Revision 0d8d3ed5

View differences:

libavformat/dvcore.c
1
/* 
2
 * DV format muxer/demuxer
3
 * Copyright (c) 2003 Roman Shaposhnik
4
 *
5
 * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
6
 * of DV technical info.
7
 *
8
 * This library is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
11
 * version 2 of the License, or (at your option) any later version.
12
 *
13
 * This library is distributed in the hope that it will be useful,
14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16
 * Lesser General Public License for more details.
17
 *
18
 * You should have received a copy of the GNU Lesser General Public
19
 * License along with this library; if not, write to the Free Software
20
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
21
 */
22
#include "avformat.h"
23
#include "dvcore.h"
24

  
25
/*
26
 * The reason why the following three big ugly looking tables are
27
 * here is my lack of DV spec IEC 61834. The tables were basically 
28
 * constructed to make code that places packs in SSYB, VAUX and 
29
 * AAUX blocks very simple and table-driven. They conform to the
30
 * SMPTE 314M and the output of my personal DV camcorder, neither
31
 * of which is sufficient for a reliable DV stream producing. Thus
32
 * while code is still in development I'll be gathering input from
33
 * people with different DV equipment and modifying the tables to
34
 * accommodate all the quirks. Later on, if possible, some of them
35
 * will be folded into smaller tables and/or switch-if logic. For 
36
 * now, my only excuse is -- they don't eat up that much of a space.
37
 */
38

  
39
static const int dv_ssyb_packs_dist[12][6] = {
40
    { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
41
    { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
42
    { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
43
    { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
44
    { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
45
    { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
46
    { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
47
    { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
48
    { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
49
    { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
50
    { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
51
    { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
52
};
53

  
54
static const int dv_vaux_packs_dist[12][15] = {
55
    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
56
      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
57
    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
58
      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
59
    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
60
      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
61
    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
62
      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
63
    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
64
      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
65
    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
66
      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
67
    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
68
      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
69
    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
70
      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
71
    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
72
      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
73
    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
74
      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
75
    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
76
      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
77
    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
78
      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
79
};
80

  
81
static const int dv_aaux_packs_dist[12][9] = {
82
    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
83
    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
84
    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
85
    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
86
    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
87
    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
88
    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
89
    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
90
    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
91
    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
92
    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
93
    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
94
};
95

  
96
enum dv_section_type {
97
     dv_sect_header  = 0x1f,
98
     dv_sect_subcode = 0x3f,
99
     dv_sect_vaux    = 0x56,
100
     dv_sect_audio   = 0x76,
101
     dv_sect_video   = 0x96,
102
};
103

  
104
enum dv_pack_type {
105
     dv_header525     = 0x3f, /* see dv_write_pack for important details on */ 
106
     dv_header625     = 0xbf, /* these two packs */
107
     dv_timecode      = 0x13,
108
     dv_audio_source  = 0x50,
109
     dv_audio_control = 0x51,
110
     dv_audio_recdate = 0x52,
111
     dv_audio_rectime = 0x53,
112
     dv_video_source  = 0x60,
113
     dv_video_control = 0x61,
114
     dv_viedo_recdate = 0x62,
115
     dv_video_rectime = 0x63,
116
     dv_unknown_pack  = 0xff,
117
};
118

  
119
static const uint16_t dv_audio_shuffle525[10][9] = {
120
  {  0, 30, 60, 20, 50, 80, 10, 40, 70 }, /* 1st channel */
121
  {  6, 36, 66, 26, 56, 86, 16, 46, 76 },
122
  { 12, 42, 72,  2, 32, 62, 22, 52, 82 },
123
  { 18, 48, 78,  8, 38, 68, 28, 58, 88 },
124
  { 24, 54, 84, 14, 44, 74,  4, 34, 64 },
125
  
126
  {  1, 31, 61, 21, 51, 81, 11, 41, 71 }, /* 2nd channel */
127
  {  7, 37, 67, 27, 57, 87, 17, 47, 77 },
128
  { 13, 43, 73,  3, 33, 63, 23, 53, 83 },
129
  { 19, 49, 79,  9, 39, 69, 29, 59, 89 },
130
  { 25, 55, 85, 15, 45, 75,  5, 35, 65 },
131
};
132

