/src/ffmpeg/libavcodec/idctdsp.c

Source
/*
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "config.h"
#include "config_components.h"
#include "libavutil/attributes.h"
#include "libavutil/common.h"
#include "avcodec.h"
#include "dct.h"
#include "faanidct.h"
#include "idctdsp.h"
#include "simple_idct.h"
#include "xvididct.h"

av_cold void ff_permute_scantable(uint8_t dst[64], const uint8_t src[64],
                                  const uint8_t permutation[64])
{
    for (int i = 0; i < 64; i++) {
        int j = src[i];
        dst[i] = permutation[j];
    }
}

av_cold void ff_init_scantable_permutation(uint8_t *idct_permutation,
                                           enum idct_permutation_type perm_type)
{
    int i;

#if ARCH_X86 && HAVE_X86ASM
    if (ff_init_scantable_permutation_x86(idct_permutation,
                                          perm_type))
        return;
#endif

    switch (perm_type) {
    case FF_IDCT_PERM_NONE:
        for (i = 0; i < 64; i++)
            idct_permutation[i] = i;
        break;
    case FF_IDCT_PERM_LIBMPEG2:
        for (i = 0; i < 64; i++)
            idct_permutation[i] = (i & 0x38) | ((i & 6) >> 1) | ((i & 1) << 2);
        break;
    case FF_IDCT_PERM_TRANSPOSE:
        for (i = 0; i < 64; i++)
            idct_permutation[i] = ((i & 7) << 3) | (i >> 3);
        break;
    case FF_IDCT_PERM_PARTTRANS:
        for (i = 0; i < 64; i++)
            idct_permutation[i] = (i & 0x24) | ((i & 3) << 3) | ((i >> 3) & 3);
        break;
    default:
        av_log(NULL, AV_LOG_ERROR,
               "Internal error, IDCT permutation not set\n");
    }
}

void ff_put_pixels_clamped_c(const int16_t *block, uint8_t *restrict pixels,
                             ptrdiff_t line_size)
{
    int i;

    /* read the pixels */
    for (i = 0; i < 8; i++) {
        pixels[0] = av_clip_uint8(block[0]);
        pixels[1] = av_clip_uint8(block[1]);
        pixels[2] = av_clip_uint8(block[2]);
        pixels[3] = av_clip_uint8(block[3]);
        pixels[4] = av_clip_uint8(block[4]);
        pixels[5] = av_clip_uint8(block[5]);
        pixels[6] = av_clip_uint8(block[6]);
        pixels[7] = av_clip_uint8(block[7]);

        pixels += line_size;
        block  += 8;
    }
}

static void put_pixels_clamped4_c(const int16_t *block, uint8_t *restrict pixels,
                                 int line_size)
{
    int i;

    /* read the pixels */
    for(i=0;i<4;i++) {
        pixels[0] = av_clip_uint8(block[0]);
        pixels[1] = av_clip_uint8(block[1]);
        pixels[2] = av_clip_uint8(block[2]);
        pixels[3] = av_clip_uint8(block[3]);

        pixels += line_size;
        block += 8;
    }
}

static void put_pixels_clamped2_c(const int16_t *block, uint8_t *restrict pixels,
                                 int line_size)
{
    int i;

    /* read the pixels */
    for(i=0;i<2;i++) {
        pixels[0] = av_clip_uint8(block[0]);
        pixels[1] = av_clip_uint8(block[1]);

        pixels += line_size;
        block += 8;
    }
}

static void put_signed_pixels_clamped_c(const int16_t *block,
                                        uint8_t *restrict pixels,
                                        ptrdiff_t line_size)
{
    int i, j;

    for (i = 0; i < 8; i++) {
        for (j = 0; j < 8; j++) {
            if (*block < -128)
                *pixels = 0;
            else if (*block > 127)
                *pixels = 255;
            else
                *pixels = (uint8_t) (*block + 128);
            block++;
            pixels++;
        }
        pixels += (line_size - 8);
    }
}

void ff_add_pixels_clamped_c(const int16_t *block, uint8_t *restrict pixels,
                             ptrdiff_t line_size)
{
    int i;

