encode/jpegenc_utils.h - third_party/github.com/intel/libva-utils - Git at Google

 /*
  * Copyright (c) 2014 Intel Corporation. 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 PRECISION INSIGHT 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.
  */
 /*
  * This file is a utilities file which supports JPEG Encode process
  */

 #include <sys/types.h>
 #include <stdio.h>

 #define MAX_JPEG_COMPONENTS 3 //only for Y, U and V
 #define JPEG_Y 0
 #define JPEG_U 1
 #define JPEG_V 2
 #define NUM_QUANT_ELEMENTS 64
 #define NUM_MAX_HUFFTABLE 2
 #define NUM_AC_RUN_SIZE_BITS 16
 #define NUM_AC_CODE_WORDS_HUFFVAL 162
 #define NUM_DC_RUN_SIZE_BITS 16
 #define NUM_DC_CODE_WORDS_HUFFVAL 12

 #define BITSTREAM_ALLOCATE_STEPPING     4096

 struct __bitstream {
     unsigned int *buffer;
     int bit_offset;
     int max_size_in_dword;
 };

 typedef struct __bitstream bitstream;

 static unsigned int
 swap32(unsigned int val)
 {
     unsigned char *pval = (unsigned char *)&val;

     return ((pval[0] << 24)     |
             (pval[1] << 16)     |
             (pval[2] << 8)      |
             (pval[3] << 0));
 }

 static void
 bitstream_start(bitstream *bs)
 {
     bs->max_size_in_dword = BITSTREAM_ALLOCATE_STEPPING;
     bs->buffer = calloc(bs->max_size_in_dword * sizeof(int), 1);
     assert(bs->buffer);
     bs->bit_offset = 0;
 }

 static void
 bitstream_end(bitstream *bs)
 {
     int pos = (bs->bit_offset >> 5);
     int bit_offset = (bs->bit_offset & 0x1f);
     int bit_left = 32 - bit_offset;

     if (bit_offset) {
         bs->buffer[pos] = swap32((bs->buffer[pos] << bit_left));
     }
 }

 static void
 bitstream_put_ui(bitstream *bs, unsigned int val, int size_in_bits)
 {
     int pos = (bs->bit_offset >> 5);
     int bit_offset = (bs->bit_offset & 0x1f);
     int bit_left = 32 - bit_offset;

     if (!size_in_bits)
         return;

     if (size_in_bits < 32)
         val &= ((1 << size_in_bits) - 1);

     bs->bit_offset += size_in_bits;

     if (bit_left > size_in_bits) {
         bs->buffer[pos] = (bs->buffer[pos] << size_in_bits | val);
     } else {
         size_in_bits -= bit_left;
         bs->buffer[pos] = (bs->buffer[pos] << bit_left) | (val >> size_in_bits);
         bs->buffer[pos] = swap32(bs->buffer[pos]);

         if (pos + 1 == bs->max_size_in_dword) {
             bs->max_size_in_dword += BITSTREAM_ALLOCATE_STEPPING;
             bs->buffer = realloc(bs->buffer, bs->max_size_in_dword * sizeof(unsigned int));
             assert(bs->buffer);
         }

         bs->buffer[pos + 1] = val;
     }
 }

 //As per Jpeg Spec ISO/IEC 10918-1, below values are assigned
 enum jpeg_markers {

 //Define JPEG markers as 0xFFXX if you are adding the value directly to the buffer
 //Else define marker as 0xXXFF if you are assigning the marker to a structure variable.
 //This is needed because of the little-endedness of the IA

