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video-tile: add tile mode and helper functions
Move the tile helper functions to their own file. Make it possible to make other tiling modes later. https://bugzilla.gnome.org/show_bug.cgi?id=707361
This commit is contained in:
Wim Taymans
Nicolas Dufresne
parent
f8d3b9b4fc
commit
3ceb7dfe22
4 changed files with 197 additions and 92 deletions
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@ -27,6 +27,7 @@ libgstvideo_@GST_API_VERSION@_la_SOURCES = \
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video-color.c \
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video-info.c \
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video-frame.c \
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video-tile.c \
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gstvideosink.c \
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gstvideofilter.c \
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convertframe.c \
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@ -54,6 +55,7 @@ libgstvideo_@GST_API_VERSION@include_HEADERS = \
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video-color.h \
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video-info.h \
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video-frame.h \
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video-tile.h \
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gstvideosink.h \
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gstvideofilter.h \
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gstvideometa.h \
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@ -27,6 +27,7 @@
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#include <stdio.h>
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#include "video-format.h"
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#include "video-tile.h"
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/**
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* SECTION:gstvideo
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@ -2082,98 +2083,6 @@ pack_I422_10BE (const GstVideoFormatInfo * info, GstVideoPackFlags flags,
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}
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}
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/**
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* GstVideoTileMode:
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* @GST_VIDEO_TILE_MODE_UNKNOWN: Unknown or unset video format id
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* @GST_VIDEO_TILE_MODE_ZFLIPZ_2X2: Every four adjacent buffers - two
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* horizontally and two vertically are grouped together and are located
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* in memory in Z or flipped Z order.
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*
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* Enum value describing the most common video formats.
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*/
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typedef enum
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{
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GST_VIDEO_TILE_MODE_NONE,
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GST_VIDEO_TILE_MODE_ZFLIPZ_2X2,
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} GstVideoTileMode;
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/**
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* gst_video_tile_get_index:
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* @mode: a #GstVideoTileMode
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* @x: x coordinate
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* @y: y coordinate
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* @x_tiles: number of horizintal tiles
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* @y_tiles: number of vertical tiles
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*
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* Get the tile index of the tile at coordinates @x and @y.
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*
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* Returns: the index of the tile at @x and @y in the tiled image of
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* @x_tiles by @y_tiles.
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*/
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static gsize
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gst_video_tile_get_index (GstVideoTileMode mode, gint x, gint y,
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gint x_tiles, gint y_tiles)
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{
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gsize offset;
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switch (mode) {
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case GST_VIDEO_TILE_MODE_ZFLIPZ_2X2:
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/* Due to the zigzag pattern we know that tiles are numbered like:
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* (see http://linuxtv.org/downloads/v4l-dvb-apis/re31.html)
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*
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* | Column (x)
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* | 0 1 2 3 4 5 6 7
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* -------|---------------------------------------
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* 0 | 0 1 6 7 8 9 14 15
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* R 1 | 2 3 4 5 10 11 12 13
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* o 2 | 16 17 22 23 24 25 30 31
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* w 3 | 18 19 20 21 26 27 28 29
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* 4 | 32 33 38 39 40 41 46 47
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* (y) 5 | 34 35 36 37 42 43 44 45
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* 6 | 48 49 50 51 52 53 54 55
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*
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* From this we can see that:
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*
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* For even rows:
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* - The first block in a row is always mapped to memory block 'y * width'.
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* - For all even rows, except for the last one when 'y' is odd, from the first
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* block number an offset is then added to obtain the block number for
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* the other blocks in the row. The offset is 'x' plus the corresponding
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* number in the series [0, 0, 4, 4, 4, 4, 8, 8, 8, 8, 12, ...], which can be
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* expressed as 'GST_ROUND_DOWN_4 (x + 2)'.
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* f(x,y,width,height) = y * width + x + GST_ROUND_DOWN_4 (x + 2)
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*
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* - For the last row when 'y' is odd the offset is simply 'x'.
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* f(x,y,width,height) = y * width + x
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* - Note that 'y' is even, so 'GST_ROUNDOWN_2 (y) == y' in this case
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*
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* For odd rows:
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* - The first block in the row is always mapped to memory block
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* 'GST_ROUND_DOWN_2(y) * width + 2'.
