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/
32 #include "libavutil/imgutils.h"
35 #include "bytestream.h"
39 static void roqvideo_decode_frame(RoqContext *ri)
41 unsigned int chunk_id = 0, chunk_arg = 0;
42 unsigned long chunk_size = 0;
43 int i, j, k, nv1, nv2, vqflg = 0, vqflg_pos = -1;
44 int vqid, xpos, ypos, xp, yp, x, y, mx, my;
45 int frame_stats[2][4] = {{0},{0}};
49 while (bytestream2_get_bytes_left(&ri->gb) >= 8) {
50 chunk_id = bytestream2_get_le16(&ri->gb);
51 chunk_size = bytestream2_get_le32(&ri->gb);
52 chunk_arg = bytestream2_get_le16(&ri->gb);
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] = bytestream2_get_byte(&ri->gb);
63 ri->cb2x2[i].y[1] = bytestream2_get_byte(&ri->gb);
64 ri->cb2x2[i].y[2] = bytestream2_get_byte(&ri->gb);
65 ri->cb2x2[i].y[3] = bytestream2_get_byte(&ri->gb);
66 ri->cb2x2[i].u = bytestream2_get_byte(&ri->gb);
67 ri->cb2x2[i].v = bytestream2_get_byte(&ri->gb);
69 for(i = 0; i < nv2; i++)
70 for(j = 0; j < 4; j++)
71 ri->cb4x4[i].idx[j] = bytestream2_get_byte(&ri->gb);
75 chunk_start = bytestream2_tell(&ri->gb);
77 while (bytestream2_tell(&ri->gb) < chunk_start + chunk_size) {
78 for (yp = ypos; yp < ypos + 16; yp += 8)
79 for (xp = xpos; xp < xpos + 16; xp += 8) {
81 vqflg = bytestream2_get_le16(&ri->gb);
84 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
85 frame_stats[0][vqid]++;
92 int byte = bytestream2_get_byte(&ri->gb);
93 mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8));
94 my = 8 - (byte & 0xf) - ((signed char) chunk_arg);
95 ff_apply_motion_8x8(ri, xp, yp, mx, my);
99 qcell = ri->cb4x4 + bytestream2_get_byte(&ri->gb);
100 ff_apply_vector_4x4(ri, xp, yp, ri->cb2x2 + qcell->idx[0]);
101 ff_apply_vector_4x4(ri, xp + 4, yp, ri->cb2x2 + qcell->idx[1]);
102 ff_apply_vector_4x4(ri, xp, yp + 4, ri->cb2x2 + qcell->idx[2]);
103 ff_apply_vector_4x4(ri, xp + 4, yp + 4, ri->cb2x2 + qcell->idx[3]);
106 for (k = 0; k < 4; k++) {
112 vqflg = bytestream2_get_le16(&ri->gb);
115 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
116 frame_stats[1][vqid]++;
122 int byte = bytestream2_get_byte(&ri->gb);
123 mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8));
124 my = 8 - (byte & 0xf) - ((signed char) chunk_arg);
125 ff_apply_motion_4x4(ri, x, y, mx, my);
129 qcell = ri->cb4x4 + bytestream2_get_byte(&ri->gb);
130 ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + qcell->idx[0]);
131 ff_apply_vector_2x2(ri, x + 2, y, ri->cb2x2 + qcell->idx[1]);
132 ff_apply_vector_2x2(ri, x, y + 2, ri->cb2x2 + qcell->idx[2]);
133 ff_apply_vector_2x2(ri, x + 2, y + 2, ri->cb2x2 + qcell->idx[3]);
136 ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
137 ff_apply_vector_2x2(ri, x + 2, y, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
138 ff_apply_vector_2x2(ri, x, y + 2, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
139 ff_apply_vector_2x2(ri, x + 2, y + 2, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
145 av_log(ri->avctx, AV_LOG_ERROR, "Unknown vq code: %d\n", vqid);
150 if (xpos >= ri->width) {
154 if(ypos >= ri->height)
160 static av_cold int roq_decode_init(AVCodecContext *avctx)
162 RoqContext *s = avctx->priv_data;
166 if (avctx->width % 16 || avctx->height % 16) {
167 avpriv_request_sample(avctx, "Dimensions not being a multiple of 16");
168 return AVERROR_PATCHWELCOME;
171 s->width = avctx->width;
172 s->height = avctx->height;
174 s->last_frame = av_frame_alloc();
175 s->current_frame = av_frame_alloc();
176 if (!s->current_frame || !s->last_frame) {
177 av_frame_free(&s->current_frame);
178 av_frame_free(&s->last_frame);
179 return AVERROR(ENOMEM);
182 avctx->pix_fmt = AV_PIX_FMT_YUV444P;
187 static int roq_decode_frame(AVCodecContext *avctx,
188 void *data, int *got_frame,
191 const uint8_t *buf = avpkt->data;
192 int buf_size = avpkt->size;
193 RoqContext *s = avctx->priv_data;
194 int copy = !s->current_frame->data[0] && s->last_frame->data[0];
197 if ((ret = ff_reget_buffer(avctx, s->current_frame)) < 0) {
198 av_log(avctx, AV_LOG_ERROR, " RoQ: get_buffer() failed\n");
203 ret = av_frame_copy(s->current_frame, s->last_frame);
208 bytestream2_init(&s->gb, buf, buf_size);
209 roqvideo_decode_frame(s);
211 if ((ret = av_frame_ref(data, s->current_frame)) < 0)
216 FFSWAP(AVFrame *, s->current_frame, s->last_frame);
221 static av_cold int roq_decode_end(AVCodecContext *avctx)
223 RoqContext *s = avctx->priv_data;
225 av_frame_free(&s->current_frame);
226 av_frame_free(&s->last_frame);
231 AVCodec ff_roq_decoder = {
233 .long_name = NULL_IF_CONFIG_SMALL("id RoQ video"),
234 .type = AVMEDIA_TYPE_VIDEO,
235 .id = AV_CODEC_ID_ROQ,
236 .priv_data_size = sizeof(RoqContext),
237 .init = roq_decode_init,
238 .close = roq_decode_end,
239 .decode = roq_decode_frame,
240 .capabilities = AV_CODEC_CAP_DR1,