int DecodeVoicePCM(int codec, void* pBufIn, int nLenIn, void* pBufOut, int nLenOut)
{
struct g72x_state state;
int dec_bits;
XBUFFER xbin;
XBUFFER xbout;
unsigned int nSavePackData = 0;
int nSavePackBit = 0;
unsigned char nUnpackEncData;
switch (codec)
{
case G723_24 : dec_bits = 3; break;
case G721_32 : dec_bits = 4; break;
case G723_40 : dec_bits = 5; break;
default : return 0;
}
g72x_init_state(&state);
SetXBuffer(xbin , (unsigned char*) pBufIn , nLenIn , nLenIn, 0);
SetXBuffer(xbout, (unsigned char*) pBufOut, nLenOut, 0 , 0);
while (UnpackInput(nSavePackData, nSavePackBit, xbin, nUnpackEncData, dec_bits) >= 0)
{
int nUnpackSourceData;
switch (codec)
{
case G723_24 : nUnpackSourceData = g723_24_decoder(nUnpackEncData, AUDIO_ENCODING_LINEAR, &state); break;
case G721_32 : nUnpackSourceData = g721_decoder (nUnpackEncData, AUDIO_ENCODING_LINEAR, &state); break;
case G723_40 : nUnpackSourceData = g723_40_decoder(nUnpackEncData, AUDIO_ENCODING_LINEAR, &state); break;
}
AddXBufferShort(xbout, nUnpackSourceData);
}
return xbout.nLen;
}
WORD FAR PASCAL G23A05toG16 (_segment _sBufSeg, BYTBASPTR pcSrcBuf,
WORD FAR *lpusBytCnt, GENBASPTR psDstBuf,
WORD usRsv001, LPITCB lpITC)
{
G2XBLK gbG2X = lpITC->gbG2X; /* Init G721 interface block */
WORD usBit = lpITC->usBitOff;
WORD usByt = lpITC->usBytOff;
WORD usi;
/********************************************************************/
/********************************************************************/
// modify to accept bit offset from previous pass
usi = *lpusBytCnt;
while (usi) {
if (usBit < BITCNT) {
usByt |= (*_sBufSeg:>pcSrcBuf++ << usBit);
usBit += BYTSIZ;
usi--;
}
*_sBufSeg:>psDstBuf++ = g723_40_decoder (usByt & 0xf, 0, &gbG2X);
usByt >>= BITCNT;
usBit -= BITCNT;
}