/*
 INTEL CONFIDENTIAL
 Copyright 2009 Intel Corporation All Rights Reserved.
 The source code contained or described herein and all documents related to the source code ("Material") are owned by Intel Corporation or its suppliers or licensors. Title to the Material remains with Intel Corporation or its suppliers and licensors. The Material contains trade secrets and proprietary and confidential information of Intel or its suppliers and licensors. The Material is protected by worldwide copyright and trade secret laws and treaty provisions. No part of the Material may be used, copied, reproduced, modified, published, uploaded, posted, transmitted, distributed, or disclosed in any way without Intel’s prior express written permission.

 No license under any patent, copyright, trade secret or other intellectual property right is granted to or conferred upon you by disclosure or delivery of the Materials, either expressly, by implication, inducement, estoppel or otherwise. Any license under such intellectual property rights must be express and approved by Intel in writing.
 */

#ifdef ANDROID
#define true 1
#define false 0
#endif


#include <glib.h>
#include <dlfcn.h>

#include "h264.h"
#include "vbp_loader.h"
#include "vbp_utils.h"
#include "vbp_h264_parser.h"


typedef enum
{
    H264_BS_LENGTH_PREFIXED,
    H264_BS_SC_PREFIXED,
    H264_BS_SINGLE_NAL
} H264_BS_PATTERN;

/* number of bytes used to encode length of NAL payload.  If parser does not receive configuration data
and NAL_length_size is equal to zero when bitstream parsing begins, we assume bitstream is in AnnexB
byte stream format. */
static int NAL_length_size = 0;

/* indicate if stream is length prefixed */
static int length_prefix_verified = 0;

static H264_BS_PATTERN bitstream_pattern = H264_BS_SC_PREFIXED;


/* default scaling list table */
unsigned char Default_4x4_Intra[16] =
{     
    6,13,20,28,
    13,20,28,32,
    20,28,32,37,
    28,32,37,42
};

unsigned char Default_4x4_Inter[16] =
{   
    10,14,20,24,
    14,20,24,27,
    20,24,27,30,
    24,27,30,34
};

unsigned char Default_8x8_Intra[64] =
{   
    6,10,13,16,18,23,25,27,
    10,11,16,18,23,25,27,29,
    13,16,18,23,25,27,29,31,
    16,18,23,25,27,29,31,33,
    18,23,25,27,29,31,33,36,
    23,25,27,29,31,33,36,38,
    25,27,29,31,33,36,38,40,
    27,29,31,33,36,38,40,42
};

unsigned char Default_8x8_Inter[64] =
{
    9,13,15,17,19,21,22,24,
    13,13,17,19,21,22,24,25,
    15,17,19,21,22,24,25,27,
    17,19,21,22,24,25,27,28,
    19,21,22,24,25,27,28,30,
    21,22,24,25,27,28,30,32,
    22,24,25,27,28,30,32,33,
    24,25,27,28,30,32,33,35
};

unsigned char quant_flat[16] = 
{
    16,16,16,16,
    16,16,16,16,
    16,16,16,16,
    16,16,16,16
};

unsigned char quant8_flat[64] =
{ 
    16,16,16,16,16,16,16,16,
    16,16,16,16,16,16,16,16,
    16,16,16,16,16,16,16,16,
    16,16,16,16,16,16,16,16,
    16,16,16,16,16,16,16,16,
    16,16,16,16,16,16,16,16,
    16,16,16,16,16,16,16,16,
    16,16,16,16,16,16,16,16
};

unsigned char* UseDefaultList[8] = 
{
    Default_4x4_Intra, Default_4x4_Intra, Default_4x4_Intra,
    Default_4x4_Inter, Default_4x4_Inter, Default_4x4_Inter,
    Default_8x8_Intra,
    Default_8x8_Inter
};

/**
 *
 */
uint32 vbp_init_parser_entries_h264(vbp_context *pcontext)
{
 	if (NULL == pcontext->parser_ops)
	{
		return VBP_PARM;
	}
	pcontext->parser_ops->init = dlsym(pcontext->fd_parser, "viddec_h264_init");
	if (NULL == pcontext->parser_ops->init)
	{
		ETRACE ("Failed to set entry point." );
		return VBP_LOAD;
	}

	pcontext->parser_ops->parse_sc = viddec_parse_sc;

	pcontext->parser_ops->parse_syntax = dlsym(pcontext->fd_parser, "viddec_h264_parse");
	if (NULL == pcontext->parser_ops->parse_syntax)
	{
		ETRACE ("Failed to set entry point." );
		return VBP_LOAD;
	}

	pcontext->parser_ops->get_cxt_size = dlsym(pcontext->fd_parser, "viddec_h264_get_context_size");
	if (NULL == pcontext->parser_ops->get_cxt_size)
	{
		ETRACE ("Failed to set entry point." );
		return VBP_LOAD;
	}

	pcontext->parser_ops->is_wkld_done = dlsym(pcontext->fd_parser, "viddec_h264_wkld_done");
	if (NULL == pcontext->parser_ops->is_wkld_done)
	{
		ETRACE ("Failed to set entry point." );
		return VBP_LOAD;
	}

	/* entry point not needed */
	pcontext->parser_ops->is_frame_start = NULL;
	return VBP_OK;
}


/**
 *
 */
uint32 vbp_allocate_query_data_h264(vbp_context *pcontext)
{
	if (NULL != pcontext->query_data)
	{
		return VBP_PARM;
	}

	pcontext->query_data = NULL;
	vbp_data_h264 *query_data = NULL;

	query_data = g_try_new0(vbp_data_h264, 1);
	if (NULL == query_data)
	{
		goto cleanup;
	}

	/* assign the pointer */
	pcontext->query_data = (void *)query_data;

	query_data->pic_data = g_try_new0(vbp_picture_data_h264, MAX_NUM_PICTURES);
	if (NULL == query_data->pic_data)
	{
		goto cleanup;
	}

	int i;
	for (i = 0; i < MAX_NUM_PICTURES; i++)
	{
		query_data->pic_data[i].pic_parms = g_try_new0(VAPictureParameterBufferH264, 1);
		if (NULL == query_data->pic_data[i].pic_parms)
		{
			goto cleanup;
		} 
		query_data->pic_data[i].num_slices = 0;
		query_data->pic_data[i].slc_data = g_try_new0(vbp_slice_data_h264, MAX_NUM_SLICES);
		if (NULL == query_data->pic_data[i].slc_data)
		{
			goto cleanup;
		}    
	}


	query_data->IQ_matrix_buf = g_try_new0(VAIQMatrixBufferH264, 1);
	if (NULL == query_data->IQ_matrix_buf)
	{
		goto cleanup;
	}

	query_data->codec_data = g_try_new0(vbp_codec_data_h264, 1);
	if (NULL == query_data->codec_data)
	{
		goto cleanup;
	}

	return VBP_OK;

cleanup:
	vbp_free_query_data_h264(pcontext);
	
	return VBP_MEM;
}

uint32 vbp_free_query_data_h264(vbp_context *pcontext)
{
	if (NULL == pcontext->query_data)
	{
		return VBP_OK;
	}

	int i;
	vbp_data_h264 *query_data;
	query_data = (vbp_data_h264 *)pcontext->query_data;

	if (query_data->pic_data)
	{
		for (i = 0; i < MAX_NUM_PICTURES; i++)
		{
			g_free(query_data->pic_data[i].slc_data);
			g_free(query_data->pic_data[i].pic_parms);
		}
		g_free(query_data->pic_data);
	}

	g_free(query_data->IQ_matrix_buf);
	g_free(query_data->codec_data);
	g_free(query_data);

	pcontext->query_data = NULL;

