decode.c File Reference

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Functions
void	ChenIDct (int *x, int *y)
void	IZigzagMatrix (int *imatrix, int *omatrix)
void	IQuantize (int *matrix, int *qmatrix)
void	PostshiftIDctMatrix (int *matrix, int shift)
void	BoundIDctMatrix (int *matrix, int Bound)
void	WriteOneBlock (int *store, char *out_buf, int width, int height, int voffs, int hoffs)
void	WriteBlock (int *store, int *p_out_vpos, int *p_out_hpos, unsigned char *p_out_buf)
void	Write4Blocks (int *store1, int *store2, int *store3, int *store4, int *p_out_vpos, int *p_out_hpos, unsigned char *p_out_buf)
void	YuvToRgb (int p, int *y_buf, int *u_buf, int *v_buf)
void	decode_block (int comp_no, int *out_buf, int *HuffBuff)
void	decode_start (int *out_data_image_width, int *out_data_image_height, int *out_data_comp_vpos, int *out_data_comp_hpos)

Variables
int	rgb_buf [4][RGB_NUM][DCTSIZE2]
const int	zigzag_index [64]

Function Documentation

BoundIDctMatrix()

void BoundIDctMatrix	(	int *	matrix,
		int	Bound
	)

Definition at line 123 of file decode.c.

References DCTSIZE2.

ChenIDct()

void ChenIDct	(	int *	x,
		int *	y
	)

Definition at line 79 of file chenidct.c.

References a0, a1, a2, a3, b0, b1, b2, c0, c1, c1d16, c1d4, c1d8, c2, c3d16, c3d8, c5d16, c7d16, LS, and MSCALE.

decode_block()

void decode_block	(	int	comp_no,
		int *	out_buf,
		int *	HuffBuff
	)

Definition at line 329 of file decode.c.

References BoundIDctMatrix(), ChenIDct(), DCTSIZE2, DecodeHuffMCU(), IDCT_BOUNT, IDCT_SHIFT, IQuantize(), IZigzagMatrix(), p_jinfo_comps_info_quant_tbl_no, p_jinfo_quant_tbl_quantval, and PostshiftIDctMatrix().

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decode_start()

void decode_start	(	int *	out_data_image_width,
		int *	out_data_image_height,
		int *	out_data_comp_vpos,
		int *	out_data_comp_hpos
	)

Definition at line 352 of file decode.c.

References CurHuffReadBuf, DCTSIZE2, decode_block(), NUM_COMPONENT, OutData_comp_buf, p_jinfo_image_height, p_jinfo_image_width, p_jinfo_jpeg_data, p_jinfo_NumMCU, p_jinfo_smp_fact, rgb_buf, RGB_NUM, SF1_1_1, Write4Blocks(), WriteBlock(), and YuvToRgb().

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IQuantize()

void IQuantize	(	int *	matrix,
		int *	qmatrix
	)

Definition at line 91 of file decode.c.

References DCTSIZE2.

IZigzagMatrix()

void IZigzagMatrix	(	int *	imatrix,
		int *	omatrix
	)

Definition at line 72 of file decode.c.

References DCTSIZE2, and zigzag_index.

PostshiftIDctMatrix()

void PostshiftIDctMatrix	(	int *	matrix,
		int	shift
	)

Definition at line 108 of file decode.c.

References DCTSIZE2.

Write4Blocks()

void Write4Blocks	(	int *	store1,
		int *	store2,
		int *	store3,
		int *	store4,
		int *	p_out_vpos,
		int *	p_out_hpos,
		unsigned char *	p_out_buf
	)

Definition at line 223 of file decode.c.

References DCTSIZE, p_jinfo_image_height, p_jinfo_image_width, p_jinfo_MCUWidth, and WriteOneBlock().

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WriteBlock()

void WriteBlock	(	int *	store,
		int *	p_out_vpos,
		int *	p_out_hpos,
		unsigned char *	p_out_buf
	)

Definition at line 185 of file decode.c.

References DCTSIZE, p_jinfo_image_height, p_jinfo_image_width, p_jinfo_MCUWidth, and WriteOneBlock().

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WriteOneBlock()

void WriteOneBlock	(	int *	store,
		char *	out_buf,
		int	width,
		int	height,
		int	voffs,
		int	hoffs
	)

Definition at line 143 of file decode.c.

References DCTSIZE.

YuvToRgb()

void YuvToRgb	(	int	p,
		int *	y_buf,
		int *	u_buf,
		int *	v_buf
	)

Definition at line 286 of file decode.c.

References DCTSIZE2, and rgb_buf.

Variable Documentation

rgb_buf

int rgb_buf[4][RGB_NUM][DCTSIZE2]

Definition at line 53 of file decode.c.

zigzag_index

const int zigzag_index[64]

Initial value:

=       
{ 0, 1, 5, 6, 14, 15, 27, 28,
  2, 4, 7, 13, 16, 26, 29, 42,
  3, 8, 12, 17, 25, 30, 41, 43,
  9, 11, 18, 24, 31, 40, 44, 53,
  10, 19, 23, 32, 39, 45, 52, 54,
  20, 22, 33, 38, 46, 51, 55, 60,
  21, 34, 37, 47, 50, 56, 59, 61,
  35, 36, 48, 49, 57, 58, 62, 63
}

Definition at line 55 of file decode.c.