for #250, decode the PMT and PAT

trunk/src/kernel/srs_kernel_error.hpp

@@ -223,6 +223,9 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define ERROR_STREAM_CASTER_TS_SYNC_BYTE    4013
 #define ERROR_STREAM_CASTER_TS_AF           4014
 #define ERROR_STREAM_CASTER_TS_CRC32        4015
+#define ERROR_STREAM_CASTER_TS_PSI          4016
+#define ERROR_STREAM_CASTER_TS_PAT          4017
+#define ERROR_STREAM_CASTER_TS_PMT          4018
 
 /**
 * whether the error code is an system control error.

trunk/src/kernel/srs_kernel_ts.cpp

@@ -417,7 +417,7 @@ int SrsTsContext::decode(SrsStream* stream)
     // parse util EOF of stream.
     // for example, parse multiple times for the PES_packet_length(0) packet.
     while (!stream->empty()) {
-        SrsTsPacket* packet = new SrsTsPacket();
+        SrsTsPacket* packet = new SrsTsPacket(this);
         SrsAutoFree(SrsTsPacket, packet);
 
         if ((ret = packet->decode(stream)) != ERROR_SUCCESS) {
@@ -429,8 +429,23 @@ int SrsTsContext::decode(SrsStream* stream)
     return ret;
 }
 
-SrsTsPacket::SrsTsPacket()
+SrsTsPidApply SrsTsContext::get(int pid)
 {
+    if (pids.find(pid) == pids.end()) {
+        return SrsTsPidApplyReserved;
+    }
+    return pids[pid];
+}
+
+void SrsTsContext::set(int pid, SrsTsPidApply apply_pid)
+{
+    pids[pid] = apply_pid;
+}
+
+SrsTsPacket::SrsTsPacket(SrsTsContext* c)
+{
+    context = c;
+
     sync_byte = 0;
     transport_error_indicator = 0;
     payload_unit_start_indicator = 0;
@@ -508,8 +523,15 @@ int SrsTsPacket::decode(SrsStream* stream)
             srs_freep(payload);
             payload = new SrsTsPayloadPAT(this);
         } else {
-            // left bytes as reserved.
-            stream->skip(nb_payload);
+            SrsTsPidApply apply_pid = context->get(pid);
+            if (apply_pid == SrsTsPidApplyPMT) {
+                // 2.4.4.8 Program Map Table
+                srs_freep(payload);
+                payload = new SrsTsPayloadPMT(this);
+            } else {
+                // left bytes as reserved.
+                stream->skip(nb_payload);
+            }
         }
 
         if (payload && (ret = payload->decode(stream)) != ERROR_SUCCESS) {
@@ -676,14 +698,16 @@ int SrsTsAdaptationField::decode(SrsStream* stream)
         }
         transport_private_data_length = (u_int8_t)stream->read_1bytes();
 
-        if (!stream->require(transport_private_data_length)) {
-            ret = ERROR_STREAM_CASTER_TS_AF;
-            srs_error("ts: demux af transport_private_data_flag failed. ret=%d", ret);
-            return ret;
+        if (transport_private_data_length> 0) {
+            if (!stream->require(transport_private_data_length)) {
+                ret = ERROR_STREAM_CASTER_TS_AF;
+                srs_error("ts: demux af transport_private_data_flag failed. ret=%d", ret);
+                return ret;
+            }
+            srs_freep(transport_private_data);
+            transport_private_data = new char[transport_private_data_length];
+            stream->read_bytes(transport_private_data, transport_private_data_length);
         }
-        srs_freep(transport_private_data);
-        transport_private_data = new char[transport_private_data_length];
-        stream->read_bytes(transport_private_data, transport_private_data_length);
     }
     
     if (adaptation_field_extension_flag) {
@@ -760,16 +784,6 @@ int SrsTsAdaptationField::decode(SrsStream* stream)
     return ret;
 }
 
-SrsTsPayloadPATProgram::SrsTsPayloadPATProgram()
-{
-    number = 0;
-    pid = 0;
-}
-
-SrsTsPayloadPATProgram::~SrsTsPayloadPATProgram()
-{
-}
-
 SrsTsPayload::SrsTsPayload(SrsTsPacket* p)
 {
     packet = p;
@@ -782,6 +796,7 @@ SrsTsPayload::~SrsTsPayload()
 SrsTsPayloadPSI::SrsTsPayloadPSI(SrsTsPacket* p) : SrsTsPayload(p)
 {
     pointer_field = 0;
+    CRC_32 = 0;
 }
 
 SrsTsPayloadPSI::~SrsTsPayloadPSI()
@@ -802,43 +817,21 @@ int SrsTsPayloadPSI::decode(SrsStream* stream)
     */
     if (packet->payload_unit_start_indicator) {
         if (!stream->require(1)) {
-            ret = ERROR_STREAM_CASTER_TS_AF;
+            ret = ERROR_STREAM_CASTER_TS_PSI;
             srs_error("ts: demux PSI failed. ret=%d", ret);
             return ret;
         }
         pointer_field = stream->read_1bytes();
     }
 
