| 1 | /* |
| 2 | * Delphine Software International CIN video decoder |
| 3 | * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net) |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | /** |
| 23 | * @file |
| 24 | * Delphine Software International CIN video decoder |
| 25 | */ |
| 26 | |
| 27 | #include "avcodec.h" |
| 28 | #include "bytestream.h" |
| 29 | #include "internal.h" |
| 30 | |
| 31 | typedef enum CinVideoBitmapIndex { |
| 32 | CIN_CUR_BMP = 0, /* current */ |
| 33 | CIN_PRE_BMP = 1, /* previous */ |
| 34 | CIN_INT_BMP = 2 /* intermediate */ |
| 35 | } CinVideoBitmapIndex; |
| 36 | |
| 37 | typedef struct CinVideoContext { |
| 38 | AVCodecContext *avctx; |
| 39 | AVFrame *frame; |
| 40 | unsigned int bitmap_size; |
| 41 | uint32_t palette[256]; |
| 42 | uint8_t *bitmap_table[3]; |
| 43 | } CinVideoContext; |
| 44 | |
| 45 | static av_cold void destroy_buffers(CinVideoContext *cin) |
| 46 | { |
| 47 | int i; |
| 48 | |
| 49 | for (i = 0; i < 3; ++i) |
| 50 | av_freep(&cin->bitmap_table[i]); |
| 51 | } |
| 52 | |
| 53 | static av_cold int allocate_buffers(CinVideoContext *cin) |
| 54 | { |
| 55 | int i; |
| 56 | |
| 57 | for (i = 0; i < 3; ++i) { |
| 58 | cin->bitmap_table[i] = av_mallocz(cin->bitmap_size); |
| 59 | if (!cin->bitmap_table[i]) { |
| 60 | av_log(cin->avctx, AV_LOG_ERROR, "Can't allocate bitmap buffers.\n"); |
| 61 | destroy_buffers(cin); |
| 62 | return AVERROR(ENOMEM); |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | return 0; |
| 67 | } |
| 68 | |
| 69 | static av_cold int cinvideo_decode_init(AVCodecContext *avctx) |
| 70 | { |
| 71 | CinVideoContext *cin = avctx->priv_data; |
| 72 | |
| 73 | cin->avctx = avctx; |
| 74 | avctx->pix_fmt = AV_PIX_FMT_PAL8; |
| 75 | |
| 76 | cin->frame = av_frame_alloc(); |
| 77 | if (!cin->frame) |
| 78 | return AVERROR(ENOMEM); |
| 79 | |
| 80 | cin->bitmap_size = avctx->width * avctx->height; |
| 81 | if (allocate_buffers(cin)) |
| 82 | return AVERROR(ENOMEM); |
| 83 | |
| 84 | return 0; |
| 85 | } |
| 86 | |
| 87 | static void cin_apply_delta_data(const unsigned char *src, unsigned char *dst, |
| 88 | int size) |
| 89 | { |
| 90 | while (size--) |
| 91 | *dst++ += *src++; |
| 92 | } |
| 93 | |
| 94 | static int cin_decode_huffman(const unsigned char *src, int src_size, |
| 95 | unsigned char *dst, int dst_size) |
| 96 | { |
| 97 | int b, huff_code = 0; |
| 98 | unsigned char huff_code_table[15]; |
| 99 | unsigned char *dst_cur = dst; |
| 100 | unsigned char *dst_end = dst + dst_size; |
| 101 | const unsigned char *src_end = src + src_size; |
| 102 | |
| 103 | memcpy(huff_code_table, src, 15); |
| 104 | src += 15; |
| 105 | |
| 106 | while (src < src_end) { |
| 107 | huff_code = *src++; |
| 108 | if ((huff_code >> 4) == 15) { |
| 109 | b = huff_code << 4; |
| 110 | huff_code = *src++; |
| 111 | *dst_cur++ = b | (huff_code >> 4); |
| 112 | } else |
| 113 | *dst_cur++ = huff_code_table[huff_code >> 4]; |
| 114 | if (dst_cur >= dst_end) |
| 115 | break; |
| 116 | |
| 117 | huff_code &= 15; |
| 118 | if (huff_code == 15) { |
| 119 | *dst_cur++ = *src++; |
| 120 | } else |
| 121 | *dst_cur++ = huff_code_table[huff_code]; |
| 122 | if (dst_cur >= dst_end) |
| 123 | break; |
| 124 | } |
| 125 | |
| 126 | return dst_cur - dst; |
| 127 | } |
| 128 | |
| 129 | static int cin_decode_lzss(const unsigned char *src, int src_size, |
