[whatwg] default audio upload format (was Fwd: The Media Capture API Working Draft)
jsalsman at gmail.com
Wed Sep 1 08:21:31 PDT 2010
On Tue, Aug 31, 2010 at 11:24 PM, Roger Hågensen <rescator at emsai.net> wrote:
> On 2010-08-31 22:11, James Salsman wrote:
>> Does anyone object to form input type=file
>> accept="audio/*;capture=microphone" using Speex as a default, as if it
>> were specified
>> accept="audio/x-speex;quality=7;bitrate=16000;capture=microphone" or
>> to allowing the requesting of different speex qualities and bitrates
>> using those mime type parameters?
>> Speex at quality=7 is a reasonable open source default audio vocoder.
>> Runner-up alternatives would include audio/ogg, which is a higher
>> bandwidth format appropriate for multiple speakers or polyphonic
>> music; audio/mpeg, a popular but encumbered format; audio/wav, a union
>> of several different sound file formats, some of which are encumbered;
> Actually, wouldn't accept="audio/*;capture=microphone"
> basically indicate that the server wish to accept anything as audio?
Yes; that doesn't encourage implementors to implement. However, as it
was agreed on by two different browser developer representatives, it's
the best way forward.
> The proper way however would be to do:
> accept="audio/flac, audio/wav, audio/ogg, audio/aac,
> indicating all the audio formats the server can handle.
I agree that the specifications should allow a comma- or
space-separated list of MIME types. I have no idea why that was
specifically disallowed in the most recent HTML5 specification, and
think that decision should be reversed before publication. I also
think "capture" would work a lot better as an attribute of the input
type=file element than a MIME type parameter.
> Although I guess that audio/* could be taken as a sign that the browser
> should negotiate directly with the server about the preferred format to use.
> (Is POST HEADER request supported even?)
Not for multipart/form-encoded input type=file uploads, sadly. There's
a way to do that specified in http://w3.org/TR/device-upload with the
"alternates" form POST parameter which the browser would send back to
the server when the requested type(s) were unavailable. I guess that
is a content negotiation feature, but it seemed unlikely that people
would need it for that because ideally the server would specify all
the types it could accept, as you pointed out.
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