ffmpeg/libavdevice/pulse_audio_enc.c

   1 /*
   2  * Copyright (c) 2013 Lukasz Marek <lukasz.m.luki@gmail.com>
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include <math.h>
  22 #include <pulse/pulseaudio.h>
  23 #include <pulse/error.h>
  24 #include "libavformat/avformat.h"
  25 #include "libavformat/internal.h"
  26 #include "libavutil/opt.h"
  27 #include "libavutil/time.h"
  28 #include "libavutil/log.h"
  29 #include "libavutil/attributes.h"
  30 #include "pulse_audio_common.h"
  31
  32 typedef struct PulseData {
  33     AVClass *class;
  34     const char *server;
  35     const char *name;
  36     const char *stream_name;
  37     const char *device;
  38     int64_t timestamp;
  39     int buffer_size;               /**< Buffer size in bytes */
  40     int buffer_duration;           /**< Buffer size in ms, recalculated to buffer_size */
  41     int prebuf;
  42     int minreq;
  43     int last_result;
  44     pa_threaded_mainloop *mainloop;
  45     pa_context *ctx;
  46     pa_stream *stream;
  47     int nonblocking;
  48     int mute;
  49     pa_volume_t base_volume;
  50     pa_volume_t last_volume;
  51 } PulseData;
  52
  53 static void pulse_audio_sink_device_cb(pa_context *ctx, const pa_sink_info *dev,
  54                                        int eol, void *userdata)
  55 {
  56     PulseData *s = userdata;
  57
  58     if (s->ctx != ctx)
  59         return;
  60
  61     if (eol) {
  62         pa_threaded_mainloop_signal(s->mainloop, 0);
  63     } else {
  64         if (dev->flags & PA_SINK_FLAT_VOLUME)
  65             s->base_volume = dev->base_volume;
  66         else
  67             s->base_volume = PA_VOLUME_NORM;
  68         av_log(s, AV_LOG_DEBUG, "base volume: %u\n", s->base_volume);
  69     }
  70 }
  71
  72 /* Mainloop must be locked before calling this function as it uses pa_threaded_mainloop_wait. */
  73 static int pulse_update_sink_info(AVFormatContext *h)
  74 {
  75     PulseData *s = h->priv_data;
  76     pa_operation *op;
  77     if (!(op = pa_context_get_sink_info_by_name(s->ctx, s->device,
  78                                                 pulse_audio_sink_device_cb, s))) {
  79         av_log(s, AV_LOG_ERROR, "pa_context_get_sink_info_by_name failed.\n");
  80         return AVERROR_EXTERNAL;
  81     }
  82     while (pa_operation_get_state(op) == PA_OPERATION_RUNNING)
  83         pa_threaded_mainloop_wait(s->mainloop);
  84     pa_operation_unref(op);
  85     return 0;
  86 }
  87
  88 static void pulse_audio_sink_input_cb(pa_context *ctx, const pa_sink_input_info *i,
  89                                       int eol, void *userdata)
  90 {
  91     AVFormatContext *h = userdata;
  92     PulseData *s = h->priv_data;
  93
  94     if (s->ctx != ctx)
  95         return;
  96
  97     if (!eol) {
  98         double val;
  99         pa_volume_t vol = pa_cvolume_avg(&i->volume);
 100         if (s->mute < 0 || (s->mute && !i->mute) || (!s->mute && i->mute)) {
 101             s->mute = i->mute;
 102             avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_MUTE_STATE_CHANGED, &s->mute, sizeof(s->mute));
 103         }
 104
 105         vol = pa_sw_volume_divide(vol, s->base_volume);
 106         if (s->last_volume != vol) {
 107             val = (double)vol / PA_VOLUME_NORM;
 108             avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_VOLUME_LEVEL_CHANGED, &val, sizeof(val));
 109             s->last_volume = vol;
 110         }
 111     }
 112 }
 113
 114 /* This function creates new loop so may be called from PA callbacks.
