cannam@124: /** @file patest_stop.c cannam@124: @ingroup test_src cannam@124: @brief Test different ways of stopping audio. cannam@124: cannam@124: Test the three ways of stopping audio: cannam@124: - calling Pa_StopStream(), cannam@124: - calling Pa_AbortStream(), cannam@124: - and returning a 1 from the callback function. cannam@124: cannam@124: A long latency is set up so that you can hear the difference. cannam@124: Then a simple 8 note sequence is repeated twice. cannam@124: The program will print what you should hear. cannam@124: cannam@124: @author Phil Burk cannam@124: */ cannam@124: /* cannam@124: * $Id: patest_stop.c 1368 2008-03-01 00:38:27Z rossb $ cannam@124: * cannam@124: * This program uses the PortAudio Portable Audio Library. cannam@124: * For more information see: http://www.portaudio.com cannam@124: * Copyright (c) 1999-2000 Ross Bencina and Phil Burk cannam@124: * cannam@124: * Permission is hereby granted, free of charge, to any person obtaining cannam@124: * a copy of this software and associated documentation files cannam@124: * (the "Software"), to deal in the Software without restriction, cannam@124: * including without limitation the rights to use, copy, modify, merge, cannam@124: * publish, distribute, sublicense, and/or sell copies of the Software, cannam@124: * and to permit persons to whom the Software is furnished to do so, cannam@124: * subject to the following conditions: cannam@124: * cannam@124: * The above copyright notice and this permission notice shall be cannam@124: * included in all copies or substantial portions of the Software. cannam@124: * cannam@124: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, cannam@124: * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF cannam@124: * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. cannam@124: * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR cannam@124: * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF cannam@124: * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION cannam@124: * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. cannam@124: */ cannam@124: cannam@124: /* cannam@124: * The text above constitutes the entire PortAudio license; however, cannam@124: * the PortAudio community also makes the following non-binding requests: cannam@124: * cannam@124: * Any person wishing to distribute modifications to the Software is cannam@124: * requested to send the modifications to the original developer so that cannam@124: * they can be incorporated into the canonical version. It is also cannam@124: * requested that these non-binding requests be included along with the cannam@124: * license above. cannam@124: */ cannam@124: #include cannam@124: #include cannam@124: #include "portaudio.h" cannam@124: cannam@124: #define OUTPUT_DEVICE (Pa_GetDefaultOutputDevice()) cannam@124: #define SLEEP_DUR (200) cannam@124: #define SAMPLE_RATE (44100) cannam@124: #define FRAMES_PER_BUFFER (256) cannam@124: #define LATENCY_SECONDS (3.f) cannam@124: #define FRAMES_PER_NOTE (SAMPLE_RATE/2) cannam@124: #define MAX_REPEATS (2) cannam@124: #define FUNDAMENTAL (400.0f / SAMPLE_RATE) cannam@124: #define NOTE_0 (FUNDAMENTAL * 1.0f / 1.0f) cannam@124: #define NOTE_1 (FUNDAMENTAL * 5.0f / 4.0f) cannam@124: #define NOTE_2 (FUNDAMENTAL * 4.0f / 3.0f) cannam@124: #define NOTE_3 (FUNDAMENTAL * 3.0f / 2.0f) cannam@124: #define NOTE_4 (FUNDAMENTAL * 2.0f / 1.0f) cannam@124: #define MODE_FINISH (0) cannam@124: #define MODE_STOP (1) cannam@124: #define MODE_ABORT (2) cannam@124: #ifndef M_PI cannam@124: #define M_PI (3.14159265) cannam@124: #endif cannam@124: #define TABLE_SIZE (400) cannam@124: cannam@124: typedef struct cannam@124: { cannam@124: float waveform[TABLE_SIZE + 1]; /* Add one for guard point for interpolation. */ cannam@124: float phase_increment; cannam@124: float phase; cannam@124: float *tune; cannam@124: int notesPerTune; cannam@124: int frameCounter; cannam@124: int noteCounter; cannam@124: int repeatCounter; cannam@124: PaTime outTime; cannam@124: int stopMode; cannam@124: int done; cannam@124: } cannam@124: paTestData; cannam@124: cannam@124: /************* Prototypes *****************************/ cannam@124: int TestStopMode( paTestData *data ); cannam@124: float LookupWaveform( paTestData *data, float phase ); cannam@124: cannam@124: /****************************************************** cannam@124: * Convert phase between 0.0 and 1.0 to waveform value cannam@124: * using linear interpolation. cannam@124: */ cannam@124: float LookupWaveform( paTestData *data, float phase ) cannam@124: { cannam@124: float fIndex = phase*TABLE_SIZE; cannam@124: int index = (int) fIndex; cannam@124: float fract = fIndex - index; cannam@124: float lo = data->waveform[index]; cannam@124: float hi = data->waveform[index+1]; cannam@124: float val = lo + fract*(hi-lo); cannam@124: return val; cannam@124: } cannam@124: cannam@124: /* This routine will be called by the PortAudio engine when audio is needed. cannam@124: ** It