Line | Branch | Exec | Source |
---|---|---|---|
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 "libavutil/mem.h" | ||
32 | #include "libavutil/mem_internal.h" | ||
33 | |||
34 | #include "avcodec.h" | ||
35 | #include "blockdsp.h" | ||
36 | #include "bytestream.h" | ||
37 | #include "bswapdsp.h" | ||
38 | #include "codec_internal.h" | ||
39 | #include "decode.h" | ||
40 | #include "get_bits.h" | ||
41 | #include "aandcttab.h" | ||
42 | #include "eaidct.h" | ||
43 | #include "mpeg12data.h" | ||
44 | #include "mpeg12vlc.h" | ||
45 | |||
46 | #define EA_PREAMBLE_SIZE 8 | ||
47 | #define MADk_TAG MKTAG('M', 'A', 'D', 'k') /* MAD I-frame */ | ||
48 | #define MADm_TAG MKTAG('M', 'A', 'D', 'm') /* MAD P-frame */ | ||
49 | #define MADe_TAG MKTAG('M', 'A', 'D', 'e') /* MAD lqp-frame */ | ||
50 | |||
51 | typedef struct MadContext { | ||
52 | AVCodecContext *avctx; | ||
53 | BlockDSPContext bdsp; | ||
54 | BswapDSPContext bbdsp; | ||
55 | AVFrame *last_frame; | ||
56 | GetBitContext gb; | ||
57 | void *bitstream_buf; | ||
58 | unsigned int bitstream_buf_size; | ||
59 | DECLARE_ALIGNED(32, int16_t, block)[64]; | ||
60 | uint16_t quant_matrix[64]; | ||
61 | } MadContext; | ||
62 | |||
63 | 4 | static av_cold int decode_init(AVCodecContext *avctx) | |
64 | { | ||
65 | 4 | MadContext *s = avctx->priv_data; | |
66 | 4 | s->avctx = avctx; | |
67 | 4 | avctx->pix_fmt = AV_PIX_FMT_YUV420P; | |
68 | 4 | ff_blockdsp_init(&s->bdsp); | |
69 | 4 | ff_bswapdsp_init(&s->bbdsp); | |
70 | 4 | ff_mpeg12_init_vlcs(); | |
71 | |||
72 | 4 | s->last_frame = av_frame_alloc(); | |
73 |
1/2✗ Branch 0 not taken.
✓ Branch 1 taken 4 times.
|
4 | if (!s->last_frame) |
74 | ✗ | return AVERROR(ENOMEM); | |
75 | |||
76 | 4 | return 0; | |
77 | } | ||
78 | |||
79 | 665174 | static inline void comp(unsigned char *dst, ptrdiff_t dst_stride, | |
80 | unsigned char *src, ptrdiff_t src_stride, int add) | ||
81 | { | ||
82 | int j, i; | ||
83 |
2/2✓ Branch 0 taken 5321392 times.
✓ Branch 1 taken 665174 times.
|
5986566 | for (j=0; j<8; j++) |
84 |
2/2✓ Branch 0 taken 42571136 times.
✓ Branch 1 taken 5321392 times.
|
47892528 | for (i=0; i<8; i++) |
85 | 42571136 | dst[j*dst_stride + i] = av_clip_uint8(src[j*src_stride + i] + add); | |
86 | 665174 | } | |
87 | |||
88 | 665174 | static inline void comp_block(MadContext *t, AVFrame *frame, | |
89 | int mb_x, int mb_y, | ||
90 | int j, int mv_x, int mv_y, int add) | ||
91 | { | ||
92 |
2/2✓ Branch 0 taken 437978 times.
✓ Branch 1 taken 227196 times.
|
665174 | if (j < 4) { |
93 | 437978 | unsigned offset = (mb_y*16 + ((j&2)<<2) + mv_y)*t->last_frame->linesize[0] + mb_x*16 + ((j&1)<<3) + mv_x; | |
94 |
1/2✗ Branch 0 not taken.
