/[svn]/linuxsampler/trunk/src/audioio.h
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revision 30 by schoenebeck, Fri Nov 21 15:07:23 2003 UTC revision 31 by schoenebeck, Sun Jan 18 20:31:31 2004 UTC
# Line 23  Line 23 
23  #ifndef __AUDIO_H__  #ifndef __AUDIO_H__
24  #define __AUDIO_H__  #define __AUDIO_H__
25    
 // We only support Alsa at the moment  
   
 #include <string>  
 #include <stdio.h>  
 #include <stdlib.h>  
 #include <string.h>  
 #include <unistd.h>  
 #include <alsa/asoundlib.h>  
 #include <sched.h>  
 #include <sys/mman.h>  
   
26  #include "global.h"  #include "global.h"
27    
28    // just symbol prototyping
29    class AudioThread;
30    
31    /**
32     * Abstract class for audio output in LinuxSampler. This class will be
33     * derived by specialized classes which implement the connection to a
34     * specific audio output system (e.g. Alsa, Jack).
35     */
36  class AudioIO {  class AudioIO {
37      public:      public:
         bool     Initialized;  
         int16_t* pOutputBuffer;  ///< This is the buffer where the final mix will be copied to and send to the sound card  
         uint     Channels;  
         uint     Samplerate;  
         uint     Fragments;  
         uint     FragmentSize;   ///< in sample points  
   
38          AudioIO();          AudioIO();
39         ~AudioIO();          virtual ~AudioIO();
40          int  Initialize(uint channels, uint samplerate, uint numfragments, uint fragmentsize);          virtual void  Activate() = 0;
41          int  Output();          virtual void  Close() = 0;
42          void Close();          virtual void* GetInterleavedOutputBuffer() = 0;
43      private:          virtual void* GetChannelOutputBufer(uint Channel) = 0;
44          typedef std::string  String;          inline  void  AssignEngine(AudioThread* pAudioThread) { pEngine = pAudioThread;      };
45            inline  bool  Initialized()                           { return bInitialized;         };
46          String               pcm_name;    ///< Name of the PCM device, like plughw:0,0 the first number is the number of the soundcard, the second number is the number of the device.          inline  bool  Interleaved()                           { return bInterleaved;         };
47          snd_pcm_t*           pcm_handle;  ///< Handle for the PCM device          inline  uint  Channels()                              { return uiChannels;           };
48          snd_pcm_stream_t     stream;          inline  uint  SampleRate()                            { return uiSamplerate;         };
49          snd_pcm_hw_params_t* hwparams;    ///< This structure contains information about the hardware and can be used to specify the configuration to be used for the PCM stream.          inline  uint  MaxSamplesPerCycle()                    { return uiMaxSamplesPerCycle; };
50          snd_pcm_sw_params_t* swparams;      protected:
51            bool bInitialized;
52          bool HardwareParametersSupported(uint channels, int samplerate, uint numfragments, uint fragmentsize);          bool bInterleaved;
53            uint uiChannels;
54            uint uiSamplerate;
55            uint uiMaxSamplesPerCycle;   ///< in sample points
56            AudioThread* pEngine;
57  };  };
58    
59  #endif // __AUDIO_H__  #endif // __AUDIO_H__
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