| /** |
| * FLAC audio encoder |
| * Copyright (c) 2006 Justin Ruggles <justin.ruggles@gmail.com> |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "libavutil/crc.h" |
| #include "libavutil/md5.h" |
| #include "libavutil/opt.h" |
| #include "avcodec.h" |
| #include "get_bits.h" |
| #include "golomb.h" |
| #include "lpc.h" |
| #include "flac.h" |
| #include "flacdata.h" |
| |
| #define FLAC_SUBFRAME_CONSTANT 0 |
| #define FLAC_SUBFRAME_VERBATIM 1 |
| #define FLAC_SUBFRAME_FIXED 8 |
| #define FLAC_SUBFRAME_LPC 32 |
| |
| #define MAX_FIXED_ORDER 4 |
| #define MAX_PARTITION_ORDER 8 |
| #define MAX_PARTITIONS (1 << MAX_PARTITION_ORDER) |
| #define MAX_LPC_PRECISION 15 |
| #define MAX_LPC_SHIFT 15 |
| #define MAX_RICE_PARAM 14 |
| |
| typedef struct CompressionOptions { |
| int compression_level; |
| int block_time_ms; |
| enum FFLPCType lpc_type; |
| int lpc_passes; |
| int lpc_coeff_precision; |
| int min_prediction_order; |
| int max_prediction_order; |
| int prediction_order_method; |
| int min_partition_order; |
| int max_partition_order; |
| } CompressionOptions; |
| |
| typedef struct RiceContext { |
| int porder; |
| int params[MAX_PARTITIONS]; |
| } RiceContext; |
| |
| typedef struct FlacSubframe { |
| int type; |
| int type_code; |
| int obits; |
| int order; |
| int32_t coefs[MAX_LPC_ORDER]; |
| int shift; |
| RiceContext rc; |
| int32_t samples[FLAC_MAX_BLOCKSIZE]; |
| int32_t residual[FLAC_MAX_BLOCKSIZE+1]; |
| } FlacSubframe; |
| |
| typedef struct FlacFrame { |
| FlacSubframe subframes[FLAC_MAX_CHANNELS]; |
| int blocksize; |
| int bs_code[2]; |
| uint8_t crc8; |
| int ch_mode; |
| int verbatim_only; |
| } FlacFrame; |
| |
| typedef struct FlacEncodeContext { |
| AVClass *class; |
| PutBitContext pb; |
| int channels; |
| int samplerate; |
| int sr_code[2]; |
| int max_blocksize; |
| int min_framesize; |
| int max_framesize; |
| int max_encoded_framesize; |
| uint32_t frame_count; |
| uint64_t sample_count; |
| uint8_t md5sum[16]; |
| FlacFrame frame; |
| CompressionOptions options; |
| AVCodecContext *avctx; |
| LPCContext lpc_ctx; |
| struct AVMD5 *md5ctx; |
| } FlacEncodeContext; |
| |
| |
| /** |
| * Write streaminfo metadata block to byte array. |
| */ |
| static void write_streaminfo(FlacEncodeContext *s, uint8_t *header) |
| { |
| PutBitContext pb; |
| |
| memset(header, 0, FLAC_STREAMINFO_SIZE); |
| init_put_bits(&pb, header, FLAC_STREAMINFO_SIZE); |
| |
| /* streaminfo metadata block */ |
| put_bits(&pb, 16, s->max_blocksize); |
| put_bits(&pb, 16, s->max_blocksize); |
| put_bits(&pb, 24, s->min_framesize); |
| put_bits(&pb, 24, s->max_framesize); |
| put_bits(&pb, 20, s->samplerate); |
| put_bits(&pb, 3, s->channels-1); |
| put_bits(&pb, 5, 15); /* bits per sample - 1 */ |
| /* write 36-bit sample count in 2 put_bits() calls */ |
| put_bits(&pb, 24, (s->sample_count & 0xFFFFFF000LL) >> 12); |
| put_bits(&pb, 12, s->sample_count & 0x000000FFFLL); |
| flush_put_bits(&pb); |
| memcpy(&header[18], s->md5sum, 16); |
| } |
| |
| |
| /** |
| * Set blocksize based on samplerate. |
| * Choose the closest predefined blocksize >= BLOCK_TIME_MS milliseconds. |
| */ |
| static int select_blocksize(int samplerate, int block_time_ms) |
| { |
| int i; |
| int target; |
| int blocksize; |
| |
| assert(samplerate > 0); |
| blocksize = ff_flac_blocksize_table[1]; |
| target = (samplerate * block_time_ms) / 1000; |
| for (i = 0; i < 16; i++) { |
| if (target >= ff_flac_blocksize_table[i] && |
| ff_flac_blocksize_table[i] > blocksize) { |
| blocksize = ff_flac_blocksize_table[i]; |
| } |
| } |
| return blocksize; |
| } |
| |
| |
| static av_cold void dprint_compression_options(FlacEncodeContext *s) |
| { |
| AVCodecContext *avctx = s->avctx; |
| CompressionOptions *opt = &s->options; |
| |
| av_log(avctx, AV_LOG_DEBUG, " compression: %d\n", opt->compression_level); |
| |
| switch (opt->lpc_type) { |
| case FF_LPC_TYPE_NONE: |
| av_log(avctx, AV_LOG_DEBUG, " lpc type: None\n"); |
| break; |
| case FF_LPC_TYPE_FIXED: |
| av_log(avctx, AV_LOG_DEBUG, " lpc type: Fixed pre-defined coefficients\n"); |
| break; |
| case FF_LPC_TYPE_LEVINSON: |
| av_log(avctx, AV_LOG_DEBUG, " lpc type: Levinson-Durbin recursion with Welch window\n"); |
| break; |
| case FF_LPC_TYPE_CHOLESKY: |
| av_log(avctx, AV_LOG_DEBUG, " lpc type: Cholesky factorization, %d pass%s\n", |
| opt->lpc_passes, opt->lpc_passes == 1 ? "" : "es"); |
| break; |
| } |
| |
| av_log(avctx, AV_LOG_DEBUG, " prediction order: %d, %d\n", |
| opt->min_prediction_order, opt->max_prediction_order); |
| |
| switch (opt->prediction_order_method) { |
| case ORDER_METHOD_EST: |
| av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "estimate"); |
| break; |
| case ORDER_METHOD_2LEVEL: |
| av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "2-level"); |
| break; |
| case ORDER_METHOD_4LEVEL: |
| av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "4-level"); |
| break; |
| case ORDER_METHOD_8LEVEL: |
| av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "8-level"); |
| break; |
| case ORDER_METHOD_SEARCH: |
| av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "full search"); |
