| /* |
| * FLAC audio encoder |
| * Copyright (c) 2006 Justin Ruggles <justin.ruggles@gmail.com> |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "libavutil/avassert.h" |
| #include "libavutil/channel_layout.h" |
| #include "libavutil/crc.h" |
| #include "libavutil/intmath.h" |
| #include "libavutil/md5.h" |
| #include "libavutil/mem.h" |
| #include "libavutil/opt.h" |
| |
| #include "avcodec.h" |
| #include "bswapdsp.h" |
| #include "codec_internal.h" |
| #include "encode.h" |
| #include "put_bits.h" |
| #include "lpc.h" |
| #include "flac.h" |
| #include "flacdata.h" |
| #include "flacencdsp.h" |
| |
| #define FLAC_SUBFRAME_CONSTANT 0 |
| #define FLAC_SUBFRAME_VERBATIM 1 |
| #define FLAC_SUBFRAME_FIXED 8 |
| #define FLAC_SUBFRAME_LPC 32 |
| |
| #define MAX_FIXED_ORDER 4 |
| #define MAX_PARTITION_ORDER 8 |
| #define MAX_PARTITIONS (1 << MAX_PARTITION_ORDER) |
| #define MAX_LPC_PRECISION 15 |
| #define MIN_LPC_SHIFT 0 |
| #define MAX_LPC_SHIFT 15 |
| |
| enum CodingMode { |
| CODING_MODE_RICE = 4, |
| CODING_MODE_RICE2 = 5, |
| }; |
| |
| typedef struct CompressionOptions { |
| int compression_level; |
| int block_time_ms; |
| enum FFLPCType lpc_type; |
| int lpc_passes; |
| int lpc_coeff_precision; |
| int min_prediction_order; |
| int max_prediction_order; |
| int prediction_order_method; |
| int min_partition_order; |
| int max_partition_order; |
| int ch_mode; |
| int exact_rice_parameters; |
| int multi_dim_quant; |
| } CompressionOptions; |
| |
| typedef struct RiceContext { |
| enum CodingMode coding_mode; |
| int porder; |
| int params[MAX_PARTITIONS]; |
| } RiceContext; |
| |
| typedef struct FlacSubframe { |
| int type; |
| int type_code; |
| int obits; |
| int wasted; |
| int order; |
| int32_t coefs[MAX_LPC_ORDER]; |
| int shift; |
| |
| RiceContext rc; |
| uint32_t rc_udata[FLAC_MAX_BLOCKSIZE]; |
| uint64_t rc_sums[32][MAX_PARTITIONS]; |
| |
| int32_t samples[FLAC_MAX_BLOCKSIZE]; |
| int32_t residual[FLAC_MAX_BLOCKSIZE+11]; |
| } FlacSubframe; |
| |
| typedef struct FlacFrame { |
| FlacSubframe subframes[FLAC_MAX_CHANNELS]; |
| int64_t samples_33bps[FLAC_MAX_BLOCKSIZE]; |
| int blocksize; |
| int bs_code[2]; |
| uint8_t crc8; |
| int ch_mode; |
| int verbatim_only; |
| } FlacFrame; |
| |
| typedef struct FlacEncodeContext { |
| AVClass *class; |
| PutBitContext pb; |
| int channels; |
| int samplerate; |
| int sr_code[2]; |
| int bps_code; |
| int max_blocksize; |
| int min_framesize; |
| int max_framesize; |
| int max_encoded_framesize; |
| uint32_t frame_count; |
| uint64_t sample_count; |
| uint8_t md5sum[16]; |
| FlacFrame frame; |
| CompressionOptions options; |
| AVCodecContext *avctx; |
| LPCContext lpc_ctx; |
| struct AVMD5 *md5ctx; |
| uint8_t *md5_buffer; |
| unsigned int md5_buffer_size; |
| BswapDSPContext bdsp; |
| FLACEncDSPContext flac_dsp; |
| |
| int flushed; |
| int64_t next_pts; |
| } FlacEncodeContext; |
| |
| |
| /** |
| * Write streaminfo metadata block to byte array. |
| */ |
| static void write_streaminfo(FlacEncodeContext *s, uint8_t *header) |
| { |
| PutBitContext pb; |
| |
| memset(header, 0, FLAC_STREAMINFO_SIZE); |
| init_put_bits(&pb, header, FLAC_STREAMINFO_SIZE); |
| |
| /* streaminfo metadata block */ |
| put_bits(&pb, 16, s->max_blocksize); |
| put_bits(&pb, 16, s->max_blocksize); |
| put_bits(&pb, 24, s->min_framesize); |
| put_bits(&pb, 24, s->max_framesize); |
| put_bits(&pb, 20, s->samplerate); |
| put_bits(&pb, 3, s->channels-1); |
| put_bits(&pb, 5, s->avctx->bits_per_raw_sample - 1); |
| /* write 36-bit sample count in 2 put_bits() calls */ |
| put_bits(&pb, 24, (s->sample_count & 0xFFFFFF000LL) >> 12); |
| put_bits(&pb, 12, s->sample_count & 0x000000FFFLL); |
| flush_put_bits(&pb); |
| memcpy(&header[18], s->md5sum, 16); |
| } |
| |
| |
| /** |
| * Calculate an estimate for the maximum frame size based on verbatim mode. |
| * @param blocksize block size, in samples |
