/**
* FLAC audio encoder
- * Copyright (c) 2006 Justin Ruggles <jruggle@earthlink.net>
+ * Copyright (c) 2006 Justin Ruggles <justin.ruggles@gmail.com>
*
- * This library is free software; you can redistribute it and/or
+ * 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * 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 this library; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#include "libavutil/crc.h"
+#include "libavutil/md5.h"
#include "avcodec.h"
-#include "bitstream.h"
-#include "crc.h"
+#include "get_bits.h"
#include "golomb.h"
-
-#define FLAC_MAX_CH 8
-#define FLAC_MIN_BLOCKSIZE 16
-#define FLAC_MAX_BLOCKSIZE 65535
+#include "lpc.h"
+#include "flac.h"
+#include "flacdata.h"
#define FLAC_SUBFRAME_CONSTANT 0
#define FLAC_SUBFRAME_VERBATIM 1
#define FLAC_SUBFRAME_FIXED 8
#define FLAC_SUBFRAME_LPC 32
-#define FLAC_CHMODE_NOT_STEREO 0
-#define FLAC_CHMODE_LEFT_RIGHT 1
-#define FLAC_CHMODE_LEFT_SIDE 8
-#define FLAC_CHMODE_RIGHT_SIDE 9
-#define FLAC_CHMODE_MID_SIDE 10
-
-#define FLAC_STREAMINFO_SIZE 34
+#define MAX_FIXED_ORDER 4
+#define MAX_PARTITION_ORDER 8
+#define MAX_PARTITIONS (1 << MAX_PARTITION_ORDER)
+#define MAX_LPC_PRECISION 15
+#define MAX_LPC_SHIFT 15
+#define MAX_RICE_PARAM 14
+
+typedef struct CompressionOptions {
+ int compression_level;
+ int block_time_ms;
+ enum AVLPCType lpc_type;
+ int lpc_passes;
+ int lpc_coeff_precision;
+ int min_prediction_order;
+ int max_prediction_order;
+ int prediction_order_method;
+ int min_partition_order;
+ int max_partition_order;
+} CompressionOptions;
+
+typedef struct RiceContext {
+ int porder;
+ int params[MAX_PARTITIONS];
+} RiceContext;
typedef struct FlacSubframe {
int type;
int type_code;
int obits;
int order;
+ int32_t coefs[MAX_LPC_ORDER];
+ int shift;
+ RiceContext rc;
int32_t samples[FLAC_MAX_BLOCKSIZE];
- int32_t residual[FLAC_MAX_BLOCKSIZE];
+ int32_t residual[FLAC_MAX_BLOCKSIZE+1];
} FlacSubframe;
typedef struct FlacFrame {
- FlacSubframe subframes[FLAC_MAX_CH];
+ FlacSubframe subframes[FLAC_MAX_CHANNELS];
int blocksize;
int bs_code[2];
uint8_t crc8;
int ch_mode;
+ int verbatim_only;
} FlacFrame;
typedef struct FlacEncodeContext {
PutBitContext pb;
int channels;
- int ch_code;
int samplerate;
int sr_code[2];
- int blocksize;
+ int max_blocksize;
+ int min_framesize;
int max_framesize;
+ int max_encoded_framesize;
uint32_t frame_count;
+ uint64_t sample_count;
+ uint8_t md5sum[16];
FlacFrame frame;
+ CompressionOptions options;
+ AVCodecContext *avctx;
+ LPCContext lpc_ctx;
+ struct AVMD5 *md5ctx;
} FlacEncodeContext;
-static const int flac_samplerates[16] = {
- 0, 0, 0, 0,
- 8000, 16000, 22050, 24000, 32000, 44100, 48000, 96000,
- 0, 0, 0, 0
-};
-
-static const int flac_blocksizes[16] = {
- 0,
- 192,
- 576, 1152, 2304, 4608,
- 0, 0,
- 256, 512, 1024, 2048, 4096, 8192, 16384, 32768
-};
/**
- * Writes streaminfo metadata block to byte array
+ * Write streaminfo metadata block to byte array.
*/
static void write_streaminfo(FlacEncodeContext *s, uint8_t *header)
{
init_put_bits(&pb, header, FLAC_STREAMINFO_SIZE);
/* streaminfo metadata block */
- put_bits(&pb, 16, s->blocksize);
- put_bits(&pb, 16, s->blocksize);
- put_bits(&pb, 24, 0);
+ put_bits(&pb, 16, s->max_blocksize);
+ put_bits(&pb, 16, s->max_blocksize);
+ put_bits(&pb, 24, s->min_framesize);
put_bits(&pb, 24, s->max_framesize);
put_bits(&pb, 20, s->samplerate);
put_bits(&pb, 3, s->channels-1);
put_bits(&pb, 5, 15); /* bits per sample - 1 */
+ /* write 36-bit sample count in 2 put_bits() calls */
+ put_bits(&pb, 24, (s->sample_count & 0xFFFFFF000LL) >> 12);
+ put_bits(&pb, 12, s->sample_count & 0x000000FFFLL);
flush_put_bits(&pb);
- /* total samples = 0 */
- /* MD5 signature = 0 */
+ memcpy(&header[18], s->md5sum, 16);
}
-#define BLOCK_TIME_MS 105
/**
- * Sets blocksize based on samplerate
- * Chooses the closest predefined blocksize >= BLOCK_TIME_MS milliseconds
+ * Set blocksize based on samplerate.
+ * Choose the closest predefined blocksize >= BLOCK_TIME_MS milliseconds.
