2 * Copyright (C) 2003 the ffmpeg project
4 * This file is part of FFmpeg.
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.
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.
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
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/
34 #include "bytestream.h"
38 static void roqvideo_decode_frame(RoqContext *ri)
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}};
46 unsigned char *buf = ri->buf;
47 unsigned char *buf_end = ri->buf + ri->size;
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);
54 if(chunk_id == RoQ_QUAD_VQ)
56 if(chunk_id == RoQ_QUAD_CODEBOOK) {
57 if((nv1 = chunk_arg >> 8) == 0)
59 if((nv2 = chunk_arg & 0xff) == 0 && nv1 * 6 < chunk_size)
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++;
69 for(i = 0; i < nv2; i++)
70 for(j = 0; j < 4; j++)
71 ri->cb4x4[i].idx[j] = *buf++;
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) {
80 vqflg = buf[bpos++]; vqflg |= (buf[bpos++] << 8);
83 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
84 frame_stats[0][vqid]++;
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);
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]);
103 for (k = 0; k < 4; k++) {
110 vqflg |= (buf[bpos++] << 8);
113 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
114 frame_stats[1][vqid]++;
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);
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]);
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]);
142 av_log(ri->avctx, AV_LOG_ERROR, "Unknown vq code: %d\n", vqid);
147 if (xpos >= ri->width) {
151 if(ypos >= ri->height)
157 static int roq_decode_init(AVCodecContext *avctx)
159 RoqContext *s = avctx->priv_data;
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);
172 static int roq_decode_frame(AVCodecContext *avctx,
173 void *data, int *data_size,
174 uint8_t *buf, int buf_size)
176 RoqContext *s = avctx->priv_data;
178 if (avctx->reget_buffer(avctx, s->current_frame)) {
179 av_log(avctx, AV_LOG_ERROR, " RoQ: get_buffer() failed\n");
185 roqvideo_decode_frame(s);
187 *data_size = sizeof(AVFrame);
188 *(AVFrame*)data = *s->current_frame;
191 FFSWAP(AVFrame *, s->current_frame, s->last_frame);
196 static int roq_decode_end(AVCodecContext *avctx)
198 RoqContext *s = avctx->priv_data;
200 /* release the last frame */
201 if (s->last_frame->data[0])
202 avctx->release_buffer(avctx, s->last_frame);
203 if (s->current_frame->data[0])
204 avctx->release_buffer(avctx, s->current_frame);
209 AVCodec roq_decoder = {