From 911eeb90526327c9c472aceafcc9964302b67ca2 Mon Sep 17 00:00:00 2001
From: Developer <dev@bilibili-app.local>
Date: Tue, 10 Mar 2026 20:09:50 +0800
Subject: [PATCH] fix: use snake_case field names matching Bilibili DASH API
 response
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B站 API 实际返回 segment_base.initialization / index_range
而非 segmentBase.Initialization / indexRange，修正类型定义和 MPD 生成逻辑。
segment_base 设为可选，缺失时不生成 SegmentBase 元素（ExoPlayer fallback）。
---
 services/types.ts |  8 ++++----
 utils/dash.ts     | 20 ++++++++++++--------
 2 files changed, 16 insertions(+), 12 deletions(-)

diff --git a/services/types.ts b/services/types.ts
index 096a19d..8afa297 100644
--- a/services/types.ts
+++ b/services/types.ts
@@ -35,8 +35,8 @@ export interface Comment {
 }
 
 export interface DashSegmentBase {
-  Initialization: string;
-  indexRange: string;
+  initialization: string;
+  index_range: string;
 }
 
 export interface DashVideoItem {
@@ -48,7 +48,7 @@ export interface DashVideoItem {
   width: number;
   height: number;
   frameRate: string;
-  segmentBase: DashSegmentBase;
+  segment_base?: DashSegmentBase;
 }
 
 export interface DashAudioItem {
@@ -57,7 +57,7 @@ export interface DashAudioItem {
   bandwidth: number;
   mimeType: string;
   codecs: string;
-  segmentBase: DashSegmentBase;
+  segment_base?: DashSegmentBase;
 }
 
 export interface PlayUrlResponse {
diff --git a/utils/dash.ts b/utils/dash.ts
index ef90843..9663bea 100644
--- a/utils/dash.ts
+++ b/utils/dash.ts
@@ -15,6 +15,16 @@ 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>`
+    : '';
+  const audioSegmentBase = aSeg
+    ? `\n        <SegmentBase indexRange="${aSeg.index_range}">\n          <Initialization range="${aSeg.initialization}"/>\n        </SegmentBase>`
+    : '';
+
   const xml = `<?xml version="1.0" encoding="UTF-8"?>
 <MPD xmlns="urn:mpeg:dash:schema:mpd:2011"
      profiles="urn:mpeg:dash:profile:isoff-on-demand:2011"
@@ -23,18 +33,12 @@ export function buildDashDataUri(playData: PlayUrlResponse, qn: number): string
   <Period duration="PT${dur}S">
     <AdaptationSet id="1" mimeType="${video.mimeType}" codecs="${video.codecs}" startWithSAP="1" subsegmentAlignment="true">
       <Representation id="v1" bandwidth="${video.bandwidth}" width="${video.width}" height="${video.height}" frameRate="${video.frameRate}">
-        <BaseURL>${escapeXml(video.baseUrl)}</BaseURL>
-        <SegmentBase indexRange="${video.segmentBase.indexRange}">
-          <Initialization range="${video.segmentBase.Initialization}"/>
-        </SegmentBase>
+        <BaseURL>${escapeXml(video.baseUrl)}</BaseURL>${videoSegmentBase}
       </Representation>
     </AdaptationSet>
     <AdaptationSet id="2" mimeType="${audio.mimeType}" codecs="${audio.codecs}" startWithSAP="1" subsegmentAlignment="true">
       <Representation id="a1" bandwidth="${audio.bandwidth}">
-        <BaseURL>${escapeXml(audio.baseUrl)}</BaseURL>
-        <SegmentBase indexRange="${audio.segmentBase.indexRange}">
-          <Initialization range="${audio.segmentBase.Initialization}"/>
-        </SegmentBase>
+        <BaseURL>${escapeXml(audio.baseUrl)}</BaseURL>${audioSegmentBase}
       </Representation>
     </AdaptationSet>
   </Period>