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for #250, decode the PMT and PAT
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winlin
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7692e50fc2
commit
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3 changed files with 457 additions and 129 deletions
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@ -30,6 +30,8 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#include <srs_core.hpp>
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#include <string>
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#include <map>
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#include <vector>
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#include <srs_kernel_codec.hpp>
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@ -64,15 +66,22 @@ public:
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/**
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* the pid of ts packet,
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* Table 2-3 ¨C PID table, hls-mpeg-ts-iso13818-1.pdf, page 37
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* NOTE ¨C The transport packets with PID values 0x0000, 0x0001, and 0x0010-0x1FFE are allowed to carry a PCR.
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*/
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enum SrsTsPid
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{
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// Program Association Table(see Table 2-25).
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SrsTsPidPAT = 0x00,
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SrsTsPidPAT = 0x00,
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// Conditional Access Table (see Table 2-27).
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SrsTsPidCAT = 0x01,
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SrsTsPidCAT = 0x01,
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// Transport Stream Description Table
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SrsTsPidTSDT = 0x02,
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SrsTsPidTSDT = 0x02,
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// Reserved
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SrsTsPidReservedStart = 0x03,
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SrsTsPidReservedEnd = 0x0f,
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// May be assigned as network_PID, Program_map_PID, elementary_PID, or for other purposes
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SrsTsPidAppStart = 0x10,
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SrsTsPidAppEnd = 0x1ffe,
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// null packets (see Table 2-3)
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SrsTsPidNULL = 0x01FFF,
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};
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@ -109,11 +118,28 @@ enum SrsTsAdaptationFieldType
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SrsTsAdaptationFieldTypeBoth = 0x03,
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};
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/**
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* the actually parsed ts pid,
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* @see SrsTsPid, some pid, for example, PMT/Video/Audio is specified by PAT or other tables.
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*/
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enum SrsTsPidApply
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{
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SrsTsPidApplyReserved = 0, // TSPidTypeReserved, nothing parsed, used reserved.
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SrsTsPidApplyPAT, // Program associtate table
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SrsTsPidApplyPMT, // Program map table.
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SrsTsPidApplyVideo, // for video
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SrsTsPidApplyAudio, // vor audio
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};
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/**
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* the context of ts, to decode the ts stream.
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*/
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class SrsTsContext
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{
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private:
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std::map<int, SrsTsPidApply> pids;
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public:
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SrsTsContext();
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virtual ~SrsTsContext();
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@ -123,6 +149,16 @@ public:
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* @remark we will consume all bytes in stream.
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*/
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virtual int decode(SrsStream* stream);
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public:
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/**
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* get the pid apply, the parsed pid.
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* @return the apply pid; SrsTsPidApplyReserved for invalid.
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*/
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virtual SrsTsPidApply get(int pid);
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/**
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* set the pid apply, the parsed pid.
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*/
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virtual void set(int pid, SrsTsPidApply apply_pid);
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};
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/**
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@ -204,7 +240,7 @@ public:
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/**
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* The continuity_counter is a 4-bit field incrementing with each Transport Stream packet with the
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* same PID. The continuity_counter wraps around to 0 after its maximum value. The continuity_counter shall not be
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*incremented when the adaptation_field_control of the packet equals '00' or '10'.
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* incremented when the adaptation_field_control of the packet equals '00'(reseverd) or '10'(adaptation field only).
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*
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* In Transport Streams, duplicate packets may be sent as two, and only two, consecutive Transport Stream packets of the
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* same PID. The duplicate packets shall have the same continuity_counter value as the original packet and the
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@ -222,7 +258,9 @@ private:
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SrsTsAdaptationField* adaptation_field;
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SrsTsPayload* payload;
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public:
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SrsTsPacket();
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SrsTsContext* context;
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public:
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SrsTsPacket(SrsTsContext* c);
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virtual ~SrsTsPacket();
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public:
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virtual int decode(SrsStream* stream);
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@ -560,34 +598,6 @@ enum SrsTsPsiId
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SrsTsPsiIdForbidden = 0xFF,
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};
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/**
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* the program of PAT of PSI ts packet.
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*/
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class SrsTsPayloadPATProgram
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{
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public:
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// 4B
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/**
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* Program_number is a 16-bit field. It specifies the program to which the program_map_PID is
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* applicable. When set to 0x0000, then the following PID reference shall be the network PID. For all other cases the value
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* of this field is user defined. This field shall not take any single value more than once within one version of the Program
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* Association Table.
