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spiceaudio: add a pcm_ops buffer_get_free function

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It seems there is a demand [1] for low latency playback over
SPICE. Add a pcm_ops buffer_get_free function to reduce the
playback latency. The mixing engine buffer becomes a temporary
buffer.

[1] https://lists.nongnu.org/archive/html/qemu-devel/2022-01/msg01644.html

Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20220923183640.8314-6-vr_qemu@t-online.de>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Volker Rümelin 2022-09-23 20:36:34 +02:00 committed by Gerd Hoffmann
parent 02732641c0
commit 90320051ea
1 changed files with 10 additions and 2 deletions
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12
audio/spiceaudio.c
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@ -120,6 +120,13 @@ static void line_out_fini (HWVoiceOut *hw)
spice_server_remove_interface (&out->sin.base);
}
static size_t line_out_get_free(HWVoiceOut *hw)
{
SpiceVoiceOut *out = container_of(hw, SpiceVoiceOut, hw);
return audio_rate_peek_bytes(&out->rate, &hw->info);
}
static void *line_out_get_buffer(HWVoiceOut *hw, size_t *size)
{
SpiceVoiceOut *out = container_of(hw, SpiceVoiceOut, hw);
@ -133,8 +140,6 @@ static void *line_out_get_buffer(HWVoiceOut *hw, size_t *size)
*size = MIN((out->fsize - out->fpos) << 2, *size);
}
*size = audio_rate_get_bytes(&hw->info, &out->rate, *size);
return out->frame + out->fpos;
}
@ -142,6 +147,8 @@ static size_t line_out_put_buffer(HWVoiceOut *hw, void *buf, size_t size)
{
SpiceVoiceOut *out = container_of(hw, SpiceVoiceOut, hw);
audio_rate_add_bytes(&out->rate, size);
if (buf) {
assert(buf == out->frame + out->fpos && out->fpos <= out->fsize);
out->fpos += size >> 2;
@ -282,6 +289,7 @@ static struct audio_pcm_ops audio_callbacks = {
.init_out = line_out_init,
.fini_out = line_out_fini,
.write = audio_generic_write,
.buffer_get_free = line_out_get_free,
.get_buffer_out = line_out_get_buffer,
.put_buffer_out = line_out_put_buffer,
.enable_out = line_out_enable,