| * @param ch number of channels |
| * @param bps bits-per-sample |
| */ |
| static int flac_get_max_frame_size(int blocksize, int ch, int bps) |
| { |
| /* Technically, there is no limit to FLAC frame size, but an encoder |
| should not write a frame that is larger than if verbatim encoding mode |
| were to be used. */ |
| |
| int count; |
| |
| count = 16; /* frame header */ |
| count += ch * ((7+bps+7)/8); /* subframe headers */ |
| if (ch == 2) { |
| /* for stereo, need to account for using decorrelation */ |
| count += (( 2*bps+1) * blocksize + 7) / 8; |
| } else { |
| count += ( ch*bps * blocksize + 7) / 8; |
| } |
| count += 2; /* frame footer */ |
| |
| return count; |
| } |
| |
| |
| /** |
| * Set blocksize based on samplerate. |
| * Choose the closest predefined blocksize >= BLOCK_TIME_MS milliseconds. |
| */ |
| static int select_blocksize(int samplerate, int block_time_ms) |
| { |
| int i; |
| int target; |
| int blocksize; |
| |
| av_assert0(samplerate > 0); |
| blocksize = ff_flac_blocksize_table[1]; |
| target = (samplerate * block_time_ms) / 1000; |
| for (i = 0; i < 16; i++) { |
| if (target >= ff_flac_blocksize_table[i] && |
| ff_flac_blocksize_table[i] > blocksize) { |
| blocksize = ff_flac_blocksize_table[i]; |
| } |
| } |
| return blocksize; |
| } |
| |
| |
| static av_cold void dprint_compression_options(FlacEncodeContext *s) |
| { |
| AVCodecContext *avctx = s->avctx; |
| CompressionOptions *opt = &s->options; |
| |
| av_log(avctx, AV_LOG_DEBUG, " compression: %d\n", opt->compression_level); |
| |
| switch (opt->lpc_type) { |
| case FF_LPC_TYPE_NONE: |
| av_log(avctx, AV_LOG_DEBUG, " lpc type: None\n"); |
| break; |
| case FF_LPC_TYPE_FIXED: |
| av_log(avctx, AV_LOG_DEBUG, " lpc type: Fixed pre-defined coefficients\n"); |
| break; |
| case FF_LPC_TYPE_LEVINSON: |
| av_log(avctx, AV_LOG_DEBUG, " lpc type: Levinson-Durbin recursion with Welch window\n"); |
| break; |
| case FF_LPC_TYPE_CHOLESKY: |
| av_log(avctx, AV_LOG_DEBUG, " lpc type: Cholesky factorization, %d pass%s\n", |
| opt->lpc_passes, opt->lpc_passes == 1 ? "" : "es"); |
| break; |
| } |
| |
| av_log(avctx, AV_LOG_DEBUG, " prediction order: %d, %d\n", |
| opt->min_prediction_order, opt->max_prediction_order); |
| |
| switch (opt->prediction_order_method) { |
| case ORDER_METHOD_EST: |
| av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "estimate"); |
| break; |
| case ORDER_METHOD_2LEVEL: |
| av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "2-level"); |
| break; |
| case ORDER_METHOD_4LEVEL: |
| av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "4-level"); |
| break; |
| case ORDER_METHOD_8LEVEL: |
| av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "8-level"); |
| break; |
| case ORDER_METHOD_SEARCH: |
| av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "full search"); |
| break; |
| case ORDER_METHOD_LOG: |
| av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "log search"); |
| break; |
| } |
| |
| |
| av_log(avctx, AV_LOG_DEBUG, " partition order: %d, %d\n", |
| opt->min_partition_order, opt->max_partition_order); |
| |
| av_log(avctx, AV_LOG_DEBUG, " block size: %d\n", avctx->frame_size); |
| |
| av_log(avctx, AV_LOG_DEBUG, " lpc precision: %d\n", |
| opt->lpc_coeff_precision); |
| } |
| |
| |
| static av_cold int flac_encode_init(AVCodecContext *avctx) |
| { |
| int freq = avctx->sample_rate; |
| int channels = avctx->ch_layout.nb_channels; |
| FlacEncodeContext *s = avctx->priv_data; |
| int i, level, ret; |
| uint8_t *streaminfo; |
| |
| s->avctx = avctx; |
| |
| switch (avctx->sample_fmt) { |
| case AV_SAMPLE_FMT_S16: |
| avctx->bits_per_raw_sample = 16; |
| s->bps_code = 4; |
| break; |
| case AV_SAMPLE_FMT_S32: |
| if (avctx->bits_per_raw_sample <= 24) { |
| if (avctx->bits_per_raw_sample < 24) |
| av_log(avctx, AV_LOG_WARNING, "encoding as 24 bits-per-sample\n"); |
