int MediaEngine::getAudioSamples(u8* buffer) {
if (!m_demux) {
return 0;
}
u8* audioStream = 0;
int audioSize = m_demux->getaudioStream(&audioStream);
if (m_audioPos >= audioSize || !isHeader(audioStream, m_audioPos))
{
return 0;
}
u8 headerCode1 = audioStream[2];
u8 headerCode2 = audioStream[3];
int frameSize = ((headerCode1 & 0x03) << 8) | (headerCode2 & 0xFF) * 8 + 0x10;
if (m_audioPos + frameSize > audioSize)
return 0;
m_audioPos += 8;
int nextHeader = getNextHeaderPosition(audioStream, m_audioPos, audioSize, frameSize);
u8* frame = audioStream + m_audioPos;
int outbytes = 0;
Atrac3plus_Decoder::Decode(m_audioContext, frame, frameSize - 8, &outbytes, buffer);
if (headerCode1 == 0x24) {
// it a mono atrac3plus, convert it to stereo
s16 *outbuf = (s16*)buffer;
s16 *inbuf = (s16*)buffer;
for (int i = 0x800 - 1; i >= 0; i--) {
s16 sample = inbuf[i];
outbuf[i * 2] = sample;
outbuf[i * 2 + 1] = sample;
}
}
if (nextHeader >= 0) {
m_audioPos = nextHeader;
} else
m_audioPos = audioSize;
m_audiopts += 4180;
return outbytes;
}
int convertStreamtoOMA(u8* audioStream, int audioSize, u8** outputStream)
{
if (!isHeader(audioStream, 0))
{
*outputStream = 0;
return 0;
}
u8 headerCode1 = audioStream[2];
u8 headerCode2 = audioStream[3];
if (headerCode1 == 0x28)
{
bool bsupported = false;
for (int i = 0; i < atrac3plusradiosize; i++) {
if (atrac3plusradio[i] == headerCode2)
{
bsupported = true;
break;
}
}
if (bsupported == false)
{
*outputStream = 0;
return 0;
}
}
else
{
*outputStream = 0;
return 0;
}
int frameSize = ((headerCode1 & 0x03) << 8) | (headerCode2 & 0xFF) * 8 + 0x10;
int numCompleteFrames = audioSize / (frameSize + 8);
int lastFrameSize = audioSize - (numCompleteFrames * (frameSize + 8));
int omaStreamSize = OMAHeaderSize + numCompleteFrames * frameSize + lastFrameSize;
// Allocate an OMA stream size large enough (better too large than too short)
if (audioSize > omaStreamSize) omaStreamSize = audioSize;
u8* oma = new u8[omaStreamSize];
int omapos = 0;
int audiopos = 0;
omapos += getOmaHeader(OMA_CODECID_ATRAC3P, 0, headerCode1, headerCode2, oma);
while (audioSize - audiopos > 8) {
// Skip 8 bytes frame header
audiopos += 8;
int nextHeader = getNextHeaderPosition(audioStream, audiopos, audioSize, frameSize);
u8* frame = audioStream + audiopos;
int framelimit = audioSize - audiopos;
if (nextHeader >= 0) {
framelimit = nextHeader - audiopos;
audiopos = nextHeader;
} else
audiopos = audioSize;
WriteBuf(oma, omapos, frame, framelimit);
}
*outputStream = oma;
return omapos;
}
