Directory: | ../../../ffmpeg/ |
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File: | src/libavcodec/eamad.c |
Date: | 2022-07-04 00:18:54 |
Exec | Total | Coverage | |
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Lines: | 154 | 182 | 84.6% |
Branches: | 66 | 88 | 75.0% |
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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_internal.h" | ||
32 | |||
33 | #include "avcodec.h" | ||
34 | #include "blockdsp.h" | ||
35 | #include "bytestream.h" | ||
36 | #include "bswapdsp.h" | ||
37 | #include "codec_internal.h" | ||
38 | #include "get_bits.h" | ||
39 | #include "aandcttab.h" | ||
40 | #include "eaidct.h" | ||
41 | #include "idctdsp.h" | ||
42 | #include "internal.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 | IDCTDSPContext idsp; | ||
56 | AVFrame *last_frame; | ||
57 | GetBitContext gb; | ||
58 | void *bitstream_buf; | ||
59 | unsigned int bitstream_buf_size; | ||
60 | DECLARE_ALIGNED(32, int16_t, block)[64]; | ||
61 | ScanTable scantable; | ||
62 | uint16_t quant_matrix[64]; | ||
63 | int mb_x; | ||
64 | int mb_y; | ||
65 | } MadContext; | ||
66 | |||
67 | 4 | static av_cold int decode_init(AVCodecContext *avctx) | |
68 | { | ||
69 | 4 | MadContext *s = avctx->priv_data; | |
70 | 4 | s->avctx = avctx; | |
71 | 4 | avctx->pix_fmt = AV_PIX_FMT_YUV420P; | |
72 | 4 | ff_blockdsp_init(&s->bdsp, avctx); | |
73 | 4 | ff_bswapdsp_init(&s->bbdsp); | |
74 | 4 | ff_idctdsp_init(&s->idsp, avctx); | |
75 | 4 | ff_init_scantable_permutation(s->idsp.idct_permutation, FF_IDCT_PERM_NONE); | |
76 | 4 | ff_init_scantable(s->idsp.idct_permutation, &s->scantable, ff_zigzag_direct); | |
77 | 4 | ff_mpeg12_init_vlcs(); | |
78 | |||
79 | 4 | s->last_frame = av_frame_alloc(); | |
80 |
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4 | if (!s->last_frame) |
81 | ✗ | return AVERROR(ENOMEM); | |
82 | |||
83 | 4 | return 0; | |
84 | } | ||
85 | |||
86 | 665174 | static inline void comp(unsigned char *dst, ptrdiff_t dst_stride, | |
87 | unsigned char *src, ptrdiff_t src_stride, int add) | ||
88 | { | ||
89 | int j, i; | ||
90 |
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5986566 | for (j=0; j<8; j++) |
91 |
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47892528 | for (i=0; i<8; i++) |
92 | 42571136 | dst[j*dst_stride + i] = av_clip_uint8(src[j*src_stride + i] + add); | |
93 | 665174 | } | |
94 | |||
95 | 665174 | static inline void comp_block(MadContext *t, AVFrame *frame, | |
96 | int mb_x, int mb_y, | ||
97 | int j, int mv_x, int mv_y, int add) | ||
98 | { | ||
99 |
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665174 | if (j < 4) { |
100 | 437978 | unsigned offset = (mb_y*16 + ((j&2)<<2) + mv_y)*t->last_frame->linesize[0] + mb_x*16 + ((j&1)<<3) + mv_x; | |
101 |
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437978 | if (offset >= (t->avctx->height - 7) * t->last_frame->linesize[0] - 7) |
102 | ✗ | return; | |
103 | 437978 | comp(frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3), | |
104 | 437978 | frame->linesize[0], | |
105 | 437978 | t->last_frame->data[0] + offset, | |
106 | 437978 | t->last_frame->linesize[0], add); | |
107 |
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227196 | } else if (!(t->avctx->flags & AV_CODEC_FLAG_GRAY)) { |
108 | 227196 | int index = j - 3; | |
109 | 227196 | unsigned offset = (mb_y * 8 + (mv_y/2))*t->last_frame->linesize[index] + mb_x * 8 + (mv_x/2); | |
110 |
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227196 | if (offset >= (t->avctx->height/2 - 7) * t->last_frame->linesize[index] - 7) |
111 | ✗ | return; | |
112 | 227196 | comp(frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x * 8, | |
113 | 227196 | frame->linesize[index], | |
