ref: 6b48b2586d74e7aa37d305fc60d1987428a5a618
dir: /common/mp4v2/rtphint.cpp/
/*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is MPEG4IP.
*
* The Initial Developer of the Original Code is Cisco Systems Inc.
* Portions created by Cisco Systems Inc. are
* Copyright (C) Cisco Systems Inc. 2001. All Rights Reserved.
*
* Contributor(s):
* Dave Mackie dmackie@cisco.com
*/
#include "mp4common.h"
/* rtp hint track operations */
MP4RtpHintTrack::MP4RtpHintTrack(MP4File* pFile, MP4Atom* pTrakAtom)
: MP4Track(pFile, pTrakAtom)
{
m_pRefTrack = NULL;
m_pRtpMapProperty = NULL;
m_pPayloadNumberProperty = NULL;
m_pMaxPacketSizeProperty = NULL;
m_pSnroProperty = NULL;
m_pTsroProperty = NULL;
m_pReadHint = NULL;
m_pReadHintSample = NULL;
m_readHintSampleSize = 0;
m_pWriteHint = NULL;
m_writeHintId = MP4_INVALID_SAMPLE_ID;
m_writePacketId = 0;
m_pTrpy = NULL;
m_pNump = NULL;
m_pTpyl = NULL;
m_pMaxr = NULL;
m_pDmed = NULL;
m_pDimm = NULL;
m_pPmax = NULL;
m_pDmax = NULL;
m_pMaxPdu = NULL;
m_pAvgPdu = NULL;
m_pMaxBitRate = NULL;
m_pAvgBitRate = NULL;
m_thisSec = 0;
m_bytesThisSec = 0;
m_bytesThisHint = 0;
m_bytesThisPacket = 0;
}
MP4RtpHintTrack::~MP4RtpHintTrack()
{
delete m_pReadHint;
delete m_pReadHintSample;
delete m_pWriteHint;
}
void MP4RtpHintTrack::InitRefTrack()
{
if (m_pRefTrack == NULL) {
MP4Integer32Property* pRefTrackIdProperty = NULL;
m_pTrakAtom->FindProperty(
"trak.tref.hint.entries[0].trackId",
(MP4Property**)&pRefTrackIdProperty);
ASSERT(pRefTrackIdProperty);
m_pRefTrack = m_pFile->GetTrack(pRefTrackIdProperty->GetValue());
}
}
void MP4RtpHintTrack::InitRtpStart()
{
struct timeval tv;
gettimeofday(&tv, NULL);
srandom((tv.tv_usec << 12) | (tv.tv_sec & 0xFFF));
ASSERT(m_pTrakAtom);
m_pTrakAtom->FindProperty(
"trak.udta.hnti.rtp .snro.offset",
(MP4Property**)&m_pSnroProperty);
if (m_pSnroProperty) {
m_rtpSequenceStart = m_pSnroProperty->GetValue();
} else {
m_rtpSequenceStart = random();
}
m_pTrakAtom->FindProperty(
"trak.udta.hnti.rtp .tsro.offset",
(MP4Property**)&m_pTsroProperty);
if (m_pTsroProperty) {
m_rtpTimestampStart = m_pTsroProperty->GetValue();
} else {
m_rtpTimestampStart = random();
}
}
void MP4RtpHintTrack::ReadHint(
MP4SampleId hintSampleId,
u_int16_t* pNumPackets)
{
if (m_pRefTrack == NULL) {
InitRefTrack();
InitRtpStart();
}
// dispose of any old hint
delete m_pReadHint;
m_pReadHint = NULL;
delete m_pReadHintSample;
m_pReadHintSample = NULL;
m_readHintSampleSize = 0;
// read the desired hint sample into memory
ReadSample(
hintSampleId,
&m_pReadHintSample,
&m_readHintSampleSize,
&m_readHintTimestamp);
m_pFile->EnableMemoryBuffer(m_pReadHintSample, m_readHintSampleSize);
m_pReadHint = new MP4RtpHint(this);
m_pReadHint->Read(m_pFile);
m_pFile->DisableMemoryBuffer();
if (pNumPackets) {
*pNumPackets = GetHintNumberOfPackets();
}
}
u_int16_t MP4RtpHintTrack::GetHintNumberOfPackets()
{
if (m_pReadHint == NULL) {
throw new MP4Error("no hint has been read",
"MP4GetRtpHintNumberOfPackets");
}
return m_pReadHint->GetNumberOfPackets();
}
bool MP4RtpHintTrack::GetPacketBFrame(u_int16_t packetIndex)
{
if (m_pReadHint == NULL) {
throw new MP4Error("no hint has been read",
"MP4GetRtpPacketBFrame");
}
MP4RtpPacket* pPacket =
m_pReadHint->GetPacket(packetIndex);
return pPacket->IsBFrame();
}
u_int16_t MP4RtpHintTrack::GetPacketTransmitOffset(u_int16_t packetIndex)
{
if (m_pReadHint == NULL) {
throw new MP4Error("no hint has been read",
"MP4GetRtpPacketTransmitOffset");
}
MP4RtpPacket* pPacket =
m_pReadHint->GetPacket(packetIndex);
return pPacket->GetTransmitOffset();
}
void MP4RtpHintTrack::ReadPacket(
u_int16_t packetIndex,
u_int8_t** ppBytes,
u_int32_t* pNumBytes,
u_int32_t ssrc,
bool addHeader,
bool addPayload)
{
if (m_pReadHint == NULL) {
throw new MP4Error("no hint has been read",
"MP4ReadRtpPacket");
}
if (!addHeader && !addPayload) {
throw new MP4Error("no data requested",
"MP4ReadRtpPacket");
}
MP4RtpPacket* pPacket =
m_pReadHint->GetPacket(packetIndex);
*pNumBytes = 0;
if (addHeader) {
*pNumBytes += 12;
}
if (addPayload) {
