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dv.c
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1 /*
2  * DV decoder
3  * Copyright (c) 2002 Fabrice Bellard
4  * Copyright (c) 2004 Roman Shaposhnik
5  *
6  * DV encoder
7  * Copyright (c) 2003 Roman Shaposhnik
8  *
9  * 50 Mbps (DVCPRO50) support
10  * Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com>
11  *
12  * 100 Mbps (DVCPRO HD) support
13  * Initial code by Daniel Maas <dmaas@maasdigital.com> (funded by BBC R&D)
14  * Final code by Roman Shaposhnik
15  *
16  * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
17  * of DV technical info.
18  *
19  * This file is part of FFmpeg.
20  *
21  * FFmpeg is free software; you can redistribute it and/or
22  * modify it under the terms of the GNU Lesser General Public
23  * License as published by the Free Software Foundation; either
24  * version 2.1 of the License, or (at your option) any later version.
25  *
26  * FFmpeg is distributed in the hope that it will be useful,
27  * but WITHOUT ANY WARRANTY; without even the implied warranty of
28  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
29  * Lesser General Public License for more details.
30  *
31  * You should have received a copy of the GNU Lesser General Public
32  * License along with FFmpeg; if not, write to the Free Software
33  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
34  */
35 
36 /**
37  * @file
38  * DV codec.
39  */
40 
41 #include "libavutil/internal.h"
42 #include "libavutil/pixdesc.h"
43 
44 #include "avcodec.h"
45 #include "dv.h"
46 #include "dvdata.h"
47 #include "internal.h"
48 #include "put_bits.h"
49 #include "simple_idct.h"
50 
51 /* XXX: also include quantization */
53 
54 static inline void dv_calc_mb_coordinates(const AVDVProfile *d, int chan,
55  int seq, int slot, uint16_t *tbl)
56 {
57  static const uint8_t off[] = { 2, 6, 8, 0, 4 };
58  static const uint8_t shuf1[] = { 36, 18, 54, 0, 72 };
59  static const uint8_t shuf2[] = { 24, 12, 36, 0, 48 };
60  static const uint8_t shuf3[] = { 18, 9, 27, 0, 36 };
61 
62  static const uint8_t l_start[] = { 0, 4, 9, 13, 18, 22, 27, 31, 36, 40 };
63  static const uint8_t l_start_shuffled[] = { 9, 4, 13, 0, 18 };
64 
65  static const uint8_t serpent1[] = {
66  0, 1, 2, 2, 1, 0,
67  0, 1, 2, 2, 1, 0,
68  0, 1, 2, 2, 1, 0,
69  0, 1, 2, 2, 1, 0,
70  0, 1, 2
71  };
72  static const uint8_t serpent2[] = {
73  0, 1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 0,
74  0, 1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 0,
75  0, 1, 2, 3, 4, 5
76  };
77 
78  static const uint8_t remap[][2] = {
79  { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, /* dummy */
80  { 0, 0 }, { 0, 1 }, { 0, 2 }, { 0, 3 }, { 10, 0 },
81  { 10, 1 }, { 10, 2 }, { 10, 3 }, { 20, 0 }, { 20, 1 },
82  { 20, 2 }, { 20, 3 }, { 30, 0 }, { 30, 1 }, { 30, 2 },
83  { 30, 3 }, { 40, 0 }, { 40, 1 }, { 40, 2 }, { 40, 3 },
84  { 50, 0 }, { 50, 1 }, { 50, 2 }, { 50, 3 }, { 60, 0 },
85  { 60, 1 }, { 60, 2 }, { 60, 3 }, { 70, 0 }, { 70, 1 },
86  { 70, 2 }, { 70, 3 }, { 0, 64 }, { 0, 65 }, { 0, 66 },
87  { 10, 64 }, { 10, 65 }, { 10, 66 }, { 20, 64 }, { 20, 65 },
88  { 20, 66 }, { 30, 64 }, { 30, 65 }, { 30, 66 }, { 40, 64 },
89  { 40, 65 }, { 40, 66 }, { 50, 64 }, { 50, 65 }, { 50, 66 },
90  { 60, 64 }, { 60, 65 }, { 60, 66 }, { 70, 64 }, { 70, 65 },
91  { 70, 66 }, { 0, 67 }, { 20, 67 }, { 40, 67 }, { 60, 67 }
