| /* |
| * ScreenPressor decoder |
| * |
| * Copyright (c) 2017 Paul B Mahol |
| * |
| * 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 |
| */ |
| |
| #ifndef AVCODEC_SCPR_H |
| #define AVCODEC_SCPR_H |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include "avcodec.h" |
| #include "bytestream.h" |
| #include "internal.h" |
| #include "scpr3.h" |
| |
| typedef struct RangeCoder { |
| uint32_t code; |
| uint32_t range; |
| uint32_t code1; |
| } RangeCoder; |
| |
| typedef struct PixelModel { |
| uint32_t freq[256]; |
| uint32_t lookup[16]; |
| uint32_t total_freq; |
| } PixelModel; |
| |
| typedef struct SCPRContext { |
| int version; |
| AVFrame *last_frame; |
| AVFrame *current_frame; |
| GetByteContext gb; |
| RangeCoder rc; |
| PixelModel pixel_model[3][4096]; |
| uint32_t op_model[6][7]; |
| uint32_t run_model[6][257]; |
| uint32_t range_model[257]; |
| uint32_t count_model[257]; |
| uint32_t fill_model[6]; |
| uint32_t sxy_model[4][17]; |
| uint32_t mv_model[2][513]; |
| uint32_t nbx, nby; |
| uint32_t nbcount; |
| uint32_t *blocks; |
| uint32_t cbits; |
| int cxshift; |
| |
| PixelModel3 pixel_model3[3][4096]; |
| RunModel3 run_model3[6]; |
| RunModel3 range_model3; |
| RunModel3 count_model3; |
| FillModel3 fill_model3; |
| SxyModel3 sxy_model3[4]; |
| MVModel3 mv_model3[2]; |
| OpModel3 op_model3[6]; |
| |
| int (*get_freq)(RangeCoder *rc, uint32_t total_freq, uint32_t *freq); |
| int (*decode)(GetByteContext *gb, RangeCoder *rc, uint32_t cumFreq, uint32_t freq, uint32_t total_freq); |
| } SCPRContext; |
| |
| static int decode_run_i(AVCodecContext *avctx, uint32_t ptype, int run, |
| int *px, int *py, uint32_t clr, uint32_t *dst, |
| int linesize, uint32_t *plx, uint32_t *ply, |
| uint32_t backstep, int off, int *cx, int *cx1) |
| { |
| uint32_t r, g, b; |
| int z; |
| int x = *px, |
| y = *py; |
| uint32_t lx = *plx, |
| ly = *ply; |
| |
| if (y >= avctx->height) |
| return AVERROR_INVALIDDATA; |
| |
| switch (ptype) { |
| case 0: |
| while (run-- > 0) { |
| dst[y * linesize + x] = clr; |
| lx = x; |
| ly = y; |
| (x)++; |
| if (x >= avctx->width) { |
| x = 0; |
| (y)++; |
| if (y >= avctx->height && run) |
| return AVERROR_INVALIDDATA; |
| } |
| } |
| break; |
| case 1: |
| while (run-- > 0) { |
| dst[y * linesize + x] = dst[ly * linesize + lx]; |
| lx = x; |
| ly = y; |
| (x)++; |
| if (x >= avctx->width) { |
| x = 0; |
| (y)++; |
| if (y >= avctx->height && run) |
| return AVERROR_INVALIDDATA; |
| } |
| } |
| clr = dst[ly * linesize + lx]; |
| break; |
| case 2: |
| if (y < 1) |
| return AVERROR_INVALIDDATA; |
| |
| while (run-- > 0) { |
| clr = dst[y * linesize + x + off + 1]; |
| dst[y * linesize + x] = clr; |
| lx = x; |
| ly = y; |
| (x)++; |
| if (x >= avctx->width) { |
| x = 0; |
| (y)++; |
| if (y >= avctx->height && run) |
| return AVERROR_INVALIDDATA; |
| } |
| } |
| break; |
| case 4: |
| if (y < 1 || (y == 1 && x == 0)) |
| return AVERROR_INVALIDDATA; |
| |
| while (run-- > 0) { |
| uint8_t *odst = (uint8_t *)dst; |
| int off1 = (ly * linesize + lx) * 4; |
| int off2 = ((y * linesize + x) + off) * 4; |
| |
| if (x == 0) { |
| z = backstep * 4; |
| } else { |
| z = 0; |
| } |
| |
| r = odst[off1] + |
| odst[off2 + 4] - |
| odst[off2 - z ]; |
| g = odst[off1 + 1] + |
| odst[off2 + 5] - |
| odst[off2 - z + 1]; |
| b = odst[off1 + 2] + |
| odst[off2 + 6] - |
| odst[off2 - z + 2]; |
| clr = ((b & 0xFF) << 16) + ((g & 0xFF) << 8) + (r & 0xFF); |
| dst[y * linesize + x] = clr; |
| lx = x; |
| ly = y; |
| (x)++; |
| if (x >= avctx->width) { |
| x = 0; |
| (y)++; |
| if (y >= avctx->height && run) |
| return AVERROR_INVALIDDATA; |
| } |
| } |
| break; |
| case 5: |
| if (y < 1 || (y == 1 && x == 0)) |
| return AVERROR_INVALIDDATA; |
| |
| while (run-- > 0) { |
| if (x == 0) { |
| z = backstep; |
| } else { |
| z = 0; |
| } |
| |
| clr = dst[y * linesize + x + off - z]; |
