proc av_hwdevice_ctx_alloc(type: AVHWDeviceType): ptr AVBufferRef {.importc,
    cdecl, ...raises: [], tags: [], forbids: [].}

proc av_hwdevice_ctx_create(device_ctx: ptr ptr AVBufferRef;
                            type: AVHWDeviceType; device: cstring;
                            opts: ptr AVDictionary; flags: cint): cint {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}

proc av_hwdevice_ctx_create_derived(dst_ctx: ptr ptr AVBufferRef;
                                    type: AVHWDeviceType;
                                    src_ctx: ptr AVBufferRef; flags: cint): cint {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}

proc av_hwdevice_ctx_create_derived_opts(dst_ctx: ptr ptr AVBufferRef;
    type: AVHWDeviceType; src_ctx: ptr AVBufferRef; options: ptr AVDictionary;
    flags: cint) {.importc, cdecl, ...raises: [], tags: [], forbids: [].}

proc av_hwdevice_ctx_init(ref: ptr AVBufferRef): cint {.importc, cdecl,
    ...raises: [], tags: [], forbids: [].}

proc av_hwdevice_find_type_by_name(namme: cstring): AVHWDeviceType {.importc,
    cdecl, ...raises: [], tags: [], forbids: [].}

proc av_hwdevice_get_hwframe_constraints(ref: ptr AVBufferRef; hwconfig: pointer): ptr AVHWFramesConstraints {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}

proc av_hwdevice_get_type_name(type: AVHWDeviceType): cstring {.importc, cdecl,
    ...raises: [], tags: [], forbids: [].}

proc av_hwdevice_hwconfig_alloc(device_ctx: ptr AVBufferRef): pointer {.importc,
    cdecl, ...raises: [], tags: [], forbids: [].}

proc av_hwdevice_iterate_types(prev: AVHWDeviceType): AVHWDeviceType {.importc,
    cdecl, ...raises: [], tags: [], forbids: [].}

proc av_hwframe_constraints_free(constraints: ptr ptr AVHWFramesConstraints) {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}

proc av_hwframe_ctx_alloc(device_ctx: ptr AVBufferRef): ptr AVBufferRef {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}

proc av_hwframe_ctx_create_derived(derived_frame_ctx: ptr ptr AVBufferRef;
                                   format: AVPixelFormat; derived_device_ctx,
    source_frame_ctx: ptr AVBufferRef): cint {.importc, cdecl, ...raises: [],
    tags: [], forbids: [].}

proc av_hwframe_ctx_init(ref: ptr AVBufferRef): cint {.importc, cdecl,
    ...raises: [], tags: [], forbids: [].}

proc av_hwframe_get_buffer(hwframe_ctx: ptr AVBufferRef; frame: ptr AVFrame;
                           flags: cint): cint {.importc, cdecl, ...raises: [],
    tags: [], forbids: [].}

proc av_hwframe_map(dst, src: ptr AVFrame; flags: cint): cint {.importc, cdecl,
    ...raises: [], tags: [], forbids: [].}

proc av_hwframe_transfer_data(dst, src: ptr AVFrame; flags: cint): cint {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}

proc av_hwframe_transfer_get_formats(hwframe_ctx: ptr AVBufferRef;
                                     dir: AVHWFrameTransferDirection;
                                     formats: ptr ptr AVPixelFormat; flags: cint): cint {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}