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ALSA: snd-aloop - add pause support 

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2010-10-20 09:33:03 +02:00
parent dd04bb12d0
commit 5de9e45fcf
1 changed files with 22 additions and 5 deletions
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27
sound/drivers/aloop.c
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@ -77,6 +77,7 @@ struct loopback_cable {
/* flags */
unsigned int valid;
unsigned int running;
unsigned int pause;
};
struct loopback_setup {
@ -254,7 +255,7 @@ static int loopback_trigger(struct snd_pcm_substream *substream, int cmd)
struct snd_pcm_runtime *runtime = substream->runtime;
struct loopback_pcm *dpcm = runtime->private_data;
struct loopback_cable *cable = dpcm->cable;
int err;
int err, stream = 1 << substream->stream;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
@ -264,7 +265,8 @@ static int loopback_trigger(struct snd_pcm_substream *substream, int cmd)
dpcm->last_jiffies = jiffies;
dpcm->pcm_rate_shift = 0;
spin_lock(&cable->lock);
cable->running |= (1 << substream->stream);
cable->running |= stream;
cable->pause &= ~stream;
spin_unlock(&cable->lock);
loopback_timer_start(dpcm);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
@ -272,12 +274,26 @@ static int loopback_trigger(struct snd_pcm_substream *substream, int cmd)
break;
case SNDRV_PCM_TRIGGER_STOP:
spin_lock(&cable->lock);
cable->running &= ~(1 << substream->stream);
cable->running &= ~stream;
cable->pause &= ~stream;
spin_unlock(&cable->lock);
loopback_timer_stop(dpcm);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
loopback_active_notify(dpcm);
break;
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
spin_lock(&cable->lock);
cable->pause |= stream;
spin_unlock(&cable->lock);
loopback_timer_stop(dpcm);
break;
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
spin_lock(&cable->lock);
dpcm->last_jiffies = jiffies;
cable->pause &= ~stream;
spin_unlock(&cable->lock);
loopback_timer_start(dpcm);
break;
default:
return -EINVAL;
}
@ -468,7 +484,7 @@ static unsigned int loopback_pos_update(struct loopback_cable *cable)
unsigned int running;
spin_lock(&cable->lock);
running = cable->running;
running = cable->running ^ cable->pause;
if (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) {
delta_play = jiffies - dpcm_play->last_jiffies;
dpcm_play->last_jiffies += delta_play;
@ -532,7 +548,7 @@ static snd_pcm_uframes_t loopback_pointer(struct snd_pcm_substream *substream)
static struct snd_pcm_hardware loopback_pcm_hardware =
{
.info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID),
SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_PAUSE),
.formats = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |
SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE |
SNDRV_PCM_FMTBIT_FLOAT_LE | SNDRV_PCM_FMTBIT_FLOAT_BE),
@ -1060,6 +1076,7 @@ static void print_substream_info(struct snd_info_buffer *buffer,
}
snd_iprintf(buffer, " valid: %u\n", cable->valid);
snd_iprintf(buffer, " running: %u\n", cable->running);
snd_iprintf(buffer, " pause: %u\n", cable->pause);
print_dpcm_info(buffer, cable->streams[0], "Playback");
print_dpcm_info(buffer, cable->streams[1], "Capture");
}