vp3dsp.c
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上传日期:2021-12-09
资源大小:5084k
文件大小:7k
源码类别:
Audio
开发平台:
Visual C++
- /*
- * Copyright (C) 2004 the ffmpeg project
- *
- * This library 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 of the License, or (at your option) any later version.
- *
- * This library 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- /**
- * @file vp3dsp.c
- * Standard C DSP-oriented functions cribbed from the original VP3
- * source code.
- */
- #include "common.h"
- #include "avcodec.h"
- #include "dsputil.h"
- #include "vp3data.h"
- #define IdctAdjustBeforeShift 8
- #define xC1S7 64277
- #define xC2S6 60547
- #define xC3S5 54491
- #define xC4S4 46341
- #define xC5S3 36410
- #define xC6S2 25080
- #define xC7S1 12785
- void vp3_dsp_init_c(void)
- {
- /* nop */
- }
- void vp3_idct_c(int16_t *input_data, int16_t *dequant_matrix,
- int coeff_count, int16_t *output_data)
- {
- int32_t dequantized_data[64];
- int32_t *ip = dequantized_data;
- int16_t *op = output_data;
- int32_t A_, B_, C_, D_, _Ad, _Bd, _Cd, _Dd, E_, F_, G_, H_;
- int32_t _Ed, _Gd, _Add, _Bdd, _Fd, _Hd;
- int32_t t1, t2;
- int i, j;
- /* de-zigzag and dequantize */
- for (i = 0; i < coeff_count; i++) {
- j = dezigzag_index[i];
- dequantized_data[j] = dequant_matrix[i] * input_data[i];
- }
- /* Inverse DCT on the rows now */
- for (i = 0; i < 8; i++) {
- /* Check for non-zero values */
- if ( ip[0] | ip[1] | ip[2] | ip[3] | ip[4] | ip[5] | ip[6] | ip[7] ) {
- t1 = (int32_t)(xC1S7 * ip[1]);
- t2 = (int32_t)(xC7S1 * ip[7]);
- t1 >>= 16;
- t2 >>= 16;
- A_ = t1 + t2;
- t1 = (int32_t)(xC7S1 * ip[1]);
- t2 = (int32_t)(xC1S7 * ip[7]);
- t1 >>= 16;
- t2 >>= 16;
- B_ = t1 - t2;
- t1 = (int32_t)(xC3S5 * ip[3]);
- t2 = (int32_t)(xC5S3 * ip[5]);
- t1 >>= 16;
- t2 >>= 16;
- C_ = t1 + t2;
- t1 = (int32_t)(xC3S5 * ip[5]);
- t2 = (int32_t)(xC5S3 * ip[3]);
- t1 >>= 16;
- t2 >>= 16;
- D_ = t1 - t2;
- t1 = (int32_t)(xC4S4 * (A_ - C_));
- t1 >>= 16;
- _Ad = t1;
- t1 = (int32_t)(xC4S4 * (B_ - D_));
- t1 >>= 16;
- _Bd = t1;
- _Cd = A_ + C_;
- _Dd = B_ + D_;
- t1 = (int32_t)(xC4S4 * (ip[0] + ip[4]));
- t1 >>= 16;
- E_ = t1;
- t1 = (int32_t)(xC4S4 * (ip[0] - ip[4]));
- t1 >>= 16;
- F_ = t1;
- t1 = (int32_t)(xC2S6 * ip[2]);
- t2 = (int32_t)(xC6S2 * ip[6]);
- t1 >>= 16;
- t2 >>= 16;
- G_ = t1 + t2;
- t1 = (int32_t)(xC6S2 * ip[2]);
- t2 = (int32_t)(xC2S6 * ip[6]);
- t1 >>= 16;
- t2 >>= 16;
- H_ = t1 - t2;
- _Ed = E_ - G_;
- _Gd = E_ + G_;
- _Add = F_ + _Ad;
