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
tgq_decode_init(AVCodecContext *avctx)53 static av_cold int tgq_decode_init(AVCodecContext *avctx)
54 {
55 TgqContext *s = avctx->priv_data;
56 uint8_t idct_permutation[64];
57 s->avctx = avctx;
58 ff_init_scantable_permutation(idct_permutation, FF_IDCT_PERM_NONE);
59 ff_init_scantable(idct_permutation, &s->scantable, ff_zigzag_direct);
60 avctx->framerate = (AVRational){ 15, 1 };
61 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
62 return 0;
63 }
64
tgq_decode_block(TgqContext *s, int16_t block[64], GetBitContext *gb)65 static int tgq_decode_block(TgqContext *s, int16_t block[64], GetBitContext *gb)
66 {
67 uint8_t *perm = s->scantable.permutated;
68 int i, j, value;
69 block[0] = get_sbits(gb, 8) * s->qtable[0];
70 for (i = 1; i < 64;) {
71 switch (show_bits(gb, 3)) {
72 case 4:
73 if (i >= 63)
74 return AVERROR_INVALIDDATA;
75 block[perm[i++]] = 0;
76 case 0:
77 block[perm[i++]] = 0;
78 skip_bits(gb, 3);
79 break;
80 case 5:
81 case 1:
82 skip_bits(gb, 2);
83 value = get_bits(gb, 6);
84 if (value > 64 - i)
85 return AVERROR_INVALIDDATA;
86 for (j = 0; j < value; j++)
87 block[perm[i++]] = 0;
88 break;
89 case 6:
90 skip_bits(gb, 3);
91 block[perm[i]] = -s->qtable[perm[i]];
92 i++;
93 break;
94 case 2:
95 skip_bits(gb, 3);
96 block[perm[i]] = s->qtable[perm[i]];
97 i++;
98 break;
99 case 7: // 111b
100 case 3: // 011b
101 skip_bits(gb, 2);
102 if (show_bits(gb, 6) == 0x3F) {
103 skip_bits(gb, 6);
104 block[perm[i]] = get_sbits(gb, 8) * s->qtable[perm[i]];
105 } else {
106 block[perm[i]] = get_sbits(gb, 6) * s->qtable[perm[i]];
107 }
108 i++;
109 break;
110 }
111 }
112 block[0] += 128 << 4;
113 return 0;
114 }
115
tgq_idct_put_mb(TgqContext *s, int16_t (*block)[64], AVFrame *frame, int mb_x, int mb_y)116 static void tgq_idct_put_mb(TgqContext *s, int16_t (*block)[64], AVFrame *frame,
117 int mb_x, int mb_y)
118 {
119 ptrdiff_t linesize = frame->linesize[0];
120 uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16;
121 uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
122 uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
123
124 ff_ea_idct_put_c(dest_y , linesize, block[0]);
125 ff_ea_idct_put_c(dest_y + 8, linesize, block[1]);
126 ff_ea_idct_put_c(dest_y + 8 * linesize , linesize, block[2]);
127 ff_ea_idct_put_c(dest_y + 8 * linesize + 8, linesize, block[3]);
128 if (!(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {
129 ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
130 ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);
131 }
132 }
133
tgq_dconly(TgqContext *s, unsigned char *dst, ptrdiff_t dst_stride, int dc)134 static inline void tgq_dconly(TgqContext *s, unsigned char *dst,
135 ptrdiff_t dst_stride, int dc)
136 {
137 int level = av_clip_uint8((dc*s->qtable[0] + 2056) >> 4);
138 int j;
139 for (j = 0; j < 8; j++)
140 memset(dst + j * dst_stride, level, 8);
141 }
142
tgq_idct_put_mb_dconly(TgqContext *s, AVFrame *frame, int mb_x, int mb_y, const int8_t *dc)143 static void tgq_idct_put_mb_dconly(TgqContext *s, AVFrame *frame,
144 int mb_x, int mb_y, const int8_t *dc)
145 {
146 ptrdiff_t linesize = frame->linesize[0];
147 uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16;
148 uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
149 uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
150 tgq_dconly(s, dest_y, linesize, dc[0]);
151 tgq_dconly(s, dest_y + 8, linesize, dc[1]);
152 tgq_dconly(s, dest_y + 8 * linesize, linesize, dc[2]);
153 tgq_dconly(s, dest_y + 8 * linesize + 8, linesize, dc[3]);
