GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/eatgv.c Lines: 155 183 84.7 %
Date: 2019-11-20 04:07:19 Branches: 83 112 74.1 %

Line Branch Exec Source
1
/*
2
 * Electronic Arts TGV Video Decoder
3
 * Copyright (c) 2007-2008 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 TGV Video Decoder
25
 * by Peter Ross (pross@xvid.org)
26
 *
27
 * Technical details here:
28
 * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TGV
29
 */
30
31
#include "libavutil/imgutils.h"
32
#include "libavutil/mem.h"
33
34
#define BITSTREAM_READER_LE
35
#include "avcodec.h"
36
#include "get_bits.h"
37
#include "internal.h"
38
39
#define EA_PREAMBLE_SIZE    8
40
#define kVGT_TAG MKTAG('k', 'V', 'G', 'T')
41
42
typedef struct TgvContext {
43
    AVCodecContext *avctx;
44
    AVFrame *last_frame;
45
    uint8_t *frame_buffer;
46
    int width,height;
47
    uint32_t palette[AVPALETTE_COUNT];
48
49
    int (*mv_codebook)[2];
50
    uint8_t (*block_codebook)[16];
51
    int num_mvs;           ///< current length of mv_codebook
52
    int num_blocks_packed; ///< current length of block_codebook
53
} TgvContext;
54
55
6
static av_cold int tgv_decode_init(AVCodecContext *avctx)
56
{
57
6
    TgvContext *s = avctx->priv_data;
58
6
    s->avctx         = avctx;
59
6
    avctx->framerate = (AVRational){ 15, 1 };
60
6
    avctx->pix_fmt   = AV_PIX_FMT_PAL8;
61
62
6
    s->last_frame = av_frame_alloc();
63
6
    if (!s->last_frame)
64
        return AVERROR(ENOMEM);
65
66
6
    return 0;
67
}
68
69
/**
70
 * Unpack buffer
71
 * @return 0 on success, -1 on critical buffer underflow
72
 */
73
11
static int unpack(const uint8_t *src, const uint8_t *src_end,
74
                  uint8_t *dst, int width, int height)
75
{
76
11
    uint8_t *dst_end = dst + width*height;
77
    int size, size1, size2, offset, run;
78
11
    uint8_t *dst_start = dst;
79
80
11
    if (src[0] & 0x01)
81
        src += 5;
82
    else
83
11
        src += 2;
84
85
11
    if (src_end - src < 3)
86
        return AVERROR_INVALIDDATA;
87
11
    size = AV_RB24(src);
88
11
    src += 3;
89
90

102029
    while (size > 0 && src < src_end) {
91
92
        /* determine size1 and size2 */
93
102018
        size1 = (src[0] & 3);
94
102018
        if (src[0] & 0x80) {  // 1
95
49446
            if (src[0] & 0x40 ) {  // 11
96
15234
                if (src[0] & 0x20) {  // 111
97
10712
                    if (src[0] < 0xFC)  // !(111111)
98
10704
                        size1 = (((src[0] & 31) + 1) << 2);
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10712
                    src++;
100
10712
                    size2 = 0;
101
                } else {  // 110
102
4522
                    offset = ((src[0] & 0x10) << 12) + AV_RB16(&src[1]) + 1;
103
4522
                    size2  = ((src[0] & 0xC) << 6) + src[3] + 5;
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4522
                    src   += 4;
105
                }
106
            } else {  // 10
107
34212
                size1  = ((src[1] & 0xC0) >> 6);
108
34212
                offset = (AV_RB16(&src[1]) & 0x3FFF) + 1;
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34212
                size2  = (src[0] & 0x3F) + 4;
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34212
                src   += 3;
111
            }
112
        } else {  // 0
113
52572
            offset = ((src[0] & 0x60) << 3) + src[1] + 1;
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52572
            size2  = ((src[0] & 0x1C) >> 2) + 3;
115
52572
            src   += 2;
116
        }
117
118
119
        /* fetch strip from src */
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102018
        if (size1 > src_end - src)
121
            break;
122
123
102018
        if (size1 > 0) {
124
35301
            size -= size1;
125
35301
            run   = FFMIN(size1, dst_end - dst);
126
35301
            memcpy(dst, src, run);
127
35301
            dst += run;
128
35301
            src += run;
129
        }
130
131
102018
        if (size2 > 0) {
132
91306
            if (dst - dst_start < offset)
133
                return 0;
134
91306
            size -= size2;
135
91306
            run   = FFMIN(size2, dst_end - dst);
136
91306
            av_memcpy_backptr(dst, offset, run);
137
91306
            dst += run;
138
        }
139
    }
140
141
11
    return 0;
142
}
143
144
/**
145
 * Decode inter-frame
146
 * @return 0 on success, -1 on critical buffer underflow
147
 */
148
79
static int tgv_decode_inter(TgvContext *s, AVFrame *frame,
149
                            const uint8_t *buf, const uint8_t *buf_end)
150
{
151
    int num_mvs;
152
    int num_blocks_raw;
153
    int num_blocks_packed;
154
    int vector_bits;
155
    int i,j,x,y;
156
    GetBitContext gb;
157
    int mvbits;
158
    const uint8_t *blocks_raw;
159
160
79
    if(buf_end - buf < 12)
161
        return AVERROR_INVALIDDATA;
162
163
79
    num_mvs           = AV_RL16(&buf[0]);
164
79
    num_blocks_raw    = AV_RL16(&buf[2]);
165
79
    num_blocks_packed = AV_RL16(&buf[4]);
166
79
    vector_bits       = AV_RL16(&buf[6]);
167
79
    buf += 12;
168
169