    NAL_length_size = 0;
    length_prefix_verified = 0;
    bitstream_pattern = H264_BS_SC_PREFIXED;

	return VBP_OK;
}


static inline uint16_t vbp_utils_ntohs(uint8_t* p)
{
	uint16_t i = ((*p) << 8) + ((*(p+1)));
	return i; 	           
}

static inline uint32_t vbp_utils_ntohl(uint8_t* p)
{
	uint32_t i = ((*p) << 24) + ((*(p+1)) << 16) + ((*(p+2)) << 8) + ((*(p+3)));
	return i; 	           
}


static inline void vbp_set_VAPicture_h264(
	int curr_picture_structure,
	int bottom_field,	
	frame_store* store,
	VAPictureH264* pic)
{
	if (FRAME == curr_picture_structure)
	{
		if (FRAME != viddec_h264_get_dec_structure(store))
		{
			WTRACE("Reference picture structure is not frame for current frame picture!");
		}
		pic->flags = 0;
		pic->TopFieldOrderCnt = store->frame.poc;
		pic->BottomFieldOrderCnt = store->frame.poc;
	}
	else
	{
		if (FRAME == viddec_h264_get_dec_structure(store))
		{
			WTRACE("reference picture structure is frame for current field picture!");
		}		
		if (bottom_field)
		{
			pic->flags = VA_PICTURE_H264_BOTTOM_FIELD;
			pic->TopFieldOrderCnt = store->top_field.poc;
			pic->BottomFieldOrderCnt = store->bottom_field.poc;		
		}
		else
		{					
			pic->flags = VA_PICTURE_H264_TOP_FIELD;
			pic->TopFieldOrderCnt = store->top_field.poc;
			pic->BottomFieldOrderCnt = store->bottom_field.poc;
		}
	}
}

static inline void vbp_set_slice_ref_list_h264(
	struct h264_viddec_parser* h264_parser,
	VASliceParameterBufferH264 *slc_parms)
{	
	int i, j;
	int num_ref_idx_active = 0;
	h264_Slice_Header_t* slice_header = &(h264_parser->info.SliceHeader);
	uint8_t* p_list = NULL;
	VAPictureH264* refPicListX = NULL;
	frame_store* fs = NULL;

	/* initialize ref picutre list, set picture id and flags to invalid. */

	for (i = 0; i < 2; i++)
	{
		refPicListX = (i == 0) ? &(slc_parms->RefPicList0[0]) : &(slc_parms->RefPicList1[0]);
		for (j = 0; j < 32; j++)
    	{
	    	refPicListX->picture_id = VA_INVALID_SURFACE;
			refPicListX->frame_idx = 0;
	    	refPicListX->flags = VA_PICTURE_H264_INVALID;
			refPicListX->TopFieldOrderCnt = 0;
			refPicListX->BottomFieldOrderCnt = 0;
			refPicListX++;
		}
    }
    	
	for (i = 0; i < 2; i++)
	{
		refPicListX = (i == 0) ? &(slc_parms->RefPicList0[0]) : &(slc_parms->RefPicList1[0]);
		
  		if ((i == 0) && 
			((h264_PtypeB == slice_header->slice_type) ||
			(h264_PtypeP == slice_header->slice_type)))
   		{
       		num_ref_idx_active = slice_header->num_ref_idx_l0_active;
       		if (slice_header->sh_refpic_l0.ref_pic_list_reordering_flag)
       		{
       			p_list = h264_parser->info.slice_ref_list0;      
       		}
       		else
       		{
       			p_list = h264_parser->info.dpb.listX_0;
       		}
   		}
   		else if((i == 1) && (h264_PtypeB == slice_header->slice_type))   		
   		{
       		num_ref_idx_active = slice_header->num_ref_idx_l1_active;    
       		if (slice_header->sh_refpic_l1.ref_pic_list_reordering_flag)
       		{
       			p_list = h264_parser->info.slice_ref_list1;
         	}
         	else
         	{
            	p_list = h264_parser->info.dpb.listX_1;
         	}    
   		}
   		else
   		{
       	 	num_ref_idx_active = 0;
       		p_list = NULL;
      	}     
		
	
		for (j = 0; j < num_ref_idx_active; j++)
		{
			fs = &(h264_parser->info.dpb.fs[(p_list[j] & 0x1f)]);
			
			/* bit 5 indicates if reference picture is bottom field */
			vbp_set_VAPicture_h264(
				h264_parser->info.img.structure,
				(p_list[j] & 0x20) >> 5, 
				fs, 
				refPicListX);
							
			refPicListX->frame_idx = fs->frame_num;
			refPicListX->flags |= viddec_h264_get_is_long_term(fs) ? VA_PICTURE_H264_LONG_TERM_REFERENCE : VA_PICTURE_H264_SHORT_TERM_REFERENCE;
			refPicListX++;
		}
	}
}

static inline void vbp_set_pre_weight_table_h264(
	struct h264_viddec_parser* h264_parser,
	VASliceParameterBufferH264 *slc_parms)
{
	h264_Slice_Header_t* slice_header = &(h264_parser->info.SliceHeader);
	int i, j;

	if ((((h264_PtypeP == slice_header->slice_type) ||
    	(h264_PtypeB == slice_header->slice_type)) &&
    	h264_parser->info.active_PPS.weighted_pred_flag) ||
    	((h264_PtypeB == slice_header->slice_type) &&
    	(1 == h264_parser->info.active_PPS.weighted_bipred_idc)))
    {
     	slc_parms->luma_log2_weight_denom = slice_header->sh_predwttbl.luma_log2_weight_denom;
    	slc_parms->chroma_log2_weight_denom = slice_header->sh_predwttbl.chroma_log2_weight_denom;
   		slc_parms->luma_weight_l0_flag = slice_header->sh_predwttbl.luma_weight_l0_flag;
   		slc_parms->chroma_weight_l0_flag = slice_header->sh_predwttbl.chroma_weight_l0_flag;
		slc_parms->luma_weight_l1_flag = slice_header->sh_predwttbl.luma_weight_l1_flag;
   		slc_parms->chroma_weight_l1_flag = slice_header->sh_predwttbl.chroma_weight_l1_flag;
   		
   		for (i = 0; i < 32; i++)
   		{
   			slc_parms->luma_weight_l0[i] = 	slice_header->sh_predwttbl.luma_weight_l0[i];
   			slc_parms->luma_offset_l0[i] = 	slice_header->sh_predwttbl.luma_offset_l0[i];
   			slc_parms->luma_weight_l1[i] = 	slice_header->sh_predwttbl.luma_weight_l1[i];
   			slc_parms->luma_offset_l1[i] = 	slice_header->sh_predwttbl.luma_offset_l1[i];
   			
   			for (j = 0; j < 2; j++)
   			{
	   			slc_parms->chroma_weight_l0[i][j] = slice_header->sh_predwttbl.chroma_weight_l0[i][j];
	   			slc_parms->chroma_offset_l0[i][j] = slice_header->sh_predwttbl.chroma_offset_l0[i][j];
	   			slc_parms->chroma_weight_l1[i][j] = slice_header->sh_predwttbl.chroma_weight_l1[i][j];
	   			slc_parms->chroma_offset_l1[i][j] = slice_header->sh_predwttbl.chroma_offset_l1[i][j];
   			}   			
   		}
   	}
   	else
   	{
	   	/* default weight table */
    	slc_parms->luma_log2_weight_denom = 5;
    	slc_parms->chroma_log2_weight_denom = 5;
    	slc_parms->luma_weight_l0_flag = 0;
    	slc_parms->luma_weight_l1_flag = 0;
		slc_parms->chroma_weight_l0_flag = 0;
   		slc_parms->chroma_weight_l1_flag = 0;
    	for (i = 0; i < 32; i++)
    	{
    		slc_parms->luma_weight_l0[i] = 0;
    		slc_parms->luma_offset_l0[i] = 0;
    		slc_parms->luma_weight_l1[i] = 0;
    		slc_parms->luma_offset_l1[i] = 0;
    			
			for (j = 0; j < 2; j++)
			{
   				slc_parms->chroma_weight_l0[i][j] = 0;
    			slc_parms->chroma_offset_l0[i][j] = 0;
    			slc_parms->chroma_weight_l1[i][j] = 0;
	 			slc_parms->chroma_offset_l1[i][j] = 0;
			}			    			
		}
    }
}


static inline void vbp_set_reference_frames_h264(
	struct h264_viddec_parser *parser,
	VAPictureParameterBufferH264* pic_parms)
{	
	int buffer_idx;
	int frame_idx;
	frame_store* store = NULL;
	h264_DecodedPictureBuffer* dpb = &(parser->info.dpb);
	/* initialize reference frames */
	for (frame_idx = 0; frame_idx < 16; frame_idx++)
	{
		pic_parms->ReferenceFrames[frame_idx].picture_id = VA_INVALID_SURFACE;
		pic_parms->ReferenceFrames[frame_idx].frame_idx = 0;
		pic_parms->ReferenceFrames[frame_idx].flags = VA_PICTURE_H264_INVALID;
		pic_parms->ReferenceFrames[frame_idx].TopFieldOrderCnt = 0;
		pic_parms->ReferenceFrames[frame_idx].BottomFieldOrderCnt = 0;
	}
	pic_parms->num_ref_frames = 0;

	frame_idx = 0;