 115    Mainloop must be locked before calling this function as it operates on streams. */
 116 static int pulse_update_sink_input_info(AVFormatContext *h)
 117 {
 118     PulseData *s = h->priv_data;
 119     pa_operation *op;
 120     enum pa_operation_state op_state;
 121     pa_mainloop *ml = NULL;
 122     pa_context *ctx = NULL;
 123     int ret = 0;
 124
 125     if ((ret = ff_pulse_audio_connect_context(&ml, &ctx, s->server, "Update sink input information")) < 0)
 126         return ret;
 127
 128     if (!(op = pa_context_get_sink_input_info(ctx, pa_stream_get_index(s->stream),
 129                                               pulse_audio_sink_input_cb, h))) {
 130         ret = AVERROR_EXTERNAL;
 131         goto fail;
 132     }
 133
 134     while ((op_state = pa_operation_get_state(op)) == PA_OPERATION_RUNNING)
 135         pa_mainloop_iterate(ml, 1, NULL);
 136     pa_operation_unref(op);
 137     if (op_state != PA_OPERATION_DONE) {
 138         ret = AVERROR_EXTERNAL;
 139         goto fail;
 140     }
 141
 142   fail:
 143     ff_pulse_audio_disconnect_context(&ml, &ctx);
 144     if (ret)
 145         av_log(s, AV_LOG_ERROR, "pa_context_get_sink_input_info failed.\n");
 146     return ret;
 147 }
 148
 149 static void pulse_event(pa_context *ctx, pa_subscription_event_type_t t,
 150                         uint32_t idx, void *userdata)
 151 {
 152     AVFormatContext *h = userdata;
 153     PulseData *s = h->priv_data;
 154
 155     if (s->ctx != ctx)
 156         return;
 157
 158     if ((t & PA_SUBSCRIPTION_EVENT_FACILITY_MASK) == PA_SUBSCRIPTION_EVENT_SINK_INPUT) {
 159         if ((t & PA_SUBSCRIPTION_EVENT_TYPE_MASK) == PA_SUBSCRIPTION_EVENT_CHANGE)
 160             // Calling from mainloop callback. No need to lock mainloop.
 161             pulse_update_sink_input_info(h);
 162     }
 163 }
 164
 165 static void pulse_stream_writable(pa_stream *stream, size_t nbytes, void *userdata)
 166 {
 167     AVFormatContext *h = userdata;
 168     PulseData *s = h->priv_data;
 169     int64_t val = nbytes;
 170
 171     if (stream != s->stream)
 172         return;
 173
 174     avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_BUFFER_WRITABLE, &val, sizeof(val));
 175     pa_threaded_mainloop_signal(s->mainloop, 0);
 176 }
 177
 178 static void pulse_overflow(pa_stream *stream, void *userdata)
 179 {
 180     AVFormatContext *h = userdata;
 181     avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_BUFFER_OVERFLOW, NULL, 0);
 182 }
 183
 184 static void pulse_underflow(pa_stream *stream, void *userdata)
 185 {
 186     AVFormatContext *h = userdata;
 187     avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_BUFFER_UNDERFLOW, NULL, 0);
 188 }
 189
 190 static void pulse_stream_state(pa_stream *stream, void *userdata)
 191 {
 192     PulseData *s = userdata;
 193
 194     if (stream != s->stream)
 195         return;
 196
 197     switch (pa_stream_get_state(s->stream)) {
 198         case PA_STREAM_READY:
 199         case PA_STREAM_FAILED:
 200         case PA_STREAM_TERMINATED:
 201             pa_threaded_mainloop_signal(s->mainloop, 0);
 202         default:
 203             break;
 204     }
 205 }
 206
 207 static int pulse_stream_wait(PulseData *s)
 208 {
 209     pa_stream_state_t state;
 210
 211     while ((state = pa_stream_get_state(s->stream)) != PA_STREAM_READY) {
 212         if (state == PA_STREAM_FAILED || state == PA_STREAM_TERMINATED)
 213             return AVERROR_EXTERNAL;
 214         pa_threaded_mainloop_wait(s->mainloop);
 215     }
 216     return 0;
 217 }
 218
 219 static void pulse_context_state(pa_context *ctx, void *userdata)
 220 {
 221     PulseData *s = userdata;
 222
 223     if (s->ctx != ctx)
 224         return;
 225
 226     switch (pa_context_get_state(ctx)) {
 227         case PA_CONTEXT_READY:
 228         case PA_CONTEXT_FAILED:
 229         case PA_CONTEXT_TERMINATED:
 230             pa_threaded_mainloop_signal(s->mainloop, 0);
 231         default:
 232             break;
 233     }
 234 }
 235
