| 1 | /* |
| 2 | * Electronic Arts Madcow Video Decoder |
| 3 | * Copyright (c) 2007-2009 Peter Ross |
| 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 St, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | /** |
| 23 | * @file |
| 24 | * Electronic Arts Madcow Video Decoder |
| 25 | * @author Peter Ross <pross@xvid.org> |
| 26 | * |
| 27 | * @see technical details at |
| 28 | * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_MAD |
| 29 | */ |
| 30 | |
| 31 | #include "avcodec.h" |
| 32 | #include "bytestream.h" |
| 33 | #include "bswapdsp.h" |
| 34 | #include "get_bits.h" |
| 35 | #include "aandcttab.h" |
| 36 | #include "eaidct.h" |
| 37 | #include "idctdsp.h" |
| 38 | #include "internal.h" |
| 39 | #include "mpeg12.h" |
| 40 | #include "mpeg12data.h" |
| 41 | #include "libavutil/imgutils.h" |
| 42 | |
| 43 | #define EA_PREAMBLE_SIZE 8 |
| 44 | #define MADk_TAG MKTAG('M', 'A', 'D', 'k') /* MAD i-frame */ |
| 45 | #define MADm_TAG MKTAG('M', 'A', 'D', 'm') /* MAD p-frame */ |
| 46 | #define MADe_TAG MKTAG('M', 'A', 'D', 'e') /* MAD lqp-frame */ |
| 47 | |
| 48 | typedef struct MadContext { |
| 49 | AVCodecContext *avctx; |
| 50 | BlockDSPContext bdsp; |
| 51 | BswapDSPContext bbdsp; |
| 52 | IDCTDSPContext idsp; |
| 53 | AVFrame *last_frame; |
| 54 | GetBitContext gb; |
| 55 | void *bitstream_buf; |
| 56 | unsigned int bitstream_buf_size; |
| 57 | DECLARE_ALIGNED(16, int16_t, block)[64]; |
| 58 | ScanTable scantable; |
| 59 | uint16_t quant_matrix[64]; |
| 60 | int mb_x; |
| 61 | int mb_y; |
| 62 | } MadContext; |
| 63 | |
| 64 | static av_cold int decode_init(AVCodecContext *avctx) |
| 65 | { |
| 66 | MadContext *s = avctx->priv_data; |
| 67 | s->avctx = avctx; |
| 68 | avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
| 69 | ff_blockdsp_init(&s->bdsp, avctx); |
| 70 | ff_bswapdsp_init(&s->bbdsp); |
| 71 | ff_idctdsp_init(&s->idsp, avctx); |
| 72 | ff_init_scantable_permutation(s->idsp.idct_permutation, FF_IDCT_PERM_NONE); |
| 73 | ff_init_scantable(s->idsp.idct_permutation, &s->scantable, ff_zigzag_direct); |
| 74 | ff_mpeg12_init_vlcs(); |
| 75 | |
| 76 | s->last_frame = av_frame_alloc(); |
| 77 | if (!s->last_frame) |
| 78 | return AVERROR(ENOMEM); |
| 79 | |
| 80 | return 0; |
| 81 | } |
| 82 | |
| 83 | static inline void comp(unsigned char *dst, int dst_stride, |
| 84 | unsigned char *src, int src_stride, int add) |
| 85 | { |
| 86 | int j, i; |
| 87 | for (j=0; j<8; j++) |
| 88 | for (i=0; i<8; i++) |
| 89 | dst[j*dst_stride + i] = av_clip_uint8(src[j*src_stride + i] + add); |
| 90 | } |
| 91 | |
| 92 | static inline void comp_block(MadContext *t, AVFrame *frame, |
| 93 | int mb_x, int mb_y, |
| 94 | int j, int mv_x, int mv_y, int add) |
| 95 | { |
| 96 | if (j < 4) { |
| 97 | unsigned offset = (mb_y*16 + ((j&2)<<2) + mv_y)*t->last_frame->linesize[0] + mb_x*16 + ((j&1)<<3) + mv_x; |
| 98 | if (offset >= (t->avctx->height - 7) * t->last_frame->linesize[0] - 7) |
| 99 | return; |