| 130 | unsigned char *dst, int dst_size) |
| 131 | { |
| 132 | uint16_t cmd; |
| 133 | int i, sz, offset, code; |
| 134 | unsigned char *dst_end = dst + dst_size, *dst_start = dst; |
| 135 | const unsigned char *src_end = src + src_size; |
| 136 | |
| 137 | while (src < src_end && dst < dst_end) { |
| 138 | code = *src++; |
| 139 | for (i = 0; i < 8 && src < src_end && dst < dst_end; ++i) { |
| 140 | if (code & (1 << i)) { |
| 141 | *dst++ = *src++; |
| 142 | } else { |
| 143 | cmd = AV_RL16(src); |
| 144 | src += 2; |
| 145 | offset = cmd >> 4; |
| 146 | if ((int)(dst - dst_start) < offset + 1) |
| 147 | return AVERROR_INVALIDDATA; |
| 148 | sz = (cmd & 0xF) + 2; |
| 149 | /* don't use memcpy/memmove here as the decoding routine |
| 150 | * (ab)uses buffer overlappings to repeat bytes in the |
| 151 | * destination */ |
| 152 | sz = FFMIN(sz, dst_end - dst); |
| 153 | while (sz--) { |
| 154 | *dst = *(dst - offset - 1); |
| 155 | ++dst; |
| 156 | } |
| 157 | } |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | return 0; |
| 162 | } |
| 163 | |
| 164 | static int cin_decode_rle(const unsigned char *src, int src_size, |
| 165 | unsigned char *dst, int dst_size) |
| 166 | { |
| 167 | int len, code; |
| 168 | unsigned char *dst_end = dst + dst_size; |
| 169 | const unsigned char *src_end = src + src_size; |
| 170 | |
| 171 | while (src + 1 < src_end && dst < dst_end) { |
| 172 | code = *src++; |
| 173 | if (code & 0x80) { |
| 174 | len = code - 0x7F; |
| 175 | memset(dst, *src++, FFMIN(len, dst_end - dst)); |
| 176 | } else { |
| 177 | len = code + 1; |
| 178 | if (len > src_end-src) { |
| 179 | av_log(NULL, AV_LOG_ERROR, "RLE overread\n"); |
| 180 | return AVERROR_INVALIDDATA; |
| 181 | } |
| 182 | memcpy(dst, src, FFMIN3(len, dst_end - dst, src_end - src)); |
| 183 | src += len; |
| 184 | } |
| 185 | dst += len; |
| 186 | } |
| 187 | return 0; |
| 188 | } |
| 189 | |
| 190 | static int cinvideo_decode_frame(AVCodecContext *avctx, |
| 191 | void *data, int *got_frame, |
| 192 | AVPacket *avpkt) |
| 193 | { |
| 194 | const uint8_t *buf = avpkt->data; |
| 195 | int buf_size = avpkt->size; |
| 196 | CinVideoContext *cin = avctx->priv_data; |
| 197 | int i, y, palette_type, palette_colors_count, |
| 198 | bitmap_frame_type, bitmap_frame_size, res = 0; |
| 199 | |
| 200 | palette_type = buf[0]; |
| 201 | palette_colors_count = AV_RL16(buf + 1); |
| 202 | bitmap_frame_type = buf[3]; |
| 203 | buf += 4; |
| 204 | |
| 205 | bitmap_frame_size = buf_size - 4; |
| 206 | |
| 207 | /* handle palette */ |
| 208 | if (bitmap_frame_size < palette_colors_count * (3 + (palette_type != 0))) |
| 209 | return AVERROR_INVALIDDATA; |
| 210 | if (palette_type == 0) { |
| 211 | if (palette_colors_count > 256) |
| 212 | return AVERROR_INVALIDDATA; |
| 213 | for (i = 0; i < palette_colors_count; ++i) { |
| 214 | cin->palette[i] = 0xFFU << 24 | bytestream_get_le24(&buf); |
| 215 | bitmap_frame_size -= 3; |
| 216 | } |
| 217 | } else { |
| 218 | for (i = 0; i < palette_colors_count; ++i) { |
| 219 | cin->palette[buf[0]] = 0xFFU << 24 | AV_RL24(buf + 1); |
| 220 | buf += 4; |
| 221 | bitmap_frame_size -= 4; |
| 222 | } |
| 223 | } |
| 224 | |
| 225 | /* note: the decoding routines below assumes that |
| 226 | * surface.width = surface.pitch */ |
| 227 | switch (bitmap_frame_type) { |
| 228 | case 9: |
| 229 | cin_decode_rle(buf, bitmap_frame_size, |
