FFmpeg  4.3.7
vf_pad_opencl.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
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8  *
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11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include "libavutil/colorspace.h"
20 #include "libavutil/eval.h"
21 #include "libavutil/opt.h"
22 #include "libavutil/imgutils.h"
23 #include "avfilter.h"
24 #include "drawutils.h"
25 #include "formats.h"
26 #include "internal.h"
27 #include "opencl.h"
28 #include "opencl_source.h"
29 #include "video.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  "x",
37  "y",
38  "a",
39  "sar",
40  "dar",
41  NULL
42 };
43 
44 enum var_name {
55 };
56 
57 typedef struct PadOpenCLContext {
60  int is_rgb;
61  int is_packed;
62  int hsub, vsub;
63 
64  char *w_expr;
65  char *h_expr;
66  char *x_expr;
67  char *y_expr;
69 
70  cl_command_queue command_queue;
71  cl_kernel kernel_pad;
72 
73  int w, h;
74  int x, y;
77  cl_float4 pad_color_float;
78  cl_int2 pad_pos;
80 
81 static int pad_opencl_init(AVFilterContext *avctx, AVFrame *input_frame)
82 {
83  PadOpenCLContext *ctx = avctx->priv;
84  AVHWFramesContext *input_frames_ctx = (AVHWFramesContext *)input_frame->hw_frames_ctx->data;
85  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(input_frames_ctx->sw_format);
86  uint8_t rgba_map[4];
87  cl_int cle;
88  int err;
89 
90  ff_fill_rgba_map(rgba_map, input_frames_ctx->sw_format);
91  ctx->is_rgb = !!(desc->flags & AV_PIX_FMT_FLAG_RGB);
92  ctx->is_packed = !(desc->flags & AV_PIX_FMT_FLAG_PLANAR);
93  ctx->hsub = desc->log2_chroma_w;
94  ctx->vsub = desc->log2_chroma_h;
95 
97  if (err < 0)
98  goto fail;
99 
100  ctx->command_queue = clCreateCommandQueue(
101  ctx->ocf.hwctx->context,
102  ctx->ocf.hwctx->device_id,
103  0,
104  &cle
105  );
106 
107  if (ctx->is_rgb) {
108  ctx->pad_color[rgba_map[0]] = ctx->pad_rgba[0];
109  ctx->pad_color[rgba_map[1]] = ctx->pad_rgba[1];
110  ctx->pad_color[rgba_map[2]] = ctx->pad_rgba[2];
111  ctx->pad_color[rgba_map[3]] = ctx->pad_rgba[3];
112  } else {
113  ctx->pad_color[0] = RGB_TO_Y_BT709(ctx->pad_rgba[0], ctx->pad_rgba[1], ctx->pad_rgba[2]);
114  ctx->pad_color[1] = RGB_TO_U_BT709(ctx->pad_rgba[0], ctx->pad_rgba[1], ctx->pad_rgba[2], 0);
115  ctx->pad_color[2] = RGB_TO_V_BT709(ctx->pad_rgba[0], ctx->pad_rgba[1], ctx->pad_rgba[2], 0);
116  ctx->pad_color[3] = ctx->pad_rgba[3];
117  }
118 
119  CL_FAIL_ON_ERROR(AVERROR(EIO), "Failed to create OpenCL command queue %d.\n", cle);
120 
121  ctx->kernel_pad = clCreateKernel(ctx->ocf.program, "pad", &cle);
122  CL_FAIL_ON_ERROR(AVERROR(EIO), "Failed to create pad kernel: %d.\n", cle);
123 
124  for (int i = 0; i < 4; ++i) {
125  ctx->pad_color_float.s[i] = (float)ctx->pad_color[i] / 255.0;
126  }
127 
128  ctx->pad_pos.s[0] = ctx->x;
129  ctx->pad_pos.s[1] = ctx->y;
130 
131  ctx->initialized = 1;
132  return 0;
133 
134 fail:
135  if (ctx->command_queue)
136  clReleaseCommandQueue(ctx->command_queue);
137  if (ctx->kernel_pad)
138  clReleaseKernel(ctx->kernel_pad);
139  return err;
140 }
141 
142 static int filter_frame(AVFilterLink *link, AVFrame *input_frame)
143 {
144  AVFilterContext *avctx = link->dst;
145  AVFilterLink *outlink = avctx->outputs[0];
146  PadOpenCLContext *pad_ctx = avctx->priv;
148  int err;
149  cl_int cle;
150  size_t global_work[2];
