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vlc/modules/audio_output/pulse.c

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/*****************************************************************************
* pulse.c : Pulseaudio output plugin for vlc
*****************************************************************************
* Copyright (C) 2008 VLC authors and VideoLAN
* Copyright (C) 2009-2011 Rémi Denis-Courmont
*
* Authors: Martin Hamrle <hamrle @ post . cz>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <assert.h>
#include <math.h>
#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_aout.h>
#include <vlc_cpu.h>
#include <pulse/pulseaudio.h>
#include "audio_output/vlcpulse.h"
static int Open ( vlc_object_t * );
static void Close ( vlc_object_t * );
vlc_module_begin ()
set_shortname( "PulseAudio" )
set_description( N_("Pulseaudio audio output") )
set_capability( "audio output", 160 )
set_category( CAT_AUDIO )
set_subcategory( SUBCAT_AUDIO_AOUT )
add_shortcut( "pulseaudio", "pa" )
set_callbacks( Open, Close )
vlc_module_end ()
/* NOTE:
* Be careful what you do when the PulseAudio mainloop is held, which is to say
* within PulseAudio callbacks, or after pa_threaded_mainloop_lock().
* In particular, a VLC variable callback cannot be triggered nor deleted with
* the PulseAudio mainloop lock held, if the callback acquires the lock. */
struct sink
{
struct sink *next;
uint32_t index;
char name[1];
};
typedef struct
{
pa_stream *stream; /**< PulseAudio playback stream object */
pa_context *context; /**< PulseAudio connection context */
pa_threaded_mainloop *mainloop; /**< PulseAudio thread */
pa_time_event *trigger; /**< Deferred stream trigger */
pa_cvolume cvolume; /**< actual sink input volume */
vlc_tick_t last_date; /**< Play system timestamp of last buffer */
pa_volume_t volume_force; /**< Forced volume (stream must be NULL) */
pa_stream_flags_t flags_force; /**< Forced flags (stream must be NULL) */
char *sink_force; /**< Forced sink name (stream must be NULL) */
struct sink *sinks; /**< Locally-cached list of sinks */
} aout_sys_t;
static void VolumeReport(audio_output_t *aout)
{
aout_sys_t *sys = aout->sys;
pa_volume_t volume = pa_cvolume_max(&sys->cvolume);
aout_VolumeReport(aout, (float)volume / PA_VOLUME_NORM);
}
/*** Sink ***/
static void sink_add_cb(pa_context *ctx, const pa_sink_info *i, int eol,
void *userdata)
{
audio_output_t *aout = userdata;
aout_sys_t *sys = aout->sys;
if (eol)
{
pa_threaded_mainloop_signal(sys->mainloop, 0);
return;
}
(void) ctx;
msg_Dbg(aout, "adding sink %"PRIu32": %s (%s)", i->index, i->name,
i->description);
aout_HotplugReport(aout, i->name, i->description);
size_t namelen = strlen(i->name);
struct sink *sink = malloc(sizeof (*sink) + namelen);
if (unlikely(sink == NULL))
return;
sink->next = sys->sinks;
sink->index = i->index;
memcpy(sink->name, i->name, namelen + 1);
sys->sinks = sink;
}
static void sink_mod_cb(pa_context *ctx, const pa_sink_info *i, int eol,
void *userdata)
{
audio_output_t *aout = userdata;
if (eol)
return;
(void) ctx;
msg_Dbg(aout, "changing sink %"PRIu32": %s (%s)", i->index, i->name,
i->description);
aout_HotplugReport(aout, i->name, i->description);
}
static void sink_del(uint32_t index, audio_output_t *aout)
{
aout_sys_t *sys = aout->sys;
struct sink **pp = &sys->sinks, *sink;
msg_Dbg(aout, "removing sink %"PRIu32, index);
while ((sink = *pp) != NULL)
if (sink->index == index)
{
*pp = sink->next;
aout_HotplugReport(aout, sink->name, NULL);
free(sink);
}
else
pp = &sink->next;
}
static void sink_event(pa_context *ctx, unsigned type, uint32_t idx,
audio_output_t *aout)
{
pa_operation *op = NULL;
switch (type)
{
case PA_SUBSCRIPTION_EVENT_NEW:
op = pa_context_get_sink_info_by_index(ctx, idx, sink_add_cb,
aout);
break;
case PA_SUBSCRIPTION_EVENT_CHANGE:
op = pa_context_get_sink_info_by_index(ctx, idx, sink_mod_cb,
aout);
