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Allow filters to set the requirements on permissions for incoming buffers. 

Commited in SoC by Bobby Bingham on 2007-08-17 16:40:26

Originally committed as revision 12008 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Vitor Sessak 2008-02-15 21:37:57 +00:00
parent 6fb0648d37
commit c949d86763
1 changed files with 55 additions and 3 deletions
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58
libavfilter/avfilter.c
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@ -82,13 +82,12 @@ int avfilter_link(AVFilterContext *src, unsigned srcpad,
return -1;
src->outputs[srcpad] =
dst->inputs[dstpad] = link = av_malloc(sizeof(AVFilterLink));
dst->inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
link->src = src;
link->dst = dst;
link->srcpad = srcpad;
link->dstpad = dstpad;
link->cur_pic = NULL;
link->format = -1;
return 0;
@ -167,13 +166,34 @@ void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
if(!start_frame)
start_frame = avfilter_default_start_frame;
start_frame(link, picref);
/* prepare to copy the picture if it has insufficient permissions */
if((link_dpad(link).min_perms & picref->perms) != link_dpad(link).min_perms ||
link_dpad(link).rej_perms & picref->perms) {
av_log(link->dst, AV_LOG_INFO,
"frame copy needed (have perms %x, need %x, reject %x)\n",
picref->perms,
link_dpad(link).min_perms, link_dpad(link).rej_perms);
link->cur_pic = avfilter_default_get_video_buffer(link, link_dpad(link).min_perms);
link->srcpic = picref;
}
else
link->cur_pic = picref;
start_frame(link, link->cur_pic);
}
void avfilter_end_frame(AVFilterLink *link)
{
void (*end_frame)(AVFilterLink *);
/* unreference the source picture if we're feeding the destination filter
* a copied version dues to permission issues */
if(link->srcpic) {
avfilter_unref_pic(link->srcpic);
link->srcpic = NULL;
}
end_frame = link_dpad(link).end_frame;
if(!end_frame)
end_frame = avfilter_default_end_frame;
@ -183,6 +203,38 @@ void avfilter_end_frame(AVFilterLink *link)
void avfilter_draw_slice(AVFilterLink *link, int y, int h)
{
uint8_t *src[4], *dst[4];
int i, j, hsub, vsub;
/* copy the slice if needed for permission reasons */
if(link->srcpic) {
avcodec_get_chroma_sub_sample(link->format, &hsub, &vsub);
src[0] = link->srcpic-> data[0] + y * link->srcpic-> linesize[0];
dst[0] = link->cur_pic->data[0] + y * link->cur_pic->linesize[0];
for(i = 1; i < 4; i ++) {
if(link->srcpic->data[i]) {
src[i] = link->srcpic-> data[i] + (y >> vsub) * link->srcpic-> linesize[i];
dst[i] = link->cur_pic->data[i] + (y >> vsub) * link->cur_pic->linesize[i];
} else
src[i] = dst[i] = NULL;
}
for(j = 0; j < h; j ++) {
memcpy(dst[0], src[0], link->cur_pic->linesize[0]);
src[0] += link->srcpic ->linesize[0];
dst[0] += link->cur_pic->linesize[0];
}
for(i = 1; i < 4; i ++) {
if(!src[i]) continue;
for(j = 0; j < h >> vsub; j ++) {
memcpy(dst[i], src[i], link->cur_pic->linesize[i]);
src[i] += link->srcpic ->linesize[i];
dst[i] += link->cur_pic->linesize[i];
}
}
}
if(!link_dpad(link).draw_slice)
return;