| break; |
| case ORDER_METHOD_LOG: |
| av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "log search"); |
| break; |
| } |
| |
| |
| av_log(avctx, AV_LOG_DEBUG, " partition order: %d, %d\n", |
| opt->min_partition_order, opt->max_partition_order); |
| |
| av_log(avctx, AV_LOG_DEBUG, " block size: %d\n", avctx->frame_size); |
| |
| av_log(avctx, AV_LOG_DEBUG, " lpc precision: %d\n", |
| opt->lpc_coeff_precision); |
| } |
| |
| |
| static av_cold int flac_encode_init(AVCodecContext *avctx) |
| { |
| int freq = avctx->sample_rate; |
| int channels = avctx->channels; |
| FlacEncodeContext *s = avctx->priv_data; |
| int i, level, ret; |
| uint8_t *streaminfo; |
| |
| s->avctx = avctx; |
| |
| if (avctx->sample_fmt != AV_SAMPLE_FMT_S16) |
| return -1; |
| |
| if (channels < 1 || channels > FLAC_MAX_CHANNELS) |
| return -1; |
| s->channels = channels; |
| |
| /* find samplerate in table */ |
| if (freq < 1) |
| return -1; |
| for (i = 4; i < 12; i++) { |
| if (freq == ff_flac_sample_rate_table[i]) { |
| s->samplerate = ff_flac_sample_rate_table[i]; |
| s->sr_code[0] = i; |
| s->sr_code[1] = 0; |
| break; |
| } |
| } |
| /* if not in table, samplerate is non-standard */ |
| if (i == 12) { |
| if (freq % 1000 == 0 && freq < 255000) { |
| s->sr_code[0] = 12; |
| s->sr_code[1] = freq / 1000; |
| } else if (freq % 10 == 0 && freq < 655350) { |
| s->sr_code[0] = 14; |
| s->sr_code[1] = freq / 10; |
| } else if (freq < 65535) { |
| s->sr_code[0] = 13; |
| s->sr_code[1] = freq; |
| } else { |
| return -1; |
| } |
| s->samplerate = freq; |
| } |
| |
| /* set compression option defaults based on avctx->compression_level */ |
| if (avctx->compression_level < 0) |
| s->options.compression_level = 5; |
| else |
| s->options.compression_level = avctx->compression_level; |
| |
| level = s->options.compression_level; |
| if (level > 12) { |
| av_log(avctx, AV_LOG_ERROR, "invalid compression level: %d\n", |
| s->options.compression_level); |
| return -1; |
| } |
| |
| s->options.block_time_ms = ((int[]){ 27, 27, 27,105,105,105,105,105,105,105,105,105,105})[level]; |
| |
| if (s->options.lpc_type == FF_LPC_TYPE_DEFAULT) |
| s->options.lpc_type = ((int[]){ FF_LPC_TYPE_FIXED, FF_LPC_TYPE_FIXED, FF_LPC_TYPE_FIXED, |
| FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, |
| FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, |
| FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, |
| FF_LPC_TYPE_LEVINSON})[level]; |
| |
| s->options.min_prediction_order = ((int[]){ 2, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1})[level]; |
| s->options.max_prediction_order = ((int[]){ 3, 4, 4, 6, 8, 8, 8, 8, 12, 12, 12, 32, 32})[level]; |
| |
| if (s->options.prediction_order_method < 0) |
| s->options.prediction_order_method = ((int[]){ ORDER_METHOD_EST, ORDER_METHOD_EST, ORDER_METHOD_EST, |
| ORDER_METHOD_EST, ORDER_METHOD_EST, ORDER_METHOD_EST, |
| ORDER_METHOD_4LEVEL, ORDER_METHOD_LOG, ORDER_METHOD_4LEVEL, |
| ORDER_METHOD_LOG, ORDER_METHOD_SEARCH, ORDER_METHOD_LOG, |
| ORDER_METHOD_SEARCH})[level]; |
| |
| if (s->options.min_partition_order > s->options.max_partition_order) { |
| av_log(avctx, AV_LOG_ERROR, "invalid partition orders: min=%d max=%d\n", |
| s->options.min_partition_order, s->options.max_partition_order); |
| return AVERROR(EINVAL); |
| } |
| if (s->options.min_partition_order < 0) |
| s->options.min_partition_order = ((int[]){ 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0})[level]; |
| if (s->options.max_partition_order < 0) |
| s->options.max_partition_order = ((int[]){ 2, 2, 3, 3, 3, 8, 8, 8, 8, 8, 8, 8, 8})[level]; |
| |
| /* set compression option overrides from AVCodecContext */ |
| #if FF_API_FLAC_GLOBAL_OPTS |
| if (avctx->lpc_type > FF_LPC_TYPE_DEFAULT) { |
| if (avctx->lpc_type > FF_LPC_TYPE_CHOLESKY) { |
| av_log(avctx, AV_LOG_ERROR, "unknown lpc type: %d\n", avctx->lpc_type); |
| return -1; |
| } |
| s->options.lpc_type = avctx->lpc_type; |
| if (s->options.lpc_type == FF_LPC_TYPE_CHOLESKY) { |
| if (avctx->lpc_passes < 0) { |
| // default number of passes for Cholesky |
| s->options.lpc_passes = 2; |
| } else if (avctx->lpc_passes == 0) { |
| av_log(avctx, AV_LOG_ERROR, "invalid number of lpc passes: %d\n", |
| avctx->lpc_passes); |
| return -1; |
| } else { |
| s->options.lpc_passes = avctx->lpc_passes; |
| } |
| } |
| } |
| #endif |
| |
| if (s->options.lpc_type == FF_LPC_TYPE_NONE) { |
| s->options.min_prediction_order = 0; |
| } else if (avctx->min_prediction_order >= 0) { |
| if (s->options.lpc_type == FF_LPC_TYPE_FIXED) { |
| if (avctx->min_prediction_order > MAX_FIXED_ORDER) { |
| av_log(avctx, AV_LOG_ERROR, "invalid min prediction order: %d\n", |
| avctx->min_prediction_order); |
| return -1; |
| } |
| } else if (avctx->min_prediction_order < MIN_LPC_ORDER || |
| avctx->min_prediction_order > MAX_LPC_ORDER) { |
| av_log(avctx, AV_LOG_ERROR, "invalid min prediction order: %d\n", |
| avctx->min_prediction_order); |
| return -1; |
| } |
| s->options.min_prediction_order = avctx->min_prediction_order; |
| } |
| if (s->options.lpc_type == FF_LPC_TYPE_NONE) { |
| s->options.max_prediction_order = 0; |
