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 "hflip.h"
33 #include "internal.h"
34 #include "video.h"
35 #include "libavutil/pixdesc.h"
36 #include "libavutil/internal.h"
37 #include "libavutil/intreadwrite.h"
38 #include "libavutil/imgutils.h"
39
40 static const AVOption hflip_options[] = {
41 { NULL }
42 };
43
44 AVFILTER_DEFINE_CLASS(hflip);
45
query_formats(AVFilterContext * ctx)46 static int query_formats(AVFilterContext *ctx)
47 {
48 AVFilterFormats *pix_fmts = NULL;
49 int fmt, ret;
50
51 for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
52 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
53 if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
54 desc->flags & AV_PIX_FMT_FLAG_BITSTREAM ||
55 (desc->log2_chroma_w != desc->log2_chroma_h &&
56 desc->comp[0].plane == desc->comp[1].plane)) &&
57 (ret = ff_add_format(&pix_fmts, fmt)) < 0)
58 return ret;
59 }
60
61 return ff_set_common_formats(ctx, pix_fmts);
62 }
63
hflip_byte_c(const uint8_t * src,uint8_t * dst,int w)64 static void hflip_byte_c(const uint8_t *src, uint8_t *dst, int w)
65 {
66 int j;
67
68 for (j = 0; j < w; j++)
69 dst[j] = src[-j];
70 }
71
hflip_short_c(const uint8_t * ssrc,uint8_t * ddst,int w)72 static void hflip_short_c(const uint8_t *ssrc, uint8_t *ddst, int w)
73 {
74 const uint16_t *src = (const uint16_t *)ssrc;
75 uint16_t *dst = (uint16_t *)ddst;
76 int j;
77
78 for (j = 0; j < w; j++)
79 dst[j] = src[-j];
80 }
81
hflip_dword_c(const uint8_t * ssrc,uint8_t * ddst,int w)82 static void hflip_dword_c(const uint8_t *ssrc, uint8_t *ddst, int w)
83 {
84 const uint32_t *src = (const uint32_t *)ssrc;
85 uint32_t *dst = (uint32_t *)ddst;
86 int j;
87
88 for (j = 0; j < w; j++)
89 dst[j] = src[-j];
90 }
91
hflip_b24_c(const uint8_t * src,uint8_t * dst,int w)92 static void hflip_b24_c(const uint8_t *src, uint8_t *dst, int w)
93 {
94 const uint8_t *in = src;
95 uint8_t *out = dst;
96 int j;
97
98 for (j = 0; j < w; j++, out += 3, in -= 3) {
99 int32_t v = AV_RB24(in);
100
101 AV_WB24(out, v);
102 }
103 }
104
hflip_b48_c(const uint8_t * src,uint8_t * dst,int w)105 static void hflip_b48_c(const uint8_t *src, uint8_t *dst, int w)
106 {
107 const uint8_t *in = src;
108 uint8_t *out = dst;
109 int j;
110
111 for (j = 0; j < w; j++, out += 6, in -= 6) {
112 int64_t v = AV_RB48(in);
113
114 AV_WB48(out, v);
115 }
116 }
117
hflip_qword_c(const uint8_t * ssrc,uint8_t * ddst,int w)118 static void hflip_qword_c(const uint8_t *ssrc, uint8_t *ddst, int w)
119 {
120 const uint64_t *src = (const uint64_t *)ssrc;
121 uint64_t *dst = (uint64_t *)ddst;
122 int j;
123
124 for (j = 0; j < w; j++)
125 dst[j] = src[-j];
126 }
127
config_props(AVFilterLink * inlink)128 static int config_props(AVFilterLink *inlink)
129 {
130 FlipContext *s = inlink->dst->priv;
131 const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
132 const int hsub = pix_desc->log2_chroma_w;
133 const int vsub = pix_desc->log2_chroma_h;
134 int nb_planes;
135
136 av_image_fill_max_pixsteps(s->max_step, NULL, pix_desc);
137 s->planewidth[0] = s->planewidth[3] = inlink->w;
138 s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, hsub);
139 s->planeheight[0] = s->planeheight[3] = inlink->h;
140 s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, vsub);
141 s->bayer_plus1 = !!(pix_desc->flags & AV_PIX_FMT_FLAG_BAYER) + 1;
142
143 nb_planes = av_pix_fmt_count_planes(inlink->format);
