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"
38 #define FLAC_SUBFRAME_CONSTANT 0
39 #define FLAC_SUBFRAME_VERBATIM 1
40 #define FLAC_SUBFRAME_FIXED 8
41 #define FLAC_SUBFRAME_LPC 32
43 #define MAX_FIXED_ORDER 4
44 #define MAX_PARTITION_ORDER 8
45 #define MAX_PARTITIONS (1 << MAX_PARTITION_ORDER)
46 #define MAX_LPC_PRECISION 15
47 #define MAX_LPC_SHIFT 15
51 CODING_MODE_RICE2 = 5,
54 typedef struct CompressionOptions {
55 int compression_level;
57 enum FFLPCType lpc_type;
59 int lpc_coeff_precision;
60 int min_prediction_order;
61 int max_prediction_order;
62 int prediction_order_method;
63 int min_partition_order;
64 int max_partition_order;
66 int exact_rice_parameters;
70 typedef struct RiceContext {
71 enum CodingMode coding_mode;
73 int params[MAX_PARTITIONS];
76 typedef struct FlacSubframe {
82 int32_t coefs[MAX_LPC_ORDER];
86 uint32_t rc_udata[FLAC_MAX_BLOCKSIZE];
87 uint64_t rc_sums[32][MAX_PARTITIONS];
89 int32_t samples[FLAC_MAX_BLOCKSIZE];
90 int32_t residual[FLAC_MAX_BLOCKSIZE+11];
93 typedef struct FlacFrame {
94 FlacSubframe subframes[FLAC_MAX_CHANNELS];
102 typedef struct FlacEncodeContext {
112 int max_encoded_framesize;
113 uint32_t frame_count;
114 uint64_t sample_count;
117 CompressionOptions options;
118 AVCodecContext *avctx;
120 struct AVMD5 *md5ctx;
122 unsigned int md5_buffer_size;
123 BswapDSPContext bdsp;
124 FLACDSPContext flac_dsp;
132 * Write streaminfo metadata block to byte array.
134 static void write_streaminfo(FlacEncodeContext *s, uint8_t *header)
138 memset(header, 0, FLAC_STREAMINFO_SIZE);
139 init_put_bits(&pb, header, FLAC_STREAMINFO_SIZE);
141 /* streaminfo metadata block */
142 put_bits(&pb, 16, s->max_blocksize);
143 put_bits(&pb, 16, s->max_blocksize);
144 put_bits(&pb, 24, s->min_framesize);
145 put_bits(&pb, 24, s->max_framesize);
146 put_bits(&pb, 20, s->samplerate);
147 put_bits(&pb, 3, s->channels-1);
148 put_bits(&pb, 5, s->avctx->bits_per_raw_sample - 1);
149 /* write 36-bit sample count in 2 put_bits() calls */
150 put_bits(&pb, 24, (s->sample_count & 0xFFFFFF000LL) >> 12);
151 put_bits(&pb, 12, s->sample_count & 0x000000FFFLL);
153 memcpy(&header[18], s->md5sum, 16);
158 * Set blocksize based on samplerate.
159 * Choose the closest predefined blocksize >= BLOCK_TIME_MS milliseconds.
161 static int select_blocksize(int samplerate, int block_time_ms)
167 av_assert0(samplerate > 0);
168 blocksize = ff_flac_blocksize_table[1];
169 target = (samplerate * block_time_ms) / 1000;
170 for (i = 0; i < 16; i++) {
171 if (target >= ff_flac_blocksize_table[i] &&
172 ff_flac_blocksize_table[i] > blocksize) {
173 blocksize = ff_flac_blocksize_table[i];
180 static av_cold void dprint_compression_options(FlacEncodeContext *s)
182 AVCodecContext *avctx = s->avctx;
183 CompressionOptions *opt = &s->options;
185 av_log(avctx, AV_LOG_DEBUG, " compression: %d\n", opt->compression_level);
187 switch (opt->lpc_type) {
188 case FF_LPC_TYPE_NONE:
189 av_log(avctx, AV_LOG_DEBUG, " lpc type: None\n");
191 case FF_LPC_TYPE_FIXED:
192 av_log(avctx, AV_LOG_DEBUG, " lpc type: Fixed pre-defined coefficients\n");
194 case FF_LPC_TYPE_LEVINSON:
195 av_log(avctx, AV_LOG_DEBUG, " lpc type: Levinson-Durbin recursion with Welch window\n");
197 case FF_LPC_TYPE_CHOLESKY:
198 av_log(avctx, AV_LOG_DEBUG, " lpc type: Cholesky factorization, %d pass%s\n",
199 opt->lpc_passes, opt->lpc_passes == 1 ? "" : "es");
203 av_log(avctx, AV_LOG_DEBUG, " prediction order: %d, %d\n",
204 opt->min_prediction_order, opt->max_prediction_order);
206 switch (opt->prediction_order_method) {
207 case ORDER_METHOD_EST:
208 av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "estimate");
210 case ORDER_METHOD_2LEVEL:
211 av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "2-level");
213 case ORDER_METHOD_4LEVEL:
214 av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "4-level");
216 case ORDER_METHOD_8LEVEL:
217 av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "8-level");
219 case ORDER_METHOD_SEARCH:
220 av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "full search");
222 case ORDER_METHOD_LOG:
223 av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "log search");
228 av_log(avctx, AV_LOG_DEBUG, " partition order: %d, %d\n",
229 opt->min_partition_order, opt->max_partition_order);
231 av_log(avctx, AV_LOG_DEBUG, " block size: %d\n", avctx->frame_size);
233 av_log(avctx, AV_LOG_DEBUG, " lpc precision: %d\n",
234 opt->lpc_coeff_precision);
238 static av_cold int flac_encode_init(AVCodecContext *avctx)
240 int freq = avctx->sample_rate;
241 int channels = avctx->channels;
242 FlacEncodeContext *s = avctx->priv_data;
248 switch (avctx->sample_fmt) {
249 case AV_SAMPLE_FMT_S16:
250 avctx->bits_per_raw_sample = 16;
253 case AV_SAMPLE_FMT_S32:
254 if (avctx->bits_per_raw_sample != 24)
