[deb_ffmpeg.git] / ffmpeg / libavcodec / faandct.c

/*
 * Floating point AAN DCT
 * this implementation is based upon the IJG integer AAN DCT (see jfdctfst.c)
 *
 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
 * Copyright (c) 2003 Roman Shaposhnik
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/**
 * @file
 * @brief
 *     Floating point AAN DCT
 * @author Michael Niedermayer <michaelni@gmx.at>
 */

#include "faandct.h"
#include "libavutil/internal.h"
#include "libavutil/libm.h"

#define FLOAT float

//numbers generated by simple c code (not as accurate as they could be)
/*
for(i=0; i<8; i++){
    printf("#define B%d %1.20llf\n", i, (long double)1.0/(cosl(i*acosl(-1.0)/(long double)16.0)*sqrtl(2)));
}
*/
#define B0 1.00000000000000000000
#define B1 0.72095982200694791383 // (cos(pi*1/16)sqrt(2))^-1
#define B2 0.76536686473017954350 // (cos(pi*2/16)sqrt(2))^-1
#define B3 0.85043009476725644878 // (cos(pi*3/16)sqrt(2))^-1
#define B4 1.00000000000000000000 // (cos(pi*4/16)sqrt(2))^-1
#define B5 1.27275858057283393842 // (cos(pi*5/16)sqrt(2))^-1
#define B6 1.84775906502257351242 // (cos(pi*6/16)sqrt(2))^-1
#define B7 3.62450978541155137218 // (cos(pi*7/16)sqrt(2))^-1


#define A1 0.70710678118654752438 // cos(pi*4/16)
#define A2 0.54119610014619698435 // cos(pi*6/16)sqrt(2)
#define A5 0.38268343236508977170 // cos(pi*6/16)
#define A4 1.30656296487637652774 // cos(pi*2/16)sqrt(2)

static const FLOAT postscale[64]={
B0*B0, B0*B1, B0*B2, B0*B3, B0*B4, B0*B5, B0*B6, B0*B7,
B1*B0, B1*B1, B1*B2, B1*B3, B1*B4, B1*B5, B1*B6, B1*B7,
B2*B0, B2*B1, B2*B2, B2*B3, B2*B4, B2*B5, B2*B6, B2*B7,
B3*B0, B3*B1, B3*B2, B3*B3, B3*B4, B3*B5, B3*B6, B3*B7,
B4*B0, B4*B1, B4*B2, B4*B3, B4*B4, B4*B5, B4*B6, B4*B7,
B5*B0, B5*B1, B5*B2, B5*B3, B5*B4, B5*B5, B5*B6, B5*B7,
B6*B0, B6*B1, B6*B2, B6*B3, B6*B4, B6*B5, B6*B6, B6*B7,
B7*B0, B7*B1, B7*B2, B7*B3, B7*B4, B7*B5, B7*B6, B7*B7,
};

static av_always_inline void row_fdct(FLOAT temp[64], int16_t *data)
{
    FLOAT tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
    FLOAT tmp10, tmp11, tmp12, tmp13;
    FLOAT z2, z4, z11, z13;
    int i;

    for (i=0; i<8*8; i+=8) {
        tmp0= data[0 + i] + data[7 + i];
        tmp7= data[0 + i] - data[7 + i];
        tmp1= data[1 + i] + data[6 + i];
        tmp6= data[1 + i] - data[6 + i];
        tmp2= data[2 + i] + data[5 + i];
        tmp5= data[2 + i] - data[5 + i];
        tmp3= data[3 + i] + data[4 + i];
        tmp4= data[3 + i] - data[4 + i];

        tmp10= tmp0 + tmp3;
        tmp13= tmp0 - tmp3;
        tmp11= tmp1 + tmp2;
        tmp12= tmp1 - tmp2;

        temp[0 + i]= tmp10 + tmp11;
        temp[4 + i]= tmp10 - tmp11;

        tmp12 += tmp13;
        tmp12 *= A1;
        temp[2 + i]= tmp13 + tmp12;
        temp[6 + i]= tmp13 - tmp12;

        tmp4 += tmp5;
        tmp5 += tmp6;
        tmp6 += tmp7;

