/**************************************************************************
 *
 * Copyright 2010 Thomas Balling Sørensen.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 **************************************************************************/

#include "util/u_memory.h"
#include "util/u_math.h"
#include "util/u_debug.h"
#include "util/u_video.h"

#include "vl/vl_vlc.h"

#include "vdpau_private.h"

/**
 * Create a VdpDecoder.
 */
VdpStatus
vlVdpDecoderCreate(VdpDevice device,
                   VdpDecoderProfile profile,
                   uint32_t width, uint32_t height,
                   uint32_t max_references,
                   VdpDecoder *decoder)
{
   struct pipe_video_codec templat = {};
   struct pipe_context *pipe;
   struct pipe_screen *screen;
   vlVdpDevice *dev;
   vlVdpDecoder *vldecoder;
   VdpStatus ret;
   bool supported;
   uint32_t maxwidth, maxheight;

   if (!decoder)
      return VDP_STATUS_INVALID_POINTER;
   *decoder = 0;

   if (!(width && height))
      return VDP_STATUS_INVALID_VALUE;

   templat.profile = ProfileToPipe(profile);
   if (templat.profile == PIPE_VIDEO_PROFILE_UNKNOWN)
      return VDP_STATUS_INVALID_DECODER_PROFILE;

   dev = vlGetDataHTAB(device);
   if (!dev)
      return VDP_STATUS_INVALID_HANDLE;

   pipe = dev->context;
   screen = dev->vscreen->pscreen;

   pipe_mutex_lock(dev->mutex);

   supported = screen->get_video_param
   (
      screen,
      templat.profile,
      PIPE_VIDEO_ENTRYPOINT_BITSTREAM,
      PIPE_VIDEO_CAP_SUPPORTED
   );
   if (!supported) {
      pipe_mutex_unlock(dev->mutex);
      return VDP_STATUS_INVALID_DECODER_PROFILE;
   }

   maxwidth = screen->get_video_param
   (
      screen,
      templat.profile,
      PIPE_VIDEO_ENTRYPOINT_BITSTREAM,
      PIPE_VIDEO_CAP_MAX_WIDTH
   );
   maxheight = screen->get_video_param
   (
      screen,
      templat.profile,
      PIPE_VIDEO_ENTRYPOINT_BITSTREAM,
      PIPE_VIDEO_CAP_MAX_HEIGHT
   );
   if (width > maxwidth || height > maxheight) {
      pipe_mutex_unlock(dev->mutex);
      return VDP_STATUS_INVALID_SIZE;
   }

   vldecoder = CALLOC(1,sizeof(vlVdpDecoder));
   if (!vldecoder) {
      pipe_mutex_unlock(dev->mutex);
      return VDP_STATUS_RESOURCES;
   }

   DeviceReference(&vldecoder->device, dev);

   templat.entrypoint = PIPE_VIDEO_ENTRYPOINT_BITSTREAM;
   templat.chroma_format = PIPE_VIDEO_CHROMA_FORMAT_420;
   templat.width = width;
   templat.height = height;
   templat.max_references = max_references;

   if (u_reduce_video_profile(templat.profile) ==
       PIPE_VIDEO_FORMAT_MPEG4_AVC)
      templat.level = u_get_h264_level(templat.width, templat.height,
                            &templat.max_references);

   vldecoder->decoder = pipe->create_video_codec(pipe, &templat);

   if (!vldecoder->decoder) {
      ret = VDP_STATUS_ERROR;
      goto error_decoder;
   }

   *decoder = vlAddDataHTAB(vldecoder);
   if (*decoder == 0) {
      ret = VDP_STATUS_ERROR;
      goto error_handle;
   }

   pipe_mutex_init(vldecoder->mutex);
   pipe_mutex_unlock(dev->mutex);

   return VDP_STATUS_OK;

error_handle:
   vldecoder->decoder->destroy(vldecoder->decoder);

error_decoder:
   pipe_mutex_unlock(dev->mutex);
   DeviceReference(&vldecoder->device, NULL);
   FREE(vldecoder);
   return ret;
}

