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vf_swaprect.c
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1 /*
2  * Copyright (c) 2015 Paul B. Mahol
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "libavutil/avassert.h"
22 #include "libavutil/eval.h"
23 #include "libavutil/imgutils.h"
24 #include "libavutil/mem.h"
25 #include "libavutil/opt.h"
26 
27 #include "avfilter.h"
28 #include "filters.h"
29 #include "formats.h"
30 #include "video.h"
31 
32 typedef struct SwapRectContext {
33  const AVClass *class;
34  char *w, *h;
35  char *x1, *y1;
36  char *x2, *y2;
37 
38  int nb_planes;
39  int pixsteps[4];
40 
41  const AVPixFmtDescriptor *desc;
42  uint8_t *temp;
43 } SwapRectContext;
44 
45 #define OFFSET(x) offsetof(SwapRectContext, x)
46 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
47 static const AVOption swaprect_options[] = {
48  { "w", "set rect width", OFFSET(w), AV_OPT_TYPE_STRING, {.str="w/2"}, 0, 0, .flags = FLAGS },
49  { "h", "set rect height", OFFSET(h), AV_OPT_TYPE_STRING, {.str="h/2"}, 0, 0, .flags = FLAGS },
50  { "x1", "set 1st rect x top left coordinate", OFFSET(x1), AV_OPT_TYPE_STRING, {.str="w/2"}, 0, 0, .flags = FLAGS },
51  { "y1", "set 1st rect y top left coordinate", OFFSET(y1), AV_OPT_TYPE_STRING, {.str="h/2"}, 0, 0, .flags = FLAGS },
52  { "x2", "set 2nd rect x top left coordinate", OFFSET(x2), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, .flags = FLAGS },
53  { "y2", "set 2nd rect y top left coordinate", OFFSET(y2), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, .flags = FLAGS },
54  { NULL },
55 };
56 
57 AVFILTER_DEFINE_CLASS(swaprect);
58 
59 static int query_formats(const AVFilterContext *ctx,
60  AVFilterFormatsConfig **cfg_in,
61  AVFilterFormatsConfig **cfg_out)
62 {
63  int reject_flags = AV_PIX_FMT_FLAG_PAL |
64  AV_PIX_FMT_FLAG_HWACCEL |
65  AV_PIX_FMT_FLAG_BITSTREAM;
66 
67  return ff_set_common_formats2(ctx, cfg_in, cfg_out,
68  ff_formats_pixdesc_filter(0, reject_flags));
69 }
70 
71 static const char *const var_names[] = { "w", "h", "a", "n", "t", "sar", "dar", NULL };
72 enum { VAR_W, VAR_H, VAR_A, VAR_N, VAR_T, VAR_SAR, VAR_DAR, VAR_VARS_NB };
73 
74 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
75 {
76  FilterLink *inl = ff_filter_link(inlink);
77  AVFilterContext *ctx = inlink->dst;
78  AVFilterLink *outlink = ctx->outputs[0];
79  SwapRectContext *s = ctx->priv;
80  double var_values[VAR_VARS_NB];
81  int x1[4], y1[4];
82  int x2[4], y2[4];
83  int aw[4], ah[4];
84  int lw[4], lh[4];
85  int pw[4], ph[4];
86  double dw, dh;
87  double dx1, dy1;
88  double dx2, dy2;
89  int y, p, w, h, ret;
90 
91  var_values[VAR_W] = inlink->w;
92  var_values[VAR_H] = inlink->h;
93  var_values[VAR_A] = (float) inlink->w / inlink->h;
94  var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
95  var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR];
96  var_values[VAR_N] = inl->frame_count_out;
97  var_values[VAR_T] = in->pts == AV_NOPTS_VALUE ? NAN : in->pts * av_q2d(inlink->time_base);
98 
99  ret = av_expr_parse_and_eval(&dw, s->w,
100  var_names, &var_values[0],
101  NULL, NULL, NULL, NULL,
102  0, 0, ctx);
103  if (ret < 0)
104  return ret;
105 
106  ret = av_expr_parse_and_eval(&dh, s->h,
107  var_names, &var_values[0],
108  NULL, NULL, NULL, NULL,
109  0, 0, ctx);
110  if (ret < 0)
111  return ret;
112 
113  ret = av_expr_parse_and_eval(&dx1, s->x1,
114  var_names, &var_values[0],
115  NULL, NULL, NULL, NULL,
116  0, 0, ctx);
117  if (ret < 0)