break;
case PA_SUBSCRIPTION_EVENT_REMOVE:
sink_del(idx, aout);
break;
}
if (op != NULL)
pa_operation_unref(op);
}
/*** Latency management and lip synchronization ***/
static void stream_start_now(pa_stream *s, audio_output_t *aout)
{
pa_operation *op;
assert ( ((aout_sys_t *)aout->sys)->trigger == NULL );
op = pa_stream_cork(s, 0, NULL, NULL);
if (op != NULL)
pa_operation_unref(op);
op = pa_stream_trigger(s, NULL, NULL);
if (likely(op != NULL))
pa_operation_unref(op);
}
static void stream_stop(pa_stream *s, audio_output_t *aout)
{
aout_sys_t *sys = aout->sys;
pa_operation *op;
if (sys->trigger != NULL) {
vlc_pa_rttime_free(sys->mainloop, sys->trigger);
sys->trigger = NULL;
}
op = pa_stream_cork(s, 1, NULL, NULL);
if (op != NULL)
pa_operation_unref(op);
}
static void stream_trigger_cb(pa_mainloop_api *api, pa_time_event *e,
const struct timeval *tv, void *userdata)
{
audio_output_t *aout = userdata;
aout_sys_t *sys = aout->sys;
assert (sys->trigger == e);
msg_Dbg(aout, "starting deferred");
vlc_pa_rttime_free(sys->mainloop, sys->trigger);
sys->trigger = NULL;
stream_start_now(sys->stream, aout);
(void) api; (void) e; (void) tv;
}
/**
* Starts or resumes the playback stream.
* Tries start playing back audio samples at the most accurate time
* in order to minimize desync and resampling during early playback.
* @note PulseAudio lock required.
*/
static void stream_start(pa_stream *s, audio_output_t *aout, vlc_tick_t date)
{
aout_sys_t *sys = aout->sys;
vlc_tick_t delta;
assert (sys->last_date != VLC_TICK_INVALID);
if (sys->trigger != NULL) {
vlc_pa_rttime_free(sys->mainloop, sys->trigger);
sys->trigger = NULL;
}
delta = vlc_pa_get_latency(aout, sys->context, s);
if (unlikely(delta == VLC_TICK_INVALID)) {
msg_Dbg(aout, "cannot synchronize start");
delta = 0; /* screwed */
}
delta = (date - vlc_tick_now()) - delta;
if (delta > 0) {
msg_Dbg(aout, "deferring start (%"PRId64" us)", delta);
delta += pa_rtclock_now();
sys->trigger = pa_context_rttime_new(sys->context, delta,
stream_trigger_cb, aout);
} else {
msg_Warn(aout, "starting late (%"PRId64" us)", delta);
stream_start_now(s, aout);
}
}
static void stream_latency_cb(pa_stream *s, void *userdata)
{
audio_output_t *aout = userdata;
aout_sys_t *sys = aout->sys;
/* This callback is _never_ called while paused. */
if (sys->last_date == VLC_TICK_INVALID)
return; /* nothing to do if buffers are (still) empty */
if (pa_stream_is_corked(s) > 0)
stream_start(s, aout, sys->last_date);
}
/*** Stream helpers ***/
static void stream_state_cb(pa_stream *s, void *userdata)
{
pa_threaded_mainloop *mainloop = userdata;
switch (pa_stream_get_state(s)) {
case PA_STREAM_READY:
case PA_STREAM_FAILED:
case PA_STREAM_TERMINATED:
pa_threaded_mainloop_signal(mainloop, 0);
default:
break;
}
}
static void stream_buffer_attr_cb(pa_stream *s, void *userdata)
{
audio_output_t *aout = userdata;
const pa_buffer_attr *pba = pa_stream_get_buffer_attr(s);
msg_Dbg(aout, "changed buffer metrics: maxlength=%u, tlength=%u, "
"prebuf=%u, minreq=%u",
pba->maxlength, pba->tlength, pba->prebuf, pba->minreq);
}
static void stream_event_cb(pa_stream *s, const char *name, pa_proplist *pl,
void *userdata)
{
audio_output_t *aout = userdata;
if (!strcmp(name, PA_STREAM_EVENT_REQUEST_CORK))
aout_PolicyReport(aout, true);
else
if (!strcmp(name, PA_STREAM_EVENT_REQUEST_UNCORK))
aout_PolicyReport(aout, false);
else
/* FIXME: expose aout_Restart() directly */
if (!strcmp(name, PA_STREAM_EVENT_FORMAT_LOST)) {
msg_Dbg (aout, "format lost");
aout_RestartRequest (aout, AOUT_RESTART_OUTPUT);
} else
msg_Warn (aout, "unhandled stream event \"%s\"", name);
(void) s;
(void) pl;
}
static void stream_moved_cb(pa_stream *s, void *userdata)
{
audio_output_t *aout = userdata;
const char *name = pa_stream_get_device_name(s);
msg_Dbg(aout, "connected to sink %s", name);
aout_DeviceReport(aout, name);
}