255 av_log(avctx, AV_LOG_WARNING, "encoding as 24 bits-per-sample\n");
256 avctx->bits_per_raw_sample = 24;
261 if (channels < 1 || channels > FLAC_MAX_CHANNELS) {
262 av_log(avctx, AV_LOG_ERROR, "%d channels not supported (max %d)\n",
263 channels, FLAC_MAX_CHANNELS);
264 return AVERROR(EINVAL);
266 s->channels = channels;
268 /* find samplerate in table */
271 for (i = 4; i < 12; i++) {
272 if (freq == ff_flac_sample_rate_table[i]) {
273 s->samplerate = ff_flac_sample_rate_table[i];
279 /* if not in table, samplerate is non-standard */
281 if (freq % 1000 == 0 && freq < 255000) {
283 s->sr_code[1] = freq / 1000;
284 } else if (freq % 10 == 0 && freq < 655350) {
286 s->sr_code[1] = freq / 10;
287 } else if (freq < 65535) {
289 s->sr_code[1] = freq;
291 av_log(avctx, AV_LOG_ERROR, "%d Hz not supported\n", freq);
292 return AVERROR(EINVAL);
294 s->samplerate = freq;
297 /* set compression option defaults based on avctx->compression_level */
298 if (avctx->compression_level < 0)
299 s->options.compression_level = 5;
301 s->options.compression_level = avctx->compression_level;
303 level = s->options.compression_level;
305 av_log(avctx, AV_LOG_ERROR, "invalid compression level: %d\n",
306 s->options.compression_level);
307 return AVERROR(EINVAL);
310 s->options.block_time_ms = ((int[]){ 27, 27, 27,105,105,105,105,105,105,105,105,105,105})[level];
312 if (s->options.lpc_type == FF_LPC_TYPE_DEFAULT)
313 s->options.lpc_type = ((int[]){ FF_LPC_TYPE_FIXED, FF_LPC_TYPE_FIXED, FF_LPC_TYPE_FIXED,
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, FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON,
317 FF_LPC_TYPE_LEVINSON})[level];
319 if (s->options.min_prediction_order < 0)
320 s->options.min_prediction_order = ((int[]){ 2, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1})[level];
321 if (s->options.max_prediction_order < 0)
322 s->options.max_prediction_order = ((int[]){ 3, 4, 4, 6, 8, 8, 8, 8, 12, 12, 12, 32, 32})[level];
324 if (s->options.prediction_order_method < 0)
325 s->options.prediction_order_method = ((int[]){ ORDER_METHOD_EST, ORDER_METHOD_EST, ORDER_METHOD_EST,
326 ORDER_METHOD_EST, ORDER_METHOD_EST, ORDER_METHOD_EST,
327 ORDER_METHOD_4LEVEL, ORDER_METHOD_LOG, ORDER_METHOD_4LEVEL,
328 ORDER_METHOD_LOG, ORDER_METHOD_SEARCH, ORDER_METHOD_LOG,
329 ORDER_METHOD_SEARCH})[level];
331 if (s->options.min_partition_order > s->options.max_partition_order) {
332 av_log(avctx, AV_LOG_ERROR, "invalid partition orders: min=%d max=%d\n",
333 s->options.min_partition_order, s->options.max_partition_order);
334 return AVERROR(EINVAL);
336 if (s->options.min_partition_order < 0)
337 s->options.min_partition_order = ((int[]){ 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0})[level];
338 if (s->options.max_partition_order < 0)
339 s->options.max_partition_order = ((int[]){ 2, 2, 3, 3, 3, 8, 8, 8, 8, 8, 8, 8, 8})[level];
341 #if FF_API_PRIVATE_OPT
342 FF_DISABLE_DEPRECATION_WARNINGS
343 if (avctx->min_prediction_order >= 0) {
344 if (s->options.lpc_type == FF_LPC_TYPE_FIXED) {
345 if (avctx->min_prediction_order > MAX_FIXED_ORDER) {
346 av_log(avctx, AV_LOG_WARNING,
347 "invalid min prediction order %d, clamped to %d\n",
348 avctx->min_prediction_order, MAX_FIXED_ORDER);
349 avctx->min_prediction_order = MAX_FIXED_ORDER;
351 } else if (avctx->min_prediction_order < MIN_LPC_ORDER ||
352 avctx->min_prediction_order > MAX_LPC_ORDER) {
353 av_log(avctx, AV_LOG_ERROR, "invalid min prediction order: %d\n",
354 avctx->min_prediction_order);
355 return AVERROR(EINVAL);
357 s->options.min_prediction_order = avctx->min_prediction_order;
359 if (avctx->max_prediction_order >= 0) {
360 if (s->options.lpc_type == FF_LPC_TYPE_FIXED) {
361 if (avctx->max_prediction_order > MAX_FIXED_ORDER) {
362 av_log(avctx, AV_LOG_WARNING,
363 "invalid max prediction order %d, clamped to %d\n",
364 avctx->max_prediction_order, MAX_FIXED_ORDER);
365 avctx->max_prediction_order = MAX_FIXED_ORDER;
367 } else if (avctx->max_prediction_order < MIN_LPC_ORDER ||
368 avctx->max_prediction_order > MAX_LPC_ORDER) {
369 av_log(avctx, AV_LOG_ERROR, "invalid max prediction order: %d\n",
370 avctx->max_prediction_order);
371 return AVERROR(EINVAL);
373 s->options.max_prediction_order = avctx->max_prediction_order;
375 FF_ENABLE_DEPRECATION_WARNINGS
377 if (s->options.lpc_type == FF_LPC_TYPE_NONE) {
378 s->options.min_prediction_order = 0;
379 s->options.max_prediction_order = 0;
380 } else if (s->options.lpc_type == FF_LPC_TYPE_FIXED) {
381 if (s->options.min_prediction_order > MAX_FIXED_ORDER) {
382 av_log(avctx, AV_LOG_WARNING,
383 "invalid min prediction order %d, clamped to %d\n",
384 s->options.min_prediction_order, MAX_FIXED_ORDER);
385 s->options.min_prediction_order = MAX_FIXED_ORDER;
387 if (s->options.max_prediction_order > MAX_FIXED_ORDER) {
