/**
* FLAC audio encoder
- * Copyright (c) 2006 Justin Ruggles <jruggle@earthlink.net>
+ * Copyright (c) 2006 Justin Ruggles <justin.ruggles@gmail.com>
*
* This file is part of FFmpeg.
*
* 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 "dsputil.h"
#include "golomb.h"
-#include "lls.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 ORDER_METHOD_EST 0
-#define ORDER_METHOD_2LEVEL 1
-#define ORDER_METHOD_4LEVEL 2
-#define ORDER_METHOD_8LEVEL 3
-#define ORDER_METHOD_SEARCH 4
-#define ORDER_METHOD_LOG 5
-
-#define FLAC_STREAMINFO_SIZE 34
-
-#define MIN_LPC_ORDER 1
-#define MAX_LPC_ORDER 32
#define MAX_FIXED_ORDER 4
#define MAX_PARTITION_ORDER 8
#define MAX_PARTITIONS (1 << MAX_PARTITION_ORDER)
typedef struct CompressionOptions {
int compression_level;
int block_time_ms;
- int use_lpc;
+ enum AVLPCType lpc_type;
+ int lpc_passes;
int lpc_coeff_precision;
int min_prediction_order;
int max_prediction_order;
} 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;
+ DSPContext dsp;
+ 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);
}
+
/**
- * 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, int block_time_ms)
{
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;
s->avctx = avctx;
- if(avctx->sample_fmt != SAMPLE_FMT_S16) {
+ dsputil_init(&s->dsp, avctx);
+
+ if (avctx->sample_fmt != 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 {
}
/* set compression option defaults based on avctx->compression_level */
- if(avctx->compression_level < 0) {
+ if (avctx->compression_level < 0)
s->options.compression_level = 5;
- } else {
+ else
s->options.compression_level = avctx->compression_level;
- }
- av_log(avctx, AV_LOG_DEBUG, " compression: %d\n", s->options.compression_level);
- level= s->options.compression_level;
- if(level > 12) {
+ 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.use_lpc = ((int[]){ 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1})[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.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->use_lpc >= 0) {
- s->options.use_lpc = av_clip(avctx->use_lpc, 0, 11);
+#if FF_API_USE_LPC
+ /* for compatibility with deprecated AVCodecContext.use_lpc */
+ if (avctx->use_lpc == 0) {
+ s->options.lpc_type = AV_LPC_TYPE_FIXED;
+ } else if (avctx->use_lpc == 1) {
+ s->options.lpc_type = AV_LPC_TYPE_LEVINSON;
+ } else if (avctx->use_lpc > 1) {
+ s->options.lpc_type = AV_LPC_TYPE_CHOLESKY;
+ s->options.lpc_passes = avctx->use_lpc - 1;
}
- if(s->options.use_lpc == 1)
- av_log(avctx, AV_LOG_DEBUG, " use lpc: Levinson-Durbin recursion with Welch window\n");
- else if(s->options.use_lpc > 1)
- av_log(avctx, AV_LOG_DEBUG, " use lpc: Cholesky factorization\n");
-
- if(avctx->min_prediction_order >= 0) {
- if(s->options.use_lpc) {
- 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);
+#endif
+ 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;
}
- } else {
- if(avctx->min_prediction_order > MAX_FIXED_ORDER) {
+ }
+ }
+
+ 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(avctx->max_prediction_order >= 0) {
- if(s->options.use_lpc) {
- 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;
- }
- } else {
- if(avctx->max_prediction_order > MAX_FIXED_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) {
+ 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;
}
- av_log(avctx, AV_LOG_DEBUG, " prediction order: %d, %d\n",
- s->options.min_prediction_order, s->options.max_prediction_order);
- if(avctx->prediction_order_method >= 0) {
