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k9p5k9p5
committedJul 31, 2024
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‎.gitignore

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# Logs
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logs
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*.log
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npm-debug.log*
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yarn-debug.log*
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yarn-error.log*
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pnpm-debug.log*
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lerna-debug.log*
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node_modules
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dist-ssr
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*.local
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# Editor directories and files
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.vscode/*
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!.vscode/extensions.json
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.idea
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.DS_Store
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*.suo
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*.ntvs*
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*.njsproj
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*.sln
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*.sw?
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.vscode
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.github/*
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# wasm build file
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src/lib/*.js
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src/lib/*.wasm

‎.gitmodules

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[submodule "lib/FFmpeg"]
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path = lib/FFmpeg
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url = https://github.com/FFmpeg/FFmpeg.git

‎LICENSE

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MIT License
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.

‎Makefile

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FFMPEG_CONFIGURE_ARGS = \
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--target-os=none \
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--arch=x86_32 \
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--cc=emcc \
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--ranlib=emranlib \
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--disable-all \
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--disable-asm \
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--enable-avcodec \
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--enable-avformat \
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--enable-protocol=file
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DEMUX_ARGS = \
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--enable-demuxer=mov,mp4,avi,matroska,webm
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WEB_DEMUXER_ARGS = \
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emcc ./lib/web-demuxer/*.c \
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-I./lib/FFmpeg \
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-L./lib/FFmpeg/libavformat -lavformat \
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-L./lib/FFmpeg/libavutil -lavutil \
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-L./lib/FFmpeg/libavcodec -lavcodec \
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--post-js ./lib/web-demuxer/post.js \
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-lworkerfs.js \
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-O3 \
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-s EXPORT_ES6=1 \
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-s INVOKE_RUN=0 \
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-s ENVIRONMENT=worker \
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-s EXPORTED_RUNTIME_METHODS=cwrap,getValue,UTF8ToString \
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-s EXPORTED_FUNCTIONS=_free \
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-s ASYNCIFY \
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-s WASM_BIGINT \
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-s ALLOW_MEMORY_GROWTH=1
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clean:
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cd lib/FFmpeg && \
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make clean && \
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make distclean
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ffmpeg-lib:
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cd lib/FFmpeg && \
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emconfigure ./configure $(FFMPEG_CONFIGURE_ARGS) $(DEMUX_ARGS) && \
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emmake make
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web-demuxer:
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$(WEB_DEMUXER_ARGS) -o ./dist/ffmpeg.js

‎README.md

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# FFmpeg WASM DEMUXER
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FFmpeg LGPL v2.1 build steps for generating a wasm module using emscripten.
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### Steps to Reproduce
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First execute `npm run dev:docker:arm64` to start a docker container with docker compose.
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Next, execute `npm run build:wasm` to build the demuxer for the specified formats.

‎compose.yaml

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services:
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dev-web-demuxer-arm64:
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container_name: web-demuxer
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image: emscripten/emsdk:3.1.60-arm64
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working_dir: /app
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volumes:
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- ./:/app
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stdin_open: true
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tty: true
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command: ["/bin/bash"]

‎dist/ffmpeg.js

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‎dist/ffmpeg.wasm

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‎lib/web-demuxer/audio_codec_string.c

