GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/eamad.c Lines: 155 183 84.7 %
Date: 2019-11-18 18:00:01 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 "avcodec.h"
32
#include "blockdsp.h"
33
#include "bytestream.h"
34
#include "bswapdsp.h"
35
#include "get_bits.h"
36
#include "aandcttab.h"
37
#include "eaidct.h"
38
#include "idctdsp.h"
39
#include "internal.h"
40
#include "mpeg12data.h"
41
#include "mpeg12vlc.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(32, int16_t, block)[64];
58
    ScanTable scantable;
59
    uint16_t quant_matrix[64];
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    int mb_x;
61
    int mb_y;
62
} MadContext;
63
64
4
static av_cold int decode_init(AVCodecContext *avctx)
65
{
66
4
    MadContext *s = avctx->priv_data;
67
4
    s->avctx = avctx;
68
4
    avctx->pix_fmt = AV_PIX_FMT_YUV420P;
69
4
    ff_blockdsp_init(&s->bdsp, avctx);
70
4
    ff_bswapdsp_init(&s->bbdsp);
71
4
    ff_idctdsp_init(&s->idsp, avctx);
72
4
    ff_init_scantable_permutation(s->idsp.idct_permutation, FF_IDCT_PERM_NONE);
73
4
    ff_init_scantable(s->idsp.idct_permutation, &s->scantable, ff_zigzag_direct);
74
4
    ff_mpeg12_init_vlcs();
75
76
4
    s->last_frame = av_frame_alloc();
77
4
    if (!s->last_frame)
78
        return AVERROR(ENOMEM);
79
80
4
    return 0;
81
}
82
83
665174
static inline void comp(unsigned char *dst, ptrdiff_t dst_stride,
84
                        unsigned char *src, ptrdiff_t src_stride, int add)
85
{
86
    int j, i;
87
5986566
    for (j=0; j<8; j++)
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47892528
        for (i=0; i<8; i++)
89
42571136
            dst[j*dst_stride + i] = av_clip_uint8(src[j*src_stride + i] + add);
90
665174
}
91
92
665174
static inline void comp_block(MadContext *t, AVFrame *frame,
93
                              int mb_x, int mb_y,
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                              int j, int mv_x, int mv_y, int add)
95
{
96
665174
    if (j < 4) {
97
437978
        unsigned offset = (mb_y*16 + ((j&2)<<2) + mv_y)*t->last_frame->linesize[0] + mb_x*16 + ((j&1)<<3) + mv_x;
98
437978
        if (offset >= (t->avctx->height - 7) * t->last_frame->linesize[0] - 7)
99
            return;
100
437978
        comp(frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3),
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437978
             frame->linesize[0],
102
437978
             t->last_frame->data[0] + offset,
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437978
             t->last_frame->linesize[0], add);
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227196
    } else if (!(t->avctx->flags & AV_CODEC_FLAG_GRAY)) {
105
227196
        int index = j - 3;
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227196
        unsigned offset = (mb_y * 8 + (mv_y/2))*t->last_frame->linesize[index] + mb_x * 8 + (mv_x/2);
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227196
        if (offset >= (t->avctx->height/2 - 7) * t->last_frame->linesize[index] - 7)
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            return;
109
227196
        comp(frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x * 8,
110
227196
             frame->linesize[index],
111
227196
             t->last_frame->data[index] + offset,
112
227196
             t->last_frame->linesize[index], add);
113
    }
114
}
115
116
158158
static inline void idct_put(MadContext *t, AVFrame *frame, int16_t *block,
117
                            int mb_x, int mb_y, int j)
118
{
119
158158
    if (j < 4) {
120
110910
        ff_ea_idct_put_c(
121
110910
            frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3),
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110910
            frame->linesize[0], block);
123
47248
    } else if (!(t->avctx->flags & AV_CODEC_FLAG_GRAY)) {
124
47248
        int index = j - 3;
125
47248
        ff_ea_idct_put_c(
126
47248
            frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x*8,
127
47248
            frame->linesize[index], block);
128
    }
129
158158
}
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131
158158
static inline int decode_block_intra(MadContext *s, int16_t * block)
