mirror of
https://github.com/pineappleEA/pineapple-src.git
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1517 lines
50 KiB
C
Executable File
1517 lines
50 KiB
C
Executable File
/*
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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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#include "libavutil/avassert.h"
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#include "libavutil/crc.h"
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#include "libavutil/intmath.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 "bswapdsp.h"
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#include "put_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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#include "flacdsp.h"
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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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#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 MIN_LPC_SHIFT 0
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#define MAX_LPC_SHIFT 15
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enum CodingMode {
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CODING_MODE_RICE = 4,
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CODING_MODE_RICE2 = 5,
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};
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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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int ch_mode;
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int exact_rice_parameters;
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int multi_dim_quant;
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} CompressionOptions;
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typedef struct RiceContext {
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enum CodingMode coding_mode;
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int porder;
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int params[MAX_PARTITIONS];
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} RiceContext;
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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 wasted;
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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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uint32_t rc_udata[FLAC_MAX_BLOCKSIZE];
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uint64_t rc_sums[32][MAX_PARTITIONS];
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int32_t samples[FLAC_MAX_BLOCKSIZE];
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int32_t residual[FLAC_MAX_BLOCKSIZE+11];
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} FlacSubframe;
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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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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 bps_code;
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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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uint8_t *md5_buffer;
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unsigned int md5_buffer_size;
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BswapDSPContext bdsp;
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FLACDSPContext flac_dsp;
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int flushed;
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int64_t next_pts;
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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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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, s->avctx->bits_per_raw_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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* 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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av_assert0(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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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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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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switch (avctx->sample_fmt) {