*/
-static int select_blocksize(int samplerate)
+static int select_blocksize(int samplerate, int block_time_ms)
{
int i;
int target;
int blocksize;
assert(samplerate > 0);
- blocksize = flac_blocksizes[1];
- target = (samplerate * BLOCK_TIME_MS) / 1000;
- for(i=0; i<16; i++) {
- if(target >= flac_blocksizes[i] && flac_blocksizes[i] > blocksize) {
- blocksize = flac_blocksizes[i];
+ 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 int flac_encode_init(AVCodecContext *avctx)
+
+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 AV_LPC_TYPE_NONE:
+ av_log(avctx, AV_LOG_DEBUG, " lpc type: None\n");
+ break;
+ case AV_LPC_TYPE_FIXED:
+ av_log(avctx, AV_LOG_DEBUG, " lpc type: Fixed pre-defined coefficients\n");
+ break;
+ case AV_LPC_TYPE_LEVINSON:
+ av_log(avctx, AV_LOG_DEBUG, " lpc type: Levinson-Durbin recursion with Welch window\n");
+ break;
+ case AV_LPC_TYPE_CHOLESKY:
+ av_log(avctx, AV_LOG_DEBUG, " lpc type: Cholesky factorization, %d pass%s\n",
+ opt->lpc_passes, opt->lpc_passes == 1 ? "" : "es");
+ break;
+ }
+
+ av_log(avctx, AV_LOG_DEBUG, " prediction order: %d, %d\n",
+ opt->min_prediction_order, opt->max_prediction_order);
+
+ switch (opt->prediction_order_method) {
+ case ORDER_METHOD_EST:
+ av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "estimate");
+ break;
+ case ORDER_METHOD_2LEVEL:
+ av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "2-level");
+ break;
+ case ORDER_METHOD_4LEVEL:
+ av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "4-level");
+ break;
+ case ORDER_METHOD_8LEVEL:
+ av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "8-level");
+ break;
+ case ORDER_METHOD_SEARCH:
+ av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "full search");
+ break;
+ case ORDER_METHOD_LOG:
+ av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "log search");
+ break;
+ }
+
+
+ av_log(avctx, AV_LOG_DEBUG, " partition order: %d, %d\n",
+ opt->min_partition_order, opt->max_partition_order);
+
+ av_log(avctx, AV_LOG_DEBUG, " block size: %d\n", avctx->frame_size);
+
+ av_log(avctx, AV_LOG_DEBUG, " lpc precision: %d\n",
+ opt->lpc_coeff_precision);
+}
+
+
+static av_cold int flac_encode_init(AVCodecContext *avctx)
{
int freq = avctx->sample_rate;
int channels = avctx->channels;
FlacEncodeContext *s = avctx->priv_data;
- int i;
+ int i, level, ret;
uint8_t *streaminfo;
- if(avctx->sample_fmt != SAMPLE_FMT_S16) {
+ s->avctx = avctx;
+
+ if (avctx->sample_fmt != AV_SAMPLE_FMT_S16)
return -1;
- }
- if(channels < 1 || channels > FLAC_MAX_CH) {
+ if (channels < 1 || channels > FLAC_MAX_CHANNELS)
return -1;
- }
s->channels = channels;
- s->ch_code = s->channels-1;
/* find samplerate in table */
- if(freq < 1)
+ if (freq < 1)
return -1;
- for(i=4; i<12; i++) {
- if(freq == flac_samplerates[i]) {
- s->samplerate = flac_samplerates[i];
+ for (i = 4; i < 12; i++) {
+ if (freq == ff_flac_sample_rate_table[i]) {
+ s->samplerate = ff_flac_sample_rate_table[i];
s->sr_code[0] = i;
s->sr_code[1] = 0;
break;
}
}
/* if not in table, samplerate is non-standard */
- if(i == 12) {
- if(freq % 1000 == 0 && freq < 255000) {
+ 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) {
+ } else if (freq % 10 == 0 && freq < 655350) {
s->sr_code[0] = 14;
s->sr_code[1] = freq / 10;
- } else if(freq < 65535) {
+ } else if (freq < 65535) {
s->sr_code[0] = 13;
s->sr_code[1] = freq;
} else {
s->samplerate = freq;
}
- s->blocksize = select_blocksize(s->samplerate);
- avctx->frame_size = s->blocksize;
+ /* 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;
- /* set maximum encoded frame size in verbatim mode */
- if(s->channels == 2) {
- s->max_framesize = 14 + ((s->blocksize * 33 + 7) >> 3);
+ level = s->options.compression_level;
+ if (level > 12) {
+ av_log(avctx, AV_LOG_ERROR, "invalid compression level: %d\n",
+ s->options.compression_level);
+ return -1;
+ }
+
+ s->options.block_time_ms = ((int[]){ 27, 27, 27,105,105,105,105,105,105,105,105,105,105})[level];
+
+ s->options.lpc_type = ((int[]){ AV_LPC_TYPE_FIXED, AV_LPC_TYPE_FIXED, AV_LPC_TYPE_FIXED,
+ AV_LPC_TYPE_LEVINSON, AV_LPC_TYPE_LEVINSON, AV_LPC_TYPE_LEVINSON,
+ AV_LPC_TYPE_LEVINSON, AV_LPC_TYPE_LEVINSON, AV_LPC_TYPE_LEVINSON,
+ AV_LPC_TYPE_LEVINSON, AV_LPC_TYPE_LEVINSON, AV_LPC_TYPE_LEVINSON,
+ AV_LPC_TYPE_LEVINSON})[level];
+
+ s->options.min_prediction_order = ((int[]){ 2, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1})[level];
+ s->options.max_prediction_order = ((int[]){ 3, 4, 4, 6, 8, 8, 8, 8, 12, 12, 12, 32, 32})[level];
+
+ 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];
+
+ s->options.min_partition_order = ((int[]){ 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0})[level];
+ s->options.max_partition_order = ((int[]){ 2, 2, 3, 3, 3, 8, 8, 8, 8, 8, 8, 8, 8})[level];
+
+ /* set compression option overrides from AVCodecContext */
+ if (avctx->lpc_type > AV_LPC_TYPE_DEFAULT) {
+ if (avctx->lpc_type > AV_LPC_TYPE_CHOLESKY) {
+ av_log(avctx, AV_LOG_ERROR, "unknown lpc type: %d\n", avctx->lpc_type);
+ return -1;
+ }
+ s->options.lpc_type = avctx->lpc_type;
+ if (s->options.lpc_type == AV_LPC_TYPE_CHOLESKY) {
+ if (avctx->lpc_passes < 0) {
+ // default number of passes for Cholesky
+ s->options.lpc_passes = 2;
+ } else if (avctx->lpc_passes == 0) {
+ av_log(avctx, AV_LOG_ERROR, "invalid number of lpc passes: %d\n",
+ avctx->lpc_passes);