| dst[y * linesize + x] = clr; |
| lx = x; |
| ly = y; |
| (x)++; |
| if (x >= avctx->width) { |
| x = 0; |
| (y)++; |
| if (y >= avctx->height && run) |
| return AVERROR_INVALIDDATA; |
| } |
| } |
| break; |
| } |
| |
| *px = x; |
| *py = y; |
| *plx= lx; |
| *ply= ly; |
| |
| if (avctx->bits_per_coded_sample == 16) { |
| *cx1 = (clr & 0x3F00) >> 2; |
| *cx = (clr & 0x3FFFFF) >> 16; |
| } else { |
| *cx1 = (clr & 0xFC00) >> 4; |
| *cx = (clr & 0xFFFFFF) >> 18; |
| } |
| |
| return 0; |
| } |
| |
| static int decode_run_p(AVCodecContext *avctx, uint32_t ptype, int run, |
| int x, int y, uint32_t clr, |
| uint32_t *dst, uint32_t *prev, |
| int linesize, int plinesize, |
| uint32_t *bx, uint32_t *by, |
| uint32_t backstep, int sx1, int sx2, |
| int *cx, int *cx1) |
| { |
| uint32_t r, g, b; |
| int z; |
| |
| switch (ptype) { |
| case 0: |
| while (run-- > 0) { |
| if (*by >= avctx->height) |
| return AVERROR_INVALIDDATA; |
| |
| dst[*by * linesize + *bx] = clr; |
| (*bx)++; |
| if (*bx >= x * 16 + sx2 || *bx >= avctx->width) { |
| *bx = x * 16 + sx1; |
| (*by)++; |
| } |
| } |
| break; |
| case 1: |
| while (run-- > 0) { |
| if (*bx == 0) { |
| if (*by < 1) |
| return AVERROR_INVALIDDATA; |
| z = backstep; |
| } else { |
| z = 0; |
| } |
| |
| if (*by >= avctx->height) |
| return AVERROR_INVALIDDATA; |
| |
| clr = dst[*by * linesize + *bx - 1 - z]; |
| dst[*by * linesize + *bx] = clr; |
| (*bx)++; |
| if (*bx >= x * 16 + sx2 || *bx >= avctx->width) { |
| *bx = x * 16 + sx1; |
| (*by)++; |
| } |
| } |
| break; |
| case 2: |
| while (run-- > 0) { |
| if (*by < 1 || *by >= avctx->height) |
| return AVERROR_INVALIDDATA; |
| |
| clr = dst[(*by - 1) * linesize + *bx]; |
| dst[*by * linesize + *bx] = clr; |
| (*bx)++; |
| if (*bx >= x * 16 + sx2 || *bx >= avctx->width) { |
| *bx = x * 16 + sx1; |
| (*by)++; |
| } |
| } |
| break; |
| case 3: |
| while (run-- > 0) { |
| if (*by >= avctx->height) |
| return AVERROR_INVALIDDATA; |
| |
| clr = prev[*by * plinesize + *bx]; |
| dst[*by * linesize + *bx] = clr; |
| (*bx)++; |
| if (*bx >= x * 16 + sx2 || *bx >= avctx->width) { |
| *bx = x * 16 + sx1; |
| (*by)++; |
| } |
| } |
| break; |
| case 4: |
| while (run-- > 0) { |
| uint8_t *odst = (uint8_t *)dst; |
| |
| if (*by < 1 || *by >= avctx->height) |
| return AVERROR_INVALIDDATA; |
| |
| if (*bx == 0) { |
| if (*by < 2) |
| return AVERROR_INVALIDDATA; |
| z = backstep; |
| } else { |
| z = 0; |
| } |
| |
| r = odst[((*by - 1) * linesize + *bx) * 4] + |
| odst[(*by * linesize + *bx - 1 - z) * 4] - |
| odst[((*by - 1) * linesize + *bx - 1 - z) * 4]; |
| g = odst[((*by - 1) * linesize + *bx) * 4 + 1] + |
| odst[(*by * linesize + *bx - 1 - z) * 4 + 1] - |
| odst[((*by - 1) * linesize + *bx - 1 - z) * 4 + 1]; |
| b = odst[((*by - 1) * linesize + *bx) * 4 + 2] + |
| odst[(*by * linesize + *bx - 1 - z) * 4 + 2] - |
| odst[((*by - 1) * linesize + *bx - 1 - z) * 4 + 2]; |
| clr = ((b & 0xFF) << 16) + ((g & 0xFF) << 8) + (r & 0xFF); |
| dst[*by * linesize + *bx] = clr; |
| (*bx)++; |
| if (*bx >= x * 16 + sx2 || *bx >= avctx->width) { |
| *bx = x * 16 + sx1; |
| (*by)++; |
| } |
| } |
| break; |
| case 5: |
| while (run-- > 0) { |
| if (*by < 1 || *by >= avctx->height) |
| return AVERROR_INVALIDDATA; |
| |
| if (*bx == 0) { |
| if (*by < 2) |
| return AVERROR_INVALIDDATA; |
| z = backstep; |
| } else { |
| z = 0; |
| } |
| |
| clr = dst[(*by - 1) * linesize + *bx - 1 - z]; |
| dst[*by * linesize + *bx] = clr; |
| (*bx)++; |
| if (*bx >= x * 16 + sx2 || *bx >= avctx->width) { |
| *bx = x * 16 + sx1; |
| (*by)++; |
| } |
| } |
| break; |
| } |
| |
| if (avctx->bits_per_coded_sample == 16) { |
| *cx1 = (clr & 0x3F00) >> 2; |
| *cx = (clr & 0x3FFFFF) >> 16; |
| } else { |
| *cx1 = (clr & 0xFC00) >> 4; |
| *cx = (clr & 0xFFFFFF) >> 18; |
| } |
| |
| return 0; |
| } |
| |
| #endif /* AVCODEC_SCPR_H */ |
