void ReplayAudioIngest::emit_frame(channel_entry &ch) {
BlockSet bset;
size_t i;
if (ch.fifo->fill_samples( ) < fft_size) {
throw std::runtime_error("cannot emit frame, not enough samples");
}
/* take FFT of ch.fifo->data( ) into ch.current_frame */
fft->compute(ch.current_frame, ch.fifo->data( ));
/* subtract phase of last_frame from phase of current_frame to get output_frame */
for (i = 0; i < fft_size; i++) {
output_frame[i] = std::polar(
std::abs(ch.current_frame[i]),
std::arg(ch.current_frame[i]) - std::arg(ch.last_frame[i])
);
}
/*
* swap last_frame and current_frame pointers
* (this makes current_frame the next last_frame)
*/
std::swap(ch.last_frame, ch.current_frame);
/* write output_frame to buffer */
bset.add_block(REPLAY_PVOC_BLOCK, output_frame, fft_size);
bset.add_block("Debug001", ch.fifo->data( ), fft_size);
ch.buffer->write_blockset(bset);
ch.fifo->pop_samples(fft_hop);
}
timecode_t ReplayBuffer::write_frame(const ReplayFrameData &data) {
BlockSet blkset;
if (data.video_size == 0) {
throw std::runtime_error("Tried to write empty frame");
}
if (data.video_size > 0) {
blkset.add_block(
REPLAY_VIDEO_BLOCK,
data.video_data,
data.video_size
);
}
if (data.thumbnail_size > 0) {
blkset.add_block(
REPLAY_THUMBNAIL_BLOCK,
data.thumbnail_data,
data.thumbnail_size
);
}
if (data.audio != NULL) {
blkset.add_object(REPLAY_AUDIO_BLOCK, *(data.audio));
}
return write_blockset(blkset);
}