RepoMirrors
/
ffmpeg
mirror of https://git.ffmpeg.org/ffmpeg.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Rewrite unpack() using the bitstream reader 

Originally committed as revision 14038 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Vitor Sessak 2008-06-30 18:36:45 +00:00
parent e500315b1d
commit a40b2c2a4b
1 changed files with 9 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
libavcodec/ra288.c
View File

@ -20,6 +20,8 @@
*/
#include "avcodec.h"
#define ALT_BITSTREAM_READER_LE
#include "bitstream.h"
#include "ra288.h"
typedef struct {
@ -39,28 +41,15 @@ typedef struct {
static void unpack(unsigned short *tgt, const unsigned char *src,
unsigned int len)
{
int x, y, z;
int n, temp;
int buffer[len];
int i = 0;
GetBitContext gb;
for (x=0; x < len; tgt[x++] = 0)
buffer[x] = 9 + (x & 1);
init_get_bits(&gb, src, len * 8);
for (x=y=z=0; x < len/*was 38*/; x++) {
n = buffer[y] - z;
temp = src[x];
if (n < 8)
temp &= 255 >> (8 - n);
tgt[y] += temp << z;
if (n <= 8) {
tgt[++y] += src[x] >> n;
z = 8 - n;
} else
z += 8;
}
while (get_bits_count(&gb) + 9 + (i&1) <= len*8) {
tgt[i] = get_bits(&gb, 9 + (i&1));
i++;
}
}
/* Decode and produce output */