Audio streaming on details popup

[stlim0730]

Some survey data has audio recordings by the respondents. It'll be good to have audio playback feature for it.

One expected issue is the file type. As the respondents use different platforms to submit the survey, recordings might have different formats. Some formats might not be even supported by modern web browsers.

I'm assigning this task to myself.

[stlim0730]

For note:

Audio file types supported in web browsers
http://caniuse.com/#search=audio

MDN documentation about HTML5 audio
https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/Using_HTML5_audio_and_video

[stlim0730]

I tested my code with 3gpp audio files, but didn't work. We decided to download and preprocess all the media resources in the meeting on June 27.

Two major issues are: hyperlinkable online storage for the media files and streamlining (automated processing).

[stlim0730]

The team decided to use Dropbox as the media storage for two reasons: REST API and hyperlink reference support. Also, the media file should be converted into web-friendly format, such as mp3 or ogg, during the existing data streamline.

I put off this task until apiprocess branch is merged.