)
778 for (i = order; i < n; i++)
780 } else if (order == 1) {
781 for (i = order; i < n; i++)
782 res[i] = smp[i] - smp[i-1];
783 } else if (order == 2) {
784 int a = smp[order-1] - smp[order-2];
785 for (i = order; i < n; i += 2) {
786 int b = smp[i ] - smp[i-1];
788 a = smp[i+1] - smp[i ];
791 } else if (order == 3) {
792 int a = smp[order-1] - smp[order-2];
793 int c = smp[order-1] - 2*smp[order-2] + smp[order-3];
794 for (i = order; i < n; i += 2) {
795 int b = smp[i ] - smp[i-1];
798 a = smp[i+1] - smp[i ];
803 int a = smp[order-1] - smp[order-2];
804 int c = smp[order-1] - 2*smp[order-2] + smp[order-3];
805 int e = smp[order-1] - 3*smp[order-2] + 3*smp[order-3] - smp[order-4];
806 for (i = order; i < n; i += 2) {
807 int b = smp[i ] - smp[i-1];
811 a = smp[i+1] - smp[i ];
820 static int encode_residual_ch(FlacEncodeContext *s, int ch)
823 int min_order, max_order, opt_order, omethod;
826 int32_t coefs[MAX_LPC_ORDER][MAX_LPC_ORDER];
827 int shift[MAX_LPC_ORDER];
831 sub = &frame->subframes[ch];
834 n = frame->blocksize;
837 for (i = 1; i < n; i++)
841 sub->type = sub->type_code = FLAC_SUBFRAME_CONSTANT;
843 return subframe_count_exact(s, sub, 0);
847 if (frame->verbatim_only || n < 5) {
848 sub->type = sub->type_code = FLAC_SUBFRAME_VERBATIM;
849 memcpy(res, smp, n * sizeof(int32_t));
850 return subframe_count_exact(s, sub, 0);
853 min_order = s->options.min_prediction_order;
854 max_order = s->options.max_prediction_order;
855 omethod = s->options.prediction_order_method;
858 sub->type = FLAC_SUBFRAME_FIXED;
859 if (s->options.lpc_type == FF_LPC_TYPE_NONE ||
860 s->options.lpc_type == FF_LPC_TYPE_FIXED || n <= max_order) {
861 uint64_t bits[MAX_FIXED_ORDER+1];
862 if (max_order > MAX_FIXED_ORDER)
863 max_order = MAX_FIXED_ORDER;
865 bits[0] = UINT32_MAX;
866 for (i = min_order; i <= max_order; i++) {
867 encode_residual_fixed(res, smp, n, i);
868 bits[i] = find_subframe_rice_params(s, sub, i);
869 if (bits[i] < bits[opt_order])
872 sub->order = opt_order;
873 sub->type_code = sub->type | sub->order;
874 if (sub->order != max_order) {
875 encode_residual_fixed(res, smp, n, sub->order);
876 find_subframe_rice_params(s, sub, sub->order);
878 return subframe_count_exact(s, sub, sub->order);
882 sub->type = FLAC_SUBFRAME_LPC;
883 opt_order = ff_lpc_calc_coefs(&s->lpc_ctx, smp, n, min_order, max_order,
884 s->options.lpc_coeff_precision, coefs, shift, s->options.lpc_type,
885 s->options.lpc_passes, omethod,
888 if (omethod == ORDER_METHOD_2LEVEL ||
889 omethod == ORDER_METHOD_4LEVEL ||
890 omethod == ORDER_METHOD_8LEVEL) {
891 int levels = 1 << omethod;
892 uint64_t bits[1 << ORDER_METHOD_8LEVEL];
894 int opt_index = levels-1;
895 opt_order = max_order-1;
896 bits[opt_index] = UINT32_MAX;
897 for (i = levels-1; i >= 0; i--) {
898 int last_order = order;
899 order = min_order + (((max_order-min_order+1) * (i+1)) / levels)-1;
900 order = av_clip(order, min_order - 1, max_order - 1);
901 if (order == last_order)
903 if (s->bps_code * 4 + s->options.lpc_coeff_precision + av_log2(order) <= 32) {
904 s->flac_dsp.lpc16_encode(res, smp, n, order+1, coefs[order],
907 s->flac_dsp.lpc32_encode(res, smp, n, order+1, coefs[order],
910 bits[i] = find_subframe_rice_params(s, sub, order+1);
911 if (bits[i] < bits[opt_index]) {
917 } else if (omethod == ORDER_METHOD_SEARCH) {
