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/
33 #include "bytestream.h"
36 static void roqvideo_decode_frame(RoqContext *ri)
38 unsigned int chunk_id = 0, chunk_arg = 0;
39 unsigned long chunk_size = 0;
40 int i, j, k, nv1, nv2, vqflg = 0, vqflg_pos = -1;
41 int vqid, bpos, xpos, ypos, xp, yp, x, y, mx, my;
42 int frame_stats[2][4] = {{0},{0}};
44 const unsigned char *buf = ri->buf;
45 const unsigned char *buf_end = ri->buf + ri->size;
47 while (buf < buf_end) {
48 chunk_id = bytestream_get_le16(&buf);
49 chunk_size = bytestream_get_le32(&buf);
50 chunk_arg = bytestream_get_le16(&buf);
52 if(chunk_id == RoQ_QUAD_VQ)
54 if(chunk_id == RoQ_QUAD_CODEBOOK) {
55 if((nv1 = chunk_arg >> 8) == 0)
57 if((nv2 = chunk_arg & 0xff) == 0 && nv1 * 6 < chunk_size)
59 for(i = 0; i < nv1; i++) {
60 ri->cb2x2[i].y[0] = *buf++;
61 ri->cb2x2[i].y[1] = *buf++;
62 ri->cb2x2[i].y[2] = *buf++;
63 ri->cb2x2[i].y[3] = *buf++;
64 ri->cb2x2[i].u = *buf++;
65 ri->cb2x2[i].v = *buf++;
67 for(i = 0; i < nv2; i++)
68 for(j = 0; j < 4; j++)
69 ri->cb4x4[i].idx[j] = *buf++;
73 bpos = xpos = ypos = 0;
74 if (chunk_size > buf_end - buf) {
75 av_log(ri->avctx, AV_LOG_ERROR, "Chunk does not fit in input buffer\n");
76 chunk_size = buf_end - buf;
78 while(bpos < chunk_size) {
79 for (yp = ypos; yp < ypos + 16; yp += 8)
80 for (xp = xpos; xp < xpos + 16; xp += 8) {
81 if (bpos >= chunk_size) {
82 av_log(ri->avctx, AV_LOG_ERROR, "Input buffer too small\n");
86 vqflg = buf[bpos++]; vqflg |= (buf[bpos++] << 8);
89 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
90 frame_stats[0][vqid]++;
97 mx = 8 - (buf[bpos] >> 4) - ((signed char) (chunk_arg >> 8));
98 my = 8 - (buf[bpos++] & 0xf) - ((signed char) chunk_arg);
99 ff_apply_motion_8x8(ri, xp, yp, mx, my);
102 qcell = ri->cb4x4 + buf[bpos++];
103 ff_apply_vector_4x4(ri, xp, yp, ri->cb2x2 + qcell->idx[0]);
104 ff_apply_vector_4x4(ri, xp+4, yp, ri->cb2x2 + qcell->idx[1]);
105 ff_apply_vector_4x4(ri, xp, yp+4, ri->cb2x2 + qcell->idx[2]);
106 ff_apply_vector_4x4(ri, xp+4, yp+4, ri->cb2x2 + qcell->idx[3]);
109 for (k = 0; k < 4; k++) {
114 if (bpos >= chunk_size) {
115 av_log(ri->avctx, AV_LOG_ERROR, "Input buffer too small\n");
120 vqflg |= (buf[bpos++] << 8);
123 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
124 frame_stats[1][vqid]++;
130 mx = 8 - (buf[bpos] >> 4) - ((signed char) (chunk_arg >> 8));
131 my = 8 - (buf[bpos++] & 0xf) - ((signed char) chunk_arg);
132 ff_apply_motion_4x4(ri, x, y, mx, my);
135 qcell = ri->cb4x4 + buf[bpos++];
136 ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + qcell->idx[0]);
137 ff_apply_vector_2x2(ri, x+2, y, ri->cb2x2 + qcell->idx[1]);
138 ff_apply_vector_2x2(ri, x, y+2, ri->cb2x2 + qcell->idx[2]);
139 ff_apply_vector_2x2(ri, x+2, y+2, ri->cb2x2 + qcell->idx[3]);
142 ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + buf[bpos]);
143 ff_apply_vector_2x2(ri, x+2, y, ri->cb2x2 + buf[bpos+1]);
144 ff_apply_vector_2x2(ri, x, y+2, ri->cb2x2 + buf[bpos+2]);
145 ff_apply_vector_2x2(ri, x+2, y+2, ri->cb2x2 + buf[bpos+3]);
152 av_log(ri->avctx, AV_LOG_ERROR, "Unknown vq code: %d\n", vqid);
157 if (xpos >= ri->width) {
161 if(ypos >= ri->height)
167 static av_cold int roq_decode_init(AVCodecContext *avctx)
169 RoqContext *s = avctx->priv_data;
172 s->width = avctx->width;
173 s->height = avctx->height;
174 avcodec_get_frame_defaults(&s->frames[0]);
175 avcodec_get_frame_defaults(&s->frames[1]);
176 s->last_frame = &s->frames[0];
177 s->current_frame = &s->frames[1];
178 avctx->pix_fmt = PIX_FMT_YUV444P;
183 static int roq_decode_frame(AVCodecContext *avctx,
184 void *data, int *data_size,
187 const uint8_t *buf = avpkt->data;
188 int buf_size = avpkt->size;
189 RoqContext *s = avctx->priv_data;
190 int copy= !s->current_frame->data[0];
192 if (avctx->reget_buffer(avctx, s->current_frame)) {
193 av_log(avctx, AV_LOG_ERROR, " RoQ: get_buffer() failed\n");
198 av_picture_copy((AVPicture*)s->current_frame, (AVPicture*)s->last_frame,
199 avctx->pix_fmt, avctx->width, avctx->height);
203 roqvideo_decode_frame(s);
205 *data_size = sizeof(AVFrame);
206 *(AVFrame*)data = *s->current_frame;
209 FFSWAP(AVFrame *, s->current_frame, s->last_frame);
214 static av_cold int roq_decode_end(AVCodecContext *avctx)
216 RoqContext *s = avctx->priv_data;
218 /* release the last frame */
219 if (s->last_frame->data[0])
220 avctx->release_buffer(avctx, s->last_frame);
221 if (s->current_frame->data[0])
222 avctx->release_buffer(avctx, s->current_frame);
227 AVCodec ff_roq_decoder = {
229 .type = AVMEDIA_TYPE_VIDEO,
231 .priv_data_size = sizeof(RoqContext),
232 .init = roq_decode_init,
233 .close = roq_decode_end,
234 .decode = roq_decode_frame,
235 .capabilities = CODEC_CAP_DR1,
236 .long_name = NULL_IF_CONFIG_SMALL("id RoQ video"),