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27 * \brief The video processing API
29 * This file contains the \ref api_vpp "Video processing API".
40 * \defgroup api_vpp Video processing API
44 * The video processing API uses the same paradigm as for decoding:
45 * - Query for supported filters;
46 * - Set up a video processing pipeline;
47 * - Send video processing parameters through VA buffers.
49 * \section api_vpp_caps Query for supported filters
51 * Checking whether video processing is supported can be performed
52 * with vaQueryConfigEntrypoints() and the profile argument set to
53 * #VAProfileNone. If video processing is supported, then the list of
54 * returned entry-points will include #VAEntrypointVideoProc.
57 * VAEntrypoint *entrypoints;
58 * int i, num_entrypoints, supportsVideoProcessing = 0;
60 * num_entrypoints = vaMaxNumEntrypoints();
61 * entrypoints = malloc(num_entrypoints * sizeof(entrypoints[0]);
62 * vaQueryConfigEntrypoints(va_dpy, VAProfileNone,
63 * entrypoints, &num_entrypoints);
65 * for (i = 0; !supportsVideoProcessing && i < num_entrypoints; i++) {
66 * if (entrypoints[i] == VAEntrypointVideoProc)
67 * supportsVideoProcessing = 1;
71 * Then, the vaQueryVideoProcFilters() function is used to query the
72 * list of video processing filters.
75 * VAProcFilterType filters[VAProcFilterCount];
76 * unsigned int num_filters = VAProcFilterCount;
78 * // num_filters shall be initialized to the length of the array
79 * vaQueryVideoProcFilters(va_dpy, vpp_ctx, &pipe_caps, &num_filters);
82 * Finally, individual filter capabilities can be checked with
83 * vaQueryVideoProcFilterCaps().
86 * VAProcFilterCap denoise_caps;
87 * unsigned int num_denoise_caps = 1;
88 * vaQueryVideoProcFilterCaps(va_dpy, vpp_ctx,
89 * VAProcFilterNoiseReduction,
90 * &denoise_caps, &num_denoise_caps
93 * VAProcFilterCapDeinterlacing deinterlacing_caps[VAProcDeinterlacingCount];
94 * unsigned int num_deinterlacing_caps = VAProcDeinterlacingCount;
95 * vaQueryVideoProcFilterCaps(va_dpy, vpp_ctx,
96 * VAProcFilterDeinterlacing,
97 * &deinterlacing_caps, &num_deinterlacing_caps
101 * \section api_vpp_setup Set up a video processing pipeline
103 * A video processing pipeline buffer is created for each source
104 * surface we want to process. However, buffers holding filter
105 * parameters can be created once and for all. Rationale is to avoid
106 * multiple creation/destruction chains of filter buffers and also
107 * because filter parameters generally won't change frame after
108 * frame. e.g. this makes it possible to implement a checkerboard of
109 * videos where the same filters are applied to each video source.
111 * The general control flow is demonstrated by the following pseudo-code:
114 * VABufferID denoise_filter, deint_filter;
115 * VABufferID filter_bufs[VAProcFilterCount];
116 * unsigned int num_filter_bufs;
118 * for (i = 0; i < num_filters; i++) {
119 * switch (filters[i]) {
120 * case VAProcFilterNoiseReduction: { // Noise reduction filter
121 * VAProcFilterParameterBuffer denoise;
122 * denoise.type = VAProcFilterNoiseReduction;
123 * denoise.value = 0.5;
124 * vaCreateBuffer(va_dpy, vpp_ctx,
125 * VAProcFilterParameterBufferType, sizeof(denoise), 1,
126 * &denoise, &denoise_filter
128 * filter_bufs[num_filter_bufs++] = denoise_filter;
132 * case VAProcFilterDeinterlacing: // Motion-adaptive deinterlacing
133 * for (j = 0; j < num_deinterlacing_caps; j++) {
134 * VAProcFilterCapDeinterlacing * const cap = &deinterlacing_caps[j];
135 * if (cap->type != VAProcDeinterlacingMotionAdaptive)
138 * VAProcFilterParameterBufferDeinterlacing deint;
139 * deint.type = VAProcFilterDeinterlacing;
140 * deint.algorithm = VAProcDeinterlacingMotionAdaptive;
141 * vaCreateBuffer(va_dpy, vpp_ctx,
142 * VAProcFilterParameterBufferType, sizeof(deint), 1,
143 * &deint, &deint_filter
145 * filter_bufs[num_filter_bufs++] = deint_filter;
151 * Once the video processing pipeline is set up, the caller shall check the
152 * implied capabilities and requirements with vaQueryVideoProcPipelineCaps().
