- if (link->time_base.num == 0 && link->time_base.den == 0)
- link->time_base = link->src && link->src->input_count ?
- link->src->inputs[0]->time_base : AV_TIME_BASE_Q;
-
- if (link->sample_aspect_ratio.num == 0 && link->sample_aspect_ratio.den == 0)
- link->sample_aspect_ratio = link->src->input_count ?
- link->src->inputs[0]->sample_aspect_ratio : (AVRational){1,1};
-
- if (link->sample_rate == 0 && link->src && link->src->input_count)
- link->sample_rate = link->src->inputs[0]->sample_rate;
-
- if (link->channel_layout == 0 && link->src && link->src->input_count)
- link->channel_layout = link->src->inputs[0]->channel_layout;
+ switch (link->type) {
+ case AVMEDIA_TYPE_VIDEO:
+ if (!link->time_base.num && !link->time_base.den)
+ link->time_base = inlink ? inlink->time_base : AV_TIME_BASE_Q;
+
+ if (!link->sample_aspect_ratio.num && !link->sample_aspect_ratio.den)
+ link->sample_aspect_ratio = inlink ?
+ inlink->sample_aspect_ratio : (AVRational){1,1};
+
+ if (inlink) {
+ if (!link->w)
+ link->w = inlink->w;
+ if (!link->h)
+ link->h = inlink->h;
+ } else if (!link->w || !link->h) {
+ av_log(link->src, AV_LOG_ERROR,
+ "Video source filters must set their output link's "
+ "width and height\n");
+ return AVERROR(EINVAL);
+ }
+ break;
+
+ case AVMEDIA_TYPE_AUDIO:
+ if (inlink) {
+ if (!link->sample_rate)
+ link->sample_rate = inlink->sample_rate;
+ if (!link->time_base.num && !link->time_base.den)
+ link->time_base = inlink->time_base;
+ } else if (!link->sample_rate) {
+ av_log(link->src, AV_LOG_ERROR,
+ "Audio source filters must set their output link's "
+ "sample_rate\n");
+ return AVERROR(EINVAL);
+ }
+
+ if (!link->time_base.num && !link->time_base.den)
+ link->time_base = (AVRational) {1, link->sample_rate};
+ }