132
{
133
    int level, i, j, run;
134
158158
    RLTable *rl = &ff_rl_mpeg1;
135
158158
    const uint8_t *scantable = s->scantable.permutated;
136
158158
    int16_t *quant_matrix = s->quant_matrix;
137
138
158158
    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
158158
    i = 0;
143
    {
144
158158
        OPEN_READER(re, &s->gb);
145
        /* now quantify & encode AC coefficients */
146
        for (;;) {
147
1112218
            UPDATE_CACHE(re, &s->gb);
148
1112218
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
149
150
1112218
            if (level == 127) {
151
158158
                break;
152
954060
            } else if (level != 0) {
153
913987
                i += run;
154
913987
                if (i > 63) {
155
                    av_log(s->avctx, AV_LOG_ERROR,
156
                           "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
157
                    return -1;
158
                }
159
913987
                j = scantable[i];
160
913987
                level = (level*quant_matrix[j]) >> 4;
161
913987
                level = (level-1)|1;
162
913987
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
163
913987
                LAST_SKIP_BITS(re, &s->gb, 1);
164
            } else {
165
                /* escape */
166
40073
                UPDATE_CACHE(re, &s->gb);
167
40073
                level = SHOW_SBITS(re, &s->gb, 10); SKIP_BITS(re, &s->gb, 10);
168
169
40073
                UPDATE_CACHE(re, &s->gb);
170
40073
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
171
172
40073
                i += run;
173
40073
                if (i > 63) {
174
                    av_log(s->avctx, AV_LOG_ERROR,
175
                           "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
176
                    return -1;
177
                }
178
40073
                j = scantable[i];
179
40073
                if (level < 0) {
180
20920
                    level = -level;
181
20920
                    level = (level*quant_matrix[j]) >> 4;
182
20920
                    level = (level-1)|1;
183
20920
                    level = -level;
184
                } else {
185
19153
                    level = (level*quant_matrix[j]) >> 4;
186
19153
                    level = (level-1)|1;
187
                }
188
            }
189
190
954060
            block[j] = level;
191
        }
192
158158
        CLOSE_READER(re, &s->gb);
193
    }
194
158158
    return 0;
195
}
196
197
897656
static int decode_motion(GetBitContext *gb)
198
{
199
897656
    int value = 0;
200
897656
    if (get_bits1(gb)) {
201
300433
        if (get_bits1(gb))
202
163614
            value = -17;
203
300433
        value += get_bits(gb, 4) + 1;
204
    }
205
897656
    return value;
206
}
207
208
137222
static int decode_mb(MadContext *s, AVFrame *frame, int inter)
209
{
210
137222
    int mv_map = 0;
211
137222
    int av_uninit(mv_x), av_uninit(mv_y);
212
    int j;
213
214
137222
    if (inter) {
215
119970
        int v = decode210(&s->gb);
216
119970
        if (v < 2) {
217
116241
            mv_map = v ? get_bits(&s->gb, 6) : 63;
218
116241
            mv_x = decode_motion(&s->gb);
219
116241
            mv_y = decode_motion(&s->gb);
220
        }
221
    }
222
223
960554
    for (j=0; j<6; j++) {
224
823332
        if (mv_map & (1<<j)) {  // mv_x and mv_y are guarded by mv_map
225
665174
            int add = 2*decode_motion(&s->gb);
226
665174
            if (s->last_frame->data[0])
227
665174
                comp_block(s, frame, s->mb_x, s->mb_y, j, mv_x, mv_y, add);
228
        } else {
229
158158
            s->bdsp.clear_block(s->block);
230
158158
            if(decode_block_intra(s, s->block) < 0)
231
                return -1;
232
158158
            idct_put(s, frame, s->block, s->mb_x, s->mb_y, j);
233
        }
234
    }
235
137222
    return 0;
236
}
237
238
99
static void calc_quant_matrix(MadContext *s, int qscale)
239
{
240
    int i;
241
242
99
    s->quant_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0]) >> 11;
243
6336
    for (i=1; i<64; i++)
244
6237
        s->quant_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32) >> 10;
245
99
}
246
247
99