- if(avctx->prediction_order_method > ORDER_METHOD_LOG) {
+ 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;
}
- switch(s->options.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;
- }
- if(avctx->min_partition_order >= 0) {
- if(avctx->min_partition_order > MAX_PARTITION_ORDER) {
+ 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) {
+ 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) {
+ 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;
}
- av_log(avctx, AV_LOG_DEBUG, " partition order: %d, %d\n",
- s->options.min_partition_order, s->options.max_partition_order);
- if(avctx->frame_size > 0) {
- if(avctx->frame_size < FLAC_MIN_BLOCKSIZE ||
+ 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;
}
- s->blocksize = avctx->frame_size;
} else {
- s->blocksize = select_blocksize(s->samplerate, s->options.block_time_ms);
- avctx->frame_size = s->blocksize;
+ s->avctx->frame_size = select_blocksize(s->samplerate, s->options.block_time_ms);
}
- av_log(avctx, AV_LOG_DEBUG, " block size: %d\n", s->blocksize);
+ s->max_blocksize = s->avctx->frame_size;
/* set LPC precision */
- if(avctx->lpc_coeff_precision > 0) {
- if(avctx->lpc_coeff_precision > MAX_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 {
- /* select LPC precision based on block size */
- if( s->blocksize <= 192) s->options.lpc_coeff_precision = 7;
- else if(s->blocksize <= 384) s->options.lpc_coeff_precision = 8;
- else if(s->blocksize <= 576) s->options.lpc_coeff_precision = 9;
- else if(s->blocksize <= 1152) s->options.lpc_coeff_precision = 10;
- else if(s->blocksize <= 2304) s->options.lpc_coeff_precision = 11;
- else if(s->blocksize <= 4608) s->options.lpc_coeff_precision = 12;
- else if(s->blocksize <= 8192) s->options.lpc_coeff_precision = 13;
- else if(s->blocksize <= 16384) s->options.lpc_coeff_precision = 14;
- else s->options.lpc_coeff_precision = 15;
+ /* default LPC precision */
+ s->options.lpc_coeff_precision = 15;
}
- av_log(avctx, AV_LOG_DEBUG, " lpc precision: %d\n",
- s->options.lpc_coeff_precision);
/* set maximum encoded frame size in verbatim mode */
- if(s->channels == 2) {
- s->max_framesize = 14 + ((s->blocksize * 33 + 7) >> 3);
- } else {
- s->max_framesize = 14 + (s->blocksize * s->channels * 2);
- }
+ 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);
+
+ dprint_compression_options(s);
return 0;
}
+
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 rice_count_exact(int32_t *res, int n, int k)
+{
+ int i;
+ int count = 0;
+
+ for (i = 0; i < n; i++) {
+ int32_t v = -2 * res[i] - 1;
+ v ^= v >> 31;
+ count += (v >> k) + 1 + k;
+ }
+ return count;
+}
+
+
+static 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 {
+ /* 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)))
+/**
+ * Solve for d/dk(rice_encode_count) = n-((sum-(n>>1))>>(k+1)) = 0.
+ */
static int find_optimal_param(uint32_t sum, int n)
{
- int k, k_opt;
- uint32_t nbits[MAX_RICE_PARAM+1];
-
- k_opt = 0;
- nbits[0] = UINT32_MAX;
- for(k=0; k<=MAX_RICE_PARAM; k++) {
- nbits[k] = rice_encode_count(sum, n, k);
- if(nbits[k] < nbits[k_opt]) {
- k_opt = k;
- }
- }
- return k_opt;
+ int k;
+ uint32_t sum2;
+
+ if (sum <= n >> 1)
+ return 0;
+ sum2 = sum - (n >> 1);
+ k = av_log2(n < 256 ? FASTDIV(sum2, n) : sum2 / n);
+ return FFMIN(k, MAX_RICE_PARAM);
}
+
static uint32_t calc_optimal_rice_params(RiceContext *rc, int porder,
uint32_t *sums, int n, int pred_order)
{
int k, cnt, part;
uint32_t all_bits;
- part = (1 << porder);