	/* ITRACE("short term frame in dpb %d", dpb->ref_frames_in_buffer);  */
	/* set short term reference frames */
	for (buffer_idx = 0; buffer_idx < dpb->ref_frames_in_buffer; buffer_idx++)
	{
		if (frame_idx >= 16)
		{
			WTRACE("Frame index is out of bound.");
			break;
		}

		store = &dpb->fs[dpb->fs_ref_idc[buffer_idx]];
		/* if (store->is_used == 3 && store->frame.used_for_reference == 3) */
		if (viddec_h264_get_is_used(store))		
		{
			pic_parms->ReferenceFrames[frame_idx].frame_idx = store->frame_num;
			pic_parms->ReferenceFrames[frame_idx].flags = VA_PICTURE_H264_SHORT_TERM_REFERENCE;
			if (FRAME == parser->info.img.structure)
			{
				pic_parms->ReferenceFrames[frame_idx].TopFieldOrderCnt = store->frame.poc;
				pic_parms->ReferenceFrames[frame_idx].BottomFieldOrderCnt = store->frame.poc;
			}
			else
			{
				pic_parms->ReferenceFrames[frame_idx].TopFieldOrderCnt = store->top_field.poc;
				pic_parms->ReferenceFrames[frame_idx].BottomFieldOrderCnt = store->bottom_field.poc;
				if (store->top_field.used_for_reference && store->bottom_field.used_for_reference)
				{
					/* if both fields are used for reference, just set flag to be frame (0) */
				}				
				else
				{
					if (store->top_field.used_for_reference)
						pic_parms->ReferenceFrames[frame_idx].flags |= VA_PICTURE_H264_TOP_FIELD;
					if (store->bottom_field.used_for_reference)
						pic_parms->ReferenceFrames[frame_idx].flags |= VA_PICTURE_H264_BOTTOM_FIELD;
				}
			}			
		}		
		frame_idx++;	
	}

	/* set long term reference frames */
	for (buffer_idx = 0; buffer_idx < dpb->ltref_frames_in_buffer; buffer_idx++)
	{
		if (frame_idx >= 16)
		{
			WTRACE("Frame index is out of bound.");
			break;
		}
		store = &dpb->fs[dpb->fs_ltref_idc[buffer_idx]];
		if (!viddec_h264_get_is_long_term(store))
		{
			WTRACE("long term frame is not marked as long term.");
		}		
		/*if (store->is_used == 3 && store->is_long_term && store->frame.used_for_reference == 3) */
		if (viddec_h264_get_is_used(store))		
		{
			pic_parms->ReferenceFrames[frame_idx].flags = VA_PICTURE_H264_LONG_TERM_REFERENCE;
			if (FRAME == parser->info.img.structure)
			{
				pic_parms->ReferenceFrames[frame_idx].TopFieldOrderCnt = store->frame.poc;
				pic_parms->ReferenceFrames[frame_idx].BottomFieldOrderCnt = store->frame.poc;
			}
			else
			{
				pic_parms->ReferenceFrames[frame_idx].TopFieldOrderCnt = store->top_field.poc;
				pic_parms->ReferenceFrames[frame_idx].BottomFieldOrderCnt = store->bottom_field.poc;
				if (store->top_field.used_for_reference && store->bottom_field.used_for_reference)
				{
					/* if both fields are used for reference, just set flag to be frame (0)*/
				}				
				else
				{
					if (store->top_field.used_for_reference)
						pic_parms->ReferenceFrames[frame_idx].flags |= VA_PICTURE_H264_TOP_FIELD;
					if (store->bottom_field.used_for_reference)
						pic_parms->ReferenceFrames[frame_idx].flags |= VA_PICTURE_H264_BOTTOM_FIELD;
				}
			}			
		}
		frame_idx++;
	}	
	
	pic_parms->num_ref_frames = frame_idx;
	
	if (frame_idx > parser->info.active_SPS.num_ref_frames)
	{
		WTRACE("actual num_ref_frames (%d) exceeds the value in the sequence header (%d).",
			frame_idx, parser->info.active_SPS.num_ref_frames);
	}
}


static inline void vbp_set_scaling_list_h264(
	struct h264_viddec_parser *parser, 
	VAIQMatrixBufferH264* IQ_matrix_buf)
{
  	int i;
    int lists_to_set = 6 + 2 * (parser->info.active_PPS.transform_8x8_mode_flag ? 1 : 0);
    
  	if (parser->info.active_PPS.pic_scaling_matrix_present_flag)
  	{
		for (i = 0; i < lists_to_set; i++)
    	{
      		if (parser->info.active_PPS.pic_scaling_list_present_flag[i])
      		{
        		if (((i < 6) && parser->info.active_PPS.UseDefaultScalingMatrix4x4Flag[i]) ||
            		((i >= 6) && parser->info.active_PPS.UseDefaultScalingMatrix8x8Flag[i-6]))
				{
  	  				/* use default scaling list */
	  				if (i < 6)
          			{
	    				memcpy(IQ_matrix_buf->ScalingList4x4[i], UseDefaultList[i], 16);
	  				}
	  				else
          			{
	    				memcpy(IQ_matrix_buf->ScalingList8x8[i - 6], UseDefaultList[i], 64);
	  				}
				}
				else
				{
	  				/* use PPS list */
	  				if (i < 6)
	  				{
	    				memcpy(IQ_matrix_buf->ScalingList4x4[i], parser->info.active_PPS.ScalingList4x4[i], 16);
	  				}
	  				else
	  				{
	    				memcpy(IQ_matrix_buf->ScalingList8x8[i - 6], parser->info.active_PPS.ScalingList8x8[i - 6], 64);
	  				}
				}
      		}
      		else /* pic_scaling_list not present */
      		{
				if (parser->info.active_SPS.seq_scaling_matrix_present_flag)
				{
  	  				/* SPS matrix present - use fallback rule B */
	  				switch (i)
	  				{
	    				case 0:
	    				case 3:
	      					memcpy(IQ_matrix_buf->ScalingList4x4[i], 
								parser->info.active_SPS.seq_scaling_list_present_flag[i] ? parser->info.active_PPS.ScalingList4x4[i] : UseDefaultList[i], 
                				16);
	      				break;

					    case 6:
	    				case 7:
	      					memcpy(IQ_matrix_buf->ScalingList8x8[i - 6], 
								parser->info.active_SPS.seq_scaling_list_present_flag[i] ? parser->info.active_PPS.ScalingList8x8[i - 6] : UseDefaultList[i], 
                				64);
	      				break;

	    				case 1:
	    				case 2:
	    				case 4:
	    				case 5:
	      					memcpy(IQ_matrix_buf->ScalingList4x4[i], 
								IQ_matrix_buf->ScalingList4x4[i - 1],
                				16);
	      				break;
		
            			default:
	      					g_warning("invalid scaling list index.");
              			break;
	  				}
				}
				else /* seq_scaling_matrix not present */
				{
	  				/* SPS matrix not present - use fallback rule A */
	  				switch (i)
	  				{
	    				case 0:
	    				case 3:
	      					memcpy(IQ_matrix_buf->ScalingList4x4[i], UseDefaultList[i], 16);	
	      				break;

	    				case 6:
	    				case 7:
	      					memcpy(IQ_matrix_buf->ScalingList8x8[i - 6], UseDefaultList[i], 64);
              			break;

				   	    case 1:
	    				case 2:
	    				case 4:
	    				case 5:
	      					memcpy(IQ_matrix_buf->ScalingList4x4[i], 
								IQ_matrix_buf->ScalingList4x4[i - 1],
                				16);
            			break;
	