| avctx->bits_per_raw_sample = 24; |
| s->bps_code = 6; |
| } else if (avctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) { |
| av_log(avctx, AV_LOG_WARNING, |
| "encoding as 24 bits-per-sample, more is considered " |
| "experimental. Add -strict experimental if you want " |
| "to encode more than 24 bits-per-sample\n"); |
| avctx->bits_per_raw_sample = 24; |
| s->bps_code = 6; |
| } else { |
| avctx->bits_per_raw_sample = 32; |
| s->bps_code = 7; |
| } |
| break; |
| } |
| |
| if (channels < 1 || channels > FLAC_MAX_CHANNELS) { |
| av_log(avctx, AV_LOG_ERROR, "%d channels not supported (max %d)\n", |
| channels, FLAC_MAX_CHANNELS); |
| return AVERROR(EINVAL); |
| } |
| s->channels = channels; |
| |
| /* find samplerate in table */ |
| if (freq < 1) |
| return AVERROR(EINVAL); |
| for (i = 1; i < 12; i++) { |
| if (freq == ff_flac_sample_rate_table[i]) { |
| s->samplerate = ff_flac_sample_rate_table[i]; |
| s->sr_code[0] = i; |
| s->sr_code[1] = 0; |
| break; |
| } |
| } |
| /* if not in table, samplerate is non-standard */ |
| if (i == 12) { |
| if (freq % 1000 == 0 && freq < 255000) { |
| s->sr_code[0] = 12; |
| s->sr_code[1] = freq / 1000; |
| } else if (freq % 10 == 0 && freq < 655350) { |
| s->sr_code[0] = 14; |
| s->sr_code[1] = freq / 10; |
| } else if (freq < 65535) { |
| s->sr_code[0] = 13; |
| s->sr_code[1] = freq; |
| } else if (freq < 1048576) { |
| s->sr_code[0] = 0; |
| s->sr_code[1] = 0; |
| } else { |
| av_log(avctx, AV_LOG_ERROR, "%d Hz not supported\n", freq); |
| return AVERROR(EINVAL); |
| } |
| s->samplerate = freq; |
| } |
| |
| /* set compression option defaults based on avctx->compression_level */ |
| if (avctx->compression_level < 0) |
| s->options.compression_level = 5; |
| else |
| s->options.compression_level = avctx->compression_level; |
| |
| level = s->options.compression_level; |
| if (level > 12) { |
| av_log(avctx, AV_LOG_ERROR, "invalid compression level: %d\n", |
| s->options.compression_level); |
| return AVERROR(EINVAL); |
| } |
| |
| s->options.block_time_ms = ((int[]){ 27, 27, 27,105,105,105,105,105,105,105,105,105,105})[level]; |
| |
| if (s->options.lpc_type == FF_LPC_TYPE_DEFAULT) |
| s->options.lpc_type = ((int[]){ FF_LPC_TYPE_FIXED, FF_LPC_TYPE_FIXED, FF_LPC_TYPE_FIXED, |
| FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, |
| FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, |
| FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, |
| FF_LPC_TYPE_LEVINSON})[level]; |
| |
| if (s->options.min_prediction_order < 0) |
| s->options.min_prediction_order = ((int[]){ 2, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1})[level]; |
| if (s->options.max_prediction_order < 0) |
| s->options.max_prediction_order = ((int[]){ 3, 4, 4, 6, 8, 8, 8, 8, 12, 12, 12, 32, 32})[level]; |
| |
| if (s->options.prediction_order_method < 0) |
| s->options.prediction_order_method = ((int[]){ ORDER_METHOD_EST, ORDER_METHOD_EST, ORDER_METHOD_EST, |
| ORDER_METHOD_EST, ORDER_METHOD_EST, ORDER_METHOD_EST, |
| ORDER_METHOD_4LEVEL, ORDER_METHOD_LOG, ORDER_METHOD_4LEVEL, |
| ORDER_METHOD_LOG, ORDER_METHOD_SEARCH, ORDER_METHOD_LOG, |
| ORDER_METHOD_SEARCH})[level]; |
| |
| if (s->options.min_partition_order > s->options.max_partition_order) { |
| av_log(avctx, AV_LOG_ERROR, "invalid partition orders: min=%d max=%d\n", |
| s->options.min_partition_order, s->options.max_partition_order); |
| return AVERROR(EINVAL); |
| } |
| if (s->options.min_partition_order < 0) |
| s->options.min_partition_order = ((int[]){ 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0})[level]; |
| if (s->options.max_partition_order < 0) |
| s->options.max_partition_order = ((int[]){ 2, 2, 3, 3, 3, 8, 8, 8, 8, 8, 8, 8, 8})[level]; |
| |
| if (s->options.lpc_type == FF_LPC_TYPE_NONE) { |
| s->options.min_prediction_order = 0; |
| s->options.max_prediction_order = 0; |
| } else if (s->options.lpc_type == FF_LPC_TYPE_FIXED) { |
