1 /*
2 * Copyright (C) 2003 The FFmpeg project
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 /**
22 * @file
23 * id RoQ Video Decoder by Dr. Tim Ferguson
24 * For more information about the id RoQ format, visit:
25 * http://www.csse.monash.edu.au/~timf/
26 */
27
30
35
37 {
38 unsigned int chunk_id = 0, chunk_arg = 0;
39 unsigned long chunk_size = 0;
40 int i, j, k, nv1, nv2, vqflg = 0, vqflg_pos = -1;
41 int vqid, xpos, ypos, xp, yp, x, y, mx, my;
44
46 chunk_id = bytestream2_get_le16(gb);
47 chunk_size = bytestream2_get_le32(gb);
48 chunk_arg = bytestream2_get_le16(gb);
49
51 break;
53 if((nv1 = chunk_arg >> 8) == 0)
54 nv1 = 256;
55 if((nv2 = chunk_arg & 0xff) == 0 && nv1 * 6 < chunk_size)
56 nv2 = 256;
57 for(
i = 0;
i < nv1;
i++) {
58 ri->
cb2x2[
i].
y[0] = bytestream2_get_byte(gb);
59 ri->
cb2x2[
i].
y[1] = bytestream2_get_byte(gb);
60 ri->
cb2x2[
i].
y[2] = bytestream2_get_byte(gb);
61 ri->
cb2x2[
i].
y[3] = bytestream2_get_byte(gb);
62 ri->
cb2x2[
i].
u = bytestream2_get_byte(gb);
63 ri->
cb2x2[
i].
v = bytestream2_get_byte(gb);
64 }
65 for(
i = 0;
i < nv2;
i++)
66 for(j = 0; j < 4; j++)
67 ri->
cb4x4[
i].
idx[j] = bytestream2_get_byte(gb);
68 }
69 }
70
72 xpos = ypos = 0;
73
77 }
78
80 for (yp = ypos; yp < ypos + 16; yp += 8)
81 for (xp = xpos; xp < xpos + 16; xp += 8) {
84 return;
85 }
86 if (vqflg_pos < 0) {
87 vqflg = bytestream2_get_le16(gb);
88 vqflg_pos = 7;
89 }
90 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
91 vqflg_pos--;
92
93 switch(vqid) {
95 break;
97 int byte = bytestream2_get_byte(gb);
98 mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8));
99 my = 8 - (byte & 0xf) - ((signed char) chunk_arg);
101 break;
102 }
104 qcell = ri->
cb4x4 + bytestream2_get_byte(gb);
109 break;
111 for (k = 0; k < 4; k++) {
112 x = xp; y = yp;
113 if(k & 0x01) x += 4;
114 if(k & 0x02) y += 4;
115
118 return;
119 }
120 if (vqflg_pos < 0) {
121 vqflg = bytestream2_get_le16(gb);
122 vqflg_pos = 7;
123 }
124 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
125 vqflg_pos--;
126 switch(vqid) {
128 break;
130 int byte = bytestream2_get_byte(gb);
131 mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8));
132 my = 8 - (byte & 0xf) - ((signed char) chunk_arg);
134 break;
135 }
137 qcell = ri->
cb4x4 + bytestream2_get_byte(gb);
142 break;
148 break;
149 }
150 }
151 break;
152 default:
154 }
155 }
156
157 xpos += 16;
158 if (xpos >= ri->
width) {
160 ypos += 16;
161 }
163 break;
164 }
165 }
166
167
169 {
171
173
177 }
178
181
184 if (!
s->current_frame || !
s->last_frame)
186
189
190 return 0;
191 }
192
194 void *
data,
int *got_frame,
196 {
197 const uint8_t *buf = avpkt->
data;
198 int buf_size = avpkt->
size;
200 int copy = !
s->current_frame->data[0] &&
s->last_frame->data[0];
203
206
211 }
212
215
218 *got_frame = 1;
219
220 /* shuffle frames */
222
223 return buf_size;
224 }
225
227 {
229
232
233 return 0;
234 }
235
247 };