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  1. /*
  2.  * Pulseaudio input
  3.  * Copyright (c) 2011 Luca Barbato <lu_zero@gentoo.org>
  4.  * Copyright 2004-2006 Lennart Poettering
  5.  * Copyright (c) 2014 Michael Niedermayer <michaelni@gmx.at>
  6.  *
  7.  * This file is part of FFmpeg.
  8.  *
  9.  * FFmpeg is free software; you can redistribute it and/or
  10.  * modify it under the terms of the GNU Lesser General Public
  11.  * License as published by the Free Software Foundation; either
  12.  * version 2.1 of the License, or (at your option) any later version.
  13.  *
  14.  * FFmpeg is distributed in the hope that it will be useful,
  15.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17.  * Lesser General Public License for more details.
  18.  *
  19.  * You should have received a copy of the GNU Lesser General Public
  20.  * License along with FFmpeg; if not, write to the Free Software
  21.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22.  */
  23.  
  24. #include <pulse/rtclock.h>
  25. #include <pulse/error.h>
  26.  
  27. #include "libavutil/internal.h"
  28. #include "libavutil/opt.h"
  29. #include "libavutil/time.h"
  30.  
  31. #include "libavformat/avformat.h"
  32. #include "libavformat/internal.h"
  33. #include "pulse_audio_common.h"
  34. #include "timefilter.h"
  35.  
  36. #define DEFAULT_CODEC_ID AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE)
  37.  
  38. typedef struct PulseData {
  39.     AVClass *class;
  40.     char *server;
  41.     char *name;
  42.     char *stream_name;
  43.     int  sample_rate;
  44.     int  channels;
  45.     int  frame_size;
  46.     int  fragment_size;
  47.  
  48.     pa_threaded_mainloop *mainloop;
  49.     pa_context *context;
  50.     pa_stream *stream;
  51.  
  52.     TimeFilter *timefilter;
  53.     int last_period;
  54.     int wallclock;
  55. } PulseData;
  56.  
  57.  
  58. #define CHECK_SUCCESS_GOTO(rerror, expression, label)        \
  59.     do {                                                        \
  60.         if (!(expression)) {                                    \
  61.             rerror = AVERROR_EXTERNAL;                          \
  62.             goto label;                                         \
  63.         }                                                       \
  64.     } while (0)
  65.  
  66. #define CHECK_DEAD_GOTO(p, rerror, label)                               \
  67.     do {                                                                \
  68.         if (!(p)->context || !PA_CONTEXT_IS_GOOD(pa_context_get_state((p)->context)) || \
  69.             !(p)->stream || !PA_STREAM_IS_GOOD(pa_stream_get_state((p)->stream))) { \
  70.             rerror = AVERROR_EXTERNAL;                                  \
  71.             goto label;                                                 \
  72.         }                                                               \
  73.     } while (0)
  74.  
  75. static void context_state_cb(pa_context *c, void *userdata) {
  76.     PulseData *p = userdata;
  77.  
  78.     switch (pa_context_get_state(c)) {
  79.         case PA_CONTEXT_READY:
  80.         case PA_CONTEXT_TERMINATED:
  81.         case PA_CONTEXT_FAILED:
  82.             pa_threaded_mainloop_signal(p->mainloop, 0);
  83.             break;
  84.     }
  85. }
  86.  
  87. static void stream_state_cb(pa_stream *s, void * userdata) {
  88.     PulseData *p = userdata;
  89.  
  90.     switch (pa_stream_get_state(s)) {
  91.         case PA_STREAM_READY:
  92.         case PA_STREAM_FAILED:
  93.         case PA_STREAM_TERMINATED:
  94.             pa_threaded_mainloop_signal(p->mainloop, 0);
  95.             break;
  96.     }
  97. }
  98.  
  99. static void stream_request_cb(pa_stream *s, size_t length, void *userdata) {
  100.     PulseData *p = userdata;
  101.  
  102.     pa_threaded_mainloop_signal(p->mainloop, 0);
  103. }
  104.  
  105. static void stream_latency_update_cb(pa_stream *s, void *userdata) {
  106.     PulseData *p = userdata;
  107.  
