mirror of
https://github.com/cookiengineer/audacity
synced 2025-10-31 14:13:50 +01:00
130 lines
4.5 KiB
C
130 lines
4.5 KiB
C
/*
|
|
* $Id: test_rw_echo.c 1083 2006-08-23 07:30:49Z rossb $
|
|
* test_rw_echo.c
|
|
* Echo delayed input to output.
|
|
*
|
|
* Author: Phil Burk, http://www.softsynth.com/portaudio/
|
|
*
|
|
* This program uses PABLIO, the Portable Audio Blocking I/O Library.
|
|
* PABLIO is built on top of PortAudio, the Portable Audio Library.
|
|
*
|
|
* Note that if you need low latency, you should not use PABLIO.
|
|
* Use the PA_OpenStream callback technique which is lower level
|
|
* than PABLIO.
|
|
*
|
|
* 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 <stdlib.h>
|
|
#include <math.h>
|
|
#include "pablio.h"
|
|
#include <string.h>
|
|
|
|
/*
|
|
** Note that many of the older ISA sound cards on PCs do NOT support
|
|
** full duplex audio (simultaneous record and playback).
|
|
** And some only support full duplex at lower sample rates.
|
|
*/
|
|
#define SAMPLE_RATE (22050)
|
|
#define NUM_SECONDS (20)
|
|
#define SAMPLES_PER_FRAME (2)
|
|
|
|
/* Select whether we will use floats or shorts. */
|
|
#if 1
|
|
#define SAMPLE_TYPE paFloat32
|
|
typedef float SAMPLE;
|
|
#else
|
|
#define SAMPLE_TYPE paInt16
|
|
typedef short SAMPLE;
|
|
#endif
|
|
|
|
#define NUM_ECHO_FRAMES (2*SAMPLE_RATE)
|
|
SAMPLE samples[NUM_ECHO_FRAMES][SAMPLES_PER_FRAME] = {0.0};
|
|
|
|
/*******************************************************************/
|
|
int main(void);
|
|
int main(void)
|
|
{
|
|
int i;
|
|
PaError err;
|
|
PABLIO_Stream *aInStream;
|
|
PABLIO_Stream *aOutStream;
|
|
int index;
|
|
|
|
printf("Full duplex sound test using PABLIO\n");
|
|
fflush(stdout);
|
|
|
|
/* Open simplified blocking I/O layer on top of PortAudio. */
|
|
/* Open input first so it can start to fill buffers. */
|
|
err = OpenAudioStream( &aInStream, SAMPLE_RATE, SAMPLE_TYPE,
|
|
(PABLIO_READ | PABLIO_STEREO) );
|
|
if( err != paNoError ) goto error;
|
|
/* printf("opened input\n"); fflush(stdout); /**/
|
|
|
|
err = OpenAudioStream( &aOutStream, SAMPLE_RATE, SAMPLE_TYPE,
|
|
(PABLIO_WRITE | PABLIO_STEREO) );
|
|
if( err != paNoError ) goto error;
|
|
/* printf("opened output\n"); fflush(stdout); /**/
|
|
|
|
/* Process samples in the foreground. */
|
|
index = 0;
|
|
for( i=0; i<(NUM_SECONDS * SAMPLE_RATE); i++ )
|
|
{
|
|
/* Write old frame of data to output. */
|
|
/* samples[index][1] = (i&256) * (1.0f/256.0f); /* sawtooth */
|
|
WriteAudioStream( aOutStream, &samples[index][0], 1 );
|
|
|
|
/* Read one frame of data into sample array for later output. */
|
|
ReadAudioStream( aInStream, &samples[index][0], 1 );
|
|
index += 1;
|
|
if( index >= NUM_ECHO_FRAMES ) index = 0;
|
|
|
|
if( (i & 0xFFFF) == 0 ) printf("i = %d\n", i ); fflush(stdout); /**/
|
|
}
|
|
|
|
CloseAudioStream( aOutStream );
|
|
CloseAudioStream( aInStream );
|
|
|
|
printf("R/W echo sound test complete.\n" );
|
|
fflush(stdout);
|
|
return 0;
|
|
|
|
error:
|
|
fprintf( stderr, "An error occured while using PortAudio\n" );
|
|
fprintf( stderr, "Error number: %d\n", err );
|
|
fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
|
|
return -1;
|
|
}
|