Video processing API

Classes
struct	VABlendState
	Video blending state definition. More...
struct	VAProcPipelineCaps
	Video processing pipeline capabilities. More...
struct	VAProcFilterValueRange
	Specification of values supported by the filter. More...
struct	VAHdrMetaDataHDR10
	Describes High Dynamic Range Meta Data for HDR10. More...
struct	VAProcFilterCapHighDynamicRange
	Capabilities specification for the High Dynamic Range filter. More...
struct	VAHdrMetaData
	High Dynamic Range Meta Data. More...
struct	VAProcPipelineParameterBuffer
	Video processing pipeline configuration. More...
struct	VAProcFilterParameterBufferBase
	Filter parameter buffer base. More...
struct	VAProcFilterParameterBuffer
	Default filter parametrization. More...
struct	VAProcFilterParameterBufferDeinterlacing
	Deinterlacing filter parametrization. More...
struct	VAProcFilterParameterBufferColorBalance
	Color balance filter parametrization. More...
struct	VAProcFilterParameterBufferTotalColorCorrection
	Total color correction filter parametrization. More...
struct	VAProcFilterParameterBufferHVSNoiseReduction
	Human Vision System(HVS) Noise reduction filter parametrization. More...
struct	VAProcFilterParameterBufferHDRToneMapping
	High Dynamic Range(HDR) Tone Mapping filter parametrization. More...
struct	VAProcFilterParameterBuffer3DLUT
	3DLUT filter parametrization. More...
struct	VAProcFilterCap3DLUT
	Capabilities specification for the 3DLUT filter. More...
struct	VAProcFilterCap
	Default filter cap specification (single range value). More...
struct	VAProcFilterCapDeinterlacing
	Capabilities specification for the deinterlacing filter. More...
struct	VAProcFilterCapColorBalance
	Capabilities specification for the color balance filter. More...
struct	VAProcFilterCapTotalColorCorrection
	Capabilities specification for the Total Color Correction filter. More...

Macros
#define	VA_SOURCE_RANGE_UNKNOWN   0

Enumerations
enum	VAProcFilterType { }
	Video filter types. More...
enum	VAProcDeinterlacingType { }
	Deinterlacing types. More...
enum	VAProcColorBalanceType { }
	Color balance types. More...
enum	VAProcColorStandardType { }
	Color standard types. More...
enum	VAProcTotalColorCorrectionType { }
	Total color correction types. More...
enum	VAProcHighDynamicRangeMetadataType { }
	High Dynamic Range Metadata types. More...
enum	VAProcMode { VAProcDefaultMode = 0 , VAProcPowerSavingMode , VAProcPerformanceMode }
	Video Processing Mode. More...

Functions
VAStatus	vaQueryVideoProcFilters (VADisplay dpy, VAContextID context, VAProcFilterType *filters, unsigned int *num_filters)
	Queries video processing filters. More...
VAStatus	vaQueryVideoProcFilterCaps (VADisplay dpy, VAContextID context, VAProcFilterType type, void *filter_caps, unsigned int *num_filter_caps)
	Queries video filter capabilities. More...
VAStatus	vaQueryVideoProcPipelineCaps (VADisplay dpy, VAContextID context, VABufferID *filters, unsigned int num_filters, VAProcPipelineCaps *pipeline_caps)
	Queries video processing pipeline capabilities. More...

Video blending flags
#define	VA_BLEND_GLOBAL_ALPHA   0x0001
	Global alpha blending.
#define	VA_BLEND_PREMULTIPLIED_ALPHA   0x0002
	Premultiplied alpha blending (RGBA surfaces only).
#define	VA_BLEND_LUMA_KEY   0x0010
	Luma color key (YUV surfaces only).

Video pipeline flags
#define	VA_PROC_PIPELINE_SUBPICTURES   0x00000001
	Specifies whether to apply subpictures when processing a surface.
#define	VA_PROC_PIPELINE_FAST   0x00000002
	Specifies whether to apply power or performance optimizations to a pipeline. More...

Video filter flags
#define	VA_PROC_FILTER_MANDATORY   0x00000001
	Specifies whether the filter shall be present in the pipeline.

Pipeline end flags
#define	VA_PIPELINE_FLAG_END   0x00000004
	Specifies the pipeline is the last.

