1 /*
2 * $Id: test_rw.c,v 1.3 2006/06/10 21:30:55 dmazzoni Exp $
3 * test_rw.c
4 * Read input from one stream and write it to another.
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 * For more information see: http://www.audiomulch.com/portaudio/
11 * Copyright (c) 1999-2000 Ross Bencina and Phil Burk
12 *
13 * Permission is hereby granted, free of charge, to any person obtaining
14 * a copy of this software and associated documentation files
15 * (the "Software"), to deal in the Software without restriction,
16 * including without limitation the rights to use, copy, modify, merge,
17 * publish, distribute, sublicense, and/or sell copies of the Software,
18 * and to permit persons to whom the Software is furnished to do so,
19 * subject to the following conditions:
20 *
21 * The above copyright notice and this permission notice shall be
22 * included in all copies or substantial portions of the Software.
23 *
24 * Any person wishing to distribute modifications to the Software is
25 * requested to send the modifications to the original developer so that
26 * they can be incorporated into the canonical version.
27 *
28 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
29 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
30 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
31 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
32 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
33 * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
34 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
35 *
36 */
37
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include "pablio.h"
41
42 /*
43 ** Note that many of the older ISA sound cards on PCs do NOT support
44 ** full duplex audio (simultaneous record and playback).
45 ** And some only support full duplex at lower sample rates.
46 */
47 #define SAMPLE_RATE (44100)
48 #define NUM_SECONDS (5)
49 #define SAMPLES_PER_FRAME (2)
50 #define FRAMES_PER_BLOCK (64)
51
52 /* Select whether we will use floats or shorts. */
53 #if 1
54 #define SAMPLE_TYPE paFloat32
55 typedef float SAMPLE;
56 #else
57 #define SAMPLE_TYPE paInt16
58 typedef short SAMPLE;
59 #endif
60
61 /*******************************************************************/
62 int main(void);
main(void)63 int main(void)
64 {
65 int i;
66 SAMPLE samples[SAMPLES_PER_FRAME * FRAMES_PER_BLOCK];
67 PaError err;
68 PABLIO_Stream *aStream;
69
70 printf("Full duplex sound test using PortAudio and RingBuffers\n");
71 fflush(stdout);
72
73 /* Open simplified blocking I/O layer on top of PortAudio. */
74 err = OpenAudioStream( &aStream, SAMPLE_RATE, SAMPLE_TYPE,
75 (PABLIO_READ_WRITE | PABLIO_STEREO) );
76 if( err != paNoError ) goto error;
77
78 /* Process samples in the foreground. */
79 for( i=0; i<(NUM_SECONDS * SAMPLE_RATE); i += FRAMES_PER_BLOCK )
80 {
81 /* Read one block of data into sample array from audio input. */
82 ReadAudioStream( aStream, samples, FRAMES_PER_BLOCK );
83 /* Write that same block of data to output. */
84 WriteAudioStream( aStream, samples, FRAMES_PER_BLOCK );
85 }
86
87 CloseAudioStream( aStream );
88
89 printf("Full duplex sound test complete.\n" );
90 fflush(stdout);
91 return 0;
92
93 error:
94 Pa_Terminate();
95 fprintf( stderr, "An error occured while using the portaudio stream\n" );
96 fprintf( stderr, "Error number: %d\n", err );
97 fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
98 return -1;
99 }
100