+ return -1;
+ } else {
+ s->options.lpc_passes = avctx->lpc_passes;
+ }
+ }
+ }
+
+ if (s->options.lpc_type == AV_LPC_TYPE_NONE) {
+ s->options.min_prediction_order = 0;
+ } else if (avctx->min_prediction_order >= 0) {
+ if (s->options.lpc_type == AV_LPC_TYPE_FIXED) {
+ if (avctx->min_prediction_order > MAX_FIXED_ORDER) {
+ av_log(avctx, AV_LOG_ERROR, "invalid min prediction order: %d\n",
+ avctx->min_prediction_order);
+ return -1;
+ }
+ } else if (avctx->min_prediction_order < MIN_LPC_ORDER ||
+ avctx->min_prediction_order > MAX_LPC_ORDER) {
+ av_log(avctx, AV_LOG_ERROR, "invalid min prediction order: %d\n",
+ avctx->min_prediction_order);
+ return -1;
+ }
+ s->options.min_prediction_order = avctx->min_prediction_order;
+ }
+ if (s->options.lpc_type == AV_LPC_TYPE_NONE) {
+ s->options.max_prediction_order = 0;
+ } else if (avctx->max_prediction_order >= 0) {
+ if (s->options.lpc_type == AV_LPC_TYPE_FIXED) {
+ if (avctx->max_prediction_order > MAX_FIXED_ORDER) {
+ av_log(avctx, AV_LOG_ERROR, "invalid max prediction order: %d\n",
+ avctx->max_prediction_order);
+ return -1;
+ }
+ } else if (avctx->max_prediction_order < MIN_LPC_ORDER ||
+ avctx->max_prediction_order > MAX_LPC_ORDER) {
+ av_log(avctx, AV_LOG_ERROR, "invalid max prediction order: %d\n",
+ avctx->max_prediction_order);
+ return -1;
+ }
+ s->options.max_prediction_order = avctx->max_prediction_order;
+ }
+ if (s->options.max_prediction_order < s->options.min_prediction_order) {
+ av_log(avctx, AV_LOG_ERROR, "invalid prediction orders: min=%d max=%d\n",
+ s->options.min_prediction_order, s->options.max_prediction_order);
+ return -1;
+ }
+
+ if (avctx->prediction_order_method >= 0) {
+ if (avctx->prediction_order_method > ORDER_METHOD_LOG) {
+ av_log(avctx, AV_LOG_ERROR, "invalid prediction order method: %d\n",
+ avctx->prediction_order_method);
+ return -1;
+ }
+ s->options.prediction_order_method = avctx->prediction_order_method;
+ }
+
+ if (avctx->min_partition_order >= 0) {
+ if (avctx->min_partition_order > MAX_PARTITION_ORDER) {
+ av_log(avctx, AV_LOG_ERROR, "invalid min partition order: %d\n",
+ avctx->min_partition_order);
+ return -1;
+ }
+ s->options.min_partition_order = avctx->min_partition_order;
+ }
+ if (avctx->max_partition_order >= 0) {
+ if (avctx->max_partition_order > MAX_PARTITION_ORDER) {
+ av_log(avctx, AV_LOG_ERROR, "invalid max partition order: %d\n",
+ avctx->max_partition_order);
+ return -1;
+ }
+ s->options.max_partition_order = avctx->max_partition_order;
+ }
+ if (s->options.max_partition_order < s->options.min_partition_order) {
+ av_log(avctx, AV_LOG_ERROR, "invalid partition orders: min=%d max=%d\n",
+ s->options.min_partition_order, s->options.max_partition_order);
+ return -1;
+ }
+
+ if (avctx->frame_size > 0) {
+ if (avctx->frame_size < FLAC_MIN_BLOCKSIZE ||
+ avctx->frame_size > FLAC_MAX_BLOCKSIZE) {
+ av_log(avctx, AV_LOG_ERROR, "invalid block size: %d\n",
+ avctx->frame_size);
+ return -1;
+ }
+ } else {
+ s->avctx->frame_size = select_blocksize(s->samplerate, s->options.block_time_ms);
+ }
+ s->max_blocksize = s->avctx->frame_size;
+
+ /* set LPC precision */
+ if (avctx->lpc_coeff_precision > 0) {
+ if (avctx->lpc_coeff_precision > MAX_LPC_PRECISION) {
+ av_log(avctx, AV_LOG_ERROR, "invalid lpc coeff precision: %d\n",
+ avctx->lpc_coeff_precision);
+ return -1;
+ }
+ s->options.lpc_coeff_precision = avctx->lpc_coeff_precision;
} else {
- s->max_framesize = 14 + (s->blocksize * s->channels * 2);
+ /* default LPC precision */
+ s->options.lpc_coeff_precision = 15;
}
+ /* set maximum encoded frame size in verbatim mode */
+ s->max_framesize = ff_flac_get_max_frame_size(s->avctx->frame_size,
+ s->channels, 16);
+
+ /* initialize MD5 context */
+ s->md5ctx = av_malloc(av_md5_size);
+ if (!s->md5ctx)
+ return AVERROR(ENOMEM);
+ av_md5_init(s->md5ctx);
+
streaminfo = av_malloc(FLAC_STREAMINFO_SIZE);
+ if (!streaminfo)
+ return AVERROR(ENOMEM);
write_streaminfo(s, streaminfo);
avctx->extradata = streaminfo;
avctx->extradata_size = FLAC_STREAMINFO_SIZE;
- s->frame_count = 0;
+ s->frame_count = 0;
+ s->min_framesize = s->max_framesize;
avctx->coded_frame = avcodec_alloc_frame();
- avctx->coded_frame->key_frame = 1;
+ if (!avctx->coded_frame)
+ return AVERROR(ENOMEM);
- return 0;
+ ret = ff_lpc_init(&s->lpc_ctx, avctx->frame_size,
+ s->options.max_prediction_order, AV_LPC_TYPE_LEVINSON);
+
+ dprint_compression_options(s);
+
+ return ret;
}
+
static void init_frame(FlacEncodeContext *s)
{
int i, ch;
frame = &s->frame;
- for(i=0; i<16; i++) {
- if(s->blocksize == flac_blocksizes[i]) {
- frame->blocksize = flac_blocksizes[i];
+ for (i = 0; i < 16; i++) {
+ if (s->avctx->frame_size == ff_flac_blocksize_table[i]) {
+ frame->blocksize = ff_flac_blocksize_table[i];
frame->bs_code[0] = i;
frame->bs_code[1] = 0;
break;
}
}
- if(i == 16) {
- frame->blocksize = s->blocksize;
- if(frame->blocksize <= 256) {
+ if (i == 16) {
+ frame->blocksize = s->avctx->frame_size;
+ if (frame->blocksize <= 256) {
frame->bs_code[0] = 6;
frame->bs_code[1] = frame->blocksize-1;
} else {
}
}
- for(ch=0; ch<s->channels; ch++) {
+ for (ch = 0; ch < s->channels; ch++)
frame->subframes[ch].obits = 16;
- }
+
+ frame->verbatim_only = 0;
}
+
/**
- * Copy channel-interleaved input samples into separate subframes
+ * Copy channel-interleaved input samples into separate subframes.
