FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/eatgq.c
Date: 2022-07-04 00:18:54
Exec Total Coverage
Lines: 123 137 89.8%
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 "codec_internal.h"
39 #include "eaidct.h"
40 #include "get_bits.h"
41 #include "idctdsp.h"
42 #include "internal.h"
43
44 typedef struct TgqContext {
45 AVCodecContext *avctx;
46 int width, height;
47 ScanTable scantable;
48 int qtable[64];
49 DECLARE_ALIGNED(16, int16_t, block)[6][64];
50 GetByteContext gb;
51 } TgqContext;
52
53 2 static av_cold int tgq_decode_init(AVCodecContext *avctx)
54 {
55 2 TgqContext *s = avctx->priv_data;
56 uint8_t idct_permutation[64];
57 2 s->avctx = avctx;
58 2 ff_init_scantable_permutation(idct_permutation, FF_IDCT_PERM_NONE);
59 2 ff_init_scantable(idct_permutation, &s->scantable, ff_zigzag_direct);
60 2 avctx->framerate = (AVRational){ 15, 1 };
61 2 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
62 2 return 0;
63 }
64
65 101826 static void tgq_decode_block(TgqContext *s, int16_t block[64], GetBitContext *gb)
66 {
67 101826 uint8_t *perm = s->scantable.permutated;
68 int i, j, value;
69 101826 block[0] = get_sbits(gb, 8) * s->qtable[0];
70
2/2
✓ Branch 0 taken 1463527 times.
✓ Branch 1 taken 101826 times.
1565353 for (i = 1; i < 64;) {
71
6/7
✓ Branch 1 taken 152397 times.
✓ Branch 2 taken 218259 times.
✓ Branch 3 taken 148778 times.
✓ Branch 4 taken 333783 times.
✓ Branch 5 taken 339292 times.
✓ Branch 6 taken 271018 times.
✗ Branch 7 not taken.
1463527 switch (show_bits(gb, 3)) {
72 152397 case 4:
73 152397 block[perm[i++]] = 0;
74 370656 case 0:
75 370656 block[perm[i++]] = 0;
76 370656 skip_bits(gb, 3);
77 370656 break;
78 148778 case 5:
79 case 1:
80 148778 skip_bits(gb, 2);
81 148778 value = get_bits(gb, 6);
82
2/2
✓ Branch 0 taken 4947892 times.
✓ Branch 1 taken 148778 times.
5096670 for (j = 0; j < value; j++)
83 4947892 block[perm[i++]] = 0;
84 148778 break;
85 333783 case 6:
86 333783 skip_bits(gb, 3);
87 333783 block[perm[i]] = -s->qtable[perm[i]];
88 333783 i++;
89 333783 break;
90 339292 case 2:
91 339292 skip_bits(gb, 3);
92 339292 block[perm[i]] = s->qtable[perm[i]];
93 339292 i++;
94 339292 break;
95 271018 case 7: // 111b
96 case 3: // 011b
97 271018 skip_bits(gb, 2);
98
2/2
✓ Branch 1 taken 1440 times.
✓ Branch 2 taken 269578 times.
271018 if (show_bits(gb, 6) == 0x3F) {
99 1440 skip_bits(gb, 6);
100 1440 block[perm[i]] = get_sbits(gb, 8) * s->qtable[perm[i]];
101 } else {
102 269578 block[perm[i]] = get_sbits(gb, 6) * s->qtable[perm[i]];
103 }
104 271018 i++;
105 271018 break;
106 }
107 }
108 101826 block[0] += 128 << 4;
109 101826 }
110
111 16971 static void tgq_idct_put_mb(TgqContext *s, int16_t (*block)[64], AVFrame *frame,
112 int mb_x, int mb_y)
113 {
114 16971 ptrdiff_t linesize = frame->linesize[0];
115 16971 uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16;
116 16971 uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
117 16971 uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
118
119 16971 ff_ea_idct_put_c(dest_y , linesize, block[0]);
120 16971 ff_ea_idct_put_c(dest_y + 8, linesize, block[1]);
121 16971 ff_ea_idct_put_c(dest_y + 8 * linesize , linesize, block[2]);
122 16971 ff_ea_idct_put_c(dest_y + 8 * linesize + 8, linesize, block[3]);
123
1/2
✓ Branch 0 taken 16971 times.
✗ Branch 1 not taken.
16971 if (!(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {
124 16971 ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
125 16971 ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);
126 }
127 16971 }
128
129 50508 static inline void tgq_dconly(TgqContext *s, unsigned char *dst,
130 ptrdiff_t dst_stride, int dc)
131 {
132 50508 int level = av_clip_uint8((dc*s->qtable[0] + 2056) >> 4);
133 int j;
134
2/2
✓ Branch 0 taken 404064 times.
✓ Branch 1 taken 50508 times.
454572 for (j = 0; j < 8; j++)
135 404064 memset(dst + j * dst_stride, level, 8);
136 50508 }
137
138 8418 static void tgq_idct_put_mb_dconly(TgqContext *s, AVFrame *frame,
139 int mb_x, int mb_y, const int8_t *dc)
140 {
141 8418 ptrdiff_t linesize = frame->linesize[0];
142 8418 uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16;
143 8418 uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
144 8418 uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
145 8418 tgq_dconly(s, dest_y, linesize, dc[0]);
146 8418 tgq_dconly(s, dest_y + 8, linesize, dc[1]);
147 8418 tgq_dconly(s, dest_y + 8 * linesize, linesize, dc[2]);
148 8418 tgq_dconly(s, dest_y + 8 * linesize + 8, linesize, dc[3]);
149
1/2
✓ Branch 0 taken 8418 times.
✗ Branch 1 not taken.
