mp3dct32.c 文件参考

#include "mp3coder.h"
#include "mp3assembly.h"

宏定义
#define	COS0_0   0x4013c251 /* Q31 */
#define	COS0_1   0x40b345bd /* Q31 */
#define	COS0_2   0x41fa2d6d /* Q31 */
#define	COS0_3   0x43f93421 /* Q31 */
#define	COS0_4   0x46cc1bc4 /* Q31 */
#define	COS0_5   0x4a9d9cf0 /* Q31 */
#define	COS0_6   0x4fae3711 /* Q31 */
#define	COS0_7   0x56601ea7 /* Q31 */
#define	COS0_8   0x5f4cf6eb /* Q31 */
#define	COS0_9   0x6b6fcf26 /* Q31 */
#define	COS0_10   0x7c7d1db3 /* Q31 */
#define	COS0_11   0x4ad81a97 /* Q30 */
#define	COS0_12   0x5efc8d96 /* Q30 */
#define	COS0_13   0x41d95790 /* Q29 */
#define	COS0_14   0x6d0b20cf /* Q29 */
#define	COS0_15   0x518522fb /* Q27 */
#define	COS1_0   0x404f4672 /* Q31 */
#define	COS1_1   0x42e13c10 /* Q31 */
#define	COS1_2   0x48919f44 /* Q31 */
#define	COS1_3   0x52cb0e63 /* Q31 */
#define	COS1_4   0x64e2402e /* Q31 */
#define	COS1_5   0x43e224a9 /* Q30 */
#define	COS1_6   0x6e3c92c1 /* Q30 */
#define	COS1_7   0x519e4e04 /* Q28 */
#define	COS2_0   0x4140fb46 /* Q31 */
#define	COS2_1   0x4cf8de88 /* Q31 */
#define	COS2_2   0x73326bbf /* Q31 */
#define	COS2_3   0x52036742 /* Q29 */
#define	COS3_0   0x4545e9ef /* Q31 */
#define	COS3_1   0x539eba45 /* Q30 */
#define	COS4_0   0x5a82799a /* Q31 */
#define	D32FP(i, s0, s1, s2)

函数
_XIF_ void STATNAME()	FDCT32 (int *buf, int *dest, int offset, int oddBlock, int gb)

变量
static _DIF_ const int	dcttab [48]

宏定义说明

COS0_0

#define COS0_0   0x4013c251 /* Q31 */

COS0_1

#define COS0_1   0x40b345bd /* Q31 */

COS0_10

#define COS0_10   0x7c7d1db3 /* Q31 */

COS0_11

#define COS0_11   0x4ad81a97 /* Q30 */

COS0_12

#define COS0_12   0x5efc8d96 /* Q30 */

COS0_13

#define COS0_13   0x41d95790 /* Q29 */

COS0_14

#define COS0_14   0x6d0b20cf /* Q29 */

COS0_15

#define COS0_15   0x518522fb /* Q27 */

COS0_2

#define COS0_2   0x41fa2d6d /* Q31 */

COS0_3

#define COS0_3   0x43f93421 /* Q31 */

COS0_4

#define COS0_4   0x46cc1bc4 /* Q31 */

COS0_5

#define COS0_5   0x4a9d9cf0 /* Q31 */

COS0_6

#define COS0_6   0x4fae3711 /* Q31 */

COS0_7

#define COS0_7   0x56601ea7 /* Q31 */

COS0_8

#define COS0_8   0x5f4cf6eb /* Q31 */

COS0_9

#define COS0_9   0x6b6fcf26 /* Q31 */

COS1_0

#define COS1_0   0x404f4672 /* Q31 */

COS1_1

#define COS1_1   0x42e13c10 /* Q31 */

COS1_2

#define COS1_2   0x48919f44 /* Q31 */

COS1_3

#define COS1_3   0x52cb0e63 /* Q31 */

COS1_4

#define COS1_4   0x64e2402e /* Q31 */

COS1_5

#define COS1_5   0x43e224a9 /* Q30 */

COS1_6

#define COS1_6   0x6e3c92c1 /* Q30 */

COS1_7

#define COS1_7   0x519e4e04 /* Q28 */

COS2_0

#define COS2_0   0x4140fb46 /* Q31 */

COS2_1

#define COS2_1   0x4cf8de88 /* Q31 */

COS2_2

#define COS2_2   0x73326bbf /* Q31 */

COS2_3

#define COS2_3   0x52036742 /* Q29 */

COS3_0

#define COS3_0   0x4545e9ef /* Q31 */

COS3_1

#define COS3_1   0x539eba45 /* Q30 */

COS4_0

#define COS4_0   0x5a82799a /* Q31 */

D32FP

#define D32FP	(		i,
			s0,
			s1,
			s2
	)

值:

{ \
    a0 = buf[i];            a3 = buf[31-i]; \
    a1 = buf[15-i];         a2 = buf[16+i]; \
    b0 = a0 + a3;           b3 = MULSHIFT32(*cptr++, a0 - a3) << (s0);  \
    b1 = a1 + a2;           b2 = MULSHIFT32(*cptr++, a1 - a2) << (s1);  \
    buf[i] = b0 + b1;       buf[15-i] = MULSHIFT32(*cptr,   b0 - b1) << (s2); \
    buf[16+i] = b2 + b3;    buf[31-i] = MULSHIFT32(*cptr++, b3 - b2) << (s2); \
}

函数说明

FDCT32()

_XIF_ void STATNAME() FDCT32	(	int *	buf,
		int *	dest,
		int	offset,
		int	oddBlock,
		int	gb
	)

变量说明

dcttab

_DIF_ const int dcttab[48]

static

初始值:

= {
    
     0x4013c251  ,  0x518522fb  ,  0x404f4672  ,    
     0x40b345bd  ,  0x6d0b20cf  ,  0x42e13c10  ,    
     0x41fa2d6d  ,  0x41d95790  ,  0x48919f44  ,    
     0x43f93421  ,  0x5efc8d96  ,  0x52cb0e63  ,    
     0x46cc1bc4  ,  0x4ad81a97  ,  0x64e2402e  ,    
     0x4a9d9cf0  ,  0x7c7d1db3  ,  0x43e224a9  ,    
     0x4fae3711  ,  0x6b6fcf26  ,   0x6e3c92c1  ,   
     0x56601ea7  ,  0x5f4cf6eb  ,   0x519e4e04  ,   
    
      0x4140fb46  ,   0x52036742  ,  0x4545e9ef  ,  
      0x4cf8de88  ,   0x73326bbf  ,  0x539eba45  ,  
    - 0x4140fb46  , - 0x52036742  ,  0x4545e9ef  ,  
    - 0x4cf8de88  , - 0x73326bbf  ,  0x539eba45  ,  
      0x4140fb46  ,   0x52036742  ,  0x4545e9ef  ,  
      0x4cf8de88  ,   0x73326bbf  ,  0x539eba45  ,  
    - 0x4140fb46  , - 0x52036742  ,  0x4545e9ef  ,  
    - 0x4cf8de88  , - 0x73326bbf  ,  0x539eba45  ,  
}