You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
322 lines
12 KiB
322 lines
12 KiB
/*
|
|
* 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
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* @ingroup lavu_buffer
|
|
* refcounted data buffer API
|
|
*/
|
|
|
|
#ifndef AVUTIL_BUFFER_H
|
|
#define AVUTIL_BUFFER_H
|
|
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
|
|
/**
|
|
* @defgroup lavu_buffer AVBuffer
|
|
* @ingroup lavu_data
|
|
*
|
|
* @{
|
|
* AVBuffer is an API for reference-counted data buffers.
|
|
*
|
|
* There are two core objects in this API -- AVBuffer and AVBufferRef. AVBuffer
|
|
* represents the data buffer itself; it is opaque and not meant to be accessed
|
|
* by the caller directly, but only through AVBufferRef. However, the caller may
|
|
* e.g. compare two AVBuffer pointers to check whether two different references
|
|
* are describing the same data buffer. AVBufferRef represents a single
|
|
* reference to an AVBuffer and it is the object that may be manipulated by the
|
|
* caller directly.
|
|
*
|
|
* There are two functions provided for creating a new AVBuffer with a single
|
|
* reference -- av_buffer_alloc() to just allocate a new buffer, and
|
|
* av_buffer_create() to wrap an existing array in an AVBuffer. From an existing
|
|
* reference, additional references may be created with av_buffer_ref().
|
|
* Use av_buffer_unref() to free a reference (this will automatically free the
|
|
* data once all the references are freed).
|
|
*
|
|
* The convention throughout this API and the rest of FFmpeg is such that the
|
|
* buffer is considered writable if there exists only one reference to it (and
|
|
* it has not been marked as read-only). The av_buffer_is_writable() function is
|
|
* provided to check whether this is true and av_buffer_make_writable() will
|
|
* automatically create a new writable buffer when necessary.
|
|
* Of course nothing prevents the calling code from violating this convention,
|
|
* however that is safe only when all the existing references are under its
|
|
* control.
|
|
*
|
|
* @note Referencing and unreferencing the buffers is thread-safe and thus
|
|
* may be done from multiple threads simultaneously without any need for
|
|
* additional locking.
|
|
*
|
|
* @note Two different references to the same buffer can point to different
|
|
* parts of the buffer (i.e. their AVBufferRef.data will not be equal).
|
|
*/
|
|
|
|
/**
|
|
* A reference counted buffer type. It is opaque and is meant to be used through
|
|
* references (AVBufferRef).
|
|
*/
|
|
typedef struct AVBuffer AVBuffer;
|
|
|
|
/**
|
|
* A reference to a data buffer.
|
|
*
|
|
* The size of this struct is not a part of the public ABI and it is not meant
|
|
* to be allocated directly.
|
|
*/
|
|
typedef struct AVBufferRef {
|
|
AVBuffer *buffer;
|
|
|
|
/**
|
|
* The data buffer. It is considered writable if and only if
|
|
* this is the only reference to the buffer, in which case
|
|
* av_buffer_is_writable() returns 1.
|
|
*/
|
|
uint8_t *data;
|
|
/**
|
|
* Size of data in bytes.
|
|
*/
|
|
size_t size;
|
|
} AVBufferRef;
|
|
|
|
/**
|
|
* Allocate an AVBuffer of the given size using av_malloc().
|
|
*
|
|
* @return an AVBufferRef of given size or NULL when out of memory
|
|
*/
|
|
AVBufferRef *av_buffer_alloc(size_t size);
|
|
|
|
/**
|
|
* Same as av_buffer_alloc(), except the returned buffer will be initialized
|
|
* to zero.
|
|
*/
|
|
AVBufferRef *av_buffer_allocz(size_t size);
|
|
|
|
/**
|
|
* Always treat the buffer as read-only, even when it has only one
|
|
* reference.
|
|
*/
|
|
#define AV_BUFFER_FLAG_READONLY (1 << 0)
|
|
|
|
/**
|
|
* Create an AVBuffer from an existing array.
|
|
*
|
|
* If this function is successful, data is owned by the AVBuffer. The caller may
|
|
* only access data through the returned AVBufferRef and references derived from
|
|
* it.
|
|
* If this function fails, data is left untouched.
|
|
* @param data data array
|
|
* @param size size of data in bytes
|
|
* @param free a callback for freeing this buffer's data
|
|
* @param opaque parameter to be got for processing or passed to free
|
|
* @param flags a combination of AV_BUFFER_FLAG_*
|
|
*
|
|
* @return an AVBufferRef referring to data on success, NULL on failure.
