Statistics
| Branch: | Revision:

ffmpeg / libavcodec / roqvideodec.c @ b31178c9

History | View | Annotate | Download (7.54 KB)

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
};