#if 0
        {
            FLOAT z5;
            z5 = (tmp4 - tmp6) * A5;
            z2 =  tmp4         * A2 + z5;
            z4 =  tmp6         * A4 + z5;
        }
#else
        z2= tmp4*(A2+A5) - tmp6*A5;
        z4= tmp6*(A4-A5) + tmp4*A5;
#endif
        tmp5*=A1;

        z11= tmp7 + tmp5;
        z13= tmp7 - tmp5;

        temp[5 + i]= z13 + z2;
        temp[3 + i]= z13 - z2;
        temp[1 + i]= z11 + z4;
        temp[7 + i]= z11 - z4;
    }
}

void ff_faandct(int16_t *data)
{
    FLOAT tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
    FLOAT tmp10, tmp11, tmp12, tmp13;
    FLOAT z2, z4, z11, z13;
    FLOAT temp[64];
    int i;

    emms_c();

    row_fdct(temp, data);

    for (i=0; i<8; i++) {
        tmp0= temp[8*0 + i] + temp[8*7 + i];
        tmp7= temp[8*0 + i] - temp[8*7 + i];
        tmp1= temp[8*1 + i] + temp[8*6 + i];
        tmp6= temp[8*1 + i] - temp[8*6 + i];
        tmp2= temp[8*2 + i] + temp[8*5 + i];
        tmp5= temp[8*2 + i] - temp[8*5 + i];
        tmp3= temp[8*3 + i] + temp[8*4 + i];
        tmp4= temp[8*3 + i] - temp[8*4 + i];

        tmp10= tmp0 + tmp3;
        tmp13= tmp0 - tmp3;
        tmp11= tmp1 + tmp2;
        tmp12= tmp1 - tmp2;

        data[8*0 + i]= lrintf(postscale[8*0 + i] * (tmp10 + tmp11));
        data[8*4 + i]= lrintf(postscale[8*4 + i] * (tmp10 - tmp11));

        tmp12 += tmp13;
        tmp12 *= A1;
        data[8*2 + i]= lrintf(postscale[8*2 + i] * (tmp13 + tmp12));
        data[8*6 + i]= lrintf(postscale[8*6 + i] * (tmp13 - tmp12));

        tmp4 += tmp5;
        tmp5 += tmp6;
        tmp6 += tmp7;

#if 0
        {
            FLOAT z5;
            z5 = (tmp4 - tmp6) * A5;
            z2 =  tmp4         * A2 + z5;
            z4 =  tmp6         * A4 + z5;
        }
#else
        z2= tmp4*(A2+A5) - tmp6*A5;
        z4= tmp6*(A4-A5) + tmp4*A5;
#endif
        tmp5*=A1;

        z11= tmp7 + tmp5;
        z13= tmp7 - tmp5;

        data[8*5 + i]= lrintf(postscale[8*5 + i] * (z13 + z2));
        data[8*3 + i]= lrintf(postscale[8*3 + i] * (z13 - z2));
        data[8*1 + i]= lrintf(postscale[8*1 + i] * (z11 + z4));
        data[8*7 + i]= lrintf(postscale[8*7 + i] * (z11 - z4));
    }
}

void ff_faandct248(int16_t *data)
{
    FLOAT tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
    FLOAT tmp10, tmp11, tmp12, tmp13;
    FLOAT temp[64];
    int i;

    emms_c();

    row_fdct(temp, data);