/**
 * Destroy a VdpDecoder.
 */
VdpStatus
vlVdpDecoderDestroy(VdpDecoder decoder)
{
   vlVdpDecoder *vldecoder;

   vldecoder = (vlVdpDecoder *)vlGetDataHTAB(decoder);
   if (!vldecoder)
      return VDP_STATUS_INVALID_HANDLE;

   pipe_mutex_lock(vldecoder->mutex);
   vldecoder->decoder->destroy(vldecoder->decoder);
   pipe_mutex_unlock(vldecoder->mutex);
   pipe_mutex_destroy(vldecoder->mutex);

   vlRemoveDataHTAB(decoder);
   DeviceReference(&vldecoder->device, NULL);
   FREE(vldecoder);

   return VDP_STATUS_OK;
}

/**
 * Retrieve the parameters used to create a VdpDecoder.
 */
VdpStatus
vlVdpDecoderGetParameters(VdpDecoder decoder,
                          VdpDecoderProfile *profile,
                          uint32_t *width,
                          uint32_t *height)
{
   vlVdpDecoder *vldecoder;

   vldecoder = (vlVdpDecoder *)vlGetDataHTAB(decoder);
   if (!vldecoder)
      return VDP_STATUS_INVALID_HANDLE;

   *profile = PipeToProfile(vldecoder->decoder->profile);
   *width = vldecoder->decoder->width;
   *height = vldecoder->decoder->height;

   return VDP_STATUS_OK;
}

static VdpStatus
vlVdpGetReferenceFrame(VdpVideoSurface handle, struct pipe_video_buffer **ref_frame)
{
   vlVdpSurface *surface;

   /* if surfaces equals VDP_STATUS_INVALID_HANDLE, they are not used */
   if (handle ==  VDP_INVALID_HANDLE) {
      *ref_frame = NULL;
      return VDP_STATUS_OK;
   }

   surface = vlGetDataHTAB(handle);
   if (!surface)
      return VDP_STATUS_INVALID_HANDLE;

   *ref_frame = surface->video_buffer;
   if (!*ref_frame)
         return VDP_STATUS_INVALID_HANDLE;

   return VDP_STATUS_OK;
}

/**
 * Decode a mpeg 1/2 video.
 */
static VdpStatus
vlVdpDecoderRenderMpeg12(struct pipe_mpeg12_picture_desc *picture,
                         VdpPictureInfoMPEG1Or2 *picture_info)
{
   VdpStatus r;

   VDPAU_MSG(VDPAU_TRACE, "[VDPAU] Decoding MPEG12\n");

   r = vlVdpGetReferenceFrame(picture_info->forward_reference, &picture->ref[0]);
   if (r != VDP_STATUS_OK)
      return r;

   r = vlVdpGetReferenceFrame(picture_info->backward_reference, &picture->ref[1]);
   if (r != VDP_STATUS_OK)
      return r;

   picture->picture_coding_type = picture_info->picture_coding_type;
   picture->picture_structure = picture_info->picture_structure;
   picture->frame_pred_frame_dct = picture_info->frame_pred_frame_dct;
   picture->q_scale_type = picture_info->q_scale_type;
   picture->alternate_scan = picture_info->alternate_scan;
   picture->intra_vlc_format = picture_info->intra_vlc_format;
   picture->concealment_motion_vectors = picture_info->concealment_motion_vectors;
   picture->intra_dc_precision = picture_info->intra_dc_precision;
   picture->f_code[0][0] = picture_info->f_code[0][0] - 1;
   picture->f_code[0][1] = picture_info->f_code[0][1] - 1;
   picture->f_code[1][0] = picture_info->f_code[1][0] - 1;
   picture->f_code[1][1] = picture_info->f_code[1][1] - 1;
   picture->num_slices = picture_info->slice_count;
   picture->top_field_first = picture_info->top_field_first;
   picture->full_pel_forward_vector = picture_info->full_pel_forward_vector;
   picture->full_pel_backward_vector = picture_info->full_pel_backward_vector;
   picture->intra_matrix = picture_info->intra_quantizer_matrix;
   picture->non_intra_matrix = picture_info->non_intra_quantizer_matrix;

   return VDP_STATUS_OK;
}

/**
 * Decode a mpeg 4 video.
 */
static VdpStatus
vlVdpDecoderRenderMpeg4(struct pipe_mpeg4_picture_desc *picture,
                        VdpPictureInfoMPEG4Part2 *picture_info)
{
   VdpStatus r;
   unsigned i;

