interpretor/preprocessor/faust-0.9.47mr3/architecture/audio/portaudio-dsp.h

   1 /************************************************************************
   2
   3         IMPORTANT NOTE : this file contains two clearly delimited sections :
   4         the ARCHITECTURE section (in two parts) and the USER section. Each section
   5         is governed by its own copyright and license. Please check individually
   6         each section for license and copyright information.
   7 *************************************************************************/
   8
   9 /*******************BEGIN ARCHITECTURE SECTION (part 1/2)****************/
  10
  11 /************************************************************************
  12     FAUST Architecture File
  13         Copyright (C) 2003-2011 GRAME, Centre National de Creation Musicale
  14     ---------------------------------------------------------------------
  15     This Architecture section is free software; you can redistribute it
  16     and/or modify it under the terms of the GNU General Public License
  17         as published by the Free Software Foundation; either version 3 of
  18         the License, or (at your option) any later version.
  19
  20     This program is distributed in the hope that it will be useful,
  21     but WITHOUT ANY WARRANTY; without even the implied warranty of
  22     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23     GNU General Public License for more details.
  24
  25     You should have received a copy of the GNU General Public License
  26         along with this program; If not, see <http://www.gnu.org/licenses/>.
  27
  28         EXCEPTION : As a special exception, you may create a larger work
  29         that contains this FAUST architecture section and distribute
  30         that work under terms of your choice, so long as this FAUST
  31         architecture section is not modified.
  32
  33
  34  ************************************************************************
  35  ************************************************************************/
  36
  37
  38 #ifndef __portaudio_dsp__
  39 #define __portaudio_dsp__
  40
  41 #include <stdio.h>
  42 #include <assert.h>
  43 #include <portaudio.h>
  44
  45 #include "audio.h"
  46 #include "dsp.h"
  47
  48 #define max(x,y) (((x)>(y)) ? (x) : (y))
  49
  50 static int audioCallback(const void *ibuf, void *obuf, unsigned long frames, const PaStreamCallbackTimeInfo*,  PaStreamCallbackFlags, void * drv);
  51 //----------------------------------------------------------------------------
  52 static void pa_error(int err)
  53 {
  54         if (err != paNoError) {
  55                 printf(  "PortAudio error: %s\n", Pa_GetErrorText( err ) );
  56         }
  57 }
  58
  59 /******************************************************************************
  60 *******************************************************************************
  61
  62                                                         PORT AUDIO INTERFACE
  63
  64 *******************************************************************************
  65 *******************************************************************************/
  66 class portaudio : public audio {
  67
  68         dsp*                    fDsp;
  69         PaStream*               fAudioStream;
  70         long fSampleRate, fBufferSize;
  71         //----------------------------------------------------------------------------
  72         //      number of physical input and output channels of the PA device
  73         //----------------------------------------------------------------------------
  74         int             fDevNumInChans;
  75         int             fDevNumOutChans;
  76
  77         //----------------------------------------------------------------------------
  78         // tables of noninterleaved input and output channels for FAUST
  79         //----------------------------------------------------------------------------
  80         float*  fInChannel[256];
  81         float*  fOutChannel[256];
  82
  83         //----------------------------------------------------------------------------
  84         // allocated the noninterleaved input and output channels for FAUST
  85         //----------------------------------------------------------------------------
  86         void allocChannels (int size, int numInChan, int numOutChan)
  87         {
  88             assert (numInChan < 256);
  89             assert (numOutChan < 256);
  90
  91             for (int i = 0; i < numInChan; i++) {
  92                 fInChannel[i] = (float*) calloc (size, sizeof(float));
