2 * Copyright (c) 2007 Benoit Fouet
3 * Copyright (c) 2010 Stefano Sabatini
5 * This file is part of Libav.
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * horizontal flip filter
30 #include "libavutil/pixdesc.h"
31 #include "libavutil/intreadwrite.h"
32 #include "libavutil/imgutils.h"
35 int max_step[4]; ///< max pixel step for each plane, expressed as a number of bytes
36 int hsub, vsub; ///< chroma subsampling
39 static int query_formats(AVFilterContext *ctx)
41 static const enum PixelFormat pix_fmts[] = {
42 PIX_FMT_RGB48BE, PIX_FMT_RGB48LE,
43 PIX_FMT_BGR48BE, PIX_FMT_BGR48LE,
44 PIX_FMT_ARGB, PIX_FMT_RGBA,
45 PIX_FMT_ABGR, PIX_FMT_BGRA,
46 PIX_FMT_RGB24, PIX_FMT_BGR24,
47 PIX_FMT_RGB565BE, PIX_FMT_RGB565LE,
48 PIX_FMT_RGB555BE, PIX_FMT_RGB555LE,
49 PIX_FMT_BGR565BE, PIX_FMT_BGR565LE,
50 PIX_FMT_BGR555BE, PIX_FMT_BGR555LE,
51 PIX_FMT_GRAY16BE, PIX_FMT_GRAY16LE,
52 PIX_FMT_YUV420P16LE, PIX_FMT_YUV420P16BE,
53 PIX_FMT_YUV422P16LE, PIX_FMT_YUV422P16BE,
54 PIX_FMT_YUV444P16LE, PIX_FMT_YUV444P16BE,
55 PIX_FMT_YUV444P, PIX_FMT_YUV422P,
56 PIX_FMT_YUV420P, PIX_FMT_YUV411P,
57 PIX_FMT_YUV410P, PIX_FMT_YUV440P,
58 PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P,
59 PIX_FMT_YUVJ420P, PIX_FMT_YUVJ440P,
61 PIX_FMT_RGB8, PIX_FMT_BGR8,
62 PIX_FMT_RGB4_BYTE, PIX_FMT_BGR4_BYTE,
63 PIX_FMT_PAL8, PIX_FMT_GRAY8,
67 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
71 static int config_props(AVFilterLink *inlink)
73 FlipContext *flip = inlink->dst->priv;
74 const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
76 av_image_fill_max_pixsteps(flip->max_step, NULL, pix_desc);
77 flip->hsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_w;
78 flip->vsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_h;
83 static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
85 FlipContext *flip = inlink->dst->priv;
86 AVFilterBufferRef *inpic = inlink->cur_buf;
87 AVFilterBufferRef *outpic = inlink->dst->outputs[0]->out_buf;
88 uint8_t *inrow, *outrow;
89 int i, j, plane, step, hsub, vsub;
91 for (plane = 0; plane < 4 && inpic->data[plane]; plane++) {
92 step = flip->max_step[plane];
93 hsub = (plane == 1 || plane == 2) ? flip->hsub : 0;
94 vsub = (plane == 1 || plane == 2) ? flip->vsub : 0;
96 outrow = outpic->data[plane] + (y>>vsub) * outpic->linesize[plane];
97 inrow = inpic ->data[plane] + (y>>vsub) * inpic ->linesize[plane] + ((inlink->w >> hsub) - 1) * step;
98 for (i = 0; i < h>>vsub; i++) {
101 for (j = 0; j < (inlink->w >> hsub); j++)
102 outrow[j] = inrow[-j];
107 uint16_t *outrow16 = (uint16_t *)outrow;
108 uint16_t * inrow16 = (uint16_t *) inrow;
109 for (j = 0; j < (inlink->w >> hsub); j++)
110 outrow16[j] = inrow16[-j];
117 uint8_t *out = outrow;
118 for (j = 0; j < (inlink->w >> hsub); j++, out += 3, in -= 3) {
119 int32_t v = AV_RB24(in);
127 uint32_t *outrow32 = (uint32_t *)outrow;
128 uint32_t * inrow32 = (uint32_t *) inrow;
129 for (j = 0; j < (inlink->w >> hsub); j++)
130 outrow32[j] = inrow32[-j];
135 for (j = 0; j < (inlink->w >> hsub); j++)
136 memcpy(outrow + j*step, inrow - j*step, step);
139 inrow += inpic ->linesize[plane];
140 outrow += outpic->linesize[plane];
144 ff_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
147 AVFilter avfilter_vf_hflip = {
149 .description = NULL_IF_CONFIG_SMALL("Horizontally flip the input video."),
150 .priv_size = sizeof(FlipContext),
151 .query_formats = query_formats,
153 .inputs = (AVFilterPad[]) {{ .name = "default",
154 .type = AVMEDIA_TYPE_VIDEO,
155 .draw_slice = draw_slice,
156 .config_props = config_props,
157 .min_perms = AV_PERM_READ, },
159 .outputs = (AVFilterPad[]) {{ .name = "default",
160 .type = AVMEDIA_TYPE_VIDEO, },