@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.
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.