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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 | #include "avcodec.h" | |
32 | #define BITSTREAM_READER_LE | |
33 | #include "get_bits.h" | |
34 | #include "bytestream.h" | |
35 | #include "idctdsp.h" | |
36 | #include "aandcttab.h" | |
37 | #include "eaidct.h" | |
38 | #include "internal.h" | |
39 | ||
40 | typedef struct TgqContext { | |
41 | AVCodecContext *avctx; | |
42 | int width, height; | |
43 | ScanTable scantable; | |
44 | int qtable[64]; | |
45 | DECLARE_ALIGNED(16, int16_t, block)[6][64]; | |
46 | GetByteContext gb; | |
47 | } TgqContext; | |
48 | ||
49 | static av_cold int tgq_decode_init(AVCodecContext *avctx) | |
50 | { | |
51 | TgqContext *s = avctx->priv_data; | |
52 | uint8_t idct_permutation[64]; | |
53 | s->avctx = avctx; | |
54 | ff_init_scantable_permutation(idct_permutation, FF_IDCT_PERM_NONE); | |
55 | ff_init_scantable(idct_permutation, &s->scantable, ff_zigzag_direct); | |
f6fa7814 | 56 | avctx->framerate = (AVRational){ 15, 1 }; |
2ba45a60 DM |
57 | avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
58 | return 0; | |
59 | } | |
60 | ||
61 | static void tgq_decode_block(TgqContext *s, int16_t block[64], GetBitContext *gb) | |
62 | { | |
63 | uint8_t *perm = s->scantable.permutated; | |
64 | int i, j, value; | |
65 | block[0] = get_sbits(gb, 8) * s->qtable[0]; | |
66 | for (i = 1; i < 64;) { | |
67 | switch (show_bits(gb, 3)) { | |
68 | case 4: | |
69 | block[perm[i++]] = 0; | |
70 | case 0: | |
71 | block[perm[i++]] = 0; | |
72 | skip_bits(gb, 3); | |
73 | break; | |
74 | case 5: | |
75 | case 1: | |
76 | skip_bits(gb, 2); | |
77 | value = get_bits(gb, 6); | |
78 | for (j = 0; j < value; j++) | |
79 | block[perm[i++]] = 0; | |
80 | break; | |
81 | case 6: | |
82 | skip_bits(gb, 3); | |
83 | block[perm[i]] = -s->qtable[perm[i]]; | |
84 | i++; | |
85 | break; | |
86 | case 2: | |
87 | skip_bits(gb, 3); | |
88 | block[perm[i]] = s->qtable[perm[i]]; | |
89 | i++; | |
90 | break; | |
91 | case 7: // 111b | |
92 | case 3: // 011b | |
93 | skip_bits(gb, 2); | |
94 | if (show_bits(gb, 6) == 0x3F) { | |
95 | skip_bits(gb, 6); | |
96 | block[perm[i]] = get_sbits(gb, 8) * s->qtable[perm[i]]; | |
97 | } else { | |
98 | block[perm[i]] = get_sbits(gb, 6) * s->qtable[perm[i]]; | |
99 | } | |
100 | i++; | |
101 | break; | |
102 | } | |
103 | } | |
104 | block[0] += 128 << 4; | |
105 | } | |
106 | ||
107 | static void tgq_idct_put_mb(TgqContext *s, int16_t (*block)[64], AVFrame *frame, | |
108 | int mb_x, int mb_y) | |
109 | { | |
110 | int linesize = frame->linesize[0]; | |
111 | uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16; | |
112 | uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8; | |
113 | uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8; | |
114 | ||
115 | ff_ea_idct_put_c(dest_y , linesize, block[0]); | |
116 | ff_ea_idct_put_c(dest_y + 8, linesize, block[1]); | |
117 | ff_ea_idct_put_c(dest_y + 8 * linesize , linesize, block[2]); | |
118 | ff_ea_idct_put_c(dest_y + 8 * linesize + 8, linesize, block[3]); | |
119 | if (!(s->avctx->flags & CODEC_FLAG_GRAY)) { | |
120 | ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]); | |
121 | ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]); | |
122 | } | |
123 | } | |
124 | ||
125 | static inline void tgq_dconly(TgqContext *s, unsigned char *dst, | |
126 | int dst_stride, int dc) | |
127 | { | |
128 | int level = av_clip_uint8((dc*s->qtable[0] + 2056) >> 4); | |
129 | int j; | |
130 | for (j = 0; j < 8; j++) | |
131 | memset(dst + j * dst_stride, level, 8); | |
132 | } | |
133 | ||
134 | static void tgq_idct_put_mb_dconly(TgqContext *s, AVFrame *frame, | |
135 | int mb_x, int mb_y, const int8_t *dc) | |
136 | { | |
137 | int linesize = frame->linesize[0]; | |
138 | uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16; | |
139 | uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8; | |
140 | uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8; | |
141 | tgq_dconly(s, dest_y, linesize, dc[0]); | |
