gearmulator

patest_sine_formats.c (7142B)

---

 /** @file patest_sine_formats.c
 	@ingroup test_src
 	@brief Play a sine wave for several seconds. Test various data formats.
 	@author Phil Burk
 */
 /*
  * $Id$
  *
  * 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"
 
 #define NUM_SECONDS        (10)
 #define SAMPLE_RATE        (44100)
 #define FRAMES_PER_BUFFER  (512)
 #define LEFT_FREQ          (SAMPLE_RATE/256.0)  /* So we hit 1.0 */
 #define RIGHT_FREQ         (500.0)
 #define AMPLITUDE          (1.0)
 
 /* Select ONE format for testing. */
 #define TEST_UINT8    (0)
 #define TEST_INT8     (0)
 #define TEST_INT16    (1)
 #define TEST_FLOAT32  (0)
 
 #if TEST_UINT8
 #define TEST_FORMAT         paUInt8
 typedef unsigned char       SAMPLE_t;
 #define SAMPLE_ZERO         (0x80)
 #define DOUBLE_TO_SAMPLE(x) (SAMPLE_ZERO + (SAMPLE_t)(127.0 * (x)))
 #define FORMAT_NAME         "Unsigned 8 Bit"
 
 #elif TEST_INT8
 #define TEST_FORMAT         paInt8
 typedef char                SAMPLE_t;
 #define SAMPLE_ZERO         (0)
 #define DOUBLE_TO_SAMPLE(x) (SAMPLE_ZERO + (SAMPLE_t)(127.0 * (x)))
 #define FORMAT_NAME         "Signed 8 Bit"
 
 #elif TEST_INT16
 #define TEST_FORMAT         paInt16
 typedef short               SAMPLE_t;
 #define SAMPLE_ZERO         (0)
 #define DOUBLE_TO_SAMPLE(x) (SAMPLE_ZERO + (SAMPLE_t)(32767 * (x)))
 #define FORMAT_NAME         "Signed 16 Bit"
 
 #elif TEST_FLOAT32
 #define TEST_FORMAT         paFloat32
 typedef float               SAMPLE_t;
 #define SAMPLE_ZERO         (0.0)
 #define DOUBLE_TO_SAMPLE(x) ((SAMPLE_t)(x))
 #define FORMAT_NAME         "Float 32 Bit"
 #endif
 
 #ifndef M_PI
 #define M_PI  (3.14159265)
 #endif
 
 
 typedef struct
 {
     double left_phase;
     double right_phase;
     unsigned int framesToGo;
 }
 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( const void *inputBuffer,
                            void *outputBuffer,
                            unsigned long framesPerBuffer,
                            const PaStreamCallbackTimeInfo* timeInfo,
                            PaStreamCallbackFlags statusFlags,
                            void *userData )
 {
     paTestData *data = (paTestData*)userData;
     SAMPLE_t *out = (SAMPLE_t *)outputBuffer;
     int i;
     int framesToCalc;
     int finished = 0;
     (void) inputBuffer; /* Prevent unused variable warnings. */
 
     if( data->framesToGo < framesPerBuffer )
     {
         framesToCalc = data->framesToGo;
         data->framesToGo = 0;
         finished = 1;
     }
     else
     {
         framesToCalc = framesPerBuffer;
         data->framesToGo -= framesPerBuffer;
     }
 
     for( i=0; i<framesToCalc; i++ )
     {
         data->left_phase += (LEFT_FREQ / SAMPLE_RATE);
         if( data->left_phase > 1.0) data->left_phase -= 1.0;
         *out++ = DOUBLE_TO_SAMPLE( AMPLITUDE * sin( (data->left_phase * M_PI * 2. )));
 
         data->right_phase += (RIGHT_FREQ / SAMPLE_RATE);
         if( data->right_phase > 1.0) data->right_phase -= 1.0;
         *out++ = DOUBLE_TO_SAMPLE( AMPLITUDE * sin( (data->right_phase * M_PI * 2. )));
     }
     /* zero remainder of final buffer */
     for( ; i<(int)framesPerBuffer; i++ )
     {
         *out++ = SAMPLE_ZERO; /* left */
         *out++ = SAMPLE_ZERO; /* right */
     }
     return finished;
 }
 /*******************************************************************/
 int main(void);
 int main(void)
 {
     PaStream *stream;
     PaStreamParameters outputParameters;
     PaError err;
     paTestData data;
     int totalSamps;
 
     printf("PortAudio Test: output " FORMAT_NAME "\n");
 
     data.left_phase = data.right_phase = 0.0;
     data.framesToGo = totalSamps =  NUM_SECONDS * SAMPLE_RATE; /* Play for a few seconds. */
     err = Pa_Initialize();
     if( err != paNoError ) goto error;
 
 
     outputParameters.device           = Pa_GetDefaultOutputDevice(); /* Default output device. */
     outputParameters.channelCount     = 2;                           /* Stereo output */
     outputParameters.sampleFormat     = TEST_FORMAT;                 /* Selected above. */
     outputParameters.suggestedLatency = Pa_GetDeviceInfo(outputParameters.device)->defaultLowOutputLatency;
     outputParameters.hostApiSpecificStreamInfo = NULL;
     err = Pa_OpenStream( &stream,
                          NULL,                  /* No input. */
                          &outputParameters,     /* As above. */
                          SAMPLE_RATE,
                          FRAMES_PER_BUFFER,
                          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("Waiting %d seconds for sound to finish.\n", NUM_SECONDS );
 
     while( ( err = Pa_IsStreamActive( stream ) ) == 1 ) Pa_Sleep(100);
     if( err < 0 ) goto error;
 
     err = Pa_CloseStream( stream );
     if( err != paNoError ) goto error;
     Pa_Terminate();
 
     printf("PortAudio Test Finished: " FORMAT_NAME "\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;
 }