    for (i=0; i<8; i++) {
        tmp0 = temp[8*0 + i] + temp[8*1 + i];
        tmp1 = temp[8*2 + i] + temp[8*3 + i];
        tmp2 = temp[8*4 + i] + temp[8*5 + i];
        tmp3 = temp[8*6 + i] + temp[8*7 + i];
        tmp4 = temp[8*0 + i] - temp[8*1 + i];
        tmp5 = temp[8*2 + i] - temp[8*3 + i];
        tmp6 = temp[8*4 + i] - temp[8*5 + i];
        tmp7 = temp[8*6 + i] - temp[8*7 + i];

        tmp10 = tmp0 + tmp3;
        tmp11 = tmp1 + tmp2;
        tmp12 = tmp1 - tmp2;
        tmp13 = tmp0 - tmp3;

        data[8*0 + i] = lrintf(postscale[8*0 + i] * (tmp10 + tmp11));
        data[8*4 + i] = lrintf(postscale[8*4 + i] * (tmp10 - tmp11));

        tmp12 += tmp13;
        tmp12 *= A1;
        data[8*2 + i] = lrintf(postscale[8*2 + i] * (tmp13 + tmp12));
        data[8*6 + i] = lrintf(postscale[8*6 + i] * (tmp13 - tmp12));

        tmp10 = tmp4 + tmp7;
        tmp11 = tmp5 + tmp6;
        tmp12 = tmp5 - tmp6;
        tmp13 = tmp4 - tmp7;

        data[8*1 + i] = lrintf(postscale[8*0 + i] * (tmp10 + tmp11));
        data[8*5 + i] = lrintf(postscale[8*4 + i] * (tmp10 - tmp11));