Chroma Siting flag
#define	VA_CHROMA_SITING_UNKNOWN   0x00
#define	VA_CHROMA_SITING_VERTICAL_TOP   0x01
	Chroma samples are co-sited vertically on the top with the luma samples.
#define	VA_CHROMA_SITING_VERTICAL_CENTER   0x02
	Chroma samples are not co-sited vertically with the luma samples.
#define	VA_CHROMA_SITING_VERTICAL_BOTTOM   0x03
	Chroma samples are co-sited vertically on the bottom with the luma samples.
#define	VA_CHROMA_SITING_HORIZONTAL_LEFT   0x04
	Chroma samples are co-sited horizontally on the left with the luma samples.
#define	VA_CHROMA_SITING_HORIZONTAL_CENTER   0x08
	Chroma samples are not co-sited horizontally with the luma samples.

Tone Mapping flags multiple HDR mode
#define	VA_TONE_MAPPING_HDR_TO_HDR   0x0001
	Tone Mapping from HDR content to HDR display.
#define	VA_TONE_MAPPING_HDR_TO_SDR   0x0002
	Tone Mapping from HDR content to SDR display.
#define	VA_TONE_MAPPING_HDR_TO_EDR   0x0004
	Tone Mapping from HDR content to EDR display.
#define	VA_TONE_MAPPING_SDR_TO_HDR   0x0008
	Tone Mapping from SDR content to HDR display.

De-interlacing flags
#define	VA_DEINTERLACING_BOTTOM_FIELD_FIRST   0x0001
	Bottom field first in the input frame. if this is not set then assumes top field first.
#define	VA_DEINTERLACING_BOTTOM_FIELD   0x0002
	Bottom field used in deinterlacing. if this is not set then assumes top field is used.
#define	VA_DEINTERLACING_ONE_FIELD   0x0004
	A single field is stored in the input frame. if this is not set then assumes the frame contains two interleaved fields.
#define	VA_DEINTERLACING_FMD_ENABLE   0x0008
	Film Mode Detection is enabled. If enabled, driver performs inverse of various pulldowns, such as 3:2 pulldown. if this is not set then assumes FMD is disabled.
#define	VA_DEINTERLACING_SCD_ENABLE   0x0010

Video Processing Human Vision System (HVS) Denoise Mode.
#define	VA_PROC_HVS_DENOISE_DEFAULT   0x0000
	Default Mode. This mode is decided in driver to the appropriate mode.
#define	VA_PROC_HVS_DENOISE_AUTO_BDRATE   0x0001
	Auto BDRate Mode. Indicates auto BD rate improvement in pre-processing (such as before video encoding), ignore Strength.
#define	VA_PROC_HVS_DENOISE_AUTO_SUBJECTIVE   0x0002
	Auto Subjective Mode. Indicates auto subjective quality improvement in pre-processing (such as before video encoding), ignore Strength.
#define	VA_PROC_HVS_DENOISE_MANUAL   0x0003
	Manual Mode. Indicates manual mode, allow to adjust the denoise strength manually (need to set Strength explicitly).

3DLUT Channel Layout and Mapping
#define	VA_3DLUT_CHANNEL_UNKNOWN   0x00000000
	3DLUT Channel Layout is unknown.
#define	VA_3DLUT_CHANNEL_RGB_RGB   0x00000001
	3DLUT Channel Layout is R, G, B, the default layout. Map RGB to RGB.
#define	VA_3DLUT_CHANNEL_YUV_RGB   0x00000002
	3DLUT Channel Layout is Y, U, V. Map YUV to RGB.
#define	VA_3DLUT_CHANNEL_VUY_RGB   0x00000004
	3DLUT Channel Layout is V, U, Y. Map VUY to RGB.

Detailed Description

The video processing API uses the same paradigm as for decoding:

• Query for supported filters;
• Set up a video processing pipeline;
• Send video processing parameters through VA buffers.

Query for supported filters

Checking whether video processing is supported can be performed with vaQueryConfigEntrypoints() and the profile argument set to VAProfileNone. If video processing is supported, then the list of returned entry-points will include VAEntrypointVideoProc.

