media: rework DescribeColorAspectsParams

// 'OMX.google.android.index.describeColorAspects' extension is given.

//

// Video encoders: the framework uses OMX_SetConfig to specify color aspects

// of the coded video before the component transitions to idle state.

// of the coded video before the component transitions to idle state, as well

// as before an input frame with a different color aspect is sent:

// 1. The component should maintain an internal color aspect state, initialized

//   to Unspecified values.

// 2. Upon OMX_SetConfig, it SHOULD update its internal state for the aspects that are not

//   Unspecified in the config param.

// 3. If an aspect value cannot be encoded into the bitstream (including the Other value), that

//   aspect should be reset to the Unspecified value (in the internal state).

// 4. OMX_GetConfig SHOULD return the current internal state.

// 5. If changing the color aspects after the first input frame is not supported, and the config

//   params would actually cause a change, OMX_SetConfig should fail with the internal state

//   unchanged.

// 6. If changing a portion of the aspects after the first input frame is supported, OMX_SetConfig

//   should succeed with the portion of the internal state updated.

//

// Video decoders: the framework uses OMX_SetConfig to specify color aspects

// of the coded video parsed from the container before the component transitions

// to idle state. If the bitstream contains color information, the component should

// update the appropriate color aspects - unless the bitstream contains the

// "unspecified" value. For "reserved" values, the component should set the aspect

// to "Other".

//

// The framework subsequently uses OMX_GetConfig to get any updates of the

// color aspects from the decoder. If the color aspects change at any time

// during the processing of the stream, the component shall signal a

// OMX_EventPortSettingsChanged event with data2 set to the extension index

// (or OMX_IndexConfigCommonOutputCrop, as it is handled identically). Component

// shall not signal a separate event purely for color aspect change, if it occurs

// to idle state.

// 1. The component should maintiain an internal color aspect state, initialized to Unspecified

//   values.

// 2. Upon OMX_SetConfig, it SHOULD update its internal state for the aspects that are not

//   Unspecified in the config param, regardless of whether such aspects could be supplied by the

//   component bitstream. (E.g. it should blindly support all enumeration values, even unknown

//   ones, and the Other value).

// 3. OMX_GetConfig SHOULD return the current internal state.

// 4. When the component processes color aspect information in the bitstream with a non-Unspecified

//   value, it should update its internal state with that information just before the frame

//   with the new information is outputted, and the component SHALL signal an

//   OMX_EventPortSettingsChanged event with data2 set to the extension index (or

//   OMX_IndexConfigCommonOutputCrop, as it is handled identically).

// 4a. Component shall not signal a separate event purely for color aspect change, if it occurs

//   together with a port definition (e.g. size) or crop change.

// 5. If the aspects a component encounters in the bitstream cannot be represented with the below

//   enumeration values, it should set those aspects to Other. Restricted values in the bitstream

//   should be treated as defined by the relevant bitstream specifications/standards, or as

//   Unspecified, if not defined.

//

// NOTE: this structure is expected to grow in the future if new color aspects are

// added to codec bitstreams. OMX component should not require a specific nSize

// time of implementation. All new fields will be added at the end of the structure

// ensuring backward compatibility.

struct DescribeColorAspectsParams {

    OMX_U32 nSize;              // IN

    OMX_VERSIONTYPE nVersion;   // IN

    OMX_U32 nPortIndex;         // IN

    OMX_U32 nRange;             // IN/OUT (one of the ColorAspects.Range enums)

    OMX_U32 nPrimaries;         // IN/OUT (one of the ColorAspects.Primaries enums)

    OMX_U32 nTransfer;          // IN/OUT (one of the ColorAspects.Transfer enums)

    OMX_U32 nMatrixCoeffs;      // IN/OUT (one of the ColorAspects.MatrixCoeffs enums)

};

struct ColorAspects {

    // this is in sync with the range values in graphics.h

    enum Range : uint32_t {

        StandardFilm,                   // PrimariesGenericFilm and KR=0.253, KB=0.068

        StandardOther = 0xff,

    };

    Range mRange;                // IN/OUT

    Primaries mPrimaries;        // IN/OUT

    Transfer mTransfer;          // IN/OUT

    MatrixCoeffs mMatrixCoeffs;  // IN/OUT

};

struct DescribeColorAspectsParams {

    OMX_U32 nSize;              // IN

    OMX_VERSIONTYPE nVersion;   // IN

    OMX_U32 nPortIndex;         // IN

    ColorAspects sAspects;      // IN/OUT

};

}  // namespace android