  
133
static const uint16_t dv_audio_shuffle625[12][9] = {
134
  {   0,  36,  72,  26,  62,  98,  16,  52,  88}, /* 1st channel */
135
  {   6,  42,  78,  32,  68, 104,  22,  58,  94},
136
  {  12,  48,  84,   2,  38,  74,  28,  64, 100},
137
  {  18,  54,  90,   8,  44,  80,  34,  70, 106},
138
  {  24,  60,  96,  14,  50,  86,   4,  40,  76},  
139
  {  30,  66, 102,  20,  56,  92,  10,  46,  82},
140
	
141
  {   1,  37,  73,  27,  63,  99,  17,  53,  89}, /* 2nd channel */
142
  {   7,  43,  79,  33,  69, 105,  23,  59,  95},
143
  {  13,  49,  85,   3,  39,  75,  29,  65, 101},
144
  {  19,  55,  91,   9,  45,  81,  35,  71, 107},
145
  {  25,  61,  97,  15,  51,  87,   5,  41,  77},  
146
  {  31,  67, 103,  21,  57,  93,  11,  47,  83},
147
};
148

  
149
static const int dv_audio_frequency[3] = {
150
    48000, 44100, 32000,
151
};
152
    
153
const DVprofile dv_profiles[2] = {
154
    { .dsf = 0,
155
      .frame_size = 120000,        /* 525/60 system (NTSC) */
156
      .difseg_size = 10,
157
      .frame_rate = 30000,
158
      .ltc_divisor = 30,
159
      .frame_rate_base = 1001,
160
      .height = 480,
161
/*    .video_place = dv_place_411, */
162
      .audio_stride = 90,
163
      .audio_min_samples = { 1580, 1452, 1053 }, /* for 48, 44.1 and 32Khz */
164
      .audio_samples_dist = { 1602, 1601, 1602, 1601, 1602 },
165
      .audio_shuffle = dv_audio_shuffle525,
166
    }, 
167
    { .dsf = 1,
168
      .frame_size = 144000,        /* 625/50 system (PAL) */
169
      .difseg_size = 12,
170
      .frame_rate = 25,
171
      .frame_rate_base = 1,
172
      .ltc_divisor = 25,
173
      .height = 576,
174
/*    .video_place = dv_place_420, */
175
      .audio_stride = 108,
176
      .audio_min_samples = { 1896, 1742, 1264 }, /* for 48, 44.1 and 32Khz */
177
      .audio_samples_dist = { 1920, 1920, 1920, 1920, 1920 },
178
      .audio_shuffle = dv_audio_shuffle525,
179
     }
180
};
181

  
182
static inline uint16_t dv_audio_12to16(uint16_t sample)
183
{
184
    uint16_t shift, result;
185
    
186
    sample = (sample < 0x800) ? sample : sample | 0xf000;
187
    shift = (sample & 0xf00) >> 8;
188

  
189
    if (shift < 0x2 || shift > 0xd) {
190
	result = sample;
191
    } else if (shift < 0x8) {
192
        shift--;
193
	result = (sample - (256 * shift)) << shift;
194
    } else {
195
	shift = 0xe - shift;
196
	result = ((sample + ((256 * shift) + 1)) << shift) - 1;
197
    }
198

  
199
    return result;
200
}
201

  
202
static int dv_write_pack(enum dv_pack_type pack_id, DVMuxContext *c, uint8_t* buf)
203
{
204
    struct tm tc;
205
    time_t ct;
206
    int ltc_frame;
207

