GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/eatgq.c Lines: 125 139 89.9 %
Date: 2021-01-21 21:11:50 Branches: 40 53 75.5 %

Line Branch Exec Source
1
/*
2
 * Electronic Arts TGQ Video Decoder
3
 * Copyright (c) 2007-2008 Peter Ross <pross@xvid.org>
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 TGQ Video Decoder
25
 * @author Peter Ross <pross@xvid.org>
26
 *
27
 * Technical details here:
28
 * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TGQ
29
 */
30
31
#define BITSTREAM_READER_LE
32
33
#include "libavutil/mem_internal.h"
34
35
#include "aandcttab.h"
36
#include "avcodec.h"
37
#include "bytestream.h"
38
#include "eaidct.h"
39
#include "get_bits.h"
40
#include "idctdsp.h"
41
#include "internal.h"
42
43
typedef struct TgqContext {
44
    AVCodecContext *avctx;
45
    int width, height;
46
    ScanTable scantable;
47
    int qtable[64];
48
    DECLARE_ALIGNED(16, int16_t, block)[6][64];
49
    GetByteContext gb;
50
} TgqContext;
51
52
2
static av_cold int tgq_decode_init(AVCodecContext *avctx)
53
{
54
2
    TgqContext *s = avctx->priv_data;
55
    uint8_t idct_permutation[64];
56
2
    s->avctx = avctx;
57
2
    ff_init_scantable_permutation(idct_permutation, FF_IDCT_PERM_NONE);
58
2
    ff_init_scantable(idct_permutation, &s->scantable, ff_zigzag_direct);
59
2
    avctx->framerate = (AVRational){ 15, 1 };
60
2
    avctx->pix_fmt   = AV_PIX_FMT_YUV420P;
61
2
    return 0;
62
}
63
64
101826
static void tgq_decode_block(TgqContext *s, int16_t block[64], GetBitContext *gb)
65
{
66
101826
    uint8_t *perm = s->scantable.permutated;
67
    int i, j, value;
68
101826
    block[0] = get_sbits(gb, 8) * s->qtable[0];
69
101826
    for (i = 1; i < 64;) {
70

1463527
        switch (show_bits(gb, 3)) {
71
152397
        case 4:
72
152397
            block[perm[i++]] = 0;
73
370656
        case 0:
74
370656
            block[perm[i++]] = 0;
75
370656
            skip_bits(gb, 3);
76
370656
            break;
77
148778
        case 5:
78
        case 1:
79
148778
            skip_bits(gb, 2);
80
148778
            value = get_bits(gb, 6);
81
5096670
            for (j = 0; j < value; j++)
82
4947892
                block[perm[i++]] = 0;
83
148778
            break;
84
333783
        case 6:
85
333783
            skip_bits(gb, 3);
86
333783
            block[perm[i]] = -s->qtable[perm[i]];
87
333783
            i++;
88
333783
            break;
89
339292
        case 2:
90
339292
            skip_bits(gb, 3);
91
339292
            block[perm[i]] = s->qtable[perm[i]];
92
339292
            i++;
93
339292
            break;
94
271018
        case 7: // 111b
95
        case 3: // 011b
96
271018
            skip_bits(gb, 2);
97
271018
            if (show_bits(gb, 6) == 0x3F) {
98
1440
                skip_bits(gb, 6);
99
1440
                block[perm[i]] = get_sbits(gb, 8) * s->qtable[perm[i]];
100
            } else {
101
269578
                block[perm[i]] = get_sbits(gb, 6) * s->qtable[perm[i]];
102
            }
103
271018
            i++;
104
271018
            break;
105
        }
106
1565353
    }
107
101826
    block[0] += 128 << 4;
108
101826
}
109
110
16971
static void tgq_idct_put_mb(TgqContext *s, int16_t (*block)[64], AVFrame *frame,
