1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
/* ------------------------------------------------------------------
* Copyright (C) 2009 Martin Storsjo
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied.
* See the License for the specific language governing permissions
* and limitations under the License.
* -------------------------------------------------------------------
*/
#include <stdio.h>
#include <stdint.h>
#include <interf_enc.h>
#include <unistd.h>
#include <stdlib.h>
#include "wavreader.h"
void usage(const char* name) {
fprintf(stderr, "%s [-r bitrate] [-d] in.wav out.amr\n", name);
}
enum Mode findMode(const char* str) {
struct {
enum Mode mode;
int rate;
} modes[] = {
{ MR475, 4750 },
{ MR515, 5150 },
{ MR59, 5900 },
{ MR67, 6700 },
{ MR74, 7400 },
{ MR795, 7950 },
{ MR102, 10200 },
{ MR122, 12200 }
};
int rate = atoi(str);
int closest = -1;
int closestdiff = 0;
unsigned int i;
for (i = 0; i < sizeof(modes)/sizeof(modes[0]); i++) {
if (modes[i].rate == rate)
return modes[i].mode;
if (closest < 0 || closestdiff > abs(modes[i].rate - rate)) {
closest = i;
closestdiff = abs(modes[i].rate - rate);
}
}
fprintf(stderr, "Using bitrate %d\n", modes[closest].rate);
return modes[closest].mode;
}
int main(int argc, char *argv[]) {
enum Mode mode = MR122;
int ch, dtx = 0;
const char *infile, *outfile;
FILE *out;
void *wav, *amr;
int format, sampleRate, channels, bitsPerSample;
int inputSize;
uint8_t* inputBuf;
while ((ch = getopt(argc, argv, "r:d")) != -1) {
switch (ch) {
case 'r':
mode = findMode(optarg);
break;
case 'd':
dtx = 1;
break;
case '?':
default:
usage(argv[0]);
return 1;
}
}
if (argc - optind < 2) {
usage(argv[0]);
return 1;
}
infile = argv[optind];
outfile = argv[optind + 1];
wav = wav_read_open(infile);
if (!wav) {
fprintf(stderr, "Unable to open wav file %s\n", infile);
return 1;
}
if (!wav_get_header(wav, &format, &channels, &sampleRate, &bitsPerSample, NULL)) {
fprintf(stderr, "Bad wav file %s\n", infile);
return 1;
}
if (format != 1) {
fprintf(stderr, "Unsupported WAV format %d\n", format);
return 1;
}
if (bitsPerSample != 16) {
fprintf(stderr, "Unsupported WAV sample depth %d\n", bitsPerSample);
return 1;
}
if (channels != 1)
fprintf(stderr, "Warning, only compressing one audio channel\n");
if (sampleRate != 8000)
fprintf(stderr, "Warning, AMR-NB uses 8000 Hz sample rate (WAV file has %d Hz)\n", sampleRate);
inputSize = channels*2*160;
inputBuf = (uint8_t*) malloc(inputSize);
amr = Encoder_Interface_init(dtx);
out = fopen(outfile, "wb");
if (!out) {
perror(outfile);
return 1;
}
fwrite("#!AMR\n", 1, 6, out);
while (1) {
short buf[160];
uint8_t outbuf[500];
int read, i, n;
read = wav_read_data(wav, inputBuf, inputSize);
read /= channels;
read /= 2;
if (read < 160)
break;
for (i = 0; i < 160; i++) {
const uint8_t* in = &inputBuf[2*channels*i];
buf[i] = in[0] | (in[1] << 8);
}
n = Encoder_Interface_Encode(amr, mode, buf, outbuf, 0);
fwrite(outbuf, 1, n, out);
}
free(inputBuf);
fclose(out);
Encoder_Interface_exit(amr);
wav_read_close(wav);
return 0;
}
|
