From: Gerd Hoffmann <kraxel@redhat.com>
To: qemu-devel@nongnu.org
Cc: "Volker Rümelin" <vr_qemu@t-online.de>,
"Gerd Hoffmann" <kraxel@redhat.com>,
"Markus Armbruster" <armbru@redhat.com>
Subject: [PULL 13/30] paaudio: avoid to clip samples multiple times
Date: Fri, 15 Jan 2021 14:21:29 +0100 [thread overview]
Message-ID: <20210115132146.1443592-14-kraxel@redhat.com> (raw)
In-Reply-To: <20210115132146.1443592-1-kraxel@redhat.com>
From: Volker Rümelin <vr_qemu@t-online.de>
The pulseaudio backend currently converts, clips and copies audio
playback samples in the mixing-engine sample buffer multiple
times.
In qpa_get_buffer_out() the function pa_stream_begin_write()
returns a rather large buffer and this allows audio_pcm_hw_run_out()
in audio/audio.c to copy all samples in the mixing-engine buffer
to the pulse audio buffer. Immediately after copying, qpa_write()
notices with a call to pa_stream_writable_size() that pulse audio
only needs a smaller part of the copied samples and ignores the
rest. This copy and ignore process happens several times for each
audio sample.
To fix this behaviour, call pa_stream_writable_size() in
qpa_get_buffer_out() to limit the number of samples
audio_pcm_hw_run_out() will convert. With this change the
pulseaudio pcm_ops functions put_buffer_out and write are no
longer identical and a separate qpa_put_buffer_out is needed.
Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
Message-id: 9315afe5-5958-c0b4-ea1e-14769511a9d5@t-online.de
Message-Id: <20210110100239.27588-13-vr_qemu@t-online.de>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
audio/paaudio.c | 32 +++++++++++++++++++++++++++++++-
1 file changed, 31 insertions(+), 1 deletion(-)
diff --git a/audio/paaudio.c b/audio/paaudio.c
index b05208469831..229bcfcae838 100644
--- a/audio/paaudio.c
+++ b/audio/paaudio.c
@@ -207,6 +207,7 @@ static void *qpa_get_buffer_out(HWVoiceOut *hw, size_t *size)
PAVoiceOut *p = (PAVoiceOut *) hw;
PAConnection *c = p->g->conn;
void *ret;
+ size_t l;
int r;
pa_threaded_mainloop_lock(c->mainloop);
@@ -214,12 +215,19 @@ static void *qpa_get_buffer_out(HWVoiceOut *hw, size_t *size)
CHECK_DEAD_GOTO(c, p->stream, unlock_and_fail,
"pa_threaded_mainloop_lock failed\n");
+ l = pa_stream_writable_size(p->stream);
+ CHECK_SUCCESS_GOTO(c, l != (size_t) -1, unlock_and_fail,
+ "pa_stream_writable_size failed\n");
+
*size = -1;
r = pa_stream_begin_write(p->stream, &ret, size);
CHECK_SUCCESS_GOTO(c, r >= 0, unlock_and_fail,
"pa_stream_begin_write failed\n");
pa_threaded_mainloop_unlock(c->mainloop);
+ if (*size > l) {
+ *size = l;
+ }
return ret;
unlock_and_fail:
@@ -228,6 +236,28 @@ unlock_and_fail:
return NULL;
}
+static size_t qpa_put_buffer_out(HWVoiceOut *hw, void *data, size_t length)
+{
+ PAVoiceOut *p = (PAVoiceOut *)hw;
+ PAConnection *c = p->g->conn;
+ int r;
+
+ pa_threaded_mainloop_lock(c->mainloop);
+
+ CHECK_DEAD_GOTO(c, p->stream, unlock_and_fail,
+ "pa_threaded_mainloop_lock failed\n");
+
+ r = pa_stream_write(p->stream, data, length, NULL, 0LL, PA_SEEK_RELATIVE);
+ CHECK_SUCCESS_GOTO(c, r >= 0, unlock_and_fail, "pa_stream_write failed\n");
+
+ pa_threaded_mainloop_unlock(c->mainloop);
+ return length;
+
+unlock_and_fail:
+ pa_threaded_mainloop_unlock(c->mainloop);
+ return 0;
+}
+
static size_t qpa_write(HWVoiceOut *hw, void *data, size_t length)
{
