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/*
* 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 <malloc.h>
#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;
}
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