     SOI  = 0xFFD8, //Start of Image
     EOI  = 0xFFD9, //End of Image
     SOS  = 0xFFDA, //Start of Scan
     DQT  = 0xFFDB, //Define Quantization Table
     DRI  = 0xFFDD, //Define restart interval
     RST0 = 0xFFD0, //Restart interval termination
     DHT  = 0xFFC4, //Huffman table
     SOF0 = 0xFFC0, //Baseline DCT
     APP0 = 0xFFE0, //Application Segment
     COM  = 0xFFFE  //Comment segment
 };

 typedef struct _JPEGFrameHeader {

     uint16_t SOF;    //Start of Frame Header
     uint16_t Lf;     //Length of Frame Header
     uint8_t  P;      //Sample precision
     uint16_t Y;      //Number of lines
     uint16_t X;      //Number of samples per line
     uint8_t  Nf;     //Number of image components in frame

     struct _JPEGComponent {
         uint8_t Ci;    //Component identifier
         uint8_t Hi: 4; //Horizontal sampling factor
         uint8_t Vi: 4; //Vertical sampling factor
         uint8_t Tqi;   //Quantization table destination selector
     } JPEGComponent[MAX_JPEG_COMPONENTS];

 } JPEGFrameHeader;


 typedef struct _JPEGScanHeader {

     uint16_t SOS;  //Start of Scan
     uint16_t Ls;   //Length of Scan
     uint8_t  Ns;   //Number of image components in the scan

     struct _ScanComponent {
         uint8_t Csj;   //Scan component selector
         uint8_t Tdj: 4; //DC Entropy coding table destination selector(Tdj:4 bits)
         uint8_t Taj: 4; //AC Entropy coding table destination selector(Taj:4 bits)
     } ScanComponent[MAX_JPEG_COMPONENTS];

     uint8_t Ss;    //Start of spectral or predictor selection, 0 for Baseline
     uint8_t Se;    //End of spectral or predictor selection, 63 for Baseline
     uint8_t Ah: 4; //Successive approximation bit position high, 0 for Baseline
     uint8_t Al: 4; //Successive approximation bit position low, 0 for Baseline

 } JPEGScanHeader;


 typedef struct _JPEGQuantSection {

     uint16_t DQT;    //Quantization table marker
     uint16_t Lq;     //Length of Quantization table definition
     uint8_t  Tq: 4;  //Quantization table destination identifier
     uint8_t  Pq: 4;  //Quatization table precision. Should be 0 for 8-bit samples
     uint8_t  Qk[NUM_QUANT_ELEMENTS]; //Quantization table elements

 } JPEGQuantSection;

 typedef struct _JPEGHuffSection {

     uint16_t DHT;                            //Huffman table marker
     uint16_t Lh;                             //Huffman table definition length
     uint8_t  Tc: 4;                          //Table class- 0:DC, 1:AC
     uint8_t  Th: 4;                          //Huffman table destination identifier
     uint8_t  Li[NUM_AC_RUN_SIZE_BITS];       //Number of Huffman codes of length i
     uint8_t  Vij[NUM_AC_CODE_WORDS_HUFFVAL]; //Value associated with each Huffman code

 } JPEGHuffSection;


 typedef struct _JPEGRestartSection {

     uint16_t DRI;  //Restart interval marker
     uint16_t Lr;   //Legth of restart interval segment
     uint16_t Ri;   //Restart interval

 } JPEGRestartSection;


 typedef struct _JPEGCommentSection {

     uint16_t COM;  //Comment marker
     uint16_t Lc;   //Comment segment length
     uint8_t  Cmi;  //Comment byte

 } JPEGCommentSection;


 typedef struct _JPEGAppSection {

     uint16_t APPn;  //Application data marker
     uint16_t Lp;    //Application data segment length
     uint8_t  Api;   //Application data byte

 } JPEGAppSection;

 //Luminance quantization table
 //Source: Jpeg Spec ISO/IEC 10918-1, Annex K, Table K.1
 uint8_t jpeg_luma_quant[NUM_QUANT_ELEMENTS] = {
     16, 11, 10, 16, 24,  40,  51,  61,
     12, 12, 14, 19, 26,  58,  60,  55,
     14, 13, 16, 24, 40,  57,  69,  56,
     14, 17, 22, 29, 51,  87,  80,  62,
     18, 22, 37, 56, 68,  109, 103, 77,
     24, 35, 55, 64, 81,  104, 113, 92,
     49, 64, 78, 87, 103, 121, 120, 101,
     72, 92, 95, 98, 112, 100, 103, 99
 };

