Exploring the use of MediaSource for seamless audio playback

Currently working on integrating an audio player into my Angular web application by following a tutorial from Google Developers and seeking guidance from a thread on Can't seek video when playing from MediaSource.

The unique aspect of my implementation is that I aim to stream audio in small chunks so users can listen without having to download the entire file initially.

The functionality of starting playback from the beginning using byte-chunks appended to SourceBuffer upon arrival is already functional.

However, I am encountering difficulties with implementing the "seek" feature.

I'm unsure about handling this on the client side, specifically for mp3 files. Information on how the seeking event works has been elusive.

It's known that setting the currentTime of an audio element triggers a seeking event based on the Media Events documentation.

this.audioObj = document.createElement('audio');

and also including a setter:

public seekTo(seconds) {
  this.logger.debug(`seekTo ${seconds.toFixed(2)} seconds`);
  // Setting currentTime will cause a "seeking" event to be emitted.
  this.audioObj.currentTime = seconds;
}

My understanding suggests that new data must be loaded before setting currentTime and appending it to the sourceBuffer, although this approach seems flawed.

Seeking advice on making this function as intended.

Answer №1

When setting the duration, you should also be able to set the currentTime for your media element. However, if nothing is currently playing, there may not be any visible effect. Utilize the currentTime property to guide your chunk fetcher in identifying and appending the required portion of the file so that playback can continue seamlessly.

It's worth noting that when working with mp3 files, the SourceBuffer will function in 'sequence' mode due to the absence of timestamps. This means that simply appending bytes without consideration may lead to them being out of sync with the desired timing - setting the 'timestampOffset' to the appropriate time for the specific frame could potentially resolve this issue (although I have yet to personally test this method).

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