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* - From the first block number an offset is then added to obtain the block
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* number for the other blocks in the row. The offset is 'x' plus the
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* corresponding number in the series [0, 0, 0, 0, 4, 4, 4, 4, 8, 8, 8, 8, 12, ...],
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* which can be expressed as GST_ROUND_DOWN_4 (x).
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* f(x,y,width,height) = GST_ROUND_DOWN_2 (y) * width + bx 2 + GST_ROUND_DOWN_4 (x)
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*/
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/* Common to all cases */
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offset = GST_ROUND_DOWN_2 (y) * x_tiles + x;
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if (y & 1) {
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/* For odd row */
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offset += 2 + GST_ROUND_DOWN_4 (x);
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} else if ((y_tiles & 1) == 0 || y != (y_tiles - 1)) {
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/* For even row except for the last row when odd height */
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offset += GST_ROUND_DOWN_4 (x + 2);
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}
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break;
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default:
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offset = 0;
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break;
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}
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return offset;
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}
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static void
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get_tile_NV12 (gint tile_width, gint tile_height, gint tile_size, gint tx,
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gint ty, gint x_tiles, gint y_tiles,
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102
gst-libs/gst/video/video-tile.c
Normal file
102
gst-libs/gst/video/video-tile.c
Normal file
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@ -0,0 +1,102 @@
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/* GStreamer
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* Copyright (C) <2013> Wim Taymans <wim.taymans@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include <gst/video/video-tile.h>
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/**
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* gst_video_tile_get_index:
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* @mode: a #GstVideoTileMode
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* @x: x coordinate
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* @y: y coordinate
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* @x_tiles: number of horizintal tiles
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* @y_tiles: number of vertical tiles
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*
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* Get the tile index of the tile at coordinates @x and @y in the tiled
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* image of @x_tiles by @y_tiles.
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*
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* Use this method when @mode is of type #GST_VIDEO_TILE_MODE_INDEXED.
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*
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* Returns: the index of the tile at @x and @y in the tiled image of
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* @x_tiles by @y_tiles.
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*/
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guint
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gst_video_tile_get_index (GstVideoTileMode mode, gint x, gint y,
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gint x_tiles, gint y_tiles)
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{
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gsize offset;
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g_return_val_if_fail (GST_VIDEO_TILE_MODE_IS_INDEXED (mode), 0);
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switch (mode) {
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case GST_VIDEO_TILE_MODE_ZFLIPZ_2X2:
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/* Due to the zigzag pattern we know that tiles are numbered like:
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* (see http://linuxtv.org/downloads/v4l-dvb-apis/re31.html)
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*
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* | Column (x)
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* | 0 1 2 3 4 5 6 7
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* -------|---------------------------------------
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* 0 | 0 1 6 7 8 9 14 15
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* R 1 | 2 3 4 5 10 11 12 13
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* o 2 | 16 17 22 23 24 25 30 31
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* w 3 | 18 19 20 21 26 27 28 29
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* 4 | 32 33 38 39 40 41 46 47
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* (y) 5 | 34 35 36 37 42 43 44 45
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* 6 | 48 49 50 51 52 53 54 55
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*
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* From this we can see that:
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*
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* For even rows:
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* - The first block in a row is always mapped to memory block 'y * width'.
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* - For all even rows, except for the last one when 'y' is odd, from the first
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* block number an offset is then added to obtain the block number for
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* the other blocks in the row. The offset is 'x' plus the corresponding
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* number in the series [0, 0, 4, 4, 4, 4, 8, 8, 8, 8, 12, ...], which can be
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* expressed as 'GST_ROUND_DOWN_4 (x + 2)'.
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* f(x,y,width,height) = y * width + x + GST_ROUND_DOWN_4 (x + 2)
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*
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* - For the last row when 'y' is odd the offset is simply 'x'.
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* f(x,y,width,height) = y * width + x
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* - Note that 'y' is even, so 'GST_ROUNDOWN_2 (y) == y' in this case
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*
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* For odd rows:
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* - The first block in the row is always mapped to memory block
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* 'GST_ROUND_DOWN_2(y) * width + 2'.
