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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 
105 static int config_input(AVFilterLink *inlink)
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  /* sanity check params */
182  if (s->w < 0 || s->h < 0) {
183  av_log(ctx, AV_LOG_ERROR, "Negative values are not acceptable.\n");
184  return AVERROR(EINVAL);
185  }
186 
187  s->w = ff_draw_round_to_sub(&s->draw, 0, -1, s->w);
188  s->h = ff_draw_round_to_sub(&s->draw, 1, -1, s->h);
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->w <= 0 || s->h <= 0) {
201  av_log(ctx, AV_LOG_ERROR,
202  "Input area %d:%d:%d:%d not within the padded area 0:0:%d:%d or zero-sized\n",
203  s->x, s->y, s->x + inlink->w, s->y + inlink->h, s->w, s->h);
204  return AVERROR(EINVAL);
205  }
206 
207  return 0;
208 
209 eval_fail:
211  "Error when evaluating the expression '%s'\n", expr);
212  return ret;
213 
214 }
215 
216 static int config_output(AVFilterLink *outlink)
217 {
218  PadContext *s = outlink->src->priv;
219 
220  outlink->w = s->w;
221  outlink->h = s->h;
222  return 0;
223 }
224 
225 static AVFrame *get_video_buffer(AVFilterLink *inlink, int w, int h)
226 {
227  PadContext *s = inlink->dst->priv;
228  AVFrame *frame;
229  int plane;
230 
231  if (s->inlink_w <= 0)
232  return NULL;
233 
234  frame = ff_get_video_buffer(inlink->dst->outputs[0],
235  w + (s->w - s->in_w),
236  h + (s->h - s->in_h) + (s->x > 0));
237 
238  if (!frame)
239  return NULL;
240 
241  frame->width = w;
242  frame->height = h;
243 
244  for (plane = 0; plane < 4 && frame->data[plane] && frame->linesize[plane]; plane++) {
245  int hsub = s->draw.hsub[plane];
246  int vsub = s->draw.vsub[plane];
247  frame->data[plane] += (s->x >> hsub) * s->draw.pixelstep[plane] +
248  (s->y >> vsub) * frame->linesize[plane];
249  }
250 
251  return frame;
252 }
253 
254 /* check whether each plane in this buffer can be padded without copying */
256 {
257  int planes[4] = { -1, -1, -1, -1}, *p = planes;
258  int i, j;
259 
260  /* get all planes in this buffer */
261  for (i = 0; i < FF_ARRAY_ELEMS(planes) && frame->data[i]; i++) {
262  if (av_frame_get_plane_buffer(frame, i) == buf)
263  *p++ = i;
264  }
265 
266  /* for each plane in this buffer, check that it can be padded without
267  * going over buffer bounds or other planes */
268  for (i = 0; i < FF_ARRAY_ELEMS(planes) && planes[i] >= 0; i++) {
269  int hsub = s->draw.hsub[planes[i]];
270  int vsub = s->draw.vsub[planes[i]];
271 
272  uint8_t *start = frame->data[planes[i]];
273  uint8_t *end = start + (frame->height >> vsub) *
274  frame->linesize[planes[i]];
275 
276  /* amount of free space needed before the start and after the end
277  * of the plane */
278  ptrdiff_t req_start = (s->x >> hsub) * s->draw.pixelstep[planes[i]] +
279  (s->y >> vsub) * frame->linesize[planes[i]];
280  ptrdiff_t req_end = ((s->w - s->x - frame->width) >> hsub) *
281  s->draw.pixelstep[planes[i]] +
282  ((s->h - s->y - frame->height) >> vsub) * frame->linesize[planes[i]];
283 
284  if (frame->linesize[planes[i]] < (s->w >> hsub) * s->draw.pixelstep[planes[i]])
285  return 1;
286  if (start - buf->data < req_start ||
287  (buf->data + buf->size) - end < req_end)
288  return 1;
289 
290  for (j = 0; j < FF_ARRAY_ELEMS(planes) && planes[j] >= 0; j++) {
291  int vsub1 = s->draw.vsub[planes[j]];
292  uint8_t *start1 = frame->data[planes[j]];
293  uint8_t *end1 = start1 + (frame->height >> vsub1) *
294  frame->linesize[planes[j]];
295  if (i == j)
296  continue;
297 
298  if (FFSIGN(start - end1) != FFSIGN(start - end1 - req_start) ||
299  FFSIGN(end - start1) != FFSIGN(end - start1 + req_end))
300  return 1;
301  }
302  }
303 
304  return 0;
305 }
306 
308 {
309  int i;