*pNumBytes += pPacket->GetDataSize();
}
// if needed, allocate the packet memory
bool buffer_malloc = false;
if (*ppBytes == NULL) {
*ppBytes = (u_int8_t*)MP4Malloc(*pNumBytes);
buffer_malloc = true;
}
try {
u_int8_t* pDest = *ppBytes;
if (addHeader) {
*pDest++ =
0x80 | (pPacket->GetPBit() << 5) | (pPacket->GetXBit() << 4);
*pDest++ =
(pPacket->GetMBit() << 7) | pPacket->GetPayload();
*((u_int16_t*)pDest) =
htons(m_rtpSequenceStart + pPacket->GetSequenceNumber());
pDest += 2;
*((u_int32_t*)pDest) =
htonl(m_rtpTimestampStart + (u_int32_t)m_readHintTimestamp);
pDest += 4;
*((u_int32_t*)pDest) =
htonl(ssrc);
pDest += 4;
}
if (addPayload) {
pPacket->GetData(pDest);
}
}
catch (MP4Error* e) {
if (buffer_malloc) {
MP4Free(*ppBytes);
*ppBytes = NULL;
}
throw e;
}
VERBOSE_READ_HINT(m_pFile->GetVerbosity(),
printf("ReadPacket: %u ", packetIndex);
MP4HexDump(*ppBytes, *pNumBytes););
}
MP4Timestamp MP4RtpHintTrack::GetRtpTimestampStart()
{
if (m_pRefTrack == NULL) {
InitRefTrack();
InitRtpStart();
}
return m_rtpTimestampStart;
}
void MP4RtpHintTrack::SetRtpTimestampStart(MP4Timestamp start)
{
if (!m_pTsroProperty) {
MP4Atom* pTsroAtom =
m_pFile->AddDescendantAtoms(m_pTrakAtom, "udta.hnti.rtp .tsro");
ASSERT(pTsroAtom);
pTsroAtom->FindProperty("offset",
(MP4Property**)&m_pTsroProperty);
ASSERT(m_pTsroProperty);
}
m_pTsroProperty->SetValue(start);
m_rtpTimestampStart = start;
}
void MP4RtpHintTrack::InitPayload()
{
ASSERT(m_pTrakAtom);
if (m_pRtpMapProperty == NULL) {
m_pTrakAtom->FindProperty(
"trak.udta.hinf.payt.rtpMap",
(MP4Property**)&m_pRtpMapProperty);
}
if (m_pPayloadNumberProperty == NULL) {
m_pTrakAtom->FindProperty(
"trak.udta.hinf.payt.payloadNumber",
(MP4Property**)&m_pPayloadNumberProperty);
}
if (m_pMaxPacketSizeProperty == NULL) {
m_pTrakAtom->FindProperty(
"trak.mdia.minf.stbl.stsd.rtp .maxPacketSize",
(MP4Property**)&m_pMaxPacketSizeProperty);
}
}
void MP4RtpHintTrack::GetPayload(
char** ppPayloadName,
u_int8_t* pPayloadNumber,
u_int16_t* pMaxPayloadSize,
char **ppEncodingParams)
{
const char* pRtpMap;
char* pSlash;
u_int32_t length;
InitPayload();
if (ppPayloadName || ppEncodingParams) {
if (ppPayloadName)
*ppPayloadName = NULL;
if (ppEncodingParams)
*ppEncodingParams = NULL;
if (m_pRtpMapProperty) {
pRtpMap = m_pRtpMapProperty->GetValue();
pSlash = strchr(pRtpMap, '/');
if (pSlash) {
length = pSlash - pRtpMap;
} else {
length = strlen(pRtpMap);
}
if (ppPayloadName) {
*ppPayloadName = (char*)MP4Calloc(length + 1);
strncpy(*ppPayloadName, pRtpMap, length);
}
if (pSlash && ppEncodingParams) {
pSlash++;
pSlash = strchr(pSlash, '/');
if (pSlash != NULL) {
pSlash++;
if (pSlash != '\0') {
length = strlen(pRtpMap) - (pSlash - pRtpMap);
*ppEncodingParams = (char *)MP4Calloc(length + 1);
strncpy(*ppEncodingParams, pSlash, length);
}
}
}
}
}
if (pPayloadNumber) {
if (m_pPayloadNumberProperty) {
*pPayloadNumber = m_pPayloadNumberProperty->GetValue();
} else {
*pPayloadNumber = 0;
}
}
if (pMaxPayloadSize) {
if (m_pMaxPacketSizeProperty) {
*pMaxPayloadSize = m_pMaxPacketSizeProperty->GetValue();
} else {
*pMaxPayloadSize = 0;
}
}
}
void MP4RtpHintTrack::SetPayload(
const char* payloadName,
u_int8_t payloadNumber,
u_int16_t maxPayloadSize,
const char *encoding_parms,
bool include_rtp_map,
bool include_mpeg4_esid)
{
InitRefTrack();
InitPayload();
ASSERT(m_pRtpMapProperty);
ASSERT(m_pPayloadNumberProperty);
ASSERT(m_pMaxPacketSizeProperty);
size_t len = strlen(payloadName) + 16;
if (encoding_parms != NULL) {
size_t temp = strlen(encoding_parms);
if (temp == 0) {
encoding_parms = NULL;
} else {
len += temp;
}
}
char* rtpMapBuf = (char*)MP4Malloc(len);
sprintf(rtpMapBuf, "%s/%u%c%s",
payloadName,
GetTimeScale(),
encoding_parms != NULL ? '/' : '\0',
encoding_parms == NULL ? "" : encoding_parms);
m_pRtpMapProperty->SetValue(rtpMapBuf);
m_pPayloadNumberProperty->SetValue(payloadNumber);
if (maxPayloadSize == 0) {
maxPayloadSize = 1460;
}
m_pMaxPacketSizeProperty->SetValue(maxPayloadSize);
// set sdp media type
const char* sdpMediaType;
