int parse_pat(CZapitChannel * const channel)
{
CDemux dmx;
/* buffer for program association table */
unsigned char buffer[PAT_SIZE];
/* current positon in buffer */
unsigned short i;
unsigned char filter[DMX_FILTER_SIZE];
unsigned char mask[DMX_FILTER_SIZE];
if (!channel)
return -1;
memset(filter, 0x00, DMX_FILTER_SIZE);
memset(mask, 0x00, DMX_FILTER_SIZE);
mask[0] = 0xFF;
mask[4] = 0xFF;
do {
/* set filter for program association section */
/* read section */
if ((dmx.sectionFilter(0, filter, mask) < 0) || (dmx.read(buffer, PAT_SIZE) < 0))
return -1;
/* loop over service id / program map table pid pairs */
for (i = 8; i < (((buffer[1] & 0x0F) << 8) | buffer[2]) + 3; i += 4) {
/* compare service id */
if (channel->getServiceId() == ((buffer[i] << 8) | buffer[i+1])) {
/* store program map table pid */
channel->setPmtPid(((buffer[i+2] & 0x1F) << 8) | buffer[i+3]);
return 0;
}
}
} while (filter[4]++ != buffer[7]);
return -1;
}
int parse_nit(const t_satellite_position satellite_position, const unsigned char DiSEqC)
{
CDemux dmx;
unsigned char buffer[NIT_SIZE];
/* position in buffer */
unsigned short pos;
unsigned short pos2;
/* network_information_section elements */
unsigned short section_length;
unsigned short network_descriptors_length;
unsigned short transport_descriptors_length;
unsigned short transport_stream_loop_length;
t_transport_stream_id transport_stream_id;
t_original_network_id original_network_id;
// unsigned short network_id;
transponder_id_t transponder_id;
unsigned char filter[DMX_FILTER_SIZE];
unsigned char mask[DMX_FILTER_SIZE];
memset(filter, 0x00, DMX_FILTER_SIZE);
memset(mask, 0x00, DMX_FILTER_SIZE);
filter[0] = 0x40;
filter[4] = 0x00;
mask[0] = 0xFF;
mask[4] = 0xFF;
do {
if ((dmx.sectionFilter(0x10, filter, mask) < 0) || (dmx.read(buffer, NIT_SIZE) < 0))
return -1;
section_length = ((buffer[1] & 0x0F) << 8) + buffer[2];
// network_id = ((buffer[3] << 8)| buffer [4]);
network_descriptors_length = ((buffer[8] & 0x0F) << 8) | buffer[9];
for (pos = 10; pos < network_descriptors_length + 10; pos += buffer[pos + 1] + 2)
{
switch (buffer[pos])
{
/* case 0x0F:
Private_data_indicator_descriptor(buffer + pos);
break;
*/
case 0x40:
network_name_descriptor(buffer + pos);
break;
case 0x4A:
linkage_descriptor(buffer + pos);
break;
case 0x5B:
multilingual_network_name_descriptor(buffer + pos);
break;
/* case 0x5F:
private_data_specifier_descriptor(buffer + pos);
break;
*/
case 0x80: /* unknown, Eutelsat 13.0E */
break;
case 0x90: /* unknown, Eutelsat 13.0E */
break;
default:
DBG("first_descriptor_tag: %02x", buffer[pos]);
break;
}
}
transport_stream_loop_length = ((buffer[pos] & 0x0F) << 8) | buffer[pos + 1];
if (!transport_stream_loop_length)
continue;
for (pos += 2; pos < section_length - 3; pos += transport_descriptors_length + 6)
{
transport_stream_id = (buffer[pos] << 8) | buffer[pos + 1];
original_network_id = (buffer[pos + 2] << 8) | buffer[pos + 3];
transport_descriptors_length = ((buffer[pos + 4] & 0x0F) << 8) | buffer[pos + 5];
// frequency will be inserted in satellite/cable_delivery_system_descriptor()