142 | tgq_dconly(s, dest_y + 8, linesize, dc[1]); | |
143 | tgq_dconly(s, dest_y + 8 * linesize, linesize, dc[2]); | |
144 | tgq_dconly(s, dest_y + 8 * linesize + 8, linesize, dc[3]); | |
145 | if (!(s->avctx->flags & CODEC_FLAG_GRAY)) { | |
146 | tgq_dconly(s, dest_cb, frame->linesize[1], dc[4]); | |
147 | tgq_dconly(s, dest_cr, frame->linesize[2], dc[5]); | |
148 | } | |
149 | } | |
150 | ||
151 | static int tgq_decode_mb(TgqContext *s, AVFrame *frame, int mb_y, int mb_x) | |
152 | { | |
153 | int mode; | |
154 | int i; | |
155 | int8_t dc[6]; | |
156 | ||
157 | mode = bytestream2_get_byte(&s->gb); | |
158 | if (mode > 12) { | |
159 | GetBitContext gb; | |
160 | init_get_bits8(&gb, s->gb.buffer, FFMIN(bytestream2_get_bytes_left(&s->gb), mode)); | |
161 | for (i = 0; i < 6; i++) | |
162 | tgq_decode_block(s, s->block[i], &gb); | |
163 | tgq_idct_put_mb(s, s->block, frame, mb_x, mb_y); | |
164 | bytestream2_skip(&s->gb, mode); | |
165 | } else { | |
166 | if (mode == 3) { | |
167 | memset(dc, bytestream2_get_byte(&s->gb), 4); | |
168 | dc[4] = bytestream2_get_byte(&s->gb); | |
169 | dc[5] = bytestream2_get_byte(&s->gb); | |
170 | } else if (mode == 6) { | |
171 | bytestream2_get_buffer(&s->gb, dc, 6); | |
172 | } else if (mode == 12) { | |
173 | for (i = 0; i < 6; i++) { | |
174 | dc[i] = bytestream2_get_byte(&s->gb); | |
175 | bytestream2_skip(&s->gb, 1); | |
176 | } | |
177 | } else { | |
178 | av_log(s->avctx, AV_LOG_ERROR, "unsupported mb mode %i\n", mode); | |
179 | return -1; | |
180 | } | |
181 | tgq_idct_put_mb_dconly(s, frame, mb_x, mb_y, dc); | |
182 | } | |
183 | return 0; | |
184 | } | |
185 | ||
186 | static void tgq_calculate_qtable(TgqContext *s, int quant) | |
187 | { | |
188 | int i, j; | |
189 | const int a = (14 * (100 - quant)) / 100 + 1; | |
190 | const int b = (11 * (100 - quant)) / 100 + 4; | |
191 | for (j = 0; j < 8; j++) | |
192 | for (i = 0; i < 8; i++) | |
193 | s->qtable[j * 8 + i] = ((a * (j + i) / (7 + 7) + b) * | |
194 | ff_inv_aanscales[j * 8 + i]) >> (14 - 4); | |
195 | } | |
196 | ||
197 | static int tgq_decode_frame(AVCodecContext *avctx, | |
198 | void *data, int *got_frame, | |
199 | AVPacket *avpkt) | |
200 | { | |
201 | const uint8_t *buf = avpkt->data; | |
202 | int buf_size = avpkt->size; | |
203 | TgqContext *s = avctx->priv_data; | |
204 | AVFrame *frame = data; | |
205 | int x, y, ret; | |
206 | int big_endian; | |
207 | ||
208 | if (buf_size < 16) { | |
209 | av_log(avctx, AV_LOG_WARNING, "truncated header\n"); | |
210 | return AVERROR_INVALIDDATA; | |
211 | } | |
212 | big_endian = AV_RL32(&buf[4]) > 0x000FFFFF; | |
213 | bytestream2_init(&s->gb, buf + 8, buf_size - 8); | |
214 | if (big_endian) { | |
215 | s->width = bytestream2_get_be16u(&s->gb); | |
216 | s->height = bytestream2_get_be16u(&s->gb); | |
217 | } else { | |
218 | s->width = bytestream2_get_le16u(&s->gb); | |
219 | s->height = bytestream2_get_le16u(&s->gb); | |
220 | } | |
221 | ||
222 | ret = ff_set_dimensions(s->avctx, s->width, s->height); | |
223 | if (ret < 0) | |
224 | return ret; | |
225 | ||
226 | tgq_calculate_qtable(s, bytestream2_get_byteu(&s->gb)); | |
227 | bytestream2_skip(&s->gb, 3); | |
228 | ||
229 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) | |
230 | return ret; | |
231 | frame->key_frame = 1; | |
232 | frame->pict_type = AV_PICTURE_TYPE_I; | |
233 | ||
234 | for (y = 0; y < FFALIGN(avctx->height, 16) >> 4; y++) | |
235 | for (x = 0; x < FFALIGN(avctx->width, 16) >> 4; x++) | |
236 | if (tgq_decode_mb(s, frame, y, x) < 0) | |
237 | return AVERROR_INVALIDDATA; | |
238 | ||
239 | *got_frame = 1; | |
240 | ||
241 | return avpkt->size; | |
242 | } | |
243 | ||
244 | AVCodec ff_eatgq_decoder = { | |
245 | .name = "eatgq", | |
246 | .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGQ video"), | |
247 | .type = AVMEDIA_TYPE_VIDEO, | |
248 | .id = AV_CODEC_ID_TGQ, | |
249 | .priv_data_size = sizeof(TgqContext), | |
250 | .init = tgq_decode_init, | |
251 | .decode = tgq_decode_frame, | |
252 | .capabilities = CODEC_CAP_DR1, | |
253 | }; |