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+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVUTIL_HWCONTEXT_H
+#define AVUTIL_HWCONTEXT_H
+
+#include "buffer.h"
+#include "frame.h"
+#include "log.h"
+#include "pixfmt.h"
+
+enum AVHWDeviceType {
+ AV_HWDEVICE_TYPE_NONE,
+ AV_HWDEVICE_TYPE_VDPAU,
+ AV_HWDEVICE_TYPE_CUDA,
+ AV_HWDEVICE_TYPE_VAAPI,
+ AV_HWDEVICE_TYPE_DXVA2,
+ AV_HWDEVICE_TYPE_QSV,
+ AV_HWDEVICE_TYPE_VIDEOTOOLBOX,
+ AV_HWDEVICE_TYPE_D3D11VA,
+ AV_HWDEVICE_TYPE_DRM,
+ AV_HWDEVICE_TYPE_OPENCL,
+ AV_HWDEVICE_TYPE_MEDIACODEC,
+ AV_HWDEVICE_TYPE_VULKAN,
+};
+
+typedef struct AVHWDeviceInternal AVHWDeviceInternal;
+
+/**
+ * This struct aggregates all the (hardware/vendor-specific) "high-level" state,
+ * i.e. state that is not tied to a concrete processing configuration.
+ * E.g., in an API that supports hardware-accelerated encoding and decoding,
+ * this struct will (if possible) wrap the state that is common to both encoding
+ * and decoding and from which specific instances of encoders or decoders can be
+ * derived.
+ *
+ * This struct is reference-counted with the AVBuffer mechanism. The
+ * av_hwdevice_ctx_alloc() constructor yields a reference, whose data field
+ * points to the actual AVHWDeviceContext. Further objects derived from
+ * AVHWDeviceContext (such as AVHWFramesContext, describing a frame pool with
+ * specific properties) will hold an internal reference to it. After all the
+ * references are released, the AVHWDeviceContext itself will be freed,
+ * optionally invoking a user-specified callback for uninitializing the hardware
+ * state.
+ */
+typedef struct AVHWDeviceContext {
+ /**
+ * A class for logging. Set by av_hwdevice_ctx_alloc().
+ */
+ const AVClass *av_class;
+
+ /**
+ * Private data used internally by libavutil. Must not be accessed in any
+ * way by the caller.
+ */
+ AVHWDeviceInternal *internal;
+
+ /**
+ * This field identifies the underlying API used for hardware access.
+ *
+ * This field is set when this struct is allocated and never changed
+ * afterwards.
+ */
+ enum AVHWDeviceType type;
+
+ /**
+ * The format-specific data, allocated and freed by libavutil along with
+ * this context.
+ *
+ * Should be cast by the user to the format-specific context defined in the
+ * corresponding header (hwcontext_*.h) and filled as described in the
+ * documentation before calling av_hwdevice_ctx_init().
+ *
+ * After calling av_hwdevice_ctx_init() this struct should not be modified
+ * by the caller.
+ */
+ void *hwctx;
+
+ /**
+ * This field may be set by the caller before calling av_hwdevice_ctx_init().
+ *
+ * If non-NULL, this callback will be called when the last reference to
+ * this context is unreferenced, immediately before it is freed.
+ *
+ * @note when other objects (e.g an AVHWFramesContext) are derived from this
+ * struct, this callback will be invoked after all such child objects
+ * are fully uninitialized and their respective destructors invoked.
+ */
+ void (*free)(struct AVHWDeviceContext *ctx);
+
+ /**
+ * Arbitrary user data, to be used e.g. by the free() callback.
+ */
+ void *user_opaque;
+} AVHWDeviceContext;
+
+typedef struct AVHWFramesInternal AVHWFramesInternal;
+
+/**
+ * This struct describes a set or pool of "hardware" frames (i.e. those with
+ * data not located in normal system memory). All the frames in the pool are
+ * assumed to be allocated in the same way and interchangeable.
