[GitHub] [cordova-plugin-media-capture] ityoung2016 opened a new issue #143: How to initialize sampling rate in cordova-plugin-media-capture?

[GitBox <gi...@apache.org>]

ityoung2016 opened a new issue #143: How to initialize sampling rate in cordova-plugin-media-capture?
URL: https://github.com/apache/cordova-plugin-media-capture/issues/143
 
 
   # Bug Report
   iPhone sampling rate starts wrong and later 'corrects itself'
   
   ## Problem
   Using the plugin I record and playback audio. On my iPad everything is fine. On the iPhone the sampling rate changes between the first recording and subsequent recordings. How can I initialize the app so that all recordings are at 44100Hz? 
   
   ### What is expected to happen?
   On my iPhone (and iPad) I expect a constant sampling rate of 44100Hz.
   
   ### What does actually happen?
   On my iPad (iOS 12.+) everything works as expected. On my iPhone (iOS 12.+) the first recording takes place at a sampling rate of **48000Hz**. *Subsequent* recordings are at the desired rate of 44100Hz.
   
   ## Information
   <!-- Include all relevant information that might help understand and reproduce the problem -->
    I verified this using an external tone of 1000Hz and spectral analysis on the two devices. The analysis shows a frequency of 1000Hz on the iPad but the first time on the iPhone this frequency is 918.75HZ = 1000*(44100/48000). For the record, the same cordova-generated app is run on both devices, no error messages are generated, and I do not change the sampling rate on the iPhone. It happens “by itself” through the plugin.
   
   ### Command or Code
   <!-- What command or code is needed to reproduce the problem? -->
     function audioMedia(val) {
   	mediaType = 'audio';
   	var audioNum = val;
   	myAudio = null;
   	
   	// captureAudioSuccess callback
   	var captureAudioSuccess = function(mediaFiles) {
   		acquired[audioNum] = true;
   		var path = null;
   		var len = mediaFiles.length;
   		for (var i = 0; i < len; i++) {
   			path = mediaFiles[i].fullPath;
   			console.log('media full path = '+path, len);
   			readMedia(mediaFiles[0].name,audioNum);
   			}
   		};
   	// captureAudioError callback
   	var captureAudioError = function(error) {
   		alert('No audio was recorded. Try again?');
   		};
   	// start audio capture
   	navigator.device.capture.captureAudio(captureAudioSuccess, captureAudioError, audioOptions);
   	};
   
   ### Environment, Platform, Device
   <!-- In what environment, on what platform or on which device are you experiencing the issue? -->
   iPhone 6s, iPhone 7
   
   ### Version information
   <!-- 
   What are relevant versions you are using?
   For example:
   Cordova: Cordova CLI, Cordova Platforms, Cordova Plugins 
   Other Frameworks: Ionic Framework and CLI version
   Operating System, Android Studio, Xcode etc.
   -->
   cordova: 9.0.0 (cordova-lib@9.0.1)
   From my config.xml file: "cordova-plugin-media-capture" spec="^3.0.2" 
   
   
   ## Checklist
   <!-- Please check the boxes by putting an x in the [ ] like so: [x] -->
   
   - [x] I searched for existing GitHub issues
   - [x] I updated all Cordova tooling to most recent version
   - [x] I included all the necessary information above
   

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