FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/eatgq.c
Date: 2021-09-22 05:58:22
Exec Total Coverage
Lines: 124 138 89.9%
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
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1565353 for (i = 1; i < 64;) {
70
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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
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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
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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 }
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
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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
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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
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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
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25389 if (mode > 12) {
162 GetBitContext gb;
163
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16971 int ret = init_get_bits8(&gb, s->gb.buffer, FFMIN(bytestream2_get_bytes_left(&s->gb), mode));
164
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16971 if (ret < 0)
165 return ret;
166
167
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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
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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
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8418 } else if (mode == 6) {
177 bytestream2_get_buffer(&s->gb, dc, 6);
178
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8418 } else if (mode == 12) {
179
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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
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2511 for (j = 0; j < 8; j++)
198
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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
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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
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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
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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
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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
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2232 for (y = 0; y < FFALIGN(avctx->height, 16) >> 4; y++)
241
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27342 for (x = 0; x < FFALIGN(avctx->width, 16) >> 4; x++)
242
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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 const 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 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
260 };
261