if (!strcmp(m_pRefTrack->GetType(), MP4_AUDIO_TRACK_TYPE)) {
sdpMediaType = "audio";
} else if (!strcmp(m_pRefTrack->GetType(), MP4_VIDEO_TRACK_TYPE)) {
sdpMediaType = "video";
} else {
sdpMediaType = "application";
}
char* sdpBuf = (char*)MP4Malloc(
strlen(sdpMediaType) + strlen(rtpMapBuf) + 256);
uint32_t buflen;
buflen = sprintf(sdpBuf,
"m=%s 0 RTP/AVP %u\015\012"
"a=control:trackID=%u\015\012",
sdpMediaType, payloadNumber,
m_trackId);
if (include_rtp_map) {
buflen += sprintf(sdpBuf + buflen,
"a=rtpmap:%u %s\015\012",
payloadNumber, rtpMapBuf);
}
if (include_mpeg4_esid) {
sprintf(sdpBuf + buflen,
"a=mpeg4-esid:%u\015\012",
m_pRefTrack->GetId());
}
MP4StringProperty* pSdpProperty = NULL;
m_pTrakAtom->FindProperty("trak.udta.hnti.sdp .sdpText",
(MP4Property**)&pSdpProperty);
ASSERT(pSdpProperty);
pSdpProperty->SetValue(sdpBuf);
// cleanup
MP4Free(rtpMapBuf);
MP4Free(sdpBuf);
}
void MP4RtpHintTrack::AddHint(bool isBFrame, u_int32_t timestampOffset)
{
// on first hint, need to lookup the reference track
if (m_writeHintId == MP4_INVALID_SAMPLE_ID) {
InitRefTrack();
InitStats();
}
if (m_pWriteHint) {
throw new MP4Error("unwritten hint is still pending", "MP4AddRtpHint");
}
m_pWriteHint = new MP4RtpHint(this);
m_pWriteHint->SetBFrame(isBFrame);
m_pWriteHint->SetTimestampOffset(timestampOffset);
m_bytesThisHint = 0;
m_writeHintId++;
}
void MP4RtpHintTrack::AddPacket(bool setMbit, int32_t transmitOffset)
{
if (m_pWriteHint == NULL) {
throw new MP4Error("no hint pending", "MP4RtpAddPacket");
}
MP4RtpPacket* pPacket = m_pWriteHint->AddPacket();
ASSERT(m_pPayloadNumberProperty);
pPacket->Set(
m_pPayloadNumberProperty->GetValue(),
m_writePacketId++,
setMbit);
pPacket->SetTransmitOffset(transmitOffset);
m_bytesThisHint += 12;
if (m_bytesThisPacket > m_pPmax->GetValue()) {
m_pPmax->SetValue(m_bytesThisPacket);
}
m_bytesThisPacket = 12;
m_pNump->IncrementValue();
m_pTrpy->IncrementValue(12); // RTP packet header size
}
void MP4RtpHintTrack::AddImmediateData(
const u_int8_t* pBytes,
u_int32_t numBytes)
{
if (m_pWriteHint == NULL) {
throw new MP4Error("no hint pending", "MP4RtpAddImmediateData");
}
MP4RtpPacket* pPacket = m_pWriteHint->GetCurrentPacket();
if (pPacket == NULL) {
throw new MP4Error("no packet pending", "MP4RtpAddImmediateData");
}
if (pBytes == NULL || numBytes == 0) {
throw new MP4Error("no data",
"AddImmediateData");
}
if (numBytes > 14) {
throw new MP4Error("data size is larger than 14 bytes",
"AddImmediateData");
}
MP4RtpImmediateData* pData = new MP4RtpImmediateData(pPacket);
pData->Set(pBytes, numBytes);
pPacket->AddData(pData);
m_bytesThisHint += numBytes;
m_bytesThisPacket += numBytes;
m_pDimm->IncrementValue(numBytes);
m_pTpyl->IncrementValue(numBytes);
m_pTrpy->IncrementValue(numBytes);
}
void MP4RtpHintTrack::AddSampleData(
MP4SampleId sampleId,
u_int32_t dataOffset,
u_int32_t dataLength)
{
if (m_pWriteHint == NULL) {
throw new MP4Error("no hint pending", "MP4RtpAddSampleData");
}
MP4RtpPacket* pPacket = m_pWriteHint->GetCurrentPacket();
if (pPacket == NULL) {
throw new MP4Error("no packet pending", "MP4RtpAddSampleData");
}
MP4RtpSampleData* pData = new MP4RtpSampleData(pPacket);
pData->SetReferenceSample(sampleId, dataOffset, dataLength);
pPacket->AddData(pData);
m_bytesThisHint += dataLength;
m_bytesThisPacket += dataLength;
m_pDmed->IncrementValue(dataLength);
m_pTpyl->IncrementValue(dataLength);
m_pTrpy->IncrementValue(dataLength);
}
void MP4RtpHintTrack::AddESConfigurationPacket()
{
if (m_pWriteHint == NULL) {
throw new MP4Error("no hint pending",
"MP4RtpAddESConfigurationPacket");
}
u_int8_t* pConfig = NULL;
u_int32_t configSize = 0;
m_pFile->GetTrackESConfiguration(m_pRefTrack->GetId(),
&pConfig, &configSize);
if (pConfig == NULL) {
return;
}
ASSERT(m_pMaxPacketSizeProperty);
if (configSize > m_pMaxPacketSizeProperty->GetValue()) {
throw new MP4Error("ES configuration is too large for RTP payload",
"MP4RtpAddESConfigurationPacket");
}
AddPacket(false);
MP4RtpPacket* pPacket = m_pWriteHint->GetCurrentPacket();
ASSERT(pPacket);
// This is ugly!
