allocate PPS and SPS dynamically
[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 #define avg2(a,b) av_clip_uint8(((int)(a)+(int)(b)+1)>>1)
40 #define avg4(a,b,c,d) av_clip_uint8(((int)(a)+(int)(b)+(int)(c)+(int)(d)+2)>>2)
41
42 #define get_byte(in_buffer) *(in_buffer++)
43
44 static void roqvideo_decode_frame(RoqContext *ri)
45 {
46 unsigned int chunk_id = 0, chunk_arg = 0;
47 unsigned long chunk_size = 0;
48 int i, j, k, nv1, nv2, vqflg = 0, vqflg_pos = -1;
49 int vqid, bpos, xpos, ypos, xp, yp, x, y, mx, my;
50 int frame_stats[2][4] = {{0},{0}};
51 roq_qcell *qcell;
52 unsigned char *buf = ri->buf;
53 unsigned char *buf_end = ri->buf + ri->size;
54
55 while (buf < buf_end) {
56 chunk_id = bytestream_get_le16(&buf);
57 chunk_size = bytestream_get_le32(&buf);
58 chunk_arg = bytestream_get_le16(&buf);
59
60 if(chunk_id == RoQ_QUAD_VQ)
61 break;
62 if(chunk_id == RoQ_QUAD_CODEBOOK) {
63 if((nv1 = chunk_arg >> 8) == 0)
64 nv1 = 256;
65 if((nv2 = chunk_arg & 0xff) == 0 && nv1 * 6 < chunk_size)
66 nv2 = 256;
67 for(i = 0; i < nv1; i++) {
68 ri->cells[i].y[0] = get_byte(buf);
69 ri->cells[i].y[1] = get_byte(buf);
70 ri->cells[i].y[2] = get_byte(buf);
71 ri->cells[i].y[3] = get_byte(buf);
72 ri->cells[i].u = get_byte(buf);
73 ri->cells[i].v = get_byte(buf);
74 }
75 for(i = 0; i < nv2; i++)
76 for(j = 0; j < 4; j++)
77 ri->qcells[i].idx[j] = get_byte(buf);
78 }
79 }
80
81 bpos = xpos = ypos = 0;
82 while(bpos < chunk_size) {
83 for (yp = ypos; yp < ypos + 16; yp += 8)
84 for (xp = xpos; xp < xpos + 16; xp += 8) {
85 if (vqflg_pos < 0) {
86 vqflg = buf[bpos++]; vqflg |= (buf[bpos++] << 8);
87 vqflg_pos = 7;
88 }
89 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
90 frame_stats[0][vqid]++;
91 vqflg_pos--;
92
93 switch(vqid) {
94 case RoQ_ID_MOT:
95 ff_apply_motion_8x8(ri, xp, yp, 0, 0);
96 break;
97 case RoQ_ID_FCC:
98 mx = 8 - (buf[bpos] >> 4) - ((signed char) (chunk_arg >> 8));
99 my = 8 - (buf[bpos++] & 0xf) - ((signed char) chunk_arg);
100 ff_apply_motion_8x8(ri, xp, yp, mx, my);
101 break;
102 case RoQ_ID_SLD:
103 qcell = ri->qcells + buf[bpos++];
104 ff_apply_vector_4x4(ri, xp, yp, ri->cells + qcell->idx[0]);
105 ff_apply_vector_4x4(ri, xp+4, yp, ri->cells + qcell->idx[1]);
106 ff_apply_vector_4x4(ri, xp, yp+4, ri->cells + qcell->idx[2]);
107 ff_apply_vector_4x4(ri, xp+4, yp+4, ri->cells + qcell->idx[3]);
108 break;
109 case RoQ_ID_CCC:
110 for (k = 0; k < 4; k++) {
111 x = xp; y = yp;
112 if(k & 0x01) x += 4;
113 if(k & 0x02) y += 4;
114
115 if (vqflg_pos < 0) {
116 vqflg = buf[bpos++];
117 vqflg |= (buf[bpos++] << 8);
118 vqflg_pos = 7;
119 }
120 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
121 frame_stats[1][vqid]++;
122 vqflg_pos--;
123 switch(vqid) {
124 case RoQ_ID_MOT:
