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qemu-e2k/audio/pwaudio.c
Marc-André Lureau 92f69a2c9b audio/pw: improve channel position code 
Follow PulseAudio backend comment and code, and only implement the
channels QEMU actually supports at this point, and add the same comment
about limits and future mappings. Simplify a bit the code.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Volker Rümelin <vr_qemu@t-online.de>
Message-Id: <20230506163735.3481387-13-marcandre.lureau@redhat.com>
2023-07-17 15:23:31 +04:00

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/*
* QEMU PipeWire audio driver
*
* Copyright (c) 2023 Red Hat Inc.
*
* Author: Dorinda Bassey <dbassey@redhat.com>
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "qemu/module.h"
#include "audio.h"
#include <errno.h>
#include "qemu/error-report.h"
#include <spa/param/audio/format-utils.h>
#include <spa/utils/ringbuffer.h>
#include <spa/utils/result.h>
#include <spa/param/props.h>
#include <pipewire/pipewire.h>
#include "trace.h"
#define AUDIO_CAP "pipewire"
#define RINGBUFFER_SIZE (1u << 22)
#define RINGBUFFER_MASK (RINGBUFFER_SIZE - 1)
#include "audio_int.h"
typedef struct pwvolume {
uint32_t channels;
float values[SPA_AUDIO_MAX_CHANNELS];
} pwvolume;
typedef struct pwaudio {
Audiodev *dev;
struct pw_thread_loop *thread_loop;
struct pw_context *context;
struct pw_core *core;
struct spa_hook core_listener;
int last_seq, pending_seq, error;
} pwaudio;
typedef struct PWVoice {
pwaudio *g;
struct pw_stream *stream;
struct spa_hook stream_listener;
struct spa_audio_info_raw info;
uint32_t highwater_mark;
uint32_t frame_size, req;
struct spa_ringbuffer ring;
uint8_t buffer[RINGBUFFER_SIZE];
pwvolume volume;
bool muted;
} PWVoice;
typedef struct PWVoiceOut {
HWVoiceOut hw;
PWVoice v;
} PWVoiceOut;
typedef struct PWVoiceIn {
HWVoiceIn hw;
PWVoice v;
} PWVoiceIn;
#define PW_VOICE_IN(v) ((PWVoiceIn *)v)
#define PW_VOICE_OUT(v) ((PWVoiceOut *)v)
static void
stream_destroy(void *data)
{
PWVoice *v = (PWVoice *) data;
spa_hook_remove(&v->stream_listener);
v->stream = NULL;
}
/* output data processing function to read stuffs from the buffer */
static void
playback_on_process(void *data)
{
PWVoice *v = data;
void *p;
struct pw_buffer *b;
struct spa_buffer *buf;
uint32_t req, index, n_bytes;
int32_t avail;
assert(v->stream);
/* obtain a buffer to read from */
b = pw_stream_dequeue_buffer(v->stream);
if (b == NULL) {
error_report("out of buffers: %s", strerror(errno));
return;
}
buf = b->buffer;
p = buf->datas[0].data;
if (p == NULL) {
return;
}
/* calculate the total no of bytes to read data from buffer */
req = b->requested * v->frame_size;
if (req == 0) {
req = v->req;
}
n_bytes = SPA_MIN(req, buf->datas[0].maxsize);
/* get no of available bytes to read data from buffer */
avail = spa_ringbuffer_get_read_index(&v->ring, &index);
if (avail <= 0) {
PWVoiceOut *vo = container_of(data, PWVoiceOut, v);
audio_pcm_info_clear_buf(&vo->hw.info, p, n_bytes / v->frame_size);
} else {
if ((uint32_t) avail < n_bytes) {
/*
* PipeWire immediately calls this callback again if we provide
* less than n_bytes. Then audio_pcm_info_clear_buf() fills the
* rest of the buffer with silence.
