yading@10: /* yading@10: * FLAC audio encoder yading@10: * Copyright (c) 2006 Justin Ruggles yading@10: * yading@10: * This file is part of FFmpeg. yading@10: * yading@10: * FFmpeg is free software; you can redistribute it and/or yading@10: * modify it under the terms of the GNU Lesser General Public yading@10: * License as published by the Free Software Foundation; either yading@10: * version 2.1 of the License, or (at your option) any later version. yading@10: * yading@10: * FFmpeg is distributed in the hope that it will be useful, yading@10: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@10: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@10: * Lesser General Public License for more details. yading@10: * yading@10: * You should have received a copy of the GNU Lesser General Public yading@10: * License along with FFmpeg; if not, write to the Free Software yading@10: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@10: */ yading@10: yading@10: #include "libavutil/avassert.h" yading@10: #include "libavutil/crc.h" yading@10: #include "libavutil/intmath.h" yading@10: #include "libavutil/md5.h" yading@10: #include "libavutil/opt.h" yading@10: #include "avcodec.h" yading@10: #include "dsputil.h" yading@10: #include "put_bits.h" yading@10: #include "golomb.h" yading@10: #include "internal.h" yading@10: #include "lpc.h" yading@10: #include "flac.h" yading@10: #include "flacdata.h" yading@10: #include "flacdsp.h" yading@10: yading@10: #define FLAC_SUBFRAME_CONSTANT 0 yading@10: #define FLAC_SUBFRAME_VERBATIM 1 yading@10: #define FLAC_SUBFRAME_FIXED 8 yading@10: #define FLAC_SUBFRAME_LPC 32 yading@10: yading@10: #define MAX_FIXED_ORDER 4 yading@10: #define MAX_PARTITION_ORDER 8 yading@10: #define MAX_PARTITIONS (1 << MAX_PARTITION_ORDER) yading@10: #define MAX_LPC_PRECISION 15 yading@10: #define MAX_LPC_SHIFT 15 yading@10: yading@10: enum CodingMode { yading@10: CODING_MODE_RICE = 4, yading@10: CODING_MODE_RICE2 = 5, yading@10: }; yading@10: yading@10: typedef struct CompressionOptions { yading@10: int compression_level; yading@10: int block_time_ms; yading@10: enum FFLPCType lpc_type; yading@10: int lpc_passes; yading@10: int lpc_coeff_precision; yading@10: int min_prediction_order; yading@10: int max_prediction_order; yading@10: int prediction_order_method; yading@10: int min_partition_order; yading@10: int max_partition_order; yading@10: int ch_mode; yading@10: } CompressionOptions; yading@10: yading@10: typedef struct RiceContext { yading@10: enum CodingMode coding_mode; yading@10: int porder; yading@10: int params[MAX_PARTITIONS]; yading@10: } RiceContext; yading@10: yading@10: typedef struct FlacSubframe { yading@10: int type; yading@10: int type_code; yading@10: int obits; yading@10: int wasted; yading@10: int order; yading@10: int32_t coefs[MAX_LPC_ORDER]; yading@10: int shift; yading@10: RiceContext rc; yading@10: int32_t samples[FLAC_MAX_BLOCKSIZE]; yading@10: int32_t residual[FLAC_MAX_BLOCKSIZE+1]; yading@10: } FlacSubframe; yading@10: yading@10: typedef struct FlacFrame { yading@10: FlacSubframe subframes[FLAC_MAX_CHANNELS]; yading@10: int blocksize; yading@10: int bs_code[2]; yading@10: uint8_t crc8; yading@10: int ch_mode; yading@10: int verbatim_only; yading@10: } FlacFrame; yading@10: yading@10: typedef struct FlacEncodeContext { yading@10: AVClass *class; yading@10: PutBitContext pb; yading@10: int channels; yading@10: int samplerate; yading@10: int sr_code[2]; yading@10: int bps_code; yading@10: int max_blocksize; yading@10: int min_framesize; yading@10: int max_framesize; yading@10: int max_encoded_framesize; yading@10: uint32_t frame_count; yading@10: uint64_t sample_count; yading@10: uint8_t md5sum[16]; yading@10: FlacFrame frame; yading@10: CompressionOptions options; yading@10: AVCodecContext *avctx; yading@10: LPCContext lpc_ctx; yading@10: struct AVMD5 *md5ctx; yading@10: uint8_t *md5_buffer; yading@10: unsigned int md5_buffer_size; yading@10: DSPContext dsp; yading@10: FLACDSPContext flac_dsp; yading@10: } FlacEncodeContext; yading@10: yading@10: yading@10: /** yading@10: * Write streaminfo metadata block to byte array. yading@10: */ yading@10: static void write_streaminfo(FlacEncodeContext *s, uint8_t *header) yading@10: { yading@10: PutBitContext pb; yading@10: yading@10: memset(header, 0, FLAC_STREAMINFO_SIZE); yading@10: init_put_bits(&pb, header, FLAC_STREAMINFO_SIZE); yading@10: yading@10: /* streaminfo metadata block */ yading@10: put_bits(&pb, 16, s->max_blocksize); yading@10: put_bits(&pb, 16, s->max_blocksize); yading@10: put_bits(&pb, 24, s->min_framesize); yading@10: put_bits(&pb, 24, s->max_framesize); yading@10: put_bits(&pb, 20, s->samplerate); yading@10: put_bits(&pb, 3, s->channels-1); yading@10: put_bits(&pb, 5, s->avctx->bits_per_raw_sample - 1); yading@10: /* write 36-bit sample count in 2 put_bits() calls */ yading@10: put_bits(&pb, 24, (s->sample_count & 0xFFFFFF000LL) >> 12); yading@10: put_bits(&pb, 12, s->sample_count & 0x000000FFFLL); yading@10: flush_put_bits(&pb); yading@10: memcpy(&header[18], s->md5sum, 16); yading@10: } yading@10: yading@10: yading@10: /** yading@10: * Set blocksize based on samplerate. yading@10: * Choose the closest predefined blocksize >= BLOCK_TIME_MS milliseconds. yading@10: */ yading@10: static int select_blocksize(int samplerate, int block_time_ms) yading@10: { yading@10: int i; yading@10: int target; yading@10: int blocksize; yading@10: yading@10: av_assert0(samplerate > 0); yading@10: blocksize = ff_flac_blocksize_table[1]; yading@10: target = (samplerate * block_time_ms) / 1000; yading@10: for (i = 0; i < 16; i++) { yading@10: if (target >= ff_flac_blocksize_table[i] && yading@10: ff_flac_blocksize_table[i] > blocksize) { yading@10: blocksize = ff_flac_blocksize_table[i]; yading@10: } yading@10: } yading@10: return blocksize; yading@10: } yading@10: yading@10: yading@10: static av_cold void dprint_compression_options(FlacEncodeContext *s) yading@10: { yading@10: AVCodecContext *avctx = s->avctx; yading@10: CompressionOptions *opt = &s->options; yading@10: yading@10: av_log(avctx, AV_LOG_DEBUG, " compression: %d\n", opt->compression_level); yading@10: yading@10: switch (opt->lpc_type) { yading@10: case FF_LPC_TYPE_NONE: yading@10: av_log(avctx, AV_LOG_DEBUG, " lpc type: None\n"); yading@10: