static bool copy_data()

in most_snd.c [179:213]

• 30 lines of code
• 5 McCabe index (conditional complexity)

static bool copy_data(struct channel *channel, struct mbo *mbo)
{
	struct snd_pcm_runtime *const runtime = channel->substream->runtime;
	unsigned int const frame_bytes = channel->cfg->subbuffer_size;
	unsigned int const buffer_size = runtime->buffer_size;
	unsigned int frames;
	unsigned int fr0;

	if (channel->cfg->direction & MOST_CH_RX)
		frames = mbo->processed_length / frame_bytes;
	else
		frames = mbo->buffer_length / frame_bytes;
	fr0 = min(buffer_size - channel->buffer_pos, frames);

	channel->copy_fn(runtime->dma_area + channel->buffer_pos * frame_bytes,
			 mbo->virt_address,
			 fr0 * frame_bytes);

	if (frames > fr0) {
		/* wrap around at end of ring buffer */
		channel->copy_fn(runtime->dma_area,
				 mbo->virt_address + fr0 * frame_bytes,
				 (frames - fr0) * frame_bytes);
	}

	channel->buffer_pos += frames;
	if (channel->buffer_pos >= buffer_size)
		channel->buffer_pos -= buffer_size;
	channel->period_pos += frames;
	if (channel->period_pos >= runtime->period_size) {
		channel->period_pos -= runtime->period_size;
		return true;
	}
	return false;
}