src/audio-alsa.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
   2 /*
   3  * audio-alsa.h:
   4  *
   5  * Contact:
   6  *   Moonlight List (moonlight-list@lists.ximian.com)
   7  *
   8  * Copyright 2008 Novell, Inc. (http://www.novell.com)
   9  *
  10  * See the LICENSE file included with the distribution for details.
  11  */
  12
  13 #if INCLUDE_ALSA
  14
  15 #ifndef __AUDIO_ALSA_H__
  16 #define __AUDIO_ALSA_H__
  17
  18 #include <pthread.h>
  19 #include <poll.h>
  20 #include <asoundlib.h>
  21
  22 #include "audio.h"
  23 #include "mutex.h"
  24
  25 class AlsaPlayer;
  26
  27 class AlsaSource : public AudioSource {
  28         AlsaPlayer *player;
  29         snd_pcm_t *pcm;
  30         snd_pcm_uframes_t period_size;
  31         snd_pcm_uframes_t buffer_size;
  32
  33         Mutex mutex;
  34
  35         bool initialized;
  36         bool mmap;
  37         bool started;
  38         bool drop_pending;
  39
  40         bool SetupHW ();
  41         bool PreparePcm (snd_pcm_sframes_t *avail);
  42
  43         // Underrun recovery
  44         // Handles EPIPE and ESTRPIPE, prints an error if recovery failed
  45         // or if err isn't any of the above values.
  46         bool XrunRecovery (int err);
  47
  48         bool WriteRW ();
  49         bool WriteMmap ();
  50
  51         void Drain ();
  52
  53         bool InitializeAlsa ();
  54         void CloseAlsa ();
  55
  56  protected:
  57         virtual ~AlsaSource ();
  58
  59         virtual void Played ();
  60         virtual void Paused ();
  61         virtual void Stopped ();
  62         virtual void StateChanged (AudioState old_state);
  63         virtual guint64 GetDelayInternal ();
  64
  65         virtual bool InitializeInternal ();
  66         virtual void CloseInternal ();
  67
  68  public:
  69         pollfd *udfs;
  70         int ndfs;
  71
  72         AlsaSource (AlsaPlayer *player, MediaPlayer *mplayer, AudioStream *stream);
  73
  74         // Pushes data onto the pcm device if the
  75         // device can accept more data, and if the
  76         // there is data availabe. The node has to
  77         // be locked during playback.
  78         // Returns false if nothing has been played.
  79         bool WriteAlsa ();
  80
  81         bool IsDropPending () { return drop_pending; }
  82         void DropAlsa ();
  83 };
  84
  85 class AlsaPlayer : public AudioPlayer {
  86         // The audio thread
  87         pthread_t *audio_thread;
  88         bool shutdown; // set to true to exit the audio thread.
  89
  90         // A list of all the file descriptors in all the
  91         // audio nodes. We need to poll on changes in any of the
  92         // descriptors, so we create a big list with all of them
  93         // and poll on that.
  94         pollfd *udfs;
  95         int ndfs;
  96
  97         // We also need to be able to wake up from the poll
  98         // whenever we want to, so we create a pipe which we
  99         // poll on. This is always the first file descriptor
 100         // in udfs.
 101         int fds [2];
 102
 103         // If UpdatePollList must be called before polling.
 104         bool update_poll_pending;
 105
 106         // The audio loop which is executed
 107         // on the audio thread.
 108         void Loop ();
 109         static void *Loop (void *data);
 110
 111         void WakeUp (); // Wakes up the audio thread.
 112
 113  protected:
 114         virtual ~AlsaPlayer ();
 115
 116         virtual void AddInternal (AudioSource *node);
 117         virtual void RemoveInternal (AudioSource *node);
 118         virtual void PrepareShutdownInternal ();
 119         virtual void FinishShutdownInternal ();
 120         virtual bool Initialize ();
 121         virtual AudioSource *CreateNode (MediaPlayer *mplayer, AudioStream *stream);
 122
 123  public:
 124         AlsaPlayer ();
 125
 126         void UpdatePollList ();
 127
 128         static bool IsInstalled ();
 129 };
 130
 131 #endif /* __AUDI_ALSA_H__ */
 132
 133 #endif /* INCLUDE_ALSA */