| /********** |
| 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. |
| // A 'ServerMediaSubsession' object that creates new, unicast, "RTPSink"s |
| // on demand, from a DV video file. |
| // Implementation |
| |
| #include "DVVideoFileServerMediaSubsession.hh" |
| #include "DVVideoRTPSink.hh" |
| #include "ByteStreamFileSource.hh" |
| #include "DVVideoStreamFramer.hh" |
| |
| DVVideoFileServerMediaSubsession* |
| DVVideoFileServerMediaSubsession::createNew(UsageEnvironment& env, char const* fileName, Boolean reuseFirstSource) { |
| return new DVVideoFileServerMediaSubsession(env, fileName, reuseFirstSource); |
| } |
| |
| DVVideoFileServerMediaSubsession |
| ::DVVideoFileServerMediaSubsession(UsageEnvironment& env, char const* fileName, Boolean reuseFirstSource) |
| : FileServerMediaSubsession(env, fileName, reuseFirstSource), |
| fFileDuration(0.0) { |
| } |
| |
| DVVideoFileServerMediaSubsession::~DVVideoFileServerMediaSubsession() { |
| } |
| |
| FramedSource* DVVideoFileServerMediaSubsession |
| ::createNewStreamSource(unsigned /*clientSessionId*/, unsigned& estBitrate) { |
| // Create the video source: |
| ByteStreamFileSource* fileSource = ByteStreamFileSource::createNew(envir(), fFileName); |
| if (fileSource == NULL) return NULL; |
| fFileSize = fileSource->fileSize(); |
| |
| // Create a framer for the Video Elementary Stream: |
| DVVideoStreamFramer* framer = DVVideoStreamFramer::createNew(envir(), fileSource, True/*the file source is seekable*/); |
| |
| // Use the framer to figure out the file's duration: |
| unsigned frameSize; |
| double frameDuration; |
| if (framer->getFrameParameters(frameSize, frameDuration)) { |
| fFileDuration = (float)(((int64_t)fFileSize*frameDuration)/(frameSize*1000000.0)); |
| estBitrate = (unsigned)((8000.0*frameSize)/frameDuration); // in kbps |
| } else { |
| estBitrate = 50000; // kbps, estimate |
| } |
| |
| return framer; |
| } |
| |
| RTPSink* DVVideoFileServerMediaSubsession::createNewRTPSink(Groupsock* rtpGroupsock, |
| unsigned char rtpPayloadTypeIfDynamic, |
| FramedSource* /*inputSource*/) { |
| return DVVideoRTPSink::createNew(envir(), rtpGroupsock, rtpPayloadTypeIfDynamic); |
| } |
| |
| char const* DVVideoFileServerMediaSubsession::getAuxSDPLine(RTPSink* rtpSink, FramedSource* inputSource) { |
| return ((DVVideoRTPSink*)rtpSink)->auxSDPLineFromFramer((DVVideoStreamFramer*)inputSource); |
| } |
| |
| float DVVideoFileServerMediaSubsession::duration() const { |
| return fFileDuration; |
| } |
| |
| void DVVideoFileServerMediaSubsession |
| ::seekStreamSource(FramedSource* inputSource, double& seekNPT, double streamDuration, u_int64_t& numBytes) { |
| // First, get the file source from "inputSource" (a framer): |
| DVVideoStreamFramer* framer = (DVVideoStreamFramer*)inputSource; |
| ByteStreamFileSource* fileSource = (ByteStreamFileSource*)(framer->inputSource()); |
| |
| // Then figure out where to seek to within the file: |
| if (fFileDuration > 0.0) { |
| u_int64_t seekByteNumber = (u_int64_t)(((int64_t)fFileSize*seekNPT)/fFileDuration); |
| numBytes = (u_int64_t)(((int64_t)fFileSize*streamDuration)/fFileDuration); |
| fileSource->seekToByteAbsolute(seekByteNumber, numBytes); |
| } |
| } |
| |
| void DVVideoFileServerMediaSubsession |
| ::setStreamSourceDuration(FramedSource* inputSource, double streamDuration, u_int64_t& numBytes) { |
| // First, get the file source from "inputSource" (a framer): |
| DVVideoStreamFramer* framer = (DVVideoStreamFramer*)inputSource; |
| ByteStreamFileSource* fileSource = (ByteStreamFileSource*)(framer->inputSource()); |
| |
| // Then figure out how many bytes to limit the streaming to: |
| if (fFileDuration > 0.0) { |
| numBytes = (u_int64_t)(((int64_t)fFileSize*streamDuration)/fFileDuration); |
| fileSource->seekToByteRelative(0, numBytes); |
| } |
| } |