| } else if (avctx->max_prediction_order >= 0) { |
| if (s->options.lpc_type == FF_LPC_TYPE_FIXED) { |
| if (avctx->max_prediction_order > MAX_FIXED_ORDER) { |
| av_log(avctx, AV_LOG_ERROR, "invalid max prediction order: %d\n", |
| avctx->max_prediction_order); |
| return -1; |
| } |
| } else if (avctx->max_prediction_order < MIN_LPC_ORDER || |
| avctx->max_prediction_order > MAX_LPC_ORDER) { |
| av_log(avctx, AV_LOG_ERROR, "invalid max prediction order: %d\n", |
| avctx->max_prediction_order); |
| return -1; |
| } |
| s->options.max_prediction_order = avctx->max_prediction_order; |
| } |
| if (s->options.max_prediction_order < s->options.min_prediction_order) { |
| av_log(avctx, AV_LOG_ERROR, "invalid prediction orders: min=%d max=%d\n", |
| s->options.min_prediction_order, s->options.max_prediction_order); |
| return -1; |
| } |
| |
| #if FF_API_FLAC_GLOBAL_OPTS |
| if (avctx->prediction_order_method >= 0) { |
| if (avctx->prediction_order_method > ORDER_METHOD_LOG) { |
| av_log(avctx, AV_LOG_ERROR, "invalid prediction order method: %d\n", |
| avctx->prediction_order_method); |
| return -1; |
| } |
| s->options.prediction_order_method = avctx->prediction_order_method; |
| } |
| |
| if (avctx->min_partition_order >= 0) { |
| if (avctx->min_partition_order > MAX_PARTITION_ORDER) { |
| av_log(avctx, AV_LOG_ERROR, "invalid min partition order: %d\n", |
| avctx->min_partition_order); |
| return -1; |
| } |
| s->options.min_partition_order = avctx->min_partition_order; |
| } |
| if (avctx->max_partition_order >= 0) { |
| if (avctx->max_partition_order > MAX_PARTITION_ORDER) { |
| av_log(avctx, AV_LOG_ERROR, "invalid max partition order: %d\n", |
| avctx->max_partition_order); |
| return -1; |
| } |
| s->options.max_partition_order = avctx->max_partition_order; |
| } |
| if (s->options.max_partition_order < s->options.min_partition_order) { |
| av_log(avctx, AV_LOG_ERROR, "invalid partition orders: min=%d max=%d\n", |
| s->options.min_partition_order, s->options.max_partition_order); |
| return -1; |
| } |
| #endif |
| |
| if (avctx->frame_size > 0) { |
| if (avctx->frame_size < FLAC_MIN_BLOCKSIZE || |
| avctx->frame_size > FLAC_MAX_BLOCKSIZE) { |
| av_log(avctx, AV_LOG_ERROR, "invalid block size: %d\n", |
| avctx->frame_size); |
| return -1; |
| } |
| } else { |
| s->avctx->frame_size = select_blocksize(s->samplerate, s->options.block_time_ms); |
| } |
| s->max_blocksize = s->avctx->frame_size; |
| |
| #if FF_API_FLAC_GLOBAL_OPTS |
| /* set LPC precision */ |
| if (avctx->lpc_coeff_precision > 0) { |
| if (avctx->lpc_coeff_precision > MAX_LPC_PRECISION) { |
| av_log(avctx, AV_LOG_ERROR, "invalid lpc coeff precision: %d\n", |
| avctx->lpc_coeff_precision); |
| return -1; |
| } |
| s->options.lpc_coeff_precision = avctx->lpc_coeff_precision; |
| } |
| #endif |
| |
| /* set maximum encoded frame size in verbatim mode */ |
| s->max_framesize = ff_flac_get_max_frame_size(s->avctx->frame_size, |
| s->channels, 16); |
| |
| /* initialize MD5 context */ |
| s->md5ctx = av_malloc(av_md5_size); |
| if (!s->md5ctx) |
| return AVERROR(ENOMEM); |
| av_md5_init(s->md5ctx); |
| |
| streaminfo = av_malloc(FLAC_STREAMINFO_SIZE); |
| if (!streaminfo) |
| return AVERROR(ENOMEM); |
| write_streaminfo(s, streaminfo); |
| avctx->extradata = streaminfo; |
| avctx->extradata_size = FLAC_STREAMINFO_SIZE; |
| |
| s->frame_count = 0; |
| s->min_framesize = s->max_framesize; |
| |
| avctx->coded_frame = avcodec_alloc_frame(); |
| if (!avctx->coded_frame) |
| return AVERROR(ENOMEM); |
| |
| if (channels == 3 && |
| avctx->channel_layout != (AV_CH_LAYOUT_STEREO|AV_CH_FRONT_CENTER) || |
| channels == 4 && |
| avctx->channel_layout != AV_CH_LAYOUT_2_2 && |
| avctx->channel_layout != AV_CH_LAYOUT_QUAD || |
| channels == 5 && |
| avctx->channel_layout != AV_CH_LAYOUT_5POINT0 && |
| avctx->channel_layout != AV_CH_LAYOUT_5POINT0_BACK || |
| channels == 6 && |
| avctx->channel_layout != AV_CH_LAYOUT_5POINT1 && |
| avctx->channel_layout != AV_CH_LAYOUT_5POINT1_BACK) { |
| if (avctx->channel_layout) { |
| av_log(avctx, AV_LOG_ERROR, "Channel layout not supported by Flac, " |
| "output stream will have incorrect " |
| "channel layout.\n"); |
| } else { |
| av_log(avctx, AV_LOG_WARNING, "No channel layout specified. The encoder " |
| "will use Flac channel layout for " |
| "%d channels.\n", channels); |
| } |
| } |
| |
| ret = ff_lpc_init(&s->lpc_ctx, avctx->frame_size, |
| s->options.max_prediction_order, FF_LPC_TYPE_LEVINSON); |
| |
| dprint_compression_options(s); |
| |
| return ret; |
| } |
| |
| |
| static void init_frame(FlacEncodeContext *s) |
| { |
| int i, ch; |
| FlacFrame *frame; |
| |
| frame = &s->frame; |
| |
| for (i = 0; i < 16; i++) { |
| if (s->avctx->frame_size == ff_flac_blocksize_table[i]) { |
| frame->blocksize = ff_flac_blocksize_table[i]; |
| frame->bs_code[0] = i; |
| frame->bs_code[1] = 0; |
| break; |
| } |
| } |
| if (i == 16) { |
| frame->blocksize = s->avctx->frame_size; |
| if (frame->blocksize <= 256) { |
| frame->bs_code[0] = 6; |
| frame->bs_code[1] = frame->blocksize-1; |
| } else { |
| frame->bs_code[0] = 7; |