    /* read the pixels */
    for (i = 0; i < 8; i++) {
        pixels[0] = av_clip_uint8(pixels[0] + block[0]);
        pixels[1] = av_clip_uint8(pixels[1] + block[1]);
        pixels[2] = av_clip_uint8(pixels[2] + block[2]);
        pixels[3] = av_clip_uint8(pixels[3] + block[3]);
        pixels[4] = av_clip_uint8(pixels[4] + block[4]);
        pixels[5] = av_clip_uint8(pixels[5] + block[5]);
        pixels[6] = av_clip_uint8(pixels[6] + block[6]);
        pixels[7] = av_clip_uint8(pixels[7] + block[7]);
        pixels   += line_size;
        block    += 8;
    }
}

static void add_pixels_clamped4_c(const int16_t *block, uint8_t *restrict pixels,
                          int line_size)
{
    int i;

    /* read the pixels */
    for(i=0;i<4;i++) {
        pixels[0] = av_clip_uint8(pixels[0] + block[0]);
        pixels[1] = av_clip_uint8(pixels[1] + block[1]);
        pixels[2] = av_clip_uint8(pixels[2] + block[2]);
        pixels[3] = av_clip_uint8(pixels[3] + block[3]);
        pixels += line_size;
        block += 8;
    }
}

static void add_pixels_clamped2_c(const int16_t *block, uint8_t *restrict pixels,
                          int line_size)
{
    int i;

    /* read the pixels */
    for(i=0;i<2;i++) {
        pixels[0] = av_clip_uint8(pixels[0] + block[0]);
        pixels[1] = av_clip_uint8(pixels[1] + block[1]);
        pixels += line_size;
        block += 8;
    }
}

static void ff_jref_idct4_put(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
{
    ff_j_rev_dct4 (block);
    put_pixels_clamped4_c(block, dest, line_size);
}
static void ff_jref_idct4_add(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
{
    ff_j_rev_dct4 (block);
    add_pixels_clamped4_c(block, dest, line_size);
}

static void ff_jref_idct2_put(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
{
    ff_j_rev_dct2 (block);
    put_pixels_clamped2_c(block, dest, line_size);
}
static void ff_jref_idct2_add(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
{
    ff_j_rev_dct2 (block);
    add_pixels_clamped2_c(block, dest, line_size);
}

static void ff_jref_idct1_put(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
{
    dest[0] = av_clip_uint8((block[0] + 4)>>3);
}
static void ff_jref_idct1_add(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
{
    dest[0] = av_clip_uint8(dest[0] + ((block[0] + 4)>>3));
}

av_cold void ff_idctdsp_init(IDCTDSPContext *c, AVCodecContext *avctx)
{
    av_unused const unsigned high_bit_depth = avctx->bits_per_raw_sample > 8;

    if (avctx->lowres==1) {
        c->idct_put  = ff_jref_idct4_put;
        c->idct_add  = ff_jref_idct4_add;
        c->idct      = ff_j_rev_dct4;
        c->perm_type = FF_IDCT_PERM_NONE;
    } else if (avctx->lowres==2) {
        c->idct_put  = ff_jref_idct2_put;
        c->idct_add  = ff_jref_idct2_add;
        c->idct      = ff_j_rev_dct2;
        c->perm_type = FF_IDCT_PERM_NONE;
    } else if (avctx->lowres==3) {
        c->idct_put  = ff_jref_idct1_put;
        c->idct_add  = ff_jref_idct1_add;
        c->idct      = ff_j_rev_dct1;
        c->perm_type = FF_IDCT_PERM_NONE;
    } else {
        if (avctx->bits_per_raw_sample == 10 || avctx->bits_per_raw_sample == 9) {
            /* 10-bit MPEG-4 Simple Studio Profile requires a higher precision IDCT
               However, it only uses idct_put */
            if (c->mpeg4_studio_profile) {
                c->idct_put              = ff_simple_idct_put_int32_10bit;
                c->idct_add              = NULL;
                c->idct                  = NULL;
            } else {
                c->idct_put              = ff_simple_idct_put_int16_10bit;
                c->idct_add              = ff_simple_idct_add_int16_10bit;
                c->idct                  = ff_simple_idct_int16_10bit;
            }
            c->perm_type             = FF_IDCT_PERM_NONE;
        } else if (avctx->bits_per_raw_sample == 12) {
            c->idct_put              = ff_simple_idct_put_int16_12bit;
            c->idct_add              = ff_simple_idct_add_int16_12bit;
            c->idct                  = ff_simple_idct_int16_12bit;
            c->perm_type             = FF_IDCT_PERM_NONE;
        } else {
            if (avctx->idct_algo == FF_IDCT_INT) {
                c->idct_put  = ff_jref_idct_put;
                c->idct_add  = ff_jref_idct_add;
                c->idct      = ff_j_rev_dct;
                c->perm_type = FF_IDCT_PERM_LIBMPEG2;
#if CONFIG_FAANIDCT
            } else if (avctx->idct_algo == FF_IDCT_FAAN) {
                c->idct_put  = ff_faanidct_put;
                c->idct_add  = ff_faanidct_add;
                c->idct      = ff_faanidct;
                c->perm_type = FF_IDCT_PERM_NONE;
#endif /* CONFIG_FAANIDCT */
#if CONFIG_MPEG4_DECODER
            } else if (avctx->idct_algo == FF_IDCT_XVID) {
                ff_xvid_idct_init(c);
#endif
            } else { // accurate/default
                c->idct_put  = ff_simple_idct_put_int16_8bit;
                c->idct_add  = ff_simple_idct_add_int16_8bit;
                c->idct      = ff_simple_idct_int16_8bit;
                c->perm_type = FF_IDCT_PERM_NONE;
            }
        }
    }