388 av_log(avctx, AV_LOG_WARNING,
389 "invalid max prediction order %d, clamped to %d\n",
390 s->options.max_prediction_order, MAX_FIXED_ORDER);
391 s->options.max_prediction_order = MAX_FIXED_ORDER;
395 if (s->options.max_prediction_order < s->options.min_prediction_order) {
396 av_log(avctx, AV_LOG_ERROR, "invalid prediction orders: min=%d max=%d\n",
397 s->options.min_prediction_order, s->options.max_prediction_order);
398 return AVERROR(EINVAL);
401 if (avctx->frame_size > 0) {
402 if (avctx->frame_size < FLAC_MIN_BLOCKSIZE ||
403 avctx->frame_size > FLAC_MAX_BLOCKSIZE) {
404 av_log(avctx, AV_LOG_ERROR, "invalid block size: %d\n",
406 return AVERROR(EINVAL);
409 s->avctx->frame_size = select_blocksize(s->samplerate, s->options.block_time_ms);
411 s->max_blocksize = s->avctx->frame_size;
413 /* set maximum encoded frame size in verbatim mode */
414 s->max_framesize = ff_flac_get_max_frame_size(s->avctx->frame_size,
416 s->avctx->bits_per_raw_sample);
418 /* initialize MD5 context */
419 s->md5ctx = av_md5_alloc();
421 return AVERROR(ENOMEM);
422 av_md5_init(s->md5ctx);
424 streaminfo = av_malloc(FLAC_STREAMINFO_SIZE);
426 return AVERROR(ENOMEM);
427 write_streaminfo(s, streaminfo);
428 avctx->extradata = streaminfo;
429 avctx->extradata_size = FLAC_STREAMINFO_SIZE;
432 s->min_framesize = s->max_framesize;
435 avctx->channel_layout != (AV_CH_LAYOUT_STEREO|AV_CH_FRONT_CENTER) ||
437 avctx->channel_layout != AV_CH_LAYOUT_2_2 &&
438 avctx->channel_layout != AV_CH_LAYOUT_QUAD ||
440 avctx->channel_layout != AV_CH_LAYOUT_5POINT0 &&
441 avctx->channel_layout != AV_CH_LAYOUT_5POINT0_BACK ||
443 avctx->channel_layout != AV_CH_LAYOUT_5POINT1 &&
444 avctx->channel_layout != AV_CH_LAYOUT_5POINT1_BACK) {
445 if (avctx->channel_layout) {
446 av_log(avctx, AV_LOG_ERROR, "Channel layout not supported by Flac, "
447 "output stream will have incorrect "
448 "channel layout.\n");
450 av_log(avctx, AV_LOG_WARNING, "No channel layout specified. The encoder "
451 "will use Flac channel layout for "
452 "%d channels.\n", channels);
456 ret = ff_lpc_init(&s->lpc_ctx, avctx->frame_size,
457 s->options.max_prediction_order, FF_LPC_TYPE_LEVINSON);
459 ff_bswapdsp_init(&s->bdsp);
460 ff_flacdsp_init(&s->flac_dsp, avctx->sample_fmt, channels,
461 avctx->bits_per_raw_sample);
463 dprint_compression_options(s);
469 static void init_frame(FlacEncodeContext *s, int nb_samples)
476 for (i = 0; i < 16; i++) {
477 if (nb_samples == ff_flac_blocksize_table[i]) {
478 frame->blocksize = ff_flac_blocksize_table[i];
479 frame->bs_code[0] = i;
480 frame->bs_code[1] = 0;
485 frame->blocksize = nb_samples;
486 if (frame->blocksize <= 256) {
487 frame->bs_code[0] = 6;
488 frame->bs_code[1] = frame->blocksize-1;
490 frame->bs_code[0] = 7;
491 frame->bs_code[1] = frame->blocksize-1;
495 for (ch = 0; ch < s->channels; ch++) {
496 FlacSubframe *sub = &frame->subframes[ch];
499 sub->obits = s->avctx->bits_per_raw_sample;
502 sub->rc.coding_mode = CODING_MODE_RICE2;
504 sub->rc.coding_mode = CODING_MODE_RICE;
507 frame->verbatim_only = 0;
512 * Copy channel-interleaved input samples into separate subframes.
514 static void copy_samples(FlacEncodeContext *s, const void *samples)
518 int shift = av_get_bytes_per_sample(s->avctx->sample_fmt) * 8 -
519 s->avctx->bits_per_raw_sample;
521 #define COPY_SAMPLES(bits) do { \
522 const int ## bits ## _t *samples0 = samples; \
524 for (i = 0, j = 0; i < frame->blocksize; i++) \
525 for (ch = 0; ch < s->channels; ch++, j++) \
526 frame->subframes[ch].samples[i] = samples0[j] >> shift; \
529 if (s->avctx->sample_fmt == AV_SAMPLE_FMT_S16)
536 static uint64_t rice_count_exact(const int32_t *res, int n, int k)
541 for (i = 0; i < n; i++) {
542 int32_t v = -2 * res[i] - 1;
544 count += (v >> k) + 1 + k;
550 static uint64_t subframe_count_exact(FlacEncodeContext *s, FlacSubframe *sub,
553 int p, porder, psize;
557 /* subframe header */
561 count += sub->wasted;
564 if (sub->type == FLAC_SUBFRAME_CONSTANT) {
566 } else if (sub->type == FLAC_SUBFRAME_VERBATIM) {
567 count += s->frame.blocksize * sub->obits;
569 /* warm-up samples */
570 count += pred_order * sub->obits;
572 /* LPC coefficients */
573 if (sub->type == FLAC_SUBFRAME_LPC)
574 count += 4 + 5 + pred_order * s->options.lpc_coeff_precision;
576 /* rice-encoded block */
579 /* partition order */
580 porder = sub->rc.porder;
581 psize = s->frame.blocksize >> porder;
587 for (p = 0; p < 1 << porder; p++) {
588 int k = sub->rc.params[p];
589 count += sub->rc.coding_mode;
590 count += rice_count_exact(&sub->residual[i], part_end - i, k);
592 part_end = FFMIN(s->frame.blocksize, part_end + psize);
600 #define rice_encode_count(sum, n, k) (((n)*((k)+1))+((sum-(n>>1))>>(k)))
603 * Solve for d/dk(rice_encode_count) = n-((sum-(n>>1))>>(k+1)) = 0.