| if (s->options.min_prediction_order > MAX_FIXED_ORDER) { |
| av_log(avctx, AV_LOG_WARNING, |
| "invalid min prediction order %d, clamped to %d\n", |
| s->options.min_prediction_order, MAX_FIXED_ORDER); |
| s->options.min_prediction_order = MAX_FIXED_ORDER; |
| } |
| if (s->options.max_prediction_order > MAX_FIXED_ORDER) { |
| av_log(avctx, AV_LOG_WARNING, |
| "invalid max prediction order %d, clamped to %d\n", |
| s->options.max_prediction_order, MAX_FIXED_ORDER); |
| s->options.max_prediction_order = MAX_FIXED_ORDER; |
| } |
| } |
| |
| if (s->options.max_prediction_order < s->options.min_prediction_order) { |
| av_log(avctx, AV_LOG_ERROR, "invalid prediction orders: min=%d max=%d\n", |
| s->options.min_prediction_order, s->options.max_prediction_order); |
| return AVERROR(EINVAL); |
| } |
| |
| if (avctx->frame_size > 0) { |
| if (avctx->frame_size < FLAC_MIN_BLOCKSIZE || |
| avctx->frame_size > FLAC_MAX_BLOCKSIZE) { |
| av_log(avctx, AV_LOG_ERROR, "invalid block size: %d\n", |
| avctx->frame_size); |
| return AVERROR(EINVAL); |
| } |
| } else { |
| s->avctx->frame_size = select_blocksize(s->samplerate, s->options.block_time_ms); |
| } |
| s->max_blocksize = s->avctx->frame_size; |
| |
| /* set maximum encoded frame size in verbatim mode */ |
| s->max_framesize = flac_get_max_frame_size(s->avctx->frame_size, |
| s->channels, |
| s->avctx->bits_per_raw_sample); |
| |
| /* initialize MD5 context */ |
| s->md5ctx = av_md5_alloc(); |
| if (!s->md5ctx) |
| return AVERROR(ENOMEM); |
| av_md5_init(s->md5ctx); |
| |
| streaminfo = av_malloc(FLAC_STREAMINFO_SIZE); |
| if (!streaminfo) |
| return AVERROR(ENOMEM); |
| write_streaminfo(s, streaminfo); |
| avctx->extradata = streaminfo; |
| avctx->extradata_size = FLAC_STREAMINFO_SIZE; |
| |
| s->frame_count = 0; |
| s->min_framesize = s->max_framesize; |
| |
| if ((channels == 3 && |
| av_channel_layout_compare(&avctx->ch_layout, &(AVChannelLayout)AV_CHANNEL_LAYOUT_SURROUND)) || |
| (channels == 4 && |
| av_channel_layout_compare(&avctx->ch_layout, &(AVChannelLayout)AV_CHANNEL_LAYOUT_2_2) && |
| av_channel_layout_compare(&avctx->ch_layout, &(AVChannelLayout)AV_CHANNEL_LAYOUT_QUAD)) || |
| (channels == 5 && |
| av_channel_layout_compare(&avctx->ch_layout, &(AVChannelLayout)AV_CHANNEL_LAYOUT_5POINT0) && |
| av_channel_layout_compare(&avctx->ch_layout, &(AVChannelLayout)AV_CHANNEL_LAYOUT_5POINT0_BACK)) || |
| (channels == 6 && |
| av_channel_layout_compare(&avctx->ch_layout, &(AVChannelLayout)AV_CHANNEL_LAYOUT_5POINT1) && |
| av_channel_layout_compare(&avctx->ch_layout, &(AVChannelLayout)AV_CHANNEL_LAYOUT_5POINT1_BACK))) { |
| if (avctx->ch_layout.order != AV_CHANNEL_ORDER_UNSPEC) { |
| 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_flacencdsp_init(&s->flac_dsp); |
| |
| 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; |
| |
| #define COPY_SAMPLES(bits, shift0) do { \ |
| const int ## bits ## _t *samples0 = samples; \ |
| const int shift = shift0; \ |
| 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, 0); |
| else |
| COPY_SAMPLES(32, 32 - s->avctx->bits_per_raw_sample); |
| } |
| |
| |
| 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++) { |
| unsigned v = ((unsigned)(res[i]) << 1) ^ (res[i] >> 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 = pred_order; i < n; i++) |
| udata[i] = ((unsigned)(data[i]) << 1) ^ (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; |
| } |
| } |
| } |
| |
| |
| /* These four functions check for every residual whether it can be |
| * contained in <INT32_MIN,INT32_MAX]. In case it doesn't, the |
| * function that called this function has to try something else. |
| * Each function is duplicated, once for int32_t input, once for |
| * int64_t input */ |
| #define ENCODE_RESIDUAL_FIXED_WITH_RESIDUAL_LIMIT() \ |
| { \ |
| for (int i = 0; i < order; i++) \ |
| res[i] = smp[i]; \ |
| if (order == 0) { \ |
