Method fillData

framework/video/smk.cpp:360–411

const UString &SMKMusicTrack::getName() const { return this->video->file_path; }

MusicTrack::MusicCallbackReturn SMKMusicTrack::fillData(unsigned int maxSamples, void *sampleBuffer,
                                                        unsigned int *returnedSamples)
{
	*returnedSamples = 0;

	if (!this->current_frame)
	{
		LogWarning("Playing beyond end of video");
		return MusicCallbackReturn::End;
	}

	unsigned int output_offset_bytes = 0;
	while (*returnedSamples < maxSamples && this->current_frame)
	{
		unsigned int samples_in_this_frame =
		    std::min(maxSamples - *returnedSamples,
		             this->current_frame->sample_count - this->current_frame_sample_position);

		unsigned int audio_size_bytes = samples_in_this_frame *
		                                this->current_frame->format.getSampleSize() *
		                                this->current_frame->format.channels;

		unsigned int audio_offset_bytes = this->current_frame_sample_position *
		                                  this->current_frame->format.getSampleSize() *
		                                  this->current_frame->format.channels;

		memcpy((uint8_t *)sampleBuffer + output_offset_bytes,
		       this->current_frame->samples.get() + audio_offset_bytes, audio_size_bytes);

		output_offset_bytes += audio_size_bytes;

		*returnedSamples += samples_in_this_frame;

		this->current_frame_sample_position += samples_in_this_frame;
		LogAssert(this->current_frame_sample_position <= this->current_frame->sample_count);

		if (this->current_frame_sample_position == this->current_frame->sample_count)
		{
			this->current_frame = video->popAudio();
			this->current_frame_sample_position = 0;
		}
	}

	if (this->current_frame)
	{
		return MusicCallbackReturn::Continue;
	}
	else
	{
		return MusicCallbackReturn::End;
	}
}
sp<Video> loadSMKVideo(IFile &file)
{
	auto vid = mksp<SMKVideo>();