- all_bits = 0;
+ part = (1 << porder);
+ all_bits = 4 * part;
cnt = (n >> porder) - pred_order;
- for(i=0; i<part; i++) {
- if(i == 1) cnt = (n >> porder);
+ 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;
}
- all_bits += (4 * part);
rc->porder = porder;
return all_bits;
}
+
static void calc_sums(int pmin, int pmax, uint32_t *data, int n, int pred_order,
uint32_t sums[][MAX_PARTITIONS])
{
uint32_t *res, *res_end;
/* sums for highest level */
- parts = (1 << pmax);
- res = &data[pred_order];
+ parts = (1 << pmax);
+ res = &data[pred_order];
res_end = &data[n >> pmax];
- for(i=0; i<parts; i++) {
- sums[pmax][i] = 0;
- while(res < res_end){
- sums[pmax][i] += *(res++);
- }
- res_end+= n >> pmax;
+ for (i = 0; i < parts; i++) {
+ uint32_t sum = 0;
+ while (res < res_end)
+ sum += *(res++);
+ sums[pmax][i] = sum;
+ res_end += n >> pmax;
}
/* sums for lower levels */
- for(i=pmax-1; i>=pmin; i--) {
+ for (i = pmax - 1; i >= pmin; i--) {
parts = (1 << i);
- for(j=0; j<parts; j++) {
+ for (j = 0; j < parts; j++)
sums[i][j] = sums[i+1][2*j] + sums[i+1][2*j+1];
- }
}
}
+
static uint32_t calc_rice_params(RiceContext *rc, int pmin, int pmax,
int32_t *data, int n, int pred_order)
{
assert(pmin <= pmax);
udata = av_malloc(n * sizeof(uint32_t));
- for(i=0; i<n; i++) {
+ 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++) {
+ 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]) {
+ if (bits[i] <= bits[opt_porder]) {
opt_porder = i;
- *rc= tmp_rc;
+ *rc = tmp_rc;
}
}
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)
+ if (order > 0)
porder = FFMIN(porder, av_log2(n/order));
return porder;
}
-static uint32_t calc_rice_params_fixed(RiceContext *rc, int pmin, int pmax,
- int32_t *data, int n, int pred_order,
- int bps)
-{
- uint32_t bits;
- pmin = get_max_p_order(pmin, n, pred_order);
- pmax = get_max_p_order(pmax, n, pred_order);
- bits = pred_order*bps + 6;
- bits += calc_rice_params(rc, pmin, pmax, data, n, pred_order);
- return bits;
-}
-static uint32_t calc_rice_params_lpc(RiceContext *rc, int pmin, int pmax,
- int32_t *data, int n, int pred_order,
- int bps, int precision)
+static uint32_t find_subframe_rice_params(FlacEncodeContext *s,
+ FlacSubframe *sub, int pred_order)
{
- uint32_t bits;
- pmin = get_max_p_order(pmin, n, pred_order);
- pmax = get_max_p_order(pmax, n, pred_order);
- bits = pred_order*bps + 4 + 5 + pred_order*precision + 6;
- bits += calc_rice_params(rc, pmin, pmax, data, n, 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;
}
-/**
- * Apply Welch window function to audio block
- */
-static void apply_welch_window(const int32_t *data, int len, double *w_data)
-{
- int i, n2;
- double w;
- double c;
-
- n2 = (len >> 1);
- c = 2.0 / (len - 1.0);
- for(i=0; i<n2; i++) {
- w = c - i - 1.0;
- w = 1.0 - (w * w);
- w_data[i] = data[i] * w;
- w_data[len-1-i] = data[len-1-i] * w;
- }
-}
-
-/**
- * Calculates autocorrelation data from audio samples
- * A Welch window function is applied before calculation.
- */
-static void compute_autocorr(const int32_t *data, int len, int lag,
- double *autoc)
-{
- int i, lag_ptr;
- double tmp[len + lag];
- double *data1= tmp + lag;
-
- apply_welch_window(data, len, data1);
-
- for(i=0; i<lag; i++){
- autoc[i] = 1.0;
- data1[i-lag]= 0.0;
- }
-
- for(i=0; i<len; i++){
- for(lag_ptr= i-lag; lag_ptr<=i; lag_ptr++){
- autoc[i-lag_ptr] += data1[i] * data1[lag_ptr];
- }
- }
-}
-/**
- * Levinson-Durbin recursion.
- * Produces LPC coefficients from autocorrelation data.
