FFmpeg
vf_pad.c
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1 /*
2  * Copyright (c) 2008 vmrsss
3  * Copyright (c) 2009 Stefano Sabatini
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * video padding filter
25  */
26 
27 #include <float.h> /* DBL_MAX */
28 
29 #include "avfilter.h"
30 #include "formats.h"
31 #include "internal.h"
32 #include "video.h"
33 #include "libavutil/avstring.h"
34 #include "libavutil/common.h"
35 #include "libavutil/eval.h"
36 #include "libavutil/pixdesc.h"
37 #include "libavutil/colorspace.h"
38 #include "libavutil/imgutils.h"
39 #include "libavutil/parseutils.h"
40 #include "libavutil/mathematics.h"
41 #include "libavutil/opt.h"
42 
43 #include "drawutils.h"
44 
45 static const char *const var_names[] = {
46  "in_w", "iw",
47  "in_h", "ih",
48  "out_w", "ow",
49  "out_h", "oh",
50  "x",
51  "y",
52  "a",
53  "sar",
54  "dar",
55  "hsub",
56  "vsub",
57  NULL
58 };
59 
60 enum var_name {
73 };
74 
76 {
78 }
79 
80 enum EvalMode {
84 };
85 
86 typedef struct PadContext {
87  const AVClass *class;
88  int w, h; ///< output dimensions, a value of 0 will result in the input size
89  int x, y; ///< offsets of the input area with respect to the padded area
90  int in_w, in_h; ///< width and height for the padded input video, which has to be aligned to the chroma values in order to avoid chroma issues
93 
94  char *w_expr; ///< width expression string
95  char *h_expr; ///< height expression string
96  char *x_expr; ///< width expression string
97  char *y_expr; ///< height expression string
98  uint8_t rgba_color[4]; ///< color for the padding area
101 
102  int eval_mode; ///< expression evaluation mode
103 } PadContext;
104 
106 {
107  AVFilterContext *ctx = inlink->dst;
108  PadContext *s = ctx->priv;
109  AVRational adjusted_aspect = s->aspect;
110  int ret;
111  double var_values[VARS_NB], res;
112  char *expr;
113 
114  ff_draw_init(&s->draw, inlink->format, 0);
115  ff_draw_color(&s->draw, &s->color, s->rgba_color);
116 
117  var_values[VAR_IN_W] = var_values[VAR_IW] = inlink->w;
118  var_values[VAR_IN_H] = var_values[VAR_IH] = inlink->h;
119  var_values[VAR_OUT_W] = var_values[VAR_OW] = NAN;
120  var_values[VAR_OUT_H] = var_values[VAR_OH] = NAN;
121  var_values[VAR_A] = (double) inlink->w / inlink->h;
122  var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?
123  (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
124  var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR];
125  var_values[VAR_HSUB] = 1 << s->draw.hsub_max;
126  var_values[VAR_VSUB] = 1 << s->draw.vsub_max;
127 
128  /* evaluate width and height */
129  av_expr_parse_and_eval(&res, (expr = s->w_expr),
130  var_names, var_values,
131  NULL, NULL, NULL, NULL, NULL, 0, ctx);
132  s->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;
133  if ((ret = av_expr_parse_and_eval(&res, (expr = s->h_expr),
134  var_names, var_values,
135  NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
136  goto eval_fail;
137  s->h = var_values[VAR_OUT_H] = var_values[VAR_OH] = res;
138  if (!s->h)
139  var_values[VAR_OUT_H] = var_values[VAR_OH] = s->h = inlink->h;
140 
141  /* evaluate the width again, as it may depend on the evaluated output height */
142  if ((ret = av_expr_parse_and_eval(&res, (expr = s->w_expr),
143  var_names, var_values,
144  NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
145  goto eval_fail;
146  s->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;
147  if (!s->w)
148  var_values[VAR_OUT_W] = var_values[VAR_OW] = s->w = inlink->w;
149 
150  if (adjusted_aspect.num && adjusted_aspect.den) {
