1 /*****************************************************************************
2 * qcom.c : pixel format translation for Qualcomm tiled nv12
3 *****************************************************************************
4 * Copyright © 2012 Rafaël Carré
6 * Authors: Rafaël Carré <funman@videolanorg>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU Lesser General Public License as published by
10 * the Free Software Foundation; either version 2.1 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public License
19 * along with this program; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
21 *****************************************************************************/
27 #include <vlc_picture.h>
36 * The format is called QOMX_COLOR_FormatYUV420PackedSemiPlanar64x32Tile2m8ka.
37 * First wtf: why call it YUV420? It is NV12 (interleaved U&V).
38 * Second wtf: why this format at all?
41 #define TILE_HEIGHT 32
42 #define TILE_SIZE (TILE_WIDTH * TILE_HEIGHT)
44 /* get frame tile coordinate. XXX: nothing to be understood here, don't try. */
45 static size_t tile_pos(size_t x, size_t y, size_t w, size_t h)
47 size_t flim = x + (y & ~1) * w;
51 } else if ((h & 1) == 0 || y != (h - 1)) {
58 void qcom_convert(const uint8_t *src, picture_t *pic)
60 size_t width = pic->format.i_width;
61 size_t pitch = pic->p[0].i_pitch;
62 size_t height = pic->format.i_height;
64 const size_t tile_w = (width - 1) / TILE_WIDTH + 1;
65 const size_t tile_w_align = (tile_w + 1) & ~1;
67 const size_t tile_h_luma = (height - 1) / TILE_HEIGHT + 1;
68 const size_t tile_h_chroma = (height / 2 - 1) / TILE_HEIGHT + 1;
70 size_t luma_size = tile_w_align * tile_h_luma * TILE_SIZE;
72 #define TILE_GROUP_SIZE (4 * TILE_SIZE)
73 if((luma_size % TILE_GROUP_SIZE) != 0)
74 luma_size = (((luma_size - 1) / TILE_GROUP_SIZE) + 1) * TILE_GROUP_SIZE;
76 for(size_t y = 0; y < tile_h_luma; y++) {
77 size_t row_width = width;
78 for(size_t x = 0; x < tile_w; x++) {
79 /* luma source pointer for this tile */
80 const uint8_t *src_luma = src
81 + tile_pos(x, y,tile_w_align, tile_h_luma) * TILE_SIZE;
83 /* chroma source pointer for this tile */
84 const uint8_t *src_chroma = src + luma_size
85 + tile_pos(x, y/2, tile_w_align, tile_h_chroma) * TILE_SIZE;
87 src_chroma += TILE_SIZE/2;
89 /* account for right columns */
90 size_t tile_width = row_width;
91 if (tile_width > TILE_WIDTH)
92 tile_width = TILE_WIDTH;
94 /* account for bottom rows */
95 size_t tile_height = height;
96 if (tile_height > TILE_HEIGHT)
97 tile_height = TILE_HEIGHT;
99 /* dest luma memory index for this tile */
100 size_t luma_idx = y * TILE_HEIGHT * pitch + x * TILE_WIDTH;
102 /* dest chroma memory index for this tile */
103 /* XXX: remove divisions */
104 size_t chroma_idx = (luma_idx / pitch) * pitch/2 + (luma_idx % pitch);
106 tile_height /= 2; // we copy 2 luma lines at once
107 while (tile_height--) {
108 memcpy(&pic->p[0].p_pixels[luma_idx], src_luma, tile_width);
109 src_luma += TILE_WIDTH;
112 memcpy(&pic->p[0].p_pixels[luma_idx], src_luma, tile_width);
113 src_luma += TILE_WIDTH;
116 memcpy(&pic->p[1].p_pixels[chroma_idx], src_chroma, tile_width);
117 src_chroma += TILE_WIDTH;
120 row_width -= TILE_WIDTH;
122 height -= TILE_HEIGHT;