virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-11-21 10:55:51 +02:00
Code Issues Releases Activity

remove residual array, it isnt really needed

Browse Source 
Originally committed as revision 2792 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2004-02-18 02:00:55 +00:00
parent ac2570a8b0
commit 4fd125984b
1 changed files with 13 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
libavcodec/flac.c
View File

@ -52,7 +52,6 @@ typedef struct FLACContext {
int bps, curr_bps;
enum channel_order order;
int32_t *residual[MAX_CHANNELS];
int32_t *decoded[MAX_CHANNELS];
uint8_t *bitstream;
int bitstream_size;
@ -120,7 +119,6 @@ static void allocate_buffers(FLACContext *s){
for (i = 0; i < s->channels; i++)
{
s->decoded[i] = av_realloc(s->decoded[i], sizeof(int32_t)*s->max_blocksize);
s->residual[i] = av_realloc(s->residual[i], sizeof(int32_t)*s->max_blocksize);
}
s->bitstream= av_fast_realloc(s->bitstream, &s->allocated_bitstream_size, s->max_framesize);
@ -176,13 +174,13 @@ static int decode_residuals(FLACContext *s, int channel, int pred_order)
av_log(s->avctx, AV_LOG_DEBUG, "fixed len partition\n");
tmp = get_bits(&s->gb, 5);
for (; i < samples; i++, sample++)
s->residual[channel][sample] = get_sbits(&s->gb, tmp);
s->decoded[channel][sample] = get_sbits(&s->gb, tmp);
}
else
{
// av_log(s->avctx, AV_LOG_DEBUG, "rice coded partition k=%d\n", tmp);
for (; i < samples; i++, sample++){
s->residual[channel][sample] = get_sr_golomb_flac(&s->gb, tmp, INT_MAX, 0);
s->decoded[channel][sample] = get_sr_golomb_flac(&s->gb, tmp, INT_MAX, 0);
if(get_bits_count(&s->gb) > s->gb.size_in_bits){
av_log(s->avctx, AV_LOG_ERROR, "fucking FLAC\n");
return -1;
@ -218,34 +216,28 @@ static int decode_subframe_fixed(FLACContext *s, int channel, int pred_order)
switch(pred_order)
{
case 0:
for (i = pred_order; i < s->blocksize; i++)
s->decoded[channel][i] = s->residual[channel][i];
break;
case 1:
for (i = pred_order; i < s->blocksize; i++)
s->decoded[channel][i] = s->residual[channel][i] +
s->decoded[channel][i-1];
s->decoded[channel][i] += s->decoded[channel][i-1];
break;
case 2:
for (i = pred_order; i < s->blocksize; i++)
s->decoded[channel][i] = s->residual[channel][i] +
(s->decoded[channel][i-1] << 1) -
s->decoded[channel][i-2];
s->decoded[channel][i] += 2*s->decoded[channel][i-1]
- s->decoded[channel][i-2];
break;
case 3:
for (i = pred_order; i < s->blocksize; i++)
s->decoded[channel][i] = s->residual[channel][i] +
3*(s->decoded[channel][i-1] - s->decoded[channel][i-2])
+ s->decoded[channel][i-3];
s->decoded[channel][i] += 3*s->decoded[channel][i-1]
- 3*s->decoded[channel][i-2]
+ s->decoded[channel][i-3];
break;
case 4:
for (i = pred_order; i < s->blocksize; i++)
s->decoded[channel][i] = s->residual[channel][i] +
((s->decoded[channel][i-1] +
s->decoded[channel][i-3]) << 2) -
((s->decoded[channel][i-2] << 2) +
(s->decoded[channel][i-2] << 1)) -
s->decoded[channel][i-4];
s->decoded[channel][i] += 4*s->decoded[channel][i-1]
- 6*s->decoded[channel][i-2]
+ 4*s->decoded[channel][i-3]
- s->decoded[channel][i-4];
break;
default:
av_log(s->avctx, AV_LOG_ERROR, "illegal pred order %d\n", pred_order);
@ -296,7 +288,7 @@ assert(qlevel >= 0); //FIXME
sum = 0;
for (j = 0; j < pred_order; j++)
sum += coeffs[j] * s->decoded[channel][i-j-1];
s->decoded[channel][i] = s->residual[channel][i] + (sum >> qlevel);
s->decoded[channel][i] += sum >> qlevel;
}
return 0;
@ -502,7 +494,6 @@ static int decode_frame(FLACContext *s)
/* if (s->blocksize != s->last_blocksize)
{
s->decoded[i] = av_realloc(s->decoded[i], sizeof(uint32_t)*s->blocksize);
s->residual[i] = av_realloc(s->residual[i], sizeof(uint8_t)*s->blocksize);
}*/
// av_log(s->avctx, AV_LOG_DEBUG, "decoded: %x residual: %x\n", s->decoded[i], s->residual[i]);
if (decode_subframe(s, i) < 0)
@ -716,7 +707,6 @@ static int flac_decode_close(AVCodecContext *avctx)
for (i = 0; i < s->channels; i++)
{
av_freep(&s->decoded[i]);
av_freep(&s->residual[i]);
}
av_freep(&s->bitstream);