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mpv/libao2/ao_pulse.c

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/*
* PulseAudio audio output driver.
* Copyright (C) 2006 Lennart Poettering
* Copyright (C) 2007 Reimar Doeffinger
*
* This file is part of MPlayer.
*
* MPlayer is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* MPlayer 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <string.h>
#include <pulse/pulseaudio.h>
#include "config.h"
#include "libaf/af_format.h"
#include "mp_msg.h"
#include "audio_out.h"
#include "audio_out_internal.h"
#define PULSE_CLIENT_NAME "MPlayer"
/** General driver info */
static const ao_info_t info = {
"PulseAudio audio output",
"pulse",
"Lennart Poettering",
""
};
/** PulseAudio playback stream object */
static struct pa_stream *stream;
/** PulseAudio connection context */
static struct pa_context *context;
/** Main event loop object */
static struct pa_threaded_mainloop *mainloop;
/** A temporary variable to store the current volume */
static pa_cvolume volume;
static int broken_pause;
LIBAO_EXTERN(pulse)
#define GENERIC_ERR_MSG(ctx, str) \
mp_msg(MSGT_AO, MSGL_ERR, "AO: [pulse] "str": %s\n", \
pa_strerror(pa_context_errno(ctx)))
static void context_state_cb(pa_context *c, void *userdata) {
switch (pa_context_get_state(c)) {
case PA_CONTEXT_READY:
case PA_CONTEXT_TERMINATED:
case PA_CONTEXT_FAILED:
pa_threaded_mainloop_signal(mainloop, 0);
break;
}
}
static void stream_state_cb(pa_stream *s, void *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);
break;
}
}
static void stream_request_cb(pa_stream *s, size_t length, void *userdata) {
pa_threaded_mainloop_signal(mainloop, 0);
}
static void stream_latency_update_cb(pa_stream *s, void *userdata) {
pa_threaded_mainloop_signal(mainloop, 0);
}
static void success_cb(pa_stream *s, int success, void *userdata) {
if (userdata)
*(int *)userdata = success;
pa_threaded_mainloop_signal(mainloop, 0);
}
/**
* \brief waits for a pulseaudio operation to finish, frees it and
* unlocks the mainloop
* \param op operation to wait for
* \return 1 if operation has finished normally (DONE state), 0 otherwise
*/
static int waitop(pa_operation *op) {
pa_operation_state_t state;
if (!op) return 0;
state = pa_operation_get_state(op);
while (state == PA_OPERATION_RUNNING) {
pa_threaded_mainloop_wait(mainloop);
state = pa_operation_get_state(op);
}
pa_operation_unref(op);
pa_threaded_mainloop_unlock(mainloop);
return state == PA_OPERATION_DONE;
}
static const struct format_map_s {
int mp_format;
pa_sample_format_t pa_format;
} format_maps[] = {
{AF_FORMAT_S16_LE, PA_SAMPLE_S16LE},
{AF_FORMAT_S16_BE, PA_SAMPLE_S16BE},
#ifdef PA_SAMPLE_S32NE
{AF_FORMAT_S32_LE, PA_SAMPLE_S32LE},
{AF_FORMAT_S32_BE, PA_SAMPLE_S32BE},
#endif
#ifdef PA_SAMPLE_FLOAT32NE
{AF_FORMAT_FLOAT_LE, PA_SAMPLE_FLOAT32LE},
{AF_FORMAT_FLOAT_BE, PA_SAMPLE_FLOAT32BE},
#endif
{AF_FORMAT_U8, PA_SAMPLE_U8},
{AF_FORMAT_MU_LAW, PA_SAMPLE_ULAW},
{AF_FORMAT_A_LAW, PA_SAMPLE_ALAW},
{AF_FORMAT_UNKNOWN, 0}
};
static int init(int rate_hz, int channels, int format, int flags) {
struct pa_sample_spec ss;
struct pa_channel_map map;
const struct format_map_s *fmt_map;
char *devarg = NULL;
char *host = NULL;
char *sink = NULL;
char *version = pa_get_library_version();
if (ao_subdevice) {
devarg = strdup(ao_subdevice);
sink = strchr(devarg, ':');
if (sink) *sink++ = 0;
if (devarg[0]) host = devarg;
}
broken_pause = 0;
// not sure which versions are affected, assume 0.9.1*
// known bad: 0.9.14, 0.9.13
// known good: 0.9.9, 0.9.10
// to test: pause, wait ca. 5 seconds framestep and see if MPlayer hangs somewhen
if (strncmp(version, "0.9.1", 5) == 0 && strncmp(version, "0.9.10", 6) != 0) {