153 * This function can be used to validate the number of reference frames are
154 * needed by the specified deinterlacing algorithm, the supported color
158 * VAProcPipelineCaps pipeline_caps;
159 * VASurfaceID *forward_references;
160 * unsigned int num_forward_references;
161 * VASurfaceID *backward_references;
162 * unsigned int num_backward_references;
163 * VAProcColorStandardType in_color_standards[VAProcColorStandardCount];
164 * VAProcColorStandardType out_color_standards[VAProcColorStandardCount];
166 * pipeline_caps.input_color_standards = NULL;
167 * pipeline_caps.num_input_color_standards = ARRAY_ELEMS(in_color_standards);
168 * pipeline_caps.output_color_standards = NULL;
169 * pipeline_caps.num_output_color_standards = ARRAY_ELEMS(out_color_standards);
170 * vaQueryVideoProcPipelineCaps(va_dpy, vpp_ctx,
171 * filter_bufs, num_filter_bufs,
175 * num_forward_references = pipeline_caps.num_forward_references;
176 * forward_references =
177 * malloc(num__forward_references * sizeof(VASurfaceID));
178 * num_backward_references = pipeline_caps.num_backward_references;
179 * backward_references =
180 * malloc(num_backward_references * sizeof(VASurfaceID));
183 * \section api_vpp_submit Send video processing parameters through VA buffers
185 * Video processing pipeline parameters are submitted for each source
186 * surface to process. Video filter parameters can also change, per-surface.
187 * e.g. the list of reference frames used for deinterlacing.
190 * foreach (iteration) {
191 * vaBeginPicture(va_dpy, vpp_ctx, vpp_surface);
192 * foreach (surface) {
193 * VARectangle output_region;
194 * VABufferID pipeline_buf;
195 * VAProcPipelineParameterBuffer *pipeline_param;
197 * vaCreateBuffer(va_dpy, vpp_ctx,
198 * VAProcPipelineParameterBuffer, sizeof(*pipeline_param), 1,
199 * NULL, &pipeline_param
202 * // Setup output region for this surface
203 * // e.g. upper left corner for the first surface
204 * output_region.x = BORDER;
205 * output_region.y = BORDER;
206 * output_region.width =
207 * (vpp_surface_width - (Nx_surfaces + 1) * BORDER) / Nx_surfaces;
208 * output_region.height =
209 * (vpp_surface_height - (Ny_surfaces + 1) * BORDER) / Ny_surfaces;
211 * vaMapBuffer(va_dpy, pipeline_buf, &pipeline_param);
212 * pipeline_param->surface = surface;
213 * pipeline_param->surface_region = NULL;
214 * pipeline_param->output_region = &output_region;
215 * pipeline_param->output_background_color = 0;
216 * if (first surface to render)
217 * pipeline_param->output_background_color = 0xff000000; // black
218 * pipeline_param->filter_flags = VA_FILTER_SCALING_HQ;
219 * pipeline_param->filters = filter_bufs;
220 * pipeline_param->num_filters = num_filter_bufs;
221 * vaUnmapBuffer(va_dpy, pipeline_buf);
223 * // Update reference frames for deinterlacing, if necessary
224 * pipeline_param->forward_references = forward_references;
225 * pipeline_param->num_forward_references = num_forward_references_used;
226 * pipeline_param->backward_references = backward_references;
227 * pipeline_param->num_backward_references = num_bacward_references_used;
230 * vaRenderPicture(va_dpy, vpp_ctx, &pipeline_buf, 1);