*/
-static void copy_samples(FlacEncodeContext *s, int16_t *samples)
+static void copy_samples(FlacEncodeContext *s, const int16_t *samples)
{
int i, j, ch;
FlacFrame *frame;
frame = &s->frame;
- for(i=0,j=0; i<frame->blocksize; i++) {
- for(ch=0; ch<s->channels; ch++,j++) {
+ for (i = 0, j = 0; i < frame->blocksize; i++)
+ for (ch = 0; ch < s->channels; ch++, j++)
frame->subframes[ch].samples[i] = samples[j];
- }
- }
}
-static int estimate_stereo_mode(int32_t *left_ch, int32_t *right_ch, int n)
+
+static int rice_count_exact(int32_t *res, int n, int k)
{
- int i, best;
- int32_t lt, rt;
- uint64_t left, right, mid, side;
- uint64_t score[4];
+ int i;
+ int count = 0;
- /* calculate sum of squares for each channel */
- left = right = mid = side = 0;
- for(i=2; i<n; i++) {
- lt = left_ch[i] - 2*left_ch[i-1] + left_ch[i-2];
- rt = right_ch[i] - 2*right_ch[i-1] + right_ch[i-2];
- mid += ABS((lt + rt) >> 1);
- side += ABS(lt - rt);
- left += ABS(lt);
- right += ABS(rt);
+ for (i = 0; i < n; i++) {
+ int32_t v = -2 * res[i] - 1;
+ v ^= v >> 31;
+ count += (v >> k) + 1 + k;
}
+ return count;
+}
- /* calculate score for each mode */
- score[0] = left + right;
- score[1] = left + side;
- score[2] = right + side;
- score[3] = mid + side;
- /* return mode with lowest score */
- best = 0;
- for(i=1; i<4; i++) {
- if(score[i] < score[best]) {
- best = i;
- }
- }
- if(best == 0) {
- return FLAC_CHMODE_LEFT_RIGHT;
- } else if(best == 1) {
- return FLAC_CHMODE_LEFT_SIDE;
- } else if(best == 2) {
- return FLAC_CHMODE_RIGHT_SIDE;
+static int subframe_count_exact(FlacEncodeContext *s, FlacSubframe *sub,
+ int pred_order)
+{
+ int p, porder, psize;
+ int i, part_end;
+ int count = 0;
+
+ /* subframe header */
+ count += 8;
+
+ /* subframe */
+ if (sub->type == FLAC_SUBFRAME_CONSTANT) {
+ count += sub->obits;
+ } else if (sub->type == FLAC_SUBFRAME_VERBATIM) {
+ count += s->frame.blocksize * sub->obits;
} else {
- return FLAC_CHMODE_MID_SIDE;
+ /* warm-up samples */
+ count += pred_order * sub->obits;
+
+ /* LPC coefficients */
+ if (sub->type == FLAC_SUBFRAME_LPC)
+ count += 4 + 5 + pred_order * s->options.lpc_coeff_precision;
+
+ /* rice-encoded block */
+ count += 2;
+
+ /* partition order */
+ porder = sub->rc.porder;
+ psize = s->frame.blocksize >> porder;
+ count += 4;
+
+ /* residual */
+ i = pred_order;
+ part_end = psize;
+ for (p = 0; p < 1 << porder; p++) {
+ int k = sub->rc.params[p];
+ count += 4;
+ count += rice_count_exact(&sub->residual[i], part_end - i, k);
+ i = part_end;
+ part_end = FFMIN(s->frame.blocksize, part_end + psize);
+ }
}
+
+ return count;
}
+
+#define rice_encode_count(sum, n, k) (((n)*((k)+1))+((sum-(n>>1))>>(k)))
+
/**
- * Perform stereo channel decorrelation
+ * Solve for d/dk(rice_encode_count) = n-((sum-(n>>1))>>(k+1)) = 0.
*/
-static void channel_decorrelation(FlacEncodeContext *ctx)
+static int find_optimal_param(uint32_t sum, int n)
{
- FlacFrame *frame;
- int32_t *left, *right;
- int i, n;
+ int k;
+ uint32_t sum2;
+
+ if (sum <= n >> 1)
+ return 0;
+ sum2 = sum - (n >> 1);
+ k = av_log2(n < 256 ? FASTDIV(sum2, n) : sum2 / n);
+ return FFMIN(k, MAX_RICE_PARAM);
+}
- frame = &ctx->frame;
- n = frame->blocksize;
- left = frame->subframes[0].samples;
- right = frame->subframes[1].samples;
- if(ctx->channels != 2) {
- frame->ch_mode = FLAC_CHMODE_NOT_STEREO;
- return;
+static uint32_t calc_optimal_rice_params(RiceContext *rc, int porder,
+ uint32_t *sums, int n, int pred_order)
+{
+ int i;
+ int k, cnt, part;
+ uint32_t all_bits;
+
+ part = (1 << porder);
+ all_bits = 4 * part;
+
+ cnt = (n >> porder) - pred_order;
+ for (i = 0; i < part; i++) {
+ k = find_optimal_param(sums[i], cnt);
+ rc->params[i] = k;
+ all_bits += rice_encode_count(sums[i], cnt, k);
+ cnt = n >> porder;
}
- frame->ch_mode = estimate_stereo_mode(left, right, n);
+ rc->porder = porder;
- /* perform decorrelation and adjust bits-per-sample */
- if(frame->ch_mode == FLAC_CHMODE_LEFT_RIGHT) {
- return;
+ return all_bits;
+}
+
+
+static void calc_sums(int pmin, int pmax, uint32_t *data, int n, int pred_order,
+ uint32_t sums[][MAX_PARTITIONS])
+{
+ int i, j;
+ int parts;
+ uint32_t *res, *res_end;
+
+ /* sums for highest level */
+ parts = (1 << pmax);
+ res = &data[pred_order];
+ res_end = &data[n >> pmax];
+ for (i = 0; i < parts; i++) {
+ uint32_t sum = 0;
+ while (res < res_end)
+ sum += *(res++);
+ sums[pmax][i] = sum;
+ res_end += n >> pmax;
}
- if(frame->ch_mode == FLAC_CHMODE_MID_SIDE) {
- int32_t tmp;
- for(i=0; i<n; i++) {
- tmp = left[i];
- left[i] = (tmp + right[i]) >> 1;
- right[i] = tmp - right[i];
- }
- frame->subframes[1].obits++;
- } else if(frame->ch_mode == FLAC_CHMODE_LEFT_SIDE) {
- for(i=0; i<n; i++) {
- right[i] = left[i] - right[i];
- }
- frame->subframes[1].obits++;
- } else {
- for(i=0; i<n; i++) {
- left[i] -= right[i];
- }
- frame->subframes[0].obits++;
+ /* sums for lower levels */
+ for (i = pmax - 1; i >= pmin; i--) {
+ parts = (1 << i);
+ for (j = 0; j < parts; j++)
+ sums[i][j] = sums[i+1][2*j] + sums[i+1][2*j+1];
}
}
-static void encode_residual_verbatim(FlacEncodeContext *s, int ch)
+
+static uint32_t calc_rice_params(RiceContext *rc, int pmin, int pmax,
+ int32_t *data, int n, int pred_order)
{
- FlacFrame *frame;
- FlacSubframe *sub;
- int32_t *res;
- int32_t *smp;
- int n;
+ int i;
+ uint32_t bits[MAX_PARTITION_ORDER+1];
+ int opt_porder;
+ RiceContext tmp_rc;
+ uint32_t *udata;
+ uint32_t sums[MAX_PARTITION_ORDER+1][MAX_PARTITIONS];
+
+ assert(pmin >= 0 && pmin <= MAX_PARTITION_ORDER);
+ assert(pmax >= 0 && pmax <= MAX_PARTITION_ORDER);
+ assert(pmin <= pmax);
+
+ udata = av_malloc(n * sizeof(uint32_t));
+ for (i = 0; i < n; i++)
+ udata[i] = (2*data[i]) ^ (data[i]>>31);
+
+ calc_sums(pmin, pmax, udata, n, pred_order, sums);
+
+ opt_porder = pmin;
+ bits[pmin] = UINT32_MAX;
+ for (i = pmin; i <= pmax; i++) {