92  };
93 
94  int i, k, m;
95  int x, y, blk;
96 
97  for (m = 0; m < 5; m++) {
98  switch (d->width) {
99  case 1440:
100  blk = (chan * 11 + seq) * 27 + slot;
101 
102  if (chan == 0 && seq == 11) {
103  x = m * 27 + slot;
104  if (x < 90) {
105  y = 0;
106  } else {
107  x = (x - 90) * 2;
108  y = 67;
109  }
110  } else {
111  i = (4 * chan + blk + off[m]) % 11;
112  k = (blk / 11) % 27;
113 
114  x = shuf1[m] + (chan & 1) * 9 + k % 9;
115  y = (i * 3 + k / 9) * 2 + (chan >> 1) + 1;
116  }
117  tbl[m] = (x << 1) | (y << 9);
118  break;
119  case 1280:
120  blk = (chan * 10 + seq) * 27 + slot;
121 
122  i = (4 * chan + (seq / 5) + 2 * blk + off[m]) % 10;
123  k = (blk / 5) % 27;
124 
125  x = shuf1[m] + (chan & 1) * 9 + k % 9;
126  y = (i * 3 + k / 9) * 2 + (chan >> 1) + 4;
127 
128  if (x >= 80) {
129  x = remap[y][0] + ((x - 80) << (y > 59));
130  y = remap[y][1];
131  }
132  tbl[m] = (x << 1) | (y << 9);
133  break;
134  case 960:
135  blk = (chan * 10 + seq) * 27 + slot;
136 
137  i = (4 * chan + (seq / 5) + 2 * blk + off[m]) % 10;
138  k = (blk / 5) % 27 + (i & 1) * 3;
139 
140  x = shuf2[m] + k % 6 + 6 * (chan & 1);
141  y = l_start[i] + k / 6 + 45 * (chan >> 1);
142  tbl[m] = (x << 1) | (y << 9);
143  break;
144  case 720:
145  switch (d->pix_fmt) {
146  case AV_PIX_FMT_YUV422P:
147  x = shuf3[m] + slot / 3;
148  y = serpent1[slot] +
149  ((((seq + off[m]) % d->difseg_size) << 1) + chan) * 3;
150  tbl[m] = (x << 1) | (y << 8);
151  break;
152  case AV_PIX_FMT_YUV420P:
153  x = shuf3[m] + slot / 3;
154  y = serpent1[slot] +
155  ((seq + off[m]) % d->difseg_size) * 3;
156  tbl[m] = (x << 1) | (y << 9);
157  break;
158  case AV_PIX_FMT_YUV411P:
159  i = (seq + off[m]) % d->difseg_size;
160  k = slot + ((m == 1 || m == 2) ? 3 : 0);
161 
162  x = l_start_shuffled[m] + k / 6;
163  y = serpent2[k] + i * 6;
164  if (x > 21)
165  y = y * 2 - i * 6;
166  tbl[m] = (x << 2) | (y << 8);
167  break;
168  }
169  default:
170  break;
171  }
172  }
173 }
174 
176 {
177  int j, i, c, s, p;
178 
179  p = i = 0;
180  for (c = 0; c < d->n_difchan; c++) {
181  for (s = 0; s < d->difseg_size; s++) {
182  p += 6;
183  for (j = 0; j < 27; j++) {
184  p += !(j % 3);
185  if (!(DV_PROFILE_IS_1080i50(d) && c != 0 && s == 11) &&
186  !(DV_PROFILE_IS_720p50(d) && s > 9)) {
187  dv_calc_mb_coordinates(d, c, s, j, &ctx->work_chunks[i].mb_coordinates[0]);
188  ctx->work_chunks[i++].buf_offset = p;
189  }
190  p += 5;
191  }
192  }
193  }
194 
195  return 0;
196 }
197 
199 {
200  DVVideoContext *s = avctx->priv_data;
201  static int done = 0;
202  int i, j;
203 
204  if (!done) {
205  VLC dv_vlc;
206  uint16_t new_dv_vlc_bits[NB_DV_VLC * 2];
207  uint8_t new_dv_vlc_len[NB_DV_VLC * 2];
208  uint8_t new_dv_vlc_run[NB_DV_VLC * 2];
209  int16_t new_dv_vlc_level[NB_DV_VLC * 2];
210 
211  done = 1;
212 
213  /* it's faster to include sign bit in a generic VLC parsing scheme */
214  for (i = 0, j = 0; i < NB_DV_VLC; i++, j++) {
215  new_dv_vlc_bits[j] = ff_dv_vlc_bits[i];
216  new_dv_vlc_len[j] = ff_dv_vlc_len[i];
217  new_dv_vlc_run[j] = ff_dv_vlc_run[i];
218  new_dv_vlc_level[j] = ff_dv_vlc_level[i];
219 
220  if (ff_dv_vlc_level[i]) {
221  new_dv_vlc_bits[j] <<= 1;
222  new_dv_vlc_len[j]++;
223 
224  j++;
225  new_dv_vlc_bits[j] = (ff_dv_vlc_bits[i] << 1) | 1;
226  new_dv_vlc_len[j] = ff_dv_vlc_len[i] + 1;
227  new_dv_vlc_run[j] = ff_dv_vlc_run[i];