 236 static int pulse_context_wait(PulseData *s)
 237 {
 238     pa_context_state_t state;
 239
 240     while ((state = pa_context_get_state(s->ctx)) != PA_CONTEXT_READY) {
 241         if (state == PA_CONTEXT_FAILED || state == PA_CONTEXT_TERMINATED)
 242             return AVERROR_EXTERNAL;
 243         pa_threaded_mainloop_wait(s->mainloop);
 244     }
 245     return 0;
 246 }
 247
 248 static void pulse_stream_result(pa_stream *stream, int success, void *userdata)
 249 {
 250     PulseData *s = userdata;
 251
 252     if (stream != s->stream)
 253         return;
 254
 255     s->last_result = success ? 0 : AVERROR_EXTERNAL;
 256     pa_threaded_mainloop_signal(s->mainloop, 0);
 257 }
 258
 259 static int pulse_finish_stream_operation(PulseData *s, pa_operation *op, const char *name)
 260 {
 261     if (!op) {
 262         pa_threaded_mainloop_unlock(s->mainloop);
 263         av_log(s, AV_LOG_ERROR, "%s failed.\n", name);
 264         return AVERROR_EXTERNAL;
 265     }
 266     s->last_result = 2;
 267     while (s->last_result == 2)
 268         pa_threaded_mainloop_wait(s->mainloop);
 269     pa_operation_unref(op);
 270     pa_threaded_mainloop_unlock(s->mainloop);
 271     if (s->last_result != 0)
 272         av_log(s, AV_LOG_ERROR, "%s failed.\n", name);
 273     return s->last_result;
 274 }
 275
 276 static int pulse_set_pause(PulseData *s, int pause)
 277 {
 278     pa_operation *op;
 279     pa_threaded_mainloop_lock(s->mainloop);
 280     op = pa_stream_cork(s->stream, pause, pulse_stream_result, s);
 281     return pulse_finish_stream_operation(s, op, "pa_stream_cork");
 282 }
 283
 284 static int pulse_flash_stream(PulseData *s)
 285 {
 286     pa_operation *op;
 287     pa_threaded_mainloop_lock(s->mainloop);
 288     op = pa_stream_flush(s->stream, pulse_stream_result, s);
 289     return pulse_finish_stream_operation(s, op, "pa_stream_flush");
 290 }
 291
 292 static void pulse_context_result(pa_context *ctx, int success, void *userdata)
 293 {
 294     PulseData *s = userdata;
 295
 296     if (s->ctx != ctx)
 297         return;
 298
 299     s->last_result = success ? 0 : AVERROR_EXTERNAL;
 300     pa_threaded_mainloop_signal(s->mainloop, 0);
 301 }
 302
 303 static int pulse_finish_context_operation(PulseData *s, pa_operation *op, const char *name)
 304 {
 305     if (!op) {
 306         pa_threaded_mainloop_unlock(s->mainloop);
 307         av_log(s, AV_LOG_ERROR, "%s failed.\n", name);
 308         return AVERROR_EXTERNAL;
 309     }
 310     s->last_result = 2;
 311     while (s->last_result == 2)
 312         pa_threaded_mainloop_wait(s->mainloop);
 313     pa_operation_unref(op);
 314     pa_threaded_mainloop_unlock(s->mainloop);
 315     if (s->last_result != 0)
 316         av_log(s, AV_LOG_ERROR, "%s failed.\n", name);
 317     return s->last_result;
 318 }
 319
 320 static int pulse_set_mute(PulseData *s)
 321 {
 322     pa_operation *op;
 323     pa_threaded_mainloop_lock(s->mainloop);
 324     op = pa_context_set_sink_input_mute(s->ctx, pa_stream_get_index(s->stream),
 325                                         s->mute, pulse_context_result, s);
 326     return pulse_finish_context_operation(s, op, "pa_context_set_sink_input_mute");
 327 }
 328
 329 static int pulse_set_volume(PulseData *s, double volume)
 330 {
 331     pa_operation *op;
 332     pa_cvolume cvol;
 333     pa_volume_t vol;
 334     const pa_sample_spec *ss = pa_stream_get_sample_spec(s->stream);
 335
 336     vol = pa_sw_volume_multiply(lround(volume * PA_VOLUME_NORM), s->base_volume);
 337     pa_cvolume_set(&cvol, ss->channels, PA_VOLUME_NORM);
 338     pa_sw_cvolume_multiply_scalar(&cvol, &cvol, vol);
 339     pa_threaded_mainloop_lock(s->mainloop);
 340     op = pa_context_set_sink_input_volume(s->ctx, pa_stream_get_index(s->stream),
 341                                           &cvol, pulse_context_result, s);
 342     return pulse_finish_context_operation(s, op, "pa_context_set_sink_input_volume");
 343 }
 344
 345 static int pulse_subscribe_events(PulseData *s)
