@yume-chan/scrcpy-decoder-webcodecs/esm/video/codec/h26x.js

Raw H.264 stream decoder and renderer using WebCodecs API (requires modern browser).

export class H26xDecoder {
    #config;
    #decoder;
    constructor(decoder) {
        this.#decoder = decoder;
    }
    decode(packet) {
        if (packet.type === "configuration") {
            this.#config = packet.data;
            this.configure(packet.data);
            return;
        }
        // For H.264 and H.265, when the stream is in Annex B format
        // (which Scrcpy uses, as Android MediaCodec produces),
        // configuration data needs to be combined with the first frame data.
        // https://www.w3.org/TR/webcodecs-avc-codec-registration/#encodedvideochunk-type
        let data;
        if (this.#config !== undefined) {
            data = new Uint8Array(this.#config.length + packet.data.length);
            data.set(this.#config, 0);
            data.set(packet.data, this.#config.length);
            this.#config = undefined;
        }
        else {
            data = packet.data;
        }
        this.#decoder.decode(new EncodedVideoChunk({
            // Treat `undefined` as `key`, otherwise won't decode.
            type: packet.keyframe === false ? "delta" : "key",
            timestamp: 0,
            data,
        }));
    }
}
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