FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/eatgq.c
Date: 2024-04-26 14:42:52
Exec Total Coverage
Lines: 124 141 87.9%
Functions: 8 8 100.0%
Branches: 43 59 72.9%
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 "decode.h"
40 #include "eaidct.h"
41 #include "get_bits.h"
42
43 typedef struct TgqContext {
44 AVCodecContext *avctx;
45 int width, height;
46 int qtable[64];
47 DECLARE_ALIGNED(16, int16_t, block)[6][64];
48 } TgqContext;
49
50 2 static av_cold int tgq_decode_init(AVCodecContext *avctx)
51 {
52 2 TgqContext *s = avctx->priv_data;
53 2 s->avctx = avctx;
54 2 avctx->framerate = (AVRational){ 15, 1 };
55 2 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
56 2 return 0;
57 }
58
59 101826 static int tgq_decode_block(TgqContext *s, int16_t block[64], GetBitContext *gb)
60 {
61 101826 const uint8_t *scantable = ff_zigzag_direct;
62 int i, j, value;
63 101826 block[0] = get_sbits(gb, 8) * s->qtable[0];
64
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 1667179 for (i = 1; i < 64;) {
65
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 1463527 switch (show_bits(gb, 3)) {
66 152397 case 4:
67
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 152397 if (i >= 63)
68 ✗ return AVERROR_INVALIDDATA;
69 152397 block[scantable[i++]] = 0;
70 370656 case 0:
71 370656 block[scantable[i++]] = 0;
72 370656 skip_bits(gb, 3);
73 370656 break;
74 148778 case 5:
75 case 1:
76 148778 skip_bits(gb, 2);
77 148778 value = get_bits(gb, 6);
78
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 148778 if (value > 64 - i)
79 ✗ return AVERROR_INVALIDDATA;
80
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 5096670 for (j = 0; j < value; j++)
81 4947892 block[scantable[i++]] = 0;
82 148778 break;
83 333783 case 6:
84 333783 skip_bits(gb, 3);
85 333783 block[scantable[i]] = -s->qtable[scantable[i]];
86 333783 i++;
87 333783 break;
88 339292 case 2:
89 339292 skip_bits(gb, 3);
90 339292 block[scantable[i]] = s->qtable[scantable[i]];
91 339292 i++;
92 339292 break;
93 271018 case 7: // 111b
94 case 3: // 011b
95 271018 skip_bits(gb, 2);
96
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 271018 if (show_bits(gb, 6) == 0x3F) {
97 1440 skip_bits(gb, 6);
98 1440 block[scantable[i]] = get_sbits(gb, 8) * s->qtable[scantable[i]];
99 } else {
100 269578 block[scantable[i]] = get_sbits(gb, 6) * s->qtable[scantable[i]];
101 }
102 271018 i++;
103 271018 break;
104 }
105 }
106 101826 block[0] += 128 << 4;
107 101826 return 0;
108 }
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, GetByteContext *gbyte,
155 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(gbyte);
162
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 25389 if (mode > 12) {
163 GetBitContext gb;
164
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 16971 int ret = init_get_bits8(&gb, gbyte->buffer, FFMIN(bytestream2_get_bytes_left(gbyte), mode));
165
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 16971 if (ret < 0)
166 ✗ return ret;
167
168
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 118797 for (i = 0; i < 6; i++) {
169 101826 int ret = tgq_decode_block(s, s->block[i], &gb);
170
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 101826 if (ret < 0)
171 ✗ return ret;
172 }
173 16971 tgq_idct_put_mb(s, s->block, frame, mb_x, mb_y);
174 16971 bytestream2_skip(gbyte, mode);
175 } else {
176
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 8418 if (mode == 3) {
177 ✗ memset(dc, bytestream2_get_byte(gbyte), 4);
178 ✗ dc[4] = bytestream2_get_byte(gbyte);
179 ✗ dc[5] = bytestream2_get_byte(gbyte);
180
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 8418 } else if (mode == 6) {
181 ✗ bytestream2_get_buffer(gbyte, dc, 6);
182
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 8418 } else if (mode == 12) {
183
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 58926 for (i = 0; i < 6; i++) {
184 50508 dc[i] = bytestream2_get_byte(gbyte);
185 50508 bytestream2_skip(gbyte, 1);
186 }
187 } else {
188 ✗ av_log(s->avctx, AV_LOG_ERROR, "unsupported mb mode %i\n", mode);
189 ✗ return -1;
190 }
191 8418 tgq_idct_put_mb_dconly(s, frame, mb_x, mb_y, dc);
192 }
193 25389 return 0;
194 }
195
196 279 static void tgq_calculate_qtable(TgqContext *s, int quant)
197 {
198 int i, j;
199 279 const int a = (14 * (100 - quant)) / 100 + 1;
200 279 const int b = (11 * (100 - quant)) / 100 + 4;
201
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 2511 for (j = 0; j < 8; j++)
202
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 20088 for (i = 0; i < 8; i++)
203 17856 s->qtable[j * 8 + i] = ((a * (j + i) / (7 + 7) + b) *
204 17856 ff_inv_aanscales[j * 8 + i]) >> (14 - 4);
205 279 }
206
207 279 static int tgq_decode_frame(AVCodecContext *avctx, AVFrame *frame,
208 int *got_frame, AVPacket *avpkt)
209 {
210 279 const uint8_t *buf = avpkt->data;
211 279 int buf_size = avpkt->size;
212 279 TgqContext *s = avctx->priv_data;
213 GetByteContext gbyte;
214 int x, y, ret;
215 int big_endian;
216
217
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 279 if (buf_size < 16) {
218 ✗ av_log(avctx, AV_LOG_WARNING, "truncated header\n");
219 ✗ return AVERROR_INVALIDDATA;
220 }
221 279 big_endian = AV_RL32(&buf[4]) > 0x000FFFFF;
222 279 bytestream2_init(&gbyte, buf + 8, buf_size - 8);
223
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 279 if (big_endian) {
224 279 s->width = bytestream2_get_be16u(&gbyte);
225 279 s->height = bytestream2_get_be16u(&gbyte);
226 } else {
227 ✗ s->width = bytestream2_get_le16u(&gbyte);
228 ✗ s->height = bytestream2_get_le16u(&gbyte);
229 }
230
231 279 ret = ff_set_dimensions(s->avctx, s->width, s->height);
232
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 279 if (ret < 0)
233 ✗ return ret;
234
235 279 tgq_calculate_qtable(s, bytestream2_get_byteu(&gbyte));
236 279 bytestream2_skipu(&gbyte, 3);
237
238
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 279 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
239 ✗ return ret;
240 279 frame->flags |= AV_FRAME_FLAG_KEY;
241 279 frame->pict_type = AV_PICTURE_TYPE_I;
242
243
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 2232 for (y = 0; y < FFALIGN(avctx->height, 16) >> 4; y++)
244
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245
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 25389 if (tgq_decode_mb(s, &gbyte, frame, y, x) < 0)
246 ✗ return AVERROR_INVALIDDATA;
247
248 279 *got_frame = 1;
249
250 279 return avpkt->size;
251 }
252
253 const FFCodec ff_eatgq_decoder = {
254 .p.name = "eatgq",
255 CODEC_LONG_NAME("Electronic Arts TGQ video"),
256 .p.type = AVMEDIA_TYPE_VIDEO,
257 .p.id = AV_CODEC_ID_TGQ,
258 .priv_data_size = sizeof(TgqContext),
259 .init = tgq_decode_init,
260 FF_CODEC_DECODE_CB(tgq_decode_frame),
261 .p.capabilities = AV_CODEC_CAP_DR1,
262 };
263