VAEntrypoint *entrypoints;
int i, num_entrypoints, supportsVideoProcessing = 0;
 
num_entrypoints = vaMaxNumEntrypoints();
entrypoints = malloc(num_entrypoints * sizeof(entrypoints[0]);
vaQueryConfigEntrypoints(va_dpy, VAProfileNone,
    entrypoints, &num_entrypoints);
 
for (i = 0; !supportsVideoProcessing && i < num_entrypoints; i++) {
    if (entrypoints[i] == VAEntrypointVideoProc)
        supportsVideoProcessing = 1;
}

Then, the vaQueryVideoProcFilters() function is used to query the list of video processing filters.

VAProcFilterType filters[VAProcFilterCount];
unsigned int num_filters = VAProcFilterCount;
 
// num_filters shall be initialized to the length of the array
vaQueryVideoProcFilters(va_dpy, vpp_ctx, &filters, &num_filters);

Finally, individual filter capabilities can be checked with vaQueryVideoProcFilterCaps().

VAProcFilterCap denoise_caps;
unsigned int num_denoise_caps = 1;
vaQueryVideoProcFilterCaps(va_dpy, vpp_ctx,
    VAProcFilterNoiseReduction,
    &denoise_caps, &num_denoise_caps
);
 
VAProcFilterCapDeinterlacing deinterlacing_caps[VAProcDeinterlacingCount];
unsigned int num_deinterlacing_caps = VAProcDeinterlacingCount;
vaQueryVideoProcFilterCaps(va_dpy, vpp_ctx,
    VAProcFilterDeinterlacing,
    &deinterlacing_caps, &num_deinterlacing_caps
);

Set up a video processing pipeline

A video processing pipeline buffer is created for each source surface we want to process. However, buffers holding filter parameters can be created once and for all. Rationale is to avoid multiple creation/destruction chains of filter buffers and also because filter parameters generally won't change frame after frame. e.g. this makes it possible to implement a checkerboard of videos where the same filters are applied to each video source.

The general control flow is demonstrated by the following pseudo-code:

// Create filters
VABufferID denoise_filter, deint_filter;
VABufferID filter_bufs[VAProcFilterCount];
unsigned int num_filter_bufs;
 
for (i = 0; i < num_filters; i++) {
    switch (filters[i]) {
    case VAProcFilterNoiseReduction: {       // Noise reduction filter
        VAProcFilterParameterBuffer denoise;
        denoise.type  = VAProcFilterNoiseReduction;
        denoise.value = 0.5;
        vaCreateBuffer(va_dpy, vpp_ctx,
            VAProcFilterParameterBufferType, sizeof(denoise), 1,
            &denoise, &denoise_filter
        );
        filter_bufs[num_filter_bufs++] = denoise_filter;
        break;
    }
 
    case VAProcFilterDeinterlacing:          // Motion-adaptive deinterlacing
        for (j = 0; j < num_deinterlacing_caps; j++) {
            VAProcFilterCapDeinterlacing * const cap = &deinterlacing_caps[j];
            if (cap->type != VAProcDeinterlacingMotionAdaptive)
                continue;
 
            VAProcFilterParameterBufferDeinterlacing deint;
            deint.type                   = VAProcFilterDeinterlacing;
            deint.algorithm              = VAProcDeinterlacingMotionAdaptive;
            vaCreateBuffer(va_dpy, vpp_ctx,
                VAProcFilterParameterBufferType, sizeof(deint), 1,
                &deint, &deint_filter
            );
            filter_bufs[num_filter_bufs++] = deint_filter;
        }
    }
}

Once the video processing pipeline is set up, the caller shall check the implied capabilities and requirements with vaQueryVideoProcPipelineCaps(). This function can be used to validate the number of reference frames are needed by the specified deinterlacing algorithm, the supported color primaries, etc.

// Create filters
VAProcPipelineCaps pipeline_caps;
VASurfaceID *forward_references;
unsigned int num_forward_references;
VASurfaceID *backward_references;
unsigned int num_backward_references;
VAProcColorStandardType in_color_standards[VAProcColorStandardCount];
VAProcColorStandardType out_color_standards[VAProcColorStandardCount];
 
pipeline_caps.input_color_standards      = NULL;
pipeline_caps.num_input_color_standards  = ARRAY_ELEMS(in_color_standards);
pipeline_caps.output_color_standards     = NULL;
pipeline_caps.num_output_color_standards = ARRAY_ELEMS(out_color_standards);
vaQueryVideoProcPipelineCaps(va_dpy, vpp_ctx,
    filter_bufs, num_filter_bufs,
    &pipeline_caps
);
 
num_forward_references  = pipeline_caps.num_forward_references;
forward_references      =
    malloc(num__forward_references * sizeof(VASurfaceID));
num_backward_references = pipeline_caps.num_backward_references;
backward_references     =
    malloc(num_backward_references * sizeof(VASurfaceID));