    c->put_pixels_clamped        = ff_put_pixels_clamped_c;
    c->put_signed_pixels_clamped = put_signed_pixels_clamped_c;
    c->add_pixels_clamped        = ff_add_pixels_clamped_c;

#if ARCH_AARCH64
    ff_idctdsp_init_aarch64(c, avctx, high_bit_depth);
#elif ARCH_ARM
    ff_idctdsp_init_arm(c, avctx, high_bit_depth);
#elif ARCH_PPC
    ff_idctdsp_init_ppc(c, avctx, high_bit_depth);
#elif ARCH_RISCV
    ff_idctdsp_init_riscv(c, avctx, high_bit_depth);
#elif ARCH_X86 && HAVE_X86ASM
    ff_idctdsp_init_x86(c, avctx, high_bit_depth);
#elif ARCH_MIPS
    ff_idctdsp_init_mips(c, avctx, high_bit_depth);
#elif ARCH_LOONGARCH
    ff_idctdsp_init_loongarch(c, avctx, high_bit_depth);
#endif

    ff_init_scantable_permutation(c->idct_permutation,
                                  c->perm_type);
}

Coverage Report

Created: 2026-07-25 07:52

Line	Count	Source
1		/*
2		* This file is part of FFmpeg.
3		*
4		* FFmpeg is free software; you can redistribute it and/or
5		* modify it under the terms of the GNU Lesser General Public
6		* License as published by the Free Software Foundation; either
7		* version 2.1 of the License, or (at your option) any later version.
8		*
9		* FFmpeg is distributed in the hope that it will be useful,
10		* but WITHOUT ANY WARRANTY; without even the implied warranty of
11		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12		* Lesser General Public License for more details.
13		*
14		* You should have received a copy of the GNU Lesser General Public
15		* License along with FFmpeg; if not, write to the Free Software
16		* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17		*/
18
19		#include "config.h"
20		#include "config_components.h"
21		#include "libavutil/attributes.h"
22		#include "libavutil/common.h"
23		#include "avcodec.h"
24		#include "dct.h"
25		#include "faanidct.h"
26		#include "idctdsp.h"
27		#include "simple_idct.h"
28		#include "xvididct.h"
29
30		av_cold void ff_permute_scantable(uint8_t dst[64], const uint8_t src[64],
31		const uint8_t permutation[64])
32	1.70M	{
33	111M	for (int i = 0; i < 64; i++) {
34	109M	int j = src[i];
35	109M	dst[i] = permutation[j];
36	109M	}
37	1.70M	}
38
39		av_cold void ff_init_scantable_permutation(uint8_t *idct_permutation,
40		enum idct_permutation_type perm_type)
41	833k	{
42	833k	int i;
43
44		#if ARCH_X86 && HAVE_X86ASM
45		if (ff_init_scantable_permutation_x86(idct_permutation,
46		perm_type))
47		return;
48		#endif
49
50	833k	switch (perm_type) {
51	752k	case FF_IDCT_PERM_NONE:
52	48.9M	for (i = 0; i < 64; i++)
53	48.1M	idct_permutation[i] = i;
54	752k	break;
55	80.4k	case FF_IDCT_PERM_LIBMPEG2:
56	5.22M	for (i = 0; i < 64; i++)
57	5.14M	idct_permutation[i] = (i & 0x38) \| ((i & 6) >> 1) \| ((i & 1) << 2);
58	80.4k	break;
59	0	case FF_IDCT_PERM_TRANSPOSE:
60	0	for (i = 0; i < 64; i++)
