FFmpeg
vf_zoompan.c
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1 /*
2  * Copyright (c) 2013 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/eval.h"
22 #include "libavutil/opt.h"
23 #include "libavutil/pixdesc.h"
24 #include "avfilter.h"
25 #include "filters.h"
26 #include "formats.h"
27 #include "internal.h"
28 #include "video.h"
29 #include "libswscale/swscale.h"
30 
31 static const char *const var_names[] = {
32  "in_w", "iw",
33  "in_h", "ih",
34  "out_w", "ow",
35  "out_h", "oh",
36  "in",
37  "on",
38  "duration",
39  "pduration",
40  "in_time", "it",
41  "out_time", "time", "ot",
42  "frame",
43  "zoom",
44  "pzoom",
45  "x", "px",
46  "y", "py",
47  "a",
48  "sar",
49  "dar",
50  "hsub",
51  "vsub",
52  NULL
53 };
54 
55 enum var_name {
56  VAR_IN_W, VAR_IW,
57  VAR_IN_H, VAR_IH,
58  VAR_OUT_W, VAR_OW,
59  VAR_OUT_H, VAR_OH,
60  VAR_IN,
61  VAR_ON,
62  VAR_DURATION,
63  VAR_PDURATION,
64  VAR_IN_TIME, VAR_IT,
65  VAR_TIME, VAR_OUT_TIME, VAR_OT,
66  VAR_FRAME,
67  VAR_ZOOM,
68  VAR_PZOOM,
69  VAR_X, VAR_PX,
70  VAR_Y, VAR_PY,
71  VAR_A,
72  VAR_SAR,
73  VAR_DAR,
74  VAR_HSUB,
75  VAR_VSUB,
76  VARS_NB
77 };
78 
79 typedef struct ZPcontext {
80  const AVClass *class;
81  char *zoom_expr_str;
82  char *x_expr_str;
83  char *y_expr_str;
84  char *duration_expr_str;
85 
86  AVExpr *zoom_expr, *x_expr, *y_expr;
87 
88  int w, h;
89  double x, y;
90  double prev_zoom;
91  int prev_nb_frames;
92  struct SwsContext *sws;
93  int64_t frame_count;
94  const AVPixFmtDescriptor *desc;
95  AVFrame *in;
96  double var_values[VARS_NB];
97  int nb_frames;
98  int current_frame;
99  int finished;
100  AVRational framerate;
101 } ZPContext;
102 
103 #define OFFSET(x) offsetof(ZPContext, x)
104 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
105 static const AVOption zoompan_options[] = {
106  { "zoom", "set the zoom expression", OFFSET(zoom_expr_str), AV_OPT_TYPE_STRING, {.str = "1" }, .flags = FLAGS },
107  { "z", "set the zoom expression", OFFSET(zoom_expr_str), AV_OPT_TYPE_STRING, {.str = "1" }, .flags = FLAGS },
108  { "x", "set the x expression", OFFSET(x_expr_str), AV_OPT_TYPE_STRING, {.str="0"}, .flags = FLAGS },
109  { "y", "set the y expression", OFFSET(y_expr_str), AV_OPT_TYPE_STRING, {.str="0"}, .flags = FLAGS },
110  { "d", "set the duration expression", OFFSET(duration_expr_str), AV_OPT_TYPE_STRING, {.str="90"}, .flags = FLAGS },
111  { "s", "set the output image size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="hd720"}, .flags = FLAGS },
112  { "fps", "set the output framerate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, { .str = "25" }, 0, INT_MAX, .flags = FLAGS },
113  { NULL }
114 };
115 
116 AVFILTER_DEFINE_CLASS(zoompan);
117 
118 static av_cold int init(AVFilterContext *ctx)
119 {
120  ZPContext *s = ctx->priv;