| for (int i = order; i < n; i++) { \ |
| if (smp[i] == INT32_MIN) \ |
| return 1; \ |
| res[i] = smp[i]; \ |
| } \ |
| } else if (order == 1) { \ |
| for (int i = order; i < n; i++) { \ |
| int64_t res64 = (int64_t)smp[i] - smp[i-1]; \ |
| if (res64 <= INT32_MIN || res64 > INT32_MAX) \ |
| return 1; \ |
| res[i] = res64; \ |
| } \ |
| } else if (order == 2) { \ |
| for (int i = order; i < n; i++) { \ |
| int64_t res64 = (int64_t)smp[i] - 2*(int64_t)smp[i-1] + smp[i-2]; \ |
| if (res64 <= INT32_MIN || res64 > INT32_MAX) \ |
| return 1; \ |
| res[i] = res64; \ |
| } \ |
| } else if (order == 3) { \ |
| for (int i = order; i < n; i++) { \ |
| int64_t res64 = (int64_t)smp[i] - 3*(int64_t)smp[i-1] + 3*(int64_t)smp[i-2] - smp[i-3]; \ |
| if (res64 <= INT32_MIN || res64 > INT32_MAX) \ |
| return 1; \ |
| res[i] = res64; \ |
| } \ |
| } else { \ |
| for (int i = order; i < n; i++) { \ |
| int64_t res64 = (int64_t)smp[i] - 4*(int64_t)smp[i-1] + 6*(int64_t)smp[i-2] - 4*(int64_t)smp[i-3] + smp[i-4]; \ |
| if (res64 <= INT32_MIN || res64 > INT32_MAX) \ |
| return 1; \ |
| res[i] = res64; \ |
| } \ |
| } \ |
| return 0; \ |
| } |
| |
| static int encode_residual_fixed_with_residual_limit(int32_t *res, const int32_t *smp, |
| int n, int order) |
| { |
| ENCODE_RESIDUAL_FIXED_WITH_RESIDUAL_LIMIT(); |
| } |
| |
| |
| static int encode_residual_fixed_with_residual_limit_33bps(int32_t *res, const int64_t *smp, |
| int n, int order) |
| { |
| ENCODE_RESIDUAL_FIXED_WITH_RESIDUAL_LIMIT(); |
| } |
| |
| #define LPC_ENCODE_WITH_RESIDUAL_LIMIT() \ |
| { \ |
| for (int i = 0; i < order; i++) \ |
| res[i] = smp[i]; \ |
| for (int i = order; i < len; i++) { \ |
| int64_t p = 0, tmp; \ |
| for (int j = 0; j < order; j++) \ |
| p += (int64_t)coefs[j]*smp[(i-1)-j]; \ |
| p >>= shift; \ |
| tmp = smp[i] - p; \ |
| if (tmp <= INT32_MIN || tmp > INT32_MAX) \ |
| return 1; \ |
| res[i] = tmp; \ |
| } \ |
| return 0; \ |
| } |
| |
| static int lpc_encode_with_residual_limit(int32_t *res, const int32_t *smp, int len, |
| int order, int32_t *coefs, int shift) |
| { |
| LPC_ENCODE_WITH_RESIDUAL_LIMIT(); |
| } |
| |
| static int lpc_encode_with_residual_limit_33bps(int32_t *res, const int64_t *smp, int len, |
| int order, int32_t *coefs, int shift) |
| { |
| LPC_ENCODE_WITH_RESIDUAL_LIMIT(); |
| } |
| |
| static int lpc_encode_choose_datapath(FlacEncodeContext *s, int32_t bps, |
| int32_t *res, const int32_t *smp, |
| const int64_t *smp_33bps, int len, |
| int order, int32_t *coefs, int shift) |
| { |
| uint64_t max_residual_value = 0; |
| int64_t max_sample_value = ((int64_t)(1) << (bps-1)); |
| /* This calculates the max size of any residual with the current |
| * predictor, so we know whether we need to check the residual */ |
| for (int i = 0; i < order; i++) |
| max_residual_value += FFABS(max_sample_value * coefs[i]); |
| max_residual_value >>= shift; |
| max_residual_value += max_sample_value; |
| if (bps > 32) { |
| if (lpc_encode_with_residual_limit_33bps(res, smp_33bps, len, order, coefs, shift)) |
| return 1; |
| } else if (max_residual_value > INT32_MAX) { |
| if (lpc_encode_with_residual_limit(res, smp, len, order, coefs, shift)) |
| return 1; |
| } else if (bps + s->options.lpc_coeff_precision + av_log2(order) <= 32) { |
| s->flac_dsp.lpc16_encode(res, smp, len, order, coefs, shift); |
| } else { |
| s->flac_dsp.lpc32_encode(res, smp, len, order, coefs, shift); |
| } |
| return 0; |
| } |
| |
| #define DEFAULT_TO_VERBATIM() \ |
| { \ |
| sub->type = sub->type_code = FLAC_SUBFRAME_VERBATIM; \ |
| if (sub->obits <= 32) \ |
| memcpy(res, smp, n * sizeof(int32_t)); \ |
| return subframe_count_exact(s, sub, 0); \ |
| } |
| |
| 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; |
| int64_t *smp_33bps; |
| |
| frame = &s->frame; |
| sub = &frame->subframes[ch]; |
| res = sub->residual; |
| smp = sub->samples; |
| smp_33bps = frame->samples_33bps; |
