/*
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <string.h>
 
 #include <va/va.h>
 #include <va/va_vpp.h>
 
 #include "libavutil/avassert.h"

 #include "libavutil/common.h"

 #include "libavutil/hwcontext.h"
 #include "libavutil/hwcontext_vaapi.h"
 #include "libavutil/mem.h"
 #include "libavutil/opt.h"
 #include "libavutil/pixdesc.h"
 
 #include "avfilter.h"
 #include "formats.h"
 #include "internal.h"
 #include "video.h"
 
 #define MAX_REFERENCES 8
 
 typedef struct DeintVAAPIContext {
     const AVClass     *class;
 
     AVVAAPIDeviceContext *hwctx;
     AVBufferRef       *device_ref;
 
     int                mode;

     int                field_rate;
     int                auto_enable;

 
     int                valid_ids;
     VAConfigID         va_config;
     VAContextID        va_context;
 
     AVBufferRef       *input_frames_ref;
     AVHWFramesContext *input_frames;
 
     AVBufferRef       *output_frames_ref;
     AVHWFramesContext *output_frames;
     int                output_height;
     int                output_width;
 
     VAProcFilterCapDeinterlacing
                        deint_caps[VAProcDeinterlacingCount];
     int             nb_deint_caps;
     VAProcPipelineCaps pipeline_caps;
 
     int                queue_depth;
     int                queue_count;
     AVFrame           *frame_queue[MAX_REFERENCES];

     int                extra_delay_for_timestamps;

 
     VABufferID         filter_buffer;
 } DeintVAAPIContext;
 
 static const char *deint_vaapi_mode_name(int mode)
 {
     switch (mode) {
 #define D(name) case VAProcDeinterlacing ## name: return #name
         D(Bob);
         D(Weave);
         D(MotionAdaptive);
         D(MotionCompensated);
 #undef D
     default:
         return "Invalid";
     }
 }
 
 static int deint_vaapi_query_formats(AVFilterContext *avctx)
 {
     enum AVPixelFormat pix_fmts[] = {
         AV_PIX_FMT_VAAPI, AV_PIX_FMT_NONE,
     };
     int err;
 
     if ((err = ff_formats_ref(ff_make_format_list(pix_fmts),
                               &avctx->inputs[0]->out_formats)) < 0)
         return err;
     if ((err = ff_formats_ref(ff_make_format_list(pix_fmts),
                               &avctx->outputs[0]->in_formats)) < 0)
         return err;
 
     return 0;
 }
 
 static int deint_vaapi_pipeline_uninit(AVFilterContext *avctx)
 {
     DeintVAAPIContext *ctx = avctx->priv;
     int i;
 
     for (i = 0; i < ctx->queue_count; i++)
         av_frame_free(&ctx->frame_queue[i]);
     ctx->queue_count = 0;
 
     if (ctx->filter_buffer != VA_INVALID_ID) {
         vaDestroyBuffer(ctx->hwctx->display, ctx->filter_buffer);
         ctx->filter_buffer = VA_INVALID_ID;
     }
 
     if (ctx->va_context != VA_INVALID_ID) {
         vaDestroyContext(ctx->hwctx->display, ctx->va_context);
         ctx->va_context = VA_INVALID_ID;
     }
 
     if (ctx->va_config != VA_INVALID_ID) {
         vaDestroyConfig(ctx->hwctx->display, ctx->va_config);
         ctx->va_config = VA_INVALID_ID;
     }
 
     av_buffer_unref(&ctx->device_ref);
     ctx->hwctx = NULL;
 
     return 0;
 }
 
 static int deint_vaapi_config_input(AVFilterLink *inlink)
 {
     AVFilterContext   *avctx = inlink->dst;
     DeintVAAPIContext *ctx = avctx->priv;
 
     deint_vaapi_pipeline_uninit(avctx);
 