   VDPAU_MSG(VDPAU_TRACE, "[VDPAU] Decoding MPEG4\n");

   r = vlVdpGetReferenceFrame(picture_info->forward_reference, &picture->ref[0]);
   if (r != VDP_STATUS_OK)
      return r;

   r = vlVdpGetReferenceFrame(picture_info->backward_reference, &picture->ref[1]);
   if (r != VDP_STATUS_OK)
      return r;

   for (i = 0; i < 2; ++i) {
      picture->trd[i] = picture_info->trd[i];
      picture->trb[i] = picture_info->trb[i];
   }
   picture->vop_time_increment_resolution = picture_info->vop_time_increment_resolution;
   picture->vop_coding_type = picture_info->vop_coding_type;
   picture->vop_fcode_forward = picture_info->vop_fcode_forward;
   picture->vop_fcode_backward = picture_info->vop_fcode_backward;
   picture->resync_marker_disable = picture_info->resync_marker_disable;
   picture->interlaced = picture_info->interlaced;
   picture->quant_type = picture_info->quant_type;
   picture->quarter_sample = picture_info->quarter_sample;
   picture->short_video_header = picture_info->short_video_header;
   picture->rounding_control = picture_info->rounding_control;
   picture->alternate_vertical_scan_flag = picture_info->alternate_vertical_scan_flag;
   picture->top_field_first = picture_info->top_field_first;
   picture->intra_matrix = picture_info->intra_quantizer_matrix;
   picture->non_intra_matrix = picture_info->non_intra_quantizer_matrix;

   return VDP_STATUS_OK;
}

static VdpStatus
vlVdpDecoderRenderVC1(struct pipe_vc1_picture_desc *picture,
                      VdpPictureInfoVC1 *picture_info)
{
   VdpStatus r;

   VDPAU_MSG(VDPAU_TRACE, "[VDPAU] Decoding VC-1\n");

   r = vlVdpGetReferenceFrame(picture_info->forward_reference, &picture->ref[0]);
   if (r != VDP_STATUS_OK)
      return r;

   r = vlVdpGetReferenceFrame(picture_info->backward_reference, &picture->ref[1]);
   if (r != VDP_STATUS_OK)
      return r;

   picture->slice_count = picture_info->slice_count;
   picture->picture_type = picture_info->picture_type;
   picture->frame_coding_mode = picture_info->frame_coding_mode;
   picture->postprocflag = picture_info->postprocflag;
   picture->pulldown = picture_info->pulldown;
   picture->interlace = picture_info->interlace;
   picture->tfcntrflag = picture_info->tfcntrflag;
   picture->finterpflag = picture_info->finterpflag;
   picture->psf = picture_info->psf;
   picture->dquant = picture_info->dquant;
   picture->panscan_flag = picture_info->panscan_flag;
   picture->refdist_flag = picture_info->refdist_flag;
   picture->quantizer = picture_info->quantizer;
   picture->extended_mv = picture_info->extended_mv;
   picture->extended_dmv = picture_info->extended_dmv;
   picture->overlap = picture_info->overlap;
   picture->vstransform = picture_info->vstransform;
   picture->loopfilter = picture_info->loopfilter;
   picture->fastuvmc = picture_info->fastuvmc;
   picture->range_mapy_flag = picture_info->range_mapy_flag;
   picture->range_mapy = picture_info->range_mapy;
   picture->range_mapuv_flag = picture_info->range_mapuv_flag;
   picture->range_mapuv = picture_info->range_mapuv;
   picture->multires = picture_info->multires;
   picture->syncmarker = picture_info->syncmarker;
   picture->rangered = picture_info->rangered;
   picture->maxbframes = picture_info->maxbframes;
   picture->deblockEnable = picture_info->deblockEnable;
   picture->pquant = picture_info->pquant;

   return VDP_STATUS_OK;
}

static VdpStatus
vlVdpDecoderRenderH264(struct pipe_h264_picture_desc *picture,
                       VdpPictureInfoH264 *picture_info)
{
   unsigned i;

