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1333 lines
42 KiB
1333 lines
42 KiB
/* |
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* FLAC audio encoder |
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* Copyright (c) 2006 Justin Ruggles <justin.ruggles@gmail.com> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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|
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#include "libavutil/crc.h" |
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#include "libavutil/md5.h" |
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#include "libavutil/opt.h" |
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#include "avcodec.h" |
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#include "get_bits.h" |
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#include "golomb.h" |
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#include "internal.h" |
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#include "lpc.h" |
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#include "flac.h" |
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#include "flacdata.h" |
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|
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#define FLAC_SUBFRAME_CONSTANT 0 |
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#define FLAC_SUBFRAME_VERBATIM 1 |
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#define FLAC_SUBFRAME_FIXED 8 |
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#define FLAC_SUBFRAME_LPC 32 |
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|
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#define MAX_FIXED_ORDER 4 |
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#define MAX_PARTITION_ORDER 8 |
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#define MAX_PARTITIONS (1 << MAX_PARTITION_ORDER) |
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#define MAX_LPC_PRECISION 15 |
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#define MAX_LPC_SHIFT 15 |
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#define MAX_RICE_PARAM 14 |
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typedef struct CompressionOptions { |
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int compression_level; |
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int block_time_ms; |
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enum FFLPCType lpc_type; |
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int lpc_passes; |
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int lpc_coeff_precision; |
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int min_prediction_order; |
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int max_prediction_order; |
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int prediction_order_method; |
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int min_partition_order; |
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int max_partition_order; |
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} CompressionOptions; |
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|
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typedef struct RiceContext { |
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int porder; |
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int params[MAX_PARTITIONS]; |
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} RiceContext; |
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|
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typedef struct FlacSubframe { |
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int type; |
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int type_code; |
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int obits; |
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int order; |
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int32_t coefs[MAX_LPC_ORDER]; |
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int shift; |
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RiceContext rc; |
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int32_t samples[FLAC_MAX_BLOCKSIZE]; |
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int32_t residual[FLAC_MAX_BLOCKSIZE+1]; |
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} FlacSubframe; |
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|
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typedef struct FlacFrame { |
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FlacSubframe subframes[FLAC_MAX_CHANNELS]; |
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int blocksize; |
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int bs_code[2]; |
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uint8_t crc8; |
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int ch_mode; |
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int verbatim_only; |
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} FlacFrame; |
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|
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typedef struct FlacEncodeContext { |
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AVClass *class; |
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PutBitContext pb; |
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int channels; |
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int samplerate; |
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int sr_code[2]; |
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int max_blocksize; |
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int min_framesize; |
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int max_framesize; |
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int max_encoded_framesize; |
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uint32_t frame_count; |
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uint64_t sample_count; |
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uint8_t md5sum[16]; |
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FlacFrame frame; |
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CompressionOptions options; |
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AVCodecContext *avctx; |
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LPCContext lpc_ctx; |
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struct AVMD5 *md5ctx; |
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} FlacEncodeContext; |
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/** |
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* Write streaminfo metadata block to byte array. |
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*/ |
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static void write_streaminfo(FlacEncodeContext *s, uint8_t *header) |
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{ |
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PutBitContext pb; |
