2 * Copyright (C) 2003 the ffmpeg project
4 * This file is part of Libav.
6 * Libav 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 * Libav 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 Libav; 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"
37 static void roqvideo_decode_frame(RoqContext *ri)
39 unsigned int chunk_id = 0, chunk_arg = 0;
40 unsigned long chunk_size = 0;
41 int i, j, k, nv1, nv2, vqflg = 0, vqflg_pos = -1;
42 int vqid, xpos, ypos, xp, yp, x, y, mx, my;
43 int frame_stats[2][4] = {{0},{0}};
47 while (bytestream2_get_bytes_left(&ri->gb) >= 8) {
48 chunk_id = bytestream2_get_le16(&ri->gb);
49 chunk_size = bytestream2_get_le32(&ri->gb);
50 chunk_arg = bytestream2_get_le16(&ri->gb);
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] = bytestream2_get_byte(&ri->gb);
61 ri->cb2x2[i].y[1] = bytestream2_get_byte(&ri->gb);
62 ri->cb2x2[i].y[2] = bytestream2_get_byte(&ri->gb);
63 ri->cb2x2[i].y[3] = bytestream2_get_byte(&ri->gb);
64 ri->cb2x2[i].u = bytestream2_get_byte(&ri->gb);
65 ri->cb2x2[i].v = bytestream2_get_byte(&ri->gb);
67 for(i = 0; i < nv2; i++)
68 for(j = 0; j < 4; j++)
69 ri->cb4x4[i].idx[j] = bytestream2_get_byte(&ri->gb);
73 chunk_start = bytestream2_tell(&ri->gb);
75 while (bytestream2_tell(&ri->gb) < chunk_start + chunk_size) {
76 for (yp = ypos; yp < ypos + 16; yp += 8)
77 for (xp = xpos; xp < xpos + 16; xp += 8) {
79 vqflg = bytestream2_get_le16(&ri->gb);
82 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
83 frame_stats[0][vqid]++;
90 int byte = bytestream2_get_byte(&ri->gb);
91 mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8));
92 my = 8 - (byte & 0xf) - ((signed char) chunk_arg);
93 ff_apply_motion_8x8(ri, xp, yp, mx, my);
97 qcell = ri->cb4x4 + bytestream2_get_byte(&ri->gb);
98 ff_apply_vector_4x4(ri, xp, yp, ri->cb2x2 + qcell->idx[0]);
99 ff_apply_vector_4x4(ri, xp + 4, yp, ri->cb2x2 + qcell->idx[1]);
100 ff_apply_vector_4x4(ri, xp, yp + 4, ri->cb2x2 + qcell->idx[2]);
101 ff_apply_vector_4x4(ri, xp + 4, yp + 4, ri->cb2x2 + qcell->idx[3]);
104 for (k = 0; k < 4; k++) {
110 vqflg = bytestream2_get_le16(&ri->gb);
113 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
114 frame_stats[1][vqid]++;
120 int byte = bytestream2_get_byte(&ri->gb);
121 mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8));
122 my = 8 - (byte & 0xf) - ((signed char) chunk_arg);
123 ff_apply_motion_4x4(ri, x, y, mx, my);
127 qcell = ri->cb4x4 + bytestream2_get_byte(&ri->gb);
128 ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + qcell->idx[0]);
129 ff_apply_vector_2x2(ri, x + 2, y, ri->cb2x2 + qcell->idx[1]);
130 ff_apply_vector_2x2(ri, x, y + 2, ri->cb2x2 + qcell->idx[2]);
131 ff_apply_vector_2x2(ri, x + 2, y + 2, ri->cb2x2 + qcell->idx[3]);
134 ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
135 ff_apply_vector_2x2(ri, x + 2, y, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
136 ff_apply_vector_2x2(ri, x, y + 2, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
137 ff_apply_vector_2x2(ri, x + 2, y + 2, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
143 av_log(ri->avctx, AV_LOG_ERROR, "Unknown vq code: %d\n", vqid);
148 if (xpos >= ri->width) {
152 if(ypos >= ri->height)
158 static av_cold int roq_decode_init(AVCodecContext *avctx)
160 RoqContext *s = avctx->priv_data;
164 if (avctx->width % 16 || avctx->height % 16) {
165 av_log(avctx, AV_LOG_ERROR,
166 "Dimensions must be a multiple of 16\n");
167 return AVERROR_PATCHWELCOME;
170 s->width = avctx->width;
171 s->height = avctx->height;
173 s->last_frame = av_frame_alloc();
174 s->current_frame = av_frame_alloc();
175 if (!s->current_frame || !s->last_frame) {
176 av_frame_free(&s->current_frame);
177 av_frame_free(&s->last_frame);
178 return AVERROR(ENOMEM);
181 avctx->pix_fmt = AV_PIX_FMT_YUV444P;
186 static int roq_decode_frame(AVCodecContext *avctx,
187 void *data, int *got_frame,
190 const uint8_t *buf = avpkt->data;
191 int buf_size = avpkt->size;
192 RoqContext *s = avctx->priv_data;
193 int copy= !s->current_frame->data[0];
196 if ((ret = ff_reget_buffer(avctx, s->current_frame)) < 0) {
197 av_log(avctx, AV_LOG_ERROR, " RoQ: get_buffer() failed\n");
202 av_picture_copy((AVPicture*)s->current_frame, (AVPicture*)s->last_frame,
203 avctx->pix_fmt, avctx->width, avctx->height);
205 bytestream2_init(&s->gb, buf, buf_size);
206 roqvideo_decode_frame(s);
208 if ((ret = av_frame_ref(data, s->current_frame)) < 0)
213 FFSWAP(AVFrame *, s->current_frame, s->last_frame);
218 static av_cold int roq_decode_end(AVCodecContext *avctx)
220 RoqContext *s = avctx->priv_data;
222 av_frame_free(&s->current_frame);
223 av_frame_free(&s->last_frame);
228 AVCodec ff_roq_decoder = {
230 .long_name = NULL_IF_CONFIG_SMALL("id RoQ video"),
231 .type = AVMEDIA_TYPE_VIDEO,
232 .id = AV_CODEC_ID_ROQ,
233 .priv_data_size = sizeof(RoqContext),
234 .init = roq_decode_init,
235 .close = roq_decode_end,
236 .decode = roq_decode_frame,
237 .capabilities = CODEC_CAP_DR1,