xenia-project/FFmpeg
1
0
Fork 0
mirror of https://github.com/xenia-project/FFmpeg.git synced 2024-11-24 03:59:43 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

more decorrelation types

Browse Source 
Originally committed as revision 3433 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Alex Beregszaszi 2004-09-04 11:19:37 +00:00
parent 952b32c0ad
commit cc078b9e09
1 changed files with 48 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

78
libavcodec/sonic.c
View File

@ -36,8 +36,12 @@
#define MAX_CHANNELS 2
#define MID_SIDE 0
#define LEFT_SIDE 1
#define RIGHT_SIDE 2
typedef struct SonicContext {
int lossless, mid_side;
int lossless, decorrelation;
int num_taps, downsampling;
double quantization;
@ -507,7 +511,7 @@ static int sonic_encode_init(AVCodecContext *avctx)
}
if (avctx->channels == 2)
s->mid_side = 1;
s->decorrelation = MID_SIDE;
if (avctx->codec->id == CODEC_ID_SONIC_LS)
{
@ -579,7 +583,7 @@ static int sonic_encode_init(AVCodecContext *avctx)
put_bits(&pb, 1, s->lossless);
if (!s->lossless)
put_bits(&pb, 3, SAMPLE_SHIFT); // XXX FIXME: sample precision
put_bits(&pb, 1, s->mid_side);
put_bits(&pb, 2, s->decorrelation);
put_bits(&pb, 2, s->downsampling);
put_bits(&pb, 5, (s->num_taps >> 5)-1); // 32..1024
put_bits(&pb, 1, 0); // XXX FIXME: no custom tap quant table
@ -587,8 +591,8 @@ static int sonic_encode_init(AVCodecContext *avctx)
flush_put_bits(&pb);
avctx->extradata_size = put_bits_count(&pb)/8;
av_log(avctx, AV_LOG_INFO, "Sonic: ver: %d ls: %d ms: %d taps: %d block: %d frame: %d downsamp: %d\n",
version, s->lossless, s->mid_side, s->num_taps, s->block_align, s->frame_size, s->downsampling);
av_log(avctx, AV_LOG_INFO, "Sonic: ver: %d ls: %d dr: %d taps: %d block: %d frame: %d downsamp: %d\n",
version, s->lossless, s->decorrelation, s->num_taps, s->block_align, s->frame_size, s->downsampling);
avctx->coded_frame = avcodec_alloc_frame();
if (!avctx->coded_frame)
@ -630,25 +634,30 @@ static int sonic_encode_frame(AVCodecContext *avctx,
// short -> internal
for (i = 0; i < s->frame_size; i++)
{
// if (samples[i] < 0)
// s->int_samples[i] = samples[i]+32768;
// else
// s->int_samples[i] = samples[i]-32768;
s->int_samples[i] = samples[i];
// av_log(NULL, AV_LOG_INFO, "%d\n", s->int_samples[i]);
}
if (!s->lossless)
for (i = 0; i < s->frame_size; i++)
s->int_samples[i] = s->int_samples[i] << SAMPLE_SHIFT;
if (s->mid_side)
for (i = 0; i < s->frame_size; i += s->channels)
{
s->int_samples[i] += s->int_samples[i+1];
s->int_samples[i+1] -= shift(s->int_samples[i], 1);
}
switch(s->decorrelation)
{
case MID_SIDE:
for (i = 0; i < s->frame_size; i += s->channels)
{
s->int_samples[i] += s->int_samples[i+1];
s->int_samples[i+1] -= shift(s->int_samples[i], 1);
}
break;
case LEFT_SIDE:
for (i = 0; i < s->frame_size; i += s->channels)
s->int_samples[i+1] -= s->int_samples[i];
break;
case RIGHT_SIDE:
for (i = 0; i < s->frame_size; i += s->channels)
s->int_samples[i] -= s->int_samples[i+1];
break;
}
memset(s->window, 0, 4* s->window_size);
@ -777,7 +786,7 @@ static int sonic_decode_init(AVCodecContext *avctx)
s->lossless = get_bits1(&gb);
if (!s->lossless)
skip_bits(&gb, 3); // XXX FIXME
s->mid_side = get_bits1(&gb);
s->decorrelation = get_bits(&gb, 2);
s->downsampling = get_bits(&gb, 2);
s->num_taps = (get_bits(&gb, 5)+1)<<5;
@ -788,8 +797,8 @@ static int sonic_decode_init(AVCodecContext *avctx)
s->frame_size = s->channels*s->block_align*s->downsampling;
// avctx->frame_size = s->block_align;
av_log(avctx, AV_LOG_INFO, "Sonic: ver: %d ls: %d ms: %d taps: %d block: %d frame: %d downsamp: %d\n",
version, s->lossless, s->mid_side, s->num_taps, s->block_align, s->frame_size, s->downsampling);
av_log(avctx, AV_LOG_INFO, "Sonic: ver: %d ls: %d dr: %d taps: %d block: %d frame: %d downsamp: %d\n",
version, s->lossless, s->decorrelation, s->num_taps, s->block_align, s->frame_size, s->downsampling);
// generate taps
s->tap_quant = av_mallocz(4* s->num_taps);
@ -886,12 +895,24 @@ static int sonic_decode_frame(AVCodecContext *avctx,
s->predictor_state[ch][i] = s->int_samples[s->frame_size - s->channels + ch - i*s->channels];
}
if (s->mid_side)
for (i = 0; i < s->frame_size; i += s->channels)
{
s->int_samples[i+1] += shift(s->int_samples[i], 1);
s->int_samples[i] -= s->int_samples[i+1];
}
switch(s->decorrelation)
{
case MID_SIDE:
for (i = 0; i < s->frame_size; i += s->channels)
{
s->int_samples[i+1] += shift(s->int_samples[i], 1);
s->int_samples[i] -= s->int_samples[i+1];
}
break;
case LEFT_SIDE:
for (i = 0; i < s->frame_size; i += s->channels)
s->int_samples[i+1] += s->int_samples[i];
break;
case RIGHT_SIDE:
for (i = 0; i < s->frame_size; i += s->channels)
s->int_samples[i] += s->int_samples[i+1];
break;
}
if (!s->lossless)
for (i = 0; i < s->frame_size; i++)
@ -910,9 +931,6 @@ static int sonic_decode_frame(AVCodecContext *avctx,
align_get_bits(&gb);
// if (buf_size != (get_bits_count(&gb)+7)/8)
// av_log(NULL, AV_LOG_INFO, "buf_size (%d) and used bytes (%d) differs\n", buf_size, (get_bits_count(&gb)+7)/8);
*data_size = s->frame_size * 2;
return (get_bits_count(&gb)+7)/8;