156 lines
5.7 KiB
C
Executable file
156 lines
5.7 KiB
C
Executable file
/*
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* Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder DSP routines
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*/
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#include "mss2dsp.h"
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#include "libavutil/common.h"
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static av_always_inline void mss2_blit_wmv9_template(uint8_t *dst,
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ptrdiff_t dst_stride,
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int gray,
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int use_mask,
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int maskcolor,
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const uint8_t *mask,
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ptrdiff_t mask_stride,
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const uint8_t *srcy,
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ptrdiff_t srcy_stride,
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const uint8_t *srcu,
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const uint8_t *srcv,
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ptrdiff_t srcuv_stride,
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int w, int h)
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{
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int i, j, k, r = -1;
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while (++r < h) {
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for (i = 0, j = 0, k = 0; i < w; j += (i & 1), i++, k += 3) {
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if (!use_mask || mask[i] == maskcolor) {
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if (gray) {
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dst[k] = dst[k + 1] = dst[k + 2] = 0x80;
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} else {
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int y = srcy[i];
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int u = srcu[j] - 128;
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int v = srcv[j] - 128;
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dst[k] = av_clip_uint8(y + ( 91881 * v + 32768 >> 16));
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dst[k + 1] = av_clip_uint8(y + (-22554 * u - 46802 * v + 32768 >> 16));
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dst[k + 2] = av_clip_uint8(y + (116130 * u + 32768 >> 16));
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}
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}
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}
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mask += mask_stride;
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dst += dst_stride;
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srcy += srcy_stride;
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srcu += srcuv_stride * (r & 1);
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srcv += srcuv_stride * (r & 1);
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}
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}
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static void mss2_blit_wmv9_c(uint8_t *dst, ptrdiff_t dst_stride,
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const uint8_t *srcy, ptrdiff_t srcy_stride,
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const uint8_t *srcu, const uint8_t *srcv,
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ptrdiff_t srcuv_stride, int w, int h)
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{
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mss2_blit_wmv9_template(dst, dst_stride, 0, 0,
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0, NULL, 0,
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srcy, srcy_stride,
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srcu, srcv, srcuv_stride,
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w, h);
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}
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static void mss2_blit_wmv9_masked_c(uint8_t *dst, ptrdiff_t dst_stride,
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int maskcolor, const uint8_t *mask,
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ptrdiff_t mask_stride,
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const uint8_t *srcy, ptrdiff_t srcy_stride,
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const uint8_t *srcu, const uint8_t *srcv,
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ptrdiff_t srcuv_stride, int w, int h)
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{
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mss2_blit_wmv9_template(dst, dst_stride, 0, 1,
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maskcolor, mask, mask_stride,
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srcy, srcy_stride,
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srcu, srcv, srcuv_stride,
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w, h);
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}
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static void mss2_gray_fill_masked_c(uint8_t *dst, ptrdiff_t dst_stride,
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int maskcolor, const uint8_t *mask,
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ptrdiff_t mask_stride, int w, int h)
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{
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mss2_blit_wmv9_template(dst, dst_stride, 1, 1,
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maskcolor, mask, mask_stride,
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NULL, 0,
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NULL, NULL, 0,
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w, h);
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}
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static void upsample_plane_c(uint8_t *plane, ptrdiff_t plane_stride, int w, int h)
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{
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uint8_t *src1, *src2, *dst1, *dst2, *p, a, b;
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int i, j;
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if(!w || !h)
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return;
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w += (w & 1);
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h += (h & 1);
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j = h - 1;
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memcpy(plane + plane_stride * j,
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plane + plane_stride * (j >> 1),
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w);
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while ((j -= 2) > 0) {
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dst1 = plane + plane_stride * (j + 1);
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dst2 = plane + plane_stride * j;
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src1 = plane + plane_stride * ((j + 1) >> 1);
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src2 = plane + plane_stride * ( j >> 1);
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for (i = (w - 1) >> 1; i >= 0; i--) {
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a = src1[i];
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b = src2[i];
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dst1[i] = (3 * a + b + 2) >> 2;
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dst2[i] = (a + 3 * b + 2) >> 2;
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}
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}
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for (j = h - 1; j >= 0; j--) {
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p = plane + plane_stride * j;
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i = w - 1;
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p[i] = p[i >> 1];
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while ((i -= 2) > 0) {
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a = p[ i >> 1];
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b = p[(i + 1) >> 1];
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p[i] = (3 * a + b + 1) >> 2;
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p[i + 1] = (a + 3 * b + 1) >> 2;
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}
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}
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}
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av_cold void ff_mss2dsp_init(MSS2DSPContext* dsp)
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{
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dsp->mss2_blit_wmv9 = mss2_blit_wmv9_c;
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dsp->mss2_blit_wmv9_masked = mss2_blit_wmv9_masked_c;
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dsp->mss2_gray_fill_masked = mss2_gray_fill_masked_c;
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dsp->upsample_plane = upsample_plane_c;
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}
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