232 * vaEndPicture(va_dpy, vpp_ctx);
237 /** \brief Video filter types. */
238 typedef enum _VAProcFilterType {
239 VAProcFilterNone = 0,
240 /** \brief Noise reduction filter. */
241 VAProcFilterNoiseReduction,
242 /** \brief Deinterlacing filter. */
243 VAProcFilterDeinterlacing,
244 /** \brief Sharpening filter. */
245 VAProcFilterSharpening,
246 /** \brief Color balance parameters. */
247 VAProcFilterColorBalance,
248 /** \brief Color standard conversion. */
249 VAProcFilterColorStandard,
250 /** \brief Number of video filters. */
254 /** \brief Deinterlacing types. */
255 typedef enum _VAProcDeinterlacingType {
256 VAProcDeinterlacingNone = 0,
257 /** \brief Bob deinterlacing algorithm. */
258 VAProcDeinterlacingBob,
259 /** \brief Weave deinterlacing algorithm. */
260 VAProcDeinterlacingWeave,
261 /** \brief Motion adaptive deinterlacing algorithm. */
262 VAProcDeinterlacingMotionAdaptive,
263 /** \brief Motion compensated deinterlacing algorithm. */
264 VAProcDeinterlacingMotionCompensated,
265 /** \brief Number of deinterlacing algorithms. */
266 VAProcDeinterlacingCount
267 } VAProcDeinterlacingType;
269 /** \brief Color balance types. */
270 typedef enum _VAProcColorBalanceType {
271 VAProcColorBalanceNone = 0,
273 VAProcColorBalanceHue,
274 /** \brief Saturation. */
275 VAProcColorBalanceSaturation,
276 /** \brief Brightness. */
277 VAProcColorBalanceBrightness,
278 /** \brief Contrast. */
279 VAProcColorBalanceContrast,
280 /** \brief Automatically adjusted saturation. */
281 VAProcColorBalanceAutoSaturation,
282 /** \brief Automatically adjusted brightness. */
283 VAProcColorBalanceAutoBrightness,
284 /** \brief Automatically adjusted contrast. */
285 VAProcColorBalanceAutoContrast,
286 /** \brief Number of color balance attributes. */
287 VAProcColorBalanceCount
288 } VAProcColorBalanceType;
290 /** \brief Color standard types. */
291 typedef enum _VAProcColorStandardType {
292 VAProcColorStandardNone = 0,
293 /** \brief ITU-R BT.601. */
294 VAProcColorStandardBT601,
295 /** \brief ITU-R BT.709. */
296 VAProcColorStandardBT709,
297 /** \brief ITU-R BT.470-2 System M. */
298 VAProcColorStandardBT470M,
299 /** \brief ITU-R BT.470-2 System B, G. */
300 VAProcColorStandardBT470BG,
301 /** \brief SMPTE-170M. */
302 VAProcColorStandardSMPTE170M,
303 /** \brief SMPTE-240M. */
304 VAProcColorStandardSMPTE240M,
305 /** \brief Generic film. */
306 VAProcColorStandardGenericFilm,
307 /** \brief Number of color standards. */
308 VAProcColorStandardCount
309 } VAProcColorStandardType;
311 /** @name Video pipeline flags */
313 /** \brief Specifies whether to apply subpictures when processing a surface. */
314 #define VA_PROC_PIPELINE_SUBPICTURES 0x00000001
316 * \brief Specifies whether to apply power or performance
317 * optimizations to a pipeline.
319 * When processing several surfaces, it may be necessary to prioritize
320 * more certain pipelines than others. This flag is only a hint to the
321 * video processor so that it can omit certain filters to save power
322 * for example. Typically, this flag could be used with video surfaces
323 * decoded from a secondary bitstream.