// To get the ES configuration data somewhere known
// we create a sample data reference that points to
// this hint track (not the media track)
// and this sample of the hint track
// the offset into this sample is filled in during the write process
MP4RtpSampleData* pData = new MP4RtpSampleData(pPacket);
pData->SetEmbeddedImmediate(m_writeSampleId, pConfig, configSize);
pPacket->AddData(pData);
m_bytesThisHint += configSize;
m_bytesThisPacket += configSize;
m_pTpyl->IncrementValue(configSize);
m_pTrpy->IncrementValue(configSize);
}
void MP4RtpHintTrack::WriteHint(MP4Duration duration, bool isSyncSample)
{
if (m_pWriteHint == NULL) {
throw new MP4Error("no hint pending", "MP4WriteRtpHint");
}
u_int8_t* pBytes;
u_int64_t numBytes;
m_pFile->EnableMemoryBuffer();
m_pWriteHint->Write(m_pFile);
m_pFile->DisableMemoryBuffer(&pBytes, &numBytes);
WriteSample(pBytes, numBytes, duration, 0, isSyncSample);
MP4Free(pBytes);
// update statistics
if (m_bytesThisPacket > m_pPmax->GetValue()) {
m_pPmax->SetValue(m_bytesThisPacket);
}
if (duration > m_pDmax->GetValue()) {
m_pDmax->SetValue(duration);
}
MP4Timestamp startTime;
GetSampleTimes(m_writeHintId, &startTime, NULL);
if (startTime < m_thisSec + GetTimeScale()) {
m_bytesThisSec += m_bytesThisHint;
} else {
if (m_bytesThisSec > m_pMaxr->GetValue()) {
m_pMaxr->SetValue(m_bytesThisSec);
}
m_thisSec = startTime - (startTime % GetTimeScale());
m_bytesThisSec = m_bytesThisHint;
}
// cleanup
delete m_pWriteHint;
m_pWriteHint = NULL;
}
void MP4RtpHintTrack::FinishWrite()
{
if (m_writeHintId != MP4_INVALID_SAMPLE_ID) {
m_pMaxPdu->SetValue(m_pPmax->GetValue());
if (m_pNump->GetValue()) {
m_pAvgPdu->SetValue(m_pTrpy->GetValue() / m_pNump->GetValue());
}
m_pMaxBitRate->SetValue(m_pMaxr->GetValue() * 8);
if (GetDuration()) {
m_pAvgBitRate->SetValue(
m_pTrpy->GetValue() * 8 * GetTimeScale() / GetDuration());
}
}
MP4Track::FinishWrite();
}
void MP4RtpHintTrack::InitStats()
{
MP4Atom* pHinfAtom = m_pTrakAtom->FindAtom("trak.udta.hinf");
ASSERT(pHinfAtom);
pHinfAtom->FindProperty("hinf.trpy.bytes", (MP4Property**)&m_pTrpy);
pHinfAtom->FindProperty("hinf.nump.packets", (MP4Property**)&m_pNump);
pHinfAtom->FindProperty("hinf.tpyl.bytes", (MP4Property**)&m_pTpyl);
pHinfAtom->FindProperty("hinf.maxr.bytes", (MP4Property**)&m_pMaxr);
pHinfAtom->FindProperty("hinf.dmed.bytes", (MP4Property**)&m_pDmed);
pHinfAtom->FindProperty("hinf.dimm.bytes", (MP4Property**)&m_pDimm);
pHinfAtom->FindProperty("hinf.pmax.bytes", (MP4Property**)&m_pPmax);
pHinfAtom->FindProperty("hinf.dmax.milliSecs", (MP4Property**)&m_pDmax);
MP4Atom* pHmhdAtom = m_pTrakAtom->FindAtom("trak.mdia.minf.hmhd");
ASSERT(pHmhdAtom);
pHmhdAtom->FindProperty("hmhd.maxPduSize", (MP4Property**)&m_pMaxPdu);
pHmhdAtom->FindProperty("hmhd.avgPduSize", (MP4Property**)&m_pAvgPdu);
pHmhdAtom->FindProperty("hmhd.maxBitRate", (MP4Property**)&m_pMaxBitRate);
pHmhdAtom->FindProperty("hmhd.avgBitRate", (MP4Property**)&m_pAvgBitRate);
MP4Integer32Property* pMaxrPeriod = NULL;
pHinfAtom->FindProperty("hinf.maxr.granularity",
(MP4Property**)&pMaxrPeriod);
if (pMaxrPeriod) {
pMaxrPeriod->SetValue(1000); // 1 second
}
}
MP4RtpHint::MP4RtpHint(MP4RtpHintTrack* pTrack)
{
m_pTrack = pTrack;
AddProperty( /* 0 */
new MP4Integer16Property("packetCount"));
AddProperty( /* 1 */
new MP4Integer16Property("reserved"));
}
MP4RtpHint::~MP4RtpHint()
{
for (u_int32_t i = 0; i < m_rtpPackets.Size(); i++) {
delete m_rtpPackets[i];
}
}
MP4RtpPacket* MP4RtpHint::AddPacket()
{
MP4RtpPacket* pPacket = new MP4RtpPacket(this);
m_rtpPackets.Add(pPacket);
// packetCount property
((MP4Integer16Property*)m_pProperties[0])->IncrementValue();