121 
122  s->prev_zoom = 1;
123  return 0;
124 }
125 
126 static int config_output(AVFilterLink *outlink)
127 {
128  AVFilterContext *ctx = outlink->src;
129  ZPContext *s = ctx->priv;
130  int ret;
131 
132  outlink->w = s->w;
133  outlink->h = s->h;
134  outlink->time_base = av_inv_q(s->framerate);
135  outlink->frame_rate = s->framerate;
136  s->desc = av_pix_fmt_desc_get(outlink->format);
137  s->finished = 1;
138 
139  ret = av_expr_parse(&s->zoom_expr, s->zoom_expr_str, var_names, NULL, NULL, NULL, NULL, 0, ctx);
140  if (ret < 0)
141  return ret;
142 
143  ret = av_expr_parse(&s->x_expr, s->x_expr_str, var_names, NULL, NULL, NULL, NULL, 0, ctx);
144  if (ret < 0)
145  return ret;
146 
147  ret = av_expr_parse(&s->y_expr, s->y_expr_str, var_names, NULL, NULL, NULL, NULL, 0, ctx);
148  if (ret < 0)
149  return ret;
150 
151  return 0;
152 }
153 
154 static int output_single_frame(AVFilterContext *ctx, AVFrame *in, double *var_values, int i,
155  double *zoom, double *dx, double *dy)
156 {
157  ZPContext *s = ctx->priv;
158  AVFilterLink *outlink = ctx->outputs[0];
159  AVFilterLink *inlink = ctx->inputs[0];
160  int64_t pts = s->frame_count;
161  int k, x, y, w, h, ret = 0;
162  uint8_t *input[4];
163  int px[4], py[4];
164  AVFrame *out;
165 
166  var_values[VAR_PX] = s->x;
167  var_values[VAR_PY] = s->y;
168  var_values[VAR_PZOOM] = s->prev_zoom;
169  var_values[VAR_PDURATION] = s->prev_nb_frames;
170  var_values[VAR_IN_TIME] = var_values[VAR_IT] = in->pts == AV_NOPTS_VALUE ?
171  NAN : in->pts * av_q2d(inlink->time_base);
172  var_values[VAR_OUT_TIME] = pts * av_q2d(outlink->time_base);
173  var_values[VAR_TIME] = var_values[VAR_OT] = var_values[VAR_OUT_TIME];
174  var_values[VAR_FRAME] = i;
175  var_values[VAR_ON] = outlink->frame_count_in;
176 
177  *zoom = av_expr_eval(s->zoom_expr, var_values, NULL);
178 
179  *zoom = av_clipd(*zoom, 1, 10);
180  var_values[VAR_ZOOM] = *zoom;
181  w = in->width * (1.0 / *zoom);
182  h = in->height * (1.0 / *zoom);
183 
184  *dx = av_expr_eval(s->x_expr, var_values, NULL);
185 
186  x = *dx = av_clipd(*dx, 0, FFMAX(in->width - w, 0));
187  var_values[VAR_X] = *dx;
188  x &= ~((1 << s->desc->log2_chroma_w) - 1);
189 
190  *dy = av_expr_eval(s->y_expr, var_values, NULL);
191 
192  y = *dy = av_clipd(*dy, 0, FFMAX(in->height - h, 0));
193  var_values[VAR_Y] = *dy;
194  y &= ~((1 << s->desc->log2_chroma_h) - 1);
195 
196  out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
197  if (!out) {
198  ret = AVERROR(ENOMEM);
199  return ret;
200  }
201 
202  px[1] = px[2] = AV_CEIL_RSHIFT(x, s->desc->log2_chroma_w);
203  px[0] = px[3] = x;
204 
205  py[1] = py[2] = AV_CEIL_RSHIFT(y, s->desc->log2_chroma_h);
206  py[0] = py[3] = y;
207 
208  s->sws = sws_alloc_context();
209  if (!s->sws) {
