Class NVStreamMetadata
Application suites which make use of streams to transmit images may need to communicate additional data between the producer and consumer, synchronized with the frame updates. This data may change infrequently, such as a movie title and track number to be displayed to the user, or every frame, such as a focal length and exposure time used to process the image. Transmitting this data outside the scope of the stream may be inconvenient, particularly in the case of cross-process streams. But the nature of the data is highly application-dependent, so it is not feasible for an EGL implementation to define specific extensions for a broad range of application data.
This extension provides a means for an application (or application suite in the cross-process case) to associate arbitrary metadata with a stream. Multiple metadata fields are available, allowing them to be updated and used independently by separate subcomponents of producers and consumers, respectively. The format of the data is determined by the application, which is responsible for writing and reading it correctly.
Requires KHR_stream
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Field Summary
Modifier and TypeFieldDescriptionstatic final int
Accepted asname
byQueryStreamMetadataNV
.static final int
Accepted asattribute
byQueryDisplayAttribNV
.static final int
Accepted asattribute
byQueryDisplayAttribNV
.static final int
Accepted asattribute
byQueryDisplayAttribNV
.static final int
static final int
static final int
static final int
static final int
static final int
static final int
static final int
static final int
Accepted asname
byQueryStreamMetadataNV
.static final int
Accepted asname
byQueryStreamMetadataNV
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Method Summary
Modifier and TypeMethodDescriptionstatic boolean
eglQueryDisplayAttribNV
(long dpy, int attribute, PointerBuffer value) static boolean
eglQueryStreamMetadataNV
(long dpy, long stream, int name, int n, int offset, ByteBuffer data) static boolean
eglSetStreamMetadataNV
(long dpy, long stream, int n, int offset, ByteBuffer data) static int
neglQueryDisplayAttribNV
(long dpy, int attribute, long value) static int
neglQueryStreamMetadataNV
(long dpy, long stream, int name, int n, int offset, int size, long data) static int
neglSetStreamMetadataNV
(long dpy, long stream, int n, int offset, int size, long data)
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Field Details
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EGL_MAX_STREAM_METADATA_BLOCKS_NV
public static final int EGL_MAX_STREAM_METADATA_BLOCKS_NVAccepted asattribute
byQueryDisplayAttribNV
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EGL_MAX_STREAM_METADATA_BLOCK_SIZE_NV
public static final int EGL_MAX_STREAM_METADATA_BLOCK_SIZE_NVAccepted asattribute
byQueryDisplayAttribNV
.- See Also:
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EGL_MAX_STREAM_METADATA_TOTAL_SIZE_NV
public static final int EGL_MAX_STREAM_METADATA_TOTAL_SIZE_NVAccepted asattribute
byQueryDisplayAttribNV
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EGL_PRODUCER_METADATA_NV
public static final int EGL_PRODUCER_METADATA_NVAccepted asname
byQueryStreamMetadataNV
.- See Also:
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EGL_CONSUMER_METADATA_NV
public static final int EGL_CONSUMER_METADATA_NVAccepted asname
byQueryStreamMetadataNV
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EGL_PENDING_METADATA_NV
public static final int EGL_PENDING_METADATA_NVAccepted asname
byQueryStreamMetadataNV
.- See Also:
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EGL_METADATA0_SIZE_NV
public static final int EGL_METADATA0_SIZE_NV- See Also:
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EGL_METADATA1_SIZE_NV
public static final int EGL_METADATA1_SIZE_NV- See Also:
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EGL_METADATA2_SIZE_NV
public static final int EGL_METADATA2_SIZE_NV- See Also:
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EGL_METADATA3_SIZE_NV
public static final int EGL_METADATA3_SIZE_NV- See Also:
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EGL_METADATA0_TYPE_NV
public static final int EGL_METADATA0_TYPE_NV- See Also:
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EGL_METADATA1_TYPE_NV
public static final int EGL_METADATA1_TYPE_NV- See Also:
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EGL_METADATA2_TYPE_NV
public static final int EGL_METADATA2_TYPE_NV- See Also:
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EGL_METADATA3_TYPE_NV
public static final int EGL_METADATA3_TYPE_NV- See Also:
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Method Details
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neglQueryDisplayAttribNV
public static int neglQueryDisplayAttribNV(long dpy, int attribute, long value) -
eglQueryDisplayAttribNV
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neglSetStreamMetadataNV
public static int neglSetStreamMetadataNV(long dpy, long stream, int n, int offset, int size, long data) -
eglSetStreamMetadataNV
public static boolean eglSetStreamMetadataNV(long dpy, long stream, int n, int offset, ByteBuffer data) -
neglQueryStreamMetadataNV
public static int neglQueryStreamMetadataNV(long dpy, long stream, int name, int n, int offset, int size, long data) -
eglQueryStreamMetadataNV
public static boolean eglQueryStreamMetadataNV(long dpy, long stream, int name, int n, int offset, ByteBuffer data)
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