RepoMirrors/ffmpeg
1
0
Fork 0
mirror of https://git.ffmpeg.org/ffmpeg.git synced 2024-12-27 01:42:20 +00:00
Code Issues Projects Releases Wiki Activity

Use sign_extend function instead of reimplementing it.

Browse Source 
Originally committed as revision 18599 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2009-04-17 20:05:27 +00:00
parent e62f622193
commit d7670f2827
1 changed files with 2 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
libavcodec/xan.c
View File

@ -333,16 +333,10 @@ static void xan_wc3_decode_frame(XanContext *s) {
}
} else {
/* run-based motion compensation from last frame */
motion_x = *vector_segment >> 4;
motion_y = *vector_segment & 0xF;
motion_x = sign_extend(*vector_segment >> 4, 4);
motion_y = sign_extend(*vector_segment & 0xF, 4);
vector_segment++;
/* sign extension */
if (motion_x & 0x8)
motion_x |= 0xFFFFFFF0;
if (motion_y & 0x8)
motion_y |= 0xFFFFFFF0;
/* copy a run of pixels from the previous frame */
xan_wc3_copy_pixel_run(s, x, y, size, motion_x, motion_y);