diff options
Diffstat (limited to 'media/libvpx/vp8/common/loopfilter_filters.c')
-rw-r--r-- | media/libvpx/vp8/common/loopfilter_filters.c | 430 |
1 files changed, 430 insertions, 0 deletions
diff --git a/media/libvpx/vp8/common/loopfilter_filters.c b/media/libvpx/vp8/common/loopfilter_filters.c new file mode 100644 index 000000000..1d51696ff --- /dev/null +++ b/media/libvpx/vp8/common/loopfilter_filters.c @@ -0,0 +1,430 @@ +/* + * Copyright (c) 2010 The WebM project authors. All Rights Reserved. + * + * Use of this source code is governed by a BSD-style license + * that can be found in the LICENSE file in the root of the source + * tree. An additional intellectual property rights grant can be found + * in the file PATENTS. All contributing project authors may + * be found in the AUTHORS file in the root of the source tree. + */ + + +#include <stdlib.h> +#include "loopfilter.h" +#include "onyxc_int.h" + +typedef unsigned char uc; + +static signed char vp8_signed_char_clamp(int t) +{ + t = (t < -128 ? -128 : t); + t = (t > 127 ? 127 : t); + return (signed char) t; +} + + +/* should we apply any filter at all ( 11111111 yes, 00000000 no) */ +static signed char vp8_filter_mask(uc limit, uc blimit, + uc p3, uc p2, uc p1, uc p0, + uc q0, uc q1, uc q2, uc q3) +{ + signed char mask = 0; + mask |= (abs(p3 - p2) > limit); + mask |= (abs(p2 - p1) > limit); + mask |= (abs(p1 - p0) > limit); + mask |= (abs(q1 - q0) > limit); + mask |= (abs(q2 - q1) > limit); + mask |= (abs(q3 - q2) > limit); + mask |= (abs(p0 - q0) * 2 + abs(p1 - q1) / 2 > blimit); + return mask - 1; +} + +/* is there high variance internal edge ( 11111111 yes, 00000000 no) */ +static signed char vp8_hevmask(uc thresh, uc p1, uc p0, uc q0, uc q1) +{ + signed char hev = 0; + hev |= (abs(p1 - p0) > thresh) * -1; + hev |= (abs(q1 - q0) > thresh) * -1; + return hev; +} + +static void vp8_filter(signed char mask, uc hev, uc *op1, + uc *op0, uc *oq0, uc *oq1) + +{ + signed char ps0, qs0; + signed char ps1, qs1; + signed char filter_value, Filter1, Filter2; + signed char u; + + ps1 = (signed char) * op1 ^ 0x80; + ps0 = (signed char) * op0 ^ 0x80; + qs0 = (signed char) * oq0 ^ 0x80; + qs1 = (signed char) * oq1 ^ 0x80; + + /* add outer taps if we have high edge variance */ + filter_value = vp8_signed_char_clamp(ps1 - qs1); + filter_value &= hev; + + /* inner taps */ + filter_value = vp8_signed_char_clamp(filter_value + 3 * (qs0 - ps0)); + filter_value &= mask; + + /* save bottom 3 bits so that we round one side +4 and the other +3 + * if it equals 4 we'll set to adjust by -1 to account for the fact + * we'd round 3 the other way + */ + Filter1 = vp8_signed_char_clamp(filter_value + 4); + Filter2 = vp8_signed_char_clamp(filter_value + 3); + Filter1 >>= 3; + Filter2 >>= 3; + u = vp8_signed_char_clamp(qs0 - Filter1); + *oq0 = u ^ 0x80; + u = vp8_signed_char_clamp(ps0 + Filter2); + *op0 = u ^ 0x80; + filter_value = Filter1; + + /* outer tap adjustments */ + filter_value += 1; + filter_value >>= 1; + filter_value &= ~hev; + + u = vp8_signed_char_clamp(qs1 - filter_value); + *oq1 = u ^ 0x80; + u = vp8_signed_char_clamp(ps1 + filter_value); + *op1 = u ^ 0x80; + +} +void vp8_loop_filter_horizontal_edge_c +( + unsigned char *s, + int p, /* pitch */ + const unsigned char *blimit, + const unsigned char *limit, + const unsigned char *thresh, + int count +) +{ + int hev = 0; /* high edge variance */ + signed char mask = 0; + int i = 0; + + /* loop filter designed to work using chars so that we can make maximum use + * of 8 bit simd instructions. + */ + do + { + mask = vp8_filter_mask(limit[0], blimit[0], + s[-4*p], s[-3*p], s[-2*p], s[-1*p], + s[0*p], s[1*p], s[2*p], s[3*p]); + + hev = vp8_hevmask(thresh[0], s[-2*p], s[-1*p], s[0*p], s[1*p]); + + vp8_filter(mask, hev, s - 2 * p, s - 1 * p, s, s + 1 * p); + + ++s; + } + while (++i < count * 8); +} + +void vp8_loop_filter_vertical_edge_c +( + unsigned char *s, + int p, + const unsigned char *blimit, + const unsigned char *limit, + const unsigned char *thresh, + int count +) +{ + int hev = 0; /* high edge variance */ + signed char mask = 0; + int i = 0; + + /* loop filter designed to work using chars so that we can make maximum use + * of 8 bit simd instructions. + */ + do + { + mask = vp8_filter_mask(limit[0], blimit[0], + s[-4], s[-3], s[-2], s[-1], s[0], s[1], s[2], s[3]); + + hev = vp8_hevmask(thresh[0], s[-2], s[-1], s[0], s[1]); + + vp8_filter(mask, hev, s - 2, s - 1, s, s + 1); + + s += p; + } + while (++i < count * 8); +} + +static void vp8_mbfilter(signed char mask, uc hev, + uc *op2, uc *op1, uc *op0, uc *oq0, uc *oq1, uc *oq2) +{ + signed char s, u; + signed char filter_value, Filter1, Filter2; + signed char ps2 = (signed char) * op2 ^ 0x80; + signed char ps1 = (signed char) * op1 ^ 0x80; + signed char ps0 = (signed char) * op0 ^ 0x80; + signed char qs0 = (signed char) * oq0 ^ 0x80; + signed char qs1 = (signed char) * oq1 ^ 0x80; + signed char qs2 = (signed char) * oq2 ^ 0x80; + + /* add outer taps if we have high edge variance */ + filter_value = vp8_signed_char_clamp(ps1 - qs1); + filter_value = vp8_signed_char_clamp(filter_value + 3 * (qs0 - ps0)); + filter_value &= mask; + + Filter2 = filter_value; + Filter2 &= hev; + + /* save bottom 3 bits so that we round one side +4 and the other +3 */ + Filter1 = vp8_signed_char_clamp(Filter2 + 4); + Filter2 = vp8_signed_char_clamp(Filter2 + 3); + Filter1 >>= 3; + Filter2 >>= 3; + qs0 = vp8_signed_char_clamp(qs0 - Filter1); + ps0 = vp8_signed_char_clamp(ps0 + Filter2); + + + /* only apply wider filter if not high edge variance */ + filter_value &= ~hev; + Filter2 = filter_value; + + /* roughly 3/7th difference across boundary */ + u = vp8_signed_char_clamp((63 + Filter2 * 27) >> 7); + s = vp8_signed_char_clamp(qs0 - u); + *oq0 = s ^ 0x80; + s = vp8_signed_char_clamp(ps0 + u); + *op0 = s ^ 0x80; + + /* roughly 2/7th difference across boundary */ + u = vp8_signed_char_clamp((63 + Filter2 * 18) >> 7); + s = vp8_signed_char_clamp(qs1 - u); + *oq1 = s ^ 0x80; + s = vp8_signed_char_clamp(ps1 + u); + *op1 = s ^ 0x80; + + /* roughly 1/7th difference across boundary */ + u = vp8_signed_char_clamp((63 + Filter2 * 9) >> 7); + s = vp8_signed_char_clamp(qs2 - u); + *oq2 = s ^ 0x80; + s = vp8_signed_char_clamp(ps2 + u); + *op2 = s ^ 