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hwcontext: Hardware frame mapping

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Adds the new av_hwframe_map() function, which allows mapping between
hardware frames and normal memory, along with internal support for
implementing it.

Also adds av_hwframe_ctx_create_derived(), for creating a hardware
frames context associated with one device using frames mapped from
another by some hardware-specific means.
This commit is contained in:
Mark Thompson
2016-10-25 20:38:47 +01:00
parent 67351924fa
commit d06aa24ba5
5 changed files with 365 additions and 7 deletions
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40
libavutil/hwcontext_internal.h
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@@ -85,6 +85,11 @@ typedef struct HWContextType {
const AVFrame *src);
int (*transfer_data_from)(AVHWFramesContext *ctx, AVFrame *dst,
const AVFrame *src);
int (*map_to)(AVHWFramesContext *ctx, AVFrame *dst,
const AVFrame *src, int flags);
int (*map_from)(AVHWFramesContext *ctx, AVFrame *dst,
const AVFrame *src, int flags);
} HWContextType;
struct AVHWDeviceInternal {
@@ -97,8 +102,43 @@ struct AVHWFramesInternal {
void *priv;
AVBufferPool *pool_internal;
/**
* For a derived context, a reference to the original frames
* context it was derived from.
*/
AVBufferRef *source_frames;
};
typedef struct HWMapDescriptor {
/**
* A reference to the original source of the mapping.
*/
AVFrame *source;
/**
* A reference to the hardware frames context in which this
* mapping was made. May be the same as source->hw_frames_ctx,
* but need not be.
*/
AVBufferRef *hw_frames_ctx;
/**
* Unmap function.
*/
void (*unmap)(AVHWFramesContext *ctx,
struct HWMapDescriptor *hwmap);
/**
* Hardware-specific private data associated with the mapping.
*/
void *priv;
} HWMapDescriptor;
int ff_hwframe_map_create(AVBufferRef *hwframe_ref,
AVFrame *dst, const AVFrame *src,
void (*unmap)(AVHWFramesContext *ctx,
HWMapDescriptor *hwmap),
void *priv);
extern const HWContextType ff_hwcontext_type_cuda;
extern const HWContextType ff_hwcontext_type_dxva2;
extern const HWContextType ff_hwcontext_type_qsv;