Media: Update alt document handling (#5035)

src/api/gramjs/apiBuilders/messageContent.ts

@@ -118,8 +118,8 @@ export function buildMessageMediaContent(
   if (photo) return { photo };
 
   const video = buildVideo(media);
-  const altVideo = buildAltVideo(media);
+  const altVideos = buildAltVideos(media);
-  if (video) return { video, altVideo };
+  if (video) return { video, altVideos };
 
   const audio = buildAudio(media);
   if (audio) return { audio };
@@ -280,16 +280,20 @@ function buildVideo(media: GramJs.TypeMessageMedia): ApiVideo | undefined {
   return buildVideoFromDocument(media.document, media.spoiler);
 }
 
-function buildAltVideo(media: GramJs.TypeMessageMedia): ApiVideo | undefined {
+function buildAltVideos(media: GramJs.TypeMessageMedia): ApiVideo[] | undefined {
-  if (
+  if (!(media instanceof GramJs.MessageMediaDocument) || !media.altDocuments) {
-    !(media instanceof GramJs.MessageMediaDocument)
-    || !(media.altDocument instanceof GramJs.Document)
-    || !media.altDocument.mimeType.startsWith('video')
-  ) {
     return undefined;
   }
 
-  return buildVideoFromDocument(media.altDocument, media.spoiler);
+  const altVideos = media.altDocuments.filter((d): d is GramJs.Document => (
+    d instanceof GramJs.Document && d.mimeType.startsWith('video')
+  )).map((alt) => buildVideoFromDocument(alt, media.spoiler))
+    .filter(Boolean);
+  if (!altVideos.length) {
+    return undefined;
+  }
+
+  return altVideos;
 }
 
 function buildAudio(media: GramJs.TypeMessageMedia): ApiAudio | undefined {

src/api/gramjs/helpers.ts

@@ -126,9 +126,11 @@ export function addStoryToLocalDb(story: GramJs.TypeStoryItem, peerId: string) {
       addDocumentToLocalDb(doc);
     }
 
-    if (story.media.altDocument instanceof GramJs.Document) {
+    if (story.media.altDocuments) {
-      const doc = addStoryRepairInfo(story.media.altDocument, peerId, story);
+      for (const altDocument of story.media.altDocuments) {
-      addDocumentToLocalDb(doc);
+        const doc = addStoryRepairInfo(altDocument, peerId, story);
+        addDocumentToLocalDb(doc);
+      }
     }
   }
 }

src/api/types/messages.ts

@@ -601,7 +601,7 @@ export type MediaContent = {
   text?: ApiFormattedText;
   photo?: ApiPhoto;
   video?: ApiVideo;
-  altVideo?: ApiVideo;
+  altVideos?: ApiVideo[];
   document?: ApiDocument;
   sticker?: ApiSticker;
   contact?: ApiContact;

src/components/story/hooks/useStoryPreloader.ts

@@ -101,7 +101,7 @@ function getPreloadMediaHashes(peerId: string, storyId: number) {
     });
     // Thumbnail
     mediaHashes.push({ hash: getStoryMediaHash(story), format: ApiMediaFormat.BlobUrl });
-    if (story.content.altVideo) {
+    if (story.content.altVideos) {
       mediaHashes.push({
         hash: getStoryMediaHash(story, 'full', true)!,
         format: ApiMediaFormat.Progressive,

src/global/helpers/media.ts

@@ -1,8 +1,9 @@
-import type { ApiStory } from '../../api/types';
+import type { ApiStory, ApiVideo } from '../../api/types';
 
 import { getPhotoMediaHash, getVideoMediaHash } from './messageMedia';
 
 type StorySize = 'pictogram' | 'preview' | 'full' | 'download';
+const STORY_ALT_VIDEO_WIDTH = 480;
 
 export function getStoryMediaHash(
   story: ApiStory, size: StorySize, isAlt: true,
@@ -15,14 +16,22 @@ export function getStoryMediaHash(
   const isVideo = Boolean(story.content.video);
 
   if (isVideo) {
-    if (isAlt && !story.content.altVideo) return undefined;
+    if (isAlt && !story.content.altVideos) return undefined;
-    const media = isAlt ? story.content.altVideo! : story.content.video!;
+    const media = isAlt ? getPreferredAlt(story.content.altVideos!) : story.content.video!;
     return getVideoMediaHash(media, size);
   }
 
   return getPhotoMediaHash(story.content.photo!, size);
 }
 
+function getPreferredAlt(alts: ApiVideo[]) {
+  const alt = alts.reduce((prev, curr) => (
+    Math.abs((curr.width || 0) - STORY_ALT_VIDEO_WIDTH) < Math.abs((prev.width || 0) - STORY_ALT_VIDEO_WIDTH)
+      ? curr : prev
+  ));
+  return alt;
+}
+
 export function getStoryKey(chatId: string, storyId: number) {
   return `story${chatId}-${storyId}`;
 }

src/lib/gramjs/tl/api.d.ts

@@ -1788,7 +1788,7 @@ namespace Api {
     round?: true;
     voice?: true;
     document?: Api.TypeDocument;
-    altDocument?: Api.TypeDocument;
+    altDocuments?: Api.TypeDocument[];
     ttlSeconds?: int;
   } | void> {
     // flags: undefined;
@@ -1798,7 +1798,7 @@ namespace Api {
     round?: true;
     voice?: true;
     document?: Api.TypeDocument;
-    altDocument?: Api.TypeDocument;
+    altDocuments?: Api.TypeDocument[];
     ttlSeconds?: int;
   };
   export class MessageMediaWebPage extends VirtualClass<{