+ *
+ * This struct is reference-counted with the AVBuffer mechanism and tied to a
+ * given AVHWDeviceContext instance. The av_hwframe_ctx_alloc() constructor
+ * yields a reference, whose data field points to the actual AVHWFramesContext
+ * struct.
+ */
+typedef struct AVHWFramesContext {
+ /**
+ * A class for logging.
+ */
+ const AVClass *av_class;
+
+ /**
+ * Private data used internally by libavutil. Must not be accessed in any
+ * way by the caller.
+ */
+ AVHWFramesInternal *internal;
+
+ /**
+ * A reference to the parent AVHWDeviceContext. This reference is owned and
+ * managed by the enclosing AVHWFramesContext, but the caller may derive
+ * additional references from it.
+ */
+ AVBufferRef *device_ref;
+
+ /**
+ * The parent AVHWDeviceContext. This is simply a pointer to
+ * device_ref->data provided for convenience.
+ *
+ * Set by libavutil in av_hwframe_ctx_init().
+ */
+ AVHWDeviceContext *device_ctx;
+
+ /**
+ * The format-specific data, allocated and freed automatically along with
+ * this context.
+ *
+ * Should be cast by the user to the format-specific context defined in the
+ * corresponding header (hwframe_*.h) and filled as described in the
+ * documentation before calling av_hwframe_ctx_init().
+ *
+ * After any frames using this context are created, the contents of this
+ * struct should not be modified by the caller.
+ */
+ void *hwctx;
+
+ /**
+ * This field may be set by the caller before calling av_hwframe_ctx_init().
+ *
+ * If non-NULL, this callback will be called when the last reference to
+ * this context is unreferenced, immediately before it is freed.
+ */
+ void (*free)(struct AVHWFramesContext *ctx);
+
+ /**
+ * Arbitrary user data, to be used e.g. by the free() callback.
+ */
+ void *user_opaque;
+
+ /**
+ * A pool from which the frames are allocated by av_hwframe_get_buffer().
+ * This field may be set by the caller before calling av_hwframe_ctx_init().
+ * The buffers returned by calling av_buffer_pool_get() on this pool must
+ * have the properties described in the documentation in the corresponding hw
+ * type's header (hwcontext_*.h). The pool will be freed strictly before
+ * this struct's free() callback is invoked.
+ *
+ * This field may be NULL, then libavutil will attempt to allocate a pool
+ * internally. Note that certain device types enforce pools allocated at
+ * fixed size (frame count), which cannot be extended dynamically. In such a
+ * case, initial_pool_size must be set appropriately.
+ */
+ AVBufferPool *pool;
+
+ /**
+ * Initial size of the frame pool. If a device type does not support
+ * dynamically resizing the pool, then this is also the maximum pool size.
+ *
+ * May be set by the caller before calling av_hwframe_ctx_init(). Must be
+ * set if pool is NULL and the device type does not support dynamic pools.
+ */
+ int initial_pool_size;
+
+ /**
+ * The pixel format identifying the underlying HW surface type.
+ *
+ * Must be a hwaccel format, i.e. the corresponding descriptor must have the
+ * AV_PIX_FMT_FLAG_HWACCEL flag set.
+ *
+ * Must be set by the user before calling av_hwframe_ctx_init().
+ */
+ enum AVPixelFormat format;
+
+ /**
+ * The pixel format identifying the actual data layout of the hardware
+ * frames.
+ *
+ * Must be set by the caller before calling av_hwframe_ctx_init().
+ *
+ * @note when the underlying API does not provide the exact data layout, but
+ * only the colorspace/bit depth, this field should be set to the fully
+ * planar version of that format (e.g. for 8-bit 420 YUV it should be
+ * AV_PIX_FMT_YUV420P, not AV_PIX_FMT_NV12 or anything else).
+ */
+ enum AVPixelFormat sw_format;
+
+ /**
+ * The allocated dimensions of the frames in this pool.
+ *
+ * Must be set by the user before calling av_hwframe_ctx_init().
