/*----------------------------------------------------------------------
| AP4_FileByteStream::AP4_FileByteStream
+---------------------------------------------------------------------*/
AP4_FileByteStream::AP4_FileByteStream(const char* name,
AP4_FileByteStream::Mode mode)
{
AP4_ByteStream* stream = NULL;
AP4_Result result = AP4_KodiFileByteStream::Create(this, name, mode, stream);
if (AP4_FAILED(result)) throw AP4_Exception(result);
m_Delegate = stream;
}
/*----------------------------------------------------------------------
| AP4_RtpPacket::AP4_RtpPacket
+---------------------------------------------------------------------*/
AP4_RtpPacket::AP4_RtpPacket(AP4_ByteStream& stream) :
m_ReferenceCount(1),
m_TimeStampOffset(0)
{
AP4_UI08 octet;
// relative time
AP4_UI32 relative_time;
stream.ReadUI32(relative_time);
m_RelativeTime = relative_time;
// pbit and xbit
stream.ReadUI08(octet);
m_PBit = (octet & 0x20) != 0;
m_XBit = (octet & 0x10) != 0;
// mbit and payload type
stream.ReadUI08(octet);
m_MBit = (octet & 0x80) != 0;
m_PayloadType = octet & 0x7F;
// sequence seed
stream.ReadUI16(m_SequenceSeed);
// extra, bframe and repeat flags
stream.ReadUI08(octet);
stream.ReadUI08(octet); // repeat on purpose
bool extra_flag = (octet & 0x04) != 0;
// bframe and repeat flags
m_BFrameFlag = (octet & 0x02) != 0;
m_RepeatFlag = (octet & 0x01) != 0;
// constructor count
AP4_UI16 constructor_count;
stream.ReadUI16(constructor_count);
// parse the packet extra data
if (extra_flag) {
// read the length
AP4_UI32 extra_length;
stream.ReadUI32(extra_length);
// check it
if (extra_length < 4)
throw AP4_Exception(AP4_ERROR_INVALID_RTP_PACKET_EXTRA_DATA);
// now read the entries
extra_length -= 4;
while (extra_length > 0) {
AP4_UI32 entry_length;
AP4_UI32 entry_tag;
stream.ReadUI32(entry_length);
stream.ReadUI32(entry_tag);
// check the entry
if (entry_length < 8) {
throw AP4_Exception(AP4_ERROR_INVALID_RTP_PACKET_EXTRA_DATA);
}
// parse the single entry that's currently defined in the spec
if (entry_tag == AP4_ATOM_TYPE('r','t','p','o') && entry_length == 12) {
AP4_UI32 time_stamp_offset;
stream.ReadUI32(time_stamp_offset);
m_TimeStampOffset = time_stamp_offset;
} else {
// ignore it
AP4_Offset cur_pos;
stream.Tell(cur_pos);
stream.Seek(cur_pos + entry_length - 8); // 8 = length + tag
}
extra_length -= entry_length;
}
}
// constructors
for (AP4_UI16 i=0; i<constructor_count; i++) {
AP4_RtpConstructor* constructor = NULL;
AP4_RtpConstructorFactory::CreateConstructorFromStream(stream, constructor);
m_Constructors.Add(constructor);
}
}