151  cl_mem src, dst;
152 
153  if (!input_frame->hw_frames_ctx)
154  return AVERROR(EINVAL);
155 
156  if (!pad_ctx->initialized) {
157  err = pad_opencl_init(avctx, input_frame);
158  if (err < 0)
159  goto fail;
160  }
161 
162  output_frame = ff_get_video_buffer(outlink, outlink->w, outlink->h);
163  if (!output_frame) {
164  err = AVERROR(ENOMEM);
165  goto fail;
166  }
167 
168  for (int p = 0; p < FF_ARRAY_ELEMS(output_frame->data); p++) {
169  cl_float4 pad_color_float;
170  cl_int2 pad_pos;
171 
172  if (pad_ctx->is_packed) {
173  pad_color_float = pad_ctx->pad_color_float;
174  } else {
175  pad_color_float.s[0] = pad_ctx->pad_color_float.s[p];
176  pad_color_float.s[1] = pad_ctx->pad_color_float.s[2];
177  }
178 
179  if (p > 0 && p < 3) {
180  pad_pos.s[0] = pad_ctx->pad_pos.s[0] >> pad_ctx->hsub;
181  pad_pos.s[1] = pad_ctx->pad_pos.s[1] >> pad_ctx->vsub;
182  } else {
183  pad_pos.s[0] = pad_ctx->pad_pos.s[0];
184  pad_pos.s[1] = pad_ctx->pad_pos.s[1];
185  }
186 
187  src = (cl_mem)input_frame->data[p];
188  dst = (cl_mem)output_frame->data[p];
189 
190  if (!dst)
191  break;
192 
193  CL_SET_KERNEL_ARG(pad_ctx->kernel_pad, 0, cl_mem, &src);
194  CL_SET_KERNEL_ARG(pad_ctx->kernel_pad, 1, cl_mem, &dst);
195  CL_SET_KERNEL_ARG(pad_ctx->kernel_pad, 2, cl_float4, &pad_color_float);
196  CL_SET_KERNEL_ARG(pad_ctx->kernel_pad, 3, cl_int2, &pad_pos);
197 
198  err = ff_opencl_filter_work_size_from_image(avctx, global_work, output_frame, p, 16);
199  if (err < 0)
200  goto fail;
201 
202  cle = clEnqueueNDRangeKernel(pad_ctx->command_queue, pad_ctx->kernel_pad, 2, NULL,
203  global_work, NULL, 0, NULL, NULL);
204 
205  CL_FAIL_ON_ERROR(AVERROR(EIO), "Failed to enqueue pad kernel: %d.\n", cle);
206  }
207 
208  // Run queued kernel
209  cle = clFinish(pad_ctx->command_queue);
210  CL_FAIL_ON_ERROR(AVERROR(EIO), "Failed to finish command queue: %d.\n", cle);
211 
212  err = av_frame_copy_props(output_frame, input_frame);
213  if (err < 0)
214  goto fail;
215 
216  av_frame_free(&input_frame);
217 
218  return ff_filter_frame(outlink, output_frame);
219 
220 fail:
221  clFinish(pad_ctx->command_queue);
222  av_frame_free(&input_frame);
223  av_frame_free(&output_frame);
224  return err;
225 }
226 
228 {
229  PadOpenCLContext *ctx = avctx->priv;
230  cl_int cle;
231 
232  if (ctx->kernel_pad) {
233  cle = clReleaseKernel(ctx->kernel_pad);
234  if (cle != CL_SUCCESS)
235  av_log(avctx, AV_LOG_ERROR, "Failed to release "
236  "kernel: %d.\n", cle);
237  }
238 
239  if (ctx->command_queue) {
240  cle = clReleaseCommandQueue(ctx->command_queue);
241  if (cle != CL_SUCCESS)
242  av_log(avctx, AV_LOG_ERROR, "Failed to release "
243  "command queue: %d.\n", cle);
244  }
245 
247 }
248 
250 {
251  AVFilterContext *avctx = outlink->src;
252  AVFilterLink *inlink = avctx->inputs[0];
253  PadOpenCLContext *ctx = avctx->priv;
254  AVRational adjusted_aspect = ctx->aspect;
255  double var_values[VARS_NB], res;
256  int err, ret;
257  char *expr;
258 
259  var_values[VAR_IN_W] = var_values[VAR_IW] = inlink->w;
260  var_values[VAR_IN_H] = var_values[VAR_IH] = inlink->h;
261  var_values[VAR_OUT_W] = var_values[VAR_OW] = NAN;
262  var_values[VAR_OUT_H] = var_values[VAR_OH] = NAN;
263  var_values[VAR_A] = (double) inlink->w / inlink->h;
264  var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?