+ */
+ int width, height;
+} AVHWFramesContext;
+
+/**
+ * Look up an AVHWDeviceType by name.
+ *
+ * @param name String name of the device type (case-insensitive).
+ * @return The type from enum AVHWDeviceType, or AV_HWDEVICE_TYPE_NONE if
+ * not found.
+ */
+enum AVHWDeviceType av_hwdevice_find_type_by_name(const char *name);
+
+/** Get the string name of an AVHWDeviceType.
+ *
+ * @param type Type from enum AVHWDeviceType.
+ * @return Pointer to a static string containing the name, or NULL if the type
+ * is not valid.
+ */
+const char *av_hwdevice_get_type_name(enum AVHWDeviceType type);
+
+/**
+ * Iterate over supported device types.
+ *
+ * @param prev AV_HWDEVICE_TYPE_NONE initially, then the previous type
+ * returned by this function in subsequent iterations.
+ * @return The next usable device type from enum AVHWDeviceType, or
+ * AV_HWDEVICE_TYPE_NONE if there are no more.
+ */
+enum AVHWDeviceType av_hwdevice_iterate_types(enum AVHWDeviceType prev);
+
+/**
+ * Allocate an AVHWDeviceContext for a given hardware type.
+ *
+ * @param type the type of the hardware device to allocate.
+ * @return a reference to the newly created AVHWDeviceContext on success or NULL
+ * on failure.
+ */
+AVBufferRef *av_hwdevice_ctx_alloc(enum AVHWDeviceType type);
+
+/**
+ * Finalize the device context before use. This function must be called after
+ * the context is filled with all the required information and before it is
+ * used in any way.
+ *
+ * @param ref a reference to the AVHWDeviceContext
+ * @return 0 on success, a negative AVERROR code on failure
+ */
+int av_hwdevice_ctx_init(AVBufferRef *ref);
+
+/**
+ * Open a device of the specified type and create an AVHWDeviceContext for it.
+ *
+ * This is a convenience function intended to cover the simple cases. Callers
+ * who need to fine-tune device creation/management should open the device
+ * manually and then wrap it in an AVHWDeviceContext using
+ * av_hwdevice_ctx_alloc()/av_hwdevice_ctx_init().
+ *
+ * The returned context is already initialized and ready for use, the caller
+ * should not call av_hwdevice_ctx_init() on it. The user_opaque/free fields of
+ * the created AVHWDeviceContext are set by this function and should not be
+ * touched by the caller.
+ *
+ * @param device_ctx On success, a reference to the newly-created device context
+ * will be written here. The reference is owned by the caller
+ * and must be released with av_buffer_unref() when no longer
+ * needed. On failure, NULL will be written to this pointer.
+ * @param type The type of the device to create.
+ * @param device A type-specific string identifying the device to open.
+ * @param opts A dictionary of additional (type-specific) options to use in
+ * opening the device. The dictionary remains owned by the caller.
+ * @param flags currently unused
+ *
+ * @return 0 on success, a negative AVERROR code on failure.
+ */
+int av_hwdevice_ctx_create(AVBufferRef **device_ctx, enum AVHWDeviceType type,
+ const char *device, AVDictionary *opts, int flags);
+
+/**
+ * Create a new device of the specified type from an existing device.
+ *
+ * If the source device is a device of the target type or was originally
+ * derived from such a device (possibly through one or more intermediate
+ * devices of other types), then this will return a reference to the
+ * existing device of the same type as is requested.
+ *
+ * Otherwise, it will attempt to derive a new device from the given source
+ * device. If direct derivation to the new type is not implemented, it will
+ * attempt the same derivation from each ancestor of the source device in
+ * turn looking for an implemented derivation method.
+ *
+ * @param dst_ctx On success, a reference to the newly-created
+ * AVHWDeviceContext.
+ * @param type The type of the new device to create.
+ * @param src_ctx A reference to an existing AVHWDeviceContext which will be
+ * used to create the new device.
+ * @param flags Currently unused; should be set to zero.
+ * @return Zero on success, a negative AVERROR code on failure.