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|
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memset(header, 0, FLAC_STREAMINFO_SIZE); |
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init_put_bits(&pb, header, FLAC_STREAMINFO_SIZE); |
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/* streaminfo metadata block */ |
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put_bits(&pb, 16, s->max_blocksize); |
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put_bits(&pb, 16, s->max_blocksize); |
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put_bits(&pb, 24, s->min_framesize); |
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put_bits(&pb, 24, s->max_framesize); |
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put_bits(&pb, 20, s->samplerate); |
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put_bits(&pb, 3, s->channels-1); |
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put_bits(&pb, 5, 15); /* bits per sample - 1 */ |
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/* write 36-bit sample count in 2 put_bits() calls */ |
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put_bits(&pb, 24, (s->sample_count & 0xFFFFFF000LL) >> 12); |
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put_bits(&pb, 12, s->sample_count & 0x000000FFFLL); |
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flush_put_bits(&pb); |
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memcpy(&header[18], s->md5sum, 16); |
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} |
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|
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/** |
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* Set blocksize based on samplerate. |
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* Choose the closest predefined blocksize >= BLOCK_TIME_MS milliseconds. |
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*/ |
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static int select_blocksize(int samplerate, int block_time_ms) |
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{ |
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int i; |
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int target; |
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int blocksize; |
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|
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assert(samplerate > 0); |
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blocksize = ff_flac_blocksize_table[1]; |
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target = (samplerate * block_time_ms) / 1000; |
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for (i = 0; i < 16; i++) { |
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if (target >= ff_flac_blocksize_table[i] && |
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ff_flac_blocksize_table[i] > blocksize) { |
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blocksize = ff_flac_blocksize_table[i]; |
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} |
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} |
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return blocksize; |
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} |
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static av_cold void dprint_compression_options(FlacEncodeContext *s) |
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{ |
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AVCodecContext *avctx = s->avctx; |
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CompressionOptions *opt = &s->options; |
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av_log(avctx, AV_LOG_DEBUG, " compression: %d\n", opt->compression_level); |
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|
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switch (opt->lpc_type) { |
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case FF_LPC_TYPE_NONE: |
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av_log(avctx, AV_LOG_DEBUG, " lpc type: None\n"); |
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break; |
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case FF_LPC_TYPE_FIXED: |
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av_log(avctx, AV_LOG_DEBUG, " lpc type: Fixed pre-defined coefficients\n"); |
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break; |
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case FF_LPC_TYPE_LEVINSON: |
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av_log(avctx, AV_LOG_DEBUG, " lpc type: Levinson-Durbin recursion with Welch window\n"); |
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break; |
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case FF_LPC_TYPE_CHOLESKY: |
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av_log(avctx, AV_LOG_DEBUG, " lpc type: Cholesky factorization, %d pass%s\n", |
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opt->lpc_passes, opt->lpc_passes == 1 ? "" : "es"); |
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break; |
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} |
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av_log(avctx, AV_LOG_DEBUG, " prediction order: %d, %d\n", |
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opt->min_prediction_order, opt->max_prediction_order); |
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|
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switch (opt->prediction_order_method) { |
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case ORDER_METHOD_EST: |
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av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "estimate"); |
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break; |
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case ORDER_METHOD_2LEVEL: |
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av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "2-level"); |
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break; |
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case ORDER_METHOD_4LEVEL: |
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av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "4-level"); |
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break; |
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case ORDER_METHOD_8LEVEL: |
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av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "8-level"); |
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break; |
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case ORDER_METHOD_SEARCH: |
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av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "full search"); |
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break; |
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case ORDER_METHOD_LOG: |
