diff options
Diffstat (limited to 'pd/portaudio_v18/pa_tests/patest_leftright.c')
-rw-r--r-- | pd/portaudio_v18/pa_tests/patest_leftright.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/pd/portaudio_v18/pa_tests/patest_leftright.c b/pd/portaudio_v18/pa_tests/patest_leftright.c new file mode 100644 index 00000000..6e6172ac --- /dev/null +++ b/pd/portaudio_v18/pa_tests/patest_leftright.c @@ -0,0 +1,168 @@ +/* + * $Id: patest_leftright.c,v 1.2 2002/02/22 21:46:18 philburk Exp $ + * patest_leftright.c + * Play different tone sine waves that alternate between left and right channel. + * The low tone should be on the left channel. + * + * Authors: + * Ross Bencina <rossb@audiomulch.com> + * Phil Burk <philburk@softsynth.com> + * + * This program uses the PortAudio Portable Audio Library. + * For more information see: http://www.audiomulch.com/portaudio/ + * Copyright (c) 1999-2000 Ross Bencina and Phil Burk + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files + * (the "Software"), to deal in the Software without restriction, + * including without limitation the rights to use, copy, modify, merge, + * publish, distribute, sublicense, and/or sell copies of the Software, + * and to permit persons to whom the Software is furnished to do so, + * subject to the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * Any person wishing to distribute modifications to the Software is + * requested to send the modifications to the original developer so that + * they can be incorporated into the canonical version. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. + * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR + * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF + * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + * + */ +#include <stdio.h> +#include <math.h> +#include "portaudio.h" +#define NUM_SECONDS (8) +#define SAMPLE_RATE (44100) +#define FRAMES_PER_BUFFER (512) +#ifndef M_PI +#define M_PI (3.14159265) +#endif +#define TABLE_SIZE (200) +typedef struct +{ + float sine[TABLE_SIZE]; + int left_phase; + int right_phase; + int toggle; + int countDown; +} +paTestData; +/* This routine will be called by the PortAudio engine when audio is needed. +** It may called at interrupt level on some machines so don't do anything +** that could mess up the system like calling malloc() or free(). +*/ +static int patestCallback( void *inputBuffer, void *outputBuffer, + unsigned long framesPerBuffer, + PaTimestamp outTime, void *userData ) +{ + paTestData *data = (paTestData*)userData; + float *out = (float*)outputBuffer; + unsigned long i; + int finished = 0; + (void) outTime; /* Prevent unused variable warnings. */ + (void) inputBuffer; + + for( i=0; i<framesPerBuffer; i++ ) + { + if( data->toggle ) + { + *out++ = data->sine[data->left_phase]; /* left */ + *out++ = 0; /* right */ + } + else + { + *out++ = 0; /* left */ + *out++ = data->sine[data->right_phase]; /* right */ + } + + data->left_phase += 1; + if( data->left_phase >= TABLE_SIZE ) data->left_phase -= TABLE_SIZE; + data->right_phase += 3; /* higher pitch so we can distinguish left and right. */ + if( data->right_phase >= TABLE_SIZE ) data->right_phase -= TABLE_SIZE; + } + + if( data->countDown < 0 ) + { + data->countDown = SAMPLE_RATE; + data->toggle = !data->toggle; + } + data->countDown -= framesPerBuffer; + + return finished; +} + +/*******************************************************************/ +int main(void); +int main(void) +{ + PortAudioStream *stream; + PaError err; + paTestData data; + int i; + int timeout; + + printf("Play different tone sine waves that alternate between left and right channel.\n"); + printf("The low tone should be on the left channel.\n"); + + /* initialise sinusoidal wavetable */ + for( i=0; i<TABLE_SIZE; i++ ) + { + data.sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. ); + } + data.left_phase = data.right_phase = data.toggle = 0; + data.countDown = SAMPLE_RATE; + + err = Pa_Initialize(); + if( err != paNoError ) goto error; + + err = Pa_OpenStream( + &stream, + paNoDevice,/* default input device */ + 0, /* no input */ + paFloat32, /* 32 bit floating point input */ + NULL, + Pa_GetDefaultOutputDeviceID(), /* default output device */ + 2, /* stereo output */ + paFloat32, /* 32 bit floating point output */ + NULL, + SAMPLE_RATE, + FRAMES_PER_BUFFER, /* frames per buffer */ + 0, /* number of buffers, if zero then use default minimum */ + paClipOff, /* we won't output out of range samples so don't bother clipping them */ + patestCallback, + &data ); + if( err != paNoError ) goto error; + + err = Pa_StartStream( stream ); + if( err != paNoError ) goto error; + + printf("Play for several seconds.\n"); + timeout = NUM_SECONDS * 4; + while( timeout > 0 ) + { + Pa_Sleep( 300 ); + timeout -= 1; + } + + err = Pa_StopStream( stream ); + if( err != paNoError ) goto error; + err = Pa_CloseStream( stream ); + if( err != paNoError ) goto error; + Pa_Terminate(); + printf("Test finished.\n"); + return err; +error: + Pa_Terminate(); + fprintf( stderr, "An error occured while using the portaudio stream\n" ); + fprintf( stderr, "Error number: %d\n", err ); + fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); + return err; +} |