325 #define VA_PROC_PIPELINE_FAST 0x00000002
328 /** @name Video filter flags */
330 /** \brief Specifies whether the filter shall be present in the pipeline. */
331 #define VA_PROC_FILTER_MANDATORY 0x00000001
334 /** \brief Video processing pipeline capabilities. */
335 typedef struct _VAProcPipelineCaps {
336 /** \brief Video filter flags. See video pipeline flags. */
338 /** \brief Pipeline flags. See VAProcPipelineParameterBuffer::pipeline_flags. */
339 unsigned int pipeline_flags;
340 /** \brief Extra filter flags. See VAProcPipelineParameterBuffer::filter_flags. */
341 unsigned int filter_flags;
342 /** \brief Number of forward reference frames that are needed. */
343 unsigned int num_forward_references;
344 /** \brief Number of backward reference frames that are needed. */
345 unsigned int num_backward_references;
346 /** \brief List of color standards supported on input. */
347 VAProcColorStandardType *input_color_standards;
348 /** \brief Number of elements in \ref input_color_standards array. */
349 unsigned int num_input_color_standards;
350 /** \brief List of color standards supported on output. */
351 VAProcColorStandardType *output_color_standards;
352 /** \brief Number of elements in \ref output_color_standards array. */
353 unsigned int num_output_color_standards;
354 } VAProcPipelineCaps;
356 /** \brief Specification of values supported by the filter. */
357 typedef struct _VAProcFilterValueRange {
358 /** \brief Minimum value supported, inclusive. */
360 /** \brief Maximum value supported, inclusive. */
362 /** \brief Default value. */
364 /** \brief Step value that alters the filter behaviour in a sensible way. */
366 } VAProcFilterValueRange;
369 * \brief Video processing pipeline configuration.
371 * This buffer defines a video processing pipeline. As for any buffer
372 * passed to \c vaRenderPicture(), this is a one-time usage model.
373 * However, the actual filters to be applied are provided in the
374 * \c filters field, so they can be re-used in other processing
377 * The target surface is specified by the \c render_target argument of
378 * \c vaBeginPicture(). The general usage model is described as follows:
379 * - \c vaBeginPicture(): specify the target surface that receives the
381 * - \c vaRenderPicture(): specify a surface to be processed and composed
382 * into the \c render_target. Use as many \c vaRenderPicture() calls as
383 * necessary surfaces to compose ;
384 * - \c vaEndPicture(): tell the driver to start processing the surfaces
385 * with the requested filters.
387 * If a filter (e.g. noise reduction) needs to be applied with different
388 * values for multiple surfaces, the application needs to create as many
389 * filter parameter buffers as necessary. i.e. the filter parameters shall
390 * not change between two calls to \c vaRenderPicture().
392 * For composition usage models, the first surface to process will generally
393 * use an opaque background color, i.e. \c output_background_color set with
394 * the most significant byte set to \c 0xff. For instance, \c 0xff000000 for
395 * a black background. Then, subsequent surfaces would use a transparent
398 typedef struct _VAProcPipelineParameterBuffer {
400 * \brief Source surface ID.
402 * ID of the source surface to process. If subpictures are associated
403 * with the video surfaces then they shall be rendered to the target
404 * surface, if the #VA_PROC_PIPELINE_SUBPICTURES pipeline flag is set.
408 * \brief Region within the source surface to be processed.
410 * Pointer to a #VARectangle defining the region within the source
411 * surface to be processed. If NULL, \c surface_region implies the
414 const VARectangle *surface_region;
416 * \brief Requested input color primaries.
418 * Color primaries are implicitly converted throughout the processing
419 * pipeline. The video processor chooses the best moment to apply
420 * this conversion. The set of supported color primaries primaries
421 * for input shall be queried with vaQueryVideoProcPipelineCaps().
423 VAProcColorStandardType surface_color_standard;
425 * \brief Region within the output surface.
427 * Pointer to a #VARectangle defining the region within the output
428 * surface that receives the processed pixels. If NULL, \c output_region
429 * implies the whole surface.
