1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
/*
* Copyright (c) 2007 Benoit Fouet
* Copyright (c) 2010 Stefano Sabatini
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* horizontal flip filter
*/
#include <string.h>
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
#include "libavutil/pixdesc.h"
#include "libavutil/internal.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/imgutils.h"
typedef struct FlipContext {
int max_step[4]; ///< max pixel step for each plane, expressed as a number of bytes
int planewidth[4]; ///< width of each plane
int planeheight[4]; ///< height of each plane
} FlipContext;
static int query_formats(AVFilterContext *ctx)
{
AVFilterFormats *pix_fmts = NULL;
int fmt, ret;
for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
desc->flags & AV_PIX_FMT_FLAG_BITSTREAM ||
(desc->log2_chroma_w != desc->log2_chroma_h &&
desc->comp[0].plane == desc->comp[1].plane)) &&
(ret = ff_add_format(&pix_fmts, fmt)) < 0)
return ret;
}
return ff_set_common_formats(ctx, pix_fmts);
}
static int config_props(AVFilterLink *inlink)
{
FlipContext *s = inlink->dst->priv;
const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
const int hsub = pix_desc->log2_chroma_w;
const int vsub = pix_desc->log2_chroma_h;
av_image_fill_max_pixsteps(s->max_step, NULL, pix_desc);
s->planewidth[0] = s->planewidth[3] = inlink->w;
s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, hsub);
s->planeheight[0] = s->planeheight[3] = inlink->h;
s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, vsub);
return 0;
}
typedef struct ThreadData {
AVFrame *in, *out;
} ThreadData;
static int filter_slice(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
{
FlipContext *s = ctx->priv;
ThreadData *td = arg;
AVFrame *in = td->in;
AVFrame *out = td->out;
uint8_t *inrow, *outrow;
int i, j, plane, step;
for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++) {
const int width = s->planewidth[plane];
const int height = s->planeheight[plane];
const int start = (height * job ) / nb_jobs;
const int end = (height * (job+1)) / nb_jobs;
step = s->max_step[plane];
outrow = out->data[plane] + start * out->linesize[plane];
inrow = in ->data[plane] + start * in->linesize[plane] + (width - 1) * step;
for (i = start; i < end; i++) {
switch (step) {
case 1:
for (j = 0; j < width; j++)
outrow[j] = inrow[-j];
break;
case 2:
{
uint16_t *outrow16 = (uint16_t *)outrow;
uint16_t * inrow16 = (uint16_t *) inrow;
for (j = 0; j < width; j++)
outrow16[j] = inrow16[-j];
}
break;
case 3:
{
uint8_t *in = inrow;
uint8_t *out = outrow;
for (j = 0; j < width; j++, out += 3, in -= 3) {
int32_t v = AV_RB24(in);
AV_WB24(out, v);
}
}
break;
case 4:
{
uint32_t *outrow32 = (uint32_t *)outrow;
uint32_t * inrow32 = (uint32_t *) inrow;
for (j = 0; j < width; j++)
outrow32[j] = inrow32[-j];
}
break;
default:
for (j = 0; j < width; j++)
memcpy(outrow + j*step, inrow - j*step, step);
}
inrow += in ->linesize[plane];
outrow += out->linesize[plane];
}
}
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
ThreadData td;
AVFrame *out;
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out) {
av_frame_free(&in);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, in);
/* copy palette if required */
if (av_pix_fmt_desc_get(inlink->format)->flags & AV_PIX_FMT_FLAG_PAL)
memcpy(out->data[1], in->data[1], AVPALETTE_SIZE);
td.in = in, td.out = out;
ctx->internal->execute(ctx, filter_slice, &td, NULL, FFMIN(outlink->h, ctx->graph->nb_threads));
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
static const AVFilterPad avfilter_vf_hflip_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
.config_props = config_props,
},
{ NULL }
};
static const AVFilterPad avfilter_vf_hflip_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
AVFilter ff_vf_hflip = {
.name = "hflip",
.description = NULL_IF_CONFIG_SMALL("Horizontally flip the input video."),
.priv_size = sizeof(FlipContext),
.query_formats = query_formats,
.inputs = avfilter_vf_hflip_inputs,
.outputs = avfilter_vf_hflip_outputs,
.flags = AVFILTER_FLAG_SLICE_THREADS,
};
|
