* [Qemu-devel] [PATCH] noaudio: use audio_pcm_sw_read() in no_read()
@ 2011-01-03 22:40 Michael Walle
2011-01-03 22:46 ` malc
0 siblings, 1 reply; 6+ messages in thread
From: Michael Walle @ 2011-01-03 22:40 UTC (permalink / raw)
To: qemu-devel; +Cc: Michael Walle
Instead of returning a self-calculated empty buffer use the proper method
supplied by the audio subsystem. This will fix the return value of the
no_read() function which otherwise returns too many samples because
total_hw_samples_acquired isn't correctly accounted.
Signed-off-by: Michael Walle <michael@walle.cc>
---
audio/noaudio.c | 6 +-----
1 files changed, 1 insertions(+), 5 deletions(-)
diff --git a/audio/noaudio.c b/audio/noaudio.c
index 8015858..e720327 100644
--- a/audio/noaudio.c
+++ b/audio/noaudio.c
@@ -117,11 +117,7 @@ static int no_run_in (HWVoiceIn *hw)
static int no_read (SWVoiceIn *sw, void *buf, int size)
{
- int samples = size >> sw->info.shift;
- int total = sw->hw->total_samples_captured - sw->total_hw_samples_acquired;
- int to_clear = audio_MIN (samples, total);
- audio_pcm_info_clear_buf (&sw->info, buf, to_clear);
- return to_clear << sw->info.shift;
+ return audio_pcm_sw_read (sw, buf, size);
}
static int no_ctl_in (HWVoiceIn *hw, int cmd, ...)
--
1.7.2.3
^ permalink raw reply related [flat|nested] 6+ messages in thread* Re: [Qemu-devel] [PATCH] noaudio: use audio_pcm_sw_read() in no_read()
2011-01-03 22:40 [Qemu-devel] [PATCH] noaudio: use audio_pcm_sw_read() in no_read() Michael Walle
@ 2011-01-03 22:46 ` malc
2011-01-03 22:59 ` Michael Walle
0 siblings, 1 reply; 6+ messages in thread
From: malc @ 2011-01-03 22:46 UTC (permalink / raw)
To: Michael Walle; +Cc: qemu-devel
On Mon, 3 Jan 2011, Michael Walle wrote:
> Instead of returning a self-calculated empty buffer use the proper method
> supplied by the audio subsystem. This will fix the return value of the
> no_read() function which otherwise returns too many samples because
> total_hw_samples_acquired isn't correctly accounted.
What and how is incorrectly accounted? FWIW the audio_pcm_sw_read will
perform useless resampling/mixing that's why custom code is used.
[..snip..]
--
mailto:av1474@comtv.ru
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Qemu-devel] [PATCH] noaudio: use audio_pcm_sw_read() in no_read()
2011-01-03 22:46 ` malc
@ 2011-01-03 22:59 ` Michael Walle
2011-01-04 0:05 ` malc
2011-01-04 0:48 ` [Qemu-devel] [PATCH] noaudio: correctly account acquired samples Michael Walle
0 siblings, 2 replies; 6+ messages in thread
From: Michael Walle @ 2011-01-03 22:59 UTC (permalink / raw)
To: malc; +Cc: qemu-devel
On Mon, 3 Jan 2011, 23:46:34 malc wrote:
> On Mon, 3 Jan 2011, Michael Walle wrote:
> > Instead of returning a self-calculated empty buffer use the proper method
> > supplied by the audio subsystem. This will fix the return value of the
> > no_read() function which otherwise returns too many samples because
> > total_hw_samples_acquired isn't correctly accounted.
>
> What and how is incorrectly accounted? FWIW the audio_pcm_sw_read will
> perform useless resampling/mixing that's why custom code is used.
total_hw_samples_acquired is never incremented (see audio_pcm_sw_read()). As a
result the noaudio driver returns too many bytes per second.
--
Michael
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Qemu-devel] [PATCH] noaudio: use audio_pcm_sw_read() in no_read()
2011-01-03 22:59 ` Michael Walle
@ 2011-01-04 0:05 ` malc
2011-01-04 0:48 ` [Qemu-devel] [PATCH] noaudio: correctly account acquired samples Michael Walle
1 sibling, 0 replies; 6+ messages in thread
From: malc @ 2011-01-04 0:05 UTC (permalink / raw)
To: Michael Walle; +Cc: qemu-devel
On Mon, 3 Jan 2011, Michael Walle wrote:
> On Mon, 3 Jan 2011, 23:46:34 malc wrote:
> > On Mon, 3 Jan 2011, Michael Walle wrote:
> > > Instead of returning a self-calculated empty buffer use the proper method
> > > supplied by the audio subsystem. This will fix the return value of the
> > > no_read() function which otherwise returns too many samples because
> > > total_hw_samples_acquired isn't correctly accounted.
> >
> > What and how is incorrectly accounted? FWIW the audio_pcm_sw_read will
> > perform useless resampling/mixing that's why custom code is used.
> total_hw_samples_acquired is never incremented (see audio_pcm_sw_read()). As a
> result the noaudio driver returns too many bytes per second.
>
Okay, then the simpler patch should just increment it by amount in "total"
variable.
--
mailto:av1474@comtv.ru
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Qemu-devel] [PATCH] noaudio: correctly account acquired samples
2011-01-03 22:59 ` Michael Walle
2011-01-04 0:05 ` malc
@ 2011-01-04 0:48 ` Michael Walle
2011-01-04 0:54 ` malc
1 sibling, 1 reply; 6+ messages in thread
From: Michael Walle @ 2011-01-04 0:48 UTC (permalink / raw)
To: qemu-devel; +Cc: Michael Walle
This will fix the return value of the function which otherwise returns too
many samples because sw->total_hw_samples_acquired isn't correctly
accounted.
Signed-off-by: Michael Walle <michael@walle.cc>
---
audio/noaudio.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/audio/noaudio.c b/audio/noaudio.c
index 8015858..0304094 100644
--- a/audio/noaudio.c
+++ b/audio/noaudio.c
@@ -117,9 +117,12 @@ static int no_run_in (HWVoiceIn *hw)
static int no_read (SWVoiceIn *sw, void *buf, int size)
{
+ /* use custom code here instead of audio_pcm_sw_read() to avoid
+ * useless resampling/mixing */
int samples = size >> sw->info.shift;
int total = sw->hw->total_samples_captured - sw->total_hw_samples_acquired;
int to_clear = audio_MIN (samples, total);
+ sw->total_hw_samples_acquired += total;
audio_pcm_info_clear_buf (&sw->info, buf, to_clear);
return to_clear << sw->info.shift;
}
--
1.7.2.3
^ permalink raw reply related [flat|nested] 6+ messages in thread
end of thread, other threads:[~2011-01-04 0:54 UTC | newest]
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2011-01-03 22:40 [Qemu-devel] [PATCH] noaudio: use audio_pcm_sw_read() in no_read() Michael Walle
2011-01-03 22:46 ` malc
2011-01-03 22:59 ` Michael Walle
2011-01-04 0:05 ` malc
2011-01-04 0:48 ` [Qemu-devel] [PATCH] noaudio: correctly account acquired samples Michael Walle
2011-01-04 0:54 ` malc
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