[FFmpeg-devel] [PATCH 2/7] avio: deprecate url_is_streamed

[Tomas Härdin]

Michael Niedermayer skrev 2011-03-08 12:28:
> On Mon, Mar 07, 2011 at 10:24:21AM -0500, Ronald S. Bultje wrote:
>> Hi,
>>
>> On Sun, Mar 6, 2011 at 12:04 PM, Anton Khirnov<anton at khirnov.net>  wrote:
>>> AVIOContext.is_streamed field should be used directly instead.
>>
>> Since we're talking about API cleanup anyway. What is this function?
>>
>> A "stream" isn't a very useful concept. Why do demuxers want to know
>> whether the input is a stream? They more likely want to know whether
>> the input is seekable (like HTTP/1.1 with RangeRequest vs. HTTP/1.0 or
>> a pipe/fifo), or whether seeking - if supported at all - is slow (like
>> HTTP/1.1 with RangeRequest vs. a local seekable file). I see it used
>> in a variety of different demuxers with a different implied meaning
>> (seeking is slow vs. seeking is unsupported), and that is bad.
>
> change it to:
> seekable=0 //no seeking
> seekable=1 //slow seeking
> seekable=2 //fast seeking
> enum could be used

You could possibly add "can't SEEK_END" to that list. One example of 
that would be a growing HTTP resource (like pointing to a file being 
uploaded), where you can seek anywhere but past the current end of the 
stream/file.

/Tomas