8418 if (!(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {
150 8418 tgq_dconly(s, dest_cb, frame->linesize[1], dc[4]);
151 8418 tgq_dconly(s, dest_cr, frame->linesize[2], dc[5]);
152 }
153 8418 }
154
155 25389 static int tgq_decode_mb(TgqContext *s, AVFrame *frame, int mb_y, int mb_x)
156 {
157 int mode;
158 int i;
159 int8_t dc[6];
160
161 25389 mode = bytestream2_get_byte(&s->gb);
162
2/2
✓ Branch 0 taken 16971 times.
✓ Branch 1 taken 8418 times.
25389 if (mode > 12) {
163 GetBitContext gb;
164
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 16971 times.
16971 int ret = init_get_bits8(&gb, s->gb.buffer, FFMIN(bytestream2_get_bytes_left(&s->gb), mode));
165
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 16971 times.
16971 if (ret < 0)
166 return ret;
167
168
2/2
✓ Branch 0 taken 101826 times.
✓ Branch 1 taken 16971 times.
118797 for (i = 0; i < 6; i++)
169 101826 tgq_decode_block(s, s->block[i], &gb);
170 16971 tgq_idct_put_mb(s, s->block, frame, mb_x, mb_y);
171 16971 bytestream2_skip(&s->gb, mode);
172 } else {
173
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 8418 times.
8418 if (mode == 3) {
174 memset(dc, bytestream2_get_byte(&s->gb), 4);
175 dc[4] = bytestream2_get_byte(&s->gb);
176 dc[5] = bytestream2_get_byte(&s->gb);
177
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 8418 times.
8418 } else if (mode == 6) {
178 bytestream2_get_buffer(&s->gb, dc, 6);
179
1/2
✓ Branch 0 taken 8418 times.
✗ Branch 1 not taken.
8418 } else if (mode == 12) {
180
2/2
✓ Branch 0 taken 50508 times.
✓ Branch 1 taken 8418 times.
58926 for (i = 0; i < 6; i++) {
181 50508 dc[i] = bytestream2_get_byte(&s->gb);
182 50508 bytestream2_skip(&s->gb, 1);
183 }
184 } else {
185 av_log(s->avctx, AV_LOG_ERROR, "unsupported mb mode %i\n", mode);
186 return -1;
187 }
188 8418 tgq_idct_put_mb_dconly(s, frame, mb_x, mb_y, dc);
189 }
190 25389 return 0;
191 }
192
193 279 static void tgq_calculate_qtable(TgqContext *s, int quant)
194 {
195 int i, j;
196 279 const int a = (14 * (100 - quant)) / 100 + 1;
197 279 const int b = (11 * (100 - quant)) / 100 + 4;
198
2/2
✓ Branch 0 taken 2232 times.
✓ Branch 1 taken 279 times.
2511 for (j = 0; j < 8; j++)
199
2/2
✓ Branch 0 taken 17856 times.
✓ Branch 1 taken 2232 times.
20088 for (i = 0; i < 8; i++)
200 17856 s->qtable[j * 8 + i] = ((a * (j + i) / (7 + 7) + b) *
201 17856 ff_inv_aanscales[j * 8 + i]) >> (14 - 4);
202 279 }
203
204 279 static int tgq_decode_frame(AVCodecContext *avctx, AVFrame *frame,
205 int *got_frame, 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 int x, y, ret;
211 int big_endian;
212
213
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 279 times.
279 if (buf_size < 16) {
214 av_log(avctx, AV_LOG_WARNING, "truncated header\n");
215 return AVERROR_INVALIDDATA;
216 }
217 279 big_endian = AV_RL32(&buf[4]) > 0x000FFFFF;
218 279 bytestream2_init(&s->gb, buf + 8, buf_size - 8);
219
1/2
✓ Branch 0 taken 279 times.
✗ Branch 1 not taken.
279 if (big_endian) {
220 279 s->width = bytestream2_get_be16u(&s->gb);
221 279 s->height = bytestream2_get_be16u(&s->gb);
222 } else {
223 s->width = bytestream2_get_le16u(&s->gb);
224 s->height = bytestream2_get_le16u(&s->gb);
225 }
226
227 279 ret = ff_set_dimensions(s->avctx, s->width, s->height);
228
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 279 times.
279 if (ret < 0)
229 return ret;
230
231 279 tgq_calculate_qtable(s, bytestream2_get_byteu(&s->gb));
232 279 bytestream2_skip(&s->gb, 3);
233
234
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 279 times.
279 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
235 return ret;
236 279 frame->key_frame = 1;
237 279 frame->pict_type = AV_PICTURE_TYPE_I;
238
239
2/2
✓ Branch 0 taken 1953 times.
✓ Branch 1 taken 279 times.
2232 for (y = 0; y < FFALIGN(avctx->height, 16) >> 4; y++)
240
2/2
✓ Branch 0 taken 25389 times.
✓ Branch 1 taken 1953 times.
27342 for (x = 0; x < FFALIGN(avctx->width, 16) >> 4; x++)
241
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 25389 times.
25389 if (tgq_decode_mb(s, frame, y, x) < 0)
242 return AVERROR_INVALIDDATA;
243
244 279 *got_frame = 1;
245
246 279 return avpkt->size;
247 }
248
249 const FFCodec ff_eatgq_decoder = {
250 .p.name = "eatgq",
251 .p.long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGQ video"),
252 .p.type = AVMEDIA_TYPE_VIDEO,
253 .p.id = AV_CODEC_ID_TGQ,
254 .priv_data_size = sizeof(TgqContext),
255 .init = tgq_decode_init,
256 FF_CODEC_DECODE_CB(tgq_decode_frame),
257 .p.capabilities = AV_CODEC_CAP_DR1,
258 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
259 };
260