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