  108.     pa_threaded_mainloop_signal(p->mainloop, 0);
  109. }
  110.  
  111. static av_cold int pulse_close(AVFormatContext *s)
  112. {
  113.     PulseData *pd = s->priv_data;
  114.  
  115.     if (pd->mainloop)
  116.         pa_threaded_mainloop_stop(pd->mainloop);
  117.  
  118.     if (pd->stream)
  119.         pa_stream_unref(pd->stream);
  120.     pd->stream = NULL;
  121.  
  122.     if (pd->context) {
  123.         pa_context_disconnect(pd->context);
  124.         pa_context_unref(pd->context);
  125.     }
  126.     pd->context = NULL;
  127.  
  128.     if (pd->mainloop)
  129.         pa_threaded_mainloop_free(pd->mainloop);
  130.     pd->mainloop = NULL;
  131.  
  132.     ff_timefilter_destroy(pd->timefilter);
  133.     pd->timefilter = NULL;
  134.  
  135.     return 0;
  136. }
  137.  
  138. static av_cold int pulse_read_header(AVFormatContext *s)
  139. {
  140.     PulseData *pd = s->priv_data;
  141.     AVStream *st;
  142.     char *device = NULL;
  143.     int ret;
  144.     enum AVCodecID codec_id =
  145.         s->audio_codec_id == AV_CODEC_ID_NONE ? DEFAULT_CODEC_ID : s->audio_codec_id;
  146.     const pa_sample_spec ss = { ff_codec_id_to_pulse_format(codec_id),
  147.                                 pd->sample_rate,
  148.                                 pd->channels };
  149.  
  150.     pa_buffer_attr attr = { -1 };
  151.  
  152.     st = avformat_new_stream(s, NULL);
  153.  
  154.     if (!st) {
  155.         av_log(s, AV_LOG_ERROR, "Cannot add stream\n");
  156.         return AVERROR(ENOMEM);
  157.     }
  158.  
  159.     attr.fragsize = pd->fragment_size;
  160.  
  161.     if (s->filename[0] != '\0' && strcmp(s->filename, "default"))
  162.         device = s->filename;
  163.  
  164.     if (!(pd->mainloop = pa_threaded_mainloop_new())) {
  165.         pulse_close(s);
  166.         return AVERROR_EXTERNAL;
  167.     }
  168.  
  169.     if (!(pd->context = pa_context_new(pa_threaded_mainloop_get_api(pd->mainloop), pd->name))) {
  170.         pulse_close(s);
  171.         return AVERROR_EXTERNAL;
  172.     }
  173.  
  174.     pa_context_set_state_callback(pd->context, context_state_cb, pd);
  175.  
  176.     if (pa_context_connect(pd->context, pd->server, 0, NULL) < 0) {
  177.         pulse_close(s);
  178.         return AVERROR(pa_context_errno(pd->context));
  179.     }
  180.  
  181.     pa_threaded_mainloop_lock(pd->mainloop);
  182.  
  183.     if (pa_threaded_mainloop_start(pd->mainloop) < 0) {
  184.         ret = -1;
  185.         goto unlock_and_fail;
  186.     }
  187.  
  188.     for (;;) {
  189.         pa_context_state_t state;
  190.  
  191.         state = pa_context_get_state(pd->context);
  192.  
  193.         if (state == PA_CONTEXT_READY)
  194.             break;
  195.  
  196.         if (!PA_CONTEXT_IS_GOOD(state)) {
  197.             ret = AVERROR(pa_context_errno(pd->context));
  198.             goto unlock_and_fail;
  199.         }
  200.  
  201.         /* Wait until the context is ready */
  202.         pa_threaded_mainloop_wait(pd->mainloop);
  203.     }
  204.  
  205.     if (!(pd->stream = pa_stream_new(pd->context, pd->stream_name, &ss, NULL))) {
  206.         ret = AVERROR(pa_context_errno(pd->context));
  207.         goto unlock_and_fail;
  208.     }
  209.  