265  (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
266  var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR];
267 
268  av_expr_parse_and_eval(&res, (expr = ctx->w_expr),
269  var_names, var_values,
270  NULL, NULL, NULL, NULL, NULL, 0, ctx);
271  ctx->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;
272  if ((ret = av_expr_parse_and_eval(&res, (expr = ctx->h_expr),
273  var_names, var_values,
274  NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
275  return ret;
276  ctx->h = var_values[VAR_OUT_H] = var_values[VAR_OH] = res;
277  if (!ctx->h)
278  var_values[VAR_OUT_H] = var_values[VAR_OH] = ctx->h = inlink->h;
279 
280  /* evaluate the width again, as it may depend on the evaluated output height */
281  if ((ret = av_expr_parse_and_eval(&res, (expr = ctx->w_expr),
282  var_names, var_values,
283  NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
284  return ret;
285  ctx->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;
286  if (!ctx->w)
287  var_values[VAR_OUT_W] = var_values[VAR_OW] = ctx->w = inlink->w;
288 
289  if (adjusted_aspect.num && adjusted_aspect.den) {
290  adjusted_aspect = av_div_q(adjusted_aspect, inlink->sample_aspect_ratio);
291  if (ctx->h < av_rescale(ctx->w, adjusted_aspect.den, adjusted_aspect.num)) {
292  ctx->h = var_values[VAR_OUT_H] = var_values[VAR_OH] = av_rescale(ctx->w, adjusted_aspect.den, adjusted_aspect.num);
293  } else {
294  ctx->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = av_rescale(ctx->h, adjusted_aspect.num, adjusted_aspect.den);
295  }
296  }
297 
298  /* evaluate x and y */
299  av_expr_parse_and_eval(&res, (expr = ctx->x_expr),
300  var_names, var_values,
301  NULL, NULL, NULL, NULL, NULL, 0, ctx);
302  ctx->x = var_values[VAR_X] = res;
303  if ((ret = av_expr_parse_and_eval(&res, (expr = ctx->y_expr),
304  var_names, var_values,
305  NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
306  return ret;
307  ctx->y = var_values[VAR_Y] = res;
308  /* evaluate x again, as it may depend on the evaluated y value */
309  if ((ret = av_expr_parse_and_eval(&res, (expr = ctx->x_expr),
310  var_names, var_values,
311  NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
312  return ret;
313  ctx->x = var_values[VAR_X] = res;
314 
315  if (ctx->x < 0 || ctx->x + inlink->w > ctx->w)
316  ctx->x = var_values[VAR_X] = (ctx->w - inlink->w) / 2;
317  if (ctx->y < 0 || ctx->y + inlink->h > ctx->h)
318  ctx->y = var_values[VAR_Y] = (ctx->h - inlink->h) / 2;
319 
320  /* sanity check params */
321  if (ctx->w < inlink->w || ctx->h < inlink->h) {
322  av_log(ctx, AV_LOG_ERROR, "Padded dimensions cannot be smaller than input dimensions.\n");
323  return AVERROR(EINVAL);
324  }
325 
326  if (ctx->w > avctx->inputs[0]->w) {
327  ctx->ocf.output_width = ctx->w;
328  } else {
329  ctx->ocf.output_width = avctx->inputs[0]->w;
330  }
331 
332  if (ctx->h > avctx->inputs[0]->h) {
333  ctx->ocf.output_height = ctx->h;
334  } else {
335  ctx->ocf.output_height = avctx->inputs[0]->h;
336  }
337 
338  if (ctx->x + avctx->inputs[0]->w > ctx->ocf.output_width ||
339  ctx->y + avctx->inputs[0]->h > ctx->ocf.output_height) {
340  return AVERROR(EINVAL);
341  }
342 
343  err = ff_opencl_filter_config_output(outlink);
344  if (err < 0)
345  return err;
346 
347  return 0;
348 }
349 
350 static const AVFilterPad pad_opencl_inputs[] = {
351  {
352  .name = "default",
353  .type = AVMEDIA_TYPE_VIDEO,
354  .filter_frame = filter_frame,
355  .config_props = &ff_opencl_filter_config_input,
356  },
357  { NULL }
358 };
359 
360 static const AVFilterPad pad_opencl_outputs[] = {
361  {
362  .name = "default",
363  .type = AVMEDIA_TYPE_VIDEO,
364  .config_props = &pad_opencl_config_output,
365  },
366  { NULL }
367 };
368 
369 #define OFFSET(x) offsetof(PadOpenCLContext, x)
