jeromewu

#!/bin/bash           
                       
NPROC=$(grep -c ^processor /proc/cpuinfo)
BUILD_DIR=$PWD/build     

git submodule add [email protected]:jeromewu/lame.git third_party/lame

cd third_party/lame
git checkout 3.100
emconfigure ./configure --prefix=$BUILD_DIR

jeromewu

emcc \
    -Llibavcodec -Llibavdevice -Llibavfilter -Llibavformat -Llibavresample -Llibavutil -Llibpostproc -Llibswscale -Llibswresample \
    -Qunused-arguments -Oz \
    -o javascript/ffmpeg-core.js fftools/ffmpeg_opt.o fftools/ffmpeg_filter.o fftools/ffmpeg_hw.o fftools/cmdutils.o fftools/ffmpeg.o \
    -lavdevice -lavfilter -lavformat -lavcodec -lswresample -lswscale -lavutil -lm \
    -s MODULARIZE=1 \
    -s EXPORTED_FUNCTIONS="[_ffmpeg]" \
    -s EXTRA_EXPORTED_RUNTIME_METHODS="[cwrap, FS, getValue, setValue]" \
    -s TOTAL_MEMORY=33554432 \
    -s ALLOW_MEMORY_GROWTH=1

jeromewu

const fs = require('fs');
const ffmpeg = require('@ffmpeg/ffmpeg');

(async () => {
  await ffmpeg.load();
  const data = ffmpeg.transcode('./input.avi', 'mp4');
  fs.writeFileSync('./output.mp4', data);
})();

jeromewu

const { setModule } = require('./util/module');
const FFmpegCore = require('./ffmpeg-core');

module.exports = () => (
  new Promise((resolve, reject) => {
    FFmpegCore()
      .then((Module) => {
        setModule(Module);
        resolve();
      });

jeromewu

const { getModule } = require('./module');

module.exports = (s) => {
  const Module = getModule();
  const ptr = Module._malloc((s.length+1)*Uint8Array.BYTES_PER_ELEMENT);
  for (let i = 0; i < s.length; i++) {
    Module.setValue(ptr+i, s.charCodeAt(i), 'i8');
  }
  Module.setValue(ptr+s.length, 0, 'i8');
  return ptr;

jeromewu

const { getModule } = require('./module');
const str2ptr = require('./str2ptr');

module.exports = (strList) => {
  const Module = getModule();
  const listPtr = Module._malloc(strList.length*Uint32Array.BYTES_PER_ELEMENT);

  strList.forEach((s, idx) => {
    const strPtr = str2ptr(s);
    Module.setValue(listPtr + (4*idx), strPtr, 'i32');

jeromewu

const fs = require('fs');
const { getModule } = require('./util/module');
const strList2ptr = require('./util/strList2ptr');

module.exports = (inputPath, outputExt) => {
  const Module = getModule();
  const data = new Uint8Array(fs.readFileSync(inputPath));
  const ffmpeg = Module.cwrap('ffmpeg', 'number', ['number', 'number']);
  const args = ['./ffmpeg', '-i', 'input.avi', `output.${outputExt}`];
  Module.FS.writeFile('input.avi', data);

jeromewu

/**
 * This script is loaded by ffmpegwasm-v0.2.js
 */

let Module = null;
let ffmpeg = null;

const load = () => {
  global.importScripts('./ffmpeg-core.js');
  global.Module()

jeromewu

const resolves = {};
const rejects = {};

const worker = new Worker('./worker.js');

worker.onmessage = ({ action, payload }) => {
  resolves[action](payload);
};

exports.load = () => new Promise((resolve) => {

jeromewu

const { load, transcode } = require('./ffmpegwasm-v0.2');

(async () => {
  await load();
  const { data } = await transcode(mediaData, 'mp4');
  // do something with data
})();