61	0	idct_permutation[i] = ((i & 7) << 3) \| (i >> 3);
62	0	break;
63	0	case FF_IDCT_PERM_PARTTRANS:
64	0	for (i = 0; i < 64; i++)
65	0	idct_permutation[i] = (i & 0x24) \| ((i & 3) << 3) \| ((i >> 3) & 3);
66	0	break;
67	0	default:
68	0	av_log(NULL, AV_LOG_ERROR,
69	0	"Internal error, IDCT permutation not set\n");
70	833k	}
71	833k	}
72
73		void ff_put_pixels_clamped_c(const int16_t block, uint8_t restrict pixels,
74		ptrdiff_t line_size)
75	100M	{
76	100M	int i;
77
78		/* read the pixels */
79	907M	for (i = 0; i < 8; i++) {
80	806M	pixels[0] = av_clip_uint8(block[0]);
81	806M	pixels[1] = av_clip_uint8(block[1]);
82	806M	pixels[2] = av_clip_uint8(block[2]);
83	806M	pixels[3] = av_clip_uint8(block[3]);
84	806M	pixels[4] = av_clip_uint8(block[4]);
85	806M	pixels[5] = av_clip_uint8(block[5]);
86	806M	pixels[6] = av_clip_uint8(block[6]);
87	806M	pixels[7] = av_clip_uint8(block[7]);
88
89	806M	pixels += line_size;
90	806M	block += 8;
91	806M	}
92	100M	}
93
94		static void put_pixels_clamped4_c(const int16_t block, uint8_t restrict pixels,
95		int line_size)
96	12.6M	{
97	12.6M	int i;
98
99		/* read the pixels */
100	63.1M	for(i=0;i<4;i++) {
101	50.4M	pixels[0] = av_clip_uint8(block[0]);
102	50.4M	pixels[1] = av_clip_uint8(block[1]);
103	50.4M	pixels[2] = av_clip_uint8(block[2]);
104	50.4M	pixels[3] = av_clip_uint8(block[3]);
105
106	50.4M	pixels += line_size;
107	50.4M	block += 8;
108	50.4M	}
109	12.6M	}
110
111		static void put_pixels_clamped2_c(const int16_t block, uint8_t restrict pixels,
112		int line_size)
113	5.78M	{
114	5.78M	int i;
115
116		/* read the pixels */
117	17.3M	for(i=0;i<2;i++) {
118	11.5M	pixels[0] = av_clip_uint8(block[0]);
119	11.5M	pixels[1] = av_clip_uint8(block[1]);
120
121	11.5M	pixels += line_size;
122	11.5M	block += 8;
123	11.5M	}
124	5.78M	}
125
126		static void put_signed_pixels_clamped_c(const int16_t *block,
127		uint8_t *restrict pixels,
128		ptrdiff_t line_size)
129	25.8M	{
130	25.8M	int i, j;
131
132	232M	for (i = 0; i < 8; i++) {
133	1.86G	for (j = 0; j < 8; j++) {
134	1.65G	if (*block < -128)
135	364M	*pixels = 0;
136	1.29G	else if (*block > 127)
137	515M	*pixels = 255;
138	775M	else
139	775M	pixels = (uint8_t) (block + 128);
140	1.65G	block++;
141	1.65G	pixels++;
142	1.65G	}
143	207M	pixels += (line_size - 8);
144	207M	}
145	25.8M	}
146
147		void ff_add_pixels_clamped_c(const int16_t block, uint8_t restrict pixels,
148		ptrdiff_t line_size)
149	17.5M	{
150	17.5M	int i;
151
152		/* read the pixels */
153	157M	for (i = 0; i < 8; i++) {
154	140M	pixels[0] = av_clip_uint8(pixels[0] + block[0]);
155	140M	pixels[1] = av_clip_uint8(pixels[1] + block[1]);
156	140M	pixels[2] = av_clip_uint8(pixels[2] + block[2]);
157	140M	pixels[3] = av_clip_uint8(pixels[3] + block[3]);
158	140M	pixels[4] = av_clip_uint8(pixels[4] + block[4]);
159	140M	pixels[5] = av_clip_uint8(pixels[5] + block[5]);
