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2ba45a60 DM |
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 | ||
f6fa7814 | 260 | av_reduce(&avctx->framerate.den, &avctx->framerate.num, |
2ba45a60 DM |
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); | |
f6fa7814 | 332 | av_freep(&t->bitstream_buf); |
2ba45a60 DM |
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 | }; |