✓ Branch 1 taken 437978 times.
|
437978 | if (offset >= (t->avctx->height - 7) * t->last_frame->linesize[0] - 7) |
95 | ✗ | return; | |
96 | 437978 | comp(frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3), | |
97 | 437978 | frame->linesize[0], | |
98 | 437978 | t->last_frame->data[0] + offset, | |
99 | 437978 | t->last_frame->linesize[0], add); | |
100 |
1/2✓ Branch 0 taken 227196 times.
✗ Branch 1 not taken.
|
227196 | } else if (!(t->avctx->flags & AV_CODEC_FLAG_GRAY)) { |
101 | 227196 | int index = j - 3; | |
102 | 227196 | unsigned offset = (mb_y * 8 + (mv_y/2))*t->last_frame->linesize[index] + mb_x * 8 + (mv_x/2); | |
103 |
1/2✗ Branch 0 not taken.
✓ Branch 1 taken 227196 times.
|
227196 | if (offset >= (t->avctx->height/2 - 7) * t->last_frame->linesize[index] - 7) |
104 | ✗ | return; | |
105 | 227196 | comp(frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x * 8, | |
106 | 227196 | frame->linesize[index], | |
107 | 227196 | t->last_frame->data[index] + offset, | |
108 | 227196 | t->last_frame->linesize[index], add); | |
109 | } | ||
110 | } | ||
111 | |||
112 | 158158 | static inline void idct_put(MadContext *t, AVFrame *frame, int16_t *block, | |
113 | int mb_x, int mb_y, int j) | ||
114 | { | ||
115 |
2/2✓ Branch 0 taken 110910 times.
✓ Branch 1 taken 47248 times.
|
158158 | if (j < 4) { |
116 | 110910 | ff_ea_idct_put_c( | |
117 | 110910 | frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3), | |
118 | 110910 | frame->linesize[0], block); | |
119 |
1/2✓ Branch 0 taken 47248 times.
✗ Branch 1 not taken.
|
47248 | } else if (!(t->avctx->flags & AV_CODEC_FLAG_GRAY)) { |
120 | 47248 | int index = j - 3; | |
121 | 47248 | ff_ea_idct_put_c( | |
122 | 47248 | frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x*8, | |
123 | 47248 | frame->linesize[index], block); | |
124 | } | ||
125 | 158158 | } | |
126 | |||
127 | 158158 | static inline int decode_block_intra(MadContext *s, int16_t * block) | |
128 | { | ||
129 | int level, i, j, run; | ||
130 | 158158 | const uint8_t *scantable = ff_zigzag_direct; | |
131 | 158158 | int16_t *quant_matrix = s->quant_matrix; | |
132 | |||
133 | 158158 | block[0] = (128 + get_sbits(&s->gb, 8)) * quant_matrix[0]; | |
134 | |||
135 | /* The RL decoder is derived from mpeg1_decode_block_intra; | ||
136 | Escaped level and run values a decoded differently */ | ||
137 | 158158 | i = 0; | |
138 | { | ||
139 | 158158 | OPEN_READER(re, &s->gb); | |
140 | /* now quantify & encode AC coefficients */ | ||
141 | for (;;) { | ||
142 | 2066278 | UPDATE_CACHE(re, &s->gb); | |
143 |
2/2✓ Branch 1 taken 177391 times.
✓ Branch 2 taken 934827 times.
|
1112218 | GET_RL_VLC(level, run, re, &s->gb, ff_mpeg1_rl_vlc, TEX_VLC_BITS, 2, 0); |
144 | |||
145 |
2/2✓ Branch 0 taken 158158 times.
✓ Branch 1 taken 954060 times.
|
1112218 | if (level == 127) { |
146 | 158158 | break; | |
147 |
2/2✓ Branch 0 taken 913987 times.
✓ Branch 1 taken 40073 times.
|
954060 | } else if (level != 0) { |
148 | 913987 | i += run; | |
149 |
1/2✗ Branch 0 not taken.
✓ Branch 1 taken 913987 times.
|
913987 | if (i > 63) |
150 | ✗ | return -1; | |
151 | 913987 | j = scantable[i]; | |
152 | 913987 | level = (level*quant_matrix[j]) >> 4; | |
153 | 913987 | level = (level-1)|1; | |
154 | 913987 | level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); | |
155 | 913987 | LAST_SKIP_BITS(re, &s->gb, 1); | |
156 | } else { | ||
157 | /* escape */ | ||
158 | 40073 | level = SHOW_SBITS(re, &s->gb, 10); SKIP_BITS(re, &s->gb, 10); | |
159 | |||
160 | 40073 | run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6); | |
161 | |||
162 | 40073 | i += run; | |
163 |
1/2✗ Branch 0 not taken.
