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
146
147
148
149
|
/*
* Copyright (C) 2014 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <assert.h>
#include "gsmamr_dec.h"
#include <audio_utils/sndfile.h>
// Constants for AMR-NB
enum {
kInputBufferSize = 64,
kSamplesPerFrame = 160,
kBitsPerSample = 16,
kOutputBufferSize = kSamplesPerFrame * kBitsPerSample/8,
kSampleRate = 8000,
kChannels = 1,
kFileHeaderSize = 6
};
const uint32_t kFrameSizes[] = {12, 13, 15, 17, 19, 20, 26, 31};
int main(int argc, char *argv[]) {
if(argc != 3) {
fprintf(stderr, "Usage %s <input file> <output file>\n", argv[0]);
return 1;
}
// Open the input file
FILE* fpInput = fopen(argv[1], "rb");
if (!fpInput) {
fprintf(stderr, "Could not open %s\n", argv[1]);
return 1;
}
// Validate the input AMR file
char header[kFileHeaderSize];
int bytesRead = fread(header, 1, kFileHeaderSize, fpInput);
if (bytesRead != kFileHeaderSize || memcmp(header, "#!AMR\n", kFileHeaderSize)) {
fprintf(stderr, "Invalid AMR-NB file\n");
return 1;
}
// Open the output file
SF_INFO sfInfo;
memset(&sfInfo, 0, sizeof(SF_INFO));
sfInfo.channels = kChannels;
sfInfo.format = SF_FORMAT_WAV | SF_FORMAT_PCM_16;
sfInfo.samplerate = kSampleRate;
SNDFILE *handle = sf_open(argv[2], SFM_WRITE, &sfInfo);
if(!handle){
fprintf(stderr, "Could not create %s\n", argv[2]);
return 1;
}
// Create AMR-NB decoder instance
void* amrHandle;
int err = GSMInitDecode(&amrHandle, (Word8*)"AMRNBDecoder");
if(err != 0){
fprintf(stderr, "Error creating AMR-NB decoder instance\n");
return 1;
}
//Allocate input buffer
void *inputBuf = malloc(kInputBufferSize);
assert(inputBuf != NULL);
//Allocate output buffer
void *outputBuf = malloc(kOutputBufferSize);
assert(outputBuf != NULL);
// Decode loop
uint32_t retVal = 0;
while (1) {
// Read mode
uint8_t mode;
bytesRead = fread(&mode, 1, 1, fpInput);
if (bytesRead != 1) break;
// Find frame type
Frame_Type_3GPP frameType = (Frame_Type_3GPP)((mode >> 3) & 0x0f);
if (frameType >= AMR_SID){
fprintf(stderr, "Frame type %d not supported\n",frameType);
retVal = 1;
break;
}
// Find frame type
int32_t frameSize = kFrameSizes[frameType];
bytesRead = fread(inputBuf, 1, frameSize, fpInput);
if (bytesRead != frameSize) break;
//Decode frame
int32_t decodeStatus;
decodeStatus = AMRDecode(amrHandle, frameType, (uint8_t*)inputBuf,
(int16_t*)outputBuf, MIME_IETF);
if(decodeStatus == -1) {
fprintf(stderr, "Decoder encountered error\n");
retVal = 1;
break;
}
//Write output to wav
sf_writef_short(handle, (int16_t*)outputBuf, kSamplesPerFrame);
}
// Close input and output file
fclose(fpInput);
sf_close(handle);
//Free allocated memory
free(inputBuf);
free(outputBuf);
// Close decoder instance
GSMDecodeFrameExit(&amrHandle);
return retVal;
}
|