210  ret = AVERROR(ENOMEM);
211  goto error;
212  }
213 
214  for (k = 0; in->data[k]; k++)
215  input[k] = in->data[k] + py[k] * in->linesize[k] + px[k];
216 
217  av_opt_set_int(s->sws, "srcw", w, 0);
218  av_opt_set_int(s->sws, "srch", h, 0);
219  av_opt_set_int(s->sws, "src_format", in->format, 0);
220  av_opt_set_int(s->sws, "dstw", outlink->w, 0);
221  av_opt_set_int(s->sws, "dsth", outlink->h, 0);
222  av_opt_set_int(s->sws, "dst_format", outlink->format, 0);
223  av_opt_set_int(s->sws, "sws_flags", SWS_BICUBIC, 0);
224 
225  if ((ret = sws_init_context(s->sws, NULL, NULL)) < 0)
226  goto error;
227 
228  sws_scale(s->sws, (const uint8_t *const *)&input, in->linesize, 0, h, out->data, out->linesize);
229 
230  out->pts = pts;
231  s->frame_count++;
232 
233  ret = ff_filter_frame(outlink, out);
234  sws_freeContext(s->sws);
235  s->sws = NULL;
236  s->current_frame++;
237 
238  if (s->current_frame >= s->nb_frames) {
239  if (*dx != -1)
240  s->x = *dx;
241  if (*dy != -1)
242  s->y = *dy;
243  if (*zoom != -1)
244  s->prev_zoom = *zoom;
245  s->prev_nb_frames = s->nb_frames;
246  s->nb_frames = 0;
247  s->current_frame = 0;
248  av_frame_free(&s->in);
249  s->finished = 1;
250  }
251  return ret;
252 error:
253  sws_freeContext(s->sws);
254  s->sws = NULL;
255  av_frame_free(&out);
256  return ret;
257 }
258 
259 static int activate(AVFilterContext *ctx)
260 {
261  ZPContext *s = ctx->priv;
262  AVFilterLink *inlink = ctx->inputs[0];
263  AVFilterLink *outlink = ctx->outputs[0];
264  int status, ret = 0;
265  int64_t pts;
266 
267  FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
268 
269  if (s->in && ff_outlink_frame_wanted(outlink)) {
270  double zoom = -1, dx = -1, dy = -1;
271 
272  ret = output_single_frame(ctx, s->in, s->var_values, s->current_frame,
273  &zoom, &dx, &dy);
274  if (ret < 0)
275  return ret;
276  }
277 
278  if (!s->in && (ret = ff_inlink_consume_frame(inlink, &s->in)) > 0) {
279  double zoom = -1, dx = -1, dy = -1, nb_frames;
280 
281  s->finished = 0;
282  s->var_values[VAR_IN_W] = s->var_values[VAR_IW] = s->in->width;
283  s->var_values[VAR_IN_H] = s->var_values[VAR_IH] = s->in->height;
284  s->var_values[VAR_OUT_W] = s->var_values[VAR_OW] = s->w;
285  s->var_values[VAR_OUT_H] = s->var_values[VAR_OH] = s->h;
286  s->var_values[VAR_IN] = inlink->frame_count_out - 1;
287  s->var_values[VAR_ON] = outlink->frame_count_in;
288  s->var_values[VAR_PX] = s->x;
289  s->var_values[VAR_PY] = s->y;
290  s->var_values[VAR_X] = 0;
291  s->var_values[VAR_Y] = 0;
292  s->var_values[VAR_PZOOM] = s->prev_zoom;
293  s->var_values[VAR_ZOOM] = 1;
294  s->var_values[VAR_PDURATION] = s->prev_nb_frames;
295  s->var_values[VAR_A] = (double) s->in->width / s->in->height;
296  s->var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?