| n = frame->blocksize; |
| |
| /* CONSTANT */ |
| if (sub->obits > 32) { |
| for (i = 1; i < n; i++) |
| if(smp_33bps[i] != smp_33bps[0]) |
| break; |
| if (i == n) { |
| sub->type = sub->type_code = FLAC_SUBFRAME_CONSTANT; |
| return subframe_count_exact(s, sub, 0); |
| } |
| } else { |
| 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) { |
| DEFAULT_TO_VERBATIM(); |
| } |
| |
| 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++) { |
| if (sub->obits == 33) { |
| if (encode_residual_fixed_with_residual_limit_33bps(res, smp_33bps, n, i)) |
| continue; |
| } else if (sub->obits + i >= 32) { |
| if (encode_residual_fixed_with_residual_limit(res, smp, n, i)) |
| continue; |
| } else |
| 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; |
| } |
| if (opt_order == 0 && bits[0] == UINT32_MAX) { |
| /* No predictor found with residuals within <INT32_MIN,INT32_MAX], |
| * so encode a verbatim subframe instead */ |
| DEFAULT_TO_VERBATIM(); |
| } |
| sub->order = opt_order; |
| sub->type_code = sub->type | sub->order; |
| if (sub->order != max_order) { |
| if (sub->obits == 33) |
| encode_residual_fixed_with_residual_limit_33bps(res, smp_33bps, n, sub->order); |
| else if (sub->obits + i >= 32) |
| encode_residual_fixed_with_residual_limit(res, smp, n, sub->order); |
| else |
| 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; |
| if (sub->obits == 33) |
| /* As ff_lpc_calc_coefs is shared with other codecs and the LSB |
| * probably isn't predictable anyway, throw away LSB for analysis |
| * so it fits 32 bit int and existing function can be used |
| * unmodified */ |
| for (i = 0; i < n; i++) |
| smp[i] = smp_33bps[i] >> 1; |
| |
| 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(lpc_encode_choose_datapath(s, sub->obits, res, smp, smp_33bps, n, order+1, coefs[order], shift[order])) |
| continue; |
| 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(lpc_encode_choose_datapath(s, sub->obits, res, smp, smp_33bps, n, i+1, coefs[i], shift[i])) |
| continue; |
| 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(lpc_encode_choose_datapath(s, sub->obits, res, smp, smp_33bps, n, i+1, coefs[i], shift[i])) |
| continue; |
| 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(lpc_encode_choose_datapath(s, sub->obits, res, smp, smp_33bps, n, opt_order, lpc_try, shift[opt_order-1])) |
| continue; |
| 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(lpc_encode_choose_datapath(s, sub->obits, res, smp, smp_33bps, n, sub->order, sub->coefs, sub->shift)) { |
| /* No predictor found with residuals within <INT32_MIN,INT32_MAX], |
| * so encode a verbatim subframe instead */ |
| DEFAULT_TO_VERBATIM(); |
| } |
| |
| 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, wasted_bits; |
| |
| for (ch = 0; ch < s->channels; ch++) { |
| FlacSubframe *sub = &s->frame.subframes[ch]; |
| |
| if (sub->obits > 32) { |
| int64_t v = 0; |
| for (i = 0; i < s->frame.blocksize; i++) { |
| v |= s->frame.samples_33bps[i]; |
| if (v & 1) |
| break; |
| } |
| |
| if (!v || (v & 1)) |
| return; |
| |
| v = ff_ctzll(v); |
| |
| /* If any wasted bits are found, samples are moved |
| * from frame.samples_33bps to frame.subframes[ch] */ |
| for (i = 0; i < s->frame.blocksize; i++) |
| sub->samples[i] = s->frame.samples_33bps[i] >> v; |
| wasted_bits = v; |
| } else { |
| int32_t v = 0; |
| for (i = 0; i < s->frame.blocksize; i++) { |
| v |= sub->samples[i]; |
| if (v & 1) |
| break; |
| } |
| |
| if (!v || (v & 1)) |
| return; |
| |
| v = ff_ctz(v); |
| |
| for (i = 0; i < s->frame.blocksize; i++) |
| sub->samples[i] >>= v; |
| wasted_bits = v; |
| } |
| |
| sub->wasted = wasted_bits; |
| sub->obits -= wasted_bits; |
| |
| /* 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 bps) |
| { |
| int best; |
| 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; |
| if(bps < 30) { |
| int32_t lt, rt; |