| frame->bs_code[1] = frame->blocksize-1; |
| } |
| } |
| |
| for (ch = 0; ch < s->channels; ch++) |
| frame->subframes[ch].obits = 16; |
| |
| frame->verbatim_only = 0; |
| } |
| |
| |
| /** |
| * Copy channel-interleaved input samples into separate subframes. |
| */ |
| static void copy_samples(FlacEncodeContext *s, const int16_t *samples) |
| { |
| int i, j, ch; |
| FlacFrame *frame; |
| |
| frame = &s->frame; |
| for (i = 0, j = 0; i < frame->blocksize; i++) |
| for (ch = 0; ch < s->channels; ch++, j++) |
| frame->subframes[ch].samples[i] = samples[j]; |
| } |
| |
| |
| static int rice_count_exact(int32_t *res, int n, int k) |
| { |
| int i; |
| int count = 0; |
| |
| for (i = 0; i < n; i++) { |
| int32_t v = -2 * res[i] - 1; |
| v ^= v >> 31; |
| count += (v >> k) + 1 + k; |
| } |
| return count; |
| } |
| |
| |
| static int subframe_count_exact(FlacEncodeContext *s, FlacSubframe *sub, |
| int pred_order) |
| { |
| int p, porder, psize; |
| int i, part_end; |
| int count = 0; |
| |
| /* subframe header */ |
| count += 8; |
| |
| /* subframe */ |
| if (sub->type == FLAC_SUBFRAME_CONSTANT) { |
| count += sub->obits; |
| } else if (sub->type == FLAC_SUBFRAME_VERBATIM) { |
| count += s->frame.blocksize * sub->obits; |
| } else { |
| /* warm-up samples */ |
| count += pred_order * sub->obits; |
| |
| /* LPC coefficients */ |
| if (sub->type == FLAC_SUBFRAME_LPC) |
| count += 4 + 5 + pred_order * s->options.lpc_coeff_precision; |
| |
| /* rice-encoded block */ |
| count += 2; |
| |
| /* partition order */ |
| porder = sub->rc.porder; |
| psize = s->frame.blocksize >> porder; |
| count += 4; |
| |
| /* residual */ |
| i = pred_order; |
| part_end = psize; |
| for (p = 0; p < 1 << porder; p++) { |
| int k = sub->rc.params[p]; |
| count += 4; |
| count += rice_count_exact(&sub->residual[i], part_end - i, k); |
| i = part_end; |
| part_end = FFMIN(s->frame.blocksize, part_end + psize); |
| } |
| } |
| |
| return count; |
| } |
| |
| |
| #define rice_encode_count(sum, n, k) (((n)*((k)+1))+((sum-(n>>1))>>(k))) |
| |
| /** |
| * Solve for d/dk(rice_encode_count) = n-((sum-(n>>1))>>(k+1)) = 0. |
| */ |
| static int find_optimal_param(uint32_t sum, int n) |
| { |
| int k; |
| uint32_t sum2; |
| |
| if (sum <= n >> 1) |
| return 0; |
| sum2 = sum - (n >> 1); |
| k = av_log2(n < 256 ? FASTDIV(sum2, n) : sum2 / n); |
| return FFMIN(k, MAX_RICE_PARAM); |
| } |
| |
| |
| static uint32_t calc_optimal_rice_params(RiceContext *rc, int porder, |
| uint32_t *sums, int n, int pred_order) |
| { |
| int i; |
| int k, cnt, part; |
| uint32_t all_bits; |
| |
| part = (1 << porder); |
| all_bits = 4 * part; |
| |
| cnt = (n >> porder) - pred_order; |
| for (i = 0; i < part; i++) { |
| k = find_optimal_param(sums[i], cnt); |
| rc->params[i] = k; |
| all_bits += rice_encode_count(sums[i], cnt, k); |
| cnt = n >> porder; |
| } |
| |
| rc->porder = porder; |
| |
| return all_bits; |
| } |
| |
| |
| static void calc_sums(int pmin, int pmax, uint32_t *data, int n, int pred_order, |
| uint32_t sums[][MAX_PARTITIONS]) |
| { |
| int i, j; |
| int parts; |
| uint32_t *res, *res_end; |
| |
| /* sums for highest level */ |
| parts = (1 << pmax); |
| res = &data[pred_order]; |
| res_end = &data[n >> pmax]; |
| for (i = 0; i < parts; i++) { |
| uint32_t sum = 0; |
| while (res < res_end) |
| sum += *(res++); |
| sums[pmax][i] = sum; |
| res_end += n >> pmax; |
| } |
| /* sums for lower levels */ |
| for (i = pmax - 1; i >= pmin; i--) { |
| parts = (1 << i); |
| for (j = 0; j < parts; j++) |
| sums[i][j] = sums[i+1][2*j] + sums[i+1][2*j+1]; |
| } |
| } |
| |
| |
| static uint32_t calc_rice_params(RiceContext *rc, int pmin, int pmax, |
| int32_t *data, int n, int pred_order) |
| { |
| int i; |
| uint32_t bits[MAX_PARTITION_ORDER+1]; |
| int opt_porder; |
| RiceContext tmp_rc; |
| uint32_t *udata; |
| uint32_t sums[MAX_PARTITION_ORDER+1][MAX_PARTITIONS]; |
| |
| assert(pmin >= 0 && pmin <= MAX_PARTITION_ORDER); |
| assert(pmax >= 0 && pmax <= MAX_PARTITION_ORDER); |
| assert(pmin <= pmax); |
| |
| udata = av_malloc(n * sizeof(uint32_t)); |
| for (i = 0; i < n; i++) |
| udata[i] = (2*data[i]) ^ (data[i]>>31); |
| |
| calc_sums(pmin, pmax, udata, n, pred_order, sums); |
| |
| opt_porder = pmin; |
| bits[pmin] = UINT32_MAX; |
| for (i = pmin; i <= pmax; i++) { |
| bits[i] = calc_optimal_rice_params(&tmp_rc, i, sums[i], n, pred_order); |
| if (bits[i] <= bits[opt_porder]) { |
| opt_porder = i; |
| *rc = tmp_rc; |
| } |
| } |
| |
| av_freep(&udata); |
| return bits[opt_porder]; |
| } |
| |
| |
| static int get_max_p_order(int max_porder, int n, int order) |
| { |
| int porder = FFMIN(max_porder, av_log2(n^(n-1))); |
| if (order > 0) |
| porder = FFMIN(porder, av_log2(n/order)); |
| return porder; |
| } |
| |
| |
| static uint32_t find_subframe_rice_params(FlacEncodeContext *s, |
| FlacSubframe *sub, int pred_order) |
| { |
| int pmin = get_max_p_order(s->options.min_partition_order, |
| s->frame.blocksize, pred_order); |
| int pmax = get_max_p_order(s->options.max_partition_order, |
| s->frame.blocksize, pred_order); |
| |
| uint32_t bits = 8 + pred_order * sub->obits + 2 + 4; |