228  new_dv_vlc_level[j] = -ff_dv_vlc_level[i];
229  }
230  }
231 
232  /* NOTE: as a trick, we use the fact the no codes are unused
233  * to accelerate the parsing of partial codes */
234  init_vlc(&dv_vlc, TEX_VLC_BITS, j, new_dv_vlc_len,
235  1, 1, new_dv_vlc_bits, 2, 2, 0);
236  av_assert1(dv_vlc.table_size == 1664);
237 
238  for (i = 0; i < dv_vlc.table_size; i++) {
239  int code = dv_vlc.table[i][0];
240  int len = dv_vlc.table[i][1];
241  int level, run;
242 
243  if (len < 0) { // more bits needed
244  run = 0;
245  level = code;
246  } else {
247  run = new_dv_vlc_run[code] + 1;
248  level = new_dv_vlc_level[code];
249  }
250  ff_dv_rl_vlc[i].len = len;
251  ff_dv_rl_vlc[i].level = level;
252  ff_dv_rl_vlc[i].run = run;
253  }
254  ff_free_vlc(&dv_vlc);
255  }
256 
257  s->avctx = avctx;
259 
260  return 0;
261 }
262 
int table_size
Definition: vlc.h:29
const char * s
Definition: avisynth_c.h:768
const uint8_t ff_dv_vlc_len[NB_DV_VLC]
Definition: dvdata.c:132
uint8_t run
Definition: svq3.c:206
#define blk(i)
Definition: sha.c:185
#define DV_PROFILE_IS_1080i50(p)
Definition: dv.h:80
AVCodecContext * avctx
Definition: dv.h:43
uint8_t
#define av_cold
Definition: attributes.h:82
int difseg_size
Definition: dv_profile.h:43
#define DV_PROFILE_IS_720p50(p)
Definition: dv.h:81
enum AVPixelFormat pix_fmt
Definition: dv_profile.h:50
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:2419
#define NB_DV_VLC
Definition: dvdata.h:29
const uint16_t ff_dv_vlc_bits[NB_DV_VLC]
Definition: dvdata.c:77
DVwork_chunk work_chunks[4 *12 *27]
Definition: dv.h:52
uint16_t mb_coordinates[5]
Definition: dv.h:37
#define init_vlc(vlc, nb_bits, nb_codes,bits, bits_wrap, bits_size,codes, codes_wrap, codes_size,flags)
Definition: vlc.h:38
int8_t len
Definition: vlc.h:34
Definition: vlc.h:26
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:66
common internal API header
#define av_assert1(cond)
assert() equivalent, that does not lie in speed critical code.
Definition: avassert.h:53
ITU-R 601, SMPTE 274M 296M S314M(DV 4:1:1), mpeg2 4:2:2.
Definition: pixfmt.h:485
AVFormatContext * ctx
Definition: movenc.c:48
RL_VLC_ELEM ff_dv_rl_vlc[1664]
Definition: dv.c:52
Libavcodec external API header.
static const int remap[16]
Definition: msvideo1enc.c:63
main external API structure.
Definition: avcodec.h:1675
av_cold int ff_dvvideo_init(AVCodecContext *avctx)
Definition: dv.c:198
uint8_t level
Definition: svq3.c:207
uint8_t run
Definition: vlc.h:35
static void dv_calc_mb_coordinates(const AVDVProfile *d, int chan, int seq, int slot, uint16_t *tbl)
Definition: dv.c:54
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:62
common internal api header.
#define TEX_VLC_BITS
Definition: dv.h:93
static double c[64]
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
Definition: pixfmt.h:69
Constants for DV codec.
int ff_dv_init_dynamic_tables(DVVideoContext *ctx, const AVDVProfile *d)
Definition: dv.c:175
uint16_t buf_offset
Definition: dv.h:36
void * priv_data
Definition: avcodec.h:1717
simple idct header.
int len
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
int16_t level
Definition: vlc.h:33
const uint8_t ff_dv_vlc_run[NB_DV_VLC]
Definition: dvdata.c:187
int n_difchan
Definition: dv_profile.h:44
void ff_free_vlc(VLC *vlc)
Definition: bitstream.c:360
const uint8_t ff_dv_vlc_level[NB_DV_VLC]
Definition: dvdata.c:242
bitstream writer API