mirror of https://git.ffmpeg.org/ffmpeg.git
581 lines
22 KiB
C
581 lines
22 KiB
C
/*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; 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_D3D11VA,
|
|
};
|
|
|
|
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 type 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);
|
|
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* @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 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 */
|