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杜比HDR

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Developer
2026-03-19 16:38:18 +08:00
parent 462a090599
commit 46796d3d6d
5 changed files with 38 additions and 10 deletions
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24
utils/dash.ts
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@@ -1,5 +1,5 @@
import * as FileSystem from 'expo-file-system/legacy';
import type { PlayUrlResponse } from '../services/types';
import type { PlayUrlResponse, DashAudioItem } from '../services/types';
/**
* 将 Bilibili DASH 响应写成 MPD 文件，返回 file:// URI 供 ExoPlayer 播放。
@@ -12,13 +12,20 @@ export async function buildDashMpdUri(playData: PlayUrlResponse, qn: number): Pr
return path;
}
function isDolbyVision(codecs: string): boolean {
return /^(dvhe|dvh1)/.test(codecs);
}
function buildMpdXml(playData: PlayUrlResponse, qn: number): string {
const dash = playData.dash!;
const video = dash.video.find(v => v.id === qn) ?? dash.video[0];
const audio = dash.audio.reduce((best, a) =>
a.bandwidth > best.bandwidth ? a : best
);
// 优先使用杜比全景声音轨，回退到带宽最高的普通音轨
const dolbyAudios = playData.dolby?.audio;
const audio: DashAudioItem = (dolbyAudios && dolbyAudios.length > 0)
? dolbyAudios.reduce((best, a) => a.bandwidth > best.bandwidth ? a : best)
: dash.audio.reduce((best, a) => a.bandwidth > best.bandwidth ? a : best);
const dur = dash.duration;
const vSeg = video.segment_base;
@@ -31,13 +38,18 @@ function buildMpdXml(playData: PlayUrlResponse, qn: number): string {
? `\n <SegmentBase indexRange="${aSeg.index_range}"><Initialization range="${aSeg.initialization}"/></SegmentBase>`
: '';
const isDV = isDolbyVision(video.codecs);
const dvProperty = isDV
? `\n <SupplementalProperty schemeIdUri="tag:dolby.com,2016:dash:dolby_vision_profile:2014" value="${video.codecs}"/>`
: '';
return `<?xml version="1.0" encoding="UTF-8"?>
<MPD xmlns="urn:mpeg:dash:schema:mpd:2011"
profiles="urn:mpeg:dash:profile:isoff-on-demand:2011"
profiles="urn:mpeg:dash:profile:isoff-on-demand:2011,http://dashif.org/guidelines/dash-if-simple"
type="static"
mediaPresentationDuration="PT${dur}S">
<Period duration="PT${dur}S">
<AdaptationSet id="1" mimeType="${video.mimeType}" codecs="${video.codecs}" startWithSAP="1" subsegmentAlignment="true">
<AdaptationSet id="1" mimeType="${video.mimeType}" codecs="${video.codecs}" startWithSAP="1" subsegmentAlignment="true">${dvProperty}
<Representation id="v1" bandwidth="${video.bandwidth}" width="${video.width}" height="${video.height}" frameRate="${video.frameRate}">
<BaseURL>${escapeXml(video.baseUrl)}</BaseURL>${videoSegmentBase}
</Representation>