| 100 | comp(frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3), |
| 101 | frame->linesize[0], |
| 102 | t->last_frame->data[0] + offset, |
| 103 | t->last_frame->linesize[0], add); |
| 104 | } else if (!(t->avctx->flags & CODEC_FLAG_GRAY)) { |
| 105 | int index = j - 3; |
| 106 | unsigned offset = (mb_y * 8 + (mv_y/2))*t->last_frame->linesize[index] + mb_x * 8 + (mv_x/2); |
| 107 | if (offset >= (t->avctx->height/2 - 7) * t->last_frame->linesize[index] - 7) |
| 108 | return; |
| 109 | comp(frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x * 8, |
| 110 | frame->linesize[index], |
| 111 | t->last_frame->data[index] + offset, |
| 112 | t->last_frame->linesize[index], add); |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | static inline void idct_put(MadContext *t, AVFrame *frame, int16_t *block, |
| 117 | int mb_x, int mb_y, int j) |
| 118 | { |
| 119 | if (j < 4) { |
| 120 | ff_ea_idct_put_c( |
| 121 | frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3), |
| 122 | frame->linesize[0], block); |
| 123 | } else if (!(t->avctx->flags & CODEC_FLAG_GRAY)) { |
| 124 | int index = j - 3; |
| 125 | ff_ea_idct_put_c( |
| 126 | frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x*8, |
| 127 | frame->linesize[index], block); |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | static inline int decode_block_intra(MadContext *s, int16_t * block) |
| 132 | { |
| 133 | int level, i, j, run; |
| 134 | RLTable *rl = &ff_rl_mpeg1; |
| 135 | const uint8_t *scantable = s->scantable.permutated; |
| 136 | int16_t *quant_matrix = s->quant_matrix; |
| 137 | |
| 138 | block[0] = (128 + get_sbits(&s->gb, 8)) * quant_matrix[0]; |
| 139 | |
| 140 | /* The RL decoder is derived from mpeg1_decode_block_intra; |
| 141 | Escaped level and run values a decoded differently */ |
| 142 | i = 0; |
| 143 | { |
| 144 | OPEN_READER(re, &s->gb); |
| 145 | /* now quantify & encode AC coefficients */ |
| 146 | for (;;) { |
| 147 | UPDATE_CACHE(re, &s->gb); |
| 148 | GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); |
| 149 | |
| 150 | if (level == 127) { |
| 151 | break; |
| 152 | } else if (level != 0) { |
| 153 | i += run; |
| 154 | j = scantable[i]; |
| 155 | level = (level*quant_matrix[j]) >> 4; |
| 156 | level = (level-1)|1; |
| 157 | level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); |
| 158 | LAST_SKIP_BITS(re, &s->gb, 1); |
| 159 | } else { |
| 160 | /* escape */ |
| 161 | UPDATE_CACHE(re, &s->gb); |
| 162 | level = SHOW_SBITS(re, &s->gb, 10); SKIP_BITS(re, &s->gb, 10); |
| 163 | |
| 164 | UPDATE_CACHE(re, &s->gb); |
| 165 | run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6); |
| 166 | |
| 167 | i += run; |
| 168 | j = scantable[i]; |
| 169 | if (level < 0) { |
| 170 | level = -level; |
| 171 | level = (level*quant_matrix[j]) >> 4; |
| 172 | level = (level-1)|1; |
| 173 | level = -level; |
| 174 | } else { |
| 175 | level = (level*quant_matrix[j]) >> 4; |
| 176 | level = (level-1)|1; |