151  adjusted_aspect = av_div_q(adjusted_aspect, inlink->sample_aspect_ratio);
152  if (s->h < av_rescale(s->w, adjusted_aspect.den, adjusted_aspect.num)) {
153  s->h = var_values[VAR_OUT_H] = var_values[VAR_OH] = av_rescale(s->w, adjusted_aspect.den, adjusted_aspect.num);
154  } else {
155  s->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = av_rescale(s->h, adjusted_aspect.num, adjusted_aspect.den);
156  }
157  }
158 
159  /* evaluate x and y */
160  av_expr_parse_and_eval(&res, (expr = s->x_expr),
161  var_names, var_values,
162  NULL, NULL, NULL, NULL, NULL, 0, ctx);
163  s->x = var_values[VAR_X] = res;
164  if ((ret = av_expr_parse_and_eval(&res, (expr = s->y_expr),
165  var_names, var_values,
166  NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
167  goto eval_fail;
168  s->y = var_values[VAR_Y] = res;
169  /* evaluate x again, as it may depend on the evaluated y value */
170  if ((ret = av_expr_parse_and_eval(&res, (expr = s->x_expr),
171  var_names, var_values,
172  NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
173  goto eval_fail;
174  s->x = var_values[VAR_X] = res;
175 
176  if (s->x < 0 || s->x + inlink->w > s->w)
177  s->x = var_values[VAR_X] = (s->w - inlink->w) / 2;
178  if (s->y < 0 || s->y + inlink->h > s->h)
179  s->y = var_values[VAR_Y] = (s->h - inlink->h) / 2;
180 
181  s->w = ff_draw_round_to_sub(&s->draw, 0, -1, s->w);
182  s->h = ff_draw_round_to_sub(&s->draw, 1, -1, s->h);
183  /* sanity check params */
184  if (s->w < inlink->w || s->h < inlink->h) {
185  av_log(ctx, AV_LOG_ERROR, "Padded dimensions cannot be smaller than input dimensions.\n");
186  return AVERROR(EINVAL);
187  }
188 
189  s->x = ff_draw_round_to_sub(&s->draw, 0, -1, s->x);
190  s->y = ff_draw_round_to_sub(&s->draw, 1, -1, s->y);
191  s->in_w = ff_draw_round_to_sub(&s->draw, 0, -1, inlink->w);
192  s->in_h = ff_draw_round_to_sub(&s->draw, 1, -1, inlink->h);
193  s->inlink_w = inlink->w;
194  s->inlink_h = inlink->h;
195 
196  av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d -> w:%d h:%d x:%d y:%d color:0x%02X%02X%02X%02X\n",
197  inlink->w, inlink->h, s->w, s->h, s->x, s->y,
198  s->rgba_color[0], s->rgba_color[1], s->rgba_color[2], s->rgba_color[3]);
199 
200  if (s->x < 0 || s->y < 0 ||
201  s->w <= 0 || s->h <= 0 ||
202  (unsigned)s->x + (unsigned)inlink->w > s->w ||
203  (unsigned)s->y + (unsigned)inlink->h > s->h) {
205  "Input area %d:%d:%d:%d not within the padded area 0:0:%d:%d or zero-sized\n",
206  s->x, s->y, s->x + inlink->w, s->y + inlink->h, s->w, s->h);
207  return AVERROR(EINVAL);
208  }
209 
210  return 0;
211 
212 eval_fail:
214  "Error when evaluating the expression '%s'\n", expr);
215  return ret;
216 
217 }
218 
219 static int config_output(AVFilterLink *outlink)
220 {
221  PadContext *s = outlink->src->priv;
222 
223  outlink->w = s->w;
224  outlink->h = s->h;
225  return 0;
226 }
227 
229 {
230  PadContext *s = inlink->dst->priv;
231  AVFrame *frame;
232  int plane;
233 
234  if (s->inlink_w <= 0)
235  return NULL;
236 
237  frame = ff_get_video_buffer(inlink->dst->outputs[0],
238  w + (s->w - s->in_w),
239  h + (s->h - s->in_h) + (s->x > 0));
240 
241  if (!frame)
242  return NULL;
243 
244  frame->width = w;
245  frame->height = h;
246 
247  for (plane = 0; plane < 4 && frame->data[plane] && frame->linesize[plane]; plane++) {
248  int hsub = s->draw.hsub[plane];
249  int vsub = s->draw.vsub[plane];
250  frame->data[plane] += (s->x >> hsub) * s->draw.pixelstep[plane] +
251  (s->y >> vsub) * frame->linesize[plane];
252  }
253 
254  return frame;
255 }
256 
257 /* check whether each plane in this buffer can be padded without copying */
