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docs: add docs for some of the video info macros

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Tim-Philipp Müller 2012-08-24 17:21:58 +01:00
parent a994ebcf1b
commit 7970a0ac71
1 changed files with 39 additions and 1 deletions
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40
gst-libs/gst/video/video-format.h
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@ -288,7 +288,8 @@ typedef void (*GstVideoFormatPack) (const GstVideoFormatInfo *info,
* @depth: the depth in bits for each component
* @pixel_stride: the pixel stride of each component. This is the amount of
* bytes to the pixel immediately to the right. When bits < 8, the stride is
* expressed in bits.
* expressed in bits. For 24-bit RGB, this would be 3 bytes, for example,
* while it would be 4 bytes for RGBx or ARGB.
* @n_planes: the number of planes for this format. The number of planes can be
* less than the amount of components when multiple components are packed into
* one plane.
@ -347,8 +348,37 @@ struct _GstVideoFormatInfo {
#define GST_VIDEO_FORMAT_INFO_N_COMPONENTS(info) ((info)->n_components)
#define GST_VIDEO_FORMAT_INFO_SHIFT(info,c) ((info)->shift[c])
#define GST_VIDEO_FORMAT_INFO_DEPTH(info,c) ((info)->depth[c])
/**
* GST_VIDEO_FORMAT_INFO_PSTRIDE:
*
* pixel stride for the given component. This is the amount of bytes to the
* pixel immediately to the right, so basically bytes from one pixel to the
* next. When bits < 8, the stride is expressed in bits.
*
* Examples: for 24-bit RGB, the pixel stride would be 3 bytes, while it
* would be 4 bytes for RGBx or ARGB, and 8 bytes for ARGB64 or AYUV64.
* For planar formats such as I420 the pixel stride is usually 1. For
* YUY2 it would be 2 bytes.
*/
#define GST_VIDEO_FORMAT_INFO_PSTRIDE(info,c) ((info)->pixel_stride[c])
/**
* GST_VIDEO_FORMAT_INFO_N_PLANES:
*
* Number of planes. This is the number of planes the pixel layout is
* organized in in memory. The number of planes can be less than the
* number of components (e.g. Y,U,V,A or R, G, B, A) when multiple
* components are packed into one plane.
*
* Examples: RGB/RGBx/RGBA: 1 plane, 3/3/4 components;
* I420: 3 planes, 3 components; NV21/NV12: 2 planes, 3 components.
*/
#define GST_VIDEO_FORMAT_INFO_N_PLANES(info) ((info)->n_planes)
/**
* GST_VIDEO_FORMAT_INFO_PLANE:
*
* Plane number where the given component can be found. A plane may
* contain data for multiple components.
*/
#define GST_VIDEO_FORMAT_INFO_PLANE(info,c) ((info)->plane[c])
#define GST_VIDEO_FORMAT_INFO_POFFSET(info,c) ((info)->poffset[c])
#define GST_VIDEO_FORMAT_INFO_W_SUB(info,c) ((info)->w_sub[c])
@ -362,6 +392,14 @@ struct _GstVideoFormatInfo {
#define GST_VIDEO_FORMAT_INFO_DATA(info,planes,comp) \
(((guint8*)(planes)[(info)->plane[comp]]) + (info)->poffset[comp])
/**
* GST_VIDEO_FORMAT_INFO_STRIDE:
*
* Row stride in bytes, that is number of bytes from the first pixel component
* of a row to the first pixel component in the next row. This might include
* some row padding (memory not actually used for anything, to make sure the
* beginning of the next row is aligned in a particular way).
*/
#define GST_VIDEO_FORMAT_INFO_STRIDE(info,strides,comp) ((strides)[(info)->plane[comp]])
#define GST_VIDEO_FORMAT_INFO_OFFSET(info,offsets,comp) \
(((offsets)[(info)->plane[comp]]) + (info)->poffset[comp])