370 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
371 
372 static const AVOption pad_opencl_options[] = {
373  { "width", "set the pad area width", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, 0, 0, FLAGS },
374  { "w", "set the pad area width", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, 0, 0, FLAGS },
375  { "height", "set the pad area height", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, 0, 0, FLAGS },
376  { "h", "set the pad area height", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, 0, 0, FLAGS },
377  { "x", "set the x offset for the input image position", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "0"}, 0, INT16_MAX, FLAGS },
378  { "y", "set the y offset for the input image position", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "0"}, 0, INT16_MAX, FLAGS },
379  { "color", "set the color of the padded area border", OFFSET(pad_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, 0, 0, FLAGS },
380  { "aspect", "pad to fit an aspect instead of a resolution", OFFSET(aspect), AV_OPT_TYPE_RATIONAL, {.dbl = 0}, 0, INT16_MAX, FLAGS },
381  { NULL }
382 };
383 
384 AVFILTER_DEFINE_CLASS(pad_opencl);
385 
387  .name = "pad_opencl",
388  .description = NULL_IF_CONFIG_SMALL("Pad the input video."),
389  .priv_size = sizeof(PadOpenCLContext),
390  .priv_class = &pad_opencl_class,
394  .inputs = pad_opencl_inputs,
395  .outputs = pad_opencl_outputs,
396  .flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE
397 };
#define NULL
Definition: coverity.c:32
#define FF_FILTER_FLAG_HWFRAME_AWARE
The filter is aware of hardware frames, and any hardware frame context should not be automatically pr...
Definition: internal.h:365
static int pad_opencl_config_output(AVFilterLink *outlink)
#define RGB_TO_Y_BT709(r, g, b)
Definition: colorspace.h:126
AVRational av_div_q(AVRational b, AVRational c)
Divide one rational by another.
Definition: rational.c:88
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2549
This structure describes decoded (raw) audio or video data.
Definition: frame.h:300
AVOption.
Definition: opt.h:246
int ff_opencl_filter_work_size_from_image(AVFilterContext *avctx, size_t *work_size, AVFrame *frame, int plane, int block_alignment)
Find the work size needed needed for a given plane of an image.
Definition: opencl.c:278
int ff_opencl_filter_config_input(AVFilterLink *inlink)
Check that the input link contains a suitable hardware frames context and extract the device from it...
Definition: opencl.c:60
int ff_opencl_filter_query_formats(AVFilterContext *avctx)
Return that all inputs and outputs support only AV_PIX_FMT_OPENCL.
Definition: opencl.c:28
misc image utilities
Main libavfilter public API header.
const char * desc
Definition: nvenc.c:79
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
AVFILTER_DEFINE_CLASS(pad_opencl)
int num
Numerator.
Definition: rational.h:59
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
Definition: video.c:104
int ff_opencl_filter_init(AVFilterContext *avctx)
Initialise an OpenCL filter context.
Definition: opencl.c:147
AVOpenCLDeviceContext * hwctx
Definition: opencl.h:41
AVBufferRef * hw_frames_ctx
For hwaccel-format frames, this should be a reference to the AVHWFramesContext describing the frame...
Definition: frame.h:639
const char * name
Pad name.
Definition: internal.h:60
cl_float4 pad_color_float
Definition: vf_pad_opencl.c:77
AVFilterLink ** inputs
array of pointers to input links
Definition: avfilter.h:346
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1075
const char * ff_opencl_source_pad
Definition: pad.c:2
uint8_t
#define av_cold
Definition: attributes.h:88
static av_cold int uninit(AVCodecContext *avctx)
Definition: crystalhd.c:279
AVOptions.
uint8_t pad_rgba[4]
Definition: vf_pad_opencl.c:75
cl_device_id device_id
The primary device ID of the device.