pPacket->SetBFrame(m_isBFrame);
pPacket->SetTimestampOffset(m_timestampOffset);
return pPacket;
}
void MP4RtpHint::Read(MP4File* pFile)
{
// call base class Read for required properties
MP4Container::Read(pFile);
u_int16_t numPackets =
((MP4Integer16Property*)m_pProperties[0])->GetValue();
for (u_int16_t i = 0; i < numPackets; i++) {
MP4RtpPacket* pPacket = new MP4RtpPacket(this);
m_rtpPackets.Add(pPacket);
pPacket->Read(pFile);
}
VERBOSE_READ_HINT(pFile->GetVerbosity(),
printf("ReadHint:\n"); Dump(stdout, 10, false););
}
void MP4RtpHint::Write(MP4File* pFile)
{
u_int64_t hintStartPos = pFile->GetPosition();
MP4Container::Write(pFile);
u_int64_t packetStartPos = pFile->GetPosition();
u_int32_t i;
// first write out packet (and data) entries
for (i = 0; i < m_rtpPackets.Size(); i++) {
m_rtpPackets[i]->Write(pFile);
}
// now let packets write their extra data into the hint sample
for (i = 0; i < m_rtpPackets.Size(); i++) {
m_rtpPackets[i]->WriteEmbeddedData(pFile, hintStartPos);
}
u_int64_t endPos = pFile->GetPosition();
pFile->SetPosition(packetStartPos);
// finally rewrite the packet and data entries
// which now contain the correct offsets for the embedded data
for (i = 0; i < m_rtpPackets.Size(); i++) {
m_rtpPackets[i]->Write(pFile);
}
pFile->SetPosition(endPos);
VERBOSE_WRITE_HINT(pFile->GetVerbosity(),
printf("WriteRtpHint:\n"); Dump(stdout, 14, false));
}
void MP4RtpHint::Dump(FILE* pFile, u_int8_t indent, bool dumpImplicits)
{
MP4Container::Dump(pFile, indent, dumpImplicits);
for (u_int32_t i = 0; i < m_rtpPackets.Size(); i++) {
Indent(pFile, indent);
fprintf(pFile, "RtpPacket: %u\n", i);
m_rtpPackets[i]->Dump(pFile, indent + 1, dumpImplicits);
}
}
MP4RtpPacket::MP4RtpPacket(MP4RtpHint* pHint)
{
m_pHint = pHint;
AddProperty( /* 0 */
new MP4Integer32Property("relativeXmitTime"));
AddProperty( /* 1 */
new MP4BitfieldProperty("reserved1", 2));
AddProperty( /* 2 */
new MP4BitfieldProperty("Pbit", 1));
AddProperty( /* 3 */
new MP4BitfieldProperty("Xbit", 1));
AddProperty( /* 4 */
new MP4BitfieldProperty("reserved2", 4));
AddProperty( /* 5 */
new MP4BitfieldProperty("Mbit", 1));
AddProperty( /* 6 */
new MP4BitfieldProperty("payloadType", 7));
AddProperty( /* 7 */
new MP4Integer16Property("sequenceNumber"));
AddProperty( /* 8 */
new MP4BitfieldProperty("reserved3", 13));
AddProperty( /* 9 */
new MP4BitfieldProperty("extraFlag", 1));
AddProperty( /* 10 */
new MP4BitfieldProperty("bFrameFlag", 1));
AddProperty( /* 11 */
new MP4BitfieldProperty("repeatFlag", 1));
AddProperty( /* 12 */
new MP4Integer16Property("entryCount"));
}
MP4RtpPacket::~MP4RtpPacket()
{
for (u_int32_t i = 0; i < m_rtpData.Size(); i++) {
delete m_rtpData[i];
}
}
void MP4RtpPacket::AddExtraProperties()
{
AddProperty( /* 13 */
new MP4Integer32Property("extraInformationLength"));
// This is a bit of a hack, since the tlv entries are really defined
// as atoms but there is only one type defined now, rtpo, and getting
// our atom code hooked up here would be a major pain with little gain
AddProperty( /* 14 */
new MP4Integer32Property("tlvLength"));
AddProperty( /* 15 */
new MP4StringProperty("tlvType"));
AddProperty( /* 16 */
new MP4Integer32Property("timestampOffset"));
((MP4Integer32Property*)m_pProperties[13])->SetValue(16);
((MP4Integer32Property*)m_pProperties[14])->SetValue(12);
((MP4StringProperty*)m_pProperties[15])->SetFixedLength(4);
((MP4StringProperty*)m_pProperties[15])->SetValue("rtpo");
}
void MP4RtpPacket::Read(MP4File* pFile)
{
// call base class Read for required properties
MP4Container::Read(pFile);
// read extra info if present
// we only support the rtpo field!