+ */
+int av_hwdevice_ctx_create_derived(AVBufferRef **dst_ctx,
+ enum AVHWDeviceType type,
+ AVBufferRef *src_ctx, int flags);
+
+/**
+ * Create a new device of the specified type from an existing device.
+ *
+ * This function performs the same action as av_hwdevice_ctx_create_derived,
+ * however, it is able to set options for the new device to be derived.
+ *
+ * @param dst_ctx On success, a reference to the newly-created
+ * AVHWDeviceContext.
+ * @param type The type of the new device to create.
+ * @param src_ctx A reference to an existing AVHWDeviceContext which will be
+ * used to create the new device.
+ * @param options Options for the new device to create, same format as in
+ * av_hwdevice_ctx_create.
+ * @param flags Currently unused; should be set to zero.
+ * @return Zero on success, a negative AVERROR code on failure.
+ */
+int av_hwdevice_ctx_create_derived_opts(AVBufferRef **dst_ctx,
+ enum AVHWDeviceType type,
+ AVBufferRef *src_ctx,
+ AVDictionary *options, int flags);
+
+/**
+ * Allocate an AVHWFramesContext tied to a given device context.
+ *
+ * @param device_ctx a reference to a AVHWDeviceContext. This function will make
+ * a new reference for internal use, the one passed to the
+ * function remains owned by the caller.
+ * @return a reference to the newly created AVHWFramesContext on success or NULL
+ * on failure.
+ */
+AVBufferRef *av_hwframe_ctx_alloc(AVBufferRef *device_ctx);
+
+/**
+ * Finalize the context before use. This function must be called after the
+ * context is filled with all the required information and before it is attached
+ * to any frames.
+ *
+ * @param ref a reference to the AVHWFramesContext
+ * @return 0 on success, a negative AVERROR code on failure
+ */
+int av_hwframe_ctx_init(AVBufferRef *ref);
+
+/**
+ * Allocate a new frame attached to the given AVHWFramesContext.
+ *
+ * @param hwframe_ctx a reference to an AVHWFramesContext
+ * @param frame an empty (freshly allocated or unreffed) frame to be filled with
+ * newly allocated buffers.
+ * @param flags currently unused, should be set to zero
+ * @return 0 on success, a negative AVERROR code on failure
+ */
+int av_hwframe_get_buffer(AVBufferRef *hwframe_ctx, AVFrame *frame, int flags);
+
+/**
+ * Copy data to or from a hw surface. At least one of dst/src must have an
+ * AVHWFramesContext attached.
+ *
+ * If src has an AVHWFramesContext attached, then the format of dst (if set)
+ * must use one of the formats returned by av_hwframe_transfer_get_formats(src,
+ * AV_HWFRAME_TRANSFER_DIRECTION_FROM).
+ * If dst has an AVHWFramesContext attached, then the format of src must use one
+ * of the formats returned by av_hwframe_transfer_get_formats(dst,
+ * AV_HWFRAME_TRANSFER_DIRECTION_TO)
+ *
+ * dst may be "clean" (i.e. with data/buf pointers unset), in which case the
+ * data buffers will be allocated by this function using av_frame_get_buffer().
+ * If dst->format is set, then this format will be used, otherwise (when
+ * dst->format is AV_PIX_FMT_NONE) the first acceptable format will be chosen.
+ *
+ * The two frames must have matching allocated dimensions (i.e. equal to
+ * AVHWFramesContext.width/height), since not all device types support
+ * transferring a sub-rectangle of the whole surface. The display dimensions
+ * (i.e. AVFrame.width/height) may be smaller than the allocated dimensions, but
+ * also have to be equal for both frames. When the display dimensions are
+ * smaller than the allocated dimensions, the content of the padding in the
+ * destination frame is unspecified.
+ *
+ * @param dst the destination frame. dst is not touched on failure.
+ * @param src the source frame.
+ * @param flags currently unused, should be set to zero
+ * @return 0 on success, a negative AVERROR error code on failure.