431 * Note that any pixels residing outside the specified region will
432 * be filled in with the \ref output_background_color.
434 const VARectangle *output_region;
436 * \brief Background color.
438 * Background color used to fill in pixels that reside outside of the
439 * specified \ref output_region. The color is specified in ARGB format:
440 * [31:24] alpha, [23:16] red, [15:8] green, [7:0] blue.
442 * Unless the alpha value is zero or the \ref output_region represents
443 * the whole target surface size, implementations shall not render the
444 * source surface to the target surface directly. Rather, in order to
445 * maintain the exact semantics of \ref output_background_color, the
446 * driver shall use a temporary surface and fill it in with the
447 * appropriate background color. Next, the driver will blend this
448 * temporary surface into the target surface.
450 unsigned int output_background_color;
452 * \brief Requested output color primaries.
454 VAProcColorStandardType output_color_standard;
456 * \brief Pipeline filters. See video pipeline flags.
458 * Flags to control the pipeline, like whether to apply subpictures
459 * or not, notify the driver that it can opt for power optimizations,
460 * should this be needed.
462 unsigned int pipeline_flags;
464 * \brief Extra filter flags. See vaPutSurface() flags.
466 * Filter flags are used as a fast path, wherever possible, to use
467 * vaPutSurface() flags instead of explicit filter parameter buffers.
469 * Allowed filter flags API-wise. Use vaQueryVideoProcPipelineCaps()
470 * to check for implementation details:
471 * - Bob-deinterlacing: \c VA_FRAME_PICTURE, \c VA_TOP_FIELD,
472 * \c VA_BOTTOM_FIELD. Note that any deinterlacing filter
473 * (#VAProcFilterDeinterlacing) will override those flags.
474 * - Color space conversion: \c VA_SRC_BT601, \c VA_SRC_BT709,
475 * \c VA_SRC_SMPTE_240. Note that any color standard filter
476 * (#VAProcFilterColorStandard) will override those flags.
477 * - Scaling: \c VA_FILTER_SCALING_DEFAULT, \c VA_FILTER_SCALING_FAST,
478 * \c VA_FILTER_SCALING_HQ, \c VA_FILTER_SCALING_NL_ANAMORPHIC.
480 unsigned int filter_flags;
482 * \brief Array of filters to apply to the surface.
484 * The list of filters shall be ordered in the same way the driver expects
485 * them. i.e. as was returned from vaQueryVideoProcFilters().
486 * Otherwise, a #VA_STATUS_ERROR_INVALID_FILTER_CHAIN is returned
487 * from vaRenderPicture() with this buffer.
489 * #VA_STATUS_ERROR_UNSUPPORTED_FILTER is returned if the list
490 * contains an unsupported filter.
492 * Note: no filter buffer is destroyed after a call to vaRenderPicture(),
493 * only this pipeline buffer will be destroyed as per the core API
494 * specification. This allows for flexibility in re-using the filter for
495 * other surfaces to be processed.
498 /** \brief Actual number of filters. */
499 unsigned int num_filters;
500 /** \brief Array of forward reference frames. */
501 VASurfaceID *forward_references;
502 /** \brief Number of forward reference frames that were supplied. */
503 unsigned int num_forward_references;
504 /** \brief Array of backward reference frames. */
505 VASurfaceID *backward_references;
506 /** \brief Number of backward reference frames that were supplied. */
507 unsigned int num_backward_references;
508 } VAProcPipelineParameterBuffer;
511 * \brief Filter parameter buffer base.
513 * This is a helper structure used by driver implementations only.
514 * Users are not supposed to allocate filter parameter buffers of this
517 typedef struct _VAProcFilterParameterBufferBase {
518 /** \brief Filter type. */
519 VAProcFilterType type;
520 } VAProcFilterParameterBufferBase;
523 * \brief Default filter parametrization.
525 * Unless there is a filter-specific parameter buffer,
526 * #VAProcFilterParameterBuffer is the default type to use.