  210.     pa_stream_set_state_callback(pd->stream, stream_state_cb, pd);
  211.     pa_stream_set_read_callback(pd->stream, stream_request_cb, pd);
  212.     pa_stream_set_write_callback(pd->stream, stream_request_cb, pd);
  213.     pa_stream_set_latency_update_callback(pd->stream, stream_latency_update_cb, pd);
  214.  
  215.     ret = pa_stream_connect_record(pd->stream, device, &attr,
  216.                                     PA_STREAM_INTERPOLATE_TIMING
  217.                                     |PA_STREAM_ADJUST_LATENCY
  218.                                     |PA_STREAM_AUTO_TIMING_UPDATE);
  219.  
  220.     if (ret < 0) {
  221.         ret = AVERROR(pa_context_errno(pd->context));
  222.         goto unlock_and_fail;
  223.     }
  224.  
  225.     for (;;) {
  226.         pa_stream_state_t state;
  227.  
  228.         state = pa_stream_get_state(pd->stream);
  229.  
  230.         if (state == PA_STREAM_READY)
  231.             break;
  232.  
  233.         if (!PA_STREAM_IS_GOOD(state)) {
  234.             ret = AVERROR(pa_context_errno(pd->context));
  235.             goto unlock_and_fail;
  236.         }
  237.  
  238.         /* Wait until the stream is ready */
  239.         pa_threaded_mainloop_wait(pd->mainloop);
  240.     }
  241.  
  242.     pa_threaded_mainloop_unlock(pd->mainloop);
  243.  
  244.     /* take real parameters */
  245.     st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
  246.     st->codec->codec_id    = codec_id;
  247.     st->codec->sample_rate = pd->sample_rate;
  248.     st->codec->channels    = pd->channels;
  249.     avpriv_set_pts_info(st, 64, 1, 1000000);  /* 64 bits pts in us */
  250.  
  251.     pd->timefilter = ff_timefilter_new(1000000.0 / pd->sample_rate,
  252.                                        1000, 1.5E-6);
  253.  
  254.     if (!pd->timefilter) {
  255.         pulse_close(s);
  256.         return AVERROR(ENOMEM);
  257.     }
  258.  
  259.     return 0;
  260.  
  261. unlock_and_fail:
  262.     pa_threaded_mainloop_unlock(pd->mainloop);
  263.  
  264.     pulse_close(s);
  265.     return ret;
  266. }
  267.  
  268. static int pulse_read_packet(AVFormatContext *s, AVPacket *pkt)
  269. {
  270.     PulseData *pd  = s->priv_data;
  271.     int ret;
  272.     size_t read_length;
  273.     const void *read_data = NULL;
  274.     int64_t dts;
  275.     pa_usec_t latency;
  276.     int negative;
  277.  
  278.     pa_threaded_mainloop_lock(pd->mainloop);
  279.  
  280.     CHECK_DEAD_GOTO(pd, ret, unlock_and_fail);
  281.  
  282.     while (!read_data) {
  283.         int r;
  284.  
  285.         r = pa_stream_peek(pd->stream, &read_data, &read_length);
  286.         CHECK_SUCCESS_GOTO(ret, r == 0, unlock_and_fail);
  287.  
  288.         if (read_length <= 0) {
  289.             pa_threaded_mainloop_wait(pd->mainloop);
  290.             CHECK_DEAD_GOTO(pd, ret, unlock_and_fail);
  291.         } else if (!read_data) {
  292.             /* There's a hole in the stream, skip it. We could generate
  293.                 * silence, but that wouldn't work for compressed streams. */
  294.             r = pa_stream_drop(pd->stream);
  295.             CHECK_SUCCESS_GOTO(ret, r == 0, unlock_and_fail);
  296.         }
  297.     }
  298.  
  299.     if (av_new_packet(pkt, read_length) < 0) {
  300.         ret = AVERROR(ENOMEM);
  301.         goto unlock_and_fail;
  302.     }
  303.  
  304.     dts = av_gettime();
  305.     pa_operation_unref(pa_stream_update_timing_info(pd->stream, NULL, NULL));
  306.  