605 static int find_optimal_param(uint64_t sum, int n, int max_param)
612 sum2 = sum - (n >> 1);
613 k = av_log2(av_clipl_int32(sum2 / n));
614 return FFMIN(k, max_param);
617 static int find_optimal_param_exact(uint64_t sums[32][MAX_PARTITIONS], int i, int max_param)
620 int64_t bestbits = INT64_MAX;
623 for (k = 0; k <= max_param; k++) {
624 int64_t bits = sums[k][i];
625 if (bits < bestbits) {
634 static uint64_t calc_optimal_rice_params(RiceContext *rc, int porder,
635 uint64_t sums[32][MAX_PARTITIONS],
636 int n, int pred_order, int max_param, int exact)
642 part = (1 << porder);
645 cnt = (n >> porder) - pred_order;
646 for (i = 0; i < part; i++) {
648 k = find_optimal_param_exact(sums, i, max_param);
649 all_bits += sums[k][i];
651 k = find_optimal_param(sums[0][i], cnt, max_param);
652 all_bits += rice_encode_count(sums[0][i], cnt, k);
664 static void calc_sum_top(int pmax, int kmax, const uint32_t *data, int n, int pred_order,
665 uint64_t sums[32][MAX_PARTITIONS])
669 const uint32_t *res, *res_end;
671 /* sums for highest level */
674 for (k = 0; k <= kmax; k++) {
675 res = &data[pred_order];
676 res_end = &data[n >> pmax];
677 for (i = 0; i < parts; i++) {
679 uint64_t sum = (1LL + k) * (res_end - res);
680 while (res < res_end)
681 sum += *(res++) >> k;
685 while (res < res_end)
689 res_end += n >> pmax;
694 static void calc_sum_next(int level, uint64_t sums[32][MAX_PARTITIONS], int kmax)
697 int parts = (1 << level);
698 for (i = 0; i < parts; i++) {
699 for (k=0; k<=kmax; k++)
700 sums[k][i] = sums[k][2*i] + sums[k][2*i+1];
704 static uint64_t calc_rice_params(RiceContext *rc,
705 uint32_t udata[FLAC_MAX_BLOCKSIZE],
706 uint64_t sums[32][MAX_PARTITIONS],
708 const int32_t *data, int n, int pred_order, int exact)
711 uint64_t bits[MAX_PARTITION_ORDER+1];
714 int kmax = (1 << rc->coding_mode) - 2;
716 av_assert1(pmin >= 0 && pmin <= MAX_PARTITION_ORDER);
717 av_assert1(pmax >= 0 && pmax <= MAX_PARTITION_ORDER);
718 av_assert1(pmin <= pmax);
720 tmp_rc.coding_mode = rc->coding_mode;
722 for (i = 0; i < n; i++)
723 udata[i] = (2 * data[i]) ^ (data[i] >> 31);
725 calc_sum_top(pmax, exact ? kmax : 0, udata, n, pred_order, sums);
728 bits[pmin] = UINT32_MAX;
730 bits[i] = calc_optimal_rice_params(&tmp_rc, i, sums, n, pred_order, kmax, exact);
731 if (bits[i] < bits[opt_porder] || pmax == pmin) {
737 calc_sum_next(--i, sums, exact ? kmax : 0);
740 return bits[opt_porder];
744 static int get_max_p_order(int max_porder, int n, int order)
746 int porder = FFMIN(max_porder, av_log2(n^(n-1)));
748 porder = FFMIN(porder, av_log2(n/order));
753 static uint64_t find_subframe_rice_params(FlacEncodeContext *s,
754 FlacSubframe *sub, int pred_order)
756 int pmin = get_max_p_order(s->options.min_partition_order,
757 s->frame.blocksize, pred_order);
758 int pmax = get_max_p_order(s->options.max_partition_order,
759 s->frame.blocksize, pred_order);
761 uint64_t bits = 8 + pred_order * sub->obits + 2 + sub->rc.coding_mode;
762 if (sub->type == FLAC_SUBFRAME_LPC)
763 bits += 4 + 5 + pred_order * s->options.lpc_coeff_precision;
764 bits += calc_rice_params(&sub->rc, sub->rc_udata, sub->rc_sums, pmin, pmax, sub->residual,
765 s->frame.blocksize, pred_order, s->options.exact_rice_parameters);
770 static void encode_residual_fixed(int32_t *res, const int32_t *smp, int n,
775 for (i = 0; i < order; i++)
779 for (i = order; i < n; i++)
781 } else if (order == 1) {
782 for (i = order; i < n; i++)
783 res[i] = smp[i] - smp[i-1];
784 } else if (order == 2) {
785 int a = smp[order-1] - smp[order-2];
786 for (i = order; i < n; i += 2) {
787 int b = smp[i ] - smp[i-1];
789 a = smp[i+1] - smp[i ];
792 } else if (order == 3) {
793 int a = smp[order-1] - smp[order-2];
794 int c = smp[order-1] - 2*smp[order-2] + smp[order-3];
795 for (i = order; i < n; i += 2) {
796 int b = smp[i ] - smp[i-1];
799 a = smp[i+1] - smp[i ];
804 int a = smp[order-1] - smp[order-2];
805 int c = smp[order-1] - 2*smp[order-2] + smp[order-3];
806 int e = smp[order-1] - 3*smp[order-2] + 3*smp[order-3] - smp[order-4];
807 for (i = order; i < n; i += 2) {
808 int b = smp[i ] - smp[i-1];
812 a = smp[i+1] - smp[i ];
821 static int encode_residual_ch(FlacEncodeContext *s, int ch)
824 int min_order, max_order, opt_order, omethod;
827 int32_t coefs[MAX_LPC_ORDER][MAX_LPC_ORDER];
828 int shift[MAX_LPC_ORDER];
832 sub = &frame->subframes[ch];
835 n = frame->blocksize;
838 for (i = 1; i < n; i++)
842 sub->type = sub->type_code = FLAC_SUBFRAME_CONSTANT;
844 return subframe_count_exact(s, sub, 0);
848 if (frame->verbatim_only || n < 5) {
849 sub->type = sub->type_code = FLAC_SUBFRAME_VERBATIM;
850 memcpy(res, smp, n * sizeof(int32_t));
