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111 lines
2.7 KiB
Go
111 lines
2.7 KiB
Go
// Copyright 2020, Chef. All rights reserved.
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// https://github.com/q191201771/lal
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//
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// Use of this source code is governed by a MIT-style license
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// that can be found in the License file.
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//
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// Author: Chef (191201771@qq.com)
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package mpegts
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import (
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"github.com/q191201771/naza/pkg/nazabits"
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"github.com/q191201771/naza/pkg/nazalog"
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)
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// ----------------------------------------
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// Program Map Table
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// <iso13818-1.pdf> <2.4.4.8> <page 64/174>
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// table_id [8b] *
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// section_syntax_indicator [1b]
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// 0 [1b]
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// reserved [2b]
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// section_length [12b] **
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// program_number [16b] **
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// reserved [2b]
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// version_number [5b]
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// current_next_indicator [1b] *
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// section_number [8b] *
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// last_section_number [8b] *
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// reserved [3b]
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// PCR_PID [13b] **
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// reserved [4b]
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// program_info_length [12b] **
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// -----loop-----
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// stream_type [8b] *
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// reserved [3b]
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// elementary_PID [13b] **
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// reserved [4b]
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// ES_info_length_length [12b] **
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// --------------
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// CRC32 [32b] ****
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// ----------------------------------------
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type PMT struct {
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tid uint8
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ssi uint8
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sl uint16
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pn uint16
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vn uint8
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cni uint8
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sn uint8
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lsn uint8
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pp uint16
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pil uint16
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ProgramElements []PMTProgramElement
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crc32 uint32
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}
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type PMTProgramElement struct {
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StreamType uint8
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Pid uint16
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Length uint16
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}
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func ParsePMT(b []byte) (pmt PMT) {
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br := nazabits.NewBitReader(b)
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pmt.tid, _ = br.ReadBits8(8)
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pmt.ssi, _ = br.ReadBits8(1)
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_, _ = br.ReadBits8(3)
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pmt.sl, _ = br.ReadBits16(12)
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len := pmt.sl - 13
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pmt.pn, _ = br.ReadBits16(16)
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_, _ = br.ReadBits8(2)
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pmt.vn, _ = br.ReadBits8(5)
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pmt.cni, _ = br.ReadBits8(1)
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pmt.sn, _ = br.ReadBits8(8)
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pmt.lsn, _ = br.ReadBits8(8)
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_, _ = br.ReadBits8(3)
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pmt.pp, _ = br.ReadBits16(13)
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_, _ = br.ReadBits8(4)
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pmt.pil, _ = br.ReadBits16(12)
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if pmt.pil != 0 {
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nazalog.Warn(pmt.pil)
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_, _ = br.ReadBytes(uint(pmt.pil))
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}
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for i := uint16(0); i < len; i += 5 {
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var ppe PMTProgramElement
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ppe.StreamType, _ = br.ReadBits8(8)
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_, _ = br.ReadBits8(3)
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ppe.Pid, _ = br.ReadBits16(13)
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_, _ = br.ReadBits8(4)
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ppe.Length, _ = br.ReadBits16(12)
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if ppe.Length != 0 {
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nazalog.Warn(ppe.Length)
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_, _ = br.ReadBits32(uint(ppe.Length))
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}
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pmt.ProgramElements = append(pmt.ProgramElements, ppe)
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}
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return
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}
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func (pmt *PMT) SearchPID(pid uint16) *PMTProgramElement {
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for _, ppe := range pmt.ProgramElements {
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if ppe.Pid == pid {
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return &ppe
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}
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}
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return nil
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}
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