aboutsummaryrefslogtreecommitdiffstats
path: root/libavfilter/vf_scale_cuda.c
blob: 23ac27a7dc4c0176d4e975721033a6bf92bfe7b6 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
/*
* Copyright (c) 2017, NVIDIA CORPORATION. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/

#include <cuda.h>
#include <stdio.h>
#include <string.h>

#include "libavutil/avstring.h"
#include "libavutil/common.h"
#include "libavutil/hwcontext.h"
#include "libavutil/hwcontext_cuda_internal.h"
#include "libavutil/internal.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"

#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "scale.h"
#include "video.h"

static const enum AVPixelFormat supported_formats[] = {
    AV_PIX_FMT_YUV420P,
    AV_PIX_FMT_NV12,
    AV_PIX_FMT_YUV444P,
    AV_PIX_FMT_P010,
    AV_PIX_FMT_P016
};

#define DIV_UP(a, b) ( ((a) + (b) - 1) / (b) )
#define ALIGN_UP(a, b) (((a) + (b) - 1) & ~((b) - 1))
#define NUM_BUFFERS 2
#define BLOCKX 32
#define BLOCKY 16

typedef struct CUDAScaleContext {
    const AVClass *class;
    enum AVPixelFormat in_fmt;
    enum AVPixelFormat out_fmt;

    struct {
        int width;
        int height;
    } planes_in[3], planes_out[3];

    AVBufferRef *frames_ctx;
    AVFrame     *frame;

    AVFrame *tmp_frame;
    int passthrough;

    /**
     * Output sw format. AV_PIX_FMT_NONE for no conversion.
     */
    enum AVPixelFormat format;

    char *w_expr;               ///< width  expression string
    char *h_expr;               ///< height expression string

    CUcontext   cu_ctx;
    CUevent     cu_event;
    CUmodule    cu_module;
    CUfunction  cu_func_uchar;
    CUfunction  cu_func_uchar2;
    CUfunction  cu_func_uchar4;
    CUfunction  cu_func_ushort;
    CUfunction  cu_func_ushort2;
    CUfunction  cu_func_ushort4;
    CUtexref    cu_tex_uchar;
    CUtexref    cu_tex_uchar2;
    CUtexref    cu_tex_uchar4;
    CUtexref    cu_tex_ushort;
    CUtexref    cu_tex_ushort2;
    CUtexref    cu_tex_ushort4;

    CUdeviceptr srcBuffer;
    CUdeviceptr dstBuffer;
    int         tex_alignment;
} CUDAScaleContext;

static av_cold int cudascale_init(AVFilterContext *ctx)
{
    CUDAScaleContext *s = ctx->priv;

    s->format = AV_PIX_FMT_NONE;
    s->frame = av_frame_alloc();
    if (!s->frame)
        return AVERROR(ENOMEM);

    s->tmp_frame = av_frame_alloc();
    if (!s->tmp_frame)
        return AVERROR(ENOMEM);

    return 0;
}

static av_cold void cudascale_uninit(AVFilterContext *ctx)
{
    CUDAScaleContext *s = ctx->priv;

    av_frame_free(&s->frame);
    av_buffer_unref(&s->frames_ctx);
    av_frame_free(&s->tmp_frame);
}

static int cudascale_query_formats(AVFilterContext *ctx)
{
    static const enum AVPixelFormat pixel_formats[] = {
        AV_PIX_FMT_CUDA, AV_PIX_FMT_NONE,
    };
    AVFilterFormats *pix_fmts = ff_make_format_list(pixel_formats);

    return ff_set_common_formats(ctx, pix_fmts);
}

static av_cold int init_stage(CUDAScaleContext *s, AVBufferRef *device_ctx)
{
    AVBufferRef *out_ref = NULL;
    AVHWFramesContext *out_ctx;
    int in_sw, in_sh, out_sw, out_sh;
    int ret, i;

    av_pix_fmt_get_chroma_sub_sample(s->in_fmt,  &in_sw,  &in_sh);
    av_pix_fmt_get_chroma_sub_sample(s->out_fmt, &out_sw, &out_sh);
    if (!s->planes_out[0].width) {
        s->planes_out[0].width  = s->planes_in[0].width;
        s->planes_out[0].height = s->planes_in[0].height;
    }

    for (i = 1; i < FF_ARRAY_ELEMS(s->planes_in); i++) {
        s->planes_in[i].width   = s->planes_in[0].width   >> in_sw;
        s->planes_in[i].height  = s->planes_in[0].height  >> in_sh;
        s->planes_out[i].width  = s->planes_out[0].width  >> out_sw;
        s->planes_out[i].height = s->planes_out[0].height >> out_sh;
    }

