Statistics
| Branch: | Revision:

ffmpeg / libavformat / dv.c @ 5a757507

History | View | Annotate | Download (31.7 KB)

1
/* 
2
 * General DV muxer/demuxer 
3
 * Copyright (c) 2003 Roman Shaposhnick
4
 *
5
 * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
6
 * of DV technical info.
7
 *
8
 * Raw DV format
9
 * Copyright (c) 2002 Fabrice Bellard.
10
 *
11
 * This library is free software; you can redistribute it and/or
12
 * modify it under the terms of the GNU Lesser General Public
13
 * License as published by the Free Software Foundation; either
14
 * version 2 of the License, or (at your option) any later version.
15
 *
16
 * This library is distributed in the hope that it will be useful,
17
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
19
 * Lesser General Public License for more details.
20
 *
21
 * You should have received a copy of the GNU Lesser General Public
22
 * License along with this library; if not, write to the Free Software
23
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
24
 */
25
#include <time.h>
26
#include "avformat.h"
27
#include "dvdata.h"
28
#include "dv.h"
29

    
30
struct DVDemuxContext {
31
    AVFormatContext* fctx;
32
    AVStream*        vst;
33
    AVStream*        ast[2];       
34
    AVPacket         audio_pkt[2];
35
    int              ach;
36
    int              frames;
37
    uint64_t         abytes;
38
};
39

    
40
struct DVMuxContext {
41
    const DVprofile*  sys;    /* Current DV profile. E.g.: 525/60, 625/50 */
42
    uint8_t     frame_buf[144000]; /* frame under contruction */
43
    FifoBuffer  audio_data;   /* Fifo for storing excessive amounts of PCM */
44
    int         frames;       /* Number of a current frame */
45
    time_t      start_time;   /* Start time of recording */
46
    uint8_t     aspect;       /* Aspect ID 0 - 4:3, 7 - 16:9 */
47
    int         has_audio;    /* frame under contruction has audio */
48
    int         has_video;    /* frame under contruction has video */
49
};
50

    
51
enum dv_section_type {
52
     dv_sect_header  = 0x1f,
53
     dv_sect_subcode = 0x3f,
54
     dv_sect_vaux    = 0x56,
55
     dv_sect_audio   = 0x76,
56
     dv_sect_video   = 0x96,
57
};
58

    
59
enum dv_pack_type {
60
     dv_header525     = 0x3f, /* see dv_write_pack for important details on */ 
61
     dv_header625     = 0xbf, /* these two packs */
62
     dv_timecode      = 0x13,
63
     dv_audio_source  = 0x50,
64
     dv_audio_control = 0x51,
65
     dv_audio_recdate = 0x52,
66
     dv_audio_rectime = 0x53,
67
     dv_video_source  = 0x60,
68
     dv_video_control = 0x61,
69
     dv_viedo_recdate = 0x62,
70
     dv_video_rectime = 0x63,
71
     dv_unknown_pack  = 0xff,
72
};
73

    
74

    
75

    
76
/*
77
 * The reason why the following three big ugly looking tables are
78
 * here is my lack of DV spec IEC 61834. The tables were basically 
79
 * constructed to make code that places packs in SSYB, VAUX and 
80
 * AAUX blocks very simple and table-driven. They conform to the
81
 * SMPTE 314M and the output of my personal DV camcorder, neither
82
 * of which is sufficient for a reliable DV stream producing. Thus
83
 * while code is still in development I'll be gathering input from
84
 * people with different DV equipment and modifying the tables to
85
 * accommodate all the quirks. Later on, if possible, some of them
86
 * will be folded into smaller tables and/or switch-if logic. For 
87
 * now, my only excuse is -- they don't eat up that much of a space.
88
 */
89

    
90
static const int dv_ssyb_packs_dist[12][6] = {
91
    { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
92
    { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
93
    { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
94
    { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
95
    { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
96
    { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
97
    { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
98
    { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
99
    { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
100
    { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
101
    { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
102
    { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
103
};
104