 346 {
 347     pa_operation *op;
 348
 349     pa_threaded_mainloop_lock(s->mainloop);
 350     op = pa_context_subscribe(s->ctx, PA_SUBSCRIPTION_MASK_SINK_INPUT, pulse_context_result, s);
 351     return pulse_finish_context_operation(s, op, "pa_context_subscribe");
 352 }
 353
 354 static void pulse_map_channels_to_pulse(int64_t channel_layout, pa_channel_map *channel_map)
 355 {
 356     channel_map->channels = 0;
 357     if (channel_layout & AV_CH_FRONT_LEFT)
 358         channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_FRONT_LEFT;
 359     if (channel_layout & AV_CH_FRONT_RIGHT)
 360         channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_FRONT_RIGHT;
 361     if (channel_layout & AV_CH_FRONT_CENTER)
 362         channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_FRONT_CENTER;
 363     if (channel_layout & AV_CH_LOW_FREQUENCY)
 364         channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_LFE;
 365     if (channel_layout & AV_CH_BACK_LEFT)
 366         channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_REAR_LEFT;
 367     if (channel_layout & AV_CH_BACK_RIGHT)
 368         channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_REAR_RIGHT;
 369     if (channel_layout & AV_CH_FRONT_LEFT_OF_CENTER)
 370         channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER;
 371     if (channel_layout & AV_CH_FRONT_RIGHT_OF_CENTER)
 372         channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER;
 373     if (channel_layout & AV_CH_BACK_CENTER)
 374         channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_REAR_CENTER;
 375     if (channel_layout & AV_CH_SIDE_LEFT)
 376         channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_SIDE_LEFT;
 377     if (channel_layout & AV_CH_SIDE_RIGHT)
 378         channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_SIDE_RIGHT;
 379     if (channel_layout & AV_CH_TOP_CENTER)
 380         channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_TOP_CENTER;
 381     if (channel_layout & AV_CH_TOP_FRONT_LEFT)
 382         channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_TOP_FRONT_LEFT;
 383     if (channel_layout & AV_CH_TOP_FRONT_CENTER)
 384         channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_TOP_FRONT_CENTER;
 385     if (channel_layout & AV_CH_TOP_FRONT_RIGHT)
 386         channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_TOP_FRONT_RIGHT;
 387     if (channel_layout & AV_CH_TOP_BACK_LEFT)
 388         channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_TOP_REAR_LEFT;
 389     if (channel_layout & AV_CH_TOP_BACK_CENTER)
 390         channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_TOP_REAR_CENTER;
 391     if (channel_layout & AV_CH_TOP_BACK_RIGHT)
 392         channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_TOP_REAR_RIGHT;
 393     if (channel_layout & AV_CH_STEREO_LEFT)
 394         channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_FRONT_LEFT;
 395     if (channel_layout & AV_CH_STEREO_RIGHT)
 396         channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_FRONT_RIGHT;
 397     if (channel_layout & AV_CH_WIDE_LEFT)
 398         channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_AUX0;
 399     if (channel_layout & AV_CH_WIDE_RIGHT)
 400         channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_AUX1;
 401     if (channel_layout & AV_CH_SURROUND_DIRECT_LEFT)
 402         channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_AUX2;
 403     if (channel_layout & AV_CH_SURROUND_DIRECT_RIGHT)
 404         channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_AUX3;
 405     if (channel_layout & AV_CH_LOW_FREQUENCY_2)
 406         channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_LFE;
 407 }
 408
 409 static av_cold int pulse_write_trailer(AVFormatContext *h)
 410 {
 411     PulseData *s = h->priv_data;
 412
 413     if (s->mainloop) {
 414         pa_threaded_mainloop_lock(s->mainloop);
 415         if (s->stream) {
 416             pa_stream_disconnect(s->stream);