  
208
    buf[0] = (uint8_t)pack_id;
209
    switch (pack_id) {
210
    case dv_header525: /* I can't imagine why these two weren't defined as real */
211
    case dv_header625: /* packs in SMPTE314M -- they definitely look like ones */
212
          buf[1] = 0xf8 |               /* reserved -- always 1 */
213
	           (0 & 0x07);          /* APT: Track application ID */
214
          buf[2] = (0 << 7)    | /* TF1: audio data is 0 - valid; 1 - invalid */
215
	           (0x0f << 3) | /* reserved -- always 1 */
216
		   (0 & 0x07);   /* AP1: Audio application ID */
217
          buf[3] = (0 << 7)    | /* TF2: video data is 0 - valid; 1 - invalid */  
218
	           (0x0f << 3) | /* reserved -- always 1 */
219
		   (0 & 0x07);   /* AP2: Video application ID */
220
          buf[4] = (0 << 7)    | /* TF3: subcode(SSYB) is 0 - valid; 1 - invalid */ 
221
	           (0x0f << 3) | /* reserved -- always 1 */
222
		   (0 & 0x07);   /* AP3: Subcode application ID */
223
	  break;
224
    case dv_timecode:
225
          ct = (time_t)(c->frames / ((float)c->sys->frame_rate / 
226
                                     (float)c->sys->frame_rate_base));
227
          localtime_r(&ct, &tc);
228
          /* 
229
           * LTC drop-frame frame counter drops two frames (0 and 1) every 
230
           * minute, unless it is exactly divisible by 10
231
           */
232
          ltc_frame = (c->frames + 2*ct/60 - 2*ct/600) % c->sys->ltc_divisor;
233
	  buf[1] = (0 << 7) | /* Color fame: 0 - unsync; 1 - sync mode */
234
		   (1 << 6) | /* Drop frame timecode: 0 - nondrop; 1 - drop */
235
		   ((ltc_frame / 10) << 4) | /* Tens of frames */
236
		   (ltc_frame % 10);         /* Units of frames */
237
	  buf[2] = (1 << 7) | /* Biphase mark polarity correction: 0 - even; 1 - odd */
238
		   ((tc.tm_sec / 10) << 4) | /* Tens of seconds */
239
		   (tc.tm_sec % 10);         /* Units of seconds */
240
	  buf[3] = (1 << 7) | /* Binary group flag BGF0 */
241
		   ((tc.tm_min / 10) << 4) | /* Tens of minutes */
242
		   (tc.tm_min % 10);         /* Units of minutes */
243
	  buf[4] = (1 << 7) | /* Binary group flag BGF2 */
244
		   (1 << 6) | /* Binary group flag BGF1 */
245
	           ((tc.tm_hour / 10) << 4) | /* Tens of hours */
246
		   (tc.tm_hour % 10);         /* Units of hours */
247
          break;
248
    case dv_audio_source:  /* AAUX source pack */
249
          buf[1] = (0 << 7) | /* locked mode       */
250
                   (1 << 6) | /* reserved -- always 1 */
251
	           (dv_audio_frame_size(c->sys, c->frames) -
252
		    c->sys->audio_min_samples[0]);
253
	                      /* # of samples      */
254
          buf[2] = (0 << 7) | /* multi-stereo      */
255
                   (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */
256
                   (0 << 4) | /* pair bit: 0 -- one pair of channels */
257
	            0;        /* audio mode        */
258
          buf[3] = (1 << 7) | /* res               */
259
                   (1 << 6) | /* multi-language flag */
260
	           (c->sys->dsf << 5) | /*  system: 60fields/50fields */
261
	            0;        /* definition: 0 -- SD (525/625) */
262
          buf[4] = (1 << 7) | /* emphasis: 1 -- off */
263
                   (0 << 6) | /* emphasis time constant: 0 -- reserved */
264
	           (0 << 3) | /* frequency: 0 -- 48Khz, 1 -- 44,1Khz, 2 -- 32Khz */
265
                    0;        /* quantization: 0 -- 16bit linear, 1 -- 12bit nonlinear */			    
266
          break;
267
    case dv_audio_control:
268
          buf[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */
269
                   (1 << 4) | /* input source: 1 -- digital input */