*/
n_bytes = avail;
}
spa_ringbuffer_read_data(&v->ring,
v->buffer, RINGBUFFER_SIZE,
index & RINGBUFFER_MASK, p, n_bytes);
index += n_bytes;
spa_ringbuffer_read_update(&v->ring, index);
}
buf->datas[0].chunk->offset = 0;
buf->datas[0].chunk->stride = v->frame_size;
buf->datas[0].chunk->size = n_bytes;
/* queue the buffer for playback */
pw_stream_queue_buffer(v->stream, b);
}
/* output data processing function to generate stuffs in the buffer */
static void
capture_on_process(void *data)
{
PWVoice *v = (PWVoice *) data;
void *p;
struct pw_buffer *b;
struct spa_buffer *buf;
int32_t filled;
uint32_t index, offs, n_bytes;
assert(v->stream);
/* obtain a buffer */
b = pw_stream_dequeue_buffer(v->stream);
if (b == NULL) {
error_report("out of buffers: %s", strerror(errno));
return;
}
/* Write data into buffer */
buf = b->buffer;
p = buf->datas[0].data;
if (p == NULL) {
return;
}
offs = SPA_MIN(buf->datas[0].chunk->offset, buf->datas[0].maxsize);
n_bytes = SPA_MIN(buf->datas[0].chunk->size, buf->datas[0].maxsize - offs);
filled = spa_ringbuffer_get_write_index(&v->ring, &index);
if (filled < 0) {
error_report("%p: underrun write:%u filled:%d", p, index, filled);
} else {
if ((uint32_t) filled + n_bytes > RINGBUFFER_SIZE) {
error_report("%p: overrun write:%u filled:%d + size:%u > max:%u",
p, index, filled, n_bytes, RINGBUFFER_SIZE);
}
}
spa_ringbuffer_write_data(&v->ring,
v->buffer, RINGBUFFER_SIZE,
index & RINGBUFFER_MASK,
SPA_PTROFF(p, offs, void), n_bytes);
index += n_bytes;
spa_ringbuffer_write_update(&v->ring, index);
/* queue the buffer for playback */
pw_stream_queue_buffer(v->stream, b);
}
static void
on_stream_state_changed(void *data, enum pw_stream_state old,
enum pw_stream_state state, const char *error)
{
PWVoice *v = (PWVoice *) data;
trace_pw_state_changed(pw_stream_get_node_id(v->stream),
pw_stream_state_as_string(state));
}
static const struct pw_stream_events capture_stream_events = {
PW_VERSION_STREAM_EVENTS,
.destroy = stream_destroy,
.state_changed = on_stream_state_changed,
.process = capture_on_process
};
static const struct pw_stream_events playback_stream_events = {
PW_VERSION_STREAM_EVENTS,
.destroy = stream_destroy,
.state_changed = on_stream_state_changed,
.process = playback_on_process
};
static size_t
qpw_read(HWVoiceIn *hw, void *data, size_t len)
{
PWVoiceIn *pw = (PWVoiceIn *) hw;
PWVoice *v = &pw->v;
pwaudio *c = v->g;
const char *error = NULL;
size_t l;
int32_t avail;
uint32_t index;
pw_thread_loop_lock(c->thread_loop);
if (pw_stream_get_state(v->stream, &error) != PW_STREAM_STATE_STREAMING) {
/* wait for stream to become ready */
l = 0;
goto done_unlock;
}
/* get no of available bytes to read data from buffer */
avail = spa_ringbuffer_get_read_index(&v->ring, &index);
trace_pw_read(avail, index, len);
if (avail < (int32_t) len) {
len = avail;
}
spa_ringbuffer_read_data(&v->ring,
v->buffer, RINGBUFFER_SIZE,
index & RINGBUFFER_MASK, data, len);
index += len;