+ bits[i] = calc_optimal_rice_params(&tmp_rc, i, sums[i], n, pred_order);
+ if (bits[i] <= bits[opt_porder]) {
+ opt_porder = i;
+ *rc = tmp_rc;
+ }
+ }
+
+ av_freep(&udata);
+ return bits[opt_porder];
+}
- frame = &s->frame;
- sub = &frame->subframes[ch];
- res = sub->residual;
- smp = sub->samples;
- n = frame->blocksize;
- sub->order = 0;
- sub->type = FLAC_SUBFRAME_VERBATIM;
- sub->type_code = sub->type;
+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;
+}
+
- memcpy(res, smp, n * sizeof(int32_t));
+static uint32_t find_subframe_rice_params(FlacEncodeContext *s,
+ FlacSubframe *sub, int pred_order)
+{
+ int pmin = get_max_p_order(s->options.min_partition_order,
+ s->frame.blocksize, pred_order);
+ int pmax = get_max_p_order(s->options.max_partition_order,
+ s->frame.blocksize, pred_order);
+
+ uint32_t bits = 8 + pred_order * sub->obits + 2 + 4;
+ if (sub->type == FLAC_SUBFRAME_LPC)
+ bits += 4 + 5 + pred_order * s->options.lpc_coeff_precision;
+ bits += calc_rice_params(&sub->rc, pmin, pmax, sub->residual,
+ s->frame.blocksize, pred_order);
+ return bits;
}
-static void encode_residual_fixed(int32_t *res, int32_t *smp, int n, int order)
+
+static void encode_residual_fixed(int32_t *res, const int32_t *smp, int n,
+ int order)
{
int i;
- for(i=0; i<order; 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;
+ }
}
+}
+
- 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){
- for(i=order; i<n; i++)
- res[i]= smp[i] - 2*smp[i-1] + smp[i-2];
- }else if(order==3){
- for(i=order; i<n; i++)
- res[i]= smp[i] - 3*smp[i-1] + 3*smp[i-2] - smp[i-3];
- }else{
- for(i=order; i<n; i++)
- res[i]= smp[i] - 4*smp[i-1] + 6*smp[i-2] - 4*smp[i-3] + smp[i-4];
+#define LPC1(x) {\
+ int c = coefs[(x)-1];\
+ p0 += c * s;\
+ s = smp[i-(x)+1];\
+ p1 += c * s;\
+}
+
+static av_always_inline void encode_residual_lpc_unrolled(int32_t *res,
+ const int32_t *smp, int n, int order,
+ const int32_t *coefs, int shift, int big)
+{
+ int i;
+ for (i = order; i < n; i += 2) {
+ int s = smp[i-order];
+ int p0 = 0, p1 = 0;
+ if (big) {
+ switch (order) {
+ case 32: LPC1(32)
+ case 31: LPC1(31)
+ case 30: LPC1(30)
+ case 29: LPC1(29)
+ case 28: LPC1(28)
+ case 27: LPC1(27)
+ case 26: LPC1(26)
+ case 25: LPC1(25)
+ case 24: LPC1(24)
+ case 23: LPC1(23)
+ case 22: LPC1(22)
+ case 21: LPC1(21)
+ case 20: LPC1(20)
+ case 19: LPC1(19)
+ case 18: LPC1(18)
+ case 17: LPC1(17)
+ case 16: LPC1(16)
+ case 15: LPC1(15)
+ case 14: LPC1(14)
+ case 13: LPC1(13)
+ case 12: LPC1(12)
+ case 11: LPC1(11)
+ case 10: LPC1(10)
+ case 9: LPC1( 9)
+ LPC1( 8)
+ LPC1( 7)
+ LPC1( 6)
+ LPC1( 5)
+ LPC1( 4)
+ LPC1( 3)
+ LPC1( 2)
+ LPC1( 1)
+ }
+ } else {
+ switch (order) {
+ case 8: LPC1( 8)
+ case 7: LPC1( 7)
+ case 6: LPC1( 6)
+ case 5: LPC1( 5)
+ case 4: LPC1( 4)
+ case 3: LPC1( 3)
+ case 2: LPC1( 2)
+ case 1: LPC1( 1)
+ }
+ }
+ res[i ] = smp[i ] - (p0 >> shift);
+ res[i+1] = smp[i+1] - (p1 >> shift);
}
}
-static void encode_residual(FlacEncodeContext *s, int ch)
+
+static void encode_residual_lpc(int32_t *res, const int32_t *smp, int n,
+ int order, const int32_t *coefs, int shift)
{
+ int i;
+ for (i = 0; i < order; i++)
+ res[i] = smp[i];
+#if CONFIG_SMALL
+ for (i = order; i < n; i += 2) {
+ int j;
+ int s = smp[i];
+ int p0 = 0, p1 = 0;
+ for (j = 0; j < order; j++) {
+ int c = coefs[j];
+ p1 += c * s;
+ s = smp[i-j-1];
+ p0 += c * s;
+ }
+ res[i ] = smp[i ] - (p0 >> shift);
+ res[i+1] = smp[i+1] - (p1 >> shift);
+ }
+#else
+ switch (order) {
+ case 1: encode_residual_lpc_unrolled(res, smp, n, 1, coefs, shift, 0); break;
+ case 2: encode_residual_lpc_unrolled(res, smp, n, 2, coefs, shift, 0); break;
+ case 3: encode_residual_lpc_unrolled(res, smp, n, 3, coefs, shift, 0); break;
+ case 4: encode_residual_lpc_unrolled(res, smp, n, 4, coefs, shift, 0); break;
+ case 5: encode_residual_lpc_unrolled(res, smp, n, 5, coefs, shift, 0); break;
+ case 6: encode_residual_lpc_unrolled(res, smp, n, 6, coefs, shift, 0); break;
+ case 7: encode_residual_lpc_unrolled(res, smp, n, 7, coefs, shift, 0); break;
+ case 8: encode_residual_lpc_unrolled(res, smp, n, 8, coefs, shift, 0); break;
+ default: encode_residual_lpc_unrolled(res, smp, n, order, coefs, shift, 1); break;
+ }
+#endif
+}
+
+
+static int encode_residual_ch(FlacEncodeContext *s, int ch)
+{
+ int i, n;
+ int min_order, max_order, opt_order, omethod;
FlacFrame *frame;
FlacSubframe *sub;
- int32_t *res;
- int32_t *smp;
- int n;
+ int32_t coefs[MAX_LPC_ORDER][MAX_LPC_ORDER];
+ int shift[MAX_LPC_ORDER];
+ int32_t *res, *smp;
frame = &s->frame;
- sub = &frame->subframes[ch];
- res = sub->residual;
- smp = sub->samples;
- n = frame->blocksize;
+ sub = &frame->subframes[ch];
+ res = sub->residual;
+ smp = sub->samples;
+ n = frame->blocksize;
+
+ /* CONSTANT */
+ for (i = 1; i < n; i++)
+ if(smp[i] != smp[0])
+ break;
+ if (i == n) {
+ sub->type = sub->type_code = FLAC_SUBFRAME_CONSTANT;
+ res[0] = smp[0];
+ return subframe_count_exact(s, sub, 0);
+ }
+
+ /* VERBATIM */
+ if (frame->verbatim_only || n < 5) {
+ sub->type = sub->type_code = FLAC_SUBFRAME_VERBATIM;
+ memcpy(res, smp, n * sizeof(int32_t));
+ return subframe_count_exact(s, sub, 0);
+ }
+
+ min_order = s->options.min_prediction_order;
+ max_order = s->options.max_prediction_order;
+ omethod = s->options.prediction_order_method;
- sub->order = 2;
+ /* FIXED */
sub->type = FLAC_SUBFRAME_FIXED;
- sub->type_code = sub->type | sub->order;
- encode_residual_fixed(res, smp, n, sub->order);
+ if (s->options.lpc_type == AV_LPC_TYPE_NONE ||
+ s->options.lpc_type == AV_LPC_TYPE_FIXED || n <= max_order) {
+ uint32_t bits[MAX_FIXED_ORDER+1];
+ if (max_order > MAX_FIXED_ORDER)
+ max_order = MAX_FIXED_ORDER;
+ opt_order = 0;
+ bits[0] = UINT32_MAX;
+ for (i = min_order; i <= max_order; i++) {
+ encode_residual_fixed(res, smp, n, i);
+ bits[i] = find_subframe_rice_params(s, sub, i);
+ if (bits[i] < bits[opt_order])
+ opt_order = i;
+ }
