FFmpeg
vf_swaprect.c
Go to the documentation of this file.
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 "formats.h"
29 #include "internal.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(AVFilterContext *ctx)
60 {
61  int reject_flags = AV_PIX_FMT_FLAG_PAL |
62  AV_PIX_FMT_FLAG_HWACCEL |
63  AV_PIX_FMT_FLAG_BITSTREAM;
64 
65  return ff_set_common_formats(ctx, ff_formats_pixdesc_filter(0, reject_flags));
66 }
67 
68 static const char *const var_names[] = { "w", "h", "a", "n", "t",
69 #if FF_API_FRAME_PKT
70  "pos",
71 #endif
72  "sar", "dar", NULL };
73 enum { VAR_W, VAR_H, VAR_A, VAR_N, VAR_T,
74 #if FF_API_FRAME_PKT
75  VAR_POS,
76 #endif
77  VAR_SAR, VAR_DAR, VAR_VARS_NB };
78 
79 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
80 {
81  AVFilterContext *ctx = inlink->dst;
82  AVFilterLink *outlink = ctx->outputs[0];
83  SwapRectContext *s = ctx->priv;
84  double var_values[VAR_VARS_NB];
85  int x1[4], y1[4];
86  int x2[4], y2[4];
87  int aw[4], ah[4];
88  int lw[4], lh[4];
89  int pw[4], ph[4];
90  double dw, dh;
91  double dx1, dy1;
92  double dx2, dy2;
93  int y, p, w, h, ret;
94 
95  var_values[VAR_W] = inlink->w;
96  var_values[VAR_H] = inlink->h;
97  var_values[VAR_A] = (float) inlink->w / inlink->h;
98  var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
99  var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR];
100  var_values[VAR_N] = inlink->frame_count_out;
101  var_values[VAR_T] = in->pts == AV_NOPTS_VALUE ? NAN : in->pts * av_q2d(inlink->time_base);
102 #if FF_API_FRAME_PKT
103 FF_DISABLE_DEPRECATION_WARNINGS
104  var_values[VAR_POS] = in->pkt_pos == -1 ? NAN : in->pkt_pos;
105 FF_ENABLE_DEPRECATION_WARNINGS
106 #endif
107 
108  ret = av_expr_parse_and_eval(&dw, s->w,
109  var_names, &var_values[0],
110  NULL, NULL, NULL, NULL,
111  0, 0, ctx);
112  if (ret < 0)
113  return ret;
114 
115  ret = av_expr_parse_and_eval(&dh, s->h,
116  var_names, &var_values[0],
117  NULL, NULL, NULL, NULL,
118  0, 0, ctx);
119  if (ret < 0)
120  return ret;
121 
122  ret = av_expr_parse_and_eval(&dx1, s->x1,
123  var_names, &var_values[0],
124  NULL, NULL, NULL, NULL,
125  0, 0, ctx);
126  if (ret < 0)
127  return ret;
128 
129  ret = av_expr_parse_and_eval(&dy1, s->y1,
130  var_names, &var_values[0],
131  NULL, NULL, NULL, NULL,
132  0, 0, ctx);
133  if (ret < 0)
134  return ret;
135 
136  ret = av_expr_parse_and_eval(&dx2, s->x2,
137  var_names, &var_values[0],
138  NULL, NULL, NULL, NULL,
139  0, 0, ctx);
140  if (ret < 0)
141  return ret;
142 
143  ret = av_expr_parse_and_eval(&dy2, s->y2,
144  var_names, &var_values[0],
145  NULL, NULL, NULL, NULL,
146  0, 0, ctx);
147  if (ret < 0)
148  return ret;
149 
150  w = dw; h = dh; x1[0] = dx1; y1[0] = dy1; x2[0] = dx2; y2[0] = dy2;
151 
152  x1[0] = av_clip(x1[0], 0, inlink->w - 1);
153  y1[0] = av_clip(y1[0], 0, inlink->h - 1);
154 
155  x2[0] = av_clip(x2[0], 0, inlink->w - 1);
156  y2[0] = av_clip(y2[0], 0, inlink->h - 1);
157 
158  ah[1] = ah[2] = AV_CEIL_RSHIFT(h, s->desc->log2_chroma_h);
159  ah[0] = ah[3] = h;
160  aw[1] = aw[2] = AV_CEIL_RSHIFT(w, s->desc->log2_chroma_w);
161  aw[0] = aw[3] = w;
162 
163  w = FFMIN3(w, inlink->w - x1[0], inlink->w - x2[0]);
164  h = FFMIN3(h, inlink->h - y1[0], inlink->h - y2[0]);
165 
166  ph[1] = ph[2] = AV_CEIL_RSHIFT(h, s->desc->log2_chroma_h);
167  ph[0] = ph[3] = h;
168  pw[1] = pw[2] = AV_CEIL_RSHIFT(w, s->desc->log2_chroma_w);
169  pw[0] = pw[3] = w;
170 
