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@ -28,6 +28,7 @@ class SrsTsPayload;
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class SrsTsMessage;
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class SrsTsPacket;
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class SrsTsContext;
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class SrsPsPacket;
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// Transport Stream packets are 188 bytes in length.
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#define SRS_TS_PACKET_SIZE 188
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@ -90,14 +91,14 @@ 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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SrsTsPidApplyPAT, // Program associtate table for TS.
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SrsTsPidApplyPMT, // Program map table for TS.
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SrsTsPidApplyVideo, // for video
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SrsTsPidApplyAudio, // vor audio
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};
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// Table 2-29 - Stream type assignments
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// Table 2-29 - Stream type assignments, hls-mpeg-ts-iso13818-1.pdf, page 66
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enum SrsTsStream
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{
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// ITU-T | ISO/IEC Reserved
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@ -215,9 +216,7 @@ enum SrsTsPESStreamId
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class SrsTsMessage
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{
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public:
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// For decoder only,
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// the ts messgae does not use them,
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// for user to get the channel and packet.
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// For decoder only, the ts message does not use them, for user to get the channel and packet.
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SrsTsChannel* channel;
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SrsTsPacket* packet;
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public:
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@ -294,12 +293,10 @@ private:
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// When PAT and PMT writen, the context is ready.
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// @see https://github.com/ossrs/srs/issues/834
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bool ready;
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// codec
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private:
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std::map<int, SrsTsChannel*> pids;
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bool pure_audio;
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int8_t sync_byte;
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// encoder
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private:
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// when any codec changed, write the PAT/PMT.
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SrsVideoCodecId vcodec;
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@ -309,37 +306,33 @@ public:
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virtual ~SrsTsContext();
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public:
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// Whether the hls stream is pure audio stream.
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// TODO: FIXME: merge with muxer codec detect.
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// TODO: FIXME: merge with muxer codec detect.
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virtual bool is_pure_audio();
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// When PMT table parsed, we know some info about stream.
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virtual void on_pmt_parsed();
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// Reset the context for a new ts segment start.
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virtual void reset();
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// codec
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public:
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// Get the pid apply, the parsed pid.
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// @return the apply channel; NULL for invalid.
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virtual SrsTsChannel* get(int pid);
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// Set the pid apply, the parsed pid.
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virtual void set(int pid, SrsTsPidApply apply_pid, SrsTsStream stream = SrsTsStreamReserved);
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// decode methods
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public:
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// The stream contains only one ts packet.
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// @param handler the ts message handler to process the msg.
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// @remark we will consume all bytes in stream.
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// Feed with ts packets, decode as ts message, callback handler if got one ts message.
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// A ts video message can be decoded to NALUs by SrsRawH264Stream::annexb_demux.
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// A ts audio message can be decoded to RAW frame by SrsRawAacStream::adts_demux.
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// @param handler The ts message handler to process the msg.
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// @remark We will consume all bytes in stream.
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virtual srs_error_t decode(SrsBuffer* stream, ISrsTsHandler* handler);
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// encode methods
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public:
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// Write the PES packet, the video/audio stream.
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// @param msg the video/audio msg to write to ts.
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// @param vc the video codec, write the PAT/PMT table when changed.
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// @param ac the audio codec, write the PAT/PMT table when changed.
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// Encode ts video/audio messages to the PES packets, as PES stream.
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// @param msg The video/audio msg to write to ts.
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// A ts video message is a frame with one or more NALUs, generally encoded by SrsTsMessageCache.cache_video.
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// A ts audio message is an audio packet, encoded by SrsTsMessageCache.cache_audio to ADTS for AAC.
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// @param vc The video codec, write the PAT/PMT table when changed.
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// @param ac The audio codec, write the PAT/PMT table when changed.
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virtual srs_error_t encode(ISrsStreamWriter* writer, SrsTsMessage* msg, SrsVideoCodecId vc, SrsAudioCodecId ac);
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// drm methods
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public:
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// Set sync byte of ts segment.
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// replace the standard ts sync byte to bravo sync byte.