297  (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
298  s->var_values[VAR_DAR] = s->var_values[VAR_A] * s->var_values[VAR_SAR];
299  s->var_values[VAR_HSUB] = 1 << s->desc->log2_chroma_w;
300  s->var_values[VAR_VSUB] = 1 << s->desc->log2_chroma_h;
301 
302  if ((ret = av_expr_parse_and_eval(&nb_frames, s->duration_expr_str,
303  var_names, s->var_values,
304  NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
305  av_frame_free(&s->in);
306  return ret;
307  }
308 
309  s->var_values[VAR_DURATION] = s->nb_frames = nb_frames;
310 
311  ret = output_single_frame(ctx, s->in, s->var_values, s->current_frame,
312  &zoom, &dx, &dy);
313  if (ret < 0)
314  return ret;
315  }
316  if (ret < 0) {
317  return ret;
318  } else if (s->finished && ff_inlink_acknowledge_status(inlink, &status, &pts)) {
319  ff_outlink_set_status(outlink, status, pts);
320  return 0;
321  } else {
322  if (ff_outlink_frame_wanted(outlink) && s->finished)
323  ff_inlink_request_frame(inlink);
324  return 0;
325  }
326 }
327 
328 static const enum AVPixelFormat pix_fmts[] = {
329  AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
330  AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
331  AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
332  AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P,
333  AV_PIX_FMT_YUVA420P,
334  AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
335  AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
336  AV_PIX_FMT_YUVJ411P,
337  AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
338  AV_PIX_FMT_GRAY8,
339  AV_PIX_FMT_NONE
340 };
341 
342 static av_cold void uninit(AVFilterContext *ctx)
343 {
344  ZPContext *s = ctx->priv;
345 
346  sws_freeContext(s->sws);
347  s->sws = NULL;
348  av_expr_free(s->x_expr);
349  av_expr_free(s->y_expr);
350  av_expr_free(s->zoom_expr);
351  av_frame_free(&s->in);
352 }
353 
354 static const AVFilterPad inputs[] = {
355  {
356  .name = "default",
357  .type = AVMEDIA_TYPE_VIDEO,
358  },
359 };
360 
361 static const AVFilterPad outputs[] = {
362  {
363  .name = "default",
364  .type = AVMEDIA_TYPE_VIDEO,
365  .config_props = config_output,
366  },
367 };
368 
369 const AVFilter ff_vf_zoompan = {
370  .name = "zoompan",
371  .description = NULL_IF_CONFIG_SMALL("Apply Zoom & Pan effect."),
372  .priv_size = sizeof(ZPContext),
373  .priv_class = &zoompan_class,
374  .init = init,
375  .uninit = uninit,
376  .activate = activate,
377  FILTER_INPUTS(inputs),
378  FILTER_OUTPUTS(outputs),
379  FILTER_PIXFMTS_ARRAY(pix_fmts),
380 };
error
static void error(const char *err)
Definition: target_bsf_fuzzer.c:31
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:101
inputs
static const AVFilterPad inputs[]
Definition: vf_zoompan.c:354
ZPcontext::current_frame
int current_frame
Definition: vf_zoompan.c:98
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
status
they must not be accessed directly The fifo field contains the frames that are queued in the input for processing by the filter The status_in and status_out fields contains the queued status(EOF or error) of the link
ZPcontext::y_expr
AVExpr * y_expr
Definition: vf_zoompan.c:86
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
VAR_ZOOM
@ VAR_ZOOM
Definition: vf_zoompan.c:67
VAR_OUT_TIME
@ VAR_OUT_TIME
Definition: vf_zoompan.c:65
VAR_ON
@ VAR_ON
Definition: vf_zoompan.c:61
out
FILE * out
Definition: movenc.c:54
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:999
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2662
VAR_IN
@ VAR_IN
Definition: vf_zoompan.c:60
AV_OPT_TYPE_VIDEO_RATE
@ AV_OPT_TYPE_VIDEO_RATE
offset must point to AVRational
Definition: opt.h:238
FILTER_PIXFMTS_ARRAY
#define FILTER_PIXFMTS_ARRAY(array)
Definition: internal.h:170
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
zoom
static void zoom(float *u, float *v, float amount)
Definition: vf_xfade.c:1629
VAR_PZOOM
@ VAR_PZOOM
Definition: vf_zoompan.c:68
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:111
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:325
pixdesc.h
VAR_IH
@ VAR_IH
Definition: vf_zoompan.c:57
AVFrame::pts
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:432
AVFrame::width
int width
Definition: frame.h:397
w
uint8_t w
Definition: llviddspenc.c:38
AVOption
AVOption.
Definition: opt.h:251
VAR_TIME
@ VAR_TIME
Definition: vf_zoompan.c:65
VAR_IW
@ VAR_IW
Definition: vf_zoompan.c:56
AV_PIX_FMT_YUV440P
@ AV_PIX_FMT_YUV440P
planar YUV 4:4:0 (1 Cr & Cb sample per 1x2 Y samples)
Definition: pixfmt.h:99
sws_scale
int attribute_align_arg sws_scale(struct SwsContext *c, const uint8_t *const srcSlice[], const int srcStride[], int srcSliceY, int srcSliceH, uint8_t *const dst[], const int dstStride[])
swscale wrapper, so we don't need to export the SwsContext.