125 ff_apply_motion_4x4(ri, x, y, 0, 0);
126 break;
127 case RoQ_ID_FCC:
128 mx = 8 - (buf[bpos] >> 4) - ((signed char) (chunk_arg >> 8));
129 my = 8 - (buf[bpos++] & 0xf) - ((signed char) chunk_arg);
130 ff_apply_motion_4x4(ri, x, y, mx, my);
131 break;
132 case RoQ_ID_SLD:
133 qcell = ri->qcells + buf[bpos++];
134 ff_apply_vector_2x2(ri, x, y, ri->cells + qcell->idx[0]);
135 ff_apply_vector_2x2(ri, x+2, y, ri->cells + qcell->idx[1]);
136 ff_apply_vector_2x2(ri, x, y+2, ri->cells + qcell->idx[2]);
137 ff_apply_vector_2x2(ri, x+2, y+2, ri->cells + qcell->idx[3]);
138 break;
139 case RoQ_ID_CCC:
140 ff_apply_vector_2x2(ri, x, y, ri->cells + buf[bpos]);
141 ff_apply_vector_2x2(ri, x+2, y, ri->cells + buf[bpos+1]);
142 ff_apply_vector_2x2(ri, x, y+2, ri->cells + buf[bpos+2]);
143 ff_apply_vector_2x2(ri, x+2, y+2, ri->cells + buf[bpos+3]);
144 bpos += 4;
145 break;
146 }
147 }
148 break;
149 default:
150 av_log(ri->avctx, AV_LOG_ERROR, "Unknown vq code: %d\n", vqid);
151 }
152 }
153
154 xpos += 16;
155 if (xpos >= ri->avctx->width) {
156 xpos -= ri->avctx->width;
157 ypos += 16;
158 }
159 if(ypos >= ri->avctx->height)
160 break;
161 }
162 }
163
164
165 static int roq_decode_init(AVCodecContext *avctx)
166 {
167 RoqContext *s = avctx->priv_data;
168
169 s->avctx = avctx;
170 s->first_frame = 1;
171 s->last_frame = &s->frames[0];
172 s->current_frame = &s->frames[1];
173 avctx->pix_fmt = PIX_FMT_YUV420P;
174 dsputil_init(&s->dsp, avctx);
175
176 return 0;
177 }
178
179 static int roq_decode_frame(AVCodecContext *avctx,
180 void *data, int *data_size,
181 uint8_t *buf, int buf_size)
182 {
183 RoqContext *s = avctx->priv_data;
184
185 if (avctx->get_buffer(avctx, s->current_frame)) {
186 av_log(avctx, AV_LOG_ERROR, " RoQ: get_buffer() failed\n");
187 return -1;
188 }
189 s->y_stride = s->current_frame->linesize[0];
190 s->c_stride = s->current_frame->linesize[1];
191
192 s->buf = buf;
193 s->size = buf_size;
194 roqvideo_decode_frame(s);
195
196 /* release the last frame if it is allocated */
197 if (s->first_frame)
198 s->first_frame = 0;
199 else
200 avctx->release_buffer(avctx, s->last_frame);
201
202 *data_size = sizeof(AVFrame);
203 *(AVFrame*)data = *s->current_frame;
204
205 /* shuffle frames */
206 FFSWAP(AVFrame *, s->current_frame, s->last_frame);
207
208 return buf_size;
209 }
210
211 static int roq_decode_end(AVCodecContext *avctx)
212 {
213 RoqContext *s = avctx->priv_data;
214
215 /* release the last frame */
216 if (s->last_frame->data[0])
217 avctx->release_buffer(avctx, s->last_frame);
218
219 return 0;
220 }
221
222 AVCodec roq_decoder = {
223 "roqvideo",
224 CODEC_TYPE_VIDEO,
225 CODEC_ID_ROQ,
226 sizeof(RoqContext),
227 roq_decode_init,
228 NULL,
229 roq_decode_end,
230 roq_decode_frame,
231 CODEC_CAP_DR1,
232 };