spa_ringbuffer_read_update(&v->ring, index);
l = len;
done_unlock:
pw_thread_loop_unlock(c->thread_loop);
return l;
}
static size_t qpw_buffer_get_free(HWVoiceOut *hw)
{
PWVoiceOut *pw = (PWVoiceOut *)hw;
PWVoice *v = &pw->v;
pwaudio *c = v->g;
const char *error = NULL;
int32_t filled, avail;
uint32_t index;
pw_thread_loop_lock(c->thread_loop);
if (pw_stream_get_state(v->stream, &error) != PW_STREAM_STATE_STREAMING) {
/* wait for stream to become ready */
avail = 0;
goto done_unlock;
}
filled = spa_ringbuffer_get_write_index(&v->ring, &index);
avail = v->highwater_mark - filled;
done_unlock:
pw_thread_loop_unlock(c->thread_loop);
return avail;
}
static size_t
qpw_write(HWVoiceOut *hw, void *data, size_t len)
{
PWVoiceOut *pw = (PWVoiceOut *) hw;
PWVoice *v = &pw->v;
pwaudio *c = v->g;
const char *error = NULL;
int32_t filled, avail;
uint32_t index;
pw_thread_loop_lock(c->thread_loop);
if (pw_stream_get_state(v->stream, &error) != PW_STREAM_STATE_STREAMING) {
/* wait for stream to become ready */
len = 0;
goto done_unlock;
}
filled = spa_ringbuffer_get_write_index(&v->ring, &index);
avail = v->highwater_mark - filled;
trace_pw_write(filled, avail, index, len);
if (len > avail) {
len = avail;
}
if (filled < 0) {
error_report("%p: underrun write:%u filled:%d", pw, index, filled);
} else {
if ((uint32_t) filled + len > RINGBUFFER_SIZE) {
error_report("%p: overrun write:%u filled:%d + size:%zu > max:%u",
pw, index, filled, len, RINGBUFFER_SIZE);
}
}
spa_ringbuffer_write_data(&v->ring,
v->buffer, RINGBUFFER_SIZE,
index & RINGBUFFER_MASK, data, len);
index += len;
spa_ringbuffer_write_update(&v->ring, index);
done_unlock:
pw_thread_loop_unlock(c->thread_loop);
return len;
}
static int
audfmt_to_pw(AudioFormat fmt, int endianness)
{
int format;
switch (fmt) {
case AUDIO_FORMAT_S8:
format = SPA_AUDIO_FORMAT_S8;
break;
case AUDIO_FORMAT_U8:
format = SPA_AUDIO_FORMAT_U8;
break;
case AUDIO_FORMAT_S16:
format = endianness ? SPA_AUDIO_FORMAT_S16_BE : SPA_AUDIO_FORMAT_S16_LE;
break;
case AUDIO_FORMAT_U16:
format = endianness ? SPA_AUDIO_FORMAT_U16_BE : SPA_AUDIO_FORMAT_U16_LE;
break;
case AUDIO_FORMAT_S32:
format = endianness ? SPA_AUDIO_FORMAT_S32_BE : SPA_AUDIO_FORMAT_S32_LE;
break;
case AUDIO_FORMAT_U32:
format = endianness ? SPA_AUDIO_FORMAT_U32_BE : SPA_AUDIO_FORMAT_U32_LE;
break;
case AUDIO_FORMAT_F32:
format = endianness ? SPA_AUDIO_FORMAT_F32_BE : SPA_AUDIO_FORMAT_F32_LE;
break;
default:
dolog("Internal logic error: Bad audio format %d\n", fmt);
format = SPA_AUDIO_FORMAT_U8;
break;
}
return format;
}
static AudioFormat
pw_to_audfmt(enum spa_audio_format fmt, int *endianness,
uint32_t *sample_size)
{
switch (fmt) {
case SPA_AUDIO_FORMAT_S8:
*sample_size = 1;
return AUDIO_FORMAT_S8;
case SPA_AUDIO_FORMAT_U8:
*sample_size = 1;
return AUDIO_FORMAT_U8;
case SPA_AUDIO_FORMAT_S16_BE:
*sample_size = 2;
*endianness = 1;
return AUDIO_FORMAT_S16;
case SPA_AUDIO_FORMAT_S16_LE:
*sample_size = 2;
*endianness = 0;
return AUDIO_FORMAT_S16;