  307.     if (pa_stream_get_latency(pd->stream, &latency, &negative) >= 0) {
  308.         enum AVCodecID codec_id =
  309.             s->audio_codec_id == AV_CODEC_ID_NONE ? DEFAULT_CODEC_ID : s->audio_codec_id;
  310.         int frame_size = ((av_get_bits_per_sample(codec_id) >> 3) * pd->channels);
  311.         int frame_duration = read_length / frame_size;
  312.  
  313.  
  314.         if (negative) {
  315.             dts += latency;
  316.         } else
  317.             dts -= latency;
  318.         if (pd->wallclock)
  319.             pkt->pts = ff_timefilter_update(pd->timefilter, dts, pd->last_period);
  320.  
  321.         pd->last_period = frame_duration;
  322.     } else {
  323.         av_log(s, AV_LOG_WARNING, "pa_stream_get_latency() failed\n");
  324.     }
  325.  
  326.     memcpy(pkt->data, read_data, read_length);
  327.     pa_stream_drop(pd->stream);
  328.  
  329.     pa_threaded_mainloop_unlock(pd->mainloop);
  330.     return 0;
  331.  
  332. unlock_and_fail:
  333.     pa_threaded_mainloop_unlock(pd->mainloop);
  334.     return ret;
  335. }
  336.  
  337. static int pulse_get_device_list(AVFormatContext *h, AVDeviceInfoList *device_list)
  338. {
  339.     PulseData *s = h->priv_data;
  340.     return ff_pulse_audio_get_devices(device_list, s->server, 0);
  341. }
  342.  
  343. #define OFFSET(a) offsetof(PulseData, a)
  344. #define D AV_OPT_FLAG_DECODING_PARAM
  345.  
  346. static const AVOption options[] = {
  347.     { "server",        "set PulseAudio server",                             OFFSET(server),        AV_OPT_TYPE_STRING, {.str = NULL},     0, 0, D },
  348.     { "name",          "set application name",                              OFFSET(name),          AV_OPT_TYPE_STRING, {.str = LIBAVFORMAT_IDENT},  0, 0, D },
  349.     { "stream_name",   "set stream description",                            OFFSET(stream_name),   AV_OPT_TYPE_STRING, {.str = "record"}, 0, 0, D },
  350.     { "sample_rate",   "set sample rate in Hz",                             OFFSET(sample_rate),   AV_OPT_TYPE_INT,    {.i64 = 48000},    1, INT_MAX, D },
  351.     { "channels",      "set number of audio channels",                      OFFSET(channels),      AV_OPT_TYPE_INT,    {.i64 = 2},        1, INT_MAX, D },
  352.     { "frame_size",    "set number of bytes per frame",                     OFFSET(frame_size),    AV_OPT_TYPE_INT,    {.i64 = 1024},     1, INT_MAX, D },
  353.     { "fragment_size", "set buffering size, affects latency and cpu usage", OFFSET(fragment_size), AV_OPT_TYPE_INT,    {.i64 = -1},      -1, INT_MAX, D },
  354.     { "wallclock",     "set the initial pts using the current time",     OFFSET(wallclock),     AV_OPT_TYPE_INT,    {.i64 = 1},       -1, 1, D },
  355.     { NULL },
  356. };
  357.  
  358. static const AVClass pulse_demuxer_class = {
  359.     .class_name     = "Pulse demuxer",
  360.     .item_name      = av_default_item_name,
  361.     .option         = options,
  362.     .version        = LIBAVUTIL_VERSION_INT,
  363.     .category       = AV_CLASS_CATEGORY_DEVICE_AUDIO_INPUT,
  364. };
  365.  
  366. AVInputFormat ff_pulse_demuxer = {
  367.     .name           = "pulse",
  368.     .long_name      = NULL_IF_CONFIG_SMALL("Pulse audio input"),
  369.     .priv_data_size = sizeof(PulseData),
  370.     .read_header    = pulse_read_header,
  371.     .read_packet    = pulse_read_packet,
  372.     .read_close     = pulse_close,
  373.     .get_device_list = pulse_get_device_list,
  374.     .flags          = AVFMT_NOFILE,
  375.     .priv_class     = &pulse_demuxer_class,
  376. };
  377.