51161498

Committed 13 Dec 2024 04:24AM UTC coverage: 92.554%. Remained the same

Build # 51161498

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appveyor

Committed by

benrr101

Commit Message

Merge branch 'release/v6.0.1' into develop

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4.88

/src/mpeg4/boxes/appleElementaryStreamDescriptor.ts

import FullBox from "./fullBox";
import Mpeg4BoxHeader from "../mpeg4BoxHeader";
import {ByteVector, StringType} from "../../byteVector";
import {DescriptorTag} from "../descriptorTag";
import {DescriptorTagReader} from "../descriptorTagReader";
import {File} from "../../file";
import {NumberUtils} from "../../utils";

/**
 * This class extends {@link FullBox} to provide an implementation of an Apple
 * ElementaryStreamDescriptor. This box may appear as a child of a {@link IsoAudioSampleEntry} and
 * provided further information about an audio stream.
 */
export default class AppleElementaryStreamDescriptor extends FullBox {
    private _dependsOnEsId: number;
    private _streamDependenceFlag: boolean;
    private _ocrStreamFlag: boolean;
    private _ocrEsId: number;
    private _urlFlag: boolean;
    private _urlLength: number;
    private _urlString: string;
    private _upStream: boolean;
    private _maximumBitrate: number;
    private _averageBitrate: number;
    private _streamId: number;
    private _streamPriority: number;
    private _objectTypeId: number;
    private _streamType: number;
    private _bufferSizeDB: number;
    private _decoderConfig: ByteVector;

    /**
     * Private constructor to force construction via static functions.
     */
    private constructor() {
        super();
    }

    /**
     * Constructs and initializes a new instance of {@link AppleElementaryStreamDescriptor} with a provided
     * header and handler by reading the contents from a specified file.
     * @param header A {@link Mpeg4BoxHeader} object containing the header to use for the new instance.
     * @param file A {@link File} object to read the contents of the box from.
     * @param handlerType Type of the handler box object containing the handler that applies to the
     *     new instance, or undefined if no handler applies.
     */
    public static fromFile(
        header: Mpeg4BoxHeader,
        file: File,
        handlerType: ByteVector
    ): AppleElementaryStreamDescriptor {
        // ES_Descriptor Specifications
        // Section 7.2.6.5 http://ecee.colorado.edu/~ecen5653/ecen5653/papers/ISO%2014496-1%202004.PDF

        const instance = new AppleElementaryStreamDescriptor();
        instance.initializeFromHeaderFileAndHandler(header, file, handlerType);
        const boxData = file.readBlock(instance.dataSize);
        instance._decoderConfig = ByteVector.empty();
        const reader = new DescriptorTagReader(boxData);

        // Elementary Stream Descriptor Tag
        if (boxData.get(reader.increaseOffset(1)) !== DescriptorTag.EsDescriptorTag) {
            throw new Error("Invalid Elementary Stream Descriptor, missing tag.");
        }

        // We have a descriptor tag. Check that the remainder of the tag is at least
        // [
        //   Base (3 bytes) +
        //   DecoderConfigDescriptor (15 bytes) +
        //   SLConfigDescriptor (3 bytes) + OtherDescriptors
        // ] bytes long
        const esLength = reader.readLength();
        let minEsLength = 3 + 15 + 3; // Base minimum length

        if (esLength < minEsLength) {
            throw new Error("Insufficient data present.");
        }

        instance._streamId = boxData.subarray(reader.offset, 2).toUshort();
        reader.increaseOffset(2); // Done with ES_ID

        // 1st bit
        const flagByte = boxData.get(reader.offset);
        instance._streamDependenceFlag = NumberUtils.uintAnd(NumberUtils.uintRShift(flagByte, 7),0x1) === 0x1;

        // 2nd bit
        instance._urlFlag = NumberUtils.uintAnd(NumberUtils.uintRShift(flagByte, 6), 0x1) === 0x1;

        // 3rd bit
        instance._ocrStreamFlag = NumberUtils.uintAnd(NumberUtils.uintRShift(flagByte, 5), 0x1) === 0x1;

        // Last 5 bits and we're done with this byte
        instance._streamPriority = NumberUtils.uintAnd(flagByte, 0x1f);

        reader.increaseOffset(1);

        if (instance._streamDependenceFlag) {
            minEsLength += 2; // We need 2 more bytes

            if (esLength < minEsLength) {
                throw new Error("Insufficient data present.");
            }

            instance._dependsOnEsId = boxData.subarray(reader.offset, 2).toUshort();
            reader.increaseOffset(2); // Done with stream dependence
        }

        if (instance._urlFlag) {
            minEsLength += 2; // We need 1 more byte

            if (esLength < minEsLength) {
                throw new Error("Insufficient data present.");
            }

            instance._urlLength = boxData.get(reader.increaseOffset(1)); // URL Length
            minEsLength += instance._urlLength; // We need URLength more bytes

            if (esLength < minEsLength) {
                throw new Error("Insufficient data present.");
            }