✓ Branch 1 taken 40073 times.
|
40073 | if (i > 63) |
164 | ✗ | return -1; | |
165 | 40073 | j = scantable[i]; | |
166 |
2/2✓ Branch 0 taken 20920 times.
✓ Branch 1 taken 19153 times.
|
40073 | if (level < 0) { |
167 | 20920 | level = -level; | |
168 | 20920 | level = (level*quant_matrix[j]) >> 4; | |
169 | 20920 | level = (level-1)|1; | |
170 | 20920 | level = -level; | |
171 | } else { | ||
172 | 19153 | level = (level*quant_matrix[j]) >> 4; | |
173 | 19153 | level = (level-1)|1; | |
174 | } | ||
175 | } | ||
176 | |||
177 | 954060 | block[j] = level; | |
178 | } | ||
179 | 158158 | CLOSE_READER(re, &s->gb); | |
180 | } | ||
181 | 158158 | return 0; | |
182 | } | ||
183 | |||
184 | 897656 | static int decode_motion(GetBitContext *gb) | |
185 | { | ||
186 | 897656 | int value = 0; | |
187 |
2/2✓ Branch 1 taken 300433 times.
✓ Branch 2 taken 597223 times.
|
897656 | if (get_bits1(gb)) { |
188 |
2/2✓ Branch 1 taken 163614 times.
✓ Branch 2 taken 136819 times.
|
300433 | if (get_bits1(gb)) |
189 | 163614 | value = -17; | |
190 | 300433 | value += get_bits(gb, 4) + 1; | |
191 | } | ||
192 | 897656 | return value; | |
193 | } | ||
194 | |||
195 | 137222 | static int decode_mb(MadContext *s, AVFrame *frame, int inter, int mb_x, int mb_y) | |
196 | { | ||
197 | 137222 | int mv_map = 0; | |
198 | 137222 | int av_uninit(mv_x), av_uninit(mv_y); | |
199 | int j; | ||
200 | |||
201 |
2/2✓ Branch 0 taken 119970 times.
✓ Branch 1 taken 17252 times.
|
137222 | if (inter) { |
202 | 119970 | int v = decode210(&s->gb); | |
203 |
2/2✓ Branch 0 taken 116241 times.
✓ Branch 1 taken 3729 times.
|
119970 | if (v < 2) { |
204 |
2/2✓ Branch 0 taken 11609 times.
✓ Branch 1 taken 104632 times.
|
116241 | mv_map = v ? get_bits(&s->gb, 6) : 63; |
205 | 116241 | mv_x = decode_motion(&s->gb); | |
206 | 116241 | mv_y = decode_motion(&s->gb); | |
207 | } | ||
208 | } | ||
209 | |||
210 |
2/2✓ Branch 0 taken 823332 times.
✓ Branch 1 taken 137222 times.
|
960554 | for (j=0; j<6; j++) { |
211 |
2/2✓ Branch 0 taken 665174 times.
✓ Branch 1 taken 158158 times.
|
823332 | if (mv_map & (1<<j)) { // mv_x and mv_y are guarded by mv_map |
212 | 665174 | int add = 2*decode_motion(&s->gb); | |
213 |
1/2✓ Branch 0 taken 665174 times.
✗ Branch 1 not taken.
|
665174 | if (s->last_frame->data[0]) |
214 | 665174 | comp_block(s, frame, mb_x, mb_y, j, mv_x, mv_y, add); | |
215 | } else { | ||
216 | 158158 | s->bdsp.clear_block(s->block); | |
217 |
1/2✗ Branch 1 not taken.