| if (sub->type == FLAC_SUBFRAME_LPC) |
| bits += 4 + 5 + pred_order * s->options.lpc_coeff_precision; |
| bits += calc_rice_params(&sub->rc, pmin, pmax, sub->residual, |
| s->frame.blocksize, pred_order); |
| return bits; |
| } |
| |
| |
| static void encode_residual_fixed(int32_t *res, const int32_t *smp, int n, |
| int order) |
| { |
| int i; |
| |
| for (i = 0; i < order; i++) |
| res[i] = smp[i]; |
| |
| if (order == 0) { |
| for (i = order; i < n; i++) |
| res[i] = smp[i]; |
| } else if (order == 1) { |
| for (i = order; i < n; i++) |
| res[i] = smp[i] - smp[i-1]; |
| } else if (order == 2) { |
| int a = smp[order-1] - smp[order-2]; |
| for (i = order; i < n; i += 2) { |
| int b = smp[i ] - smp[i-1]; |
| res[i] = b - a; |
| a = smp[i+1] - smp[i ]; |
| res[i+1] = a - b; |
| } |
| } else if (order == 3) { |
| int a = smp[order-1] - smp[order-2]; |
| int c = smp[order-1] - 2*smp[order-2] + smp[order-3]; |
| for (i = order; i < n; i += 2) { |
| int b = smp[i ] - smp[i-1]; |
| int d = b - a; |
| res[i] = d - c; |
| a = smp[i+1] - smp[i ]; |
| c = a - b; |
| res[i+1] = c - d; |
| } |
| } else { |
| int a = smp[order-1] - smp[order-2]; |
| int c = smp[order-1] - 2*smp[order-2] + smp[order-3]; |
| int e = smp[order-1] - 3*smp[order-2] + 3*smp[order-3] - smp[order-4]; |
| for (i = order; i < n; i += 2) { |
| int b = smp[i ] - smp[i-1]; |
| int d = b - a; |
| int f = d - c; |
| res[i ] = f - e; |
| a = smp[i+1] - smp[i ]; |
| c = a - b; |
| e = c - d; |
| res[i+1] = e - f; |
| } |
| } |
| } |
| |
| |
| #define LPC1(x) {\ |
| int c = coefs[(x)-1];\ |
| p0 += c * s;\ |
| s = smp[i-(x)+1];\ |
| p1 += c * s;\ |
| } |
| |
| static av_always_inline void encode_residual_lpc_unrolled(int32_t *res, |
| const int32_t *smp, int n, int order, |
| const int32_t *coefs, int shift, int big) |
| { |
| int i; |
| for (i = order; i < n; i += 2) { |
| int s = smp[i-order]; |
| int p0 = 0, p1 = 0; |
| if (big) { |
| switch (order) { |
| case 32: LPC1(32) |
| case 31: LPC1(31) |
| case 30: LPC1(30) |
| case 29: LPC1(29) |
| case 28: LPC1(28) |
| case 27: LPC1(27) |
| case 26: LPC1(26) |
| case 25: LPC1(25) |
| case 24: LPC1(24) |
| case 23: LPC1(23) |
| case 22: LPC1(22) |
| case 21: LPC1(21) |
| case 20: LPC1(20) |
| case 19: LPC1(19) |
| case 18: LPC1(18) |
| case 17: LPC1(17) |
| case 16: LPC1(16) |
| case 15: LPC1(15) |
| case 14: LPC1(14) |
| case 13: LPC1(13) |
| case 12: LPC1(12) |
| case 11: LPC1(11) |
| case 10: LPC1(10) |
| case 9: LPC1( 9) |
| LPC1( 8) |
| LPC1( 7) |
| LPC1( 6) |
| LPC1( 5) |
| LPC1( 4) |
| LPC1( 3) |
| LPC1( 2) |
| LPC1( 1) |
| } |
| } else { |
| switch (order) { |
| case 8: LPC1( 8) |
| case 7: LPC1( 7) |
| case 6: LPC1( 6) |
| case 5: LPC1( 5) |
| case 4: LPC1( 4) |
| case 3: LPC1( 3) |
| case 2: LPC1( 2) |
| case 1: LPC1( 1) |
| } |
| } |
| res[i ] = smp[i ] - (p0 >> shift); |
| res[i+1] = smp[i+1] - (p1 >> shift); |
| } |
| } |
| |
| |
| static void encode_residual_lpc(int32_t *res, const int32_t *smp, int n, |
| int order, const int32_t *coefs, int shift) |
| { |
| int i; |
| for (i = 0; i < order; i++) |
| res[i] = smp[i]; |
| #if CONFIG_SMALL |
| for (i = order; i < n; i += 2) { |
| int j; |
| int s = smp[i]; |
| int p0 = 0, p1 = 0; |
| for (j = 0; j < order; j++) { |
| int c = coefs[j]; |
| p1 += c * s; |
| s = smp[i-j-1]; |
| p0 += c * s; |
| } |
| res[i ] = smp[i ] - (p0 >> shift); |
| res[i+1] = smp[i+1] - (p1 >> shift); |
| } |
| #else |
| switch (order) { |
| case 1: encode_residual_lpc_unrolled(res, smp, n, 1, coefs, shift, 0); break; |
| case 2: encode_residual_lpc_unrolled(res, smp, n, 2, coefs, shift, 0); break; |
| case 3: encode_residual_lpc_unrolled(res, smp, n, 3, coefs, shift, 0); break; |
| case 4: encode_residual_lpc_unrolled(res, smp, n, 4, coefs, shift, 0); break; |
| case 5: encode_residual_lpc_unrolled(res, smp, n, 5, coefs, shift, 0); break; |
| case 6: encode_residual_lpc_unrolled(res, smp, n, 6, coefs, shift, 0); break; |
| case 7: encode_residual_lpc_unrolled(res, smp, n, 7, coefs, shift, 0); break; |
| case 8: encode_residual_lpc_unrolled(res, smp, n, 8, coefs, shift, 0); break; |
| default: encode_residual_lpc_unrolled(res, smp, n, order, coefs, shift, 1); break; |
| } |
| #endif |
| } |
| |
| |
| static int encode_residual_ch(FlacEncodeContext *s, int ch) |
| { |
| int i, n; |
| int min_order, max_order, opt_order, omethod; |
| FlacFrame *frame; |
| FlacSubframe *sub; |
| int32_t coefs[MAX_LPC_ORDER][MAX_LPC_ORDER]; |
| int shift[MAX_LPC_ORDER]; |
| int32_t *res, *smp; |
| |
| frame = &s->frame; |
| sub = &frame->subframes[ch]; |
| res = sub->residual; |
| smp = sub->samples; |
| n = frame->blocksize; |
| |
| /* CONSTANT */ |
| for (i = 1; i < n; i++) |
| if(smp[i] != smp[0]) |
| break; |
| if (i == n) { |
| sub->type = sub->type_code = FLAC_SUBFRAME_CONSTANT; |
| res[0] = smp[0]; |
| return subframe_count_exact(s, sub, 0); |
| } |
| |
| /* VERBATIM */ |
| if (frame->verbatim_only || n < 5) { |
| sub->type = sub->type_code = FLAC_SUBFRAME_VERBATIM; |
| memcpy(res, smp, n * sizeof(int32_t)); |
| return subframe_count_exact(s, sub, 0); |
| } |
| |
| min_order = s->options.min_prediction_order; |