111
                            int mb_x, int mb_y)
112
{
113
16971
    ptrdiff_t linesize = frame->linesize[0];
114
16971
    uint8_t *dest_y  = frame->data[0] + (mb_y * 16 * linesize)           + mb_x * 16;
115
16971
    uint8_t *dest_cb = frame->data[1] + (mb_y * 8  * frame->linesize[1]) + mb_x * 8;
116
16971
    uint8_t *dest_cr = frame->data[2] + (mb_y * 8  * frame->linesize[2]) + mb_x * 8;
117
118
16971
    ff_ea_idct_put_c(dest_y                   , linesize, block[0]);
119
16971
    ff_ea_idct_put_c(dest_y                + 8, linesize, block[1]);
120
16971
    ff_ea_idct_put_c(dest_y + 8 * linesize    , linesize, block[2]);
121
16971
    ff_ea_idct_put_c(dest_y + 8 * linesize + 8, linesize, block[3]);
122
16971
    if (!(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {
123
16971
         ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
124
16971
         ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);
125
    }
126
16971
}
127
128
50508
static inline void tgq_dconly(TgqContext *s, unsigned char *dst,
129
                              ptrdiff_t dst_stride, int dc)
130
{
131
50508
    int level = av_clip_uint8((dc*s->qtable[0] + 2056) >> 4);
132
    int j;
133
454572
    for (j = 0; j < 8; j++)
134
404064
        memset(dst + j * dst_stride, level, 8);
135
50508
}
136
137
8418
static void tgq_idct_put_mb_dconly(TgqContext *s, AVFrame *frame,
138
                                   int mb_x, int mb_y, const int8_t *dc)
139
{
140
8418
    ptrdiff_t linesize = frame->linesize[0];
141
8418
    uint8_t *dest_y  = frame->data[0] + (mb_y * 16 * linesize)             + mb_x * 16;
142
8418
    uint8_t *dest_cb = frame->data[1] + (mb_y * 8  * frame->linesize[1]) + mb_x * 8;
143
8418
    uint8_t *dest_cr = frame->data[2] + (mb_y * 8  * frame->linesize[2]) + mb_x * 8;
144
8418
    tgq_dconly(s, dest_y,                    linesize, dc[0]);
145
8418
    tgq_dconly(s, dest_y                + 8, linesize, dc[1]);
146
8418
    tgq_dconly(s, dest_y + 8 * linesize,     linesize, dc[2]);
147
8418
    tgq_dconly(s, dest_y + 8 * linesize + 8, linesize, dc[3]);
148
8418
    if (!(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {
149
8418
        tgq_dconly(s, dest_cb, frame->linesize[1], dc[4]);
150
8418
        tgq_dconly(s, dest_cr, frame->linesize[2], dc[5]);
151
    }
152
8418
}
153
154
25389
static int tgq_decode_mb(TgqContext *s, AVFrame *frame, int mb_y, int mb_x)
155
{
156
    int mode;
157
    int i;
158
    int8_t dc[6];
159
160
25389
    mode = bytestream2_get_byte(&s->gb);
161
25389
    if (mode > 12) {
162
        GetBitContext gb;
163
16971
        int ret = init_get_bits8(&gb, s->gb.buffer, FFMIN(bytestream2_get_bytes_left(&s->gb), mode));
164
16971
        if (ret < 0)
165
            return ret;
166
167
118797
        for (i = 0; i < 6; i++)
168
101826
            tgq_decode_block(s, s->block[i], &gb);
169
16971
        tgq_idct_put_mb(s, s->block, frame, mb_x, mb_y);
170
16971
        bytestream2_skip(&s->gb, mode);
171
    } else {
172
8418
        if (mode == 3) {
173
            memset(dc, bytestream2_get_byte(&s->gb), 4);
174
            dc[4] = bytestream2_get_byte(&s->gb);
175