may called at interrupt level on some machines so don't do anything cannam@124: ** that could mess up the system like calling malloc() or free(). cannam@124: */ cannam@124: static int patestCallback( const void *inputBuffer, void *outputBuffer, cannam@124: unsigned long framesPerBuffer, cannam@124: const PaStreamCallbackTimeInfo* timeInfo, cannam@124: PaStreamCallbackFlags statusFlags, cannam@124: void *userData ) cannam@124: { cannam@124: paTestData *data = (paTestData*)userData; cannam@124: float *out = (float*)outputBuffer; cannam@124: float value; cannam@124: unsigned int i = 0; cannam@124: int finished = paContinue; cannam@124: cannam@124: (void) inputBuffer; /* Prevent unused variable warnings. */ cannam@124: (void) timeInfo; cannam@124: (void) statusFlags; cannam@124: cannam@124: cannam@124: /* data->outTime = outTime; */ cannam@124: cannam@124: if( !data->done ) cannam@124: { cannam@124: for( i=0; iframeCounter >= FRAMES_PER_NOTE ) cannam@124: { cannam@124: data->noteCounter += 1; cannam@124: data->frameCounter = 0; cannam@124: /* Are we done with this tune? */ cannam@124: if( data->noteCounter >= data->notesPerTune ) cannam@124: { cannam@124: data->noteCounter = 0; cannam@124: data->repeatCounter += 1; cannam@124: /* Are we totally done? */ cannam@124: if( data->repeatCounter >= MAX_REPEATS ) cannam@124: { cannam@124: data->done = 1; cannam@124: if( data->stopMode == MODE_FINISH ) cannam@124: { cannam@124: finished = paComplete; cannam@124: break; cannam@124: } cannam@124: } cannam@124: } cannam@124: data->phase_increment = data->tune[data->noteCounter]; cannam@124: } cannam@124: value = LookupWaveform(data, data->phase); cannam@124: *out++ = value; /* left */ cannam@124: *out++ = value; /* right */ cannam@124: data->phase += data->phase_increment; cannam@124: if( data->phase >= 1.0f ) data->phase -= 1.0f; cannam@124: cannam@124: data->frameCounter += 1; cannam@124: } cannam@124: } cannam@124: /* zero remainder of final buffer */ cannam@124: for( ; idone = 0; cannam@124: data->phase = 0.0; cannam@124: data->frameCounter = 0; cannam@124: data->noteCounter = 0; cannam@124: data->repeatCounter = 0; cannam@124: data->phase_increment = data->tune[data->noteCounter]; cannam@124: cannam@124: err = Pa_Initialize(); cannam@124: if( err != paNoError ) goto error; cannam@124: cannam@124: outputParameters.device = OUTPUT_DEVICE; cannam@124: if (outputParameters.device == paNoDevice) { cannam@124: fprintf(stderr,"Error: No default output device.\n"); cannam@124: goto error; cannam@124: } cannam@124: outputParameters.channelCount = 2; /* stereo output */ cannam@124: outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */ cannam@124: outputParameters.suggestedLatency = LATENCY_SECONDS; cannam@124: outputParameters.hostApiSpecificStreamInfo = NULL; cannam@124: cannam@124: err = Pa_OpenStream( cannam@124: &stream, cannam@124: NULL, /* no input */ cannam@124: &outputParameters, cannam@124: SAMPLE_RATE, cannam@124: FRAMES_PER_BUFFER, /* frames per buffer */ cannam@124: paClipOff, /* we won't output out of range samples so don't bother clipping them */ cannam@124: patestCallback, cannam@124: data ); cannam@124: if( err != paNoError ) goto error; cannam@124: cannam@124: err = Pa_StartStream( stream ); cannam@124: if( err != paNoError ) goto error; cannam@124: cannam@124: if( data->stopMode == MODE_FINISH ) cannam@124: { cannam@124: while( ( err = Pa_IsStreamActive( stream ) ) == 1 ) cannam@124: { cannam@124: /*printf("outTime = %g, note# = %d, repeat# = %d\n", data->outTime, cannam@124: data->noteCounter, data->repeatCounter ); cannam@124: fflush(stdout); */ cannam@124: Pa_Sleep( SLEEP_DUR ); cannam@124: } cannam@124: if( err < 0 ) goto error; cannam@124: } cannam@124: else cannam@124: { cannam@124: while( data->repeatCounter < MAX_REPEATS ) cannam@124: { cannam@124: /*printf("outTime = %g, note# = %d, repeat# = %d\n", data->outTime, cannam@124: data->noteCounter, data->repeatCounter ); cannam@124: fflush(stdout); */ cannam@124: Pa_Sleep( SLEEP_DUR ); cannam@124: } cannam@124: } cannam@124: cannam@124: if( data->stopMode == MODE_ABORT ) cannam@124: { cannam@124: printf("Call Pa_AbortStream()\n"); cannam@124: err = Pa_AbortStream( stream ); cannam@124: } cannam@124: else cannam@124: { cannam@124: printf("Call Pa_StopStream()\n"); cannam@124: err = Pa_StopStream( stream ); cannam@124: } cannam@124: if( err != paNoError ) goto error; cannam@124: cannam@124: printf("Call Pa_CloseStream()\n"); fflush(stdout); cannam@124: err = Pa_CloseStream( stream ); cannam@124: if( err != paNoError ) goto error; cannam@124: cannam@124: Pa_Terminate(); cannam@124: printf("Test finished.\n"); cannam@124: cannam@124: return err; cannam@124: cannam@124: error: cannam@124: Pa_Terminate(); cannam@124: fprintf( stderr, "An error occured while using the portaudio stream\n" ); cannam@124: fprintf( stderr, "Error number: %d\n", err ); cannam@124: fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); cannam@124: return err; cannam@124: }