259 {
260  int planes[4] = { -1, -1, -1, -1}, *p = planes;
261  int i, j;
262 
263  /* get all planes in this buffer */
264  for (i = 0; i < FF_ARRAY_ELEMS(planes) && frame->data[i]; i++) {
265  if (av_frame_get_plane_buffer(frame, i) == buf)
266  *p++ = i;
267  }
268 
269  /* for each plane in this buffer, check that it can be padded without
270  * going over buffer bounds or other planes */
271  for (i = 0; i < FF_ARRAY_ELEMS(planes) && planes[i] >= 0; i++) {
272  int hsub = s->draw.hsub[planes[i]];
273  int vsub = s->draw.vsub[planes[i]];
274 
275  uint8_t *start = frame->data[planes[i]];
276  uint8_t *end = start + (frame->height >> vsub) *
277  frame->linesize[planes[i]];
278 
279  /* amount of free space needed before the start and after the end
280  * of the plane */
281  ptrdiff_t req_start = (s->x >> hsub) * s->draw.pixelstep[planes[i]] +
282  (s->y >> vsub) * frame->linesize[planes[i]];
283  ptrdiff_t req_end = ((s->w - s->x - frame->width) >> hsub) *
284  s->draw.pixelstep[planes[i]] +
285  ((s->h - s->y - frame->height) >> vsub) * frame->linesize[planes[i]];
286 
287  if (frame->linesize[planes[i]] < (s->w >> hsub) * s->draw.pixelstep[planes[i]])
288  return 1;
289  if (start - buf->data < req_start ||
290  (buf->data + buf->size) - end < req_end)
291  return 1;
292 
293  for (j = 0; j < FF_ARRAY_ELEMS(planes) && planes[j] >= 0; j++) {
294  int vsub1 = s->draw.vsub[planes[j]];
295  uint8_t *start1 = frame->data[planes[j]];
296  uint8_t *end1 = start1 + (frame->height >> vsub1) *
297  frame->linesize[planes[j]];
298  if (i == j)
299  continue;
300 
301  if (FFSIGN(start - end1) != FFSIGN(start - end1 - req_start) ||
302  FFSIGN(end - start1) != FFSIGN(end - start1 + req_end))
303  return 1;
304  }
305  }
306 
307  return 0;
308 }
309 
311 {
312  int i;
313 
315  return 1;
316 
317  for (i = 0; i < 4 && frame->buf[i]; i++)
318  if (buffer_needs_copy(s, frame, frame->buf[i]))
319  return 1;
320  return 0;
321 }
322 
324 {
325  PadContext *s = inlink->dst->priv;
326  AVFilterLink *outlink = inlink->dst->outputs[0];
327  AVFrame *out;
328  int needs_copy;
329  if(s->eval_mode == EVAL_MODE_FRAME && (
330  in->width != s->inlink_w
331  || in->height != s->inlink_h
332  || in->format != outlink->format
334  int ret;
335 
336  inlink->dst->inputs[0]->format = in->format;
337  inlink->dst->inputs[0]->w = in->width;
338  inlink->dst->inputs[0]->h = in->height;
339 
340  inlink->dst->inputs[0]->sample_aspect_ratio.den = in->sample_aspect_ratio.den;
341  inlink->dst->inputs[0]->sample_aspect_ratio.num = in->sample_aspect_ratio.num;
342 
343 
344  if ((ret = config_input(inlink)) < 0) {
345  s->inlink_w = -1;
346  return ret;
347  }
348  if ((ret = config_output(outlink)) < 0) {
349  s->inlink_w = -1;
350  return ret;
351  }
352  }
353 
354  needs_copy = frame_needs_copy(s, in);
355 
356  if (needs_copy) {
357  av_log(inlink->dst, AV_LOG_DEBUG, "Direct padding impossible allocating new frame\n");
358  out = ff_get_video_buffer(inlink->dst->outputs[0],
359  FFMAX(inlink->w, s->w),
360  FFMAX(inlink->h, s->h));
361  if (!out) {
362  av_frame_free(&in);
363  return AVERROR(ENOMEM);
364  }
365 
367  } else {
368  int i;
369 
370  out = in;
371  for (i = 0; i < 4 && out->data[i] && out->linesize[i]; i++) {
372  int hsub = s->draw.hsub[i];
373  int vsub = s->draw.vsub[i];
374  out->data[i] -= (s->x >> hsub) * s->draw.pixelstep[i] +
375  (s->y >> vsub) * out->linesize[i];
376  }
377  }
378 
379  /* top bar */
380  if (s->y) {
381  ff_fill_rectangle(&s->draw, &s->color,
382  out->data, out->linesize,
383  0, 0, s->w, s->y);
384  }
385 
386  /* bottom bar */
