2836912f7890ef902b278ee2ea6bc52361b5239b
[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 /**
23 * @file roqvideodec.c
24 * Id RoQ Video Decoder by Dr. Tim Ferguson
25 * For more information about the Id RoQ format, visit:
26 * http://www.csse.monash.edu.au/~timf/
27 */
28
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <string.h>
32 #include <unistd.h>
33
34 #include "avcodec.h"
35 #include "bytestream.h"
36 #include "dsputil.h"
37 #include "roqvideo.h"
38
39 static void roqvideo_decode_frame(RoqContext *ri)
40 {
41 unsigned int chunk_id = 0, chunk_arg = 0;
42 unsigned long chunk_size = 0;
43 int i, j, k, nv1, nv2, vqflg = 0, vqflg_pos = -1;
44 int vqid, bpos, xpos, ypos, xp, yp, x, y, mx, my;
45 int frame_stats[2][4] = {{0},{0}};
46 roq_qcell *qcell;
47 unsigned char *buf = ri->buf;
48 unsigned char *buf_end = ri->buf + ri->size;
49
50 while (buf < buf_end) {
51 chunk_id = bytestream_get_le16(&buf);
52 chunk_size = bytestream_get_le32(&buf);
53 chunk_arg = bytestream_get_le16(&buf);
54
55 if(chunk_id == RoQ_QUAD_VQ)
56 break;
57 if(chunk_id == RoQ_QUAD_CODEBOOK) {
58 if((nv1 = chunk_arg >> 8) == 0)
59 nv1 = 256;
60 if((nv2 = chunk_arg & 0xff) == 0 && nv1 * 6 < chunk_size)
61 nv2 = 256;
62 for(i = 0; i < nv1; i++) {
63 ri->cb2x2[i].y[0] = *buf++;
64 ri->cb2x2[i].y[1] = *buf++;
65 ri->cb2x2[i].y[2] = *buf++;
66 ri->cb2x2[i].y[3] = *buf++;
67 ri->cb2x2[i].u = *buf++;
68 ri->cb2x2[i].v = *buf++;
69 }
70 for(i = 0; i < nv2; i++)
71 for(j = 0; j < 4; j++)
72 ri->cb4x4[i].idx[j] = *buf++;
73 }
74 }
75
76 bpos = xpos = ypos = 0;
77 while(bpos < chunk_size) {
78 for (yp = ypos; yp < ypos + 16; yp += 8)
79 for (xp = xpos; xp < xpos + 16; xp += 8) {
80 if (vqflg_pos < 0) {
81 vqflg = buf[bpos++]; vqflg |= (buf[bpos++] << 8);
82 vqflg_pos = 7;
83 }
84 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
85 frame_stats[0][vqid]++;
86 vqflg_pos--;
87
88 switch(vqid) {
89 case RoQ_ID_MOT:
90 break;
91 case RoQ_ID_FCC:
92 mx = 8 - (buf[bpos] >> 4) - ((signed char) (chunk_arg >> 8));
93 my = 8 - (buf[bpos++] & 0xf) - ((signed char) chunk_arg);
94 ff_apply_motion_8x8(ri, xp, yp, mx, my);
95 break;
96 case RoQ_ID_SLD:
97 qcell = ri->cb4x4 + buf[bpos++];
98 ff_apply_vector_4x4(ri, xp, yp, ri->cb2x2 + qcell->idx[0]);
99 ff_apply_vector_4x4(ri, xp+4, yp, ri->cb2x2 + qcell->idx[1]);
100 ff_apply_vector_4x4(ri, xp, yp+4, ri->cb2x2 + qcell->idx[2]);
101 ff_apply_vector_4x4(ri, xp+4, yp+4, ri->cb2x2 + qcell->idx[3]);
102 break;
103 case RoQ_ID_CCC:
104 for (k = 0; k < 4; k++) {
105 x = xp; y = yp;
106 if(k & 0x01) x += 4;
107 if(k & 0x02) y += 4;
108
109 if (vqflg_pos < 0) {
110 vqflg = buf[bpos++];
111 vqflg |= (buf[bpos++] << 8);
112 vqflg_pos = 7;
113 }
114 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