-    return ret;
-}
-
-SrsTsPayloadPAT::SrsTsPayloadPAT(SrsTsPacket* p) : SrsTsPayloadPSI(p)
-{
-    nb_programs = 0;
-    programs = NULL;
-}
-
-SrsTsPayloadPAT::~SrsTsPayloadPAT()
-{
-    srs_freep(programs);
-}
-
-int SrsTsPayloadPAT::decode(SrsStream* stream)
-{
-    int ret = ERROR_SUCCESS;
-
-    if ((ret = SrsTsPayloadPSI::decode(stream)) != ERROR_SUCCESS) {
-        return ret;
-    }
-
     // to calc the crc32
     char* ppat = stream->data() + stream->pos();
     int pat_pos = stream->pos();
 
-    // atleast 8B without programs and crc32
-    if (!stream->require(8)) {
-        ret = ERROR_STREAM_CASTER_TS_AF;
-        srs_error("ts: demux PAT failed. ret=%d", ret);
+    // atleast 3B for all psi.
+    if (!stream->require(3)) {
+        ret = ERROR_STREAM_CASTER_TS_PSI;
+        srs_error("ts: demux PSI failed. ret=%d", ret);
         return ret;
     }
     // 1B
@@ -851,11 +844,82 @@ int SrsTsPayloadPAT::decode(SrsStream* stream)
     const0_value = (section_length >> 14) & 0x01;
     section_length &= 0x0FFF;
 
+    // no section, ignore.
+    if (section_length == 0) {
+        srs_warn("ts: demux PAT ignore empty section");
+        return ret;
+    }
+
     if (!stream->require(section_length)) {
-        ret = ERROR_STREAM_CASTER_TS_AF;
+        ret = ERROR_STREAM_CASTER_TS_PSI;
         srs_error("ts: demux PAT section failed. ret=%d", ret);
         return ret;
     }
+
+    // call the virtual method of actual PSI.
+    if ((ret = psi_decode(stream)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    // 4B
+    if (!stream->require(4)) {
+        ret = ERROR_STREAM_CASTER_TS_PSI;
+        srs_error("ts: demux PSI crc32 failed. ret=%d", ret);
+        return ret;
+    }
+    CRC_32 = stream->read_4bytes();
+
+    // verify crc32.
+    int32_t crc32 = srs_crc32(ppat, stream->pos() - pat_pos - 4);
+    if (crc32 != CRC_32) {
+        ret = ERROR_STREAM_CASTER_TS_CRC32;
+        srs_error("ts: verify PSI crc32 failed. ret=%d", ret);
+        return ret;
+    }
+
+    // consume left stuffings
+    if (!stream->empty()) {
+        stream->skip(stream->size() - stream->pos());
+    }
+
+    return ret;
+}
+
+SrsTsPayloadPATProgram::SrsTsPayloadPATProgram()
+{
+    number = 0;
+    pid = 0;
+}
+
+SrsTsPayloadPATProgram::~SrsTsPayloadPATProgram()
+{
+}
+
+SrsTsPayloadPAT::SrsTsPayloadPAT(SrsTsPacket* p) : SrsTsPayloadPSI(p)
+{
+}
+
+SrsTsPayloadPAT::~SrsTsPayloadPAT()
+{
+    std::vector<SrsTsPayloadPATProgram*>::iterator it;
+    for (it = programs.begin(); it != programs.end(); ++it) {
+        SrsTsPayloadPATProgram* program = *it;
+        srs_freep(program);
+    }
+    programs.clear();
+}
+
+int SrsTsPayloadPAT::psi_decode(SrsStream* stream)
+{
+    int ret = ERROR_SUCCESS;
+
+    // atleast 5B for PAT specified
+    if (!stream->require(5)) {
+        ret = ERROR_STREAM_CASTER_TS_PAT;
+        srs_error("ts: demux PAT failed. ret=%d", ret);
+        return ret;
+    }
+
     int pos = stream->pos();
 
     // 2B
@@ -876,36 +940,137 @@ int SrsTsPayloadPAT::decode(SrsStream* stream)
 
     // multiple 4B program data.
     int program_bytes = section_length - 4 - (stream->pos() - pos);
-    nb_programs = program_bytes / 4;
-    if (nb_programs > 0) {
-        srs_freep(programs);
-        programs = new SrsTsPayloadPATProgram[nb_programs];
+    for (int i = 0; i < program_bytes; i += 4) {
+        SrsTsPayloadPATProgram* program = new SrsTsPayloadPATProgram();
 
-        for (int i = 0; i < nb_programs; i++) {
-            SrsTsPayloadPATProgram* program = programs + i;
+        int tmpv = stream->read_4bytes();
+        program->number = (int16_t)((tmpv >> 16) & 0xFFFF);
+        program->pid = (int16_t)(tmpv & 0x1FFF);
 
