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/avstring.h"
22 #include "libavutil/eval.h"
23 #include "libavutil/imgutils.h"
24 #include "libavutil/opt.h"
25 
26 #include "avfilter.h"
27 #include "formats.h"
28 #include "internal.h"
29 #include "video.h"
30 
31 typedef struct SwapRectContext {
32  const AVClass *class;
33  char *w, *h;
34  char *x1, *y1;
35  char *x2, *y2;
36 
37  int nb_planes;
38  int pixsteps[4];
39 
40  const AVPixFmtDescriptor *desc;
41  uint8_t *temp;
42 } SwapRectContext;
43 
44 #define OFFSET(x) offsetof(SwapRectContext, x)
45 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
46 static const AVOption swaprect_options[] = {
47  { "w", "set rect width", OFFSET(w), AV_OPT_TYPE_STRING, {.str="w/2"}, 0, 0, .flags = FLAGS },
48  { "h", "set rect height", OFFSET(h), AV_OPT_TYPE_STRING, {.str="h/2"}, 0, 0, .flags = FLAGS },
49  { "x1", "set 1st rect x top left coordinate", OFFSET(x1), AV_OPT_TYPE_STRING, {.str="w/2"}, 0, 0, .flags = FLAGS },
50  { "y1", "set 1st rect y top left coordinate", OFFSET(y1), AV_OPT_TYPE_STRING, {.str="h/2"}, 0, 0, .flags = FLAGS },
51  { "x2", "set 2nd rect x top left coordinate", OFFSET(x2), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, .flags = FLAGS },
52  { "y2", "set 2nd rect y top left coordinate", OFFSET(y2), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, .flags = FLAGS },
53  { NULL },
54 };
55 
56 AVFILTER_DEFINE_CLASS(swaprect);
57 
58 static int query_formats(AVFilterContext *ctx)
59 {
60  int reject_flags = AV_PIX_FMT_FLAG_PAL |
61  AV_PIX_FMT_FLAG_HWACCEL |
62  AV_PIX_FMT_FLAG_BITSTREAM;
63 
64  return ff_set_common_formats(ctx, ff_formats_pixdesc_filter(0, reject_flags));
65 }
66 
67 static const char *const var_names[] = { "w", "h", "a", "n", "t", "pos", "sar", "dar", NULL };
68 enum { VAR_W, VAR_H, VAR_A, VAR_N, VAR_T, VAR_POS, VAR_SAR, VAR_DAR, VAR_VARS_NB };
69 
70 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
71 {
72  AVFilterContext *ctx = inlink->dst;
73  AVFilterLink *outlink = ctx->outputs[0];
74  SwapRectContext *s = ctx->priv;
75  double var_values[VAR_VARS_NB];
76  int x1[4], y1[4];
77  int x2[4], y2[4];
78  int aw[4], ah[4];
79  int lw[4], lh[4];
80  int pw[4], ph[4];
81  double dw, dh;
82  double dx1, dy1;
83  double dx2, dy2;
84  int y, p, w, h, ret;
85 
86  var_values[VAR_W] = inlink->w;
87  var_values[VAR_H] = inlink->h;
88  var_values[VAR_A] = (float) inlink->w / inlink->h;
89  var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
90  var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR];
91  var_values[VAR_N] = inlink->frame_count_out;
92  var_values[VAR_T] = in->pts == AV_NOPTS_VALUE ? NAN : in->pts * av_q2d(inlink->time_base);
93  var_values[VAR_POS] = in->pkt_pos == -1 ? NAN : in->pkt_pos;
94 
95  ret = av_expr_parse_and_eval(&dw, s->w,
96  var_names, &var_values[0],
97  NULL, NULL, NULL, NULL,
98  0, 0, ctx);
99  if (ret < 0)
100  return ret;
101 
102  ret = av_expr_parse_and_eval(&dh, s->h,
103  var_names, &var_values[0],
104  NULL, NULL, NULL, NULL,
105  0, 0, ctx);
106  if (ret < 0)
107  return ret;
108 
109  ret = av_expr_parse_and_eval(&dx1, s->x1,
110  var_names, &var_values[0],
111  NULL, NULL, NULL, NULL,
112  0, 0, ctx);
113  if (ret < 0)
114  return ret;
115 
116  ret = av_expr_parse_and_eval(&dy1, s->y1,
117  var_names, &var_values[0],
118  NULL, NULL, NULL, NULL,
119  0, 0, ctx);
120  if (ret < 0)
121  return ret;
122 
123  ret = av_expr_parse_and_eval(&dx2, s->x2,
124  var_names, &var_values[0],
125  NULL, NULL, NULL, NULL,
126  0, 0, ctx);
127  if (ret < 0)
128  return ret;
129 
130  ret = av_expr_parse_and_eval(&dy2, s->y2,
131  var_names, &var_values[0],
132  NULL, NULL, NULL, NULL,
133  0, 0, ctx);
134  if (ret < 0)
135  return ret;
136 
137  w = dw; h = dh; x1[0] = dx1; y1[0] = dy1; x2[0] = dx2; y2[0] = dy2;
138 
139  x1[0] = av_clip(x1[0], 0, inlink->w - 1);