   VDPAU_MSG(VDPAU_TRACE, "[VDPAU] Decoding H264\n");

   picture->pps->sps->mb_adaptive_frame_field_flag = picture_info->mb_adaptive_frame_field_flag;
   picture->pps->sps->frame_mbs_only_flag = picture_info->frame_mbs_only_flag;
   picture->pps->sps->log2_max_frame_num_minus4 = picture_info->log2_max_frame_num_minus4;
   picture->pps->sps->pic_order_cnt_type = picture_info->pic_order_cnt_type;
   picture->pps->sps->log2_max_pic_order_cnt_lsb_minus4 = picture_info->log2_max_pic_order_cnt_lsb_minus4;
   picture->pps->sps->delta_pic_order_always_zero_flag = picture_info->delta_pic_order_always_zero_flag;
   picture->pps->sps->direct_8x8_inference_flag = picture_info->direct_8x8_inference_flag;

   picture->pps->transform_8x8_mode_flag = picture_info->transform_8x8_mode_flag;
   picture->pps->chroma_qp_index_offset = picture_info->chroma_qp_index_offset;
   picture->pps->second_chroma_qp_index_offset = picture_info->second_chroma_qp_index_offset;
   picture->pps->pic_init_qp_minus26 = picture_info->pic_init_qp_minus26;
   picture->pps->entropy_coding_mode_flag = picture_info->entropy_coding_mode_flag;
   picture->pps->deblocking_filter_control_present_flag = picture_info->deblocking_filter_control_present_flag;
   picture->pps->redundant_pic_cnt_present_flag = picture_info->redundant_pic_cnt_present_flag;
   picture->pps->constrained_intra_pred_flag = picture_info->constrained_intra_pred_flag;
   picture->pps->weighted_pred_flag = picture_info->weighted_pred_flag;
   picture->pps->weighted_bipred_idc = picture_info->weighted_bipred_idc;
   picture->pps->bottom_field_pic_order_in_frame_present_flag = picture_info->pic_order_present_flag;
   memcpy(picture->pps->ScalingList4x4, picture_info->scaling_lists_4x4, 6*16);
   memcpy(picture->pps->ScalingList8x8, picture_info->scaling_lists_8x8, 2*64);

   picture->slice_count = picture_info->slice_count;
   picture->field_order_cnt[0] = picture_info->field_order_cnt[0];
   picture->field_order_cnt[1] = picture_info->field_order_cnt[1];
   picture->is_reference = picture_info->is_reference;
   picture->frame_num = picture_info->frame_num;
   picture->field_pic_flag = picture_info->field_pic_flag;
   picture->bottom_field_flag = picture_info->bottom_field_flag;
   picture->num_ref_frames = picture_info->num_ref_frames;

   picture->num_ref_idx_l0_active_minus1 = picture_info->num_ref_idx_l0_active_minus1;
   picture->num_ref_idx_l1_active_minus1 = picture_info->num_ref_idx_l1_active_minus1;

   for (i = 0; i < 16; ++i) {
      VdpStatus ret = vlVdpGetReferenceFrame
      (
         picture_info->referenceFrames[i].surface,
         &picture->ref[i]
      );
      if (ret != VDP_STATUS_OK)
         return ret;

      picture->is_long_term[i] = picture_info->referenceFrames[i].is_long_term;
      picture->top_is_reference[i] = picture_info->referenceFrames[i].top_is_reference;
      picture->bottom_is_reference[i] = picture_info->referenceFrames[i].bottom_is_reference;
      picture->field_order_cnt_list[i][0] = picture_info->referenceFrames[i].field_order_cnt[0];
      picture->field_order_cnt_list[i][1] = picture_info->referenceFrames[i].field_order_cnt[1];
      picture->frame_num_list[i] = picture_info->referenceFrames[i].frame_idx;
   }

   return VDP_STATUS_OK;
}

static VdpStatus
vlVdpDecoderRenderH265(struct pipe_h265_picture_desc *picture,
                       VdpPictureInfoHEVC *picture_info)
{
   unsigned i;