 417             pa_stream_set_state_callback(s->stream, NULL, NULL);
 418             pa_stream_set_write_callback(s->stream, NULL, NULL);
 419             pa_stream_set_overflow_callback(s->stream, NULL, NULL);
 420             pa_stream_set_underflow_callback(s->stream, NULL, NULL);
 421             pa_stream_unref(s->stream);
 422             s->stream = NULL;
 423         }
 424         if (s->ctx) {
 425             pa_context_disconnect(s->ctx);
 426             pa_context_set_state_callback(s->ctx, NULL, NULL);
 427             pa_context_set_subscribe_callback(s->ctx, NULL, NULL);
 428             pa_context_unref(s->ctx);
 429             s->ctx = NULL;
 430         }
 431         pa_threaded_mainloop_unlock(s->mainloop);
 432         pa_threaded_mainloop_stop(s->mainloop);
 433         pa_threaded_mainloop_free(s->mainloop);
 434         s->mainloop = NULL;
 435     }
 436
 437     return 0;
 438 }
 439
 440 static av_cold int pulse_write_header(AVFormatContext *h)
 441 {
 442     PulseData *s = h->priv_data;
 443     AVStream *st = NULL;
 444     int ret;
 445     pa_sample_spec sample_spec;
 446     pa_buffer_attr buffer_attributes = { -1, -1, -1, -1, -1 };
 447     pa_channel_map channel_map;
 448     pa_mainloop_api *mainloop_api;
 449     const char *stream_name = s->stream_name;
 450     static const pa_stream_flags_t stream_flags = PA_STREAM_INTERPOLATE_TIMING |
 451                                                   PA_STREAM_AUTO_TIMING_UPDATE |
 452                                                   PA_STREAM_NOT_MONOTONIC;
 453
 454     if (h->nb_streams != 1 || h->streams[0]->codec->codec_type != AVMEDIA_TYPE_AUDIO) {
 455         av_log(s, AV_LOG_ERROR, "Only a single audio stream is supported.\n");
 456         return AVERROR(EINVAL);
 457     }
 458     st = h->streams[0];
 459
 460     if (!stream_name) {
 461         if (h->filename[0])
 462             stream_name = h->filename;
 463         else
 464             stream_name = "Playback";
 465     }
 466     s->nonblocking = (h->flags & AVFMT_FLAG_NONBLOCK);
 467
 468     if (s->buffer_duration) {
 469         int64_t bytes = s->buffer_duration;
 470         bytes *= st->codec->channels * st->codec->sample_rate *
 471                  av_get_bytes_per_sample(st->codec->sample_fmt);
 472         bytes /= 1000;
 473         buffer_attributes.tlength = FFMAX(s->buffer_size, av_clip64(bytes, 0, UINT32_MAX - 1));
 474         av_log(s, AV_LOG_DEBUG,
 475                "Buffer duration: %ums recalculated into %"PRId64" bytes buffer.\n",
 476                s->buffer_duration, bytes);
 477         av_log(s, AV_LOG_DEBUG, "Real buffer length is %u bytes\n", buffer_attributes.tlength);
 478     } else if (s->buffer_size)
 479         buffer_attributes.tlength = s->buffer_size;
 480     if (s->prebuf)
 481         buffer_attributes.prebuf = s->prebuf;
 482     if (s->minreq)
 483         buffer_attributes.minreq = s->minreq;
 484
 485     sample_spec.format = ff_codec_id_to_pulse_format(st->codec->codec_id);
 486     sample_spec.rate = st->codec->sample_rate;
 487     sample_spec.channels = st->codec->channels;
 488     if (!pa_sample_spec_valid(&sample_spec)) {
 489         av_log(s, AV_LOG_ERROR, "Invalid sample spec.\n");
 490         return AVERROR(EINVAL);
 491     }
 492
 493     if (sample_spec.channels == 1) {
 494         channel_map.channels = 1;
 495         channel_map.map[0] = PA_CHANNEL_POSITION_MONO;
 496     } else if (st->codec->channel_layout) {
 497         if (av_get_channel_layout_nb_channels(st->codec->channel_layout) != st->codec->channels)
 498             return AVERROR(EINVAL);
 499         pulse_map_channels_to_pulse(st->codec->channel_layout, &channel_map);
 500         /* Unknown channel is present in channel_layout, let PulseAudio use its default. */
 501         if (channel_map.channels != sample_spec.channels) {
 502             av_log(s, AV_LOG_WARNING, "Unknown channel. Using defaul channel map.\n");
 503             channel_map.channels = 0;