 //Luminance quantization table
 //Source: Jpeg Spec ISO/IEC 10918-1, Annex K, Table K.2
 uint8_t jpeg_chroma_quant[NUM_QUANT_ELEMENTS] = {
     17, 18, 24, 47, 99, 99, 99, 99,
     18, 21, 26, 66, 99, 99, 99, 99,
     24, 26, 56, 99, 99, 99, 99, 99,
     47, 66, 99, 99, 99, 99, 99, 99,
     99, 99, 99, 99, 99, 99, 99, 99,
     99, 99, 99, 99, 99, 99, 99, 99,
     99, 99, 99, 99, 99, 99, 99, 99,
     99, 99, 99, 99, 99, 99, 99, 99
 };


 //Zigzag scan order of the the Luma and Chroma components
 //Note: Jpeg Spec ISO/IEC 10918-1, Figure A.6 shows the zigzag order differently.
 //The Spec is trying to show the zigzag pattern with number positions. The below
 //table will use the patter shown by A.6 and map the postion of the elements in the array
 uint8_t jpeg_zigzag[] = {
     0,   1,   8,   16,  9,   2,   3,   10,
     17,  24,  32,  25,  18,  11,  4,   5,
     12,  19,  26,  33,  40,  48,  41,  34,
     27,  20,  13,  6,   7,   14,  21,  28,
     35,  42,  49,  56,  57,  50,  43,  36,
     29,  22,  15,  23,  30,  37,  44,  51,
     58,  59,  52,  45,  38,  31,  39,  46,
     53,  60,  61,  54,  47,  55,  62,  63
 };


 //Huffman table for Luminance DC Coefficients
 //Reference Jpeg Spec ISO/IEC 10918-1, K.3.3.1
 //K.3.3.1 is the summarized version of Table K.3
 uint8_t jpeg_hufftable_luma_dc[] = {
     //TcTh (Tc=0 since 0:DC, 1:AC; Th=0)
     0x00,
     //Li
     0x00, 0x01, 0x05, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     //Vi
     0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B
 };

 //Huffman table for Chrominance DC Coefficients
 //Reference Jpeg Spec ISO/IEC 10918-1, K.3.3.1
 //K.3.3.1 is the summarized version of Table K.4
 uint8_t jpeg_hufftable_chroma_dc[] = {
     //TcTh (Tc=0 since 0:DC, 1:AC; Th=1)
     0x01,
     //Li
     0x00, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
     //Vi
     0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B
 };


 //Huffman table for Luminance AC Coefficients
 //Reference Jpeg Spec ISO/IEC 10918-1, K.3.3.2
 //K.3.3.2 is the summarized version of Table K.5
 uint8_t jpeg_hufftable_luma_ac[] = {
     //TcTh (Tc=1 since 0:DC, 1:AC; Th=0)
     0x10,
     //Li
     0x00, 0x02, 0x01, 0x03, 0x03, 0x02, 0x04, 0x03, 0x05, 0x05, 0x04, 0x04, 0x00, 0x00, 0x01, 0x7D,
     //Vi
     0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
     0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xA1, 0x08, 0x23, 0x42, 0xB1, 0xC1, 0x15, 0x52, 0xD1, 0xF0,
     0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0A, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x25, 0x26, 0x27, 0x28,
     0x29, 0x2A, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
     0x4A, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
     0x6A, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
     0x8A, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7,
     0xA8, 0xA9, 0xAA, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xC2, 0xC3, 0xC4, 0xC5,
     0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xE1, 0xE2,
     0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8,
     0xF9, 0xFA
 };