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#include "audio_codec_string.h"
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#include "libavformat/internal.h"
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#include "libavutil/avstring.h"
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#include "libavutil/intreadwrite.h"
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// sync with ff_mp4_obj_type in isom.c
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const AVCodecTag _ff_mp4_obj_type[] = {
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{ AV_CODEC_ID_MOV_TEXT , 0x08 },
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{ AV_CODEC_ID_MPEG4 , 0x20 },
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{ AV_CODEC_ID_H264 , 0x21 },
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{ AV_CODEC_ID_HEVC , 0x23 },
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{ AV_CODEC_ID_AAC , 0x40 },
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{ AV_CODEC_ID_MP4ALS , 0x40 }, /* 14496-3 ALS */
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{ AV_CODEC_ID_MPEG2VIDEO , 0x61 }, /* MPEG-2 Main */
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{ AV_CODEC_ID_MPEG2VIDEO , 0x60 }, /* MPEG-2 Simple */
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{ AV_CODEC_ID_MPEG2VIDEO , 0x62 }, /* MPEG-2 SNR */
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{ AV_CODEC_ID_MPEG2VIDEO , 0x63 }, /* MPEG-2 Spatial */
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{ AV_CODEC_ID_MPEG2VIDEO , 0x64 }, /* MPEG-2 High */
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{ AV_CODEC_ID_MPEG2VIDEO , 0x65 }, /* MPEG-2 422 */
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{ AV_CODEC_ID_AAC , 0x66 }, /* MPEG-2 AAC Main */
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{ AV_CODEC_ID_AAC , 0x67 }, /* MPEG-2 AAC Low */
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{ AV_CODEC_ID_AAC , 0x68 }, /* MPEG-2 AAC SSR */
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{ AV_CODEC_ID_MP3 , 0x69 }, /* 13818-3 */
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{ AV_CODEC_ID_MP2 , 0x69 }, /* 11172-3 */
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{ AV_CODEC_ID_MPEG1VIDEO , 0x6A }, /* 11172-2 */
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{ AV_CODEC_ID_MP3 , 0x6B }, /* 11172-3 */
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{ AV_CODEC_ID_MJPEG , 0x6C }, /* 10918-1 */
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{ AV_CODEC_ID_PNG , 0x6D },
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{ AV_CODEC_ID_JPEG2000 , 0x6E }, /* 15444-1 */
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{ AV_CODEC_ID_VC1 , 0xA3 },
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{ AV_CODEC_ID_DIRAC , 0xA4 },
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{ AV_CODEC_ID_AC3 , 0xA5 },
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{ AV_CODEC_ID_EAC3 , 0xA6 },
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{ AV_CODEC_ID_DTS , 0xA9 }, /* mp4ra.org */
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{ AV_CODEC_ID_OPUS , 0xAD }, /* mp4ra.org */
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{ AV_CODEC_ID_VP9 , 0xB1 }, /* mp4ra.org */
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{ AV_CODEC_ID_TSCC2 , 0xD0 }, /* nonstandard, camtasia uses it */
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{ AV_CODEC_ID_EVRC , 0xD1 }, /* nonstandard, pvAuthor uses it */
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{ AV_CODEC_ID_VORBIS , 0xDD }, /* nonstandard, gpac uses it */
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{ AV_CODEC_ID_DVD_SUBTITLE, 0xE0 }, /* nonstandard, see unsupported-embedded-subs-2.mp4 */
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{ AV_CODEC_ID_QCELP , 0xE1 },
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{ AV_CODEC_ID_MPEG4SYSTEMS, 0x01 },
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{ AV_CODEC_ID_MPEG4SYSTEMS, 0x02 },
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{ AV_CODEC_ID_NONE , 0 },
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};
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void set_aac_codec_string(char *str, size_t str_size, AVCodecParameters *par)
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{
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av_strlcpy(str, "mp4a", str_size);
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const AVCodecTag *tags[1] = { NULL };
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uint32_t oti;
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tags[0] = _ff_mp4_obj_type;
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oti = av_codec_get_tag(tags, par->codec_id);
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if (oti)
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av_strlcatf(str, str_size, ".%02" PRIx32, oti);
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else
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return;
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if (par->extradata_size >= 2)
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{
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int aot = par->extradata[0] >> 3;
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if (aot == 31)
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aot = ((AV_RB16(par->extradata) >> 5) & 0x3f) + 32;
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av_strlcatf(str, str_size, ".%d", aot);
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}
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}
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void set_audio_codec_string(char *str, size_t str_size, AVCodecParameters *par)
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{
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switch (par->codec_id)
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{
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case AV_CODEC_ID_FLAC:
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av_strlcpy(str, "flac", str_size);
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break;
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case AV_CODEC_ID_MP3:
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av_strlcpy(str, "mp3", str_size);
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break;
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case AV_CODEC_ID_AAC:
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set_aac_codec_string(str, str_size, par);
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break;
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case AV_CODEC_ID_OPUS:
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av_strlcpy(str, "opus", str_size);
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break;
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case AV_CODEC_ID_VORBIS:
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av_strlcpy(str, "vorbis", str_size);
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break;
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case AV_CODEC_ID_PCM_MULAW:
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av_strlcpy(str, "ulaw", str_size);
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break;
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case AV_CODEC_ID_PCM_ALAW:
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av_strlcpy(str, "alaw", str_size);
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break;
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case AV_CODEC_ID_PCM_U8:
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av_strlcpy(str, "pcm-u8", str_size);
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break;
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case AV_CODEC_ID_PCM_S16LE:
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case AV_CODEC_ID_PCM_S16BE:
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av_strlcpy(str, "pcm-s16", str_size);
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break;
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case AV_CODEC_ID_PCM_S24LE:
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case AV_CODEC_ID_PCM_S24BE:
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av_strlcpy(str, "pcm-s24", str_size);
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break;
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case AV_CODEC_ID_PCM_S32LE:
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case AV_CODEC_ID_PCM_S32BE:
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av_strlcpy(str, "pcm-s32", str_size);
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break;
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case AV_CODEC_ID_PCM_F32LE:
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case AV_CODEC_ID_PCM_F32BE:
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av_strlcpy(str, "pcm-f32", str_size);
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break;
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default:
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av_strlcpy(str, "undf", str_size);
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break;
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}
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}

‎lib/web-demuxer/audio_codec_string.h

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#include "libavformat/avformat.h"
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void set_audio_codec_string(char *str, size_t str_size, AVCodecParameters *par);

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