+ sub->order = opt_order;
+ sub->type_code = sub->type | sub->order;
+ if (sub->order != max_order) {
+ encode_residual_fixed(res, smp, n, sub->order);
+ find_subframe_rice_params(s, sub, sub->order);
+ }
+ return subframe_count_exact(s, sub, sub->order);
+ }
+
+ /* LPC */
+ sub->type = FLAC_SUBFRAME_LPC;
+ opt_order = ff_lpc_calc_coefs(&s->lpc_ctx, smp, n, min_order, max_order,
+ s->options.lpc_coeff_precision, coefs, shift, s->options.lpc_type,
+ s->options.lpc_passes, omethod,
+ MAX_LPC_SHIFT, 0);
+
+ if (omethod == ORDER_METHOD_2LEVEL ||
+ omethod == ORDER_METHOD_4LEVEL ||
+ omethod == ORDER_METHOD_8LEVEL) {
+ int levels = 1 << omethod;
+ uint32_t bits[1 << ORDER_METHOD_8LEVEL];
+ int order;
+ int opt_index = levels-1;
+ opt_order = max_order-1;
+ bits[opt_index] = UINT32_MAX;
+ for (i = levels-1; i >= 0; i--) {
+ order = min_order + (((max_order-min_order+1) * (i+1)) / levels)-1;
+ if (order < 0)
+ order = 0;
+ encode_residual_lpc(res, smp, n, order+1, coefs[order], shift[order]);
+ bits[i] = find_subframe_rice_params(s, sub, order+1);
+ if (bits[i] < bits[opt_index]) {
+ opt_index = i;
+ opt_order = order;
+ }
+ }
+ opt_order++;
+ } else if (omethod == ORDER_METHOD_SEARCH) {
+ // brute-force optimal order search
+ uint32_t bits[MAX_LPC_ORDER];
+ opt_order = 0;
+ bits[0] = UINT32_MAX;
+ for (i = min_order-1; i < max_order; i++) {
+ encode_residual_lpc(res, smp, n, i+1, coefs[i], shift[i]);
+ bits[i] = find_subframe_rice_params(s, sub, i+1);
+ if (bits[i] < bits[opt_order])
+ opt_order = i;
+ }
+ opt_order++;
+ } else if (omethod == ORDER_METHOD_LOG) {
+ uint32_t bits[MAX_LPC_ORDER];
+ int step;
+
+ opt_order = min_order - 1 + (max_order-min_order)/3;
+ memset(bits, -1, sizeof(bits));
+
+ for (step = 16; step; step >>= 1) {
+ int last = opt_order;
+ for (i = last-step; i <= last+step; i += step) {
+ if (i < min_order-1 || i >= max_order || bits[i] < UINT32_MAX)
+ continue;
+ encode_residual_lpc(res, smp, n, i+1, coefs[i], shift[i]);
+ bits[i] = find_subframe_rice_params(s, sub, i+1);
+ if (bits[i] < bits[opt_order])
+ opt_order = i;
+ }
+ }
+ opt_order++;
+ }
+
+ sub->order = opt_order;
+ sub->type_code = sub->type | (sub->order-1);
+ sub->shift = shift[sub->order-1];
+ for (i = 0; i < sub->order; i++)
+ sub->coefs[i] = coefs[sub->order-1][i];
+
+ encode_residual_lpc(res, smp, n, sub->order, sub->coefs, sub->shift);
+
+ find_subframe_rice_params(s, sub, sub->order);
+
+ return subframe_count_exact(s, sub, sub->order);
}
-static void
-put_sbits(PutBitContext *pb, int bits, int32_t val)
-{
- assert(bits >= 0 && bits <= 31);
- put_bits(pb, bits, val & ((1<<bits)-1));
+static int count_frame_header(FlacEncodeContext *s)
+{
+ uint8_t tmp;
+ int count;
+
+ /*
+ <14> Sync code
+ <1> Reserved
+ <1> Blocking strategy
+ <4> Block size in inter-channel samples
+ <4> Sample rate
+ <4> Channel assignment
+ <3> Sample size in bits
+ <1> Reserved
+ */
+ count = 32;
+
+ /* coded frame number */
+ PUT_UTF8(s->frame_count, tmp, count += 8;)
+
+ /* explicit block size */
+ if (s->frame.bs_code[0] == 6)
+ count += 8;
+ else if (s->frame.bs_code[0] == 7)
+ count += 16;
+
+ /* explicit sample rate */
+ count += ((s->sr_code[0] == 12) + (s->sr_code[0] > 12)) * 8;
+
+ /* frame header CRC-8 */
+ count += 8;
+
+ return count;
}
-static void
-write_utf8(PutBitContext *pb, uint32_t val)
+
+static int encode_frame(FlacEncodeContext *s)
{
- int bytes, shift;
+ int ch, count;
- if(val < 0x80){
- put_bits(pb, 8, val);
- return;
- }
+ count = count_frame_header(s);
- bytes= (av_log2(val)+4) / 5;
- shift = (bytes - 1) * 6;
- put_bits(pb, 8, (256 - (256>>bytes)) | (val >> shift));
- while(shift >= 6){
- shift -= 6;
- put_bits(pb, 8, 0x80 | ((val >> shift) & 0x3F));
- }
+ for (ch = 0; ch < s->channels; ch++)
+ count += encode_residual_ch(s, ch);
+
+ count += (8 - (count & 7)) & 7; // byte alignment
+ count += 16; // CRC-16
+
+ return count >> 3;
}
-static void
-output_frame_header(FlacEncodeContext *s)
-{
- FlacFrame *frame;
- int crc;
- frame = &s->frame;
+static int estimate_stereo_mode(int32_t *left_ch, int32_t *right_ch, int n)
+{
+ int i, best;
+ int32_t lt, rt;
+ uint64_t sum[4];
+ uint64_t score[4];
+ int k;
- 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_NOT_STEREO) {
- put_bits(&s->pb, 4, s->ch_code);
- } else {
- put_bits(&s->pb, 4, frame->ch_mode);
+ /* calculate sum of 2nd order residual for each channel */
+ sum[0] = sum[1] = sum[2] = sum[3] = 0;
+ for (i = 2; i < n; i++) {
+ lt = left_ch[i] - 2*left_ch[i-1] + left_ch[i-2];
+ rt = right_ch[i] - 2*right_ch[i-1] + right_ch[i-2];
+ sum[2] += FFABS((lt + rt) >> 1);
+ sum[3] += FFABS(lt - rt);
+ sum[0] += FFABS(lt);
+ sum[1] += FFABS(rt);
}
- put_bits(&s->pb, 3, 4); /* bits-per-sample code */
- put_bits(&s->pb, 1, 0);
- write_utf8(&s->pb, s->frame_count);
- if(frame->bs_code[0] == 6) {
- put_bits(&s->pb, 8, frame->bs_code[1]);
- } else if(frame->bs_code[0] == 7) {
- put_bits(&s->pb, 16, frame->bs_code[1]);
+ /* estimate bit counts */
+ for (i = 0; i < 4; i++) {
+ k = find_optimal_param(2 * sum[i], n);
+ sum[i] = rice_encode_count( 2 * sum[i], n, k);
}
- 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]);
+
+ /* calculate score for each mode */
+ score[0] = sum[0] + sum[1];
+ score[1] = sum[0] + sum[3];
+ score[2] = sum[1] + sum[3];
+ score[3] = sum[2] + sum[3];
+
+ /* return mode with lowest score */
+ best = 0;
+ for (i = 1; i < 4; i++)
+ if (score[i] < score[best])
+ best = i;
+ if (best == 0) {
+ return FLAC_CHMODE_INDEPENDENT;
+ } else if (best == 1) {
+ return FLAC_CHMODE_LEFT_SIDE;
+ } else if (best == 2) {
+ return FLAC_CHMODE_RIGHT_SIDE;
+ } else {
+ return FLAC_CHMODE_MID_SIDE;
}
- flush_put_bits(&s->pb);
- crc = av_crc(av_crc07, 0, s->pb.buf, put_bits_count(&s->pb)>>3);
- put_bits(&s->pb, 8, crc);
}
-static void output_subframe_verbatim(FlacEncodeContext *s, int ch)
+
+/**
+ * Perform stereo channel decorrelation.