- */
-static void compute_lpc_coefs(const double *autoc, int max_order,
- double lpc[][MAX_LPC_ORDER], double *ref)
-{
- int i, j, i2;
- double r, err, tmp;
- double lpc_tmp[MAX_LPC_ORDER];
-
- for(i=0; i<max_order; i++) lpc_tmp[i] = 0;
- err = autoc[0];
-
- for(i=0; i<max_order; i++) {
- r = -autoc[i+1];
- for(j=0; j<i; j++) {
- r -= lpc_tmp[j] * autoc[i-j];
- }
- r /= err;
- ref[i] = fabs(r);
-
- err *= 1.0 - (r * r);
-
- i2 = (i >> 1);
- lpc_tmp[i] = r;
- for(j=0; j<i2; j++) {
- tmp = lpc_tmp[j];
- lpc_tmp[j] += r * lpc_tmp[i-1-j];
- lpc_tmp[i-1-j] += r * tmp;
- }
- if(i & 1) {
- lpc_tmp[j] += lpc_tmp[j] * r;
- }
-
- for(j=0; j<=i; j++) {
- lpc[i][j] = -lpc_tmp[j];
- }
- }
-}
-
-/**
- * Quantize LPC coefficients
- */
-static void quantize_lpc_coefs(double *lpc_in, int order, int precision,
- int32_t *lpc_out, int *shift)
+static void encode_residual_fixed(int32_t *res, const int32_t *smp, int n,
+ int order)
{
int i;
- double cmax, error;
- int32_t qmax;
- int sh;
-
- /* define maximum levels */
- qmax = (1 << (precision - 1)) - 1;
-
- /* find maximum coefficient value */
- cmax = 0.0;
- for(i=0; i<order; i++) {
- cmax= FFMAX(cmax, fabs(lpc_in[i]));
- }
-
- /* if maximum value quantizes to zero, return all zeros */
- if(cmax * (1 << MAX_LPC_SHIFT) < 1.0) {
- *shift = 0;
- memset(lpc_out, 0, sizeof(int32_t) * order);
- return;
- }
-
- /* calculate level shift which scales max coeff to available bits */
- sh = MAX_LPC_SHIFT;
- while((cmax * (1 << sh) > qmax) && (sh > 0)) {
- sh--;
- }
-
- /* since negative shift values are unsupported in decoder, scale down
- coefficients instead */
- if(sh == 0 && cmax > qmax) {
- double scale = ((double)qmax) / cmax;
- for(i=0; i<order; i++) {
- lpc_in[i] *= scale;
- }
- }
-
- /* output quantized coefficients and level shift */
- error=0;
- for(i=0; i<order; i++) {
- error += lpc_in[i] * (1 << sh);
- lpc_out[i] = av_clip(lrintf(error), -qmax, qmax);
- error -= lpc_out[i];
- }
- *shift = sh;
-}
-
-static int estimate_best_order(double *ref, int max_order)
-{
- int i, est;
- est = 1;
- for(i=max_order-1; i>=0; i--) {
- if(ref[i] > 0.10) {
- est = i+1;
- break;
- }
- }
- return est;
-}
+ for (i = 0; i < order; i++)
+ res[i] = smp[i];
-/**
- * Calculate LPC coefficients for multiple orders
- */
-static int lpc_calc_coefs(const int32_t *samples, int blocksize, int max_order,
- int precision, int32_t coefs[][MAX_LPC_ORDER],
- int *shift, int use_lpc, int omethod)
-{
- double autoc[MAX_LPC_ORDER+1];
- double ref[MAX_LPC_ORDER];
- double lpc[MAX_LPC_ORDER][MAX_LPC_ORDER];
- int i, j, pass;
- int opt_order;
-
- assert(max_order >= MIN_LPC_ORDER && max_order <= MAX_LPC_ORDER);
-
- if(use_lpc == 1){
- compute_autocorr(samples, blocksize, max_order+1, autoc);
-
- compute_lpc_coefs(autoc, max_order, lpc, ref);
- }else{
- LLSModel m[2];
- double var[MAX_LPC_ORDER+1], eval, weight;
-
- for(pass=0; pass<use_lpc-1; pass++){
- av_init_lls(&m[pass&1], max_order);
-
- weight=0;
- for(i=max_order; i<blocksize; i++){
- for(j=0; j<=max_order; j++)
- var[j]= samples[i-j];
-
- if(pass){
- eval= av_evaluate_lls(&m[(pass-1)&1], var+1, max_order-1);
- eval= (512>>pass) + fabs(eval - var[0]);
- for(j=0; j<=max_order; j++)
- var[j]/= sqrt(eval);
- weight += 1/eval;
- }else
- weight++;
-
- av_update_lls(&m[pass&1], var, 1.0);
- }
- av_solve_lls(&m[pass&1], 0.001, 0);
+ 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;
}
-
- for(i=0; i<max_order; i++){
