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 "audioinwrapper.h"
25
26 #define SAMPLING_RATE 44100
27
28 #define N_FRAMES_PER_BUFFER 512 /* low-level driver counts in terms of frames, not samples */
29 #define N_TUPLES_PER_FRAME 1 /* tuple: a set of samples (set of 1 if mono, set of 2 if stereo */
30
31 #define N_CHANNELS_PER_TUPLE 1 /* 1: mono; 2: stereo */
32
33 #define N_TUPLES_PER_BUFFER (N_FRAMES_PER_BUFFER * N_TUPLES_PER_FRAME)
34 #define N_SAMPLES_PER_BUFFER (N_TUPLES_PER_BUFFER * N_CHANNELS_PER_TUPLE)
35
36 #define N_SECONDS_TO_RECORD 10
37 #define N_SAMPLES_TO_RECORD (SAMPLING_RATE * N_SECONDS_TO_RECORD * N_CHANNELS_PER_TUPLE)
38
39 typedef short typeSample;
40
41 /* store incoming samples here, then write to file at the end */
42 typeSample recordedSamples[N_SAMPLES_TO_RECORD];
43
44
main(int argc,char * argv[])45 int main(int argc, char* argv[])
46 {
47 int rc;
48 unsigned int i;
49
50 memset(recordedSamples, 0, N_SAMPLES_TO_RECORD * sizeof(typeSample));
51
52 rc = AudioSetInputFormat(SAMPLING_RATE, N_CHANNELS_PER_TUPLE);
53 if (rc != 0)
54 {
55 printf("ERROR: AudioSetInputFormat() returns %d\n", rc);
56 exit(1);
57 }
58
59 rc = AudioOpen();
60 if (rc < 0)
61 {
62 printf("ERROR: AudioOpen() returns %d (device handle/ID)\n", rc);
63 exit(1);
64 }
65
66 i = 0;
67 while (i <= N_SAMPLES_TO_RECORD - N_SAMPLES_PER_BUFFER)
68 {
69 rc = AudioRead(&(recordedSamples[i]), N_FRAMES_PER_BUFFER);
70 if (rc > 0)
71 i += (rc * N_TUPLES_PER_FRAME * N_CHANNELS_PER_TUPLE);
72 else
73 printf("ERROR: AudioRead() returns %d\n", rc);
74 }
75
76 rc = AudioClose();
77 if (rc != 0)
78 {
79 printf("ERROR: AudioClose() returns %d\n", rc);
80 exit(1);
81 }
82
83 /* write to file */
84 {
85 FILE *fpOutput;
86 char *szFilename = "output_AudioHardwareRecord.pcm";
87
88 fpOutput = fopen(szFilename, "wb");
89 if (fpOutput == NULL)
90 {
91 printf("ERROR: cannot create '%s'\n", szFilename);
92 exit(1);
93 }
94 fwrite(recordedSamples, sizeof(typeSample), i, fpOutput);
95 fclose(fpOutput);
96 }
97
98 return 0;
99 }
100