diff options
Diffstat (limited to 'libavfilter/video.c')
-rw-r--r-- | libavfilter/video.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/libavfilter/video.c b/libavfilter/video.c index 92b16b2b53..566b0ecb72 100644 --- a/libavfilter/video.c +++ b/libavfilter/video.c @@ -157,6 +157,42 @@ int ff_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref) return ff_start_frame(link->dst->outputs[0], buf_out); } +// for filters that support (but don't require) outpic==inpic +int ff_inplace_start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref) +{ + AVFilterLink *outlink = inlink->dst->outputs[0]; + AVFilterBufferRef *outpicref = NULL, *for_next_filter; + int ret = 0; + + if ((inpicref->perms & AV_PERM_WRITE) && !(inpicref->perms & AV_PERM_PRESERVE)) { + outpicref = avfilter_ref_buffer(inpicref, ~0); + if (!outpicref) + return AVERROR(ENOMEM); + } else { + outpicref = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h); + if (!outpicref) + return AVERROR(ENOMEM); + + avfilter_copy_buffer_ref_props(outpicref, inpicref); + outpicref->video->w = outlink->w; + outpicref->video->h = outlink->h; + } + + for_next_filter = avfilter_ref_buffer(outpicref, ~0); + if (for_next_filter) + ret = ff_start_frame(outlink, for_next_filter); + else + ret = AVERROR(ENOMEM); + + if (ret < 0) { + avfilter_unref_bufferp(&outpicref); + return ret; + } + + outlink->out_buf = outpicref; + return 0; +} + static int default_start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref) { AVFilterLink *outlink = NULL; |