mp_msg(MSGT_AO, MSGL_WARN, "[pulse] working around probably broken pause functionality,\n"
" see http://www.pulseaudio.org/ticket/440\n");
broken_pause = 1;
}
ss.channels = channels;
ss.rate = rate_hz;
ao_data.samplerate = rate_hz;
ao_data.channels = channels;
fmt_map = format_maps;
while (fmt_map->mp_format != format) {
if (fmt_map->mp_format == AF_FORMAT_UNKNOWN) {
mp_msg(MSGT_AO, MSGL_V, "AO: [pulse] Unsupported format, using default\n");
fmt_map = format_maps;
break;
}
fmt_map++;
}
ao_data.format = fmt_map->mp_format;
ss.format = fmt_map->pa_format;
if (!pa_sample_spec_valid(&ss)) {
mp_msg(MSGT_AO, MSGL_ERR, "AO: [pulse] Invalid sample spec\n");
goto fail;
}
pa_channel_map_init_auto(&map, ss.channels, PA_CHANNEL_MAP_ALSA);
ao_data.bps = pa_bytes_per_second(&ss);
pa_cvolume_reset(&volume, ss.channels);
if (!(mainloop = pa_threaded_mainloop_new())) {
mp_msg(MSGT_AO, MSGL_ERR, "AO: [pulse] Failed to allocate main loop\n");
goto fail;
}
if (!(context = pa_context_new(pa_threaded_mainloop_get_api(mainloop), PULSE_CLIENT_NAME))) {
mp_msg(MSGT_AO, MSGL_ERR, "AO: [pulse] Failed to allocate context\n");
goto fail;
}
pa_context_set_state_callback(context, context_state_cb, NULL);
if (pa_context_connect(context, host, 0, NULL) < 0)
goto fail;
pa_threaded_mainloop_lock(mainloop);
if (pa_threaded_mainloop_start(mainloop) < 0)
goto unlock_and_fail;
/* Wait until the context is ready */
pa_threaded_mainloop_wait(mainloop);
if (pa_context_get_state(context) != PA_CONTEXT_READY)
goto unlock_and_fail;
if (!(stream = pa_stream_new(context, "audio stream", &ss, &map)))
goto unlock_and_fail;
pa_stream_set_state_callback(stream, stream_state_cb, NULL);
pa_stream_set_write_callback(stream, stream_request_cb, NULL);
pa_stream_set_latency_update_callback(stream, stream_latency_update_cb, NULL);
if (pa_stream_connect_playback(stream, sink, NULL, PA_STREAM_INTERPOLATE_TIMING|PA_STREAM_AUTO_TIMING_UPDATE, &volume, NULL) < 0)
goto unlock_and_fail;
/* Wait until the stream is ready */
pa_threaded_mainloop_wait(mainloop);
if (pa_stream_get_state(stream) != PA_STREAM_READY)
goto unlock_and_fail;
pa_threaded_mainloop_unlock(mainloop);
free(devarg);
return 1;
unlock_and_fail:
if (mainloop)
pa_threaded_mainloop_unlock(mainloop);
fail:
if (context)
GENERIC_ERR_MSG(context, "Init failed");
free(devarg);
uninit(1);
return 0;
}
/** Destroy libao driver */
static void uninit(int immed) {
if (stream && !immed) {
pa_threaded_mainloop_lock(mainloop);
waitop(pa_stream_drain(stream, success_cb, NULL));
}
if (mainloop)
pa_threaded_mainloop_stop(mainloop);
if (stream) {
pa_stream_disconnect(stream);
pa_stream_unref(stream);
stream = NULL;
}
if (context) {
pa_context_disconnect(context);
pa_context_unref(context);
context = NULL;
}
if (mainloop) {
pa_threaded_mainloop_free(mainloop);
mainloop = NULL;
}
}
/** Play the specified data to the pulseaudio server */
static int play(void* data, int len, int flags) {
pa_threaded_mainloop_lock(mainloop);
if (pa_stream_write(stream, data, len, NULL, 0, PA_SEEK_RELATIVE) < 0) {
GENERIC_ERR_MSG(context, "pa_stream_write() failed");
len = -1;
}
pa_threaded_mainloop_unlock(mainloop);
return len;
}
static void cork(int b) {
int success = 0;
pa_threaded_mainloop_lock(mainloop);
if (!waitop(pa_stream_cork(stream, b, success_cb, &success)) ||
!success)
GENERIC_ERR_MSG(context, "pa_stream_cork() failed");
}
/** Pause the audio stream by corking it on the server */
static void audio_pause(void) {
cork(1);
}
/** Resume the audio stream by uncorking it on the server */
static void audio_resume(void) {
// without this, certain versions will cause an infinite hang because
// pa_stream_writable_size returns 0 always.