| 177 | } |
| 178 | } |
| 179 | if (i > 63) { |
| 180 | av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y); |
| 181 | return -1; |
| 182 | } |
| 183 | |
| 184 | block[j] = level; |
| 185 | } |
| 186 | CLOSE_READER(re, &s->gb); |
| 187 | } |
| 188 | return 0; |
| 189 | } |
| 190 | |
| 191 | static int decode_motion(GetBitContext *gb) |
| 192 | { |
| 193 | int value = 0; |
| 194 | if (get_bits1(gb)) { |
| 195 | if (get_bits1(gb)) |
| 196 | value = -17; |
| 197 | value += get_bits(gb, 4) + 1; |
| 198 | } |
| 199 | return value; |
| 200 | } |
| 201 | |
| 202 | static int decode_mb(MadContext *s, AVFrame *frame, int inter) |
| 203 | { |
| 204 | int mv_map = 0; |
| 205 | int av_uninit(mv_x), av_uninit(mv_y); |
| 206 | int j; |
| 207 | |
| 208 | if (inter) { |
| 209 | int v = decode210(&s->gb); |
| 210 | if (v < 2) { |
| 211 | mv_map = v ? get_bits(&s->gb, 6) : 63; |
| 212 | mv_x = decode_motion(&s->gb); |
| 213 | mv_y = decode_motion(&s->gb); |
| 214 | } |
| 215 | } |
| 216 | |
| 217 | for (j=0; j<6; j++) { |
| 218 | if (mv_map & (1<<j)) { // mv_x and mv_y are guarded by mv_map |
| 219 | int add = 2*decode_motion(&s->gb); |
| 220 | if (s->last_frame->data[0]) |
| 221 | comp_block(s, frame, s->mb_x, s->mb_y, j, mv_x, mv_y, add); |
| 222 | } else { |
| 223 | s->bdsp.clear_block(s->block); |
| 224 | if(decode_block_intra(s, s->block) < 0) |
| 225 | return -1; |
| 226 | idct_put(s, frame, s->block, s->mb_x, s->mb_y, j); |
| 227 | } |
| 228 | } |
| 229 | return 0; |
| 230 | } |
| 231 | |
| 232 | static void calc_quant_matrix(MadContext *s, int qscale) |
| 233 | { |
| 234 | int i; |
| 235 | |
| 236 | s->quant_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0]) >> 11; |
| 237 | for (i=1; i<64; i++) |
| 238 | s->quant_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32) >> 10; |
| 239 | } |
| 240 | |
| 241 | static int decode_frame(AVCodecContext *avctx, |
| 242 | void *data, int *got_frame, |
| 243 | AVPacket *avpkt) |
| 244 | { |
| 245 | const uint8_t *buf = avpkt->data; |
| 246 | int buf_size = avpkt->size; |
| 247 | MadContext *s = avctx->priv_data; |
| 248 | AVFrame *frame = data; |
| 249 | GetByteContext gb; |
| 250 | int width, height; |
| 251 | int chunk_type; |
| 252 | int inter, ret; |
| 253 | |
| 254 | bytestream2_init(&gb, buf, buf_size); |
| 255 | |
| 256 | chunk_type = bytestream2_get_le32(&gb); |
| 257 | inter = (chunk_type == MADm_TAG || chunk_type == MADe_TAG); |
| 258 | bytestream2_skip(&gb, 10); |
| 259 | |
| 260 | av_reduce(&avctx->time_base.num, &avctx->time_base.den, |
| 261 | bytestream2_get_le16(&gb), 1000, 1<<30); |
| 262 | |
| 263 | width = bytestream2_get_le16(&gb); |
| 264 | height = bytestream2_get_le16(&gb); |
| 265 | bytestream2_skip(&gb, 1); |
| 266 | calc_quant_matrix(s, bytestream2_get_byte(&gb)); |
| 267 | bytestream2_skip(&gb, 2); |
| 268 | |
| 269 | if (bytestream2_get_bytes_left(&gb) < 2) { |
| 270 | av_log(avctx, AV_LOG_ERROR, "Input data too small\n"); |
