int main(int argc, char *argv[]) {
FILE* in;
char header[6];
int n;
void *wav, *amr;
if (argc < 3) {
fprintf(stderr, "%s in.amr out.wav\n", argv[0]);
return 1;
}
in = fopen(argv[1], "rb");
if (!in) {
perror(argv[1]);
return 1;
}
n = fread(header, 1, 6, in);
if (n != 6 || memcmp(header, "#!AMR\n", 6)) {
fprintf(stderr, "Bad header\n");
return 1;
}
wav = wav_write_open(argv[2], 8000, 16, 1);
if (!wav) {
fprintf(stderr, "Unable to open %s\n", argv[2]);
return 1;
}
amr = Decoder_Interface_init();
while (1) {
uint8_t buffer[500], littleendian[320], *ptr;
int size, i;
int16_t outbuffer[160];
/* Read the mode byte */
n = fread(buffer, 1, 1, in);
if (n <= 0)
break;
/* Find the packet size */
size = sizes[(buffer[0] >> 3) & 0x0f];
n = fread(buffer + 1, 1, size, in);
if (n != size)
break;
/* Decode the packet */
Decoder_Interface_Decode(amr, buffer, outbuffer, 0);
/* Convert to little endian and write to wav */
ptr = littleendian;
for (i = 0; i < 160; i++) {
*ptr++ = (outbuffer[i] >> 0) & 0xff;
*ptr++ = (outbuffer[i] >> 8) & 0xff;
}
wav_write_data(wav, littleendian, 320);
}
fclose(in);
Decoder_Interface_exit(amr);
wav_write_close(wav);
return 0;
}
int decode_amr(const char* infile, const char* outfile) {
FILE* in = fopen(infile, "rb");
if (!in) {
return 1;
}
char header[6];
ssize_t n = fread(header, 1, 6, in);
if (n != 6 || memcmp(header, "#!AMR\n", 6)) {
fprintf(stderr, "Bad header\n");
return 1;
}
void* wav = wav_write_open(outfile, 8000, 16, 1);
void* amr = Decoder_Interface_init();
while (1) {
uint8_t buffer[500];
/* Read the mode byte */
n = fread(buffer, 1, 1, in);
if (n <= 0)
break;
/* Find the packet size */
int size = sizes[(buffer[0] >> 3) & 0x0f];
if (size <= 0)
continue;
n = fread(buffer + 1, 1, size, in);
if (n != size)
break;
/* Decode the packet */
int16_t outbuffer[160];
Decoder_Interface_Decode(amr, buffer, outbuffer, 0);
/* Convert to little endian and write to wav */
uint8_t littleendian[320];
uint8_t* ptr = littleendian;
for (int i = 0; i < 160; i++) {
*ptr++ = (outbuffer[i] >> 0) & 0xff;
*ptr++ = (outbuffer[i] >> 8) & 0xff;
}
wav_write_data(wav, littleendian, 320);
}
fclose(in);
Decoder_Interface_exit(amr);
wav_write_close(wav);
return 0;
}
int main(int argc, char *argv[]) {
const char *infile, *outfile;
AVFormatContext *in = NULL;
AVStream *st = NULL;
void *wav = NULL;
int output_size, ret, i;
uint8_t *output_buf;
int16_t *decode_buf;
HANDLE_AACDECODER handle;
AAC_DECODER_ERROR err;
int frame_size = 0;
if (argc < 3) {
fprintf(stderr, "%s in.m4a out.wav\n", argv[0]);
return 1;
}
infile = argv[1];
outfile = argv[2];
av_register_all();
avformat_network_init();
ret = avformat_open_input(&in, infile, NULL, NULL);
if (ret < 0) {
char buf[100];
av_strerror(ret, buf, sizeof(buf));
fprintf(stderr, "%s: %s\n", infile, buf);
return 1;
}
for (i = 0; i < in->nb_streams && !st; i++) {
if (in->streams[i]->codec->codec_id == AV_CODEC_ID_AAC)
st = in->streams[i];
}
if (!st) {
fprintf(stderr, "No AAC stream found\n");
return 1;
}
if (!st->codec->extradata_size) {
fprintf(stderr, "No AAC ASC found\n");
return 1;
}
handle = aacDecoder_Open(TT_MP4_RAW, 1);
err = aacDecoder_ConfigRaw(handle, &st->codec->extradata, &st->codec->extradata_size);
if (err != AAC_DEC_OK) {
fprintf(stderr, "Unable to decode the ASC\n");
return 1;
}
output_size = 8*2*1024;
output_buf = (uint8_t*) malloc(output_size);
decode_buf = (int16_t*) malloc(output_size);
while (1) {
int i;
UINT valid;
AVPacket pkt = { 0 };
int ret = av_read_frame(in, &pkt);
if (ret < 0) {
if (ret == AVERROR(EAGAIN))
continue;
break;
}
if (pkt.stream_index != st->index) {
av_free_packet(&pkt);
continue;
}
valid = pkt.size;
err = aacDecoder_Fill(handle, &pkt.data, &pkt.size, &valid);
if (err != AAC_DEC_OK) {
fprintf(stderr, "Fill failed: %x\n", err);
break;
}
err = aacDecoder_DecodeFrame(handle, decode_buf, output_size, 0);
av_free_packet(&pkt);
if (err == AAC_DEC_NOT_ENOUGH_BITS)
continue;
if (err != AAC_DEC_OK) {
fprintf(stderr, "Decode failed: %x\n", err);
continue;
}
if (!wav) {
CStreamInfo *info = aacDecoder_GetStreamInfo(handle);
if (!info || info->sampleRate <= 0) {
fprintf(stderr, "No stream info\n");
break;
}
frame_size = info->frameSize * info->numChannels;
// Note, this probably doesn't return channels > 2 in the right order for wav
wav = wav_write_open(outfile, info->sampleRate, 16, info->numChannels);
if (!wav) {
perror(outfile);
break;
}
}
for (i = 0; i < frame_size; i++) {
uint8_t* out = &output_buf[2*i];
out[0] = decode_buf[i] & 0xff;
out[1] = decode_buf[i] >> 8;
}
wav_write_data(wav, output_buf, 2*frame_size);
}
free(output_buf);
free(decode_buf);
avformat_close_input(&in);
if (wav)
wav_write_close(wav);
aacDecoder_Close(handle);
return 0;
}