#define RGB_TO_V_BT709(r1, g1, b1, shift)
Definition: colorspace.h:134
static const AVFilterPad pad_opencl_inputs[]
static const char *const var_names[]
Definition: vf_pad_opencl.c:31
int ff_opencl_filter_config_output(AVFilterLink *outlink)
Create a suitable hardware frames context for the output.
Definition: opencl.c:96
#define av_log(a,...)
#define RGB_TO_U_BT709(r1, g1, b1, shift)
Definition: colorspace.h:130
A filter pad used for either input or output.
Definition: internal.h:54
#define src
Definition: vp8dsp.c:254
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
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
Various defines for YUV<->RGB conversion.
static int filter_frame(AVFilterLink *link, AVFrame *input_frame)
OpenCLFilterContext ocf
Definition: vf_pad_opencl.c:58
#define AVERROR(e)
Definition: error.h:43
#define AV_PIX_FMT_FLAG_RGB
The pixel format contains RGB-like data (as opposed to YUV/grayscale).
Definition: pixdesc.h:148
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:203
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:188
void * priv
private data for use by the filter
Definition: avfilter.h:353
#define fail()
Definition: checkasm.h:123
var_name
Definition: aeval.c:46
cl_command_queue command_queue
Definition: vf_pad_opencl.c:70
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
#define NAN
Definition: mathematics.h:64
#define OFFSET(x)
AVFormatContext * ctx
Definition: movenc.c:48
AVFilter ff_vf_pad_opencl
cl_kernel kernel_pad
Definition: vf_pad_opencl.c:71
static const AVFilterPad inputs[]
Definition: af_acontrast.c:193
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
#define FF_ARRAY_ELEMS(a)
int ff_fill_rgba_map(uint8_t *rgba_map, enum AVPixelFormat pix_fmt)
Definition: drawutils.c:35
misc drawing utilities
#define CL_SET_KERNEL_ARG(kernel, arg_num, type, arg)
set argument to specific Kernel.
Definition: opencl.h:61
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:81
uint8_t * data
The data buffer.
Definition: buffer.h:89
#define FLAGS
static int output_frame(H264Context *h, AVFrame *dst, H264Picture *srcp)
Definition: h264dec.c:853
Filter definition.
Definition: avfilter.h:144
Rational number (pair of numerator and denominator).
Definition: rational.h:58
This struct describes a set or pool of "hardware" frames (i.e.
Definition: hwcontext.h:124
const char * name
Filter name.
Definition: avfilter.h:148
AVRational aspect
Definition: vf_pad_opencl.c:68
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:350
#define CL_FAIL_ON_ERROR(errcode,...)
A helper macro to handle OpenCL errors.
Definition: opencl.h:74
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:314
static int query_formats(AVFilterContext *ctx)
Definition: aeval.c:244
static const AVOption pad_opencl_options[]
void ff_opencl_filter_uninit(AVFilterContext *avctx)
Uninitialise an OpenCL filter context.
Definition: opencl.c:156
int den
Denominator.
Definition: rational.h:60
cl_context context
The OpenCL context which will contain all operations and frames on this device.
static av_cold void pad_opencl_uninit(AVFilterContext *avctx)
An instance of a filter.
Definition: avfilter.h:338
cl_program program
Definition: opencl.h:43
int ff_opencl_filter_load_program(AVFilterContext *avctx, const char **program_source_array, int nb_strings)
Load a new OpenCL program from strings in memory.
Definition: opencl.c:171
static int pad_opencl_init(AVFilterContext *avctx, AVFrame *input_frame)
Definition: vf_pad_opencl.c:81
internal API functions
enum AVPixelFormat sw_format
The pixel format identifying the actual data layout of the hardware frames.
Definition: hwcontext.h:222
static const AVFilterPad pad_opencl_outputs[]
#define AV_PIX_FMT_FLAG_PLANAR
At least one pixel component is not in the first data plane.
Definition: pixdesc.h:144
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
Definition: frame.c:659
simple arithmetic expression evaluator
uint8_t pad_color[4]
Definition: vf_pad_opencl.c:76