| 1 | /* |
| 2 | * Binary text decoder |
| 3 | * eXtended BINary text (XBIN) decoder |
| 4 | * iCEDraw File decoder |
| 5 | * Copyright (c) 2010 Peter Ross (pross@xvid.org) |
| 6 | * |
| 7 | * This file is part of FFmpeg. |
| 8 | * |
| 9 | * FFmpeg is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU Lesser General Public |
| 11 | * License as published by the Free Software Foundation; either |
| 12 | * version 2.1 of the License, or (at your option) any later version. |
| 13 | * |
| 14 | * FFmpeg is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | * Lesser General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU Lesser General Public |
| 20 | * License along with FFmpeg; if not, write to the Free Software |
| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 22 | */ |
| 23 | |
| 24 | /** |
| 25 | * @file |
| 26 | * Binary text decoder |
| 27 | * eXtended BINary text (XBIN) decoder |
| 28 | * iCEDraw File decoder |
| 29 | */ |
| 30 | |
| 31 | #include "libavutil/intreadwrite.h" |
| 32 | #include "libavutil/xga_font_data.h" |
| 33 | #include "avcodec.h" |
| 34 | #include "cga_data.h" |
| 35 | #include "bintext.h" |
| 36 | #include "internal.h" |
| 37 | |
| 38 | typedef struct XbinContext { |
| 39 | AVFrame *frame; |
| 40 | int palette[16]; |
| 41 | int flags; |
| 42 | int font_height; |
| 43 | const uint8_t *font; |
| 44 | int x, y; |
| 45 | } XbinContext; |
| 46 | |
| 47 | static av_cold int decode_init(AVCodecContext *avctx) |
| 48 | { |
| 49 | XbinContext *s = avctx->priv_data; |
| 50 | uint8_t *p; |
| 51 | int i; |
| 52 | |
| 53 | avctx->pix_fmt = AV_PIX_FMT_PAL8; |
| 54 | p = avctx->extradata; |
| 55 | if (p) { |
| 56 | s->font_height = p[0]; |
| 57 | s->flags = p[1]; |
| 58 | p += 2; |
| 59 | if(avctx->extradata_size < 2 + (!!(s->flags & BINTEXT_PALETTE))*3*16 |
| 60 | + (!!(s->flags & BINTEXT_FONT))*s->font_height*256) { |
| 61 | av_log(avctx, AV_LOG_ERROR, "not enough extradata\n"); |
| 62 | return AVERROR_INVALIDDATA; |
| 63 | } |
| 64 | } else { |
| 65 | s->font_height = 8; |
| 66 | s->flags = 0; |
| 67 | } |
| 68 | |
| 69 | if ((s->flags & BINTEXT_PALETTE)) { |
| 70 | for (i = 0; i < 16; i++) { |
| 71 | s->palette[i] = 0xFF000000 | (AV_RB24(p) << 2) | ((AV_RB24(p) >> 4) & 0x30303); |
| 72 | p += 3; |
| 73 | } |
| 74 | } else { |
| 75 | for (i = 0; i < 16; i++) |
| 76 | s->palette[i] = 0xFF000000 | ff_cga_palette[i]; |
| 77 | } |
| 78 | |
| 79 | if ((s->flags & BINTEXT_FONT)) { |
| 80 | s->font = p; |
| 81 | } else { |
| 82 | switch(s->font_height) { |
| 83 | default: |
| 84 | av_log(avctx, AV_LOG_WARNING, "font height %i not supported\n", s->font_height); |
| 85 | s->font_height = 8; |
| 86 | case 8: |
| 87 | s->font = avpriv_cga_font; |
| 88 | break; |
| 89 | case 16: |
| 90 | s->font = avpriv_vga16_font; |
| 91 | break; |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | s->frame = av_frame_alloc(); |
| 96 | if (!s->frame) |
| 97 | return AVERROR(ENOMEM); |
| 98 | |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | #define DEFAULT_BG_COLOR 0 |
| 103 | av_unused static void hscroll(AVCodecContext *avctx) |
| 104 | { |
| 105 | XbinContext *s = avctx->priv_data; |
| 106 | if (s->y < avctx->height - s->font_height) { |
| 107 | s->y += s->font_height; |
| 108 | } else { |
| 109 | memmove(s->frame->data[0], s->frame->data[0] + s->font_height*s->frame->linesize[0], |
| 110 | (avctx->height - s->font_height)*s->frame->linesize[0]); |
| 111 | memset(s->frame->data[0] + (avctx->height - s->font_height)*s->frame->linesize[0], |
| 112 | DEFAULT_BG_COLOR, s->font_height * s->frame->linesize[0]); |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | #define FONT_WIDTH 8 |
| 117 | |
| 118 | /** |
| 119 | * Draw character to screen |
| 120 | */ |
| 121 | static void draw_char(AVCodecContext *avctx, int c, int a) |
| 122 | { |
| 123 | XbinContext *s = avctx->priv_data; |
| 124 | if (s->y > avctx->height - s->font_height) |
| 125 | return; |
| 126 | ff_draw_pc_font(s->frame->data[0] + s->y * s->frame->linesize[0] + s->x, |
| 127 | s->frame->linesize[0], s->font, s->font_height, c, |
| 128 | a & 0x0F, a >> 4); |