            dc[5] = bytestream2_get_byte(&s->gb);
176
8418
        } else if (mode == 6) {
177
            bytestream2_get_buffer(&s->gb, dc, 6);
178
8418
        } else if (mode == 12) {
179
58926
            for (i = 0; i < 6; i++) {
180
50508
                dc[i] = bytestream2_get_byte(&s->gb);
181
50508
                bytestream2_skip(&s->gb, 1);
182
            }
183
        } else {
184
            av_log(s->avctx, AV_LOG_ERROR, "unsupported mb mode %i\n", mode);
185
            return -1;
186
        }
187
8418
        tgq_idct_put_mb_dconly(s, frame, mb_x, mb_y, dc);
188
    }
189
25389
    return 0;
190
}
191
192
279
static void tgq_calculate_qtable(TgqContext *s, int quant)
193
{
194
    int i, j;
195
279
    const int a = (14 * (100 - quant)) / 100 + 1;
196
279
    const int b = (11 * (100 - quant)) / 100 + 4;
197
2511
    for (j = 0; j < 8; j++)
198
20088
        for (i = 0; i < 8; i++)
199
17856
            s->qtable[j * 8 + i] = ((a * (j + i) / (7 + 7) + b) *
200
17856
                                    ff_inv_aanscales[j * 8 + i]) >> (14 - 4);
201
279
}
202
203
279
static int tgq_decode_frame(AVCodecContext *avctx,
204
                            void *data, int *got_frame,
205
                            AVPacket *avpkt)
206
{
207
279
    const uint8_t *buf = avpkt->data;
208
279
    int buf_size       = avpkt->size;
209
279
    TgqContext *s      = avctx->priv_data;
210
279
    AVFrame *frame     = data;
211
    int x, y, ret;
212
    int big_endian;
213
214
279
    if (buf_size < 16) {
215
        av_log(avctx, AV_LOG_WARNING, "truncated header\n");
216
        return AVERROR_INVALIDDATA;
217
    }
218
279
    big_endian = AV_RL32(&buf[4]) > 0x000FFFFF;
219
279
    bytestream2_init(&s->gb, buf + 8, buf_size - 8);
220
279
    if (big_endian) {
221
279
        s->width  = bytestream2_get_be16u(&s->gb);
222
279
        s->height = bytestream2_get_be16u(&s->gb);
223
    } else {
224
        s->width  = bytestream2_get_le16u(&s->gb);
225
        s->height = bytestream2_get_le16u(&s->gb);
226
    }
227
228
279
    ret = ff_set_dimensions(s->avctx, s->width, s->height);
229
279
    if (ret < 0)
230
        return ret;
231
232
279
    tgq_calculate_qtable(s, bytestream2_get_byteu(&s->gb));
233
279
    bytestream2_skip(&s->gb, 3);
234
235
279
    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
236
        return ret;
237
279
    frame->key_frame = 1;
238
279
    frame->pict_type = AV_PICTURE_TYPE_I;
239
240
2232
    for (y = 0; y < FFALIGN(avctx->height, 16) >> 4; y++)
241
27342
        for (x = 0; x < FFALIGN(avctx->width, 16) >> 4; x++)
242
25389
            if (tgq_decode_mb(s, frame, y, x) < 0)
243
                return AVERROR_INVALIDDATA;
244
245
279
    *got_frame = 1;
246
247
279
    return avpkt->size;
248
}
249
250
AVCodec ff_eatgq_decoder = {
251
    .name           = "eatgq",
252
    .long_name      = NULL_IF_CONFIG_SMALL("Electronic Arts TGQ video"),
253
    .type           = AVMEDIA_TYPE_VIDEO,
254
    .id             = AV_CODEC_ID_TGQ,
255
    .priv_data_size = sizeof(TgqContext),
256
    .init           = tgq_decode_init,
257
    .decode         = tgq_decode_frame,
258
    .capabilities   = AV_CODEC_CAP_DR1,
259
};