     if (!inlink->hw_frames_ctx) {
         av_log(avctx, AV_LOG_ERROR, "A hardware frames reference is "
                "required to associate the processing device.\n");
         return AVERROR(EINVAL);
     }
 
     ctx->input_frames_ref = av_buffer_ref(inlink->hw_frames_ctx);
     ctx->input_frames = (AVHWFramesContext*)ctx->input_frames_ref->data;
 
     return 0;
 }
 
 static int deint_vaapi_build_filter_params(AVFilterContext *avctx)
 {
     DeintVAAPIContext *ctx = avctx->priv;
     VAStatus vas;
     VAProcFilterParameterBufferDeinterlacing params;
     int i;
 
     ctx->nb_deint_caps = VAProcDeinterlacingCount;
     vas = vaQueryVideoProcFilterCaps(ctx->hwctx->display,
                                      ctx->va_context,
                                      VAProcFilterDeinterlacing,
                                      &ctx->deint_caps,
                                      &ctx->nb_deint_caps);
     if (vas != VA_STATUS_SUCCESS) {
         av_log(avctx, AV_LOG_ERROR, "Failed to query deinterlacing "
                "caps: %d (%s).\n", vas, vaErrorStr(vas));
         return AVERROR(EIO);
     }
 
     if (ctx->mode == VAProcDeinterlacingNone) {
         for (i = 0; i < ctx->nb_deint_caps; i++) {
             if (ctx->deint_caps[i].type > ctx->mode)
                 ctx->mode = ctx->deint_caps[i].type;
         }
         av_log(avctx, AV_LOG_VERBOSE, "Picking %d (%s) as default "
                "deinterlacing mode.\n", ctx->mode,
                deint_vaapi_mode_name(ctx->mode));
     } else {
         for (i = 0; i < ctx->nb_deint_caps; i++) {
             if (ctx->deint_caps[i].type == ctx->mode)
                 break;
         }
         if (i >= ctx->nb_deint_caps) {
             av_log(avctx, AV_LOG_ERROR, "Deinterlacing mode %d (%s) is "
                    "not supported.\n", ctx->mode,
                    deint_vaapi_mode_name(ctx->mode));
         }
     }
 
     params.type      = VAProcFilterDeinterlacing;
     params.algorithm = ctx->mode;
     params.flags     = 0;
 
     av_assert0(ctx->filter_buffer == VA_INVALID_ID);
     vas = vaCreateBuffer(ctx->hwctx->display, ctx->va_context,
                          VAProcFilterParameterBufferType,
                          sizeof(params), 1, &params,
                          &ctx->filter_buffer);
     if (vas != VA_STATUS_SUCCESS) {
         av_log(avctx, AV_LOG_ERROR, "Failed to create deinterlace "
                "parameter buffer: %d (%s).\n", vas, vaErrorStr(vas));
         return AVERROR(EIO);
     }
 
     vas = vaQueryVideoProcPipelineCaps(ctx->hwctx->display,
                                        ctx->va_context,
                                        &ctx->filter_buffer, 1,
                                        &ctx->pipeline_caps);
     if (vas != VA_STATUS_SUCCESS) {
         av_log(avctx, AV_LOG_ERROR, "Failed to query pipeline "
                "caps: %d (%s).\n", vas, vaErrorStr(vas));
         return AVERROR(EIO);
     }
 

     ctx->extra_delay_for_timestamps = ctx->field_rate == 2 &&
         ctx->pipeline_caps.num_backward_references == 0;
 

     ctx->queue_depth = ctx->pipeline_caps.num_backward_references +

                        ctx->pipeline_caps.num_forward_references +
                        ctx->extra_delay_for_timestamps + 1;

     if (ctx->queue_depth > MAX_REFERENCES) {
         av_log(avctx, AV_LOG_ERROR, "Pipeline requires too many "
                "references (%u forward, %u back).\n",
                ctx->pipeline_caps.num_forward_references,
                ctx->pipeline_caps.num_backward_references);
         return AVERROR(ENOSYS);
     }
 
     return 0;
 }
 
 static int deint_vaapi_config_output(AVFilterLink *outlink)
 {
     AVFilterContext    *avctx = outlink->src;