            // URL name
            instance._urlString = boxData.subarray(reader.offset, instance._urlLength).toString(StringType.UTF8);
            reader.increaseOffset(instance._urlLength);
        }

        if (instance._ocrStreamFlag) {
            minEsLength += 2; // We need 2 more bytes

            if (esLength < minEsLength) {
                throw new Error("Insufficient data present.");
            }

            instance._ocrEsId = boxData.subarray(reader.offset, 2).toUshort();
            reader.increaseOffset(2); // Done with OCR
        }

        // Loop through all trailing Descriptors Tags
        while (reader.offset < instance.dataSize) {
            const tag = boxData.get(reader.increaseOffset(1));
            let length: number;
            switch (tag) {
                case DescriptorTag.DecoderConfigDescriptorTag: // DecoderConfigDescriptor
                    /**
                     * Check that the remainder of the tag is at least 13 bytes long
                     * (13 + DecoderSpecificInfo[] + profileLevelIndicationIndexDescriptor[])
                     */
                    if (reader.readLength() < 13) {
                        throw new Error("Could not read data. Too small.");
                    }

                    // Read a lot of good info.
                    instance._objectTypeId = boxData.get(reader.offset);
                    reader.increaseOffset(1);

                    // First 6 bits
                    const streamByte = boxData.get(reader.offset);
                    instance._streamType = NumberUtils.uintRShift(streamByte, 2);

                    // 7th bit and we're done with the stream bits
                    instance._upStream = NumberUtils.uintAnd(NumberUtils.uintRShift(streamByte, 1), 0x1) === 0x1;
                    reader.increaseOffset(1);

                    instance._bufferSizeDB = boxData.subarray(reader.offset, 3).toUint();
                    reader.increaseOffset(3); // Done with bufferSizeDB

                    const maximumBitrate = boxData.subarray(reader.offset, 4).toUint();
                    instance._maximumBitrate = AppleElementaryStreamDescriptor.calculateBitRate(maximumBitrate);
                    reader.increaseOffset(4); // Done with maxBitrate

                    const averageBitrate = boxData.subarray(reader.offset, 4).toUint();
                    instance._averageBitrate = AppleElementaryStreamDescriptor.calculateBitRate(averageBitrate);
                    reader.increaseOffset(4); // Done with avgBitrate

                    // If there's a DecoderSpecificInfo[] array at the end it'll pick it up in the while loop
                    break;

                case DescriptorTag.DecSpecificInfoTag: // DecoderSpecificInfo
                    // The rest of the info is decoder specific.
                    length = reader.readLength();

                    instance._decoderConfig = boxData.subarray(reader.offset, length);
                    reader.increaseOffset(length); // We're done with the config
                    break;

                case DescriptorTag.SlConfigDescriptorTag: // SLConfigDescriptor
                    // The rest of the info is SL specific.
                    length = reader.readLength();

                    // Skip the rest of the descriptor as reported in the length so we can move onto the next one
                    reader.increaseOffset(length);
                    break;

                case DescriptorTag.Forbidden0:
                case DescriptorTag.Forbidden255:
                    throw new Error("Invalid Descriptor tag.");
                default:
                    /**
                     * TODO: Should we handle other optional descriptor tags?
                     * ExtensionDescriptor extDescr[0 .. 255];
                     * LanguageDescriptor langDescr[0 .. 1];
                     * IPI_DescPointer ipiPtr[0 .. 1];
                     * IP_IdentificationDataSet ipIDS[0 .. 1];
                     * QoS_Descriptor qosDescr[0 .. 1];
                     */
                    // Every descriptor starts with a length
                    length = reader.readLength();

                    // Skip the rest of the descriptor as reported in the length so we can move onto the next one
                    reader.increaseOffset(length);

                    break;
            }
        }

        return instance;
    }

    /**
     * Gets the maximum average the stream described by the current instance.
     */
    public get averageBitrate(): number { return this._averageBitrate; }

    /**
     * Gets the buffer size DB value the stream described by the current instance.
     */
    public get bufferSizeDB(): number { return this._bufferSizeDB; }

    /**
     * Gets the decoder config data of stream described by the current instance.
     */
    public get decoderConfig(): ByteVector { return this._decoderConfig; }