| 271 | return AVERROR_INVALIDDATA; |
| 272 | } |
| 273 | |
| 274 | if (width < 16 || height < 16) { |
| 275 | av_log(avctx, AV_LOG_ERROR, "Dimensions too small\n"); |
| 276 | return AVERROR_INVALIDDATA; |
| 277 | } |
| 278 | |
| 279 | if (avctx->width != width || avctx->height != height) { |
| 280 | av_frame_unref(s->last_frame); |
| 281 | if((width * height)/2048*7 > bytestream2_get_bytes_left(&gb)) |
| 282 | return AVERROR_INVALIDDATA; |
| 283 | if ((ret = ff_set_dimensions(avctx, width, height)) < 0) |
| 284 | return ret; |
| 285 | } |
| 286 | |
| 287 | if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) |
| 288 | return ret; |
| 289 | |
| 290 | if (inter && !s->last_frame->data[0]) { |
| 291 | av_log(avctx, AV_LOG_WARNING, "Missing reference frame.\n"); |
| 292 | ret = ff_get_buffer(avctx, s->last_frame, AV_GET_BUFFER_FLAG_REF); |
| 293 | if (ret < 0) |
| 294 | return ret; |
| 295 | memset(s->last_frame->data[0], 0, s->last_frame->height * |
| 296 | s->last_frame->linesize[0]); |
| 297 | memset(s->last_frame->data[1], 0x80, s->last_frame->height / 2 * |
| 298 | s->last_frame->linesize[1]); |
| 299 | memset(s->last_frame->data[2], 0x80, s->last_frame->height / 2 * |
| 300 | s->last_frame->linesize[2]); |
| 301 | } |
| 302 | |
| 303 | av_fast_padded_malloc(&s->bitstream_buf, &s->bitstream_buf_size, |
| 304 | bytestream2_get_bytes_left(&gb)); |
| 305 | if (!s->bitstream_buf) |
| 306 | return AVERROR(ENOMEM); |
| 307 | s->bbdsp.bswap16_buf(s->bitstream_buf, (const uint16_t *)(buf + bytestream2_tell(&gb)), |
| 308 | bytestream2_get_bytes_left(&gb) / 2); |
| 309 | memset((uint8_t*)s->bitstream_buf + bytestream2_get_bytes_left(&gb), 0, FF_INPUT_BUFFER_PADDING_SIZE); |
| 310 | init_get_bits(&s->gb, s->bitstream_buf, 8*(bytestream2_get_bytes_left(&gb))); |
| 311 | |
| 312 | for (s->mb_y=0; s->mb_y < (avctx->height+15)/16; s->mb_y++) |
| 313 | for (s->mb_x=0; s->mb_x < (avctx->width +15)/16; s->mb_x++) |
| 314 | if(decode_mb(s, frame, inter) < 0) |
| 315 | return AVERROR_INVALIDDATA; |
| 316 | |
| 317 | *got_frame = 1; |
| 318 | |
| 319 | if (chunk_type != MADe_TAG) { |
| 320 | av_frame_unref(s->last_frame); |
| 321 | if ((ret = av_frame_ref(s->last_frame, frame)) < 0) |
| 322 | return ret; |
| 323 | } |
| 324 | |
| 325 | return buf_size; |
| 326 | } |
| 327 | |
| 328 | static av_cold int decode_end(AVCodecContext *avctx) |
| 329 | { |
| 330 | MadContext *t = avctx->priv_data; |
| 331 | av_frame_free(&t->last_frame); |
| 332 | av_free(t->bitstream_buf); |
| 333 | return 0; |
| 334 | } |
| 335 | |
| 336 | AVCodec ff_eamad_decoder = { |
| 337 | .name = "eamad", |
| 338 | .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts Madcow Video"), |
| 339 | .type = AVMEDIA_TYPE_VIDEO, |
| 340 | .id = AV_CODEC_ID_MAD, |
| 341 | .priv_data_size = sizeof(MadContext), |
| 342 | .init = decode_init, |
| 343 | .close = decode_end, |
| 344 | .decode = decode_frame, |
| 345 | .capabilities = CODEC_CAP_DR1, |
| 346 | }; |