851 return subframe_count_exact(s, sub, 0);
854 min_order = s->options.min_prediction_order;
855 max_order = s->options.max_prediction_order;
856 omethod = s->options.prediction_order_method;
859 sub->type = FLAC_SUBFRAME_FIXED;
860 if (s->options.lpc_type == FF_LPC_TYPE_NONE ||
861 s->options.lpc_type == FF_LPC_TYPE_FIXED || n <= max_order) {
862 uint64_t bits[MAX_FIXED_ORDER+1];
863 if (max_order > MAX_FIXED_ORDER)
864 max_order = MAX_FIXED_ORDER;
866 bits[0] = UINT32_MAX;
867 for (i = min_order; i <= max_order; i++) {
868 encode_residual_fixed(res, smp, n, i);
869 bits[i] = find_subframe_rice_params(s, sub, i);
870 if (bits[i] < bits[opt_order])
873 sub->order = opt_order;
874 sub->type_code = sub->type | sub->order;
875 if (sub->order != max_order) {
876 encode_residual_fixed(res, smp, n, sub->order);
877 find_subframe_rice_params(s, sub, sub->order);
879 return subframe_count_exact(s, sub, sub->order);
883 sub->type = FLAC_SUBFRAME_LPC;
884 opt_order = ff_lpc_calc_coefs(&s->lpc_ctx, smp, n, min_order, max_order,
885 s->options.lpc_coeff_precision, coefs, shift, s->options.lpc_type,
886 s->options.lpc_passes, omethod,
889 if (omethod == ORDER_METHOD_2LEVEL ||
890 omethod == ORDER_METHOD_4LEVEL ||
891 omethod == ORDER_METHOD_8LEVEL) {
892 int levels = 1 << omethod;
893 uint64_t bits[1 << ORDER_METHOD_8LEVEL];
895 int opt_index = levels-1;
896 opt_order = max_order-1;
897 bits[opt_index] = UINT32_MAX;
898 for (i = levels-1; i >= 0; i--) {
899 int last_order = order;
900 order = min_order + (((max_order-min_order+1) * (i+1)) / levels)-1;
901 order = av_clip(order, min_order - 1, max_order - 1);
902 if (order == last_order)
904 if (s->bps_code * 4 + s->options.lpc_coeff_precision + av_log2(order) <= 32) {
905 s->flac_dsp.lpc16_encode(res, smp, n, order+1, coefs[order],
908 s->flac_dsp.lpc32_encode(res, smp, n, order+1, coefs[order],
911 bits[i] = find_subframe_rice_params(s, sub, order+1);
912 if (bits[i] < bits[opt_index]) {
918 } else if (omethod == ORDER_METHOD_SEARCH) {
919 // brute-force optimal order search
920 uint64_t bits[MAX_LPC_ORDER];
922 bits[0] = UINT32_MAX;
923 for (i = min_order-1; i < max_order; i++) {
924 if (s->bps_code * 4 + s->options.lpc_coeff_precision + av_log2(i) <= 32) {
925 s->flac_dsp.lpc16_encode(res, smp, n, i+1, coefs[i], shift[i]);
927 s->flac_dsp.lpc32_encode(res, smp, n, i+1, coefs[i], shift[i]);
929 bits[i] = find_subframe_rice_params(s, sub, i+1);
930 if (bits[i] < bits[opt_order])
934 } else if (omethod == ORDER_METHOD_LOG) {
935 uint64_t bits[MAX_LPC_ORDER];
938 opt_order = min_order - 1 + (max_order-min_order)/3;
939 memset(bits, -1, sizeof(bits));
941 for (step = 16; step; step >>= 1) {
942 int last = opt_order;
943 for (i = last-step; i <= last+step; i += step) {
944 if (i < min_order-1 || i >= max_order || bits[i] < UINT32_MAX)
946 if (s->bps_code * 4 + s->options.lpc_coeff_precision + av_log2(i) <= 32) {
947 s->flac_dsp.lpc32_encode(res, smp, n, i+1, coefs[i], shift[i]);
949 s->flac_dsp.lpc16_encode(res, smp, n, i+1, coefs[i], shift[i]);
951 bits[i] = find_subframe_rice_params(s, sub, i+1);
952 if (bits[i] < bits[opt_order])
959 if (s->options.multi_dim_quant) {
961 int i, step, improved;
962 int64_t best_score = INT64_MAX;
965 qmax = (1 << (s->options.lpc_coeff_precision - 1)) - 1;
967 for (i=0; i<opt_order; i++)
972 for (step = 0; step < allsteps; step++) {
974 int32_t lpc_try[MAX_LPC_ORDER];
978 for (i=0; i<opt_order; i++) {
979 int diff = ((tmp + 1) % 3) - 1;
980 lpc_try[i] = av_clip(coefs[opt_order - 1][i] + diff, -qmax, qmax);
987 if (s->bps_code * 4 + s->options.lpc_coeff_precision + av_log2(opt_order - 1) <= 32) {
988 s->flac_dsp.lpc16_encode(res, smp, n, opt_order, lpc_try, shift[opt_order-1]);
990 s->flac_dsp.lpc32_encode(res, smp, n, opt_order, lpc_try, shift[opt_order-1]);
992 score = find_subframe_rice_params(s, sub, opt_order);
993 if (score < best_score) {
995 memcpy(coefs[opt_order-1], lpc_try, sizeof(*coefs));
1002 sub->order = opt_order;
1003 sub->type_code = sub->type | (sub->order-1);
1004 sub->shift = shift[sub->order-1];
1005 for (i = 0; i < sub->order; i++)
1006 sub->coefs[i] = coefs[sub->order-1][i];
1008 if (s->bps_code * 4 + s->options.lpc_coeff_precision + av_log2(opt_order) <= 32) {
1009 s->flac_dsp.lpc16_encode(res, smp, n, sub->order, sub->coefs, sub->shift);
1011 s->flac_dsp.lpc32_encode(res, smp, n, sub->order, sub->coefs, sub->shift);
1014 find_subframe_rice_params(s, sub, sub->order);
1016 return subframe_count_exact(s, sub, sub->order);
1020 static int count_frame_header(FlacEncodeContext *s)
1022 uint8_t av_unused tmp;
1028 <1> Blocking strategy
1029 <4> Block size in inter-channel samples