+ */
+int av_hwframe_transfer_data(AVFrame *dst, const AVFrame *src, int flags);
+
+enum AVHWFrameTransferDirection {
+ /**
+ * Transfer the data from the queried hw frame.
+ */
+ AV_HWFRAME_TRANSFER_DIRECTION_FROM,
+
+ /**
+ * Transfer the data to the queried hw frame.
+ */
+ AV_HWFRAME_TRANSFER_DIRECTION_TO,
+};
+
+/**
+ * Get a list of possible source or target formats usable in
+ * av_hwframe_transfer_data().
+ *
+ * @param hwframe_ctx the frame context to obtain the information for
+ * @param dir the direction of the transfer
+ * @param formats the pointer to the output format list will be written here.
+ * The list is terminated with AV_PIX_FMT_NONE and must be freed
+ * by the caller when no longer needed using av_free().
+ * If this function returns successfully, the format list will
+ * have at least one item (not counting the terminator).
+ * On failure, the contents of this pointer are unspecified.
+ * @param flags currently unused, should be set to zero
+ * @return 0 on success, a negative AVERROR code on failure.
+ */
+int av_hwframe_transfer_get_formats(AVBufferRef *hwframe_ctx,
+ enum AVHWFrameTransferDirection dir,
+ enum AVPixelFormat **formats, int flags);
+
+
+/**
+ * This struct describes the constraints on hardware frames attached to
+ * a given device with a hardware-specific configuration. This is returned
+ * by av_hwdevice_get_hwframe_constraints() and must be freed by
+ * av_hwframe_constraints_free() after use.
+ */
+typedef struct AVHWFramesConstraints {
+ /**
+ * A list of possible values for format in the hw_frames_ctx,
+ * terminated by AV_PIX_FMT_NONE. This member will always be filled.
+ */
+ enum AVPixelFormat *valid_hw_formats;
+
+ /**
+ * A list of possible values for sw_format in the hw_frames_ctx,
+ * terminated by AV_PIX_FMT_NONE. Can be NULL if this information is
+ * not known.
+ */
+ enum AVPixelFormat *valid_sw_formats;
+
+ /**
+ * The minimum size of frames in this hw_frames_ctx.
+ * (Zero if not known.)
+ */
+ int min_width;
+ int min_height;
+
+ /**
+ * The maximum size of frames in this hw_frames_ctx.
+ * (INT_MAX if not known / no limit.)
+ */
+ int max_width;
+ int max_height;
+} AVHWFramesConstraints;
+
+/**
+ * Allocate a HW-specific configuration structure for a given HW device.
+ * After use, the user must free all members as required by the specific
+ * hardware structure being used, then free the structure itself with
+ * av_free().
+ *
+ * @param device_ctx a reference to the associated AVHWDeviceContext.
+ * @return The newly created HW-specific configuration structure on
+ * success or NULL on failure.
+ */
+void *av_hwdevice_hwconfig_alloc(AVBufferRef *device_ctx);
+
+/**
+ * Get the constraints on HW frames given a device and the HW-specific
+ * configuration to be used with that device. If no HW-specific
+ * configuration is provided, returns the maximum possible capabilities
+ * of the device.
+ *
+ * @param ref a reference to the associated AVHWDeviceContext.
+ * @param hwconfig a filled HW-specific configuration structure, or NULL
+ * to return the maximum possible capabilities of the device.
+ * @return AVHWFramesConstraints structure describing the constraints
+ * on the device, or NULL if not available.
+ */
+AVHWFramesConstraints *av_hwdevice_get_hwframe_constraints(AVBufferRef *ref,
+ const void *hwconfig);
+
+/**
+ * Free an AVHWFrameConstraints structure.
+ *
+ * @param constraints The (filled or unfilled) AVHWFrameConstraints structure.
+ */
+void av_hwframe_constraints_free(AVHWFramesConstraints **constraints);
+
+
+/**
+ * Flags to apply to frame mappings.