        tmp12 += tmp13;
        tmp12 *= A1;
        data[8*3 + i] = lrintf(postscale[8*2 + i] * (tmp13 + tmp12));
        data[8*7 + i] = lrintf(postscale[8*6 + i] * (tmp13 - tmp12));
    }
}
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* Floating point AAN DCT
	3	* this implementation is based upon the IJG integer AAN DCT (see jfdctfst.c)
	4	*
	5	* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
	6	* Copyright (c) 2003 Roman Shaposhnik
	7	*
	8	* Permission to use, copy, modify, and/or distribute this software for any
	9	* purpose with or without fee is hereby granted, provided that the above
	10	* copyright notice and this permission notice appear in all copies.
	11	*
	12	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	13	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	14	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	15	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	16	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	17	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
	18	* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	19	*/
	20
	21	/**
	22	* @file
	23	* @brief
	24	* Floating point AAN DCT
	25	* @author Michael Niedermayer <michaelni@gmx.at>
	26	*/
	27
	28	#include "faandct.h"
	29	#include "libavutil/internal.h"
	30	#include "libavutil/libm.h"
	31
	32	#define FLOAT float
	33
	34	//numbers generated by simple c code (not as accurate as they could be)
	35	/*
	36	for(i=0; i<8; i++){
	37	printf("#define B%d %1.20llf\n", i, (long double)1.0/(cosl(iacosl(-1.0)/(long double)16.0)sqrtl(2)));
	38	}
	39	*/
	40	#define B0 1.00000000000000000000
	41	#define B1 0.72095982200694791383 // (cos(pi*1/16)sqrt(2))^-1
	42	#define B2 0.76536686473017954350 // (cos(pi*2/16)sqrt(2))^-1
	43	#define B3 0.85043009476725644878 // (cos(pi*3/16)sqrt(2))^-1
	44	#define B4 1.00000000000000000000 // (cos(pi*4/16)sqrt(2))^-1
	45	#define B5 1.27275858057283393842 // (cos(pi*5/16)sqrt(2))^-1
	46	#define B6 1.84775906502257351242 // (cos(pi*6/16)sqrt(2))^-1
	47	#define B7 3.62450978541155137218 // (cos(pi*7/16)sqrt(2))^-1
	48
	49
	50	#define A1 0.70710678118654752438 // cos(pi*4/16)
	51	#define A2 0.54119610014619698435 // cos(pi*6/16)sqrt(2)
	52	#define A5 0.38268343236508977170 // cos(pi*6/16)
	53	#define A4 1.30656296487637652774 // cos(pi*2/16)sqrt(2)
	54
	55	static const FLOAT postscale[64]={
	56	B0B0, B0B1, B0B2, B0B3, B0B4, B0B5, B0B6, B0B7,
	57	B1B0, B1B1, B1B2, B1B3, B1B4, B1B5, B1B6, B1B7,
	58	B2B0, B2B1, B2B2, B2B3, B2B4, B2B5, B2B6, B2B7,
	59	B3B0, B3B1, B3B2, B3B3, B3B4, B3B5, B3B6, B3B7,
	60	B4B0, B4B1, B4B2, B4B3, B4B4, B4B5, B4B6, B4B7,
	61	B5B0, B5B1, B5B2, B5B3, B5B4, B5B5, B5B6, B5B7,
	62	B6B0, B6B1, B6B2, B6B3, B6B4, B6B5, B6B6, B6B7,
	63	B7B0, B7B1, B7B2, B7B3, B7B4, B7B5, B7B6, B7B7,
	64	};
65
66	static av_always_inline void row_fdct(FLOAT temp[64], int16_t *data)
67	{
68	FLOAT tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
69	FLOAT tmp10, tmp11, tmp12, tmp13;
70	FLOAT z2, z4, z11, z13;
71	int i;
72
73	for (i=0; i<8*8; i+=8) {
74	tmp0= data[0 + i] + data[7 + i];
75	tmp7= data[0 + i] - data[7 + i];
76	tmp1= data[1 + i] + data[6 + i];
77	tmp6= data[1 + i] - data[6 + i];
78	tmp2= data[2 + i] + data[5 + i];
79	tmp5= data[2 + i] - data[5 + i];
80	tmp3= data[3 + i] + data[4 + i];
81	tmp4= data[3 + i] - data[4 + i];
82
83	tmp10= tmp0 + tmp3;
84	tmp13= tmp0 - tmp3;
85	tmp11= tmp1 + tmp2;
86	tmp12= tmp1 - tmp2;
87
88	temp[0 + i]= tmp10 + tmp11;
89	temp[4 + i]= tmp10 - tmp11;
90
