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path: root/libavcodec/roqvideodec.c (plain)
blob: 0ab7d399d6750aa37835b25dedf3a77d547ab83e
1/*
2 * Copyright (C) 2003 The FFmpeg project
3 *
4 * This file is part of FFmpeg.
5 *
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.
10 *
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.
15 *
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
19 */
20
21/**
22 * @file
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/
26 */
27
28#include "libavutil/avassert.h"
29#include "libavutil/imgutils.h"
30
31#include "avcodec.h"
32#include "bytestream.h"
33#include "internal.h"
34#include "roqvideo.h"
35
36static void roqvideo_decode_frame(RoqContext *ri)
37{
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, xpos, ypos, xp, yp, x, y, mx, my;
42 int frame_stats[2][4] = {{0},{0}};
43 roq_qcell *qcell;
44 int64_t chunk_start;
45
46 while (bytestream2_get_bytes_left(&ri->gb) >= 8) {
47 chunk_id = bytestream2_get_le16(&ri->gb);
48 chunk_size = bytestream2_get_le32(&ri->gb);
49 chunk_arg = bytestream2_get_le16(&ri->gb);
50
51 if(chunk_id == RoQ_QUAD_VQ)
52 break;
53 if(chunk_id == RoQ_QUAD_CODEBOOK) {
54 if((nv1 = chunk_arg >> 8) == 0)
55 nv1 = 256;
56 if((nv2 = chunk_arg & 0xff) == 0 && nv1 * 6 < chunk_size)
57 nv2 = 256;
58 for(i = 0; i < nv1; i++) {
59 ri->cb2x2[i].y[0] = bytestream2_get_byte(&ri->gb);
60 ri->cb2x2[i].y[1] = bytestream2_get_byte(&ri->gb);
61 ri->cb2x2[i].y[2] = bytestream2_get_byte(&ri->gb);
62 ri->cb2x2[i].y[3] = bytestream2_get_byte(&ri->gb);
63 ri->cb2x2[i].u = bytestream2_get_byte(&ri->gb);
64 ri->cb2x2[i].v = bytestream2_get_byte(&ri->gb);
65 }
66 for(i = 0; i < nv2; i++)
67 for(j = 0; j < 4; j++)
68 ri->cb4x4[i].idx[j] = bytestream2_get_byte(&ri->gb);
69 }
70 }
71
72 chunk_start = bytestream2_tell(&ri->gb);
73 xpos = ypos = 0;
74
75 if (chunk_size > bytestream2_get_bytes_left(&ri->gb)) {
76 av_log(ri->avctx, AV_LOG_ERROR, "Chunk does not fit in input buffer\n");
77 chunk_size = bytestream2_get_bytes_left(&ri->gb);
78 }
79
80 while (bytestream2_tell(&ri->gb) < chunk_start + chunk_size) {
81 for (yp = ypos; yp < ypos + 16; yp += 8)
82 for (xp = xpos; xp < xpos + 16; xp += 8) {
83 if (bytestream2_tell(&ri->gb) >= chunk_start + chunk_size) {
84 av_log(ri->avctx, AV_LOG_VERBOSE, "Chunk is too short\n");
85 return;
86 }
87 if (vqflg_pos < 0) {
88 vqflg = bytestream2_get_le16(&ri->gb);
89 vqflg_pos = 7;
90 }
91 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
92 frame_stats[0][vqid]++;
93 vqflg_pos--;
94
95 switch(vqid) {
96 case RoQ_ID_MOT:
97 break;
98 case RoQ_ID_FCC: {
99 int byte = bytestream2_get_byte(&ri->gb);
100 mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8));
101 my = 8 - (byte & 0xf) - ((signed char) chunk_arg);
102 ff_apply_motion_8x8(ri, xp, yp, mx, my);
103 break;
104 }
105 case RoQ_ID_SLD:
106 qcell = ri->cb4x4 + bytestream2_get_byte(&ri->gb);
107 ff_apply_vector_4x4(ri, xp, yp, ri->cb2x2 + qcell->idx[0]);
108 ff_apply_vector_4x4(ri, xp + 4, yp, ri->cb2x2 + qcell->idx[1]);
109 ff_apply_vector_4x4(ri, xp, yp + 4, ri->cb2x2 + qcell->idx[2]);
110 ff_apply_vector_4x4(ri, xp + 4, yp + 4, ri->cb2x2 + qcell->idx[3]);
111 break;
112 case RoQ_ID_CCC:
113 for (k = 0; k < 4; k++) {
114 x = xp; y = yp;
115 if(k & 0x01) x += 4;
116 if(k & 0x02) y += 4;
117
118 if (bytestream2_tell(&ri->gb) >= chunk_start + chunk_size) {
119 av_log(ri->avctx, AV_LOG_VERBOSE, "Chunk is too short\n");
120 return;
121 }
122 if (vqflg_pos < 0) {
123 vqflg = bytestream2_get_le16(&ri->gb);