 504         }
 505     } else
 506         channel_map.channels = 0;
 507
 508     if (!channel_map.channels)
 509         av_log(s, AV_LOG_WARNING, "Using PulseAudio's default channel map.\n");
 510     else if (!pa_channel_map_valid(&channel_map)) {
 511         av_log(s, AV_LOG_ERROR, "Invalid channel map.\n");
 512         return AVERROR(EINVAL);
 513     }
 514
 515     /* start main loop */
 516     s->mainloop = pa_threaded_mainloop_new();
 517     if (!s->mainloop) {
 518         av_log(s, AV_LOG_ERROR, "Cannot create threaded mainloop.\n");
 519         return AVERROR(ENOMEM);
 520     }
 521     if ((ret = pa_threaded_mainloop_start(s->mainloop)) < 0) {
 522         av_log(s, AV_LOG_ERROR, "Cannot start threaded mainloop: %s.\n", pa_strerror(ret));
 523         pa_threaded_mainloop_free(s->mainloop);
 524         s->mainloop = NULL;
 525         return AVERROR_EXTERNAL;
 526     }
 527
 528     pa_threaded_mainloop_lock(s->mainloop);
 529
 530     mainloop_api = pa_threaded_mainloop_get_api(s->mainloop);
 531     if (!mainloop_api) {
 532         av_log(s, AV_LOG_ERROR, "Cannot get mainloop API.\n");
 533         ret = AVERROR_EXTERNAL;
 534         goto fail;
 535     }
 536
 537     s->ctx = pa_context_new(mainloop_api, s->name);
 538     if (!s->ctx) {
 539         av_log(s, AV_LOG_ERROR, "Cannot create context.\n");
 540         ret = AVERROR(ENOMEM);
 541         goto fail;
 542     }
 543     pa_context_set_state_callback(s->ctx, pulse_context_state, s);
 544     pa_context_set_subscribe_callback(s->ctx, pulse_event, h);
 545
 546     if ((ret = pa_context_connect(s->ctx, s->server, 0, NULL)) < 0) {
 547         av_log(s, AV_LOG_ERROR, "Cannot connect context: %s.\n", pa_strerror(ret));
 548         ret = AVERROR_EXTERNAL;
 549         goto fail;
 550     }
 551
 552     if ((ret = pulse_context_wait(s)) < 0) {
 553         av_log(s, AV_LOG_ERROR, "Context failed.\n");
 554         goto fail;
 555     }
 556
 557     s->stream = pa_stream_new(s->ctx, stream_name, &sample_spec,
 558                               channel_map.channels ? &channel_map : NULL);
 559
 560     if ((ret = pulse_update_sink_info(h)) < 0) {
 561         av_log(s, AV_LOG_ERROR, "Updating sink info failed.\n");
 562         goto fail;
 563     }
 564
 565     if (!s->stream) {
 566         av_log(s, AV_LOG_ERROR, "Cannot create stream.\n");
 567         ret = AVERROR(ENOMEM);
 568         goto fail;
 569     }
 570     pa_stream_set_state_callback(s->stream, pulse_stream_state, s);
 571     pa_stream_set_write_callback(s->stream, pulse_stream_writable, h);
 572     pa_stream_set_overflow_callback(s->stream, pulse_overflow, h);
 573     pa_stream_set_underflow_callback(s->stream, pulse_underflow, h);
 574
 575     if ((ret = pa_stream_connect_playback(s->stream, s->device, &buffer_attributes,
 576                                           stream_flags, NULL, NULL)) < 0) {
 577         av_log(s, AV_LOG_ERROR, "pa_stream_connect_playback failed: %s.\n", pa_strerror(ret));
 578         ret = AVERROR_EXTERNAL;
 579         goto fail;
 580     }
 581
 582     if ((ret = pulse_stream_wait(s)) < 0) {
 583         av_log(s, AV_LOG_ERROR, "Stream failed.\n");
 584         goto fail;
 585     }
 586
 587     /* read back buffer attributes for future use */
 588     buffer_attributes = *pa_stream_get_buffer_attr(s->stream);
 589     s->buffer_size = buffer_attributes.tlength;
 590     s->prebuf = buffer_attributes.prebuf;
 591     s->minreq = buffer_attributes.minreq;
 592     av_log(s, AV_LOG_DEBUG, "Real buffer attributes: size: %d, prebuf: %d, minreq: %d\n",
 593            s->buffer_size, s->prebuf, s->minreq);
 594
 595     pa_threaded_mainloop_unlock(s->mainloop);
 596
 597     if ((ret = pulse_subscribe_events(s)) < 0) {
 598         av_log(s, AV_LOG_ERROR, "Event subscription failed.\n");
 599         /* a bit ugly but the simplest to lock here*/
 600         pa_threaded_mainloop_lock(s->mainloop);
 601         goto fail;
 602     }
 603
 604     /* force control messages */
 605     s->mute = -1;
