roqvideodec.c 7.71 KB
Newer Older
1 2 3
/*
 * Copyright (C) 2003 the ffmpeg project
 *
4
 * This file is part of Libav.
5
 *
6
 * Libav is free software; you can redistribute it and/or
7 8 9 10
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
11
 * Libav is distributed in the hope that it will be useful,
12 13 14 15 16
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
17
 * License along with Libav; if not, write to the Free Software
18 19 20 21
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
22
 * @file
23 24
 * id RoQ Video Decoder by Dr. Tim Ferguson
 * For more information about the id RoQ format, visit:
25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
 *   http://www.csse.monash.edu.au/~timf/
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "avcodec.h"
#include "bytestream.h"
#include "roqvideo.h"

static void roqvideo_decode_frame(RoqContext *ri)
{
    unsigned int chunk_id = 0, chunk_arg = 0;
    unsigned long chunk_size = 0;
    int i, j, k, nv1, nv2, vqflg = 0, vqflg_pos = -1;
    int vqid, bpos, xpos, ypos, xp, yp, x, y, mx, my;
    int frame_stats[2][4] = {{0},{0}};
    roq_qcell *qcell;
Michael Niedermayer's avatar
Michael Niedermayer committed
44
    const unsigned char *buf = ri->buf;
45
    const unsigned char *buf_end = ri->buf + ri->size;
46 47 48 49 50 51 52 53 54 55 56 57 58 59

    while (buf < buf_end) {
        chunk_id = bytestream_get_le16(&buf);
        chunk_size = bytestream_get_le32(&buf);
        chunk_arg = bytestream_get_le16(&buf);

        if(chunk_id == RoQ_QUAD_VQ)
            break;
        if(chunk_id == RoQ_QUAD_CODEBOOK) {
            if((nv1 = chunk_arg >> 8) == 0)
                nv1 = 256;
            if((nv2 = chunk_arg & 0xff) == 0 && nv1 * 6 < chunk_size)
                nv2 = 256;
            for(i = 0; i < nv1; i++) {
Eric Lasota's avatar
Eric Lasota committed
60 61 62 63 64 65
                ri->cb2x2[i].y[0] = *buf++;
                ri->cb2x2[i].y[1] = *buf++;
                ri->cb2x2[i].y[2] = *buf++;
                ri->cb2x2[i].y[3] = *buf++;
                ri->cb2x2[i].u = *buf++;
                ri->cb2x2[i].v = *buf++;
66 67 68
            }
            for(i = 0; i < nv2; i++)
                for(j = 0; j < 4; j++)
Eric Lasota's avatar
Eric Lasota committed
69
                    ri->cb4x4[i].idx[j] = *buf++;
70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93
        }
    }

    bpos = xpos = ypos = 0;
    while(bpos < chunk_size) {
        for (yp = ypos; yp < ypos + 16; yp += 8)
            for (xp = xpos; xp < xpos + 16; xp += 8) {
                if (vqflg_pos < 0) {
                    vqflg = buf[bpos++]; vqflg |= (buf[bpos++] << 8);
                    vqflg_pos = 7;
                }
                vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
                frame_stats[0][vqid]++;
                vqflg_pos--;

                switch(vqid) {
                case RoQ_ID_MOT:
                    break;
                case RoQ_ID_FCC:
                    mx = 8 - (buf[bpos] >> 4) - ((signed char) (chunk_arg >> 8));
                    my = 8 - (buf[bpos++] & 0xf) - ((signed char) chunk_arg);
                    ff_apply_motion_8x8(ri, xp, yp, mx, my);
                    break;
                case RoQ_ID_SLD:
Eric Lasota's avatar
Eric Lasota committed
94 95 96 97 98
                    qcell = ri->cb4x4 + buf[bpos++];
                    ff_apply_vector_4x4(ri, xp, yp, ri->cb2x2 + qcell->idx[0]);
                    ff_apply_vector_4x4(ri, xp+4, yp, ri->cb2x2 + qcell->idx[1]);
                    ff_apply_vector_4x4(ri, xp, yp+4, ri->cb2x2 + qcell->idx[2]);
                    ff_apply_vector_4x4(ri, xp+4, yp+4, ri->cb2x2 + qcell->idx[3]);
99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122
                    break;
                case RoQ_ID_CCC:
                    for (k = 0; k < 4; k++) {
                        x = xp; y = yp;
                        if(k & 0x01) x += 4;
                        if(k & 0x02) y += 4;