    out_ref = av_hwframe_ctx_alloc(device_ctx);
    if (!out_ref)
        return AVERROR(ENOMEM);
    out_ctx = (AVHWFramesContext*)out_ref->data;

    out_ctx->format    = AV_PIX_FMT_CUDA;
    out_ctx->sw_format = s->out_fmt;
    out_ctx->width     = FFALIGN(s->planes_out[0].width,  32);
    out_ctx->height    = FFALIGN(s->planes_out[0].height, 32);

    ret = av_hwframe_ctx_init(out_ref);
    if (ret < 0)
        goto fail;

    av_frame_unref(s->frame);
    ret = av_hwframe_get_buffer(out_ref, s->frame, 0);
    if (ret < 0)
        goto fail;

    s->frame->width  = s->planes_out[0].width;
    s->frame->height = s->planes_out[0].height;

    av_buffer_unref(&s->frames_ctx);
    s->frames_ctx = out_ref;

    return 0;
fail:
    av_buffer_unref(&out_ref);
    return ret;
}

static int format_is_supported(enum AVPixelFormat fmt)
{
    int i;

    for (i = 0; i < FF_ARRAY_ELEMS(supported_formats); i++)
        if (supported_formats[i] == fmt)
            return 1;
    return 0;
}

static av_cold int init_processing_chain(AVFilterContext *ctx, int in_width, int in_height,
                                         int out_width, int out_height)
{
    CUDAScaleContext *s = ctx->priv;

    AVHWFramesContext *in_frames_ctx;

    enum AVPixelFormat in_format;
    enum AVPixelFormat out_format;
    int ret;

    /* check that we have a hw context */
    if (!ctx->inputs[0]->hw_frames_ctx) {
        av_log(ctx, AV_LOG_ERROR, "No hw context provided on input\n");
        return AVERROR(EINVAL);
    }
    in_frames_ctx = (AVHWFramesContext*)ctx->inputs[0]->hw_frames_ctx->data;
    in_format     = in_frames_ctx->sw_format;
    out_format    = (s->format == AV_PIX_FMT_NONE) ? in_format : s->format;

    if (!format_is_supported(in_format)) {
        av_log(ctx, AV_LOG_ERROR, "Unsupported input format: %s\n",
               av_get_pix_fmt_name(in_format));
        return AVERROR(ENOSYS);
    }
    if (!format_is_supported(out_format)) {
        av_log(ctx, AV_LOG_ERROR, "Unsupported output format: %s\n",
               av_get_pix_fmt_name(out_format));
        return AVERROR(ENOSYS);
    }

    if (in_width == out_width && in_height == out_height)
        s->passthrough = 1;

    s->in_fmt = in_format;
    s->out_fmt = out_format;

    s->planes_in[0].width   = in_width;
    s->planes_in[0].height  = in_height;
    s->planes_out[0].width  = out_width;
    s->planes_out[0].height = out_height;

    ret = init_stage(s, in_frames_ctx->device_ref);
    if (ret < 0)
        return ret;

    ctx->outputs[0]->hw_frames_ctx = av_buffer_ref(s->frames_ctx);
    if (!ctx->outputs[0]->hw_frames_ctx)
        return AVERROR(ENOMEM);

    return 0;
}

static av_cold int cudascale_config_props(AVFilterLink *outlink)
{
    AVFilterContext *ctx = outlink->src;
    AVFilterLink *inlink = outlink->src->inputs[0];
    CUDAScaleContext *s  = ctx->priv;
    AVHWFramesContext     *frames_ctx = (AVHWFramesContext*)inlink->hw_frames_ctx->data;
    AVCUDADeviceContext *device_hwctx = frames_ctx->device_ctx->hwctx;
    CUcontext dummy, cuda_ctx = device_hwctx->cuda_ctx;
    CUresult err;
    int w, h;
    int ret;

    extern char vf_scale_cuda_ptx[];

    err = cuCtxPushCurrent(cuda_ctx);
    if (err != CUDA_SUCCESS) {
        av_log(ctx, AV_LOG_ERROR, "Error pushing cuda context\n");
        ret = AVERROR_UNKNOWN;
        goto fail;
    }

