From 4fed8ad19771f6c3cfdd01414ba11456007fd9b8 Mon Sep 17 00:00:00 2001 From: Uoti Urpala Date: Sat, 24 Mar 2012 17:28:38 +0200 Subject: [PATCH] ao_pulse: convert to new AO API --- libao2/ao_pulse.c | 880 +++++++++++++++++++++++++++++------------------------- 1 file changed, 470 insertions(+), 410 deletions(-) rewrite libao2/ao_pulse.c (67%) diff --git a/libao2/ao_pulse.c b/libao2/ao_pulse.c dissimilarity index 67% index a07bf31da0..659a2bc907 100644 --- a/libao2/ao_pulse.c +++ b/libao2/ao_pulse.c @@ -1,410 +1,470 @@ -/* - * 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 - -#include - -#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; - -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) { - pa_threaded_mainloop_unlock(mainloop); - 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; - const 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 0.9.11* to 0.9.14* - // known bad: 0.9.14, 0.9.13 - // known good: 0.9.9, 0.9.10, 0.9.15 - // to test: pause, wait ca. 5 seconds framestep and see if MPlayer hangs somewhen - if (strncmp(version, "0.9.1", 5) == 0 && version[5] >= '1' && version[5] <= '4') { - 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); - - 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, NULL, 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) { - struct pa_cvolume *volume = 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); - struct pa_cvolume volume; - pa_threaded_mainloop_lock(mainloop); - if (!waitop(pa_context_get_sink_input_info(context, devidx, info_func, &volume))) { - 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; - struct pa_cvolume volume; - - pa_cvolume_reset(&volume, ao_data.channels); - 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; - } - - pa_threaded_mainloop_lock(mainloop); - o = pa_context_set_sink_input_volume(context, pa_stream_get_index(stream), &volume, NULL, NULL); - if (!o) { - pa_threaded_mainloop_unlock(mainloop); - 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); - pa_threaded_mainloop_unlock(mainloop); - return CONTROL_OK; - } - - default: - return CONTROL_UNKNOWN; - } -} +/* + * 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 +#include +#include + +#include + +#include "config.h" +#include "libaf/af_format.h" +#include "mp_msg.h" +#include "audio_out.h" + +#define PULSE_CLIENT_NAME "mplayer2" + + +struct priv { + // PulseAudio playback stream object + struct pa_stream *stream; + + // PulseAudio connection context + struct pa_context *context; + + // Main event loop object + struct pa_threaded_mainloop *mainloop; + + struct pa_cvolume volume; + + bool broken_pause; + int retval; +}; + +#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) +{ + struct ao *ao = userdata; + struct priv *priv = ao->priv; + switch (pa_context_get_state(c)) { + case PA_CONTEXT_READY: + case PA_CONTEXT_TERMINATED: + case PA_CONTEXT_FAILED: + pa_threaded_mainloop_signal(priv->mainloop, 0); + break; + } +} + +static void stream_state_cb(pa_stream *s, void *userdata) +{ + struct ao *ao = userdata; + struct priv *priv = ao->priv; + switch (pa_stream_get_state(s)) { + case PA_STREAM_READY: + case PA_STREAM_FAILED: + case PA_STREAM_TERMINATED: + pa_threaded_mainloop_signal(priv->mainloop, 0); + break; + } +} + +static void stream_request_cb(pa_stream *s, size_t length, void *userdata) +{ + struct ao *ao = userdata; + struct priv *priv = ao->priv; + pa_threaded_mainloop_signal(priv->mainloop, 0); +} + +static void stream_latency_update_cb(pa_stream *s, void *userdata) +{ + struct ao *ao = userdata; + struct priv *priv = ao->priv; + pa_threaded_mainloop_signal(priv->mainloop, 0); +} + +static void success_cb(pa_stream *s, int success, void *userdata) +{ + struct ao *ao = userdata; + struct priv *priv = ao->priv; + priv->retval = success; + pa_threaded_mainloop_signal(priv->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(struct priv *priv, pa_operation *op) +{ + if (!op) { + pa_threaded_mainloop_unlock(priv->mainloop); + return 0; + } + pa_operation_state_t state = pa_operation_get_state(op); + while (state == PA_OPERATION_RUNNING) { + pa_threaded_mainloop_wait(priv->mainloop); + state = pa_operation_get_state(op); + } + pa_operation_unref(op); + pa_threaded_mainloop_unlock(priv->mainloop); + return state == PA_OPERATION_DONE; +} + +static const struct format_map { + 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}, + {AF_FORMAT_S32_LE, PA_SAMPLE_S32LE}, + {AF_FORMAT_S32_BE, PA_SAMPLE_S32BE}, + {AF_FORMAT_FLOAT_LE, PA_SAMPLE_FLOAT32LE}, + {AF_FORMAT_FLOAT_BE, PA_SAMPLE_FLOAT32BE}, + {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 void uninit(struct ao *ao, bool cut_audio) +{ + struct priv *priv = ao->priv; + if (priv->stream && !cut_audio) { + pa_threaded_mainloop_lock(priv->mainloop); + waitop(priv, pa_stream_drain(priv->stream, success_cb, ao)); + } + + if (priv->mainloop) + pa_threaded_mainloop_stop(priv->mainloop); + + if (priv->stream) { + pa_stream_disconnect(priv->stream); + pa_stream_unref(priv->stream); + priv->stream = NULL; + } + + if (priv->context) { + pa_context_disconnect(priv->context); + pa_context_unref(priv->context); + priv->context = NULL; + } + + if (priv->mainloop) { + pa_threaded_mainloop_free(priv->mainloop); + priv->mainloop = NULL; + } +} + +static int init(struct ao *ao, char *params) +{ + struct pa_sample_spec ss; + struct pa_channel_map map; + char *devarg = NULL; + char *host = NULL; + char *sink = NULL; + const char *version = pa_get_library_version(); + + struct priv *priv = talloc_zero(ao, struct priv); + ao->priv = priv; + + if (params) { + devarg = strdup(ao_subdevice); + sink = strchr(devarg, ':'); + if (sink) + *sink++ = 0; + if (devarg[0]) + host = devarg; + } + + priv->broken_pause = false; + /* not sure which versions are affected, assume 0.9.11* to 0.9.14* + * known bad: 0.9.14, 0.9.13 + * known good: 0.9.9, 0.9.10, 0.9.15 + * To test: pause, wait ca. 5 seconds, framestep and see if MPlayer + * hangs somewhen. */ + if (strncmp(version, "0.9.1", 5) == 0 && version[5] >= '1' + && version[5] <= '4') { + mp_msg(MSGT_AO, MSGL_WARN, + "[pulse] working around probably broken pause functionality,\n" + " see http://www.pulseaudio.org/ticket/440\n"); + priv->broken_pause = true; + } + + ss.channels = ao->channels; + ss.rate = ao->samplerate; + + const struct format_map *fmt_map = format_maps; + while (fmt_map->mp_format != ao->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->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->bps = pa_bytes_per_second(&ss); + + if (!(priv->mainloop = pa_threaded_mainloop_new())) { + mp_msg(MSGT_AO, MSGL_ERR, "AO: [pulse] Failed to allocate main loop\n"); + goto fail; + } + + if (!(priv->context = pa_context_new(pa_threaded_mainloop_get_api( + priv->mainloop), PULSE_CLIENT_NAME))) { + mp_msg(MSGT_AO, MSGL_ERR, "AO: [pulse] Failed to allocate context\n"); + goto fail; + } + + pa_context_set_state_callback(priv->context, context_state_cb, ao); + + if (pa_context_connect(priv->context, host, 0, NULL) < 0) + goto fail; + + pa_threaded_mainloop_lock(priv->mainloop); + + if (pa_threaded_mainloop_start(priv->mainloop) < 0) + goto unlock_and_fail; + + /* Wait until the context is ready */ + pa_threaded_mainloop_wait(priv->mainloop); + + if (pa_context_get_state(priv->context) != PA_CONTEXT_READY) + goto unlock_and_fail; + + if (!(priv->stream = pa_stream_new(priv->context, "audio stream", &ss, + &map))) + goto unlock_and_fail; + + pa_stream_set_state_callback(priv->stream, stream_state_cb, ao); + pa_stream_set_write_callback(priv->stream, stream_request_cb, ao); + pa_stream_set_latency_update_callback(priv->stream, + stream_latency_update_cb, ao); + + if (pa_stream_connect_playback(priv->stream, sink, NULL, + PA_STREAM_INTERPOLATE_TIMING + | PA_STREAM_AUTO_TIMING_UPDATE, NULL, + NULL) < 0) + goto unlock_and_fail; + + /* Wait until the stream is ready */ + pa_threaded_mainloop_wait(priv->mainloop); + + if (pa_stream_get_state(priv->stream) != PA_STREAM_READY) + goto unlock_and_fail; + + pa_threaded_mainloop_unlock(priv->mainloop); + + free(devarg); + return 0; + +unlock_and_fail: + + if (priv->mainloop) + pa_threaded_mainloop_unlock(priv->mainloop); + +fail: + if (priv->context) + GENERIC_ERR_MSG(priv->context, "Init failed"); + free(devarg); + uninit(ao, true); + return -1; +} + +static void cork(struct ao *ao, bool pause) +{ + struct priv *priv = ao->priv; + pa_threaded_mainloop_lock(priv->mainloop); + priv->retval = 0; + if (!waitop(priv, pa_stream_cork(priv->stream, pause, success_cb, ao)) || + !priv->retval) + GENERIC_ERR_MSG(priv->context, "pa_stream_cork() failed"); +} + +// Play the specified data to the pulseaudio