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video: add support for max-framerate

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Add support for max-framerate in the video helpers and update the video
caps document.
This commit is contained in:
Wim Taymans 2011-11-11 13:14:21 +01:00
parent 6781587784
commit 06a6ab3e32
3 changed files with 31 additions and 8 deletions
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4
docs/design/draft-media-types.txt
View file

@ -12,6 +12,10 @@ Media Types
framerate, GST_TYPE_FRACTION, default 0/1
The framerate of the video 0/1 for variable framerate
max-framerate, GST_TYPE_FRACTION, default as framerate
For variable framerates this would be the maximum framerate that
is expected. This value is only valid when the framerate is 0/1
pixel-aspect-ratio, GST_TYPE_FRACTION, default 1/1
The pixel aspect ration of the video

18
gst-libs/gst/video/video.c
View file

@ -826,9 +826,16 @@ gst_video_info_from_caps (GstVideoInfo * info, const GstCaps * caps)
gst_video_info_set_format (info, format, width, height);
if (gst_structure_get_fraction (structure, "framerate", &fps_n, &fps_d)) {
if (fps_n == 0) {
/* variable framerate */
info->flags |= GST_VIDEO_FLAG_VARIABLE_FPS;
/* see if we have a max-framerate */
gst_structure_get_fraction (structure, "max-framerate", &fps_n, &fps_d);
}
info->fps_n = fps_n;
info->fps_d = fps_d;
} else {
/* unspecified is variable framerate */
info->fps_n = 0;
info->fps_d = 1;
}
@ -915,7 +922,6 @@ gst_video_info_to_caps (GstVideoInfo * info)
"format", G_TYPE_STRING, format,
"width", G_TYPE_INT, info->width,
"height", G_TYPE_INT, info->height,
"framerate", GST_TYPE_FRACTION, info->fps_n, info->fps_d,
"pixel-aspect-ratio", GST_TYPE_FRACTION, info->par_n, info->par_d, NULL);
if (info->flags & GST_VIDEO_FLAG_INTERLACED)
@ -930,6 +936,16 @@ gst_video_info_to_caps (GstVideoInfo * info)
if (info->views > 1)
gst_caps_set_simple (caps, "views", G_TYPE_INT, info->views, NULL);
if (info->flags & GST_VIDEO_FLAG_VARIABLE_FPS && info->fps_n != 0) {
/* variable fps with a max-framerate */
gst_caps_set_simple (caps, "framerate", GST_TYPE_FRACTION, 0, 1,
"max-framerate", GST_TYPE_FRACTION, info->fps_n, info->fps_d, NULL);
} else {
/* no variable fps or no max-framerate */
gst_caps_set_simple (caps, "framerate", GST_TYPE_FRACTION,
info->fps_n, info->fps_d, NULL);
}
return caps;
}

5
gst-libs/gst/video/video.h
View file

@ -312,6 +312,8 @@ typedef struct _GstVideoFrame GstVideoFrame;
* @GST_VIDEO_FLAG_ONEFIELD: one field
* @GST_VIDEO_FLAG_TELECINE: telecine
* @GST_VIDEO_FLAG_PROGRESSIVE: video is progressive
* @GST_VIDEO_FLAG_VARIABLE_FPS: a variable fps is selected, fps_n and fps_d
* denote the maximum fps of the video
*
* Extra video flags
*/
@ -322,7 +324,8 @@ typedef enum {
GST_VIDEO_FLAG_RFF = (1 << 2),
GST_VIDEO_FLAG_ONEFIELD = (1 << 3),
GST_VIDEO_FLAG_TELECINE = (1 << 4),
GST_VIDEO_FLAG_PROGRESSIVE = (1 << 5)
GST_VIDEO_FLAG_PROGRESSIVE = (1 << 5),
GST_VIDEO_FLAG_VARIABLE_FPS = (1 << 6)
} GstVideoFlags;
/**