- for(j=0; j<max_order; j++)
- lpc[i][j]= m[(pass-1)&1].coeff[i][j];
- ref[i]= sqrt(m[(pass-1)&1].variance[i] / weight) * (blocksize - max_order) / 4000;
+ } 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;
}
- for(i=max_order-1; i>0; i--)
- ref[i] = ref[i-1] - ref[i];
- }
- opt_order = max_order;
-
- if(omethod == ORDER_METHOD_EST) {
- opt_order = estimate_best_order(ref, max_order);
- i = opt_order-1;
- quantize_lpc_coefs(lpc[i], i+1, precision, coefs[i], &shift[i]);
} else {
- for(i=0; i<max_order; i++) {
- quantize_lpc_coefs(lpc[i], i+1, precision, coefs[i], &shift[i]);
+ 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;
}
}
-
- return opt_order;
-}
-
-
-static void encode_residual_verbatim(int32_t *res, int32_t *smp, int n)
-{
- assert(n > 0);
- memcpy(res, smp, n * sizeof(int32_t));
}
-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){
- 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 s = smp[i-(x)+1];\
- p1 += c*s;\
- c = coefs[(x)-2];\
- p0 += c*s;\
+ 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)
+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 c = coefs[order-1];
- int p0 = c * smp[i-order];
- int 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)
+ 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)
+ 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)
}
}
- p1 += c * smp[i];
res[i ] = smp[i ] - (p0 >> shift);
res[i+1] = smp[i+1] - (p1 >> shift);
}
}
+
static void encode_residual_lpc(int32_t *res, const int32_t *smp, int n,
int order, const int32_t *coefs, int shift)
{
int i;
- for(i=0; i<order; i++) {
+ for (i = 0; i < order; i++)
res[i] = smp[i];
- }
-#ifdef CONFIG_SMALL
- for(i=order; i<n; i+=2) {
+#if CONFIG_SMALL
+ for (i = order; i < n; i += 2) {
int j;
- int32_t c = coefs[0];
- int32_t p0 = 0, p1 = c*smp[i];
- for(j=1; j<order; j++) {
- int32_t s = smp[i-j];
- p0 += c*s;
- c = coefs[j];
- p1 += c*s;
+ 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;
}
- p0 += c*smp[i-order];
- res[i+0] = smp[i+0] - (p0 >> shift);
+ 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;
+ 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(FlacEncodeContext *ctx, int ch)
+
+static int encode_residual_ch(FlacEncodeContext *s, int ch)
{
int i, n;
- int min_order, max_order, opt_order, precision, omethod;
- int min_porder, max_porder;
+ int min_order, max_order, opt_order, omethod;
FlacFrame *frame;
FlacSubframe *sub;
int32_t coefs[MAX_LPC_ORDER][MAX_LPC_ORDER];
int shift[MAX_LPC_ORDER];
int32_t *res, *smp;
- frame = &ctx->frame;
- sub = &frame->subframes[ch];
- res = sub->residual;
- smp = sub->samples;
- n = frame->blocksize;
+ frame = &s->frame;
+ sub = &frame->subframes[ch];
+ res = sub->residual;
+ smp = sub->samples;
+ n = frame->blocksize;
/* CONSTANT */
- for(i=1; i<n; i++) {
- if(smp[i] != smp[0]) break;
- }
- if(i == n) {
+ 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 sub->obits;
+ return subframe_count_exact(s, sub, 0);
}
/* VERBATIM */
- if(n < 5) {
+ if (frame->verbatim_only || n < 5) {
sub->type = sub->type_code = FLAC_SUBFRAME_VERBATIM;
- encode_residual_verbatim(res, smp, n);
- return sub->obits * n;
+ memcpy(res, smp, n * sizeof(int32_t));
+ return subframe_count_exact(s, sub, 0);
}
- min_order = ctx->options.min_prediction_order;
- max_order = ctx->options.max_prediction_order;
- min_porder = ctx->options.min_partition_order;
- max_porder = ctx->options.max_partition_order;