310 
311  if (!av_frame_is_writable(frame))
312  return 1;
313 
314  for (i = 0; i < 4 && frame->buf[i]; i++)
315  if (buffer_needs_copy(s, frame, frame->buf[i]))
316  return 1;
317  return 0;
318 }
319 
320 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
321 {
322  PadContext *s = inlink->dst->priv;
323  AVFilterLink *outlink = inlink->dst->outputs[0];
324  AVFrame *out;
325  int needs_copy;
326  if(s->eval_mode == EVAL_MODE_FRAME && (
327  in->width != s->inlink_w
328  || in->height != s->inlink_h
329  || in->format != outlink->format
331  int ret;
332 
333  inlink->dst->inputs[0]->format = in->format;
334  inlink->dst->inputs[0]->w = in->width;
335  inlink->dst->inputs[0]->h = in->height;
336 
339 
340 
341  if ((ret = config_input(inlink)) < 0) {
342  s->inlink_w = -1;
343  return ret;
344  }
345  if ((ret = config_output(outlink)) < 0) {
346  s->inlink_w = -1;
347  return ret;
348  }
349  }
350 
351  needs_copy = frame_needs_copy(s, in);
352 
353  if (needs_copy) {
354  av_log(inlink->dst, AV_LOG_DEBUG, "Direct padding impossible allocating new frame\n");
355  out = ff_get_video_buffer(inlink->dst->outputs[0],
356  FFMAX(inlink->w, s->w),
357  FFMAX(inlink->h, s->h));
358  if (!out) {
359  av_frame_free(&in);
360  return AVERROR(ENOMEM);
361  }
362 
363  av_frame_copy_props(out, in);
364  } else {
365  int i;
366 
367  out = in;
368  for (i = 0; i < 4 && out->data[i] && out->linesize[i]; i++) {
369  int hsub = s->draw.hsub[i];
370  int vsub = s->draw.vsub[i];
371  out->data[i] -= (s->x >> hsub) * s->draw.pixelstep[i] +
372  (s->y >> vsub) * out->linesize[i];
373  }
374  }
375 
376  /* top bar */
377  if (s->y) {
378  ff_fill_rectangle(&s->draw, &s->color,
379  out->data, out->linesize,
380  0, 0, s->w, s->y);
381  }
382 
383  /* bottom bar */
384  if (s->h > s->y + s->in_h) {
385  ff_fill_rectangle(&s->draw, &s->color,
386  out->data, out->linesize,
387  0, s->y + s->in_h, s->w, s->h - s->y - s->in_h);
388  }
389 
390  /* left border */
391  ff_fill_rectangle(&s->draw, &s->color, out->data, out->linesize,
392  0, s->y, s->x, in->height);
393 
394  if (needs_copy) {
396  out->data, out->linesize, in->data, in->linesize,
397  s->x, s->y, 0, 0, in->width, in->height);
398  }
399 
400  /* right border */
401  ff_fill_rectangle(&s->draw, &s->color, out->data, out->linesize,
402  s->x + s->in_w, s->y, s->w - s->x - s->in_w,
403  in->height);
404 
405  out->width = s->w;
406  out->height = s->h;
407 
408  if (in != out)
409  av_frame_free(&in);
410  return ff_filter_frame(inlink->dst->outputs[0], out);
411 }
412 
413 #define OFFSET(x) offsetof(PadContext, x)
414 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
415 
416 static const AVOption pad_options[] = {
417  { "width", "set the pad area width expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, CHAR_MIN, CHAR_MAX, FLAGS },
418  { "w", "set the pad area width expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, CHAR_MIN, CHAR_MAX, FLAGS },
419  { "height", "set the pad area height expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, CHAR_MIN, CHAR_MAX, FLAGS },
420  { "h", "set the pad area height expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, CHAR_MIN, CHAR_MAX, FLAGS },
421  { "x", "set the x offset expression for the input image position", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },
422  { "y", "set the y offset expression for the input image position", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },
423  { "color", "set the color of the padded area border", OFFSET(rgba_color), AV_OPT_TYPE_COLOR, {.str = "black"}, .flags = FLAGS },
424  { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
425  { "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