	    				default:
	      					WTRACE("invalid scaling list index.");
              			break;
	  				}
				} /* end of seq_scaling_matrix not present */
      		} /* end of  pic_scaling_list not present */
    	} /* for loop for each index from 0 to 7 */
  	} /* end of pic_scaling_matrix present */
  	else
  	{
    	/* PPS matrix not present, use SPS information */
    	if (parser->info.active_SPS.seq_scaling_matrix_present_flag)
    	{
      		for (i = 0; i < lists_to_set; i++)
      		{
				if (parser->info.active_SPS.seq_scaling_list_present_flag[i])
				{
          			if (((i < 6) && parser->info.active_SPS.UseDefaultScalingMatrix4x4Flag[i]) ||
            			((i >= 6) && parser->info.active_SPS.UseDefaultScalingMatrix8x8Flag[i - 6]))
	  				{
 	    				/* use default scaling list */
	    				if (i < 6)
            			{
	      					memcpy(IQ_matrix_buf->ScalingList4x4[i], UseDefaultList[i], 16);
	    				}
	    				else
            			{
				      		memcpy(IQ_matrix_buf->ScalingList8x8[i - 6], UseDefaultList[i], 64);
					    }
					}
					else
					{
  	    				/* use SPS list */
	    				if (i < 6)
	    				{
	      					memcpy(IQ_matrix_buf->ScalingList4x4[i], parser->info.active_SPS.ScalingList4x4[i], 16);
	    				}
	    				else
	    				{
	      					memcpy(IQ_matrix_buf->ScalingList8x8[i - 6], parser->info.active_SPS.ScalingList8x8[i - 6], 64);
	    				}
	  				}
				}
				else
				{
	  				/* SPS list not present - use fallback rule A */
	  				switch (i)
	  				{
	    				case 0:
	    				case 3:
	      					memcpy(IQ_matrix_buf->ScalingList4x4[i], UseDefaultList[i], 16);	
              			break;

	    				case 6:
	    				case 7:
	      					memcpy(IQ_matrix_buf->ScalingList8x8[i - 6], UseDefaultList[i], 64);	      
              			break;
	    
	    				case 1:
	    				case 2:
	    				case 4:
	    				case 5:
	      					memcpy(IQ_matrix_buf->ScalingList4x4[i], 
								IQ_matrix_buf->ScalingList4x4[i - 1],
                				16);
              			break;
	
  	    				default:
	      					WTRACE("invalid scaling list index.");
              			break;
	  				}
				}
      		}
    	}
    	else
    	{
      		/* SPS matrix not present - use flat lists */
      		for (i = 0; i < 6; i++)
      		{
				memcpy(IQ_matrix_buf->ScalingList4x4[i], quant_flat, 16);
      		}
      		for (i = 0; i < 2; i++)
      		{
 				memcpy(IQ_matrix_buf->ScalingList8x8[i], quant8_flat, 64);
      		}
    	}
  	}
  	
  	if ((0 == parser->info.active_PPS.transform_8x8_mode_flag) &&
  		(parser->info.active_PPS.pic_scaling_matrix_present_flag || 
  		parser->info.active_SPS.seq_scaling_matrix_present_flag))
  	{
     	for (i = 0; i < 2; i++)
      	{
 			memcpy(IQ_matrix_buf->ScalingList8x8[i], quant8_flat, 64);
      	}  		
  	} 
}

static void vbp_set_codec_data_h264(
	struct h264_viddec_parser *parser,
	vbp_codec_data_h264* codec_data)
{
	/* parameter id */
	codec_data->seq_parameter_set_id = parser->info.active_SPS.seq_parameter_set_id;
	codec_data->pic_parameter_set_id = parser->info.active_PPS.pic_parameter_set_id;
	
	/* profile and level */
	codec_data->profile_idc = parser->info.active_SPS.profile_idc;
	codec_data->level_idc = parser->info.active_SPS.level_idc;
	

	 codec_data->constraint_set1_flag = (parser->info.active_SPS.constraint_set_flags & 0x4) >> 2;


	/* reference frames */
	codec_data->num_ref_frames = parser->info.active_SPS.num_ref_frames;
	
	if (!parser->info.active_SPS.sps_disp.frame_mbs_only_flag &&
		!parser->info.active_SPS.sps_disp.mb_adaptive_frame_field_flag)
	{
		/* no longer necessary: two fields share the same interlaced surface */
		/* codec_data->num_ref_frames *= 2; */
	}
		
	codec_data->gaps_in_frame_num_value_allowed_flag = parser->info.active_SPS.gaps_in_frame_num_value_allowed_flag;	

	/* frame coding */
	codec_data->frame_mbs_only_flag = parser->info.active_SPS.sps_disp.frame_mbs_only_flag;
	codec_data->mb_adaptive_frame_field_flag = parser->info.active_SPS.sps_disp.mb_adaptive_frame_field_flag;	

 	/* frame dimension */
	codec_data->frame_width = (parser->info.active_SPS.sps_disp.pic_width_in_mbs_minus1 + 1 ) * 16;
	
	codec_data->frame_height = (2 - parser->info.active_SPS.sps_disp.frame_mbs_only_flag) * 
			(parser->info.active_SPS.sps_disp.pic_height_in_map_units_minus1 + 1) * 16;
			
	/* frame cropping */
	codec_data->frame_cropping_flag = 
		parser->info.active_SPS.sps_disp.frame_cropping_flag;
	
	codec_data->frame_crop_rect_left_offset = 
		parser->info.active_SPS.sps_disp.frame_crop_rect_left_offset;
	
	codec_data->frame_crop_rect_right_offset = 
		parser->info.active_SPS.sps_disp.frame_crop_rect_right_offset;
		                 
	codec_data->frame_crop_rect_top_offset =
		parser->info.active_SPS.sps_disp.frame_crop_rect_top_offset;
		 
	codec_data->frame_crop_rect_bottom_offset = 
		parser->info.active_SPS.sps_disp.frame_crop_rect_bottom_offset;
	
	/* aspect ratio	  */
	codec_data->aspect_ratio_info_present_flag = 
		parser->info.active_SPS.sps_disp.vui_seq_parameters.aspect_ratio_info_present_flag;
		
	codec_data->aspect_ratio_idc = 
		parser->info.active_SPS.sps_disp.vui_seq_parameters.aspect_ratio_idc;
	
	codec_data->sar_width = 
		parser->info.active_SPS.sps_disp.vui_seq_parameters.sar_width;
		                        
	codec_data->sar_height = 
		parser->info.active_SPS.sps_disp.vui_seq_parameters.sar_height;
		
	 /* video format */
	 codec_data->video_format =
		parser->info.active_SPS.sps_disp.vui_seq_parameters.video_format;  			
	 
	codec_data->video_format =
		parser->info.active_SPS.sps_disp.vui_seq_parameters.video_signal_type_present_flag;  

    /* picture order type and count */
    codec_data->log2_max_pic_order_cnt_lsb_minus4 = parser->info.active_SPS.log2_max_pic_order_cnt_lsb_minus4;
    codec_data->pic_order_cnt_type = parser->info.active_SPS.pic_order_cnt_type;
    
}


static uint32_t vbp_add_pic_data_h264(vbp_context *pcontext, int list_index)
{
	viddec_pm_cxt_t *cxt = pcontext->parser_cxt;

	vbp_data_h264 *query_data = (vbp_data_h264 *)pcontext->query_data;
	struct h264_viddec_parser* parser = NULL;
	vbp_picture_data_h264* pic_data = NULL;
  	VAPictureParameterBufferH264* pic_parms = NULL;
  		
	parser = (struct h264_viddec_parser *)cxt->codec_data;
	
	if (0 == parser->info.SliceHeader.first_mb_in_slice)
	{
		/* a new picture is parsed */
		query_data->num_pictures++;
	}

	if (query_data->num_pictures == 0)
	{
	    /* partial frame */
	    query_data->num_pictures = 1;
        }
	
	if (query_data->num_pictures > MAX_NUM_PICTURES)
	{
		ETRACE("num of pictures exceeds the limit (%d).", MAX_NUM_PICTURES);
		return VBP_DATA;
	}
	
	int pic_data_index = query_data->num_pictures - 1;
	if (pic_data_index < 0)
	{
		WTRACE("MB address does not start from 0!");
		return VBP_DATA;
	}
		
	pic_data = &(query_data->pic_data[pic_data_index]);	
	pic_parms = pic_data->pic_parms;