✓ Branch 2 taken 158158 times.
|
158158 | if (decode_block_intra(s, s->block) < 0) { |
218 | ✗ | av_log(s->avctx, AV_LOG_ERROR, | |
219 | "ac-tex damaged at %d %d\n", mb_x, mb_y); | ||
220 | ✗ | return -1; | |
221 | } | ||
222 | 158158 | idct_put(s, frame, s->block, mb_x, mb_y, j); | |
223 | } | ||
224 | } | ||
225 | 137222 | return 0; | |
226 | } | ||
227 | |||
228 | 99 | static void calc_quant_matrix(MadContext *s, int qscale) | |
229 | { | ||
230 | int i; | ||
231 | |||
232 | 99 | s->quant_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0]) >> 11; | |
233 |
2/2✓ Branch 0 taken 6237 times.
✓ Branch 1 taken 99 times.
|
6336 | for (i=1; i<64; i++) |
234 | 6237 | s->quant_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32) >> 10; | |
235 | 99 | } | |
236 | |||
237 | 99 | static int decode_frame(AVCodecContext *avctx, AVFrame *frame, | |
238 | int *got_frame, AVPacket *avpkt) | ||
239 | { | ||
240 | 99 | const uint8_t *buf = avpkt->data; | |
241 | 99 | int buf_size = avpkt->size; | |
242 | 99 | MadContext *s = avctx->priv_data; | |
243 | GetByteContext gb; | ||
244 | int width, height; | ||
245 | int chunk_type; | ||
246 | int inter, ret; | ||
247 | |||
248 | 99 | bytestream2_init(&gb, buf, buf_size); | |
249 | |||
250 | 99 | chunk_type = bytestream2_get_le32(&gb); | |
251 |
4/4✓ Branch 0 taken 61 times.
✓ Branch 1 taken 38 times.
✓ Branch 2 taken 48 times.
✓ Branch 3 taken 13 times.
|
99 | inter = (chunk_type == MADm_TAG || chunk_type == MADe_TAG); |
252 | 99 | bytestream2_skip(&gb, 10); | |
253 | |||
254 | 99 | av_reduce(&avctx->framerate.den, &avctx->framerate.num, | |
255 | 99 | bytestream2_get_le16(&gb), 1000, 1<<30); | |
256 | |||
257 | 99 | width = bytestream2_get_le16(&gb); | |
258 | 99 | height = bytestream2_get_le16(&gb); | |
259 | 99 | bytestream2_skip(&gb, 1); | |
260 | 99 | calc_quant_matrix(s, bytestream2_get_byte(&gb)); | |
261 | 99 | bytestream2_skip(&gb, 2); | |
262 | |||
263 |
1/2✗ Branch 1 not taken.
✓ Branch 2 taken 99 times.
|
99 | if (bytestream2_get_bytes_left(&gb) < 2) { |
264 | ✗ | av_log(avctx, AV_LOG_ERROR, "Input data too small\n"); | |
265 | ✗ | return AVERROR_INVALIDDATA; | |
266 | } | ||
267 | |||
268 |
2/4✓ Branch 0 taken 99 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✓ Branch 3 taken 99 times.
|
99 | if (width < 16 || height < 16) { |
269 | ✗ | av_log(avctx, AV_LOG_ERROR, "Dimensions too small\n"); | |
270 | ✗ | return AVERROR_INVALIDDATA; | |
271 | } | ||
272 | |||
273 |
3/4✓ Branch 0 taken 96 times.
✓ Branch 1 taken 3 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 96 times.
|
99 | if (avctx->width != width || avctx->height != height) { |
274 | 3 | av_frame_unref(s->last_frame); | |
275 |
1/2✗ Branch 1 not taken.
✓ Branch 2 taken 3 times.
|
3 | if((width * (int64_t)height)/2048*7 > bytestream2_get_bytes_left(&gb)) |
276 | ✗ | return AVERROR_INVALIDDATA; | |
277 |
1/2✗ Branch 1 not taken.
✓ Branch 2 taken 3 times.
|
3 | if ((ret = ff_set_dimensions(avctx, width, height)) < 0) |
278 | ✗ | return ret; | |
279 | } | ||
280 | |||
281 |
1/2✗ Branch 1 not taken.
✓ Branch 2 taken 99 times.
|
99 | if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) |
282 | ✗ | return ret; | |
283 | |||
284 |
3/4✓ Branch 0 taken 86 times.