if (((MP4BitfieldProperty*)m_pProperties[9])->GetValue() == 1) {
ReadExtra(pFile);
}
u_int16_t numDataEntries =
((MP4Integer16Property*)m_pProperties[12])->GetValue();
// read data entries
for (u_int16_t i = 0; i < numDataEntries; i++) {
u_int8_t dataType;
pFile->PeekBytes(&dataType, 1);
MP4RtpData* pData;
switch (dataType) {
case 0:
pData = new MP4RtpNullData(this);
break;
case 1:
pData = new MP4RtpImmediateData(this);
break;
case 2:
pData = new MP4RtpSampleData(this);
break;
case 3:
pData = new MP4RtpSampleDescriptionData(this);
break;
default:
throw new MP4Error("unknown packet data entry type",
"MP4ReadHint");
}
m_rtpData.Add(pData);
// read data entry's properties
pData->Read(pFile);
}
}
void MP4RtpPacket::ReadExtra(MP4File* pFile)
{
AddExtraProperties();
int32_t extraLength = (int32_t)pFile->ReadUInt32();
if (extraLength < 4) {
throw new MP4Error("bad packet extra info length",
"MP4RtpPacket::ReadExtra");
}
extraLength -= 4;
while (extraLength > 0) {
u_int32_t entryLength = pFile->ReadUInt32();
u_int32_t entryTag = pFile->ReadUInt32();
if (entryLength < 8) {
throw new MP4Error("bad packet extra info entry length",
"MP4RtpPacket::ReadExtra");
}
if (entryTag == STRTOINT32("rtpo") && entryLength == 12) {
// read the rtp timestamp offset
m_pProperties[16]->Read(pFile);
} else {
// ignore it, LATER carry it along
pFile->SetPosition(pFile->GetPosition() + entryLength - 8);
}
extraLength -= entryLength;
}
if (extraLength < 0) {
throw new MP4Error("invalid packet extra info length",
"MP4RtpPacket::ReadExtra");
}
}
void MP4RtpPacket::Set(u_int8_t payloadNumber,
u_int32_t packetId, bool setMbit)
{
((MP4BitfieldProperty*)m_pProperties[5])->SetValue(setMbit);
((MP4BitfieldProperty*)m_pProperties[6])->SetValue(payloadNumber);
((MP4Integer16Property*)m_pProperties[7])->SetValue(packetId);
}
int32_t MP4RtpPacket::GetTransmitOffset()
{
return ((MP4Integer32Property*)m_pProperties[0])->GetValue();
}
void MP4RtpPacket::SetTransmitOffset(int32_t transmitOffset)
{
((MP4Integer32Property*)m_pProperties[0])->SetValue(transmitOffset);
}
bool MP4RtpPacket::GetPBit()
{
return ((MP4BitfieldProperty*)m_pProperties[2])->GetValue();
}
bool MP4RtpPacket::GetXBit()
{
return ((MP4BitfieldProperty*)m_pProperties[3])->GetValue();
}
bool MP4RtpPacket::GetMBit()
{
return ((MP4BitfieldProperty*)m_pProperties[5])->GetValue();
}
u_int8_t MP4RtpPacket::GetPayload()
{
return ((MP4BitfieldProperty*)m_pProperties[6])->GetValue();
}
u_int16_t MP4RtpPacket::GetSequenceNumber()
{
return ((MP4Integer16Property*)m_pProperties[7])->GetValue();
}
bool MP4RtpPacket::IsBFrame()
{
return ((MP4BitfieldProperty*)m_pProperties[10])->GetValue();
}
void MP4RtpPacket::SetBFrame(bool isBFrame)
{
((MP4BitfieldProperty*)m_pProperties[10])->SetValue(isBFrame);
}
void MP4RtpPacket::SetTimestampOffset(u_int32_t timestampOffset)
{
if (timestampOffset == 0) {
return;
}
ASSERT(((MP4BitfieldProperty*)m_pProperties[9])->GetValue() == 0);
// set X bit
((MP4BitfieldProperty*)m_pProperties[9])->SetValue(1);
AddExtraProperties();
((MP4Integer32Property*)m_pProperties[16])->SetValue(timestampOffset);
}
void MP4RtpPacket::AddData(MP4RtpData* pData)
{
m_rtpData.Add(pData);
// increment entry count property
((MP4Integer16Property*)m_pProperties[12])->IncrementValue();
}
u_int32_t MP4RtpPacket::GetDataSize()
{
u_int32_t totalDataSize = 0;
for (u_int32_t i = 0; i < m_rtpData.Size(); i++) {
totalDataSize += m_rtpData[i]->GetDataSize();
}
return totalDataSize;
}
void MP4RtpPacket::GetData(u_int8_t* pDest)
{
for (u_int32_t i = 0; i < m_rtpData.Size(); i++) {
m_rtpData[i]->GetData(pDest);
pDest += m_rtpData[i]->GetDataSize();
}
}
void MP4RtpPacket::Write(MP4File* pFile)
{
MP4Container::Write(pFile);
for (u_int32_t i = 0; i < m_rtpData.Size(); i++) {
m_rtpData[i]->Write(pFile);
}
}
void MP4RtpPacket::WriteEmbeddedData(MP4File* pFile, u_int64_t startPos)
{
for (u_int32_t i = 0; i < m_rtpData.Size(); i++) {
m_rtpData[i]->WriteEmbeddedData(pFile, startPos);
}
}
void MP4RtpPacket::Dump(FILE* pFile, u_int8_t indent, bool dumpImplicits)
{
MP4Container::Dump(pFile, indent, dumpImplicits);
for (u_int32_t i = 0; i < m_rtpData.Size(); i++) {