387  if (s->h > s->y + s->in_h) {
388  ff_fill_rectangle(&s->draw, &s->color,
389  out->data, out->linesize,
390  0, s->y + s->in_h, s->w, s->h - s->y - s->in_h);
391  }
392 
393  /* left border */
394  ff_fill_rectangle(&s->draw, &s->color, out->data, out->linesize,
395  0, s->y, s->x, in->height);
396 
397  if (needs_copy) {
398  ff_copy_rectangle2(&s->draw,
399  out->data, out->linesize, in->data, in->linesize,
400  s->x, s->y, 0, 0, in->width, in->height);
401  }
402 
403  /* right border */
404  ff_fill_rectangle(&s->draw, &s->color, out->data, out->linesize,
405  s->x + s->in_w, s->y, s->w - s->x - s->in_w,
406  in->height);
407 
408  out->width = s->w;
409  out->height = s->h;
410 
411  if (in != out)
412  av_frame_free(&in);
413  return ff_filter_frame(inlink->dst->outputs[0], out);
414 }
415 
416 #define OFFSET(x) offsetof(PadContext, x)
417 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
418 
419 static const AVOption pad_options[] = {
420  { "width", "set the pad area width expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, 0, 0, FLAGS },
421  { "w", "set the pad area width expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, 0, 0, FLAGS },
422  { "height", "set the pad area height expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, 0, 0, FLAGS },
423  { "h", "set the pad area height expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, 0, 0, FLAGS },
424  { "x", "set the x offset expression for the input image position", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "0"}, 0, 0, FLAGS },
425  { "y", "set the y offset expression for the input image position", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "0"}, 0, 0, FLAGS },
426  { "color", "set the color of the padded area border", OFFSET(rgba_color), AV_OPT_TYPE_COLOR, {.str = "black"}, .flags = FLAGS },
427  { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
428  { "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
429  { "frame", "eval expressions during initialization and per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
430  { "aspect", "pad to fit an aspect instead of a resolution", OFFSET(aspect), AV_OPT_TYPE_RATIONAL, {.dbl = 0}, 0, DBL_MAX, FLAGS },
431  { NULL }
432 };
433 
435 
437  {
438  .name = "default",
439  .type = AVMEDIA_TYPE_VIDEO,
440  .config_props = config_input,
441  .get_buffer.video = get_video_buffer,
442  .filter_frame = filter_frame,
443  },
444 };
445 
447  {
448  .name = "default",
449  .type = AVMEDIA_TYPE_VIDEO,
450  .config_props = config_output,
451  },
452 };
453 
455  .name = "pad",
456  .description = NULL_IF_CONFIG_SMALL("Pad the input video."),
457  .priv_size = sizeof(PadContext),
458  .priv_class = &pad_class,
462 };
ff_get_video_buffer
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
Definition: video.c:98
VAR_IN_W
@ VAR_IN_W
Definition: vf_pad.c:61
FFDrawColor
Definition: drawutils.h:49
VAR_Y
@ VAR_Y
Definition: vf_pad.c:66
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
PadContext::w_expr
char * w_expr
width expression string
Definition: vf_pad.c:94
PadContext::eval_mode
int eval_mode
expression evaluation mode
Definition: vf_pad.c:102
out
FILE * out
Definition: movenc.c:54
PadContext::y
int y
offsets of the input area with respect to the padded area
Definition: vf_pad.c:89
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1018
AVBufferRef::data
uint8_t * data
The data buffer.
Definition: buffer.h:90
PadContext::y_expr
char * y_expr
height expression string
Definition: vf_pad.c:97
av_div_q
AVRational av_div_q(AVRational b, AVRational c)
Divide one rational by another.