- _Bdd = _Bd - H_;
- _Fd = F_ - _Ad;
- _Hd = _Bd + H_;
- /* Final sequence of operations over-write original inputs. */
- ip[0] = (int16_t)((_Gd + _Cd ) >> 0);
- ip[7] = (int16_t)((_Gd - _Cd ) >> 0);
- ip[1] = (int16_t)((_Add + _Hd ) >> 0);
- ip[2] = (int16_t)((_Add - _Hd ) >> 0);
- ip[3] = (int16_t)((_Ed + _Dd ) >> 0);
- ip[4] = (int16_t)((_Ed - _Dd ) >> 0);
- ip[5] = (int16_t)((_Fd + _Bdd ) >> 0);
- ip[6] = (int16_t)((_Fd - _Bdd ) >> 0);
- }
- ip += 8; /* next row */
- }
- ip = dequantized_data;
- for ( i = 0; i < 8; i++) {
- /* Check for non-zero values (bitwise or faster than ||) */
- if ( ip[0 * 8] | ip[1 * 8] | ip[2 * 8] | ip[3 * 8] |
- ip[4 * 8] | ip[5 * 8] | ip[6 * 8] | ip[7 * 8] ) {
- t1 = (int32_t)(xC1S7 * ip[1*8]);
- t2 = (int32_t)(xC7S1 * ip[7*8]);
- t1 >>= 16;
- t2 >>= 16;
- A_ = t1 + t2;
- t1 = (int32_t)(xC7S1 * ip[1*8]);
- t2 = (int32_t)(xC1S7 * ip[7*8]);
- t1 >>= 16;
- t2 >>= 16;
- B_ = t1 - t2;
- t1 = (int32_t)(xC3S5 * ip[3*8]);
- t2 = (int32_t)(xC5S3 * ip[5*8]);
- t1 >>= 16;
- t2 >>= 16;
- C_ = t1 + t2;
- t1 = (int32_t)(xC3S5 * ip[5*8]);
- t2 = (int32_t)(xC5S3 * ip[3*8]);
- t1 >>= 16;
- t2 >>= 16;
- D_ = t1 - t2;
- t1 = (int32_t)(xC4S4 * (A_ - C_));
- t1 >>= 16;
- _Ad = t1;
- t1 = (int32_t)(xC4S4 * (B_ - D_));
- t1 >>= 16;
- _Bd = t1;
- _Cd = A_ + C_;
- _Dd = B_ + D_;
- t1 = (int32_t)(xC4S4 * (ip[0*8] + ip[4*8]));
- t1 >>= 16;
- E_ = t1;
- t1 = (int32_t)(xC4S4 * (ip[0*8] - ip[4*8]));
- t1 >>= 16;
- F_ = t1;
- t1 = (int32_t)(xC2S6 * ip[2*8]);
- t2 = (int32_t)(xC6S2 * ip[6*8]);
- t1 >>= 16;
- t2 >>= 16;
- G_ = t1 + t2;
- t1 = (int32_t)(xC6S2 * ip[2*8]);
- t2 = (int32_t)(xC2S6 * ip[6*8]);
- t1 >>= 16;
- t2 >>= 16;
- H_ = t1 - t2;
- _Ed = E_ - G_;
- _Gd = E_ + G_;
- _Add = F_ + _Ad;
- _Bdd = _Bd - H_;
- _Fd = F_ - _Ad;
- _Hd = _Bd + H_;
- _Gd += IdctAdjustBeforeShift;
- _Add += IdctAdjustBeforeShift;
- _Ed += IdctAdjustBeforeShift;
- _Fd += IdctAdjustBeforeShift;
- /* Final sequence of operations over-write original inputs. */
- op[0*8] = (int16_t)((_Gd + _Cd ) >> 4);
- op[7*8] = (int16_t)((_Gd - _Cd ) >> 4);
- op[1*8] = (int16_t)((_Add + _Hd ) >> 4);
- op[2*8] = (int16_t)((_Add - _Hd ) >> 4);
- op[3*8] = (int16_t)((_Ed + _Dd ) >> 4);
- op[4*8] = (int16_t)((_Ed - _Dd ) >> 4);
- op[5*8] = (int16_t)((_Fd + _Bdd ) >> 4);
- op[6*8] = (int16_t)((_Fd - _Bdd ) >> 4);
- } else {
- op[0*8] = 0;
- op[7*8] = 0;
- op[1*8] = 0;
- op[2*8] = 0;
- op[3*8] = 0;
- op[4*8] = 0;
- op[5*8] = 0;
- op[6*8] = 0;
- }
- ip++; /* next column */
- op++;
- }
- }