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feat(FormatUtils): support multiple audio tracks in the DASH manifest (#308)

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absidue
2023-02-12 00:34:39 +01:00
committed by GitHub
parent b2900f48a7
commit a69e43bf3a
1 changed files with 74 additions and 15 deletions
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89
src/utils/FormatUtils.ts
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@@ -315,7 +315,7 @@ class FormatUtils {
if (!video_format.index_range || !video_format.init_range) {
return;
}
const mime_type = video_format.mime_type;
const mime_type = video_format.mime_type.split(';')[0];
const mime_type_index = mime_types.indexOf(mime_type);
if (mime_type_index > -1) {
mime_objects[mime_type_index].push(video_format);
@@ -326,23 +326,81 @@ class FormatUtils {
}
});
let set_id = 0;
for (let i = 0; i < mime_types.length; i++) {
const set = this.#el(document, 'AdaptationSet', {
id: `${i}`,
mimeType: mime_types[i].split(';')[0],
startWithSAP: '1',
subsegmentAlignment: 'true'
});
period.appendChild(set);
// When the video has multiple different audio tracks/langues we want to include the extra information in the manifest
if (mime_objects[i][0].has_audio && mime_objects[i][0].language) {
const languages: string[] = [];
const language_objects: Format[][] = [ [] ];
mime_objects[i].forEach((format) => {
if (format.has_video) {
this.#generateRepresentationVideo(document, set, format, url_transformer, cpn, player);
} else {
this.#generateRepresentationAudio(document, set, format, url_transformer, cpn, player);
mime_objects[i].forEach((format) => {
const language_index = languages.indexOf(format.language as string);
if (language_index > -1) {
language_objects[language_index].push(format);
} else {
languages.push(format.language as string);
language_objects.push([]);
language_objects[languages.length - 1].push(format);
}
});
// The lang attribute has to go on the AdaptationSet element, so we need a separate adaptation set for each language
for (let j = 0; j < languages.length; j++) {
const first_format = language_objects[j][0];
const children = [];
if (first_format.audio_track) {
let role;
if (first_format.audio_track.audio_is_default) {
role = 'main';
} else if (first_format.is_dubbed) {
role = 'dub';
} else {
role = 'alternate';
}
children.push(
this.#el(document, 'Role', {
schemeIdUri: 'urn:mpeg:dash:role:2011',
value: role
})
);
}
const set = this.#el(document, 'AdaptationSet', {
id: `${set_id++}`,
mimeType: mime_types[i],
startWithSAP: '1',
subsegmentAlignment: 'true',
lang: languages[j]
}, children);
period.appendChild(set);
language_objects[j].forEach((format) => {
this.#generateRepresentationAudio(document, set, format, url_transformer, cpn, player);
});
}
});
} else {
const set = this.#el(document, 'AdaptationSet', {
id: `${set_id++}`,
mimeType: mime_types[i],
startWithSAP: '1',
subsegmentAlignment: 'true'
});
period.appendChild(set);
mime_objects[i].forEach((format) => {
if (format.has_video) {
this.#generateRepresentationVideo(document, set, format, url_transformer, cpn, player);
} else {
this.#generateRepresentationAudio(document, set, format, url_transformer, cpn, player);
}
});
}
}
}
@@ -388,7 +446,8 @@ class FormatUtils {
set.appendChild(this.#el(document, 'Representation', {
id: format.itag?.toString(),
codecs,
bandwidth: format.bitrate?.toString()
bandwidth: format.bitrate?.toString(),
audioSamplingRate: format.audio_sample_rate?.toString()
}, [
this.#el(document, 'AudioChannelConfiguration', {
schemeIdUri: 'urn:mpeg:dash:23003:3:audio_channel_configuration:2011',