270
	           (3 << 2) | /* compression: 3 -- no information */
271
	            0;        /* misc. info/SMPTE emphasis off */
272
          buf[2] = (1 << 7) | /* recording start point: 1 -- no */
273
                   (1 << 6) | /* recording end point: 1 -- no */
274
	           (1 << 3) | /* recording mode: 1 -- original */
275
	            7;         
276
          buf[3] = (1 << 7) | /* direction: 1 -- forward */
277
                    0x20;     /* speed */
278
          buf[4] = (1 << 7) | /* reserved -- always 1 */
279
                    0x7f;     /* genre category */
280
	  break;
281
    case dv_audio_recdate:
282
    case dv_viedo_recdate:  /* VAUX recording date */
283
          ct = c->start_time + (time_t)(c->frames / 
284
	       ((float)c->sys->frame_rate / (float)c->sys->frame_rate_base));
285
          localtime_r(&ct, &tc);
286
	  buf[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */
287
	                 /* 0xff is very likely to be "unknown" */
288
	  buf[2] = (3 << 6) | /* reserved -- always 1 */
289
		   ((tc.tm_mday / 10) << 4) | /* Tens of day */
290
		   (tc.tm_mday % 10);         /* Units of day */
291
	  buf[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */
292
		   (tc.tm_mon % 10);         /* Units of month */
293
	  buf[4] = (((tc.tm_year % 100) / 10) << 4) | /* Tens of year */
294
		   (tc.tm_year % 10);                 /* Units of year */
295
          break;
296
    case dv_audio_rectime:  /* AAUX recording time */
297
    case dv_video_rectime:  /* VAUX recording time */
298
          ct = c->start_time + (time_t)(c->frames / 
299
	       ((float)c->sys->frame_rate / (float)c->sys->frame_rate_base));
300
          localtime_r(&ct, &tc);
301
	  buf[1] = (3 << 6) | /* reserved -- always 1 */
302
		   0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */
303
	  buf[2] = (1 << 7) | /* reserved -- always 1 */ 
304
		   ((tc.tm_sec / 10) << 4) | /* Tens of seconds */
305
		   (tc.tm_sec % 10);         /* Units of seconds */
306
	  buf[3] = (1 << 7) | /* reserved -- always 1 */
307
		   ((tc.tm_min / 10) << 4) | /* Tens of minutes */
308
		   (tc.tm_min % 10);         /* Units of minutes */
309
	  buf[4] = (3 << 6) | /* reserved -- always 1 */ 
310
	           ((tc.tm_hour / 10) << 4) | /* Tens of hours */
311
		   (tc.tm_hour % 10);         /* Units of hours */
312
	  break;
313
    case dv_video_source:
314
	  buf[1] = 0xff; /* reserved -- always 1 */
315
	  buf[2] = (1 << 7) | /* B/W: 0 - b/w, 1 - color */
316
		   (1 << 6) | /* following CLF is valid - 0, invalid - 1 */
317
		   (3 << 4) | /* CLF: color frames id (see ITU-R BT.470-4) */
318
		   0xf; /* reserved -- always 1 */
319
	  buf[3] = (3 << 6) | /* reserved -- always 1 */
320
		   (c->sys->dsf << 5) | /*  system: 60fields/50fields */
321
		   0; /* signal type video compression */
322
	  buf[4] = 0xff; /* VISC: 0xff -- no information */
323
          break;
324
    case dv_video_control:
325
	  buf[1] = (0 << 6) | /* Copy generation management (CGMS) 0 -- free */
326
		   0x3f; /* reserved -- always 1 */
327
	  buf[2] = 0xc8 | /* reserved -- always b11001xxx */
328
		   c->aspect;
329
	  buf[3] = (1 << 7) | /* Frame/field flag 1 -- frame, 0 -- field */
330
		   (1 << 6) | /* First/second field flag 0 -- field 2, 1 -- field 1 */
331
		   (1 << 5) | /* Frame change flag 0 -- same picture as before, 1 -- different */
332
		   (1 << 4) | /* 1 - interlaced, 0 - noninterlaced */
333
		   0xc; /* reserved -- always b1100 */
334
	  buf[4] = 0xff; /* reserved -- always 1 */
335
          break;
336
    default:
337
          buf[1] = buf[2] = buf[3] = buf[4] = 0xff;
338
    }
339
    return 5;
340
}
341

