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path: root/libavfilter/vf_hflip.c (plain)
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1/*
2 * Copyright (c) 2007 Benoit Fouet
3 * Copyright (c) 2010 Stefano Sabatini
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg 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.
11 *
12 * FFmpeg 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.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22/**
23 * @file
24 * horizontal flip filter
25 */
26
27#include <string.h>
28
29#include "libavutil/opt.h"
30#include "avfilter.h"
31#include "formats.h"
32#include "internal.h"
33#include "video.h"
34#include "libavutil/pixdesc.h"
35#include "libavutil/internal.h"
36#include "libavutil/intreadwrite.h"
37#include "libavutil/imgutils.h"
38
39typedef struct FlipContext {
40 const AVClass *class;
41 int max_step[4]; ///< max pixel step for each plane, expressed as a number of bytes
42 int planewidth[4]; ///< width of each plane
43 int planeheight[4]; ///< height of each plane
44} FlipContext;
45
46static const AVOption hflip_options[] = {
47 { NULL }
48};
49
50AVFILTER_DEFINE_CLASS(hflip);
51
52static int query_formats(AVFilterContext *ctx)
53{
54 AVFilterFormats *pix_fmts = NULL;
55 int fmt, ret;
56
57 for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
58 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
59 if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
60 desc->flags & AV_PIX_FMT_FLAG_BITSTREAM ||
61 (desc->log2_chroma_w != desc->log2_chroma_h &&
62 desc->comp[0].plane == desc->comp[1].plane)) &&
63 (ret = ff_add_format(&pix_fmts, fmt)) < 0)
64 return ret;
65 }
66
67 return ff_set_common_formats(ctx, pix_fmts);
68}
69
70static int config_props(AVFilterLink *inlink)
71{
72 FlipContext *s = inlink->dst->priv;
73 const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
74 const int hsub = pix_desc->log2_chroma_w;
75 const int vsub = pix_desc->log2_chroma_h;
76
77 av_image_fill_max_pixsteps(s->max_step, NULL, pix_desc);
78 s->planewidth[0] = s->planewidth[3] = inlink->w;
79 s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, hsub);
80 s->planeheight[0] = s->planeheight[3] = inlink->h;
81 s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, vsub);
82
83 return 0;
84}
85
86typedef struct ThreadData {
87 AVFrame *in, *out;
88} ThreadData;
89
90static int filter_slice(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
91{
92 FlipContext *s = ctx->priv;
93 ThreadData *td = arg;
94 AVFrame *in = td->in;
95 AVFrame *out = td->out;
96 uint8_t *inrow, *outrow;
97 int i, j, plane, step;
98
99 for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++) {
100 const int width = s->planewidth[plane];
101 const int height = s->planeheight[plane];
102 const int start = (height * job ) / nb_jobs;
103 const int end = (height * (job+1)) / nb_jobs;
104
105 step = s->max_step[plane];
106
107 outrow = out->data[plane] + start * out->linesize[plane];
108 inrow = in ->data[plane] + start * in->linesize[plane] + (width - 1) * step;
109 for (i = start; i < end; i++) {
110 switch (step) {
111 case 1:
112 for (j = 0; j < width; j++)
113 outrow[j] = inrow[-j];
114 break;
115
116 case 2:
117 {
118 uint16_t *outrow16 = (uint16_t *)outrow;
119 uint16_t * inrow16 = (uint16_t *) inrow;
120 for (j = 0; j < width; j++)
121 outrow16[j] = inrow16[-j];
122 }
123 break;
124
125 case 3:
126 {
127 uint8_t *in = inrow;
128 uint8_t *out = outrow;
129 for (j = 0; j < width; j++, out += 3, in -= 3) {
130 int32_t v = AV_RB24(in);
131 AV_WB24(out, v);
132 }
133 }
134 break;
135
136 case 4:
137 {
138 uint32_t *outrow32 = (uint32_t *)outrow;
139 uint32_t * inrow32 = (uint32_t *) inrow;
140 for (j = 0; j < width; j++)
141 outrow32[j] = inrow32[-j];
142 }
143 break;
144
145 default:
146 for (j = 0; j < width; j++)
147 memcpy(outrow + j*step, inrow - j*step, step);
148 }
149
150 inrow += in ->linesize[plane];
151 outrow += out->linesize[plane];
152 }
153 }
154
155 return 0;
156}
157
158static int filter_frame(AVFilterLink *inlink, AVFrame *in)
159{
160 AVFilterContext *ctx = inlink->dst;
161 AVFilterLink *outlink = ctx->outputs[0];
162 ThreadData td;
163 AVFrame *out;
164
165 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
166 if (!out) {
167 av_frame_free(&in);
168 return AVERROR(ENOMEM);
169 }
170 av_frame_copy_props(out, in);
171
172 /* copy palette if required */
173 if (av_pix_fmt_desc_get(inlink->format)->flags & AV_PIX_FMT_FLAG_PAL)
174 memcpy(out->data[1], in->data[1], AVPALETTE_SIZE);
175
176 td.in = in, td.out = out;
177 ctx->internal->execute(ctx, filter_slice, &td, NULL, FFMIN(outlink->h, ff_filter_get_nb_threads(ctx)));
178
179 av_frame_free(&in);
180 return ff_filter_frame(outlink, out);
181}
182
183static const AVFilterPad avfilter_vf_hflip_inputs[] = {
184 {
185 .name = "default",
186 .type = AVMEDIA_TYPE_VIDEO,
187 .filter_frame = filter_frame,
188 .config_props = config_props,
189 },
190 { NULL }
191};
192
193static const AVFilterPad avfilter_vf_hflip_outputs[] = {
194 {
195 .name = "default",
196 .type = AVMEDIA_TYPE_VIDEO,
197 },
198 { NULL }
199};
200
201AVFilter ff_vf_hflip = {
202 .name = "hflip",
203 .description = NULL_IF_CONFIG_SMALL("Horizontally flip the input video."),
204 .priv_size = sizeof(FlipContext),
205 .priv_class = &hflip_class,
206 .query_formats = query_formats,
207 .inputs = avfilter_vf_hflip_inputs,
208 .outputs = avfilter_vf_hflip_outputs,
209 .flags = AVFILTER_FLAG_SLICE_THREADS | AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
210};
211
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