transponder_id = CREATE_TRANSPONDER_ID_FROM_FREQUENCY_SATELLITEPOSITION_ORIGINALNETWORK_TRANSPORTSTREAM_ID(0, satellite_position,original_network_id,transport_stream_id);
if (transponders.find(transponder_id) == transponders.end())
{
for (pos2 = pos + 6; pos2 < pos + transport_descriptors_length + 6; pos2 += buffer[pos2 + 1] + 2)
{
switch (buffer[pos2])
{
case 0x41:
service_list_descriptor(buffer + pos2, transport_stream_id, original_network_id);
break;
case 0x42:
stuffing_descriptor(buffer + pos2);
break;
case 0x43:
if (satellite_delivery_system_descriptor(buffer + pos2, transponder_id, DiSEqC) < 0)
return -2;
break;
case 0x44:
if (cable_delivery_system_descriptor(buffer + pos2, transponder_id) < 0)
return -2;
break;
case 0x5A:
if (terrestrial_delivery_system_descriptor(buffer + pos2) < 0)
return -2;
break;
case 0x5F:
private_data_specifier_descriptor(buffer + pos2);
break;
case 0x62:
frequency_list_descriptor(buffer + pos2);
break;
case 0x82: /* unknown, Eutelsat 13.0E */
break;
default:
DBG("second_descriptor_tag: %02x", buffer[pos2]);
break;
}
}
}
}
} while (filter[4]++ != buffer[7]);
return 0;
}
void CVideoDecoder::ThreadEntry ()
{
CDemux* pDemux = mpDemux;
AVStream* pStream = mpStream;
CVideoStubRender* pVStubRender = (CVideoStubRender*)mpStubRender;
CMasterClock* pClock = mpClock;
int Ret = ERR_NONE;
int bFrameFinished = 0;
AVCodecContext *pCodecContext = NULL;
AVPacket AVPkt;
int64_t PTS;
if (pDemux == NULL || pStream == NULL || pVStubRender == NULL || pStream->codec == NULL)
{
ERROR ("mpDecoder || mpStream || mpStubRender || mpStream->codec== NULL!");
return;
}
pCodecContext = pStream->codec;
memset((void*)&AVPkt,0,sizeof(AVPacket));
DEBUG ("start video decoder loop!");
for(;;)
{
if(mbQuit)
{
INFO("mbQuit");
PlayCore::GetInstance()->avcodec_flush_buffers(pCodecContext);
break;
}
if(pDemux->GetSyncPTS()>=0.0)//已经设定了SyncPTS
{
if(!pDemux->IsSynced())//没有被音频流Sync
{
DEBUG("NO FOUND SYNCED !!");
usleep(25*1000);
continue;
}
else if(!pClock->IsRun())//已经设定SyncPTs并且被其他流sync并且当前状态不是播放状态
{
usleep(1*1000);//Reduce CPU usage
continue;
}
}
else
{
DEBUG("TRY SHOW FIRST KEY VIDEO FRAME mbFirstKeyFrame %s",mbFirstKeyFrame?"true":"false");
}
if(mbNextFrame)
{
AVPkt = pDemux->GetVideoPacket ();
if (AVPkt.data == 0 || AVPkt.size == 0)
{
INFO ("get NULL packet! continue! must be end of pStream!!! stop thread!");
break;
}
//如果A/V已经同步，但此时视频时间戳严重落后于系统时钟
if(pDemux->IsSynced()&&mbNeedReSync)
{
double CurClock = pClock->GetCurrentClock ();
double FramePTS = AVPkt.pts * av_q2d (pStream->time_base);
double Diff = FramePTS - CurClock;
DEBUG ("V:SyncOut CurClock=%f, FramePTS=%f, Diff=%f", CurClock, FramePTS, Diff);
if (Diff >= CMasterClock::AVThresholdSync)
{
DEBUG ("V:Sync CurClock=%f, FramePTS=%f, Diff=%f", CurClock, FramePTS, Diff);
}
else
{
PlayCore::GetInstance()->av_free_packet (&AVPkt);
memset((void*)&AVPkt,0,sizeof(AVPacket));
continue;
}
}
int len = CVideoDecoderImp::Decode (pCodecContext, mpFrame, &bFrameFinished, &AVPkt, &PTS);
if (len < 0 || bFrameFinished == 0)
{
WARN ("CVideoDecoderImp::Decode fail! continue to next packet!");
