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comparison src/portaudio/pablio/test_rw_echo.c @ 4:e13257ea84a4

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Add bzip2, zlib, liblo, portaudio sources
author Chris Cannam
date Wed, 20 Mar 2013 13:59:52 +0000
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3:6c505a35919a 4:e13257ea84a4
1 /*
2 * $Id: test_rw_echo.c 1083 2006-08-23 07:30:49Z rossb $
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 }