 606     s->last_volume = PA_VOLUME_INVALID;
 607     pa_threaded_mainloop_lock(s->mainloop);
 608     if ((ret = pulse_update_sink_input_info(h)) < 0) {
 609         av_log(s, AV_LOG_ERROR, "Updating sink input info failed.\n");
 610         goto fail;
 611     }
 612     pa_threaded_mainloop_unlock(s->mainloop);
 613
 614     avpriv_set_pts_info(st, 64, 1, 1000000);  /* 64 bits pts in us */
 615
 616     return 0;
 617   fail:
 618     pa_threaded_mainloop_unlock(s->mainloop);
 619     pulse_write_trailer(h);
 620     return ret;
 621 }
 622
 623 static int pulse_write_packet(AVFormatContext *h, AVPacket *pkt)
 624 {
 625     PulseData *s = h->priv_data;
 626     int ret;
 627     int64_t writable_size;
 628
 629     if (!pkt)
 630         return pulse_flash_stream(s);
 631
 632     if (pkt->dts != AV_NOPTS_VALUE)
 633         s->timestamp = pkt->dts;
 634
 635     if (pkt->duration) {
 636         s->timestamp += pkt->duration;
 637     } else {
 638         AVStream *st = h->streams[0];
 639         AVCodecContext *codec_ctx = st->codec;
 640         AVRational r = { 1, codec_ctx->sample_rate };
 641         int64_t samples = pkt->size / (av_get_bytes_per_sample(codec_ctx->sample_fmt) * codec_ctx->channels);
 642         s->timestamp += av_rescale_q(samples, r, st->time_base);
 643     }
 644
 645     pa_threaded_mainloop_lock(s->mainloop);
 646     if (!PA_STREAM_IS_GOOD(pa_stream_get_state(s->stream))) {
 647         av_log(s, AV_LOG_ERROR, "PulseAudio stream is in invalid state.\n");
 648         goto fail;
 649     }
 650     while (pa_stream_writable_size(s->stream) < s->minreq) {
 651         if (s->nonblocking) {
 652             pa_threaded_mainloop_unlock(s->mainloop);
 653             return AVERROR(EAGAIN);
 654         } else
 655             pa_threaded_mainloop_wait(s->mainloop);
 656     }
 657
 658     if ((ret = pa_stream_write(s->stream, pkt->data, pkt->size, NULL, 0, PA_SEEK_RELATIVE)) < 0) {
 659         av_log(s, AV_LOG_ERROR, "pa_stream_write failed: %s\n", pa_strerror(ret));
 660         goto fail;
 661     }
 662     if ((writable_size = pa_stream_writable_size(s->stream)) >= s->minreq)
 663         avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_BUFFER_WRITABLE, &writable_size, sizeof(writable_size));
 664
 665     pa_threaded_mainloop_unlock(s->mainloop);
 666
 667     return 0;
 668   fail:
 669     pa_threaded_mainloop_unlock(s->mainloop);
 670     return AVERROR_EXTERNAL;
 671 }
 672
 673 static int pulse_write_frame(AVFormatContext *h, int stream_index,
 674                              AVFrame **frame, unsigned flags)
 675 {
 676     AVPacket pkt;
 677
 678     /* Planar formats are not supported yet. */
 679     if (flags & AV_WRITE_UNCODED_FRAME_QUERY)
 680         return av_sample_fmt_is_planar(h->streams[stream_index]->codec->sample_fmt) ?
 681                AVERROR(EINVAL) : 0;
 682
 683     pkt.data     = (*frame)->data[0];
 684     pkt.size     = (*frame)->nb_samples * av_get_bytes_per_sample((*frame)->format) * av_frame_get_channels(*frame);
 685     pkt.dts      = (*frame)->pkt_dts;
 686     pkt.duration = av_frame_get_pkt_duration(*frame);
 687     return pulse_write_packet(h, &pkt);
 688 }
 689
 690
 691 static void pulse_get_output_timestamp(AVFormatContext *h, int stream, int64_t *dts, int64_t *wall)
 692 {
 693     PulseData *s = h->priv_data;
 694     pa_usec_t latency;
 695     int neg;
 696     pa_threaded_mainloop_lock(s->mainloop);
 697     pa_stream_get_latency(s->stream, &latency, &neg);
 698     pa_threaded_mainloop_unlock(s->mainloop);
 699     if (wall)
 700         *wall = av_gettime();
 701     if (dts)
 702         *dts = s->timestamp - (neg ? -latency : latency);
 703 }
 704
 705 static int pulse_get_device_list(AVFormatContext *h, AVDeviceInfoList *device_list)
 706 {
 707     PulseData *s = h->priv_data;
 708     return ff_pulse_audio_get_devices(device_list, s->server, 1);
 709 }
 710
 711 static int pulse_control_message(AVFormatContext *h, int type,
 712                                  void *data, size_t data_size)
