Libav
roqvideodec.c
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1 /*
2  * Copyright (C) 2003 the ffmpeg project
3  *
4  * This file is part of Libav.
5  *
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.
10  *
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.
15  *
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
19  */
20 
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <string.h>
31 
32 #include "avcodec.h"
33 #include "bytestream.h"
34 #include "internal.h"
35 #include "roqvideo.h"
36 
38 {
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}};
44  roq_qcell *qcell;
45  int64_t chunk_start;
46 
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);
51 
52  if(chunk_id == RoQ_QUAD_VQ)
53  break;
54  if(chunk_id == RoQ_QUAD_CODEBOOK) {
55  if((nv1 = chunk_arg >> 8) == 0)
56  nv1 = 256;
57  if((nv2 = chunk_arg & 0xff) == 0 && nv1 * 6 < chunk_size)
58  nv2 = 256;
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);
66  }
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);
70  }
71  }
72 
73  chunk_start = bytestream2_tell(&ri->gb);
74  xpos = ypos = 0;
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) {
78  if (vqflg_pos < 0) {
79  vqflg = bytestream2_get_le16(&ri->gb);
80  vqflg_pos = 7;
81  }
82  vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
83  frame_stats[0][vqid]++;
84  vqflg_pos--;
85 
86  switch(vqid) {
87  case RoQ_ID_MOT:
88  break;
89  case RoQ_ID_FCC: {
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);
94  break;
95  }
96  case RoQ_ID_SLD:
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]);
102  break;
103  case RoQ_ID_CCC:
104  for (k = 0; k < 4; k++) {
105  x = xp; y = yp;
106  if(k & 0x01) x += 4;
107  if(k & 0x02) y += 4;
108 
109  if (vqflg_pos < 0) {
110  vqflg = bytestream2_get_le16(&ri->gb);
111  vqflg_pos = 7;
112  }
113  vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
114  frame_stats[1][vqid]++;
115  vqflg_pos--;
116  switch(vqid) {
117  case RoQ_ID_MOT:
118  break;
119  case RoQ_ID_FCC: {
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);
124  break;
125  }
126  case RoQ_ID_SLD:
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]);
132  break;
133  case RoQ_ID_CCC:
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));
138  break;
139  }
140  }
141  break;
142  default:
143  av_log(ri->avctx, AV_LOG_ERROR, "Unknown vq code: %d\n", vqid);
144  }
145  }
146 
147  xpos += 16;
148  if (xpos >= ri->width) {
149  xpos -= ri->width;
150  ypos += 16;
151  }
152  if(ypos >= ri->height)
153  break;
154  }
155 }
156 
157 
159 {
160  RoqContext *s = avctx->priv_data;
161 
162  s->avctx = avctx;
163 
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;
168  }
169 
170  s->width = avctx->width;
171  s->height = avctx->height;
172 
173  s->last_frame = av_frame_alloc();
175  if (!s->current_frame || !s->last_frame) {
178  return AVERROR(ENOMEM);
179  }
180 
181  avctx->pix_fmt = AV_PIX_FMT_YUV444P;
182 
183  return 0;
184 }
185 
187  void *data, int *got_frame,
188  AVPacket *avpkt)
189 {
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];
194  int ret;
195 
196  if ((ret = ff_reget_buffer(avctx, s->current_frame)) < 0) {
197  av_log(avctx, AV_LOG_ERROR, " RoQ: get_buffer() failed\n");
198  return ret;
199  }
200 
201  if(copy)
203  avctx->pix_fmt, avctx->width, avctx->height);
204 
205  bytestream2_init(&s->gb, buf, buf_size);
207 
208  if ((ret = av_frame_ref(data, s->current_frame)) < 0)
209  return ret;
210  *got_frame = 1;
211 
212  /* shuffle frames */
214 
215  return buf_size;
216 }
217 
219 {
220  RoqContext *s = avctx->priv_data;
221 
224 
225  return 0;
226 }
227 
229  .name = "roqvideo",
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),
237  .capabilities = CODEC_CAP_DR1,
238 };