426  { "frame", "eval expressions during initialization and per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
427  { "aspect", "pad to fit an aspect instead of a resolution", OFFSET(aspect), AV_OPT_TYPE_RATIONAL, {.dbl = 0}, 0, DBL_MAX, FLAGS },
428  { NULL }
429 };
430 
432 
434  {
435  .name = "default",
436  .type = AVMEDIA_TYPE_VIDEO,
437  .config_props = config_input,
438  .get_video_buffer = get_video_buffer,
439  .filter_frame = filter_frame,
440  },
441  { NULL }
442 };
443 
445  {
446  .name = "default",
447  .type = AVMEDIA_TYPE_VIDEO,
448  .config_props = config_output,
449  },
450  { NULL }
451 };
452 
454  .name = "pad",
455  .description = NULL_IF_CONFIG_SMALL("Pad the input video."),
456  .priv_size = sizeof(PadContext),
457  .priv_class = &pad_class,
459  .inputs = avfilter_vf_pad_inputs,
460  .outputs = avfilter_vf_pad_outputs,
461 };
int plane
Definition: avisynth_c.h:422
AVFilterFormats * ff_draw_supported_pixel_formats(unsigned flags)
Return the list of pixel formats supported by the draw functions.
Definition: drawutils.c:721
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:768
AVRational aspect
Definition: vf_pad.c:92
static AVFrame * get_video_buffer(AVFilterLink *inlink, int w, int h)
Definition: vf_pad.c:225
#define FLAGS
Definition: vf_pad.c:414
AVRational av_div_q(AVRational b, AVRational c)
Divide one rational by another.
Definition: rational.c:88
This structure describes decoded (raw) audio or video data.
Definition: frame.h:193
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:286
AVOption.
Definition: opt.h:246
misc image utilities
uint8_t hsub[MAX_PLANES]
Definition: drawutils.h:54
Main libavfilter public API header.
FFDrawColor color
Definition: vf_pad.c:100
AVBufferRef * buf[AV_NUM_DATA_POINTERS]
AVBuffer references backing the data for this frame.
Definition: frame.h:376
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
int x
Definition: vf_pad.c:89
int num
Numerator.
Definition: rational.h:59
Various defines for YUV<->RGB conversion.
char * x_expr
width expression string
Definition: vf_pad.c:96
static const AVFilterPad avfilter_vf_pad_outputs[]
Definition: vf_pad.c:444
static int config_output(AVFilterLink *outlink)
Definition: vf_pad.c:216
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
Definition: video.c:92
Definition: vf_pad.c:65
int w
Definition: vf_pad.c:88
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:709
const char * name
Pad name.
Definition: internal.h:60
AVFilterLink ** inputs
array of pointers to input links
Definition: avfilter.h:331
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1125
AVFILTER_DEFINE_CLASS(pad)
uint8_t
Definition: vf_pad.c:68
AVOptions.
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
Definition: vf_pad.c:67
static const char *const var_names[]
Definition: vf_pad.c:45
Definition: vf_pad.c:62
static AVFrame * frame
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
#define av_log(a,...)
A filter pad used for either input or output.
Definition: internal.h:54
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:726
int width
width and height of the video frame
Definition: frame.h:245
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
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:568
Definition: vf_pad.c:69
#define AVERROR(e)
Definition: error.h:43
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:163
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:179
void * priv
private data for use by the filter
Definition: avfilter.h:338
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
static int config_input(AVFilterLink *inlink)
Definition: vf_pad.c:105
void ff_draw_color(FFDrawContext *draw, FFDrawColor *color, const uint8_t rgba[4])
Prepare a color.
