Re: [FFmpeg-devel] [PATCH v3] vulkan_h264: fill correct ScalingList8x8 entries

[Lynne <dev@lynne.ee>]

Aug 1, 2023, 16:21 by ben@bcheng.me:

> The Vulkan spec wants ScalingList8x8 as defined by ITU spec, which is in
> a different order from how ffmpeg parses it.
>
> v2: generalize for 444 case
> v3: fix whitespace
> ---
>  libavcodec/vulkan_h264.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/libavcodec/vulkan_h264.c b/libavcodec/vulkan_h264.c
> index 84bcef7933..20e03dd26a 100644
> --- a/libavcodec/vulkan_h264.c
> +++ b/libavcodec/vulkan_h264.c
> @@ -43,6 +43,8 @@ typedef struct H264VulkanDecodePicture {
>  VkVideoDecodeH264PictureInfoKHR h264_pic_info;
>  } H264VulkanDecodePicture;
>  
> +const static int h264_scaling_list8_order[] = { 0, 3, 1, 4, 2, 5 };
> +
>  static int vk_h264_fill_pict(AVCodecContext *avctx, H264Picture **ref_src,
>  VkVideoReferenceSlotInfoKHR *ref_slot,       /* Main structure */
>  VkVideoPictureResourceInfoKHR *ref,          /* Goes in ^ */
> @@ -147,7 +149,7 @@ static void set_sps(const SPS *sps,
>  STD_VIDEO_H264_SCALING_LIST_4X4_NUM_ELEMENTS * sizeof(**sps->scaling_matrix4));
>  
>  for (int i = 0; i < STD_VIDEO_H264_SCALING_LIST_8X8_NUM_LISTS; i++)
> -        memcpy(vksps_scaling->ScalingList8x8[i], sps->scaling_matrix8[i],
> +        memcpy(vksps_scaling->ScalingList8x8[i], sps->scaling_matrix8[h264_scaling_list8_order[i]],
>  STD_VIDEO_H264_SCALING_LIST_8X8_NUM_ELEMENTS * sizeof(**sps->scaling_matrix8));
>  
>  *vksps_vui_header = (StdVideoH264HrdParameters) {
> @@ -252,7 +254,7 @@ static void set_pps(const PPS *pps, const SPS *sps,
>  STD_VIDEO_H264_SCALING_LIST_4X4_NUM_ELEMENTS * sizeof(**pps->scaling_matrix4));
>  
>  for (int i = 0; i < STD_VIDEO_H264_SCALING_LIST_8X8_NUM_LISTS; i++)
> -        memcpy(vkpps_scaling->ScalingList8x8[i], pps->scaling_matrix8[i],
> +        memcpy(vkpps_scaling->ScalingList8x8[i], pps->scaling_matrix8[h264_scaling_list8_order[i]],
>  STD_VIDEO_H264_SCALING_LIST_8X8_NUM_ELEMENTS * sizeof(**pps->scaling_matrix8));
>  
>  *vkpps = (StdVideoH264PictureParameterSet) {
> -- 
> 2.41.0
>

Thanks, pushed
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