Send video processing parameters through VA buffers

Video processing pipeline parameters are submitted for each source surface to process. Video filter parameters can also change, per-surface. e.g. the list of reference frames used for deinterlacing.

foreach (iteration) {
    vaBeginPicture(va_dpy, vpp_ctx, vpp_surface);
    foreach (surface) {
        VARectangle output_region;
        VABufferID pipeline_buf;
        VAProcPipelineParameterBuffer *pipeline_param;
 
        vaCreateBuffer(va_dpy, vpp_ctx,
            VAProcPipelineParameterBuffer, sizeof(*pipeline_param), 1,
            NULL, &pipeline_buf
        );
 
        // Setup output region for this surface
        // e.g. upper left corner for the first surface
        output_region.x     = BORDER;
        output_region.y     = BORDER;
        output_region.width =
            (vpp_surface_width - (Nx_surfaces + 1) * BORDER) / Nx_surfaces;
        output_region.height =
            (vpp_surface_height - (Ny_surfaces + 1) * BORDER) / Ny_surfaces;
 
        vaMapBuffer(va_dpy, pipeline_buf, &pipeline_param);
        pipeline_param->surface              = surface;
        pipeline_param->surface_region       = NULL;
        pipeline_param->output_region        = &output_region;
        pipeline_param->output_background_color = 0;
        if (first surface to render)
            pipeline_param->output_background_color = 0xff000000; // black
        pipeline_param->filter_flags         = VA_FILTER_SCALING_HQ;
        pipeline_param->filters              = filter_bufs;
        pipeline_param->num_filters          = num_filter_bufs;
        vaUnmapBuffer(va_dpy, pipeline_buf);
 
        // Update reference frames for deinterlacing, if necessary
        pipeline_param->forward_references      = forward_references;
        pipeline_param->num_forward_references  = num_forward_references_used;
        pipeline_param->backward_references     = backward_references;
        pipeline_param->num_backward_references = num_bacward_references_used;
 
        // Apply filters
        vaRenderPicture(va_dpy, vpp_ctx, &pipeline_buf, 1);
    }
    vaEndPicture(va_dpy, vpp_ctx);
}

Macro Definition Documentation

VA_CHROMA_SITING_UNKNOWN

#define VA_CHROMA_SITING_UNKNOWN   0x00

vertical chroma sitting take bit 0-1, horizontal chroma sitting take bit 2-3 vertical chromma siting | horizontal chroma sitting to be chroma sitting

VA_PROC_PIPELINE_FAST

#define VA_PROC_PIPELINE_FAST   0x00000002

Specifies whether to apply power or performance optimizations to a pipeline.

When processing several surfaces, it may be necessary to prioritize more certain pipelines than others. This flag is only a hint to the video processor so that it can omit certain filters to save power for example. Typically, this flag could be used with video surfaces decoded from a secondary bitstream.

VA_SOURCE_RANGE_UNKNOWN

#define VA_SOURCE_RANGE_UNKNOWN   0

This is to indicate that the color-space conversion uses full range or reduced range. VA_SOURCE_RANGE_FULL(Full range): Y/Cb/Cr is in [0, 255]. It is mainly used for JPEG/JFIF formats. The combination with the BT601 flag means that JPEG/JFIF color-space conversion matrix is used. VA_SOURCE_RANGE_REDUCED(Reduced range): Y is in [16, 235] and Cb/Cr is in [16, 240]. It is mainly used for the YUV->RGB color-space conversion in SDTV/HDTV/UHDTV.

Enumeration Type Documentation

VAProcColorBalanceType

enum VAProcColorBalanceType

Color balance types.

Enumerator
VAProcColorBalanceHue	Hue.
VAProcColorBalanceSaturation	Saturation.
VAProcColorBalanceBrightness	Brightness.
VAProcColorBalanceContrast	Contrast.
VAProcColorBalanceAutoSaturation	Automatically adjusted saturation.
VAProcColorBalanceAutoBrightness	Automatically adjusted brightness.
VAProcColorBalanceAutoContrast	Automatically adjusted contrast.
VAProcColorBalanceCount	Number of color balance attributes.