- precision = ctx->options.lpc_coeff_precision;
- omethod = ctx->options.prediction_order_method;
+ min_order = s->options.min_prediction_order;
+ max_order = s->options.max_prediction_order;
+ omethod = s->options.prediction_order_method;
/* FIXED */
- if(!ctx->options.use_lpc || max_order == 0 || (n <= max_order)) {
+ sub->type = FLAC_SUBFRAME_FIXED;
+ 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;
+ 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++) {
+ bits[0] = UINT32_MAX;
+ for (i = min_order; i <= max_order; i++) {
encode_residual_fixed(res, smp, n, i);
- bits[i] = calc_rice_params_fixed(&sub->rc, min_porder, max_porder, res,
- n, i, sub->obits);
- if(bits[i] < bits[opt_order]) {
+ bits[i] = find_subframe_rice_params(s, sub, i);
+ if (bits[i] < bits[opt_order])
opt_order = i;
- }
}
- sub->order = opt_order;
- sub->type = FLAC_SUBFRAME_FIXED;
+ sub->order = opt_order;
sub->type_code = sub->type | sub->order;
- if(sub->order != max_order) {
+ if (sub->order != max_order) {
encode_residual_fixed(res, smp, n, sub->order);
- return calc_rice_params_fixed(&sub->rc, min_porder, max_porder, res, n,
- sub->order, sub->obits);
+ find_subframe_rice_params(s, sub, sub->order);
}
- return bits[sub->order];
+ return subframe_count_exact(s, sub, sub->order);
}
/* LPC */
- opt_order = lpc_calc_coefs(smp, n, max_order, precision, coefs, shift, ctx->options.use_lpc, omethod);
-
- if(omethod == ORDER_METHOD_2LEVEL ||
- omethod == ORDER_METHOD_4LEVEL ||
- omethod == ORDER_METHOD_8LEVEL) {
+ sub->type = FLAC_SUBFRAME_LPC;
+ opt_order = ff_lpc_calc_coefs(&s->dsp, 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[levels];
+ uint32_t bits[1 << ORDER_METHOD_8LEVEL];
int order;
- int opt_index = levels-1;
- opt_order = max_order-1;
+ int opt_index = levels-1;
+ opt_order = max_order-1;
bits[opt_index] = UINT32_MAX;
- for(i=levels-1; i>=0; i--) {
+ for (i = levels-1; i >= 0; i--) {
order = min_order + (((max_order-min_order+1) * (i+1)) / levels)-1;
- if(order < 0) order = 0;
+ if (order < 0)
+ order = 0;
encode_residual_lpc(res, smp, n, order+1, coefs[order], shift[order]);
- bits[i] = calc_rice_params_lpc(&sub->rc, min_porder, max_porder,
- res, n, order+1, sub->obits, precision);
- if(bits[i] < bits[opt_index]) {
+ 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) {
+ } 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++) {
+ 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] = calc_rice_params_lpc(&sub->rc, min_porder, max_porder,
- res, n, i+1, sub->obits, precision);
- if(bits[i] < bits[opt_order]) {
+ 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) {
+ } else if (omethod == ORDER_METHOD_LOG) {
uint32_t bits[MAX_LPC_ORDER];
int step;
- opt_order= min_order - 1 + (max_order-min_order)/3;
+ 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)
+ 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] = calc_rice_params_lpc(&sub->rc, min_porder, max_porder,
- res, n, i+1, sub->obits, precision);
- if(bits[i] < bits[opt_order])
- opt_order= 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 = FLAC_SUBFRAME_LPC;
+ 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->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);
- return calc_rice_params_lpc(&sub->rc, min_porder, max_porder, res, n, sub->order,
- sub->obits, precision);
+
+ find_subframe_rice_params(s, sub, sub->order);
+
+ return subframe_count_exact(s, sub, sub->order);