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case AV_SAMPLE_FMT_S16:
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avctx->bits_per_raw_sample = 16;
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s->bps_code = 4;
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break;
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case AV_SAMPLE_FMT_S32:
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if (avctx->bits_per_raw_sample != 24)
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av_log(avctx, AV_LOG_WARNING, "encoding as 24 bits-per-sample\n");
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avctx->bits_per_raw_sample = 24;
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s->bps_code = 6;
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break;
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}
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if (channels < 1 || channels > FLAC_MAX_CHANNELS) {
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av_log(avctx, AV_LOG_ERROR, "%d channels not supported (max %d)\n",
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channels, FLAC_MAX_CHANNELS);
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return AVERROR(EINVAL);
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}
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s->channels = channels;
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/* find samplerate in table */
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if (freq < 1)
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return AVERROR(EINVAL);
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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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av_log(avctx, AV_LOG_ERROR, "%d Hz not supported\n", freq);
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return AVERROR(EINVAL);
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}
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s->samplerate = freq;
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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 AVERROR(EINVAL);
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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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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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if (s->options.min_prediction_order < 0)
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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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if (s->options.max_prediction_order < 0)
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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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#if FF_API_PRIVATE_OPT
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FF_DISABLE_DEPRECATION_WARNINGS
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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_WARNING,
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"invalid min prediction order %d, clamped to %d\n",
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avctx->min_prediction_order, MAX_FIXED_ORDER);
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avctx->min_prediction_order = MAX_FIXED_ORDER;
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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 AVERROR(EINVAL);
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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 (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_WARNING,
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"invalid max prediction order %d, clamped to %d\n",
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avctx->max_prediction_order, MAX_FIXED_ORDER);
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avctx->max_prediction_order = MAX_FIXED_ORDER;
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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 AVERROR(EINVAL);
