FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/eamad.c
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 155 183 84.7%
Branches: 66 88 75.0%

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_internal.h"
32
33 #include "avcodec.h"
34 #include "blockdsp.h"
35 #include "bytestream.h"
36 #include "bswapdsp.h"
37 #include "get_bits.h"
38 #include "aandcttab.h"
39 #include "eaidct.h"
40 #include "idctdsp.h"
41 #include "internal.h"
42 #include "mpeg12data.h"
43 #include "mpeg12vlc.h"
44
45 #define EA_PREAMBLE_SIZE 8
46 #define MADk_TAG MKTAG('M', 'A', 'D', 'k') /* MAD I-frame */
47 #define MADm_TAG MKTAG('M', 'A', 'D', 'm') /* MAD P-frame */
48 #define MADe_TAG MKTAG('M', 'A', 'D', 'e') /* MAD lqp-frame */
49
50 typedef struct MadContext {
51 AVCodecContext *avctx;
52 BlockDSPContext bdsp;
53 BswapDSPContext bbdsp;
54 IDCTDSPContext idsp;
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 ScanTable scantable;
61 uint16_t quant_matrix[64];
62 int mb_x;
63 int mb_y;
64 } MadContext;
65
66 4 static av_cold int decode_init(AVCodecContext *avctx)
67 {
68 4 MadContext *s = avctx->priv_data;
69 4 s->avctx = avctx;
70 4 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
71 4 ff_blockdsp_init(&s->bdsp, avctx);
72 4 ff_bswapdsp_init(&s->bbdsp);
73 4 ff_idctdsp_init(&s->idsp, avctx);
74 4 ff_init_scantable_permutation(s->idsp.idct_permutation, FF_IDCT_PERM_NONE);
75 4 ff_init_scantable(s->idsp.idct_permutation, &s->scantable, ff_zigzag_direct);
76 4 ff_mpeg12_init_vlcs();
77
78 4 s->last_frame = av_frame_alloc();
79
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4 if (!s->last_frame)
80 return AVERROR(ENOMEM);
81
82 4 return 0;
83 }
84
85 665174 static inline void comp(unsigned char *dst, ptrdiff_t dst_stride,
86 unsigned char *src, ptrdiff_t src_stride, int add)
87 {
88 int j, i;
89
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5986566 for (j=0; j<8; j++)
90
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47892528 for (i=0; i<8; i++)
91 42571136 dst[j*dst_stride + i] = av_clip_uint8(src[j*src_stride + i] + add);
92 665174 }
93
94 665174 static inline void comp_block(MadContext *t, AVFrame *frame,
95 int mb_x, int mb_y,
96 int j, int mv_x, int mv_y, int add)
97 {
98
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665174 if (j < 4) {
99 437978 unsigned offset = (mb_y*16 + ((j&2)<<2) + mv_y)*t->last_frame->linesize[0] + mb_x*16 + ((j&1)<<3) + mv_x;
100
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437978 if (offset >= (t->avctx->height - 7) * t->last_frame->linesize[0] - 7)
101 return;
102 437978 comp(frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3),
103 437978 frame->linesize[0],
104 437978 t->last_frame->data[0] + offset,
105 437978 t->last_frame->linesize[0], add);
106
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227196 } else if (!(t->avctx->flags & AV_CODEC_FLAG_GRAY)) {
107 227196 int index = j - 3;
108 227196 unsigned offset = (mb_y * 8 + (mv_y/2))*t->last_frame->linesize[index] + mb_x * 8 + (mv_x/2);
109
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227196 if (offset >= (t->avctx->height/2 - 7) * t->last_frame->linesize[index] - 7)
110 return;
111 227196 comp(frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x * 8,
112 227196 frame->linesize[index],
113 227196 t->last_frame->data[index] + offset,
114 227196 t->last_frame->linesize[index], add);
115 }
116 }
117
118 158158 static inline void idct_put(MadContext *t, AVFrame *frame, int16_t *block,
119 int mb_x, int mb_y, int j)
120 {
121
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158158 if (j < 4) {
122 110910 ff_ea_idct_put_c(
123 110910 frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3),
124 110910 frame->linesize[0], block);
125
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47248 } else if (!(t->avctx->flags & AV_CODEC_FLAG_GRAY)) {
126 47248 int index = j - 3;
127 47248 ff_ea_idct_put_c(
128 47248 frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x*8,
129 47248 frame->linesize[index], block);
130 }
131 158158 }
132
133 158158 static inline int decode_block_intra(MadContext *s, int16_t * block)
134 {
135 int level, i, j, run;
136 158158 RLTable *rl = &ff_rl_mpeg1;