Indent(pFile, indent);
fprintf(pFile, "RtpData: %u\n", i);
m_rtpData[i]->Dump(pFile, indent + 1, dumpImplicits);
}
}
MP4RtpData::MP4RtpData(MP4RtpPacket* pPacket)
{
m_pPacket = pPacket;
AddProperty( /* 0 */
new MP4Integer8Property("type"));
}
MP4Track* MP4RtpData::FindTrackFromRefIndex(u_int8_t refIndex)
{
MP4Track* pTrack;
if (refIndex == (u_int8_t)-1) {
// ourselves
pTrack = GetPacket()->GetHint()->GetTrack();
} else if (refIndex == 0) {
// our reference track
pTrack = GetPacket()->GetHint()->GetTrack()->GetRefTrack();
} else {
// some other track
MP4RtpHintTrack* pHintTrack =
GetPacket()->GetHint()->GetTrack();
MP4Atom* pTrakAtom = pHintTrack->GetTrakAtom();
ASSERT(pTrakAtom);
MP4Integer32Property* pTrackIdProperty = NULL;
pTrakAtom->FindProperty(
"trak.tref.hint.entries",
(MP4Property**)&pTrackIdProperty);
ASSERT(pTrackIdProperty);
u_int32_t refTrackId =
pTrackIdProperty->GetValue(refIndex - 1);
pTrack = pHintTrack->GetFile()->GetTrack(refTrackId);
}
return pTrack;
}
MP4RtpNullData::MP4RtpNullData(MP4RtpPacket* pPacket)
: MP4RtpData(pPacket)
{
((MP4Integer8Property*)m_pProperties[0])->SetValue(0);
AddProperty( /* 1 */
new MP4BytesProperty("pad", 15));
((MP4BytesProperty*)m_pProperties[1])->SetFixedSize(15);
}
MP4RtpImmediateData::MP4RtpImmediateData(MP4RtpPacket* pPacket)
: MP4RtpData(pPacket)
{
((MP4Integer8Property*)m_pProperties[0])->SetValue(1);
AddProperty( /* 1 */
new MP4Integer8Property("count"));
AddProperty( /* 2 */
new MP4BytesProperty("data", 14));
((MP4BytesProperty*)m_pProperties[2])->SetFixedSize(14);
}
void MP4RtpImmediateData::Set(const u_int8_t* pBytes, u_int8_t numBytes)
{
((MP4Integer8Property*)m_pProperties[1])->SetValue(numBytes);
((MP4BytesProperty*)m_pProperties[2])->SetValue(pBytes, numBytes);
}
u_int16_t MP4RtpImmediateData::GetDataSize()
{
return ((MP4Integer8Property*)m_pProperties[1])->GetValue();
}
void MP4RtpImmediateData::GetData(u_int8_t* pDest)
{
u_int8_t* pValue;
u_int32_t valueSize;
((MP4BytesProperty*)m_pProperties[2])->GetValue(&pValue, &valueSize);
memcpy(pDest, pValue, GetDataSize());
MP4Free(pValue);
}
MP4RtpSampleData::MP4RtpSampleData(MP4RtpPacket* pPacket)
: MP4RtpData(pPacket)
{
((MP4Integer8Property*)m_pProperties[0])->SetValue(2);
AddProperty( /* 1 */
new MP4Integer8Property("trackRefIndex"));
AddProperty( /* 2 */
new MP4Integer16Property("length"));
AddProperty( /* 3 */
new MP4Integer32Property("sampleNumber"));
AddProperty( /* 4 */
new MP4Integer32Property("sampleOffset"));
AddProperty( /* 5 */
new MP4Integer16Property("bytesPerBlock"));
AddProperty( /* 6 */
new MP4Integer16Property("samplesPerBlock"));
((MP4Integer16Property*)m_pProperties[5])->SetValue(1);
((MP4Integer16Property*)m_pProperties[6])->SetValue(1);
m_pRefData = NULL;
m_pRefTrack = NULL;
m_refSampleId = MP4_INVALID_SAMPLE_ID;
m_refSampleOffset = 0;
}
void MP4RtpSampleData::SetEmbeddedImmediate(MP4SampleId sampleId,
u_int8_t* pData, u_int16_t dataLength)
{
((MP4Integer8Property*)m_pProperties[1])->SetValue((u_int8_t)-1);
((MP4Integer16Property*)m_pProperties[2])->SetValue(dataLength);
((MP4Integer32Property*)m_pProperties[3])->SetValue(sampleId);
((MP4Integer32Property*)m_pProperties[4])->SetValue(0);
CHECK_AND_FREE(m_pRefData);
m_pRefData = pData;
}
void MP4RtpSampleData::SetReferenceSample(
MP4SampleId refSampleId, u_int32_t refSampleOffset,
u_int16_t sampleLength)
{
((MP4Integer8Property*)m_pProperties[1])->SetValue(0);
((MP4Integer16Property*)m_pProperties[2])->SetValue(sampleLength);
((MP4Integer32Property*)m_pProperties[3])->SetValue(refSampleId);
((MP4Integer32Property*)m_pProperties[4])->SetValue(refSampleOffset);
}
void MP4RtpSampleData::SetEmbeddedSample(
MP4SampleId sampleId, MP4Track* pRefTrack,
MP4SampleId refSampleId, u_int32_t refSampleOffset,
u_int16_t sampleLength)
{
((MP4Integer8Property*)m_pProperties[1])->SetValue((u_int8_t)-1);
((MP4Integer16Property*)m_pProperties[2])->SetValue(sampleLength);
((MP4Integer32Property*)m_pProperties[3])->SetValue(sampleId);
((MP4Integer32Property*)m_pProperties[4])->SetValue(0);
m_pRefTrack = pRefTrack;
m_refSampleId = refSampleId;
m_refSampleOffset = refSampleOffset;