    err = cuModuleLoadData(&s->cu_module, vf_scale_cuda_ptx);
    if (err != CUDA_SUCCESS) {
        av_log(ctx, AV_LOG_ERROR, "Error loading module data\n");
        ret = AVERROR_UNKNOWN;
        goto fail;
    }

    cuModuleGetFunction(&s->cu_func_uchar, s->cu_module, "Subsample_Bilinear_uchar");
    cuModuleGetFunction(&s->cu_func_uchar2, s->cu_module, "Subsample_Bilinear_uchar2");
    cuModuleGetFunction(&s->cu_func_uchar4, s->cu_module, "Subsample_Bilinear_uchar4");
    cuModuleGetFunction(&s->cu_func_ushort, s->cu_module, "Subsample_Bilinear_ushort");
    cuModuleGetFunction(&s->cu_func_ushort2, s->cu_module, "Subsample_Bilinear_ushort2");
    cuModuleGetFunction(&s->cu_func_ushort4, s->cu_module, "Subsample_Bilinear_ushort4");

    cuModuleGetTexRef(&s->cu_tex_uchar, s->cu_module, "uchar_tex");
    cuModuleGetTexRef(&s->cu_tex_uchar2, s->cu_module, "uchar2_tex");
    cuModuleGetTexRef(&s->cu_tex_uchar4, s->cu_module, "uchar4_tex");
    cuModuleGetTexRef(&s->cu_tex_ushort, s->cu_module, "ushort_tex");
    cuModuleGetTexRef(&s->cu_tex_ushort2, s->cu_module, "ushort2_tex");
    cuModuleGetTexRef(&s->cu_tex_ushort4, s->cu_module, "ushort4_tex");

    cuTexRefSetFlags(s->cu_tex_uchar, CU_TRSF_READ_AS_INTEGER);
    cuTexRefSetFlags(s->cu_tex_uchar2, CU_TRSF_READ_AS_INTEGER);
    cuTexRefSetFlags(s->cu_tex_uchar4, CU_TRSF_READ_AS_INTEGER);
    cuTexRefSetFlags(s->cu_tex_ushort, CU_TRSF_READ_AS_INTEGER);
    cuTexRefSetFlags(s->cu_tex_ushort2, CU_TRSF_READ_AS_INTEGER);
    cuTexRefSetFlags(s->cu_tex_ushort4, CU_TRSF_READ_AS_INTEGER);

    cuTexRefSetFilterMode(s->cu_tex_uchar, CU_TR_FILTER_MODE_LINEAR);
    cuTexRefSetFilterMode(s->cu_tex_uchar2, CU_TR_FILTER_MODE_LINEAR);
    cuTexRefSetFilterMode(s->cu_tex_uchar4, CU_TR_FILTER_MODE_LINEAR);
    cuTexRefSetFilterMode(s->cu_tex_ushort, CU_TR_FILTER_MODE_LINEAR);
    cuTexRefSetFilterMode(s->cu_tex_ushort2, CU_TR_FILTER_MODE_LINEAR);
    cuTexRefSetFilterMode(s->cu_tex_ushort4, CU_TR_FILTER_MODE_LINEAR);

    cuCtxPopCurrent(&dummy);

    if ((ret = ff_scale_eval_dimensions(s,
                                        s->w_expr, s->h_expr,
                                        inlink, outlink,
                                        &w, &h)) < 0)
        goto fail;

    if (((int64_t)h * inlink->w) > INT_MAX  ||
        ((int64_t)w * inlink->h) > INT_MAX)
        av_log(ctx, AV_LOG_ERROR, "Rescaled value for width or height is too big.\n");

    outlink->w = w;
    outlink->h = h;

    ret = init_processing_chain(ctx, inlink->w, inlink->h, w, h);
    if (ret < 0)
        return ret;

    av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d -> w:%d h:%d\n",
           inlink->w, inlink->h, outlink->w, outlink->h);

    if (inlink->sample_aspect_ratio.num) {
        outlink->sample_aspect_ratio = av_mul_q((AVRational){outlink->h*inlink->w,
                                                             outlink->w*inlink->h},
                                                inlink->sample_aspect_ratio);
    } else {
        outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
    }

    return 0;

fail:
    return ret;
}

static int call_resize_kernel(CUDAScaleContext *s, CUfunction func, CUtexref tex, int channels,
                              uint8_t *src_dptr, int src_width, int src_height, int src_pitch,
                              uint8_t *dst_dptr, int dst_width, int dst_height, int dst_pitch,
                              int pixel_size)
{
    CUdeviceptr src_devptr = (CUdeviceptr)src_dptr;
    CUdeviceptr dst_devptr = (CUdeviceptr)dst_dptr;
    void *args_uchar[] = { &dst_devptr, &dst_width, &dst_height, &dst_pitch, &src_width, &src_height };
    CUDA_ARRAY_DESCRIPTOR desc;

