a020c529926629bfb551747f7ca2d2f84fc0e165
[libav.git] / libavcodec / eatgq.c
1 /*
2 * Electronic Arts TGQ Video Decoder
3 * Copyright (c) 2007-2008 Peter Ross <pross@xvid.org>
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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 "dsputil.h"
36 #include "aandcttab.h"
37 #include "eaidct.h"
38 #include "internal.h"
39
40 typedef struct TgqContext {
41 AVCodecContext *avctx;
42 AVFrame frame;
43 int width, height;
44 ScanTable scantable;
45 int qtable[64];
46 DECLARE_ALIGNED(16, int16_t, block)[6][64];
47 GetByteContext gb;
48 } TgqContext;
49
50 static av_cold int tgq_decode_init(AVCodecContext *avctx)
51 {
52 TgqContext *s = avctx->priv_data;
53 uint8_t idct_permutation[64];
54 s->avctx = avctx;
55 ff_init_scantable_permutation(idct_permutation, FF_NO_IDCT_PERM);
56 ff_init_scantable(idct_permutation, &s->scantable, ff_zigzag_direct);
57 avctx->time_base = (AVRational){1, 15};
58 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
59 return 0;
60 }
61
62 static void tgq_decode_block(TgqContext *s, int16_t block[64], GetBitContext *gb)
63 {
64 uint8_t *perm = s->scantable.permutated;
65 int i, j, value;
66 block[0] = get_sbits(gb, 8) * s->qtable[0];
67 for (i = 1; i < 64;) {
68 switch (show_bits(gb, 3)) {
69 case 4:
70 block[perm[i++]] = 0;
71 case 0:
72 block[perm[i++]] = 0;
73 skip_bits(gb, 3);
74 break;
75 case 5:
76 case 1:
77 skip_bits(gb, 2);
78 value = get_bits(gb, 6);
79 for (j = 0; j < value; j++)
80 block[perm[i++]] = 0;
81 break;
82 case 6:
83 skip_bits(gb, 3);
84 block[perm[i]] = -s->qtable[perm[i]];
85 i++;
86 break;
87 case 2:
88 skip_bits(gb, 3);
89 block[perm[i]] = s->qtable[perm[i]];
90 i++;
91 break;
92 case 7: // 111b
93 case 3: // 011b
94 skip_bits(gb, 2);
95 if (show_bits(gb, 6) == 0x3F) {
96 skip_bits(gb, 6);
97 block[perm[i]] = get_sbits(gb, 8) * s->qtable[perm[i]];
98 } else {
99 block[perm[i]] = get_sbits(gb, 6) * s->qtable[perm[i]];
100 }
101 i++;
102 break;
103 }
104 }
105 block[0] += 128 << 4;
106 }
107
108 static void tgq_idct_put_mb(TgqContext *s, int16_t (*block)[64],
109 int mb_x, int mb_y)
110 {
111 int linesize = s->frame.linesize[0];
112 uint8_t *dest_y = s->frame.data[0] + (mb_y * 16 * linesize) + mb_x * 16;
113 uint8_t *dest_cb = s->frame.data[1] + (mb_y * 8 * s->frame.linesize[1]) + mb_x * 8;
114 uint8_t *dest_cr = s->frame.data[2] + (mb_y * 8 * s->frame.linesize[2]) + mb_x * 8;
115
116 ff_ea_idct_put_c(dest_y , linesize, block[0]);
117 ff_ea_idct_put_c(dest_y + 8, linesize, block[1]);
118 ff_ea_idct_put_c(dest_y + 8 * linesize , linesize, block[2]);
119 ff_ea_idct_put_c(dest_y + 8 * linesize + 8, linesize, block[3]);
120 if (!(s->avctx->flags & CODEC_FLAG_GRAY)) {
121 ff_ea_idct_put_c(dest_cb, s->frame.linesize[1], block[4]);
122 ff_ea_idct_put_c(dest_cr, s->frame.linesize[2], block[5]);
123 }
124 }
125
126 static inline void tgq_dconly(TgqContext *s, unsigned char *dst,
127 int dst_stride, int dc)
128 {
129 int level = av_clip_uint8((dc*s->qtable[0] + 2056) >> 4);
130 int j;
131 for (j = 0; j < 8; j++)
132 memset(dst + j * dst_stride, level, 8);
133 }
134
135 static void tgq_idct_put_mb_dconly(TgqContext *s, int mb_x, int mb_y, const int8_t *dc)
136 {
137 int linesize = s->frame.linesize[0];