static void stream_overflow_cb(pa_stream *s, void *userdata)
{
audio_output_t *aout = userdata;
aout_sys_t *sys = aout->sys;
pa_operation *op;
msg_Err(aout, "overflow, flushing");
op = pa_stream_flush(s, NULL, NULL);
if (unlikely(op == NULL))
return;
pa_operation_unref(op);
sys->last_date = VLC_TICK_INVALID;
}
static void stream_started_cb(pa_stream *s, void *userdata)
{
audio_output_t *aout = userdata;
msg_Dbg(aout, "started");
(void) s;
}
static void stream_suspended_cb(pa_stream *s, void *userdata)
{
audio_output_t *aout = userdata;
msg_Dbg(aout, "suspended");
(void) s;
}
static void stream_underflow_cb(pa_stream *s, void *userdata)
{
audio_output_t *aout = userdata;
msg_Dbg(aout, "underflow");
(void) s;
}
static int stream_wait(pa_stream *stream, pa_threaded_mainloop *mainloop)
{
pa_stream_state_t state;
while ((state = pa_stream_get_state(stream)) != PA_STREAM_READY) {
if (state == PA_STREAM_FAILED || state == PA_STREAM_TERMINATED)
return -1;
pa_threaded_mainloop_wait(mainloop);
}
return 0;
}
/*** Sink input ***/
static void sink_input_info_cb(pa_context *ctx, const pa_sink_input_info *i,
int eol, void *userdata)
{
audio_output_t *aout = userdata;
aout_sys_t *sys = aout->sys;
if (eol)
return;
(void) ctx;
sys->cvolume = i->volume; /* cache volume for balance preservation */
VolumeReport(aout);
aout_MuteReport(aout, i->mute);
}
static void sink_input_event(pa_context *ctx,
pa_subscription_event_type_t type,
uint32_t idx, audio_output_t *aout)
{
pa_operation *op;
/* Gee... PA will not provide the infos directly in the event. */
switch (type)
{
case PA_SUBSCRIPTION_EVENT_REMOVE:
msg_Err(aout, "sink input killed!");
break;
default:
op = pa_context_get_sink_input_info(ctx, idx, sink_input_info_cb,
aout);
if (likely(op != NULL))
pa_operation_unref(op);
break;
}
}
/*** Context ***/
static void context_cb(pa_context *ctx, pa_subscription_event_type_t type,
uint32_t idx, void *userdata)
{
audio_output_t *aout = userdata;
aout_sys_t *sys = aout->sys;
unsigned facility = type & PA_SUBSCRIPTION_EVENT_FACILITY_MASK;
type &= PA_SUBSCRIPTION_EVENT_TYPE_MASK;
switch (facility)
{
case PA_SUBSCRIPTION_EVENT_SINK:
sink_event(ctx, type, idx, userdata);
break;
case PA_SUBSCRIPTION_EVENT_SINK_INPUT:
/* only interested in our sink input */
if (sys->stream != NULL && idx == pa_stream_get_index(sys->stream))
sink_input_event(ctx, type, idx, userdata);
break;
default: /* unsubscribed facility?! */
vlc_assert_unreachable();
}
}
/*** VLC audio output callbacks ***/
static int TimeGet(audio_output_t *aout, vlc_tick_t *restrict delay)
{
aout_sys_t *sys = aout->sys;
pa_stream *s = sys->stream;
int ret = -1;
pa_threaded_mainloop_lock(sys->mainloop);
if (pa_stream_is_corked(s) <= 0)
{ /* latency is relevant only if not corked */
vlc_tick_t delta = vlc_pa_get_latency(aout, sys->context, s);
if (delta != VLC_TICK_INVALID)
{
*delay = delta;
ret = 0;
}
}
pa_threaded_mainloop_unlock(sys->mainloop);
return ret;
}
/* Memory free callback. The block_t address is in front of the data. */
static void data_free(void *data)
{
block_t **pp = data, *block;
memcpy(&block, pp - 1, sizeof (block));
block_Release(block);
}
static void *data_convert(block_t **pp)
{
block_t *block = *pp;
/* In most cases, there is enough head room, and this is really cheap: */
block = block_Realloc(block, sizeof (block), block->i_buffer);
*pp = block;
if (unlikely(block == NULL))
return NULL;
memcpy(block->p_buffer, &block, sizeof (block));
block->p_buffer += sizeof (block);
block->i_buffer -= sizeof (block);
return block->p_buffer;
}
/**
* Queue one audio frame to the playback stream
*/
static void Play(audio_output_t *aout, block_t *block, vlc_tick_t date)
{
aout_sys_t *sys = aout->sys;
pa_stream *s = sys->stream;
const void *ptr = data_convert(&block);
if (unlikely(ptr == NULL))
return;
size_t len = block->i_buffer;
/* Note: The core already holds the output FIFO lock at this point.