1031 <4> Channel assignment
1032 <3> Sample size in bits
1037 /* coded frame number */
1038 PUT_UTF8(s->frame_count, tmp, count += 8;)
1040 /* explicit block size */
1041 if (s->frame.bs_code[0] == 6)
1043 else if (s->frame.bs_code[0] == 7)
1046 /* explicit sample rate */
1047 count += ((s->sr_code[0] == 12) + (s->sr_code[0] > 12) * 2) * 8;
1049 /* frame header CRC-8 */
1056 static int encode_frame(FlacEncodeContext *s)
1061 count = count_frame_header(s);
1063 for (ch = 0; ch < s->channels; ch++)
1064 count += encode_residual_ch(s, ch);
1066 count += (8 - (count & 7)) & 7; // byte alignment
1067 count += 16; // CRC-16
1070 if (count > INT_MAX)
1076 static void remove_wasted_bits(FlacEncodeContext *s)
1080 for (ch = 0; ch < s->channels; ch++) {
1081 FlacSubframe *sub = &s->frame.subframes[ch];
1084 for (i = 0; i < s->frame.blocksize; i++) {
1085 v |= sub->samples[i];
1090 if (v && !(v & 1)) {
1093 for (i = 0; i < s->frame.blocksize; i++)
1094 sub->samples[i] >>= v;
1099 /* for 24-bit, check if removing wasted bits makes the range better
1100 suited for using RICE instead of RICE2 for entropy coding */
1101 if (sub->obits <= 17)
1102 sub->rc.coding_mode = CODING_MODE_RICE;
1108 static int estimate_stereo_mode(const int32_t *left_ch, const int32_t *right_ch, int n,
1117 /* calculate sum of 2nd order residual for each channel */
1118 sum[0] = sum[1] = sum[2] = sum[3] = 0;
1119 for (i = 2; i < n; i++) {
1120 lt = left_ch[i] - 2*left_ch[i-1] + left_ch[i-2];
1121 rt = right_ch[i] - 2*right_ch[i-1] + right_ch[i-2];
1122 sum[2] += FFABS((lt + rt) >> 1);
1123 sum[3] += FFABS(lt - rt);
1124 sum[0] += FFABS(lt);
1125 sum[1] += FFABS(rt);
1127 /* estimate bit counts */
1128 for (i = 0; i < 4; i++) {
1129 k = find_optimal_param(2 * sum[i], n, max_rice_param);
1130 sum[i] = rice_encode_count( 2 * sum[i], n, k);
1133 /* calculate score for each mode */
1134 score[0] = sum[0] + sum[1];
1135 score[1] = sum[0] + sum[3];
1136 score[2] = sum[1] + sum[3];
1137 score[3] = sum[2] + sum[3];
1139 /* return mode with lowest score */
1141 for (i = 1; i < 4; i++)
1142 if (score[i] < score[best])
1150 * Perform stereo channel decorrelation.
1152 static void channel_decorrelation(FlacEncodeContext *s)
1155 int32_t *left, *right;
1159 n = frame->blocksize;
1160 left = frame->subframes[0].samples;
1161 right = frame->subframes[1].samples;
1163 if (s->channels != 2) {
1164 frame->ch_mode = FLAC_CHMODE_INDEPENDENT;
1168 if (s->options.ch_mode < 0) {
1169 int max_rice_param = (1 << frame->subframes[0].rc.coding_mode) - 2;
1170 frame->ch_mode = estimate_stereo_mode(left, right, n, max_rice_param);
1172 frame->ch_mode = s->options.ch_mode;
1174 /* perform decorrelation and adjust bits-per-sample */
1175 if (frame->ch_mode == FLAC_CHMODE_INDEPENDENT)
1177 if (frame->ch_mode == FLAC_CHMODE_MID_SIDE) {
1179 for (i = 0; i < n; i++) {
1181 left[i] = (tmp + right[i]) >> 1;
1182 right[i] = tmp - right[i];
1184 frame->subframes[1].obits++;
1185 } else if (frame->ch_mode == FLAC_CHMODE_LEFT_SIDE) {
1186 for (i = 0; i < n; i++)
1187 right[i] = left[i] - right[i];
1188 frame->subframes[1].obits++;
1190 for (i = 0; i < n; i++)
1191 left[i] -= right[i];
1192 frame->subframes[0].obits++;
1197 static void write_utf8(PutBitContext *pb, uint32_t val)
1200 PUT_UTF8(val, tmp, put_bits(pb, 8, tmp);)
1204 static void write_frame_header(FlacEncodeContext *s)
1211 put_bits(&s->pb, 16, 0xFFF8);
1212 put_bits(&s->pb, 4, frame->bs_code[0]);
1213 put_bits(&s->pb, 4, s->sr_code[0]);
1215 if (frame->ch_mode == FLAC_CHMODE_INDEPENDENT)
1216 put_bits(&s->pb, 4, s->channels-1);
1218 put_bits(&s->pb, 4, frame->ch_mode + FLAC_MAX_CHANNELS - 1);
1220 put_bits(&s->pb, 3, s->bps_code);
1221 put_bits(&s->pb, 1, 0);
1222 write_utf8(&s->pb, s->frame_count);
1224 if (frame->bs_code[0] == 6)
1225 put_bits(&s->pb, 8, frame->bs_code[1]);
1226 else if (frame->bs_code[0] == 7)
1227 put_bits(&s->pb, 16, frame->bs_code[1]);
1229 if (s->sr_code[0] == 12)
1230 put_bits(&s->pb, 8, s->sr_code[1]);
1231 else if (s->sr_code[0] > 12)
1232 put_bits(&s->pb, 16, s->sr_code[1]);
1234 flush_put_bits(&s->pb);
1235 crc = av_crc(av_crc_get_table(AV_CRC_8_ATM), 0, s->pb.buf,
1236 put_bits_count(&s->pb) >> 3);
1237 put_bits(&s->pb, 8, crc);
1241 static void write_subframes(FlacEncodeContext *s)
1245 for (ch = 0; ch < s->channels; ch++) {
1246 FlacSubframe *sub = &s->frame.subframes[ch];
1247 int i, p, porder, psize;
1249 int32_t *res = sub->residual;
1250 int32_t *frame_end = &sub->residual[s->frame.blocksize];
1252 /* subframe header */
1253 put_bits(&s->pb, 1, 0);
1254 put_bits(&s->pb, 6, sub->type_code);
1255 put_bits(&s->pb, 1, !!sub->wasted);