  
342
static inline int dv_write_dif_id(enum dv_section_type t, uint8_t seq_num, 
343
                                  uint8_t dif_num, uint8_t* buf)
344
{
345
    buf[0] = (uint8_t)t;    /* Section type */
346
    buf[1] = (seq_num<<4) | /* DIF seq number 0-9 for 525/60; 0-11 for 625/50 */
347
	     (0 << 3) |     /* FSC: for 50Mb/s 0 - first channel; 1 - second */
348
	     7;             /* reserved -- always 1 */
349
    buf[2] = dif_num;       /* DIF block number Video: 0-134, Audio: 0-8 */
350
    return 3;
351
}
352

  
353
static inline int dv_write_ssyb_id(uint8_t syb_num, uint8_t fr, uint8_t* buf)
354
{
355
    if (syb_num == 0 || syb_num == 6) {
356
	buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
357
		 (0<<4)  | /* AP3 (Subcode application ID) */
358
		 0x0f;     /* reserved -- always 1 */
359
    } 
360
    else if (syb_num == 11) {
361
	buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
362
                 0x7f;     /* reserved -- always 1 */
363
    }
364
    else {
365
	buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
366
                 (0<<4)  | /* APT (Track application ID) */
367
		 0x0f;     /* reserved -- always 1 */
368
    }
369
    buf[1] = 0xf0 |            /* reserved -- always 1 */
370
             (syb_num & 0x0f); /* SSYB number 0 - 11   */
371
    buf[2] = 0xff;             /* reserved -- always 1 */
372
    return 3;
373
}
374

  
375
void dv_format_frame(DVMuxContext *c, uint8_t* buf)
376
{
377
    int i, j, k;
378
    
379
    for (i = 0; i < c->sys->difseg_size; i++) {
380
       memset(buf, 0xff, 80 * 6); /* First 6 DIF blocks are for control data */
381
       
382
       /* DV header: 1DIF */
383
       buf += dv_write_dif_id(dv_sect_header, i, 0, buf);
384
       buf += dv_write_pack((c->sys->dsf ? dv_header625 : dv_header525), c, buf);
385
       buf += 72; /* unused bytes */
386
				   
387
       /* DV subcode: 2DIFs */
388
       for (j = 0; j < 2; j++) {
389
          buf += dv_write_dif_id( dv_sect_subcode, i, j, buf);
390
	  for (k = 0; k < 6; k++) {
391
	     buf += dv_write_ssyb_id(k, (i < c->sys->difseg_size/2), buf);
392
	     buf += dv_write_pack(dv_ssyb_packs_dist[i][k], c, buf);
393
	  }
394
	  buf += 29; /* unused bytes */
395
       }
396
       
397
       /* DV VAUX: 3DIFs */
398
       for (j = 0; j < 3; j++) {
399
	  buf += dv_write_dif_id(dv_sect_vaux, i, j, buf);
400
	  for (k = 0; k < 15 ; k++)
401
	     buf += dv_write_pack(dv_vaux_packs_dist[i][k], c, buf);
402
	  buf += 2; /* unused bytes */
403
       } 
404
       
405
       /* DV Audio/Video: 135 Video DIFs + 9 Audio DIFs */
406
       for (j = 0; j < 135; j++) {
407
            if (j%15 == 0) {
408
	        buf += dv_write_dif_id(dv_sect_audio, i, j/15, buf);
409
	        buf += dv_write_pack(dv_aaux_packs_dist[i][j/15], c, buf);
410
		buf += 72; /* shuffled PCM audio */
411
	    }
412
	    buf += dv_write_dif_id(dv_sect_video, i, j, buf);
413
	    buf += 77; /* 1 video macro block: 1 bytes control
414
			                       4 * 14 bytes Y 8x8 data
415
			                           10 bytes Cr 8x8 data
416
						   10 bytes Cb 8x8 data */
417
       }
418
    }
419
}
420

  
421
void dv_inject_audio(DVMuxContext *c, const uint8_t* pcm, uint8_t* frame_ptr)
422
{
423
    int i, j, d, of;
424
    for (i = 0; i < c->sys->difseg_size; i++) {
425
       frame_ptr += 6 * 80; /* skip DIF segment header */
426
       for (j = 0; j < 9; j++) {
427
          for (d = 8; d < 80; d+=2) {
428
	     of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride;
429
	     frame_ptr[d] = pcm[of*2+1]; // FIXME: may be we have to admit
430
	     frame_ptr[d+1] = pcm[of*2]; //        that DV is a big endian PCM       
431
          }
432
          frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
433
       }
434
    }
435
}
436

  
437
void dv_inject_video(DVMuxContext *c, const uint8_t* video_data, uint8_t* frame_ptr)
438
{
439
    int i, j;
440
    int ptr = 0;
441

  
442
    for (i = 0; i < c->sys->difseg_size; i++) {
443
       ptr += 6 * 80; /* skip DIF segment header */
444
       for (j = 0; j < 135; j++) {
445
            if (j%15 == 0)
446
	        ptr += 80; /* skip Audio DIF */
447
	    ptr += 3;
448
	    memcpy(frame_ptr + ptr, video_data + ptr, 77);
449
	    ptr += 77;
450
       }
451
    }
452
}
453