}
-static int encode_residual_v(FlacEncodeContext *ctx, int ch)
+
+static int count_frame_header(FlacEncodeContext *s)
{
- int i, n;
- FlacFrame *frame;
- FlacSubframe *sub;
- int32_t *res, *smp;
+ 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;
+}
- frame = &ctx->frame;
- sub = &frame->subframes[ch];
- res = sub->residual;
- smp = sub->samples;
- n = frame->blocksize;
- /* CONSTANT */
- for(i=1; i<n; i++) {
- if(smp[i] != smp[0]) break;
- }
- if(i == n) {
- sub->type = sub->type_code = FLAC_SUBFRAME_CONSTANT;
- res[0] = smp[0];
- return sub->obits;
- }
+static int encode_frame(FlacEncodeContext *s)
+{
+ int ch, count;
- /* VERBATIM */
- sub->type = sub->type_code = FLAC_SUBFRAME_VERBATIM;
- encode_residual_verbatim(res, smp, n);
- return sub->obits * n;
+ count = count_frame_header(s);
+
+ for (ch = 0; ch < s->channels; ch++)
+ count += encode_residual_ch(s, ch);
+
+ count += (8 - (count & 7)) & 7; // byte alignment
+ count += 16; // CRC-16
+
+ return count >> 3;
}
+
static int estimate_stereo_mode(int32_t *left_ch, int32_t *right_ch, int n)
{
int i, best;
/* 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];
+ 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[1] += FFABS(rt);
}
/* estimate bit counts */
- for(i=0; i<4; i++) {
- k = find_optimal_param(2*sum[i], n);
- sum[i] = rice_encode_count(2*sum[i], n, k);
+ for (i = 0; i < 4; i++) {
+ k = find_optimal_param(2 * sum[i], n);
+ sum[i] = rice_encode_count( 2 * sum[i], n, k);
}
/* calculate score for each mode */
/* return mode with lowest score */
best = 0;
- for(i=1; i<4; i++) {
- if(score[i] < score[best]) {
+ 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) {
+ if (best == 0) {
+ return FLAC_CHMODE_INDEPENDENT;
+ } else if (best == 1) {
return FLAC_CHMODE_LEFT_SIDE;
- } else if(best == 2) {
+ } else if (best == 2) {
return FLAC_CHMODE_RIGHT_SIDE;
} else {
return FLAC_CHMODE_MID_SIDE;
}
}
+
/**
- * Perform stereo channel decorrelation
+ * Perform stereo channel decorrelation.
*/
-static void channel_decorrelation(FlacEncodeContext *ctx)
+static void channel_decorrelation(FlacEncodeContext *s)
{
FlacFrame *frame;
int32_t *left, *right;
int i, n;
- frame = &ctx->frame;
- n = frame->blocksize;
+ frame = &s->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;
+ if (s->channels != 2) {
+ frame->ch_mode = FLAC_CHMODE_INDEPENDENT;
return;
}
frame->ch_mode = estimate_stereo_mode(left, right, n);
/* perform decorrelation and adjust bits-per-sample */
- if(frame->ch_mode == FLAC_CHMODE_LEFT_RIGHT) {
+ if (frame->ch_mode == FLAC_CHMODE_INDEPENDENT)
return;
- }
- if(frame->ch_mode == FLAC_CHMODE_MID_SIDE) {
+ 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];
+ 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++) {
+ } 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++) {
+ for (i = 0; i < n; i++)
left[i] -= right[i];
- }
frame->subframes[0].obits++;
}
}
-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 void write_utf8(PutBitContext *pb, uint32_t val)
{
PUT_UTF8(val, tmp, put_bits(pb, 8, tmp);)
}
-static void output_frame_header(FlacEncodeContext *s)
+
+static void write_frame_header(FlacEncodeContext *s)
{
FlacFrame *frame;
int crc;
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 {
+
+ 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) {
+
+ if (frame->bs_code[0] == 6)
put_bits(&s->pb, 8, frame->bs_code[1]);
- } else if(frame->bs_code[0] == 7) {