Definition: rational.c:88
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
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:112
get_video_buffer
static AVFrame * get_video_buffer(AVFilterLink *inlink, int w, int h)
Definition: vf_pad.c:228
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:310
pixdesc.h
AVFrame::width
int width
Definition: frame.h:380
w
uint8_t w
Definition: llviddspenc.c:38
VAR_HSUB
@ VAR_HSUB
Definition: vf_pad.c:70
AVOption
AVOption.
Definition: opt.h:247
FILTER_QUERY_FUNC
#define FILTER_QUERY_FUNC(func)
Definition: internal.h:168
var_names
static const char *const var_names[]
Definition: vf_pad.c:45
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: vf_pad.c:323
AV_LOG_VERBOSE
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:196
float.h
mathematics.h
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:153
AV_OPT_TYPE_RATIONAL
@ AV_OPT_TYPE_RATIONAL
Definition: opt.h:229
video.h
avfilter_vf_pad_outputs
static const AVFilterPad avfilter_vf_pad_outputs[]
Definition: vf_pad.c:446
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:329
hsub
static void hsub(htype *dst, const htype *src, int bins)
Definition: vf_median.c:74
formats.h
ff_vf_pad
const AVFilter ff_vf_pad
Definition: vf_pad.c:454
PadContext::w
int w
Definition: vf_pad.c:88
AVFilterContext::priv
void * priv
private data for use by the filter
Definition: avfilter.h:401
FFSIGN
#define FFSIGN(a)
Definition: common.h:66
VAR_SAR
@ VAR_SAR
Definition: vf_pad.c:68
EVAL_MODE_INIT
@ EVAL_MODE_INIT
Definition: vf_pad.c:81
AVRational::num
int num
Numerator.
Definition: rational.h:59
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:50
config_output
static int config_output(AVFilterLink *outlink)
Definition: vf_pad.c:219
colorspace.h
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
FF_ARRAY_ELEMS
#define FF_ARRAY_ELEMS(a)
Definition: sinewin_tablegen.c:29
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
s
#define s(width, name)
Definition: cbs_vp9.c:257
ff_copy_rectangle2
void ff_copy_rectangle2(FFDrawContext *draw, uint8_t *dst[], int dst_linesize[], uint8_t *src[], int src_linesize[], int dst_x, int dst_y, int src_x, int src_y, int w, int h)
Copy a rectangle from an image to another.
Definition: drawutils.c:200
config_input
static int config_input(AVFilterLink *inlink)
Definition: vf_pad.c:105
PadContext
Definition: vf_pad.c:86
var_name
var_name
Definition: noise_bsf.c:47
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:201
ctx
AVFormatContext * ctx
Definition: movenc.c:48
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(pad)
ff_draw_init
int ff_draw_init(FFDrawContext *draw, enum AVPixelFormat format, unsigned flags)
Init a draw context.
Definition: drawutils.c:82
NAN
#define NAN
Definition: mathematics.h:64
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:191
PadContext::h
int h
output dimensions, a value of 0 will result in the input size
Definition: vf_pad.c:88
planes
static const struct @321 planes[]
if
if(ret)
Definition: filter_design.txt:179
OFFSET
#define OFFSET(x)
Definition: vf_pad.c:416
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
VAR_DAR
@ VAR_DAR
Definition: vf_pad.c:69
NULL
#define NULL
Definition: coverity.c:32
av_frame_copy_props
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
Definition: frame.c:537
VAR_OUT_W
@ VAR_OUT_W
Definition: vf_pad.c:63
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
AV_OPT_TYPE_COLOR
@ AV_OPT_TYPE_COLOR
Definition: opt.h:239
parseutils.h
avfilter_vf_pad_inputs
static const AVFilterPad avfilter_vf_pad_inputs[]
Definition: vf_pad.c:436
VAR_OW
@ VAR_OW
Definition: vf_pad.c:63
VAR_OH
@ VAR_OH
Definition: vf_pad.c:64
EVAL_MODE_FRAME
@ EVAL_MODE_FRAME
Definition: vf_pad.c:82
VAR_OUT_H
@ VAR_OUT_H
Definition: vf_pad.c:64
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
EVAL_MODE_NB
@ EVAL_MODE_NB
Definition: vf_pad.c:83
pad_options
static const AVOption pad_options[]
Definition: vf_pad.c:419
ff_fill_rectangle
void ff_fill_rectangle(FFDrawContext *draw, FFDrawColor *color, uint8_t *dst[], int dst_linesize[], int dst_x, int dst_y, int w, int h)
Fill a rectangle with an uniform color.
