mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-15 16:06:41 +03:00
Aidan Ridley
97ba4dfd7b
Added check for empty caption packets in closed_caption_parser. Added a unit test that verifies the closed_caption_parser now works with a video segment that contains empty caption packets. Fixes #3608
105 lines
2.6 KiB
JavaScript
105 lines
2.6 KiB
JavaScript
/*! @license
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* Shaka Player
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* Copyright 2016 Google LLC
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* SPDX-License-Identifier: Apache-2.0
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*/
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goog.provide('shaka.media.ClosedCaptionParser');
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goog.provide('shaka.media.IClosedCaptionParser');
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goog.require('shaka.cea.CeaDecoder');
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goog.require('shaka.cea.Mp4CeaParser');
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goog.require('shaka.util.BufferUtils');
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goog.requireType('shaka.cea.ICaptionDecoder');
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goog.requireType('shaka.cea.ICeaParser');
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/**
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* The IClosedCaptionParser defines the interface to provide all operations for
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* parsing the closed captions embedded in Dash videos streams.
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* TODO: Remove this interface and move method definitions
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* directly to ClosedCaptonParser.
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* @interface
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*/
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shaka.media.IClosedCaptionParser = class {
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/**
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* Initialize the caption parser. This should be called only once.
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* @param {BufferSource} initSegment
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*/
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init(initSegment) {}
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/**
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* Parses embedded CEA closed captions and interacts with the underlying
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* CaptionStream, and calls the callback function when there are closed
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* captions.
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*
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* @param {BufferSource} mediaFragment
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* @return {!Array<!shaka.cea.ICaptionDecoder.ClosedCaption>}
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* An array of parsed closed captions.
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*/
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parseFrom(mediaFragment) {}
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/**
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* Resets the CaptionStream.
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*/
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reset() {}
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};
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/**
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* Closed Caption Parser provides all operations for parsing the closed captions
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* embedded in Dash videos streams.
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*
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* @implements {shaka.media.IClosedCaptionParser}
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* @final
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*/
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shaka.media.ClosedCaptionParser = class {
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/** */
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constructor() {
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/**
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* MP4 Parser to extract closed caption packets from H.264 video.
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* @private {!shaka.cea.ICeaParser}
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*/
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this.ceaParser_ = new shaka.cea.Mp4CeaParser();
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/**
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* Decoder for decoding CEA-X08 data from closed caption packets.
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* @private {!shaka.cea.ICaptionDecoder}
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*/
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this.ceaDecoder_ = new shaka.cea.CeaDecoder();
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}
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/**
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* @override
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*/
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init(initSegment) {
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this.ceaParser_.init(initSegment);
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}
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/**
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* @override
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*/
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parseFrom(mediaFragment) {
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// Parse the fragment.
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const captionPackets = this.ceaParser_.parse(mediaFragment);
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// Extract the caption packets for decoding.
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for (const captionPacket of captionPackets) {
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const uint8ArrayData =
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shaka.util.BufferUtils.toUint8(captionPacket.packet);
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if (uint8ArrayData.length > 0) {
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this.ceaDecoder_.extract(uint8ArrayData, captionPacket.pts);
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}
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}
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// Decode and return the parsed captions.
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return this.ceaDecoder_.decode();
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}
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/**
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* @override
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*/
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reset() {
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this.ceaDecoder_.clear();
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}
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};
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