114 | 227196 | t->last_frame->data[index] + offset, | |
115 | 227196 | t->last_frame->linesize[index], add); | |
116 | } | ||
117 | } | ||
118 | |||
119 | 158158 | static inline void idct_put(MadContext *t, AVFrame *frame, int16_t *block, | |
120 | int mb_x, int mb_y, int j) | ||
121 | { | ||
122 |
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158158 | if (j < 4) { |
123 | 110910 | ff_ea_idct_put_c( | |
124 | 110910 | frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3), | |
125 | 110910 | frame->linesize[0], block); | |
126 |
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47248 | } else if (!(t->avctx->flags & AV_CODEC_FLAG_GRAY)) { |
127 | 47248 | int index = j - 3; | |
128 | 47248 | ff_ea_idct_put_c( | |
129 | 47248 | frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x*8, | |
130 | 47248 | frame->linesize[index], block); | |
131 | } | ||
132 | 158158 | } | |
133 | |||
134 | 158158 | static inline int decode_block_intra(MadContext *s, int16_t * block) | |
135 | { | ||
136 | int level, i, j, run; | ||
137 | 158158 | RLTable *rl = &ff_rl_mpeg1; | |
138 | 158158 | const uint8_t *scantable = s->scantable.permutated; | |
139 | 158158 | int16_t *quant_matrix = s->quant_matrix; | |
140 | |||
141 | 158158 | block[0] = (128 + get_sbits(&s->gb, 8)) * quant_matrix[0]; | |
142 | |||
143 | /* The RL decoder is derived from mpeg1_decode_block_intra; | ||
144 | Escaped level and run values a decoded differently */ | ||
145 | 158158 | i = 0; | |
146 | { | ||
147 | 158158 | OPEN_READER(re, &s->gb); | |
148 | /* now quantify & encode AC coefficients */ | ||
149 | for (;;) { | ||
150 | 1112218 | UPDATE_CACHE(re, &s->gb); | |
151 |
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1112218 | GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); |
152 | |||
153 |
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1112218 | if (level == 127) { |
154 | 158158 | break; | |
155 |
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954060 | } else if (level != 0) { |
156 | 913987 | i += run; | |
157 |
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913987 | if (i > 63) { |
158 | ✗ | av_log(s->avctx, AV_LOG_ERROR, | |
159 | "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y); | ||
160 | ✗ | return -1; | |
161 | } | ||
162 | 913987 | j = scantable[i]; | |
163 | 913987 | level = (level*quant_matrix[j]) >> 4; | |
164 | 913987 | level = (level-1)|1; | |
165 | 913987 | level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); | |
166 | 913987 | LAST_SKIP_BITS(re, &s->gb, 1); | |
167 | } else { | ||
168 | /* escape */ | ||
169 | 40073 | UPDATE_CACHE(re, &s->gb); | |
170 | 40073 | level = SHOW_SBITS(re, &s->gb, 10); SKIP_BITS(re, &s->gb, 10); | |
171 | |||
172 | 40073 | UPDATE_CACHE(re, &s->gb); | |
173 | 40073 | run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6); | |
174 | |||
175 | 40073 | i += run; | |
176 |
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40073 | if (i > 63) { |
177 | ✗ | av_log(s->avctx, AV_LOG_ERROR, | |
178 | "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y); | ||
179 | ✗ | return -1; | |
180 | } | ||
181 | 40073 | j = scantable[i]; | |
182 |
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40073 | if (level < 0) { |
183 | 20920 | level = -level; | |
184 | 20920 | level = (level*quant_matrix[j]) >> 4; | |
185 | 20920 | level = (level-1)|1; | |
186 | 20920 | level = -level; | |
187 | } else { | ||
188 | 19153 | level = (level*quant_matrix[j]) >> 4; | |
189 | 19153 | level = (level-1)|1; | |
190 | } | ||
191 | } | ||
192 | |||
193 | 954060 | block[j] = level; | |
194 | } | ||
195 | 158158 | CLOSE_READER(re, &s->gb); | |
196 | } | ||
197 | 158158 | return 0; | |
198 | } | ||
199 | |||
200 | 897656 | static int decode_motion(GetBitContext *gb) | |
