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/* ------------------------------------------------------------------
* 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 <enc_if.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);
}
int findMode(const char* str) {
struct {
int mode;
int rate;
} modes[] = {
{ 0, 6600 },
{ 1, 8850 },
{ 2, 12650 },
{ 3, 14250 },
{ 4, 15850 },
{ 5, 18250 },
{ 6, 19850 },
{ 7, 23050 },
{ 8, 23850 }
};
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[]) {
int mode = 8;
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 != 16000)
fprintf(stderr, "Warning, AMR-WB uses 16000 Hz sample rate (WAV file has %d Hz)\n", sampleRate);
inputSize = channels*2*320;
inputBuf = (uint8_t*) malloc(inputSize);
amr = E_IF_init();
out = fopen(outfile, "wb");
if (!out) {
perror(outfile);
return 1;
}
fwrite("#!AMR-WB\n", 1, 9, out);
while (1) {
int read, i, n;
short buf[320];
uint8_t outbuf[500];
read = wav_read_data(wav, inputBuf, inputSize);
read /= channels;
read /= 2;
if (read < 320)
break;
for (i = 0; i < 320; i++) {
const uint8_t* in = &inputBuf[2*channels*i];
buf[i] = in[0] | (in[1] << 8);
}
n = E_IF_encode(amr, mode, buf, outbuf, dtx);
fwrite(outbuf, 1, n, out);
}
free(inputBuf);
fclose(out);
E_IF_exit(amr);
wav_read_close(wav);
return 0;
}
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