210 lines
6.8 KiB
C
210 lines
6.8 KiB
C
/*
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* $Id: debug_sine_formats.c 1083 2006-08-23 07:30:49Z rossb $
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* patest_sine_formats.c
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* Play a sine wave using the Portable Audio api for several seconds.
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* Test various data formats.
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*
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* Author: Phil Burk
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*
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* This program uses the PortAudio Portable Audio Library.
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* For more information see: http://www.portaudio.com
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* Copyright (c) 1999-2000 Ross Bencina and Phil Burk
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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 "portaudio.h"
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#define NUM_SECONDS (10)
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#define SAMPLE_RATE (44100)
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#define FRAMES_PER_BUFFER (256)
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#define LEFT_FREQ (SAMPLE_RATE/512.0) /* So we hit 1.0 */
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#define RIGHT_FREQ (500.0)
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#define AMPLITUDE (1.0)
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/* Select ONE format for testing. */
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#define TEST_UINT8 (1)
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#define TEST_INT8 (0)
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#define TEST_INT16 (0)
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#define TEST_FLOAT32 (0)
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#if TEST_UINT8
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#define TEST_FORMAT paUInt8
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typedef unsigned char SAMPLE_t;
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#define SAMPLE_ZERO (0x80)
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#define DOUBLE_TO_SAMPLE(x) (SAMPLE_ZERO + (SAMPLE_t)(127.0 * (x)))
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#define FORMAT_NAME "Unsigned 8 Bit"
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#elif TEST_INT8
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#define TEST_FORMAT paInt8
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typedef char SAMPLE_t;
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#define SAMPLE_ZERO (0)
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#define DOUBLE_TO_SAMPLE(x) (SAMPLE_ZERO + (SAMPLE_t)(127.0 * (x)))
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#define FORMAT_NAME "Signed 8 Bit"
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#elif TEST_INT16
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#define TEST_FORMAT paInt16
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typedef short SAMPLE_t;
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#define SAMPLE_ZERO (0)
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#define DOUBLE_TO_SAMPLE(x) (SAMPLE_ZERO + (SAMPLE_t)(32767 * (x)))
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#define FORMAT_NAME "Signed 16 Bit"
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#elif TEST_FLOAT32
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#define TEST_FORMAT paFloat32
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typedef float SAMPLE_t;
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#define SAMPLE_ZERO (0.0)
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#define DOUBLE_TO_SAMPLE(x) ((SAMPLE_t)(x))
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#define FORMAT_NAME "Float 32 Bit"
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#endif
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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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typedef struct
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{
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double left_phase;
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double right_phase;
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unsigned int framesToGo;
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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( void *inputBuffer, void *outputBuffer,
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unsigned long framesPerBuffer,
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PaTimestamp outTime, void *userData )
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{
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paTestData *data = (paTestData*)userData;
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SAMPLE_t *out = (SAMPLE_t *)outputBuffer;
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SAMPLE_t sample;
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int i;
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int framesToCalc;
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int finished = 0;
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(void) outTime; /* Prevent unused variable warnings. */
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(void) inputBuffer;
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if( data->framesToGo < framesPerBuffer )
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{
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framesToCalc = data->framesToGo;
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data->framesToGo = 0;
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finished = 1;
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}
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else
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{
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framesToCalc = framesPerBuffer;
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data->framesToGo -= framesPerBuffer;
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}
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for( i=0; i<framesToCalc; i++ )
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{
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data->left_phase += (LEFT_FREQ / SAMPLE_RATE);
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if( data->left_phase > 1.0) data->left_phase -= 1.0;
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sample = DOUBLE_TO_SAMPLE( AMPLITUDE * sin( (data->left_phase * M_PI * 2. ))); /**/
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*out++ = sample;
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/* *out++ = sample; /**/
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/* *out++ = 0; /**/
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data->right_phase += (RIGHT_FREQ / SAMPLE_RATE);
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if( data->right_phase > 1.0) data->right_phase -= 1.0;
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*out++ = DOUBLE_TO_SAMPLE( AMPLITUDE * sin( (data->right_phase * M_PI * 2. ))); /**/
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/* *out++ = 0; /* */
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}
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/* zero remainder of final buffer */
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for( ; i<(int)framesPerBuffer; i++ )
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{
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*out++ = SAMPLE_ZERO; /* left */
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*out++ = SAMPLE_ZERO; /* right */
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}
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return finished;
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}
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/*******************************************************************/
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int main(void);
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int main(void)
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{
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PortAudioStream *stream;
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PaError err;
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paTestData data;
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int totalSamps;
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printf("PortAudio Test: output " FORMAT_NAME "\n");
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data.left_phase = data.right_phase = 0.0;
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data.framesToGo = totalSamps = NUM_SECONDS * SAMPLE_RATE; /* Play for a few seconds. */
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err = Pa_Initialize();
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if( err != paNoError ) goto error;
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err = Pa_OpenStream(
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&stream,
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paNoDevice,/* default input device */
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0, /* no input */
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TEST_FORMAT,
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NULL,
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Pa_GetDefaultOutputDeviceID(), /* default output device */
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2, /* stereo output */
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TEST_FORMAT,
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NULL,
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SAMPLE_RATE,
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FRAMES_PER_BUFFER,
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0, /* number of buffers, if zero then use default minimum */
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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("Waiting %d seconds for sound to finish.\n", NUM_SECONDS );
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while( Pa_StreamActive( stream ) ) Pa_Sleep(10);
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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("PortAudio Test Finished: " FORMAT_NAME "\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 occured 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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