    
105
static const int dv_vaux_packs_dist[12][15] = {
106
    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
107
      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
108
    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
109
      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
110
    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
111
      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
112
    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
113
      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
114
    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
115
      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
116
    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
117
      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
118
    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
119
      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
120
    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
121
      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
122
    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
123
      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
124
    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
125
      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
126
    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
127
      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
128
    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
129
      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
130
};
131

    
132
static const int dv_aaux_packs_dist[12][9] = {
133
    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
134
    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
135
    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
136
    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
137
    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
138
    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
139
    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
140
    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
141
    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
142
    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
143
    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
144
    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
145
};
146

    
147
static inline uint16_t dv_audio_12to16(uint16_t sample)
148
{
149
    uint16_t shift, result;
150
    
151
    sample = (sample < 0x800) ? sample : sample | 0xf000;
152
    shift = (sample & 0xf00) >> 8;
153

    
154
    if (shift < 0x2 || shift > 0xd) {
155
        result = sample;
156
    } else if (shift < 0x8) {
157
        shift--;
158
        result = (sample - (256 * shift)) << shift;
159
    } else {
160
        shift = 0xe - shift;
161
        result = ((sample + ((256 * shift) + 1)) << shift) - 1;
162
    }
163

    
164
    return result;
165
}
166

    
167
static int dv_audio_frame_size(const DVprofile* sys, int frame)
168
{
169
    return sys->audio_samples_dist[frame % (sizeof(sys->audio_samples_dist)/
170
                                            sizeof(sys->audio_samples_dist[0]))];
171
}
172

    
173
static int dv_write_pack(enum dv_pack_type pack_id, DVMuxContext *c, uint8_t* buf)
174
{
175
    struct tm tc;
176
    time_t ct;
177
    int ltc_frame;
178