Definition: swscale.c:1201
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
ZPcontext
Definition: vf_zoompan.c:79
ZPcontext::desc
const AVPixFmtDescriptor * desc
Definition: vf_zoompan.c:94
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:175
outputs
static const AVFilterPad outputs[]
Definition: vf_zoompan.c:361
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(zoompan)
VAR_VSUB
@ VAR_VSUB
Definition: vf_zoompan.c:75
video.h
FF_FILTER_FORWARD_STATUS_BACK
#define FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink)
Forward the status on an output link to an input link.
Definition: filters.h:199
VAR_OH
@ VAR_OH
Definition: vf_zoompan.c:59
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:346
formats.h
av_expr_parse
int av_expr_parse(AVExpr **expr, const char *s, const char *const *const_names, const char *const *func1_names, double(*const *funcs1)(void *, double), const char *const *func2_names, double(*const *funcs2)(void *, double, double), int log_offset, void *log_ctx)
Parse an expression.
Definition: eval.c:685
VAR_PY
@ VAR_PY
Definition: vf_zoompan.c:70
VARS_NB
@ VARS_NB
Definition: vf_zoompan.c:76
framerate
int framerate
Definition: h264_levels.c:65
ff_inlink_consume_frame
int ff_inlink_consume_frame(AVFilterLink *link, AVFrame **rframe)
Take a frame from the link's FIFO and update the link's stats.
Definition: avfilter.c:1394
VAR_A
@ VAR_A
Definition: vf_zoompan.c:71
AV_PIX_FMT_GBRAP
@ AV_PIX_FMT_GBRAP
planar GBRA 4:4:4:4 32bpp
Definition: pixfmt.h:205
init
static av_cold int init(AVFilterContext *ctx)
Definition: vf_zoompan.c:118
VAR_IN_H
@ VAR_IN_H
Definition: vf_zoompan.c:57
pts
static int64_t pts
Definition: transcode_aac.c:654
av_expr_free
void av_expr_free(AVExpr *e)
Free a parsed expression previously created with av_expr_parse().
Definition: eval.c:336
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:49
AV_PIX_FMT_YUVJ411P
@ AV_PIX_FMT_YUVJ411P
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples) full scale (JPEG), deprecated in favor ...
Definition: pixfmt.h:248
VAR_DURATION
@ VAR_DURATION
Definition: vf_zoompan.c:62
ZPcontext::nb_frames
int nb_frames
Definition: vf_zoompan.c:97
av_cold
#define av_cold
Definition: attributes.h:90
ZPcontext::x_expr_str
char * x_expr_str
Definition: vf_zoompan.c:82
VAR_PX
@ VAR_PX
Definition: vf_zoompan.c:69
AV_PIX_FMT_YUVJ422P
@ AV_PIX_FMT_YUVJ422P
planar YUV 4:2:2, 16bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV422P and setting col...
Definition: pixfmt.h:79
ZPcontext::y
double y
Definition: vf_zoompan.c:89
ff_outlink_set_status
static void ff_outlink_set_status(AVFilterLink *link, int status, int64_t pts)
Set the status field of a link from the source filter.
Definition: filters.h:189
ff_inlink_request_frame
void ff_inlink_request_frame(AVFilterLink *link)
Mark that a frame is wanted on the link.
Definition: avfilter.c:1511
s
#define s(width, name)
Definition: cbs_vp9.c:256
AV_PIX_FMT_YUVA420P
@ AV_PIX_FMT_YUVA420P
planar YUV 4:2:0, 20bpp, (1 Cr & Cb sample per 2x2 Y & A samples)
Definition: pixfmt.h:101
activate
static int activate(AVFilterContext *ctx)
Definition: vf_zoompan.c:259
AV_CEIL_RSHIFT
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:50
ZPcontext::finished
int finished
Definition: vf_zoompan.c:99
av_q2d
static double av_q2d(AVRational a)
Convert an AVRational to a double.