PlayCore::GetInstance()->av_free_packet (&AVPkt);
memset((void*)&AVPkt,0,sizeof(AVPacket));
continue;
}
DEBUG("mbFirstKeyFrame %d,key_frame %d,pict_type %d mbNeedReSync %d AV_PICTURE_TYPE_I %d",mbFirstKeyFrame,mpFrame->key_frame,mpFrame->pict_type,mbNeedReSync,AV_PICTURE_TYPE_I);
//需要关键帧
if(!pDemux->IsSynced())
{
//不是关键帧continue
if(!(mpFrame->key_frame && mpFrame->pict_type == AV_PICTURE_TYPE_I))
{
DEBUG("Not Key frame continue");
PlayCore::GetInstance()->av_free_packet (&AVPkt);
memset((void*)&AVPkt,0,sizeof(AVPacket));
continue;
}
else //第一次音视频Sync
{
INFO("First Sync after opened");
mbFirstKeyFrame = true;
}
}
else if(mbNeedReSync) //视频时间戳严重落后于系统时钟,第一个合适的关键帧
{
if(!(mpFrame->key_frame && mpFrame->pict_type == AV_PICTURE_TYPE_I))
{
DEBUG("Not Key frame continue");
PlayCore::GetInstance()->av_free_packet (&AVPkt);
memset((void*)&AVPkt,0,sizeof(AVPacket));
continue;
}
else
{
INFO("mbNeedReSync %d",mbNeedReSync);
mbNeedReSync = false;
mbFirstKeyFrame = false;
}
}
else//pDemux go on
{
mbFirstKeyFrame = false;
}
}
if (pClock)
{
double FramePTS = PTS * av_q2d (pStream->time_base);
//渲染视频首个关键帧并且不是播放过程中视频解码落后于系统时钟。设定音频同步时间点
if(mbFirstKeyFrame)
{
Ret = pVStubRender->ShowPicture (mpFrame);
INFO("IS Key frame mbFirstKeyFrame %d FramePTS %f ShowPicture Ret %d",mbFirstKeyFrame,FramePTS,Ret);
//成功渲染视频
if(Ret>=0 || Ret == ERR_DEVICE_NOSET)
{
//得到同步时间点，
double SyncPTS = pDemux->GetSyncPTS();
INFO("pDemux->GetSyncPTS() %f",SyncPTS);
if(SyncPTS<0.0)
{
//设定同步时间点
pDemux->SetSyncPTS(FramePTS);
//设定时钟的起始时间点
pClock->SetOriginClock (FramePTS);
//surface fixed
pVStubRender->ShowPicture (mpFrame);
//如果没有音频数据流设定为Synced;
if(pDemux->GetAudioStreamIndex()<0)
{
pDemux->SetSynced(true);
}
mbFirstKeyFrame = false;
mbNextFrame = true;
}
}
}
else
{
double CurClock = pClock->GetCurrentClock ();
double Diff = FramePTS - CurClock;
DEBUG ("V:CurClock=%f, FramePTS=%f, Diff=%f", CurClock, FramePTS, Diff);
if (fabs(Diff) < CMasterClock::AVThresholdNoSync)
{
mbNextFrame = true;
if (Diff <= 0)
{
VERBOSE ("show it at once.");
}
else
{
unsigned int usec = Diff * 1000 * 1000;
VERBOSE ("wait %d usec", usec);
usleep (usec);
}
Ret = pVStubRender->ShowPicture (mpFrame);
}
else
{
if (Diff < 0)
{
mbNextFrame = true;
//如果系统时钟是以视频时钟为基准的，调整系统时钟
if(pClock->GetClockType()==CMasterClock::CLOCK_VIDEO)
{
WARN("we reset master timer to video FramePTS");
double ClockTime = PlayCore::GetInstance()->av_gettime() / 1000000.0;
pClock->SetOriginClock (FramePTS, ClockTime);
Ret = pVStubRender->ShowPicture (mpFrame);
}
else//否则是以其他(音频，系统时间)为系统时钟，此时视频严重落后于同步的时间范围值，
{ //对于直播不需要设定需要查找最近的关键帧标识
DEBUG("we need ReSync video FramePTS Diff %f",Diff);
}
}
else
{
WARN ("video FramePTS far early than curr_pts Diff %f",Diff);
unsigned int usec = Diff * 1000 * 1000;
mbNextFrame = false;
usleep (1*1000);
}
}
DEBUG("ShowPicture Ret %d",Ret);
}
}
else
{
ERROR ("you have not set Master Clock!!! will not show pictures!");
}
PlayCore::GetInstance()->av_free_packet (&AVPkt);
memset((void*)&AVPkt,0,sizeof(AVPacket));
}
Reset();
if (AVPkt.data != 0)
{
PlayCore::GetInstance()->av_free_packet (&AVPkt);
}
DEBUG ("end of video out thread!");
}
