Function ff_vk_decode_init

libavcodec/vulkan_decode.c:1291–1442

}

int ff_vk_decode_init(AVCodecContext *avctx)
{
    int err;
    FFVulkanDecodeContext *dec = avctx->internal->hwaccel_priv_data;
    FFVulkanDecodeShared *ctx;
    FFVulkanContext *s;
    int async_depth;
    const VkVideoProfileInfoKHR *profile;
    const FFVulkanDecodeDescriptor *vk_desc;

    VkVideoSessionCreateInfoKHR session_create = {
        .sType = VK_STRUCTURE_TYPE_VIDEO_SESSION_CREATE_INFO_KHR,
    };

    err = ff_decode_get_hw_frames_ctx(avctx, AV_HWDEVICE_TYPE_VULKAN);
    if (err < 0)
        return err;

    /* Initialize contexts */
    ctx = dec->shared_ctx;
    s = &ctx->s;

    err = ff_vk_init(s, avctx, NULL, avctx->hw_frames_ctx);
    if (err < 0)
        return err;

    vk_desc = get_codecdesc(avctx->codec_id);

    profile = get_video_profile(ctx, avctx->codec_id);
    if ((vk_desc->queue_flags & VK_QUEUE_VIDEO_DECODE_BIT_KHR) && !profile) {
        av_log(avctx, AV_LOG_ERROR, "Video profile missing from frames context!");
        return AVERROR(EINVAL);
    }

    /* Create queue context */
    vk_desc = get_codecdesc(avctx->codec_id);
    ctx->qf = ff_vk_qf_find(s, vk_desc->queue_flags, vk_desc->decode_op);
    if (!ctx->qf) {
        av_log(avctx, AV_LOG_ERROR, "Decoding of %s is not supported by this device\n",
               avcodec_get_name(avctx->codec_id));
        return err;
    }

    session_create.queueFamilyIndex = ctx->qf->idx;
    session_create.maxCodedExtent = ctx->caps.maxCodedExtent;
    session_create.maxDpbSlots = ctx->caps.maxDpbSlots;
    session_create.maxActiveReferencePictures = ctx->caps.maxActiveReferencePictures;
    session_create.pictureFormat = s->hwfc->format[0];
    session_create.referencePictureFormat = session_create.pictureFormat;
    session_create.pStdHeaderVersion = &vk_desc->ext_props;
    session_create.pVideoProfile = profile;
#ifdef VK_KHR_video_maintenance2
    if (ctx->s.extensions & FF_VK_EXT_VIDEO_MAINTENANCE_2)
        session_create.flags = VK_VIDEO_SESSION_CREATE_INLINE_SESSION_PARAMETERS_BIT_KHR;
#endif

    /* Create decode exec context for this specific main thread.
     * 2 async contexts per thread was experimentally determined to be optimal