GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/eamad.c Lines: 155 183 84.7 %
Date: 2021-01-26 11:44:58 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
 *
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 * 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"
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#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 */
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#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;
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    uint16_t quant_matrix[64];
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    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;
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4
    avctx->pix_fmt = AV_PIX_FMT_YUV420P;
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4
    ff_blockdsp_init(&s->bdsp, avctx);
72
4
    ff_bswapdsp_init(&s->bbdsp);
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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
4
    if (!s->last_frame)
80
        return AVERROR(ENOMEM);
81
82
4
    return 0;
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}
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
5986566
    for (j=0; j<8; j++)
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47892528
        for (i=0; i<8; i++)
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42571136
            dst[j*dst_stride + i] = av_clip_uint8(src[j*src_stride + i] + add);
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665174
}
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665174
static inline void comp_block(MadContext *t, AVFrame *frame,
95
                              int mb_x, int mb_y,
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                              int j, int mv_x, int mv_y, int add)
97
{
98
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;
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437978
        if (offset >= (t->avctx->height - 7) * t->last_frame->linesize[0] - 7)
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            return;
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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],
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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)) {
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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;
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227196
        comp(frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x * 8,
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227196
             frame->linesize[index],
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227196
             t->last_frame->data[index] + offset,
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227196
             t->last_frame->linesize[index], add);
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    }
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}
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158158
static inline void idct_put(MadContext *t, AVFrame *frame, int16_t *block,
119
                            int mb_x, int mb_y, int j)
120
{
121
158158
    if (j < 4) {
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110910
        ff_ea_idct_put_c(
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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);
125
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);
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    }
131
158158
}
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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;
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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
1112218
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
151
152
1112218
            if (level == 127) {
153
158158
                break;
154
954060
            } else if (level != 0) {
155
913987
                i += run;
156
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
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
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
897656
    if (get_bits1(gb)) {
203
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
137222
    if (inter) {
217
119970
        int v = decode210(&s->gb);
218
119970
        if (v < 2) {
219
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
960554
    for (j=0; j<6; j++) {
226
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
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
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
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

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
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

99
    if (width < 16 || height < 16) {
283
        av_log(avctx, AV_LOG_ERROR, "Dimensions too small\n");
284
        return AVERROR_INVALIDDATA;
285
    }
286
287

99
    if (avctx->width != width || avctx->height != height) {
288
3
        av_frame_unref(s->last_frame);
289
3
        if((width * (int64_t)height)/2048*7 > bytestream2_get_bytes_left(&gb))
290
            return AVERROR_INVALIDDATA;
291
3
        if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
292
            return ret;
293
    }
294
295
99
    if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
296
        return ret;
297
298

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
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
3153
    for (s->mb_y=0; s->mb_y < (avctx->height+15)/16; s->mb_y++)
321
140276
        for (s->mb_x=0; s->mb_x < (avctx->width +15)/16; s->mb_x++)
322
137222
            if(decode_mb(s, frame, inter) < 0)
323
                return AVERROR_INVALIDDATA;
324
325
99
    *got_frame = 1;
326
327
99
    if (chunk_type != MADe_TAG) {
328
51
        av_frame_unref(s->last_frame);
329
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
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
};