1257 put_bits(&s->pb, sub->wasted, 1);
1260 if (sub->type == FLAC_SUBFRAME_CONSTANT) {
1261 put_sbits(&s->pb, sub->obits, res[0]);
1262 } else if (sub->type == FLAC_SUBFRAME_VERBATIM) {
1263 while (res < frame_end)
1264 put_sbits(&s->pb, sub->obits, *res++);
1266 /* warm-up samples */
1267 for (i = 0; i < sub->order; i++)
1268 put_sbits(&s->pb, sub->obits, *res++);
1270 /* LPC coefficients */
1271 if (sub->type == FLAC_SUBFRAME_LPC) {
1272 int cbits = s->options.lpc_coeff_precision;
1273 put_bits( &s->pb, 4, cbits-1);
1274 put_sbits(&s->pb, 5, sub->shift);
1275 for (i = 0; i < sub->order; i++)
1276 put_sbits(&s->pb, cbits, sub->coefs[i]);
1279 /* rice-encoded block */
1280 put_bits(&s->pb, 2, sub->rc.coding_mode - 4);
1282 /* partition order */
1283 porder = sub->rc.porder;
1284 psize = s->frame.blocksize >> porder;
1285 put_bits(&s->pb, 4, porder);
1288 part_end = &sub->residual[psize];
1289 for (p = 0; p < 1 << porder; p++) {
1290 int k = sub->rc.params[p];
1291 put_bits(&s->pb, sub->rc.coding_mode, k);
1292 while (res < part_end)
1293 set_sr_golomb_flac(&s->pb, *res++, k, INT32_MAX, 0);
1294 part_end = FFMIN(frame_end, part_end + psize);
1301 static void write_frame_footer(FlacEncodeContext *s)
1304 flush_put_bits(&s->pb);
1305 crc = av_bswap16(av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0, s->pb.buf,
1306 put_bits_count(&s->pb)>>3));
1307 put_bits(&s->pb, 16, crc);
1308 flush_put_bits(&s->pb);
1312 static int write_frame(FlacEncodeContext *s, AVPacket *avpkt)
1314 init_put_bits(&s->pb, avpkt->data, avpkt->size);
1315 write_frame_header(s);
1317 write_frame_footer(s);
1318 return put_bits_count(&s->pb) >> 3;
1322 static int update_md5_sum(FlacEncodeContext *s, const void *samples)
1325 int buf_size = s->frame.blocksize * s->channels *
1326 ((s->avctx->bits_per_raw_sample + 7) / 8);
1328 if (s->avctx->bits_per_raw_sample > 16 || HAVE_BIGENDIAN) {
1329 av_fast_malloc(&s->md5_buffer, &s->md5_buffer_size, buf_size);
1331 return AVERROR(ENOMEM);
1334 if (s->avctx->bits_per_raw_sample <= 16) {
1335 buf = (const uint8_t *)samples;
1337 s->bdsp.bswap16_buf((uint16_t *) s->md5_buffer,
1338 (const uint16_t *) samples, buf_size / 2);
1339 buf = s->md5_buffer;
1343 const int32_t *samples0 = samples;
1344 uint8_t *tmp = s->md5_buffer;
1346 for (i = 0; i < s->frame.blocksize * s->channels; i++) {
1347 int32_t v = samples0[i] >> 8;
1348 AV_WL24(tmp + 3*i, v);
1350 buf = s->md5_buffer;
1352 av_md5_update(s->md5ctx, buf, buf_size);
1358 static int flac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
1359 const AVFrame *frame, int *got_packet_ptr)
1361 FlacEncodeContext *s;
1362 int frame_bytes, out_bytes, ret;
1364 s = avctx->priv_data;
1366 /* when the last block is reached, update the header in extradata */
1368 s->max_framesize = s->max_encoded_framesize;
1369 av_md5_final(s->md5ctx, s->md5sum);
1370 write_streaminfo(s, avctx->extradata);
1372 #if FF_API_SIDEDATA_ONLY_PKT
1373 FF_DISABLE_DEPRECATION_WARNINGS
1374 if (avctx->side_data_only_packets && !s->flushed) {
1375 FF_ENABLE_DEPRECATION_WARNINGS
1379 uint8_t *side_data = av_packet_new_side_data(avpkt, AV_PKT_DATA_NEW_EXTRADATA,
1380 avctx->extradata_size);
1382 return AVERROR(ENOMEM);
1383 memcpy(side_data, avctx->extradata, avctx->extradata_size);
1385 avpkt->pts = s->next_pts;
1387 *got_packet_ptr = 1;
1394 /* change max_framesize for small final frame */
1395 if (frame->nb_samples < s->frame.blocksize) {
1396 s->max_framesize = ff_flac_get_max_frame_size(frame->nb_samples,
1398 avctx->bits_per_raw_sample);
1401 init_frame(s, frame->nb_samples);
1403 copy_samples(s, frame->data[0]);
1405 channel_decorrelation(s);
1407 remove_wasted_bits(s);
1409 frame_bytes = encode_frame(s);
1411 /* Fall back on verbatim mode if the compressed frame is larger than it
1412 would be if encoded uncompressed. */
1413 if (frame_bytes < 0 || frame_bytes > s->max_framesize) {
1414 s->frame.verbatim_only = 1;
1415 frame_bytes = encode_frame(s);
1416 if (frame_bytes < 0) {
1417 av_log(avctx, AV_LOG_ERROR, "Bad frame count\n");
1422 if ((ret = ff_alloc_packet2(avctx, avpkt, frame_bytes, 0)) < 0)
1425 out_bytes = write_frame(s, avpkt);
1428 s->sample_count += frame->nb_samples;
1429 if ((ret = update_md5_sum(s, frame->data[0])) < 0) {
1430 av_log(avctx, AV_LOG_ERROR, "Error updating MD5 checksum\n");
1433 if (out_bytes > s->max_encoded_framesize)
1434 s->max_encoded_framesize = out_bytes;
1435 if (out_bytes < s->min_framesize)
1436 s->min_framesize = out_bytes;
1438 avpkt->pts = frame->pts;
1439 avpkt->duration = ff_samples_to_time_base(avctx, frame->nb_samples);
1440 avpkt->size = out_bytes;
1442 s->next_pts = avpkt->pts + avpkt->duration;