201 | { | ||
202 | 897656 | int value = 0; | |
203 |
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897656 | if (get_bits1(gb)) { |
204 |
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300433 | if (get_bits1(gb)) |
205 | 163614 | value = -17; | |
206 | 300433 | value += get_bits(gb, 4) + 1; | |
207 | } | ||
208 | 897656 | return value; | |
209 | } | ||
210 | |||
211 | 137222 | static int decode_mb(MadContext *s, AVFrame *frame, int inter) | |
212 | { | ||
213 | 137222 | int mv_map = 0; | |
214 | 137222 | int av_uninit(mv_x), av_uninit(mv_y); | |
215 | int j; | ||
216 | |||
217 |
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137222 | if (inter) { |
218 | 119970 | int v = decode210(&s->gb); | |
219 |
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119970 | if (v < 2) { |
220 |
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116241 | mv_map = v ? get_bits(&s->gb, 6) : 63; |
221 | 116241 | mv_x = decode_motion(&s->gb); | |
222 | 116241 | mv_y = decode_motion(&s->gb); | |
223 | } | ||
224 | } | ||
225 | |||
226 |
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960554 | for (j=0; j<6; j++) { |
227 |
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823332 | if (mv_map & (1<<j)) { // mv_x and mv_y are guarded by mv_map |
228 | 665174 | int add = 2*decode_motion(&s->gb); | |
229 |
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665174 | if (s->last_frame->data[0]) |
230 | 665174 | comp_block(s, frame, s->mb_x, s->mb_y, j, mv_x, mv_y, add); | |
231 | } else { | ||
232 | 158158 | s->bdsp.clear_block(s->block); | |
233 |
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158158 | if(decode_block_intra(s, s->block) < 0) |
234 | ✗ | return -1; | |
235 | 158158 | idct_put(s, frame, s->block, s->mb_x, s->mb_y, j); | |
236 | } | ||
237 | } | ||
238 | 137222 | return 0; | |
239 | } | ||
240 | |||
241 | 99 | static void calc_quant_matrix(MadContext *s, int qscale) | |
242 | { | ||
243 | int i; | ||
244 | |||
245 | 99 | s->quant_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0]) >> 11; | |
246 |
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6336 | for (i=1; i<64; i++) |
247 | 6237 | s->quant_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32) >> 10; | |
248 | 99 | } | |
249 | |||
250 | 99 | static int decode_frame(AVCodecContext *avctx, AVFrame *frame, | |
251 | int *got_frame, AVPacket *avpkt) | ||
252 | { | ||
253 | 99 | const uint8_t *buf = avpkt->data; | |
254 | 99 | int buf_size = avpkt->size; | |
255 | 99 | MadContext *s = avctx->priv_data; | |
256 | GetByteContext gb; | ||
257 | int width, height; | ||
258 | int chunk_type; | ||
259 | int inter, ret; | ||
260 | |||
261 | 99 | bytestream2_init(&gb, buf, buf_size); | |
262 | |||
263 | 99 | chunk_type = bytestream2_get_le32(&gb); | |
264 |
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99 | inter = (chunk_type == MADm_TAG || chunk_type == MADe_TAG); |
265 | 99 | bytestream2_skip(&gb, 10); | |
266 | |||
267 | 99 | av_reduce(&avctx->framerate.den, &avctx->framerate.num, | |
268 | 99 | bytestream2_get_le16(&gb), 1000, 1<<30); | |
269 | |||
270 | 99 | width = bytestream2_get_le16(&gb); | |
271 | 99 | height = bytestream2_get_le16(&gb); | |
272 | 99 | bytestream2_skip(&gb, 1); | |
273 | 99 | calc_quant_matrix(s, bytestream2_get_byte(&gb)); | |
274 | 99 | bytestream2_skip(&gb, 2); | |
275 | |||
276 |
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99 | if (bytestream2_get_bytes_left(&gb) < 2) { |
277 | ✗ | av_log(avctx, AV_LOG_ERROR, "Input data too small\n"); | |
278 | ✗ | return AVERROR_INVALIDDATA; | |
279 | } | ||
280 | |||
281 |
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99 | if (width < 16 || height < 16) { |