+ */
+enum {
+ /**
+ * The mapping must be readable.
+ */
+ AV_HWFRAME_MAP_READ = 1 << 0,
+ /**
+ * The mapping must be writeable.
+ */
+ AV_HWFRAME_MAP_WRITE = 1 << 1,
+ /**
+ * The mapped frame will be overwritten completely in subsequent
+ * operations, so the current frame data need not be loaded. Any values
+ * which are not overwritten are unspecified.
+ */
+ AV_HWFRAME_MAP_OVERWRITE = 1 << 2,
+ /**
+ * The mapping must be direct. That is, there must not be any copying in
+ * the map or unmap steps. Note that performance of direct mappings may
+ * be much lower than normal memory.
+ */
+ AV_HWFRAME_MAP_DIRECT = 1 << 3,
+};
+
+/**
+ * Map a hardware frame.
+ *
+ * This has a number of different possible effects, depending on the format
+ * and origin of the src and dst frames. On input, src should be a usable
+ * frame with valid buffers and dst should be blank (typically as just created
+ * by av_frame_alloc()). src should have an associated hwframe context, and
+ * dst may optionally have a format and associated hwframe context.
+ *
+ * If src was created by mapping a frame from the hwframe context of dst,
+ * then this function undoes the mapping - dst is replaced by a reference to
+ * the frame that src was originally mapped from.
+ *
+ * If both src and dst have an associated hwframe context, then this function
+ * attempts to map the src frame from its hardware context to that of dst and
+ * then fill dst with appropriate data to be usable there. This will only be
+ * possible if the hwframe contexts and associated devices are compatible -
+ * given compatible devices, av_hwframe_ctx_create_derived() can be used to
+ * create a hwframe context for dst in which mapping should be possible.
+ *
+ * If src has a hwframe context but dst does not, then the src frame is
+ * mapped to normal memory and should thereafter be usable as a normal frame.
+ * If the format is set on dst, then the mapping will attempt to create dst
+ * with that format and fail if it is not possible. If format is unset (is
+ * AV_PIX_FMT_NONE) then dst will be mapped with whatever the most appropriate
+ * format to use is (probably the sw_format of the src hwframe context).
+ *
+ * A return value of AVERROR(ENOSYS) indicates that the mapping is not
+ * possible with the given arguments and hwframe setup, while other return
+ * values indicate that it failed somehow.
+ *
+ * On failure, the destination frame will be left blank, except for the
+ * hw_frames_ctx/format fields thay may have been set by the caller - those will
+ * be preserved as they were.
+ *
+ * @param dst Destination frame, to contain the mapping.
+ * @param src Source frame, to be mapped.
+ * @param flags Some combination of AV_HWFRAME_MAP_* flags.
+ * @return Zero on success, negative AVERROR code on failure.
+ */
+int av_hwframe_map(AVFrame *dst, const AVFrame *src, int flags);
+
+
+/**
+ * Create and initialise an AVHWFramesContext as a mapping of another existing
+ * AVHWFramesContext on a different device.
+ *
+ * av_hwframe_ctx_init() should not be called after this.
+ *
+ * @param derived_frame_ctx On success, a reference to the newly created
+ * AVHWFramesContext.
+ * @param format The AVPixelFormat for the derived context.
+ * @param derived_device_ctx A reference to the device to create the new
+ * AVHWFramesContext on.
+ * @param source_frame_ctx A reference to an existing AVHWFramesContext
+ * which will be mapped to the derived context.
+ * @param flags Some combination of AV_HWFRAME_MAP_* flags, defining the
+ * mapping parameters to apply to frames which are allocated
+ * in the derived device.
+ * @return Zero on success, negative AVERROR code on failure.
+ */
+int av_hwframe_ctx_create_derived(AVBufferRef **derived_frame_ctx,
+ enum AVPixelFormat format,
+ AVBufferRef *derived_device_ctx,
+ AVBufferRef *source_frame_ctx,
+ int flags);
+
+#endif /* AVUTIL_HWCONTEXT_H */