528 typedef struct _VAProcFilterParameterBuffer {
529 /** \brief Filter type. */
530 VAProcFilterType type;
533 } VAProcFilterParameterBuffer;
535 /** \brief Deinterlacing filter parametrization. */
536 typedef struct _VAProcFilterParameterBufferDeinterlacing {
537 /** \brief Filter type. Shall be set to #VAProcFilterDeinterlacing. */
538 VAProcFilterType type;
539 /** \brief Deinterlacing algorithm. */
540 VAProcDeinterlacingType algorithm;
541 } VAProcFilterParameterBufferDeinterlacing;
544 * \brief Color balance filter parametrization.
546 * This buffer defines color balance attributes. A VA buffer can hold
547 * several color balance attributes by creating a VA buffer of desired
548 * number of elements. This can be achieved by the following pseudo-code:
551 * enum { kHue, kSaturation, kBrightness, kContrast };
553 * // Initial color balance parameters
554 * static const VAProcFilterParameterBufferColorBalance colorBalanceParams[4] =
557 * { VAProcFilterColorBalance, VAProcColorBalanceHue, 0.5 },
559 * { VAProcFilterColorBalance, VAProcColorBalanceSaturation, 0.5 },
561 * { VAProcFilterColorBalance, VAProcColorBalanceBrightness, 0.5 },
563 * { VAProcFilterColorBalance, VAProcColorBalanceSaturation, 0.5 }
567 * VABufferID colorBalanceBuffer;
568 * vaCreateBuffer(va_dpy, vpp_ctx,
569 * VAProcFilterParameterBufferType, sizeof(*pColorBalanceParam), 4,
570 * colorBalanceParams,
571 * &colorBalanceBuffer
574 * VAProcFilterParameterBufferColorBalance *pColorBalanceParam;
575 * vaMapBuffer(va_dpy, colorBalanceBuffer, &pColorBalanceParam);
577 * // Change brightness only
578 * pColorBalanceBuffer[kBrightness].value = 0.75;
580 * vaUnmapBuffer(va_dpy, colorBalanceBuffer);
583 typedef struct _VAProcFilterParameterBufferColorBalance {
584 /** \brief Filter type. Shall be set to #VAProcFilterColorBalance. */
585 VAProcFilterType type;
586 /** \brief Color balance attribute. */
587 VAProcColorBalanceType attrib;
589 * \brief Color balance value.
591 * Special case for automatically adjusted attributes. e.g.
592 * #VAProcColorBalanceAutoSaturation,
593 * #VAProcColorBalanceAutoBrightness,
594 * #VAProcColorBalanceAutoContrast.
595 * - If \ref value is \c 1.0 +/- \c FLT_EPSILON, the attribute is
596 * automatically adjusted and overrides any other attribute of
597 * the same type that would have been set explicitly;
598 * - If \ref value is \c 0.0 +/- \c FLT_EPSILON, the attribute is
599 * disabled and other attribute of the same type is used instead.
602 } VAProcFilterParameterBufferColorBalance;
604 /** \brief Color standard filter parametrization. */
605 typedef struct _VAProcFilterParameterBufferColorStandard {
606 /** \brief Filter type. Shall be set to #VAProcFilterColorStandard. */
607 VAProcFilterType type;
608 /** \brief Color standard to use. */
609 VAProcColorStandardType standard;
610 } VAProcFilterParameterBufferColorStandard;
613 * \brief Default filter cap specification (single range value).
615 * Unless there is a filter-specific cap structure, #VAProcFilterCap is the
616 * default type to use for output caps from vaQueryVideoProcFilterCaps().
