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/**********
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 2.1 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.,
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
**********/
// "liveMedia"
// Copyright (c) 1996-2005 Live Networks, Inc. All rights reserved.
// MPEG4-GENERIC ("audio", "video", or "application") RTP stream sinks
// Implementation
#include "MPEG4GenericRTPSink.hh"
MPEG4GenericRTPSink
::MPEG4GenericRTPSink(UsageEnvironment& env, Groupsock* RTPgs,
u_int8_t rtpPayloadFormat,
u_int32_t rtpTimestampFrequency,
char const* sdpMediaTypeString,
char const* mpeg4Mode, char const* configString,
unsigned numChannels)
: MultiFramedRTPSink(env, RTPgs, rtpPayloadFormat,
rtpTimestampFrequency, "MPEG4-GENERIC", numChannels),
fSDPMediaTypeString(strDup(sdpMediaTypeString)),
fMPEG4Mode(strDup(mpeg4Mode)), fConfigString(strDup(configString)) {
// Check whether "mpeg4Mode" is one that we handle:
if (mpeg4Mode == NULL) {
env << "MPEG4GenericRTPSink error: NULL \"mpeg4Mode\" parameter\n";
} else if (strcmp(mpeg4Mode, "AAC-hbr") != 0) {
env << "MPEG4GenericRTPSink error: Unknown \"mpeg4Mode\" parameter: \""
<< mpeg4Mode << "\"\n";
}
// Set up the "a=fmtp:" SDP line for this stream:
char const* fmtpFmt =
"a=fmtp:%d "
"streamtype=%d;profile-level-id=1;"
"mode=%s;sizelength=13;indexlength=3;indexdeltalength=3;"
"config=%s\r\n";
unsigned fmtpFmtSize = strlen(fmtpFmt)
+ 3 /* max char len */
+ 3 /* max char len */
+ strlen(fMPEG4Mode)
+ strlen(fConfigString);
char* fmtp = new char[fmtpFmtSize];
sprintf(fmtp, fmtpFmt,
rtpPayloadType(),
strcmp(fSDPMediaTypeString, "video") == 0 ? 4 : 5,
fMPEG4Mode,
fConfigString);
fFmtpSDPLine = strDup(fmtp);
delete[] fmtp;
}
MPEG4GenericRTPSink::~MPEG4GenericRTPSink() {
delete[] fFmtpSDPLine;
delete[] (char*)fConfigString;
delete[] (char*)fMPEG4Mode;
delete[] (char*)fSDPMediaTypeString;
}
MPEG4GenericRTPSink*
MPEG4GenericRTPSink::createNew(UsageEnvironment& env, Groupsock* RTPgs,
u_int8_t rtpPayloadFormat,
u_int32_t rtpTimestampFrequency,
char const* sdpMediaTypeString,
char const* mpeg4Mode,
char const* configString, unsigned numChannels) {
return new MPEG4GenericRTPSink(env, RTPgs, rtpPayloadFormat,
rtpTimestampFrequency,
sdpMediaTypeString, mpeg4Mode,
configString, numChannels);
}
Boolean MPEG4GenericRTPSink
::frameCanAppearAfterPacketStart(unsigned char const* /*frameStart*/,
unsigned /*numBytesInFrame*/) const {
// (For now) allow at most 1 frame in a single packet:
return False;
}
void MPEG4GenericRTPSink
::doSpecialFrameHandling(unsigned fragmentationOffset,
unsigned char* frameStart,
unsigned numBytesInFrame,
struct timeval frameTimestamp,
unsigned numRemainingBytes) {
// Set the "AU Header Section". This is 4 bytes: 2 bytes for the
// initial "AU-headers-length" field, and 2 bytes for the first
// (and only) "AU Header":
unsigned fullFrameSize
= fragmentationOffset + numBytesInFrame + numRemainingBytes;
unsigned char headers[4];
headers[0] = 0; headers[1] = 16 /* bits */; // AU-headers-length
headers[2] = fullFrameSize >> 5; headers[3] = (fullFrameSize&0x1F)<<3;
setSpecialHeaderBytes(headers, sizeof headers);
if (numRemainingBytes == 0) {
// This packet contains the last (or only) fragment of the frame.
// Set the RTP 'M' ('marker') bit:
setMarkerBit();
}
// Important: Also call our base class's doSpecialFrameHandling(),
// to set the packet's timestamp:
MultiFramedRTPSink::doSpecialFrameHandling(fragmentationOffset,
frameStart, numBytesInFrame,
frameTimestamp,
numRemainingBytes);
}
unsigned MPEG4GenericRTPSink::specialHeaderSize() const {
return 2 + 2;
}
char const* MPEG4GenericRTPSink::sdpMediaType() const {
return fSDPMediaTypeString;
}
char const* MPEG4GenericRTPSink::auxSDPLine() {
return fFmtpSDPLine;
}
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