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/
29 #include "bytestream.h"
32 static void roqvideo_decode_frame(RoqContext *ri)
34 unsigned int chunk_id = 0, chunk_arg = 0;
35 unsigned long chunk_size = 0;
36 int i, j, k, nv1, nv2, vqflg = 0, vqflg_pos = -1;
37 int vqid, xpos, ypos, xp, yp, x, y, mx, my;
38 int frame_stats[2][4] = {{0},{0}};
42 while (bytestream2_get_bytes_left(&ri->gb) >= 8) {
43 chunk_id = bytestream2_get_le16(&ri->gb);
44 chunk_size = bytestream2_get_le32(&ri->gb);
45 chunk_arg = bytestream2_get_le16(&ri->gb);
47 if(chunk_id == RoQ_QUAD_VQ)
49 if(chunk_id == RoQ_QUAD_CODEBOOK) {
50 if((nv1 = chunk_arg >> 8) == 0)
52 if((nv2 = chunk_arg & 0xff) == 0 && nv1 * 6 < chunk_size)
54 for(i = 0; i < nv1; i++) {
55 ri->cb2x2[i].y[0] = bytestream2_get_byte(&ri->gb);
56 ri->cb2x2[i].y[1] = bytestream2_get_byte(&ri->gb);
57 ri->cb2x2[i].y[2] = bytestream2_get_byte(&ri->gb);
58 ri->cb2x2[i].y[3] = bytestream2_get_byte(&ri->gb);
59 ri->cb2x2[i].u = bytestream2_get_byte(&ri->gb);
60 ri->cb2x2[i].v = bytestream2_get_byte(&ri->gb);
62 for(i = 0; i < nv2; i++)
63 for(j = 0; j < 4; j++)
64 ri->cb4x4[i].idx[j] = bytestream2_get_byte(&ri->gb);
68 chunk_start = bytestream2_tell(&ri->gb);
71 if (chunk_size > bytestream2_get_bytes_left(&ri->gb)) {
72 av_log(ri->avctx, AV_LOG_ERROR, "Chunk does not fit in input buffer\n");
73 chunk_size = bytestream2_get_bytes_left(&ri->gb);
76 while (bytestream2_tell(&ri->gb) < chunk_start + chunk_size) {
77 for (yp = ypos; yp < ypos + 16; yp += 8)
78 for (xp = xpos; xp < xpos + 16; xp += 8) {
79 if (bytestream2_tell(&ri->gb) >= chunk_start + chunk_size) {
80 av_log(ri->avctx, AV_LOG_ERROR, "Input buffer too small\n");
84 vqflg = bytestream2_get_le16(&ri->gb);
87 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
88 frame_stats[0][vqid]++;
95 int byte = bytestream2_get_byte(&ri->gb);
96 mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8));
97 my = 8 - (byte & 0xf) - ((signed char) chunk_arg);
98 ff_apply_motion_8x8(ri, xp, yp, mx, my);
102 qcell = ri->cb4x4 + bytestream2_get_byte(&ri->gb);
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 (bytestream2_tell(&ri->gb) >= chunk_start + chunk_size) {
115 av_log(ri->avctx, AV_LOG_ERROR, "Input buffer too small\n");
119 vqflg = bytestream2_get_le16(&ri->gb);
122 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
123 frame_stats[1][vqid]++;
129 int byte = bytestream2_get_byte(&ri->gb);
130 mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8));
131 my = 8 - (byte & 0xf) - ((signed char) chunk_arg);
132 ff_apply_motion_4x4(ri, x, y, mx, my);
136 qcell = ri->cb4x4 + bytestream2_get_byte(&ri->gb);
137 ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + qcell->idx[0]);
138 ff_apply_vector_2x2(ri, x + 2, y, ri->cb2x2 + qcell->idx[1]);
139 ff_apply_vector_2x2(ri, x, y + 2, ri->cb2x2 + qcell->idx[2]);
140 ff_apply_vector_2x2(ri, x + 2, y + 2, ri->cb2x2 + qcell->idx[3]);
143 ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
144 ff_apply_vector_2x2(ri, x + 2, y, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
145 ff_apply_vector_2x2(ri, x, y + 2, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
146 ff_apply_vector_2x2(ri, x + 2, y + 2, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
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 s->current_frame->reference = 3;
193 if (avctx->reget_buffer(avctx, s->current_frame)) {
194 av_log(avctx, AV_LOG_ERROR, " RoQ: get_buffer() failed\n");
199 av_picture_copy((AVPicture*)s->current_frame, (AVPicture*)s->last_frame,
200 avctx->pix_fmt, avctx->width, avctx->height);
202 bytestream2_init(&s->gb, buf, buf_size);
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,
230 .id = AV_CODEC_ID_ROQ,
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"),