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fix: switch DASH delivery from data: URI to local MPD file via expo-file-system

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data: URI scheme for DASH manifests is unreliable in ExoPlayer.
Write MPD XML to FileSystem.cacheDirectory/bili_dash.mpd and pass
file:// URI to react-native-video instead. URL resolution is now
async via useEffect+state in NativeVideoPlayer.
This commit is contained in:
Developer
2026-03-10 20:16:01 +08:00
parent 911eeb9052
commit 35371cebff
4 changed files with 41 additions and 26 deletions
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22
utils/dash.ts
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@@ -1,11 +1,18 @@
import * as FileSystem from 'expo-file-system/legacy';
import type { PlayUrlResponse } from '../services/types';
/**
* 从 Bilibili DASH 响应生成 MPD data URI。
* 将 Bilibili DASH 响应写成 MPD 文件，返回 file:// URI 供 ExoPlayer 播放。
* 选取 id === qn 的视频流（找不到则取第一条），带宽最高的音频流。
* 返回 "data:application/dash+xml;base64,..." 供 react-native-video (ExoPlayer) 使用。
*/
export function buildDashDataUri(playData: PlayUrlResponse, qn: number): string {
export async function buildDashMpdUri(playData: PlayUrlResponse, qn: number): Promise<string> {
const xml = buildMpdXml(playData, qn);
const path = `${FileSystem.cacheDirectory}bili_dash.mpd`;
await FileSystem.writeAsStringAsync(path, xml, { encoding: FileSystem.EncodingType.UTF8 });
return path;
}
function buildMpdXml(playData: PlayUrlResponse, qn: number): string {
const dash = playData.dash!;
const video = dash.video.find(v => v.id === qn) ?? dash.video[0];
@@ -14,18 +21,17 @@ export function buildDashDataUri(playData: PlayUrlResponse, qn: number): string
);
const dur = dash.duration;
const vSeg = video.segment_base;
const aSeg = audio.segment_base;
const videoSegmentBase = vSeg
? `\n <SegmentBase indexRange="${vSeg.index_range}">\n <Initialization range="${vSeg.initialization}"/>\n </SegmentBase>`
? `\n <SegmentBase indexRange="${vSeg.index_range}"><Initialization range="${vSeg.initialization}"/></SegmentBase>`
: '';
const audioSegmentBase = aSeg
? `\n <SegmentBase indexRange="${aSeg.index_range}">\n <Initialization range="${aSeg.initialization}"/>\n </SegmentBase>`
? `\n <SegmentBase indexRange="${aSeg.index_range}"><Initialization range="${aSeg.initialization}"/></SegmentBase>`
: '';
const xml = `<?xml version="1.0" encoding="UTF-8"?>
return `<?xml version="1.0" encoding="UTF-8"?>
<MPD xmlns="urn:mpeg:dash:schema:mpd:2011"
profiles="urn:mpeg:dash:profile:isoff-on-demand:2011"
type="static"
@@ -43,8 +49,6 @@ export function buildDashDataUri(playData: PlayUrlResponse, qn: number): string
</AdaptationSet>
</Period>
</MPD>`;
return `data:application/dash+xml;base64,${btoa(xml)}`;
}
function escapeXml(s: string): string {