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PCM mixer: Simplify mixer_channel_play_data.

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Streamline it to do fewer PCM lock calls in the case of having a prepared
buffer.

Change-Id: I7fca2b95cc5da314ae257522bb6f1ad7aec6634a
This commit is contained in:
Michael Sevakis 2012-02-17 03:54:45 -05:00
parent 565a4b5baa
commit 39eec730b0
1 changed files with 16 additions and 27 deletions
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43
firmware/pcm_mixer.c
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@ -256,26 +256,31 @@ static void mixer_start_pcm(void)
pcm_play_data(mixer_pcm_callback, start, MIX_FRAME_SIZE);
}
/* Initialize the channel and start it if it has data */
static void mixer_channel_play_start(struct mixer_channel *chan,
pcm_play_callback_type get_more,
unsigned char *start, size_t size)
/** Public interfaces **/
/* Start playback on a channel */
void mixer_channel_play_data(enum pcm_mixer_channel channel,
pcm_play_callback_type get_more,
unsigned char *start, size_t size)
{
pcm_play_unlock(); /* Allow playback while doing any callback */
struct mixer_channel *chan = &channels[channel];
ALIGN_AUDIOBUF(start, size);
if (!(start && size))
if (!(start && size) && get_more)
{
/* Initial buffer not passed - call the callback now */
pcm_play_lock();
mixer_deactivate_channel(chan); /* Protect chan struct if active */
pcm_play_unlock(); /* Allow playback while doing callback */
size = 0;
if (get_more)
{
get_more(&start, &size);
ALIGN_AUDIOBUF(start, size);
}
get_more(&start, &size);
ALIGN_AUDIOBUF(start, size);
}
pcm_play_lock();
if (start && size)
{
/* We have data - start the channel */
@ -285,31 +290,15 @@ static void mixer_channel_play_start(struct mixer_channel *chan,
chan->last_size = 0;
chan->get_more = get_more;
pcm_play_lock();
mixer_activate_channel(chan);
mixer_start_pcm();
}
else
{
/* Never had anything - stop it now */
pcm_play_lock();
channel_stopped(chan);
}
}
/** Public interfaces **/
/* Start playback on a channel */
void mixer_channel_play_data(enum pcm_mixer_channel channel,
pcm_play_callback_type get_more,
unsigned char *start, size_t size)
{
struct mixer_channel *chan = &channels[channel];
pcm_play_lock();
mixer_deactivate_channel(chan);
mixer_channel_play_start(chan, get_more, start, size);
pcm_play_unlock();
}