1444 *got_packet_ptr = 1;
1449 static av_cold int flac_encode_close(AVCodecContext *avctx)
1451 if (avctx->priv_data) {
1452 FlacEncodeContext *s = avctx->priv_data;
1453 av_freep(&s->md5ctx);
1454 av_freep(&s->md5_buffer);
1455 ff_lpc_end(&s->lpc_ctx);
1457 av_freep(&avctx->extradata);
1458 avctx->extradata_size = 0;
1462 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM
1463 static const AVOption options[] = {
1464 { "lpc_coeff_precision", "LPC coefficient precision", offsetof(FlacEncodeContext, options.lpc_coeff_precision), AV_OPT_TYPE_INT, {.i64 = 15 }, 0, MAX_LPC_PRECISION, FLAGS },
1465 { "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" },
1466 { "none", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_NONE }, INT_MIN, INT_MAX, FLAGS, "lpc_type" },
1467 { "fixed", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_FIXED }, INT_MIN, INT_MAX, FLAGS, "lpc_type" },
1468 { "levinson", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_LEVINSON }, INT_MIN, INT_MAX, FLAGS, "lpc_type" },
1469 { "cholesky", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_CHOLESKY }, INT_MIN, INT_MAX, FLAGS, "lpc_type" },
1470 { "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 },
1471 { "min_partition_order", NULL, offsetof(FlacEncodeContext, options.min_partition_order), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, MAX_PARTITION_ORDER, FLAGS },
1472 { "max_partition_order", NULL, offsetof(FlacEncodeContext, options.max_partition_order), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, MAX_PARTITION_ORDER, FLAGS },
1473 { "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" },
1474 { "estimation", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_EST }, INT_MIN, INT_MAX, FLAGS, "predm" },
1475 { "2level", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_2LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" },
1476 { "4level", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_4LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" },
1477 { "8level", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_8LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" },
1478 { "search", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_SEARCH }, INT_MIN, INT_MAX, FLAGS, "predm" },
1479 { "log", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_LOG }, INT_MIN, INT_MAX, FLAGS, "predm" },
1480 { "ch_mode", "Stereo decorrelation mode", offsetof(FlacEncodeContext, options.ch_mode), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, FLAC_CHMODE_MID_SIDE, FLAGS, "ch_mode" },
1481 { "auto", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = -1 }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
1482 { "indep", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_INDEPENDENT }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
1483 { "left_side", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_LEFT_SIDE }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
1484 { "right_side", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_RIGHT_SIDE }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
1485 { "mid_side", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_MID_SIDE }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
1486 { "exact_rice_parameters", "Calculate rice parameters exactly", offsetof(FlacEncodeContext, options.exact_rice_parameters), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
1487 { "multi_dim_quant", "Multi-dimensional quantization", offsetof(FlacEncodeContext, options.multi_dim_quant), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
1488 { "min_prediction_order", NULL, offsetof(FlacEncodeContext, options.min_prediction_order), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, MAX_LPC_ORDER, FLAGS },
1489 { "max_prediction_order", NULL, offsetof(FlacEncodeContext, options.max_prediction_order), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, MAX_LPC_ORDER, FLAGS },
1494 static const AVClass flac_encoder_class = {
1495 .class_name = "FLAC encoder",
1496 .item_name = av_default_item_name,
1498 .version = LIBAVUTIL_VERSION_INT,
1501 AVCodec ff_flac_encoder = {
1503 .long_name = NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"),
1504 .type = AVMEDIA_TYPE_AUDIO,
1505 .id = AV_CODEC_ID_FLAC,
1506 .priv_data_size = sizeof(FlacEncodeContext),
1507 .init = flac_encode_init,
1508 .encode2 = flac_encode_frame,
1509 .close = flac_encode_close,
1510 .capabilities = AV_CODEC_CAP_SMALL_LAST_FRAME | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_LOSSLESS,
1511 .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
1513 AV_SAMPLE_FMT_NONE },
1514 .priv_class = &flac_encoder_class,