  
454
int dv_audio_frame_size(const DVprofile* sys, int frame)
455
{
456
    return sys->audio_samples_dist[frame % (sizeof(sys->audio_samples_dist)/
457
		                            sizeof(sys->audio_samples_dist[0]))];
458
}
459

  
460
const DVprofile* dv_frame_profile(uint8_t* frame)
461
{
462
    return &dv_profiles[!!(frame[3] & 0x80)]; /* Header, DSF flag */
463
}
464

  
465
/* 
466
 * This is the dumbest implementation of all -- it simply looks at
467
 * a fixed offset and if pack isn't there -- fails. We might want
468
 * to have a fallback mechanism for complete search of missing packs.
469
 */
470
const uint8_t* dv_extract_pack(uint8_t* frame, enum dv_pack_type t)
471
{
472
    int offs;
473
    
474
    switch (t) {
475
    case dv_audio_source:
476
          offs = (80*6 + 80*16*3 + 3);
477
	  break;
478
    case dv_audio_control:
479
          offs = (80*6 + 80*16*4 + 3);
480
	  break;
481
    case dv_video_control:
482
          offs = (80*5 + 48 + 5);
483
          break;
484
    default:
485
          return NULL;
486
    }   
487

  
488
    return (frame[offs] == t ? &frame[offs] : NULL);
489
}
490

  
491
/* 
492
 * There's a couple of assumptions being made here:
493
 * 1. By default we silence erroneous (0x8000/16bit 0x800/12bit) audio samples.
494
 *    We can pass them upwards when ffmpeg will be ready to deal with them.
495
 * 2. We don't do software emphasis.
496
 * 3. Audio is always returned as 16bit linear samples: 12bit nonlinear samples
497
 *    are converted into 16bit linear ones.
498
 */
499
int dv_extract_audio(uint8_t* frame, uint8_t* pcm, AVCodecContext* avctx)
500
{
501
    int size, i, j, d, of, smpls, freq, quant;
502
    uint16_t lc, rc;
503
    const DVprofile* sys;
504
    const uint8_t* as_pack;
505
    
506
    as_pack = dv_extract_pack(frame, dv_audio_source);
507
    if (!as_pack)    /* No audio ? */
508
	return 0;
509
   
510
    sys = dv_frame_profile(frame);
511
    smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */
512
    freq = (as_pack[4] >> 3) & 0x07; /* 0 - 48KHz, 1 - 44,1kHz, 2 - 32 kHz */
513
    quant = as_pack[4] & 0x07; /* 0 - 16bit linear, 1 - 12bit nonlinear */
514
    
515
    if (quant > 1)
516
	return -1; /* Unsupported quantization */
517

  
518
    avctx->sample_rate = dv_audio_frequency[freq];
519
    avctx->channels = 2;
520
    avctx->bit_rate = avctx->channels * avctx->sample_rate * 16;
521
    // What about:
522
    // avctx->frame_size =
523
   
524
    size = (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */
525

  
526
    /* for each DIF segment */
527
    for (i = 0; i < sys->difseg_size; i++) {
528
       frame += 6 * 80; /* skip DIF segment header */
529
       for (j = 0; j < 9; j++) {
530
          for (d = 8; d < 80; d += 2) {
531
	     if (quant == 0) {  /* 16bit quantization */
532
		 of = sys->audio_shuffle[i][j] + (d - 8)/2 * sys->audio_stride;
533
		 pcm[of*2] = frame[d+1]; // FIXME: may be we have to admit
534
		 pcm[of*2+1] = frame[d]; //        that DV is a big endian PCM
535
		 if (pcm[of*2+1] == 0x80 && pcm[of*2] == 0x00)
536
		     pcm[of*2+1] = 0;
537
	      } else {           /* 12bit quantization */
538
		 if (i >= sys->difseg_size/2)
539
	             goto out;  /* We're not doing 4ch at this time */
540
		       
541
		 lc = ((uint16_t)frame[d] << 4) | 
542
		      ((uint16_t)frame[d+2] >> 4);
543
		 rc = ((uint16_t)frame[d+1] << 4) |
544
	              ((uint16_t)frame[d+2] & 0x0f);
545
		 lc = (lc == 0x800 ? 0 : dv_audio_12to16(lc));
546
		 rc = (rc == 0x800 ? 0 : dv_audio_12to16(rc));
547