   picture->pps->sps->chroma_format_idc = picture_info->chroma_format_idc;
   picture->pps->sps->separate_colour_plane_flag = picture_info->separate_colour_plane_flag;
   picture->pps->sps->pic_width_in_luma_samples = picture_info->pic_width_in_luma_samples;
   picture->pps->sps->pic_height_in_luma_samples = picture_info->pic_height_in_luma_samples;
   picture->pps->sps->bit_depth_luma_minus8 = picture_info->bit_depth_luma_minus8;
   picture->pps->sps->bit_depth_chroma_minus8 = picture_info->bit_depth_chroma_minus8;
   picture->pps->sps->log2_max_pic_order_cnt_lsb_minus4 = picture_info->log2_max_pic_order_cnt_lsb_minus4;
   picture->pps->sps->sps_max_dec_pic_buffering_minus1 = picture_info->sps_max_dec_pic_buffering_minus1;
   picture->pps->sps->log2_min_luma_coding_block_size_minus3 = picture_info->log2_min_luma_coding_block_size_minus3;
   picture->pps->sps->log2_diff_max_min_luma_coding_block_size = picture_info->log2_diff_max_min_luma_coding_block_size;
   picture->pps->sps->log2_min_transform_block_size_minus2 = picture_info->log2_min_transform_block_size_minus2;
   picture->pps->sps->log2_diff_max_min_transform_block_size = picture_info->log2_diff_max_min_transform_block_size;
   picture->pps->sps->max_transform_hierarchy_depth_inter = picture_info->max_transform_hierarchy_depth_inter;
   picture->pps->sps->max_transform_hierarchy_depth_intra = picture_info->max_transform_hierarchy_depth_intra;
   picture->pps->sps->scaling_list_enabled_flag = picture_info->scaling_list_enabled_flag;
   memcpy(picture->pps->sps->ScalingList4x4, picture_info->ScalingList4x4, 6*16);
   memcpy(picture->pps->sps->ScalingList8x8, picture_info->ScalingList8x8, 6*64);
   memcpy(picture->pps->sps->ScalingList16x16, picture_info->ScalingList16x16, 6*64);
   memcpy(picture->pps->sps->ScalingList32x32, picture_info->ScalingList32x32, 2*64);
   memcpy(picture->pps->sps->ScalingListDCCoeff16x16, picture_info->ScalingListDCCoeff16x16, 6);
   memcpy(picture->pps->sps->ScalingListDCCoeff32x32, picture_info->ScalingListDCCoeff32x32, 2);
   picture->pps->sps->amp_enabled_flag = picture_info->amp_enabled_flag;
   picture->pps->sps->sample_adaptive_offset_enabled_flag = picture_info->sample_adaptive_offset_enabled_flag;
   picture->pps->sps->pcm_enabled_flag = picture_info->pcm_enabled_flag;
   picture->pps->sps->pcm_sample_bit_depth_luma_minus1 = picture_info->pcm_sample_bit_depth_luma_minus1;
   picture->pps->sps->pcm_sample_bit_depth_chroma_minus1 = picture_info->pcm_sample_bit_depth_chroma_minus1;
   picture->pps->sps->log2_min_pcm_luma_coding_block_size_minus3 = picture_info->log2_min_pcm_luma_coding_block_size_minus3;
   picture->pps->sps->log2_diff_max_min_pcm_luma_coding_block_size = picture_info->log2_diff_max_min_pcm_luma_coding_block_size;
   picture->pps->sps->pcm_loop_filter_disabled_flag = picture_info->pcm_loop_filter_disabled_flag;
   picture->pps->sps->num_short_term_ref_pic_sets = picture_info->num_short_term_ref_pic_sets;
   picture->pps->sps->long_term_ref_pics_present_flag = picture_info->long_term_ref_pics_present_flag;
   picture->pps->sps->num_long_term_ref_pics_sps = picture_info->num_long_term_ref_pics_sps;
   picture->pps->sps->sps_temporal_mvp_enabled_flag = picture_info->sps_temporal_mvp_enabled_flag;
   picture->pps->sps->strong_intra_smoothing_enabled_flag = picture_info->strong_intra_smoothing_enabled_flag;