case SPA_AUDIO_FORMAT_U16_BE:
*sample_size = 2;
*endianness = 1;
return AUDIO_FORMAT_U16;
case SPA_AUDIO_FORMAT_U16_LE:
*sample_size = 2;
*endianness = 0;
return AUDIO_FORMAT_U16;
case SPA_AUDIO_FORMAT_S32_BE:
*sample_size = 4;
*endianness = 1;
return AUDIO_FORMAT_S32;
case SPA_AUDIO_FORMAT_S32_LE:
*sample_size = 4;
*endianness = 0;
return AUDIO_FORMAT_S32;
case SPA_AUDIO_FORMAT_U32_BE:
*sample_size = 4;
*endianness = 1;
return AUDIO_FORMAT_U32;
case SPA_AUDIO_FORMAT_U32_LE:
*sample_size = 4;
*endianness = 0;
return AUDIO_FORMAT_U32;
case SPA_AUDIO_FORMAT_F32_BE:
*sample_size = 4;
*endianness = 1;
return AUDIO_FORMAT_F32;
case SPA_AUDIO_FORMAT_F32_LE:
*sample_size = 4;
*endianness = 0;
return AUDIO_FORMAT_F32;
default:
*sample_size = 1;
dolog("Internal logic error: Bad spa_audio_format %d\n", fmt);
return AUDIO_FORMAT_U8;
}
}
static int
qpw_stream_new(pwaudio *c, PWVoice *v, const char *stream_name,
const char *name, enum spa_direction dir)
{
int res;
uint32_t n_params;
const struct spa_pod *params[2];
uint8_t buffer[1024];
struct spa_pod_builder b;
uint64_t buf_samples;
struct pw_properties *props;
props = pw_properties_new(NULL, NULL);
if (!props) {
error_report("Failed to create PW properties: %s", g_strerror(errno));
return -1;
}
/* 75% of the timer period for faster updates */
buf_samples = (uint64_t)v->g->dev->timer_period * v->info.rate
* 3 / 4 / 1000000;
pw_properties_setf(props, PW_KEY_NODE_LATENCY, "%" PRIu64 "/%u",
buf_samples, v->info.rate);
trace_pw_period(buf_samples, v->info.rate);
if (name) {
pw_properties_set(props, PW_KEY_TARGET_OBJECT, name);
}
v->stream = pw_stream_new(c->core, stream_name, props);
if (v->stream == NULL) {
error_report("Failed to create PW stream: %s", g_strerror(errno));
return -1;
}
if (dir == SPA_DIRECTION_INPUT) {
pw_stream_add_listener(v->stream,
&v->stream_listener, &capture_stream_events, v);
} else {
pw_stream_add_listener(v->stream,
&v->stream_listener, &playback_stream_events, v);
}
n_params = 0;
spa_pod_builder_init(&b, buffer, sizeof(buffer));
params[n_params++] = spa_format_audio_raw_build(&b,
SPA_PARAM_EnumFormat,
&v->info);
/* connect the stream to a sink or source */
res = pw_stream_connect(v->stream,
dir ==
SPA_DIRECTION_INPUT ? PW_DIRECTION_INPUT :
PW_DIRECTION_OUTPUT, PW_ID_ANY,
PW_STREAM_FLAG_AUTOCONNECT |
PW_STREAM_FLAG_INACTIVE |
PW_STREAM_FLAG_MAP_BUFFERS |
PW_STREAM_FLAG_RT_PROCESS, params, n_params);
if (res < 0) {
error_report("Failed to connect PW stream: %s", g_strerror(errno));
pw_stream_destroy(v->stream);
return -1;
}
return 0;
}
static void
qpw_set_position(uint32_t channels, uint32_t position[SPA_AUDIO_MAX_CHANNELS])
{
memcpy(position, (uint32_t[SPA_AUDIO_MAX_CHANNELS]) { SPA_AUDIO_CHANNEL_UNKNOWN, },
sizeof(uint32_t) * SPA_AUDIO_MAX_CHANNELS);
/*
* TODO: This currently expects the only frontend supporting more than 2
* channels is the usb-audio. We will need some means to set channel
* order when a new frontend gains multi-channel support.