  
548
		 of = sys->audio_shuffle[i][j] + (d - 8)/3 * sys->audio_stride;
549
		 pcm[of*2] = lc & 0xff; // FIXME: may be we have to admit
550
		 pcm[of*2+1] = lc >> 8; //        that DV is a big endian PCM
551
		 of = sys->audio_shuffle[i+sys->difseg_size/2][j] + 
552
		      (d - 8)/3 * sys->audio_stride;
553
		 pcm[of*2] = rc & 0xff; // FIXME: may be we have to admit
554
		 pcm[of*2+1] = rc >> 8; //        that DV is a big endian PCM
555
		 ++d;
556
	      }
557
	  }
558
		
559
	  frame += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
560
        }
561
    }
562

  
563
out:
564
    return size;
565
}
566

  
567
/* FIXME: The following three functions could be underengineered ;-) */
568
void dv_assemble_frame(DVMuxContext *c, const uint8_t* video, const uint8_t* audio, int asize)
569
{
570
    uint8_t pcm[8192];
571
    uint8_t* frame = &c->frame_buf[0];
572
    int fsize, reqasize;
573
   
574
    if (c->has_audio && c->has_video) {  /* must be a stale frame */
575
        dv_format_frame(c, frame);
576
	c->frames++;
577
	c->has_audio = c->has_video = 0;
578
    }
579
    
580
    if (video) {
581
        /* FIXME: we have to have more sensible approach than this one */
582
	if (c->has_video)
583
	    fprintf(stderr, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames);
584
	    
585
        dv_inject_video(c, video, frame);
586
	c->has_video = 1;
587
    } 
588
    if (audio) {
589
        reqasize = 4 * dv_audio_frame_size(c->sys, c->frames);
590
        fsize = fifo_size(&c->audio_data, c->audio_data.rptr);
591
	if (fsize + asize >= reqasize) {
592
            if (fsize >= reqasize) {
593
	        fifo_read(&c->audio_data, &pcm[0], reqasize, &c->audio_data.rptr);
594
            } else {
595
	        fifo_read(&c->audio_data, &pcm[0], fsize, &c->audio_data.rptr);
596
                memcpy(&pcm[fsize], &audio[0], reqasize - fsize);
597
		audio += reqasize - fsize;
598
		asize -= reqasize - fsize;
599
	    }
600
	    dv_inject_audio(c, &pcm[0], frame);
601
	    c->has_audio = 1;
602
	}
603
    
604
        /* FIXME: we have to have more sensible approach than this one */
605
        if (fifo_size(&c->audio_data, c->audio_data.rptr) + asize >= AVCODEC_MAX_AUDIO_FRAME_SIZE)
606
	    fprintf(stderr, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames);
607
	fifo_write(&c->audio_data, (uint8_t *)audio, asize, &c->audio_data.wptr);
608
    }
609
}
610

  
611
int dv_core_init(DVMuxContext *c, AVStream *streams[])
612
{
613
    /* We have to sort out where audio and where video stream is */
614
    if (streams[0]->codec.codec_type == CODEC_TYPE_VIDEO &&
615
        streams[1]->codec.codec_type == CODEC_TYPE_AUDIO) {
616
       c->vst = 0;
617
       c->ast = 1;
618
    }
619
    else if (streams[1]->codec.codec_type == CODEC_TYPE_VIDEO &&
620
             streams[0]->codec.codec_type == CODEC_TYPE_AUDIO) {
621
	    c->vst = 1;
622
 	    c->ast = 0;
623
    } else
624
        goto bail_out;
625
  
626
    /* Some checks -- DV format is very picky about its incoming streams */
627
    if (streams[c->vst]->codec.codec_id != CODEC_ID_DVVIDEO ||
628
	streams[c->ast]->codec.codec_id != CODEC_ID_PCM_S16LE)
629
       goto bail_out;
630
    if (streams[c->ast]->codec.sample_rate != 48000 ||
631
	streams[c->ast]->codec.channels != 2)
632
       goto bail_out;
633
	
634
    if (streams[c->vst]->codec.frame_rate == 25 &&
635
        streams[c->vst]->codec.frame_rate_base == 1) {
636
        /* May be we have to pick sys for every frame */
637
	c->sys = &dv_profiles[1];
638
    }
639
    else if (streams[c->vst]->codec.frame_rate == 30000 &&
640
             streams[c->vst]->codec.frame_rate_base == 1001) {
641
	/* May be we have to pick sys for every frame */
642
	c->sys = &dv_profiles[0];
643
    } else
644
        goto bail_out;
645
    