Definition: rational.h:104
VAR_SAR
@ VAR_SAR
Definition: vf_zoompan.c:72
ZPcontext::var_values
double var_values[VARS_NB]
Definition: vf_zoompan.c:96
filters.h
var_name
var_name
Definition: noise_bsf.c:46
ctx
AVFormatContext * ctx
Definition: movenc.c:48
av_expr_eval
double av_expr_eval(AVExpr *e, const double *const_values, void *opaque)
Evaluate a previously parsed expression.
Definition: eval.c:766
AVExpr
Definition: eval.c:157
AV_PIX_FMT_YUV420P
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
NAN
#define NAN
Definition: mathematics.h:64
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:190
VAR_IN_W
@ VAR_IN_W
Definition: vf_zoompan.c:56
AV_PIX_FMT_YUVJ444P
@ AV_PIX_FMT_YUVJ444P
planar YUV 4:4:4, 24bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV444P and setting col...
Definition: pixfmt.h:80
VAR_Y
@ VAR_Y
Definition: vf_zoompan.c:70
ZPcontext::frame_count
int64_t frame_count
Definition: vf_zoompan.c:93
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
ZPcontext::framerate
AVRational framerate
Definition: vf_zoompan.c:100
NULL
#define NULL
Definition: coverity.c:32
output_single_frame
static int output_single_frame(AVFilterContext *ctx, AVFrame *in, double *var_values, int i, double *zoom, double *dx, double *dy)
Definition: vf_zoompan.c:154
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
AV_PIX_FMT_YUVJ420P
@ AV_PIX_FMT_YUVJ420P
planar YUV 4:2:0, 12bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV420P and setting col...
Definition: pixfmt.h:78
AV_OPT_TYPE_IMAGE_SIZE
@ AV_OPT_TYPE_IMAGE_SIZE
offset must point to two consecutive integers
Definition: opt.h:235
VAR_OUT_H
@ VAR_OUT_H
Definition: vf_zoompan.c:59
sws_alloc_context
struct SwsContext * sws_alloc_context(void)
Allocate an empty SwsContext.
Definition: utils.c:1150
pix_fmts
static enum AVPixelFormat pix_fmts[]
Definition: vf_zoompan.c:328
zoompan_options
static const AVOption zoompan_options[]
Definition: vf_zoompan.c:105
ZPcontext::x_expr
AVExpr * x_expr
Definition: vf_zoompan.c:86
ZPcontext::prev_zoom
double prev_zoom
Definition: vf_zoompan.c:90
ZPcontext::in
AVFrame * in
Definition: vf_zoompan.c:95
double
double
Definition: af_crystalizer.c:132
AV_PIX_FMT_GRAY8
@ AV_PIX_FMT_GRAY8
Y , 8bpp.
Definition: pixfmt.h:74
ff_inlink_acknowledge_status
int ff_inlink_acknowledge_status(AVFilterLink *link, int *rstatus, int64_t *rpts)
Test and acknowledge the change of status on the link.
Definition: avfilter.c:1348
FLAGS
#define FLAGS
Definition: vf_zoompan.c:104
av_opt_set_int
int av_opt_set_int(void *obj, const char *name, int64_t val, int search_flags)
Definition: opt.c:624
VAR_FRAME
@ VAR_FRAME
Definition: vf_zoompan.c:66
eval.h
var_names
static const char *const var_names[]
Definition: vf_zoompan.c:31
ZPcontext::zoom_expr
AVExpr * zoom_expr
Definition: vf_zoompan.c:86
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
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
VAR_OW
@ VAR_OW
Definition: vf_zoompan.c:58
AVFrame::format
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames,...