| for (int 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); |
| } |
| } else { |
| int64_t lt, rt; |
| for (int i = 2; i < n; i++) { |
| lt = (int64_t)left_ch[i] - 2*(int64_t)left_ch[i-1] + left_ch[i-2]; |
| rt = (int64_t)right_ch[i] - 2*(int64_t)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 (int 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 (int 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; |
| int64_t *side_33bps; |
| int n; |
| |
| frame = &s->frame; |
| n = frame->blocksize; |
| left = frame->subframes[0].samples; |
| right = frame->subframes[1].samples; |
| side_33bps = frame->samples_33bps; |
| |
| 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, s->avctx->bits_per_raw_sample); |
| } else |
| frame->ch_mode = s->options.ch_mode; |
| |
| /* perform decorrelation and adjust bits-per-sample */ |
| if (frame->ch_mode == FLAC_CHMODE_INDEPENDENT) |
| return; |
| if(s->avctx->bits_per_raw_sample == 32) { |
| if (frame->ch_mode == FLAC_CHMODE_MID_SIDE) { |
| int64_t tmp; |
| for (int i = 0; i < n; i++) { |
| tmp = left[i]; |
| left[i] = (tmp + right[i]) >> 1; |
| side_33bps[i] = tmp - right[i]; |
| } |
| frame->subframes[1].obits++; |
| } else if (frame->ch_mode == FLAC_CHMODE_LEFT_SIDE) { |
| for (int i = 0; i < n; i++) |
| side_33bps[i] = (int64_t)left[i] - right[i]; |
| frame->subframes[1].obits++; |
| } else { |
| for (int i = 0; i < n; i++) |
| side_33bps[i] = (int64_t)left[i] - right[i]; |
| frame->subframes[0].obits++; |
| } |
| } else { |
| if (frame->ch_mode == FLAC_CHMODE_MID_SIDE) { |
| int32_t tmp; |
| for (int 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 (int i = 0; i < n; i++) |
| right[i] = left[i] - right[i]; |
| frame->subframes[1].obits++; |
| } else { |
| for (int 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_bytes_output(&s->pb)); |
| put_bits(&s->pb, 8, crc); |
| } |
| |
| |
| static inline void set_sr_golomb_flac(PutBitContext *pb, int i, int k) |
| { |
| unsigned v, e; |
| |
| v = ((unsigned)(i) << 1) ^ (i >> 31); |
| |
| e = (v >> k) + 1; |
| while (e > 31) { |
| put_bits(pb, 31, 0); |
| e -= 31; |
| } |
| put_bits(pb, e, 1); |
| if (k) { |
| unsigned mask = UINT32_MAX >> (32-k); |
| put_bits(pb, k, v & mask); |
| } |
| } |
| |
| |
| static void write_subframes(FlacEncodeContext *s) |
| { |
| int ch; |
| |
| for (ch = 0; ch < s->channels; ch++) { |
| FlacSubframe *sub = &s->frame.subframes[ch]; |
| int 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) { |
| if(sub->obits == 33) |
| put_sbits63(&s->pb, 33, s->frame.samples_33bps[0]); |
| else if(sub->obits == 32) |
| put_bits32(&s->pb, res[0]); |
| else |
| put_sbits(&s->pb, sub->obits, res[0]); |
| } else if (sub->type == FLAC_SUBFRAME_VERBATIM) { |
| if (sub->obits == 33) { |
| int64_t *res64 = s->frame.samples_33bps; |
| int64_t *frame_end64 = &s->frame.samples_33bps[s->frame.blocksize]; |
| while (res64 < frame_end64) |
| put_sbits63(&s->pb, 33, (*res64++)); |
| } else if (sub->obits == 32) { |
| while (res < frame_end) |
| put_bits32(&s->pb, *res++); |
| } else { |
| while (res < frame_end) |
| put_sbits(&s->pb, sub->obits, *res++); |
| } |
| } else { |
| /* warm-up samples */ |
| if (sub->obits == 33) { |
| for (int i = 0; i < sub->order; i++) |
| put_sbits63(&s->pb, 33, s->frame.samples_33bps[i]); |
| res += sub->order; |
| } else if (sub->obits == 32) { |
| for (int i = 0; i < sub->order; i++) |
| put_bits32(&s->pb, *res++); |
| } else { |
| for (int 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 (int 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); |
| 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_bytes_output(&s->pb))); |
| 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_bytes_output(&s->pb); |
| } |
| |
| |
| 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 if (s->avctx->bits_per_raw_sample <= 24) { |
| 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; |
| } else { |