   picture->pps->dependent_slice_segments_enabled_flag = picture_info->dependent_slice_segments_enabled_flag;
   picture->pps->output_flag_present_flag = picture_info->output_flag_present_flag;
   picture->pps->num_extra_slice_header_bits = picture_info->num_extra_slice_header_bits;
   picture->pps->sign_data_hiding_enabled_flag = picture_info->sign_data_hiding_enabled_flag;
   picture->pps->cabac_init_present_flag = picture_info->cabac_init_present_flag;
   picture->pps->num_ref_idx_l0_default_active_minus1 = picture_info->num_ref_idx_l0_default_active_minus1;
   picture->pps->num_ref_idx_l1_default_active_minus1 = picture_info->num_ref_idx_l1_default_active_minus1;
   picture->pps->init_qp_minus26 = picture_info->init_qp_minus26;
   picture->pps->constrained_intra_pred_flag = picture_info->constrained_intra_pred_flag;
   picture->pps->transform_skip_enabled_flag = picture_info->transform_skip_enabled_flag;
   picture->pps->cu_qp_delta_enabled_flag = picture_info->cu_qp_delta_enabled_flag;
   picture->pps->diff_cu_qp_delta_depth = picture_info->diff_cu_qp_delta_depth;
   picture->pps->pps_cb_qp_offset = picture_info->pps_cb_qp_offset;
   picture->pps->pps_cr_qp_offset = picture_info->pps_cr_qp_offset;
   picture->pps->pps_slice_chroma_qp_offsets_present_flag = picture_info->pps_slice_chroma_qp_offsets_present_flag;
   picture->pps->weighted_pred_flag = picture_info->weighted_pred_flag;
   picture->pps->weighted_bipred_flag = picture_info->weighted_bipred_flag;
   picture->pps->transquant_bypass_enabled_flag = picture_info->transquant_bypass_enabled_flag;
   picture->pps->tiles_enabled_flag = picture_info->tiles_enabled_flag;
   picture->pps->entropy_coding_sync_enabled_flag = picture_info->entropy_coding_sync_enabled_flag;
   picture->pps->num_tile_columns_minus1 = picture_info->num_tile_columns_minus1;
   picture->pps->num_tile_rows_minus1 = picture_info->num_tile_rows_minus1;
   picture->pps->uniform_spacing_flag = picture_info->uniform_spacing_flag;
   memcpy(picture->pps->column_width_minus1, picture_info->column_width_minus1, 20 * 2);
   memcpy(picture->pps->row_height_minus1, picture_info->row_height_minus1, 22 * 2);
   picture->pps->loop_filter_across_tiles_enabled_flag = picture_info->loop_filter_across_tiles_enabled_flag;
   picture->pps->pps_loop_filter_across_slices_enabled_flag = picture_info->pps_loop_filter_across_slices_enabled_flag;
   picture->pps->deblocking_filter_control_present_flag = picture_info->deblocking_filter_control_present_flag;
   picture->pps->deblocking_filter_override_enabled_flag = picture_info->deblocking_filter_override_enabled_flag;
   picture->pps->pps_deblocking_filter_disabled_flag = picture_info->pps_deblocking_filter_disabled_flag;
   picture->pps->pps_beta_offset_div2 = picture_info->pps_beta_offset_div2;
   picture->pps->pps_tc_offset_div2 = picture_info->pps_tc_offset_div2;
   picture->pps->lists_modification_present_flag = picture_info->lists_modification_present_flag;
   picture->pps->log2_parallel_merge_level_minus2 = picture_info->log2_parallel_merge_level_minus2;
   picture->pps->slice_segment_header_extension_present_flag = picture_info->slice_segment_header_extension_present_flag;

   picture->IDRPicFlag = picture_info->IDRPicFlag;
   picture->RAPPicFlag = picture_info->RAPPicFlag;
   picture->CurrRpsIdx = picture_info->CurrRpsIdx;
   picture->NumPocTotalCurr = picture_info->NumPocTotalCurr;
   picture->NumDeltaPocsOfRefRpsIdx = picture_info->NumDeltaPocsOfRefRpsIdx;
   picture->NumShortTermPictureSliceHeaderBits = picture_info->NumShortTermPictureSliceHeaderBits;
   picture->NumLongTermPictureSliceHeaderBits = picture_info->NumLongTermPictureSliceHeaderBits;
   picture->CurrPicOrderCntVal = picture_info->CurrPicOrderCntVal;

   for (i = 0; i < 16; ++i) {
      VdpStatus ret = vlVdpGetReferenceFrame
      (
         picture_info->RefPics[i],
         &picture->ref[i]
      );
      if (ret != VDP_STATUS_OK)
         return ret;

