Method GetOrCreateFrame

src/FrameMapper.cpp:393–431

Get or generate a blank frame

// Get or generate a blank frame
std::shared_ptr<Frame> FrameMapper::GetOrCreateFrame(int64_t number)
{
	std::shared_ptr<Frame> new_frame;

	// Init some basic properties about this frame (keep sample rate and # channels the same as the original reader for now)
	int samples_in_frame = Frame::GetSamplesPerFrame(AdjustFrameNumber(number), target, reader->info.sample_rate, reader->info.channels);

	try {
		// Debug output
		ZmqLogger::Instance()->AppendDebugMethod(
			"FrameMapper::GetOrCreateFrame (from reader)",
			"number", number,
			"samples_in_frame", samples_in_frame);

		// Attempt to get a frame (but this could fail if a reader has just been closed)
		new_frame = reader->GetFrame(number);

		// Return real frame
		return new_frame;

	} catch (const ReaderClosed & e) {
		// ...
	} catch (const OutOfBoundsFrame & e) {
		// ...
	}

	// Debug output
	ZmqLogger::Instance()->AppendDebugMethod(
		"FrameMapper::GetOrCreateFrame (create blank)",
		"number", number,
		"samples_in_frame", samples_in_frame);

	// Create blank frame
	new_frame = std::make_shared<Frame>(number, info.width, info.height, "#000000", samples_in_frame, reader->info.channels);
	new_frame->SampleRate(reader->info.sample_rate);
	new_frame->ChannelsLayout(info.channel_layout);
	new_frame->AddAudioSilence(samples_in_frame);
	return new_frame;
}

// Get an openshot::Frame object for a specific frame number of this reader.
std::shared_ptr<Frame> FrameMapper::GetFrame(int64_t requested_frame)