 //Huffman table for Chrominance AC Coefficients
 //Reference Jpeg Spec ISO/IEC 10918-1, K.3.3.2
 //K.3.3.2 is the summarized version of Table K.6
 uint8_t jpeg_hufftable_chroma_ac[] = {
     //TcTh (Tc=1 since 0:DC, 1:AC; Th=1)
     0x11,
     //Li
     0x00, 0x02, 0x01, 0x02, 0x04, 0x04, 0x03, 0x04, 0x07, 0x05, 0x04, 0x04, 0x00, 0x01, 0x02, 0x77,
     //Vi
     0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21, 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
     0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91, 0xA1, 0xB1, 0xC1, 0x09, 0x23, 0x33, 0x52, 0xF0,
     0x15, 0x62, 0x72, 0xD1, 0x0A, 0x16, 0x24, 0x34, 0xE1, 0x25, 0xF1, 0x17, 0x18, 0x19, 0x1A, 0x26,
     0x27, 0x28, 0x29, 0x2A, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
     0x49, 0x4A, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
     0x69, 0x6A, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
     0x88, 0x89, 0x8A, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5,
     0xA6, 0xA7, 0xA8, 0xA9, 0xAA, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xC2, 0xC3,
     0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA,
     0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8,
     0xF9, 0xFA
 };

 typedef struct _YUVComponentSpecs {
     //One of 0(I420)/1(NV12)/2(UYVY)/3(YUY2)/4(Y8)/5(RGBA)>
     unsigned int yuv_type;
     // One of VA_RT_FORMAT_YUV420, VA_RT_FORMAT_YUV422, VA_RT_FORMAT_YUV400, VA_RT_FORMAT_YUV444, VA_RT_FORMAT_RGB32
     unsigned int va_surface_format;
     //One of VA_FOURCC_I420, VA_FOURCC_NV12, VA_FOURCC_UYVY, VA_FOURCC_YUY2, VA_FOURCC_Y800, VA_FOURCC_444P, VA_FOURCC_RGBA
     unsigned int fourcc_val; //Using this field to evaluate the input file type.
     //no.of. components
     unsigned int num_components;
     //Y horizontal subsample
     unsigned int y_h_subsample;
     //Y vertical subsample
     unsigned int y_v_subsample;
     //U horizontal subsample
     unsigned int u_h_subsample;
     //U vertical subsample
     unsigned int u_v_subsample;
     //V horizontal subsample
     unsigned int v_h_subsample;
     //V vertical subsample
     unsigned int v_v_subsample;
 } YUVComponentSpecs;
	/*
	* Copyright (c) 2014 Intel Corporation. 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 PRECISION INSIGHT 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.
	*/
	/*
	* This file is a utilities file which supports JPEG Encode process
	*/

	#include <sys/types.h>
	#include <stdio.h>

	#define MAX_JPEG_COMPONENTS 3 //only for Y, U and V
	#define JPEG_Y 0
	#define JPEG_U 1
	#define JPEG_V 2
	#define NUM_QUANT_ELEMENTS 64
	#define NUM_MAX_HUFFTABLE 2
	#define NUM_AC_RUN_SIZE_BITS 16
	#define NUM_AC_CODE_WORDS_HUFFVAL 162
	#define NUM_DC_RUN_SIZE_BITS 16
	#define NUM_DC_CODE_WORDS_HUFFVAL 12

	#define BITSTREAM_ALLOCATE_STEPPING 4096

	struct __bitstream {
	unsigned int *buffer;
	int bit_offset;
	int max_size_in_dword;
	};

	typedef struct __bitstream bitstream;

	static unsigned int
	swap32(unsigned int val)
	{
	unsigned char pval = (unsigned char )&val;

	return ((pval[0] << 24) \|
	(pval[1] << 16) \|
	(pval[2] << 8) \|
	(pval[3] << 0));
	}

	static void
	bitstream_start(bitstream *bs)
	{
	bs->max_size_in_dword = BITSTREAM_ALLOCATE_STEPPING;
	bs->buffer = calloc(bs->max_size_in_dword * sizeof(int), 1);
	assert(bs->buffer);
	bs->bit_offset = 0;
	}

	static void
	bitstream_end(bitstream *bs)
	{
	int pos = (bs->bit_offset >> 5);
	int bit_offset = (bs->bit_offset & 0x1f);
	int bit_left = 32 - bit_offset;

	if (bit_offset) {
	bs->buffer[pos] = swap32((bs->buffer[pos] << bit_left));
	}
	}

