Re: Progressive audio data decoding

On Tue, Jan 15, 2013 at 12:57 PM, Yury Delendik <ydelendik@mozilla.com>wrote:

>  On 1/15/2013 2:42 PM, Chris Rogers wrote:
>
>
>
> On Tue, Jan 15, 2013 at 10:45 AM, Yury Delendik <ydelendik@mozilla.com>wrote:
>
>>  On 1/15/2013 12:27 PM, Ralph Giles wrote:
>>
>>> On 13-01-15 5:55 AM, Yury Delendik wrote:
>>>
>>>> Hello,
>>>>
>>>> Is there a way to decode the audio data in chunks?
>>>>
>>> I don't know about WebAudio, but are you aware of the MediaSource draft?
>>> It proposes something like this.
>>>
>>>
>>> https://dvcs.w3.org/hg/html-media/raw-file/tip/media-source/media-source.html
>>>
>>>   -r
>>>
>>>   Thank you. That's closer to what I'm looking for.
>>
>> But to be on a par with flash or implement some fancy audio player, some
>> basic sound transform may be applied to the audio (e.g. [1]). Also, it will
>> be useful to extract the sound data from the encoded audio [2] or compute
>> spectrum [3].
>>
>>   [1]
>> http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/media/SoundTransform.html
>>   [2]
>> http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/media/Sound.html#extract%28%29
>>   [3]
>> http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/media/SoundMixer.html#computeSpectrum%28%29
>
>
>  There is the MediaElementAudioSourceNode to let you apply effects or
> visualize from an <audio> element:
>
> https://dvcs.w3.org/hg/audio/raw-file/tip/webaudio/specification.html#MediaElementAudioSourceNode
>
>
>  I don't quite understand the complete solution. Do you suggest to use
> Media Source Extensions to build the stream, play the audio element with
> normal speed, get the data using the MediaElementAudioSourceNode, apply
> effects and playback the final audio using Web Audio? I think it's a little
> bit inefficient.
>

Aren't you talking about doing exactly the same processing, but via a
different proposed API.  I'm not sure I understand why it would be less
efficient.