114 lines
3.6 KiB
C++
Executable File
114 lines
3.6 KiB
C++
Executable File
/**********
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This library is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by the
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Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)
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This library is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this library; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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**********/
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// "liveMedia"
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// Copyright (c) 1996-2016 Live Networks, Inc. All rights reserved.
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// Theora Video RTP Sources
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// Implementation
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#include "TheoraVideoRTPSource.hh"
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////////// TheoraBufferedPacket and TheoraBufferedPacketFactory //////////
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class TheoraBufferedPacket: public BufferedPacket {
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public:
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TheoraBufferedPacket();
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virtual ~TheoraBufferedPacket();
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private: // redefined virtual functions
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virtual unsigned nextEnclosedFrameSize(unsigned char*& framePtr,
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unsigned dataSize);
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};
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class TheoraBufferedPacketFactory: public BufferedPacketFactory {
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private: // redefined virtual functions
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virtual BufferedPacket* createNewPacket(MultiFramedRTPSource* ourSource);
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};
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///////// TheoraVideoRTPSource implementation ////////
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TheoraVideoRTPSource*
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TheoraVideoRTPSource::createNew(UsageEnvironment& env, Groupsock* RTPgs,
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unsigned char rtpPayloadFormat) {
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return new TheoraVideoRTPSource(env, RTPgs, rtpPayloadFormat);
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}
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TheoraVideoRTPSource
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::TheoraVideoRTPSource(UsageEnvironment& env, Groupsock* RTPgs,
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unsigned char rtpPayloadFormat)
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: MultiFramedRTPSource(env, RTPgs, rtpPayloadFormat, 90000,
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new TheoraBufferedPacketFactory),
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fCurPacketIdent(0) {
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}
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TheoraVideoRTPSource::~TheoraVideoRTPSource() {
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}
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Boolean TheoraVideoRTPSource
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::processSpecialHeader(BufferedPacket* packet,
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unsigned& resultSpecialHeaderSize) {
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unsigned char* headerStart = packet->data();
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unsigned packetSize = packet->dataSize();
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resultSpecialHeaderSize = 4;
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if (packetSize < resultSpecialHeaderSize) return False; // packet was too small
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// The first 3 bytes of the header are the "Ident" field:
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fCurPacketIdent = (headerStart[0]<<16) | (headerStart[1]<<8) | headerStart[2];
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// The 4th byte is F|TDT|numPkts.
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// Reject any packet with TDT == 3:
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if ((headerStart[3]&0x30) == 0x30) return False;
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u_int8_t F = headerStart[3]>>6;
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fCurrentPacketBeginsFrame = F <= 1; // "Not Fragmented" or "Start Fragment"
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fCurrentPacketCompletesFrame = F == 0 || F == 3; // "Not Fragmented" or "End Fragment"
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return True;
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}
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char const* TheoraVideoRTPSource::MIMEtype() const {
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return "video/THEORA";
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}
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////////// TheoraBufferedPacket and TheoraBufferedPacketFactory implementation //////////
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TheoraBufferedPacket::TheoraBufferedPacket() {
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}
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TheoraBufferedPacket::~TheoraBufferedPacket() {
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}
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unsigned TheoraBufferedPacket
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::nextEnclosedFrameSize(unsigned char*& framePtr, unsigned dataSize) {
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if (dataSize < 2) {
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// There's not enough space for a 2-byte header. TARFU! Just return the data that's left:
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return dataSize;
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}
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unsigned frameSize = (framePtr[0]<<8) | framePtr[1];
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framePtr += 2;
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if (frameSize > dataSize - 2) return dataSize - 2; // inconsistent frame size => just return all the data that's left
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return frameSize;
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}
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BufferedPacket* TheoraBufferedPacketFactory
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::createNewPacket(MultiFramedRTPSource* /*ourSource*/) {
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return new TheoraBufferedPacket();
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}
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