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- /*
- * Copyright (c) 2001 Michel Lespinasse
- *
- * 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
- */
-
- /*
- * NOTE: This code is based on GPL code from the libmpeg2 project. The
- * author, Michel Lespinasses, has given explicit permission to release
- * under LGPL as part of ffmpeg.
- */
-
- /*
- * FFMpeg integration by Dieter Shirley
- *
- * This file is a direct copy of the altivec idct module from the libmpeg2
- * project. I've deleted all of the libmpeg2 specific code, renamed the functions and
- * re-ordered the function parameters. The only change to the IDCT function
- * itself was to factor out the partial transposition, and to perform a full
- * transpose at the end of the function.
- */
-
-
- #include <stdlib.h> /* malloc(), free() */
- #include <string.h>
- #include "libavcodec/dsputil.h"
-
- #include "gcc_fixes.h"
-
- #include "dsputil_ppc.h"
-
- #define vector_s16_t vector signed short
- #define const_vector_s16_t const vector signed short
- #define vector_u16_t vector unsigned short
- #define vector_s8_t vector signed char
- #define vector_u8_t vector unsigned char
- #define vector_s32_t vector signed int
- #define vector_u32_t vector unsigned int
-
- #define IDCT_HALF \
- /* 1st stage */ \
- t1 = vec_mradds (a1, vx7, vx1 ); \
- t8 = vec_mradds (a1, vx1, vec_subs (zero, vx7)); \
- t7 = vec_mradds (a2, vx5, vx3); \
- t3 = vec_mradds (ma2, vx3, vx5); \
- \
- /* 2nd stage */ \
- t5 = vec_adds (vx0, vx4); \
- t0 = vec_subs (vx0, vx4); \
- t2 = vec_mradds (a0, vx6, vx2); \
- t4 = vec_mradds (a0, vx2, vec_subs (zero, vx6)); \
- t6 = vec_adds (t8, t3); \
- t3 = vec_subs (t8, t3); \
- t8 = vec_subs (t1, t7); \
- t1 = vec_adds (t1, t7); \
- \
- /* 3rd stage */ \
- t7 = vec_adds (t5, t2); \
- t2 = vec_subs (t5, t2); \
- t5 = vec_adds (t0, t4); \
- t0 = vec_subs (t0, t4); \
- t4 = vec_subs (t8, t3); \
- t3 = vec_adds (t8, t3); \
- \
- /* 4th stage */ \
- vy0 = vec_adds (t7, t1); \
- vy7 = vec_subs (t7, t1); \
- vy1 = vec_mradds (c4, t3, t5); \
- vy6 = vec_mradds (mc4, t3, t5); \
- vy2 = vec_mradds (c4, t4, t0); \
- vy5 = vec_mradds (mc4, t4, t0); \
- vy3 = vec_adds (t2, t6); \
- vy4 = vec_subs (t2, t6);
-
-
- #define IDCT \
- vector_s16_t vx0, vx1, vx2, vx3, vx4, vx5, vx6, vx7; \
- vector_s16_t vy0, vy1, vy2, vy3, vy4, vy5, vy6, vy7; \
- vector_s16_t a0, a1, a2, ma2, c4, mc4, zero, bias; \
- vector_s16_t t0, t1, t2, t3, t4, t5, t6, t7, t8; \
- vector_u16_t shift; \
- \
- c4 = vec_splat (constants[0], 0); \
- a0 = vec_splat (constants[0], 1); \
- a1 = vec_splat (constants[0], 2); \
- a2 = vec_splat (constants[0], 3); \
- mc4 = vec_splat (constants[0], 4); \
- ma2 = vec_splat (constants[0], 5); \
- bias = (vector_s16_t)vec_splat ((vector_s32_t)constants[0], 3); \
- \
- zero = vec_splat_s16 (0); \
- shift = vec_splat_u16 (4); \
- \
- vx0 = vec_mradds (vec_sl (block[0], shift), constants[1], zero); \
- vx1 = vec_mradds (vec_sl (block[1], shift), constants[2], zero); \
- vx2 = vec_mradds (vec_sl (block[2], shift), constants[3], zero); \
- vx3 = vec_mradds (vec_sl (block[3], shift), constants[4], zero); \
- vx4 = vec_mradds (vec_sl (block[4], shift), constants[1], zero); \
- vx5 = vec_mradds (vec_sl (block[5], shift), constants[4], zero); \
- vx6 = vec_mradds (vec_sl (block[6], shift), constants[3], zero); \
- vx7 = vec_mradds (vec_sl (block[7], shift), constants[2], zero); \
- \
- IDCT_HALF \
- \
- vx0 = vec_mergeh (vy0, vy4); \