124 vqflg_pos = 7;
125 }
126 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
127 frame_stats[1][vqid]++;
128 vqflg_pos--;
129 switch(vqid) {
130 case RoQ_ID_MOT:
131 break;
132 case RoQ_ID_FCC: {
133 int byte = bytestream2_get_byte(&ri->gb);
134 mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8));
135 my = 8 - (byte & 0xf) - ((signed char) chunk_arg);
136 ff_apply_motion_4x4(ri, x, y, mx, my);
137 break;
138 }
139 case RoQ_ID_SLD:
140 qcell = ri->cb4x4 + bytestream2_get_byte(&ri->gb);
141 ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + qcell->idx[0]);
142 ff_apply_vector_2x2(ri, x + 2, y, ri->cb2x2 + qcell->idx[1]);
143 ff_apply_vector_2x2(ri, x, y + 2, ri->cb2x2 + qcell->idx[2]);
144 ff_apply_vector_2x2(ri, x + 2, y + 2, ri->cb2x2 + qcell->idx[3]);
145 break;
146 case RoQ_ID_CCC:
147 ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
148 ff_apply_vector_2x2(ri, x + 2, y, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
149 ff_apply_vector_2x2(ri, x, y + 2, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
150 ff_apply_vector_2x2(ri, x + 2, y + 2, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
151 break;
152 }
153 }
154 break;
155 default:
156 av_assert2(0);
157 }
158 }
159
160 xpos += 16;
161 if (xpos >= ri->width) {
162 xpos -= ri->width;
163 ypos += 16;
164 }
165 if(ypos >= ri->height)
166 break;
167 }
168}
169
170
171static av_cold int roq_decode_init(AVCodecContext *avctx)
172{
173 RoqContext *s = avctx->priv_data;
174
175 s->avctx = avctx;
176
177 if (avctx->width % 16 || avctx->height % 16) {
178 avpriv_request_sample(avctx, "Dimensions not being a multiple of 16");
179 return AVERROR_PATCHWELCOME;
180 }
181
182 s->width = avctx->width;
183 s->height = avctx->height;
184
185 s->last_frame = av_frame_alloc();
186 s->current_frame = av_frame_alloc();
187 if (!s->current_frame || !s->last_frame) {
188 av_frame_free(&s->current_frame);
189 av_frame_free(&s->last_frame);
190 return AVERROR(ENOMEM);
191 }
192
193 avctx->pix_fmt = AV_PIX_FMT_YUVJ444P;
194 avctx->color_range = AVCOL_RANGE_JPEG;
195
196 return 0;
197}
198
199static int roq_decode_frame(AVCodecContext *avctx,
200 void *data, int *got_frame,
201 AVPacket *avpkt)
202{
203 const uint8_t *buf = avpkt->data;
204 int buf_size = avpkt->size;
205 RoqContext *s = avctx->priv_data;
206 int copy = !s->current_frame->data[0] && s->last_frame->data[0];
207 int ret;
208
209 if ((ret = ff_reget_buffer(avctx, s->current_frame)) < 0)
210 return ret;
211
212 if (copy) {
213 ret = av_frame_copy(s->current_frame, s->last_frame);
214 if (ret < 0)
215 return ret;
216 }
217
218 bytestream2_init(&s->gb, buf, buf_size);
219 roqvideo_decode_frame(s);
220
221 if ((ret = av_frame_ref(data, s->current_frame)) < 0)
222 return ret;
223 *got_frame = 1;
224
225 /* shuffle frames */
226 FFSWAP(AVFrame *, s->current_frame, s->last_frame);
227
228 return buf_size;
229}
230
231static av_cold int roq_decode_end(AVCodecContext *avctx)
232{
233 RoqContext *s = avctx->priv_data;
234
235 av_frame_free(&s->current_frame);
236 av_frame_free(&s->last_frame);
237
238 return 0;
239}
240
241AVCodec ff_roq_decoder = {
242 .name = "roqvideo",
243 .long_name = NULL_IF_CONFIG_SMALL("id RoQ video"),
244 .type = AVMEDIA_TYPE_VIDEO,
245 .id = AV_CODEC_ID_ROQ,
246 .priv_data_size = sizeof(RoqContext),
247 .init = roq_decode_init,
248 .close = roq_decode_end,
249 .decode = roq_decode_frame,
250 .capabilities = AV_CODEC_CAP_DR1,
251};
252
generated by cgit at 2024-05-17 04:45:56 (GMT)