140  y1[0] = av_clip(y1[0], 0, inlink->w - 1);
141 
142  x2[0] = av_clip(x2[0], 0, inlink->w - 1);
143  y2[0] = av_clip(y2[0], 0, inlink->w - 1);
144 
145  ah[1] = ah[2] = AV_CEIL_RSHIFT(h, s->desc->log2_chroma_h);
146  ah[0] = ah[3] = h;
147  aw[1] = aw[2] = AV_CEIL_RSHIFT(w, s->desc->log2_chroma_w);
148  aw[0] = aw[3] = w;
149 
150  w = FFMIN3(w, inlink->w - x1[0], inlink->w - x2[0]);
151  h = FFMIN3(h, inlink->h - y1[0], inlink->h - y2[0]);
152 
153  ph[1] = ph[2] = AV_CEIL_RSHIFT(h, s->desc->log2_chroma_h);
154  ph[0] = ph[3] = h;
155  pw[1] = pw[2] = AV_CEIL_RSHIFT(w, s->desc->log2_chroma_w);
156  pw[0] = pw[3] = w;
157 
158  lh[1] = lh[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
159  lh[0] = lh[3] = inlink->h;
160  lw[1] = lw[2] = AV_CEIL_RSHIFT(inlink->w, s->desc->log2_chroma_w);
161  lw[0] = lw[3] = inlink->w;
162 
163  x1[1] = x1[2] = AV_CEIL_RSHIFT(x1[0], s->desc->log2_chroma_w);
164  x1[0] = x1[3] = x1[0];
165  y1[1] = y1[2] = AV_CEIL_RSHIFT(y1[0], s->desc->log2_chroma_h);
166  y1[0] = y1[3] = y1[0];
167 
168  x2[1] = x2[2] = AV_CEIL_RSHIFT(x2[0], s->desc->log2_chroma_w);
169  x2[0] = x2[3] = x2[0];
170  y2[1] = y2[2] = AV_CEIL_RSHIFT(y2[0], s->desc->log2_chroma_h);
171  y2[0] = y2[3] = y2[0];
172 
173  for (p = 0; p < s->nb_planes; p++) {
174  if (ph[p] == ah[p] && pw[p] == aw[p]) {
175  uint8_t *src = in->data[p] + y1[p] * in->linesize[p] + x1[p] * s->pixsteps[p];
176  uint8_t *dst = in->data[p] + y2[p] * in->linesize[p] + x2[p] * s->pixsteps[p];
177 
178  for (y = 0; y < ph[p]; y++) {
179  memcpy(s->temp, src, pw[p] * s->pixsteps[p]);
180  memmove(src, dst, pw[p] * s->pixsteps[p]);
181  memcpy(dst, s->temp, pw[p] * s->pixsteps[p]);
182  src += in->linesize[p];
183  dst += in->linesize[p];
184  }
185  }
186  }
187 
188  return ff_filter_frame(outlink, in);
189 }
190 
191 static int config_input(AVFilterLink *inlink)
192 {
193  AVFilterContext *ctx = inlink->dst;
194  SwapRectContext *s = ctx->priv;
195 
196  if (!s->w || !s->h ||
197  !s->x1 || !s->y1 ||
198  !s->x2 || !s->y2)
199  return AVERROR(EINVAL);
200 
201  s->desc = av_pix_fmt_desc_get(inlink->format);
202  av_image_fill_max_pixsteps(s->pixsteps, NULL, s->desc);
203  s->nb_planes = av_pix_fmt_count_planes(inlink->format);
204 
205  s->temp = av_malloc_array(inlink->w, s->pixsteps[0]);
206  if (!s->temp)
207  return AVERROR(ENOMEM);
208 
209  return 0;
210 }
211 
212 static av_cold void uninit(AVFilterContext *ctx)
213 {
214  SwapRectContext *s = ctx->priv;
215  av_freep(&s->temp);
216 }
217 
218 static const AVFilterPad inputs[] = {
219  {
220  .name = "default",
221  .type = AVMEDIA_TYPE_VIDEO,
222  .flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
223  .filter_frame = filter_frame,
224  .config_props = config_input,
225  },
226 };
227 
228 static const AVFilterPad outputs[] = {
229  {
230  .name = "default",
231  .type = AVMEDIA_TYPE_VIDEO,
232  },
233 };
234 
235 const AVFilter ff_vf_swaprect = {
236  .name = "swaprect",
237  .description = NULL_IF_CONFIG_SMALL("Swap 2 rectangular objects in video."),
238  .priv_size = sizeof(SwapRectContext),
239  .priv_class = &swaprect_class,
240  .uninit = uninit,
241  FILTER_INPUTS(inputs),
242  FILTER_OUTPUTS(outputs),
243  FILTER_QUERY_FUNC(query_formats),
244  .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
245  .process_command = ff_filter_process_command,
246 };
av_clip
#define av_clip
Definition: common.h:96
SwapRectContext::y1
char * y1
Definition: vf_swaprect.c:34
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:45
SwapRectContext::y2
char * y2
Definition: vf_swaprect.c:35
outputs
static const AVFilterPad outputs[]
Definition: vf_swaprect.c:228
SwapRectContext::temp
uint8_t * temp
Definition: vf_swaprect.c:41
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1018
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2660