     AVFilterLink      *inlink = avctx->inputs[0];

     DeintVAAPIContext    *ctx = avctx->priv;
     AVVAAPIHWConfig *hwconfig = NULL;
     AVHWFramesConstraints *constraints = NULL;
     AVVAAPIFramesContext *va_frames;
     VAStatus vas;
     int err;
 
     deint_vaapi_pipeline_uninit(avctx);
 
     av_assert0(ctx->input_frames);
     ctx->device_ref = av_buffer_ref(ctx->input_frames->device_ref);
     ctx->hwctx = ((AVHWDeviceContext*)ctx->device_ref->data)->hwctx;
 
     ctx->output_width  = ctx->input_frames->width;
     ctx->output_height = ctx->input_frames->height;
 
     av_assert0(ctx->va_config == VA_INVALID_ID);
     vas = vaCreateConfig(ctx->hwctx->display, VAProfileNone,
                          VAEntrypointVideoProc, 0, 0, &ctx->va_config);
     if (vas != VA_STATUS_SUCCESS) {
         av_log(avctx, AV_LOG_ERROR, "Failed to create processing pipeline "
                "config: %d (%s).\n", vas, vaErrorStr(vas));
         err = AVERROR(EIO);
         goto fail;
     }
 
     hwconfig = av_hwdevice_hwconfig_alloc(ctx->device_ref);
     if (!hwconfig) {
         err = AVERROR(ENOMEM);
         goto fail;
     }
     hwconfig->config_id = ctx->va_config;
 
     constraints = av_hwdevice_get_hwframe_constraints(ctx->device_ref,
                                                       hwconfig);
     if (!constraints) {
         err = AVERROR(ENOMEM);
         goto fail;
     }
 
     if (ctx->output_width  < constraints->min_width  ||
         ctx->output_height < constraints->min_height ||
         ctx->output_width  > constraints->max_width  ||
         ctx->output_height > constraints->max_height) {
         av_log(avctx, AV_LOG_ERROR, "Hardware does not support "
                "deinterlacing to size %dx%d "
                "(constraints: width %d-%d height %d-%d).\n",
                ctx->output_width, ctx->output_height,
                constraints->min_width,  constraints->max_width,
                constraints->min_height, constraints->max_height);
         err = AVERROR(EINVAL);
         goto fail;
     }
 
     ctx->output_frames_ref = av_hwframe_ctx_alloc(ctx->device_ref);
     if (!ctx->output_frames_ref) {
         av_log(avctx, AV_LOG_ERROR, "Failed to create HW frame context "
                "for output.\n");
         err = AVERROR(ENOMEM);
         goto fail;
     }
 
     ctx->output_frames = (AVHWFramesContext*)ctx->output_frames_ref->data;
 
     ctx->output_frames->format    = AV_PIX_FMT_VAAPI;
     ctx->output_frames->sw_format = ctx->input_frames->sw_format;
     ctx->output_frames->width     = ctx->output_width;
     ctx->output_frames->height    = ctx->output_height;
 
     // The number of output frames we need is determined by what follows
     // the filter.  If it's an encoder with complex frame reference
     // structures then this could be very high.
     ctx->output_frames->initial_pool_size = 10;
 
     err = av_hwframe_ctx_init(ctx->output_frames_ref);
     if (err < 0) {
         av_log(avctx, AV_LOG_ERROR, "Failed to initialise VAAPI frame "
                "context for output: %d\n", err);
         goto fail;
     }
 
     va_frames = ctx->output_frames->hwctx;
 