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* - From the first block number an offset is then added to obtain the block
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* number for the other blocks in the row. The offset is 'x' plus the
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* corresponding number in the series [0, 0, 0, 0, 4, 4, 4, 4, 8, 8, 8, 8, 12, ...],
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* which can be expressed as GST_ROUND_DOWN_4 (x).
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* f(x,y,width,height) = GST_ROUND_DOWN_2 (y) * width + bx 2 + GST_ROUND_DOWN_4 (x)
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*/
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/* Common to all cases */
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offset = GST_ROUND_DOWN_2 (y) * x_tiles + x;
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if (y & 1) {
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/* For odd row */
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offset += 2 + GST_ROUND_DOWN_4 (x);
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} else if ((y_tiles & 1) == 0 || y != (y_tiles - 1)) {
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/* For even row except for the last row when odd height */
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offset += GST_ROUND_DOWN_4 (x + 2);
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}
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break;
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default:
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offset = 0;
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break;
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}
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return offset;
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}
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92
gst-libs/gst/video/video-tile.h
Normal file
92
gst-libs/gst/video/video-tile.h
Normal file
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@ -0,0 +1,92 @@
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/* GStreamer
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* Copyright (C) <2013> Wim Taymans <wim.taymans@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __GST_VIDEO_TILE_H__
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#define __GST_VIDEO_TILE_H__
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#include <gst/gst.h>
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#include <gst/video/video-format.h>
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G_BEGIN_DECLS
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/**
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* GstVideoTileType:
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* @GST_VIDEO_TILE_TYPE_INDEXED: Tiles are indexed. Use
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* gst_video_tile_get_index () to retrieve the tile at the requested
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* coordinates.
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*
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* Enum value describing the most common tiling types.
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*/
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typedef enum
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{
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GST_VIDEO_TILE_TYPE_INDEXED = 0
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} GstVideoTileType;
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#define GST_VIDEO_TILE_TYPE_SHIFT (16)
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#define GST_VIDEO_TILE_TYPE_MASK ((1 << GST_VIDEO_TILE_TYPE_SHIFT) - 1)
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/**
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* GST_VIDEO_TILE_MAKE_MODE:
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* @num: the mode number to create
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* @type: the tile mode type
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*
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* use this macro to create new tile modes.
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*/
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#define GST_VIDEO_TILE_MAKE_MODE(num, type) \
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(((num) << GST_VIDEO_TILE_TYPE_SHIFT) | (GST_VIDEO_TILE_TYPE_ ##type))
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/**
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* GST_VIDEO_TILE_MODE_TYPE:
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* @mode: the tile mode
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*
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* Get the tile mode type of @mode
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*/
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#define GST_VIDEO_TILE_MODE_TYPE(mode) ((mode) & GST_VIDEO_TILE_TYPE_MASK)
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/**
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* GST_VIDEO_TILE_MODE_IS_INDEXED:
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* @mode: a tile mode
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*
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* Check if @mode is an indexed tile type
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*/
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#define GST_VIDEO_TILE_MODE_IS_INDEXED(mode) (GST_VIDEO_TILE_MODE_TYPE(mode) == GST_VIDEO_TILE_TYPE_INDEXED)
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/**
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* GstVideoTileMode:
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* @GST_VIDEO_TILE_MODE_UNKNOWN: Unknown or unset tile mode
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* @GST_VIDEO_TILE_MODE_ZFLIPZ_2X2: Every four adjacent buffers - two
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* horizontally and two vertically are grouped together and are located
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* in memory in Z or flipped Z order.
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*
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* Enum value describing the available tiling modes.
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*/
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typedef enum
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{
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GST_VIDEO_TILE_MODE_UNKNOWN = 0,
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GST_VIDEO_TILE_MODE_ZFLIPZ_2X2 = GST_VIDEO_TILE_MAKE_MODE (1, INDEXED),
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} GstVideoTileMode;
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guint gst_video_tile_get_index (GstVideoTileMode mode, gint x, gint y,
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gint x_tiles, gint y_tiles);
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G_END_DECLS
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#endif /* __GST_VIDEO_TILE_H__ */
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