118  return ret;
119 
120  ret = av_expr_parse_and_eval(&dy1, s->y1,
121  var_names, &var_values[0],
122  NULL, NULL, NULL, NULL,
123  0, 0, ctx);
124  if (ret < 0)
125  return ret;
126 
127  ret = av_expr_parse_and_eval(&dx2, s->x2,
128  var_names, &var_values[0],
129  NULL, NULL, NULL, NULL,
130  0, 0, ctx);
131  if (ret < 0)
132  return ret;
133 
134  ret = av_expr_parse_and_eval(&dy2, s->y2,
135  var_names, &var_values[0],
136  NULL, NULL, NULL, NULL,
137  0, 0, ctx);
138  if (ret < 0)
139  return ret;
140 
141  w = dw; h = dh; x1[0] = dx1; y1[0] = dy1; x2[0] = dx2; y2[0] = dy2;
142 
143  x1[0] = av_clip(x1[0], 0, inlink->w - 1);
144  y1[0] = av_clip(y1[0], 0, inlink->h - 1);
145 
146  x2[0] = av_clip(x2[0], 0, inlink->w - 1);
147  y2[0] = av_clip(y2[0], 0, inlink->h - 1);
148 
149  ah[1] = ah[2] = AV_CEIL_RSHIFT(h, s->desc->log2_chroma_h);
150  ah[0] = ah[3] = h;
151  aw[1] = aw[2] = AV_CEIL_RSHIFT(w, s->desc->log2_chroma_w);
152  aw[0] = aw[3] = w;
153 
154  w = FFMIN3(w, inlink->w - x1[0], inlink->w - x2[0]);
155  h = FFMIN3(h, inlink->h - y1[0], inlink->h - y2[0]);
156 
157  ph[1] = ph[2] = AV_CEIL_RSHIFT(h, s->desc->log2_chroma_h);
158  ph[0] = ph[3] = h;
159  pw[1] = pw[2] = AV_CEIL_RSHIFT(w, s->desc->log2_chroma_w);
160  pw[0] = pw[3] = w;
161 
162  lh[1] = lh[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
163  lh[0] = lh[3] = inlink->h;
164  lw[1] = lw[2] = AV_CEIL_RSHIFT(inlink->w, s->desc->log2_chroma_w);
165  lw[0] = lw[3] = inlink->w;
166 
167  x1[1] = x1[2] = (x1[0] >> s->desc->log2_chroma_w);
168  x1[0] = x1[3] = x1[0];
169  y1[1] = y1[2] = (y1[0] >> s->desc->log2_chroma_h);
170  y1[0] = y1[3] = y1[0];
171 
172  x2[1] = x2[2] = (x2[0] >> s->desc->log2_chroma_w);
173  x2[0] = x2[3] = x2[0];
174  y2[1] = y2[2] = (y2[0] >> s->desc->log2_chroma_h);
175  y2[0] = y2[3] = y2[0];
176 
177 
178  av_assert0(FFMAX(x1[1], x2[1]) + pw[1] <= lw[1]);
179  av_assert0(FFMAX(y1[1], y2[1]) + ph[1] <= lh[1]);
180 
181  for (p = 0; p < s->nb_planes; p++) {
182  if (ph[p] == ah[p] && pw[p] == aw[p]) {
183  uint8_t *src = in->data[p] + y1[p] * in->linesize[p] + x1[p] * s->pixsteps[p];
184  uint8_t *dst = in->data[p] + y2[p] * in->linesize[p] + x2[p] * s->pixsteps[p];
185 
186  for (y = 0; y < ph[p]; y++) {
187  memcpy(s->temp, src, pw[p] * s->pixsteps[p]);
188  memmove(src, dst, pw[p] * s->pixsteps[p]);
189  memcpy(dst, s->temp, pw[p] * s->pixsteps[p]);
190  src += in->linesize[p];
191  dst += in->linesize[p];
192  }
193  }
194  }
195 
196  return ff_filter_frame(outlink, in);
197 }
198 
199 static int config_input(AVFilterLink *inlink)
200 {
201  AVFilterContext *ctx = inlink->dst;
202  SwapRectContext *s = ctx->priv;
203 
204  if (!s->w || !s->h ||
205  !s->x1 || !s->y1 ||
206  !s->x2 || !s->y2)
207  return AVERROR(EINVAL);
208 
209  s->desc = av_pix_fmt_desc_get(inlink->format);
210  av_image_fill_max_pixsteps(s->pixsteps, NULL, s->desc);
211  s->nb_planes = av_pix_fmt_count_planes(inlink->format);
212 
213  s->temp = av_malloc_array(inlink->w, s->pixsteps[0]);
214  if (!s->temp)
215  return AVERROR(ENOMEM);
216 
217  return 0;
218 }
219 
220 static av_cold void uninit(AVFilterContext *ctx)
221 {
222  SwapRectContext *s = ctx->priv;
223  av_freep(&s->temp);
224 }
225 
226 static const AVFilterPad inputs[] = {
227  {
228  .name = "default",
229  .type = AVMEDIA_TYPE_VIDEO,
230  .flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
231  .filter_frame = filter_frame,
232  .config_props = config_input,
233  },
234 };