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:212
SwapRectContext::desc
const AVPixFmtDescriptor * desc
Definition: vf_swaprect.c:40
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:317
AVFrame::pts
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:424
w
uint8_t w
Definition: llviddspenc.c:38
AVOption
AVOption.
Definition: opt.h:247
FILTER_QUERY_FUNC
#define FILTER_QUERY_FUNC(func)
Definition: internal.h:168
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: vf_swaprect.c:58
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:169
video.h
VAR_T
@ VAR_T
Definition: vf_swaprect.c:68
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:338
formats.h
av_pix_fmt_count_planes
int av_pix_fmt_count_planes(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2700
SwapRectContext::pixsteps
int pixsteps[4]
Definition: vf_swaprect.c:38
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:31
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:50
ff_vf_swaprect
const AVFilter ff_vf_swaprect
Definition: vf_swaprect.c:235
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:699
VAR_H
@ VAR_H
Definition: vf_swaprect.c:68
VAR_N
@ VAR_N
Definition: vf_swaprect.c:68
s
#define s(width, name)
Definition: cbs_vp9.c:257
VAR_DAR
@ VAR_DAR
Definition: vf_swaprect.c:68
AV_CEIL_RSHIFT
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:51
AVFrame::pkt_pos
int64_t pkt_pos
reordered pos from the last AVPacket that has been input into the decoder
Definition: frame.h:593
av_q2d
static double av_q2d(AVRational a)
Convert an AVRational to a double.
Definition: rational.h:104
ctx
AVFormatContext * ctx
Definition: movenc.c:48
SwapRectContext::x2
char * x2
Definition: vf_swaprect.c:35
SwapRectContext::h
char * h
Definition: vf_swaprect.c:33
NAN
#define NAN
Definition: mathematics.h:64
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:191
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
NULL
#define NULL
Definition: coverity.c:32
VAR_A
@ VAR_A
Definition: vf_swaprect.c:68
src
#define src
Definition: vp8dsp.c:255
VAR_SAR
@ VAR_SAR
Definition: vf_swaprect.c:68
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:117
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:776
SwapRectContext::w
char * w
Definition: vf_swaprect.c:33
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:882
SwapRectContext::x1
char * x1
Definition: vf_swaprect.c:34
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:146
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:457
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:32
VAR_W
@ VAR_W
Definition: vf_swaprect.c:68
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:56
VAR_VARS_NB
@ VAR_VARS_NB
Definition: vf_swaprect.c:68
AVFilter
Filter definition.
Definition: avfilter.h:165
ret
ret
Definition: filter_design.txt:187
VAR_POS
@ VAR_POS
Definition: vf_swaprect.c:68
OFFSET
#define OFFSET(x)
Definition: vf_swaprect.c:44
swaprect_options
static const AVOption swaprect_options[]
Definition: vf_swaprect.c:46
avfilter.h
SwapRectContext::nb_planes
int nb_planes
Definition: vf_swaprect.c:37
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:402
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
var_names
static const char *const var_names[]
Definition: vf_swaprect.c:67
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:192
inputs
static const AVFilterPad inputs[]
Definition: vf_swaprect.c:218
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:362
h
h
Definition: vp9dsp_template.c:2038
avstring.h
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Definition: opt.h:228
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:70
config_input
static int config_input(AVFilterLink *inlink)
Definition: vf_swaprect.c:191
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:69
Generated on Wed Aug 24 2022 21:38:17 for FFmpeg by   doxygen 1.8.17