144
145 return ff_hflip_init(s, s->max_step, nb_planes);
146 }
147
ff_hflip_init(FlipContext * s,int step[4],int nb_planes)148 int ff_hflip_init(FlipContext *s, int step[4], int nb_planes)
149 {
150 int i;
151
152 for (i = 0; i < nb_planes; i++) {
153 step[i] *= s->bayer_plus1;
154 switch (step[i]) {
155 case 1: s->flip_line[i] = hflip_byte_c; break;
156 case 2: s->flip_line[i] = hflip_short_c; break;
157 case 3: s->flip_line[i] = hflip_b24_c; break;
158 case 4: s->flip_line[i] = hflip_dword_c; break;
159 case 6: s->flip_line[i] = hflip_b48_c; break;
160 case 8: s->flip_line[i] = hflip_qword_c; break;
161 default:
162 return AVERROR_BUG;
163 }
164 }
165 if (ARCH_X86)
166 ff_hflip_init_x86(s, step, nb_planes);
167
168 return 0;
169 }
170
171 typedef struct ThreadData {
172 AVFrame *in, *out;
173 } ThreadData;
174
filter_slice(AVFilterContext * ctx,void * arg,int job,int nb_jobs)175 static int filter_slice(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
176 {
177 FlipContext *s = ctx->priv;
178 ThreadData *td = arg;
179 AVFrame *in = td->in;
180 AVFrame *out = td->out;
181 uint8_t *inrow, *outrow;
182 int i, plane, step;
183
184 for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++) {
185 const int width = s->planewidth[plane] / s->bayer_plus1;
186 const int height = s->planeheight[plane];
187 const int start = (height * job ) / nb_jobs;
188 const int end = (height * (job+1)) / nb_jobs;
189
190 step = s->max_step[plane];
191
192 outrow = out->data[plane] + start * out->linesize[plane];
193 inrow = in ->data[plane] + start * in->linesize[plane] + (width - 1) * step;
194 for (i = start; i < end; i++) {
195 s->flip_line[plane](inrow, outrow, width);
196
197 inrow += in ->linesize[plane];
198 outrow += out->linesize[plane];
199 }
200 }
201
202 return 0;
203 }
204
filter_frame(AVFilterLink * inlink,AVFrame * in)205 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
206 {
207 AVFilterContext *ctx = inlink->dst;
208 AVFilterLink *outlink = ctx->outputs[0];
209 ThreadData td;
210 AVFrame *out;
211
212 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
213 if (!out) {
214 av_frame_free(&in);
215 return AVERROR(ENOMEM);
216 }
217 av_frame_copy_props(out, in);
218
219 /* copy palette if required */
220 if (av_pix_fmt_desc_get(inlink->format)->flags & AV_PIX_FMT_FLAG_PAL)
221 memcpy(out->data[1], in->data[1], AVPALETTE_SIZE);
222
223 td.in = in, td.out = out;
224 ctx->internal->execute(ctx, filter_slice, &td, NULL, FFMIN(outlink->h, ff_filter_get_nb_threads(ctx)));
225
226 av_frame_free(&in);
227 return ff_filter_frame(outlink, out);
228 }
229
230 static const AVFilterPad avfilter_vf_hflip_inputs[] = {
231 {
232 .name = "default",
233 .type = AVMEDIA_TYPE_VIDEO,
234 .filter_frame = filter_frame,
235 .config_props = config_props,
236 },
237 { NULL }
238 };
239
240 static const AVFilterPad avfilter_vf_hflip_outputs[] = {
241 {
242 .name = "default",
243 .type = AVMEDIA_TYPE_VIDEO,
244 },
245 { NULL }
246 };
247
248 AVFilter ff_vf_hflip = {
249 .name = "hflip",
250 .description = NULL_IF_CONFIG_SMALL("Horizontally flip the input video."),
251 .priv_size = sizeof(FlipContext),
252 .priv_class = &hflip_class,
253 .query_formats = query_formats,
254 .inputs = avfilter_vf_hflip_inputs,
255 .outputs = avfilter_vf_hflip_outputs,
256 .flags = AVFILTER_FLAG_SLICE_THREADS | AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
257 };
258