bytedeco/javacv

Using soundtouch to change the tone will cause noise

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#1,833 opened on Jun 30, 2022

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Description

Hello, author. I have successfully transplanted SoundTouch to Android, and I want to achieve a player that supports tune-changing and unvariable speed. I use FFMPEG in JavacV to decode audio, and then play PCM data through AudioTrack after obtaining PCM data. However, when I use SoundTouch for audio modulation, my audio is two-channel, and I set soundTouch to stereo mode, but it plays with noise. If I set SoundTouch to mono, I don't have this problem, but there is a slight hum when I lower the pitch. Do you know what the problem is ?

Here is my sample program image image

Contributor guide

Research direction
Inspect the audio format settings (sample rate, channels, bit depth) in the FFmpeg decoding and SoundTouch configuration. Verify that the PCM buffer is correctly interleaved for stereo and that SoundTouch is configured with the same number of channels as the audio. Check for any sample format mismatch or buffer size issues.
Tech stack
javaandroid
Domain
mobile
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Needs investigation
Prerequisites
JavaAndroidFFmpeg
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50