138 uint8_t *dest_y = s->frame.data[0] + (mb_y * 16 * linesize) + mb_x * 16;
139 uint8_t *dest_cb = s->frame.data[1] + (mb_y * 8 * s->frame.linesize[1]) + mb_x * 8;
140 uint8_t *dest_cr = s->frame.data[2] + (mb_y * 8 * s->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, s->frame.linesize[1], dc[4]);
147 tgq_dconly(s, dest_cr, s->frame.linesize[2], dc[5]);
148 }
149 }
150
151 static void tgq_decode_mb(TgqContext *s, 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_bits(&gb, s->gb.buffer, FFMIN(s->gb.buffer_end - s->gb.buffer, mode) * 8);
161 for (i = 0; i < 6; i++)
162 tgq_decode_block(s, s->block[i], &gb);
163 tgq_idct_put_mb(s, s->block, 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 }
180 tgq_idct_put_mb_dconly(s, mb_x, mb_y, dc);
181 }
182 }
183
184 static void tgq_calculate_qtable(TgqContext *s, int quant)
185 {
186 int i, j;
187 const int a = (14 * (100 - quant)) / 100 + 1;
188 const int b = (11 * (100 - quant)) / 100 + 4;
189 for (j = 0; j < 8; j++)
190 for (i = 0; i < 8; i++)
191 s->qtable[j * 8 + i] = ((a * (j + i) / (7 + 7) + b) *
192 ff_inv_aanscales[j * 8 + i]) >> (14 - 4);
193 }
194
195 static int tgq_decode_frame(AVCodecContext *avctx,
196 void *data, int *got_frame,
197 AVPacket *avpkt)
198 {
199 const uint8_t *buf = avpkt->data;
200 int buf_size = avpkt->size;
201 TgqContext *s = avctx->priv_data;
202 int x, y, ret;
203 int big_endian = AV_RL32(&buf[4]) > 0x000FFFFF;
204
205 if (buf_size < 16) {
206 av_log(avctx, AV_LOG_WARNING, "truncated header\n");
207 return AVERROR_INVALIDDATA;
208 }
209 bytestream2_init(&s->gb, buf + 8, buf_size - 8);
210 if (big_endian) {
211 s->width = bytestream2_get_be16u(&s->gb);
212 s->height = bytestream2_get_be16u(&s->gb);
213 } else {
214 s->width = bytestream2_get_le16u(&s->gb);
215 s->height = bytestream2_get_le16u(&s->gb);
216 }
217
218 if (s->avctx->width!=s->width || s->avctx->height!=s->height) {
219 avcodec_set_dimensions(s->avctx, s->width, s->height);
220 if (s->frame.data[0])
221 avctx->release_buffer(avctx, &s->frame);
222 }
223 tgq_calculate_qtable(s, bytestream2_get_byteu(&s->gb));
224 bytestream2_skip(&s->gb, 3);
225
226 if (!s->frame.data[0]) {
227 s->frame.key_frame = 1;
228 s->frame.pict_type = AV_PICTURE_TYPE_I;
229 s->frame.buffer_hints = FF_BUFFER_HINTS_VALID;
230 if ((ret = ff_get_buffer(avctx, &s->frame)) < 0) {
231 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
232 return ret;
233 }
234 }
235
236 for (y = 0; y < FFALIGN(avctx->height, 16) >> 4; y++)
237 for (x = 0; x < FFALIGN(avctx->width, 16) >> 4; x++)
238 tgq_decode_mb(s, y, x);
239
240 *got_frame = 1;
241 *(AVFrame*)data = s->frame;
242
243 return avpkt->size;
244 }
245
246 static av_cold int tgq_decode_end(AVCodecContext *avctx)
247 {
248 TgqContext *s = avctx->priv_data;
249 if (s->frame.data[0])
250 s->avctx->release_buffer(avctx, &s->frame);
251 return 0;
252 }
253
254 AVCodec ff_eatgq_decoder = {
255 .name = "eatgq",
256 .type = AVMEDIA_TYPE_VIDEO,
257 .id = AV_CODEC_ID_TGQ,
258 .priv_data_size = sizeof(TgqContext),
259 .init = tgq_decode_init,
260 .close = tgq_decode_end,
261 .decode = tgq_decode_frame,
262 .capabilities = CODEC_CAP_DR1,
263 .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGQ video"),
264 };