171  lh[1] = lh[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
172  lh[0] = lh[3] = inlink->h;
173  lw[1] = lw[2] = AV_CEIL_RSHIFT(inlink->w, s->desc->log2_chroma_w);
174  lw[0] = lw[3] = inlink->w;
175 
176  x1[1] = x1[2] = (x1[0] >> s->desc->log2_chroma_w);
177  x1[0] = x1[3] = x1[0];
178  y1[1] = y1[2] = (y1[0] >> s->desc->log2_chroma_h);
179  y1[0] = y1[3] = y1[0];
180 
181  x2[1] = x2[2] = (x2[0] >> s->desc->log2_chroma_w);
182  x2[0] = x2[3] = x2[0];
183  y2[1] = y2[2] = (y2[0] >> s->desc->log2_chroma_h);
184  y2[0] = y2[3] = y2[0];
185 
186 
187  av_assert0(FFMAX(x1[1], x2[1]) + pw[1] <= lw[1]);
188  av_assert0(FFMAX(y1[1], y2[1]) + ph[1] <= lh[1]);
189 
190  for (p = 0; p < s->nb_planes; p++) {
191  if (ph[p] == ah[p] && pw[p] == aw[p]) {
192  uint8_t *src = in->data[p] + y1[p] * in->linesize[p] + x1[p] * s->pixsteps[p];
193  uint8_t *dst = in->data[p] + y2[p] * in->linesize[p] + x2[p] * s->pixsteps[p];
194 
195  for (y = 0; y < ph[p]; y++) {
196  memcpy(s->temp, src, pw[p] * s->pixsteps[p]);
197  memmove(src, dst, pw[p] * s->pixsteps[p]);
198  memcpy(dst, s->temp, pw[p] * s->pixsteps[p]);
199  src += in->linesize[p];
200  dst += in->linesize[p];
201  }
202  }
203  }
204 
205  return ff_filter_frame(outlink, in);
206 }
207 
208 static int config_input(AVFilterLink *inlink)
209 {
210  AVFilterContext *ctx = inlink->dst;
211  SwapRectContext *s = ctx->priv;
212 
213  if (!s->w || !s->h ||
214  !s->x1 || !s->y1 ||
215  !s->x2 || !s->y2)
216  return AVERROR(EINVAL);
217 
218  s->desc = av_pix_fmt_desc_get(inlink->format);
219  av_image_fill_max_pixsteps(s->pixsteps, NULL, s->desc);
220  s->nb_planes = av_pix_fmt_count_planes(inlink->format);
221 
222  s->temp = av_malloc_array(inlink->w, s->pixsteps[0]);
223  if (!s->temp)
224  return AVERROR(ENOMEM);
225 
226  return 0;
227 }
228 
229 static av_cold void uninit(AVFilterContext *ctx)
230 {
231  SwapRectContext *s = ctx->priv;
232  av_freep(&s->temp);
233 }
234 
235 static const AVFilterPad inputs[] = {
236  {
237  .name = "default",
238  .type = AVMEDIA_TYPE_VIDEO,
239  .flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
240  .filter_frame = filter_frame,
241  .config_props = config_input,
242  },
243 };
244 
245 const AVFilter ff_vf_swaprect = {
246  .name = "swaprect",
247  .description = NULL_IF_CONFIG_SMALL("Swap 2 rectangular objects in video."),
248  .priv_size = sizeof(SwapRectContext),
249  .priv_class = &swaprect_class,
250  .uninit = uninit,
251  FILTER_INPUTS(inputs),
252  FILTER_OUTPUTS(ff_video_default_filterpad),
253  FILTER_QUERY_FUNC(query_formats),
254  .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
255  .process_command = ff_filter_process_command,
256 };
FF_ENABLE_DEPRECATION_WARNINGS
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:73
av_clip
#define av_clip
Definition: common.h:99
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:1015
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2965
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:229
SwapRectContext::desc
const AVPixFmtDescriptor * desc
Definition: vf_swaprect.c:41
VAR_W
@ VAR_W
Definition: vf_swaprect.c:73
ph
static int FUNC() ph(CodedBitstreamContext *ctx, RWContext *rw, H266RawPH *current)
Definition: cbs_h266_syntax_template.c:3003
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:374
AVFrame::pts
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:486
w
uint8_t w
Definition: llviddspenc.c:38
AVOption
AVOption.