646
    /* Ok, everything seems to be in working order */
647
    c->frames = 0;
648
    c->has_audio = c->has_video = 0;
649
    c->start_time = time(NULL);
650
    c->aspect = 0; /* 4:3 is the default */
651
    if (streams[c->vst]->codec.aspect_ratio == 16.0 / 9.0)
652
        c->aspect = 0x07;
653

  
654
    if (fifo_init(&c->audio_data, AVCODEC_MAX_AUDIO_FRAME_SIZE) < 0)
655
        goto bail_out;
656

  
657
    dv_format_frame(c, &c->frame_buf[0]);
658

  
659
    return 0;
660
    
661
bail_out:
662
    return -1;
663
}
664

  
665
void dv_core_delete(DVMuxContext *c)
666
{    
667
    fifo_free(&c->audio_data);
668
}
libavformat/dvcore.h
1
/* 
2
 * DV format muxer/demuxer
3
 * Copyright (c) 2003 Roman Shaposhnik
4
 *
5
 * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
6
 * of DV technical info.
7
 *
8
 * This library is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
11
 * version 2 of the License, or (at your option) any later version.
12
 *
13
 * This library is distributed in the hope that it will be useful,
14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16
 * Lesser General Public License for more details.
17
 *
18
 * You should have received a copy of the GNU Lesser General Public
19
 * License along with this library; if not, write to the Free Software
20
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
21
 */
22
#include <time.h>
23
#include "avformat.h"
24

  
25
/* 
26
 * DVprofile is used to express the differences between various 
27
 * DV flavors. For now it's primarily used for differentiating
28
 * 525/60 and 625/50, but the plans are to use it for various
29
 * DV specs as well (e.g. SMPTE314M vs. IEC 61834).
30
 */
31
typedef struct DVprofile {
32
    int            dsf;                  /* value of the dsf in the DV header */
33
    int            frame_size;           /* total size of one frame in bytes */
34
    int            difseg_size;          /* number of DIF segments */
35
    int            frame_rate;      
36
    int            frame_rate_base;
37
    int            ltc_divisor;          /* FPS from the LTS standpoint */
38
    int            height;               /* picture height in pixels */
39
    uint16_t       *video_place;         /* positions of all DV macro blocks */
40
    
41
    int            audio_stride;         /* size of audio_shuffle table */
42
    int            audio_min_samples[3]; /* min ammount of audio samples */
43
                                         /* for 48Khz, 44.1Khz and 32Khz */
44
    int            audio_samples_dist[5];/* how many samples are supposed to be */
45
                                         /* in each frame in a 5 frames window */
46
    const uint16_t (*audio_shuffle)[9];  /* PCM shuffling table */
47
} DVprofile;
48

  
49
typedef struct DVMuxContext {
50
    const DVprofile*  sys;    /* Current DV profile. E.g.: 525/60, 625/50 */
51
    uint8_t     frame_buf[144000]; /* frame under contruction */
52
    FifoBuffer  audio_data;   /* Fifo for storing excessive amounts of PCM */
53
    int         frames;       /* Number of a current frame */
54
    time_t      start_time;   /* Start time of recording */
55
    uint8_t     aspect;       /* Aspect ID 0 - 4:3, 7 - 16:9 */
56
    int         ast, vst;     /* Audio and Video stream indecies */
57
    int         has_audio;    /* frame under contruction has audio */
58
    int         has_video;    /* frame under contruction has video */
59
} DVMuxContext;
60

  
61
void dv_format_frame(DVMuxContext *, uint8_t*);
62
void dv_inject_audio(DVMuxContext *, const uint8_t*, uint8_t*);
63
void dv_inject_video(DVMuxContext *, const uint8_t*, uint8_t*);
64

  
65
int  dv_extract_audio(uint8_t*, uint8_t*, AVCodecContext*);
66

  
67
int  dv_audio_frame_size(const DVprofile*, int);
68

  
69
void dv_assemble_frame(DVMuxContext *c, const uint8_t*, const uint8_t*, int);
70
int  dv_core_init(DVMuxContext *, AVStream*[]);
71
void dv_core_delete(DVMuxContext *);
72

  
73
const DVprofile* dv_frame_profile(uint8_t*);

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