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Code Issues Releases Wiki Activity

codecs: Properly detect Matroska audio/video. Add codec support for AV1 video and DTS audio. Bump to 1.1.4.

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This commit is contained in:
Jeff Schiller 2023-10-19 11:41:02 -07:00
parent 96a74d910c
commit bb0f40394e
7 changed files with 213 additions and 137 deletions
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27
codecs/codecs.js
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@ -53,6 +53,13 @@ const FORMAT_NAME_TO_SHORT_TYPE = {
'wav': 'audio/wav',
}
// https://developer.mozilla.org/en-US/docs/Web/Media/Formats/Containers#webm says that only
// the following codecs are supported for webm:
// - video: AV1, VP8, VP9
// - audio: Opus, Vorbis
const WEBM_AUDIO_CODECS = [ 'opus', 'vorbis' ];
const WEBM_VIDEO_CODECS = [ 'av1', 'vp8', 'vp9' ];
/**
* TODO: Reconcile this with file/sniffer.js findMimeType() which does signature matching.
* @param {ProbeInfo} info
@ -94,9 +101,16 @@ export function getShortMIMEString(info) {
case 'ogg':
subType = 'ogg';
break;
// Should we detect .mkv files as x-matroska?
case 'matroska,webm':
subType = 'webm';
let isWebM = true;
for (const stream of info.streams) {
if ( (stream.codec_type === 'audio' && !WEBM_AUDIO_CODECS.includes(stream.codec_name))
|| (stream.codec_type === 'video' && !WEBM_VIDEO_CODECS.includes(stream.codec_name))) {
isWebM = false;
break;
}
}
subType = isWebM ? 'webm' : 'x-matroska';
break;
default:
throw `Cannot handle format ${formatName} yet. ` +
@ -132,11 +146,12 @@ export function getFullMIMEString(info) {
default:
switch (stream.codec_name) {
case 'aac': codecFrags.add(getMP4ACodecString(stream)); break;
case 'vorbis': codecFrags.add('vorbis'); break;
case 'opus': codecFrags.add('opus'); break;
// I'm going off of what Chromium calls this one, with the dash.
case 'ac3': codecFrags.add('ac-3'); break;
case 'dts': codecFrags.add('dts'); break;
case 'flac': codecFrags.add('flac'); break;
case 'opus': codecFrags.add('opus'); break;
case 'vorbis': codecFrags.add('vorbis'); break;
default:
throw `Could not handle audio codec_name ${stream.codec_name}, ` +
`codec_tag_string ${stream.codec_tag_string} for file ${info.format.filename} yet. ` +
@ -153,10 +168,12 @@ export function getFullMIMEString(info) {
case 'png': continue;
default:
switch (stream.codec_name) {
case 'av1': codecFrags.add('av1'); break;
case 'h264': codecFrags.add(getAVC1CodecString(stream)); break;
case 'mpeg2video': codecFrags.add('mpeg2video'); break;
// Skip mjpeg as a video stream for the codecs string.
case 'mjpeg': break;
case 'mpeg2video': codecFrags.add('mpeg2video'); break;
case 'vp8': codecFrags.add('vp8'); break;
case 'vp9': codecFrags.add(getVP09CodecString(stream)); break;
default:
throw `Could not handle video codec_name ${stream.codec_name}, ` +