Definition: frame.h:412
AV_PIX_FMT_YUVA444P
@ AV_PIX_FMT_YUVA444P
planar YUV 4:4:4 32bpp, (1 Cr & Cb sample per 1x1 Y & A samples)
Definition: pixfmt.h:167
VAR_X
@ VAR_X
Definition: vf_zoompan.c:69
input
and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some input
Definition: filter_design.txt:172
VAR_OUT_W
@ VAR_OUT_W
Definition: vf_zoompan.c:58
internal.h
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
AV_PIX_FMT_YUVJ440P
@ AV_PIX_FMT_YUVJ440P
planar YUV 4:4:0 full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV440P and setting color_range
Definition: pixfmt.h:100
av_inv_q
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
ZPcontext::sws
struct SwsContext * sws
Definition: vf_zoompan.c:92
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:55
ff_vf_zoompan
const AVFilter ff_vf_zoompan
Definition: vf_zoompan.c:369
AVFilter
Filter definition.
Definition: avfilter.h:171
VAR_HSUB
@ VAR_HSUB
Definition: vf_zoompan.c:74
ret
ret
Definition: filter_design.txt:187
ZPcontext::duration_expr_str
char * duration_expr_str
Definition: vf_zoompan.c:84
sws_init_context
av_warn_unused_result int sws_init_context(struct SwsContext *sws_context, SwsFilter *srcFilter, SwsFilter *dstFilter)
Initialize the swscaler context sws_context.
Definition: utils.c:1292
AVFrame::height
int height
Definition: frame.h:397
sws_freeContext
void sws_freeContext(struct SwsContext *swsContext)
Free the swscaler context swsContext.
Definition: utils.c:2381
VAR_IN_TIME
@ VAR_IN_TIME
Definition: vf_zoompan.c:64
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
avfilter.h
config_output
static int config_output(AVFilterLink *outlink)
Definition: vf_zoompan.c:126
AV_PIX_FMT_YUV444P
@ AV_PIX_FMT_YUV444P
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:71
AVFilterContext
An instance of a filter.
Definition: avfilter.h:408
OFFSET
#define OFFSET(x)
Definition: vf_zoompan.c:103
AV_PIX_FMT_GBRP
@ AV_PIX_FMT_GBRP
planar GBR 4:4:4 24bpp
Definition: pixfmt.h:158
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AV_PIX_FMT_YUV422P
@ AV_PIX_FMT_YUV422P
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:70
VAR_IT
@ VAR_IT
Definition: vf_zoompan.c:64
ZPcontext::prev_nb_frames
int prev_nb_frames
Definition: vf_zoompan.c:91
AVPixFmtDescriptor
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:69
ZPcontext::h
int h
Definition: vf_zoompan.c:88
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:191
AV_PIX_FMT_YUV411P
@ AV_PIX_FMT_YUV411P
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
Definition: pixfmt.h:73
ZPcontext::y_expr_str
char * y_expr_str
Definition: vf_zoompan.c:83
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:370
AV_PIX_FMT_YUV410P
@ AV_PIX_FMT_YUV410P
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
Definition: pixfmt.h:72
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_zoompan.c:342
VAR_PDURATION
@ VAR_PDURATION
Definition: vf_zoompan.c:63
h
h
Definition: vp9dsp_template.c:2038
ff_outlink_frame_wanted
the definition of that something depends on the semantic of the filter The callback must examine the status of the filter s links and proceed accordingly The status of output links is stored in the status_in and status_out fields and tested by the ff_outlink_frame_wanted() function. If this function returns true
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Definition: opt.h:229
ZPcontext::zoom_expr_str
char * zoom_expr_str
Definition: vf_zoompan.c:81
VAR_OT
@ VAR_OT
Definition: vf_zoompan.c:65
SwsContext
Definition: swscale_internal.h:298
ZPcontext::x
double x
Definition: vf_zoompan.c:89
SWS_BICUBIC
#define SWS_BICUBIC
Definition: swscale.h:67
swscale.h
AV_PIX_FMT_YUVA422P
@ AV_PIX_FMT_YUVA422P
planar YUV 4:2:2 24bpp, (1 Cr & Cb sample per 2x1 Y & A samples)
Definition: pixfmt.h:166
av_clipd
av_clipd
Definition: af_crystalizer.c:132
ZPcontext::w
int w
Definition: vf_zoompan.c:88
VAR_DAR
@ VAR_DAR
Definition: vf_zoompan.c:73
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