	static void
	bitstream_put_ui(bitstream *bs, unsigned int val, int size_in_bits)
	{
	int pos = (bs->bit_offset >> 5);
	int bit_offset = (bs->bit_offset & 0x1f);
	int bit_left = 32 - bit_offset;

	if (!size_in_bits)
	return;

	if (size_in_bits < 32)
	val &= ((1 << size_in_bits) - 1);

	bs->bit_offset += size_in_bits;

	if (bit_left > size_in_bits) {
	bs->buffer[pos] = (bs->buffer[pos] << size_in_bits \| val);
	} else {
	size_in_bits -= bit_left;
	bs->buffer[pos] = (bs->buffer[pos] << bit_left) \| (val >> size_in_bits);
	bs->buffer[pos] = swap32(bs->buffer[pos]);

	if (pos + 1 == bs->max_size_in_dword) {
	bs->max_size_in_dword += BITSTREAM_ALLOCATE_STEPPING;
	bs->buffer = realloc(bs->buffer, bs->max_size_in_dword * sizeof(unsigned int));
	assert(bs->buffer);
	}

	bs->buffer[pos + 1] = val;
	}
	}

	//As per Jpeg Spec ISO/IEC 10918-1, below values are assigned
	enum jpeg_markers {

	//Define JPEG markers as 0xFFXX if you are adding the value directly to the buffer
	//Else define marker as 0xXXFF if you are assigning the marker to a structure variable.
	//This is needed because of the little-endedness of the IA

	SOI = 0xFFD8, //Start of Image
	EOI = 0xFFD9, //End of Image
	SOS = 0xFFDA, //Start of Scan
	DQT = 0xFFDB, //Define Quantization Table
	DRI = 0xFFDD, //Define restart interval
	RST0 = 0xFFD0, //Restart interval termination
	DHT = 0xFFC4, //Huffman table
	SOF0 = 0xFFC0, //Baseline DCT
	APP0 = 0xFFE0, //Application Segment
	COM = 0xFFFE //Comment segment
	};

	typedef struct _JPEGFrameHeader {

	uint16_t SOF; //Start of Frame Header
	uint16_t Lf; //Length of Frame Header
	uint8_t P; //Sample precision
	uint16_t Y; //Number of lines
	uint16_t X; //Number of samples per line
	uint8_t Nf; //Number of image components in frame

	struct _JPEGComponent {
	uint8_t Ci; //Component identifier
	uint8_t Hi: 4; //Horizontal sampling factor
	uint8_t Vi: 4; //Vertical sampling factor
	uint8_t Tqi; //Quantization table destination selector
	} JPEGComponent[MAX_JPEG_COMPONENTS];

	} JPEGFrameHeader;


	typedef struct _JPEGScanHeader {

	uint16_t SOS; //Start of Scan
	uint16_t Ls; //Length of Scan
	uint8_t Ns; //Number of image components in the scan

	struct _ScanComponent {
	uint8_t Csj; //Scan component selector
	uint8_t Tdj: 4; //DC Entropy coding table destination selector(Tdj:4 bits)
	uint8_t Taj: 4; //AC Entropy coding table destination selector(Taj:4 bits)
	} ScanComponent[MAX_JPEG_COMPONENTS];

	uint8_t Ss; //Start of spectral or predictor selection, 0 for Baseline
	uint8_t Se; //End of spectral or predictor selection, 63 for Baseline
	uint8_t Ah: 4; //Successive approximation bit position high, 0 for Baseline
	uint8_t Al: 4; //Successive approximation bit position low, 0 for Baseline

	} JPEGScanHeader;


	typedef struct _JPEGQuantSection {

	uint16_t DQT; //Quantization table marker
	uint16_t Lq; //Length of Quantization table definition
	uint8_t Tq: 4; //Quantization table destination identifier
	uint8_t Pq: 4; //Quatization table precision. Should be 0 for 8-bit samples
	uint8_t Qk[NUM_QUANT_ELEMENTS]; //Quantization table elements

