On Tue, Feb 12, 2008 at 05:47:13PM +0100, Alban Bedel wrote:
On Tue, 12 Feb 2008 16:00:10 +0100 (CET) michael <subversion@mplayerhq.hu> wrote:
Modified: docs/nutissues.txt ============================================================================== --- docs/nutissues.txt (original) +++ docs/nutissues.txt Tue Feb 12 16:00:09 2008 @@ -162,3 +162,8 @@ How do we identify the interleaving A. fourcc B. extradata
I would vote for this with a single fourcc for pcm and a single fourcc for raw video. Having infos about the data format packed in the fourcc is ugly and useless. That just lead to inflexible lookup tables and the like.
Instead we should just define the format in a way similar to what mp_image provide for video (colorspace, packed or not, shift used for the subsampled planes, etc). That would allow implementations simply supporting all definable format, instead of a selection of what happened to be commonly used formats at the time the implementation was written.
The key points here are that * colorspace/shift for subsampled planes, etc is not specific to RAW, its more like sample_rate or width/height * non raw codecs have clearly defined global headers (sometimes at least) -> thus we cant really use extradata for it extradata would only be ok for things we definitly dont ever need for non raw
C. New field in the stream header +D. Only allow 1 standard interleaving + +What about the interleaving of non raw codecs, do all specify the +interleaving, or does any leave it to the container? If so, our options +would be down to only C.
On a related subject, it might also be useful to define the channel disposition when there is more than one. Mono and stereo can go by with the classical default, but as soon as there is more channels it is really unclear. And imho such info could still be usefull with 1 or 2 channels. Something like the position of each channel in polar coordinate (2D or 3D?) should be enouth.
I agree What about that LFE channel thing? And where do we put this info, The stream header seems the logic place if you ask me ... [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Democracy is the form of government in which you can choose your dictator