CODEC_API int PLG_DECODE_V1(sipxPcma)(void* handle, const void* pCodedData,
unsigned cbCodedPacketSize, void* pAudioBuffer,
unsigned cbBufferSize, unsigned *pcbCodedSize,
const struct RtpHeader* pRtpHeader)
{
int samples;
if (handle != DECODER_HANDLE)
return RPLG_BAD_HANDLE;
// Assert that available buffer size is enough for the packet.
if (cbCodedPacketSize > cbBufferSize)
{
return RPLG_INVALID_ARGUMENT;
}
if (cbBufferSize == 0)
return RPLG_INVALID_ARGUMENT;
samples = min(cbCodedPacketSize, cbBufferSize);
#ifdef USE_BUGGY_G711 // [
G711A_Decoder(samples, (uint8_t*)pCodedData, (MpAudioSample *)pAudioBuffer);
#else // USE_BUGGY_G711 ][
{
int16_t *pSamples = (int16_t*)pAudioBuffer;
uint8_t *pEncoded = (uint8_t*)pCodedData;
int i;
for (i=0; i<samples; i++)
{
pSamples[i] = alaw_to_linear(pEncoded[i]);
}
}
#endif // USE_BUGGY_G711 ]
*pcbCodedSize = samples;
return RPLG_SUCCESS;
}
int MpJitterBuffer::ReceivePacket(JB_uchar* RTPpacket, JB_size RTPlength, JB_ulong TS)
{
int numSamples = 0;
unsigned char* pRtpData = NULL;
struct rtpHeader* pHdr = (struct rtpHeader*) RTPpacket;
int cc;
int payloadType;
int overhead;
payloadType = (pHdr->mpt) & 0x7f;
cc = (pHdr->vpxcc) & 0x0f;
overhead = sizeof(struct rtpHeader) + (cc*sizeof(int));
switch (payloadType) {
case 0: // G.711 u-Law
case 8: // G.711 a-Law
numSamples = RTPlength - overhead;;
pRtpData = RTPpacket + overhead;
break;
default:
break;
}
if (0 == numSamples)
{
return 0;
}
if (numSamples != 160)
{
if (debugCount++ < 10)
{
printf("RTPlength=%d, cc=%d, payloadType=%d\n", RTPlength,
cc, payloadType);
}
}
if (JbQWait > 0)
{
JbQWait--;
}
if (JbQueueSize == JbQCount)
{
// discard some data...
JbQOut = JbQIn + numSamples;
JbQCount -= numSamples;
}
switch (payloadType)
{
case 0: // G.711 u-Law
G711U_Decoder(numSamples, pRtpData, JbQ+JbQIn);
break;
case 8: // G.711 a-Law
G711A_Decoder(numSamples, pRtpData, JbQ+JbQIn);
break;
default:
break;
}
JbQCount += numSamples;
JbQIn += numSamples;
if (JbQIn >= JbQueueSize)
{
JbQIn -= JbQueueSize;
}
return 0;
}
