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Simplify avcodec_default_get_buffer() 

Originally committed as revision 11962 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Vitor Sessak 2008-02-15 20:23:49 +00:00
parent 4fe109ebdd
commit db7ae7d1b9
1 changed files with 19 additions and 17 deletions
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36
libavcodec/utils.c
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@ -31,6 +31,7 @@
#include "integer.h"
#include "opt.h"
#include "crc.h"
#include "imgconvert.h"
#include <stdarg.h>
#include <limits.h>
#include <float.h>
@ -271,7 +272,8 @@ int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
buf->last_pic_num= *picture_number;
}else{
int h_chroma_shift, v_chroma_shift;
int pixel_size, size[4];
int size[4] = {0};
int tmpsize;
AVPicture picture;
avcodec_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);
@ -284,23 +286,23 @@ int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
}
avcodec_align_dimensions(s, &w, &h);
avpicture_fill(&picture, NULL, s->pix_fmt, w, h);
pixel_size= picture.linesize[0]*8 / w;
//av_log(NULL, AV_LOG_ERROR, "%d %d %d %d\n", (int)picture.data[1], w, h, s->pix_fmt);
assert(pixel_size>=1);
//FIXME next ensures that linesize= 2^x uvlinesize, that is needed because some MC code assumes it
if(pixel_size == 3*8)
w= ALIGN(w, STRIDE_ALIGN<<h_chroma_shift);
ff_fill_linesize(&picture, s->pix_fmt, w);
for (i=1; i<4; i++)
picture.linesize[i] = ALIGN(picture.linesize[i], STRIDE_ALIGN);
/* next ensures that linesize= 2^x uvlinesize, that is needed because
* some MC code assumes it */
if (picture.linesize[1])
picture.linesize[0] = ALIGN(picture.linesize[0], picture.linesize[1]);
else
w= ALIGN(pixel_size*w, STRIDE_ALIGN<<(h_chroma_shift+3)) / pixel_size;
size[1] = avpicture_fill(&picture, NULL, s->pix_fmt, w, h);
size[0] = picture.linesize[0] * h;
size[1] -= size[0];
size[2] = size[3] = 0;
if(picture.data[2])
size[1]= size[2]= size[1]/2;
if(picture.data[3])
size[3] = picture.linesize[3] * h;
picture.linesize[0] = ALIGN(picture.linesize[0], STRIDE_ALIGN);
tmpsize = ff_fill_pointer(&picture, NULL, s->pix_fmt, h);
for (i=0; i<3 && picture.data[i+1]; i++)
size[i] = picture.data[i+1] - picture.data[i];
size[i] = tmpsize - size[i];
buf->last_pic_num= -256*256*256*64;
memset(buf->base, 0, sizeof(buf->base));