+ else if (frame->bs_code[0] == 7)
put_bits(&s->pb, 16, frame->bs_code[1]);
- }
- if(s->sr_code[0] == 12) {
+
+ if (s->sr_code[0] == 12)
put_bits(&s->pb, 8, s->sr_code[1]);
- } else if(s->sr_code[0] > 12) {
+ 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_crc07, 0, s->pb.buf, put_bits_count(&s->pb)>>3);
+ 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_subframe_constant(FlacEncodeContext *s, int ch)
-{
- FlacSubframe *sub;
- int32_t res;
-
- sub = &s->frame.subframes[ch];
- res = sub->residual[0];
- put_sbits(&s->pb, sub->obits, res);
-}
-
-static void output_subframe_verbatim(FlacEncodeContext *s, int ch)
-{
- int i;
- FlacFrame *frame;
- FlacSubframe *sub;
- int32_t res;
-
- frame = &s->frame;
- sub = &frame->subframes[ch];
-
- for(i=0; i<frame->blocksize; i++) {
- res = sub->residual[i];
- put_sbits(&s->pb, sub->obits, res);
- }
-}
-
-static void output_residual(FlacEncodeContext *ctx, int ch)
-{
- int i, j, p, n, parts;
- int k, porder, psize, res_cnt;
- FlacFrame *frame;
- FlacSubframe *sub;
- int32_t *res;
-
- frame = &ctx->frame;
- sub = &frame->subframes[ch];
- res = sub->residual;
- n = frame->blocksize;
-
- /* rice-encoded block */
- put_bits(&ctx->pb, 2, 0);
-
- /* partition order */
- porder = sub->rc.porder;
- psize = n >> porder;
- parts = (1 << porder);
- put_bits(&ctx->pb, 4, porder);
- res_cnt = psize - sub->order;
-
- /* residual */
- j = sub->order;
- for(p=0; p<parts; p++) {
- k = sub->rc.params[p];
- put_bits(&ctx->pb, 4, k);
- if(p == 1) res_cnt = psize;
- for(i=0; i<res_cnt && j<n; i++, j++) {
- set_sr_golomb_flac(&ctx->pb, res[j], k, INT32_MAX, 0);
- }
- }
-}
-static void output_subframe_fixed(FlacEncodeContext *ctx, int ch)
+static void write_subframes(FlacEncodeContext *s)
{
- int i;
- FlacFrame *frame;
- FlacSubframe *sub;
-
- frame = &ctx->frame;
- sub = &frame->subframes[ch];
-
- /* warm-up samples */
- for(i=0; i<sub->order; i++) {
- put_sbits(&ctx->pb, sub->obits, sub->residual[i]);
- }
-
- /* residual */
- output_residual(ctx, ch);
-}
-
-static void output_subframe_lpc(FlacEncodeContext *ctx, int ch)
-{
- int i, cbits;
- FlacFrame *frame;
- FlacSubframe *sub;
-
- frame = &ctx->frame;
- sub = &frame->subframes[ch];
-
- /* warm-up samples */
- for(i=0; i<sub->order; i++) {
- put_sbits(&ctx->pb, sub->obits, sub->residual[i]);
- }
-
- /* LPC coefficients */
- cbits = ctx->options.lpc_coeff_precision;
- put_bits(&ctx->pb, 4, cbits-1);
- put_sbits(&ctx->pb, 5, sub->shift);
- for(i=0; i<sub->order; i++) {
- put_sbits(&ctx->pb, cbits, sub->coefs[i]);
- }
-
- /* residual */
- output_residual(ctx, ch);
-}
-
-static void output_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_CONSTANT) {
- output_subframe_constant(s, ch);
- } else if(sub->type == FLAC_SUBFRAME_VERBATIM) {
- output_subframe_verbatim(s, ch);
- } else if(sub->type == FLAC_SUBFRAME_FIXED) {
- output_subframe_fixed(s, ch);
- } else if(sub->type == FLAC_SUBFRAME_LPC) {
- output_subframe_lpc(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 {
+ /* 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_v(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);
+ }
av_freep(&avctx->extradata);
avctx->extradata_size = 0;
av_freep(&avctx->coded_frame);
return 0;
}
+
AVCodec 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 SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
+ .long_name = NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"),
};