                        if (vqflg_pos < 0) {
                            vqflg = buf[bpos++];
                            vqflg |= (buf[bpos++] << 8);
                            vqflg_pos = 7;
                        }
                        vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
                        frame_stats[1][vqid]++;
                        vqflg_pos--;
                        switch(vqid) {
                        case RoQ_ID_MOT:
                            break;
                        case RoQ_ID_FCC:
                            mx = 8 - (buf[bpos] >> 4) - ((signed char) (chunk_arg >> 8));
                            my = 8 - (buf[bpos++] & 0xf) - ((signed char) chunk_arg);
                            ff_apply_motion_4x4(ri, x, y, mx, my);
                            break;
                        case RoQ_ID_SLD:
Eric Lasota's avatar
Eric Lasota committed
123 124 125 126 127
                            qcell = ri->cb4x4 + buf[bpos++];
                            ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + qcell->idx[0]);
                            ff_apply_vector_2x2(ri, x+2, y, ri->cb2x2 + qcell->idx[1]);
                            ff_apply_vector_2x2(ri, x, y+2, ri->cb2x2 + qcell->idx[2]);
                            ff_apply_vector_2x2(ri, x+2, y+2, ri->cb2x2 + qcell->idx[3]);
128 129
                            break;
                        case RoQ_ID_CCC:
Eric Lasota's avatar
Eric Lasota committed
130 131 132 133
                            ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + buf[bpos]);
                            ff_apply_vector_2x2(ri, x+2, y, ri->cb2x2 + buf[bpos+1]);
                            ff_apply_vector_2x2(ri, x, y+2, ri->cb2x2 + buf[bpos+2]);
                            ff_apply_vector_2x2(ri, x+2, y+2, ri->cb2x2 + buf[bpos+3]);
134 135 136 137 138 139 140 141 142 143 144
                            bpos += 4;
                            break;
                        }
                    }
                    break;
                default:
                    av_log(ri->avctx, AV_LOG_ERROR, "Unknown vq code: %d\n", vqid);
            }
        }

        xpos += 16;
145 146
        if (xpos >= ri->width) {
            xpos -= ri->width;
147 148
            ypos += 16;
        }
149
        if(ypos >= ri->height)
150 151 152 153 154
            break;
    }
}


155
static av_cold int roq_decode_init(AVCodecContext *avctx)
156 157 158 159
{
    RoqContext *s = avctx->priv_data;

    s->avctx = avctx;
160 161
    s->width = avctx->width;
    s->height = avctx->height;
162 163
    s->last_frame    = &s->frames[0];
    s->current_frame = &s->frames[1];
164
    avctx->pix_fmt = PIX_FMT_YUV444P;
165 166 167 168 169 170

    return 0;
}

static int roq_decode_frame(AVCodecContext *avctx,
                            void *data, int *data_size,
171
                            AVPacket *avpkt)
172
{
173 174
    const uint8_t *buf = avpkt->data;
    int buf_size = avpkt->size;
175
    RoqContext *s = avctx->priv_data;
176
    int copy= !s->current_frame->data[0];
177

Michael Niedermayer's avatar
Michael Niedermayer committed
178
    if (avctx->reget_buffer(avctx, s->current_frame)) {
179 180 181 182
        av_log(avctx, AV_LOG_ERROR, "  RoQ: get_buffer() failed\n");
        return -1;
    }

183 184 185 186
    if(copy)
        av_picture_copy((AVPicture*)s->current_frame, (AVPicture*)s->last_frame,
                        avctx->pix_fmt, avctx->width, avctx->height);

187 188 189 190 191 192 193 194 195 196 197 198 199
    s->buf = buf;
    s->size = buf_size;
    roqvideo_decode_frame(s);

    *data_size = sizeof(AVFrame);
    *(AVFrame*)data = *s->current_frame;

    /* shuffle frames */
    FFSWAP(AVFrame *, s->current_frame, s->last_frame);

    return buf_size;
}

200
static av_cold int roq_decode_end(AVCodecContext *avctx)
201 202 203 204 205 206
{
    RoqContext *s = avctx->priv_data;

    /* release the last frame */
    if (s->last_frame->data[0])
        avctx->release_buffer(avctx, s->last_frame);
Michael Niedermayer's avatar
Michael Niedermayer committed
207 208
    if (s->current_frame->data[0])
        avctx->release_buffer(avctx, s->current_frame);
209 210 211 212

    return 0;
}

213
AVCodec ff_roq_decoder = {
214 215 216 217 218 219 220 221
    .name           = "roqvideo",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = CODEC_ID_ROQ,
    .priv_data_size = sizeof(RoqContext),
    .init           = roq_decode_init,
    .close          = roq_decode_end,
    .decode         = roq_decode_frame,
    .capabilities   = CODEC_CAP_DR1,
222
    .long_name = NULL_IF_CONFIG_SMALL("id RoQ video"),
223
};