918 // brute-force optimal order search
919 uint64_t bits[MAX_LPC_ORDER];
921 bits[0] = UINT32_MAX;
922 for (i = min_order-1; i < max_order; i++) {
923 if (s->bps_code * 4 + s->options.lpc_coeff_precision + av_log2(i) <= 32) {
924 s->flac_dsp.lpc16_encode(res, smp, n, i+1, coefs[i], shift[i]);
926 s->flac_dsp.lpc32_encode(res, smp, n, i+1, coefs[i], shift[i]);
928 bits[i] = find_subframe_rice_params(s, sub, i+1);
929 if (bits[i] < bits[opt_order])
933 } else if (omethod == ORDER_METHOD_LOG) {
934 uint64_t bits[MAX_LPC_ORDER];
937 opt_order = min_order - 1 + (max_order-min_order)/3;
938 memset(bits, -1, sizeof(bits));
940 for (step = 16; step; step >>= 1) {
941 int last = opt_order;
942 for (i = last-step; i <= last+step; i += step) {
943 if (i < min_order-1 || i >= max_order || bits[i] < UINT32_MAX)
945 if (s->bps_code * 4 + s->options.lpc_coeff_precision + av_log2(i) <= 32) {
946 s->flac_dsp.lpc32_encode(res, smp, n, i+1, coefs[i], shift[i]);
948 s->flac_dsp.lpc16_encode(res, smp, n, i+1, coefs[i], shift[i]);
950 bits[i] = find_subframe_rice_params(s, sub, i+1);
951 if (bits[i] < bits[opt_order])
958 if (s->options.multi_dim_quant) {
960 int i, step, improved;
961 int64_t best_score = INT64_MAX;
964 qmax = (1 << (s->options.lpc_coeff_precision - 1)) - 1;
966 for (i=0; i<opt_order; i++)
971 for (step = 0; step < allsteps; step++) {
973 int32_t lpc_try[MAX_LPC_ORDER];
977 for (i=0; i<opt_order; i++) {
978 int diff = ((tmp + 1) % 3) - 1;
979 lpc_try[i] = av_clip(coefs[opt_order - 1][i] + diff, -qmax, qmax);
986 if (s->bps_code * 4 + s->options.lpc_coeff_precision + av_log2(opt_order - 1) <= 32) {
987 s->flac_dsp.lpc16_encode(res, smp, n, opt_order, lpc_try, shift[opt_order-1]);
989 s->flac_dsp.lpc32_encode(res, smp, n, opt_order, lpc_try, shift[opt_order-1]);
991 score = find_subframe_rice_params(s, sub, opt_order);
992 if (score < best_score) {
994 memcpy(coefs[opt_order-1], lpc_try, sizeof(*coefs));
1001 sub->order = opt_order;
1002 sub->type_code = sub->type | (sub->order-1);
1003 sub->shift = shift[sub->order-1];
1004 for (i = 0; i < sub->order; i++)
1005 sub->coefs[i] = coefs[sub->order-1][i];
1007 if (s->bps_code * 4 + s->options.lpc_coeff_precision + av_log2(opt_order) <= 32) {
1008 s->flac_dsp.lpc16_encode(res, smp, n, sub->order, sub->coefs, sub->shift);
1010 s->flac_dsp.lpc32_encode(res, smp, n, sub->order, sub->coefs, sub->shift);
1013 find_subframe_rice_params(s, sub, sub->order);
1015 return subframe_count_exact(s, sub, sub->order);
1019 static int count_frame_header(FlacEncodeContext *s)
1021 uint8_t av_unused tmp;
1027 <1> Blocking strategy
1028 <4> Block size in inter-channel samples
1030 <4> Channel assignment
1031 <3> Sample size in bits
1036 /* coded frame number */
1037 PUT_UTF8(s->frame_count, tmp, count += 8;)
1039 /* explicit block size */
1040 if (s->frame.bs_code[0] == 6)
1042 else if (s->frame.bs_code[0] == 7)
1045 /* explicit sample rate */
1046 count += ((s->sr_code[0] == 12) + (s->sr_code[0] > 12) * 2) * 8;
1048 /* frame header CRC-8 */
1055 static int encode_frame(FlacEncodeContext *s)
1060 count = count_frame_header(s);
1062 for (ch = 0; ch < s->channels; ch++)
1063 count += encode_residual_ch(s, ch);
1065 count += (8 - (count & 7)) & 7; // byte alignment
1066 count += 16; // CRC-16
1069 if (count > INT_MAX)