* Therefore we must not under any circumstances (try to) acquire the
* output FIFO lock while the PulseAudio threaded main loop lock is held
* (including from PulseAudio stream callbacks). Otherwise lock inversion
* will take place, and sooner or later a deadlock. */
pa_threaded_mainloop_lock(sys->mainloop);
sys->last_date = date;
if (pa_stream_is_corked(s) > 0)
stream_start(s, aout, date);
#if 0 /* Fault injector to test underrun recovery */
static volatile unsigned u = 0;
if ((++u % 1000) == 0) {
msg_Err(aout, "fault injection");
pa_operation_unref(pa_stream_flush(s, NULL, NULL));
}
#endif
if (pa_stream_write(s, ptr, len, data_free, 0, PA_SEEK_RELATIVE) < 0) {
vlc_pa_error(aout, "cannot write", sys->context);
block_Release(block);
}
pa_threaded_mainloop_unlock(sys->mainloop);
}
/**
* Cork or uncork the playback stream
*/
static void Pause(audio_output_t *aout, bool paused, vlc_tick_t date)
{
aout_sys_t *sys = aout->sys;
pa_stream *s = sys->stream;
pa_threaded_mainloop_lock(sys->mainloop);
if (paused) {
pa_stream_set_latency_update_callback(s, NULL, NULL);
stream_stop(s, aout);
} else {
pa_stream_set_latency_update_callback(s, stream_latency_cb, aout);
if (likely(sys->last_date != VLC_TICK_INVALID))
stream_start_now(s, aout);
}
pa_threaded_mainloop_unlock(sys->mainloop);
(void) date;
}
/**
* Flush or drain the playback stream
*/
static void Flush(audio_output_t *aout)
{
aout_sys_t *sys = aout->sys;
pa_stream *s = sys->stream;
pa_threaded_mainloop_lock(sys->mainloop);
pa_operation *op = pa_stream_flush(s, NULL, NULL);
if (op != NULL)
pa_operation_unref(op);
sys->last_date = VLC_TICK_INVALID;
stream_stop(s, aout);
pa_threaded_mainloop_unlock(sys->mainloop);
}
static void Drain(audio_output_t *aout)
{
aout_sys_t *sys = aout->sys;
pa_stream *s = sys->stream;
pa_threaded_mainloop_lock(sys->mainloop);
if (unlikely(pa_stream_is_corked(s) > 0))
{
/* Drain while the stream is corked. It happens with very small input
* when the stream is drained while the start is still being deferred.
* In that case, we need start the stream before we actually drain it.
* */
if (sys->trigger != NULL)
{
vlc_pa_rttime_free(sys->mainloop, sys->trigger);
sys->trigger = NULL;
}
stream_start_now(s, aout);
}
pa_operation *op = pa_stream_drain(s, NULL, NULL);
if (op != NULL)
pa_operation_unref(op);
sys->last_date = VLC_TICK_INVALID;
/* XXX: Loosy drain emulation.