| 129 | s->x += FONT_WIDTH; |
| 130 | if (s->x > avctx->width - FONT_WIDTH) { |
| 131 | s->x = 0; |
| 132 | s->y += s->font_height; |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | static int decode_frame(AVCodecContext *avctx, |
| 137 | void *data, int *got_frame, |
| 138 | AVPacket *avpkt) |
| 139 | { |
| 140 | XbinContext *s = avctx->priv_data; |
| 141 | const uint8_t *buf = avpkt->data; |
| 142 | int buf_size = avpkt->size; |
| 143 | const uint8_t *buf_end = buf+buf_size; |
| 144 | int ret; |
| 145 | |
| 146 | s->x = s->y = 0; |
| 147 | if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) |
| 148 | return ret; |
| 149 | s->frame->pict_type = AV_PICTURE_TYPE_I; |
| 150 | s->frame->palette_has_changed = 1; |
| 151 | memcpy(s->frame->data[1], s->palette, 16 * 4); |
| 152 | |
| 153 | if (avctx->codec_id == AV_CODEC_ID_XBIN) { |
| 154 | while (buf + 2 < buf_end) { |
| 155 | int i,c,a; |
| 156 | int type = *buf >> 6; |
| 157 | int count = (*buf & 0x3F) + 1; |
| 158 | buf++; |
| 159 | switch (type) { |
| 160 | case 0: //no compression |
| 161 | for (i = 0; i < count && buf + 1 < buf_end; i++) { |
| 162 | draw_char(avctx, buf[0], buf[1]); |
| 163 | buf += 2; |
| 164 | } |
| 165 | break; |
| 166 | case 1: //character compression |
| 167 | c = *buf++; |
| 168 | for (i = 0; i < count && buf < buf_end; i++) |
| 169 | draw_char(avctx, c, *buf++); |
| 170 | break; |
| 171 | case 2: //attribute compression |
| 172 | a = *buf++; |
| 173 | for (i = 0; i < count && buf < buf_end; i++) |
| 174 | draw_char(avctx, *buf++, a); |
| 175 | break; |
| 176 | case 3: //character/attribute compression |
| 177 | c = *buf++; |
| 178 | a = *buf++; |
| 179 | for (i = 0; i < count && buf < buf_end; i++) |
| 180 | draw_char(avctx, c, a); |
| 181 | break; |
| 182 | } |
| 183 | } |
| 184 | } else if (avctx->codec_id == AV_CODEC_ID_IDF) { |
| 185 | while (buf + 2 < buf_end) { |
| 186 | if (AV_RL16(buf) == 1) { |
| 187 | int i; |
| 188 | if (buf + 6 > buf_end) |
| 189 | break; |
| 190 | for (i = 0; i < buf[2]; i++) |
| 191 | draw_char(avctx, buf[4], buf[5]); |
| 192 | buf += 6; |
| 193 | } else { |
| 194 | draw_char(avctx, buf[0], buf[1]); |
| 195 | buf += 2; |
| 196 | } |
| 197 | } |
| 198 | } else { |
| 199 | while (buf + 1 < buf_end) { |
| 200 | draw_char(avctx, buf[0], buf[1]); |
| 201 | buf += 2; |
| 202 | } |
| 203 | } |
| 204 | |
| 205 | if ((ret = av_frame_ref(data, s->frame)) < 0) |
| 206 | return ret; |
| 207 | *got_frame = 1; |
| 208 | return buf_size; |
| 209 | } |
| 210 | |
| 211 | static av_cold int decode_end(AVCodecContext *avctx) |
| 212 | { |
| 213 | XbinContext *s = avctx->priv_data; |
| 214 | |
| 215 | av_frame_free(&s->frame); |
| 216 | |
| 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | #if CONFIG_BINTEXT_DECODER |
| 221 | AVCodec ff_bintext_decoder = { |
| 222 | .name = "bintext", |
| 223 | .long_name = NULL_IF_CONFIG_SMALL("Binary text"), |
| 224 | .type = AVMEDIA_TYPE_VIDEO, |
| 225 | .id = AV_CODEC_ID_BINTEXT, |
| 226 | .priv_data_size = sizeof(XbinContext), |
| 227 | .init = decode_init, |
| 228 | .close = decode_end, |
| 229 | .decode = decode_frame, |
| 230 | .capabilities = CODEC_CAP_DR1, |
| 231 | }; |
| 232 | #endif |
| 233 | #if CONFIG_XBIN_DECODER |
| 234 | AVCodec ff_xbin_decoder = { |
| 235 | .name = "xbin", |
| 236 | .long_name = NULL_IF_CONFIG_SMALL("eXtended BINary text"), |
| 237 | .type = AVMEDIA_TYPE_VIDEO, |
| 238 | .id = AV_CODEC_ID_XBIN, |
| 239 | .priv_data_size = sizeof(XbinContext), |
| 240 | .init = decode_init, |
| 241 | .close = decode_end, |
| 242 | .decode = decode_frame, |
| 243 | .capabilities = CODEC_CAP_DR1, |
| 244 | }; |
| 245 | #endif |
| 246 | #if CONFIG_IDF_DECODER |
| 247 | AVCodec ff_idf_decoder = { |
| 248 | .name = "idf", |
| 249 | .long_name = NULL_IF_CONFIG_SMALL("iCEDraw text"), |
| 250 | .type = AVMEDIA_TYPE_VIDEO, |
| 251 | .id = AV_CODEC_ID_IDF, |
| 252 | .priv_data_size = sizeof(XbinContext), |
| 253 | .init = decode_init, |
| 254 | .close = decode_end, |
| 255 | .decode = decode_frame, |
| 256 | .capabilities = CODEC_CAP_DR1, |
| 257 | }; |
| 258 | #endif |