    
179
    buf[0] = (uint8_t)pack_id;
180
    switch (pack_id) {
181
    case dv_header525: /* I can't imagine why these two weren't defined as real */
182
    case dv_header625: /* packs in SMPTE314M -- they definitely look like ones */
183
          buf[1] = 0xf8 |               /* reserved -- always 1 */
184
                   (0 & 0x07);          /* APT: Track application ID */
185
          buf[2] = (0 << 7)    | /* TF1: audio data is 0 - valid; 1 - invalid */
186
                   (0x0f << 3) | /* reserved -- always 1 */
187
                   (0 & 0x07);   /* AP1: Audio application ID */
188
          buf[3] = (0 << 7)    | /* TF2: video data is 0 - valid; 1 - invalid */  
189
                   (0x0f << 3) | /* reserved -- always 1 */
190
                   (0 & 0x07);   /* AP2: Video application ID */
191
          buf[4] = (0 << 7)    | /* TF3: subcode(SSYB) is 0 - valid; 1 - invalid */ 
192
                   (0x0f << 3) | /* reserved -- always 1 */
193
                   (0 & 0x07);   /* AP3: Subcode application ID */
194
          break;
195
    case dv_timecode:
196
          ct = (time_t)(c->frames / ((float)c->sys->frame_rate / 
197
                                     (float)c->sys->frame_rate_base));
198
          localtime_r(&ct, &tc);
199
          /* 
200
           * LTC drop-frame frame counter drops two frames (0 and 1) every 
201
           * minute, unless it is exactly divisible by 10
202
           */
203
          ltc_frame = (c->frames + 2*ct/60 - 2*ct/600) % c->sys->ltc_divisor;
204
          buf[1] = (0 << 7) | /* Color fame: 0 - unsync; 1 - sync mode */
205
                   (1 << 6) | /* Drop frame timecode: 0 - nondrop; 1 - drop */
206
                   ((ltc_frame / 10) << 4) | /* Tens of frames */
207
                   (ltc_frame % 10);         /* Units of frames */
208
          buf[2] = (1 << 7) | /* Biphase mark polarity correction: 0 - even; 1 - odd */
209
                   ((tc.tm_sec / 10) << 4) | /* Tens of seconds */
210
                   (tc.tm_sec % 10);         /* Units of seconds */
211
          buf[3] = (1 << 7) | /* Binary group flag BGF0 */
212
                   ((tc.tm_min / 10) << 4) | /* Tens of minutes */
213
                   (tc.tm_min % 10);         /* Units of minutes */
214
          buf[4] = (1 << 7) | /* Binary group flag BGF2 */
215
                   (1 << 6) | /* Binary group flag BGF1 */
216
                   ((tc.tm_hour / 10) << 4) | /* Tens of hours */
217
                   (tc.tm_hour % 10);         /* Units of hours */
218
          break;
219
    case dv_audio_source:  /* AAUX source pack */
220
          buf[1] = (0 << 7) | /* locked mode       */
221
                   (1 << 6) | /* reserved -- always 1 */
222
                   (dv_audio_frame_size(c->sys, c->frames) -
223
                    c->sys->audio_min_samples[0]);
224
                              /* # of samples      */
225
          buf[2] = (0 << 7) | /* multi-stereo      */
226
                   (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */
227
                   (0 << 4) | /* pair bit: 0 -- one pair of channels */
228
                    0;        /* audio mode        */
229
          buf[3] = (1 << 7) | /* res               */
230
                   (1 << 6) | /* multi-language flag */
231
                   (c->sys->dsf << 5) | /*  system: 60fields/50fields */
232
                    0;        /* definition: 0 -- SD (525/625) */
233
          buf[4] = (1 << 7) | /* emphasis: 1 -- off */
234
                   (0 << 6) | /* emphasis time constant: 0 -- reserved */
235
                   (0 << 3) | /* frequency: 0 -- 48Khz, 1 -- 44,1Khz, 2 -- 32Khz */
236
                    0;        /* quantization: 0 -- 16bit linear, 1 -- 12bit nonlinear */                            
237
          break;
238
    case dv_audio_control:
239
          buf[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */
240
                   (1 << 4) | /* input source: 1 -- digital input */
241
                   (3 << 2) | /* compression: 3 -- no information */
242
                    0;        /* misc. info/SMPTE emphasis off */
243
          buf[2] = (1 << 7) | /* recording start point: 1 -- no */
244
                   (1 << 6) | /* recording end point: 1 -- no */
245
                   (1 << 3) | /* recording mode: 1 -- original */
246
                    7;         
247
          buf[3] = (1 << 7) | /* direction: 1 -- forward */
248
                    0x20;     /* speed */
249
          buf[4] = (1 << 7) | /* reserved -- always 1 */
250
                    0x7f;     /* genre category */
251
          break;
252
    case dv_audio_recdate:
253
    case dv_viedo_recdate:  /* VAUX recording date */
254
          ct = c->start_time + (time_t)(c->frames / 
255
               ((float)c->sys->frame_rate / (float)c->sys->frame_rate_base));
256
          localtime_r(&ct, &tc);
257
          buf[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */
258
                         /* 0xff is very likely to be "unknown" */
259
          buf[2] = (3 << 6) | /* reserved -- always 1 */
260
                   ((tc.tm_mday / 10) << 4) | /* Tens of day */
261
                   (tc.tm_mday % 10);         /* Units of day */
262
          buf[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */
263
                   (tc.tm_mon % 10);         /* Units of month */
264
          buf[4] = (((tc.tm_year % 100) / 10) << 4) | /* Tens of year */
265
                   (tc.tm_year % 10);                 /* Units of year */
266
          break;
267
    case dv_audio_rectime:  /* AAUX recording time */
268
    case dv_video_rectime:  /* VAUX recording time */
269
          ct = c->start_time + (time_t)(c->frames / 
270
               ((float)c->sys->frame_rate / (float)c->sys->frame_rate_base));
271
          localtime_r(&ct, &tc);
272
          buf[1] = (3 << 6) | /* reserved -- always 1 */
273
                   0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */
274
          buf[2] = (1 << 7) | /* reserved -- always 1 */ 
275
                   ((tc.tm_sec / 10) << 4) | /* Tens of seconds */
276
                   (tc.tm_sec % 10);         /* Units of seconds */
277
          buf[3] = (1 << 7) | /* reserved -- always 1 */
278
                   ((tc.tm_min / 10) << 4) | /* Tens of minutes */
279
                   (tc.tm_min % 10);         /* Units of minutes */
280
          buf[4] = (3 << 6) | /* reserved -- always 1 */ 
281
                   ((tc.tm_hour / 10) << 4) | /* Tens of hours */
282
                   (tc.tm_hour % 10);         /* Units of hours */
283
          break;
284
    case dv_video_source:
285
          buf[1] = 0xff; /* reserved -- always 1 */
286
          buf[2] = (1 << 7) | /* B/W: 0 - b/w, 1 - color */
287
                   (1 << 6) | /* following CLF is valid - 0, invalid - 1 */
288
                   (3 << 4) | /* CLF: color frames id (see ITU-R BT.470-4) */
289
                   0xf; /* reserved -- always 1 */
290
          buf[3] = (3 << 6) | /* reserved -- always 1 */
291
                   (c->sys->dsf << 5) | /*  system: 60fields/50fields */
292
                   0; /* signal type video compression */
293
          buf[4] = 0xff; /* VISC: 0xff -- no information */
294
          break;
295
    case dv_video_control:
296
          buf[1] = (0 << 6) | /* Copy generation management (CGMS) 0 -- free */
297
                   0x3f; /* reserved -- always 1 */
298
          buf[2] = 0xc8 | /* reserved -- always b11001xxx */
299
                   c->aspect;
300
          buf[3] = (1 << 7) | /* Frame/field flag 1 -- frame, 0 -- field */
301
                   (1 << 6) | /* First/second field flag 0 -- field 2, 1 -- field 1 */
302
                   (1 << 5) | /* Frame change flag 0 -- same picture as before, 1 -- different */
303
                   (1 << 4) | /* 1 - interlaced, 0 - noninterlaced */
304
                   0xc; /* reserved -- always b1100 */
305
          buf[4] = 0xff; /* reserved -- always 1 */
306
          break;
307
    default:
308
          buf[1] = buf[2] = buf[3] = buf[4] = 0xff;
309
    }
310
    return 5;
311
}
312