1075 static void remove_wasted_bits(FlacEncodeContext *s)
1079 for (ch = 0; ch < s->channels; ch++) {
1080 FlacSubframe *sub = &s->frame.subframes[ch];
1083 for (i = 0; i < s->frame.blocksize; i++) {
1084 v |= sub->samples[i];
1089 if (v && !(v & 1)) {
1092 for (i = 0; i < s->frame.blocksize; i++)
1093 sub->samples[i] >>= v;
1098 /* for 24-bit, check if removing wasted bits makes the range better
1099 suited for using RICE instead of RICE2 for entropy coding */
1100 if (sub->obits <= 17)
1101 sub->rc.coding_mode = CODING_MODE_RICE;
1107 static int estimate_stereo_mode(const int32_t *left_ch, const int32_t *right_ch, int n,
1116 /* calculate sum of 2nd order residual for each channel */
1117 sum[0] = sum[1] = sum[2] = sum[3] = 0;
1118 for (i = 2; i < n; i++) {
1119 lt = left_ch[i] - 2*left_ch[i-1] + left_ch[i-2];
1120 rt = right_ch[i] - 2*right_ch[i-1] + right_ch[i-2];
1121 sum[2] += FFABS((lt + rt) >> 1);
1122 sum[3] += FFABS(lt - rt);
1123 sum[0] += FFABS(lt);
1124 sum[1] += FFABS(rt);
1126 /* estimate bit counts */
1127 for (i = 0; i < 4; i++) {
1128 k = find_optimal_param(2 * sum[i], n, max_rice_param);
1129 sum[i] = rice_encode_count( 2 * sum[i], n, k);
1132 /* calculate score for each mode */
1133 score[0] = sum[0] + sum[1];
1134 score[1] = sum[0] + sum[3];
1135 score[2] = sum[1] + sum[3];
1136 score[3] = sum[2] + sum[3];
1138 /* return mode with lowest score */
1140 for (i = 1; i < 4; i++)
1141 if (score[i] < score[best])
1149 * Perform stereo channel decorrelation.
1151 static void channel_decorrelation(FlacEncodeContext *s)
1154 int32_t *left, *right;
1158 n = frame->blocksize;
1159 left = frame->subframes[0].samples;
1160 right = frame->subframes[1].samples;
1162 if (s->channels != 2) {
1163 frame->ch_mode = FLAC_CHMODE_INDEPENDENT;
1167 if (s->options.ch_mode < 0) {
1168 int max_rice_param = (1 << frame->subframes[0].rc.coding_mode) - 2;
1169 frame->ch_mode = estimate_stereo_mode(left, right, n, max_rice_param);
1171 frame->ch_mode = s->options.ch_mode;
1173 /* perform decorrelation and adjust bits-per-sample */
1174 if (frame->ch_mode == FLAC_CHMODE_INDEPENDENT)
1176 if (frame->ch_mode == FLAC_CHMODE_MID_SIDE) {
1178 for (i = 0; i < n; i++) {
1180 left[i] = (tmp + right[i]) >> 1;
1181 right[i] = tmp - right[i];
1183 frame->subframes[1].obits++;
1184 } else if (frame->ch_mode == FLAC_CHMODE_LEFT_SIDE) {
1185 for (i = 0; i < n; i++)
1186 right[i] = left[i] - right[i];
1187 frame->subframes[1].obits++;
1189 for (i = 0; i < n; i++)
1190 left[i] -= right[i];
1191 frame->subframes[0].obits++;
1196 static void write_utf8(PutBitContext *pb, uint32_t val)
1199 PUT_UTF8(val, tmp, put_bits(pb, 8, tmp);)
1203 static void write_frame_header(FlacEncodeContext *s)
1210 put_bits(&s->pb, 16, 0xFFF8);
1211 put_bits(&s->pb, 4, frame->bs_code[0]);
1212 put_bits(&s->pb, 4, s->sr_code[0]);
1214 if (frame->ch_mode == FLAC_CHMODE_INDEPENDENT)
1215 put_bits(&s->pb, 4, s->channels-1);
1217 put_bits(&s->pb, 4, frame->ch_mode + FLAC_MAX_CHANNELS - 1);
1219 put_bits(&s->pb, 3, s->bps_code);
1220 put_bits(&s->pb, 1, 0);
1221 write_utf8(&s->pb, s->frame_count);
1223 if (frame->bs_code[0] == 6)
1224 put_bits(&s->pb, 8, frame->bs_code[1]);
1225 else if (frame->bs_code[0] == 7)
1226 put_bits(&s->pb, 16, frame->bs_code[1]);
1228 if (s->sr_code[0] == 12)
1229 put_bits(&s->pb, 8, s->sr_code[1]);