160	140M	pixels[6] = av_clip_uint8(pixels[6] + block[6]);
161	140M	pixels[7] = av_clip_uint8(pixels[7] + block[7]);
162	140M	pixels += line_size;
163	140M	block += 8;
164	140M	}
165	17.5M	}
166
167		static void add_pixels_clamped4_c(const int16_t block, uint8_t restrict pixels,
168		int line_size)
169	3.15M	{
170	3.15M	int i;
171
172		/* read the pixels */
173	15.7M	for(i=0;i<4;i++) {
174	12.6M	pixels[0] = av_clip_uint8(pixels[0] + block[0]);
175	12.6M	pixels[1] = av_clip_uint8(pixels[1] + block[1]);
176	12.6M	pixels[2] = av_clip_uint8(pixels[2] + block[2]);
177	12.6M	pixels[3] = av_clip_uint8(pixels[3] + block[3]);
178	12.6M	pixels += line_size;
179	12.6M	block += 8;
180	12.6M	}
181	3.15M	}
182
183		static void add_pixels_clamped2_c(const int16_t block, uint8_t restrict pixels,
184		int line_size)
185	954k	{
186	954k	int i;
187
188		/* read the pixels */
189	2.86M	for(i=0;i<2;i++) {
190	1.90M	pixels[0] = av_clip_uint8(pixels[0] + block[0]);
191	1.90M	pixels[1] = av_clip_uint8(pixels[1] + block[1]);
192	1.90M	pixels += line_size;
193	1.90M	block += 8;
194	1.90M	}
195	954k	}
196
197		static void ff_jref_idct4_put(uint8_t dest, ptrdiff_t line_size, int16_t block)
198	12.6M	{
199	12.6M	ff_j_rev_dct4 (block);
200	12.6M	put_pixels_clamped4_c(block, dest, line_size);
201	12.6M	}
202		static void ff_jref_idct4_add(uint8_t dest, ptrdiff_t line_size, int16_t block)
203	3.15M	{
204	3.15M	ff_j_rev_dct4 (block);
205	3.15M	add_pixels_clamped4_c(block, dest, line_size);
206	3.15M	}
207
208		static void ff_jref_idct2_put(uint8_t dest, ptrdiff_t line_size, int16_t block)
209	5.78M	{
210	5.78M	ff_j_rev_dct2 (block);
211	5.78M	put_pixels_clamped2_c(block, dest, line_size);
212	5.78M	}
213		static void ff_jref_idct2_add(uint8_t dest, ptrdiff_t line_size, int16_t block)
214	954k	{
215	954k	ff_j_rev_dct2 (block);
216	954k	add_pixels_clamped2_c(block, dest, line_size);
217	954k	}
218
219		static void ff_jref_idct1_put(uint8_t dest, ptrdiff_t line_size, int16_t block)
220	6.90M	{
221	6.90M	dest[0] = av_clip_uint8((block[0] + 4)>>3);
222	6.90M	}
223		static void ff_jref_idct1_add(uint8_t dest, ptrdiff_t line_size, int16_t block)
224	2.49M	{
225	2.49M	dest[0] = av_clip_uint8(dest[0] + ((block[0] + 4)>>3));
226	2.49M	}
227
228		av_cold void ff_idctdsp_init(IDCTDSPContext c, AVCodecContext avctx)
229	756k	{
230	756k	av_unused const unsigned high_bit_depth = avctx->bits_per_raw_sample > 8;
231
232	756k	if (avctx->lowres==1) {
233	38.5k	c->idct_put = ff_jref_idct4_put;
234	38.5k	c->idct_add = ff_jref_idct4_add;
235	38.5k	c->idct = ff_j_rev_dct4;
236	38.5k	c->perm_type = FF_IDCT_PERM_NONE;
237	718k	} else if (avctx->lowres==2) {
238	14.6k	c->idct_put = ff_jref_idct2_put;
239	14.6k	c->idct_add = ff_jref_idct2_add;
240	14.6k	c->idct = ff_j_rev_dct2;
241	14.6k	c->perm_type = FF_IDCT_PERM_NONE;