235 
236 const FFFilter ff_vf_swaprect = {
237  .p.name = "swaprect",
238  .p.description = NULL_IF_CONFIG_SMALL("Swap 2 rectangular objects in video."),
239  .p.priv_class = &swaprect_class,
240  .p.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
241  .priv_size = sizeof(SwapRectContext),
242  .uninit = uninit,
243  FILTER_INPUTS(inputs),
244  FILTER_OUTPUTS(ff_video_default_filterpad),
245  FILTER_QUERY_FUNC2(query_formats),
246  .process_command = ff_filter_process_command,
247 };
av_clip
#define av_clip
Definition: common.h:100
SwapRectContext::y1
char * y1
Definition: vf_swaprect.c:35
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
opt.h
FLAGS
#define FLAGS
Definition: vf_swaprect.c:46
SwapRectContext::y2
char * y2
Definition: vf_swaprect.c:36
SwapRectContext::temp
uint8_t * temp
Definition: vf_swaprect.c:42
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1053
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:3341
VAR_W
@ VAR_W
Definition: vf_swaprect.c:72
ff_set_common_formats2
int ff_set_common_formats2(const AVFilterContext *ctx, AVFilterFormatsConfig **cfg_in, AVFilterFormatsConfig **cfg_out, AVFilterFormats *formats)
Definition: formats.c:1007
inlink
The exact code depends on how similar the blocks are and how related they are to the and needs to apply these operations to the correct inlink or outlink if there are several Macros are available to factor that when no extra processing is inlink
Definition: filter_design.txt:212
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_swaprect.c:220
SwapRectContext::desc
const AVPixFmtDescriptor * desc
Definition: vf_swaprect.c:41
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: filters.h:262
ph
static int FUNC() ph(CodedBitstreamContext *ctx, RWContext *rw, H266RawPH *current)
Definition: cbs_h266_syntax_template.c:3043
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:410
AVFrame::pts
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:512
w
uint8_t w
Definition: llviddspenc.c:38
AVOption
AVOption.
Definition: opt.h:429
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:203
video.h
query_formats
static int query_formats(const AVFilterContext *ctx, AVFilterFormatsConfig **cfg_in, AVFilterFormatsConfig **cfg_out)
Definition: vf_swaprect.c:59
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:431
formats.h
av_pix_fmt_count_planes
int av_pix_fmt_count_planes(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:3381
SwapRectContext::pixsteps
int pixsteps[4]
Definition: vf_swaprect.c:39
VAR_H
@ VAR_H
Definition: vf_swaprect.c:72
AV_PIX_FMT_FLAG_HWACCEL
#define AV_PIX_FMT_FLAG_HWACCEL
Pixel format is an HW accelerated format.
Definition: pixdesc.h:128
SwapRectContext
Definition: vf_swaprect.c:32
AVFilterPad
A filter pad used for either input or output.
Definition: filters.h:38
VAR_N
@ VAR_N
Definition: vf_swaprect.c:72
avassert.h
av_cold
#define av_cold
Definition: attributes.h:90
ff_video_default_filterpad
const AVFilterPad ff_video_default_filterpad[1]
An AVFilterPad array whose only entry has name "default" and is of type AVMEDIA_TYPE_VIDEO.
Definition: video.c:37
FFFilter
Definition: filters.h:265
VAR_T
@ VAR_T
Definition: vf_swaprect.c:72
float
float
Definition: af_crystalizer.c:122
s
#define s(width, name)
Definition: cbs_vp9.c:198
VAR_VARS_NB
@ VAR_VARS_NB
Definition: vf_swaprect.c:72
AV_CEIL_RSHIFT
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:60
av_q2d
static double av_q2d(AVRational a)
Convert an AVRational to a double.
