FFmpeg
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",
72 #if FF_API_FRAME_PKT
73  "pos",
74 #endif
75  "sar", "dar", NULL };
76 enum { VAR_W, VAR_H, VAR_A, VAR_N, VAR_T,
77 #if FF_API_FRAME_PKT
78  VAR_POS,
79 #endif
80  VAR_SAR, VAR_DAR, VAR_VARS_NB };
81 
82 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
83 {
84  FilterLink *inl = ff_filter_link(inlink);
85  AVFilterContext *ctx = inlink->dst;
86  AVFilterLink *outlink = ctx->outputs[0];
87  SwapRectContext *s = ctx->priv;
88  double var_values[VAR_VARS_NB];
89  int x1[4], y1[4];
90  int x2[4], y2[4];
91  int aw[4], ah[4];
92  int lw[4], lh[4];
93  int pw[4], ph[4];
94  double dw, dh;
95  double dx1, dy1;
96  double dx2, dy2;
97  int y, p, w, h, ret;
98 
99  var_values[VAR_W] = inlink->w;
100  var_values[VAR_H] = inlink->h;
101  var_values[VAR_A] = (float) inlink->w / inlink->h;
102  var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
103  var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR];
104  var_values[VAR_N] = inl->frame_count_out;
105  var_values[VAR_T] = in->pts == AV_NOPTS_VALUE ? NAN : in->pts * av_q2d(inlink->time_base);
106 #if FF_API_FRAME_PKT
107 FF_DISABLE_DEPRECATION_WARNINGS
108  var_values[VAR_POS] = in->pkt_pos == -1 ? NAN : in->pkt_pos;
109 FF_ENABLE_DEPRECATION_WARNINGS
110 #endif
111 
112  ret = av_expr_parse_and_eval(&dw, s->w,
113  var_names, &var_values[0],
114  NULL, NULL, NULL, NULL,
115  0, 0, ctx);
116  if (ret < 0)
117  return ret;
118 
119  ret = av_expr_parse_and_eval(&dh, s->h,
120  var_names, &var_values[0],
121  NULL, NULL, NULL, NULL,
122  0, 0, ctx);
123  if (ret < 0)
124  return ret;
125 
126  ret = av_expr_parse_and_eval(&dx1, s->x1,
127  var_names, &var_values[0],
128  NULL, NULL, NULL, NULL,
129  0, 0, ctx);
130  if (ret < 0)
131  return ret;
132 
133  ret = av_expr_parse_and_eval(&dy1, s->y1,
134  var_names, &var_values[0],
135  NULL, NULL, NULL, NULL,
136  0, 0, ctx);
137  if (ret < 0)
138  return ret;
139 
140  ret = av_expr_parse_and_eval(&dx2, s->x2,
141  var_names, &var_values[0],
142  NULL, NULL, NULL, NULL,
143  0, 0, ctx);
144  if (ret < 0)
145  return ret;
146 
147  ret = av_expr_parse_and_eval(&dy2, s->y2,
148  var_names, &var_values[0],
149  NULL, NULL, NULL, NULL,
150  0, 0, ctx);
151  if (ret < 0)
152  return ret;
153 
154  w = dw; h = dh; x1[0] = dx1; y1[0] = dy1; x2[0] = dx2; y2[0] = dy2;
155 
156  x1[0] = av_clip(x1[0], 0, inlink->w - 1);
157  y1[0] = av_clip(y1[0], 0, inlink->h - 1);
158 
159  x2[0] = av_clip(x2[0], 0, inlink->w - 1);
160  y2[0] = av_clip(y2[0], 0, inlink->h - 1);
161 
162  ah[1] = ah[2] = AV_CEIL_RSHIFT(h, s->desc->log2_chroma_h);
163  ah[0] = ah[3] = h;
164  aw[1] = aw[2] = AV_CEIL_RSHIFT(w, s->desc->log2_chroma_w);
165  aw[0] = aw[3] = w;
166 
167  w = FFMIN3(w, inlink->w - x1[0], inlink->w - x2[0]);
168  h = FFMIN3(h, inlink->h - y1[0], inlink->h - y2[0]);
169 
170  ph[1] = ph[2] = AV_CEIL_RSHIFT(h, s->desc->log2_chroma_h);
171  ph[0] = ph[3] = h;
172  pw[1] = pw[2] = AV_CEIL_RSHIFT(w, s->desc->log2_chroma_w);
173  pw[0] = pw[3] = w;
174 
175  lh[1] = lh[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
176  lh[0] = lh[3] = inlink->h;
177  lw[1] = lw[2] = AV_CEIL_RSHIFT(inlink->w, s->desc->log2_chroma_w);
178  lw[0] = lw[3] = inlink->w;
179 
180  x1[1] = x1[2] = (x1[0] >> s->desc->log2_chroma_w);
181  x1[0] = x1[3] = x1[0];
182  y1[1] = y1[2] = (y1[0] >> s->desc->log2_chroma_h);
183  y1[0] = y1[3] = y1[0];
184 
185  x2[1] = x2[2] = (x2[0] >> s->desc->log2_chroma_w);
186  x2[0] = x2[3] = x2[0];
187  y2[1] = y2[2] = (y2[0] >> s->desc->log2_chroma_h);
188  y2[0] = y2[3] = y2[0];
189 
190 
191  av_assert0(FFMAX(x1[1], x2[1]) + pw[1] <= lw[1]);
192  av_assert0(FFMAX(y1[1], y2[1]) + ph[1] <= lh[1]);
193 
194  for (p = 0; p < s->nb_planes; p++) {
195  if (ph[p] == ah[p] && pw[p] == aw[p]) {
196  uint8_t *src = in->data[p] + y1[p] * in->linesize[p] + x1[p] * s->pixsteps[p];
197  uint8_t *dst = in->data[p] + y2[p] * in->linesize[p] + x2[p] * s->pixsteps[p];
198 
199  for (y = 0; y < ph[p]; y++) {
200  memcpy(s->temp, src, pw[p] * s->pixsteps[p]);
201  memmove(src, dst, pw[p] * s->pixsteps[p]);
202  memcpy(dst, s->temp, pw[p] * s->pixsteps[p]);
203  src += in->linesize[p];
204  dst += in->linesize[p];
205  }
206  }
207  }
208 
209  return ff_filter_frame(outlink, in);
210 }
211 
212 static int config_input(AVFilterLink *inlink)
213 {
214  AVFilterContext *ctx = inlink->dst;