PAVoiceOut *p = (PAVoiceOut *) hw;
@@ -861,7 +891,7 @@ static struct audio_pcm_ops qpa_pcm_ops = {
.fini_out = qpa_fini_out,
.write = qpa_write,
.get_buffer_out = qpa_get_buffer_out,
- .put_buffer_out = qpa_write, /* pa handles it */
+ .put_buffer_out = qpa_put_buffer_out,
.volume_out = qpa_volume_out,
.init_in = qpa_init_in,
--
2.29.2
next prev parent reply other threads:[~2021-01-15 14:01 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-15 13:21 [PULL 00/30] Audio 20210115 patches Gerd Hoffmann
2021-01-15 13:21 ` [PULL 01/30] sdlaudio: remove leftover SDL1.2 code Gerd Hoffmann
2021-01-15 13:21 ` [PULL 02/30] audio: fix bit-rotted code Gerd Hoffmann
2021-01-15 13:21 ` [PULL 03/30] sdlaudio: add -audiodev sdl,out.buffer-count option Gerd Hoffmann
2021-01-15 13:21 ` [PULL 04/30] sdlaudio: don't start playback in init routine Gerd Hoffmann
2021-01-15 13:21 ` [PULL 05/30] sdlaudio: always clear the sample buffer Gerd Hoffmann
2021-01-15 13:21 ` [PULL 06/30] sdlaudio: fill remaining sample buffer with silence Gerd Hoffmann
2021-01-15 13:21 ` [PULL 07/30] sdlaudio: replace legacy functions with modern ones Gerd Hoffmann
2021-01-15 13:21 ` [PULL 08/30] audio: split pcm_ops function get_buffer_in Gerd Hoffmann
2021-01-15 13:21 ` [PULL 09/30] sdlaudio: add recording functions Gerd Hoffmann
2021-01-15 13:21 ` [PULL 10/30] audio: break generic buffer dependency on mixing-engine Gerd Hoffmann
2021-01-15 13:21 ` [PULL 11/30] sdlaudio: enable (in|out).mixing-engine=off Gerd Hoffmann
2021-01-15 13:21 ` [PULL 12/30] audio: remove remaining unused plive code Gerd Hoffmann
2021-01-15 13:21 ` Gerd Hoffmann [this message]
2021-01-15 13:21 ` [PULL 14/30] paaudio: wait for PA_STREAM_READY in qpa_write() Gerd Hoffmann
2021-01-15 13:21 ` [PULL 15/30] paaudio: wait until the playback stream is ready Gerd Hoffmann
2021-01-15 13:21 ` [PULL 16/30] paaudio: remove unneeded code Gerd Hoffmann
2021-01-15 13:21 ` [PULL 17/30] paaudio: comment bugs in functions qpa_init_* Gerd Hoffmann
2021-01-15 13:21 ` [PULL 18/30] paaudio: limit minreq to 75% of audio timer_rate Gerd Hoffmann
2021-01-15 13:21 ` [PULL 19/30] paaudio: send recorded data in smaller chunks Gerd Hoffmann
2021-01-15 13:21 ` [PULL 20/30] dsoundaudio: replace GetForegroundWindow() Gerd Hoffmann
2021-01-15 13:21 ` [PULL 21/30] dsoundaudio: rename dsound_open() Gerd Hoffmann
2021-01-15 13:21 ` [PULL 22/30] dsoundaudio: enable f32 audio sample format Gerd Hoffmann
2021-01-15 13:21 ` [PULL 23/30] dsoundaudio: fix log message Gerd Hoffmann
2021-01-15 13:21 ` [PULL 24/30] audio: Add braces for statements/fix braces' position Gerd Hoffmann
2021-01-15 13:21 ` [PULL 25/30] audio: Add spaces around operator/delete redundant spaces Gerd Hoffmann
2021-01-15 13:21 ` [PULL 26/30] audio: foo* bar" should be "foo *bar" Gerd Hoffmann
2021-01-15 13:21 ` [PULL 27/30] audio: Fix lines over 90 characters Gerd Hoffmann
2021-01-15 13:21 ` [PULL 28/30] audio: Don't use '%#' in format strings Gerd Hoffmann
2021-01-15 13:21 ` [PULL 29/30] audio: Suspect code indent for conditional statements Gerd Hoffmann
2021-01-15 13:21 ` [PULL 30/30] audio: space prohibited between function name and parenthesis'(' Gerd Hoffmann
2021-01-15 14:24 ` [PULL 00/30] Audio 20210115 patches no-reply
2021-01-16 12:56 ` Peter Maydell
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