* See #18141: drain callback is never received */
vlc_tick_t delay;
if (TimeGet(aout, &delay) == 0 && delay <= VLC_TICK_FROM_SEC(5))
{
pa_threaded_mainloop_unlock(sys->mainloop);
vlc_tick_sleep(delay);
pa_threaded_mainloop_lock(sys->mainloop);
}
stream_stop(s, aout);
pa_threaded_mainloop_unlock(sys->mainloop);
}
static int VolumeSet(audio_output_t *aout, float vol)
{
aout_sys_t *sys = aout->sys;
pa_stream *s = sys->stream;
pa_operation *op;
pa_volume_t volume;
/* VLC provides the software volume so convert directly to PulseAudio
* software volume, pa_volume_t. This is not a linear amplification factor
* so do not use PulseAudio linear amplification! */
vol *= PA_VOLUME_NORM;
if (unlikely(vol >= (float)PA_VOLUME_MAX))
volume = PA_VOLUME_MAX;
else
volume = lroundf(vol);
if (s == NULL)
{
sys->volume_force = volume;
aout_VolumeReport(aout, (float)volume / (float)PA_VOLUME_NORM);
return 0;
}
pa_threaded_mainloop_lock(sys->mainloop);
if (!pa_cvolume_valid(&sys->cvolume))
{
const pa_sample_spec *ss = pa_stream_get_sample_spec(s);
msg_Warn(aout, "balance clobbered by volume change");
pa_cvolume_set(&sys->cvolume, ss->channels, PA_VOLUME_NORM);
}
/* Preserve the balance (VLC does not support it). */
pa_cvolume cvolume = sys->cvolume;
pa_cvolume_scale(&cvolume, PA_VOLUME_NORM);
pa_sw_cvolume_multiply_scalar(&cvolume, &cvolume, volume);
assert(pa_cvolume_valid(&cvolume));
op = pa_context_set_sink_input_volume(sys->context, pa_stream_get_index(s),
&cvolume, NULL, NULL);
if (likely(op != NULL))
pa_operation_unref(op);
pa_threaded_mainloop_unlock(sys->mainloop);
return likely(op != NULL) ? 0 : -1;
}
static int MuteSet(audio_output_t *aout, bool mute)
{
aout_sys_t *sys = aout->sys;
if (sys->stream == NULL)
{
sys->flags_force &= ~(PA_STREAM_START_MUTED|PA_STREAM_START_UNMUTED);
sys->flags_force |=
mute ? PA_STREAM_START_MUTED : PA_STREAM_START_UNMUTED;
aout_MuteReport(aout, mute);
return 0;
}
pa_operation *op;
uint32_t idx = pa_stream_get_index(sys->stream);
pa_threaded_mainloop_lock(sys->mainloop);
op = pa_context_set_sink_input_mute(sys->context, idx, mute, NULL, NULL);
if (likely(op != NULL))
pa_operation_unref(op);
pa_threaded_mainloop_unlock(sys->mainloop);
return 0;
}
static int StreamMove(audio_output_t *aout, const char *name)
{
aout_sys_t *sys = aout->sys;
if (sys->stream == NULL)
{
msg_Dbg(aout, "will connect to sink %s", name);
free(sys->sink_force);
sys->sink_force = strdup(name);
aout_DeviceReport(aout, name);
return 0;
}
pa_operation *op;
uint32_t idx = pa_stream_get_index(sys->stream);
pa_threaded_mainloop_lock(sys->mainloop);
op = pa_context_move_sink_input_by_name(sys->context, idx, name,
NULL, NULL);
if (likely(op != NULL)) {
pa_operation_unref(op);
msg_Dbg(aout, "moving to sink %s", name);
} else
vlc_pa_error(aout, "cannot move sink input", sys->context);
pa_threaded_mainloop_unlock(sys->mainloop);
return (op != NULL) ? 0 : -1;
}
static void Stop(audio_output_t *);
static int strcmp_void(const void *a, const void *b)
{
const char *const *entry = b;
return strcmp(a, *entry);
}
static const char *str_map(const char *key, const char *const table[][2],
size_t n)
{
const char **r = bsearch(key, table, n, sizeof (*table), strcmp_void);
return (r != NULL) ? r[1] : NULL;
}
/**
* Create a PulseAudio playback stream, a.k.a. a sink input.
