sw_jpeg_decoder.h

MTK平台绝密核心代码之 多媒体处理

/*****************************************************************************
*  Copyright Statement:
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*  herein is confidential. The software may not be copied and the information
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/*****************************************************************************
 *
 * Filename:
 * ---------
 *   sw_jpeg_decoder.h
 *
 *
 * Description:
 * ------------
 *   header file of software jpeg decoder code
 *
 * Author:
 * -------
 * -------
 *
 *============================================================================
 *             HISTORY
 * Below this line, this part is controlled by PVCS VM. DO NOT MODIFY!!
 *------------------------------------------------------------------------------
 * removed!
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 * removed!
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 *
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 *
 * removed!
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 *------------------------------------------------------------------------------
 * Upper this line, this part is controlled by PVCS VM. DO NOT MODIFY!!
 *============================================================================
 *****************************************************************************/
#if(defined __SW_JPEG_CODEC_SUPPORT__ || !defined(__MTK_TARGET__))

#ifndef __SW_JPEG_DECODER_H__
#define __SW_JPEG_DECODER_H__

#define RESIZER_SCALE_BITS	20

#define JPEG_FORMAT_444	0
#define JPEG_FORMAT_422	1
#define JPEG_FORMAT_420	2

typedef struct
{
  	kal_uint8 bits[17];		/* bits[k] = # of symbols with codes of */
  	kal_uint8 huffman_value[256];		/* The symbols, in order of incr code length */
	kal_uint8 huffman_table_count;
} huffman_table_struct;

typedef struct
{
	kal_int16 component_id;
	kal_int16 component_index;
	kal_int16 h_samp_factor;
	kal_int16 v_samp_factor;
	kal_int16 quant_table_num;
	kal_int16 dc_table_num;
	kal_int16 ac_table_num;
	kal_bool component_needed;
	kal_uint8 idct_loop_counter;
	kal_uint8 idct_h_increase;
	kal_uint8 idct_v_increase;
} component_info;

#define HUFF_LOOKAHEAD	8
typedef struct
{
	kal_int32 maxcode[18];
	kal_int32 valoffset[17];
	huffman_table_struct *pub;
	kal_int16 look_nbits[256];
	kal_uint8 look_sym[256];
} d_derived_table;


#define BIT_BUF_SIZE  32	/* size of buffer in bits */

#define MIN_GET_BITS  (BIT_BUF_SIZE-7)

#define HUFF_DECODE(result, vld_buffer, bits_left, htbl, slowlabel) \
{ kal_uint32 nb, look; \
  if (bits_left < HUFF_LOOKAHEAD) \
  { \
    fill_bit_buffer (&vld_buffer, &bits_left, 0); \
    if (bits_left < HUFF_LOOKAHEAD) \
    { \
      nb = 1; goto slowlabel; \
    } \
  } \
  look = (unsigned char) (vld_buffer>>(bits_left-HUFF_LOOKAHEAD)); \
  if ((nb = htbl->look_nbits[look]) != 0) \
  { \
    DROP_BITS(vld_buffer, bits_left, nb); \
    result = htbl->look_sym[look]; \
  } else { \
    nb = HUFF_LOOKAHEAD+1; \
slowlabel: \
    result = jpeg_huff_decode (&vld_buffer, &bits_left, htbl, nb); } \
}

#define GET_BITS(vld_buffer, bits_left, min_bits) \
	(((kal_int16) (vld_buffer >> (bits_left -= (min_bits)))) & ((1<<(min_bits))-1))

#define PEEK_BITS(vld_buffer, bits_left, min_bits) \
	(((unsigned char) (vld_buffer >> (bits_left -  (min_bits)))))

#define DROP_BITS(vld_buffer, bits_left, min_bits) \
	(bits_left -= (min_bits))

#define CHECK_BIT_BUFFER(vld_buffer, bits_left, nbits) \
 	{ if (bits_left < (nbits)) { \
        fill_bit_buffer (&vld_buffer, &bits_left, nbits); }}

typedef struct
{
  kal_uint16 EOBRUN;			/* remaining EOBs in EOBRUN */
  kal_int16 last_dc_val[4];	/* last DC coef for each component */
} savable_state;


typedef struct
{
  kal_bool insufficient_data;	/* set TRUE after emitting warning */
  kal_int32 vld_buffer;	/* current bit-extraction buffer */
  kal_uint16 bits_left;		/* # of unused bits in it */
  savable_state saved;		/* Other state at start of MCU */
  kal_uint16 restarts_to_go;	/* MCUs left in this restart interval */

  d_derived_table dc_derived_tables[4];
  d_derived_table ac_derived_tables[4];
  d_derived_table derived_tables[4];

  d_derived_table * dc_cur_tables[10];
  d_derived_table * ac_cur_tables[10];
  d_derived_table * ac_derived_table; /* active table during an AC scan */
  kal_bool dc_needed[10];
  kal_bool ac_needed[10];
} huff_entropy_decoder;

typedef huff_entropy_decoder *huff_entropy_ptr;

kal_uint8 sw_jpeg_decode(kal_uint32 file_handle);
#endif /*__SW_JPEG_DECODER_H__*/
#endif /* __SW_JPEG_CODEC_SUPPORT__ !__MTK_TARGET__*/