Re: [FFmpeg-devel] [PATCH] libavutil/hwcontext_vaapi: Re-enable support for libva v1

["Xiang, Haihao" <haihao.xiang-at-intel.com@ffmpeg.org>]

On Fri, 2022-03-11 at 13:24 +0100, Ingo Brückl wrote:
> Commit e050959103f375e6494937fa28ef2c4d2d15c9ef implemented passing in
> modifiers by using the PRIME_2 memory type, which only exists in v2 of
> the library.
> 
> To still support v1 of the library, conditionally compile using
> VA_CHECK_VERSION() for both the new code and the old code before
> the commit.
> ---
>  libavutil/hwcontext_vaapi.c | 57 ++++++++++++++++++++++++++++++++++++-
>  1 file changed, 56 insertions(+), 1 deletion(-)
> 
> diff --git a/libavutil/hwcontext_vaapi.c b/libavutil/hwcontext_vaapi.c
> index 994b744e4d..799490442e 100644
> --- a/libavutil/hwcontext_vaapi.c
> +++ b/libavutil/hwcontext_vaapi.c
> @@ -1026,7 +1026,12 @@ static void vaapi_unmap_from_drm(AVHWFramesContext
> *dst_fc,
>  static int vaapi_map_from_drm(AVHWFramesContext *src_fc, AVFrame *dst,
>                                const AVFrame *src, int flags)
>  {
> +#if VA_CHECK_VERSION(2, 0, 0)
>      VAAPIFramesContext     *src_vafc = src_fc->internal->priv;
> +    int use_prime2;
> +#else
> +    int k;
> +#endif
>      AVHWFramesContext      *dst_fc =
>          (AVHWFramesContext*)dst->hw_frames_ctx->data;
>      AVVAAPIDeviceContext  *dst_dev = dst_fc->device_ctx->hwctx;
> @@ -1034,10 +1039,28 @@ static int vaapi_map_from_drm(AVHWFramesContext
> *src_fc, AVFrame *dst,
>      const VAAPIFormatDescriptor *format_desc;
>      VASurfaceID surface_id;
>      VAStatus vas = VA_STATUS_SUCCESS;
> -    int use_prime2;
>      uint32_t va_fourcc;
>      int err, i, j;
>  
> +#if !VA_CHECK_VERSION(2, 0, 0)
> +    unsigned long buffer_handle;
> +    VASurfaceAttribExternalBuffers buffer_desc;
> +    VASurfaceAttrib attrs[2] = {
> +        {
> +            .type  = VASurfaceAttribMemoryType,
> +            .flags = VA_SURFACE_ATTRIB_SETTABLE,
> +            .value.type    = VAGenericValueTypeInteger,
> +            .value.value.i = VA_SURFACE_ATTRIB_MEM_TYPE_DRM_PRIME,
> +        },
> +        {
> +            .type  = VASurfaceAttribExternalBufferDescriptor,
> +            .flags = VA_SURFACE_ATTRIB_SETTABLE,
> +            .value.type    = VAGenericValueTypePointer,
> +            .value.value.p = &buffer_desc,
> +        }
> +    };
> +#endif
> +
>      desc = (AVDRMFrameDescriptor*)src->data[0];
>  
>      if (desc->nb_objects != 1) {
> @@ -1072,6 +1095,7 @@ static int vaapi_map_from_drm(AVHWFramesContext *src_fc,
> AVFrame *dst,
>      format_desc = vaapi_format_from_fourcc(va_fourcc);
>      av_assert0(format_desc);
>  
> +#if VA_CHECK_VERSION(2, 0, 0)
>      use_prime2 = !src_vafc->prime_2_import_unsupported &&
>                   desc->objects[0].format_modifier != DRM_FORMAT_MOD_INVALID;
>      if (use_prime2) {
> @@ -1183,6 +1207,37 @@ static int vaapi_map_from_drm(AVHWFramesContext
> *src_fc, AVFrame *dst,
>                                 &surface_id, 1,
>                                 buffer_attrs, FF_ARRAY_ELEMS(buffer_attrs));
>      }
> +#else
> +    buffer_handle = desc->objects[0].fd;
> +    buffer_desc.pixel_format = va_fourcc;
> +    buffer_desc.width        = src_fc->width;
> +    buffer_desc.height       = src_fc->height;
> +    buffer_desc.data_size    = desc->objects[0].size;
> +    buffer_desc.buffers      = &buffer_handle;
> +    buffer_desc.num_buffers  = 1;
> +    buffer_desc.flags        = 0;
> +
> +    k = 0;
> +    for (i = 0; i < desc->nb_layers; i++) {
> +        for (j = 0; j < desc->layers[i].nb_planes; j++) {
> +            buffer_desc.pitches[k] = desc->layers[i].planes[j].pitch;
> +            buffer_desc.offsets[k] = desc->layers[i].planes[j].offset;
> +            ++k;
> +        }
> +    }
> +    buffer_desc.num_planes = k;
> +
> +    if (format_desc->chroma_planes_swapped &&
> +        buffer_desc.num_planes == 3) {
> +        FFSWAP(uint32_t, buffer_desc.pitches[1], buffer_desc.pitches[2]);
> +        FFSWAP(uint32_t, buffer_desc.offsets[1], buffer_desc.offsets[2]);
> +    }
> +
> +    vas = vaCreateSurfaces(dst_dev->display, format_desc->rt_format,
> +                           src->width, src->height,
> +                           &surface_id, 1,
> +                           attrs, FF_ARRAY_ELEMS(attrs));
> +#endif
>      if (vas != VA_STATUS_SUCCESS) {
>          av_log(dst_fc, AV_LOG_ERROR, "Failed to create surface from DRM "
>                 "object: %d (%s).\n", vas, vaErrorStr(vas));

LGTM, will apply

-Haihao

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