1230 else if (s->sr_code[0] > 12)
1231 put_bits(&s->pb, 16, s->sr_code[1]);
1233 flush_put_bits(&s->pb);
1234 crc = av_crc(av_crc_get_table(AV_CRC_8_ATM), 0, s->pb.buf,
1235 put_bits_count(&s->pb) >> 3);
1236 put_bits(&s->pb, 8, crc);
1240 static void write_subframes(FlacEncodeContext *s)
1244 for (ch = 0; ch < s->channels; ch++) {
1245 FlacSubframe *sub = &s->frame.subframes[ch];
1246 int i, p, porder, psize;
1248 int32_t *res = sub->residual;
1249 int32_t *frame_end = &sub->residual[s->frame.blocksize];
1251 /* subframe header */
1252 put_bits(&s->pb, 1, 0);
1253 put_bits(&s->pb, 6, sub->type_code);
1254 put_bits(&s->pb, 1, !!sub->wasted);
1256 put_bits(&s->pb, sub->wasted, 1);
1259 if (sub->type == FLAC_SUBFRAME_CONSTANT) {
1260 put_sbits(&s->pb, sub->obits, res[0]);
1261 } else if (sub->type == FLAC_SUBFRAME_VERBATIM) {
1262 while (res < frame_end)
1263 put_sbits(&s->pb, sub->obits, *res++);
1265 /* warm-up samples */
1266 for (i = 0; i < sub->order; i++)
1267 put_sbits(&s->pb, sub->obits, *res++);
1269 /* LPC coefficients */
1270 if (sub->type == FLAC_SUBFRAME_LPC) {
1271 int cbits = s->options.lpc_coeff_precision;
1272 put_bits( &s->pb, 4, cbits-1);
1273 put_sbits(&s->pb, 5, sub->shift);
1274 for (i = 0; i < sub->order; i++)
1275 put_sbits(&s->pb, cbits, sub->coefs[i]);
1278 /* rice-encoded block */
1279 put_bits(&s->pb, 2, sub->rc.coding_mode - 4);
1281 /* partition order */
1282 porder = sub->rc.porder;
1283 psize = s->frame.blocksize >> porder;
1284 put_bits(&s->pb, 4, porder);
1287 part_end = &sub->residual[psize];
1288 for (p = 0; p < 1 << porder; p++) {
1289 int k = sub->rc.params[p];
1290 put_bits(&s->pb, sub->rc.coding_mode, k);
1291 while (res < part_end)
1292 set_sr_golomb_flac(&s->pb, *res++, k, INT32_MAX, 0);
1293 part_end = FFMIN(frame_end, part_end + psize);
1300 static void write_frame_footer(FlacEncodeContext *s)
1303 flush_put_bits(&s->pb);
1304 crc = av_bswap16(av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0, s->pb.buf,
1305 put_bits_count(&s->pb)>>3));
1306 put_bits(&s->pb, 16, crc);
1307 flush_put_bits(&s->pb);
1311 static int write_frame(FlacEncodeContext *s, AVPacket *avpkt)
1313 init_put_bits(&s->pb, avpkt->data, avpkt->size);
1314 write_frame_header(s);
1316 write_frame_footer(s);
1317 return put_bits_count(&s->pb) >> 3;
1321 static int update_md5_sum(FlacEncodeContext *s, const void *samples)
1324 int buf_size = s->frame.blocksize * s->channels *
1325 ((s->avctx->bits_per_raw_sample + 7) / 8);
1327 if (s->avctx->bits_per_raw_sample > 16 || HAVE_BIGENDIAN) {
1328 av_fast_malloc(&s->md5_buffer, &s->md5_buffer_size, buf_size);
1330 return AVERROR(ENOMEM);
1333 if (s->avctx->bits_per_raw_sample <= 16) {
1334 buf = (const uint8_t *)samples;
1336 s->bdsp.bswap16_buf((uint16_t *) s->md5_buffer,
1337 (const uint16_t *) samples, buf_size / 2);
1338 buf = s->md5_buffer;
1342 const int32_t *samples0 = samples;
1343 uint8_t *tmp = s->md5_buffer;
1345 for (i = 0; i < s->frame.blocksize * s->channels; i++) {
1346 int32_t v = samples0[i] >> 8;
1347 AV_WL24(tmp + 3*i, v);
1349 buf = s->md5_buffer;
1351 av_md5_update(s->md5ctx, buf, buf_size);
1357 static int flac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
1358 const AVFrame *frame, int *got_packet_ptr)
1360 FlacEncodeContext *s;
1361 int frame_bytes, out_bytes, ret;
1363 s = avctx->priv_data;
