MpCodecSubInfo* MpCodecFactory::searchByMIME(const UtlString& mime,
int sampleRate,
int numChannels) const
{
// Create a lower case copy of MIME-subtype string.
UtlString mime_copy(mime);
mime_copy.toLower();
// Create iterator to list all codecs with given MIME subtype.
UtlHashBagIterator iter(mCodecsInfo, &mime_copy);
MpCodecSubInfo* pInfo;
while ((pInfo = (MpCodecSubInfo*)iter()))
{
if ((int)(pInfo->getCodecInfo()->sampleRate) == sampleRate &&
(int)(pInfo->getCodecInfo()->numChannels) == numChannels)
{
return pInfo;
}
}
return NULL;
/*
// Create a lower case copy of MIME-subtype string.
UtlString mime_copy(mime);
mime_copy.toLower();
// Perform search
return (MpCodecSubInfo*)mCodecsInfo.find(&mime_copy);
*/
}
MpCodecSubInfo* MpCodecFactory::searchByMIME(const UtlString& mime,
int sampleRate,
int numChannels) const
{
// Create a lower case copy of MIME-subtype string.
UtlString mime_copy(mime);
mime_copy.toLower();
int _sampleRate = sampleRate;
if(mime == "G722" && sampleRate == 8000)
{
// From RFC 3551 s4.5.2:
//
// Even though the actual sampling rate for G.722 audio is 16,000 Hz,
// the RTP clock rate for the G722 payload format is 8,000 Hz because
// that value was erroneously assigned in RFC 1890 and must remain
// unchanged for backward compatibility. The octet rate or sample-pair
// rate is 8,000 Hz.
//
// Therefore, when the codec is G722 and we see 8000 in RTP, we need
// to look for the standard 16000 codec implementation.
//
// This is often described as a hack, but it is a hack specified by the RFC
// and we have to live with it. Some implementations may not implement
// the hack correctly and may not interoperate.
_sampleRate = 16000;
}
// Create iterator to list all codecs with given MIME subtype.
UtlHashBagIterator iter(mCodecsInfo, &mime_copy);
MpCodecSubInfo* pInfo;
while ((pInfo = (MpCodecSubInfo*)iter()))
{
if (pInfo->getCodecInfo()->sampleRate == _sampleRate &&
pInfo->getCodecInfo()->numChannels == numChannels)
{
return pInfo;
}
}
return NULL;
/*
// Create a lower case copy of MIME-subtype string.
UtlString mime_copy(mime);
mime_copy.toLower();
// Perform search
return (MpCodecSubInfo*)mCodecsInfo.find(&mime_copy);
*/
}