79
    if (vector_bits > MIN_CACHE_BITS || !vector_bits) {
170
        av_log(s->avctx, AV_LOG_ERROR,
171
               "Invalid value for motion vector bits: %d\n", vector_bits);
172
        return AVERROR_INVALIDDATA;
173
    }
174
175
    /* allocate codebook buffers as necessary */
176
79
    if (num_mvs > s->num_mvs) {
177
8
        int err = av_reallocp_array(&s->mv_codebook, num_mvs, sizeof(*s->mv_codebook));
178
8
        if (err < 0) {
179
            s->num_mvs = 0;
180
            return err;
181
        }
182
8
        s->num_mvs = num_mvs;
183
    }
184
185
79
    if (num_blocks_packed > s->num_blocks_packed) {
186
        int err;
187
7
        if ((err = av_reallocp(&s->block_codebook, num_blocks_packed * 16)) < 0) {
188
            s->num_blocks_packed = 0;
189
            return err;
190
        }
191
7
        s->num_blocks_packed = num_blocks_packed;
192
    }
193
194
    /* read motion vectors */
195
79
    mvbits = (num_mvs * 2 * 10 + 31) & ~31;
196
197
79
    if (buf_end - buf < (mvbits>>3) + 16*num_blocks_raw + 8*num_blocks_packed)
198
        return AVERROR_INVALIDDATA;
199
200
79
    init_get_bits(&gb, buf, mvbits);
201
13453
    for (i = 0; i < num_mvs; i++) {
202
13374
        s->mv_codebook[i][0] = get_sbits(&gb, 10);
203
13374
        s->mv_codebook[i][1] = get_sbits(&gb, 10);
204
    }
205
79
    buf += mvbits >> 3;
206
207
    /* note ptr to uncompressed blocks */
208
79
    blocks_raw = buf;
209
79
    buf       += num_blocks_raw * 16;
210
211
    /* read compressed blocks */
212
79
    init_get_bits(&gb, buf, (buf_end - buf) << 3);
213
31502
    for (i = 0; i < num_blocks_packed; i++) {
214
        int tmp[4];
215
157115
        for (j = 0; j < 4; j++)
216
125692
            tmp[j] = get_bits(&gb, 8);
217
534191
        for (j = 0; j < 16; j++)
218
502768
            s->block_codebook[i][15-j] = tmp[get_bits(&gb, 2)];
219
    }
220
221
79
    if (get_bits_left(&gb) < vector_bits *
222
79
        (s->avctx->height / 4) * (s->avctx->width / 4))
223
1
        return AVERROR_INVALIDDATA;
224
225
    /* read vectors and build frame */
226
4418
    for (y = 0; y < s->avctx->height / 4; y++)
227
351540
        for (x = 0; x < s->avctx->width / 4; x++) {
228
347200
            unsigned int vector = get_bits(&gb, vector_bits);
229
            const uint8_t *src;
230
            ptrdiff_t src_stride;
231
232
347200
            if (vector < num_mvs) {
233
293708
                int mx = x * 4 + s->mv_codebook[vector][0];
234
293708
                int my = y * 4 + s->mv_codebook[vector][1];
235
236