Definition: drawutils.c:224
uint8_t vsub_max
Definition: drawutils.h:57
static const AVOption pad_options[]
Definition: vf_pad.c:416
#define FFMAX(a, b)
Definition: common.h:94
var_name
Definition: aeval.c:46
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:129
static int frame_needs_copy(PadContext *s, AVFrame *frame)
Definition: vf_pad.c:307
#define FFSIGN(a)
Definition: common.h:73
static int buffer_needs_copy(PadContext *s, AVFrame *frame, AVBufferRef *buf)
Definition: vf_pad.c:255
AVFormatContext * ctx
Definition: movenc.c:48
AVBufferRef * av_frame_get_plane_buffer(AVFrame *frame, int plane)
Get the buffer reference a given data plane is stored in.
Definition: frame.c:601
Definition: vf_pad.c:61
char * w_expr
width expression string
Definition: vf_pad.c:94
int y
offsets of the input area with respect to the padded area
Definition: vf_pad.c:89
int in_w
Definition: vf_pad.c:90
int inlink_w
Definition: vf_pad.c:91
Definition: vf_pad.c:63
static const AVFilterPad outputs[]
Definition: af_afftfilt.c:386
#define OFFSET(x)
Definition: vf_pad.c:413
EvalMode
Definition: af_volume.h:39
#define FF_ARRAY_ELEMS(a)
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Definition: frame.h:257
uint8_t rgba_color[4]
color for the padding area
Definition: vf_pad.c:98
static const AVFilterPad inputs[]
Definition: af_afftfilt.c:376
misc drawing utilities
Definition: vf_pad.c:72
int av_frame_is_writable(AVFrame *frame)
Check if the frame data is writable.
Definition: frame.c:536
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:224
static const AVFilterPad avfilter_vf_pad_inputs[]
Definition: vf_pad.c:433
int eval_mode
expression evaluation mode
Definition: vf_pad.c:102
uint8_t * data
The data buffer.
Definition: buffer.h:89
AVRational sample_aspect_ratio
Sample aspect ratio for the video frame, 0/1 if unknown/unspecified.
Definition: frame.h:272
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> in
void * buf
Definition: avisynth_c.h:690
uint8_t hsub_max
Definition: drawutils.h:56
Describe the class of an AVClass context structure.
Definition: log.h:67
Filter definition.
Definition: avfilter.h:144
Rational number (pair of numerator and denominator).
Definition: rational.h:58
Definition: vf_pad.c:66
const char * name
Filter name.
Definition: avfilter.h:148
int ff_draw_init(FFDrawContext *draw, enum AVPixelFormat format, unsigned flags)
Init a draw context.
Definition: drawutils.c:176
Definition: vf_pad.c:64
misc parsing utilities
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:335
int size
Size of data in bytes.
Definition: buffer.h:93
static int query_formats(AVFilterContext *ctx)
Definition: vf_pad.c:75
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:207
A reference to a data buffer.
Definition: buffer.h:81
common internal and external API header
if(ret< 0)
Definition: vf_mcdeint.c:282
int inlink_h
Definition: vf_pad.c:91
int den
Denominator.
Definition: rational.h:60
FFDrawContext draw
Definition: vf_pad.c:99
char * y_expr
height expression string
Definition: vf_pad.c:97
#define NAN
Definition: math.h:28
int pixelstep[MAX_PLANES]
Definition: drawutils.h:52
AVFilter ff_vf_pad
Definition: vf_pad.c:453
int h
output dimensions, a value of 0 will result in the input size
Definition: vf_pad.c:88
char * h_expr
height expression string
Definition: vf_pad.c:95
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:308
An instance of a filter.
Definition: avfilter.h:323
int height
Definition: frame.h:245
FILE * out
Definition: movenc.c:54
uint8_t vsub[MAX_PLANES]
Definition: drawutils.h:55
void INT64 start
Definition: avisynth_c.h:690
internal API functions
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: vf_pad.c:320
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
Definition: frame.c:596
simple arithmetic expression evaluator