ffmpeg upgrading
Tuesday, March 18th, 2008Ffmpeg is the most changing-est library I know.
The “img_convert” method is on the way out. The replacement is to use the swscale library. Here’s a rough conversion between the two:
int stable_img_convert (AVPicture *dst, int dst_pix_fmt,
const AVPicture *src, int src_pix_fmt,
int src_width, int src_height) {
#ifdef OLD_FFMPEG
return img_convert(dst,dst_pix_fmt,src,src_pix_fmt,src_width,src_height);
#else
int w = src_width;
int h = src_height;
static struct SwsContext *img_convert_ctx = NULL;
if (img_convert_ctx==NULL) {
img_convert_ctx = sws_getContext(src_width, src_height,
dst_pix_fmt,
src_width, src_height,
src_pix_fmt,
0, NULL, NULL, NULL);
}
if (img_convert_ctx!=NULL) {
sws_scale(img_convert_ctx, ((AVPicture*)src)->data,
((AVPicture*)src)->linesize, 0, src_height,
((AVPicture*)dst)->data, ((AVPicture*)dst)->linesize);
} else {
fprintf(stderr,“image conversion failed\n“);
return -1;
}
return 0;
#endif
}
const AVPicture *src, int src_pix_fmt,
int src_width, int src_height) {
#ifdef OLD_FFMPEG
return img_convert(dst,dst_pix_fmt,src,src_pix_fmt,src_width,src_height);
#else
int w = src_width;
int h = src_height;
static struct SwsContext *img_convert_ctx = NULL;
if (img_convert_ctx==NULL) {
img_convert_ctx = sws_getContext(src_width, src_height,
dst_pix_fmt,
src_width, src_height,
src_pix_fmt,
0, NULL, NULL, NULL);
}
if (img_convert_ctx!=NULL) {
sws_scale(img_convert_ctx, ((AVPicture*)src)->data,
((AVPicture*)src)->linesize, 0, src_height,
((AVPicture*)dst)->data, ((AVPicture*)dst)->linesize);
} else {
fprintf(stderr,“image conversion failed\n“);
return -1;
}
return 0;
#endif
}
To convert for real, you’ll need to factor out the static “SwsContext” object that gets created in the middle of the code; as it is you’d have big trouble if you are processing multiple streams or changing sources as you go along.