here it checks against sources with the indexes into av_streams (filtered and maybe sorted, so not the same as ffmpeg's stream indexes):
|
while (true) { |
|
if (index == av_streams.size()) { |
|
graph = nullptr; |
|
return; |
|
} |
|
if (av_streams.at(index)->codecpar->codec_type == type && |
|
sources.find(static_cast<int>(index)) == sources.end()) { |
|
break; |
|
} |
|
index++; |
|
} |
|
|
|
index = av_streams.at(index)->index; |
later it inserts into sources with the actual ffmpeg stream indexes:
|
sources.emplace(index, source); |
|
sources.emplace(index, source); |
also, sorting streams by height and then alphamerge-ing them if there's more than 1 seems incredibly sketchy:
|
if (video_input_count == 1) { |
|
std::stable_sort(av_streams.begin(), av_streams.end(), [](auto lhs, auto rhs) { |
|
return lhs->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && lhs->codecpar->height > rhs->codecpar->height; |
|
}); |
|
|
|
std::vector<AVStream*> video_av_streams; |
|
std::copy_if(av_streams.begin(), av_streams.end(), std::back_inserter(video_av_streams), [](auto s) { |
|
return s->codecpar->codec_type == AVMEDIA_TYPE_VIDEO; |
|
}); |
|
|
|
// TODO (fix) Use some form of stream meta data to do this. |
|
// https://github.com/CasparCG/server/issues/832 |
|
if (video_av_streams.size() >= 2 && |
|
video_av_streams[0]->codecpar->height == video_av_streams[1]->codecpar->height) { |
|
filter_spec = "alphamerge," + filter_spec; |
|
} |
|
} |