*/
static int Start(audio_output_t *aout, audio_sample_format_t *restrict fmt)
{
aout_sys_t *sys = aout->sys;
/* Sample format specification */
struct pa_sample_spec ss = { .format = PA_SAMPLE_INVALID };
pa_encoding_t encoding = PA_ENCODING_PCM;
switch (fmt->i_format)
{
case VLC_CODEC_FL64:
fmt->i_format = VLC_CODEC_FL32;
/* fall through */
case VLC_CODEC_FL32:
ss.format = PA_SAMPLE_FLOAT32NE;
break;
case VLC_CODEC_S32N:
ss.format = PA_SAMPLE_S32NE;
break;
case VLC_CODEC_S16N:
ss.format = PA_SAMPLE_S16NE;
break;
case VLC_CODEC_U8:
ss.format = PA_SAMPLE_U8;
break;
case VLC_CODEC_A52:
fmt->i_format = VLC_CODEC_SPDIFL;
fmt->i_bytes_per_frame = 4;
fmt->i_frame_length = 1;
fmt->i_physical_channels = AOUT_CHANS_2_0;
fmt->i_channels = 2;
encoding = PA_ENCODING_AC3_IEC61937;
ss.format = PA_SAMPLE_S16NE;
break;
case VLC_CODEC_EAC3:
fmt->i_format = VLC_CODEC_SPDIFL;
fmt->i_bytes_per_frame = 4;
fmt->i_frame_length = 1;
fmt->i_physical_channels = AOUT_CHANS_2_0;
fmt->i_channels = 2;
encoding = PA_ENCODING_EAC3_IEC61937;
ss.format = PA_SAMPLE_S16NE;
break;
/* case VLC_CODEC_MPGA:
fmt->i_format = VLC_CODEC_SPDIFL FIXME;
encoding = PA_ENCODING_MPEG_IEC61937;
break;*/
case VLC_CODEC_DTS:
fmt->i_format = VLC_CODEC_SPDIFL;
fmt->i_bytes_per_frame = 4;
fmt->i_frame_length = 1;
fmt->i_physical_channels = AOUT_CHANS_2_0;
fmt->i_channels = 2;
encoding = PA_ENCODING_DTS_IEC61937;
ss.format = PA_SAMPLE_S16NE;
break;
default:
if (!AOUT_FMT_LINEAR(fmt) || aout_FormatNbChannels(fmt) == 0)
return VLC_EGENERIC;
if (HAVE_FPU)
{
fmt->i_format = VLC_CODEC_FL32;
ss.format = PA_SAMPLE_FLOAT32NE;
}
else
{
fmt->i_format = VLC_CODEC_S16N;
ss.format = PA_SAMPLE_S16NE;
}
break;
}
ss.rate = fmt->i_rate;
ss.channels = fmt->i_channels;
if (!pa_sample_spec_valid(&ss)) {
msg_Err(aout, "unsupported sample specification");
return VLC_EGENERIC;
}
/* Stream parameters */
pa_stream_flags_t flags = sys->flags_force
| PA_STREAM_START_CORKED
| PA_STREAM_INTERPOLATE_TIMING
| PA_STREAM_NOT_MONOTONIC
| PA_STREAM_AUTO_TIMING_UPDATE
| PA_STREAM_FIX_RATE;
struct pa_buffer_attr attr;
attr.maxlength = -1;
/* PulseAudio goes berserk if the target length (tlength) is not
* significantly longer than 2 periods (minreq), or when the period length
* is unspecified and the target length is short. */
attr.tlength = pa_usec_to_bytes(3 * AOUT_MIN_PREPARE_TIME, &ss);
attr.prebuf = 0; /* trigger manually */
attr.minreq = pa_usec_to_bytes(AOUT_MIN_PREPARE_TIME, &ss);
attr.fragsize = 0; /* not used for output */
pa_cvolume *cvolume = NULL, cvolumebuf;
if (PA_VOLUME_IS_VALID(sys->volume_force))
{
cvolume = &cvolumebuf;
pa_cvolume_set(cvolume, ss.channels, sys->volume_force);
}
sys->trigger = NULL;
pa_cvolume_init(&sys->cvolume);
sys->last_date = VLC_TICK_INVALID;
pa_format_info *formatv = pa_format_info_new();
formatv->encoding = encoding;
pa_format_info_set_rate(formatv, ss.rate);
if (ss.format != PA_SAMPLE_INVALID)
pa_format_info_set_sample_format(formatv, ss.format);
if (fmt->channel_type == AUDIO_CHANNEL_TYPE_AMBISONICS)
{
fmt->channel_type = AUDIO_CHANNEL_TYPE_BITMAP;
/* Setup low latency in order to quickly react to ambisonics
* filters viewpoint changes. */
flags |= PA_STREAM_ADJUST_LATENCY;
attr.tlength = pa_usec_to_bytes(3 * AOUT_MIN_PREPARE_TIME, &ss);
}
if (encoding != PA_ENCODING_PCM)
{
pa_format_info_set_channels(formatv, ss.channels);
/* FIX flags are only permitted for PCM, and there is no way to pass
* different flags for different formats... */