Definition: opt.h:346
FILTER_QUERY_FUNC
#define FILTER_QUERY_FUNC(func)
Definition: internal.h:159
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: vf_swaprect.c:59
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:170
video.h
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:395
formats.h
av_pix_fmt_count_planes
int av_pix_fmt_count_planes(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:3005
SwapRectContext::pixsteps
int pixsteps[4]
Definition: vf_swaprect.c:39
VAR_H
@ VAR_H
Definition: vf_swaprect.c:73
AV_PIX_FMT_FLAG_HWACCEL
#define AV_PIX_FMT_FLAG_HWACCEL
Pixel format is an HW accelerated format.
Definition: pixdesc.h:128
VAR_SAR
@ VAR_SAR
Definition: vf_swaprect.c:77
VAR_A
@ VAR_A
Definition: vf_swaprect.c:73
SwapRectContext
Definition: vf_swaprect.c:32
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:33
avassert.h
ff_vf_swaprect
const AVFilter ff_vf_swaprect
Definition: vf_swaprect.c:245
av_cold
#define av_cold
Definition: attributes.h:90
ff_set_common_formats
int ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
A helper for query_formats() which sets all links to the same list of formats.
Definition: formats.c:868
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
float
float
Definition: af_crystalizer.c:121
s
#define s(width, name)
Definition: cbs_vp9.c:198
AV_CEIL_RSHIFT
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:59
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
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
NAN
#define NAN
Definition: mathematics.h:115
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:182
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
NULL
#define NULL
Definition: coverity.c:32
VAR_POS
@ VAR_POS
Definition: noise.c:56
eval.h
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:803
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
AVFrame::pkt_pos
attribute_deprecated int64_t pkt_pos
reordered pos from the last AVPacket that has been input into the decoder
Definition: frame.h:684
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:887
SwapRectContext::x1
char * x1
Definition: vf_swaprect.c:35
internal.h
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:147
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:554
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(swaprect)
FFMIN3
#define FFMIN3(a, b, c)
Definition: macros.h:50
av_malloc_array
#define av_malloc_array(a, b)
Definition: tableprint_vlc.h:31
VAR_DAR
@ VAR_DAR
Definition: vf_swaprect.c:77
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:39
VAR_N
@ VAR_N
Definition: vf_swaprect.c:73
AVFilter
Filter definition.
Definition: avfilter.h:166
ret
ret
Definition: filter_design.txt:187
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
VAR_T
@ VAR_T
Definition: vf_swaprect.c:73
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:407
FF_DISABLE_DEPRECATION_WARNINGS
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:72
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
mem.h
var_names
static const char *const var_names[]
Definition: vf_swaprect.c:68
AVPixFmtDescriptor
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:69
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:183
inputs
static const AVFilterPad inputs[]
Definition: vf_swaprect.c:235
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
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:419
VAR_VARS_NB
@ VAR_VARS_NB
Definition: vf_swaprect.c:77
h
h
Definition: vp9dsp_template.c:2038
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Definition: opt.h:239
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
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: vf_swaprect.c:79
config_input
static int config_input(AVFilterLink *inlink)
Definition: vf_swaprect.c:208
AVFILTERPAD_FLAG_NEEDS_WRITABLE
#define AVFILTERPAD_FLAG_NEEDS_WRITABLE
The filter expects writable frames from its input link, duplicating data buffers if needed.
Definition: internal.h:52
Generated on Thu Apr 18 2024 19:22:17 for FFmpeg by   doxygen 1.8.17