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virtual void set_sync_byte(int8_t sb);
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private:
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virtual srs_error_t encode_pat_pmt(ISrsStreamWriter* writer, int16_t vpid, SrsTsStream vs, int16_t apid, SrsTsStream as);
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virtual srs_error_t encode_pes(ISrsStreamWriter* writer, SrsTsMessage* msg, int16_t pid, SrsTsStream sid, bool pure_audio);
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@ -741,9 +734,8 @@ public:
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virtual srs_error_t encode(SrsBuffer* stream) = 0;
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};
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// The PES payload of ts packet.
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// 2.4.3.6 PES packet, hls-mpeg-ts-iso13818-1.pdf, page 49
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class SrsTsPayloadPES : public SrsTsPayload
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// Common MPEG PES packet for both TS and PS.
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class SrsMpegPES
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{
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public:
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// 3B
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@ -763,7 +755,7 @@ public:
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// field. A value of 0 indicates that the PES packet length is neither specified nor bounded and is allowed only in
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// PES packets whose payload consists of bytes from a video elementary stream contained in Transport Stream packets.
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uint16_t PES_packet_length; //16bits
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// 1B
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// 2bits const '10'
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int8_t const2bits; //2bits
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@ -790,7 +782,7 @@ public:
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// This is a 1-bit field. When set to '1' the contents of the associated PES packet payload is an original.
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// When set to '0' it indicates that the contents of the associated PES packet payload is a copy.
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int8_t original_or_copy; //1bit
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// 1B
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// This is a 2-bit field. When the PTS_DTS_flags field is set to '10', the PTS fields shall be present in
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// the PES packet header. When the PTS_DTS_flags field is set to '11', both the PTS fields and DTS fields shall be present
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@ -815,13 +807,13 @@ public:
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// A 1-bit flag, which when set to '1' indicates that an extension field exists in this PES packet
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// header. When set to '0' it indicates that this field is not present.
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int8_t PES_extension_flag; //1bit
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// 1B
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// An 8-bit field specifying the total number of bytes occupied by the optional fields and any
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// stuffing bytes contained in this PES packet header. The presence of optional fields is indicated in the byte that precedes
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// the PES_header_data_length field.
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uint8_t PES_header_data_length; //8bits
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// 5B
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// Presentation times shall be related to decoding times as follows: The PTS is a 33-bit
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// number coded in three separate fields. It indicates the time of presentation, tp n (k), in the system target decoder of a
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@ -839,7 +831,7 @@ public:
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// 15bits PTS [14..0]
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// 1bit const '1'
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int64_t pts; // 33bits
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// 5B
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// The DTS is a 33-bit number coded in three separate fields. It indicates the decoding time,
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// td n (j), in the system target decoder of an access unit j of elementary stream n. The value of DTS is specified in units of
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@ -855,7 +847,7 @@ public:
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// 15bits DTS [14..0]
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// 1bit const '1'
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int64_t dts; // 33bits
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// 6B
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// The elementary stream clock reference is a 42-bit field coded in two parts. The first
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// part, ESCR_base, is a 33-bit field whose value is given by ESCR_base(i), as given in equation 2-14. The second part,
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@ -873,7 +865,7 @@ public:
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// 1bit const '1'
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int64_t ESCR_base; //33bits
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int16_t ESCR_extension; //9bits
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// 3B
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// The ES_rate field is a 22-bit unsigned integer specifying the rate at which the
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// system target decoder receives bytes of the PES packet in the case of a PES stream. The ES_rate is valid in the PES
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@ -885,24 +877,24 @@ public:
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// 22bits ES_rate
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// 1bit const '1'
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int32_t ES_rate; //22bits
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// 1B
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// A 3-bit field that indicates which trick mode is applied to the associated video stream. In cases of
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// other types of elementary streams, the meanings of this field and those defined by the following five bits are undefined.
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// For the definition of trick_mode status, refer to the trick mode section of 2.4.2.3.
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int8_t trick_mode_control; //3bits
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int8_t trick_mode_value; //5bits
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// 1B
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// 1bit const '1'
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// This 7-bit field contains private data relating to copyright information.
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int8_t additional_copy_info; //7bits
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// 2B
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// The previous_PES_packet_CRC is a 16-bit field that contains the CRC value that yields
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// a zero output of the 16 registers in the decoder similar to the one defined in Annex A,
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int16_t previous_PES_packet_CRC; //16bits
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// 1B
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// A 1-bit flag which when set to '1' indicates that the PES packet header contains private data.