137 158158 const uint8_t *scantable = s->scantable.permutated;
138 158158 int16_t *quant_matrix = s->quant_matrix;
139
140 158158 block[0] = (128 + get_sbits(&s->gb, 8)) * quant_matrix[0];
141
142 /* The RL decoder is derived from mpeg1_decode_block_intra;
143 Escaped level and run values a decoded differently */
144 158158 i = 0;
145 {
146 158158 OPEN_READER(re, &s->gb);
147 /* now quantify & encode AC coefficients */
148 for (;;) {
149 1112218 UPDATE_CACHE(re, &s->gb);
150
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1112218 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
151
152
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1112218 if (level == 127) {
153 158158 break;
154
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954060 } else if (level != 0) {
155 913987 i += run;
156
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913987 if (i > 63) {
157 av_log(s->avctx, AV_LOG_ERROR,
158 "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
159 return -1;
160 }
161 913987 j = scantable[i];
162 913987 level = (level*quant_matrix[j]) >> 4;
163 913987 level = (level-1)|1;
164 913987 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
165 913987 LAST_SKIP_BITS(re, &s->gb, 1);
166 } else {
167 /* escape */
168 40073 UPDATE_CACHE(re, &s->gb);
169 40073 level = SHOW_SBITS(re, &s->gb, 10); SKIP_BITS(re, &s->gb, 10);
170
171 40073 UPDATE_CACHE(re, &s->gb);
172 40073 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
173
174 40073 i += run;
175
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40073 if (i > 63) {
176 av_log(s->avctx, AV_LOG_ERROR,
177 "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
178 return -1;
179 }
180 40073 j = scantable[i];
181
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40073 if (level < 0) {
182 20920 level = -level;
183 20920 level = (level*quant_matrix[j]) >> 4;
184 20920 level = (level-1)|1;
185 20920 level = -level;
186 } else {
187 19153 level = (level*quant_matrix[j]) >> 4;
188 19153 level = (level-1)|1;
189 }
190 }
191
192 954060 block[j] = level;
193 }
194 158158 CLOSE_READER(re, &s->gb);
195 }
196 158158 return 0;
197 }
198
199 897656 static int decode_motion(GetBitContext *gb)
200 {
201 897656 int value = 0;
202
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897656 if (get_bits1(gb)) {
203
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300433 if (get_bits1(gb))
204 163614 value = -17;
205 300433 value += get_bits(gb, 4) + 1;
206 }
207 897656 return value;
208 }
209
210 137222 static int decode_mb(MadContext *s, AVFrame *frame, int inter)
211 {
212 137222 int mv_map = 0;
213 137222 int av_uninit(mv_x), av_uninit(mv_y);
214 int j;
215
216
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137222 if (inter) {
217 119970 int v = decode210(&s->gb);
218
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119970 if (v < 2) {
219
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116241 mv_map = v ? get_bits(&s->gb, 6) : 63;
220 116241 mv_x = decode_motion(&s->gb);
221 116241 mv_y = decode_motion(&s->gb);
222 }
223 }
224
225
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960554 for (j=0; j<6; j++) {
226
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823332 if (mv_map & (1<<j)) { // mv_x and mv_y are guarded by mv_map
227 665174 int add = 2*decode_motion(&s->gb);
228
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665174 if (s->last_frame->data[0])
229 665174 comp_block(s, frame, s->mb_x, s->mb_y, j, mv_x, mv_y, add);
230 } else {
231 158158 s->bdsp.clear_block(s->block);
232
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158158 if(decode_block_intra(s, s->block) < 0)
233 return -1;
234 158158 idct_put(s, frame, s->block, s->mb_x, s->mb_y, j);
235 }
236 }
237 137222 return 0;
238 }
239
240 99 static void calc_quant_matrix(MadContext *s, int qscale)
241 {
242 int i;
243
244 99 s->quant_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0]) >> 11;
245
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6336 for (i=1; i<64; i++)
246 6237 s->quant_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32) >> 10;
247 99 }
248
249 99 static int decode_frame(AVCodecContext *avctx,
250 void *data, int *got_frame,