  93                 for (int j = 0; j < size; j++)
  94                     fInChannel[i][j] = 0.0;
  95             }
  96
  97             for (int i = 0; i < numOutChan; i++) {
  98                 fOutChannel[i] = (float*) calloc (size, sizeof(float));
  99                 for (int j = 0; j < size; j++)
 100                     fOutChannel[i][j] = 0.0;
 101             }
 102         }
 103
 104         public:
 105                          portaudio(long srate, long bsize) : fDsp(0), fAudioStream(0),
 106                                 fSampleRate(srate), fBufferSize(bsize), fDevNumInChans(0), fDevNumOutChans(0) {}
 107         virtual ~portaudio() { stop(); }
 108
 109         virtual bool init(const char* name, dsp* DSP){
 110                 fDsp = DSP;
 111                 pa_error(Pa_Initialize());
 112
 113                 const PaDeviceInfo*     idev = Pa_GetDeviceInfo(Pa_GetDefaultInputDevice());
 114                 const PaDeviceInfo*     odev = Pa_GetDeviceInfo(Pa_GetDefaultOutputDevice());
 115
 116                 fDevNumInChans = (fDsp->getNumInputs() > 0) ? idev->maxInputChannels : 0 ;
 117                 fDevNumOutChans = (fDsp->getNumOutputs() > 0) ? odev->maxOutputChannels : 0;
 118
 119                 PaStreamParameters inputParameters;
 120                 PaStreamParameters outputParameters;
 121
 122                 inputParameters.device = Pa_GetDefaultInputDevice();
 123                 inputParameters.sampleFormat = paFloat32;
 124                 inputParameters.channelCount = fDevNumInChans;
 125                 inputParameters.hostApiSpecificStreamInfo = 0;
 126
 127                 outputParameters.device = Pa_GetDefaultOutputDevice();
 128                 outputParameters.sampleFormat = paFloat32;
 129                 outputParameters.channelCount = fDevNumOutChans;
 130                 outputParameters.hostApiSpecificStreamInfo = 0;
 131
 132                 PaError err;
 133                 if ((err = Pa_IsFormatSupported(
 134                         ((fDevNumInChans > 0) ? &inputParameters : 0),
 135                         ((fDevNumOutChans > 0) ? &outputParameters : 0), fSampleRate)) != 0) {
 136                         printf("stream format is not supported err = %d\n", err);
 137                         return false;
 138                 }
 139
 140                 allocChannels(fBufferSize, max(fDevNumInChans, fDsp->getNumInputs()), max(fDevNumOutChans, fDsp->getNumOutputs()));
 141                 fDsp->init(fSampleRate);
 142                 return true;
 143         }
 144
 145         virtual bool start() {
 146                 pa_error(Pa_OpenDefaultStream(&fAudioStream, fDevNumInChans, fDevNumOutChans, paFloat32, fSampleRate, fBufferSize, audioCallback, this));
 147                 Pa_StartStream(fAudioStream);
 148                 return true;
 149         }
 150
 151         virtual void stop() {
 152                 if (fAudioStream) {
 153                         Pa_StopStream (fAudioStream);
 154                         Pa_CloseStream(fAudioStream);
 155                         fAudioStream = 0;
 156                 }
 157         }
 158
 159         int processAudio(const float *ibuf, float *obuf, unsigned long frames) {
 160                 const float* fInputBuffer = ibuf;
 161                 float* fOutputBuffer = obuf;
 162
 163                 // split input samples
 164                 for (unsigned long s = 0; s < frames; s++) {
 165                         for (int c = 0; c < fDevNumInChans; c++) {
 166                                 fInChannel[c][s] = fInputBuffer[c + s*fDevNumInChans];
 167                         }
 168                 }
 169
 170                 // process samples
 171                 fDsp->compute(frames, fInChannel, fOutChannel);
 172
 173                 // merge output samples
 174                 for (unsigned long s = 0; s < frames; s++) {
 175                         for (int c = 0; c < fDevNumOutChans; c++) {
 176                                 fOutputBuffer[c + s*fDevNumOutChans] = fOutChannel[c][s];
 177                         }
 178                 }
 179                 return 0;
 180         }
 181 };
 182
 183 //----------------------------------------------------------------------------
 184 // Port Audio Callback
 185 //----------------------------------------------------------------------------
 186 static int audioCallback(const void *ibuf, void *obuf, unsigned long frames, const PaStreamCallbackTimeInfo*,  PaStreamCallbackFlags, void * drv)
 187 {
 188         portaudio * pa = (portaudio*) drv;
 189         return pa->processAudio ((const float*)ibuf, (float*)obuf, frames);
 190 }
 191
 192 #endif