    
313
static inline int dv_write_dif_id(enum dv_section_type t, uint8_t seq_num, 
314
                                  uint8_t dif_num, uint8_t* buf)
315
{
316
    buf[0] = (uint8_t)t;    /* Section type */
317
    buf[1] = (seq_num<<4) | /* DIF seq number 0-9 for 525/60; 0-11 for 625/50 */
318
             (0 << 3) |     /* FSC: for 50Mb/s 0 - first channel; 1 - second */
319
             7;             /* reserved -- always 1 */
320
    buf[2] = dif_num;       /* DIF block number Video: 0-134, Audio: 0-8 */
321
    return 3;
322
}
323

    
324
static inline int dv_write_ssyb_id(uint8_t syb_num, uint8_t fr, uint8_t* buf)
325
{
326
    if (syb_num == 0 || syb_num == 6) {
327
        buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
328
                 (0<<4)  | /* AP3 (Subcode application ID) */
329
                 0x0f;     /* reserved -- always 1 */
330
    } 
331
    else if (syb_num == 11) {
332
        buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
333
                 0x7f;     /* reserved -- always 1 */
334
    }
335
    else {
336
        buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
337
                 (0<<4)  | /* APT (Track application ID) */
338
                 0x0f;     /* reserved -- always 1 */
339
    }
340
    buf[1] = 0xf0 |            /* reserved -- always 1 */
341
             (syb_num & 0x0f); /* SSYB number 0 - 11   */
342
    buf[2] = 0xff;             /* reserved -- always 1 */
343
    return 3;
344
}
345

