Re: Progressive audio data decoding

To be clear:  The <audio> element streams the data from the network,
playing it at normal speed - MediaElementAudioSourceNode is how you grab
the output of that and apply effects to it (before sending it to the
"speakers").


On Tue, Jan 15, 2013 at 2:48 PM, Chris Rogers <crogers@google.com> wrote:

>
>
> 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.
>
>
>