618 typedef struct _VAProcFilterCap {
619 /** \brief Range of supported values for the filter. */
620 VAProcFilterValueRange range;
623 /** \brief Capabilities specification for the deinterlacing filter. */
624 typedef struct _VAProcFilterCapDeinterlacing {
625 /** \brief Deinterlacing algorithm. */
626 VAProcDeinterlacingType type;
627 } VAProcFilterCapDeinterlacing;
629 /** \brief Capabilities specification for the color balance filter. */
630 typedef struct _VAProcFilterCapColorBalance {
631 /** \brief Color balance operation. */
632 VAProcColorBalanceType type;
633 /** \brief Range of supported values for the specified operation. */
634 VAProcFilterValueRange range;
635 } VAProcFilterCapColorBalance;
637 /** \brief Capabilities specification for the color standard filter. */
638 typedef struct _VAProcFilterCapColorStandard {
639 /** \brief Color standard type. */
640 VAProcColorStandardType type;
641 } VAProcFilterCapColorStandard;
644 * \brief Queries video processing filters.
646 * This function returns the list of video processing filters supported
647 * by the driver. The \c filters array is allocated by the user and
648 * \c num_filters shall be initialized to the number of allocated
649 * elements in that array. Upon successful return, the actual number
650 * of filters will be overwritten into \c num_filters. Otherwise,
651 * \c VA_STATUS_ERROR_MAX_NUM_EXCEEDED is returned and \c num_filters
652 * is adjusted to the number of elements that would be returned if enough
653 * space was available.
655 * The list of video processing filters supported by the driver shall
656 * be ordered in the way they can be iteratively applied. This is needed
657 * for both correctness, i.e. some filters would not mean anything if
658 * applied at the beginning of the pipeline; but also for performance
659 * since some filters can be applied in a single pass (e.g. noise
660 * reduction + deinterlacing).
662 * @param[in] dpy the VA display
663 * @param[in] context the video processing context
664 * @param[out] filters the output array of #VAProcFilterType elements
665 * @param[in,out] num_filters the number of elements allocated on input,
666 * the number of elements actually filled in on output
669 vaQueryVideoProcFilters(
672 VAProcFilterType *filters,
673 unsigned int *num_filters
677 * \brief Queries video filter capabilities.
679 * This function returns the list of capabilities supported by the driver
680 * for a specific video filter. The \c filter_caps array is allocated by
681 * the user and \c num_filter_caps shall be initialized to the number
682 * of allocated elements in that array. Upon successful return, the
683 * actual number of filters will be overwritten into \c num_filter_caps.
684 * Otherwise, \c VA_STATUS_ERROR_MAX_NUM_EXCEEDED is returned and
685 * \c num_filter_caps is adjusted to the number of elements that would be
686 * returned if enough space was available.
688 * @param[in] dpy the VA display
689 * @param[in] context the video processing context
690 * @param[in] type the video filter type
691 * @param[out] filter_caps the output array of #VAProcFilterCap elements
692 * @param[in,out] num_filter_caps the number of elements allocated on input,
693 * the number of elements actually filled in output
696 vaQueryVideoProcFilterCaps(
699 VAProcFilterType type,
701 unsigned int *num_filter_caps
705 * \brief Queries video processing pipeline capabilities.
707 * This function returns the video processing pipeline capabilities. The
708 * \c filters array defines the video processing pipeline and is an array
709 * of buffers holding filter parameters.
711 * Note: the #VAProcPipelineCaps structure contains user-provided arrays.
712 * If non-NULL, the corresponding \c num_* fields shall be filled in on
713 * input with the number of elements allocated. Upon successful return,
714 * the actual number of elements will be overwritten into the \c num_*
715 * fields. Otherwise, \c VA_STATUS_ERROR_MAX_NUM_EXCEEDED is returned
716 * and \c num_* fields are adjusted to the number of elements that would
717 * be returned if enough space was available.
719 * @param[in] dpy the VA display
720 * @param[in] context the video processing context
721 * @param[in] filters the array of VA buffers defining the video
722 * processing pipeline
723 * @param[in] num_filters the number of elements in filters
724 * @param[in,out] pipeline_caps the video processing pipeline capabilities
727 vaQueryVideoProcPipelineCaps(
731 unsigned int num_filters,
732 VAProcPipelineCaps *pipeline_caps
741 #endif /* VA_VPP_H */