/**
* unmarshal a single SEI message from bitstream bs
*/
void parseSEImessage(TComInputBitstream& bs, SEImessages& seis)
{
unsigned payloadType = 0;
for (unsigned char byte = 0xff; 0xff == byte; )
{
payloadType += byte = bs.read(8);
}
unsigned payloadSize = 0;
for (unsigned char byte = 0xff; 0xff == byte; )
{
payloadSize += byte = bs.read(8);
}
switch (payloadType)
{
case SEI::USER_DATA_UNREGISTERED:
seis.user_data_unregistered = new SEIuserDataUnregistered;
parseSEIuserDataUnregistered(bs, *seis.user_data_unregistered, payloadSize);
break;
case SEI::PICTURE_DIGEST:
seis.picture_digest = new SEIpictureDigest;
parseSEIpictureDigest(bs, *seis.picture_digest, payloadSize);
break;
default:
assert(!"Unhandled SEI message");
}
}
/**
* parse bitstream bs and unpack a picture_digest SEI message
* of payloadSize bytes into sei.
*/
static void parseSEIpictureDigest(TComInputBitstream& bs, SEIpictureDigest& sei, unsigned payloadSize)
{
assert(payloadSize >= 17);
sei.method = static_cast<SEIpictureDigest::Method>(bs.read(8));
assert(SEIpictureDigest::MD5 == sei.method);
for (unsigned i = 0; i < 16; i++)
{
sei.digest[i] = bs.read(8);
}
}
/**
* parse bitstream bs and unpack a user_data_unregistered SEI message
* of payloasSize bytes into sei.
*/
static void parseSEIuserDataUnregistered(TComInputBitstream& bs, SEIuserDataUnregistered &sei, unsigned payloadSize)
{
assert(payloadSize >= 16);
for (unsigned i = 0; i < 16; i++)
{
sei.uuid_iso_iec_11578[i] = bs.read(8);
}
sei.userDataLength = payloadSize - 16;
if (!sei.userDataLength)
{
sei.userData = 0;
return;
}
sei.userData = new unsigned char[sei.userDataLength];
for (unsigned i = 0; i < sei.userDataLength; i++)
{
sei.userData[i] = bs.read(8);
}
}