Chris@4: /*
Chris@4:  * $Id: test_rw_echo.c 1083 2006-08-23 07:30:49Z rossb $
Chris@4:  * test_rw_echo.c
Chris@4:  * Echo delayed input to output.
Chris@4:  *
Chris@4:  * Author: Phil Burk, http://www.softsynth.com/portaudio/
Chris@4:  *
Chris@4:  * This program uses PABLIO, the Portable Audio Blocking I/O Library.
Chris@4:  * PABLIO is built on top of PortAudio, the Portable Audio Library.
Chris@4:  *
Chris@4:  * Note that if you need low latency, you should not use PABLIO.
Chris@4:  * Use the PA_OpenStream callback technique which is lower level
Chris@4:  * than PABLIO.
Chris@4:  *
Chris@4:  * For more information see: http://www.portaudio.com
Chris@4:  * Copyright (c) 1999-2000 Ross Bencina and Phil Burk
Chris@4:  *
Chris@4:  * Permission is hereby granted, free of charge, to any person obtaining
Chris@4:  * a copy of this software and associated documentation files
Chris@4:  * (the "Software"), to deal in the Software without restriction,
Chris@4:  * including without limitation the rights to use, copy, modify, merge,
Chris@4:  * publish, distribute, sublicense, and/or sell copies of the Software,
Chris@4:  * and to permit persons to whom the Software is furnished to do so,
Chris@4:  * subject to the following conditions:
Chris@4:  *
Chris@4:  * The above copyright notice and this permission notice shall be
Chris@4:  * included in all copies or substantial portions of the Software.
Chris@4:  *
Chris@4:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
Chris@4:  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
Chris@4:  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
Chris@4:  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
Chris@4:  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
Chris@4:  * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
Chris@4:  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Chris@4:  */
Chris@4: 
Chris@4: /*
Chris@4:  * The text above constitutes the entire PortAudio license; however, 
Chris@4:  * the PortAudio community also makes the following non-binding requests:
Chris@4:  *
Chris@4:  * Any person wishing to distribute modifications to the Software is
Chris@4:  * requested to send the modifications to the original developer so that
Chris@4:  * they can be incorporated into the canonical version. It is also 
Chris@4:  * requested that these non-binding requests be included along with the 
Chris@4:  * license above.
Chris@4:  */
Chris@4: 
Chris@4: #include <stdio.h>
Chris@4: #include <stdlib.h>
Chris@4: #include <math.h>
Chris@4: #include "pablio.h"
Chris@4: #include <string.h>
Chris@4: 
Chris@4: /*
Chris@4: ** Note that many of the older ISA sound cards on PCs do NOT support
Chris@4: ** full duplex audio (simultaneous record and playback).
Chris@4: ** And some only support full duplex at lower sample rates.
Chris@4: */
Chris@4: #define SAMPLE_RATE         (22050)
Chris@4: #define NUM_SECONDS            (20)
Chris@4: #define SAMPLES_PER_FRAME       (2)
Chris@4: 
Chris@4: /* Select whether we will use floats or shorts. */
Chris@4: #if 1
Chris@4: #define SAMPLE_TYPE  paFloat32
Chris@4: typedef float SAMPLE;
Chris@4: #else
Chris@4: #define SAMPLE_TYPE  paInt16
Chris@4: typedef short SAMPLE;
Chris@4: #endif
Chris@4: 
Chris@4: #define NUM_ECHO_FRAMES   (2*SAMPLE_RATE)
Chris@4: SAMPLE   samples[NUM_ECHO_FRAMES][SAMPLES_PER_FRAME] = {0.0};
Chris@4: 
Chris@4: /*******************************************************************/
Chris@4: int main(void);
Chris@4: int main(void)
Chris@4: {
Chris@4:     int      i;
Chris@4:     PaError  err;
Chris@4:     PABLIO_Stream     *aInStream;
Chris@4:     PABLIO_Stream     *aOutStream;
Chris@4:     int      index;
Chris@4: 
Chris@4:     printf("Full duplex sound test using PABLIO\n");
Chris@4:     fflush(stdout);
Chris@4: 
Chris@4:     /* Open simplified blocking I/O layer on top of PortAudio. */
Chris@4:     /* Open input first so it can start to fill buffers. */
Chris@4:     err = OpenAudioStream( &aInStream, SAMPLE_RATE, SAMPLE_TYPE,
Chris@4:                            (PABLIO_READ | PABLIO_STEREO) );
Chris@4:     if( err != paNoError ) goto error;
Chris@4:     /* printf("opened input\n");  fflush(stdout); /**/
Chris@4: 
Chris@4:     err = OpenAudioStream( &aOutStream, SAMPLE_RATE, SAMPLE_TYPE,
Chris@4:                            (PABLIO_WRITE | PABLIO_STEREO) );
Chris@4:     if( err != paNoError ) goto error;
Chris@4:     /* printf("opened output\n");  fflush(stdout); /**/
Chris@4: 
Chris@4:     /* Process samples in the foreground. */
Chris@4:     index = 0;
Chris@4:     for( i=0; i<(NUM_SECONDS * SAMPLE_RATE); i++ )
Chris@4:     {
Chris@4:         /* Write old frame of data to output. */
Chris@4:         /* samples[index][1] = (i&256) * (1.0f/256.0f); /* sawtooth */
Chris@4:         WriteAudioStream( aOutStream, &samples[index][0], 1 );
Chris@4: 
Chris@4:         /* Read one frame of data into sample array for later output. */
Chris@4:         ReadAudioStream( aInStream, &samples[index][0], 1 );
Chris@4:         index += 1;
Chris@4:         if( index >= NUM_ECHO_FRAMES ) index = 0;
Chris@4: 
Chris@4:         if( (i & 0xFFFF) == 0 ) printf("i = %d\n", i ); fflush(stdout); /**/
Chris@4:     }
Chris@4: 
Chris@4:     CloseAudioStream( aOutStream );
Chris@4:     CloseAudioStream( aInStream );
Chris@4: 
Chris@4:     printf("R/W echo sound test complete.\n" );
Chris@4:     fflush(stdout);
Chris@4:     return 0;
Chris@4: 
Chris@4: error:
Chris@4:     fprintf( stderr, "An error occured while using PortAudio\n" );
Chris@4:     fprintf( stderr, "Error number: %d\n", err );
Chris@4:     fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
Chris@4:     return -1;
Chris@4: }