     av_assert0(ctx->va_context == VA_INVALID_ID);
     vas = vaCreateContext(ctx->hwctx->display, ctx->va_config,
                           ctx->output_width, ctx->output_height, 0,
                           va_frames->surface_ids, va_frames->nb_surfaces,
                           &ctx->va_context);
     if (vas != VA_STATUS_SUCCESS) {
         av_log(avctx, AV_LOG_ERROR, "Failed to create processing pipeline "
                "context: %d (%s).\n", vas, vaErrorStr(vas));
         err = AVERROR(EIO);
         goto fail;
     }
 
     err = deint_vaapi_build_filter_params(avctx);
     if (err < 0)
         goto fail;
 

     outlink->w = inlink->w;
     outlink->h = inlink->h;
 
     outlink->time_base  = av_mul_q(inlink->time_base,
                                    (AVRational) { 1, ctx->field_rate });
     outlink->frame_rate = av_mul_q(inlink->frame_rate,
                                    (AVRational) { ctx->field_rate, 1 });

 
     outlink->hw_frames_ctx = av_buffer_ref(ctx->output_frames_ref);
     if (!outlink->hw_frames_ctx) {
         err = AVERROR(ENOMEM);
         goto fail;
     }
 
     av_freep(&hwconfig);
     av_hwframe_constraints_free(&constraints);
     return 0;
 
 fail:
     av_buffer_unref(&ctx->output_frames_ref);
     av_freep(&hwconfig);
     av_hwframe_constraints_free(&constraints);
     return err;
 }
 
 static int vaapi_proc_colour_standard(enum AVColorSpace av_cs)
 {
     switch(av_cs) {
 #define CS(av, va) case AVCOL_SPC_ ## av: return VAProcColorStandard ## va;
         CS(BT709,     BT709);
         CS(BT470BG,   BT470BG);
         CS(SMPTE170M, SMPTE170M);
         CS(SMPTE240M, SMPTE240M);
 #undef CS
     default:
         return VAProcColorStandardNone;
     }
 }
 
 static int deint_vaapi_filter_frame(AVFilterLink *inlink, AVFrame *input_frame)
 {
     AVFilterContext   *avctx = inlink->dst;
     AVFilterLink    *outlink = avctx->outputs[0];
     DeintVAAPIContext *ctx = avctx->priv;
     AVFrame *output_frame = NULL;
     VASurfaceID input_surface, output_surface;
     VASurfaceID backward_references[MAX_REFERENCES];
     VASurfaceID forward_references[MAX_REFERENCES];
     VAProcPipelineParameterBuffer params;
     VAProcFilterParameterBufferDeinterlacing *filter_params;
     VARectangle input_region;
     VABufferID params_id;
     VAStatus vas;
     void *filter_params_addr = NULL;

     int err, i, field, current_frame_index;

 
     av_log(avctx, AV_LOG_DEBUG, "Filter input: %s, %ux%u (%"PRId64").\n",
            av_get_pix_fmt_name(input_frame->format),
            input_frame->width, input_frame->height, input_frame->pts);
 
     if (ctx->queue_count < ctx->queue_depth) {
         ctx->frame_queue[ctx->queue_count++] = input_frame;
         if (ctx->queue_count < ctx->queue_depth) {
             // Need more reference surfaces before we can continue.
             return 0;
         }
     } else {
         av_frame_free(&ctx->frame_queue[0]);
         for (i = 0; i + 1 < ctx->queue_count; i++)
             ctx->frame_queue[i] = ctx->frame_queue[i + 1];
         ctx->frame_queue[i] = input_frame;
     }
 

     current_frame_index = ctx->pipeline_caps.num_forward_references;
 
     input_frame = ctx->frame_queue[current_frame_index];

     input_surface = (VASurfaceID)(uintptr_t)input_frame->data[3];
     for (i = 0; i < ctx->pipeline_caps.num_forward_references; i++)
         forward_references[i] = (VASurfaceID)(uintptr_t)