-            int tmpv = stream->read_4bytes();
-            program->number = (int16_t)((tmpv >> 16) & 0xFFFF);
-            program->pid = (int16_t)(tmpv & 0x1FFF);
-        }
+        // update the apply pid table.
+        packet->context->set(program->pid, SrsTsPidApplyPMT);
+
+        programs.push_back(program);
     }
-    
-    // 4B
-    if (!stream->require(4)) {
-        ret = ERROR_STREAM_CASTER_TS_AF;
-        srs_error("ts: demux PAT crc32 failed. ret=%d", ret);
-        return ret;
+
+    // update the apply pid table.
+    packet->context->set(packet->pid, SrsTsPidApplyPAT);
+
+    return ret;
+}
+
+SrsTsPayloadPMTESInfo::SrsTsPayloadPMTESInfo()
+{
+    ES_info_length = 0;
+    ES_info = NULL;
+}
+
+SrsTsPayloadPMTESInfo::~SrsTsPayloadPMTESInfo()
+{
+    srs_freep(ES_info);
+}
+
+SrsTsPayloadPMT::SrsTsPayloadPMT(SrsTsPacket* p) : SrsTsPayloadPSI(p)
+{
+    program_info_length = 0;
+    program_info_desc = NULL;
+}
+
+SrsTsPayloadPMT::~SrsTsPayloadPMT()
+{
+    srs_freep(program_info_desc);
+
+    std::vector<SrsTsPayloadPMTESInfo*>::iterator it;
+    for (it = infos.begin(); it != infos.end(); ++it) {
+        SrsTsPayloadPMTESInfo* info = *it;
+        srs_freep(info);
     }
-    CRC_32 = stream->read_4bytes();
+    infos.clear();
+}
 
-    // verify crc32.
-    int32_t crc32 = srs_crc32(ppat, stream->pos() - pat_pos - 4);
-    if (crc32 != CRC_32) {
-        ret = ERROR_STREAM_CASTER_TS_CRC32;
-        srs_error("ts: verify PAT crc32 failed. ret=%d", ret);
+int SrsTsPayloadPMT::psi_decode(SrsStream* stream)
+{
+    int ret = ERROR_SUCCESS;
+
+    // atleast 9B for PMT specified
+    if (!stream->require(9)) {
+        ret = ERROR_STREAM_CASTER_TS_PMT;
+        srs_error("ts: demux PMT failed. ret=%d", ret);
         return ret;
     }
 
+    // 2B
+    program_number = stream->read_2bytes();
+    
+    // 1B
+    current_next_indicator = stream->read_1bytes();
+    
+    version_number = (current_next_indicator >> 1) & 0x1F;
+    current_next_indicator &= 0x01;
+    
+    // 1B
+    section_number = stream->read_1bytes();
+    
+    // 1B
+    last_section_number = stream->read_1bytes();
+
+    // 2B
+    PCR_PID = stream->read_2bytes();
+    
+    PCR_PID &= 0x1FFF;
+    
+    // 2B
+    program_info_length = stream->read_2bytes();
+
+    program_info_length &= 0xFFF;
+    
+    if (program_info_length > 0) {
+        if (!stream->require(program_info_length)) {
+            ret = ERROR_STREAM_CASTER_TS_PMT;
+            srs_error("ts: demux PMT program info failed. ret=%d", ret);
+            return ret;
+        }
+
+        srs_freep(program_info_desc);
+        program_info_desc = new char[program_info_length];
+        stream->read_bytes(program_info_desc, program_info_length);
+    }
+
+    // [section_length] - 4(CRC) - 9B - [program_info_length]
+    int ES_EOF_pos = stream->pos() + section_length - 4 - 9 - program_info_length;
+    while (stream->pos() < ES_EOF_pos) {
+        SrsTsPayloadPMTESInfo* info = new SrsTsPayloadPMTESInfo();
+        infos.push_back(info);
+
+        // 5B
+        if (!stream->require(5)) {
+            ret = ERROR_STREAM_CASTER_TS_PMT;
+            srs_error("ts: demux PMT es info failed. ret=%d", ret);
+            return ret;
+        }
+
+        info->stream_type = stream->read_1bytes();
+        info->elementary_PID = stream->read_2bytes();
+        info->ES_info_length = stream->read_2bytes();
+
+        info->elementary_PID &= 0x1FFF;
+        info->ES_info_length &= 0x0FFF;
+
+        if (info->ES_info_length > 0) {
+            if (!stream->require(info->ES_info_length)) {
+                ret = ERROR_STREAM_CASTER_TS_PMT;
+                srs_error("ts: demux PMT es info data failed. ret=%d", ret);
+                return ret;
+            }
+            srs_freep(info->ES_info);
+            info->ES_info = new char[info->ES_info_length];
+            stream->read_bytes(info->ES_info, info->ES_info_length);
+        }
+    }
+
+    // update the apply pid table.
+    packet->context->set(packet->pid, SrsTsPidApplyPMT);
+
     return ret;
 }
 

trunk/src/kernel/srs_kernel_ts.hpp

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