91	tmp12 += tmp13;
92	tmp12 *= A1;
93	temp[2 + i]= tmp13 + tmp12;
94	temp[6 + i]= tmp13 - tmp12;
95
96	tmp4 += tmp5;
97	tmp5 += tmp6;
98	tmp6 += tmp7;
99
100	#if 0
101	{
102	FLOAT z5;
103	z5 = (tmp4 - tmp6) * A5;
104	z2 = tmp4 * A2 + z5;
105	z4 = tmp6 * A4 + z5;
106	}
107	#else
108	z2= tmp4(A2+A5) - tmp6A5;
109	z4= tmp6(A4-A5) + tmp4A5;
110	#endif
111	tmp5*=A1;
112
113	z11= tmp7 + tmp5;
114	z13= tmp7 - tmp5;
115
116	temp[5 + i]= z13 + z2;
117	temp[3 + i]= z13 - z2;
118	temp[1 + i]= z11 + z4;
119	temp[7 + i]= z11 - z4;
120	}
121	}
122
123	void ff_faandct(int16_t *data)
124	{
125	FLOAT tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
126	FLOAT tmp10, tmp11, tmp12, tmp13;
127	FLOAT z2, z4, z11, z13;
128	FLOAT temp[64];
129	int i;
130
131	emms_c();
132
133	row_fdct(temp, data);
134
135	for (i=0; i<8; i++) {
136	tmp0= temp[80 + i] + temp[87 + i];
137	tmp7= temp[80 + i] - temp[87 + i];
138	tmp1= temp[81 + i] + temp[86 + i];
139	tmp6= temp[81 + i] - temp[86 + i];
140	tmp2= temp[82 + i] + temp[85 + i];
141	tmp5= temp[82 + i] - temp[85 + i];
142	tmp3= temp[83 + i] + temp[84 + i];
143	tmp4= temp[83 + i] - temp[84 + i];
144
145	tmp10= tmp0 + tmp3;
146	tmp13= tmp0 - tmp3;
147	tmp11= tmp1 + tmp2;
148	tmp12= tmp1 - tmp2;
149
150	data[80 + i]= lrintf(postscale[80 + i] * (tmp10 + tmp11));
151	data[84 + i]= lrintf(postscale[84 + i] * (tmp10 - tmp11));
152
153	tmp12 += tmp13;
154	tmp12 *= A1;
155	data[82 + i]= lrintf(postscale[82 + i] * (tmp13 + tmp12));
156	data[86 + i]= lrintf(postscale[86 + i] * (tmp13 - tmp12));
157
158	tmp4 += tmp5;
159	tmp5 += tmp6;
160	tmp6 += tmp7;
161
162	#if 0
163	{
164	FLOAT z5;
165	z5 = (tmp4 - tmp6) * A5;
166	z2 = tmp4 * A2 + z5;
167	z4 = tmp6 * A4 + z5;
168	}
169	#else
170	z2= tmp4(A2+A5) - tmp6A5;
171	z4= tmp6(A4-A5) + tmp4A5;
172	#endif
173	tmp5*=A1;
174
175	z11= tmp7 + tmp5;
176	z13= tmp7 - tmp5;
177
178	data[85 + i]= lrintf(postscale[85 + i] * (z13 + z2));
179	data[83 + i]= lrintf(postscale[83 + i] * (z13 - z2));
180	data[81 + i]= lrintf(postscale[81 + i] * (z11 + z4));
181	data[87 + i]= lrintf(postscale[87 + i] * (z11 - z4));
182	}
183	}
184
185	void ff_faandct248(int16_t *data)
186	{
187	FLOAT tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
188	FLOAT tmp10, tmp11, tmp12, tmp13;
189	FLOAT temp[64];
190	int i;
191
192	emms_c();
193
194	row_fdct(temp, data);
195
196	for (i=0; i<8; i++) {
197	tmp0 = temp[80 + i] + temp[81 + i];
198	tmp1 = temp[82 + i] + temp[83 + i];
199	tmp2 = temp[84 + i] + temp[85 + i];
200	tmp3 = temp[86 + i] + temp[87 + i];
201	tmp4 = temp[80 + i] - temp[81 + i];
202	tmp5 = temp[82 + i] - temp[83 + i];
203	tmp6 = temp[84 + i] - temp[85 + i];
204	tmp7 = temp[86 + i] - temp[87 + i];
205
206	tmp10 = tmp0 + tmp3;
207	tmp11 = tmp1 + tmp2;
208	tmp12 = tmp1 - tmp2;
209	tmp13 = tmp0 - tmp3;
210
211	data[80 + i] = lrintf(postscale[80 + i] * (tmp10 + tmp11));
212	data[84 + i] = lrintf(postscale[84 + i] * (tmp10 - tmp11));
213
214	tmp12 += tmp13;
215	tmp12 *= A1;
216	data[82 + i] = lrintf(postscale[82 + i] * (tmp13 + tmp12));
217	data[86 + i] = lrintf(postscale[86 + i] * (tmp13 - tmp12));
218
219	tmp10 = tmp4 + tmp7;
220	tmp11 = tmp5 + tmp6;
221	tmp12 = tmp5 - tmp6;
222	tmp13 = tmp4 - tmp7;
223
224	data[81 + i] = lrintf(postscale[80 + i] * (tmp10 + tmp11));
225	data[85 + i] = lrintf(postscale[84 + i] * (tmp10 - tmp11));
226
227	tmp12 += tmp13;
228	tmp12 *= A1;
229	data[83 + i] = lrintf(postscale[82 + i] * (tmp13 + tmp12));
230	data[87 + i] = lrintf(postscale[86 + i] * (tmp13 - tmp12));
231	}
232	}