const boost::iterator_range<const uint8_t*> image_data()
{
{
tbb::mutex::scoped_lock lock(mutex_);
if(!image_data_->data())
{
image_data_.get()->wait(*ogl_);
ogl_->invoke([=]{image_data_.get()->map();}, high_priority);
}
}
auto ptr = static_cast<const uint8_t*>(image_data_->data());
return boost::iterator_range<const uint8_t*>(ptr, ptr + image_data_->size());
}
std::shared_ptr<AVFrame> poll()
{
if(packets_.empty())
return nullptr;
auto packet = packets_.front();
if(packet->data == nullptr)
{
if(codec_context_->codec->capabilities & CODEC_CAP_DELAY)
{
auto video = decode(packet);
if(video)
return video;
}
packets_.pop();
file_frame_number_ = static_cast<size_t>(packet->pos);
avcodec_flush_buffers(codec_context_.get());
return flush_video();
}
packets_.pop();
return decode(packet);
}
std::shared_ptr<AVFrame> decode(safe_ptr<AVPacket> pkt)
{
std::shared_ptr<AVFrame> decoded_frame(avcodec_alloc_frame(), av_free);
int frame_finished = 0;
THROW_ON_ERROR2(avcodec_decode_video2(codec_context_.get(), decoded_frame.get(), &frame_finished, pkt.get()), "[video_decoder]");
// If a decoder consumes less then the whole packet then something is wrong
// that might be just harmless padding at the end, or a problem with the
// AVParser or demuxer which puted more then one frame in a AVPacket.
if(frame_finished == 0)
return nullptr;
is_progressive_ = !decoded_frame->interlaced_frame;
if(decoded_frame->repeat_pict > 0)
CASPAR_LOG(warning) << "[video_decoder] Field repeat_pict not implemented.";
++file_frame_number_;
// This ties the life of the decoded_frame to the packet that it came from. For the
// current version of ffmpeg (0.8 or c17808c) the RAW_VIDEO codec returns frame data
// owned by the packet.
return std::shared_ptr<AVFrame>(decoded_frame.get(), [decoded_frame, pkt](AVFrame*){});
}