VAProcColorStandardType

enum VAProcColorStandardType

Color standard types.

These define a set of color properties corresponding to particular video standards.

Where matrix_coefficients is specified, it applies only to YUV data - RGB data always use the identity matrix (matrix_coefficients = 0).

Enumerator
VAProcColorStandardBT601	ITU-R BT.601. It is unspecified whether this will use 525-line or 625-line values; specify the colour primaries and matrix coefficients explicitly if it is known which one is required. Equivalent to: colour_primaries = 5 or 6 transfer_characteristics = 6 matrix_coefficients = 5 or 6
VAProcColorStandardBT709	ITU-R BT.709. Equivalent to: colour_primaries = 1 transfer_characteristics = 1 matrix_coefficients = 1
VAProcColorStandardBT470M	ITU-R BT.470-2 System M. Equivalent to: colour_primaries = 4 transfer_characteristics = 4 matrix_coefficients = 4
VAProcColorStandardBT470BG	ITU-R BT.470-2 System B, G. Equivalent to: colour_primaries = 5 transfer_characteristics = 5 matrix_coefficients = 5
VAProcColorStandardSMPTE170M	SMPTE-170M. Equivalent to: colour_primaries = 6 transfer_characteristics = 6 matrix_coefficients = 6
VAProcColorStandardSMPTE240M	SMPTE-240M. Equivalent to: colour_primaries = 7 transfer_characteristics = 7 matrix_coefficients = 7
VAProcColorStandardGenericFilm	Generic film. Equivalent to: colour_primaries = 8 transfer_characteristics = 1 matrix_coefficients = 1
VAProcColorStandardSRGB	sRGB. Equivalent to: colour_primaries = 1 transfer_characteristics = 13 matrix_coefficients = 0
VAProcColorStandardSTRGB	stRGB. ???
VAProcColorStandardXVYCC601	xvYCC601. Equivalent to: colour_primaries = 1 transfer_characteristics = 11 matrix_coefficients = 5
VAProcColorStandardXVYCC709	xvYCC709. Equivalent to: colour_primaries = 1 transfer_characteristics = 11 matrix_coefficients = 1
VAProcColorStandardBT2020	ITU-R BT.2020. Equivalent to: colour_primaries = 9 transfer_characteristics = 14 matrix_coefficients = 9
VAProcColorStandardExplicit	Explicitly specified color properties. Use corresponding color properties section. For example, HDR10 content: colour_primaries = 9 (BT2020) transfer_characteristics = 16 (SMPTE ST2084) matrix_coefficients = 9
VAProcColorStandardCount	Number of color standards.

VAProcDeinterlacingType

enum VAProcDeinterlacingType

Deinterlacing types.

Enumerator
VAProcDeinterlacingBob	Bob deinterlacing algorithm.
VAProcDeinterlacingWeave	Weave deinterlacing algorithm.
VAProcDeinterlacingMotionAdaptive	Motion adaptive deinterlacing algorithm.
VAProcDeinterlacingMotionCompensated	Motion compensated deinterlacing algorithm.
VAProcDeinterlacingCount	Number of deinterlacing algorithms.

VAProcFilterType

enum VAProcFilterType

Video filter types.

Enumerator
VAProcFilterNoiseReduction	Noise reduction filter.
VAProcFilterDeinterlacing	Deinterlacing filter.
VAProcFilterSharpening	Sharpening filter.
VAProcFilterColorBalance	Color balance parameters.
VAProcFilterSkinToneEnhancement	Skin Tone Enhancement.
VAProcFilterTotalColorCorrection	Total Color Correction.
VAProcFilterHVSNoiseReduction	Human Vision System(HVS) Noise reduction filter.
VAProcFilterHighDynamicRangeToneMapping	High Dynamic Range Tone Mapping.
VAProcFilter3DLUT	Three-Dimensional Look Up Table (3DLUT).
VAProcFilterCount	Number of video filters.

VAProcHighDynamicRangeMetadataType

enum VAProcHighDynamicRangeMetadataType

High Dynamic Range Metadata types.

Enumerator
VAProcHighDynamicRangeMetadataHDR10	Metadata type for HDR10.
VAProcHighDynamicRangeMetadataTypeCount	Number of Metadata type.

