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#include "stdafx.h"
#include <streams.h>
#include <mpeg2data.h>
#include "..\..\DSUtil\GolombBuffer.h"
#include "Mpeg2SectionData.h"
#define BeginEnumDescriptors(gb, nType, nLength) \
{ \
BYTE DescBuffer[256]; \
int nLimit = gb.BitRead(12)+gb.GetPos(); \
while (gb.GetPos() < nLimit) \
{ \
MPEG2_DESCRIPTOR nType = (MPEG2_DESCRIPTOR)gb.BitRead(8); \
WORD nLength = gb.BitRead(8);
#define SkipDescriptor(gb, nType, nLength) \
gb.ReadBuffer(DescBuffer, nLength); \
TRACE ("Skipped descriptor : 0x%02x\n", nType);
#define EndEnumDescriptors }}
CMpeg2DataParser::CMpeg2DataParser(IBaseFilter* pFilter)
{
m_pData = pFilter;
memset(&m_Filter, 0, sizeof(m_Filter));
m_Filter.bVersionNumber = 1;
m_Filter.wFilterSize = MPEG2_FILTER_VERSION_1_SIZE;
m_Filter.fSpecifySectionNumber = TRUE;
}
CString CMpeg2DataParser::ConvertString (BYTE* pBuffer, int nLength)
{
static const UINT16 codepages[0x20] =
{
28591, // 00 - ISO 8859-1 Latin I
28595, // 01 - ISO 8859-5 Cyrillic
28596, // 02 - ISO 8859-6 Arabic
28597, // 03 - ISO 8859-7 Greek
28598, // 04 - ISO 8859-8 Hebrew
28599, // 05 - ISO 8859-9 Latin 5
28591, // 06 - ??? - ISO/IEC 8859-10 - Latin alphabet No. 6
28591, // 07 - ??? - ISO/IEC 8859-11 - Latin/Thai (draft only)
28591, // 08 - ??? - ISO/IEC 8859-12 - possibly reserved for Indian
28591, // 09 - ??? - ISO/IEC 8859-13 - Latin alphabet No. 7
28591, // 0a - ??? - ISO/IEC 8859-14 - Latin alphabet No. 8 (Celtic)
28605, // 0b - ISO 8859-15 Latin 9
28591, // 0c - réservé
28591, // 0d - réservé
28591, // 0e - réservé
28591, // 0f - réservé
// TODO !
28591, 28591, 28591, 28591, 28591, 28591, 28591, 28591,
28591, 28591, 28591, 28591, 28591, 28591, 28591, 28591
};
UINT cp = CP_ACP;
int nDestSize;
CString strResult;
if (nLength>0 && pBuffer[0]<0x20)
{
cp = codepages[pBuffer[0]];
pBuffer++; nLength--;
}
nDestSize = MultiByteToWideChar (cp, MB_PRECOMPOSED, (LPCSTR)pBuffer, nLength, NULL, 0);
if(nDestSize < 0) return strResult;
MultiByteToWideChar (cp, MB_PRECOMPOSED, (LPCSTR)pBuffer, nLength, strResult.GetBuffer(nLength), nDestSize);
strResult.ReleaseBuffer();
return strResult;
}
DVB_STREAM_TYPE CMpeg2DataParser::ConvertToDVBType(PES_STREAM_TYPE nType)
{
switch (nType)
{
case VIDEO_STREAM_MPEG1 :
case VIDEO_STREAM_MPEG2 :
return DVB_MPV;
case AUDIO_STREAM_MPEG1 :
case AUDIO_STREAM_MPEG2 :
return DVB_MPA;
case VIDEO_STREAM_H264 :
return DVB_H264;
case AUDIO_STREAM_AC3 :
return DVB_AC3;
case AUDIO_STREAM_AC3_PLUS :
return DVB_EAC3;
case SUBTITLE_STREAM :
return DVB_SUBTITLE;
}
return DVB_UNKNOWN;
}
HRESULT CMpeg2DataParser::ParseSIHeader(CGolombBuffer& gb, DVB_SI SIType, WORD& wSectionLength, WORD& wTSID)
{
if (gb.BitRead(8) != SIType) return ERROR_INVALID_DATA; // table_id
gb.BitRead(1); // section_syntax_indicator
gb.BitRead(1); // reserved_future_use
gb.BitRead(2); // reserved
wSectionLength = gb.BitRead(12); // section_length
wTSID = gb.BitRead(16); // transport_stream_id
gb.BitRead(2); // reserved
gb.BitRead(5); // version_number
