211 lines
7 KiB
C
211 lines
7 KiB
C
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/** @file paex_wmme_surround.c
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@ingroup examples_src
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@brief Use WMME-specific channelMask to request 5.1 surround sound output.
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@author Ross Bencina <rossb@audiomulch.com>
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*/
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/*
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* $Id: $
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* Portable Audio I/O Library
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* Windows MME surround sound output test
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*
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* Copyright (c) 2007 Ross Bencina
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
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* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* The text above constitutes the entire PortAudio license; however,
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* the PortAudio community also makes the following non-binding requests:
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*
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* Any person wishing to distribute modifications to the Software is
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* requested to send the modifications to the original developer so that
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* they can be incorporated into the canonical version. It is also
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* requested that these non-binding requests be included along with the
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* license above.
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*/
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#include <stdio.h>
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#include <math.h>
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#include <windows.h> /* required when using pa_win_wmme.h */
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#include <mmsystem.h> /* required when using pa_win_wmme.h */
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#include "portaudio.h"
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#include "pa_win_wmme.h"
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#define NUM_SECONDS (12)
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#define SAMPLE_RATE (44100)
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#define FRAMES_PER_BUFFER (64)
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#ifndef M_PI
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#define M_PI (3.14159265)
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#endif
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#define TABLE_SIZE (100)
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#define CHANNEL_COUNT (6)
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typedef struct
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{
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float sine[TABLE_SIZE];
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int phase;
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int currentChannel;
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int cycleCount;
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}
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paTestData;
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/* This routine will be called by the PortAudio engine when audio is needed.
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** It may called at interrupt level on some machines so don't do anything
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** that could mess up the system like calling malloc() or free().
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*/
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static int patestCallback( const void *inputBuffer, void *outputBuffer,
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unsigned long framesPerBuffer,
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const PaStreamCallbackTimeInfo* timeInfo,
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PaStreamCallbackFlags statusFlags,
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void *userData )
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{
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paTestData *data = (paTestData*)userData;
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float *out = (float*)outputBuffer;
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unsigned long i,j;
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(void) timeInfo; /* Prevent unused variable warnings. */
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(void) statusFlags;
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(void) inputBuffer;
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for( i=0; i<framesPerBuffer; i++ )
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{
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for( j = 0; j < CHANNEL_COUNT; ++j ){
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if( j == data->currentChannel && data->cycleCount < 4410 ){
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*out++ = data->sine[data->phase];
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data->phase += 1 + j; // play each channel at a different pitch so they can be distinguished
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if( data->phase >= TABLE_SIZE ){
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data->phase -= TABLE_SIZE;
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}
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}else{
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*out++ = 0;
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}
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}
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data->cycleCount++;
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if( data->cycleCount > 44100 ){
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data->cycleCount = 0;
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++data->currentChannel;
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if( data->currentChannel >= CHANNEL_COUNT )
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data->currentChannel -= CHANNEL_COUNT;
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}
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}
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return paContinue;
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}
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/*******************************************************************/
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int main(int argc, char* argv[])
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{
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PaStreamParameters outputParameters;
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PaWinMmeStreamInfo wmmeStreamInfo;
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PaStream *stream;
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PaError err;
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paTestData data;
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int i;
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int deviceIndex;
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printf("PortAudio Test: output a sine blip on each channel. SR = %d, BufSize = %d, Chans = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER, CHANNEL_COUNT);
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err = Pa_Initialize();
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if( err != paNoError ) goto error;
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deviceIndex = Pa_GetHostApiInfo( Pa_HostApiTypeIdToHostApiIndex( paMME ) )->defaultOutputDevice;
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if( argc == 2 ){
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sscanf( argv[1], "%d", &deviceIndex );
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}
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printf( "using device id %d (%s)\n", deviceIndex, Pa_GetDeviceInfo(deviceIndex)->name );
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/* initialise sinusoidal wavetable */
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for( i=0; i<TABLE_SIZE; i++ )
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{
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data.sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. );
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}
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data.phase = 0;
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data.currentChannel = 0;
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data.cycleCount = 0;
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outputParameters.device = deviceIndex;
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outputParameters.channelCount = CHANNEL_COUNT;
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outputParameters.sampleFormat = paFloat32; /* 32 bit floating point processing */
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outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
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outputParameters.hostApiSpecificStreamInfo = NULL;
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/* it's not strictly necessary to provide a channelMask for surround sound
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output. But if you want to be sure which channel mask PortAudio will use
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then you should supply one */
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wmmeStreamInfo.size = sizeof(PaWinMmeStreamInfo);
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wmmeStreamInfo.hostApiType = paMME;
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wmmeStreamInfo.version = 1;
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wmmeStreamInfo.flags = paWinMmeUseChannelMask;
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wmmeStreamInfo.channelMask = PAWIN_SPEAKER_5POINT1; /* request 5.1 output format */
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outputParameters.hostApiSpecificStreamInfo = &wmmeStreamInfo;
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if( Pa_IsFormatSupported( 0, &outputParameters, SAMPLE_RATE ) == paFormatIsSupported ){
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printf( "Pa_IsFormatSupported reports device will support %d channels.\n", CHANNEL_COUNT );
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}else{
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printf( "Pa_IsFormatSupported reports device will not support %d channels.\n", CHANNEL_COUNT );
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}
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err = Pa_OpenStream(
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&stream,
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NULL, /* no input */
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&outputParameters,
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SAMPLE_RATE,
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FRAMES_PER_BUFFER,
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paClipOff, /* we won't output out of range samples so don't bother clipping them */
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patestCallback,
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&data );
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if( err != paNoError ) goto error;
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err = Pa_StartStream( stream );
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if( err != paNoError ) goto error;
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printf("Play for %d seconds.\n", NUM_SECONDS );
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Pa_Sleep( NUM_SECONDS * 1000 );
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err = Pa_StopStream( stream );
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if( err != paNoError ) goto error;
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err = Pa_CloseStream( stream );
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if( err != paNoError ) goto error;
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Pa_Terminate();
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printf("Test finished.\n");
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return err;
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error:
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Pa_Terminate();
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fprintf( stderr, "An error occurred while using the portaudio stream\n" );
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fprintf( stderr, "Error number: %d\n", err );
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fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
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return err;
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}
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