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Diffstat (limited to 'portaudio/test/patest_prime.c')
| -rw-r--r-- | portaudio/test/patest_prime.c | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/portaudio/test/patest_prime.c b/portaudio/test/patest_prime.c new file mode 100644 index 0000000..e943310 --- /dev/null +++ b/portaudio/test/patest_prime.c @@ -0,0 +1,234 @@ +/** @file patest_prime.c + @ingroup test_src + @brief Test stream priming mode. + @author Ross Bencina http://www.audiomulch.com/~rossb +*/ + +/* + * $Id$ + * + * This program uses the PortAudio Portable Audio Library. + * For more information see: http://www.portaudio.com + * 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. + * + * 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. + */ + +/* + * The text above constitutes the entire PortAudio license; however, + * the PortAudio community also makes the following non-binding requests: + * + * 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. It is also + * requested that these non-binding requests be included along with the + * license above. + */ + +#include <stdio.h> +#include <math.h> +#include "portaudio.h" +#include "pa_util.h" + +#define NUM_BEEPS (3) +#define SAMPLE_RATE (44100) +#define SAMPLE_PERIOD (1.0/44100.0) +#define FRAMES_PER_BUFFER (256) +#define BEEP_DURATION (400) +#define IDLE_DURATION (SAMPLE_RATE*2) /* 2 seconds */ +#define SLEEP_MSEC (50) + +#define STATE_BKG_IDLE (0) +#define STATE_BKG_BEEPING (1) + +typedef struct +{ + float leftPhase; + float rightPhase; + int state; + int beepCountdown; + int idleCountdown; +} +paTestData; + +static void InitializeTestData( paTestData *testData ) +{ + testData->leftPhase = 0; + testData->rightPhase = 0; + testData->state = STATE_BKG_BEEPING; + testData->beepCountdown = BEEP_DURATION; + testData->idleCountdown = IDLE_DURATION; +} + +/* 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( const void *inputBuffer, void *outputBuffer, + unsigned long framesPerBuffer, + const PaStreamCallbackTimeInfo *timeInfo, + PaStreamCallbackFlags statusFlags, void *userData ) +{ + /* Cast data passed through stream to our structure. */ + paTestData *data = (paTestData*)userData; + float *out = (float*)outputBuffer; + unsigned int i; + int result = paContinue; + + /* suppress unused parameter warnings */ + (void) inputBuffer; + (void) timeInfo; + (void) statusFlags; + + for( i=0; i<framesPerBuffer; i++ ) + { + switch( data->state ) + { + case STATE_BKG_IDLE: + *out++ = 0.0; /* left */ + *out++ = 0.0; /* right */ + --data->idleCountdown; + + if( data->idleCountdown <= 0 ) result = paComplete; + break; + + case STATE_BKG_BEEPING: + if( data->beepCountdown <= 0 ) + { + data->state = STATE_BKG_IDLE; + *out++ = 0.0; /* left */ + *out++ = 0.0; /* right */ + } + else + { + /* Play sawtooth wave. */ + *out++ = data->leftPhase; /* left */ + *out++ = data->rightPhase; /* right */ + /* Generate simple sawtooth phaser that ranges between -1.0 and 1.0. */ + data->leftPhase += 0.01f; + /* When signal reaches top, drop back down. */ + if( data->leftPhase >= 1.0f ) data->leftPhase -= 2.0f; + /* higher pitch so we can distinguish left and right. */ + data->rightPhase += 0.03f; + if( data->rightPhase >= 1.0f ) data->rightPhase -= 2.0f; + } + --data->beepCountdown; + break; + } + } + + return result; +} + +/*******************************************************************/ +static PaError DoTest( int flags ) +{ + PaStream *stream; + PaError err = paNoError; + paTestData data; + PaStreamParameters outputParameters; + + InitializeTestData( &data ); + + outputParameters.device = Pa_GetDefaultOutputDevice(); + if (outputParameters.device == paNoDevice) { + fprintf(stderr,"Error: No default output device.\n"); + goto error; + } + outputParameters.channelCount = 2; + outputParameters.hostApiSpecificStreamInfo = NULL; + outputParameters.sampleFormat = paFloat32; + outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultHighOutputLatency; + + /* Open an audio I/O stream. */ + err = Pa_OpenStream( + &stream, + NULL, /* no input */ + &outputParameters, + SAMPLE_RATE, + FRAMES_PER_BUFFER, /* frames per buffer */ + paClipOff | flags, /* 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("hear \"BEEP\"\n" ); + fflush(stdout); + + while( ( err = Pa_IsStreamActive( stream ) ) == 1 ) Pa_Sleep(SLEEP_MSEC); + if( err < 0 ) goto error; + + err = Pa_StopStream( stream ); + if( err != paNoError ) goto error; + + err = Pa_CloseStream( stream ); + if( err != paNoError ) goto error; + + return err; +error: + return err; +} + +/*******************************************************************/ +int main(void); +int main(void) +{ + PaError err = paNoError; + int i; + + /* Initialize library before making any other calls. */ + err = Pa_Initialize(); + if( err != paNoError ) goto error; + + printf("PortAudio Test: Testing stream playback with no priming.\n"); + printf("PortAudio Test: you should see BEEP before you hear it.\n"); + printf("BEEP %d times.\n", NUM_BEEPS ); + + for( i=0; i< NUM_BEEPS; ++i ) + { + err = DoTest( 0 ); + if( err != paNoError ) + goto error; + } + + printf("PortAudio Test: Testing stream playback with priming.\n"); + printf("PortAudio Test: you should see BEEP around the same time you hear it.\n"); + for( i=0; i< NUM_BEEPS; ++i ) + { + err = DoTest( paPrimeOutputBuffersUsingStreamCallback ); + if( err != paNoError ) + goto error; + } + + printf("Test finished.\n"); + + Pa_Terminate(); + return err; +error: + Pa_Terminate(); + fprintf( stderr, "An error occurred while using the portaudio stream\n" ); + fprintf( stderr, "Error number: %d\n", err ); + fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); + return err; +} |