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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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FF_ENABLE_DEPRECATION_WARNINGS
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#endif
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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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s->options.max_prediction_order = 0;
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} else if (s->options.lpc_type == FF_LPC_TYPE_FIXED) {
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if (s->options.min_prediction_order > MAX_FIXED_ORDER) {
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av_log(avctx, AV_LOG_WARNING,
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"invalid min prediction order %d, clamped to %d\n",
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s->options.min_prediction_order, MAX_FIXED_ORDER);
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s->options.min_prediction_order = MAX_FIXED_ORDER;
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}
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if (s->options.max_prediction_order > MAX_FIXED_ORDER) {
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av_log(avctx, AV_LOG_WARNING,
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"invalid max prediction order %d, clamped to %d\n",
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s->options.max_prediction_order, MAX_FIXED_ORDER);
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s->options.max_prediction_order = MAX_FIXED_ORDER;
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}
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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 AVERROR(EINVAL);
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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 AVERROR(EINVAL);
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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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/* 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,
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s->avctx->bits_per_raw_sample);
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/* initialize MD5 context */
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s->md5ctx = av_md5_alloc();
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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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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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s->frame_count = 0;
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s->min_framesize = s->max_framesize;
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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) {
|
|
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);
|
|
|
|
ff_bswapdsp_init(&s->bdsp);
|
|
ff_flacdsp_init(&s->flac_dsp, avctx->sample_fmt, channels,
|
|
avctx->bits_per_raw_sample);
|
|
|
|
dprint_compression_options(s);
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
static void init_frame(FlacEncodeContext *s, int nb_samples)
|
|
{
|
|
int i, ch;
|
|
FlacFrame *frame;
|
|
|
|
frame = &s->frame;
|
|
|
|
for (i = 0; i < 16; i++) {
|
|
if (nb_samples == 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 = nb_samples;
|
|
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++) {
|
|
FlacSubframe *sub = &frame->subframes[ch];
|
|
|
|
sub->wasted = 0;
|
|
sub->obits = s->avctx->bits_per_raw_sample;
|
|
|
|
if (sub->obits > 16)
|
|
sub->rc.coding_mode = CODING_MODE_RICE2;
|
|
else
|
|
sub->rc.coding_mode = CODING_MODE_RICE;
|
|
}
|
|
|
|
frame->verbatim_only = 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* Copy channel-interleaved input samples into separate subframes.
|
|
*/
|
|
static void copy_samples(FlacEncodeContext *s, const void *samples)
|
|
{
|
|
int i, j, ch;
|
|
FlacFrame *frame;
|
|
int shift = av_get_bytes_per_sample(s->avctx->sample_fmt) * 8 -
|
|
s->avctx->bits_per_raw_sample;
|
|
|
|
#define COPY_SAMPLES(bits) do { \
|
|
const int ## bits ## _t *samples0 = samples; \
|
|
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] = samples0[j] >> shift; \
|
|
} while (0)
|
|
|
|
if (s->avctx->sample_fmt == AV_SAMPLE_FMT_S16)
|
|
