1 /*---------------------------------------------------------------------------*
2 * AudioHardwareRecord.c *
3 * *
4 * Copyright 2007, 2008 Nuance Communciations, Inc. *
5 * *
6 * Licensed under the Apache License, Version 2.0 (the 'License'); *
7 * you may not use this file except in compliance with the License. *
8 * *
9 * You may obtain a copy of the License at *
10 * http://www.apache.org/licenses/LICENSE-2.0 *
11 * *
12 * Unless required by applicable law or agreed to in writing, software *
13 * distributed under the License is distributed on an 'AS IS' BASIS, *
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. *
15 * See the License for the specific language governing permissions and *
16 * limitations under the License. *
17 * *
18 *---------------------------------------------------------------------------*/
19
20 #include <stdlib.h>
21 #include <stdio.h>
22 #include <limits.h>
23 #include <string.h>
24 #include <unistd.h>
25 #include <sys/select.h>
26 #include "audioinwrapper.h"
27
28 #define SAMPLING_RATE 8000
29
30 #define N_FRAMES_PER_BUFFER 512 /* low-level driver counts in terms of frames, not samples */
31 #define N_TUPLES_PER_FRAME 1 /* tuple: a set of samples (set of 1 if mono, set of 2 if stereo */
32
33 #define N_CHANNELS_PER_TUPLE 1 /* 1: mono; 2: stereo */
34
35 #define N_TUPLES_PER_BUFFER (N_FRAMES_PER_BUFFER * N_TUPLES_PER_FRAME)
36 #define N_SAMPLES_PER_BUFFER (N_TUPLES_PER_BUFFER * N_CHANNELS_PER_TUPLE)
37
38 #define N_RECORDINGS 1000
39 #define N_SECONDS_TO_RECORD 5
40 #define N_SAMPLES_TO_RECORD (SAMPLING_RATE * N_SECONDS_TO_RECORD * N_CHANNELS_PER_TUPLE)
41
42 typedef short typeSample;
43
44 /* store incoming samples here, then write to file at the end */
45 typeSample recordedSamples[N_SAMPLES_TO_RECORD];
46
47 //#define AUDIO_SET_FORMAT_ONCE_ONLY
48
main(int argc,char * argv[])49 int main(int argc, char* argv[])
50 {
51 int rc;
52 unsigned int iFile;
53
54 const unsigned short delay_ms = 2000; //1800 //340;
55
56 printf("For debugging, this is configured to sleep for %u milliseconds before AudioSetInputFormat(%u)\n\n", delay_ms, SAMPLING_RATE);
57
58 #if defined(AUDIO_SET_FORMAT_ONCE_ONLY)
59 rc = AudioSetInputFormat(SAMPLING_RATE, N_CHANNELS_PER_TUPLE);
60 if (rc != 0)
61 {
62 printf("ERROR: AudioSetInputFormat() returns %d\n", rc);
63 exit(1);
64 }
65 #endif
66
67 for (iFile = 1; iFile <= N_RECORDINGS; iFile++)
68 {
69 unsigned int i;
70
71 #if !defined(AUDIO_SET_FORMAT_ONCE_ONLY)
72 {
73 // see how much of a delay is needed to get rid of error when calling
74 // AudioSetInputFormat() immediately after AudioClose()
75 struct timeval sleep_time_struct;
76 sleep_time_struct.tv_sec = 0;
77 sleep_time_struct.tv_usec = delay_ms*1000; // microseconds
78 select(0, NULL, NULL, NULL, &sleep_time_struct);
79 }
80
81 rc = AudioSetInputFormat(SAMPLING_RATE, N_CHANNELS_PER_TUPLE);
82 if (rc != 0)
83 {
84 printf("ERROR: AudioSetInputFormat() returns %d\n", rc);
85 exit(1);
86 }
87 #endif
88
89 printf("Recording: %3d of %3d\n", iFile, N_RECORDINGS);
90
91 memset(recordedSamples, 0, N_SAMPLES_TO_RECORD * sizeof(typeSample));
92
93 rc = AudioOpen();
94 if (rc < 0)
95 {
96 printf("ERROR: AudioOpen() returns %d (device handle/ID)\n", rc);
97 exit(1);
98 }
99
100 i = 0;
101 while (i <= N_SAMPLES_TO_RECORD - N_SAMPLES_PER_BUFFER)
102 {
103 rc = AudioRead(&(recordedSamples[i]), N_FRAMES_PER_BUFFER);
104 if (rc > 0)
105 i += (rc * N_TUPLES_PER_FRAME * N_CHANNELS_PER_TUPLE);
106 else
107 printf("ERROR: AudioRead() returns %d\n", rc);
108 }
109
110 rc = AudioClose();
111 if (rc != 0)
112 {
113 printf("ERROR: AudioClose() returns %d\n", rc);
114 exit(1);
115 }
116
117 /* write to file */
118 #if 0
119 {
120 FILE *fpOutput;
121 char szFilename[256];
122
123 sprintf(szFilename, "output_AudioHardwareRecordLoop_%03d.pcm", iFile);
124
125 fpOutput = fopen(szFilename, "wb");
126 if (fpOutput == NULL)
127 {
128 printf("ERROR: cannot create '%s'\n", szFilename);
129 exit(1);
130 }
131 fwrite(recordedSamples, sizeof(typeSample), i, fpOutput);
132 fclose(fpOutput);
133
134 printf("Recording: saved '%s'\n", szFilename);
135 }
136 #endif
137 }
138
139 return 0;
140 }
141