	// relax this condition to support partial frame parsing
	
	//if (parser->info.SliceHeader.first_mb_in_slice == 0)
	{
		/**
		* picture parameter only needs to be set once,
		* even multiple slices may be encoded 
		*/
		
	  	/* VAPictureParameterBufferH264 */
	  	pic_parms->CurrPic.picture_id = VA_INVALID_SURFACE;
 		pic_parms->CurrPic.frame_idx = 0;
	  	if (parser->info.img.field_pic_flag == 1)
	  	{
	    	if (parser->info.img.bottom_field_flag)
			{
				pic_parms->CurrPic.flags = VA_PICTURE_H264_BOTTOM_FIELD;
			}
	    	else
			{
				/* also OK set to 0 (from test suite) */
				pic_parms->CurrPic.flags = VA_PICTURE_H264_TOP_FIELD;
			}
	  	}
		else
		{
			pic_parms->CurrPic.flags = 0; /* frame picture */
		}
	  	pic_parms->CurrPic.TopFieldOrderCnt = parser->info.img.toppoc;
	  	pic_parms->CurrPic.BottomFieldOrderCnt = parser->info.img.bottompoc;
	  	pic_parms->CurrPic.frame_idx = parser->info.SliceHeader.frame_num;

	  	/* don't care if current frame is used as long term reference */	  	
	  	if (parser->info.SliceHeader.nal_ref_idc != 0)
	  	{
	    	pic_parms->CurrPic.flags |= VA_PICTURE_H264_SHORT_TERM_REFERENCE;
	  	}
	  
	  	pic_parms->picture_width_in_mbs_minus1 = parser->info.active_SPS.sps_disp.pic_width_in_mbs_minus1;
	
	  	/* frame height in MBS */
	  	pic_parms->picture_height_in_mbs_minus1 = (2 - parser->info.active_SPS.sps_disp.frame_mbs_only_flag) * 
			(parser->info.active_SPS.sps_disp.pic_height_in_map_units_minus1 + 1) - 1;
	
	  	pic_parms->bit_depth_luma_minus8 = parser->info.active_SPS.bit_depth_luma_minus8;
	  	pic_parms->bit_depth_chroma_minus8 = parser->info.active_SPS.bit_depth_chroma_minus8;
		
	
		pic_parms->seq_fields.value = 0;
	  	pic_parms->seq_fields.bits.chroma_format_idc = parser->info.active_SPS.sps_disp.chroma_format_idc;
	  	pic_parms->seq_fields.bits.residual_colour_transform_flag = parser->info.active_SPS.residual_colour_transform_flag;
	  	pic_parms->seq_fields.bits.frame_mbs_only_flag = parser->info.active_SPS.sps_disp.frame_mbs_only_flag;
	  	pic_parms->seq_fields.bits.mb_adaptive_frame_field_flag = parser->info.active_SPS.sps_disp.mb_adaptive_frame_field_flag;
	  	pic_parms->seq_fields.bits.direct_8x8_inference_flag = parser->info.active_SPS.sps_disp.direct_8x8_inference_flag;

		/* new fields in libva 0.31 */
		pic_parms->seq_fields.bits.gaps_in_frame_num_value_allowed_flag = parser->info.active_SPS.gaps_in_frame_num_value_allowed_flag;
        pic_parms->seq_fields.bits.log2_max_frame_num_minus4 = parser->info.active_SPS.log2_max_frame_num_minus4;
        pic_parms->seq_fields.bits.pic_order_cnt_type = parser->info.active_SPS.pic_order_cnt_type;
        pic_parms->seq_fields.bits.log2_max_pic_order_cnt_lsb_minus4 = parser->info.active_SPS.log2_max_pic_order_cnt_lsb_minus4;
        pic_parms->seq_fields.bits.delta_pic_order_always_zero_flag =parser->info.active_SPS.delta_pic_order_always_zero_flag;
  
	  	
	  	/* referened from UMG_Moorstown_TestSuites */
	  	pic_parms->seq_fields.bits.MinLumaBiPredSize8x8 = (parser->info.active_SPS.level_idc > 30) ? 1 : 0;
	
	  	pic_parms->num_slice_groups_minus1 = parser->info.active_PPS.num_slice_groups_minus1;
	  	pic_parms->slice_group_map_type = parser->info.active_PPS.slice_group_map_type;
		pic_parms->slice_group_change_rate_minus1 = 0;
	  	pic_parms->pic_init_qp_minus26 = parser->info.active_PPS.pic_init_qp_minus26;
		pic_parms->pic_init_qs_minus26 = 0;
	  	pic_parms->chroma_qp_index_offset = parser->info.active_PPS.chroma_qp_index_offset;
	  	pic_parms->second_chroma_qp_index_offset = parser->info.active_PPS.second_chroma_qp_index_offset;
	
		pic_parms->pic_fields.value = 0;
	  	pic_parms->pic_fields.bits.entropy_coding_mode_flag = parser->info.active_PPS.entropy_coding_mode_flag;
	  	pic_parms->pic_fields.bits.weighted_pred_flag = parser->info.active_PPS.weighted_pred_flag;
	  	pic_parms->pic_fields.bits.weighted_bipred_idc = parser->info.active_PPS.weighted_bipred_idc;
	  	pic_parms->pic_fields.bits.transform_8x8_mode_flag = parser->info.active_PPS.transform_8x8_mode_flag;
	
		/* new LibVA fields in v0.31*/
		pic_parms->pic_fields.bits.pic_order_present_flag = parser->info.active_PPS.pic_order_present_flag;
		pic_parms->pic_fields.bits.deblocking_filter_control_present_flag = parser->info.active_PPS.deblocking_filter_control_present_flag;
        pic_parms->pic_fields.bits.redundant_pic_cnt_present_flag = parser->info.active_PPS.redundant_pic_cnt_present_flag;
        pic_parms->pic_fields.bits.reference_pic_flag = parser->info.SliceHeader.nal_ref_idc != 0;

	  	/* all slices in the pciture have the same field_pic_flag */
	  	pic_parms->pic_fields.bits.field_pic_flag = parser->info.SliceHeader.field_pic_flag;
	  	pic_parms->pic_fields.bits.constrained_intra_pred_flag = parser->info.active_PPS.constrained_intra_pred_flag;
	
	  	pic_parms->frame_num = parser->info.SliceHeader.frame_num;			  	
	} 		

			
	/* set reference frames, and num_ref_frames */
  	vbp_set_reference_frames_h264(parser, pic_parms);	
	if (parser->info.nal_unit_type == h264_NAL_UNIT_TYPE_IDR)
	{
		/* num of reference frame is 0 if current picture is IDR */
		pic_parms->num_ref_frames = 0;
	}
	else
	{
		/* actual num_ref_frames is set in vbp_set_reference_frames_h264 */
	}	
	
	return VBP_OK;
}

#if 0
static inline void vbp_update_reference_frames_h264_methodA(vbp_picture_data_h264* pic_data)
{
  	VAPictureParameterBufferH264* pic_parms = pic_data->pic_parms;
  	
	char is_used[16];
	memset(is_used, 0, sizeof(is_used));
		
	int ref_list;
	int slice_index;
	int i, j;	
	VAPictureH264* pRefList = NULL;
	
	for (slice_index = 0; slice_index < pic_data->num_slices; slice_index++)
	{
		VASliceParameterBufferH264* slice_parms =
			 &(pic_data->slc_data[slice_index].slc_parms);
		
		for (ref_list = 0; ref_list < 2; ref_list++)
		{						
			if (0 == ref_list)
				pRefList = slice_parms->RefPicList0;
			else
				pRefList = slice_parms->RefPicList1;
				
			for (i = 0; i < 32; i++, pRefList++)
			{
				if (VA_PICTURE_H264_INVALID == pRefList->flags)
					break;
					
				for (j = 0; j < 16; j++)
				{
					if (pic_parms->ReferenceFrames[j].TopFieldOrderCnt ==
						pRefList->TopFieldOrderCnt)
					{
						is_used[j] = 1;
						break;
					}
				}
			}
		}		
	}
	
	int frame_idx = 0;
  	VAPictureH264* pRefFrame = pic_parms->ReferenceFrames;
  	for (i = 0; i < 16; i++)
	{
		if (is_used[i])
		{
			memcpy(pRefFrame,
				&(pic_parms->ReferenceFrames[i]),
				sizeof(VAPictureH264));
		
			pRefFrame++;
			frame_idx++;
		}
	}
	pic_parms->num_ref_frames = frame_idx;
			
	for (; frame_idx < 16; frame_idx++)
	{
		pRefFrame->picture_id = VA_INVALID_SURFACE;
		pRefFrame->frame_idx = -1;
		pRefFrame->flags = VA_PICTURE_H264_INVALID;
		pRefFrame->TopFieldOrderCnt = -1;
		pRefFrame->BottomFieldOrderCnt = -1;
		pRefFrame++;
	}	
}
#endif