COPY_SAMPLES(16);
|
|
else
|
|
COPY_SAMPLES(32);
|
|
}
|
|
|
|
|
|
static uint64_t rice_count_exact(const int32_t *res, int n, int k)
|
|
{
|
|
int i;
|
|
uint64_t 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 uint64_t subframe_count_exact(FlacEncodeContext *s, FlacSubframe *sub,
|
|
int pred_order)
|
|
{
|
|
int p, porder, psize;
|
|
int i, part_end;
|
|
uint64_t count = 0;
|
|
|
|
/* subframe header */
|
|
count += 8;
|
|
|
|
if (sub->wasted)
|
|
count += sub->wasted;
|
|
|
|
/* 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 += sub->rc.coding_mode;
|
|
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(uint64_t sum, int n, int max_param)
|
|
{
|
|
int k;
|
|
uint64_t sum2;
|
|
|
|
if (sum <= n >> 1)
|
|
return 0;
|
|
sum2 = sum - (n >> 1);
|
|
k = av_log2(av_clipl_int32(sum2 / n));
|
|
return FFMIN(k, max_param);
|
|
}
|
|
|
|
static int find_optimal_param_exact(uint64_t sums[32][MAX_PARTITIONS], int i, int max_param)
|
|
{
|
|
int bestk = 0;
|
|
int64_t bestbits = INT64_MAX;
|
|
int k;
|
|
|
|
for (k = 0; k <= max_param; k++) {
|
|
int64_t bits = sums[k][i];
|
|
if (bits < bestbits) {
|
|
bestbits = bits;
|
|
bestk = k;
|
|
}
|
|
}
|
|
|
|
return bestk;
|
|
}
|
|
|
|
static uint64_t calc_optimal_rice_params(RiceContext *rc, int porder,
|
|
uint64_t sums[32][MAX_PARTITIONS],
|
|
int n, int pred_order, int max_param, int exact)
|
|
{
|
|
int i;
|
|
int k, cnt, part;
|
|
uint64_t all_bits;
|
|
|
|
part = (1 << porder);
|
|
all_bits = 4 * part;
|
|
|
|
cnt = (n >> porder) - pred_order;
|
|
for (i = 0; i < part; i++) {
|
|
if (exact) {
|
|
k = find_optimal_param_exact(sums, i, max_param);
|
|
all_bits += sums[k][i];
|
|
} else {
|
|
k = find_optimal_param(sums[0][i], cnt, max_param);
|
|
all_bits += rice_encode_count(sums[0][i], cnt, k);
|
|
}
|
|
rc->params[i] = k;
|
|
cnt = n >> porder;
|
|
}
|
|
|
|
rc->porder = porder;
|
|
|
|
return all_bits;
|
|
}
|
|
|
|
|
|
static void calc_sum_top(int pmax, int kmax, const uint32_t *data, int n, int pred_order,
|
|
uint64_t sums[32][MAX_PARTITIONS])
|
|
{
|
|
int i, k;
|
|
int parts;
|
|
const uint32_t *res, *res_end;
|
|
|
|
/* sums for highest level */
|
|
parts = (1 << pmax);
|
|
|
|
for (k = 0; k <= kmax; k++) {
|
|
res = &data[pred_order];
|
|
res_end = &data[n >> pmax];
|
|
for (i = 0; i < parts; i++) {
|
|
if (kmax) {
|
|
uint64_t sum = (1LL + k) * (res_end - res);
|
|
while (res < res_end)
|
|
sum += *(res++) >> k;
|
|
sums[k][i] = sum;
|
|
} else {
|
|
uint64_t sum = 0;
|
|
while (res < res_end)
|
|
sum += *(res++);
|
|
sums[k][i] = sum;
|
|
}
|
|
res_end += n >> pmax;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void calc_sum_next(int level, uint64_t sums[32][MAX_PARTITIONS], int kmax)
|
|
{
|
|
int i, k;
|
|
int parts = (1 << level);
|
|
for (i = 0; i < parts; i++) {
|
|
for (k=0; k<=kmax; k++)
|
|
sums[k][i] = sums[k][2*i] + sums[k][2*i+1];
|
|
}
|
|
}
|
|
|
|
static uint64_t calc_rice_params(RiceContext *rc,
|
|
uint32_t udata[FLAC_MAX_BLOCKSIZE],
|
|
uint64_t sums[32][MAX_PARTITIONS],
|
|
int pmin, int pmax,
|
|
const int32_t *data, int n, int pred_order, int exact)
|
|
{
|
|
int i;
|
|
uint64_t bits[MAX_PARTITION_ORDER+1];
|
|
int opt_porder;
|
|
RiceContext tmp_rc;
|
|
int kmax = (1 << rc->coding_mode) - 2;
|
|
|
|
av_assert1(pmin >= 0 && pmin <= MAX_PARTITION_ORDER);
|
|
av_assert1(pmax >= 0 && pmax <= MAX_PARTITION_ORDER);
|
|
av_assert1(pmin <= pmax);
|
|
|
|
tmp_rc.coding_mode = rc->coding_mode;
|
|
|
|
for (i = 0; i < n; i++)
|
|
udata[i] = (2 * data[i]) ^ (data[i] >> 31);
|
|
|
|
calc_sum_top(pmax, exact ? kmax : 0, udata, n, pred_order, sums);
|
|
|
|
opt_porder = pmin;
|
|
bits[pmin] = UINT32_MAX;
|
|
for (i = pmax; ; ) {
|
|
bits[i] = calc_optimal_rice_params(&tmp_rc, i, sums, n, pred_order, kmax, exact);
|
|
if (bits[i] < bits[opt_porder] || pmax == pmin) {
|
|
opt_porder = i;
|
|
*rc = tmp_rc;
|
|
}
|
|
if (i == pmin)
|
|
break;
|
|
calc_sum_next(--i, sums, exact ? kmax : 0);
|
|
}
|
|
|
|
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 uint64_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);
|
|
|
|
uint64_t bits = 8 + pred_order * sub->obits + 2 + sub->rc.coding_mode;
|
|
if (sub->type == FLAC_SUBFRAME_LPC)
|
|
bits += 4 + 5 + pred_order * s->options.lpc_coeff_precision;
|
|