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*/
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int16_t number; // 16bits
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// reserved 3bits
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/**
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* program_map_PID/network_PID 13bits
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* network_PID ¨C The network_PID is a 13-bit field, which is used only in conjunction with the value of the
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* program_number set to 0x0000, specifies the PID of the Transport Stream packets which shall contain the Network
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* Information Table. The value of the network_PID field is defined by the user, but shall only take values as specified in
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* Table 2-3. The presence of the network_PID is optional.
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*/
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int16_t pid;
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public:
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SrsTsPayloadPATProgram();
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virtual ~SrsTsPayloadPATProgram();
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};
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/**
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* the payload of ts packet, can be PES or PSI payload.
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*/
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@ -620,22 +630,6 @@ public:
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* payload of that packet.
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*/
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int8_t pointer_field;
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public:
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SrsTsPayloadPSI(SrsTsPacket* p);
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virtual ~SrsTsPayloadPSI();
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public:
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virtual int decode(SrsStream* stream);
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};
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/**
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* the PAT payload of PSI ts packet.
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* 2.4.4.3 Program association Table, hls-mpeg-ts-iso13818-1.pdf, page 61
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* The Program Association Table provides the correspondence between a program_number and the PID value of the
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* Transport Stream packets which carry the program definition. The program_number is the numeric label associated with
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* a program.
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*/
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class SrsTsPayloadPAT : public SrsTsPayloadPSI
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{
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public:
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// 1B
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/**
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@ -659,7 +653,61 @@ public:
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* field shall not exceed 1021 (0x3FD).
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*/
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u_int16_t section_length; //12bits
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public:
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// 4B
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/**
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* This is a 32-bit field that contains the CRC value that gives a zero output of the registers in the decoder
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* defined in Annex A after processing the entire section.
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* @remark crc32(bytes without pointer field, before crc32 field)
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*/
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int32_t CRC_32; //32bits
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public:
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SrsTsPayloadPSI(SrsTsPacket* p);
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virtual ~SrsTsPayloadPSI();
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public:
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virtual int decode(SrsStream* stream);
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protected:
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virtual int psi_decode(SrsStream* stream) = 0;
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};
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/**
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* the program of PAT of PSI ts packet.
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*/
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class SrsTsPayloadPATProgram
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{
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public:
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// 4B
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/**
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* Program_number is a 16-bit field. It specifies the program to which the program_map_PID is
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* applicable. When set to 0x0000, then the following PID reference shall be the network PID. For all other cases the value
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* of this field is user defined. This field shall not take any single value more than once within one version of the Program
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* Association Table.
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*/
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int16_t number; // 16bits
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// reserved 3bits
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/**
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* program_map_PID/network_PID 13bits
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* network_PID ¨C The network_PID is a 13-bit field, which is used only in conjunction with the value of the
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* program_number set to 0x0000, specifies the PID of the Transport Stream packets which shall contain the Network
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* Information Table. The value of the network_PID field is defined by the user, but shall only take values as specified in
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* Table 2-3. The presence of the network_PID is optional.
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*/
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int16_t pid;
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public:
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SrsTsPayloadPATProgram();
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virtual ~SrsTsPayloadPATProgram();
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};
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/**
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* the PAT payload of PSI ts packet.
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* 2.4.4.3 Program association Table, hls-mpeg-ts-iso13818-1.pdf, page 61
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* The Program Association Table provides the correspondence between a program_number and the PID value of the
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* Transport Stream packets which carry the program definition. The program_number is the numeric label associated with
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* a program.
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*/
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class SrsTsPayloadPAT : public SrsTsPayloadPSI
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{
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public:
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// 2B
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/**
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* This is a 16-bit field which serves as a label to identify this Transport Stream from any other
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@ -700,16 +748,128 @@ public:
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u_int8_t last_section_number; //8bits
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// multiple 4B program data.
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int nb_programs;
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SrsTsPayloadPATProgram* programs;
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// 4B
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int32_t CRC_32; //32bits
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std::vector<SrsTsPayloadPATProgram*> programs;
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public:
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SrsTsPayloadPAT(SrsTsPacket* p);
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virtual ~SrsTsPayloadPAT();
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public:
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virtual int decode(SrsStream* stream);
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virtual int psi_decode(SrsStream* stream);
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};
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/**
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* the esinfo for PMT program.
