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37 lines
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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Switch audio track. Note: Frontend should handle saving series preferences after this command succeeds"><title>player_switch_audio_track in jellytau_lib::commands::player - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../../static.files/rustdoc-17e0aaed.css"><meta name="rustdoc-vars" data-root-path="../../../" data-static-root-path="../../../static.files/" data-current-crate="jellytau_lib" data-themes="" data-resource-suffix="" data-rustdoc-version="1.97.1 (8bab26f4f 2026-07-14)" data-channel="1.97.1" data-search-js="search-fd9372ac.js" data-stringdex-js="stringdex-2da4960a.js" data-settings-js="settings-170eb4bf.js" ><script src="../../../static.files/storage-41dd4d93.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../../static.files/main-fcd733ba.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-f7c3ffd8.css"></noscript><link rel="alternate icon" type="image/png" href="../../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../../static.files/favicon-044be391.svg"></head><body class="rustdoc fn"><a class="skip-main-content" href="#main-content">Skip to main content</a><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><rustdoc-topbar><h2><a href="#">player_switch_audio_track</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../../jellytau_lib/index.html">jellytau_<wbr>lib</a><span class="version">0.11.1</span></h2></div><div class="sidebar-elems"><div id="rustdoc-modnav"><h2><a href="index.html">In jellytau_<wbr>lib::<wbr>commands::<wbr>player</a></h2></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content" tabindex="-1"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="../../index.html">jellytau_lib</a>::<wbr><a href="../index.html">commands</a>::<wbr><a href="index.html">player</a></div><h1>Function <span class="fn">player_<wbr>switch_<wbr>audio_<wbr>track</span> <button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../../src/jellytau_lib/commands/player/mod.rs.html#1636-1772">Source</a> </span></div><pre class="rust item-decl"><code>pub async fn player_switch_audio_track(
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player: State<'_, <a class="struct" href="struct.PlayerStateWrapper.html" title="struct jellytau_lib::commands::player::PlayerStateWrapper">PlayerStateWrapper</a>>,
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repository_manager: State<'_, <a class="struct" href="../repository/struct.RepositoryManagerWrapper.html" title="struct jellytau_lib::commands::repository::RepositoryManagerWrapper">RepositoryManagerWrapper</a>>,
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repository_handle: <a class="struct" href="https://doc.rust-lang.org/1.97.1/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>,
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stream_index: <a class="primitive" href="https://doc.rust-lang.org/1.97.1/std/primitive.i32.html">i32</a>,
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array_index: <a class="primitive" href="https://doc.rust-lang.org/1.97.1/std/primitive.i32.html">i32</a>,
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use_html5: <a class="primitive" href="https://doc.rust-lang.org/1.97.1/std/primitive.bool.html">bool</a>,
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current_position: <a class="enum" href="https://doc.rust-lang.org/1.97.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/1.97.1/std/primitive.f64.html">f64</a>>,
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media_source_id: <a class="enum" href="https://doc.rust-lang.org/1.97.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="https://doc.rust-lang.org/1.97.1/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>>,
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) -> <a class="enum" href="https://doc.rust-lang.org/1.97.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="enum" href="enum.AudioTrackSwitchResponse.html" title="enum jellytau_lib::commands::player::AudioTrackSwitchResponse">AudioTrackSwitchResponse</a>, <a class="struct" href="https://doc.rust-lang.org/1.97.1/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>></code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Switch audio track.
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Note: Frontend should handle saving series preferences after this command succeeds</p>
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<p>What decides the route is <strong>whether the stream in front of the engine
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carries the requested track at all</strong> — see
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<a href="../../player/track_switch/fn.determine_audio_track_switch_strategy.html" title="fn jellytau_lib::player::track_switch::determine_audio_track_switch_strategy"><code>determine_audio_track_switch_strategy</code></a>:</p>
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<ul>
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<li>An HTML5 <code><video></code> element has no track-selection API, so the stream is
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always re-opened at the chosen <code>AudioStreamIndex</code> and the frontend seeks
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the reloaded element back to <code>position</code>.</li>
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<li>A native backend playing a <strong>direct play</strong> holds the source file with
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every track in it, so ExoPlayer selects in place by track-group index.</li>
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<li>A native backend playing a <strong>transcode</strong> does not. Jellyfin builds a
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transcode around one <code>AudioStreamIndex</code>, so the alternate tracks are not
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in the stream; the switch has to re-open it, which this command does
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itself and resumes at <code>current_position</code>.</li>
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</ul>
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<p>That last case is a bug fix, and it was the common case on Android: any
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source whose default audio codec the device cannot decode is transcoded, so
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ExoPlayer saw <code>Audio tracks: 1</code> while the menu listed every track in the
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file. The old code called <code>setAudioTrack(n)</code> regardless, which indexes
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ExoPlayer’s audio track <em>groups</em>, found nothing at <code>n</code>, warned <code>Invalid audio track index</code> and dropped the request — the default track just kept
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playing, with nothing in the UI saying so.</p>
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<p>libmpv implements neither selection nor reload here — it is the audio-only
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backend and leaves <code>PlayerBackend::set_audio_track</code> at its
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<code>not_implemented()</code> default, which is why IR-019 is met by these paths
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rather than by MPV.</p>
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<p>TRACES: UR-021, UR-005 | IR-019, DR-024, DR-258</p>
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</div></details></section></div></main></body></html> |