    /**
     * Gets the ES_ID of another elementary stream on which this elementary stream depends
     */
    public get dependsOnEsId(): number { return this._dependsOnEsId; }

    /**
     * Gets the maximum bitrate the stream described by the current instance.
     */
    public get maximumBitrate(): number { return this._maximumBitrate; }

    /**
     * Gets the object type ID of the stream described by the current instance.
     */
    public get objectTypeId(): number { return this._objectTypeId; }

    /**
     * Gets the OCR ES_ID
     */
    public get ocrEsId(): number { return this._ocrEsId; }

    /**
     * Gets the OCR Stream Flag
     */
    public get ocrStreamFlag(): boolean { return this._ocrStreamFlag; }

    /**
     * Gets a value indicating that a dependsOn_ES_ID will follow
     */
    public get streamDependenceFlag(): boolean { return this._streamDependenceFlag; }

    /**
     * Gets the ID of the stream described by the current instance.
     */
    public get streamId(): number { return this._streamId; }

    /**
     * Gets the type of stream described by the current instance.
     */
    public get streamType(): number { return this._streamType; }

    /**
     * Gets the priority of the stream described by the current instance.
     */
    public get streamPriority(): number { return this._streamPriority; }

    /**
     * Gets a value indicating that this stream is used for upstream information
     */
    public get upStream(): boolean { return this._upStream; }

    /**
     * Gets a value indicating that a URL string will follow
     */
    public get urlFlag(): boolean { return this._urlFlag; }

    /**
     * Gets the length of URL String
     */
    public get urlLength(): number { return this._urlLength; }

    /**
     * Gets the URL string that points to the location of an SL-packetized stream by name.
     */
    public get urlString(): string { return this._urlString; }

    private static calculateBitRate(bitrate: number): number {
        return bitrate / 1000;
    }
}

