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  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. };
  797.