| /********** |
| This library is free software; you can redistribute it and/or modify it under |
| the terms of the GNU Lesser General Public License as published by the |
| Free Software Foundation; either version 3 of the License, or (at your |
| option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.) |
| |
| This library is distributed in the hope that it will be useful, but WITHOUT |
| ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
| FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for |
| more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with this library; if not, write to the Free Software Foundation, Inc., |
| 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| **********/ |
| // "liveMedia" |
| // Copyright (c) 1996-2020 Live Networks, Inc. All rights reserved. |
| // DV Video RTP Sources |
| // Implementation |
| |
| #include "DVVideoRTPSource.hh" |
| |
| DVVideoRTPSource* |
| DVVideoRTPSource::createNew(UsageEnvironment& env, |
| Groupsock* RTPgs, |
| unsigned char rtpPayloadFormat, |
| unsigned rtpTimestampFrequency) { |
| return new DVVideoRTPSource(env, RTPgs, rtpPayloadFormat, rtpTimestampFrequency); |
| } |
| |
| DVVideoRTPSource::DVVideoRTPSource(UsageEnvironment& env, |
| Groupsock* rtpGS, |
| unsigned char rtpPayloadFormat, |
| unsigned rtpTimestampFrequency) |
| : MultiFramedRTPSource(env, rtpGS, |
| rtpPayloadFormat, rtpTimestampFrequency) { |
| } |
| |
| DVVideoRTPSource::~DVVideoRTPSource() { |
| } |
| |
| #define DV_DIF_BLOCK_SIZE 80 |
| #define DV_SECTION_HEADER 0x1F |
| |
| Boolean DVVideoRTPSource |
| ::processSpecialHeader(BufferedPacket* packet, |
| unsigned& resultSpecialHeaderSize) { |
| unsigned const packetSize = packet->dataSize(); |
| if (packetSize < DV_DIF_BLOCK_SIZE) return False; // TARFU! |
| |
| u_int8_t const* data = packet->data(); |
| fCurrentPacketBeginsFrame = data[0] == DV_SECTION_HEADER && (data[1]&0xf8) == 0 && data[2] == 0; // thanks to Ben Hutchings |
| |
| // The RTP "M" (marker) bit indicates the last fragment of a frame: |
| fCurrentPacketCompletesFrame = packet->rtpMarkerBit(); |
| |
| // There is no special header |
| resultSpecialHeaderSize = 0; |
| return True; |
| } |
| |
| char const* DVVideoRTPSource::MIMEtype() const { |
| return "video/DV"; |
| } |
| |