      picture->PicOrderCntVal[i] = picture_info->PicOrderCntVal[i];
      picture->IsLongTerm[i] = picture_info->IsLongTerm[i];
   }

   picture->NumPocStCurrBefore = picture_info->NumPocStCurrBefore;
   picture->NumPocStCurrAfter = picture_info->NumPocStCurrAfter;
   picture->NumPocLtCurr = picture_info->NumPocLtCurr;
   memcpy(picture->RefPicSetStCurrBefore, picture_info->RefPicSetStCurrBefore, 8);
   memcpy(picture->RefPicSetStCurrAfter, picture_info->RefPicSetStCurrAfter, 8);
   memcpy(picture->RefPicSetLtCurr, picture_info->RefPicSetLtCurr, 8);
   picture->UseRefPicList = false;

   return VDP_STATUS_OK;
}

static void
vlVdpDecoderFixVC1Startcode(uint32_t *num_buffers, const void *buffers[], unsigned sizes[])
{
   static const uint8_t vc1_startcode[] = { 0x00, 0x00, 0x01, 0x0D };
   struct vl_vlc vlc;
   unsigned i;

   /* search the first 64 bytes for a startcode */
   vl_vlc_init(&vlc, *num_buffers, buffers, sizes);
   while (vl_vlc_search_byte(&vlc, 64*8, 0x00) && vl_vlc_bits_left(&vlc) >= 32) {
      uint32_t value = vl_vlc_peekbits(&vlc, 32);
      if (value == 0x0000010D ||
          value == 0x0000010C ||
          value == 0x0000010B)
         return;
      vl_vlc_eatbits(&vlc, 8);
   }

   /* none found, ok add one manually */
   VDPAU_MSG(VDPAU_TRACE, "[VDPAU] Manually adding VC-1 startcode\n");
   for (i = *num_buffers; i > 0; --i) {
      buffers[i] = buffers[i - 1];
      sizes[i] = sizes[i - 1];
   }
   ++(*num_buffers);
   buffers[0] = vc1_startcode;
   sizes[0] = 4;
}

/**
 * Decode a compressed field/frame and render the result into a VdpVideoSurface.
 */
VdpStatus
vlVdpDecoderRender(VdpDecoder decoder,
                   VdpVideoSurface target,
                   VdpPictureInfo const *picture_info,
                   uint32_t bitstream_buffer_count,
                   VdpBitstreamBuffer const *bitstream_buffers)
{
   const void * buffers[bitstream_buffer_count + 1];
   unsigned sizes[bitstream_buffer_count + 1];
   vlVdpDecoder *vldecoder;
   vlVdpSurface *vlsurf;
   VdpStatus ret;
   struct pipe_screen *screen;
   struct pipe_video_codec *dec;
   bool buffer_support[2];
   unsigned i;
   struct pipe_h264_sps sps_h264 = {};
   struct pipe_h264_pps pps_h264 = { &sps_h264 };
   struct pipe_h265_sps sps_h265 = {};
   struct pipe_h265_pps pps_h265 = { &sps_h265 };
   union {
      struct pipe_picture_desc base;
      struct pipe_mpeg12_picture_desc mpeg12;
      struct pipe_mpeg4_picture_desc mpeg4;
      struct pipe_vc1_picture_desc vc1;
      struct pipe_h264_picture_desc h264;
      struct pipe_h265_picture_desc h265;
   } desc;

   if (!(picture_info && bitstream_buffers))
      return VDP_STATUS_INVALID_POINTER;

   vldecoder = (vlVdpDecoder *)vlGetDataHTAB(decoder);
   if (!vldecoder)
      return VDP_STATUS_INVALID_HANDLE;
   dec = vldecoder->decoder;
   screen = dec->context->screen;

   vlsurf = (vlVdpSurface *)vlGetDataHTAB(target);
   if (!vlsurf)
      return VDP_STATUS_INVALID_HANDLE;

   if (vlsurf->device != vldecoder->device)
      return VDP_STATUS_HANDLE_DEVICE_MISMATCH;

   if (vlsurf->video_buffer != NULL && vlsurf->video_buffer->chroma_format != dec->chroma_format)
      // TODO: Recreate decoder with correct chroma
      return VDP_STATUS_INVALID_CHROMA_TYPE;

