Add more complete colour properties for use in VPP

Adds colour_primaries, transfer_characteristics and matrix_coefficients
as defined by ISO/IEC 23001-8 and H.273 (and, in future, ISO/IEC 23091-2)
to the colour properties.  This allows support for HDR standards which are
not currently expressible (for example, PQ and HLG transfer functions).
These new fields are only used in VPP if the corresponding color_standard
value is set to VAColorStandardExplicit.

Also document the meaning of existing VAProcColorStandardValues in terms
of the new properties.

Signed-off-by: Mark Thompson <sw@jkqxz.net>

1 files changed, 129 insertions, 19 deletions

diff --git a/va/va_vpp.h b/va/va_vpp.h
index 4d76aad..9296c0e 100644
--- a/va/va_vpp.h
+++ b/va/va_vpp.h
@@ -289,33 +289,118 @@ typedef enum _VAProcColorBalanceType {
     VAProcColorBalanceCount
 } VAProcColorBalanceType;
 
-/** \brief Color standard types. */
+/** \brief 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).
+ */
 typedef enum _VAProcColorStandardType {
     VAProcColorStandardNone = 0,
-    /** \brief ITU-R BT.601. */
+    /** \brief 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
+     */
     VAProcColorStandardBT601,
-    /** \brief ITU-R BT.709. */
+    /** \brief ITU-R BT.709.
+     *
+     * Equivalent to:
+     *   colour_primaries = 1
+     *   transfer_characteristics = 1
+     *   matrix_coefficients = 1
+     */
     VAProcColorStandardBT709,
-    /** \brief ITU-R BT.470-2 System M. */
+    /** \brief ITU-R BT.470-2 System M.
+     *
+     * Equivalent to:
+     *   colour_primaries = 4
+     *   transfer_characteristics = 4
+     *   matrix_coefficients = 4
+     */
     VAProcColorStandardBT470M,
-    /** \brief ITU-R BT.470-2 System B, G. */
+    /** \brief ITU-R BT.470-2 System B, G.
+     *
+     * Equivalent to:
+     *   colour_primaries = 5
+     *   transfer_characteristics = 5
+     *   matrix_coefficients = 5
+     */
     VAProcColorStandardBT470BG,
-    /** \brief SMPTE-170M. */
+    /** \brief SMPTE-170M.
+     *
+     * Equivalent to:
+     *   colour_primaries = 6
+     *   transfer_characteristics = 6
+     *   matrix_coefficients = 6
+     */
     VAProcColorStandardSMPTE170M,
-    /** \brief SMPTE-240M. */
+    /** \brief SMPTE-240M.
+     *
+     * Equivalent to:
+     *   colour_primaries = 7
+     *   transfer_characteristics = 7
+     *   matrix_coefficients = 7
+     */
     VAProcColorStandardSMPTE240M,
-    /** \brief Generic film. */
+    /** \brief Generic film.
+     *
+     * Equivalent to:
+     *   colour_primaries = 8
+     *   transfer_characteristics = 1
+     *   matrix_coefficients = 1
+     */
     VAProcColorStandardGenericFilm,
-    /** \brief sRGB. */
+    /** \brief sRGB.
+     *
+     * Equivalent to:
+     *   colour_primaries = 1
+     *   transfer_characteristics = 13
+     *   matrix_coefficients = 0
+     */
     VAProcColorStandardSRGB,
-    /** \brief stRGB. */
+    /** \brief stRGB.
+     *
+     * ???
+     */
     VAProcColorStandardSTRGB,
-    /** \brief xvYCC601. */
+    /** \brief xvYCC601.
+     *
+     * Equivalent to:
+     *   colour_primaries = 1
+     *   transfer_characteristics = 11
+     *   matrix_coefficients = 5
+     */
     VAProcColorStandardXVYCC601,
-    /** \brief xvYCC709. */
+    /** \brief xvYCC709.
+     *
+     * Equivalent to:
+     *   colour_primaries = 1
+     *   transfer_characteristics = 11
+     *   matrix_coefficients = 1
+     */
     VAProcColorStandardXVYCC709,
-    /** \brief ITU-R BT.2020. */
+    /** \brief ITU-R BT.2020.
+     *
+     * Equivalent to:
+     *   colour_primaries = 9
+     *   transfer_characteristics = 14
+     *   matrix_coefficients = 9
+     */
     VAProcColorStandardBT2020,
+    /** \brief Explicitly specified color properties.
+     *
+     * Use corresponding color properties section.
+     */
+    VAProcColorStandardExplicit,
     /** \brief Number of color standards. */
     VAProcColorStandardCount
 } VAProcColorStandardType;
@@ -548,7 +633,26 @@ typedef struct _VAProcColorProperties {
     uint8_t chroma_sample_location;
     /** Chroma sample location. \c VA_SOURCE_RANGE_XXX*/
     uint8_t color_range;
-    uint8_t reserved[6];
+    /** Colour primaries.
+     *
+     * See ISO/IEC 23001-8 or ITU H.273, section 8.1 and table 2.
+     * Only used if the color standard in use is \c VAColorStandardExplicit.
+     */
+    uint8_t colour_primaries;
+    /** Transfer characteristics.
+     *
+     * See ISO/IEC 23001-8 or ITU H.273, section 8.2 and table 3.
+     * Only used if the color standard in use is \c VAColorStandardExplicit.
+     */
+    uint8_t transfer_characteristics;
+    /** Matrix coefficients.
+     *
+     * See ISO/IEC 23001-8 or ITU H.273, section 8.3 and table 4.
+     * Only used if the color standard in use is \c VAColorStandardExplicit.
+     */
+    uint8_t matrix_coefficients;
+    /** Reserved bytes for future use, must be zero. */
+    uint8_t reserved[3];
 } VAProcColorProperties;
 
 /**
@@ -597,12 +701,15 @@ typedef struct _VAProcPipelineParameterBuffer {
      */
     const VARectangle  *surface_region;
     /**
-     * \brief Requested input color primaries.
+     * \brief Requested input color standard.
      *
-     * Color primaries are implicitly converted throughout the processing
+     * Color properties are implicitly converted throughout the processing
      * pipeline. The video processor chooses the best moment to apply
-     * this conversion. The set of supported color primaries primaries
-     * for input shall be queried with vaQueryVideoProcPipelineCaps().
+     * this conversion. The set of supported color standards for input shall
+     * be queried with vaQueryVideoProcPipelineCaps().
+     *
+     * If this is set to VAProcColorStandardExplicit, the color properties
+     * are specified explicitly in surface_color_properties instead.
      */
     VAProcColorStandardType surface_color_standard;
     /**
@@ -633,7 +740,10 @@ typedef struct _VAProcPipelineParameterBuffer {
      */
     uint32_t        output_background_color;
     /**
-     * \brief Requested output color primaries.
+     * \brief Requested output color standard.
+     *
+     * If this is set to VAProcColorStandardExplicit, the color properties
+     * are specified explicitly in output_color_properties instead.
      */
     VAProcColorStandardType output_color_standard;
     /**