CLAM-Development
1.1
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00001 /* 00002 * Copyright (c) 2004 MUSIC TECHNOLOGY GROUP (MTG) 00003 * UNIVERSITAT POMPEU FABRA 00004 * 00005 * 00006 * This program is free software; you can redistribute it and/or modify 00007 * it under the terms of the GNU General Public License as published by 00008 * the Free Software Foundation; either version 2 of the License, or 00009 * (at your option) any later version. 00010 * 00011 * This program is distributed in the hope that it will be useful, 00012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 * GNU General Public License for more details. 00015 * 00016 * You should have received a copy of the GNU General Public License 00017 * along with this program; if not, write to the Free Software 00018 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 00019 * 00020 */ 00021 00022 #include <portaudio.h> 00023 #include "PAAudioOutputStream.hxx" 00024 #include "PortAudioUtils.hxx" 00025 #include "Assert.hxx" 00026 00027 namespace CLAM 00028 { 00029 00030 void PAAudioOutputStream::SetupStream() 00031 { 00032 PaError errval; 00033 00034 // CheckConsistency(); 00035 00036 errval = Pa_OpenStream( 00037 &mStream, 00038 paNoDevice, 00039 0, 00040 paInt16, 00041 NULL, 00042 mConfig.GetDeviceID(), 00043 mConfig.GetChannelNumber(), 00044 paInt16, 00045 NULL, 00046 mConfig.GetSampleRate(), 00047 mConfig.GetOutputDblBuffer()->GetSize()/mConfig.GetChannelNumber(), 00048 0, 00049 0, 00050 mConfig.GetCallback(), 00051 mConfig.GetOutputDblBuffer() ); 00052 00053 CHECK_PA_ERROR( "Error opening the stream: ", errval ); 00054 } 00055 00056 void PAAudioOutputStream::CheckConsistency() 00057 { 00058 const PaDeviceInfo* devnfo = Pa_GetDeviceInfo( mConfig.GetDeviceID() ); 00059 00060 if ( devnfo == NULL ) 00061 throw ErrPortAudio("Error opening stream\nThe device id is not valid"); 00062 00063 // MRJ: Let's check if the capabilities of the selected 00064 // device meet the requirements expressed in the stream 00065 // configuration object 00066 00067 // I don't like much this but I don't see clearly the 00068 // utility of using CLAM_ASSERT's beyond saving me 00069 // of typing the conditionals... 00070 00071 // Check number of channels 00072 if ( mConfig.GetChannelNumber() > devnfo->maxOutputChannels ) 00073 throw ErrPortAudio("Error opening the stream:\nNumber of output channels requested is not supported by the device\n" ); 00074 00075 // Check the sample rate. Let's determine wether 00076 // the requested sample rate is supported 00077 00078 unsigned supportedSr; 00079 bool isSupported = false; 00080 00081 for ( int k = devnfo->numSampleRates - 1; k >= 0; k-- ) 00082 { 00083 supportedSr = (unsigned)devnfo->sampleRates[k]; 00084 if ( mConfig.GetSampleRate() == supportedSr ) 00085 isSupported = true; 00086 } 00087 00088 // Requested sample rate is not supported 00089 if ( !isSupported ) 00090 throw ErrPortAudio( "Error opening the stream:\nRequested Sample rate not supported by the device" ); 00091 00092 // These ones are asserts 00093 CLAM_ASSERT( mConfig.GetDblBuffer()!=NULL, "The double buffer for the stream cannot be nil!" ); 00094 CLAM_ASSERT( mConfig.GetCallback()!=NULL, "The callback for the stream is nil!" ); 00095 } 00096 00097 } 00098