+ */
+static void channel_decorrelation(FlacEncodeContext *s)
{
- int i;
FlacFrame *frame;
- FlacSubframe *sub;
- int32_t res;
+ int32_t *left, *right;
+ int i, n;
frame = &s->frame;
- sub = &frame->subframes[ch];
+ n = frame->blocksize;
+ left = frame->subframes[0].samples;
+ right = frame->subframes[1].samples;
- for(i=0; i<frame->blocksize; i++) {
- res = sub->residual[i];
- put_sbits(&s->pb, sub->obits, res);
+ if (s->channels != 2) {
+ frame->ch_mode = FLAC_CHMODE_INDEPENDENT;
+ return;
}
-}
-static void
-output_residual(FlacEncodeContext *ctx, int ch)
-{
- int i, j, p;
- int k, porder, psize, res_cnt;
- FlacFrame *frame;
- FlacSubframe *sub;
+ frame->ch_mode = estimate_stereo_mode(left, right, n);
- frame = &ctx->frame;
- sub = &frame->subframes[ch];
-
- /* rice-encoded block */
- put_bits(&ctx->pb, 2, 0);
-
- /* partition order */
- porder = 0;
- psize = frame->blocksize;
- //porder = sub->rc.porder;
- //psize = frame->blocksize >> porder;
- put_bits(&ctx->pb, 4, porder);
- res_cnt = psize - sub->order;
-
- /* residual */
- j = sub->order;
- for(p=0; p<(1 << porder); p++) {
- //k = sub->rc.params[p];
- k = 9;
- put_bits(&ctx->pb, 4, k);
- if(p == 1) res_cnt = psize;
- for(i=0; i<res_cnt && j<frame->blocksize; i++, j++) {
- set_sr_golomb_flac(&ctx->pb, sub->residual[j], k, INT32_MAX, 0);
+ /* perform decorrelation and adjust bits-per-sample */
+ if (frame->ch_mode == FLAC_CHMODE_INDEPENDENT)
+ return;
+ if (frame->ch_mode == FLAC_CHMODE_MID_SIDE) {
+ int32_t tmp;
+ for (i = 0; i < n; i++) {
+ tmp = left[i];
+ left[i] = (tmp + right[i]) >> 1;
+ right[i] = tmp - right[i];
}
+ frame->subframes[1].obits++;
+ } else if (frame->ch_mode == FLAC_CHMODE_LEFT_SIDE) {
+ for (i = 0; i < n; i++)
+ right[i] = left[i] - right[i];
+ frame->subframes[1].obits++;
+ } else {
+ for (i = 0; i < n; i++)
+ left[i] -= right[i];
+ frame->subframes[0].obits++;
}
}
-static void
-output_subframe_fixed(FlacEncodeContext *ctx, int ch)
+
+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)
{
- int i;
FlacFrame *frame;
- FlacSubframe *sub;
+ int crc;
- frame = &ctx->frame;
- sub = &frame->subframes[ch];
+ frame = &s->frame;
- /* warm-up samples */
- for(i=0; i<sub->order; i++) {
- put_sbits(&ctx->pb, sub->obits, sub->residual[i]);
- }
+ put_bits(&s->pb, 16, 0xFFF8);
+ put_bits(&s->pb, 4, frame->bs_code[0]);
+ put_bits(&s->pb, 4, s->sr_code[0]);
+
+ if (frame->ch_mode == FLAC_CHMODE_INDEPENDENT)
+ put_bits(&s->pb, 4, s->channels-1);
+ else
+ put_bits(&s->pb, 4, frame->ch_mode);
+
+ put_bits(&s->pb, 3, 4); /* bits-per-sample code */
+ put_bits(&s->pb, 1, 0);
+ write_utf8(&s->pb, s->frame_count);
+
+ if (frame->bs_code[0] == 6)
+ put_bits(&s->pb, 8, frame->bs_code[1]);
+ else if (frame->bs_code[0] == 7)
+ put_bits(&s->pb, 16, frame->bs_code[1]);
- /* residual */
- output_residual(ctx, ch);
+ if (s->sr_code[0] == 12)
+ put_bits(&s->pb, 8, s->sr_code[1]);
+ else if (s->sr_code[0] > 12)
+ put_bits(&s->pb, 16, s->sr_code[1]);
+
+ flush_put_bits(&s->pb);
+ crc = av_crc(av_crc_get_table(AV_CRC_8_ATM), 0, s->pb.buf,
+ put_bits_count(&s->pb) >> 3);
+ put_bits(&s->pb, 8, crc);
}
-static void output_subframes(FlacEncodeContext *s)
+
+static void write_subframes(FlacEncodeContext *s)
{
- FlacFrame *frame;
- FlacSubframe *sub;
int ch;
- frame = &s->frame;
-
- for(ch=0; ch<s->channels; ch++) {
- sub = &frame->subframes[ch];
+ for (ch = 0; ch < s->channels; ch++) {
+ FlacSubframe *sub = &s->frame.subframes[ch];
+ int i, p, porder, psize;
+ int32_t *part_end;
+ int32_t *res = sub->residual;
+ int32_t *frame_end = &sub->residual[s->frame.blocksize];
/* subframe header */
put_bits(&s->pb, 1, 0);
put_bits(&s->pb, 1, 0); /* no wasted bits */
/* subframe */
- if(sub->type == FLAC_SUBFRAME_VERBATIM) {
- output_subframe_verbatim(s, ch);
+ if (sub->type == FLAC_SUBFRAME_CONSTANT) {
+ put_sbits(&s->pb, sub->obits, res[0]);
+ } else if (sub->type == FLAC_SUBFRAME_VERBATIM) {
+ while (res < frame_end)
+ put_sbits(&s->pb, sub->obits, *res++);
} else {
- output_subframe_fixed(s, ch);
+ /* warm-up samples */
+ for (i = 0; i < sub->order; i++)
+ put_sbits(&s->pb, sub->obits, *res++);
+
+ /* LPC coefficients */
+ if (sub->type == FLAC_SUBFRAME_LPC) {
+ int cbits = s->options.lpc_coeff_precision;
+ put_bits( &s->pb, 4, cbits-1);
+ put_sbits(&s->pb, 5, sub->shift);
+ for (i = 0; i < sub->order; i++)
+ put_sbits(&s->pb, cbits, sub->coefs[i]);
+ }
+
+ /* rice-encoded block */
+ put_bits(&s->pb, 2, 0);
+
+ /* partition order */