0x80; +} + +void vp8_mbloop_filter_horizontal_edge_c +( + unsigned char *s, + int p, + const unsigned char *blimit, + const unsigned char *limit, + const unsigned char *thresh, + int count +) +{ + signed char hev = 0; /* high edge variance */ + signed char mask = 0; + int i = 0; + + /* loop filter designed to work using chars so that we can make maximum use + * of 8 bit simd instructions. + */ + do + { + + mask = vp8_filter_mask(limit[0], blimit[0], + s[-4*p], s[-3*p], s[-2*p], s[-1*p], + s[0*p], s[1*p], s[2*p], s[3*p]); + + hev = vp8_hevmask(thresh[0], s[-2*p], s[-1*p], s[0*p], s[1*p]); + + vp8_mbfilter(mask, hev, s - 3 * p, s - 2 * p, s - 1 * p, s, s + 1 * p, s + 2 * p); + + ++s; + } + while (++i < count * 8); + +} + + +void vp8_mbloop_filter_vertical_edge_c +( + unsigned char *s, + int p, + const unsigned char *blimit, + const unsigned char *limit, + const unsigned char *thresh, + int count +) +{ + signed char hev = 0; /* high edge variance */ + signed char mask = 0; + int i = 0; + + do + { + + mask = vp8_filter_mask(limit[0], blimit[0], + s[-4], s[-3], s[-2], s[-1], s[0], s[1], s[2], s[3]); + + hev = vp8_hevmask(thresh[0], s[-2], s[-1], s[0], s[1]); + + vp8_mbfilter(mask, hev, s - 3, s - 2, s - 1, s, s + 1, s + 2); + + s += p; + } + while (++i < count * 8); + +} + +/* should we apply any filter at all ( 11111111 yes, 00000000 no) */ +static signed char vp8_simple_filter_mask(uc blimit, uc p1, uc p0, uc q0, uc q1) +{ +/* Why does this cause problems for win32? + * error C2143: syntax error : missing ';' before 'type' + * (void) limit; + */ + signed char mask = (abs(p0 - q0) * 2 + abs(p1 - q1) / 2 <= blimit) * -1; + return mask; +} + +static void vp8_simple_filter(signed char mask, uc *op1, uc *op0, uc *oq0, uc *oq1) +{ + signed char filter_value, Filter1, Filter2; + signed char p1 = (signed char) * op1 ^ 0x80; + signed char p0 = (signed char) * op0 ^ 0x80; + signed char q0 = (signed char) * oq0 ^ 0x80; + signed char q1 = (signed char) * oq1 ^ 0x80; + signed char u; + + filter_value = vp8_signed_char_clamp(p1 - q1); + filter_value = vp8_signed_char_clamp(filter_value + 3 * (q0 - p0)); + filter_value &= mask; + + /* save bottom 3 bits so that we round one side +4 and the other +3 */ + Filter1 = vp8_signed_char_clamp(filter_value + 4); + Filter1 >>= 3; + u = vp8_signed_char_clamp(q0 - Filter1); + *oq0 = u ^ 0x80; + + Filter2 = vp8_signed_char_clamp(filter_value + 3); + Filter2 >>= 3; + u = vp8_signed_char_clamp(p0 + Filter2); + *op0 = u ^ 0x80; +} + +void vp8_loop_filter_simple_horizontal_edge_c +( + unsigned char *s, + int p, + const unsigned char *blimit +) +{ + signed char mask = 0; + int i = 0; + + do + { + mask = vp8_simple_filter_mask(blimit[0], s[-2*p], s[-1*p], s[0*p], s[1*p]); + vp8_simple_filter(mask, s - 2 * p, s - 1 * p, s, s + 1 * p); + ++s; + } + while (++i < 16); +} + +void vp8_loop_filter_simple_vertical_edge_c +( + unsigned char *s, + int p, + const unsigned char *blimit +) +{ + signed char mask = 0; + int i = 0; + + do + { + mask = vp8_simple_filter_mask(blimit[0], s[-2], s[-1], s[0], s[1]); + vp8_simple_filter(mask, s - 2, s - 1, s, s + 1); + s += p; + } + while (++i < 16); + +} + +/* Horizontal MB filtering */ +void vp8_loop_filter_mbh_c(unsigned char *y_ptr, unsigned char *u_ptr, + unsigned char *v_ptr, int y_stride, int uv_stride, + loop_filter_info *lfi) +{ + vp8_mbloop_filter_horizontal_edge_c(y_ptr, y_stride, lfi->mblim, lfi->lim, lfi->hev_thr, 2); + + if (u_ptr) + vp8_mbloop_filter_horizontal_edge_c(u_ptr, uv_stride, lfi->mblim, lfi->lim, lfi->hev_thr, 1); + + if (v_ptr) + vp8_mbloop_filter_horizontal_edge_c(v_ptr, uv_stride, lfi->mblim, lfi->lim, lfi->hev_thr, 1); +} + +/* Vertical MB Filtering */ +void vp8_loop_filter_mbv_c(unsigned char *y_ptr, unsigned char *u_ptr, + unsigned char *v_ptr, int y_stride, int uv_stride, + loop_filter_info *lfi) +{ + vp8_mbloop_filter_vertical_edge_c(y_ptr, y_stride, lfi->mblim, lfi->lim, lfi->hev_thr, 2); + + if (u_ptr) + vp8_mbloop_filter_vertical_edge_c(u_ptr, uv_stride, lfi->mblim, lfi->lim, lfi->hev_thr, 1); + + if (v_ptr) + vp8_mbloop_filter_vertical_edge_c(v_ptr, uv_stride, lfi->mblim, lfi->lim, lfi->hev_thr, 1); +} + +/* Horizontal B Filtering */ +void vp8_loop_filter_bh_c(unsigned char *y_ptr, unsigned char *u_ptr, + unsigned char *v_ptr, int y_stride, int uv_stride, + loop_filter_info *lfi) +{ + vp8_loop_filter_horizontal_edge_c(y_ptr + 4 * y_stride, y_stride, lfi->blim, lfi->lim, lfi->hev_thr, 2); + vp8_loop_filter_horizontal_edge_c(y_ptr + 8 * y_stride, y_stride, lfi->blim, lfi->lim, lfi->hev_thr, 2); + vp8_loop_filter_horizontal_edge_c(y_ptr + 12 * y_stride, y_stride, lfi->blim, lfi->lim, lfi->hev_thr, 2); + + if (u_ptr) + vp8_loop_filter_horizontal_edge_c(u_ptr + 4 * uv_stride, uv_stride, lfi->blim, lfi->lim, lfi->hev_thr, 1); + + if (v_ptr) + vp8_loop_filter_horizontal_edge_c(v_ptr + 4 * uv_stride, uv_stride, lfi->blim, lfi->lim, lfi->hev_thr, 1); +} + +void vp8_loop_filter_bhs_c(unsigned char *y_ptr, int y_stride, + const unsigned char *blimit) +{ + vp8_loop_filter_simple_horizontal_edge_c(y_ptr + 4 * y_stride, y_stride, blimit); + vp8_loop_filter_simple_horizontal_edge_c(y_ptr + 8 * y_stride, y_stride, blimit); + vp8_loop_filter_simple_horizontal_edge_c(y_ptr + 12 * y_stride, y_stride, blimit); +} + +/* Vertical B Filtering */ +void vp8_loop_filter_bv_c(unsigned char *y_ptr, unsigned char *u_ptr, + unsigned char *v_ptr, int y_stride, int uv_stride, + loop_filter_info *lfi) +{ + vp8_loop_filter_vertical_edge_c(y_ptr + 4, y_stride, lfi->blim, lfi->lim, lfi->hev_thr, 2); + vp8_loop_filter_vertical_edge_c(y_ptr + 8, y_stride, lfi->blim, lfi->lim, lfi->hev_thr, 2); + vp8_loop_filter_vertical_edge_c(y_ptr + 12, y_stride, lfi->blim, lfi->lim, lfi->hev_thr, 2); + + if (u_ptr) + vp8_loop_filter_vertical_edge_c(u_ptr + 4, uv_stride, lfi->blim, lfi->lim, lfi->hev_thr, 1); + + if (v_ptr) + vp8_loop_filter_vertical_edge_c(v_ptr + 4, uv_stride, lfi->blim, lfi->lim, lfi->hev_thr, 1); +} + +void vp8_loop_filter_bvs_c(unsigned char *y_ptr, int y_stride, + const unsigned char *blimit) +{ + vp8_loop_filter_simple_vertical_edge_c(y_ptr + 4, y_stride, blimit); + vp8_loop_filter_simple_vertical_edge_c(y_ptr + 8, y_stride, blimit); + vp8_loop_filter_simple_vertical_edge_c(y_ptr + 12, y_stride, blimit); +} |