static int decode_frame(AVCodecContext *avctx,
248
                        void *data, int *got_frame,
249
                        AVPacket *avpkt)
250
{
251
99
    const uint8_t *buf = avpkt->data;
252
99
    int buf_size       = avpkt->size;
253
99
    MadContext *s     = avctx->priv_data;
254
99
    AVFrame *frame    = data;
255
    GetByteContext gb;
256
    int width, height;
257
    int chunk_type;
258
    int inter, ret;
259
260
99
    bytestream2_init(&gb, buf, buf_size);
261
262
99
    chunk_type = bytestream2_get_le32(&gb);
263

99
    inter = (chunk_type == MADm_TAG || chunk_type == MADe_TAG);
264
99
    bytestream2_skip(&gb, 10);
265
266
99
    av_reduce(&avctx->framerate.den, &avctx->framerate.num,
267
99
              bytestream2_get_le16(&gb), 1000, 1<<30);
268
269
99
    width  = bytestream2_get_le16(&gb);
270
99
    height = bytestream2_get_le16(&gb);
271
99
    bytestream2_skip(&gb, 1);
272
99
    calc_quant_matrix(s, bytestream2_get_byte(&gb));
273
99
    bytestream2_skip(&gb, 2);
274
275
99
    if (bytestream2_get_bytes_left(&gb) < 2) {
276
        av_log(avctx, AV_LOG_ERROR, "Input data too small\n");
277
        return AVERROR_INVALIDDATA;
278
    }
279
280

99
    if (width < 16 || height < 16) {
281
        av_log(avctx, AV_LOG_ERROR, "Dimensions too small\n");
282
        return AVERROR_INVALIDDATA;
283
    }
284
285

99
    if (avctx->width != width || avctx->height != height) {
286
3
        av_frame_unref(s->last_frame);
287
3
        if((width * (int64_t)height)/2048*7 > bytestream2_get_bytes_left(&gb))
288
            return AVERROR_INVALIDDATA;
289
3
        if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
290
            return ret;
291
    }
292
293
99
    if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
294
        return ret;
295
296

99
    if (inter && !s->last_frame->data[0]) {
297
        av_log(avctx, AV_LOG_WARNING, "Missing reference frame.\n");
298
        ret = ff_get_buffer(avctx, s->last_frame, AV_GET_BUFFER_FLAG_REF);
299
        if (ret < 0)
300
            return ret;
301
        memset(s->last_frame->data[0], 0, s->last_frame->height *
302
               s->last_frame->linesize[0]);
303
        memset(s->last_frame->data[1], 0x80, s->last_frame->height / 2 *
304
               s->last_frame->linesize[1]);
305
        memset(s->last_frame->data[2], 0x80, s->last_frame->height / 2 *
306
               s->last_frame->linesize[2]);
307
    }
308
309
99
    av_fast_padded_malloc(&s->bitstream_buf, &s->bitstream_buf_size,
310
99
                          bytestream2_get_bytes_left(&gb));
311
99
    if (!s->bitstream_buf)
312
        return AVERROR(ENOMEM);
313
99
    s->bbdsp.bswap16_buf(s->bitstream_buf, (const uint16_t *)(buf + bytestream2_tell(&gb)),
314
99
                         bytestream2_get_bytes_left(&gb) / 2);
315
99
    memset((uint8_t*)s->bitstream_buf + bytestream2_get_bytes_left(&gb), 0, AV_INPUT_BUFFER_PADDING_SIZE);
316
99
    init_get_bits(&s->gb, s->bitstream_buf, 8*(bytestream2_get_bytes_left(&gb)));
317
318
3153
    for (s->mb_y=0; s->mb_y < (avctx->height+15)/16; s->mb_y++)
319
140276
        for (s->mb_x=0; s->mb_x < (avctx->width +15)/16; s->mb_x++)
320
137222
            if(decode_mb(s, frame, inter) < 0)
321
                return AVERROR_INVALIDDATA;
322
323
99
    *got_frame = 1;
324
325
99
    if (chunk_type != MADe_TAG) {
326
51
        av_frame_unref(s->last_frame);
327
51
        if ((ret = av_frame_ref(s->last_frame, frame)) < 0)
328
            return ret;
329
    }
330
331
99
    return buf_size;
332
}
333
334
4
static av_cold int decode_end(AVCodecContext *avctx)
335
{
336
4
    MadContext *t = avctx->priv_data;
337
4
    av_frame_free(&t->last_frame);
338
4
    av_freep(&t->bitstream_buf);
339
4
    return 0;
340
}
341
342
AVCodec ff_eamad_decoder = {
343
    .name           = "eamad",
344
    .long_name      = NULL_IF_CONFIG_SMALL("Electronic Arts Madcow Video"),
345
    .type           = AVMEDIA_TYPE_VIDEO,
346
    .id             = AV_CODEC_ID_MAD,
347
    .priv_data_size = sizeof(MadContext),
348
    .init           = decode_init,
349
    .close          = decode_end,
350
    .decode         = decode_frame,
351
    .capabilities   = AV_CODEC_CAP_DR1,
352
};