293708
                if (mx < 0 || mx + 4 > s->avctx->width ||
237
293708
                    my < 0 || my + 4 > s->avctx->height) {
238
                    av_log(s->avctx, AV_LOG_ERROR, "MV %d %d out of picture\n", mx, my);
239
                    continue;
240
                }
241
242
293708
                src = s->last_frame->data[0] + mx + my * s->last_frame->linesize[0];
243
293708
                src_stride = s->last_frame->linesize[0];
244
            } else {
245
53492
                int offset = vector - num_mvs;
246
53492
                if (offset < num_blocks_raw)
247
5411
                    src = blocks_raw + 16*offset;
248
48081
                else if (offset - num_blocks_raw < num_blocks_packed)
249
48081
                    src = s->block_codebook[offset - num_blocks_raw];
250
                else
251
                    continue;
252
53492
                src_stride = 4;
253
            }
254
255
1736000
            for (j = 0; j < 4; j++)
256
6944000
                for (i = 0; i < 4; i++)
257
5555200
                    frame->data[0][(y * 4 + j) * frame->linesize[0] + (x * 4 + i)] =
258
5555200
                        src[j * src_stride + i];
259
    }
260
261
78
    return 0;
262
}
263
264
90
static int tgv_decode_frame(AVCodecContext *avctx,
265
                            void *data, int *got_frame,
266
                            AVPacket *avpkt)
267
{
268
90
    const uint8_t *buf     = avpkt->data;
269
90
    int buf_size           = avpkt->size;
270
90
    TgvContext *s          = avctx->priv_data;
271
90
    const uint8_t *buf_end = buf + buf_size;
272
90
    AVFrame *frame         = data;
273
    int chunk_type, ret;
274
275
90
    if (buf_end - buf < EA_PREAMBLE_SIZE)
276
        return AVERROR_INVALIDDATA;
277
278
90
    chunk_type = AV_RL32(&buf[0]);
279
90
    buf       += EA_PREAMBLE_SIZE;
280
281
90
    if (chunk_type == kVGT_TAG) {
282
        int pal_count, i;
283
11
        if(buf_end - buf < 12) {
284
            av_log(avctx, AV_LOG_WARNING, "truncated header\n");
285
            return AVERROR_INVALIDDATA;
286
        }
287
288
11
        s->width  = AV_RL16(&buf[0]);
289
11
        s->height = AV_RL16(&buf[2]);
290

11
        if (s->avctx->width != s->width || s->avctx->height != s->height) {
291
4
            av_freep(&s->frame_buffer);
292
4
            av_frame_unref(s->last_frame);
293
4
            if ((ret = ff_set_dimensions(s->avctx, s->width, s->height)) < 0)
294
                return ret;
295
        }
296
297
11
        pal_count = AV_RL16(&buf[6]);
298
11
        buf += 12;
299

2827
        for(i = 0; i < pal_count && i < AVPALETTE_COUNT && buf_end - buf >= 3; i++) {
300
2816
            s->palette[i] = 0xFFU << 24 | AV_RB24(buf);
301
2816
            buf += 3;
302
        }
303
11
        if (buf_end - buf < 5) {
304
            return AVERROR_INVALIDDATA;
305
        }
306
    }
307
308
90
    if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
309
        return ret;
310
311
90
    memcpy(frame->data[1], s->palette, AVPALETTE_SIZE);
312
313
90
    if (chunk_type == kVGT_TAG) {
314
        int y;
315
11
        frame->key_frame = 1;
316
11
        frame->pict_type = AV_PICTURE_TYPE_I;
317
318
11
        if (!s->frame_buffer &&
319
6
            !(s->frame_buffer = av_mallocz(s->width * s->height)))
320
            return AVERROR(ENOMEM);
321
322
11
        if (unpack(buf, buf_end, s->frame_buffer, s->avctx->width, s->avctx->height) < 0) {
323
            av_log(avctx, AV_LOG_WARNING, "truncated intra frame\n");
324
            return AVERROR_INVALIDDATA;
325
        }
326
2411
        for (y = 0; y < s->height; y++)
327
2400
            memcpy(frame->data[0]  + y * frame->linesize[0],
328
2400
                   s->frame_buffer + y * s->width,
329
2400
                   s->width);
330
    } else {
331
79
        if (!s->last_frame->data[0]) {
332
            av_log(avctx, AV_LOG_WARNING, "inter frame without corresponding intra frame\n");
333
            return buf_size;
334
        }
335
79
        frame->key_frame = 0;
336
79
        frame->pict_type = AV_PICTURE_TYPE_P;
337
79
        if (tgv_decode_inter(s, frame, buf, buf_end) < 0) {
338
1
            av_log(avctx, AV_LOG_WARNING, "truncated inter frame\n");
339
1
            return AVERROR_INVALIDDATA;
340
        }
341
    }
342
343
89
    av_frame_unref(s->last_frame);
344
89
    if ((ret = av_frame_ref(s->last_frame, frame)) < 0)
345
        return ret;
346
347
89
    *got_frame = 1;
348
349
89
    return buf_size;
350
}
351
352
6
static av_cold int tgv_decode_end(AVCodecContext *avctx)
353
{
354
6
    TgvContext *s = avctx->priv_data;
355
6
    av_frame_free(&s->last_frame);
356
6
    av_freep(&s->frame_buffer);
357
6
    av_freep(&s->mv_codebook);
358
6
    av_freep(&s->block_codebook);
359
6
    return 0;
360
}
361
362
AVCodec ff_eatgv_decoder = {
363
    .name           = "eatgv",
364
    .long_name      = NULL_IF_CONFIG_SMALL("Electronic Arts TGV video"),
365
    .type           = AVMEDIA_TYPE_VIDEO,
366
    .id             = AV_CODEC_ID_TGV,
367
    .priv_data_size = sizeof(TgvContext),
368
    .init           = tgv_decode_init,
369
    .close          = tgv_decode_end,
370
    .decode         = tgv_decode_frame,
371
    .capabilities   = AV_CODEC_CAP_DR1,
372
};