215  SwapRectContext *s = ctx->priv;
216 
217  if (!s->w || !s->h ||
218  !s->x1 || !s->y1 ||
219  !s->x2 || !s->y2)
220  return AVERROR(EINVAL);
221 
222  s->desc = av_pix_fmt_desc_get(inlink->format);
223  av_image_fill_max_pixsteps(s->pixsteps, NULL, s->desc);
224  s->nb_planes = av_pix_fmt_count_planes(inlink->format);
225 
226  s->temp = av_malloc_array(inlink->w, s->pixsteps[0]);
227  if (!s->temp)
228  return AVERROR(ENOMEM);
229 
230  return 0;
231 }
232 
233 static av_cold void uninit(AVFilterContext *ctx)
234 {
235  SwapRectContext *s = ctx->priv;
236  av_freep(&s->temp);
237 }
238 
239 static const AVFilterPad inputs[] = {
240  {
241  .name = "default",
242  .type = AVMEDIA_TYPE_VIDEO,
243  .flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
244  .filter_frame = filter_frame,
245  .config_props = config_input,
246  },
247 };
248 
249 const AVFilter ff_vf_swaprect = {
250  .name = "swaprect",
251  .description = NULL_IF_CONFIG_SMALL("Swap 2 rectangular objects in video."),
252  .priv_size = sizeof(SwapRectContext),
253  .priv_class = &swaprect_class,
254  .uninit = uninit,
255  FILTER_INPUTS(inputs),
256  FILTER_OUTPUTS(ff_video_default_filterpad),
257  FILTER_QUERY_FUNC2(query_formats),
258  .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
259  .process_command = ff_filter_process_command,
260 };
FF_ENABLE_DEPRECATION_WARNINGS
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:73
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:1061
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:3170
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:233
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:403
AVFrame::pts
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:515
w
uint8_t w
Definition: llviddspenc.c:38
VAR_T
@ VAR_T
Definition: vf_swaprect.c:76
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:205
video.h
query_formats
static int query_formats(const AVFilterContext *ctx, AVFilterFormatsConfig **cfg_in, AVFilterFormatsConfig **cfg_out)
Definition: vf_swaprect.c:59
VAR_N
@ VAR_N
Definition: vf_swaprect.c:76
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:424
formats.h
av_pix_fmt_count_planes
int av_pix_fmt_count_planes(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:3210
SwapRectContext::pixsteps
int pixsteps[4]
Definition: vf_swaprect.c:39
VAR_DAR
@ VAR_DAR
Definition: vf_swaprect.c:80
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
avassert.h
ff_vf_swaprect
const AVFilter ff_vf_swaprect
Definition: vf_swaprect.c:249
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
float
float
Definition: af_crystalizer.c:122
s
#define s(width, name)
Definition: cbs_vp9.c:198
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
VAR_VARS_NB
@ VAR_VARS_NB
Definition: vf_swaprect.c:80
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:75
VAR_H
@ VAR_H
Definition: vf_swaprect.c:76
NULL
#define NULL
Definition: coverity.c:32
VAR_POS
@ VAR_POS
Definition: noise.c:56
AVFilterFormatsConfig
Lists of formats / etc.
Definition: avfilter.h:111
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:803
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
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:713
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_W
@ VAR_W
Definition: vf_swaprect.c:76
VAR_SAR
@ VAR_SAR
Definition: vf_swaprect.c:80
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:182
VAR_A
@ VAR_A
Definition: vf_swaprect.c:76
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)
FFMIN3
#define FFMIN3(a, b, c)
Definition: macros.h:50
av_malloc_array
#define av_malloc_array(a, b)
Definition: tableprint_vlc.h:31
FILTER_QUERY_FUNC2
#define FILTER_QUERY_FUNC2(func)
Definition: filters.h:239
AVFilterPad::name
const char * name
Pad name.
Definition: filters.h:44
AVFilter
Filter definition.
Definition: avfilter.h:201
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
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:457
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: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:239
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
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:448
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:82
config_input
static int config_input(AVFilterLink *inlink)
Definition: vf_swaprect.c:212
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