cannam@89: /** @file patest_write_stop.c cannam@89: @brief Play a few seconds of silence followed by a few cycles of a sine wave. Tests to make sure that pa_StopStream() completes playback in blocking I/O cannam@89: @author Bjorn Roche of XO Audio (www.xoaudio.com) cannam@89: @author Ross Bencina cannam@89: @author Phil Burk cannam@89: */ cannam@89: /* cannam@89: * $Id: patest_write_stop.c 1083 2006-08-23 07:30:49Z rossb $ cannam@89: * cannam@89: * This program uses the PortAudio Portable Audio Library. cannam@89: * For more information see: http://www.portaudio.com/ cannam@89: * Copyright (c) 1999-2000 Ross Bencina and Phil Burk cannam@89: * cannam@89: * Permission is hereby granted, free of charge, to any person obtaining cannam@89: * a copy of this software and associated documentation files cannam@89: * (the "Software"), to deal in the Software without restriction, cannam@89: * including without limitation the rights to use, copy, modify, merge, cannam@89: * publish, distribute, sublicense, and/or sell copies of the Software, cannam@89: * and to permit persons to whom the Software is furnished to do so, cannam@89: * subject to the following conditions: cannam@89: * cannam@89: * The above copyright notice and this permission notice shall be cannam@89: * included in all copies or substantial portions of the Software. cannam@89: * cannam@89: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, cannam@89: * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF cannam@89: * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. cannam@89: * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR cannam@89: * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF cannam@89: * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION cannam@89: * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. cannam@89: */ cannam@89: cannam@89: /* cannam@89: * The text above constitutes the entire PortAudio license; however, cannam@89: * the PortAudio community also makes the following non-binding requests: cannam@89: * cannam@89: * Any person wishing to distribute modifications to the Software is cannam@89: * requested to send the modifications to the original developer so that cannam@89: * they can be incorporated into the canonical version. It is also cannam@89: * requested that these non-binding requests be included along with the cannam@89: * license above. cannam@89: */ cannam@89: cannam@89: #include cannam@89: #include cannam@89: #include "portaudio.h" cannam@89: cannam@89: #define NUM_SECONDS (5) cannam@89: #define SAMPLE_RATE (44100) cannam@89: #define FRAMES_PER_BUFFER (1024) cannam@89: cannam@89: #ifndef M_PI cannam@89: #define M_PI (3.14159265) cannam@89: #endif cannam@89: cannam@89: #define TABLE_SIZE (200) cannam@89: cannam@89: cannam@89: int main(void); cannam@89: int main(void) cannam@89: { cannam@89: PaStreamParameters outputParameters; cannam@89: PaStream *stream; cannam@89: PaError err; cannam@89: float buffer[FRAMES_PER_BUFFER][2]; /* stereo output buffer */ cannam@89: float sine[TABLE_SIZE]; /* sine wavetable */ cannam@89: int left_phase = 0; cannam@89: int right_phase = 0; cannam@89: int left_inc = 1; cannam@89: int right_inc = 3; /* higher pitch so we can distinguish left and right. */ cannam@89: int i, j; cannam@89: int bufferCount; cannam@89: const int framesBy2 = FRAMES_PER_BUFFER >> 1; cannam@89: const float framesBy2f = (float) framesBy2 ; cannam@89: cannam@89: cannam@89: printf( "PortAudio Test: output silence, followed by one buffer of a ramped sine wave. SR = %d, BufSize = %d\n", cannam@89: SAMPLE_RATE, FRAMES_PER_BUFFER); cannam@89: cannam@89: /* initialise sinusoidal wavetable */ cannam@89: for( i=0; idefaultHighOutputLatency * 5; cannam@89: outputParameters.hostApiSpecificStreamInfo = NULL; cannam@89: cannam@89: /* open the stream */ cannam@89: err = Pa_OpenStream( cannam@89: &stream, cannam@89: NULL, /* no input */ cannam@89: &outputParameters, cannam@89: SAMPLE_RATE, cannam@89: FRAMES_PER_BUFFER, cannam@89: paClipOff, /* we won't output out of range samples so don't bother clipping them */ cannam@89: NULL, /* no callback, use blocking API */ cannam@89: NULL ); /* no callback, so no callback userData */ cannam@89: if( err != paNoError ) goto error; cannam@89: cannam@89: /* start the stream */ cannam@89: err = Pa_StartStream( stream ); cannam@89: if( err != paNoError ) goto error; cannam@89: cannam@89: printf("Playing %d seconds of silence followed by one buffer of a ramped sinusoid.\n", NUM_SECONDS ); cannam@89: cannam@89: bufferCount = ((NUM_SECONDS * SAMPLE_RATE) / FRAMES_PER_BUFFER); cannam@89: cannam@89: /* clear buffer */ cannam@89: for( j=0; j < FRAMES_PER_BUFFER; j++ ) cannam@89: { cannam@89: buffer[j][0] = 0; /* left */ cannam@89: buffer[j][1] = 0; /* right */ cannam@89: } cannam@89: /* play the silent buffer a bunch o' times */ cannam@89: for( i=0; i < bufferCount; i++ ) cannam@89: { cannam@89: err = Pa_WriteStream( stream, buffer, FRAMES_PER_BUFFER ); cannam@89: if( err != paNoError ) goto error; cannam@89: } cannam@89: /* play a non-silent buffer once */ cannam@89: for( j=0; j < FRAMES_PER_BUFFER; j++ ) cannam@89: { cannam@89: float ramp = 1; cannam@89: if( j < framesBy2 ) cannam@89: ramp = j / framesBy2f; cannam@89: else cannam@89: ramp = (FRAMES_PER_BUFFER - j) / framesBy2f ; cannam@89: cannam@89: buffer[j][0] = sine[left_phase] * ramp; /* left */ cannam@89: buffer[j][1] = sine[right_phase] * ramp; /* right */ cannam@89: left_phase += left_inc; cannam@89: if( left_phase >= TABLE_SIZE ) left_phase -= TABLE_SIZE; cannam@89: right_phase += right_inc; cannam@89: if( right_phase >= TABLE_SIZE ) right_phase -= TABLE_SIZE; cannam@89: } cannam@89: err = Pa_WriteStream( stream, buffer, FRAMES_PER_BUFFER ); cannam@89: if( err != paNoError ) goto error; cannam@89: cannam@89: /* stop stream, close, and terminate */ cannam@89: err = Pa_StopStream( stream ); cannam@89: if( err != paNoError ) goto error; cannam@89: cannam@89: err = Pa_CloseStream( stream ); cannam@89: if( err != paNoError ) goto error; cannam@89: cannam@89: Pa_Terminate(); cannam@89: printf("Test finished.\n"); cannam@89: cannam@89: return err; cannam@89: error: cannam@89: Pa_Terminate(); cannam@89: fprintf( stderr, "An error occured while using the portaudio stream\n" ); cannam@89: fprintf( stderr, "Error number: %d\n", err ); cannam@89: fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); cannam@89: return err; cannam@89: }