bits += calc_rice_params(&sub->rc, sub->rc_udata, sub->rc_sums, pmin, pmax, sub->residual,
|
|
s->frame.blocksize, pred_order, s->options.exact_rice_parameters);
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
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) {
|
|
uint64_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,
|
|
MIN_LPC_SHIFT, MAX_LPC_SHIFT, 0);
|
|
|
|
if (omethod == ORDER_METHOD_2LEVEL ||
|
|
omethod == ORDER_METHOD_4LEVEL ||
|
|
omethod == ORDER_METHOD_8LEVEL) {
|
|
int levels = 1 << omethod;
|
|
uint64_t bits[1 << ORDER_METHOD_8LEVEL];
|
|
int order = -1;
|
|
int opt_index = levels-1;
|
|
opt_order = max_order-1;
|
|
bits[opt_index] = UINT32_MAX;
|
|
for (i = levels-1; i >= 0; i--) {
|
|
int last_order = order;
|
|
order = min_order + (((max_order-min_order+1) * (i+1)) / levels)-1;
|
|
order = av_clip(order, min_order - 1, max_order - 1);
|
|
if (order == last_order)
|
|
continue;
|
|
if (s->bps_code * 4 + s->options.lpc_coeff_precision + av_log2(order) <= 32) {
|
|
s->flac_dsp.lpc16_encode(res, smp, n, order+1, coefs[order],
|
|
shift[order]);
|
|
} else {
|
|
s->flac_dsp.lpc32_encode(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
|
|
uint64_t bits[MAX_LPC_ORDER];
|
|
opt_order = 0;
|
|
bits[0] = UINT32_MAX;
|
|
for (i = min_order-1; i < max_order; i++) {
|
|
if (s->bps_code * 4 + s->options.lpc_coeff_precision + av_log2(i) <= 32) {
|
|
s->flac_dsp.lpc16_encode(res, smp, n, i+1, coefs[i], shift[i]);
|
|
} else {
|
|
s->flac_dsp.lpc32_encode(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) {
|
|
uint64_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;
|
|
if (s->bps_code * 4 + s->options.lpc_coeff_precision + av_log2(i) <= 32) {
|
|
s->flac_dsp.lpc32_encode(res, smp, n, i+1, coefs[i], shift[i]);
|
|
} else {
|
|
s->flac_dsp.lpc16_encode(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++;
|
|
}
|
|
|
|
if (s->options.multi_dim_quant) {
|
|
int allsteps = 1;
|
|
int i, step, improved;
|
|
int64_t best_score = INT64_MAX;
|
|
int32_t qmax;
|
|
|
|
qmax = (1 << (s->options.lpc_coeff_precision - 1)) - 1;
|
|
|
|
for (i=0; i<opt_order; i++)
|
|
allsteps *= 3;
|
|
|
|
do {
|
|
improved = 0;
|
|
for (step = 0; step < allsteps; step++) {
|
|
int tmp = step;
|
|
int32_t lpc_try[MAX_LPC_ORDER];
|
|
int64_t score = 0;
|
|
int diffsum = 0;
|
|
|
|
for (i=0; i<opt_order; i++) {
|
|
int diff = ((tmp + 1) % 3) - 1;
|
|
lpc_try[i] = av_clip(coefs[opt_order - 1][i] + diff, -qmax, qmax);
|
|
tmp /= 3;
|
|
diffsum += !!diff;
|
|
}
|
|
if (diffsum >8)
|
|
continue;
|
|
|
|
if (s->bps_code * 4 + s->options.lpc_coeff_precision + av_log2(opt_order - 1) <= 32) {
|
|
s->flac_dsp.lpc16_encode(res, smp, n, opt_order, lpc_try, shift[opt_order-1]);
|
|
} else {
|
|
s->flac_dsp.lpc32_encode(res, smp, n, opt_order, lpc_try, shift[opt_order-1]);
|
|
}
|
|
score = find_subframe_rice_params(s, sub, opt_order);
|
|
if (score < best_score) {
|
|
best_score = score;
|
|
memcpy(coefs[opt_order-1], lpc_try, sizeof(*coefs));
|
|
improved=1;
|
|
}
|
|
}
|
|
} while(improved);
|
|
}
|
|
|
|
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];
|
|
|
|
if (s->bps_code * 4 + s->options.lpc_coeff_precision + av_log2(opt_order) <= 32) {
|
|
s->flac_dsp.lpc16_encode(res, smp, n, sub->order, sub->coefs, sub->shift);
|
|
} else {
|
|
s->flac_dsp.lpc32_encode(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) * 2) * 8;
|
|
|
|
/* frame header CRC-8 */
|
|
count += 8;
|
|
|
|
return count;
|
|
}
|
|
|
|
|
|
static int encode_frame(FlacEncodeContext *s)
|
|
{
|
|
int ch;
|
|
uint64_t 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
|
|
|
|
count >>= 3;
|
|
if (count > INT_MAX)
|
|
return AVERROR_BUG;
|
|
return count;
|
|
}
|
|
|
|
|
|
static void remove_wasted_bits(FlacEncodeContext *s)
|
|
{
|
|
int ch, i;
|
|
|
|
for (ch = 0; ch < s->channels; ch++) {
|
|
FlacSubframe *sub = &s->frame.subframes[ch];
|
|
int32_t v = 0;
|
|
|
|
for (i = 0; i < s->frame.blocksize; i++) {
|
|
v |= sub->samples[i];
|
|
if (v & 1)
|
|
break;
|
|
}
|
|
|
|
if (v && !(v & 1)) {
|
|
v = ff_ctz(v);
|
|
|
|
for (i = 0; i < s->frame.blocksize; i++)
|
|
sub->samples[i] >>= v;
|
|
|
|
sub->wasted = v;
|
|
sub->obits -= v;
|
|
|
|
/* for 24-bit, check if removing wasted bits makes the range better
|
|
suited for using RICE instead of RICE2 for entropy coding */