1365 /* when the last block is reached, update the header in extradata */
1367 s->max_framesize = s->max_encoded_framesize;
1368 av_md5_final(s->md5ctx, s->md5sum);
1369 write_streaminfo(s, avctx->extradata);
1371 #if FF_API_SIDEDATA_ONLY_PKT
1372 FF_DISABLE_DEPRECATION_WARNINGS
1373 if (avctx->side_data_only_packets && !s->flushed) {
1374 FF_ENABLE_DEPRECATION_WARNINGS
1378 uint8_t *side_data = av_packet_new_side_data(avpkt, AV_PKT_DATA_NEW_EXTRADATA,
1379 avctx->extradata_size);
1381 return AVERROR(ENOMEM);
1382 memcpy(side_data, avctx->extradata, avctx->extradata_size);
1384 avpkt->pts = s->next_pts;
1386 *got_packet_ptr = 1;
1393 /* change max_framesize for small final frame */
1394 if (frame->nb_samples < s->frame.blocksize) {
1395 s->max_framesize = ff_flac_get_max_frame_size(frame->nb_samples,
1397 avctx->bits_per_raw_sample);
1400 init_frame(s, frame->nb_samples);
1402 copy_samples(s, frame->data[0]);
1404 channel_decorrelation(s);
1406 remove_wasted_bits(s);
1408 frame_bytes = encode_frame(s);
1410 /* Fall back on verbatim mode if the compressed frame is larger than it
1411 would be if encoded uncompressed. */
1412 if (frame_bytes < 0 || frame_bytes > s->max_framesize) {
1413 s->frame.verbatim_only = 1;
1414 frame_bytes = encode_frame(s);
1415 if (frame_bytes < 0) {
1416 av_log(avctx, AV_LOG_ERROR, "Bad frame count\n");
1421 if ((ret = ff_alloc_packet2(avctx, avpkt, frame_bytes, 0)) < 0)
1424 out_bytes = write_frame(s, avpkt);
1427 s->sample_count += frame->nb_samples;
1428 if ((ret = update_md5_sum(s, frame->data[0])) < 0) {
1429 av_log(avctx, AV_LOG_ERROR, "Error updating MD5 checksum\n");
1432 if (out_bytes > s->max_encoded_framesize)
1433 s->max_encoded_framesize = out_bytes;
1434 if (out_bytes < s->min_framesize)
1435 s->min_framesize = out_bytes;
1437 avpkt->pts = frame->pts;
1438 avpkt->duration = ff_samples_to_time_base(avctx, frame->nb_samples);
1439 avpkt->size = out_bytes;
1441 s->next_pts = avpkt->pts + avpkt->duration;
1443 *got_packet_ptr = 1;
1448 static av_cold int flac_encode_close(AVCodecContext *avctx)
1450 if (avctx->priv_data) {
1451 FlacEncodeContext *s = avctx->priv_data;
1452 av_freep(&s->md5ctx);
1453 av_freep(&s->md5_buffer);
1454 ff_lpc_end(&s->lpc_ctx);
1456 av_freep(&avctx->extradata);
1457 avctx->extradata_size = 0;
1461 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM
1462 static const AVOption options[] = {
1463 { "lpc_coeff_precision", "LPC coefficient precision", offsetof(FlacEncodeContext, options.lpc_coeff_precision), AV_OPT_TYPE_INT, {.i64 = 15 }, 0, MAX_LPC_PRECISION, FLAGS },
1464 { "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" },
1465 { "none", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_NONE }, INT_MIN, INT_MAX, FLAGS, "lpc_type" },
1466 { "fixed", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_FIXED }, INT_MIN, INT_MAX, FLAGS, "lpc_type" },
1467 { "levinson", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_LEVINSON }, INT_MIN, INT_MAX, FLAGS, "lpc_type" },
1468 { "cholesky", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_CHOLESKY }, INT_MIN, INT_MAX, FLAGS, "lpc_type" },
1469 { "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 },
1470 { "min_partition_order", NULL, offsetof(FlacEncodeContext, options.min_partition_order), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, MAX_PARTITION_ORDER, FLAGS },