   buffer_support[0] = screen->get_video_param(screen, dec->profile, PIPE_VIDEO_ENTRYPOINT_BITSTREAM,
                                               PIPE_VIDEO_CAP_SUPPORTS_PROGRESSIVE);
   buffer_support[1] = screen->get_video_param(screen, dec->profile, PIPE_VIDEO_ENTRYPOINT_BITSTREAM,
                                               PIPE_VIDEO_CAP_SUPPORTS_INTERLACED);

   if (vlsurf->video_buffer == NULL ||
       !screen->is_video_format_supported(screen, vlsurf->video_buffer->buffer_format,
                                          dec->profile, PIPE_VIDEO_ENTRYPOINT_BITSTREAM) ||
       !buffer_support[vlsurf->video_buffer->interlaced]) {

      pipe_mutex_lock(vlsurf->device->mutex);

      /* destroy the old one */
      if (vlsurf->video_buffer)
         vlsurf->video_buffer->destroy(vlsurf->video_buffer);

      /* set the buffer format to the prefered one */
      vlsurf->templat.buffer_format = screen->get_video_param(screen, dec->profile, PIPE_VIDEO_ENTRYPOINT_BITSTREAM,
                                                              PIPE_VIDEO_CAP_PREFERED_FORMAT);

      /* also set interlacing to decoders preferences */
      vlsurf->templat.interlaced = screen->get_video_param(screen, dec->profile, PIPE_VIDEO_ENTRYPOINT_BITSTREAM,
                                                           PIPE_VIDEO_CAP_PREFERS_INTERLACED);

      /* and recreate the video buffer */
      vlsurf->video_buffer = dec->context->create_video_buffer(dec->context, &vlsurf->templat);

      /* still no luck? get me out of here... */
      if (!vlsurf->video_buffer) {
         pipe_mutex_unlock(vlsurf->device->mutex);
         return VDP_STATUS_NO_IMPLEMENTATION;
      }
      vlVdpVideoSurfaceClear(vlsurf);
      pipe_mutex_unlock(vlsurf->device->mutex);
   }

   for (i = 0; i < bitstream_buffer_count; ++i) {
      buffers[i] = bitstream_buffers[i].bitstream;
      sizes[i] = bitstream_buffers[i].bitstream_bytes;
   }

   memset(&desc, 0, sizeof(desc));
   desc.base.profile = dec->profile;
   switch (u_reduce_video_profile(dec->profile)) {
   case PIPE_VIDEO_FORMAT_MPEG12:
      ret = vlVdpDecoderRenderMpeg12(&desc.mpeg12, (VdpPictureInfoMPEG1Or2 *)picture_info);
      break;
   case PIPE_VIDEO_FORMAT_MPEG4:
      ret = vlVdpDecoderRenderMpeg4(&desc.mpeg4, (VdpPictureInfoMPEG4Part2 *)picture_info);
      break;
   case PIPE_VIDEO_FORMAT_VC1:
      if (dec->profile == PIPE_VIDEO_PROFILE_VC1_ADVANCED)
         vlVdpDecoderFixVC1Startcode(&bitstream_buffer_count, buffers, sizes);
      ret = vlVdpDecoderRenderVC1(&desc.vc1, (VdpPictureInfoVC1 *)picture_info);
      break;
   case PIPE_VIDEO_FORMAT_MPEG4_AVC:
      desc.h264.pps = &pps_h264;
      ret = vlVdpDecoderRenderH264(&desc.h264, (VdpPictureInfoH264 *)picture_info);
      break;
   case PIPE_VIDEO_FORMAT_HEVC:
      desc.h265.pps = &pps_h265;
      ret = vlVdpDecoderRenderH265(&desc.h265, (VdpPictureInfoHEVC *)picture_info);
      break;
   default:
      return VDP_STATUS_INVALID_DECODER_PROFILE;
   }

   if (ret != VDP_STATUS_OK)
      return ret;

   pipe_mutex_lock(vldecoder->mutex);
   dec->begin_frame(dec, vlsurf->video_buffer, &desc.base);
   dec->decode_bitstream(dec, vlsurf->video_buffer, &desc.base, bitstream_buffer_count, buffers, sizes);
   dec->end_frame(dec, vlsurf->video_buffer, &desc.base);
   pipe_mutex_unlock(vldecoder->mutex);
   return ret;
}
