On Wed,  4 Oct 2017 23:30:52 +0100
Mark Thompson <[email protected]> wrote:

> These are needed for the config structures in the following patch.
> ---
> Fake hwaccels are omitted, they would just be deleted in a later patch 
> without ever being used.
> 
> 
>  libavcodec/hwaccels.h | 59 
> +++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 59 insertions(+)
>  create mode 100644 libavcodec/hwaccels.h
> 
> diff --git a/libavcodec/hwaccels.h b/libavcodec/hwaccels.h
> new file mode 100644
> index 000000000..6dee94b44
> --- /dev/null
> +++ b/libavcodec/hwaccels.h
> @@ -0,0 +1,59 @@
> +/*
> + * This file is part of Libav.
> + *
> + * Libav 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.
> + *
> + * Libav 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 Libav; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 
> USA
> + */
> +
> +#ifndef AVCODEC_HWACCELS_H
> +#define AVCODEC_HWACCELS_H
> +
> +#include "avcodec.h"
> +
> +extern AVHWAccel ff_h263_vaapi_hwaccel;
> +extern AVHWAccel ff_h264_cuvid_hwaccel;
> +extern AVHWAccel ff_h264_d3d11va_hwaccel;
> +extern AVHWAccel ff_h264_d3d11va2_hwaccel;
> +extern AVHWAccel ff_h264_dxva2_hwaccel;
> +extern AVHWAccel ff_h264_vaapi_hwaccel;
> +extern AVHWAccel ff_h264_vda_hwaccel;
> +extern AVHWAccel ff_h264_vda_old_hwaccel;
> +extern AVHWAccel ff_h264_vdpau_hwaccel;
> +extern AVHWAccel ff_hevc_cuvid_hwaccel;
> +extern AVHWAccel ff_hevc_d3d11va_hwaccel;
> +extern AVHWAccel ff_hevc_d3d11va2_hwaccel;
> +extern AVHWAccel ff_hevc_dxva2_hwaccel;
> +extern AVHWAccel ff_hevc_vaapi_hwaccel;
> +extern AVHWAccel ff_hevc_vdpau_hwaccel;
> +extern AVHWAccel ff_mpeg1_vdpau_hwaccel;
> +extern AVHWAccel ff_mpeg2_d3d11va_hwaccel;
> +extern AVHWAccel ff_mpeg2_d3d11va2_hwaccel;
> +extern AVHWAccel ff_mpeg2_dxva2_hwaccel;
> +extern AVHWAccel ff_mpeg2_vaapi_hwaccel;
> +extern AVHWAccel ff_mpeg2_vdpau_hwaccel;
> +extern AVHWAccel ff_mpeg4_vaapi_hwaccel;
> +extern AVHWAccel ff_mpeg4_vdpau_hwaccel;
> +extern AVHWAccel ff_vc1_d3d11va_hwaccel;
> +extern AVHWAccel ff_vc1_d3d11va2_hwaccel;
> +extern AVHWAccel ff_vc1_dxva2_hwaccel;
> +extern AVHWAccel ff_vc1_vaapi_hwaccel;
> +extern AVHWAccel ff_vc1_vdpau_hwaccel;
> +extern AVHWAccel ff_vp8_vaapi_hwaccel;
> +extern AVHWAccel ff_wmv3_d3d11va_hwaccel;
> +extern AVHWAccel ff_wmv3_d3d11va2_hwaccel;
> +extern AVHWAccel ff_wmv3_dxva2_hwaccel;
> +extern AVHWAccel ff_wmv3_vaapi_hwaccel;
> +extern AVHWAccel ff_wmv3_vdpau_hwaccel;
> +
> +#endif /* AVCODEC_HWACCELS_H */

Hm not sure, why not just declare them ad-hoc where they are needed?
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