// Note that this workaround causes A-V desync after pause
if (broken_pause) reset();
cork(0);
}
/** Reset the audio stream, i.e. flush the playback buffer on the server side */
static void reset(void) {
int success = 0;
pa_threaded_mainloop_lock(mainloop);
if (!waitop(pa_stream_flush(stream, success_cb, &success)) ||
!success)
GENERIC_ERR_MSG(context, "pa_stream_flush() failed");
}
/** Return number of bytes that may be written to the server without blocking */
static int get_space(void) {
size_t l;
pa_threaded_mainloop_lock(mainloop);
l = pa_stream_writable_size(stream);
pa_threaded_mainloop_unlock(mainloop);
return l;
}
/** Return the current latency in seconds */
static float get_delay(void) {
pa_usec_t latency = (pa_usec_t) -1;
pa_threaded_mainloop_lock(mainloop);
while (pa_stream_get_latency(stream, &latency, NULL) < 0) {
if (pa_context_errno(context) != PA_ERR_NODATA) {
GENERIC_ERR_MSG(context, "pa_stream_get_latency() failed");
break;
}
/* Wait until latency data is available again */
pa_threaded_mainloop_wait(mainloop);
}
pa_threaded_mainloop_unlock(mainloop);
return latency == (pa_usec_t) -1 ? 0 : latency / 1000000.0;
}
/** A callback function that is called when the
* pa_context_get_sink_input_info() operation completes. Saves the
* volume field of the specified structure to the global variable volume. */
static void info_func(struct pa_context *c, const struct pa_sink_input_info *i, int is_last, void *userdata) {
if (is_last < 0) {
GENERIC_ERR_MSG(context, "Failed to get sink input info");
return;
}
if (!i)
return;
volume = i->volume;
pa_threaded_mainloop_signal(mainloop, 0);
}
static int control(int cmd, void *arg) {
switch (cmd) {
case AOCONTROL_GET_VOLUME: {
ao_control_vol_t *vol = arg;
uint32_t devidx = pa_stream_get_index(stream);
pa_threaded_mainloop_lock(mainloop);
if (!waitop(pa_context_get_sink_input_info(context, devidx, info_func, NULL))) {
GENERIC_ERR_MSG(context, "pa_stream_get_sink_input_info() failed");
return CONTROL_ERROR;
}
if (volume.channels != 2)
vol->left = vol->right = pa_cvolume_avg(&volume)*100/PA_VOLUME_NORM;
else {
vol->left = volume.values[0]*100/PA_VOLUME_NORM;
vol->right = volume.values[1]*100/PA_VOLUME_NORM;
}
return CONTROL_OK;
}
case AOCONTROL_SET_VOLUME: {
const ao_control_vol_t *vol = arg;
pa_operation *o;
if (volume.channels != 2)
pa_cvolume_set(&volume, volume.channels, (pa_volume_t)vol->left*PA_VOLUME_NORM/100);
else {
volume.values[0] = (pa_volume_t)vol->left*PA_VOLUME_NORM/100;
volume.values[1] = (pa_volume_t)vol->right*PA_VOLUME_NORM/100;
}
if (!(o = pa_context_set_sink_input_volume(context, pa_stream_get_index(stream), &volume, NULL, NULL))) {
GENERIC_ERR_MSG(context, "pa_context_set_sink_input_volume() failed");
return CONTROL_ERROR;
}
/* We don't wait for completion here */
pa_operation_unref(o);
return CONTROL_OK;
}
default:
return CONTROL_UNKNOWN;
}
}
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