	} JPEGQuantSection;

	typedef struct _JPEGHuffSection {

	uint16_t DHT; //Huffman table marker
	uint16_t Lh; //Huffman table definition length
	uint8_t Tc: 4; //Table class- 0:DC, 1:AC
	uint8_t Th: 4; //Huffman table destination identifier
	uint8_t Li[NUM_AC_RUN_SIZE_BITS]; //Number of Huffman codes of length i
	uint8_t Vij[NUM_AC_CODE_WORDS_HUFFVAL]; //Value associated with each Huffman code

	} JPEGHuffSection;


	typedef struct _JPEGRestartSection {

	uint16_t DRI; //Restart interval marker
	uint16_t Lr; //Legth of restart interval segment
	uint16_t Ri; //Restart interval

	} JPEGRestartSection;


	typedef struct _JPEGCommentSection {

	uint16_t COM; //Comment marker
	uint16_t Lc; //Comment segment length
	uint8_t Cmi; //Comment byte

	} JPEGCommentSection;


	typedef struct _JPEGAppSection {

	uint16_t APPn; //Application data marker
	uint16_t Lp; //Application data segment length
	uint8_t Api; //Application data byte

	} JPEGAppSection;

	//Luminance quantization table
	//Source: Jpeg Spec ISO/IEC 10918-1, Annex K, Table K.1
	uint8_t jpeg_luma_quant[NUM_QUANT_ELEMENTS] = {
	16, 11, 10, 16, 24, 40, 51, 61,
	12, 12, 14, 19, 26, 58, 60, 55,
	14, 13, 16, 24, 40, 57, 69, 56,
	14, 17, 22, 29, 51, 87, 80, 62,
	18, 22, 37, 56, 68, 109, 103, 77,
	24, 35, 55, 64, 81, 104, 113, 92,
	49, 64, 78, 87, 103, 121, 120, 101,
	72, 92, 95, 98, 112, 100, 103, 99
	};

	//Luminance quantization table
	//Source: Jpeg Spec ISO/IEC 10918-1, Annex K, Table K.2
	uint8_t jpeg_chroma_quant[NUM_QUANT_ELEMENTS] = {
	17, 18, 24, 47, 99, 99, 99, 99,
	18, 21, 26, 66, 99, 99, 99, 99,
	24, 26, 56, 99, 99, 99, 99, 99,
	47, 66, 99, 99, 99, 99, 99, 99,
	99, 99, 99, 99, 99, 99, 99, 99,
	99, 99, 99, 99, 99, 99, 99, 99,
	99, 99, 99, 99, 99, 99, 99, 99,
	99, 99, 99, 99, 99, 99, 99, 99
	};


	//Zigzag scan order of the the Luma and Chroma components
	//Note: Jpeg Spec ISO/IEC 10918-1, Figure A.6 shows the zigzag order differently.
	//The Spec is trying to show the zigzag pattern with number positions. The below
	//table will use the patter shown by A.6 and map the postion of the elements in the array
	uint8_t jpeg_zigzag[] = {
	0, 1, 8, 16, 9, 2, 3, 10,
	17, 24, 32, 25, 18, 11, 4, 5,
	12, 19, 26, 33, 40, 48, 41, 34,
	27, 20, 13, 6, 7, 14, 21, 28,
	35, 42, 49, 56, 57, 50, 43, 36,
	29, 22, 15, 23, 30, 37, 44, 51,
	58, 59, 52, 45, 38, 31, 39, 46,
	53, 60, 61, 54, 47, 55, 62, 63
	};


	//Huffman table for Luminance DC Coefficients
	//Reference Jpeg Spec ISO/IEC 10918-1, K.3.3.1
	//K.3.3.1 is the summarized version of Table K.3
	uint8_t jpeg_hufftable_luma_dc[] = {
	//TcTh (Tc=0 since 0:DC, 1:AC; Th=0)
	0x00,
	//Li
	0x00, 0x01, 0x05, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	//Vi
	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B
	};