 713 {
 714     PulseData *s = h->priv_data;
 715     int ret;
 716
 717     switch(type) {
 718     case AV_APP_TO_DEV_PAUSE:
 719         return pulse_set_pause(s, 1);
 720     case AV_APP_TO_DEV_PLAY:
 721         return pulse_set_pause(s, 0);
 722     case AV_APP_TO_DEV_TOGGLE_PAUSE:
 723         return pulse_set_pause(s, !pa_stream_is_corked(s->stream));
 724     case AV_APP_TO_DEV_MUTE:
 725         if (!s->mute) {
 726             s->mute = 1;
 727             return pulse_set_mute(s);
 728         }
 729         return 0;
 730     case AV_APP_TO_DEV_UNMUTE:
 731         if (s->mute) {
 732             s->mute = 0;
 733             return pulse_set_mute(s);
 734         }
 735         return 0;
 736     case AV_APP_TO_DEV_TOGGLE_MUTE:
 737         s->mute = !s->mute;
 738         return pulse_set_mute(s);
 739     case AV_APP_TO_DEV_SET_VOLUME:
 740         return pulse_set_volume(s, *(double *)data);
 741     case AV_APP_TO_DEV_GET_VOLUME:
 742         s->last_volume = PA_VOLUME_INVALID;
 743         pa_threaded_mainloop_lock(s->mainloop);
 744         ret = pulse_update_sink_input_info(h);
 745         pa_threaded_mainloop_unlock(s->mainloop);
 746         return ret;
 747     case AV_APP_TO_DEV_GET_MUTE:
 748         s->mute = -1;
 749         pa_threaded_mainloop_lock(s->mainloop);
 750         ret = pulse_update_sink_input_info(h);
 751         pa_threaded_mainloop_unlock(s->mainloop);
 752         return ret;
 753     default:
 754         break;
 755     }
 756     return AVERROR(ENOSYS);
 757 }
 758
 759 #define OFFSET(a) offsetof(PulseData, a)
 760 #define E AV_OPT_FLAG_ENCODING_PARAM
 761 static const AVOption options[] = {
 762     { "server",          "set PulseAudio server",            OFFSET(server),          AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
 763     { "name",            "set application name",             OFFSET(name),            AV_OPT_TYPE_STRING, {.str = LIBAVFORMAT_IDENT},  0, 0, E },
 764     { "stream_name",     "set stream description",           OFFSET(stream_name),     AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
 765     { "device",          "set device name",                  OFFSET(device),          AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
 766     { "buffer_size",     "set buffer size in bytes",         OFFSET(buffer_size),     AV_OPT_TYPE_INT,    {.i64 = 0}, 0, INT_MAX, E },
 767     { "buffer_duration", "set buffer duration in millisecs", OFFSET(buffer_duration), AV_OPT_TYPE_INT,    {.i64 = 0}, 0, INT_MAX, E },
 768     { "prebuf",          "set pre-buffering size",           OFFSET(prebuf),          AV_OPT_TYPE_INT,    {.i64 = 0}, 0, INT_MAX, E },
 769     { "minreq",          "set minimum request size",         OFFSET(minreq),          AV_OPT_TYPE_INT,    {.i64 = 0}, 0, INT_MAX, E },
 770     { NULL }
 771 };
 772
 773 static const AVClass pulse_muxer_class = {
 774     .class_name     = "PulseAudio muxer",
 775     .item_name      = av_default_item_name,
 776     .option         = options,
 777     .version        = LIBAVUTIL_VERSION_INT,
 778     .category       = AV_CLASS_CATEGORY_DEVICE_AUDIO_OUTPUT,
 779 };
 780
 781 AVOutputFormat ff_pulse_muxer = {
 782     .name                 = "pulse",
 783     .long_name            = NULL_IF_CONFIG_SMALL("Pulse audio output"),
 784     .priv_data_size       = sizeof(PulseData),
 785     .audio_codec          = AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE),
 786     .video_codec          = AV_CODEC_ID_NONE,
 787     .write_header         = pulse_write_header,
 788     .write_packet         = pulse_write_packet,
 789     .write_uncoded_frame  = pulse_write_frame,
 790     .write_trailer        = pulse_write_trailer,
 791     .get_output_timestamp = pulse_get_output_timestamp,
 792     .get_device_list      = pulse_get_device_list,
 793     .control_message      = pulse_control_message,
 794     .flags                = AVFMT_NOFILE | AVFMT_ALLOW_FLUSH,
 795     .priv_class           = &pulse_muxer_class,
 796 };