gb.BitRead(1); // current_next_indicator
gb.BitRead(8); // section_number
gb.BitRead(8); // last_section_number
return S_OK;
}
HRESULT CMpeg2DataParser::ParseSDT(ULONG ulFreq)
{
HRESULT hr;
CComPtr<ISectionList> pSectionList;
DWORD dwLength;
PSECTION data;
WORD wTSID;
WORD wONID;
WORD wSectionLength;
CheckNoLog (m_pData->GetSection (PID_SDT, SI_SDT, &m_Filter, 5000, &pSectionList));
CheckNoLog (pSectionList->GetSectionData (0, &dwLength, &data));
CGolombBuffer gb ((BYTE*)data, dwLength);
// service_description_section()
CheckNoLog (ParseSIHeader (gb, SI_SDT, wSectionLength, wTSID));
wONID = gb.BitRead(16); // original_network_id
gb.BitRead(8); // reserved_future_use
while (gb.GetSize() - gb.GetPos() > 4)
{
CDVBChannel Channel;
Channel.SetFrequency (ulFreq);
Channel.SetTSID (wTSID);
Channel.SetONID (wONID);
Channel.SetSID (gb.BitRead(16)); // service_id uimsbf
gb.BitRead(6); // reserved_future_use bslbf
gb.BitRead(1); // EIT_schedule_flag bslbf
gb.BitRead(1); // EIT_present_following_flag bslbf
gb.BitRead(3); // running_status uimsbf
gb.BitRead(1); // free_CA_mode bslbf
BeginEnumDescriptors(gb, nType, nLength)
{
switch (nType)
{
case DT_SERVICE :
gb.BitRead(8); // service_type
nLength = gb.BitRead(8); // service_provider_name_length
gb.ReadBuffer (DescBuffer, nLength); // service_provider_name
nLength = gb.BitRead(8); // service_name_length
gb.ReadBuffer (DescBuffer, nLength); // service_name
DescBuffer[nLength] = 0;
Channel.SetName (ConvertString (DescBuffer, nLength));
TRACE ("%15S %d\n", Channel.GetName(), Channel.GetSID());
break;
default :
SkipDescriptor (gb, nType, nLength); // descriptor()
break;
}
}
EndEnumDescriptors
if (!Channels.Lookup(Channel.GetSID()))
Channels [Channel.GetSID()] = Channel;
}
return S_OK;
}
HRESULT CMpeg2DataParser::ParsePAT()
{
HRESULT hr;
CComPtr<ISectionList> pSectionList;
DWORD dwLength;
PSECTION data;
WORD wTSID;
WORD wSectionLength;
CheckNoLog (m_pData->GetSection (PID_PAT, SI_PAT, &m_Filter, 5000, &pSectionList));
CheckNoLog (pSectionList->GetSectionData (0, &dwLength, &data));
CGolombBuffer gb ((BYTE*)data, dwLength);
// program_association_section()
CheckNoLog (ParseSIHeader (gb, SI_PAT, wSectionLength, wTSID));
while (gb.GetSize() - gb.GetPos() > 4)
{
WORD program_number;
WORD program_map_PID = 0;
program_number = gb.BitRead(16); // program_number
gb.BitRead(3); // reserved
if (program_number==0)
gb.BitRead(13); // network_PID
else
{
program_map_PID = gb.BitRead(13); // program_map_PID
if (Channels.Lookup(program_number))
{
Channels [program_number].SetPMT (program_map_PID);
ParsePMT (Channels [program_number]);
}
}
}
return S_OK;
}
HRESULT CMpeg2DataParser::ParsePMT(CDVBChannel& Channel)
{
HRESULT hr;
CComPtr<ISectionList> pSectionList;
DWORD dwLength;
PSECTION data;
WORD wTSID;
WORD wSectionLength;
int nLimit;
CheckNoLog (m_pData->GetSection (Channel.GetPMT(), SI_PMT, &m_Filter, 5000, &pSectionList));
CheckNoLog (pSectionList->GetSectionData (0, &dwLength, &data));
CGolombBuffer gb ((BYTE*)data, dwLength);