    desc.Width  = src_width;
    desc.Height = src_height;
    desc.NumChannels = channels;
    if (pixel_size == 1) {
        desc.Format = CU_AD_FORMAT_UNSIGNED_INT8;
    } else {
        desc.Format = CU_AD_FORMAT_UNSIGNED_INT16;
    }

    cuTexRefSetAddress2D_v3(tex, &desc, src_devptr, src_pitch * pixel_size);
    cuLaunchKernel(func, DIV_UP(dst_width, BLOCKX), DIV_UP(dst_height, BLOCKY), 1, BLOCKX, BLOCKY, 1, 0, 0, args_uchar, NULL);

    return 0;
}

static int scalecuda_resize(AVFilterContext *ctx,
                            AVFrame *out, AVFrame *in)
{
    AVHWFramesContext *in_frames_ctx = (AVHWFramesContext*)in->hw_frames_ctx->data;
    CUDAScaleContext *s = ctx->priv;

    switch (in_frames_ctx->sw_format) {
    case AV_PIX_FMT_YUV420P:
        call_resize_kernel(s, s->cu_func_uchar, s->cu_tex_uchar, 1,
                           in->data[0], in->width, in->height, in->linesize[0],
                           out->data[0], out->width, out->height, out->linesize[0],
                           1);
        call_resize_kernel(s, s->cu_func_uchar, s->cu_tex_uchar, 1,
                           in->data[0]+in->linesize[0]*in->height, in->width/2, in->height/2, in->linesize[0]/2,
                           out->data[0]+out->linesize[0]*out->height, out->width/2, out->height/2, out->linesize[0]/2,
                           1);
        call_resize_kernel(s, s->cu_func_uchar, s->cu_tex_uchar, 1,
                           in->data[0]+ ALIGN_UP((in->linesize[0]*in->height*5)/4, s->tex_alignment), in->width/2, in->height/2, in->linesize[0]/2,
                           out->data[0]+(out->linesize[0]*out->height*5)/4, out->width/2, out->height/2, out->linesize[0]/2,
                           1);
        break;
    case AV_PIX_FMT_YUV444P:
        call_resize_kernel(s, s->cu_func_uchar, s->cu_tex_uchar, 1,
                           in->data[0], in->width, in->height, in->linesize[0],
                           out->data[0], out->width, out->height, out->linesize[0],
                           1);
        call_resize_kernel(s, s->cu_func_uchar, s->cu_tex_uchar, 1,
                           in->data[0]+in->linesize[0]*in->height, in->width, in->height, in->linesize[0],
                           out->data[0]+out->linesize[0]*out->height, out->width, out->height, out->linesize[0],
                           1);
        call_resize_kernel(s, s->cu_func_uchar, s->cu_tex_uchar, 1,
                           in->data[0]+in->linesize[0]*in->height*2, in->width, in->height, in->linesize[0],
                           out->data[0]+out->linesize[0]*out->height*2, out->width, out->height, out->linesize[0],
                           1);
        break;
    case AV_PIX_FMT_NV12:
        call_resize_kernel(s, s->cu_func_uchar, s->cu_tex_uchar, 1,
                           in->data[0], in->width, in->height, in->linesize[0],
                           out->data[0], out->width, out->height, out->linesize[0],
                           1);
        call_resize_kernel(s, s->cu_func_uchar2, s->cu_tex_uchar2, 2,
                           in->data[1], in->width/2, in->height/2, in->linesize[1],
                           out->data[0] + out->linesize[0] * ((out->height + 31) & ~0x1f), out->width/2, out->height/2, out->linesize[1]/2,
                           1);
        break;
    case AV_PIX_FMT_P010LE:
        call_resize_kernel(s, s->cu_func_ushort, s->cu_tex_ushort, 1,
                           in->data[0], in->width, in->height, in->linesize[0]/2,
                           out->data[0], out->width, out->height, out->linesize[0]/2,
                           2);
        call_resize_kernel(s, s->cu_func_ushort2, s->cu_tex_ushort2, 2,
                           in->data[1], in->width / 2, in->height / 2, in->linesize[1]/2,
                           out->data[0] + out->linesize[0] * ((out->height + 31) & ~0x1f), out->width / 2, out->height / 2, out->linesize[1] / 4,
                           2);
        break;
    case AV_PIX_FMT_P016LE:
        call_resize_kernel(s, s->cu_func_ushort, s->cu_tex_ushort, 1,
                           in->data[0], in->width, in->height, in->linesize[0] / 2,
                           out->data[0], out->width, out->height, out->linesize[0] / 2,
                           2);
        call_resize_kernel(s, s->cu_func_ushort2, s->cu_tex_ushort2, 2,
                           in->data[1], in->width / 2, in->height / 2, in->linesize[1] / 2,
                           out->data[0] + out->linesize[0] * ((out->height + 31) & ~0x1f), out->width / 2, out->height / 2, out->linesize[1] / 4,
                           2);
        break;
    default:
        return AVERROR_BUG;
    }