|
|
if (sub->obits <= 17)
|
|
sub->rc.coding_mode = CODING_MODE_RICE;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
static int estimate_stereo_mode(const int32_t *left_ch, const int32_t *right_ch, int n,
|
|
int max_rice_param)
|
|
{
|
|
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, max_rice_param);
|
|
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;
|
|
|
|
return best;
|
|
}
|
|
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
|
|
if (s->options.ch_mode < 0) {
|
|
int max_rice_param = (1 << frame->subframes[0].rc.coding_mode) - 2;
|
|
frame->ch_mode = estimate_stereo_mode(left, right, n, max_rice_param);
|
|
} else
|
|
frame->ch_mode = s->options.ch_mode;
|
|
|
|
/* 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 + FLAC_MAX_CHANNELS - 1);
|
|
|
|
put_bits(&s->pb, 3, s->bps_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, !!sub->wasted);
|
|
if (sub->wasted)
|
|
put_bits(&s->pb, sub->wasted, 1);
|
|
|
|
/* 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, sub->rc.coding_mode - 4);
|
|
|
|
/* 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, sub->rc.coding_mode, 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 int update_md5_sum(FlacEncodeContext *s, const void *samples)
|
|
{
|
|
const uint8_t *buf;
|
|
int buf_size = s->frame.blocksize * s->channels *
|
|
((s->avctx->bits_per_raw_sample + 7) / 8);
|
|
|
|
if (s->avctx->bits_per_raw_sample > 16 || HAVE_BIGENDIAN) {
|
|
av_fast_malloc(&s->md5_buffer, &s->md5_buffer_size, buf_size);
|
|
if (!s->md5_buffer)
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
if (s->avctx->bits_per_raw_sample <= 16) {
|
|
buf = (const uint8_t *)samples;
|
|
#if HAVE_BIGENDIAN
|
|
s->bdsp.bswap16_buf((uint16_t *) s->md5_buffer,
|
|
(const uint16_t *) samples, buf_size / 2);
|
|
buf = s->md5_buffer;
|
|
#endif
|
|
} else {
|
|
int i;
|
|
const int32_t *samples0 = samples;
|
|
uint8_t *tmp = s->md5_buffer;
|
|
|
|
for (i = 0; i < s->frame.blocksize * s->channels; i++) {
|
|
int32_t v = samples0[i] >> 8;
|
|
AV_WL24(tmp + 3*i, v);
|
|
}
|
|
buf = s->md5_buffer;
|
|
}
|
|
av_md5_update(s->md5ctx, buf, buf_size);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int flac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
|
|
const AVFrame *frame, int *got_packet_ptr)
|
|
{
|
|
FlacEncodeContext *s;
|
|
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);
|
|
|
|
#if FF_API_SIDEDATA_ONLY_PKT
|
|
FF_DISABLE_DEPRECATION_WARNINGS
|
|
if (avctx->side_data_only_packets && !s->flushed) {
|
|
FF_ENABLE_DEPRECATION_WARNINGS
|
|
#else
|
|
if (!s->flushed) {
|
|
#endif
|
|
uint8_t *side_data = av_packet_new_side_data(avpkt, AV_PKT_DATA_NEW_EXTRADATA,
|
|
avctx->extradata_size);
|
|
if (!side_data)
|
|
return AVERROR(ENOMEM);
|
|
memcpy(side_data, avctx->extradata, avctx->extradata_size);
|
|
|
|
avpkt->pts = s->next_pts;
|
|
|
|
*got_packet_ptr = 1;
|
|
s->flushed = 1;
|
|
}
|
|
|
|
return 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,
|
|
avctx->bits_per_raw_sample);
|
|
}
|
|
|
|
init_frame(s, frame->nb_samples);
|
|
|
|
copy_samples(s, frame->data[0]);
|
|
|
|
channel_decorrelation(s);
|
|
|
|
remove_wasted_bits(s);
|
|
|
|
frame_bytes = encode_frame(s);
|
|
|
|
/* Fall back on verbatim mode if the compressed frame is larger than it
|
|
would be if encoded uncompressed. */
|
|
if (frame_bytes < 0 || frame_bytes > s->max_framesize) {
|
|
s->frame.verbatim_only = 1;
|
|
frame_bytes = encode_frame(s);
|
|
if (frame_bytes < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "Bad frame count\n");
|
|
return frame_bytes;
|
|
}
|
|
}
|
|
|
|
if ((ret = ff_alloc_packet2(avctx, avpkt, frame_bytes, 0)) < 0)
|
|
return ret;
|
|
|
|
out_bytes = write_frame(s, avpkt);
|
|
|
|
s->frame_count++;
|
|
s->sample_count += frame->nb_samples;
|
|
if ((ret = update_md5_sum(s, frame->data[0])) < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "Error updating MD5 checksum\n");
|
|
return ret;
|
|
}
|
|
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;
|
|
|
|
s->next_pts = avpkt->pts + avpkt->duration;
|
|
|
|
*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);
|
|
av_freep(&s->md5_buffer);
|
|
ff_lpc_end(&s->lpc_ctx);
|
|
}
|
|
av_freep(&avctx->extradata);
|
|
avctx->extradata_size = 0;
|
|
