p2p-media-loader-shaka/lib/stream-utils.js

P2P Media Loader Shaka Player integration

export function createSegment({ segmentReference, externalId, runtimeId, }) {
    const { byteRange, url, startTime, endTime } = getSegmentInfoFromReference(segmentReference);
    return {
        runtimeId: runtimeId ?? getSegmentRuntimeId(url, byteRange),
        externalId,
        byteRange,
        url,
        startTime,
        endTime,
    };
}
export function getSegmentRuntimeIdFromReference(segmentReference) {
    const { url, byteRange } = getSegmentInfoFromReference(segmentReference);
    return getSegmentRuntimeId(url, byteRange);
}
export function getSegmentRuntimeId(url, byteRange) {
    if (!byteRange)
        return url;
    const range = typeof byteRange === "string"
        ? getByteRangeFromHeaderString(byteRange)
        : byteRange;
    if (!range)
        return url;
    return `${url}|${range.start}-${range.end}`;
}
export function getByteRangeFromHeaderString(rangeStr) {
    if (!rangeStr?.includes("bytes="))
        return undefined;
    const range = rangeStr
        .split("=")[1]
        .split("-")
        .map((i) => parseInt(i));
    const [start, end] = range;
    return { start, end };
}
export function getSegmentInfoFromReference(segmentReference) {
    const uris = segmentReference.getUris();
    const responseUrl = uris[1] ?? uris[0];
    const start = segmentReference.getStartByte();
    const end = segmentReference.getEndByte() ?? undefined;
    const startTime = segmentReference.getStartTime();
    const endTime = segmentReference.getEndTime();
    return {
        byteRange: end !== undefined ? { start, end } : undefined,
        url: responseUrl,
        startTime,
        endTime,
    };
}
export function getStreamLastMediaSequence(stream) {
    const { shakaStream } = stream;
    const map = shakaStream.mediaSequenceTimeMap;
    if (!map)
        return;
    const firstMediaSequence = map.keys().next().value;
    if (firstMediaSequence === undefined)
        return;
    return firstMediaSequence + map.size - 1;
}
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