#if 0
static inline void vbp_update_reference_frames_h264_methodB(vbp_picture_data_h264* pic_data)
{
  	VAPictureParameterBufferH264* pic_parms = pic_data->pic_parms;
	int i;
  	VAPictureH264* pRefFrame = pic_parms->ReferenceFrames;
  	for (i = 0; i < 16; i++)
	{
		pRefFrame->picture_id = VA_INVALID_SURFACE;
		pRefFrame->frame_idx = -1;
		pRefFrame->flags = VA_PICTURE_H264_INVALID;
		pRefFrame->TopFieldOrderCnt = -1;
		pRefFrame->BottomFieldOrderCnt = -1;
		pRefFrame++;
	}	

	pic_parms->num_ref_frames = 0;
	
	  	
	int ref_list;
	int slice_index;
	int j;	
	VAPictureH264* pRefList = NULL;
	
	for (slice_index = 0; slice_index < pic_data->num_slices; slice_index++)
	{
		VASliceParameterBufferH264* slice_parms =
			 &(pic_data->slc_data[slice_index].slc_parms);
		
		for (ref_list = 0; ref_list < 2; ref_list++)
		{						
			if (0 == ref_list)
				pRefList = slice_parms->RefPicList0;
			else
				pRefList = slice_parms->RefPicList1;
				
			for (i = 0; i < 32; i++, pRefList++)
			{
				if (VA_PICTURE_H264_INVALID == pRefList->flags)
					break;
					
				for (j = 0; j < 16; j++)
				{
					if (pic_parms->ReferenceFrames[j].TopFieldOrderCnt ==
						pRefList->TopFieldOrderCnt)
					{
						pic_parms->ReferenceFrames[j].flags |= 
							pRefList->flags;
							
						if ((pic_parms->ReferenceFrames[j].flags & VA_PICTURE_H264_TOP_FIELD) &&
							(pic_parms->ReferenceFrames[j].flags & VA_PICTURE_H264_BOTTOM_FIELD))
						{
							pic_parms->ReferenceFrames[j].flags = 0;
						}						
						break;
					}
				}
				if (j == 16)
				{
					memcpy(&(pic_parms->ReferenceFrames[pic_parms->num_ref_frames++]),
						pRefList,
						sizeof(VAPictureH264));
				}
					
			}
		}		
	}
}
#endif


static uint32_t vbp_add_slice_data_h264(vbp_context *pcontext, int index)
{
  	viddec_pm_cxt_t *cxt = pcontext->parser_cxt;
  	uint32 bit, byte;  
  	uint8 is_emul;
   	
	vbp_data_h264 *query_data = (vbp_data_h264 *)pcontext->query_data;
	VASliceParameterBufferH264 *slc_parms = NULL;
	vbp_slice_data_h264 *slc_data = NULL;
	struct h264_viddec_parser* h264_parser = NULL;
	h264_Slice_Header_t* slice_header = NULL;
	vbp_picture_data_h264* pic_data = NULL;
  	
        
	h264_parser = (struct h264_viddec_parser *)cxt->codec_data;
	int pic_data_index = query_data->num_pictures - 1;
	if (pic_data_index < 0)
	{
		ETRACE("invalid picture data index.");
		return VBP_DATA;
	}
	
	pic_data = &(query_data->pic_data[pic_data_index]);
	
	slc_data = &(pic_data->slc_data[pic_data->num_slices]);       
	slc_data->buffer_addr = cxt->parse_cubby.buf;        
	slc_parms = &(slc_data->slc_parms);
	
	/* byte: how many bytes have been parsed */
	/* bit: bits parsed within the current parsing position */
	viddec_pm_get_au_pos(cxt, &bit, &byte, &is_emul);

   	 	
#if 0
	/* add 4 bytes of start code prefix */
	slc_parms->slice_data_size = slc_data->slice_size =
          pcontext->parser_cxt->list.data[index].edpos -  
          pcontext->parser_cxt->list.data[index].stpos + 4; 
          
	slc_data->slice_offset = pcontext->parser_cxt->list.data[index].stpos - 4;
	
	/* overwrite the "length" bytes to start code (0x00000001) */
	*(slc_data->buffer_addr + slc_data->slice_offset) = 0;
	*(slc_data->buffer_addr + slc_data->slice_offset + 1) = 0;
	*(slc_data->buffer_addr + slc_data->slice_offset + 2) = 0;
	*(slc_data->buffer_addr + slc_data->slice_offset + 3) = 1;
	

	/* the offset to the NAL start code for this slice */
	slc_parms->slice_data_offset = 0;
        
	/* whole slice is in this buffer */
	slc_parms->slice_data_flag = VA_SLICE_DATA_FLAG_ALL;
        
	/* bit offset from NAL start code to the beginning of slice data */
	/* slc_parms->slice_data_bit_offset = bit;*/
	slc_parms->slice_data_bit_offset = (byte + 4)* 8 + bit;
	
#else
	slc_parms->slice_data_size = slc_data->slice_size =
          pcontext->parser_cxt->list.data[index].edpos -  
          pcontext->parser_cxt->list.data[index].stpos; 
          
	/* the offset to the NAL start code for this slice */
	slc_data->slice_offset = cxt->list.data[index].stpos;
	slc_parms->slice_data_offset = 0;
        
	/* whole slice is in this buffer */
	slc_parms->slice_data_flag = VA_SLICE_DATA_FLAG_ALL;
        
	/* bit offset from NAL start code to the beginning of slice data */
	slc_parms->slice_data_bit_offset = bit + byte * 8;
#endif
	
	if (is_emul)
	{
		WTRACE("next byte is emulation prevention byte.");
		/*slc_parms->slice_data_bit_offset += 8; */
	}
	   
	if (cxt->getbits.emulation_byte_counter != 0)
   	{
   		slc_parms->slice_data_bit_offset -= cxt->getbits.emulation_byte_counter * 8;
   	}
   
	slice_header = &(h264_parser->info.SliceHeader);
	slc_parms->first_mb_in_slice = slice_header->first_mb_in_slice;
	
	if(h264_parser->info.active_SPS.sps_disp.mb_adaptive_frame_field_flag & 
		(!(h264_parser->info.SliceHeader.field_pic_flag))) 
	{
			slc_parms->first_mb_in_slice /= 2;
	}
				
	slc_parms->slice_type = slice_header->slice_type;

	slc_parms->direct_spatial_mv_pred_flag = slice_header->direct_spatial_mv_pred_flag;
 		
	slc_parms->num_ref_idx_l0_active_minus1 = 0;
	slc_parms->num_ref_idx_l1_active_minus1 = 0;
	if (slice_header->slice_type == h264_PtypeI)
	{
	}
	else if (slice_header->slice_type == h264_PtypeP)
	{
		slc_parms->num_ref_idx_l0_active_minus1 = slice_header->num_ref_idx_l0_active - 1;	
	}
	else if (slice_header->slice_type == h264_PtypeB)
	{
		slc_parms->num_ref_idx_l0_active_minus1 = slice_header->num_ref_idx_l0_active - 1;	
		slc_parms->num_ref_idx_l1_active_minus1 = slice_header->num_ref_idx_l1_active - 1;
	}
	else
	{
		WTRACE("slice type %d is not supported.", slice_header->slice_type);
	}
    	
	slc_parms->cabac_init_idc = slice_header->cabac_init_idc;
	slc_parms->slice_qp_delta = slice_header->slice_qp_delta;
	slc_parms->disable_deblocking_filter_idc = slice_header->disable_deblocking_filter_idc;
	slc_parms->slice_alpha_c0_offset_div2 = slice_header->slice_alpha_c0_offset_div2;
	slc_parms->slice_beta_offset_div2 = slice_header->slice_beta_offset_div2;
    	
    
	vbp_set_pre_weight_table_h264(h264_parser, slc_parms);
	vbp_set_slice_ref_list_h264(h264_parser, slc_parms);


	pic_data->num_slices++;  
	
