67687cea9ee3c547dbf82bd34b3fc6e78fb262fb
[libav.git] / libavcodec / roqvideodec.c
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 roqvideodec.c
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
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <string.h>
31 #include <unistd.h>
32
33 #include "avcodec.h"
34 #include "bytestream.h"
35 #include "dsputil.h"
36 #include "roqvideo.h"
37
38 static void roqvideo_decode_frame(RoqContext *ri)
39 {
40 unsigned int chunk_id = 0, chunk_arg = 0;
41 unsigned long chunk_size = 0;
42 int i, j, k, nv1, nv2, vqflg = 0, vqflg_pos = -1;
43 int vqid, bpos, xpos, ypos, xp, yp, x, y, mx, my;
44 int frame_stats[2][4] = {{0},{0}};
45 roq_qcell *qcell;
46 const unsigned char *buf = ri->buf;
47 unsigned char *buf_end = ri->buf + ri->size;
48
49 while (buf < buf_end) {
50 chunk_id = bytestream_get_le16(&buf);
51 chunk_size = bytestream_get_le32(&buf);
52 chunk_arg = bytestream_get_le16(&buf);
53
54 if(chunk_id == RoQ_QUAD_VQ)
55 break;
56 if(chunk_id == RoQ_QUAD_CODEBOOK) {
57 if((nv1 = chunk_arg >> 8) == 0)
58 nv1 = 256;
59 if((nv2 = chunk_arg & 0xff) == 0 && nv1 * 6 < chunk_size)
60 nv2 = 256;
61 for(i = 0; i < nv1; i++) {
62 ri->cb2x2[i].y[0] = *buf++;
63 ri->cb2x2[i].y[1] = *buf++;
64 ri->cb2x2[i].y[2] = *buf++;
65 ri->cb2x2[i].y[3] = *buf++;
66 ri->cb2x2[i].u = *buf++;
67 ri->cb2x2[i].v = *buf++;
68 }
69 for(i = 0; i < nv2; i++)
70 for(j = 0; j < 4; j++)
71 ri->cb4x4[i].idx[j] = *buf++;
72 }
73 }
74
75 bpos = xpos = ypos = 0;
76 while(bpos < chunk_size) {
77 for (yp = ypos; yp < ypos + 16; yp += 8)
78 for (xp = xpos; xp < xpos + 16; xp += 8) {
79 if (vqflg_pos < 0) {
80 vqflg = buf[bpos++]; vqflg |= (buf[bpos++] << 8);
81 vqflg_pos = 7;
82 }
83 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
84 frame_stats[0][vqid]++;
85 vqflg_pos--;
86
87 switch(vqid) {
88 case RoQ_ID_MOT:
89 break;
90 case RoQ_ID_FCC:
91 mx = 8 - (buf[bpos] >> 4) - ((signed char) (chunk_arg >> 8));
92 my = 8 - (buf[bpos++] & 0xf) - ((signed char) chunk_arg);
93 ff_apply_motion_8x8(ri, xp, yp, mx, my);
94 break;
95 case RoQ_ID_SLD:
96 qcell = ri->cb4x4 + buf[bpos++];
97 ff_apply_vector_4x4(ri, xp, yp, ri->cb2x2 + qcell->idx[0]);
98 ff_apply_vector_4x4(ri, xp+4, yp, ri->cb2x2 + qcell->idx[1]);
99 ff_apply_vector_4x4(ri, xp, yp+4, ri->cb2x2 + qcell->idx[2]);
100 ff_apply_vector_4x4(ri, xp+4, yp+4, ri->cb2x2 + qcell->idx[3]);
101 break;
102 case RoQ_ID_CCC:
103 for (k = 0; k < 4; k++) {
104 x = xp; y = yp;
105 if(k & 0x01) x += 4;
106 if(k & 0x02) y += 4;
107
108 if (vqflg_pos < 0) {
109 vqflg = buf[bpos++];
110 vqflg |= (buf[bpos++] << 8);
111 vqflg_pos = 7;
112 }
113 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
114 frame_stats[1][vqid]++;
115 vqflg_pos--;
116 switch(vqid) {
117 case RoQ_ID_MOT:
118 break;
