1 /*
2 * $Id: test_rw_echo.c,v 1.3 2006/06/10 21:30:55 dmazzoni Exp $
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.audiomulch.com/portaudio/
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 * Any person wishing to distribute modifications to the Software is
30 * requested to send the modifications to the original developer so that
31 * they can be incorporated into the canonical version.
32 *
33 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
34 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
35 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
36 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
37 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
38 * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
39 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
40 *
41 */
42
43 #include <stdio.h>
44 #include <stdlib.h>
45 #include <math.h>
46 #include "pablio.h"
47 #include <string.h>
48
49 /*
50 ** Note that many of the older ISA sound cards on PCs do NOT support
51 ** full duplex audio (simultaneous record and playback).
52 ** And some only support full duplex at lower sample rates.
53 */
54 #define SAMPLE_RATE (22050)
55 #define NUM_SECONDS (20)
56 #define SAMPLES_PER_FRAME (2)
57
58 /* Select whether we will use floats or shorts. */
59 #if 1
60 #define SAMPLE_TYPE paFloat32
61 typedef float SAMPLE;
62 #else
63 #define SAMPLE_TYPE paInt16
64 typedef short SAMPLE;
65 #endif
66
67 #define NUM_ECHO_FRAMES (2*SAMPLE_RATE)
68 SAMPLE samples[NUM_ECHO_FRAMES][SAMPLES_PER_FRAME] = {0.0};
69
70 /*******************************************************************/
71 int main(void);
main(void)72 int main(void)
73 {
74 int i;
75 PaError err;
76 PABLIO_Stream *aInStream;
77 PABLIO_Stream *aOutStream;
78 int index;
79
80 printf("Full duplex sound test using PABLIO\n");
81 fflush(stdout);
82
83 /* Open simplified blocking I/O layer on top of PortAudio. */
84 /* Open input first so it can start to fill buffers. */
85 err = OpenAudioStream( &aInStream, SAMPLE_RATE, SAMPLE_TYPE,
86 (PABLIO_READ | PABLIO_STEREO) );
87 if( err != paNoError ) goto error;
88 /* printf("opened input\n"); fflush(stdout); /**/
89
90 err = OpenAudioStream( &aOutStream, SAMPLE_RATE, SAMPLE_TYPE,
91 (PABLIO_WRITE | PABLIO_STEREO) );
92 if( err != paNoError ) goto error;
93 /* printf("opened output\n"); fflush(stdout); /**/
94
95 /* Process samples in the foreground. */
96 index = 0;
97 for( i=0; i<(NUM_SECONDS * SAMPLE_RATE); i++ )
98 {
99 /* Write old frame of data to output. */
100 /* samples[index][1] = (i&256) * (1.0f/256.0f); /* sawtooth */
101 WriteAudioStream( aOutStream, &samples[index][0], 1 );
102
103 /* Read one frame of data into sample array for later output. */
104 ReadAudioStream( aInStream, &samples[index][0], 1 );
105 index += 1;
106 if( index >= NUM_ECHO_FRAMES ) index = 0;
107
108 if( (i & 0xFFFF) == 0 ) printf("i = %d\n", i ); fflush(stdout); /**/
109 }
110
111 CloseAudioStream( aOutStream );
112 CloseAudioStream( aInStream );
113
114 printf("R/W echo sound test complete.\n" );
115 fflush(stdout);
116 return 0;
117
118 error:
119 fprintf( stderr, "An error occured while using PortAudio\n" );
120 fprintf( stderr, "Error number: %d\n", err );
121 fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
122 return -1;
123 }
124