1471 { "max_partition_order", NULL, offsetof(FlacEncodeContext, options.max_partition_order), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, MAX_PARTITION_ORDER, FLAGS },
1472 { "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" },
1473 { "estimation", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_EST }, INT_MIN, INT_MAX, FLAGS, "predm" },
1474 { "2level", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_2LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" },
1475 { "4level", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_4LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" },
1476 { "8level", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_8LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" },
1477 { "search", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_SEARCH }, INT_MIN, INT_MAX, FLAGS, "predm" },
1478 { "log", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_LOG }, INT_MIN, INT_MAX, FLAGS, "predm" },
1479 { "ch_mode", "Stereo decorrelation mode", offsetof(FlacEncodeContext, options.ch_mode), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, FLAC_CHMODE_MID_SIDE, FLAGS, "ch_mode" },
1480 { "auto", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = -1 }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
1481 { "indep", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_INDEPENDENT }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
1482 { "left_side", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_LEFT_SIDE }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
1483 { "right_side", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_RIGHT_SIDE }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
1484 { "mid_side", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_MID_SIDE }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
1485 { "exact_rice_parameters", "Calculate rice parameters exactly", offsetof(FlacEncodeContext, options.exact_rice_parameters), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
1486 { "multi_dim_quant", "Multi-dimensional quantization", offsetof(FlacEncodeContext, options.multi_dim_quant), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
1487 { "min_prediction_order", NULL, offsetof(FlacEncodeContext, options.min_prediction_order), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, MAX_LPC_ORDER, FLAGS },
1488 { "max_prediction_order", NULL, offsetof(FlacEncodeContext, options.max_prediction_order), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, MAX_LPC_ORDER, FLAGS },
1493 static const AVClass flac_encoder_class = {
1494 .class_name = "FLAC encoder",
1495 .item_name = av_default_item_name,
1497 .version = LIBAVUTIL_VERSION_INT,
1500 AVCodec ff_flac_encoder = {
1502 .long_name = NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"),
1503 .type = AVMEDIA_TYPE_AUDIO,
1504 .id = AV_CODEC_ID_FLAC,
1505 .priv_data_size = sizeof(FlacEncodeContext),
1506 .init = flac_encode_init,
1507 .encode2 = flac_encode_frame,
1508 .close = flac_encode_close,
1509 .capabilities = AV_CODEC_CAP_SMALL_LAST_FRAME | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_LOSSLESS,
1510 .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
1512 AV_SAMPLE_FMT_NONE },
1513 .priv_class = &flac_encoder_class,