+ porder = sub->rc.porder;
+ psize = s->frame.blocksize >> porder;
+ put_bits(&s->pb, 4, porder);
+
+ /* residual */
+ part_end = &sub->residual[psize];
+ for (p = 0; p < 1 << porder; p++) {
+ int k = sub->rc.params[p];
+ put_bits(&s->pb, 4, k);
+ while (res < part_end)
+ set_sr_golomb_flac(&s->pb, *res++, k, INT32_MAX, 0);
+ part_end = FFMIN(frame_end, part_end + psize);
+ }
}
}
}
-static void output_frame_footer(FlacEncodeContext *s)
+
+static void write_frame_footer(FlacEncodeContext *s)
{
int crc;
flush_put_bits(&s->pb);
- crc = bswap_16(av_crc(av_crc8005, 0, s->pb.buf, put_bits_count(&s->pb)>>3));
+ crc = av_bswap16(av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0, s->pb.buf,
+ put_bits_count(&s->pb)>>3));
put_bits(&s->pb, 16, crc);
flush_put_bits(&s->pb);
}
+
+static int write_frame(FlacEncodeContext *s, uint8_t *frame, int buf_size)
+{
+ init_put_bits(&s->pb, frame, buf_size);
+ write_frame_header(s);
+ write_subframes(s);
+ write_frame_footer(s);
+ return put_bits_count(&s->pb) >> 3;
+}
+
+
+static void update_md5_sum(FlacEncodeContext *s, const int16_t *samples)
+{
+#if HAVE_BIGENDIAN
+ int i;
+ for (i = 0; i < s->frame.blocksize * s->channels; i++) {
+ int16_t smp = av_le2ne16(samples[i]);
+ av_md5_update(s->md5ctx, (uint8_t *)&smp, 2);
+ }
+#else
+ av_md5_update(s->md5ctx, (const uint8_t *)samples, s->frame.blocksize*s->channels*2);
+#endif
+}
+
+
static int flac_encode_frame(AVCodecContext *avctx, uint8_t *frame,
int buf_size, void *data)
{
- int ch;
FlacEncodeContext *s;
- int16_t *samples = data;
- int out_bytes;
+ const int16_t *samples = data;
+ int frame_bytes, out_bytes;
s = avctx->priv_data;
- s->blocksize = avctx->frame_size;
+ /* when the last block is reached, update the header in extradata */
+ if (!data) {
+ s->max_framesize = s->max_encoded_framesize;
+ av_md5_final(s->md5ctx, s->md5sum);
+ write_streaminfo(s, avctx->extradata);
+ return 0;
+ }
+
+ /* change max_framesize for small final frame */
+ if (avctx->frame_size < s->frame.blocksize) {
+ s->max_framesize = ff_flac_get_max_frame_size(avctx->frame_size,
+ s->channels, 16);
+ }
+
init_frame(s);
copy_samples(s, samples);
channel_decorrelation(s);
- for(ch=0; ch<s->channels; ch++) {
- encode_residual(s, ch);
+ frame_bytes = encode_frame(s);
+
+ /* fallback to verbatim mode if the compressed frame is larger than it
+ would be if encoded uncompressed. */
+ if (frame_bytes > s->max_framesize) {
+ s->frame.verbatim_only = 1;
+ frame_bytes = encode_frame(s);
}
- init_put_bits(&s->pb, frame, buf_size);
- output_frame_header(s);
- output_subframes(s);
- output_frame_footer(s);
- out_bytes = put_bits_count(&s->pb) >> 3;
-
- if(out_bytes > s->max_framesize || out_bytes >= buf_size) {
- /* frame too large. use verbatim mode */
- for(ch=0; ch<s->channels; ch++) {
- encode_residual_verbatim(s, ch);
- }
- init_put_bits(&s->pb, frame, buf_size);
- output_frame_header(s);
- output_subframes(s);
- output_frame_footer(s);
- out_bytes = put_bits_count(&s->pb) >> 3;
-
- if(out_bytes > s->max_framesize || out_bytes >= buf_size) {
- /* still too large. must be an error. */
- av_log(avctx, AV_LOG_ERROR, "error encoding frame\n");
- return -1;
- }
+
+ if (buf_size < frame_bytes) {
+ av_log(avctx, AV_LOG_ERROR, "output buffer too small\n");
+ return 0;
}
+ out_bytes = write_frame(s, frame, buf_size);
s->frame_count++;
+ avctx->coded_frame->pts = s->sample_count;
+ s->sample_count += avctx->frame_size;
+ update_md5_sum(s, samples);
+ if (out_bytes > s->max_encoded_framesize)
+ s->max_encoded_framesize = out_bytes;
+ if (out_bytes < s->min_framesize)
+ s->min_framesize = out_bytes;
+
return out_bytes;
}
-static int flac_encode_close(AVCodecContext *avctx)
+
+static av_cold int flac_encode_close(AVCodecContext *avctx)
{
+ if (avctx->priv_data) {
+ FlacEncodeContext *s = avctx->priv_data;
+ av_freep(&s->md5ctx);
+ ff_lpc_end(&s->lpc_ctx);
+ }
av_freep(&avctx->extradata);
avctx->extradata_size = 0;
av_freep(&avctx->coded_frame);
return 0;
}
-AVCodec flac_encoder = {
+
+AVCodec ff_flac_encoder = {
"flac",
- CODEC_TYPE_AUDIO,
+ AVMEDIA_TYPE_AUDIO,
CODEC_ID_FLAC,
sizeof(FlacEncodeContext),
flac_encode_init,
flac_encode_frame,
flac_encode_close,
NULL,
- .capabilities = CODEC_CAP_SMALL_LAST_FRAME,
+ .capabilities = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY,
+ .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
+ .long_name = NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"),
};
projects / ffmpeg / blobdiff