282 | ✗ | av_log(avctx, AV_LOG_ERROR, "Dimensions too small\n"); | |
283 | ✗ | return AVERROR_INVALIDDATA; | |
284 | } | ||
285 | |||
286 |
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99 | if (avctx->width != width || avctx->height != height) { |
287 | 3 | av_frame_unref(s->last_frame); | |
288 |
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3 | if((width * (int64_t)height)/2048*7 > bytestream2_get_bytes_left(&gb)) |
289 | ✗ | return AVERROR_INVALIDDATA; | |
290 |
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3 | if ((ret = ff_set_dimensions(avctx, width, height)) < 0) |
291 | ✗ | return ret; | |
292 | } | ||
293 | |||
294 |
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99 | if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) |
295 | ✗ | return ret; | |
296 | |||
297 |
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99 | if (inter && !s->last_frame->data[0]) { |
298 | ✗ | av_log(avctx, AV_LOG_WARNING, "Missing reference frame.\n"); | |
299 | ✗ | ret = ff_get_buffer(avctx, s->last_frame, AV_GET_BUFFER_FLAG_REF); | |
300 | ✗ | if (ret < 0) | |
301 | ✗ | return ret; | |
302 | ✗ | memset(s->last_frame->data[0], 0, s->last_frame->height * | |
303 | ✗ | s->last_frame->linesize[0]); | |
304 | ✗ | memset(s->last_frame->data[1], 0x80, s->last_frame->height / 2 * | |
305 | ✗ | s->last_frame->linesize[1]); | |
306 | ✗ | memset(s->last_frame->data[2], 0x80, s->last_frame->height / 2 * | |
307 | ✗ | s->last_frame->linesize[2]); | |
308 | } | ||
309 | |||
310 | 99 | av_fast_padded_malloc(&s->bitstream_buf, &s->bitstream_buf_size, | |
311 | 99 | bytestream2_get_bytes_left(&gb)); | |
312 |
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99 | if (!s->bitstream_buf) |
313 | ✗ | return AVERROR(ENOMEM); | |
314 | 99 | s->bbdsp.bswap16_buf(s->bitstream_buf, (const uint16_t *)(buf + bytestream2_tell(&gb)), | |
315 | 99 | bytestream2_get_bytes_left(&gb) / 2); | |
316 | 99 | memset((uint8_t*)s->bitstream_buf + bytestream2_get_bytes_left(&gb), 0, AV_INPUT_BUFFER_PADDING_SIZE); | |
317 | 99 | init_get_bits(&s->gb, s->bitstream_buf, 8*(bytestream2_get_bytes_left(&gb))); | |
318 | |||
319 |
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3153 | for (s->mb_y=0; s->mb_y < (avctx->height+15)/16; s->mb_y++) |
320 |
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140276 | for (s->mb_x=0; s->mb_x < (avctx->width +15)/16; s->mb_x++) |
321 |
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137222 | if(decode_mb(s, frame, inter) < 0) |
322 | ✗ | return AVERROR_INVALIDDATA; | |
323 | |||
324 | 99 | *got_frame = 1; | |
325 | |||
326 |
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99 | if (chunk_type != MADe_TAG) { |
327 | 51 | av_frame_unref(s->last_frame); | |
328 |
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51 | if ((ret = av_frame_ref(s->last_frame, frame)) < 0) |
329 | ✗ | return ret; | |
330 | } | ||
331 | |||
332 | 99 | return buf_size; | |
333 | } | ||
334 | |||
335 | 4 | static av_cold int decode_end(AVCodecContext *avctx) | |
336 | { | ||
337 | 4 | MadContext *t = avctx->priv_data; | |
338 | 4 | av_frame_free(&t->last_frame); | |
339 | 4 | av_freep(&t->bitstream_buf); | |
340 | 4 | return 0; | |
341 | } | ||
342 | |||
343 | const FFCodec ff_eamad_decoder = { | ||
344 | .p.name = "eamad", | ||
345 | .p.long_name = NULL_IF_CONFIG_SMALL("Electronic Arts Madcow Video"), | ||
346 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
347 | .p.id = AV_CODEC_ID_MAD, | ||
348 | .priv_data_size = sizeof(MadContext), | ||
349 | .init = decode_init, | ||
350 | .close = decode_end, | ||
351 | FF_CODEC_DECODE_CB(decode_frame), | ||
352 | .p.capabilities = AV_CODEC_CAP_DR1, | ||
353 | .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, | ||
354 | }; | ||
355 |