server +static int play(struct ao *ao, void *data, int len, int flags) +{ + struct priv *priv = ao->priv; + pa_threaded_mainloop_lock(priv->mainloop); + if (pa_stream_write(priv->stream, data, len, NULL, 0, + PA_SEEK_RELATIVE) < 0) { + GENERIC_ERR_MSG(priv->context, "pa_stream_write() failed"); + len = -1; + } + pa_threaded_mainloop_unlock(priv->mainloop); + return len; +} + +// Reset the audio stream, i.e. flush the playback buffer on the server side +static void reset(struct ao *ao) +{ + struct priv *priv = ao->priv; + pa_threaded_mainloop_lock(priv->mainloop); + priv->retval = 0; + if (!waitop(priv, pa_stream_flush(priv->stream, success_cb, ao)) || + !priv->retval) + GENERIC_ERR_MSG(priv->context, "pa_stream_flush() failed"); +} + +// Pause the audio stream by corking it on the server +static void pause(struct ao *ao) +{ + cork(ao, true); +} + +// Resume the audio stream by uncorking it on the server +static void resume(struct ao *ao) +{ + struct priv *priv = ao->priv; + /* 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 (priv->broken_pause) + reset(ao); + cork(ao, false); +} + +// Return number of bytes that may be written to the server without blocking +static int get_space(struct ao *ao) +{ + struct priv *priv = ao->priv; + pa_threaded_mainloop_lock(priv->mainloop); + size_t space = pa_stream_writable_size(priv->stream); + pa_threaded_mainloop_unlock(priv->mainloop); + return space; +} + +// Return the current latency in seconds +static float get_delay(struct ao *ao) +{ + struct priv *priv = ao->priv; + pa_usec_t latency = (pa_usec_t) -1; + pa_threaded_mainloop_lock(priv->mainloop); + while (pa_stream_get_latency(priv->stream, &latency, NULL) < 0) { + if (pa_context_errno(priv->context) != PA_ERR_NODATA) { + GENERIC_ERR_MSG(priv->context, "pa_stream_get_latency() failed"); + break; + } + /* Wait until latency data is available again */ + pa_threaded_mainloop_wait(priv->mainloop); + } + pa_threaded_mainloop_unlock(priv->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) +{ + struct ao *ao = userdata; + struct priv *priv = ao->priv; + if (is_last < 0) { + GENERIC_ERR_MSG(priv->context, "Failed to get sink input info"); + return; + } + if (!i) + return; + priv->volume = i->volume; + pa_threaded_mainloop_signal(priv->mainloop, 0); +} + +static int control(struct ao *ao, int cmd, void *arg) +{ + struct priv *priv = ao->priv; + switch (cmd) { + case AOCONTROL_GET_VOLUME: { + ao_control_vol_t *vol = arg; + uint32_t devidx = pa_stream_get_index(priv->stream); + pa_threaded_mainloop_lock(priv->mainloop); + if (!waitop(priv, pa_context_get_sink_input_info(priv->context, devidx, + info_func, ao))) { + GENERIC_ERR_MSG(priv->context, + "pa_stream_get_sink_input_info() failed"); + return CONTROL_ERROR; + } + if (priv->volume.channels != 2) + vol->left = vol->right = + pa_cvolume_avg(&priv->volume) * 100 / PA_VOLUME_NORM; + else { + vol->left = priv->volume.values[0] * 100 / PA_VOLUME_NORM; + vol->right = priv->volume.values[1] * 100 / PA_VOLUME_NORM; + } + return CONTROL_OK; + } + case AOCONTROL_SET_VOLUME: { + const ao_control_vol_t *vol = arg; + pa_operation *o; + struct pa_cvolume volume; + + pa_cvolume_reset(&volume, ao->channels); + if (volume.channels != 2) + pa_cvolume_set(&volume, volume.channels, + (pa_volume_t)vol->left*PA_VOLUME_NORM/100); + else { + volume.values[0] = vol->left * PA_VOLUME_NORM / 100; + volume.values[1] = vol->right * PA_VOLUME_NORM / 100; + } + pa_threaded_mainloop_lock(priv->mainloop); + o = pa_context_set_sink_input_volume(priv->context, + pa_stream_get_index(priv->stream), + &volume, NULL, NULL); + if (!o) { + pa_threaded_mainloop_unlock(priv->mainloop); + GENERIC_ERR_MSG(priv->context, + "pa_context_set_sink_input_volume() failed"); + return CONTROL_ERROR; + } + /* We don't wait for completion here */ + pa_operation_unref(o); + pa_threaded_mainloop_unlock(priv->mainloop); + return CONTROL_OK; + } + default: + return CONTROL_UNKNOWN; + } +} + +const struct ao_driver audio_out_pulse = { + .is_new = true, + .info = &(const struct ao_info) { + "PulseAudio audio output", + "pulse", + "Lennart Poettering", + "", + }, + .control = control, + .init = init, + .uninit = uninit, + .reset = reset, + .get_space = get_space, + .play = play, + .get_delay = get_delay, + .pause = pause, + .resume = resume, +}; -- 2.11.4.GIT