115 frame_stats[1][vqid]++;
116 vqflg_pos--;
117 switch(vqid) {
118 case RoQ_ID_MOT:
119 break;
120 case RoQ_ID_FCC:
121 mx = 8 - (buf[bpos] >> 4) - ((signed char) (chunk_arg >> 8));
122 my = 8 - (buf[bpos++] & 0xf) - ((signed char) chunk_arg);
123 ff_apply_motion_4x4(ri, x, y, mx, my);
124 break;
125 case RoQ_ID_SLD:
126 qcell = ri->cb4x4 + buf[bpos++];
127 ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + qcell->idx[0]);
128 ff_apply_vector_2x2(ri, x+2, y, ri->cb2x2 + qcell->idx[1]);
129 ff_apply_vector_2x2(ri, x, y+2, ri->cb2x2 + qcell->idx[2]);
130 ff_apply_vector_2x2(ri, x+2, y+2, ri->cb2x2 + qcell->idx[3]);
131 break;
132 case RoQ_ID_CCC:
133 ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + buf[bpos]);
134 ff_apply_vector_2x2(ri, x+2, y, ri->cb2x2 + buf[bpos+1]);
135 ff_apply_vector_2x2(ri, x, y+2, ri->cb2x2 + buf[bpos+2]);
136 ff_apply_vector_2x2(ri, x+2, y+2, ri->cb2x2 + buf[bpos+3]);
137 bpos += 4;
138 break;
139 }
140 }
141 break;
142 default:
143 av_log(ri->avctx, AV_LOG_ERROR, "Unknown vq code: %d\n", vqid);
144 }
145 }
146
147 xpos += 16;
148 if (xpos >= ri->avctx->width) {
149 xpos -= ri->avctx->width;
150 ypos += 16;
151 }
152 if(ypos >= ri->avctx->height)
153 break;
154 }
155 }
156
157
158 static int roq_decode_init(AVCodecContext *avctx)
159 {
160 RoqContext *s = avctx->priv_data;
161
162 s->avctx = avctx;
163 s->last_frame = &s->frames[0];
164 s->current_frame = &s->frames[1];
165 avctx->pix_fmt = PIX_FMT_YUV444P;
166 dsputil_init(&s->dsp, avctx);
167
168 return 0;
169 }
170
171 static int roq_decode_frame(AVCodecContext *avctx,
172 void *data, int *data_size,
173 uint8_t *buf, int buf_size)
174 {
175 RoqContext *s = avctx->priv_data;
176
177 if (avctx->reget_buffer(avctx, s->current_frame)) {
178 av_log(avctx, AV_LOG_ERROR, " RoQ: get_buffer() failed\n");
179 return -1;
180 }
181 s->y_stride = s->current_frame->linesize[0];
182 s->c_stride = s->current_frame->linesize[1];
183
184 s->buf = buf;
185 s->size = buf_size;
186 roqvideo_decode_frame(s);
187
188 *data_size = sizeof(AVFrame);
189 *(AVFrame*)data = *s->current_frame;
190
191 /* shuffle frames */
192 FFSWAP(AVFrame *, s->current_frame, s->last_frame);
193
194 return buf_size;
195 }
196
197 static int roq_decode_end(AVCodecContext *avctx)
198 {
199 RoqContext *s = avctx->priv_data;
200
201 /* release the last frame */
202 if (s->last_frame->data[0])
203 avctx->release_buffer(avctx, s->last_frame);
204 if (s->current_frame->data[0])
205 avctx->release_buffer(avctx, s->current_frame);
206
207 return 0;
208 }
209
210 AVCodec roq_decoder = {
211 "roqvideo",
212 CODEC_TYPE_VIDEO,
213 CODEC_ID_ROQ,
214 sizeof(RoqContext),
215 roq_decode_init,
216 NULL,
217 roq_decode_end,
218 roq_decode_frame,
219 CODEC_CAP_DR1,
220 };