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av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "log search"); |
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break; |
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} |
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av_log(avctx, AV_LOG_DEBUG, " partition order: %d, %d\n", |
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opt->min_partition_order, opt->max_partition_order); |
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av_log(avctx, AV_LOG_DEBUG, " block size: %d\n", avctx->frame_size); |
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av_log(avctx, AV_LOG_DEBUG, " lpc precision: %d\n", |
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opt->lpc_coeff_precision); |
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} |
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static av_cold int flac_encode_init(AVCodecContext *avctx) |
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{ |
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int freq = avctx->sample_rate; |
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int channels = avctx->channels; |
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FlacEncodeContext *s = avctx->priv_data; |
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int i, level, ret; |
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uint8_t *streaminfo; |
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s->avctx = avctx; |
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if (avctx->sample_fmt != AV_SAMPLE_FMT_S16) |
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return -1; |
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if (channels < 1 || channels > FLAC_MAX_CHANNELS) |
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return -1; |
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s->channels = channels; |
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|
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/* find samplerate in table */ |
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if (freq < 1) |
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return -1; |
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for (i = 4; i < 12; i++) { |
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if (freq == ff_flac_sample_rate_table[i]) { |
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s->samplerate = ff_flac_sample_rate_table[i]; |
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s->sr_code[0] = i; |
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s->sr_code[1] = 0; |
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break; |
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} |
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} |
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/* if not in table, samplerate is non-standard */ |
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if (i == 12) { |
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if (freq % 1000 == 0 && freq < 255000) { |
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s->sr_code[0] = 12; |
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s->sr_code[1] = freq / 1000; |
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} else if (freq % 10 == 0 && freq < 655350) { |
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s->sr_code[0] = 14; |
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s->sr_code[1] = freq / 10; |
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} else if (freq < 65535) { |
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s->sr_code[0] = 13; |
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s->sr_code[1] = freq; |
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} else { |
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return -1; |
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} |
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s->samplerate = freq; |
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} |
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|
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/* set compression option defaults based on avctx->compression_level */ |
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if (avctx->compression_level < 0) |
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s->options.compression_level = 5; |
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else |
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s->options.compression_level = avctx->compression_level; |
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level = s->options.compression_level; |
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if (level > 12) { |
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av_log(avctx, AV_LOG_ERROR, "invalid compression level: %d\n", |
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s->options.compression_level); |
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return -1; |
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} |
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s->options.block_time_ms = ((int[]){ 27, 27, 27,105,105,105,105,105,105,105,105,105,105})[level]; |
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|
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if (s->options.lpc_type == FF_LPC_TYPE_DEFAULT) |
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s->options.lpc_type = ((int[]){ FF_LPC_TYPE_FIXED, FF_LPC_TYPE_FIXED, FF_LPC_TYPE_FIXED, |
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FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, |
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FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, |
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FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, |
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FF_LPC_TYPE_LEVINSON})[level]; |
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s->options.min_prediction_order = ((int[]){ 2, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1})[level]; |
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s->options.max_prediction_order = ((int[]){ 3, 4, 4, 6, 8, 8, 8, 8, 12, 12, 12, 32, 32})[level]; |
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if (s->options.prediction_order_method < 0) |
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s->options.prediction_order_method = ((int[]){ ORDER_METHOD_EST, ORDER_METHOD_EST, ORDER_METHOD_EST, |
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ORDER_METHOD_EST, ORDER_METHOD_EST, ORDER_METHOD_EST, |
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ORDER_METHOD_4LEVEL, ORDER_METHOD_LOG, ORDER_METHOD_4LEVEL, |
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ORDER_METHOD_LOG, ORDER_METHOD_SEARCH, ORDER_METHOD_LOG, |
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ORDER_METHOD_SEARCH})[level]; |
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if (s->options.min_partition_order > s->options.max_partition_order) { |
