static int pcm_prepare()

in most_snd.c [322:356]

• 32 lines of code
• 13 McCabe index (conditional complexity)

static int pcm_prepare(struct snd_pcm_substream *substream)
{
	struct channel *channel = substream->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct most_channel_config *cfg = channel->cfg;
	int width = snd_pcm_format_physical_width(runtime->format);

	channel->copy_fn = NULL;

	if (cfg->direction == MOST_CH_TX) {
		if (snd_pcm_format_big_endian(runtime->format) || width == 8)
			channel->copy_fn = alsa_to_most_memcpy;
		else if (width == 16)
			channel->copy_fn = alsa_to_most_copy16;
		else if (width == 24)
			channel->copy_fn = alsa_to_most_copy24;
		else if (width == 32)
			channel->copy_fn = alsa_to_most_copy32;
	} else {
		if (snd_pcm_format_big_endian(runtime->format) || width == 8)
			channel->copy_fn = most_to_alsa_memcpy;
		else if (width == 16)
			channel->copy_fn = most_to_alsa_copy16;
		else if (width == 24)
			channel->copy_fn = most_to_alsa_copy24;
		else if (width == 32)
			channel->copy_fn = most_to_alsa_copy32;
	}

	if (!channel->copy_fn)
		return -EINVAL;
	channel->period_pos = 0;
	channel->buffer_pos = 0;
	return 0;
}