             ctx->frame_queue[current_frame_index - i - 1]->data[3];
     for (i = 0; i < ctx->pipeline_caps.num_backward_references; i++)
         backward_references[i] = (VASurfaceID)(uintptr_t)
             ctx->frame_queue[current_frame_index + i + 1]->data[3];

 
     av_log(avctx, AV_LOG_DEBUG, "Using surface %#x for "
            "deinterlace input.\n", input_surface);
     av_log(avctx, AV_LOG_DEBUG, "Backward references:");
     for (i = 0; i < ctx->pipeline_caps.num_backward_references; i++)
         av_log(avctx, AV_LOG_DEBUG, " %#x", backward_references[i]);
     av_log(avctx, AV_LOG_DEBUG, "\n");
     av_log(avctx, AV_LOG_DEBUG, "Forward  references:");
     for (i = 0; i < ctx->pipeline_caps.num_forward_references; i++)
         av_log(avctx, AV_LOG_DEBUG, " %#x", forward_references[i]);
     av_log(avctx, AV_LOG_DEBUG, "\n");
 

     for (field = 0; field < ctx->field_rate; field++) {
         output_frame = ff_get_video_buffer(outlink, ctx->output_width,
                                            ctx->output_height);
         if (!output_frame) {
             err = AVERROR(ENOMEM);
             goto fail;
         }

         output_surface = (VASurfaceID)(uintptr_t)output_frame->data[3];
         av_log(avctx, AV_LOG_DEBUG, "Using surface %#x for "
                "deinterlace output.\n", output_surface);
 
         memset(&params, 0, sizeof(params));
 
         input_region = (VARectangle) {
             .x      = 0,
             .y      = 0,
             .width  = input_frame->width,
             .height = input_frame->height,
         };
 
         params.surface = input_surface;
         params.surface_region = &input_region;
         params.surface_color_standard =
             vaapi_proc_colour_standard(input_frame->colorspace);
 
         params.output_region = NULL;
         params.output_background_color = 0xff000000;
         params.output_color_standard = params.surface_color_standard;
 
         params.pipeline_flags = 0;
         params.filter_flags   = VA_FRAME_PICTURE;
 
         if (!ctx->auto_enable || input_frame->interlaced_frame) {
             vas = vaMapBuffer(ctx->hwctx->display, ctx->filter_buffer,
                               &filter_params_addr);
             if (vas != VA_STATUS_SUCCESS) {
                 av_log(avctx, AV_LOG_ERROR, "Failed to map filter parameter "
                        "buffer: %d (%s).\n", vas, vaErrorStr(vas));
                 err = AVERROR(EIO);
                 goto fail;
             }
             filter_params = filter_params_addr;
             filter_params->flags = 0;
             if (input_frame->top_field_first) {
                 filter_params->flags |= field ? VA_DEINTERLACING_BOTTOM_FIELD : 0;
             } else {
                 filter_params->flags |= VA_DEINTERLACING_BOTTOM_FIELD_FIRST;
                 filter_params->flags |= field ? 0 : VA_DEINTERLACING_BOTTOM_FIELD;
             }
             filter_params_addr = NULL;
             vas = vaUnmapBuffer(ctx->hwctx->display, ctx->filter_buffer);
             if (vas != VA_STATUS_SUCCESS)
                 av_log(avctx, AV_LOG_ERROR, "Failed to unmap filter parameter "
                        "buffer: %d (%s).\n", vas, vaErrorStr(vas));
 
             params.filters     = &ctx->filter_buffer;
             params.num_filters = 1;
 
             params.forward_references = forward_references;
             params.num_forward_references =
                 ctx->pipeline_caps.num_forward_references;
             params.backward_references = backward_references;
             params.num_backward_references =
                 ctx->pipeline_caps.num_backward_references;
 