*/
switch (channels) {
case 8:
position[6] = SPA_AUDIO_CHANNEL_SL;
position[7] = SPA_AUDIO_CHANNEL_SR;
/* fallthrough */
case 6:
position[2] = SPA_AUDIO_CHANNEL_FC;
position[3] = SPA_AUDIO_CHANNEL_LFE;
position[4] = SPA_AUDIO_CHANNEL_RL;
position[5] = SPA_AUDIO_CHANNEL_RR;
/* fallthrough */
case 2:
position[0] = SPA_AUDIO_CHANNEL_FL;
position[1] = SPA_AUDIO_CHANNEL_FR;
break;
case 1:
position[0] = SPA_AUDIO_CHANNEL_MONO;
break;
default:
dolog("Internal error: unsupported channel count %d\n", channels);
}
}
static int
qpw_init_out(HWVoiceOut *hw, struct audsettings *as, void *drv_opaque)
{
PWVoiceOut *pw = (PWVoiceOut *) hw;
PWVoice *v = &pw->v;
struct audsettings obt_as = *as;
pwaudio *c = v->g = drv_opaque;
AudiodevPipewireOptions *popts = &c->dev->u.pipewire;
AudiodevPipewirePerDirectionOptions *ppdo = popts->out;
int r;
pw_thread_loop_lock(c->thread_loop);
v->info.format = audfmt_to_pw(as->fmt, as->endianness);
v->info.channels = as->nchannels;
qpw_set_position(as->nchannels, v->info.position);
v->info.rate = as->freq;
obt_as.fmt =
pw_to_audfmt(v->info.format, &obt_as.endianness, &v->frame_size);
v->frame_size *= as->nchannels;
v->req = (uint64_t)c->dev->timer_period * v->info.rate
* 1 / 2 / 1000000 * v->frame_size;
/* call the function that creates a new stream for playback */
r = qpw_stream_new(c, v, ppdo->stream_name ? : c->dev->id,
ppdo->name, SPA_DIRECTION_OUTPUT);
if (r < 0) {
pw_thread_loop_unlock(c->thread_loop);
return -1;
}
/* report the audio format we support */
audio_pcm_init_info(&hw->info, &obt_as);
/* report the buffer size to qemu */
hw->samples = audio_buffer_frames(
qapi_AudiodevPipewirePerDirectionOptions_base(ppdo), &obt_as, 46440);
v->highwater_mark = MIN(RINGBUFFER_SIZE,
(ppdo->has_latency ? ppdo->latency : 46440)
* (uint64_t)v->info.rate / 1000000 * v->frame_size);
pw_thread_loop_unlock(c->thread_loop);
return 0;
}
static int
qpw_init_in(HWVoiceIn *hw, struct audsettings *as, void *drv_opaque)
{
PWVoiceIn *pw = (PWVoiceIn *) hw;
PWVoice *v = &pw->v;
struct audsettings obt_as = *as;
pwaudio *c = v->g = drv_opaque;
AudiodevPipewireOptions *popts = &c->dev->u.pipewire;
AudiodevPipewirePerDirectionOptions *ppdo = popts->in;
int r;
pw_thread_loop_lock(c->thread_loop);
v->info.format = audfmt_to_pw(as->fmt, as->endianness);
v->info.channels = as->nchannels;
qpw_set_position(as->nchannels, v->info.position);
v->info.rate = as->freq;
obt_as.fmt =
pw_to_audfmt(v->info.format, &obt_as.endianness, &v->frame_size);
v->frame_size *= as->nchannels;
/* call the function that creates a new stream for recording */
r = qpw_stream_new(c, v, ppdo->stream_name ? : c->dev->id,
ppdo->name, SPA_DIRECTION_INPUT);
if (r < 0) {
pw_thread_loop_unlock(c->thread_loop);
return -1;
}