1	import FullBox from "./fullBox";	1✔
2	import Mpeg4BoxHeader from "../mpeg4BoxHeader";
3	import {ByteVector, StringType} from "../../byteVector";	1✔
4	import {DescriptorTag} from "../descriptorTag";	1✔
5	import {DescriptorTagReader} from "../descriptorTagReader";	1✔
6	import {File} from "../../file";
7	import {NumberUtils} from "../../utils";	1✔
8
9	/**
10	* This class extends {@link FullBox} to provide an implementation of an Apple
11	* ElementaryStreamDescriptor. This box may appear as a child of a {@link IsoAudioSampleEntry} and
12	* provided further information about an audio stream.
13	*/
14	export default class AppleElementaryStreamDescriptor extends FullBox {	1✔
15	private _dependsOnEsId: number;
16	private _streamDependenceFlag: boolean;
17	private _ocrStreamFlag: boolean;
18	private _ocrEsId: number;
19	private _urlFlag: boolean;
20	private _urlLength: number;
21	private _urlString: string;
22	private _upStream: boolean;
23	private _maximumBitrate: number;
24	private _averageBitrate: number;
25	private _streamId: number;
26	private _streamPriority: number;
27	private _objectTypeId: number;
28	private _streamType: number;
29	private _bufferSizeDB: number;
30	private _decoderConfig: ByteVector;
31
32	/**
33	* Private constructor to force construction via static functions.
34	*/
35	private constructor() {
36	super();	×
37	}
38
39	/**
40	* Constructs and initializes a new instance of {@link AppleElementaryStreamDescriptor} with a provided
41	* header and handler by reading the contents from a specified file.
42	* @param header A {@link Mpeg4BoxHeader} object containing the header to use for the new instance.
43	* @param file A {@link File} object to read the contents of the box from.
44	* @param handlerType Type of the handler box object containing the handler that applies to the
45	* new instance, or undefined if no handler applies.
46	*/
47	public static fromFile(
48	header: Mpeg4BoxHeader,
49	file: File,
50	handlerType: ByteVector
51	): AppleElementaryStreamDescriptor {
52	// ES_Descriptor Specifications
53	// Section 7.2.6.5 http://ecee.colorado.edu/~ecen5653/ecen5653/papers/ISO%2014496-1%202004.PDF
54
55	const instance = new AppleElementaryStreamDescriptor();	×
56	instance.initializeFromHeaderFileAndHandler(header, file, handlerType);	×
57	const boxData = file.readBlock(instance.dataSize);	×
58	instance._decoderConfig = ByteVector.empty();	×
59	const reader = new DescriptorTagReader(boxData);	×
60
61	// Elementary Stream Descriptor Tag
62	if (boxData.get(reader.increaseOffset(1)) !== DescriptorTag.EsDescriptorTag) {	×
63	throw new Error("Invalid Elementary Stream Descriptor, missing tag.");	×
64	}
65
66	// We have a descriptor tag. Check that the remainder of the tag is at least
67	// [
68	// Base (3 bytes) +
69	// DecoderConfigDescriptor (15 bytes) +
70	// SLConfigDescriptor (3 bytes) + OtherDescriptors
71	// ] bytes long
72	const esLength = reader.readLength();	×
73	let minEsLength = 3 + 15 + 3; // Base minimum length	×
74
75	if (esLength < minEsLength) {	×
76	throw new Error("Insufficient data present.");	×
77	}
78
79	instance._streamId = boxData.subarray(reader.offset, 2).toUshort();	×
80	reader.increaseOffset(2); // Done with ES_ID	×
81
82	// 1st bit
83	const flagByte = boxData.get(reader.offset);	×
84	instance._streamDependenceFlag = NumberUtils.uintAnd(NumberUtils.uintRShift(flagByte, 7),0x1) === 0x1;	×
85
86	// 2nd bit
87	instance._urlFlag = NumberUtils.uintAnd(NumberUtils.uintRShift(flagByte, 6), 0x1) === 0x1;	×
88
89	// 3rd bit
90	instance._ocrStreamFlag = NumberUtils.uintAnd(NumberUtils.uintRShift(flagByte, 5), 0x1) === 0x1;	×
91
92	// Last 5 bits and we're done with this byte
93	instance._streamPriority = NumberUtils.uintAnd(flagByte, 0x1f);	×
94
95	reader.increaseOffset(1);	×
96
97	if (instance._streamDependenceFlag) {	×
98	minEsLength += 2; // We need 2 more bytes	×
99
100	if (esLength < minEsLength) {	×
101	throw new Error("Insufficient data present.");	×
102	}
103
104	instance._dependsOnEsId = boxData.subarray(reader.offset, 2).toUshort();	×
105	reader.increaseOffset(2); // Done with stream dependence	×
106	}
107
108	if (instance._urlFlag) {	×
109	minEsLength += 2; // We need 1 more byte	×
110
111	if (esLength < minEsLength) {	×
112	throw new Error("Insufficient data present.");	×
113	}
114
115	instance._urlLength = boxData.get(reader.increaseOffset(1)); // URL Length	×
116	minEsLength += instance._urlLength; // We need URLength more bytes	×
117
118	if (esLength < minEsLength) {	×
119	throw new Error("Insufficient data present.");	×
120	}
121
122	// URL name
123	instance._urlString = boxData.subarray(reader.offset, instance._urlLength).toString(StringType.UTF8);	×
124	reader.increaseOffset(instance._urlLength);	×
125	}
126
127	if (instance._ocrStreamFlag) {	×
128	minEsLength += 2; // We need 2 more bytes	×
129
130	if (esLength < minEsLength) {	×
131	throw new Error("Insufficient data present.");	×
132	}
133
134	instance._ocrEsId = boxData.subarray(reader.offset, 2).toUshort();	×
135	reader.increaseOffset(2); // Done with OCR	×
136	}
137
138	// Loop through all trailing Descriptors Tags
139	while (reader.offset < instance.dataSize) {	×
140	const tag = boxData.get(reader.increaseOffset(1));	×
141	let length: number;
142	switch (tag) {	×
143	case DescriptorTag.DecoderConfigDescriptorTag: // DecoderConfigDescriptor	×
144	/**
145	* Check that the remainder of the tag is at least 13 bytes long