| /* s->avctx->bits_per_raw_sample <= 32 */ |
| int i; |
| const int32_t *samples0 = samples; |
| uint8_t *tmp = s->md5_buffer; |
| |
| for (i = 0; i < s->frame.blocksize * s->channels; i++) |
| AV_WL32(tmp + 4*i, samples0[i]); |
| 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 (!s->flushed) { |
| 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 = 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_get_encode_buffer(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; |
| |
| s->next_pts = frame->pts + ff_samples_to_time_base(avctx, frame->nb_samples); |
| |
| av_shrink_packet(avpkt, out_bytes); |
| |
| *got_packet_ptr = 1; |
| return 0; |
| } |
| |
| |
| static av_cold int flac_encode_close(AVCodecContext *avctx) |
| { |
| FlacEncodeContext *s = avctx->priv_data; |
| |
| av_freep(&s->md5ctx); |
| av_freep(&s->md5_buffer); |
| ff_lpc_end(&s->lpc_ctx); |
| 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, .unit = "lpc_type" }, |
| { "none", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_NONE }, INT_MIN, INT_MAX, FLAGS, .unit = "lpc_type" }, |
| { "fixed", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_FIXED }, INT_MIN, INT_MAX, FLAGS, .unit = "lpc_type" }, |
| { "levinson", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_LEVINSON }, INT_MIN, INT_MAX, FLAGS, .unit = "lpc_type" }, |
| { "cholesky", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_CHOLESKY }, INT_MIN, INT_MAX, FLAGS, .unit = "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, .unit = "predm" }, |
| { "estimation", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_EST }, INT_MIN, INT_MAX, FLAGS, .unit = "predm" }, |
| { "2level", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_2LEVEL }, INT_MIN, INT_MAX, FLAGS, .unit = "predm" }, |
| { "4level", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_4LEVEL }, INT_MIN, INT_MAX, FLAGS, .unit = "predm" }, |
| { "8level", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_8LEVEL }, INT_MIN, INT_MAX, FLAGS, .unit = "predm" }, |
| { "search", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_SEARCH }, INT_MIN, INT_MAX, FLAGS, .unit = "predm" }, |
| { "log", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_LOG }, INT_MIN, INT_MAX, FLAGS, .unit = "predm" }, |
| { "ch_mode", "Stereo decorrelation mode", offsetof(FlacEncodeContext, options.ch_mode), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, FLAC_CHMODE_MID_SIDE, FLAGS, .unit = "ch_mode" }, |
| { "auto", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = -1 }, INT_MIN, INT_MAX, FLAGS, .unit = "ch_mode" }, |
| { "indep", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_INDEPENDENT }, INT_MIN, INT_MAX, FLAGS, .unit = "ch_mode" }, |
| { "left_side", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_LEFT_SIDE }, INT_MIN, INT_MAX, FLAGS, .unit = "ch_mode" }, |
| { "right_side", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_RIGHT_SIDE }, INT_MIN, INT_MAX, FLAGS, .unit = "ch_mode" }, |
| { "mid_side", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_MID_SIDE }, INT_MIN, INT_MAX, FLAGS, .unit = "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, |
| }; |
| |
| const FFCodec ff_flac_encoder = { |
| .p.name = "flac", |
| CODEC_LONG_NAME("FLAC (Free Lossless Audio Codec)"), |
| .p.type = AVMEDIA_TYPE_AUDIO, |
| .p.id = AV_CODEC_ID_FLAC, |
| .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY | |
| AV_CODEC_CAP_SMALL_LAST_FRAME | |
| AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE, |
| .priv_data_size = sizeof(FlacEncodeContext), |
| .init = flac_encode_init, |
| FF_CODEC_ENCODE_CB(flac_encode_frame), |
| .close = flac_encode_close, |
| .p.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16, |
| AV_SAMPLE_FMT_S32, |
| AV_SAMPLE_FMT_NONE }, |
| .p.priv_class = &flac_encoder_class, |
| .caps_internal = FF_CODEC_CAP_INIT_CLEANUP | FF_CODEC_CAP_EOF_FLUSH, |
| }; |