119 case RoQ_ID_FCC:
120 mx = 8 - (buf[bpos] >> 4) - ((signed char) (chunk_arg >> 8));
121 my = 8 - (buf[bpos++] & 0xf) - ((signed char) chunk_arg);
122 ff_apply_motion_4x4(ri, x, y, mx, my);
123 break;
124 case RoQ_ID_SLD:
125 qcell = ri->cb4x4 + buf[bpos++];
126 ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + qcell->idx[0]);
127 ff_apply_vector_2x2(ri, x+2, y, ri->cb2x2 + qcell->idx[1]);
128 ff_apply_vector_2x2(ri, x, y+2, ri->cb2x2 + qcell->idx[2]);
129 ff_apply_vector_2x2(ri, x+2, y+2, ri->cb2x2 + qcell->idx[3]);
130 break;
131 case RoQ_ID_CCC:
132 ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + buf[bpos]);
133 ff_apply_vector_2x2(ri, x+2, y, ri->cb2x2 + buf[bpos+1]);
134 ff_apply_vector_2x2(ri, x, y+2, ri->cb2x2 + buf[bpos+2]);
135 ff_apply_vector_2x2(ri, x+2, y+2, ri->cb2x2 + buf[bpos+3]);
136 bpos += 4;
137 break;
138 }
139 }
140 break;
141 default:
142 av_log(ri->avctx, AV_LOG_ERROR, "Unknown vq code: %d\n", vqid);
143 }
144 }
145
146 xpos += 16;
147 if (xpos >= ri->width) {
148 xpos -= ri->width;
149 ypos += 16;
150 }
151 if(ypos >= ri->height)
152 break;
153 }
154 }
155
156
157 static int roq_decode_init(AVCodecContext *avctx)
158 {
159 RoqContext *s = avctx->priv_data;
160
161 s->avctx = avctx;
162 s->width = avctx->width;
163 s->height = avctx->height;
164 s->last_frame = &s->frames[0];
165 s->current_frame = &s->frames[1];
166 avctx->pix_fmt = PIX_FMT_YUV444P;
167 dsputil_init(&s->dsp, avctx);
168
169 return 0;
170 }
171
172 static int roq_decode_frame(AVCodecContext *avctx,
173 void *data, int *data_size,
174 const uint8_t *buf, int buf_size)
175 {
176 RoqContext *s = avctx->priv_data;
177 int copy= !s->current_frame->data[0];
178
179 if (avctx->reget_buffer(avctx, s->current_frame)) {
180 av_log(avctx, AV_LOG_ERROR, " RoQ: get_buffer() failed\n");
181 return -1;
182 }
183
184 if(copy)
185 av_picture_copy((AVPicture*)s->current_frame, (AVPicture*)s->last_frame,
186 avctx->pix_fmt, avctx->width, avctx->height);
187
188 s->buf = buf;
189 s->size = buf_size;
190 roqvideo_decode_frame(s);
191
192 *data_size = sizeof(AVFrame);
193 *(AVFrame*)data = *s->current_frame;
194
195 /* shuffle frames */
196 FFSWAP(AVFrame *, s->current_frame, s->last_frame);
197
198 return buf_size;
199 }
200
201 static int roq_decode_end(AVCodecContext *avctx)
202 {
203 RoqContext *s = avctx->priv_data;
204
205 /* release the last frame */
206 if (s->last_frame->data[0])
207 avctx->release_buffer(avctx, s->last_frame);
208 if (s->current_frame->data[0])
209 avctx->release_buffer(avctx, s->current_frame);
210
211 return 0;
212 }
213
214 AVCodec roq_decoder = {
215 "roqvideo",
216 CODEC_TYPE_VIDEO,
217 CODEC_ID_ROQ,
218 sizeof(RoqContext),
219 roq_decode_init,
220 NULL,
221 roq_decode_end,
222 roq_decode_frame,
223 CODEC_CAP_DR1,
224 };