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// When set to a value of '0' it indicates that private data is not present in the PES header.
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@ -926,15 +918,15 @@ public:
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// field and associated fields. When set to a value of '0' this indicates that the PES_extension_field_length field and any
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// associated fields are not present.
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int8_t PES_extension_flag_2; //1bit
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// 16B
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// This is a 16-byte field which contains private data. This data, combined with the fields before and
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// after, shall not emulate the packet_start_code_prefix (0x000001).
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std::vector<char> PES_private_data; //128bits
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// (1+x)B
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std::vector<char> pack_field; //[pack_field_length] bytes
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// 2B
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// 1bit const '1'
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// The program_packet_sequence_counter field is a 7-bit field. It is an optional
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@ -952,7 +944,7 @@ public:
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// This 6-bit field specifies the number of stuffing bytes used in the original ITU-T
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// Rec. H.222.0 | ISO/IEC 13818-1 PES packet header or in the original ISO/IEC 11172-1 packet header.
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int8_t original_stuff_length; //6bits
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// 2B
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// 2bits const '01'
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// The P-STD_buffer_scale is a 1-bit field, the meaning of which is only defined if this PES packet
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@ -966,17 +958,17 @@ public:
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// P-STD_buffer_scale has the value '0', then the P-STD_buffer_size measures the buffer size in units of 128 bytes. If
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// P-STD_buffer_scale has the value '1', then the P-STD_buffer_size measures the buffer size in units of 1024 bytes.
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int16_t P_STD_buffer_size; //13bits
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// (1+x)B
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// 1bit const '1'
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std::vector<char> PES_extension_field; //[PES_extension_field_length] bytes
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// NB
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// This is a fixed 8-bit value equal to '1111 1111' that can be inserted by the encoder, for example to meet
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// the requirements of the channel. It is discarded by the decoder. No more than 32 stuffing bytes shall be present in one
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// PES packet header.
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int nb_stuffings;
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// NB
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// PES_packet_data_bytes shall be contiguous bytes of data from the elementary stream
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// indicated by the packet's stream_id or PID. When the elementary stream data conforms to ITU-T
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@ -989,15 +981,19 @@ public:
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// In the case of a private_stream_1, private_stream_2, ECM_stream, or EMM_stream, the contents of the
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// PES_packet_data_byte field are user definable and will not be specified by ITU-T | ISO/IEC in the future.
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int nb_bytes;
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// NB
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// This is a fixed 8-bit value equal to '1111 1111'. It is discarded by the decoder.
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int nb_paddings;
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public:
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SrsTsPayloadPES(SrsTsPacket* p);
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virtual ~SrsTsPayloadPES();
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// Whether contains payload to dump to message.
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bool has_payload_;
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int nb_payload_;
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public:
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virtual srs_error_t decode(SrsBuffer* stream, SrsTsMessage** ppmsg);
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SrsMpegPES();
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virtual ~SrsMpegPES();
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public:
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virtual srs_error_t decode(SrsBuffer* stream);
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public:
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virtual int size();
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virtual srs_error_t encode(SrsBuffer* stream);
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@ -1006,6 +1002,22 @@ private:
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virtual srs_error_t encode_33bits_dts_pts(SrsBuffer* stream, uint8_t fb, int64_t v);
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};
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// The PES payload of ts packet.
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// 2.4.3.6 PES packet, hls-mpeg-ts-iso13818-1.pdf, page 49
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class SrsTsPayloadPES : public SrsTsPayload
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{
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public:
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SrsMpegPES pes;
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public:
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SrsTsPayloadPES(SrsTsPacket* p);
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virtual ~SrsTsPayloadPES();
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public:
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virtual srs_error_t decode(SrsBuffer* stream, SrsTsMessage** ppmsg);
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public:
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virtual int size();
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virtual srs_error_t encode(SrsBuffer* stream);
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};
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// The PSI payload of ts packet.
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// 2.4.4 Program specific information, hls-mpeg-ts-iso13818-1.pdf, page 59
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class SrsTsPayloadPSI : public SrsTsPayload
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winlin
2 years ago