✓ Branch 1 taken 13 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 86 times.
|
99 | if (inter && !s->last_frame->data[0]) { |
285 | ✗ | av_log(avctx, AV_LOG_WARNING, "Missing reference frame.\n"); | |
286 | ✗ | ret = ff_get_buffer(avctx, s->last_frame, AV_GET_BUFFER_FLAG_REF); | |
287 | ✗ | if (ret < 0) | |
288 | ✗ | return ret; | |
289 | ✗ | memset(s->last_frame->data[0], 0, s->last_frame->height * | |
290 | ✗ | s->last_frame->linesize[0]); | |
291 | ✗ | memset(s->last_frame->data[1], 0x80, s->last_frame->height / 2 * | |
292 | ✗ | s->last_frame->linesize[1]); | |
293 | ✗ | memset(s->last_frame->data[2], 0x80, s->last_frame->height / 2 * | |
294 | ✗ | s->last_frame->linesize[2]); | |
295 | } | ||
296 | |||
297 | 99 | av_fast_padded_malloc(&s->bitstream_buf, &s->bitstream_buf_size, | |
298 | 99 | bytestream2_get_bytes_left(&gb)); | |
299 |
1/2✗ Branch 0 not taken.
✓ Branch 1 taken 99 times.
|
99 | if (!s->bitstream_buf) |
300 | ✗ | return AVERROR(ENOMEM); | |
301 | 99 | s->bbdsp.bswap16_buf(s->bitstream_buf, (const uint16_t *)(buf + bytestream2_tell(&gb)), | |
302 | 99 | bytestream2_get_bytes_left(&gb) / 2); | |
303 | 99 | memset((uint8_t*)s->bitstream_buf + bytestream2_get_bytes_left(&gb), 0, AV_INPUT_BUFFER_PADDING_SIZE); | |
304 | 99 | init_get_bits(&s->gb, s->bitstream_buf, 8*(bytestream2_get_bytes_left(&gb))); | |
305 | |||
306 |
2/2✓ Branch 0 taken 3054 times.
✓ Branch 1 taken 99 times.
|
3153 | for (int mb_y = 0; mb_y < (avctx->height + 15) / 16; mb_y++) |
307 |
2/2✓ Branch 0 taken 137222 times.
✓ Branch 1 taken 3054 times.
|
140276 | for (int mb_x = 0; mb_x < (avctx->width + 15) / 16; mb_x++) |
308 |
1/2✗ Branch 1 not taken.
✓ Branch 2 taken 137222 times.
|
137222 | if (decode_mb(s, frame, inter, mb_x, mb_y) < 0) |
309 | ✗ | return AVERROR_INVALIDDATA; | |
310 | |||
311 | 99 | *got_frame = 1; | |
312 | |||
313 |
2/2✓ Branch 0 taken 51 times.
✓ Branch 1 taken 48 times.
|
99 | if (chunk_type != MADe_TAG) { |
314 |
1/2✗ Branch 1 not taken.
✓ Branch 2 taken 51 times.
|
51 | if ((ret = av_frame_replace(s->last_frame, frame)) < 0) |
315 | ✗ | return ret; | |
316 | } | ||
317 | |||
318 | 99 | return buf_size; | |
319 | } | ||
320 | |||
321 | 4 | static av_cold int decode_end(AVCodecContext *avctx) | |
322 | { | ||
323 | 4 | MadContext *t = avctx->priv_data; | |
324 | 4 | av_frame_free(&t->last_frame); | |
325 | 4 | av_freep(&t->bitstream_buf); | |
326 | 4 | return 0; | |
327 | } | ||
328 | |||
329 | const FFCodec ff_eamad_decoder = { | ||
330 | .p.name = "eamad", | ||
331 | CODEC_LONG_NAME("Electronic Arts Madcow Video"), | ||
332 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
333 | .p.id = AV_CODEC_ID_MAD, | ||
334 | .priv_data_size = sizeof(MadContext), | ||
335 | .init = decode_init, | ||
336 | .close = decode_end, | ||
337 | FF_CODEC_DECODE_CB(decode_frame), | ||
338 | .p.capabilities = AV_CODEC_CAP_DR1, | ||
339 | }; | ||
340 |