137 lines
3.2 KiB
TypeScript
137 lines
3.2 KiB
TypeScript
// @ts-nocheck
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/*
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* This file is part of the libav.js WebCodecs Polyfill implementation. The
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* interface implemented is derived from the W3C standard. No attribution is
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* required when using this library.
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*
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* Copyright (c) 2021 Yahweasel
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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import type * as LibAVJS from '../libav.types';
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declare let LibAV: LibAVJS.LibAVWrapper;
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// Currently available libav instances
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const libavs: LibAVJS.LibAV[] = [];
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// Options required to create a LibAV instance
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let libavOptions: any = {};
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/**
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* Supported decoders.
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*/
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export let decoders: string[] = null;
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/**
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* libav.js-specific codec request, used to bypass the codec registry and use
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* anything your implementation of libav.js supports.
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*/
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export interface LibAVJSCodec {
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codec: string;
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ctx?: LibAVJS.AVCodecContextProps;
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options?: Record<string, string>;
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}
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/**
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* Set the libav loading options.
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*/
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export function setLibAVOptions(to: any) {
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libavOptions = to;
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}
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/**
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* Get a libav instance.
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*/
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export async function get(): Promise<LibAVJS.LibAV> {
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if (libavs.length) {
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return libavs.shift();
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}
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return LibAV.LibAV(libavOptions);
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}
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/**
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* Free a libav instance for later reuse.
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*/
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export function free(libav: LibAVJS.LibAV) {
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libavs.push(libav);
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}
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/**
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* Get the list of encoders/decoders supported by libav (which are also
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* supported by this polyfill)
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*/
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async function codecs(): Promise<string[]> {
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const libav = await get();
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const ret: string[] = [];
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for (const [avname, codec] of [
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['libaom-av1', 'av01'],
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['h264', 'avc1'],
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['hevc', 'hvc1'],
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]) {
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if (await libav.avcodec_find_decoder_by_name(avname)) {
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ret.push(codec);
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}
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}
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free(libav);
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return ret;
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}
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/**
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* Load the lists of supported decoders and encoders.
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*/
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export async function load() {
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decoders = await codecs();
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}
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/**
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* Convert a decoder from the codec registry (or libav.js-specific parameters)
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* to libav.js. Returns null if unsupported.
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*/
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export function decoder(codec: string | { libavjs: LibAVJSCodec }): LibAVJSCodec {
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if (typeof codec === 'string') {
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codec = codec.replace(/\..*/, '');
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let outCodec: string = codec;
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switch (codec) {
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// Video
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case 'av01':
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outCodec = 'libaom-av1';
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break;
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case 'avc1':
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outCodec = 'h264';
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break;
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case 'hvc1':
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outCodec = 'hevc';
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break;
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// Unrecognized
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default:
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return null;
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}
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// Check whether we actually support this codec
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if (!(decoders.indexOf(codec) >= 0)) {
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return null;
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}
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return { codec: outCodec };
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} else {
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return codec.libavjs;
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}
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}
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