flags &= ~(PA_STREAM_FIX_FORMAT
| PA_STREAM_FIX_RATE
| PA_STREAM_FIX_CHANNELS);
}
else
{
/* Channel mapping (order defined in vlc_aout.h) */
struct pa_channel_map map;
map.channels = 0;
if (fmt->i_physical_channels & AOUT_CHAN_LEFT)
map.map[map.channels++] = PA_CHANNEL_POSITION_FRONT_LEFT;
if (fmt->i_physical_channels & AOUT_CHAN_RIGHT)
map.map[map.channels++] = PA_CHANNEL_POSITION_FRONT_RIGHT;
if (fmt->i_physical_channels & AOUT_CHAN_MIDDLELEFT)
map.map[map.channels++] = PA_CHANNEL_POSITION_SIDE_LEFT;
if (fmt->i_physical_channels & AOUT_CHAN_MIDDLERIGHT)
map.map[map.channels++] = PA_CHANNEL_POSITION_SIDE_RIGHT;
if (fmt->i_physical_channels & AOUT_CHAN_REARLEFT)
map.map[map.channels++] = PA_CHANNEL_POSITION_REAR_LEFT;
if (fmt->i_physical_channels & AOUT_CHAN_REARRIGHT)
map.map[map.channels++] = PA_CHANNEL_POSITION_REAR_RIGHT;
if (fmt->i_physical_channels & AOUT_CHAN_REARCENTER)
map.map[map.channels++] = PA_CHANNEL_POSITION_REAR_CENTER;
if (fmt->i_physical_channels & AOUT_CHAN_CENTER)
{
if (ss.channels == 1)
map.map[map.channels++] = PA_CHANNEL_POSITION_MONO;
else
map.map[map.channels++] = PA_CHANNEL_POSITION_FRONT_CENTER;
}
if (fmt->i_physical_channels & AOUT_CHAN_LFE)
map.map[map.channels++] = PA_CHANNEL_POSITION_LFE;
static_assert(AOUT_CHAN_MAX == 9, "Missing channels");
for (unsigned i = 0; map.channels < ss.channels; i++) {
map.map[map.channels++] = PA_CHANNEL_POSITION_AUX0 + i;
msg_Warn(aout, "mapping channel %"PRIu8" to AUX%u", map.channels, i);
}
if (!pa_channel_map_valid(&map)) {
msg_Err(aout, "unsupported channel map");
return VLC_EGENERIC;
} else {
const char *name = pa_channel_map_to_name(&map);
msg_Dbg(aout, "using %s channel map", (name != NULL) ? name : "?");
}
pa_format_info_set_channels(formatv, ss.channels);
pa_format_info_set_channel_map(formatv, &map);
}
/* Create a playback stream */
pa_proplist *props = pa_proplist_new();
if (likely(props != NULL))
{
/* TODO: set other stream properties */
char *str = var_InheritString(aout, "role");
if (str != NULL)
{
static const char *const role_map[][2] = {
{ "accessibility", "a11y" },
{ "animation", "animation" },
{ "communication", "phone" },
{ "game", "game" },
{ "music", "music" },
{ "notification", "event" },
{ "production", "production" },
{ "test", "test" },
{ "video", "video" },
};
const char *role = str_map(str, role_map, ARRAY_SIZE(role_map));
if (role != NULL)
pa_proplist_sets(props, PA_PROP_MEDIA_ROLE, role);
free(str);
}
}
pa_threaded_mainloop_lock(sys->mainloop);
pa_stream *s = pa_stream_new_extended(sys->context, "audio stream",
&formatv, 1, props);
if (likely(props != NULL))
pa_proplist_free(props);
pa_format_info_free(formatv);
if (s == NULL) {
pa_threaded_mainloop_unlock(sys->mainloop);
vlc_pa_error(aout, "stream creation failure", sys->context);
return VLC_EGENERIC;
}
assert(sys->stream == NULL);
sys->stream = s;
pa_stream_set_state_callback(s, stream_state_cb, sys->mainloop);
pa_stream_set_buffer_attr_callback(s, stream_buffer_attr_cb, aout);
pa_stream_set_event_callback(s, stream_event_cb, aout);
pa_stream_set_latency_update_callback(s, stream_latency_cb, aout);
pa_stream_set_moved_callback(s, stream_moved_cb, aout);
pa_stream_set_overflow_callback(s, stream_overflow_cb, aout);
pa_stream_set_started_callback(s, stream_started_cb, aout);
pa_stream_set_suspended_callback(s, stream_suspended_cb, aout);
pa_stream_set_underflow_callback(s, stream_underflow_cb, aout);
if (pa_stream_connect_playback(s, sys->sink_force, &attr, flags,
