/*
* Input : Filename
* Output : 1 if succesful 0 if not
*/
int openFile(const char * name)
{
readOff = readBuf;
if((fp = fopen(name, "rb"))) {
if(strstr(name, ".aac") || strstr(name, ".AAC")) {
dec_state = DEC_AAC;
if((decoder = AACInitDecoder())) {
if(fill_readBuffer(readBuf, &readOff, READ_BUF_SIZE, &dataLeft) == READ_BUF_SIZE) {
int ret = 0;
int bitOffset = 0, bitsAvail = dataLeft << 3;
if(IS_ADIF(readBuf))
ret = UnpackADIFHeader((AACDecInfo*)decoder, &readOff, &bitOffset, &bitsAvail);
else
ret = UnpackADTSHeader((AACDecInfo*)decoder, &readOff, &bitOffset, &bitsAvail);
if(!ret) {
AACGetLastFrameInfo(decoder, &inf);
readOff = readBuf;
dataLeft = READ_BUF_SIZE;
return 1;
}
}
}
} else {
dec_state = DEC_MP4;
mp4cb.user_data = fp;
if((infile = mp4ff_open_read(&mp4cb))) {
if ((track = findAudioTrack(infile)) >= 0) {
/* Decoder failed to initialize */
if((decoder = AACInitDecoder())) {
/* Decoder should be updated to decode raw blocks in the mp4
* IMPORTANT:
* mp4ff_get_channel_count will return the wrong value for mono in this state
*/
inf.sampRateCore = mp4ff_get_sample_rate(infile, track);
samples = mp4ff_num_samples(infile, track);
/*
DECODER CONFIG:
[AAAA ABBB] [BCCC CDEF]
A)object type
B)frequency index
C)channel configuration
D)bit: frame length flag
E)bit: dependsOnCoreCoder
F)bit: extensionFlag
*/
unsigned char * config_buf;
unsigned int config_bufSize;
mp4ff_get_decoder_config(infile, track, &config_buf, &config_bufSize);
inf.profile = AAC_PROFILE_LC;
inf.nChans = (config_buf[1] >> 3) & 0xF;
free(config_buf);
if(!AACSetRawBlockParams(decoder, 0, &inf))
return 1;
}
}
}
}
}
/**************************************************************************************
* Function: AACDecode
*
* Description: decode AAC frame
*
* Inputs: valid AAC decoder instance pointer (HAACDecoder)
* double pointer to buffer of AAC data
* pointer to number of valid bytes remaining in inbuf
* pointer to outbuf, big enough to hold one frame of decoded PCM samples
* (outbuf must be double-sized if SBR enabled)
*
* Outputs: PCM data in outbuf, interleaved LRLRLR... if stereo
* number of output samples = 1024 per channel (2048 if SBR enabled)
* updated inbuf pointer
* updated bytesLeft
*
* Return: 0 if successful, error code (< 0) if error
*
* Notes: inbuf pointer and bytesLeft are not updated until whole frame is
* successfully decoded, so if ERR_AAC_INDATA_UNDERFLOW is returned
* just call AACDecode again with more data in inbuf
**************************************************************************************/
int AACDecode(HAACDecoder hAACDecoder, unsigned char **inbuf, int *bytesLeft, short *outbuf)
{
int err, offset, bitOffset, bitsAvail;
int ch, baseChan, baseChanSBR, elementChans;
unsigned char *inptr;
AACDecInfo *aacDecInfo = (AACDecInfo *)hAACDecoder;
#ifdef AAC_ENABLE_SBR
int elementChansSBR;
#endif
if (!aacDecInfo)
return ERR_AAC_NULL_POINTER;
/* make local copies (see "Notes" above) */
inptr = *inbuf;
bitOffset = 0;
bitsAvail = (*bytesLeft) << 3;
/* first time through figure out what the file format is */
if (aacDecInfo->format == AAC_FF_Unknown) {
if (bitsAvail < 32)
return ERR_AAC_INDATA_UNDERFLOW;
if (IS_ADIF(inptr)) {
/* unpack ADIF header */
aacDecInfo->format = AAC_FF_ADIF;
err = UnpackADIFHeader(aacDecInfo, &inptr, &bitOffset, &bitsAvail);
if (err)
return err;
} else {
/* assume ADTS by default */
aacDecInfo->format = AAC_FF_ADTS;
}
}
/* if ADTS, search for start of next frame */
if (aacDecInfo->format == AAC_FF_ADTS) {
/* can have 1-4 raw data blocks per ADTS frame (header only present for first one) */
if (aacDecInfo->adtsBlocksLeft == 0) {
offset = AACFindSyncWord(inptr, bitsAvail >> 3);
if (offset < 0)
return ERR_AAC_INDATA_UNDERFLOW;
inptr += offset;
bitsAvail -= (offset << 3);
err = UnpackADTSHeader(aacDecInfo, &inptr, &bitOffset, &bitsAvail);
if (err)
return err;
if (aacDecInfo->nChans == -1) {
/* figure out implicit channel mapping if necessary */
err = GetADTSChannelMapping(aacDecInfo, inptr, bitOffset, bitsAvail);
if (err)
return err;
}
}
aacDecInfo->adtsBlocksLeft--;
} else if (aacDecInfo->format == AAC_FF_RAW) {
int aac_openFile(char * name) {
readOff = readBuffer;
if((sndFile = fopen(name, "rb"))) {
if((decoder = AACInitDecoder())) {
if(fill_readBuffer(readBuffer, &readOff, READ_BUF_SIZE, &dataLeft) == READ_BUF_SIZE) {
int ret = 0;
int bitOffset = 0, bitsAvail = dataLeft << 3;
if(IS_ADIF(readBuffer))
ret = UnpackADIFHeader((AACDecInfo*)decoder, &readOff, &bitOffset, &bitsAvail);
else
ret = UnpackADTSHeader((AACDecInfo*)decoder, &readOff, &bitOffset, &bitsAvail);
if(!ret) {
AACGetLastFrameInfo(decoder, &inf);
readOff = readBuffer;
dataLeft = READ_BUF_SIZE;
return 0;
}
}
}
}
return -1; /* sndFile == NULL */
}