| max_order = s->options.max_prediction_order; |
| omethod = s->options.prediction_order_method; |
| |
| /* FIXED */ |
| sub->type = FLAC_SUBFRAME_FIXED; |
| if (s->options.lpc_type == FF_LPC_TYPE_NONE || |
| s->options.lpc_type == FF_LPC_TYPE_FIXED || n <= max_order) { |
| uint32_t bits[MAX_FIXED_ORDER+1]; |
| if (max_order > MAX_FIXED_ORDER) |
| max_order = MAX_FIXED_ORDER; |
| opt_order = 0; |
| bits[0] = UINT32_MAX; |
| for (i = min_order; i <= max_order; i++) { |
| encode_residual_fixed(res, smp, n, i); |
| bits[i] = find_subframe_rice_params(s, sub, i); |
| if (bits[i] < bits[opt_order]) |
| opt_order = i; |
| } |
| sub->order = opt_order; |
| sub->type_code = sub->type | sub->order; |
| if (sub->order != max_order) { |
| encode_residual_fixed(res, smp, n, sub->order); |
| find_subframe_rice_params(s, sub, sub->order); |
| } |
| return subframe_count_exact(s, sub, sub->order); |
| } |
| |
| /* LPC */ |
| sub->type = FLAC_SUBFRAME_LPC; |
| opt_order = ff_lpc_calc_coefs(&s->lpc_ctx, smp, n, min_order, max_order, |
| s->options.lpc_coeff_precision, coefs, shift, s->options.lpc_type, |
| s->options.lpc_passes, omethod, |
| MAX_LPC_SHIFT, 0); |
| |
| if (omethod == ORDER_METHOD_2LEVEL || |
| omethod == ORDER_METHOD_4LEVEL || |
| omethod == ORDER_METHOD_8LEVEL) { |
| int levels = 1 << omethod; |
| uint32_t bits[1 << ORDER_METHOD_8LEVEL]; |
| int order; |
| int opt_index = levels-1; |
| opt_order = max_order-1; |
| bits[opt_index] = UINT32_MAX; |
| for (i = levels-1; i >= 0; i--) { |
| order = min_order + (((max_order-min_order+1) * (i+1)) / levels)-1; |
| if (order < 0) |
| order = 0; |
| encode_residual_lpc(res, smp, n, order+1, coefs[order], shift[order]); |
| bits[i] = find_subframe_rice_params(s, sub, order+1); |
| if (bits[i] < bits[opt_index]) { |
| opt_index = i; |
| opt_order = order; |
| } |
| } |
| opt_order++; |
| } else if (omethod == ORDER_METHOD_SEARCH) { |
| // brute-force optimal order search |
| uint32_t bits[MAX_LPC_ORDER]; |
| opt_order = 0; |
| bits[0] = UINT32_MAX; |
| for (i = min_order-1; i < max_order; i++) { |
| encode_residual_lpc(res, smp, n, i+1, coefs[i], shift[i]); |
| bits[i] = find_subframe_rice_params(s, sub, i+1); |
| if (bits[i] < bits[opt_order]) |
| opt_order = i; |
| } |
| opt_order++; |
| } else if (omethod == ORDER_METHOD_LOG) { |
| uint32_t bits[MAX_LPC_ORDER]; |
| int step; |
| |
| opt_order = min_order - 1 + (max_order-min_order)/3; |
| memset(bits, -1, sizeof(bits)); |
| |
| for (step = 16; step; step >>= 1) { |
| int last = opt_order; |
| for (i = last-step; i <= last+step; i += step) { |
| if (i < min_order-1 || i >= max_order || bits[i] < UINT32_MAX) |
| continue; |
| encode_residual_lpc(res, smp, n, i+1, coefs[i], shift[i]); |
| bits[i] = find_subframe_rice_params(s, sub, i+1); |
| if (bits[i] < bits[opt_order]) |
| opt_order = i; |
| } |
| } |
| opt_order++; |
| } |
| |
| sub->order = opt_order; |
| sub->type_code = sub->type | (sub->order-1); |
| sub->shift = shift[sub->order-1]; |
| for (i = 0; i < sub->order; i++) |
| sub->coefs[i] = coefs[sub->order-1][i]; |
| |
| encode_residual_lpc(res, smp, n, sub->order, sub->coefs, sub->shift); |
| |
| find_subframe_rice_params(s, sub, sub->order); |
| |
| return subframe_count_exact(s, sub, sub->order); |
| } |
| |
| |
| static int count_frame_header(FlacEncodeContext *s) |
| { |
| uint8_t av_unused tmp; |
| int count; |
| |
| /* |
| <14> Sync code |
| <1> Reserved |
| <1> Blocking strategy |
| <4> Block size in inter-channel samples |
| <4> Sample rate |
| <4> Channel assignment |
| <3> Sample size in bits |
| <1> Reserved |
| */ |
| count = 32; |
| |
| /* coded frame number */ |
| PUT_UTF8(s->frame_count, tmp, count += 8;) |
| |
| /* explicit block size */ |
| if (s->frame.bs_code[0] == 6) |
| count += 8; |
| else if (s->frame.bs_code[0] == 7) |
| count += 16; |
| |
| /* explicit sample rate */ |
| count += ((s->sr_code[0] == 12) + (s->sr_code[0] > 12)) * 8; |
| |
| /* frame header CRC-8 */ |
| count += 8; |
| |
| return count; |
| } |
| |
| |
| static int encode_frame(FlacEncodeContext *s) |
| { |
| int ch, count; |
| |
| count = count_frame_header(s); |
| |
| for (ch = 0; ch < s->channels; ch++) |
| count += encode_residual_ch(s, ch); |
| |
| count += (8 - (count & 7)) & 7; // byte alignment |
| count += 16; // CRC-16 |
| |
| return count >> 3; |
| } |
| |
| |
| static int estimate_stereo_mode(int32_t *left_ch, int32_t *right_ch, int n) |
| { |
| int i, best; |
| int32_t lt, rt; |
| uint64_t sum[4]; |
| uint64_t score[4]; |
| int k; |
| |
| /* calculate sum of 2nd order residual for each channel */ |
| sum[0] = sum[1] = sum[2] = sum[3] = 0; |
| for (i = 2; i < n; i++) { |
| lt = left_ch[i] - 2*left_ch[i-1] + left_ch[i-2]; |
| rt = right_ch[i] - 2*right_ch[i-1] + right_ch[i-2]; |
| sum[2] += FFABS((lt + rt) >> 1); |
| sum[3] += FFABS(lt - rt); |
| sum[0] += FFABS(lt); |
| sum[1] += FFABS(rt); |
| } |
| /* estimate bit counts */ |
| for (i = 0; i < 4; i++) { |
| k = find_optimal_param(2 * sum[i], n); |
| sum[i] = rice_encode_count( 2 * sum[i], n, k); |
| } |
| |
| /* calculate score for each mode */ |