| 230 | cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size); |
| 231 | break; |
| 232 | case 34: |
| 233 | cin_decode_rle(buf, bitmap_frame_size, |
| 234 | cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size); |
| 235 | cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP], |
| 236 | cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size); |
| 237 | break; |
| 238 | case 35: |
| 239 | bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size, |
| 240 | cin->bitmap_table[CIN_INT_BMP], cin->bitmap_size); |
| 241 | cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size, |
| 242 | cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size); |
| 243 | break; |
| 244 | case 36: |
| 245 | bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size, |
| 246 | cin->bitmap_table[CIN_INT_BMP], |
| 247 | cin->bitmap_size); |
| 248 | cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size, |
| 249 | cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size); |
| 250 | cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP], |
| 251 | cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size); |
| 252 | break; |
| 253 | case 37: |
| 254 | cin_decode_huffman(buf, bitmap_frame_size, |
| 255 | cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size); |
| 256 | break; |
| 257 | case 38: |
| 258 | res = cin_decode_lzss(buf, bitmap_frame_size, |
| 259 | cin->bitmap_table[CIN_CUR_BMP], |
| 260 | cin->bitmap_size); |
| 261 | if (res < 0) |
| 262 | return res; |
| 263 | break; |
| 264 | case 39: |
| 265 | res = cin_decode_lzss(buf, bitmap_frame_size, |
| 266 | cin->bitmap_table[CIN_CUR_BMP], |
| 267 | cin->bitmap_size); |
| 268 | if (res < 0) |
| 269 | return res; |
| 270 | cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP], |
| 271 | cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size); |
| 272 | break; |
| 273 | } |
| 274 | |
| 275 | if ((res = ff_reget_buffer(avctx, cin->frame)) < 0) |
| 276 | return res; |
| 277 | |
| 278 | memcpy(cin->frame->data[1], cin->palette, sizeof(cin->palette)); |
| 279 | cin->frame->palette_has_changed = 1; |
| 280 | for (y = 0; y < cin->avctx->height; ++y) |
| 281 | memcpy(cin->frame->data[0] + (cin->avctx->height - 1 - y) * cin->frame->linesize[0], |
| 282 | cin->bitmap_table[CIN_CUR_BMP] + y * cin->avctx->width, |
| 283 | cin->avctx->width); |
| 284 | |
| 285 | FFSWAP(uint8_t *, cin->bitmap_table[CIN_CUR_BMP], |
| 286 | cin->bitmap_table[CIN_PRE_BMP]); |
| 287 | |
| 288 | if ((res = av_frame_ref(data, cin->frame)) < 0) |
| 289 | return res; |
| 290 | |
| 291 | *got_frame = 1; |
| 292 | |
| 293 | return buf_size; |
| 294 | } |
| 295 | |
| 296 | static av_cold int cinvideo_decode_end(AVCodecContext *avctx) |
| 297 | { |
| 298 | CinVideoContext *cin = avctx->priv_data; |
| 299 | |
| 300 | av_frame_free(&cin->frame); |
| 301 | |
| 302 | destroy_buffers(cin); |
| 303 | |
| 304 | return 0; |
| 305 | } |
| 306 | |
| 307 | AVCodec ff_dsicinvideo_decoder = { |
| 308 | .name = "dsicinvideo", |
| 309 | .long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN video"), |
| 310 | .type = AVMEDIA_TYPE_VIDEO, |
| 311 | .id = AV_CODEC_ID_DSICINVIDEO, |
| 312 | .priv_data_size = sizeof(CinVideoContext), |
| 313 | .init = cinvideo_decode_init, |
| 314 | .close = cinvideo_decode_end, |
| 315 | .decode = cinvideo_decode_frame, |
| 316 | .capabilities = CODEC_CAP_DR1, |
| 317 | }; |