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av_log(avctx, AV_LOG_ERROR, "invalid partition orders: min=%d max=%d\n", |
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s->options.min_partition_order, s->options.max_partition_order); |
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return AVERROR(EINVAL); |
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} |
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if (s->options.min_partition_order < 0) |
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s->options.min_partition_order = ((int[]){ 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0})[level]; |
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if (s->options.max_partition_order < 0) |
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s->options.max_partition_order = ((int[]){ 2, 2, 3, 3, 3, 8, 8, 8, 8, 8, 8, 8, 8})[level]; |
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|
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if (s->options.lpc_type == FF_LPC_TYPE_NONE) { |
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s->options.min_prediction_order = 0; |
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} else if (avctx->min_prediction_order >= 0) { |
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if (s->options.lpc_type == FF_LPC_TYPE_FIXED) { |
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if (avctx->min_prediction_order > MAX_FIXED_ORDER) { |
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av_log(avctx, AV_LOG_ERROR, "invalid min prediction order: %d\n", |
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avctx->min_prediction_order); |
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return -1; |
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} |
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} else if (avctx->min_prediction_order < MIN_LPC_ORDER || |
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avctx->min_prediction_order > MAX_LPC_ORDER) { |
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av_log(avctx, AV_LOG_ERROR, "invalid min prediction order: %d\n", |
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avctx->min_prediction_order); |
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return -1; |
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} |
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s->options.min_prediction_order = avctx->min_prediction_order; |
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} |
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if (s->options.lpc_type == FF_LPC_TYPE_NONE) { |
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s->options.max_prediction_order = 0; |
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} else if (avctx->max_prediction_order >= 0) { |
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if (s->options.lpc_type == FF_LPC_TYPE_FIXED) { |
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if (avctx->max_prediction_order > MAX_FIXED_ORDER) { |
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av_log(avctx, AV_LOG_ERROR, "invalid max prediction order: %d\n", |
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avctx->max_prediction_order); |
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return -1; |
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} |
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} else if (avctx->max_prediction_order < MIN_LPC_ORDER || |
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avctx->max_prediction_order > MAX_LPC_ORDER) { |
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av_log(avctx, AV_LOG_ERROR, "invalid max prediction order: %d\n", |
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avctx->max_prediction_order); |
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return -1; |
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} |
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s->options.max_prediction_order = avctx->max_prediction_order; |
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} |
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if (s->options.max_prediction_order < s->options.min_prediction_order) { |
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av_log(avctx, AV_LOG_ERROR, "invalid prediction orders: min=%d max=%d\n", |
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s->options.min_prediction_order, s->options.max_prediction_order); |
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return -1; |
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} |
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|
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if (avctx->frame_size > 0) { |
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if (avctx->frame_size < FLAC_MIN_BLOCKSIZE || |
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avctx->frame_size > FLAC_MAX_BLOCKSIZE) { |
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av_log(avctx, AV_LOG_ERROR, "invalid block size: %d\n", |
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avctx->frame_size); |
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return -1; |
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} |
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} else { |
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s->avctx->frame_size = select_blocksize(s->samplerate, s->options.block_time_ms); |
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} |
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s->max_blocksize = s->avctx->frame_size; |
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|
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/* set maximum encoded frame size in verbatim mode */ |
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s->max_framesize = ff_flac_get_max_frame_size(s->avctx->frame_size, |
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s->channels, 16); |
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|
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/* initialize MD5 context */ |
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s->md5ctx = av_malloc(av_md5_size); |
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if (!s->md5ctx) |
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return AVERROR(ENOMEM); |
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av_md5_init(s->md5ctx); |
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|
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streaminfo = av_malloc(FLAC_STREAMINFO_SIZE); |
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if (!streaminfo) |
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return AVERROR(ENOMEM); |
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write_streaminfo(s, streaminfo); |
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avctx->extradata = streaminfo; |
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avctx->extradata_size = FLAC_STREAMINFO_SIZE; |