- vx1 = vec_mergel (vy0, vy4); \
- vx2 = vec_mergeh (vy1, vy5); \
- vx3 = vec_mergel (vy1, vy5); \
- vx4 = vec_mergeh (vy2, vy6); \
- vx5 = vec_mergel (vy2, vy6); \
- vx6 = vec_mergeh (vy3, vy7); \
- vx7 = vec_mergel (vy3, vy7); \
- \
- vy0 = vec_mergeh (vx0, vx4); \
- vy1 = vec_mergel (vx0, vx4); \
- vy2 = vec_mergeh (vx1, vx5); \
- vy3 = vec_mergel (vx1, vx5); \
- vy4 = vec_mergeh (vx2, vx6); \
- vy5 = vec_mergel (vx2, vx6); \
- vy6 = vec_mergeh (vx3, vx7); \
- vy7 = vec_mergel (vx3, vx7); \
- \
- vx0 = vec_adds (vec_mergeh (vy0, vy4), bias); \
- vx1 = vec_mergel (vy0, vy4); \
- vx2 = vec_mergeh (vy1, vy5); \
- vx3 = vec_mergel (vy1, vy5); \
- vx4 = vec_mergeh (vy2, vy6); \
- vx5 = vec_mergel (vy2, vy6); \
- vx6 = vec_mergeh (vy3, vy7); \
- vx7 = vec_mergel (vy3, vy7); \
- \
- IDCT_HALF \
- \
- shift = vec_splat_u16 (6); \
- vx0 = vec_sra (vy0, shift); \
- vx1 = vec_sra (vy1, shift); \
- vx2 = vec_sra (vy2, shift); \
- vx3 = vec_sra (vy3, shift); \
- vx4 = vec_sra (vy4, shift); \
- vx5 = vec_sra (vy5, shift); \
- vx6 = vec_sra (vy6, shift); \
- vx7 = vec_sra (vy7, shift);
-
-
- static const_vector_s16_t constants[5] = {
- {23170, 13573, 6518, 21895, -23170, -21895, 32, 31},
- {16384, 22725, 21407, 19266, 16384, 19266, 21407, 22725},
- {22725, 31521, 29692, 26722, 22725, 26722, 29692, 31521},
- {21407, 29692, 27969, 25172, 21407, 25172, 27969, 29692},
- {19266, 26722, 25172, 22654, 19266, 22654, 25172, 26722}
- };
-
- void idct_put_altivec(uint8_t* dest, int stride, vector_s16_t* block)
- {
- POWERPC_PERF_DECLARE(altivec_idct_put_num, 1);
- vector_u8_t tmp;
-
- #ifdef CONFIG_POWERPC_PERF
- POWERPC_PERF_START_COUNT(altivec_idct_put_num, 1);
- #endif
- IDCT
-
- #define COPY(dest,src) \
- tmp = vec_packsu (src, src); \
- vec_ste ((vector_u32_t)tmp, 0, (unsigned int *)dest); \
- vec_ste ((vector_u32_t)tmp, 4, (unsigned int *)dest);
-
- COPY (dest, vx0) dest += stride;
- COPY (dest, vx1) dest += stride;
- COPY (dest, vx2) dest += stride;
- COPY (dest, vx3) dest += stride;
- COPY (dest, vx4) dest += stride;
- COPY (dest, vx5) dest += stride;
- COPY (dest, vx6) dest += stride;
- COPY (dest, vx7)
-
- POWERPC_PERF_STOP_COUNT(altivec_idct_put_num, 1);
- }
-
- void idct_add_altivec(uint8_t* dest, int stride, vector_s16_t* block)
- {
- POWERPC_PERF_DECLARE(altivec_idct_add_num, 1);
- vector_u8_t tmp;
- vector_s16_t tmp2, tmp3;
- vector_u8_t perm0;
- vector_u8_t perm1;
- vector_u8_t p0, p1, p;
-
- #ifdef CONFIG_POWERPC_PERF
- POWERPC_PERF_START_COUNT(altivec_idct_add_num, 1);
- #endif
-
- IDCT
-
- p0 = vec_lvsl (0, dest);
- p1 = vec_lvsl (stride, dest);
- p = vec_splat_u8 (-1);
- perm0 = vec_mergeh (p, p0);
- perm1 = vec_mergeh (p, p1);
-
- #define ADD(dest,src,perm) \
- /* *(uint64_t *)&tmp = *(uint64_t *)dest; */ \
- tmp = vec_ld (0, dest); \
- tmp2 = (vector_s16_t)vec_perm (tmp, (vector_u8_t)zero, perm); \
- tmp3 = vec_adds (tmp2, src); \
- tmp = vec_packsu (tmp3, tmp3); \
- vec_ste ((vector_u32_t)tmp, 0, (unsigned int *)dest); \
- vec_ste ((vector_u32_t)tmp, 4, (unsigned int *)dest);
-
- ADD (dest, vx0, perm0) dest += stride;
- ADD (dest, vx1, perm1) dest += stride;
- ADD (dest, vx2, perm0) dest += stride;
- ADD (dest, vx3, perm1) dest += stride;
- ADD (dest, vx4, perm0) dest += stride;
- ADD (dest, vx5, perm1) dest += stride;
- ADD (dest, vx6, perm0) dest += stride;
- ADD (dest, vx7, perm1)
-
- POWERPC_PERF_STOP_COUNT(altivec_idct_add_num, 1);
- }
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