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`SourcesQueueOutput.try_seek()` after `SourcesQueueInput.append()` fails until output is first iterated.

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难度
3/5
预计耗时
1-2 天
新手友好度
62/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
活跃
技术栈
rust

调研方向

Start with SourcesQueueOutput.try_seek() and the queue implementation in the queue module, then inspect how SourcesQueueInput.append() updates the output state. Reproduce the issue using the Rust snippet in the report, comparing seek before and after next(). Done when seeking succeeds immediately after appending a source, with a regression test covering that sequence.

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描述

I'm writing an application that uses Rodio to play audio from a queue, and I want users to be able to load a file (appending it to a queue) and seek on that file before playback begins. However, after appending a source to a newly created queue, calling .try_seek() on SourcesQueueOutput fails unless next() is called on it at least once. This behavior feels unintuitive, and can be awkward to work around if SourcesQueueOutput is being accessed through some other object that owns it and doesn't provide an easy way to call next() (i.e. if it had been appended to a Player, which is what my application is currently doing).

(here the code snippet I used to isolate this behavior)

use std::time::Duration;
use rodio::{ buffer::SamplesBuffer, queue::queue, math::nz };
let (tx, mut rx) = queue(false);
tx.append(SamplesBuffer::new(nz!(1), nz!(48000), vec![1.0, 1.5, 2.0]));
rx.next()  // if next() is not called at least once, the assertion fails.
let result = rx.try_seek(Duration::default());
assert!(result.is_ok(), "Seek failed after append()");
主要语言
Rust
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