|
|
*/
|
|
AVBufferRef *av_buffer_create(uint8_t *data, size_t size,
|
|
void (*free)(void *opaque, uint8_t *data),
|
|
void *opaque, int flags);
|
|
|
|
/**
|
|
* Default free callback, which calls av_free() on the buffer data.
|
|
* This function is meant to be passed to av_buffer_create(), not called
|
|
* directly.
|
|
*/
|
|
void av_buffer_default_free(void *opaque, uint8_t *data);
|
|
|
|
/**
|
|
* Create a new reference to an AVBuffer.
|
|
*
|
|
* @return a new AVBufferRef referring to the same AVBuffer as buf or NULL on
|
|
* failure.
|
|
*/
|
|
AVBufferRef *av_buffer_ref(const AVBufferRef *buf);
|
|
|
|
/**
|
|
* Free a given reference and automatically free the buffer if there are no more
|
|
* references to it.
|
|
*
|
|
* @param buf the reference to be freed. The pointer is set to NULL on return.
|
|
*/
|
|
void av_buffer_unref(AVBufferRef **buf);
|
|
|
|
/**
|
|
* @return 1 if the caller may write to the data referred to by buf (which is
|
|
* true if and only if buf is the only reference to the underlying AVBuffer).
|
|
* Return 0 otherwise.
|
|
* A positive answer is valid until av_buffer_ref() is called on buf.
|
|
*/
|
|
int av_buffer_is_writable(const AVBufferRef *buf);
|
|
|
|
/**
|
|
* @return the opaque parameter set by av_buffer_create.
|
|
*/
|
|
void *av_buffer_get_opaque(const AVBufferRef *buf);
|
|
|
|
int av_buffer_get_ref_count(const AVBufferRef *buf);
|
|
|
|
/**
|
|
* Create a writable reference from a given buffer reference, avoiding data copy
|
|
* if possible.
|
|
*
|
|
* @param buf buffer reference to make writable. On success, buf is either left
|
|
* untouched, or it is unreferenced and a new writable AVBufferRef is
|
|
* written in its place. On failure, buf is left untouched.
|
|
* @return 0 on success, a negative AVERROR on failure.
|
|
*/
|
|
int av_buffer_make_writable(AVBufferRef **buf);
|
|
|
|
/**
|
|
* Reallocate a given buffer.
|
|
*
|
|
* @param buf a buffer reference to reallocate. On success, buf will be
|
|
* unreferenced and a new reference with the required size will be
|
|
* written in its place. On failure buf will be left untouched. *buf
|
|
* may be NULL, then a new buffer is allocated.
|
|
* @param size required new buffer size.
|
|
* @return 0 on success, a negative AVERROR on failure.
|
|
*
|
|
* @note the buffer is actually reallocated with av_realloc() only if it was
|
|
* initially allocated through av_buffer_realloc(NULL) and there is only one
|
|
* reference to it (i.e. the one passed to this function). In all other cases
|
|
* a new buffer is allocated and the data is copied.
|
|
*/
|
|
int av_buffer_realloc(AVBufferRef **buf, size_t size);
|
|
|
|
/**
|
|
* Ensure dst refers to the same data as src.
|
|
*
|
|
* When *dst is already equivalent to src, do nothing. Otherwise unreference dst
|
|
* and replace it with a new reference to src.
|
|
*
|
|
* @param dst Pointer to either a valid buffer reference or NULL. On success,
|
|
* this will point to a buffer reference equivalent to src. On
|
|
* failure, dst will be left untouched.
|
|
* @param src A buffer reference to replace dst with. May be NULL, then this
|
|
* function is equivalent to av_buffer_unref(dst).
|
|
* @return 0 on success
|
|
* AVERROR(ENOMEM) on memory allocation failure.
|
|
*/
|
|
int av_buffer_replace(AVBufferRef **dst, const AVBufferRef *src);
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
/**
|
|
* @defgroup lavu_bufferpool AVBufferPool
|
|
* @ingroup lavu_data
|
|
*
|
|
* @{
|
|
* AVBufferPool is an API for a lock-free thread-safe pool of AVBuffers.
|
|
*
|
|
* Frequently allocating and freeing large buffers may be slow. AVBufferPool is
|
|
* meant to solve this in cases when the caller needs a set of buffers of the
|
|
* same size (the most obvious use case being buffers for raw video or audio
|
|
* frames).
