(r io.Reader)
| 101 | } |
| 102 | |
| 103 | func ReadPAT(r io.Reader) (pat MpegTsPAT, err error) { |
| 104 | lr, psi, err := ReadPSI(r, PSI_TYPE_PAT) |
| 105 | if err != nil { |
| 106 | return |
| 107 | } |
| 108 | |
| 109 | pat = psi.Pat |
| 110 | |
| 111 | // N Loop |
| 112 | // 一直循环去读4个字节,用lr的原因是确保不会读过头了. |
| 113 | for lr.N > 0 { |
| 114 | |
| 115 | // 获取每一个频道的节目信息,保存起来 |
| 116 | programs := MpegTsPATProgram{} |
| 117 | |
| 118 | programs.ProgramNumber, err = util.ReadByteToUint16(lr, true) |
| 119 | if err != nil { |
| 120 | return |
| 121 | } |
| 122 | |
| 123 | // 如果programNumber为0,则是NetworkPID,否则是ProgramMapPID(13) |
| 124 | if programs.ProgramNumber == 0 { |
| 125 | programs.NetworkPID, err = util.ReadByteToUint16(lr, true) |
| 126 | if err != nil { |
| 127 | return |
| 128 | } |
| 129 | |
| 130 | programs.NetworkPID = programs.NetworkPID & 0x1fff |
| 131 | } else { |
| 132 | programs.ProgramMapPID, err = util.ReadByteToUint16(lr, true) |
| 133 | if err != nil { |
| 134 | return |
| 135 | } |
| 136 | |
| 137 | programs.ProgramMapPID = programs.ProgramMapPID & 0x1fff |
| 138 | } |
| 139 | |
| 140 | pat.Program = append(pat.Program, programs) |
| 141 | } |
| 142 | if cr, ok := r.(*util.Crc32Reader); ok { |
| 143 | err = cr.ReadCrc32UIntAndCheck() |
| 144 | if err != nil { |
| 145 | return |
| 146 | } |
| 147 | } |
| 148 | |
| 149 | return |
| 150 | } |
| 151 | |
| 152 | func WritePAT(w io.Writer, pat MpegTsPAT) (err error) { |
| 153 | bw := &bytes.Buffer{} |
no test coverage detected