break; yading@10: case FF_LPC_TYPE_FIXED: yading@10: av_log(avctx, AV_LOG_DEBUG, " lpc type: Fixed pre-defined coefficients\n"); yading@10: break; yading@10: case FF_LPC_TYPE_LEVINSON: yading@10: av_log(avctx, AV_LOG_DEBUG, " lpc type: Levinson-Durbin recursion with Welch window\n"); yading@10: break; yading@10: case FF_LPC_TYPE_CHOLESKY: yading@10: av_log(avctx, AV_LOG_DEBUG, " lpc type: Cholesky factorization, %d pass%s\n", yading@10: opt->lpc_passes, opt->lpc_passes == 1 ? "" : "es"); yading@10: break; yading@10: } yading@10: yading@10: av_log(avctx, AV_LOG_DEBUG, " prediction order: %d, %d\n", yading@10: opt->min_prediction_order, opt->max_prediction_order); yading@10: yading@10: switch (opt->prediction_order_method) { yading@10: case ORDER_METHOD_EST: yading@10: av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "estimate"); yading@10: break; yading@10: case ORDER_METHOD_2LEVEL: yading@10: av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "2-level"); yading@10: break; yading@10: case ORDER_METHOD_4LEVEL: yading@10: av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "4-level"); yading@10: break; yading@10: case ORDER_METHOD_8LEVEL: yading@10: av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "8-level"); yading@10: break; yading@10: case ORDER_METHOD_SEARCH: yading@10: av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "full search"); yading@10: break; yading@10: case ORDER_METHOD_LOG: yading@10: av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "log search"); yading@10: break; yading@10: } yading@10: yading@10: yading@10: av_log(avctx, AV_LOG_DEBUG, " partition order: %d, %d\n", yading@10: opt->min_partition_order, opt->max_partition_order); yading@10: yading@10: av_log(avctx, AV_LOG_DEBUG, " block size: %d\n", avctx->frame_size); yading@10: yading@10: av_log(avctx, AV_LOG_DEBUG, " lpc precision: %d\n", yading@10: opt->lpc_coeff_precision); yading@10: } yading@10: yading@10: yading@10: static av_cold int flac_encode_init(AVCodecContext *avctx) yading@10: { yading@10: int freq = avctx->sample_rate; yading@10: int channels = avctx->channels; yading@10: FlacEncodeContext *s = avctx->priv_data; yading@10: int i, level, ret; yading@10: uint8_t *streaminfo; yading@10: yading@10: s->avctx = avctx; yading@10: yading@10: switch (avctx->sample_fmt) { yading@10: case AV_SAMPLE_FMT_S16: yading@10: avctx->bits_per_raw_sample = 16; yading@10: s->bps_code = 4; yading@10: break; yading@10: case AV_SAMPLE_FMT_S32: yading@10: if (avctx->bits_per_raw_sample != 24) yading@10: av_log(avctx, AV_LOG_WARNING, "encoding as 24 bits-per-sample\n"); yading@10: avctx->bits_per_raw_sample = 24; yading@10: s->bps_code = 6; yading@10: break; yading@10: } yading@10: yading@10: if (channels < 1 || channels > FLAC_MAX_CHANNELS) { yading@10: av_log(avctx, AV_LOG_ERROR, "%d channels not supported (max %d)\n", yading@10: channels, FLAC_MAX_CHANNELS); yading@10: return AVERROR(EINVAL); yading@10: } yading@10: s->channels = channels; yading@10: yading@10: /* find samplerate in table */ yading@10: if (freq < 1) yading@10: return -1; yading@10: for (i = 4; i < 12; i++) { yading@10: if (freq == ff_flac_sample_rate_table[i]) { yading@10: s->samplerate = ff_flac_sample_rate_table[i]; yading@10: s->sr_code[0] = i; yading@10: s->sr_code[1] = 0; yading@10: break; yading@10: } yading@10: } yading@10: /* if not in table, samplerate is non-standard */ yading@10: if (i == 12) { yading@10: if (freq % 1000 == 0 && freq < 255000) { yading@10: s->sr_code[0] = 12; yading@10: s->sr_code[1] = freq / 1000; yading@10: } else if (freq % 10 == 0 && freq < 655350) { yading@10: s->sr_code[0] = 14; yading@10: s->sr_code[1] = freq / 10; yading@10: } else if (freq < 65535) { yading@10: s->sr_code[0] = 13; yading@10: s->sr_code[1] = freq; yading@10: } else { yading@10: av_log(avctx, AV_LOG_ERROR, "%d Hz not supported\n", freq); yading@10: return AVERROR(EINVAL); yading@10: } yading@10: s->samplerate = freq; yading@10: } yading@10: yading@10: /* set compression option defaults based on avctx->compression_level */ yading@10: if (avctx->compression_level < 0) yading@10: s->options.compression_level = 5; yading@10: else yading@10: s->options.compression_level = avctx->compression_level; yading@10: yading@10: level = s->options.compression_level; yading@10: if (level > 12) { yading@10: av_log(avctx, AV_LOG_ERROR, "invalid compression level: %d\n", yading@10: s->options.compression_level); yading@10: return AVERROR(EINVAL); yading@10: } yading@10: yading@10: s->options.block_time_ms = ((int[]){ 27, 27, 27,105,105,105,105,105,105,105,105,105,105})[level]; yading@10: yading@10: if (s->options.lpc_type == FF_LPC_TYPE_DEFAULT) yading@10: s->options.lpc_type = ((int[]){ FF_LPC_TYPE_FIXED, FF_LPC_TYPE_FIXED, FF_LPC_TYPE_FIXED, yading@10: FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, yading@10: FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, yading@10: FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, yading@10: FF_LPC_TYPE_LEVINSON})[level]; yading@10: yading@10: s->options.min_prediction_order = ((int[]){ 2, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1})[level]; yading@10: s->options.max_prediction_order = ((int[]){ 3, 4, 4, 6, 8, 8, 8, 8, 12, 12, 12, 32, 32})[level]; yading@10: yading@10: if (s->options.prediction_order_method < 0) yading@10: s->options.prediction_order_method = ((int[]){ ORDER_METHOD_EST, ORDER_METHOD_EST, ORDER_METHOD_EST, yading@10: ORDER_METHOD_EST, ORDER_METHOD_EST, ORDER_METHOD_EST, yading@10: ORDER_METHOD_4LEVEL, ORDER_METHOD_LOG, ORDER_METHOD_4LEVEL, yading@10: ORDER_METHOD_LOG, ORDER_METHOD_SEARCH, ORDER_METHOD_LOG, yading@10: ORDER_METHOD_SEARCH})[level]; yading@10: yading@10: if (s->options.min_partition_order > s->options.max_partition_order) { yading@10: av_log(avctx, AV_LOG_ERROR, "invalid partition orders: min=%d max=%d\n", yading@10: s->options.min_partition_order, s->options.max_partition_order); yading@10: return AVERROR(EINVAL); yading@10: } yading@10: if (s->options.min_partition_order < 0) yading@10: s->options.min_partition_order = ((int[]){ 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0})[level]; yading@10: if (s->options.max_partition_order < 0) yading@10: s->options.max_partition_order = ((int[]){ 2, 2, 3, 3, 3, 8, 8, 8, 8, 8, 8, 8, 8})[level]; yading@10: yading@10: if (s->options.lpc_type == FF_LPC_TYPE_NONE) { yading@10: s->options.min_prediction_order = 0; yading@10: } else if (avctx->min_prediction_order >= 0) { yading@10: if (s->options.lpc_type == FF_LPC_TYPE_FIXED) { yading@10: if (avctx->min_prediction_order > MAX_FIXED_ORDER) { yading@10: av_log(avctx, AV_LOG_ERROR, "invalid min prediction order: %d\n", yading@10: avctx->min_prediction_order); yading@10: return AVERROR(EINVAL); yading@10: } yading@10: } else if (avctx->min_prediction_order < MIN_LPC_ORDER || yading@10: avctx->min_prediction_order > MAX_LPC_ORDER) { yading@10: av_log(avctx, AV_LOG_ERROR, "invalid min prediction order: %d\n", yading@10: avctx->min_prediction_order); yading@10: return AVERROR(EINVAL); yading@10: } yading@10: s->options.min_prediction_order = avctx->min_prediction_order; yading@10: } yading@10: if (s->options.lpc_type == FF_LPC_TYPE_NONE) { yading@10: s->options.max_prediction_order = 0; yading@10: } else if (avctx->max_prediction_order >= 0) { yading@10: if (s->options.lpc_type == FF_LPC_TYPE_FIXED) { yading@10: if (avctx->max_prediction_order > MAX_FIXED_ORDER) { yading@10: av_log(avctx, AV_LOG_ERROR, "invalid max prediction order: %d\n", yading@10: avctx->max_prediction_order); yading@10: return AVERROR(EINVAL); yading@10: } yading@10: } else if (avctx->max_prediction_order < MIN_LPC_ORDER || yading@10: avctx->max_prediction_order > MAX_LPC_ORDER) { yading@10: av_log(avctx, AV_LOG_ERROR, "invalid max prediction order: %d\n", yading@10: avctx->max_prediction_order); yading@10: return AVERROR(EINVAL); yading@10: } yading@10: s->options.max_prediction_order = avctx->max_prediction_order; yading@10: } yading@10: if (s->options.max_prediction_order < s->options.min_prediction_order) { yading@10: av_log(avctx, AV_LOG_ERROR, "invalid prediction orders: min=%d max=%d\n", yading@10: s->options.min_prediction_order, s->options.max_prediction_order); yading@10: return AVERROR(EINVAL); yading@10: } yading@10: yading@10: if (avctx->frame_size > 0) { yading@10: if (avctx->frame_size < FLAC_MIN_BLOCKSIZE || yading@10: avctx->frame_size > FLAC_MAX_BLOCKSIZE) { yading@10: av_log(avctx, AV_LOG_ERROR, "invalid block size: %d\n", yading@10: avctx->frame_size); yading@10: return AVERROR(EINVAL); yading@10: } yading@10: } else { yading@10: s->avctx->frame_size = select_blocksize(s->samplerate, s->options.block_time_ms); yading@10: } yading@10: s->max_blocksize = s->avctx->frame_size; yading@10: yading@10: /* set maximum encoded frame size in verbatim mode */ yading@10: s->max_framesize = ff_flac_get_max_frame_size(s->avctx->frame_size, yading@10: s->channels, yading@10: s->avctx->bits_per_raw_sample); yading@10: yading@10: /* initialize MD5 context */ yading@10: s->md5ctx = av_md5_alloc(); yading@10: if (!s->md5ctx) yading@10: return AVERROR(ENOMEM); yading@10: av_md5_init(s->md5ctx); yading@10: yading@10: streaminfo = av_malloc(FLAC_STREAMINFO_SIZE); yading@10: if (!streaminfo) yading@10: return AVERROR(ENOMEM); yading@10: write_streaminfo(s, streaminfo); yading@10: avctx->extradata = streaminfo; yading@10: avctx->extradata_size = FLAC_STREAMINFO_SIZE; yading@10: yading@10: s->frame_count = 0; yading@10: s->min_framesize = s->max_framesize; yading@10: yading@10: if (channels == 3 && yading@10: avctx->channel_layout != (AV_CH_LAYOUT_STEREO|AV_CH_FRONT_CENTER) || yading@10: channels == 4 && yading@10: avctx->channel_layout != AV_CH_LAYOUT_2_2 && yading@10: avctx->channel_layout != AV_CH_LAYOUT_QUAD || yading@10: channels == 5 && yading@10: avctx->channel_layout != AV_CH_LAYOUT_5POINT0 && yading@10: avctx->channel_layout != AV_CH_LAYOUT_5POINT0_BACK || yading@10: channels == 6 && yading@10: avctx->channel_layout != AV_CH_LAYOUT_5POINT1 && yading@10: avctx->channel_layout != AV_CH_LAYOUT_5POINT1_BACK) { yading@10: if (avctx->channel_layout) { yading@10: av_log(avctx, AV_LOG_ERROR, "Channel layout not supported by Flac, " yading@10: "output stream will have incorrect " yading@10: "channel layout.\n"); yading@10: } else { yading@10: av_log(avctx, AV_LOG_WARNING, "No channel layout specified. The encoder " yading@10: "will use Flac channel layout for " yading@10: "%d channels.\n", channels); yading@10: } yading@10: } yading@10: yading@10: ret = ff_lpc_init(&s->lpc_ctx, avctx->frame_size, yading@10: s->options.max_prediction_order, FF_LPC_TYPE_LEVINSON); yading@10: yading@10: ff_dsputil_init(&s->dsp, avctx); yading@10: ff_flacdsp_init(&s->flac_dsp, avctx->sample_fmt, yading@10: avctx->bits_per_raw_sample); yading@10: yading@10: dprint_compression_options(s); yading@10: yading@10: return ret; yading@10: } yading@10: yading@10: yading@10: static void init_frame(FlacEncodeContext *s, int nb_samples) yading@10: { yading@10: int i, ch; yading@10: FlacFrame *frame; yading@10: yading@10: frame = &s->frame; yading@10: yading@10: for (i = 0; i < 16; i++) { yading@10: if (nb_samples == ff_flac_blocksize_table[i]) { yading@10: frame->blocksize = ff_flac_blocksize_table[i]; yading@10: frame->bs_code[0] = i; yading@10: frame->bs_code[1] = 0; yading@10: break; yading@10: } yading@10: } yading@10: if (i == 16) { yading@10: frame->blocksize = nb_samples; yading@10: if (frame->blocksize <= 256) { yading@10: frame->bs_code[0] = 6; yading@10: frame->bs_code[1] = frame->blocksize-1; yading@10: } else { yading@10: frame->bs_code[0] = 7; yading@10: frame->bs_code[1] = frame->blocksize-1; yading@10: } yading@10: } yading@10: yading@10: for (ch = 0; ch < s->channels; ch++) { yading@10: FlacSubframe *sub = &frame->subframes[ch]; yading@10: yading@10: sub->wasted = 0; yading@10: sub->obits = s->avctx->bits_per_raw_sample; yading@10: yading@10: if (sub->obits > 16) yading@10: sub->rc.coding_mode = CODING_MODE_RICE2; yading@10: else yading@10: sub->rc.coding_mode = CODING_MODE_RICE; yading@10: } yading@10: yading@10: frame->verbatim_only = 0; yading@10: } yading@10: yading@10: yading@10: /** yading@10: * Copy channel-interleaved input samples into separate subframes. yading@10: */ yading@10: static void copy_samples(FlacEncodeContext *s, const void *samples) yading@10: { yading@10: int i, j, ch; yading@10: FlacFrame *frame; yading@10: int shift = av_get_bytes_per_sample(s->avctx->sample_fmt) * 8 - yading@10: s->avctx->bits_per_raw_sample; yading@10: yading@10: #define COPY_SAMPLES(bits) do { \ yading@10: const int ## bits ## _t *samples0 = samples; \ yading@10: frame = &s->frame; \ yading@10: for (i = 0, j = 0; i < frame->blocksize; i++) \ yading@10: for (ch = 0; ch < s->channels; ch++, j++) \ yading@10: frame->subframes[ch].samples[i] = samples0[j] >> shift; \ yading@10: } while (0) yading@10: yading@10: if (s->avctx->sample_fmt == AV_SAMPLE_FMT_S16) yading@10: COPY_SAMPLES(16); yading@10: else yading@10: COPY_SAMPLES(32); yading@10: } yading@10: yading@10: yading@10: static uint64_t rice_count_exact(int32_t *res, int n, int k) yading@10: { yading@10: int i; yading@10: uint64_t count = 0; yading@10: yading@10: for (i = 0; i < n; i++) { yading@10: int32_t v = -2 * res[i] - 1; yading@10: v ^= v >> 31; yading@10: count += (v >> k) + 1 + k; yading@10: } yading@10: return count; yading@10: } yading@10: yading@10: yading@10: static uint64_t subframe_count_exact(FlacEncodeContext *s, FlacSubframe *sub, yading@10: int pred_order) yading@10: { yading@10: int p, porder, psize; yading@10: int i, part_end; yading@10: uint64_t count = 0; yading@10: yading@10: /* subframe header */ yading@10: count += 8; yading@10: yading@10: /* subframe */ yading@10: if (sub->type == FLAC_SUBFRAME_CONSTANT) { yading@10: count += sub->obits; yading@10: } else if (sub->type == FLAC_SUBFRAME_VERBATIM) { yading@10: count += s->frame.blocksize * sub->obits; yading@10: } else { yading@10: /* warm-up samples */ yading@10: count += pred_order * sub->obits; yading@10: yading@10: /* LPC coefficients */ yading@10: if (sub->type == FLAC_SUBFRAME_LPC) yading@10: count += 4 + 5 + pred_order * s->options.lpc_coeff_precision; yading@10: yading@10: /* rice-encoded block */ yading@10: count += 2; yading@10: yading@10: /* partition order */ yading@10: porder = sub->rc.porder; yading@10: psize = s->frame.blocksize >> porder; yading@10: count += 4; yading@10: yading@10: /* residual */ yading@10: i = pred_order; yading@10: part_end = psize; yading@10: for (p = 0; p < 1 << porder; p++) { yading@10: int k = sub->rc.params[p]; yading@10: count += sub->rc.coding_mode; yading@10: count += rice_count_exact(&sub->residual[i], part_end - i, k); yading@10: i = part_end; yading@10: part_end = FFMIN(s->frame.blocksize, part_end + psize); yading@10: } yading@10: } yading@10: yading@10: return count; yading@10: } yading@10: yading@10: yading@10: #define rice_encode_count(sum, n, k) (((n)*((k)+1))+((sum-(n>>1))>>(k))) yading@10: yading@10: /** yading@10: * Solve for d/dk(rice_encode_count) = n-((sum-(n>>1))>>(k+1)) = 0. yading@10: */ yading@10: static int find_optimal_param(uint64_t sum, int n, int max_param) yading@10: { yading@10: int k; yading@10: uint64_t sum2; yading@10: yading@10: if (sum <= n >> 1) yading@10: return 0; yading@10: sum2 = sum - (n >> 1); yading@10: k = av_log2(av_clipl_int32(sum2 / n)); yading@10: return FFMIN(k, max_param); yading@10: } yading@10: yading@10: yading@10: static uint64_t calc_optimal_rice_params(RiceContext *rc, int porder, yading@10: uint64_t *sums, int n, int pred_order) yading@10: { yading@10: int i; yading@10: int k, cnt, part, max_param; yading@10: uint64_t all_bits; yading@10: yading@10: max_param = (1 << rc->coding_mode) - 2; yading@10: yading@10: part = (1 << porder); yading@10: all_bits = 4 * part; yading@10: yading@10: cnt = (n >> porder) - pred_order; yading@10: for (i = 0; i < part; i++) { yading@10: k = find_optimal_param(sums[i], cnt, max_param); yading@10: rc->params[i] = k; yading@10: all_bits += rice_encode_count(sums[i], cnt, k); yading@10: cnt = n >> porder; yading@10: } yading@10: yading@10: rc->porder = porder; yading@10: yading@10: return all_bits; yading@10: } yading@10: yading@10: yading@10: static void calc_sums(int pmin, int pmax, uint32_t *data, int n, int pred_order, yading@10: uint64_t sums[][MAX_PARTITIONS]) yading@10: { yading@10: int i, j; yading@10: int parts; yading@10: uint32_t *res, *res_end; yading@10: yading@10: /* sums for highest level */ yading@10: parts = (1 << pmax); yading@10: res = &data[pred_order]; yading@10: res_end = &data[n >> pmax]; yading@10: for (i = 0; i < parts; i++) { yading@10: uint64_t sum = 0; yading@10: while (res < res_end) yading@10: sum += *(res++); yading@10: sums[pmax][i] = sum; yading@10: res_end += n >> pmax; yading@10: } yading@10: /* sums for lower levels */ yading@10: for (i = pmax - 1; i >= pmin; i--) { yading@10: parts = (1 << i); yading@10: for (j = 0; j < parts; j++) yading@10: sums[i][j] = sums[i+1][2*j] + sums[i+1][2*j+1]; yading@10: } yading@10: } yading@10: yading@10: yading@10: static uint64_t calc_rice_params(RiceContext *rc, int pmin, int pmax, yading@10: int32_t *data, int n, int pred_order) yading@10: { yading@10: int i; yading@10: uint64_t bits[MAX_PARTITION_ORDER+1]; yading@10: int opt_porder; yading@10: RiceContext tmp_rc; yading@10: uint32_t *udata; yading@10: uint64_t sums[MAX_PARTITION_ORDER+1][MAX_PARTITIONS]; yading@10: yading@10: av_assert1(pmin >= 0 && pmin <= MAX_PARTITION_ORDER); yading@10: av_assert1(pmax >= 0 && pmax <= MAX_PARTITION_ORDER); yading@10: av_assert1(pmin <= pmax); yading@10: yading@10: tmp_rc.coding_mode = rc->coding_mode; yading@10: yading@10: udata = av_malloc(n * sizeof(uint32_t)); yading@10: for (i = 0; i < n; i++) yading@10: udata[i] = (2*data[i]) ^ (data[i]>>31); yading@10: yading@10: calc_sums(pmin, pmax, udata, n, pred_order, sums); yading@10: yading@10: opt_porder = pmin; yading@10: bits[pmin] = UINT32_MAX; yading@10: for (i = pmin; i <= pmax; i++) { yading@10: bits[i] = calc_optimal_rice_params(&tmp_rc, i, sums[i], n, pred_order); yading@10: if (bits[i] <= bits[opt_porder]) { yading@10: opt_porder = i; yading@10: *rc = tmp_rc; yading@10: } yading@10: } yading@10: yading@10: av_freep(&udata); yading@10: return bits[opt_porder]; yading@10: } yading@10: yading@10: yading@10: static int get_max_p_order(int max_porder, int n, int order) yading@10: { yading@10: int porder = FFMIN(max_porder, av_log2(n^(n-1))); yading@10: if (order > 0) yading@10: porder = FFMIN(porder, av_log2(n/order)); yading@10: return porder; yading@10: } yading@10: yading@10: yading@10: static uint64_t find_subframe_rice_params(FlacEncodeContext *s, yading@10: FlacSubframe *sub, int pred_order) yading@10: { yading@10: int pmin = get_max_p_order(s->options.min_partition_order, yading@10: s->frame.blocksize, pred_order); yading@10: int pmax = get_max_p_order(s->options.max_partition_order, yading@10: s->frame.blocksize, pred_order); yading@10: yading@10: uint64_t bits = 8 + pred_order * sub->obits + 2 + sub->rc.coding_mode; yading@10: if (sub->type == FLAC_SUBFRAME_LPC) yading@10: bits += 4 + 5 + pred_order * s->options.lpc_coeff_precision; yading@10: bits += calc_rice_params(&sub->rc, pmin, pmax, sub->residual, yading@10: s->frame.blocksize, pred_order); yading@10: return bits; yading@10: } yading@10: yading@10: yading@10: static void encode_residual_fixed(int32_t *res, const int32_t *smp, int n, yading@10: int order) yading@10: { yading@10: int i; yading@10: yading@10: for (i = 0; i < order; i++) yading@10: res[i] = smp[i]; yading@10: yading@10: if (order == 0) { yading@10: for (i = order; i < n; i++) yading@10: res[i] = smp[i]; yading@10: } else if (order == 1) { yading@10: for (i = order; i < n; i++) yading@10: res[i] = smp[i] - smp[i-1]; yading@10: } else if (order == 2) { yading@10: int a = smp[order-1] - smp[order-2]; yading@10: for (i = order; i < n; i += 2) { yading@10: int b = smp[i ] - smp[i-1]; yading@10: res[i] = b - a; yading@10: a = smp[i+1] - smp[i ]; yading@10: res[i+1] = a - b; yading@10: } yading@10: } else if (order == 3) { yading@10: int a = smp[order-1] - smp[order-2]; yading@10: int c = smp[order-1] - 2*smp[order-2] + smp[order-3]; yading@10: for (i = order; i < n; i += 2) { yading@10: int b = smp[i ] - smp[i-1]; yading@10: int d = b - a; yading@10: res[i] = d - c; yading@10: a = smp[i+1] - smp[i ]; yading@10: c = a - b; yading@10: res[i+1] = c - d; yading@10: } yading@10: } else { yading@10: int a = smp[order-1] - smp[order-2]; yading@10: int c = smp[order-1] - 2*smp[order-2] + smp[order-3]; yading@10: int e = smp[order-1] - 3*smp[order-2] + 3*smp[order-3] - smp[order-4]; yading@10: for (i = order; i < n; i += 2) { yading@10: int b = smp[i ] - smp[i-1]; yading@10: int d = b - a; yading@10: int f = d - c; yading@10: res[i ] = f - e; yading@10: a = smp[i+1] - smp[i ]; yading@10: c = a - b; yading@10: e = c - d; yading@10: res[i+1] = e - f; yading@10: } yading@10: } yading@10: } yading@10: yading@10: yading@10: static int encode_residual_ch(FlacEncodeContext *s, int ch) yading@10: { yading@10: int i, n; yading@10: int min_order, max_order, opt_order, omethod; yading@10: FlacFrame *frame; yading@10: FlacSubframe *sub; yading@10: int32_t coefs[MAX_LPC_ORDER][MAX_LPC_ORDER]; yading@10: int shift[MAX_LPC_ORDER]; yading@10: int32_t *res, *smp; yading@10: yading@10: frame = &s->frame; yading@10: sub = &frame->subframes[ch]; yading@10: res = sub->residual; yading@10: smp = sub->samples; yading@10: n = frame->blocksize; yading@10: yading@10: /* CONSTANT */ yading@10: for (i = 1; i < n; i++) yading@10: if(smp[i] != smp[0]) yading@10: break; yading@10: if (i == n) { yading@10: sub->type = sub->type_code = FLAC_SUBFRAME_CONSTANT; yading@10: res[0] = smp[0]; yading@10: return subframe_count_exact(s, sub, 0); yading@10: } yading@10: yading@10: /* VERBATIM */ yading@10: if (frame->verbatim_only || n < 5) { yading@10: sub->type = sub->type_code = FLAC_SUBFRAME_VERBATIM; yading@10: memcpy(res, smp, n * sizeof(int32_t)); yading@10: return subframe_count_exact(s, sub, 0); yading@10: } yading@10: yading@10: min_order = s->options.min_prediction_order; yading@10: max_order = s->options.max_prediction_order; yading@10: omethod = s->options.prediction_order_method; yading@10: yading@10: /* FIXED */ yading@10: sub->type = FLAC_SUBFRAME_FIXED; yading@10: if (s->options.lpc_type == FF_LPC_TYPE_NONE || yading@10: s->options.lpc_type == FF_LPC_TYPE_FIXED || n <= max_order) { yading@10: uint64_t bits[MAX_FIXED_ORDER+1]; yading@10: if (max_order > MAX_FIXED_ORDER) yading@10: max_order = MAX_FIXED_ORDER; yading@10: opt_order = 0; yading@10: bits[0] = UINT32_MAX; yading@10: for (i = min_order; i <= max_order; i++) { yading@10: encode_residual_fixed(res, smp, n, i); yading@10: bits[i] = find_subframe_rice_params(s, sub, i); yading@10: if (bits[i] < bits[opt_order]) yading@10: opt_order = i; yading@10: } yading@10: sub->order = opt_order; yading@10: sub->type_code = sub->type | sub->order; yading@10: if (sub->order != max_order) { yading@10: encode_residual_fixed(res, smp, n, sub->order); yading@10: find_subframe_rice_params(s, sub, sub->order); yading@10: } yading@10: return subframe_count_exact(s, sub, sub->order); yading@10: } yading@10: yading@10: /* LPC */ yading@10: sub->type = FLAC_SUBFRAME_LPC; yading@10: opt_order = ff_lpc_calc_coefs(&s->lpc_ctx, smp, n, min_order, max_order, yading@10: s->options.lpc_coeff_precision, coefs, shift, s->options.lpc_type, yading@10: s->options.lpc_passes, omethod, yading@10: MAX_LPC_SHIFT, 0); yading@10: yading@10: if (omethod == ORDER_METHOD_2LEVEL || yading@10: omethod == ORDER_METHOD_4LEVEL || yading@10: omethod == ORDER_METHOD_8LEVEL) { yading@10: int levels = 1 << omethod; yading@10: uint64_t bits[1 << ORDER_METHOD_8LEVEL]; yading@10: int order = -1; yading@10: int opt_index = levels-1; yading@10: opt_order = max_order-1; yading@10: bits[opt_index] = UINT32_MAX; yading@10: for (i = levels-1; i >= 0; i--) { yading@10: int last_order = order; yading@10: order = min_order + (((max_order-min_order+1) * (i+1)) / levels)-1; yading@10: order = av_clip(order, min_order - 1, max_order - 1); yading@10: if (order == last_order) yading@10: continue; yading@10: s->flac_dsp.lpc_encode(res, smp, n, order+1, coefs[order], yading@10: shift[order]); yading@10: bits[i] = find_subframe_rice_params(s, sub, order+1); yading@10: if (bits[i] < bits[opt_index]) { yading@10: opt_index = i; yading@10: opt_order = order; yading@10: } yading@10: } yading@10: opt_order++; yading@10: } else if (omethod == ORDER_METHOD_SEARCH) { yading@10: // brute-force optimal order search yading@10: uint64_t bits[MAX_LPC_ORDER]; yading@10: opt_order = 0; yading@10: bits[0] = UINT32_MAX; yading@10: for (i = min_order-1; i < max_order; i++) { yading@10: s->flac_dsp.lpc_encode(res, smp, n, i+1, coefs[i], shift[i]); yading@10: bits[i] = find_subframe_rice_params(s, sub, i+1); yading@10: if (bits[i] < bits[opt_order]) yading@10: opt_order = i; yading@10: } yading@10: opt_order++; yading@10: } else if (omethod == ORDER_METHOD_LOG) { yading@10: uint64_t bits[MAX_LPC_ORDER]; yading@10: int step; yading@10: yading@10: opt_order = min_order - 1 + (max_order-min_order)/3; yading@10: memset(bits, -1, sizeof(bits)); yading@10: yading@10: for (step = 16; step; step >>= 1) { yading@10: int last = opt_order; yading@10: for (i = last-step; i <= last+step; i += step) { yading@10: if (i < min_order-1 || i >= max_order || bits[i] < UINT32_MAX) yading@10: continue; yading@10: s->flac_dsp.lpc_encode(res, smp, n, i+1, coefs[i], shift[i]); yading@10: bits[i] = find_subframe_rice_params(s, sub, i+1); yading@10: if (bits[i] < bits[opt_order]) yading@10: opt_order = i; yading@10: } yading@10: } yading@10: opt_order++; yading@10: } yading@10: yading@10: sub->order = opt_order; yading@10: sub->type_code = sub->type | (sub->order-1); yading@10: sub->shift = shift[sub->order-1]; yading@10: for (i = 0; i < sub->order; i++) yading@10: sub->coefs[i] = coefs[sub->order-1][i]; yading@10: yading@10: s->flac_dsp.lpc_encode(res, smp, n, sub->order, sub->coefs, sub->shift); yading@10: yading@10: find_subframe_rice_params(s, sub, sub->order); yading@10: yading@10: return subframe_count_exact(s, sub, sub->order); yading@10: } yading@10: yading@10: yading@10: static int count_frame_header(FlacEncodeContext *s) yading@10: { yading@10: uint8_t av_unused tmp; yading@10: int count; yading@10: yading@10: /* yading@10: <14> Sync code yading@10: <1> Reserved yading@10: <1> Blocking strategy yading@10: <4> Block size in inter-channel samples yading@10: <4> Sample rate yading@10: <4> Channel assignment yading@10: <3> Sample size in bits yading@10: <1> Reserved yading@10: */ yading@10: count = 32; yading@10: yading@10: /* coded frame number */ yading@10: PUT_UTF8(s->frame_count, tmp, count += 8;) yading@10: yading@10: /* explicit block size */ yading@10: if (s->frame.bs_code[0] == 6) yading@10: count += 8; yading@10: else if (s->frame.bs_code[0] == 7) yading@10: count += 16; yading@10: yading@10: /* explicit sample rate */ yading@10: count += ((s->sr_code[0] == 12) + (s->sr_code[0] > 12)) * 8; yading@10: yading@10: /* frame header CRC-8 */ yading@10: count += 8; yading@10: yading@10: return count; yading@10: } yading@10: yading@10: yading@10: static int encode_frame(FlacEncodeContext *s) yading@10: { yading@10: int ch; yading@10: uint64_t count; yading@10: yading@10: count = count_frame_header(s); yading@10: yading@10: for (ch = 0; ch < s->channels; ch++) yading@10: count += encode_residual_ch(s, ch); yading@10: yading@10: count += (8 - (count & 7)) & 7; // byte alignment yading@10: count += 16; // CRC-16 yading@10: yading@10: count >>= 3; yading@10: if (count > INT_MAX) yading@10: return AVERROR_BUG; yading@10: return count; yading@10: } yading@10: yading@10: yading@10: static void remove_wasted_bits(FlacEncodeContext *s) yading@10: { yading@10: int ch, i; yading@10: yading@10: for (ch = 0; ch < s->channels; ch++) { yading@10: FlacSubframe *sub = &s->frame.subframes[ch]; yading@10: int32_t v = 0; yading@10: yading@10: for (i = 0; i < s->frame.blocksize; i++) { yading@10: v |= sub->samples[i]; yading@10: if (v & 1) yading@10: break; yading@10: } yading@10: yading@10: if (v && !(v & 1)) { yading@10: v = av_ctz(v); yading@10: yading@10: for (i = 0; i < s->frame.blocksize; i++) yading@10: sub->samples[i] >>= v; yading@10: yading@10: sub->wasted = v; yading@10: sub->obits -= v; yading@10: yading@10: /* for 24-bit, check if removing wasted bits makes the range better yading@10: suited for using RICE instead of RICE2 for entropy coding */ yading@10: if (sub->obits <= 17) yading@10: sub->rc.coding_mode = CODING_MODE_RICE; yading@10: } yading@10: } yading@10: } yading@10: yading@10: yading@10: static int estimate_stereo_mode(int32_t *left_ch, int32_t *right_ch, int n, yading@10: int max_rice_param) yading@10: { yading@10: int i, best; yading@10: int32_t lt, rt; yading@10: uint64_t sum[4]; yading@10: uint64_t score[4]; yading@10: int k; yading@10: yading@10: /* calculate sum of 2nd order residual for each channel */ yading@10: sum[0] = sum[1] = sum[2] = sum[3] = 0; yading@10: for (i = 2; i < n; i++) { yading@10: lt = left_ch[i] - 2*left_ch[i-1] + left_ch[i-2]; yading@10: rt = right_ch[i] - 2*right_ch[i-1] + right_ch[i-2]; yading@10: sum[2] += FFABS((lt + rt) >> 1); yading@10: sum[3] += FFABS(lt - rt); yading@10: sum[0] += FFABS(lt); yading@10: sum[1] += FFABS(rt); yading@10: } yading@10: /* estimate bit counts */ yading@10: for (i = 0; i < 4; i++) { yading@10: k = find_optimal_param(2 * sum[i], n, max_rice_param); yading@10: sum[i] = rice_encode_count( 2 * sum[i], n, k); yading@10: } yading@10: yading@10: /* calculate score for each mode */ yading@10: score[0] = sum[0] + sum[1]; yading@10: score[1] = sum[0] + sum[3]; yading@10: score[2] = sum[1] + sum[3]; yading@10: score[3] = sum[2] + sum[3]; yading@10: yading@10: /* return mode with lowest score */ yading@10: best = 0; yading@10: for (i = 1; i < 4; i++) yading@10: if (score[i] < score[best]) yading@10: best = i; yading@10: yading@10: return best; yading@10: } yading@10: yading@10: yading@10: /** yading@10: * Perform stereo channel decorrelation. yading@10: */ yading@10: static void channel_decorrelation(FlacEncodeContext *s) yading@10: { yading@10: FlacFrame *frame; yading@10: int32_t *left, *right; yading@10: int i, n; yading@10: yading@10: frame = &s->frame; yading@10: n = frame->blocksize; yading@10: left = frame->subframes[0].samples; yading@10: right = frame->subframes[1].samples; yading@10: yading@10: if (s->channels != 2) { yading@10: frame->ch_mode = FLAC_CHMODE_INDEPENDENT; yading@10: return; yading@10: } yading@10: yading@10: if (s->options.ch_mode < 0) { yading@10: int max_rice_param = (1 << frame->subframes[0].rc.coding_mode) - 2; yading@10: frame->ch_mode = estimate_stereo_mode(left, right, n, max_rice_param); yading@10: } else yading@10: frame->ch_mode = s->options.ch_mode; yading@10: yading@10: /* perform decorrelation and adjust bits-per-sample */ yading@10: if (frame->ch_mode == FLAC_CHMODE_INDEPENDENT) yading@10: return; yading@10: if (frame->ch_mode == FLAC_CHMODE_MID_SIDE) { yading@10: int32_t tmp; yading@10: for (i = 0; i < n; i++) { yading@10: tmp = left[i]; yading@10: left[i] = (tmp + right[i]) >> 1; yading@10: right[i] = tmp - right[i]; yading@10: } yading@10: frame->subframes[1].obits++; yading@10: } else if (frame->ch_mode == FLAC_CHMODE_LEFT_SIDE) { yading@10: for (i = 0; i < n; i++) yading@10: right[i] = left[i] - right[i]; yading@10: frame->subframes[1].obits++; yading@10: } else { yading@10: for (i = 0; i < n; i++) yading@10: left[i] -= right[i]; yading@10: frame->subframes[0].obits++; yading@10: } yading@10: } yading@10: yading@10: yading@10: static void write_utf8(PutBitContext *pb, uint32_t val) yading@10: { yading@10: uint8_t tmp; yading@10: PUT_UTF8(val, tmp, put_bits(pb, 8, tmp);) yading@10: } yading@10: yading@10: yading@10: static void write_frame_header(FlacEncodeContext *s) yading@10: { yading@10: FlacFrame *frame; yading@10: int crc; yading@10: yading@10: frame = &s->frame; yading@10: yading@10: put_bits(&s->pb, 16, 0xFFF8); yading@10: put_bits(&s->pb, 4, frame->bs_code[0]); yading@10: put_bits(&s->pb, 4, s->sr_code[0]); yading@10: yading@10: if (frame->ch_mode == FLAC_CHMODE_INDEPENDENT) yading@10: put_bits(&s->pb, 4, s->channels-1); yading@10: else yading@10: put_bits(&s->pb, 4, frame->ch_mode + FLAC_MAX_CHANNELS - 1); yading@10: yading@10: put_bits(&s->pb, 3, s->bps_code); yading@10: put_bits(&s->pb, 1, 0); yading@10: write_utf8(&s->pb, s->frame_count); yading@10: yading@10: if (frame->bs_code[0] == 6) yading@10: put_bits(&s->pb, 8, frame->bs_code[1]); yading@10: else if (frame->bs_code[0] == 7) yading@10: put_bits(&s->pb, 16, frame->bs_code[1]); yading@10: yading@10: if (s->sr_code[0] == 12) yading@10: put_bits(&s->pb, 8, s->sr_code[1]); yading@10: else if (s->sr_code[0] > 12) yading@10: put_bits(&s->pb, 16, s->sr_code[1]); yading@10: yading@10: flush_put_bits(&s->pb); yading@10: crc = av_crc(av_crc_get_table(AV_CRC_8_ATM), 0, s->pb.buf, yading@10: put_bits_count(&s->pb) >> 3); yading@10: put_bits(&s->pb, 8, crc); yading@10: } yading@10: yading@10: yading@10: static void write_subframes(FlacEncodeContext *s) yading@10: { yading@10: int ch; yading@10: yading@10: for (ch = 0; ch < s->channels; ch++) { yading@10: FlacSubframe *sub = &s->frame.subframes[ch]; yading@10: int i, p, porder, psize; yading@10: int32_t *part_end; yading@10: int32_t *res = sub->residual; yading@10: int32_t *frame_end = &sub->residual[s->frame.blocksize]; yading@10: yading@10: /* subframe header */ yading@10: put_bits(&s->pb, 1, 0); yading@10: put_bits(&s->pb, 6, sub->type_code); yading@10: put_bits(&s->pb, 1, !!sub->wasted); yading@10: if (sub->wasted) yading@10: put_bits(&s->pb, sub->wasted, 1); yading@10: yading@10: /* subframe */ yading@10: if (sub->type == FLAC_SUBFRAME_CONSTANT) { yading@10: put_sbits(&s->pb, sub->obits, res[0]); yading@10: } else if (sub->type == FLAC_SUBFRAME_VERBATIM) { yading@10: while (res < frame_end) yading@10: put_sbits(&s->pb, sub->obits, *res++); yading@10: } else { yading@10: /* warm-up samples */ yading@10: for (i = 0; i < sub->order; i++) yading@10: put_sbits(&s->pb, sub->obits, *res++); yading@10: yading@10: /* LPC coefficients */ yading@10: if (sub->type == FLAC_SUBFRAME_LPC) { yading@10: int cbits = s->options.lpc_coeff_precision; yading@10: put_bits( &s->pb, 4, cbits-1); yading@10: put_sbits(&s->pb, 5, sub->shift); yading@10: for (i = 0; i < sub->order; i++) yading@10: put_sbits(&s->pb, cbits, sub->coefs[i]); yading@10: } yading@10: yading@10: /* rice-encoded block */ yading@10: put_bits(&s->pb, 2, sub->rc.coding_mode - 4); yading@10: yading@10: /* partition order */ yading@10: porder = sub->rc.porder; yading@10: psize = s->frame.blocksize >> porder; yading@10: put_bits(&s->pb, 4, porder); yading@10: yading@10: /* residual */ yading@10: part_end = &sub->residual[psize]; yading@10: for (p = 0; p < 1 << porder; p++) { yading@10: int k = sub->rc.params[p]; yading@10: put_bits(&s->pb, sub->rc.coding_mode, k); yading@10: while (res < part_end) yading@10: set_sr_golomb_flac(&s->pb, *res++, k, INT32_MAX, 0); yading@10: part_end = FFMIN(frame_end, part_end + psize); yading@10: } yading@10: } yading@10: } yading@10: } yading@10: yading@10: yading@10: static void write_frame_footer(FlacEncodeContext *s) yading@10: { yading@10: int crc; yading@10: flush_put_bits(&s->pb); yading@10: crc = av_bswap16(av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0, s->pb.buf, yading@10: put_bits_count(&s->pb)>>3)); yading@10: put_bits(&s->pb, 16, crc); yading@10: flush_put_bits(&s->pb); yading@10: } yading@10: yading@10: yading@10: static int write_frame(FlacEncodeContext *s, AVPacket *avpkt) yading@10: { yading@10: init_put_bits(&s->pb, avpkt->data, avpkt->size); yading@10: write_frame_header(s); yading@10: write_subframes(s); yading@10: write_frame_footer(s); yading@10: return put_bits_count(&s->pb) >> 3; yading@10: } yading@10: yading@10: yading@10: static int update_md5_sum(FlacEncodeContext *s, const void *samples) yading@10: { yading@10: const uint8_t *buf; yading@10: int buf_size = s->frame.blocksize * s->channels * yading@10: ((s->avctx->bits_per_raw_sample + 7) / 8); yading@10: yading@10: if (s->avctx->bits_per_raw_sample > 16 || HAVE_BIGENDIAN) { yading@10: av_fast_malloc(&s->md5_buffer, &s->md5_buffer_size, buf_size); yading@10: if (!s->md5_buffer) yading@10: return AVERROR(ENOMEM); yading@10: } yading@10: yading@10: if (s->avctx->bits_per_raw_sample <= 16) { yading@10: buf = (const uint8_t *)samples; yading@10: #if HAVE_BIGENDIAN yading@10: s->dsp.bswap16_buf((uint16_t *)s->md5_buffer, yading@10: (const uint16_t *)samples, buf_size / 2); yading@10: buf = s->md5_buffer; yading@10: #endif yading@10: } else { yading@10: int i; yading@10: const int32_t *samples0 = samples; yading@10: uint8_t *tmp = s->md5_buffer; yading@10: yading@10: for (i = 0; i < s->frame.blocksize * s->channels; i++) { yading@10: int32_t v = samples0[i] >> 8; yading@10: *tmp++ = (v ) & 0xFF; yading@10: *tmp++ = (v >> 8) & 0xFF; yading@10: *tmp++ = (v >> 16) & 0xFF; yading@10: } yading@10: buf = s->md5_buffer; yading@10: } yading@10: av_md5_update(s->md5ctx, buf, buf_size); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: yading@10: static int flac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, yading@10: const AVFrame *frame, int *got_packet_ptr) yading@10: { yading@10: FlacEncodeContext *s; yading@10: int frame_bytes, out_bytes, ret; yading@10: yading@10: s = avctx->priv_data; yading@10: yading@10: /* when the last block is reached, update the header in extradata */ yading@10: if (!frame) { yading@10: s->max_framesize = s->max_encoded_framesize; yading@10: av_md5_final(s->md5ctx, s->md5sum); yading@10: write_streaminfo(s, avctx->extradata); yading@10: return 0; yading@10: } yading@10: yading@10: /* change max_framesize for small final frame */ yading@10: if (frame->nb_samples < s->frame.blocksize) { yading@10: s->max_framesize = ff_flac_get_max_frame_size(frame->nb_samples, yading@10: s->channels, yading@10: avctx->bits_per_raw_sample); yading@10: } yading@10: yading@10: init_frame(s, frame->nb_samples); yading@10: yading@10: copy_samples(s, frame->data[0]); yading@10: yading@10: channel_decorrelation(s); yading@10: yading@10: remove_wasted_bits(s); yading@10: yading@10: frame_bytes = encode_frame(s); yading@10: yading@10: /* fallback to verbatim mode if the compressed frame is larger than it yading@10: would be if encoded uncompressed. */ yading@10: if (frame_bytes < 0 || frame_bytes > s->max_framesize) { yading@10: s->frame.verbatim_only = 1; yading@10: frame_bytes = encode_frame(s); yading@10: if (frame_bytes < 0) { yading@10: av_log(avctx, AV_LOG_ERROR, "Bad frame count\n"); yading@10: return frame_bytes; yading@10: } yading@10: } yading@10: yading@10: if ((ret = ff_alloc_packet2(avctx, avpkt, frame_bytes)) < 0) yading@10: return ret; yading@10: yading@10: out_bytes = write_frame(s, avpkt); yading@10: yading@10: s->frame_count++; yading@10: s->sample_count += frame->nb_samples; yading@10: if ((ret = update_md5_sum(s, frame->data[0])) < 0) { yading@10: av_log(avctx, AV_LOG_ERROR, "Error updating MD5 checksum\n"); yading@10: return ret; yading@10: } yading@10: if (out_bytes > s->max_encoded_framesize) yading@10: s->max_encoded_framesize = out_bytes; yading@10: if (out_bytes < s->min_framesize) yading@10: s->min_framesize = out_bytes; yading@10: yading@10: avpkt->pts = frame->pts; yading@10: avpkt->duration = ff_samples_to_time_base(avctx, frame->nb_samples); yading@10: avpkt->size = out_bytes; yading@10: *got_packet_ptr = 1; yading@10: return 0; yading@10: } yading@10: yading@10: yading@10: static av_cold int flac_encode_close(AVCodecContext *avctx) yading@10: { yading@10: if (avctx->priv_data) { yading@10: FlacEncodeContext *s = avctx->priv_data; yading@10: av_freep(&s->md5ctx); yading@10: av_freep(&s->md5_buffer); yading@10: ff_lpc_end(&s->lpc_ctx); yading@10: } yading@10: av_freep(&avctx->extradata); yading@10: avctx->extradata_size = 0; yading@10: return 0; yading@10: } yading@10: yading@10: #define FLAGS AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM yading@10: static const AVOption options[] = { yading@10: { "lpc_coeff_precision", "LPC coefficient precision", offsetof(FlacEncodeContext, options.lpc_coeff_precision), AV_OPT_TYPE_INT, {.i64 = 15 }, 0, MAX_LPC_PRECISION, FLAGS }, yading@10: { "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" }, yading@10: { "none", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_NONE }, INT_MIN, INT_MAX, FLAGS, "lpc_type" }, yading@10: { "fixed", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_FIXED }, INT_MIN, INT_MAX, FLAGS, "lpc_type" }, yading@10: { "levinson", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_LEVINSON }, INT_MIN, INT_MAX, FLAGS, "lpc_type" }, yading@10: { "cholesky", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_CHOLESKY }, INT_MIN, INT_MAX, FLAGS, "lpc_type" }, yading@10: { "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 }, yading@10: { "min_partition_order", NULL, offsetof(FlacEncodeContext, options.min_partition_order), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, MAX_PARTITION_ORDER, FLAGS }, yading@10: { "max_partition_order", NULL, offsetof(FlacEncodeContext, options.max_partition_order), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, MAX_PARTITION_ORDER, FLAGS }, yading@10: { "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" }, yading@10: { "estimation", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_EST }, INT_MIN, INT_MAX, FLAGS, "predm" }, yading@10: { "2level", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_2LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" }, yading@10: { "4level", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_4LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" }, yading@10: { "8level", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_8LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" }, yading@10: { "search", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_SEARCH }, INT_MIN, INT_MAX, FLAGS, "predm" }, yading@10: { "log", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_LOG }, INT_MIN, INT_MAX, FLAGS, "predm" }, yading@10: { "ch_mode", "Stereo decorrelation mode", offsetof(FlacEncodeContext, options.ch_mode), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, FLAC_CHMODE_MID_SIDE, FLAGS, "ch_mode" }, yading@10: { "auto", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = -1 }, INT_MIN, INT_MAX, FLAGS, "ch_mode" }, yading@10: { "indep", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_INDEPENDENT }, INT_MIN, INT_MAX, FLAGS, "ch_mode" }, yading@10: { "left_side", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_LEFT_SIDE }, INT_MIN, INT_MAX, FLAGS, "ch_mode" }, yading@10: { "right_side", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_RIGHT_SIDE }, INT_MIN, INT_MAX, FLAGS, "ch_mode" }, yading@10: { "mid_side", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_MID_SIDE }, INT_MIN, INT_MAX, FLAGS, "ch_mode" }, yading@10: { NULL }, yading@10: }; yading@10: yading@10: static const AVClass flac_encoder_class = { yading@10: "FLAC encoder", yading@10: av_default_item_name, yading@10: options, yading@10: LIBAVUTIL_VERSION_INT, yading@10: }; yading@10: yading@10: AVCodec ff_flac_encoder = { yading@10: .name = "flac", yading@10: .type = AVMEDIA_TYPE_AUDIO, yading@10: .id = AV_CODEC_ID_FLAC, yading@10: .priv_data_size = sizeof(FlacEncodeContext), yading@10: .init = flac_encode_init, yading@10: .encode2 = flac_encode_frame, yading@10: .close = flac_encode_close, yading@10: .capabilities = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY | CODEC_CAP_LOSSLESS, yading@10: .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16, yading@10: AV_SAMPLE_FMT_S32, yading@10: AV_SAMPLE_FMT_NONE }, yading@10: .long_name = NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"), yading@10: .priv_class = &flac_encoder_class, yading@10: };