/* report the audio format we support */
audio_pcm_init_info(&hw->info, &obt_as);
/* report the buffer size to qemu */
hw->samples = audio_buffer_frames(
qapi_AudiodevPipewirePerDirectionOptions_base(ppdo), &obt_as, 46440);
pw_thread_loop_unlock(c->thread_loop);
return 0;
}
static void
qpw_voice_fini(PWVoice *v)
{
pwaudio *c = v->g;
if (!v->stream) {
return;
}
pw_thread_loop_lock(c->thread_loop);
pw_stream_destroy(v->stream);
v->stream = NULL;
pw_thread_loop_unlock(c->thread_loop);
}
static void
qpw_fini_out(HWVoiceOut *hw)
{
qpw_voice_fini(&PW_VOICE_OUT(hw)->v);
}
static void
qpw_fini_in(HWVoiceIn *hw)
{
qpw_voice_fini(&PW_VOICE_IN(hw)->v);
}
static void
qpw_voice_set_enabled(PWVoice *v, bool enable)
{
pwaudio *c = v->g;
pw_thread_loop_lock(c->thread_loop);
pw_stream_set_active(v->stream, enable);
pw_thread_loop_unlock(c->thread_loop);
}
static void
qpw_enable_out(HWVoiceOut *hw, bool enable)
{
qpw_voice_set_enabled(&PW_VOICE_OUT(hw)->v, enable);
}
static void
qpw_enable_in(HWVoiceIn *hw, bool enable)
{
qpw_voice_set_enabled(&PW_VOICE_IN(hw)->v, enable);
}
static void
qpw_voice_set_volume(PWVoice *v, Volume *vol)
{
pwaudio *c = v->g;
int i, ret;
pw_thread_loop_lock(c->thread_loop);
v->volume.channels = vol->channels;
for (i = 0; i < vol->channels; ++i) {
v->volume.values[i] = (float)vol->vol[i] / 255;
}
ret = pw_stream_set_control(v->stream,
SPA_PROP_channelVolumes, v->volume.channels, v->volume.values, 0);
trace_pw_vol(ret == 0 ? "success" : "failed");
v->muted = vol->mute;
float val = v->muted ? 1.f : 0.f;
ret = pw_stream_set_control(v->stream, SPA_PROP_mute, 1, &val, 0);
pw_thread_loop_unlock(c->thread_loop);
}
static void
qpw_volume_out(HWVoiceOut *hw, Volume *vol)
{
qpw_voice_set_volume(&PW_VOICE_OUT(hw)->v, vol);
}
static void
qpw_volume_in(HWVoiceIn *hw, Volume *vol)
{
qpw_voice_set_volume(&PW_VOICE_IN(hw)->v, vol);
}
static int wait_resync(pwaudio *pw)
{
int res;
pw->pending_seq = pw_core_sync(pw->core, PW_ID_CORE, pw->pending_seq);
while (true) {
pw_thread_loop_wait(pw->thread_loop);
res = pw->error;
if (res < 0) {
pw->error = 0;
return res;
}
if (pw->pending_seq == pw->last_seq) {
break;
}
}
return 0;
}
static void
on_core_error(void *data, uint32_t id, int seq, int res, const char *message)
{
pwaudio *pw = data;
error_report("error id:%u seq:%d res:%d (%s): %s",
id, seq, res, spa_strerror(res), message);
/* stop and exit the thread loop */
pw_thread_loop_signal(pw->thread_loop, FALSE);
}
static void
on_core_done(void *data, uint32_t id, int seq)
{
pwaudio *pw = data;
assert(id == PW_ID_CORE);
pw->last_seq = seq;
if (pw->pending_seq == seq) {
/* stop and exit the thread loop */
pw_thread_loop_signal(pw->thread_loop, FALSE);
}
}
static const struct pw_core_events core_events = {
