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optimization: merge phases 0 and 1

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Originally committed as revision 1970 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Nick Kurshev 2003-06-18 06:37:23 +00:00
parent cb90660957
commit cebe4432e9
1 changed files with 9 additions and 15 deletions
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24
libavcodec/ra288.c
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@ -386,14 +386,13 @@ static void prodsum(float *tgt, float *src, int len, int n)
}
}
void * decode_block(AVCodecContext * avctx, unsigned char *in, signed short int *out)
void * decode_block(AVCodecContext * avctx, unsigned char *in, signed short int *out,unsigned len)
{
int x,y;
Real288_internal *glob=avctx->priv_data;
int cfs=((short*)(avctx->extradata))[3]; /* coded frame size 38 */
unsigned short int buffer[cfs];
unsigned short int buffer[len];
unpack(buffer,in,cfs);
unpack(buffer,in,len);
for (x=0;x<32;x++)
{
glob->phasep=(glob->phase=x&7)*5;
@ -417,30 +416,25 @@ static int ra288_decode_frame(AVCodecContext * avctx,
//((short*)(avctx->extradata))[3]; /* coded frame size */
//((short*)(avctx->extradata))[4]; /* codec's data length */
//((short*)(avctx->extradata))[5...] /* codec's data */
int z,bret;
int bret;
void *datao;
int w=avctx->block_align; /* 228 */
int h=((short*)(avctx->extradata))[1]; /* 12 */
int cfs=((short*)(avctx->extradata))[3]; /* coded frame size 38 */
int i,j;
unsigned char tb[h*w], *ptb;
if(buf_size<w*h)
{
fprintf(stderr,"ffra288: Error! Input buffer is too small [%d<%d]\n",buf_size,w*h);
return 0;
}
datao = data;
ptb = buf;
/* Phase 0: deinterleave */
for (j = 0; j < h; j++)
for (i = 0; i < h/2; i++)
bret = 0;
for (j = 0; j < h/2; j++)
for (i = 0; i < h; i++)
{
memcpy(&tb[i*2*w+j*cfs],ptb,cfs);
ptb += cfs;
data=decode_block(avctx,&buf[j*cfs+cfs*i*h/2],(signed short *)data,cfs);
bret += cfs;
}
/* Phase 1: decode */
bret = ptb-buf;
for(z=0;z<bret;z+=cfs) data=decode_block(avctx,&tb[z],(signed short *)data);
*data_size = data - datao;
return bret;
}