         } else {
             params.filters     = NULL;
             params.num_filters = 0;
         }

         vas = vaBeginPicture(ctx->hwctx->display,
                              ctx->va_context, output_surface);
         if (vas != VA_STATUS_SUCCESS) {
             av_log(avctx, AV_LOG_ERROR, "Failed to attach new picture: "
                    "%d (%s).\n", vas, vaErrorStr(vas));
             err = AVERROR(EIO);
             goto fail;
         }

         vas = vaCreateBuffer(ctx->hwctx->display, ctx->va_context,
                              VAProcPipelineParameterBufferType,
                              sizeof(params), 1, &params, &params_id);
         if (vas != VA_STATUS_SUCCESS) {
             av_log(avctx, AV_LOG_ERROR, "Failed to create parameter buffer: "
                    "%d (%s).\n", vas, vaErrorStr(vas));
             err = AVERROR(EIO);
             goto fail_after_begin;
         }
         av_log(avctx, AV_LOG_DEBUG, "Pipeline parameter buffer is %#x.\n",
                params_id);

         vas = vaRenderPicture(ctx->hwctx->display, ctx->va_context,
                               &params_id, 1);
         if (vas != VA_STATUS_SUCCESS) {
             av_log(avctx, AV_LOG_ERROR, "Failed to render parameter buffer: "
                    "%d (%s).\n", vas, vaErrorStr(vas));
             err = AVERROR(EIO);
             goto fail_after_begin;
         }

         vas = vaEndPicture(ctx->hwctx->display, ctx->va_context);
         if (vas != VA_STATUS_SUCCESS) {
             av_log(avctx, AV_LOG_ERROR, "Failed to start picture processing: "
                    "%d (%s).\n", vas, vaErrorStr(vas));
             err = AVERROR(EIO);
             goto fail_after_render;
         }

         if (CONFIG_VAAPI_1 || ctx->hwctx->driver_quirks &

             AV_VAAPI_DRIVER_QUIRK_RENDER_PARAM_BUFFERS) {
             vas = vaDestroyBuffer(ctx->hwctx->display, params_id);
             if (vas != VA_STATUS_SUCCESS) {
                 av_log(avctx, AV_LOG_ERROR, "Failed to free parameter buffer: "
                        "%d (%s).\n", vas, vaErrorStr(vas));
                 // And ignore.
             }
         }

         err = av_frame_copy_props(output_frame, input_frame);
         if (err < 0)
             goto fail;

         if (ctx->field_rate == 2) {
             if (field == 0)
                 output_frame->pts = 2 * input_frame->pts;
             else
                 output_frame->pts = input_frame->pts +
                     ctx->frame_queue[current_frame_index + 1]->pts;

         }

         output_frame->interlaced_frame = 0;

         av_log(avctx, AV_LOG_DEBUG, "Filter output: %s, %ux%u (%"PRId64").\n",
                av_get_pix_fmt_name(output_frame->format),
                output_frame->width, output_frame->height, output_frame->pts);

         err = ff_filter_frame(outlink, output_frame);
         if (err < 0)
             break;
     }

     return err;

 
 fail_after_begin:
     vaRenderPicture(ctx->hwctx->display, ctx->va_context, &params_id, 1);
 fail_after_render:
     vaEndPicture(ctx->hwctx->display, ctx->va_context);
 fail:
     if (filter_params_addr)
         vaUnmapBuffer(ctx->hwctx->display, ctx->filter_buffer);
     av_frame_free(&output_frame);
     return err;
 }
 
 static av_cold int deint_vaapi_init(AVFilterContext *avctx)
 {
     DeintVAAPIContext *ctx = avctx->priv;
 
     ctx->va_config     = VA_INVALID_ID;
     ctx->va_context    = VA_INVALID_ID;
     ctx->filter_buffer = VA_INVALID_ID;
     ctx->valid_ids = 1;
 
     return 0;
 }
 
 static av_cold void deint_vaapi_uninit(AVFilterContext *avctx)
 {
     DeintVAAPIContext *ctx = avctx->priv;
 
     if (ctx->valid_ids)
         deint_vaapi_pipeline_uninit(avctx);
 
     av_buffer_unref(&ctx->input_frames_ref);
     av_buffer_unref(&ctx->output_frames_ref);
     av_buffer_unref(&ctx->device_ref);
 }
 