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, {.i64 = 15 }, 0, MAX_LPC_PRECISION, FLAGS },
|
|
{ "lpc_type", "LPC algorithm", offsetof(FlacEncodeContext, options.lpc_type), AV_OPT_TYPE_INT, {.i64 = FF_LPC_TYPE_DEFAULT }, FF_LPC_TYPE_DEFAULT, FF_LPC_TYPE_NB-1, FLAGS, "lpc_type" },
|
|
{ "none", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_NONE }, INT_MIN, INT_MAX, FLAGS, "lpc_type" },
|
|
{ "fixed", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_FIXED }, INT_MIN, INT_MAX, FLAGS, "lpc_type" },
|
|
{ "levinson", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_LEVINSON }, INT_MIN, INT_MAX, FLAGS, "lpc_type" },
|
|
{ "cholesky", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 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, {.i64 = 2 }, 1, INT_MAX, FLAGS },
|
|
{ "min_partition_order", NULL, offsetof(FlacEncodeContext, options.min_partition_order), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, MAX_PARTITION_ORDER, FLAGS },
|
|
{ "max_partition_order", NULL, offsetof(FlacEncodeContext, options.max_partition_order), AV_OPT_TYPE_INT, {.i64 = -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, {.i64 = -1 }, -1, ORDER_METHOD_LOG, FLAGS, "predm" },
|
|
{ "estimation", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_EST }, INT_MIN, INT_MAX, FLAGS, "predm" },
|
|
{ "2level", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_2LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" },
|
|
{ "4level", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_4LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" },
|
|
{ "8level", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_8LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" },
|
|
{ "search", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_SEARCH }, INT_MIN, INT_MAX, FLAGS, "predm" },
|
|
{ "log", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_LOG }, INT_MIN, INT_MAX, FLAGS, "predm" },
|
|
{ "ch_mode", "Stereo decorrelation mode", offsetof(FlacEncodeContext, options.ch_mode), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, FLAC_CHMODE_MID_SIDE, FLAGS, "ch_mode" },
|
|
{ "auto", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = -1 }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
|
|
{ "indep", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_INDEPENDENT }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
|
|
{ "left_side", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_LEFT_SIDE }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
|
|
{ "right_side", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_RIGHT_SIDE }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
|
|
{ "mid_side", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_MID_SIDE }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
|
|
{ "exact_rice_parameters", "Calculate rice parameters exactly", offsetof(FlacEncodeContext, options.exact_rice_parameters), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
|
|
{ "multi_dim_quant", "Multi-dimensional quantization", offsetof(FlacEncodeContext, options.multi_dim_quant), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
|
|
{ "min_prediction_order", NULL, offsetof(FlacEncodeContext, options.min_prediction_order), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, MAX_LPC_ORDER, FLAGS },
|
|
{ "max_prediction_order", NULL, offsetof(FlacEncodeContext, options.max_prediction_order), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, MAX_LPC_ORDER, FLAGS },
|
|
|
|
{ NULL },
|
|
};
|
|
|
|
static const AVClass flac_encoder_class = {
|
|
.class_name = "FLAC encoder",
|
|
.item_name = av_default_item_name,
|
|
.option = options,
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
};
|
|
|
|
AVCodec ff_flac_encoder = {
|
|
.name = "flac",
|
|
.long_name = NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"),
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.id = AV_CODEC_ID_FLAC,
|
|
.priv_data_size = sizeof(FlacEncodeContext),
|
|
.init = flac_encode_init,
|
|
.encode2 = flac_encode_frame,
|
|
.close = flac_encode_close,
|
|
.capabilities = AV_CODEC_CAP_SMALL_LAST_FRAME | AV_CODEC_CAP_DELAY,
|
|
.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
|
|
AV_SAMPLE_FMT_S32,
|
|
AV_SAMPLE_FMT_NONE },
|
|
.priv_class = &flac_encoder_class,
|
|
};
|