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*/
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class SrsTsPayloadPMTESInfo
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{
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public:
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// 1B
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/**
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* This is an 8-bit field specifying the type of program element carried within the packets with the PID
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* whose value is specified by the elementary_PID. The values of stream_type are specified in Table 2-29.
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*/
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u_int8_t stream_type; //8bits
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// 2B
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// 3bits reserved
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/**
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* This is a 13-bit field specifying the PID of the Transport Stream packets which carry the associated
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* program element.
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*/
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int16_t elementary_PID; //13bits
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// 2B
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// 4bits reserved
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/**
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* This is a 12-bit field, the first two bits of which shall be '00'. The remaining 10 bits specify the number
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* of bytes of the descriptors of the associated program element immediately following the ES_info_length field.
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*/
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int16_t ES_info_length; //12bits
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char* ES_info; //[ES_info_length] bytes.
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public:
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SrsTsPayloadPMTESInfo();
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virtual ~SrsTsPayloadPMTESInfo();
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};
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/**
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* the PMT payload of PSI ts packet.
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* 2.4.4.8 Program Map Table, hls-mpeg-ts-iso13818-1.pdf, page 64
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* The Program Map Table provides the mappings between program numbers and the program elements that comprise
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* them. A single instance of such a mapping is referred to as a "program definition". The program map table is the
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* complete collection of all program definitions for a Transport Stream. This table shall be transmitted in packets, the PID
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* values of which are selected by the encoder. More than one PID value may be used, if desired. The table is contained in
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* one or more sections with the following syntax. It may be segmented to occupy multiple sections. In each section, the
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* section number field shall be set to zero. Sections are identified by the program_number field.
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*/
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class SrsTsPayloadPMT : public SrsTsPayloadPSI
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{
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public:
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// 2B
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/**
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* program_number is a 16-bit field. It specifies the program to which the program_map_PID is
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* applicable. One program definition shall be carried within only one TS_program_map_section. This implies that a
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* program definition is never longer than 1016 (0x3F8). See Informative Annex C for ways to deal with the cases when
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* that length is not sufficient. The program_number may be used as a designation for a broadcast channel, for example. By
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* describing the different program elements belonging to a program, data from different sources (e.g. sequential events)
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* can be concatenated together to form a continuous set of streams using a program_number. For examples of applications
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* refer to Annex C.
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*/
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u_int16_t program_number; //16bits
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// 1B
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// 2bits reerverd.
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/**
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* This 5-bit field is the version number of the TS_program_map_section. The version number shall be
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* incremented by 1 modulo 32 when a change in the information carried within the section occurs. Version number refers
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* to the definition of a single program, and therefore to a single section. When the current_next_indicator is set to '1', then
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* the version_number shall be that of the currently applicable TS_program_map_section. When the current_next_indicator
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* is set to '0', then the version_number shall be that of the next applicable TS_program_map_section.
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*/
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int8_t version_number; //5bits
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/**
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* A 1-bit field, which when set to '1' indicates that the TS_program_map_section sent is
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* currently applicable. When the bit is set to '0', it indicates that the TS_program_map_section sent is not yet applicable
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* and shall be the next TS_program_map_section to become valid.
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*/
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int8_t current_next_indicator; //1bit
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// 1B
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/**
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* The value of this 8-bit field shall be 0x00.
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*/
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u_int8_t section_number; //8bits
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// 1B
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/**
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* The value of this 8-bit field shall be 0x00.
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*/
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u_int8_t last_section_number; //8bits
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// 2B
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// 2bits reserved.
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/**
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* This is a 13-bit field indicating the PID of the Transport Stream packets which shall contain the PCR fields
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* valid for the program specified by program_number. If no PCR is associated with a program definition for private
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* streams, then this field shall take the value of 0x1FFF. Refer to the semantic definition of PCR in 2.4.3.5 and Table 2-3
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* for restrictions on the choice of PCR_PID value.
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*/
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int16_t PCR_PID; //16bits
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// 2B
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// 4bits reserved.
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/**
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* This is a 12-bit field, the first two bits of which shall be '00'. The remaining 10 bits specify the
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* number of bytes of the descriptors immediately following the program_info_length field.
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*/
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u_int16_t program_info_length; //12bits
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char* program_info_desc; //[program_info_length]bytes
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// array of TSPMTESInfo.
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std::vector<SrsTsPayloadPMTESInfo*> infos;
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public:
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SrsTsPayloadPMT(SrsTsPacket* p);
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virtual ~SrsTsPayloadPMT();
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public:
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virtual int psi_decode(SrsStream* stream);
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};
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/**
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