	//vbp_update_reference_frames_h264_methodB(pic_data);
	if (pic_data->num_slices > MAX_NUM_SLICES)
	{
		ETRACE("number of slices per picture exceeds the limit (%d).", MAX_NUM_SLICES);
		return VBP_DATA;
	}
	
	/*if (pic_data->num_slices > 1)
	{
	    ITRACE("number of slices per picture is %d.", pic_data->num_slices);
	}*/
	return VBP_OK;
}

/**
* parse decoder configuration data
*/
uint32 vbp_parse_init_data_h264(vbp_context* pcontext)
{	
	/* parsing AVCDecoderConfigurationRecord structure (see MPEG-4 part 15 spec) */

  	uint8 configuration_version = 0;
	uint8 AVC_profile_indication = 0;
  	uint8 profile_compatibility = 0;
 	uint8 AVC_level_indication = 0;
  	uint8 length_size_minus_one = 0;
  	uint8 num_of_sequence_parameter_sets = 0;
  	uint8 num_of_picture_parameter_sets = 0;
  	uint16 sequence_parameter_set_length = 0;
  	uint16 picture_parameter_set_length = 0;
  
  	int i = 0;
	viddec_pm_cxt_t *cxt = pcontext->parser_cxt;

	/* check if configuration data is start code prefix */
	viddec_sc_parse_cubby_cxt_t cubby = cxt->parse_cubby;
	viddec_parser_ops_t *ops = pcontext->parser_ops;
	int ret = ops->parse_sc((void *)&cubby,
						NULL, /* context, not used */
						&(cxt->sc_prefix_info));
	if (ret == 1)
	{
		WTRACE("configuration data is start-code prefixed.\n");
		bitstream_pattern = H264_BS_SC_PREFIXED;
		return vbp_parse_start_code_h264(pcontext);
	}


	uint8* cur_data = cxt->parse_cubby.buf;

	
	if (cxt->parse_cubby.size < 6)
	{
		/* need at least 6 bytes to start parsing the structure, see spec 15 */
		return VBP_DATA;
	}
  
  	configuration_version = *cur_data++;
  	AVC_profile_indication = *cur_data++;
	
	/*ITRACE("Profile indication: %d", AVC_profile_indication); */

  	profile_compatibility = *cur_data++;
  	AVC_level_indication = *cur_data++;
  
	/* ITRACE("Level indication: %d", AVC_level_indication);*/
  	/* 2 bits of length_size_minus_one, 6 bits of reserved (11111) */
  	length_size_minus_one = (*cur_data) & 0x3; 

	if (length_size_minus_one != 3)
	{
		WTRACE("length size (%d) is not equal to 4.", length_size_minus_one + 1);
	}

	NAL_length_size = length_size_minus_one + 1;
	
  	cur_data++;
  
  	/* 3 bits of reserved (111) and 5 bits of num_of_sequence_parameter_sets */
  	num_of_sequence_parameter_sets = (*cur_data) & 0x1f;
	if (num_of_sequence_parameter_sets > 1)
	{
		WTRACE("num_of_sequence_parameter_sets is %d.", num_of_sequence_parameter_sets);
	}  
	if (num_of_sequence_parameter_sets > MAX_NUM_SPS)
	{
		/* this would never happen as MAX_NUM_SPS = 32 */
		WTRACE("num_of_sequence_parameter_sets (%d) exceeds the limit (%d).", num_of_sequence_parameter_sets, MAX_NUM_SPS);
	}
  	cur_data++;
  
  	cxt->list.num_items = 0;
  	for (i = 0; i < num_of_sequence_parameter_sets; i++)
  	{
		if (cur_data - cxt->parse_cubby.buf + 2 > cxt->parse_cubby.size)
		{
			/* need at least 2 bytes to parse sequence_parameter_set_length */
			ETRACE("Not enough data to parse SPS length.");
			return VBP_DATA;
		}

  		/* 16 bits */
  		sequence_parameter_set_length = vbp_utils_ntohs(cur_data);
  	
 
  		cur_data += 2;
  	
		if (cur_data - cxt->parse_cubby.buf + sequence_parameter_set_length > cxt->parse_cubby.size)
		{
			/* need at least sequence_parameter_set_length bytes for SPS */
			ETRACE("Not enough data to parse SPS.");
			return VBP_DATA;
		}

		cxt->list.data[cxt->list.num_items].stpos = cur_data - cxt->parse_cubby.buf;
    
    	/* end pos is exclusive */
    	cxt->list.data[cxt->list.num_items].edpos = 
    		cxt->list.data[cxt->list.num_items].stpos + sequence_parameter_set_length;
     
    	cxt->list.num_items++;
  	
  		cur_data += sequence_parameter_set_length;
  	}
  
	if (cur_data - cxt->parse_cubby.buf + 1 > cxt->parse_cubby.size)
	{
		/* need at least one more byte to parse num_of_picture_parameter_sets */
		ETRACE("Not enough data to parse number of PPS.");
		return VBP_DATA;
	}

  	num_of_picture_parameter_sets = *cur_data++;
	if (num_of_picture_parameter_sets > 1)
	{
		/* g_warning("num_of_picture_parameter_sets is %d.", num_of_picture_parameter_sets); */
	}  
	  
  	for (i = 0; i < num_of_picture_parameter_sets; i++)
  	{
		if (cur_data - cxt->parse_cubby.buf + 2 > cxt->parse_cubby.size)
		{
			/* need at least 2 bytes to parse picture_parameter_set_length */
			ETRACE("Not enough data to parse PPS length.");
			return VBP_DATA;
		}

		/* 16 bits */
  		picture_parameter_set_length = vbp_utils_ntohs(cur_data); 

  		cur_data += 2;
  	
		if (cur_data - cxt->parse_cubby.buf + picture_parameter_set_length > cxt->parse_cubby.size)
		{
			/* need at least picture_parameter_set_length bytes for PPS */
			ETRACE("Not enough data to parse PPS.");
			return VBP_DATA;
		}

    	cxt->list.data[cxt->list.num_items].stpos = cur_data - cxt->parse_cubby.buf;
    
    	/* end pos is exclusive */
    	cxt->list.data[cxt->list.num_items].edpos = 
    		cxt->list.data[cxt->list.num_items].stpos + picture_parameter_set_length;
     
    	cxt->list.num_items++;
  	
  		cur_data += picture_parameter_set_length;
  	}
  
  	if ((cur_data - cxt->parse_cubby.buf) !=  cxt->parse_cubby.size)
  	{
  		WTRACE("Not all initialization data is parsed. Size = %d, parsed = %d.",
  			cxt->parse_cubby.size, (cur_data - cxt->parse_cubby.buf));
  	}

    bitstream_pattern = H264_BS_LENGTH_PREFIXED;
 	return VBP_OK;
}

static inline uint32_t vbp_get_NAL_length_h264(uint8_t* p)
{
	switch (NAL_length_size)
	{
		case 4:
			return vbp_utils_ntohl(p);
		
		case 3:
		{
			uint32_t i = ((*p) << 16) + ((*(p+1)) << 8) + ((*(p+2)));
			return i;
		}
		
		case 2:
			return vbp_utils_ntohs(p);
		
		case 1:
			return *p;
		
		default:
			WTRACE("invalid NAL_length_size: %d.", NAL_length_size);
			/* default to 4 bytes for length */
			NAL_length_size = 4;
			return vbp_utils_ntohl(p);
	}	
}

/**
** H.264 elementary stream does not have start code.
* instead, it is comprised of size of NAL unit and payload
* of NAL unit. See spec 15 (Sample format)
*/
uint32 vbp_parse_start_code_h264(vbp_context *pcontext)
{	
    viddec_pm_cxt_t *cxt = pcontext->parser_cxt;

