cannam@162: /*
cannam@162:  * $Id$
cannam@162:  * test_rw_echo.c
cannam@162:  * Echo delayed input to output.
cannam@162:  *
cannam@162:  * Author: Phil Burk, http://www.softsynth.com/portaudio/
cannam@162:  *
cannam@162:  * This program uses PABLIO, the Portable Audio Blocking I/O Library.
cannam@162:  * PABLIO is built on top of PortAudio, the Portable Audio Library.
cannam@162:  *
cannam@162:  * Note that if you need low latency, you should not use PABLIO.
cannam@162:  * Use the PA_OpenStream callback technique which is lower level
cannam@162:  * than PABLIO.
cannam@162:  *
cannam@162:  * For more information see: http://www.portaudio.com
cannam@162:  * Copyright (c) 1999-2000 Ross Bencina and Phil Burk
cannam@162:  *
cannam@162:  * Permission is hereby granted, free of charge, to any person obtaining
cannam@162:  * a copy of this software and associated documentation files
cannam@162:  * (the "Software"), to deal in the Software without restriction,
cannam@162:  * including without limitation the rights to use, copy, modify, merge,
cannam@162:  * publish, distribute, sublicense, and/or sell copies of the Software,
cannam@162:  * and to permit persons to whom the Software is furnished to do so,
cannam@162:  * subject to the following conditions:
cannam@162:  *
cannam@162:  * The above copyright notice and this permission notice shall be
cannam@162:  * included in all copies or substantial portions of the Software.
cannam@162:  *
cannam@162:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
cannam@162:  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
cannam@162:  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
cannam@162:  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
cannam@162:  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
cannam@162:  * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
cannam@162:  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
cannam@162:  */
cannam@162: 
cannam@162: /*
cannam@162:  * The text above constitutes the entire PortAudio license; however, 
cannam@162:  * the PortAudio community also makes the following non-binding requests:
cannam@162:  *
cannam@162:  * Any person wishing to distribute modifications to the Software is
cannam@162:  * requested to send the modifications to the original developer so that
cannam@162:  * they can be incorporated into the canonical version. It is also 
cannam@162:  * requested that these non-binding requests be included along with the 
cannam@162:  * license above.
cannam@162:  */
cannam@162: 
cannam@162: #include <stdio.h>
cannam@162: #include <stdlib.h>
cannam@162: #include <math.h>
cannam@162: #include "pablio.h"
cannam@162: #include <string.h>
cannam@162: 
cannam@162: /*
cannam@162: ** Note that many of the older ISA sound cards on PCs do NOT support
cannam@162: ** full duplex audio (simultaneous record and playback).
cannam@162: ** And some only support full duplex at lower sample rates.
cannam@162: */
cannam@162: #define SAMPLE_RATE         (22050)
cannam@162: #define NUM_SECONDS            (20)
cannam@162: #define SAMPLES_PER_FRAME       (2)
cannam@162: 
cannam@162: /* Select whether we will use floats or shorts. */
cannam@162: #if 1
cannam@162: #define SAMPLE_TYPE  paFloat32
cannam@162: typedef float SAMPLE;
cannam@162: #else
cannam@162: #define SAMPLE_TYPE  paInt16
cannam@162: typedef short SAMPLE;
cannam@162: #endif
cannam@162: 
cannam@162: #define NUM_ECHO_FRAMES   (2*SAMPLE_RATE)
cannam@162: SAMPLE   samples[NUM_ECHO_FRAMES][SAMPLES_PER_FRAME] = {0.0};
cannam@162: 
cannam@162: /*******************************************************************/
cannam@162: int main(void);
cannam@162: int main(void)
cannam@162: {
cannam@162:     int      i;
cannam@162:     PaError  err;
cannam@162:     PABLIO_Stream     *aInStream;
cannam@162:     PABLIO_Stream     *aOutStream;
cannam@162:     int      index;
cannam@162: 
cannam@162:     printf("Full duplex sound test using PABLIO\n");
cannam@162:     fflush(stdout);
cannam@162: 
cannam@162:     /* Open simplified blocking I/O layer on top of PortAudio. */
cannam@162:     /* Open input first so it can start to fill buffers. */
cannam@162:     err = OpenAudioStream( &aInStream, SAMPLE_RATE, SAMPLE_TYPE,
cannam@162:                            (PABLIO_READ | PABLIO_STEREO) );
cannam@162:     if( err != paNoError ) goto error;
cannam@162:     /* printf("opened input\n");  fflush(stdout); /**/
cannam@162: 
cannam@162:     err = OpenAudioStream( &aOutStream, SAMPLE_RATE, SAMPLE_TYPE,
cannam@162:                            (PABLIO_WRITE | PABLIO_STEREO) );
cannam@162:     if( err != paNoError ) goto error;
cannam@162:     /* printf("opened output\n");  fflush(stdout); /**/
cannam@162: 
cannam@162:     /* Process samples in the foreground. */
cannam@162:     index = 0;
cannam@162:     for( i=0; i<(NUM_SECONDS * SAMPLE_RATE); i++ )
cannam@162:     {
cannam@162:         /* Write old frame of data to output. */
cannam@162:         /* samples[index][1] = (i&256) * (1.0f/256.0f); /* sawtooth */
cannam@162:         WriteAudioStream( aOutStream, &samples[index][0], 1 );
cannam@162: 
cannam@162:         /* Read one frame of data into sample array for later output. */
cannam@162:         ReadAudioStream( aInStream, &samples[index][0], 1 );
cannam@162:         index += 1;
cannam@162:         if( index >= NUM_ECHO_FRAMES ) index = 0;
cannam@162: 
cannam@162:         if( (i & 0xFFFF) == 0 ) printf("i = %d\n", i ); fflush(stdout); /**/
cannam@162:     }
cannam@162: 
cannam@162:     CloseAudioStream( aOutStream );
cannam@162:     CloseAudioStream( aInStream );
cannam@162: 
cannam@162:     printf("R/W echo sound test complete.\n" );
cannam@162:     fflush(stdout);
cannam@162:     return 0;
cannam@162: 
cannam@162: error:
cannam@162:     fprintf( stderr, "An error occured while using PortAudio\n" );
cannam@162:     fprintf( stderr, "Error number: %d\n", err );
cannam@162:     fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
cannam@162:     return -1;
cannam@162: }