82 lines
3.2 KiB
ActionScript
82 lines
3.2 KiB
ActionScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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package org.mangui.hls.demux {
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import flash.utils.ByteArray;
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/** Representation of a Packetized Elementary Stream. **/
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public class PES {
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/** The PES data (including headers). **/
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public var data : ByteArray;
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/** PES prefix **/
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public var prefix : uint;
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/** Start of the payload. **/
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public var payload : uint;
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/** Timestamp from the PTS header. **/
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public var pts : Number;
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/** Timestamp from the DTS header. **/
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public var dts : Number;
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/** PES packet len **/
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public var len : int;
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/** PES packet len **/
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public var payload_len : int;
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/** Save the first chunk of PES data. **/
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public function PES(dat : ByteArray) {
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data = dat;
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parse();
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};
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/** When all data is appended, parse the PES headers. **/
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private function parse() : void {
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data.position = 0;
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// Start code prefix and packet ID.
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prefix = data.readUnsignedInt();
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// read len
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len = data.readUnsignedShort();
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// Ignore marker bits.
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data.position += 1;
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// Check for PTS
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var flags : uint = (data.readUnsignedByte() & 192) >> 6;
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// Check PES header length
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var length : uint = data.readUnsignedByte();
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if (flags == 2 || flags == 3) {
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// Grab the timestamp from PTS data (spread out over 5 bytes):
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// XXXX---X -------- -------X -------- -------X
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var _pts : Number = Number((data.readUnsignedByte() & 0x0e)) * Number(1 << 29) + Number((data.readUnsignedShort() >> 1) << 15) + Number((data.readUnsignedShort() >> 1));
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// check if greater than 2^32 -1
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if (_pts > 4294967295) {
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// decrement 2^33
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_pts -= 8589934592;
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}
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length -= 5;
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var _dts : Number = _pts;
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if (flags == 3) {
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// Grab the DTS (like PTS)
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_dts = Number((data.readUnsignedByte() & 0x0e)) * Number(1 << 29) + Number((data.readUnsignedShort() >> 1) << 15) + Number((data.readUnsignedShort() >> 1));
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// check if greater than 2^32 -1
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if (_dts > 4294967295) {
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// decrement 2^33
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_dts -= 8589934592;
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}
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length -= 5;
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}
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pts = Math.round(_pts / 90);
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dts = Math.round(_dts / 90);
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// CONFIG::LOGGING {
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// Log.info("pts/dts: " + pts + "/"+ dts);
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// }
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}
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// Skip other header data and parse payload.
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data.position += length;
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payload = data.position;
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if (len) {
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payload_len = len - data.position + 6;
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} else {
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payload_len = 0;
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}
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};
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}
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} |