gearmulator

Emulation of classic VA synths of the late 90s/2000s that are based on Motorola 56300 family DSPs
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test_rw_echo.c (4568B)

      1 /*
      2  * $Id$
      3  * test_rw_echo.c
      4  * Echo delayed input to output.
      5  *
      6  * Author: Phil Burk, http://www.softsynth.com/portaudio/
      7  *
      8  * This program uses PABLIO, the Portable Audio Blocking I/O Library.
      9  * PABLIO is built on top of PortAudio, the Portable Audio Library.
     10  *
     11  * Note that if you need low latency, you should not use PABLIO.
     12  * Use the PA_OpenStream callback technique which is lower level
     13  * than PABLIO.
     14  *
     15  * For more information see: http://www.portaudio.com
     16  * Copyright (c) 1999-2000 Ross Bencina and Phil Burk
     17  *
     18  * Permission is hereby granted, free of charge, to any person obtaining
     19  * a copy of this software and associated documentation files
     20  * (the "Software"), to deal in the Software without restriction,
     21  * including without limitation the rights to use, copy, modify, merge,
     22  * publish, distribute, sublicense, and/or sell copies of the Software,
     23  * and to permit persons to whom the Software is furnished to do so,
     24  * subject to the following conditions:
     25  *
     26  * The above copyright notice and this permission notice shall be
     27  * included in all copies or substantial portions of the Software.
     28  *
     29  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     30  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     31  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
     32  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
     33  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
     34  * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
     35  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     36  */
     37 
     38 /*
     39  * The text above constitutes the entire PortAudio license; however, 
     40  * the PortAudio community also makes the following non-binding requests:
     41  *
     42  * Any person wishing to distribute modifications to the Software is
     43  * requested to send the modifications to the original developer so that
     44  * they can be incorporated into the canonical version. It is also 
     45  * requested that these non-binding requests be included along with the 
     46  * license above.
     47  */
     48 
     49 #include <stdio.h>
     50 #include <stdlib.h>
     51 #include <math.h>
     52 #include "pablio.h"
     53 #include <string.h>
     54 
     55 /*
     56 ** Note that many of the older ISA sound cards on PCs do NOT support
     57 ** full duplex audio (simultaneous record and playback).
     58 ** And some only support full duplex at lower sample rates.
     59 */
     60 #define SAMPLE_RATE         (22050)
     61 #define NUM_SECONDS            (20)
     62 #define SAMPLES_PER_FRAME       (2)
     63 
     64 /* Select whether we will use floats or shorts. */
     65 #if 1
     66 #define SAMPLE_TYPE  paFloat32
     67 typedef float SAMPLE;
     68 #else
     69 #define SAMPLE_TYPE  paInt16
     70 typedef short SAMPLE;
     71 #endif
     72 
     73 #define NUM_ECHO_FRAMES   (2*SAMPLE_RATE)
     74 SAMPLE   samples[NUM_ECHO_FRAMES][SAMPLES_PER_FRAME] = {0.0};
     75 
     76 /*******************************************************************/
     77 int main(void);
     78 int main(void)
     79 {
     80     int      i;
     81     PaError  err;
     82     PABLIO_Stream     *aInStream;
     83     PABLIO_Stream     *aOutStream;
     84     int      index;
     85 
     86     printf("Full duplex sound test using PABLIO\n");
     87     fflush(stdout);
     88 
     89     /* Open simplified blocking I/O layer on top of PortAudio. */
     90     /* Open input first so it can start to fill buffers. */
     91     err = OpenAudioStream( &aInStream, SAMPLE_RATE, SAMPLE_TYPE,
     92                            (PABLIO_READ | PABLIO_STEREO) );
     93     if( err != paNoError ) goto error;
     94     /* printf("opened input\n");  fflush(stdout); /**/
     95 
     96     err = OpenAudioStream( &aOutStream, SAMPLE_RATE, SAMPLE_TYPE,
     97                            (PABLIO_WRITE | PABLIO_STEREO) );
     98     if( err != paNoError ) goto error;
     99     /* printf("opened output\n");  fflush(stdout); /**/
    100 
    101     /* Process samples in the foreground. */
    102     index = 0;
    103     for( i=0; i<(NUM_SECONDS * SAMPLE_RATE); i++ )
    104     {
    105         /* Write old frame of data to output. */
    106         /* samples[index][1] = (i&256) * (1.0f/256.0f); /* sawtooth */
    107         WriteAudioStream( aOutStream, &samples[index][0], 1 );
    108 
    109         /* Read one frame of data into sample array for later output. */
    110         ReadAudioStream( aInStream, &samples[index][0], 1 );
    111         index += 1;
    112         if( index >= NUM_ECHO_FRAMES ) index = 0;
    113 
    114         if( (i & 0xFFFF) == 0 ) printf("i = %d\n", i ); fflush(stdout); /**/
    115     }
    116 
    117     CloseAudioStream( aOutStream );
    118     CloseAudioStream( aInStream );
    119 
    120     printf("R/W echo sound test complete.\n" );
    121     fflush(stdout);
    122     return 0;
    123 
    124 error:
    125     fprintf( stderr, "An error occured while using PortAudio\n" );
    126     fprintf( stderr, "Error number: %d\n", err );
    127     fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
    128     return -1;
    129 }