242	703k	} else if (avctx->lowres==3) {
243	17.3k	c->idct_put = ff_jref_idct1_put;
244	17.3k	c->idct_add = ff_jref_idct1_add;
245	17.3k	c->idct = ff_j_rev_dct1;
246	17.3k	c->perm_type = FF_IDCT_PERM_NONE;
247	686k	} else {
248	686k	if (avctx->bits_per_raw_sample == 10 \|\| avctx->bits_per_raw_sample == 9) {
249		/* 10-bit MPEG-4 Simple Studio Profile requires a higher precision IDCT
250		However, it only uses idct_put */
251	86.5k	if (c->mpeg4_studio_profile) {
252	1.00k	c->idct_put = ff_simple_idct_put_int32_10bit;
253	1.00k	c->idct_add = NULL;
254	1.00k	c->idct = NULL;
255	85.5k	} else {
256	85.5k	c->idct_put = ff_simple_idct_put_int16_10bit;
257	85.5k	c->idct_add = ff_simple_idct_add_int16_10bit;
258	85.5k	c->idct = ff_simple_idct_int16_10bit;
259	85.5k	}
260	86.5k	c->perm_type = FF_IDCT_PERM_NONE;
261	599k	} else if (avctx->bits_per_raw_sample == 12) {
262	29.1k	c->idct_put = ff_simple_idct_put_int16_12bit;
263	29.1k	c->idct_add = ff_simple_idct_add_int16_12bit;
264	29.1k	c->idct = ff_simple_idct_int16_12bit;
265	29.1k	c->perm_type = FF_IDCT_PERM_NONE;
266	570k	} else {
267	570k	if (avctx->idct_algo == FF_IDCT_INT) {
268	80.4k	c->idct_put = ff_jref_idct_put;
269	80.4k	c->idct_add = ff_jref_idct_add;
270	80.4k	c->idct = ff_j_rev_dct;
271	80.4k	c->perm_type = FF_IDCT_PERM_LIBMPEG2;
272	80.4k	#if CONFIG_FAANIDCT
273	489k	} else if (avctx->idct_algo == FF_IDCT_FAAN) {
274	22.0k	c->idct_put = ff_faanidct_put;
275	22.0k	c->idct_add = ff_faanidct_add;
276	22.0k	c->idct = ff_faanidct;
277	22.0k	c->perm_type = FF_IDCT_PERM_NONE;
278	22.0k	#endif /* CONFIG_FAANIDCT */
279	22.0k	#if CONFIG_MPEG4_DECODER
280	467k	} else if (avctx->idct_algo == FF_IDCT_XVID) {
281	67.1k	ff_xvid_idct_init(c);
282	67.1k	#endif
283	400k	} else { // accurate/default
284	400k	c->idct_put = ff_simple_idct_put_int16_8bit;
285	400k	c->idct_add = ff_simple_idct_add_int16_8bit;
286	400k	c->idct = ff_simple_idct_int16_8bit;
287	400k	c->perm_type = FF_IDCT_PERM_NONE;
288	400k	}
289	570k	}
290	686k	}
291
292	756k	c->put_pixels_clamped = ff_put_pixels_clamped_c;
293	756k	c->put_signed_pixels_clamped = put_signed_pixels_clamped_c;
294	756k	c->add_pixels_clamped = ff_add_pixels_clamped_c;
295
296		#if ARCH_AARCH64
297		ff_idctdsp_init_aarch64(c, avctx, high_bit_depth);
298		#elif ARCH_ARM
299		ff_idctdsp_init_arm(c, avctx, high_bit_depth);
300		#elif ARCH_PPC
301		ff_idctdsp_init_ppc(c, avctx, high_bit_depth);
302		#elif ARCH_RISCV
303		ff_idctdsp_init_riscv(c, avctx, high_bit_depth);
304		#elif ARCH_X86 && HAVE_X86ASM
305		ff_idctdsp_init_x86(c, avctx, high_bit_depth);
306		#elif ARCH_MIPS
307		ff_idctdsp_init_mips(c, avctx, high_bit_depth);
308		#elif ARCH_LOONGARCH
309		ff_idctdsp_init_loongarch(c, avctx, high_bit_depth);
310		#endif
311
312	756k	ff_init_scantable_permutation(c->idct_permutation,
313	756k	c->perm_type);
314	756k	}