154 if (!(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {
155 tgq_dconly(s, dest_cb, frame->linesize[1], dc[4]);
156 tgq_dconly(s, dest_cr, frame->linesize[2], dc[5]);
157 }
158 }
159
tgq_decode_mb(TgqContext *s, AVFrame *frame, int mb_y, int mb_x)160 static int tgq_decode_mb(TgqContext *s, AVFrame *frame, int mb_y, int mb_x)
161 {
162 int mode;
163 int i;
164 int8_t dc[6];
165
166 mode = bytestream2_get_byte(&s->gb);
167 if (mode > 12) {
168 GetBitContext gb;
169 int ret = init_get_bits8(&gb, s->gb.buffer, FFMIN(bytestream2_get_bytes_left(&s->gb), mode));
170 if (ret < 0)
171 return ret;
172
173 for (i = 0; i < 6; i++) {
174 int ret = tgq_decode_block(s, s->block[i], &gb);
175 if (ret < 0)
176 return ret;
177 }
178 tgq_idct_put_mb(s, s->block, frame, mb_x, mb_y);
179 bytestream2_skip(&s->gb, mode);
180 } else {
181 if (mode == 3) {
182 memset(dc, bytestream2_get_byte(&s->gb), 4);
183 dc[4] = bytestream2_get_byte(&s->gb);
184 dc[5] = bytestream2_get_byte(&s->gb);
185 } else if (mode == 6) {
186 bytestream2_get_buffer(&s->gb, dc, 6);
187 } else if (mode == 12) {
188 for (i = 0; i < 6; i++) {
189 dc[i] = bytestream2_get_byte(&s->gb);
190 bytestream2_skip(&s->gb, 1);
191 }
192 } else {
193 av_log(s->avctx, AV_LOG_ERROR, "unsupported mb mode %i\n", mode);
194 return -1;
195 }
196 tgq_idct_put_mb_dconly(s, frame, mb_x, mb_y, dc);
197 }
198 return 0;
199 }
200
tgq_calculate_qtable(TgqContext *s, int quant)201 static void tgq_calculate_qtable(TgqContext *s, int quant)
202 {
203 int i, j;
204 const int a = (14 * (100 - quant)) / 100 + 1;
205 const int b = (11 * (100 - quant)) / 100 + 4;
206 for (j = 0; j < 8; j++)
207 for (i = 0; i < 8; i++)
208 s->qtable[j * 8 + i] = ((a * (j + i) / (7 + 7) + b) *
209 ff_inv_aanscales[j * 8 + i]) >> (14 - 4);
210 }
211
tgq_decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *avpkt)212 static int tgq_decode_frame(AVCodecContext *avctx, AVFrame *frame,
213 int *got_frame, AVPacket *avpkt)
214 {
215 const uint8_t *buf = avpkt->data;
216 int buf_size = avpkt->size;
217 TgqContext *s = avctx->priv_data;
218 int x, y, ret;
219 int big_endian;
220
221 if (buf_size < 16) {
222 av_log(avctx, AV_LOG_WARNING, "truncated header\n");
223 return AVERROR_INVALIDDATA;
224 }
225 big_endian = AV_RL32(&buf[4]) > 0x000FFFFF;
226 bytestream2_init(&s->gb, buf + 8, buf_size - 8);
227 if (big_endian) {
228 s->width = bytestream2_get_be16u(&s->gb);
229 s->height = bytestream2_get_be16u(&s->gb);
230 } else {
231 s->width = bytestream2_get_le16u(&s->gb);
232 s->height = bytestream2_get_le16u(&s->gb);
233 }
234
235 ret = ff_set_dimensions(s->avctx, s->width, s->height);
236 if (ret < 0)
237 return ret;
238
239 tgq_calculate_qtable(s, bytestream2_get_byteu(&s->gb));
240 bytestream2_skip(&s->gb, 3);
241
242 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
243 return ret;
244 frame->key_frame = 1;
245 frame->pict_type = AV_PICTURE_TYPE_I;
246
247 for (y = 0; y < FFALIGN(avctx->height, 16) >> 4; y++)
248 for (x = 0; x < FFALIGN(avctx->width, 16) >> 4; x++)
249 if (tgq_decode_mb(s, frame, y, x) < 0)
250 return AVERROR_INVALIDDATA;
251
252 *got_frame = 1;
253
254 return avpkt->size;
255 }
256
257 const FFCodec ff_eatgq_decoder = {
258 .p.name = "eatgq",
259 .p.long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGQ video"),
260 .p.type = AVMEDIA_TYPE_VIDEO,
261 .p.id = AV_CODEC_ID_TGQ,
262 .priv_data_size = sizeof(TgqContext),
263 .init = tgq_decode_init,
264 FF_CODEC_DECODE_CB(tgq_decode_frame),
265 .p.capabilities = AV_CODEC_CAP_DR1,
266 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
267 };
268