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paaudio: reduce effective playback buffer size

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Add the buffer_get_free pcm_ops function to reduce the effective
playback buffer size. All intermediate audio playback buffers
become temporary buffers.

Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
Message-Id: <20220301191311.26695-11-vr_qemu@t-online.de>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Volker Rümelin 2022-03-01 20:13:07 +01:00 committed by Gerd Hoffmann
parent 9833438ef6
commit ddf2050ce6
1 changed files with 24 additions and 9 deletions
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31
audio/paaudio.c
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@ -201,13 +201,11 @@ unlock_and_fail:
return 0;
}
static void *qpa_get_buffer_out(HWVoiceOut *hw, size_t *size)
static size_t qpa_buffer_get_free(HWVoiceOut *hw)
{
PAVoiceOut *p = (PAVoiceOut *)hw;
PAConnection *c = p->g->conn;
void *ret;
size_t l;
int r;
pa_threaded_mainloop_lock(c->mainloop);
@ -216,7 +214,6 @@ static void *qpa_get_buffer_out(HWVoiceOut *hw, size_t *size)
if (pa_stream_get_state(p->stream) != PA_STREAM_READY) {
/* wait for stream to become ready */
l = 0;
ret = NULL;
goto unlock;
}
@ -224,16 +221,33 @@ static void *qpa_get_buffer_out(HWVoiceOut *hw, size_t *size)
CHECK_SUCCESS_GOTO(c, l != (size_t) -1, unlock_and_fail,
"pa_stream_writable_size failed\n");
unlock:
pa_threaded_mainloop_unlock(c->mainloop);
return l;
unlock_and_fail:
pa_threaded_mainloop_unlock(c->mainloop);
return 0;
}
static void *qpa_get_buffer_out(HWVoiceOut *hw, size_t *size)
{
PAVoiceOut *p = (PAVoiceOut *)hw;
PAConnection *c = p->g->conn;
void *ret;
int r;
pa_threaded_mainloop_lock(c->mainloop);
CHECK_DEAD_GOTO(c, p->stream, unlock_and_fail,
"pa_threaded_mainloop_lock 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");
unlock:
pa_threaded_mainloop_unlock(c->mainloop);
if (*size > l) {
*size = l;
}
return ret;
unlock_and_fail:
@ -901,6 +915,7 @@ static struct audio_pcm_ops qpa_pcm_ops = {
.init_out = qpa_init_out,
.fini_out = qpa_fini_out,
.write = qpa_write,
.buffer_get_free = qpa_buffer_get_free,
.get_buffer_out = qpa_get_buffer_out,
.put_buffer_out = qpa_put_buffer_out,
.volume_out = qpa_volume_out,