251 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 99 AVFrame *frame = data;
257 GetByteContext gb;
258 int width, height;
259 int chunk_type;
260 int inter, ret;
261
262 99 bytestream2_init(&gb, buf, buf_size);
263
264 99 chunk_type = bytestream2_get_le32(&gb);
265
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99 inter = (chunk_type == MADm_TAG || chunk_type == MADe_TAG);
266 99 bytestream2_skip(&gb, 10);
267
268 99 av_reduce(&avctx->framerate.den, &avctx->framerate.num,
269 99 bytestream2_get_le16(&gb), 1000, 1<<30);
270
271 99 width = bytestream2_get_le16(&gb);
272 99 height = bytestream2_get_le16(&gb);
273 99 bytestream2_skip(&gb, 1);
274 99 calc_quant_matrix(s, bytestream2_get_byte(&gb));
275 99 bytestream2_skip(&gb, 2);
276
277
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99 if (bytestream2_get_bytes_left(&gb) < 2) {
278 av_log(avctx, AV_LOG_ERROR, "Input data too small\n");
279 return AVERROR_INVALIDDATA;
280 }
281
282
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99 if (width < 16 || height < 16) {
283 av_log(avctx, AV_LOG_ERROR, "Dimensions too small\n");
284 return AVERROR_INVALIDDATA;
285 }
286
287
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99 if (avctx->width != width || avctx->height != height) {
288 3 av_frame_unref(s->last_frame);
289
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3 if((width * (int64_t)height)/2048*7 > bytestream2_get_bytes_left(&gb))
290 return AVERROR_INVALIDDATA;
291
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3 if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
292 return ret;
293 }
294
295
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99 if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
296 return ret;
297
298
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99 if (inter && !s->last_frame->data[0]) {
299 av_log(avctx, AV_LOG_WARNING, "Missing reference frame.\n");
300 ret = ff_get_buffer(avctx, s->last_frame, AV_GET_BUFFER_FLAG_REF);
301 if (ret < 0)
302 return ret;
303 memset(s->last_frame->data[0], 0, s->last_frame->height *
304 s->last_frame->linesize[0]);
305 memset(s->last_frame->data[1], 0x80, s->last_frame->height / 2 *
306 s->last_frame->linesize[1]);
307 memset(s->last_frame->data[2], 0x80, s->last_frame->height / 2 *
308 s->last_frame->linesize[2]);
309 }
310
311 99 av_fast_padded_malloc(&s->bitstream_buf, &s->bitstream_buf_size,
312 99 bytestream2_get_bytes_left(&gb));
313
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99 if (!s->bitstream_buf)
314 return AVERROR(ENOMEM);
315 99 s->bbdsp.bswap16_buf(s->bitstream_buf, (const uint16_t *)(buf + bytestream2_tell(&gb)),
316 99 bytestream2_get_bytes_left(&gb) / 2);
317 99 memset((uint8_t*)s->bitstream_buf + bytestream2_get_bytes_left(&gb), 0, AV_INPUT_BUFFER_PADDING_SIZE);
318 99 init_get_bits(&s->gb, s->bitstream_buf, 8*(bytestream2_get_bytes_left(&gb)));
319
320
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3153 for (s->mb_y=0; s->mb_y < (avctx->height+15)/16; s->mb_y++)
321
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140276 for (s->mb_x=0; s->mb_x < (avctx->width +15)/16; s->mb_x++)
322
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137222 if(decode_mb(s, frame, inter) < 0)
323 return AVERROR_INVALIDDATA;
324
325 99 *got_frame = 1;
326
327
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99 if (chunk_type != MADe_TAG) {
328 51 av_frame_unref(s->last_frame);
329
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51 if ((ret = av_frame_ref(s->last_frame, frame)) < 0)
330 return ret;
331 }
332
333 99 return buf_size;
334 }
335
336 4 static av_cold int decode_end(AVCodecContext *avctx)
337 {
338 4 MadContext *t = avctx->priv_data;
339 4 av_frame_free(&t->last_frame);
340 4 av_freep(&t->bitstream_buf);
341 4 return 0;
342 }
343
344 const AVCodec ff_eamad_decoder = {
345 .name = "eamad",
346 .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts Madcow Video"),
347 .type = AVMEDIA_TYPE_VIDEO,
348 .id = AV_CODEC_ID_MAD,
349 .priv_data_size = sizeof(MadContext),
350 .init = decode_init,
351 .close = decode_end,
352 .decode = decode_frame,
353 .capabilities = AV_CODEC_CAP_DR1,
354 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
355 };
356