VAProcMode

enum VAProcMode

Video Processing Mode.

Enumerator
VAProcDefaultMode	Default Mode. In this mode, pipeline is decided in driver to the appropriate mode. e.g. a mode that's a balance between power and performance.
VAProcPowerSavingMode	Power Saving Mode. In this mode, pipeline is optimized for power saving.
VAProcPerformanceMode	Performance Mode. In this mode, pipeline is optimized for performance.

VAProcTotalColorCorrectionType

enum VAProcTotalColorCorrectionType

Total color correction types.

Enumerator
VAProcTotalColorCorrectionRed	Red Saturation.
VAProcTotalColorCorrectionGreen	Green Saturation.
VAProcTotalColorCorrectionBlue	Blue Saturation.
VAProcTotalColorCorrectionCyan	Cyan Saturation.
VAProcTotalColorCorrectionMagenta	Magenta Saturation.
VAProcTotalColorCorrectionYellow	Yellow Saturation.
VAProcTotalColorCorrectionCount	Number of color correction attributes.

Function Documentation

vaQueryVideoProcFilterCaps()

VAStatus vaQueryVideoProcFilterCaps	(	VADisplay	dpy,
		VAContextID	context,
		VAProcFilterType	type,
		void *	filter_caps,
		unsigned int *	num_filter_caps
	)

Queries video filter capabilities.

This function returns the list of capabilities supported by the driver for a specific video filter. The filter_caps array is allocated by the user and num_filter_caps shall be initialized to the number of allocated elements in that array. Upon successful return, the actual number of filters will be overwritten into num_filter_caps. Otherwise, VA_STATUS_ERROR_MAX_NUM_EXCEEDED is returned and num_filter_caps is adjusted to the number of elements that would be returned if enough space was available.

Parameters

[in]	dpy	the VA display
[in]	context	the video processing context
[in]	type	the video filter type
[out]	filter_caps	the output array of VAProcFilterCap elements
[in,out]	num_filter_caps	the number of elements allocated on input, the number of elements actually filled in output

vaQueryVideoProcFilters()

VAStatus vaQueryVideoProcFilters	(	VADisplay	dpy,
		VAContextID	context,
		VAProcFilterType *	filters,
		unsigned int *	num_filters
	)

Queries video processing filters.

This function returns the list of video processing filters supported by the driver. The filters array is allocated by the user and num_filters shall be initialized to the number of allocated elements in that array. Upon successful return, the actual number of filters will be overwritten into num_filters. Otherwise, VA_STATUS_ERROR_MAX_NUM_EXCEEDED is returned and num_filters is adjusted to the number of elements that would be returned if enough space was available.

The list of video processing filters supported by the driver shall be ordered in the way they can be iteratively applied. This is needed for both correctness, i.e. some filters would not mean anything if applied at the beginning of the pipeline; but also for performance since some filters can be applied in a single pass (e.g. noise reduction + deinterlacing).

Parameters

[in]	dpy	the VA display
[in]	context	the video processing context
[out]	filters	the output array of VAProcFilterType elements
[in,out]	num_filters	the number of elements allocated on input, the number of elements actually filled in on output

vaQueryVideoProcPipelineCaps()

VAStatus vaQueryVideoProcPipelineCaps	(	VADisplay	dpy,
		VAContextID	context,
		VABufferID *	filters,
		unsigned int	num_filters,
		VAProcPipelineCaps *	pipeline_caps
	)

Queries video processing pipeline capabilities.

This function returns the video processing pipeline capabilities. The filters array defines the video processing pipeline and is an array of buffers holding filter parameters.

Note: the VAProcPipelineCaps structure contains user-provided arrays. If non-NULL, the corresponding num_* fields shall be filled in on input with the number of elements allocated. Upon successful return, the actual number of elements will be overwritten into the num_* fields. Otherwise, VA_STATUS_ERROR_MAX_NUM_EXCEEDED is returned and num_* fields are adjusted to the number of elements that would be returned if enough space was available.

Parameters

[in]	dpy	the VA display
[in]	context	the video processing context
[in]	filters	the array of VA buffers defining the video processing pipeline
[in]	num_filters	the number of elements in filters
[in,out]	pipeline_caps	the video processing pipeline capabilities