diff options
Diffstat (limited to 'DOCS/tech/vidix.txt')
| -rw-r--r-- | DOCS/tech/vidix.txt | 20 |
1 files changed, 10 insertions, 10 deletions
diff --git a/DOCS/tech/vidix.txt b/DOCS/tech/vidix.txt index f1f61ffe2c..71409be69d 100644 --- a/DOCS/tech/vidix.txt +++ b/DOCS/tech/vidix.txt @@ -1,6 +1,6 @@ VIDIX - VIDeo Interface for *niX ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - + This interface was designed and introduced as interface to userspace drivers to provide DGA everywhere where it's possible (unline X11). I hope that these drivers will be portable same as X11 (not only on *nix). @@ -12,10 +12,10 @@ What is it: - Unlikely linux's drivers it uses mathematics library. Why it was developed: -As said Vladimir Dergachev +As said Vladimir Dergachev (http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/gatos/km/km.rfc.txt): "0) Motivation - v4l, v4l2 and Xv are all suffering from the same problem: attempt to fit + v4l, v4l2 and Xv are all suffering from the same problem: attempt to fit existing multimedia devices into a fixed scheme." Well - I tried to implement something similar by motivation. @@ -42,7 +42,7 @@ So any suggestions, reports, criticism are gladly accepted. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vidix_playback_t.fourcc - contains fourcc of movie vidix_playback_t.capability - currently contsinas copy of vidix_capability_t.flags - vidix_playback_t.blend_factor- currently unused + vidix_playback_t.blend_factor- currently unused vidix_playback_t.src - x,y,w,h fields contain original movie size (in pixels) x and y often are nulls. vidix_playback_t.src.pitch.y These fields contain source pitches @@ -61,23 +61,23 @@ So any suggestions, reports, criticism are gladly accepted. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vidix_playback_t.num_frames - real # of frames which will be used by driver. (Should be less or equal to app's num_frames). - + vidix_playback_t.dest.pitch.y These fields should contain alignment vidix_playback_t.dest.pitch.u - for each Y,U,V plane in bytes. vidix_playback_t.dest.pitch.v (For packed fourcc only Y value is used) - + vidix_playback_t.frame_size - Driver should tell to app which size of source frame (src.w and src.h) should use APP (according to pitches and offsets) vidix_playback_t.offsets - offsets from begin of BES memory for each frame - + vidix_playback_t.offset.y These field should contain offset vidix_playback_t.offset.u - for each Y,U,V plane within frame. vidix_playback_t.offset.v (For packed fourcc only Y value is used) vidix_playback_t.dga_addr - Address of BES memory. - + Also see this picture: VIDEO MEMORY layout: @@ -128,8 +128,8 @@ Formula: (For Y plane) copy source to: 10) APP calls vixPlaybackOff. Driver should deactivate BES on this call. 11) If vixDestroy is defined APP calls this function before unloading driver from memory. - - + + What functions are mandatory: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vixGetVersion |