|
|
*
|
|
* At the beginning, the user must call av_buffer_pool_init() to create the
|
|
* buffer pool. Then whenever a buffer is needed, call av_buffer_pool_get() to
|
|
* get a reference to a new buffer, similar to av_buffer_alloc(). This new
|
|
* reference works in all aspects the same way as the one created by
|
|
* av_buffer_alloc(). However, when the last reference to this buffer is
|
|
* unreferenced, it is returned to the pool instead of being freed and will be
|
|
* reused for subsequent av_buffer_pool_get() calls.
|
|
*
|
|
* When the caller is done with the pool and no longer needs to allocate any new
|
|
* buffers, av_buffer_pool_uninit() must be called to mark the pool as freeable.
|
|
* Once all the buffers are released, it will automatically be freed.
|
|
*
|
|
* Allocating and releasing buffers with this API is thread-safe as long as
|
|
* either the default alloc callback is used, or the user-supplied one is
|
|
* thread-safe.
|
|
*/
|
|
|
|
/**
|
|
* The buffer pool. This structure is opaque and not meant to be accessed
|
|
* directly. It is allocated with av_buffer_pool_init() and freed with
|
|
* av_buffer_pool_uninit().
|
|
*/
|
|
typedef struct AVBufferPool AVBufferPool;
|
|
|
|
/**
|
|
* Allocate and initialize a buffer pool.
|
|
*
|
|
* @param size size of each buffer in this pool
|
|
* @param alloc a function that will be used to allocate new buffers when the
|
|
* pool is empty. May be NULL, then the default allocator will be used
|
|
* (av_buffer_alloc()).
|
|
* @return newly created buffer pool on success, NULL on error.
|
|
*/
|
|
AVBufferPool *av_buffer_pool_init(size_t size, AVBufferRef* (*alloc)(size_t size));
|
|
|
|
/**
|
|
* Allocate and initialize a buffer pool with a more complex allocator.
|
|
*
|
|
* @param size size of each buffer in this pool
|
|
* @param opaque arbitrary user data used by the allocator
|
|
* @param alloc a function that will be used to allocate new buffers when the
|
|
* pool is empty. May be NULL, then the default allocator will be
|
|
* used (av_buffer_alloc()).
|
|
* @param pool_free a function that will be called immediately before the pool
|
|
* is freed. I.e. after av_buffer_pool_uninit() is called
|
|
* by the caller and all the frames are returned to the pool
|
|
* and freed. It is intended to uninitialize the user opaque
|
|
* data. May be NULL.
|
|
* @return newly created buffer pool on success, NULL on error.
|
|
*/
|
|
AVBufferPool *av_buffer_pool_init2(size_t size, void *opaque,
|
|
AVBufferRef* (*alloc)(void *opaque, size_t size),
|
|
void (*pool_free)(void *opaque));
|
|
|
|
/**
|
|
* Mark the pool as being available for freeing. It will actually be freed only
|
|
* once all the allocated buffers associated with the pool are released. Thus it
|
|
* is safe to call this function while some of the allocated buffers are still
|
|
* in use.
|
|
*
|
|
* @param pool pointer to the pool to be freed. It will be set to NULL.
|
|
*/
|
|
void av_buffer_pool_uninit(AVBufferPool **pool);
|
|
|
|
/**
|
|
* Allocate a new AVBuffer, reusing an old buffer from the pool when available.
|
|
* This function may be called simultaneously from multiple threads.
|
|
*
|
|
* @return a reference to the new buffer on success, NULL on error.
|
|
*/
|
|
AVBufferRef *av_buffer_pool_get(AVBufferPool *pool);
|
|
|
|
/**
|
|
* Query the original opaque parameter of an allocated buffer in the pool.
|
|
*
|
|
* @param ref a buffer reference to a buffer returned by av_buffer_pool_get.
|
|
* @return the opaque parameter set by the buffer allocator function of the
|
|
* buffer pool.
|
|
*
|
|
* @note the opaque parameter of ref is used by the buffer pool implementation,
|
|
* therefore you have to use this function to access the original opaque
|
|
* parameter of an allocated buffer.
|
|
*/
|
|
void *av_buffer_pool_buffer_get_opaque(const AVBufferRef *ref);
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
#endif /* AVUTIL_BUFFER_H */
|
|
|