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path: root/libavcodec/eatgq.c (plain)
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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#define BITSTREAM_READER_LE
32#include "aandcttab.h"
33#include "avcodec.h"
34#include "bytestream.h"
35#include "eaidct.h"
36#include "get_bits.h"
37#include "idctdsp.h"
38#include "internal.h"
39
40typedef 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
49static 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);
56 avctx->framerate = (AVRational){ 15, 1 };
57 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
58 return 0;
59}
60
61static 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
107static void tgq_idct_put_mb(TgqContext *s, int16_t (*block)[64], AVFrame *frame,
108 int mb_x, int mb_y)
109{
110 ptrdiff_t 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 & AV_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
125static inline void tgq_dconly(TgqContext *s, unsigned char *dst,
126 ptrdiff_t 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
134static void tgq_idct_put_mb_dconly(TgqContext *s, AVFrame *frame,
135 int mb_x, int mb_y, const int8_t *dc)
136{
137 ptrdiff_t 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 & AV_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
151static 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 int ret = init_get_bits8(&gb, s->gb.buffer, FFMIN(bytestream2_get_bytes_left(&s->gb), mode));
161 if (ret < 0)
162 return ret;
163
164 for (i = 0; i < 6; i++)
165 tgq_decode_block(s, s->block[i], &gb);
166 tgq_idct_put_mb(s, s->block, frame, mb_x, mb_y);
167 bytestream2_skip(&s->gb, mode);
168 } else {
169 if (mode == 3) {
170 memset(dc, bytestream2_get_byte(&s->gb), 4);
171 dc[4] = bytestream2_get_byte(&s->gb);
172 dc[5] = bytestream2_get_byte(&s->gb);
173 } else if (mode == 6) {
174 bytestream2_get_buffer(&s->gb, dc, 6);
175 } else if (mode == 12) {
176 for (i = 0; i < 6; i++) {
177 dc[i] = bytestream2_get_byte(&s->gb);
178 bytestream2_skip(&s->gb, 1);
179 }
180 } else {
181 av_log(s->avctx, AV_LOG_ERROR, "unsupported mb mode %i\n", mode);
182 return -1;
183 }
184 tgq_idct_put_mb_dconly(s, frame, mb_x, mb_y, dc);
185 }
186 return 0;
187}
188
189static void tgq_calculate_qtable(TgqContext *s, int quant)
190{
191 int i, j;
192 const int a = (14 * (100 - quant)) / 100 + 1;
193 const int b = (11 * (100 - quant)) / 100 + 4;
194 for (j = 0; j < 8; j++)
195 for (i = 0; i < 8; i++)
196 s->qtable[j * 8 + i] = ((a * (j + i) / (7 + 7) + b) *
197 ff_inv_aanscales[j * 8 + i]) >> (14 - 4);
198}
199
200static int tgq_decode_frame(AVCodecContext *avctx,
201 void *data, int *got_frame,
202 AVPacket *avpkt)
203{
204 const uint8_t *buf = avpkt->data;
205 int buf_size = avpkt->size;
206 TgqContext *s = avctx->priv_data;
207 AVFrame *frame = data;
208 int x, y, ret;
209 int big_endian;
210
211 if (buf_size < 16) {
212 av_log(avctx, AV_LOG_WARNING, "truncated header\n");
213 return AVERROR_INVALIDDATA;
214 }
215 big_endian = AV_RL32(&buf[4]) > 0x000FFFFF;
216 bytestream2_init(&s->gb, buf + 8, buf_size - 8);
217 if (big_endian) {
218 s->width = bytestream2_get_be16u(&s->gb);
219 s->height = bytestream2_get_be16u(&s->gb);
220 } else {
221 s->width = bytestream2_get_le16u(&s->gb);
222 s->height = bytestream2_get_le16u(&s->gb);
223 }
224
225 ret = ff_set_dimensions(s->avctx, s->width, s->height);
226 if (ret < 0)
227 return ret;
228
229 tgq_calculate_qtable(s, bytestream2_get_byteu(&s->gb));
230 bytestream2_skip(&s->gb, 3);
231
232 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
233 return ret;
234 frame->key_frame = 1;
235 frame->pict_type = AV_PICTURE_TYPE_I;
236
237 for (y = 0; y < FFALIGN(avctx->height, 16) >> 4; y++)
238 for (x = 0; x < FFALIGN(avctx->width, 16) >> 4; x++)
239 if (tgq_decode_mb(s, frame, y, x) < 0)
240 return AVERROR_INVALIDDATA;
241
242 *got_frame = 1;
243
244 return avpkt->size;
245}
246
247AVCodec ff_eatgq_decoder = {
248 .name = "eatgq",
249 .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGQ video"),
250 .type = AVMEDIA_TYPE_VIDEO,
251 .id = AV_CODEC_ID_TGQ,
252 .priv_data_size = sizeof(TgqContext),
253 .init = tgq_decode_init,
254 .decode = tgq_decode_frame,
255 .capabilities = AV_CODEC_CAP_DR1,
256};
257
generated by cgit at 2024-05-17 06:32:50 (GMT)