	//Huffman table for Chrominance DC Coefficients
	//Reference Jpeg Spec ISO/IEC 10918-1, K.3.3.1
	//K.3.3.1 is the summarized version of Table K.4
	uint8_t jpeg_hufftable_chroma_dc[] = {
	//TcTh (Tc=0 since 0:DC, 1:AC; Th=1)
	0x01,
	//Li
	0x00, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
	//Vi
	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B
	};


	//Huffman table for Luminance AC Coefficients
	//Reference Jpeg Spec ISO/IEC 10918-1, K.3.3.2
	//K.3.3.2 is the summarized version of Table K.5
	uint8_t jpeg_hufftable_luma_ac[] = {
	//TcTh (Tc=1 since 0:DC, 1:AC; Th=0)
	0x10,
	//Li
	0x00, 0x02, 0x01, 0x03, 0x03, 0x02, 0x04, 0x03, 0x05, 0x05, 0x04, 0x04, 0x00, 0x00, 0x01, 0x7D,
	//Vi
	0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
	0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xA1, 0x08, 0x23, 0x42, 0xB1, 0xC1, 0x15, 0x52, 0xD1, 0xF0,
	0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0A, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x25, 0x26, 0x27, 0x28,
	0x29, 0x2A, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
	0x4A, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
	0x6A, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
	0x8A, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7,
	0xA8, 0xA9, 0xAA, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xC2, 0xC3, 0xC4, 0xC5,
	0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xE1, 0xE2,
	0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8,
	0xF9, 0xFA
	};

	//Huffman table for Chrominance AC Coefficients
	//Reference Jpeg Spec ISO/IEC 10918-1, K.3.3.2
	//K.3.3.2 is the summarized version of Table K.6
	uint8_t jpeg_hufftable_chroma_ac[] = {
	//TcTh (Tc=1 since 0:DC, 1:AC; Th=1)
	0x11,
	//Li
	0x00, 0x02, 0x01, 0x02, 0x04, 0x04, 0x03, 0x04, 0x07, 0x05, 0x04, 0x04, 0x00, 0x01, 0x02, 0x77,
	//Vi
	0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21, 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
	0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91, 0xA1, 0xB1, 0xC1, 0x09, 0x23, 0x33, 0x52, 0xF0,
	0x15, 0x62, 0x72, 0xD1, 0x0A, 0x16, 0x24, 0x34, 0xE1, 0x25, 0xF1, 0x17, 0x18, 0x19, 0x1A, 0x26,
	0x27, 0x28, 0x29, 0x2A, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
	0x49, 0x4A, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
	0x69, 0x6A, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
	0x88, 0x89, 0x8A, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5,
	0xA6, 0xA7, 0xA8, 0xA9, 0xAA, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xC2, 0xC3,
	0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA,
	0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8,
	0xF9, 0xFA
	};

	typedef struct _YUVComponentSpecs {
	//One of 0(I420)/1(NV12)/2(UYVY)/3(YUY2)/4(Y8)/5(RGBA)>
	unsigned int yuv_type;
	// One of VA_RT_FORMAT_YUV420, VA_RT_FORMAT_YUV422, VA_RT_FORMAT_YUV400, VA_RT_FORMAT_YUV444, VA_RT_FORMAT_RGB32
	unsigned int va_surface_format;
	//One of VA_FOURCC_I420, VA_FOURCC_NV12, VA_FOURCC_UYVY, VA_FOURCC_YUY2, VA_FOURCC_Y800, VA_FOURCC_444P, VA_FOURCC_RGBA
	unsigned int fourcc_val; //Using this field to evaluate the input file type.
	//no.of. components
	unsigned int num_components;
	//Y horizontal subsample
	unsigned int y_h_subsample;
	//Y vertical subsample
	unsigned int y_v_subsample;
	//U horizontal subsample
	unsigned int u_h_subsample;
	//U vertical subsample
	unsigned int u_v_subsample;
	//V horizontal subsample
	unsigned int v_h_subsample;
	//V vertical subsample
	unsigned int v_v_subsample;
	} YUVComponentSpecs;