123 lines
4.3 KiB
C
123 lines
4.3 KiB
C
/*
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* $Id: test_rw_echo.c,v 1.3 2006/06/10 21:30:55 dmazzoni Exp $
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* test_rw_echo.c
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* Echo delayed input to output.
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*
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* Author: Phil Burk, http://www.softsynth.com/portaudio/
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*
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* This program uses PABLIO, the Portable Audio Blocking I/O Library.
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* PABLIO is built on top of PortAudio, the Portable Audio Library.
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*
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* Note that if you need low latency, you should not use PABLIO.
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* Use the PA_OpenStream callback technique which is lower level
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* than PABLIO.
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*
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* For more information see: http://www.audiomulch.com/portaudio/
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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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* 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.
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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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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include "pablio.h"
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#include <string.h>
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/*
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** Note that many of the older ISA sound cards on PCs do NOT support
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** full duplex audio (simultaneous record and playback).
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** And some only support full duplex at lower sample rates.
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*/
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#define SAMPLE_RATE (22050)
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#define NUM_SECONDS (20)
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#define SAMPLES_PER_FRAME (2)
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/* Select whether we will use floats or shorts. */
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#if 1
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#define SAMPLE_TYPE paFloat32
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typedef float SAMPLE;
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#else
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#define SAMPLE_TYPE paInt16
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typedef short SAMPLE;
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#endif
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#define NUM_ECHO_FRAMES (2*SAMPLE_RATE)
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SAMPLE samples[NUM_ECHO_FRAMES][SAMPLES_PER_FRAME] = {0.0};
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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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int i;
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PaError err;
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PABLIO_Stream *aInStream;
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PABLIO_Stream *aOutStream;
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int index;
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printf("Full duplex sound test using PABLIO\n");
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fflush(stdout);
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/* Open simplified blocking I/O layer on top of PortAudio. */
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/* Open input first so it can start to fill buffers. */
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err = OpenAudioStream( &aInStream, SAMPLE_RATE, SAMPLE_TYPE,
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(PABLIO_READ | PABLIO_STEREO) );
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if( err != paNoError ) goto error;
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/* printf("opened input\n"); fflush(stdout); /**/
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err = OpenAudioStream( &aOutStream, SAMPLE_RATE, SAMPLE_TYPE,
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(PABLIO_WRITE | PABLIO_STEREO) );
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if( err != paNoError ) goto error;
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/* printf("opened output\n"); fflush(stdout); /**/
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/* Process samples in the foreground. */
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index = 0;
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for( i=0; i<(NUM_SECONDS * SAMPLE_RATE); i++ )
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{
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/* Write old frame of data to output. */
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/* samples[index][1] = (i&256) * (1.0f/256.0f); /* sawtooth */
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WriteAudioStream( aOutStream, &samples[index][0], 1 );
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/* Read one frame of data into sample array for later output. */
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ReadAudioStream( aInStream, &samples[index][0], 1 );
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index += 1;
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if( index >= NUM_ECHO_FRAMES ) index = 0;
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if( (i & 0xFFFF) == 0 ) printf("i = %d\n", i ); fflush(stdout); /**/
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}
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CloseAudioStream( aOutStream );
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CloseAudioStream( aInStream );
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printf("R/W echo sound test complete.\n" );
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fflush(stdout);
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return 0;
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error:
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fprintf( stderr, "An error occured while using PortAudio\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 -1;
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}
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