Definition: drawutils.c:222
av_frame_is_writable
int av_frame_is_writable(AVFrame *frame)
Check if the frame data is writable.
Definition: frame.c:473
AVFrame::format
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames,...
Definition: frame.h:395
PadContext::h_expr
char * h_expr
height expression string
Definition: vf_pad.c:95
VARS_NB
@ VARS_NB
Definition: vf_pad.c:72
PadContext::x_expr
char * x_expr
width expression string
Definition: vf_pad.c:96
PadContext::inlink_w
int inlink_w
Definition: vf_pad.c:91
PadContext::x
int x
Definition: vf_pad.c:89
frame_needs_copy
static int frame_needs_copy(PadContext *s, AVFrame *frame)
Definition: vf_pad.c:310
AVBufferRef::size
size_t size
Size of data in bytes.
Definition: buffer.h:94
VAR_A
@ VAR_A
Definition: vf_pad.c:67
internal.h
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
ff_draw_supported_pixel_formats
AVFilterFormats * ff_draw_supported_pixel_formats(unsigned flags)
Return the list of pixel formats supported by the draw functions.
Definition: drawutils.c:635
buffer_needs_copy
static int buffer_needs_copy(PadContext *s, AVFrame *frame, AVBufferRef *buf)
Definition: vf_pad.c:258
common.h
EvalMode
EvalMode
Definition: af_volume.h:39
VAR_IH
@ VAR_IH
Definition: vf_pad.c:62
ff_draw_round_to_sub
int ff_draw_round_to_sub(FFDrawContext *draw, int sub_dir, int round_dir, int value)
Round a dimension according to subsampling.
Definition: drawutils.c:623
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: vf_pad.c:75
FFDrawContext
Definition: drawutils.h:35
VAR_X
@ VAR_X
Definition: vf_pad.c:65
VAR_IN_H
@ VAR_IN_H
Definition: vf_pad.c:62
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:56
av_rescale
int64_t av_rescale(int64_t a, int64_t b, int64_t c)
Rescale a 64-bit integer with rounding to nearest.
Definition: mathematics.c:128
PadContext::draw
FFDrawContext draw
Definition: vf_pad.c:99
ff_draw_color
void ff_draw_color(FFDrawContext *draw, FFDrawColor *color, const uint8_t rgba[4])
Prepare a color.
Definition: drawutils.c:135
AVFilter
Filter definition.
Definition: avfilter.h:149
PadContext::color
FFDrawColor color
Definition: vf_pad.c:100
PadContext::in_w
int in_w
Definition: vf_pad.c:90
ret
ret
Definition: filter_design.txt:187
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
AVFrame::sample_aspect_ratio
AVRational sample_aspect_ratio
Sample aspect ratio for the video frame, 0/1 if unknown/unspecified.
Definition: frame.h:410
AVFrame::height
int height
Definition: frame.h:380
PadContext::aspect
AVRational aspect
Definition: vf_pad.c:92
PadContext::rgba_color
uint8_t rgba_color[4]
color for the padding area
Definition: vf_pad.c:98
AVRational::den
int den
Denominator.
Definition: rational.h:60
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:224
avfilter.h
AVFilterContext
An instance of a filter.
Definition: avfilter.h:386
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
FLAGS
#define FLAGS
Definition: vf_pad.c:417
AVBufferRef
A reference to a data buffer.
Definition: buffer.h:82
PadContext::in_h
int in_h
width and height for the padded input video, which has to be aligned to the chroma values in order to...
Definition: vf_pad.c:90
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:192
PadContext::inlink_h
int inlink_h
Definition: vf_pad.c:91
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:353
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
av_frame_get_plane_buffer
AVBufferRef * av_frame_get_plane_buffer(AVFrame *frame, int plane)
Get the buffer reference a given data plane is stored in.
Definition: frame.c:542
h
h
Definition: vp9dsp_template.c:2038
avstring.h
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Definition: opt.h:228
drawutils.h
AV_OPT_TYPE_CONST
@ AV_OPT_TYPE_CONST
Definition: opt.h:233
VAR_VSUB
@ VAR_VSUB
Definition: vf_pad.c:71
VAR_IW
@ VAR_IW
Definition: vf_pad.c:61