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|
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s->frame_count = 0; |
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s->min_framesize = s->max_framesize; |
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|
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#if FF_API_OLD_ENCODE_AUDIO |
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avctx->coded_frame = avcodec_alloc_frame(); |
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if (!avctx->coded_frame) |
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return AVERROR(ENOMEM); |
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#endif |
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|
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if (channels == 3 && |
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avctx->channel_layout != (AV_CH_LAYOUT_STEREO|AV_CH_FRONT_CENTER) || |
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channels == 4 && |
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avctx->channel_layout != AV_CH_LAYOUT_2_2 && |
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avctx->channel_layout != AV_CH_LAYOUT_QUAD || |
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channels == 5 && |
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avctx->channel_layout != AV_CH_LAYOUT_5POINT0 && |
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avctx->channel_layout != AV_CH_LAYOUT_5POINT0_BACK || |
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channels == 6 && |
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avctx->channel_layout != AV_CH_LAYOUT_5POINT1 && |
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avctx->channel_layout != AV_CH_LAYOUT_5POINT1_BACK) { |
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if (avctx->channel_layout) { |
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av_log(avctx, AV_LOG_ERROR, "Channel layout not supported by Flac, " |
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"output stream will have incorrect " |
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"channel layout.\n"); |
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} else { |
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av_log(avctx, AV_LOG_WARNING, "No channel layout specified. The encoder " |
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"will use Flac channel layout for " |
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"%d channels.\n", channels); |
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} |
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} |
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|
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ret = ff_lpc_init(&s->lpc_ctx, avctx->frame_size, |
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s->options.max_prediction_order, FF_LPC_TYPE_LEVINSON); |
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|
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dprint_compression_options(s); |
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|
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return ret; |
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} |
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|
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|
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static void init_frame(FlacEncodeContext *s, int nb_samples) |
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{ |
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int i, ch; |
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FlacFrame *frame; |
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|
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frame = &s->frame; |
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|
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for (i = 0; i < 16; i++) { |
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if (nb_samples == ff_flac_blocksize_table[i]) { |
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frame->blocksize = ff_flac_blocksize_table[i]; |
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frame->bs_code[0] = i; |
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frame->bs_code[1] = 0; |
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break; |
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} |
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} |
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if (i == 16) { |
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frame->blocksize = nb_samples; |
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if (frame->blocksize <= 256) { |
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frame->bs_code[0] = 6; |
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frame->bs_code[1] = frame->blocksize-1; |
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} else { |
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frame->bs_code[0] = 7; |
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frame->bs_code[1] = frame->blocksize-1; |
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} |
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} |
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|
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for (ch = 0; ch < s->channels; ch++) |
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frame->subframes[ch].obits = 16; |
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|
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frame->verbatim_only = 0; |
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} |
|
|
|
|
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/** |
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* Copy channel-interleaved input samples into separate subframes. |
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*/ |
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static void copy_samples(FlacEncodeContext *s, const int16_t *samples) |
|
{ |
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int i, j, ch; |
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FlacFrame *frame; |
|
|
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frame = &s->frame; |
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for (i = 0, j = 0; i < frame->blocksize; i++) |
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for (ch = 0; ch < s->channels; ch++, j++) |
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frame->subframes[ch].samples[i] = samples[j]; |
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} |
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|
|
|
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static int rice_count_exact(int32_t *res, int n, int k) |
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{ |
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int i; |
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int count = 0; |