    /* reset query data for the new sample buffer */
    vbp_data_h264* query_data = (vbp_data_h264*)pcontext->query_data;
    int i;

    for (i = 0; i < MAX_NUM_PICTURES; i++)
    {
        query_data->pic_data[i].num_slices = 0;
    }
    query_data->num_pictures = 0;

    cxt->list.num_items = 0;

    /* reset start position of first item to 0 in case there is only one item */
    cxt->list.data[0].stpos = 0;

    /* start code emulation prevention byte is present in NAL */ 
    cxt->getbits.is_emul_reqd = 1; 

    if (bitstream_pattern == H264_BS_LENGTH_PREFIXED)
    {
        viddec_sc_parse_cubby_cxt_t* cubby = NULL;
        int32_t size_left = 0;
        int32_t size_parsed = 0;
        int32_t NAL_length = 0;

        cubby = &(cxt->parse_cubby);

        size_left = cubby->size;

        while (size_left >= NAL_length_size)
        {
            NAL_length = vbp_get_NAL_length_h264(cubby->buf + size_parsed);    	

            size_parsed += NAL_length_size;
            cxt->list.data[cxt->list.num_items].stpos = size_parsed;
            size_parsed += NAL_length; /* skip NAL bytes */
            /* end position is exclusive */
            cxt->list.data[cxt->list.num_items].edpos = size_parsed; 
            cxt->list.num_items++;
            if (cxt->list.num_items >= MAX_IBUFS_PER_SC)
            {
                ETRACE("num of list items exceeds the limit (%d).", MAX_IBUFS_PER_SC);
                break;
            }

            size_left = cubby->size - size_parsed;
        }

        if (size_left != 0 && length_prefix_verified == 0)
        {
            WTRACE("Elementary stream is not aligned (%d).", size_left);

            /* attempt to correct length prefix to start-code prefix only once, if it succeeds, we will
                    * alway treat bit stream as start-code prefixed; otherwise, treat bit stream as length prefixed
                    */
            length_prefix_verified = 1;
            viddec_sc_parse_cubby_cxt_t temp_cubby = cxt->parse_cubby;

            viddec_parser_ops_t *ops = pcontext->parser_ops;
            int ret = ops->parse_sc((void *)&temp_cubby,
                NULL, /* context, not used */
                &(cxt->sc_prefix_info));
                
            /* found start code */    	            		    
            if (ret == 1)
            {
                WTRACE("Stream was supposed to be length prefixed, but actually is start-code prefixed.");
                NAL_length_size = 0;
                bitstream_pattern = H264_BS_SC_PREFIXED;
                /* reset parsing data */    	    	   
                for (i = 0; i < MAX_NUM_PICTURES; i++)
                {
                   query_data->pic_data[i].num_slices = 0;
                }
                query_data->num_pictures = 0;            	
                cxt->list.num_items = 0;    	    	
            }        	
        }   
    } 


    if (bitstream_pattern == H264_BS_SC_PREFIXED)
    {
        viddec_sc_parse_cubby_cxt_t cubby;
        /*  memory copy without updating cxt->parse_cubby */
        cubby = cxt->parse_cubby;
        viddec_parser_ops_t *ops = pcontext->parser_ops;
        int ret = 0;

        while(1)
        {
            ret = ops->parse_sc((void *)&cubby, 
                NULL, /* context, not used */
                &(cxt->sc_prefix_info));
            if(ret == 1)
            {
                cubby.phase = 0;

                if (cxt->list.num_items == 0)
                {
                    cxt->list.data[0].stpos = cubby.sc_end_pos;
                }
                else
                {
                    cxt->list.data[cxt->list.num_items - 1].edpos =
                    cubby.sc_end_pos + cxt->list.data[cxt->list.num_items - 1].stpos;

                    cxt->list.data[cxt->list.num_items].stpos =
                    cxt->list.data[cxt->list.num_items - 1].edpos;    		
                }

                cubby.buf = cxt->parse_cubby.buf +
                cxt->list.data[cxt->list.num_items].stpos;

                cubby.size = cxt->parse_cubby.size -
                cxt->list.data[cxt->list.num_items].stpos;

                cxt->list.num_items++;
                if (cxt->list.num_items >= MAX_IBUFS_PER_SC)
                {
                    WTRACE("Num items exceeds the limit!");
                    /* not fatal, just stop parsing */
                    break;
                }
            }
            else
            {
                if (cxt->list.num_items == 0)
                {
                    cxt->list.num_items = 1;
                    bitstream_pattern = H264_BS_SINGLE_NAL;
                    WTRACE("Stream was supposed to be SC prefixed, but actually contains a single NAL.");
                }
                cxt->list.data[cxt->list.num_items - 1].edpos = cxt->parse_cubby.size;
                break;
            }
        }    

    }

    if (bitstream_pattern == H264_BS_SINGLE_NAL)
    {
        cxt->list.num_items = 1;
        cxt->list.data[0].stpos = 0;
        cxt->list.data[0].edpos = cxt->parse_cubby.size;
    }


    return VBP_OK;
}

/**
*
* process parsing result after a NAL unit is parsed
* 
*/
uint32 vbp_process_parsing_result_h264( vbp_context *pcontext, int i)
{  	
	if (i >= MAX_NUM_SLICES)
	{
		return VBP_PARM;
	}
	
	uint32 error = VBP_OK;

  	struct h264_viddec_parser* parser = NULL;
	parser = (struct h264_viddec_parser *)&( pcontext->parser_cxt->codec_data[0]);
	vbp_data_h264* query_data = (vbp_data_h264 *)pcontext->query_data;
	switch (parser->info.nal_unit_type)
    {
		case h264_NAL_UNIT_TYPE_SLICE:       		
       	//ITRACE("slice header is parsed.");
       	error = vbp_add_pic_data_h264(pcontext, i);
       	if (VBP_OK == error)
       	{
       		error = vbp_add_slice_data_h264(pcontext, i);
       	}
       	break;
       		
       	case  h264_NAL_UNIT_TYPE_IDR:
       	//ITRACE("IDR header is parsed.");
       	error = vbp_add_pic_data_h264(pcontext, i);
       	if (VBP_OK == error)
       	{
       		error = vbp_add_slice_data_h264(pcontext, i);
       	}       	
       	break;
       		
       	case h264_NAL_UNIT_TYPE_SEI:
		//ITRACE("SEI header is parsed.");
       	break;
       		
     	case h264_NAL_UNIT_TYPE_SPS:
     	query_data->has_sps = 1;
     	query_data->has_pps = 0;
        ITRACE("SPS header is parsed.");
 		break;
       		
       	case h264_NAL_UNIT_TYPE_PPS:
       	query_data->has_pps = 1;
       	ITRACE("PPS header is parsed.");
       	break;
       		
      	case h264_NAL_UNIT_TYPE_Acc_unit_delimiter:
       	//ITRACE("ACC unit delimiter is parsed.");
       	break;
       		
      	case h264_NAL_UNIT_TYPE_EOSeq:
       	ITRACE("EOSeq is parsed.");
      	break;
 
     	case h264_NAL_UNIT_TYPE_EOstream:
      	 ITRACE("EOStream is parsed.");
       	break;
        		
     	default:  	
	    WTRACE("unknown header %d is parsed.", parser->info.nal_unit_type); 
       	break;
	}  
	return error;    		    
}

/*
*
* fill query data structure after sample buffer is parsed
*
*/
uint32 vbp_populate_query_data_h264(vbp_context *pcontext)
{
  	vbp_data_h264 *query_data = NULL;
  	struct h264_viddec_parser *parser = NULL;
 
   	parser = (struct h264_viddec_parser *)pcontext->parser_cxt->codec_data;
  	query_data = (vbp_data_h264 *)pcontext->query_data;
  	  	  	
  	vbp_set_codec_data_h264(parser, query_data->codec_data);
  	
  	/* buffer number */
  	query_data->buf_number = buffer_counter;

  	/* VQIAMatrixBufferH264 */
  	vbp_set_scaling_list_h264(parser, query_data->IQ_matrix_buf);
  
	if (query_data->num_pictures > 0)
	{
		/*
		* picture parameter buffer and slice parameter buffer have been populated
		*/
	}
	else
	{
		/**
		* add a dummy picture that contains picture parameters parsed
		  from SPS and PPS.
		*/
		vbp_add_pic_data_h264(pcontext, 0);
	}
  	return VBP_OK;
}