Definition: rational.h:104
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:40
filters.h
ctx
AVFormatContext * ctx
Definition: movenc.c:49
SwapRectContext::x2
char * x2
Definition: vf_swaprect.c:36
SwapRectContext::h
char * h
Definition: vf_swaprect.c:34
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: filters.h:263
NAN
#define NAN
Definition: mathematics.h:115
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:75
NULL
#define NULL
Definition: coverity.c:32
AVFilterFormatsConfig
Lists of formats / etc.
Definition: avfilter.h:109
ff_filter_link
static FilterLink * ff_filter_link(AVFilterLink *link)
Definition: filters.h:197
eval.h
AVFILTERPAD_FLAG_NEEDS_WRITABLE
#define AVFILTERPAD_FLAG_NEEDS_WRITABLE
The filter expects writable frames from its input link, duplicating data buffers if needed.
Definition: filters.h:57
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:94
av_expr_parse_and_eval
int av_expr_parse_and_eval(double *d, const char *s, const char *const *const_names, const double *const_values, const char *const *func1_names, double(*const *funcs1)(void *, double), const char *const *func2_names, double(*const *funcs2)(void *, double, double), void *opaque, int log_offset, void *log_ctx)
Parse and evaluate an expression.
Definition: eval.c:805
dst
uint8_t ptrdiff_t const uint8_t ptrdiff_t int intptr_t intptr_t int int16_t * dst
Definition: dsp.h:83
SwapRectContext::w
char * w
Definition: vf_swaprect.c:34
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
AV_PIX_FMT_FLAG_BITSTREAM
#define AV_PIX_FMT_FLAG_BITSTREAM
All values of a component are bit-wise packed end to end.
Definition: pixdesc.h:124
ff_filter_process_command
int ff_filter_process_command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
Generic processing of user supplied commands that are set in the same way as the filter options.
Definition: avfilter.c:900
SwapRectContext::x1
char * x1
Definition: vf_swaprect.c:35
VAR_A
@ VAR_A
Definition: vf_swaprect.c:72
AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
#define AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
Some filters support a generic "enable" expression option that can be used to enable or disable a fil...
Definition: avfilter.h:180
ff_formats_pixdesc_filter
AVFilterFormats * ff_formats_pixdesc_filter(unsigned want, unsigned rej)
Construct a formats list containing all pixel formats with certain properties.
Definition: formats.c:553
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(swaprect)
VAR_DAR
@ VAR_DAR
Definition: vf_swaprect.c:72
FFMIN3
#define FFMIN3(a, b, c)
Definition: macros.h:50
av_malloc_array
#define av_malloc_array(a, b)
Definition: tableprint_vlc.h:32
FILTER_QUERY_FUNC2
#define FILTER_QUERY_FUNC2(func)
Definition: filters.h:239
AVFilterPad::name
const char * name
Pad name.
Definition: filters.h:44
ff_vf_swaprect
const FFFilter ff_vf_swaprect
Definition: vf_swaprect.c:236
ret
ret
Definition: filter_design.txt:187
VAR_SAR
@ VAR_SAR
Definition: vf_swaprect.c:72
OFFSET
#define OFFSET(x)
Definition: vf_swaprect.c:45
swaprect_options
static const AVOption swaprect_options[]
Definition: vf_swaprect.c:47
avfilter.h
SwapRectContext::nb_planes
int nb_planes
Definition: vf_swaprect.c:38
av_image_fill_max_pixsteps
void av_image_fill_max_pixsteps(int max_pixsteps[4], int max_pixstep_comps[4], const AVPixFmtDescriptor *pixdesc)
Compute the max pixel step for each plane of an image with a format described by pixdesc.
Definition: imgutils.c:35
AVFilterContext
An instance of a filter.
Definition: avfilter.h:257
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
FFFilter::p
AVFilter p
The public AVFilter.
Definition: filters.h:269
mem.h
var_names
static const char *const var_names[]
Definition: vf_swaprect.c:71
AVPixFmtDescriptor
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:69
inputs
static const AVFilterPad inputs[]
Definition: vf_swaprect.c:226
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
imgutils.h
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, a positive or negative value, which is typically indicating the size in bytes of each pict...
Definition: frame.h:455
h
h
Definition: vp9dsp_template.c:2070
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Underlying C type is a uint8_t* that is either NULL or points to a C string allocated with the av_mal...
Definition: opt.h:276
AV_PIX_FMT_FLAG_PAL
#define AV_PIX_FMT_FLAG_PAL
Pixel format has a palette in data[1], values are indexes in this palette.
Definition: pixdesc.h:120
src
#define src
Definition: vp8dsp.c:248
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: vf_swaprect.c:74
config_input
static int config_input(AVFilterLink *inlink)
Definition: vf_swaprect.c:199
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