plugins/sound_alsa/sound_alsa.h

   1 #include <ptlib.h>
   2
   3 #define ALSA_PCM_NEW_HW_PARAMS_API 1
   4 #include <alsa/asoundlib.h>
   5
   6 class PAudioDelay : public PObject
   7 {
   8   PCLASSINFO(PAudioDelay, PObject);
   9
  10   public:
  11     PAudioDelay();
  12     BOOL Delay(int time);
  13     void Restart();
  14     int  GetError();
  15
  16   protected:
  17     PTime  previousTime;
  18     BOOL   firstTime;
  19     int    error;
  20 };
  21
  22 #define MIN_HEADROOM    30
  23 #define MAX_HEADROOM    60
  24
  25 class SoundHandleEntry : public PObject {
  26
  27   PCLASSINFO(SoundHandleEntry, PObject)
  28
  29   public:
  30     SoundHandleEntry();
  31
  32     int handle;
  33     int direction;
  34
  35     unsigned numChannels;
  36     unsigned sampleRate;
  37     unsigned bitsPerSample;
  38     unsigned fragmentValue;
  39     BOOL isInitialised;
  40 };
  41
  42 #define LOOPBACK_BUFFER_SIZE 5000
  43 #define BYTESINBUF ((startptr<endptr)?(endptr-startptr):(LOOPBACK_BUFFER_SIZE+endptr-startptr))
  44
  45 class PSoundChannelALSA: public PSoundChannel
  46 {
  47  public:
  48   PSoundChannelALSA();
  49   void Construct();
  50   PSoundChannelALSA(const PString &device,
  51                    PSoundChannel::Directions dir,
  52                    unsigned numChannels,
  53                    unsigned sampleRate,
  54                    unsigned bitsPerSample);
  55   ~PSoundChannelALSA();
  56   static PStringArray GetDeviceNames(PSoundChannel::Directions);
  57   static PString GetDefaultDevice(PSoundChannel::Directions);
  58   BOOL Open(const PString & _device,
  59        Directions _dir,
  60        unsigned _numChannels,
  61        unsigned _sampleRate,
  62        unsigned _bitsPerSample);
  63   BOOL Setup();
  64   BOOL Close();
  65   BOOL Write(const void * buf, PINDEX len);
  66   BOOL Read(void * buf, PINDEX len);
  67   BOOL SetFormat(unsigned numChannels,
  68             unsigned sampleRate,
  69             unsigned bitsPerSample);
  70   unsigned GetChannels() const;
  71   unsigned GetSampleRate() const;
  72   unsigned GetSampleSize() const;
  73   BOOL SetBuffers(PINDEX size, PINDEX count);
  74   BOOL GetBuffers(PINDEX & size, PINDEX & count);
  75   BOOL PlaySound(const PSound & sound, BOOL wait);
  76   BOOL PlayFile(const PFilePath & filename, BOOL wait);
  77   BOOL HasPlayCompleted();
  78   BOOL WaitForPlayCompletion();
  79   BOOL RecordSound(PSound & sound);
  80   BOOL RecordFile(const PFilePath & filename);
  81   BOOL StartRecording();
  82   BOOL IsRecordBufferFull();
  83   BOOL AreAllRecordBuffersFull();
  84   BOOL WaitForRecordBufferFull();
  85   BOOL WaitForAllRecordBuffersFull();
  86   BOOL Abort();
  87   BOOL SetVolume (unsigned);
  88   BOOL GetVolume (unsigned &);
  89   BOOL IsOpen() const;
  90
  91  private:
  92
  93   BOOL Volume (BOOL, unsigned, unsigned &);
  94   PSoundChannel::Directions direction;
  95   PString device;
  96   unsigned mNumChannels;
  97   unsigned mSampleRate;
  98   unsigned mBitsPerSample;
  99   BOOL isInitialised;
 100
 101   snd_pcm_t *os_handle; /* Handle, different from the PChannel handle */
 102   int card_nr;
 103   int frame_bytes; /* Number of bytes in a frame */
 104   snd_pcm_uframes_t period_size;
 105   unsigned int periods;
 106   PMutex device_mutex;
 107 };