PW_VERSION_CORE_EVENTS,
.done = on_core_done,
.error = on_core_error,
};
static void *
qpw_audio_init(Audiodev *dev)
{
g_autofree pwaudio *pw = g_new0(pwaudio, 1);
assert(dev->driver == AUDIODEV_DRIVER_PIPEWIRE);
trace_pw_audio_init();
pw_init(NULL, NULL);
pw->dev = dev;
pw->thread_loop = pw_thread_loop_new("PipeWire thread loop", NULL);
if (pw->thread_loop == NULL) {
error_report("Could not create PipeWire loop: %s", g_strerror(errno));
goto fail;
}
pw->context =
pw_context_new(pw_thread_loop_get_loop(pw->thread_loop), NULL, 0);
if (pw->context == NULL) {
error_report("Could not create PipeWire context: %s", g_strerror(errno));
goto fail;
}
if (pw_thread_loop_start(pw->thread_loop) < 0) {
error_report("Could not start PipeWire loop: %s", g_strerror(errno));
goto fail;
}
pw_thread_loop_lock(pw->thread_loop);
pw->core = pw_context_connect(pw->context, NULL, 0);
if (pw->core == NULL) {
pw_thread_loop_unlock(pw->thread_loop);
goto fail;
}
if (pw_core_add_listener(pw->core, &pw->core_listener,
&core_events, pw) < 0) {
pw_thread_loop_unlock(pw->thread_loop);
goto fail;
}
if (wait_resync(pw) < 0) {
pw_thread_loop_unlock(pw->thread_loop);
}
pw_thread_loop_unlock(pw->thread_loop);
return g_steal_pointer(&pw);
fail:
AUD_log(AUDIO_CAP, "Failed to initialize PW context");
if (pw->thread_loop) {
pw_thread_loop_stop(pw->thread_loop);
}
g_clear_pointer(&pw->context, pw_context_destroy);
g_clear_pointer(&pw->thread_loop, pw_thread_loop_destroy);
return NULL;
}
static void
qpw_audio_fini(void *opaque)
{
pwaudio *pw = opaque;
if (pw->thread_loop) {
pw_thread_loop_stop(pw->thread_loop);
}
if (pw->core) {
spa_hook_remove(&pw->core_listener);
spa_zero(pw->core_listener);
pw_core_disconnect(pw->core);
}
if (pw->context) {
pw_context_destroy(pw->context);
}
pw_thread_loop_destroy(pw->thread_loop);
g_free(pw);
}
static struct audio_pcm_ops qpw_pcm_ops = {
.init_out = qpw_init_out,
.fini_out = qpw_fini_out,
.write = qpw_write,
.buffer_get_free = qpw_buffer_get_free,
.run_buffer_out = audio_generic_run_buffer_out,
.enable_out = qpw_enable_out,
.volume_out = qpw_volume_out,
.volume_in = qpw_volume_in,
.init_in = qpw_init_in,
.fini_in = qpw_fini_in,
.read = qpw_read,
.run_buffer_in = audio_generic_run_buffer_in,
.enable_in = qpw_enable_in
};
static struct audio_driver pw_audio_driver = {
.name = "pipewire",
.descr = "http://www.pipewire.org/",
.init = qpw_audio_init,
.fini = qpw_audio_fini,
.pcm_ops = &qpw_pcm_ops,
.can_be_default = 1,
.max_voices_out = INT_MAX,
.max_voices_in = INT_MAX,
.voice_size_out = sizeof(PWVoiceOut),
.voice_size_in = sizeof(PWVoiceIn),
};
static void
register_audio_pw(void)
{
audio_driver_register(&pw_audio_driver);
}
type_init(register_audio_pw);
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