Function ffmpeg_sys_the_third::avio_alloc_context

pub unsafe extern "C" fn avio_alloc_context(
    buffer: *mut c_uchar,
    buffer_size: c_int,
    write_flag: c_int,
    opaque: *mut c_void,
    read_packet: Option<unsafe extern "C" fn(opaque: *mut c_void, buf: *mut u8, buf_size: c_int) -> c_int>,
    write_packet: Option<unsafe extern "C" fn(opaque: *mut c_void, buf: *mut u8, buf_size: c_int) -> c_int>,
    seek: Option<unsafe extern "C" fn(opaque: *mut c_void, offset: i64, whence: c_int) -> i64>
) -> *mut AVIOContext

Allocate and initialize an AVIOContext for buffered I/O. It must be later freed with avio_context_free().

@param buffer Memory block for input/output operations via AVIOContext. The buffer must be allocated with av_malloc() and friends. It may be freed and replaced with a new buffer by libavformat. AVIOContext.buffer holds the buffer currently in use, which must be later freed with av_free(). @param buffer_size The buffer size is very important for performance. For protocols with fixed blocksize it should be set to this blocksize. For others a typical size is a cache page, e.g. 4kb. @param write_flag Set to 1 if the buffer should be writable, 0 otherwise. @param opaque An opaque pointer to user-specific data. @param read_packet A function for refilling the buffer, may be NULL. For stream protocols, must never return 0 but rather a proper AVERROR code. @param write_packet A function for writing the buffer contents, may be NULL. The function may not change the input buffers content. @param seek A function for seeking to specified byte position, may be NULL.

@return Allocated AVIOContext or NULL on failure.