| score[0] = sum[0] + sum[1]; |
| score[1] = sum[0] + sum[3]; |
| score[2] = sum[1] + sum[3]; |
| score[3] = sum[2] + sum[3]; |
| |
| /* return mode with lowest score */ |
| best = 0; |
| for (i = 1; i < 4; i++) |
| if (score[i] < score[best]) |
| best = i; |
| if (best == 0) { |
| return FLAC_CHMODE_INDEPENDENT; |
| } else if (best == 1) { |
| return FLAC_CHMODE_LEFT_SIDE; |
| } else if (best == 2) { |
| return FLAC_CHMODE_RIGHT_SIDE; |
| } else { |
| return FLAC_CHMODE_MID_SIDE; |
| } |
| } |
| |
| |
| /** |
| * Perform stereo channel decorrelation. |
| */ |
| static void channel_decorrelation(FlacEncodeContext *s) |
| { |
| FlacFrame *frame; |
| int32_t *left, *right; |
| int i, n; |
| |
| frame = &s->frame; |
| n = frame->blocksize; |
| left = frame->subframes[0].samples; |
| right = frame->subframes[1].samples; |
| |
| if (s->channels != 2) { |
| frame->ch_mode = FLAC_CHMODE_INDEPENDENT; |
| return; |
| } |
| |
| frame->ch_mode = estimate_stereo_mode(left, right, n); |
| |
| /* perform decorrelation and adjust bits-per-sample */ |
| if (frame->ch_mode == FLAC_CHMODE_INDEPENDENT) |
| return; |
| if (frame->ch_mode == FLAC_CHMODE_MID_SIDE) { |
| int32_t tmp; |
| for (i = 0; i < n; i++) { |
| tmp = left[i]; |
| left[i] = (tmp + right[i]) >> 1; |
| right[i] = tmp - right[i]; |
| } |
| frame->subframes[1].obits++; |
| } else if (frame->ch_mode == FLAC_CHMODE_LEFT_SIDE) { |
| for (i = 0; i < n; i++) |
| right[i] = left[i] - right[i]; |
| frame->subframes[1].obits++; |
| } else { |
| for (i = 0; i < n; i++) |
| left[i] -= right[i]; |
| frame->subframes[0].obits++; |
| } |
| } |
| |
| |
| static void write_utf8(PutBitContext *pb, uint32_t val) |
| { |
| uint8_t tmp; |
| PUT_UTF8(val, tmp, put_bits(pb, 8, tmp);) |
| } |
| |
| |
| static void write_frame_header(FlacEncodeContext *s) |
| { |
| FlacFrame *frame; |
| int crc; |
| |
| frame = &s->frame; |
| |
| put_bits(&s->pb, 16, 0xFFF8); |
| put_bits(&s->pb, 4, frame->bs_code[0]); |
| put_bits(&s->pb, 4, s->sr_code[0]); |
| |
| if (frame->ch_mode == FLAC_CHMODE_INDEPENDENT) |
| put_bits(&s->pb, 4, s->channels-1); |
| else |
| put_bits(&s->pb, 4, frame->ch_mode); |
| |
| put_bits(&s->pb, 3, 4); /* bits-per-sample code */ |
| put_bits(&s->pb, 1, 0); |
| write_utf8(&s->pb, s->frame_count); |
| |
| if (frame->bs_code[0] == 6) |
| put_bits(&s->pb, 8, frame->bs_code[1]); |
| else if (frame->bs_code[0] == 7) |
| put_bits(&s->pb, 16, frame->bs_code[1]); |
| |
| if (s->sr_code[0] == 12) |
| put_bits(&s->pb, 8, s->sr_code[1]); |
| else if (s->sr_code[0] > 12) |
| put_bits(&s->pb, 16, s->sr_code[1]); |
| |
| flush_put_bits(&s->pb); |
| crc = av_crc(av_crc_get_table(AV_CRC_8_ATM), 0, s->pb.buf, |
| put_bits_count(&s->pb) >> 3); |
| put_bits(&s->pb, 8, crc); |
| } |
| |
| |
| static void write_subframes(FlacEncodeContext *s) |
| { |
| int ch; |
| |
| for (ch = 0; ch < s->channels; ch++) { |
| FlacSubframe *sub = &s->frame.subframes[ch]; |
| int i, p, porder, psize; |
| int32_t *part_end; |
| int32_t *res = sub->residual; |
| int32_t *frame_end = &sub->residual[s->frame.blocksize]; |
| |
| /* subframe header */ |
| put_bits(&s->pb, 1, 0); |
| put_bits(&s->pb, 6, sub->type_code); |
| put_bits(&s->pb, 1, 0); /* no wasted bits */ |
| |
| /* subframe */ |
| if (sub->type == FLAC_SUBFRAME_CONSTANT) { |
| put_sbits(&s->pb, sub->obits, res[0]); |
| } else if (sub->type == FLAC_SUBFRAME_VERBATIM) { |
| while (res < frame_end) |
| put_sbits(&s->pb, sub->obits, *res++); |
| } else { |
| /* warm-up samples */ |
| for (i = 0; i < sub->order; i++) |
| put_sbits(&s->pb, sub->obits, *res++); |
| |
| /* LPC coefficients */ |
| if (sub->type == FLAC_SUBFRAME_LPC) { |
| int cbits = s->options.lpc_coeff_precision; |
| put_bits( &s->pb, 4, cbits-1); |
| put_sbits(&s->pb, 5, sub->shift); |
| for (i = 0; i < sub->order; i++) |
| put_sbits(&s->pb, cbits, sub->coefs[i]); |
| } |
| |
| /* rice-encoded block */ |
| put_bits(&s->pb, 2, 0); |
| |
| /* partition order */ |
| porder = sub->rc.porder; |
| psize = s->frame.blocksize >> porder; |
| put_bits(&s->pb, 4, porder); |
| |
| /* residual */ |
| part_end = &sub->residual[psize]; |
| for (p = 0; p < 1 << porder; p++) { |
| int k = sub->rc.params[p]; |
| put_bits(&s->pb, 4, k); |
| while (res < part_end) |
| set_sr_golomb_flac(&s->pb, *res++, k, INT32_MAX, 0); |
| part_end = FFMIN(frame_end, part_end + psize); |
| } |
| } |
| } |
| } |
| |
| |
| static void write_frame_footer(FlacEncodeContext *s) |
| { |
| int crc; |
| flush_put_bits(&s->pb); |
| crc = av_bswap16(av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0, s->pb.buf, |
| put_bits_count(&s->pb)>>3)); |
| put_bits(&s->pb, 16, crc); |
| flush_put_bits(&s->pb); |
| } |
| |
| |
| static int write_frame(FlacEncodeContext *s, uint8_t *frame, int buf_size) |
| { |
| init_put_bits(&s->pb, frame, buf_size); |
| write_frame_header(s); |
| write_subframes(s); |
| write_frame_footer(s); |
| return put_bits_count(&s->pb) >> 3; |
| } |
| |
| |
| static void update_md5_sum(FlacEncodeContext *s, const int16_t *samples) |
| { |
| #if HAVE_BIGENDIAN |
| int i; |
| for (i = 0; i < s->frame.blocksize * s->channels; i++) { |