    return 0;
}

static int cudascale_scale(AVFilterContext *ctx, AVFrame *out, AVFrame *in)
{
    CUDAScaleContext *s = ctx->priv;
    AVFrame *src = in;
    int ret;

    ret = scalecuda_resize(ctx, s->frame, src);
    if (ret < 0)
        return ret;

    src = s->frame;
    ret = av_hwframe_get_buffer(src->hw_frames_ctx, s->tmp_frame, 0);
    if (ret < 0)
        return ret;

    av_frame_move_ref(out, s->frame);
    av_frame_move_ref(s->frame, s->tmp_frame);

    ret = av_frame_copy_props(out, in);
    if (ret < 0)
        return ret;

    return 0;
}

static int cudascale_filter_frame(AVFilterLink *link, AVFrame *in)
{
    AVFilterContext              *ctx = link->dst;
    CUDAScaleContext               *s = ctx->priv;
    AVFilterLink             *outlink = ctx->outputs[0];
    AVHWFramesContext     *frames_ctx = (AVHWFramesContext*)s->frames_ctx->data;
    AVCUDADeviceContext *device_hwctx = frames_ctx->device_ctx->hwctx;

    AVFrame *out = NULL;
    CUresult err;
    CUcontext dummy;
    int ret = 0;

    out = av_frame_alloc();
    if (!out) {
        ret = AVERROR(ENOMEM);
        goto fail;
    }

    err = cuCtxPushCurrent(device_hwctx->cuda_ctx);
    if (err != CUDA_SUCCESS) {
        ret = AVERROR_UNKNOWN;
        goto fail;
    }

    ret = cudascale_scale(ctx, out, in);

    cuCtxPopCurrent(&dummy);
    if (ret < 0)
        goto fail;

    av_reduce(&out->sample_aspect_ratio.num, &out->sample_aspect_ratio.den,
              (int64_t)in->sample_aspect_ratio.num * outlink->h * link->w,
              (int64_t)in->sample_aspect_ratio.den * outlink->w * link->h,
              INT_MAX);

    av_frame_free(&in);
    return ff_filter_frame(outlink, out);
fail:
    av_frame_free(&in);
    av_frame_free(&out);
    return ret;
}

#define OFFSET(x) offsetof(CUDAScaleContext, x)
#define FLAGS (AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM)
static const AVOption options[] = {
    { "w",      "Output video width",  OFFSET(w_expr),     AV_OPT_TYPE_STRING, { .str = "iw"   }, .flags = FLAGS },
    { "h",      "Output video height", OFFSET(h_expr),     AV_OPT_TYPE_STRING, { .str = "ih"   }, .flags = FLAGS },
    { NULL },
};

static const AVClass cudascale_class = {
    .class_name = "cudascale",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
};

static const AVFilterPad cudascale_inputs[] = {
    {
        .name        = "default",
        .type        = AVMEDIA_TYPE_VIDEO,
        .filter_frame = cudascale_filter_frame,
    },
    { NULL }
};

static const AVFilterPad cudascale_outputs[] = {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_VIDEO,
        .config_props = cudascale_config_props,
    },
    { NULL }
};

AVFilter ff_vf_scale_cuda = {
    .name      = "scale_cuda",
    .description = NULL_IF_CONFIG_SMALL("GPU accelerated video resizer"),

    .init          = cudascale_init,
    .uninit        = cudascale_uninit,
    .query_formats = cudascale_query_formats,

    .priv_size = sizeof(CUDAScaleContext),
    .priv_class = &cudascale_class,

    .inputs    = cudascale_inputs,
    .outputs   = cudascale_outputs,

    .flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE,
};