// TS_program_map_section()
CheckNoLog (ParseSIHeader (gb, SI_PMT, wSectionLength, wTSID));
gb.BitRead(3); // reserved
Channel.SetPCR (gb.BitRead(13)); // PCR_PID
gb.BitRead(4); // reserved
BeginEnumDescriptors(gb, nType, nLength) // for (i=0;i<N;i++) {
{
SkipDescriptor (gb, nType, nLength); // descriptor()
}
EndEnumDescriptors
while (gb.GetSize() - gb.GetPos() > 4)
{
PES_STREAM_TYPE pes_stream_type;
DVB_STREAM_TYPE dvb_stream_type;
WORD wPID;
CString strLanguage;
pes_stream_type = (PES_STREAM_TYPE)gb.BitRead(8); // stream_type
gb.BitRead(3); // reserved
wPID = gb.BitRead(13); // elementary_PID
gb.BitRead(4); // reserved
BeginEnumDescriptors(gb, nType, nLength) // ES_info_length
{
switch (nType)
{
case DT_ISO_639_LANGUAGE :
gb.ReadBuffer(DescBuffer, nLength);
strLanguage = ConvertString (DescBuffer, 3);
break;
case DT_AC3_AUDIO :
pes_stream_type = AUDIO_STREAM_AC3;
SkipDescriptor (gb, nType, nLength);
break;
case DT_EXTENDED_AC3_AUDIO :
pes_stream_type = AUDIO_STREAM_AC3_PLUS;
SkipDescriptor (gb, nType, nLength);
break;
case DT_SUBTITLING :
{
gb.ReadBuffer(DescBuffer, nLength);
strLanguage = ConvertString (DescBuffer, 3);
pes_stream_type = SUBTITLE_STREAM;
}
break;
default :
SkipDescriptor (gb, nType, nLength);
break;
}
}
EndEnumDescriptors
if ((dvb_stream_type = ConvertToDVBType(pes_stream_type)) != DVB_UNKNOWN)
Channel.AddStreamInfo (wPID, dvb_stream_type, pes_stream_type, strLanguage);
}
return S_OK;
}
HRESULT CMpeg2DataParser::ParseNIT()
{
HRESULT hr;
CComPtr<ISectionList> pSectionList;
DWORD dwLength;
PSECTION data;
WORD wTSID;
WORD wSectionLength;
WORD transport_stream_loop_length;
CheckNoLog (m_pData->GetSection (PID_NIT, SI_NIT, &m_Filter, 5000, &pSectionList));
CheckNoLog (pSectionList->GetSectionData (0, &dwLength, &data));
CGolombBuffer gb ((BYTE*)data, dwLength);
// network_information_section()
CheckNoLog (ParseSIHeader (gb, SI_NIT, wSectionLength, wTSID));
gb.BitRead(4); // reserved_future_use
BeginEnumDescriptors(gb, nType, nLength) // for (i=0;i<N;i++) {
{
SkipDescriptor (gb, nType, nLength); // descriptor()
}
EndEnumDescriptors
gb.BitRead(4); // reserved_future_use
transport_stream_loop_length = gb.BitRead(12); // network_descriptors_length
while (gb.GetSize() - gb.GetPos() > 4)
{
WORD transport_stream_id = gb.BitRead(16); // transport_stream_id
WORD original_network_id = gb.BitRead(16); // original_network_id
gb.BitRead(4); // reserved_future_use
BeginEnumDescriptors (gb, nType, nLength)
{
switch (nType)
{
case DT_LOGICAL_CHANNEL :
for (int i=0; i<nLength/4; i++)
{
WORD service_id = gb.BitRead (16);
gb.BitRead(6);
WORD logical_channel_number = gb.BitRead(10);
if (Channels.Lookup(service_id))
{
Channels[service_id].SetOriginNumber (logical_channel_number);
TRACE ("NIT association : %d -> %S\n", logical_channel_number, Channels[service_id].ToString());
}
}
break;
default :
SkipDescriptor (gb, nType, nLength);
break;
}
}
EndEnumDescriptors
}
return S_OK;
}
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