| int16_t smp = av_le2ne16(samples[i]); |
| av_md5_update(s->md5ctx, (uint8_t *)&smp, 2); |
| } |
| #else |
| av_md5_update(s->md5ctx, (const uint8_t *)samples, s->frame.blocksize*s->channels*2); |
| #endif |
| } |
| |
| |
| static int flac_encode_frame(AVCodecContext *avctx, uint8_t *frame, |
| int buf_size, void *data) |
| { |
| FlacEncodeContext *s; |
| const int16_t *samples = data; |
| int frame_bytes, out_bytes; |
| |
| s = avctx->priv_data; |
| |
| /* when the last block is reached, update the header in extradata */ |
| if (!data) { |
| s->max_framesize = s->max_encoded_framesize; |
| av_md5_final(s->md5ctx, s->md5sum); |
| write_streaminfo(s, avctx->extradata); |
| return 0; |
| } |
| |
| /* change max_framesize for small final frame */ |
| if (avctx->frame_size < s->frame.blocksize) { |
| s->max_framesize = ff_flac_get_max_frame_size(avctx->frame_size, |
| s->channels, 16); |
| } |
| |
| init_frame(s); |
| |
| copy_samples(s, samples); |
| |
| channel_decorrelation(s); |
| |
| frame_bytes = encode_frame(s); |
| |
| /* fallback to verbatim mode if the compressed frame is larger than it |
| would be if encoded uncompressed. */ |
| if (frame_bytes > s->max_framesize) { |
| s->frame.verbatim_only = 1; |
| frame_bytes = encode_frame(s); |
| } |
| |
| if (buf_size < frame_bytes) { |
| av_log(avctx, AV_LOG_ERROR, "output buffer too small\n"); |
| return 0; |
| } |
| out_bytes = write_frame(s, frame, buf_size); |
| |
| s->frame_count++; |
| avctx->coded_frame->pts = s->sample_count; |
| s->sample_count += avctx->frame_size; |
| update_md5_sum(s, samples); |
| if (out_bytes > s->max_encoded_framesize) |
| s->max_encoded_framesize = out_bytes; |
| if (out_bytes < s->min_framesize) |
| s->min_framesize = out_bytes; |
| |
| return out_bytes; |
| } |
| |
| |
| static av_cold int flac_encode_close(AVCodecContext *avctx) |
| { |
| if (avctx->priv_data) { |
| FlacEncodeContext *s = avctx->priv_data; |
| av_freep(&s->md5ctx); |
| ff_lpc_end(&s->lpc_ctx); |
| } |
| av_freep(&avctx->extradata); |
| avctx->extradata_size = 0; |
| av_freep(&avctx->coded_frame); |
| return 0; |
| } |
| |
| #define FLAGS AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM |
| static const AVOption options[] = { |
| { "lpc_coeff_precision", "LPC coefficient precision", offsetof(FlacEncodeContext, options.lpc_coeff_precision), FF_OPT_TYPE_INT, {.dbl = 15 }, 0, MAX_LPC_PRECISION, FLAGS }, |
| { "lpc_type", "LPC algorithm", offsetof(FlacEncodeContext, options.lpc_type), FF_OPT_TYPE_INT, {.dbl = FF_LPC_TYPE_DEFAULT }, FF_LPC_TYPE_DEFAULT, FF_LPC_TYPE_NB-1, FLAGS, "lpc_type" }, |
| { "none", NULL, 0, FF_OPT_TYPE_CONST, {.dbl = FF_LPC_TYPE_NONE }, INT_MIN, INT_MAX, FLAGS, "lpc_type" }, |
| { "fixed", NULL, 0, FF_OPT_TYPE_CONST, {.dbl = FF_LPC_TYPE_FIXED }, INT_MIN, INT_MAX, FLAGS, "lpc_type" }, |
| { "levinson", NULL, 0, FF_OPT_TYPE_CONST, {.dbl = FF_LPC_TYPE_LEVINSON }, INT_MIN, INT_MAX, FLAGS, "lpc_type" }, |
| { "cholesky", NULL, 0, FF_OPT_TYPE_CONST, {.dbl = FF_LPC_TYPE_CHOLESKY }, INT_MIN, INT_MAX, FLAGS, "lpc_type" }, |
| { "lpc_passes", "Number of passes to use for Cholesky factorization during LPC analysis", offsetof(FlacEncodeContext, options.lpc_passes), FF_OPT_TYPE_INT, {.dbl = -1 }, INT_MIN, INT_MAX, FLAGS }, |
| { "min_partition_order", NULL, offsetof(FlacEncodeContext, options.min_partition_order), FF_OPT_TYPE_INT, {.dbl = -1 }, -1, MAX_PARTITION_ORDER, FLAGS }, |
| { "max_partition_order", NULL, offsetof(FlacEncodeContext, options.max_partition_order), FF_OPT_TYPE_INT, {.dbl = -1 }, -1, MAX_PARTITION_ORDER, FLAGS }, |
| { "prediction_order_method", "Search method for selecting prediction order", offsetof(FlacEncodeContext, options.prediction_order_method), FF_OPT_TYPE_INT, {.dbl = -1 }, -1, ORDER_METHOD_LOG, FLAGS, "predm" }, |
| { "estimation", NULL, 0, FF_OPT_TYPE_CONST, {.dbl = ORDER_METHOD_EST }, INT_MIN, INT_MAX, FLAGS, "predm" }, |
| { "2level", NULL, 0, FF_OPT_TYPE_CONST, {.dbl = ORDER_METHOD_2LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" }, |
| { "4level", NULL, 0, FF_OPT_TYPE_CONST, {.dbl = ORDER_METHOD_4LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" }, |
| { "8level", NULL, 0, FF_OPT_TYPE_CONST, {.dbl = ORDER_METHOD_8LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" }, |
| { "search", NULL, 0, FF_OPT_TYPE_CONST, {.dbl = ORDER_METHOD_SEARCH }, INT_MIN, INT_MAX, FLAGS, "predm" }, |
| { "log", NULL, 0, FF_OPT_TYPE_CONST, {.dbl = ORDER_METHOD_LOG }, INT_MIN, INT_MAX, FLAGS, "predm" }, |
| { NULL }, |
| }; |
| |
| static const AVClass flac_encoder_class = { |
| "FLAC encoder", |
| av_default_item_name, |
| options, |
| LIBAVUTIL_VERSION_INT, |
| }; |
| |
| AVCodec ff_flac_encoder = { |
| "flac", |
| AVMEDIA_TYPE_AUDIO, |
| CODEC_ID_FLAC, |
| sizeof(FlacEncodeContext), |
| flac_encode_init, |
| flac_encode_frame, |
| flac_encode_close, |
| NULL, |
| .capabilities = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY | CODEC_CAP_LOSSLESS, |
| .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE}, |
| .long_name = NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"), |
| .priv_class = &flac_encoder_class, |
| }; |