146	* (13 + DecoderSpecificInfo[] + profileLevelIndicationIndexDescriptor[])
147	*/
148	if (reader.readLength() < 13) {	×
149	throw new Error("Could not read data. Too small.");	×
150	}
151
152	// Read a lot of good info.
153	instance._objectTypeId = boxData.get(reader.offset);	×
154	reader.increaseOffset(1);	×
155
156	// First 6 bits
157	const streamByte = boxData.get(reader.offset);	×
158	instance._streamType = NumberUtils.uintRShift(streamByte, 2);	×
159
160	// 7th bit and we're done with the stream bits
161	instance._upStream = NumberUtils.uintAnd(NumberUtils.uintRShift(streamByte, 1), 0x1) === 0x1;	×
162	reader.increaseOffset(1);	×
163
164	instance._bufferSizeDB = boxData.subarray(reader.offset, 3).toUint();	×
165	reader.increaseOffset(3); // Done with bufferSizeDB	×
166
167	const maximumBitrate = boxData.subarray(reader.offset, 4).toUint();	×
168	instance._maximumBitrate = AppleElementaryStreamDescriptor.calculateBitRate(maximumBitrate);	×
169	reader.increaseOffset(4); // Done with maxBitrate	×
170
171	const averageBitrate = boxData.subarray(reader.offset, 4).toUint();	×
172	instance._averageBitrate = AppleElementaryStreamDescriptor.calculateBitRate(averageBitrate);	×
173	reader.increaseOffset(4); // Done with avgBitrate	×
174
175	// If there's a DecoderSpecificInfo[] array at the end it'll pick it up in the while loop
176	break;	×
177
178	case DescriptorTag.DecSpecificInfoTag: // DecoderSpecificInfo
179	// The rest of the info is decoder specific.
180	length = reader.readLength();	×
181
182	instance._decoderConfig = boxData.subarray(reader.offset, length);	×
183	reader.increaseOffset(length); // We're done with the config	×
184	break;	×
185
186	case DescriptorTag.SlConfigDescriptorTag: // SLConfigDescriptor
187	// The rest of the info is SL specific.
188	length = reader.readLength();	×
189
190	// Skip the rest of the descriptor as reported in the length so we can move onto the next one
191	reader.increaseOffset(length);	×
192	break;	×
193
194	case DescriptorTag.Forbidden0:
195	case DescriptorTag.Forbidden255:
196	throw new Error("Invalid Descriptor tag.");	×
197	default:
198	/**
199	* TODO: Should we handle other optional descriptor tags?
200	* ExtensionDescriptor extDescr[0 .. 255];
201	* LanguageDescriptor langDescr[0 .. 1];
202	* IPI_DescPointer ipiPtr[0 .. 1];
203	* IP_IdentificationDataSet ipIDS[0 .. 1];
204	* QoS_Descriptor qosDescr[0 .. 1];
205	*/
206	// Every descriptor starts with a length
207	length = reader.readLength();	×
208
209	// Skip the rest of the descriptor as reported in the length so we can move onto the next one
210	reader.increaseOffset(length);	×
211
212	break;	×
213	}
214	}
215
216	return instance;	×
217	}
218
219	/**
220	* Gets the maximum average the stream described by the current instance.
221	*/
222	public get averageBitrate(): number { return this._averageBitrate; }	×
223
224	/**
225	* Gets the buffer size DB value the stream described by the current instance.
226	*/
227	public get bufferSizeDB(): number { return this._bufferSizeDB; }	×
228
229	/**
230	* Gets the decoder config data of stream described by the current instance.
231	*/
232	public get decoderConfig(): ByteVector { return this._decoderConfig; }	×
233
234	/**
235	* Gets the ES_ID of another elementary stream on which this elementary stream depends
236	*/
237	public get dependsOnEsId(): number { return this._dependsOnEsId; }	×
238
239	/**
240	* Gets the maximum bitrate the stream described by the current instance.
241	*/
242	public get maximumBitrate(): number { return this._maximumBitrate; }	×
243
244	/**
245	* Gets the object type ID of the stream described by the current instance.
246	*/
247	public get objectTypeId(): number { return this._objectTypeId; }	×
248
249	/**
250	* Gets the OCR ES_ID
251	*/
252	public get ocrEsId(): number { return this._ocrEsId; }	×
253
254	/**
255	* Gets the OCR Stream Flag
256	*/
257	public get ocrStreamFlag(): boolean { return this._ocrStreamFlag; }	×
258
259	/**
260	* Gets a value indicating that a dependsOn_ES_ID will follow
261	*/
262	public get streamDependenceFlag(): boolean { return this._streamDependenceFlag; }	×
263
264	/**
265	* Gets the ID of the stream described by the current instance.
266	*/
267	public get streamId(): number { return this._streamId; }	×
268
269	/**
270	* Gets the type of stream described by the current instance.
271	*/
272	public get streamType(): number { return this._streamType; }	×
273
274	/**
275	* Gets the priority of the stream described by the current instance.
276	*/
277	public get streamPriority(): number { return this._streamPriority; }	×
278
279	/**
280	* Gets a value indicating that this stream is used for upstream information
281	*/
282	public get upStream(): boolean { return this._upStream; }	×
283
284	/**
285	* Gets a value indicating that a URL string will follow
286	*/
287	public get urlFlag(): boolean { return this._urlFlag; }	×
288
289	/**
290	* Gets the length of URL String
291	*/
292	public get urlLength(): number { return this._urlLength; }	×
293
294	/**
295	* Gets the URL string that points to the location of an SL-packetized stream by name.
296	*/
297	public get urlString(): string { return this._urlString; }	×
298
299	private static calculateBitRate(bitrate: number): number {
300	return bitrate / 1000;	×
301	}
302	}

benrr101 / node-taglib-sharp / 51161498

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