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Add/fix support for bitstream formats reading in read_line().

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Originally committed as revision 18291 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Stefano Sabatini 2009-03-31 22:52:30 +00:00
parent 21010f6b2a
commit c95dd8d382
1 changed files with 16 additions and 9 deletions
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25
libavcodec/pixdesc.h
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@ -22,6 +22,7 @@
#include <inttypes.h>
#include "libavutil/intreadwrite.h"
#include "libavcodec/bitstream.h"
typedef struct AVComponentDescriptor{
uint16_t plane :2; ///< which of the 4 planes contains the component
@ -103,9 +104,21 @@ static inline void read_line(uint16_t *dst, const uint8_t *data[4], const int li
int shift= comp.shift;
int step = comp.step_minus1+1;
int flags= desc->flags;
const uint8_t *p= data[plane]+y*linesize[plane] + x * step + comp.offset_plus1 - 1;
//FIXME initial x in case of PIX_FMT_BITSTREAM is wrong
if (flags & PIX_FMT_BITSTREAM){
GetBitContext gb;
init_get_bits(&gb, data[plane] + y*linesize[plane], linesize[plane]*8);
skip_bits_long(&gb, x*step + comp.offset_plus1-1);
while(w--){
int val = show_bits(&gb, depth);
if(flags & PIX_FMT_PAL)
val= data[1][4*val + c];
skip_bits(&gb, step);
*dst++= val;
}
} else {
const uint8_t *p = data[plane]+ y*linesize[plane] + x*step + comp.offset_plus1-1;
while(w--){
int val;
@ -114,14 +127,8 @@ static inline void read_line(uint16_t *dst, const uint8_t *data[4], const int li
val = (val>>shift) & mask;
if(flags & PIX_FMT_PAL)
val= data[1][4*val + c];
if(flags & PIX_FMT_BITSTREAM){
shift-=depth;
while(shift<0){
shift+=8;
p++;
}
}else
p+= step;
*dst++= val;
}
}
}