|
|
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for (i = 0; i < n; i++) { |
|
int32_t v = -2 * res[i] - 1; |
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v ^= v >> 31; |
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count += (v >> k) + 1 + k; |
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} |
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return count; |
|
} |
|
|
|
|
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static int subframe_count_exact(FlacEncodeContext *s, FlacSubframe *sub, |
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int pred_order) |
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{ |
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int p, porder, psize; |
|
int i, part_end; |
|
int count = 0; |
|
|
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/* subframe header */ |
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count += 8; |
|
|
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/* subframe */ |
|
if (sub->type == FLAC_SUBFRAME_CONSTANT) { |
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count += sub->obits; |
|
} else if (sub->type == FLAC_SUBFRAME_VERBATIM) { |
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count += s->frame.blocksize * sub->obits; |
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} else { |
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/* warm-up samples */ |
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count += pred_order * sub->obits; |
|
|
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/* LPC coefficients */ |
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if (sub->type == FLAC_SUBFRAME_LPC) |
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count += 4 + 5 + pred_order * s->options.lpc_coeff_precision; |
|
|
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/* rice-encoded block */ |
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count += 2; |
|
|
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/* partition order */ |
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porder = sub->rc.porder; |
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psize = s->frame.blocksize >> porder; |
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count += 4; |
|
|
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/* residual */ |
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i = pred_order; |
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part_end = psize; |
|
for (p = 0; p < 1 << porder; p++) { |
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int k = sub->rc.params[p]; |
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count += 4; |
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count += rice_count_exact(&sub->residual[i], part_end - i, k); |
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i = part_end; |
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part_end = FFMIN(s->frame.blocksize, part_end + psize); |
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} |
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} |
|
|
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return count; |
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} |
|
|
|
|
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#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, AVPacket *avpkt) |
|
{ |
|
init_put_bits(&s->pb, avpkt->data, avpkt->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, AVPacket *avpkt, |
|
const AVFrame *frame, int *got_packet_ptr) |
|
{ |
|
FlacEncodeContext *s; |
|
const int16_t *samples; |
|
int frame_bytes, out_bytes, ret; |
|
|
|
s = avctx->priv_data; |
|
|
|
/* when the last block is reached, update the header in extradata */ |
|
if (!frame) { |
|
s->max_framesize = s->max_encoded_framesize; |
|
av_md5_final(s->md5ctx, s->md5sum); |
|
write_streaminfo(s, avctx->extradata); |
|
return 0; |
|
} |
|
samples = (const int16_t *)frame->data[0]; |
|
|
|
/* change max_framesize for small final frame */ |
|
if (frame->nb_samples < s->frame.blocksize) { |
|
s->max_framesize = ff_flac_get_max_frame_size(frame->nb_samples, |
|
s->channels, 16); |
|
} |
|
|
|
init_frame(s, frame->nb_samples); |
|
|
|
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 ((ret = ff_alloc_packet2(avctx, avpkt, frame_bytes))) |
|
return ret; |
|
|
|
out_bytes = write_frame(s, avpkt); |
|
|
|
s->frame_count++; |
|
s->sample_count += frame->nb_samples; |
|
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; |
|
|
|
avpkt->pts = frame->pts; |
|
avpkt->duration = ff_samples_to_time_base(avctx, frame->nb_samples); |
|
avpkt->size = out_bytes; |
|
*got_packet_ptr = 1; |
|
return 0; |
|
} |
|
|
|
|
|
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; |
|
#if FF_API_OLD_ENCODE_AUDIO |
|
av_freep(&avctx->coded_frame); |
|
#endif |
|
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), AV_OPT_TYPE_INT, {.dbl = 15 }, 0, MAX_LPC_PRECISION, FLAGS }, |
|
{ "lpc_type", "LPC algorithm", offsetof(FlacEncodeContext, options.lpc_type), AV_OPT_TYPE_INT, {.dbl = FF_LPC_TYPE_DEFAULT }, FF_LPC_TYPE_DEFAULT, FF_LPC_TYPE_NB-1, FLAGS, "lpc_type" }, |
|
{ "none", NULL, 0, AV_OPT_TYPE_CONST, {.dbl = FF_LPC_TYPE_NONE }, INT_MIN, INT_MAX, FLAGS, "lpc_type" }, |
|
{ "fixed", NULL, 0, AV_OPT_TYPE_CONST, {.dbl = FF_LPC_TYPE_FIXED }, INT_MIN, INT_MAX, FLAGS, "lpc_type" }, |
|
{ "levinson", NULL, 0, AV_OPT_TYPE_CONST, {.dbl = FF_LPC_TYPE_LEVINSON }, INT_MIN, INT_MAX, FLAGS, "lpc_type" }, |
|
{ "cholesky", NULL, 0, AV_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), AV_OPT_TYPE_INT, {.dbl = -1 }, INT_MIN, INT_MAX, FLAGS }, |
|
{ "min_partition_order", NULL, offsetof(FlacEncodeContext, options.min_partition_order), AV_OPT_TYPE_INT, {.dbl = -1 }, -1, MAX_PARTITION_ORDER, FLAGS }, |
|
{ "max_partition_order", NULL, offsetof(FlacEncodeContext, options.max_partition_order), AV_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), AV_OPT_TYPE_INT, {.dbl = -1 }, -1, ORDER_METHOD_LOG, FLAGS, "predm" }, |
|
{ "estimation", NULL, 0, AV_OPT_TYPE_CONST, {.dbl = ORDER_METHOD_EST }, INT_MIN, INT_MAX, FLAGS, "predm" }, |
|
{ "2level", NULL, 0, AV_OPT_TYPE_CONST, {.dbl = ORDER_METHOD_2LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" }, |
|
{ "4level", NULL, 0, AV_OPT_TYPE_CONST, {.dbl = ORDER_METHOD_4LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" }, |
|
{ "8level", NULL, 0, AV_OPT_TYPE_CONST, {.dbl = ORDER_METHOD_8LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" }, |
|
{ "search", NULL, 0, AV_OPT_TYPE_CONST, {.dbl = ORDER_METHOD_SEARCH }, INT_MIN, INT_MAX, FLAGS, "predm" }, |
|
{ "log", NULL, 0, AV_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 = { |
|
.name = "flac", |
|
.type = AVMEDIA_TYPE_AUDIO, |
|
.id = CODEC_ID_FLAC, |
|
.priv_data_size = sizeof(FlacEncodeContext), |
|
.init = flac_encode_init, |
|
.encode2 = flac_encode_frame, |
|
.close = flac_encode_close, |
|
.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, |
|
};
|
|
|