 #define OFFSET(x) offsetof(DeintVAAPIContext, x)
 #define FLAGS (AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM)
 static const AVOption deint_vaapi_options[] = {
     { "mode", "Deinterlacing mode",
       OFFSET(mode), AV_OPT_TYPE_INT, { .i64 = VAProcDeinterlacingNone },
       VAProcDeinterlacingNone, VAProcDeinterlacingCount - 1, FLAGS, "mode" },
     { "default", "Use the highest-numbered (and therefore possibly most advanced) deinterlacing algorithm",
       0, AV_OPT_TYPE_CONST, { .i64 = VAProcDeinterlacingNone }, .unit = "mode" },
     { "bob", "Use the bob deinterlacing algorithm",
       0, AV_OPT_TYPE_CONST, { .i64 = VAProcDeinterlacingBob }, .unit = "mode" },
     { "weave", "Use the weave deinterlacing algorithm",
       0, AV_OPT_TYPE_CONST, { .i64 = VAProcDeinterlacingWeave }, .unit = "mode" },
     { "motion_adaptive", "Use the motion adaptive deinterlacing algorithm",
       0, AV_OPT_TYPE_CONST, { .i64 = VAProcDeinterlacingMotionAdaptive }, .unit = "mode" },
     { "motion_compensated", "Use the motion compensated deinterlacing algorithm",
       0, AV_OPT_TYPE_CONST, { .i64 = VAProcDeinterlacingMotionCompensated }, .unit = "mode" },

 
     { "rate", "Generate output at frame rate or field rate",
       OFFSET(field_rate), AV_OPT_TYPE_INT, { .i64 = 1 }, 1, 2, FLAGS, "rate" },
     { "frame", "Output at frame rate (one frame of output for each field-pair)",
       0, AV_OPT_TYPE_CONST, { .i64 = 1 }, .unit = "rate" },
     { "field", "Output at field rate (one frame of output for each field)",
       0, AV_OPT_TYPE_CONST, { .i64 = 2 }, .unit = "rate" },
 
     { "auto", "Only deinterlace fields, passing frames through unchanged",
       OFFSET(auto_enable), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS },
 

     { NULL },
 };
 
 static const AVClass deint_vaapi_class = {
     .class_name = "deinterlace_vaapi",
     .item_name  = av_default_item_name,
     .option     = deint_vaapi_options,
     .version    = LIBAVUTIL_VERSION_INT,
 };
 
 static const AVFilterPad deint_vaapi_inputs[] = {
     {
         .name         = "default",
         .type         = AVMEDIA_TYPE_VIDEO,
         .filter_frame = &deint_vaapi_filter_frame,
         .config_props = &deint_vaapi_config_input,
     },
     { NULL }
 };
 
 static const AVFilterPad deint_vaapi_outputs[] = {
     {
         .name = "default",
         .type = AVMEDIA_TYPE_VIDEO,
         .config_props = &deint_vaapi_config_output,
     },
     { NULL }
 };
 
 AVFilter ff_vf_deinterlace_vaapi = {
     .name           = "deinterlace_vaapi",
     .description    = NULL_IF_CONFIG_SMALL("Deinterlacing of VAAPI surfaces"),
     .priv_size      = sizeof(DeintVAAPIContext),
     .init           = &deint_vaapi_init,
     .uninit         = &deint_vaapi_uninit,
     .query_formats  = &deint_vaapi_query_formats,
     .inputs         = deint_vaapi_inputs,
     .outputs        = deint_vaapi_outputs,
     .priv_class     = &deint_vaapi_class,

     .flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE,

 };