1103571 - audio not play again using mediarecorder api by capturing at interval

Status: RESOLVED WONTFIX

(Firefox OS Graveyard :: General, defect)

Description

[feru]

User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:36.0) Gecko/20100101 Firefox/36.0
Build ID: 20141120030202

Steps to reproduce:

According to this link
https://hacks.mozilla.org/2014/06/easy-audio-capture-with-the-mediarecorder-api/

To start recording audio here used
     
     record.onclick = function() {
         mediaRecorder.start();

If i use

      mediaRecorder.start(2000); // 2sec interval

then it gives data in every 2 sec interval and following event triggered..

      mediaRecorder.ondataavailable = function(e) {
            var audioURL = window.URL.createObjectURL(e.data);
            audio.src = audioURL;
            audio.play();

this function will be called which give the audio data in blob (e.data) In this function audio src is set. audio.play() to play that 2 sec recorded audio data.




Actual results:

But it plays only first time . later there is data but data is not playing.. htmlg audio tag didn't play audio after that 1st time.


Expected results:

Expected result is audio will be played in every 2 sec interval here.

Is this a bug or i am missing something ?

Comment 1

[Randy Lin [:rlin] - Be Mozillian on 2015/01/26]

Hi feru, 
In mediaRecorder.ondataavailable = function(e), 
You should have a blob container to collect the blobs generated from media recorder. 
For example: 
var mBlob;
function dataavailablecb(aData) {
  if (mBlob) {
    mBlob = new Blob([mBlob, aData.data], {type: aData.data.type});
  } else {
    mBlob = new Blob([aData.data], {type: aData.data.type});
  }
}
Then you can play the audio sound in mBlob through audio tag.

You could refer this demo web site:
http://people.mozilla.org/~rlin/mr/gumaudio.html

Comment 2

[Randy Lin [:rlin] - Be Mozillian on 2015/01/26]

For opus format, the header would be in the first blob, you can't playback without this information, thanks.

Comment 3

[feru]

Hi Randy,
Thanks a lot for these informations. I want to capture audio for IP telephony. How can i capture in a format by setting bitrate, audio channel, mono stereo etc? And how to play a fragment of audio bytes? For this can you suggest me any website or project link where i can get help.

thanks

Comment 4

[BMO Automation]

Firefox OS is not being worked on