lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[ALSA] Remove PCM sleep_min and tick

Browse Source 
The 'tick' in PCM is set (again) via sw_params.  And, nobody uses
this feature at all except for a command line option of aplay.
(This is literally 'nobody', as I checked alsa-lib API calls in all
 programs in major distros.)
Above all, if we need finer wake-ups for the position update, it's
basically an issue that the driver should solve, not tuned by each
application.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Takashi Iwai
2008-01-08 18:09:57 +01:00
committed by Jaroslav Kysela
parent 130755108b
commit 31e8960b35
5 changed files with 3 additions and 159 deletions
Download Patch File Download Diff File Expand all files Collapse all files

113
sound/core/pcm_lib.c
View File

@@ -1451,112 +1451,13 @@ int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
EXPORT_SYMBOL(snd_pcm_lib_ioctl);
/*
* Conditions
*/
static void snd_pcm_system_tick_set(struct snd_pcm_substream *substream,
unsigned long ticks)
{
struct snd_pcm_runtime *runtime = substream->runtime;
if (ticks == 0)
del_timer(&runtime->tick_timer);
else {
ticks += (1000000 / HZ) - 1;
ticks /= (1000000 / HZ);
mod_timer(&runtime->tick_timer, jiffies + ticks);
}
}
/* Temporary alias */
void snd_pcm_tick_set(struct snd_pcm_substream *substream, unsigned long ticks)
{
snd_pcm_system_tick_set(substream, ticks);
}
void snd_pcm_tick_prepare(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
snd_pcm_uframes_t frames = ULONG_MAX;
snd_pcm_uframes_t avail, dist;
unsigned int ticks;
u_int64_t n;
u_int32_t r;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
if (runtime->silence_size >= runtime->boundary) {
frames = 1;
} else if (runtime->silence_size > 0 &&
runtime->silence_filled < runtime->buffer_size) {
snd_pcm_sframes_t noise_dist;
noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
if (noise_dist > (snd_pcm_sframes_t)runtime->silence_threshold)
frames = noise_dist - runtime->silence_threshold;
}
avail = snd_pcm_playback_avail(runtime);
} else {
avail = snd_pcm_capture_avail(runtime);
}
if (avail < runtime->control->avail_min) {
snd_pcm_sframes_t to_avail_min =
runtime->control->avail_min - avail;
if (to_avail_min > 0 &&
frames > (snd_pcm_uframes_t)to_avail_min)
frames = to_avail_min;
}
if (avail < runtime->buffer_size) {
snd_pcm_sframes_t to_buffer_size =
runtime->buffer_size - avail;
if (to_buffer_size > 0 &&
frames > (snd_pcm_uframes_t)to_buffer_size)
frames = to_buffer_size;
}
if (frames == ULONG_MAX) {
snd_pcm_tick_set(substream, 0);
return;
}
dist = runtime->status->hw_ptr - runtime->hw_ptr_base;
/* Distance to next interrupt */
dist = runtime->period_size - dist % runtime->period_size;
if (dist <= frames) {
snd_pcm_tick_set(substream, 0);
return;
}
/* the base time is us */
n = frames;
n *= 1000000;
div64_32(&n, runtime->tick_time * runtime->rate, &r);
ticks = n + (r > 0 ? 1 : 0);
if (ticks < runtime->sleep_min)
ticks = runtime->sleep_min;
snd_pcm_tick_set(substream, (unsigned long) ticks);
}
void snd_pcm_tick_elapsed(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime;
unsigned long flags;
snd_assert(substream != NULL, return);
runtime = substream->runtime;
snd_assert(runtime != NULL, return);
snd_pcm_stream_lock_irqsave(substream, flags);
if (!snd_pcm_running(substream) ||
snd_pcm_update_hw_ptr(substream) < 0)
goto _end;
if (runtime->sleep_min)
snd_pcm_tick_prepare(substream);
_end:
snd_pcm_stream_unlock_irqrestore(substream, flags);
}
/**
* snd_pcm_period_elapsed - update the pcm status for the next period
* @substream: the pcm substream instance
*
* This function is called from the interrupt handler when the
* PCM has processed the period size. It will update the current
* pointer, set up the tick, wake up sleepers, etc.
* pointer, wake up sleepers, etc.
*
* Even if more than one periods have elapsed since the last call, you
* have to call this only once.
@@ -1580,8 +1481,6 @@ void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
if (substream->timer_running)
snd_timer_interrupt(substream->timer, 1);
if (runtime->sleep_min)
snd_pcm_tick_prepare(substream);
_end:
snd_pcm_stream_unlock_irqrestore(substream, flags);
if (runtime->transfer_ack_end)
@@ -1715,7 +1614,7 @@ static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
snd_pcm_uframes_t avail;
snd_pcm_uframes_t cont;
if (runtime->sleep_min == 0 && runtime->status->state == SNDRV_PCM_STATE_RUNNING)
if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
snd_pcm_update_hw_ptr(substream);
avail = snd_pcm_playback_avail(runtime);
if (!avail) {
@@ -1764,9 +1663,6 @@ static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
if (err < 0)
goto _end_unlock;
}
if (runtime->sleep_min &&
runtime->status->state == SNDRV_PCM_STATE_RUNNING)
snd_pcm_tick_prepare(substream);
}
_end_unlock:
snd_pcm_stream_unlock_irq(substream);
@@ -1923,7 +1819,7 @@ static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
snd_pcm_uframes_t avail;
snd_pcm_uframes_t cont;
if (runtime->sleep_min == 0 && runtime->status->state == SNDRV_PCM_STATE_RUNNING)
if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
snd_pcm_update_hw_ptr(substream);
avail = snd_pcm_capture_avail(runtime);
if (!avail) {
@@ -1973,9 +1869,6 @@ static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
offset += frames;
size -= frames;
xfer += frames;
if (runtime->sleep_min &&
runtime->status->state == SNDRV_PCM_STATE_RUNNING)
snd_pcm_tick_prepare(substream);
}
_end_unlock:
snd_pcm_stream_unlock_irq(substream);