}
u_int16_t MP4RtpSampleData::GetDataSize()
{
return ((MP4Integer16Property*)m_pProperties[2])->GetValue();
}
void MP4RtpSampleData::GetData(u_int8_t* pDest)
{
u_int8_t trackRefIndex =
((MP4Integer8Property*)m_pProperties[1])->GetValue();
MP4Track* pSampleTrack =
FindTrackFromRefIndex(trackRefIndex);
pSampleTrack->ReadSampleFragment(
((MP4Integer32Property*)m_pProperties[3])->GetValue(), // sampleId
((MP4Integer32Property*)m_pProperties[4])->GetValue(), // sampleOffset
((MP4Integer16Property*)m_pProperties[2])->GetValue(), // sampleLength
pDest);
}
void MP4RtpSampleData::WriteEmbeddedData(MP4File* pFile, u_int64_t startPos)
{
// if not using embedded data, nothing to do
if (((MP4Integer8Property*)m_pProperties[1])->GetValue() != (u_int8_t)-1) {
return;
}
// figure out the offset within this hint sample for this embedded data
u_int64_t offset = pFile->GetPosition() - startPos;
ASSERT(offset <= 0xFFFFFFFF);
((MP4Integer32Property*)m_pProperties[4])->SetValue((u_int32_t)offset);
u_int16_t length = ((MP4Integer16Property*)m_pProperties[2])->GetValue();
if (m_pRefData) {
pFile->WriteBytes(m_pRefData, length);
return;
}
if (m_refSampleId != MP4_INVALID_SAMPLE_ID) {
u_int8_t* pSample = NULL;
u_int32_t sampleSize = 0;
ASSERT(m_pRefTrack);
m_pRefTrack->ReadSample(m_refSampleId, &pSample, &sampleSize);
ASSERT(m_refSampleOffset + length <= sampleSize);
pFile->WriteBytes(&pSample[m_refSampleOffset], length);
MP4Free(pSample);
return;
}
}
MP4RtpSampleDescriptionData::MP4RtpSampleDescriptionData(MP4RtpPacket* pPacket)
: MP4RtpData(pPacket)
{
((MP4Integer8Property*)m_pProperties[0])->SetValue(3);
AddProperty( /* 1 */
new MP4Integer8Property("trackRefIndex"));
AddProperty( /* 2 */
new MP4Integer16Property("length"));
AddProperty( /* 3 */
new MP4Integer32Property("sampleDescriptionIndex"));
AddProperty( /* 4 */
new MP4Integer32Property("sampleDescriptionOffset"));
AddProperty( /* 5 */
new MP4Integer32Property("reserved"));
}
void MP4RtpSampleDescriptionData::Set(u_int32_t sampleDescrIndex,
u_int32_t offset, u_int16_t length)
{
((MP4Integer16Property*)m_pProperties[2])->SetValue(length);
((MP4Integer32Property*)m_pProperties[3])->SetValue(sampleDescrIndex);
((MP4Integer32Property*)m_pProperties[4])->SetValue(offset);
}
u_int16_t MP4RtpSampleDescriptionData::GetDataSize()
{
return ((MP4Integer16Property*)m_pProperties[2])->GetValue();
}
void MP4RtpSampleDescriptionData::GetData(u_int8_t* pDest)
{
// we start with the index into our track references
u_int8_t trackRefIndex =
((MP4Integer8Property*)m_pProperties[1])->GetValue();
// from which we can find the track structure
MP4Track* pSampleTrack =
FindTrackFromRefIndex(trackRefIndex);
// next find the desired atom in the track's sample description table
u_int32_t sampleDescrIndex =
((MP4Integer32Property*)m_pProperties[3])->GetValue();
MP4Atom* pTrakAtom =
pSampleTrack->GetTrakAtom();
char sdName[64];
sprintf(sdName, "trak.mdia.minf.stbl.stsd.*[%u]", sampleDescrIndex);
MP4Atom* pSdAtom =
pTrakAtom->FindAtom(sdName);
// bad reference
if (pSdAtom == NULL) {
throw new MP4Error("invalid sample description index",
"MP4RtpSampleDescriptionData::GetData");
}
// check validity of the upcoming copy
u_int16_t length =
((MP4Integer16Property*)m_pProperties[2])->GetValue();
u_int32_t offset =
((MP4Integer32Property*)m_pProperties[4])->GetValue();
if (offset + length > pSdAtom->GetSize()) {
throw new MP4Error("offset and/or length are too large",
"MP4RtpSampleDescriptionData::GetData");
}
// now we use the raw file to get the desired bytes
MP4File* pFile = GetPacket()->GetHint()->GetTrack()->GetFile();
u_int64_t orgPos = pFile->GetPosition();
// It's not entirely clear from the spec whether the offset is from
// the start of the sample descirption atom, or the start of the atom's
// data. I believe it is the former, but the commented out code will
// realize the latter interpretation if I turn out to be wrong.
u_int64_t dataPos = pSdAtom->GetStart();
//u_int64_t dataPos = pSdAtom->GetEnd() - pSdAtom->GetSize();
pFile->SetPosition(dataPos + offset);
pFile->ReadBytes(pDest, length);
pFile->SetPosition(orgPos);
}