cvolume, NULL) < 0
|| stream_wait(s, sys->mainloop)) {
if (encoding != PA_ENCODING_PCM)
vlc_pa_error(aout, "digital pass-through stream connection failure",
sys->context);
else
vlc_pa_error(aout, "stream connection failure", sys->context);
goto fail;
}
sys->volume_force = PA_VOLUME_INVALID;
sys->flags_force = PA_STREAM_NOFLAGS;
free(sys->sink_force);
sys->sink_force = NULL;
if (encoding == PA_ENCODING_PCM)
{
const struct pa_sample_spec *spec = pa_stream_get_sample_spec(s);
fmt->i_rate = spec->rate;
}
stream_buffer_attr_cb(s, aout);
stream_moved_cb(s, aout);
pa_threaded_mainloop_unlock(sys->mainloop);
return VLC_SUCCESS;
fail:
pa_threaded_mainloop_unlock(sys->mainloop);
Stop(aout);
return VLC_EGENERIC;
}
/**
* Removes a PulseAudio playback stream
*/
static void Stop(audio_output_t *aout)
{
aout_sys_t *sys = aout->sys;
pa_stream *s = sys->stream;
pa_threaded_mainloop_lock(sys->mainloop);
if (unlikely(sys->trigger != NULL))
vlc_pa_rttime_free(sys->mainloop, sys->trigger);
pa_stream_disconnect(s);
/* Clear all callbacks */
pa_stream_set_state_callback(s, NULL, NULL);
pa_stream_set_buffer_attr_callback(s, NULL, NULL);
pa_stream_set_event_callback(s, NULL, NULL);
pa_stream_set_latency_update_callback(s, NULL, NULL);
pa_stream_set_moved_callback(s, NULL, NULL);
pa_stream_set_overflow_callback(s, NULL, NULL);
pa_stream_set_started_callback(s, NULL, NULL);
pa_stream_set_suspended_callback(s, NULL, NULL);
pa_stream_set_underflow_callback(s, NULL, NULL);
pa_stream_unref(s);
sys->stream = NULL;
pa_threaded_mainloop_unlock(sys->mainloop);
}
static int Open(vlc_object_t *obj)
{
audio_output_t *aout = (audio_output_t *)obj;
aout_sys_t *sys = malloc(sizeof (*sys));
pa_operation *op;
if (unlikely(sys == NULL))
return VLC_ENOMEM;
/* Allocate structures */
pa_context *ctx = vlc_pa_connect(obj, &sys->mainloop);
if (ctx == NULL)
{
free(sys);
return VLC_EGENERIC;
}
sys->stream = NULL;
sys->context = ctx;
sys->volume_force = PA_VOLUME_INVALID;
sys->flags_force = PA_STREAM_NOFLAGS;
sys->sink_force = NULL;
sys->sinks = NULL;
aout->sys = sys;
aout->start = Start;
aout->stop = Stop;
aout->time_get = TimeGet;
aout->play = Play;
aout->pause = Pause;
aout->flush = Flush;
aout->drain = Drain;
aout->volume_set = VolumeSet;
aout->mute_set = MuteSet;
aout->device_select = StreamMove;
pa_threaded_mainloop_lock(sys->mainloop);
/* Sinks (output devices) list */
op = pa_context_get_sink_info_list(sys->context, sink_add_cb, aout);
if (likely(op != NULL))
{
while (pa_operation_get_state(op) == PA_OPERATION_RUNNING)
pa_threaded_mainloop_wait(sys->mainloop);
pa_operation_unref(op);
}
/* Context events */
const pa_subscription_mask_t mask = PA_SUBSCRIPTION_MASK_SINK
| PA_SUBSCRIPTION_MASK_SINK_INPUT;
pa_context_set_subscribe_callback(sys->context, context_cb, aout);
op = pa_context_subscribe(sys->context, mask, NULL, NULL);
if (likely(op != NULL))
pa_operation_unref(op);
pa_threaded_mainloop_unlock(sys->mainloop);
return VLC_SUCCESS;
}
static void Close(vlc_object_t *obj)
{
audio_output_t *aout = (audio_output_t *)obj;
aout_sys_t *sys = aout->sys;
pa_context *ctx = sys->context;
pa_threaded_mainloop_lock(sys->mainloop);
pa_context_set_subscribe_callback(sys->context, NULL, NULL);
pa_threaded_mainloop_unlock(sys->mainloop);
vlc_pa_disconnect(obj, ctx, sys->mainloop);
for (struct sink *sink = sys->sinks, *next; sink != NULL; sink = next)
{
next = sink->next;
free(sink);
}
free(sys->sink_force);
free(sys);
}