diff options
Diffstat (limited to 'src/lib/ffmpeg-2.1/libavutil/mem.pas')
| -rw-r--r-- | src/lib/ffmpeg-2.1/libavutil/mem.pas | 66 |
1 files changed, 51 insertions, 15 deletions
diff --git a/src/lib/ffmpeg-2.1/libavutil/mem.pas b/src/lib/ffmpeg-2.1/libavutil/mem.pas index 17c3461c..d7e0ca90 100644 --- a/src/lib/ffmpeg-2.1/libavutil/mem.pas +++ b/src/lib/ffmpeg-2.1/libavutil/mem.pas @@ -42,8 +42,7 @@ function av_malloc(size: size_t): pointer; cdecl; external av__util; {av_malloc_attrib av_alloc_size(1)} (** - * Helper function to allocate a block of size * nmemb bytes with - * using av_malloc() + * Allocate a block of size * nmemb bytes with av_malloc(). * @param nmemb Number of elements * @param size Size of the single element * @return Pointer to the allocated block, NULL if the block cannot @@ -55,14 +54,20 @@ function av_malloc_array(nmemb: size_t; size: size_t): pointer; {$IFDEF HasInlin (** * Allocate or reallocate a block of memory. - * If ptr is NULL and size > 0, allocate a new block. If + * If ptr is NULL and size > 0, allocate a new block. If * size is zero, free the memory block pointed to by ptr. * @param ptr Pointer to a memory block already allocated with - * av_malloc(z)() or av_realloc() or NULL. - * @param size Size in bytes for the memory block to be allocated or + * av_realloc() or NULL. + * @param size Size in bytes of the memory block to be allocated or * reallocated. - * @return Pointer to a newly reallocated block or NULL if the block - * cannot be allocated or the function is used to free the memory block. + * @return Pointer to a newly-reallocated block or NULL if the block + * cannot be reallocated or the function is used to free the memory block. + * @warning Pointers originating from the av_malloc() family of functions must + * not be passed to av_realloc(). The former can be implemented using + * memalign() (or other functions), and there is no guarantee that + * pointers from such functions can be passed to realloc() at all. + * The situation is undefined according to POSIX and may crash with + * some libc implementations. * @see av_fast_realloc() *) function av_realloc(ptr: pointer; size: size_t): pointer; @@ -80,29 +85,61 @@ function av_realloc_f(ptr: pointer; nelem: size_t; elsize: size_t): pointer; cdecl; external av__util; (** + * Allocate or reallocate a block of memory. + * If *ptr is NULL and size > 0, allocate a new block. If + * size is zero, free the memory block pointed to by ptr. + * @param ptr Pointer to a pointer to a memory block already allocated + * with av_realloc(), or pointer to a pointer to NULL. + * The pointer is updated on success, or freed on failure. + * @param size Size in bytes for the memory block to be allocated or + * reallocated + * @return Zero on success, an AVERROR error code on failure. + * @warning Pointers originating from the av_malloc() family of functions must + * not be passed to av_reallocp(). The former can be implemented using + * memalign() (or other functions), and there is no guarantee that + * pointers from such functions can be passed to realloc() at all. + * The situation is undefined according to POSIX and may crash with + * some libc implementations. + *) +function av_reallocp(ptr: pointer; elsize: size_t): cint; + cdecl; external av__util; + +(** * Allocate or reallocate an array. * If ptr is NULL and nmemb > 0, allocate a new block. If * nmemb is zero, free the memory block pointed to by ptr. * @param ptr Pointer to a memory block already allocated with - * av_malloc(z)() or av_realloc() or NULL. + * av_realloc() or NULL. * @param nmemb Number of elements * @param size Size of the single element - * @return Pointer to a newly reallocated block or NULL if the block + * @return Pointer to a newly-reallocated block or NULL if the block * cannot be reallocated or the function is used to free the memory block. + * @warning Pointers originating from the av_malloc() family of functions must + * not be passed to av_realloc(). The former can be implemented using + * memalign() (or other functions), and there is no guarantee that + * pointers from such functions can be passed to realloc() at all. + * The situation is undefined according to POSIX and may crash with + * some libc implementations. *) function av_realloc_array(ptr: pointer; nmemb, size: size_t): pointer; {av_alloc_size(2, 3)} cdecl; external av__util; (** - * Allocate or reallocate an array. + * Allocate or reallocate an array through a pointer to a pointer. * If *ptr is NULL and nmemb > 0, allocate a new block. If * nmemb is zero, free the memory block pointed to by ptr. * @param ptr Pointer to a pointer to a memory block already allocated - * with av_malloc(z)() or av_realloc(), or pointer to a pointer to NULL. + * with av_realloc(), or pointer to a pointer to NULL. * The pointer is updated on success, or freed on failure. * @param nmemb Number of elements * @param size Size of the single element * @return Zero on success, an AVERROR error code on failure. + * @warning Pointers originating from the av_malloc() family of functions must + * not be passed to av_realloc(). The former can be implemented using + * memalign() (or other functions), and there is no guarantee that + * pointers from such functions can be passed to realloc() at all. + * The situation is undefined according to POSIX and may crash with + * some libc implementations. *) function av_reallocp_array(ptr: pointer; nmemb, size: size_t): cint; {av_alloc_size(2, 3)} cdecl; external av__util; @@ -143,8 +180,7 @@ function av_calloc(nmemb: size_t; size: size_t): pointer; cdecl; external av__util; {av_malloc_attrib} (** - * Helper function to allocate a block of size * nmemb bytes with - * using av_mallocz() + * Allocate a block of size * nmemb bytes with av_mallocz(). * @param nmemb Number of elements * @param size Size of the single element * @return Pointer to the allocated block, NULL if the block cannot @@ -158,7 +194,7 @@ function av_mallocz_array(nmemb: size_t; size: size_t): pointer; {$IFDEF HasInli (** * Duplicate the string s. * @param s string to be duplicated. - * @return Pointer to a newly allocated string containing a + * @return Pointer to a newly-allocated string containing a * copy of s or NULL if the string cannot be allocated. *) function av_strdup({const} s: PAnsiChar): PAnsiChar; @@ -254,7 +290,7 @@ procedure av_max_alloc(max: size_t); cdecl; external av__util; (** - * @brief deliberately overlapping memcpy implementation + * deliberately overlapping memcpy implementation * @param dst destination buffer * @param back how many bytes back we start (the initial size of the overlapping window), must be > 0 * @param cnt number of bytes to copy, must be >= 0 |