    
346
static void dv_format_frame(DVMuxContext *c, uint8_t* buf)
347
{
348
    int i, j, k;
349
    
350
    for (i = 0; i < c->sys->difseg_size; i++) {
351
       memset(buf, 0xff, 80 * 6); /* First 6 DIF blocks are for control data */
352
       
353
       /* DV header: 1DIF */
354
       buf += dv_write_dif_id(dv_sect_header, i, 0, buf);
355
       buf += dv_write_pack((c->sys->dsf ? dv_header625 : dv_header525), c, buf);
356
       buf += 72; /* unused bytes */
357
                                   
358
       /* DV subcode: 2DIFs */
359
       for (j = 0; j < 2; j++) {
360
          buf += dv_write_dif_id( dv_sect_subcode, i, j, buf);
361
          for (k = 0; k < 6; k++) {
362
             buf += dv_write_ssyb_id(k, (i < c->sys->difseg_size/2), buf);
363
             buf += dv_write_pack(dv_ssyb_packs_dist[i][k], c, buf);
364
          }
365
          buf += 29; /* unused bytes */
366
       }
367
       
368
       /* DV VAUX: 3DIFs */
369
       for (j = 0; j < 3; j++) {
370
          buf += dv_write_dif_id(dv_sect_vaux, i, j, buf);
371
          for (k = 0; k < 15 ; k++)
372
             buf += dv_write_pack(dv_vaux_packs_dist[i][k], c, buf);
373
          buf += 2; /* unused bytes */
374
       } 
375
       
376
       /* DV Audio/Video: 135 Video DIFs + 9 Audio DIFs */
377
       for (j = 0; j < 135; j++) {
378
            if (j%15 == 0) {
379
                buf += dv_write_dif_id(dv_sect_audio, i, j/15, buf);
380
                buf += dv_write_pack(dv_aaux_packs_dist[i][j/15], c, buf);
381
                buf += 72; /* shuffled PCM audio */
382
            }
383
            buf += dv_write_dif_id(dv_sect_video, i, j, buf);
384
            buf += 77; /* 1 video macro block: 1 bytes control
385
                                               4 * 14 bytes Y 8x8 data
386
                                                   10 bytes Cr 8x8 data
387
                                                   10 bytes Cb 8x8 data */
388
       }
389
    }
390
}
391

    
392
static void dv_inject_audio(DVMuxContext *c, const uint8_t* pcm, uint8_t* frame_ptr)
393
{
394
    int i, j, d, of;
395
    for (i = 0; i < c->sys->difseg_size; i++) {
396
       frame_ptr += 6 * 80; /* skip DIF segment header */
397
       for (j = 0; j < 9; j++) {
398
          for (d = 8; d < 80; d+=2) {
399
             of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride;
400
             frame_ptr[d] = pcm[of*2+1]; // FIXME: may be we have to admit
401
             frame_ptr[d+1] = pcm[of*2]; //        that DV is a big endian PCM       
402
          }
403
          frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
404
       }
405
    }
406
}
407

    
408
static void dv_inject_video(DVMuxContext *c, const uint8_t* video_data, uint8_t* frame_ptr)
409
{
410
    int i, j;
411
    int ptr = 0;
412

    
413
    for (i = 0; i < c->sys->difseg_size; i++) {
414
       ptr += 6 * 80; /* skip DIF segment header */
415
       for (j = 0; j < 135; j++) {
416
            if (j%15 == 0)
417
                ptr += 80; /* skip Audio DIF */
418
            ptr += 3;
419
            memcpy(frame_ptr + ptr, video_data + ptr, 77);
420
            ptr += 77;
421
       }
422
    }
423
}
424

    
425
/* 
426
 * This is the dumbest implementation of all -- it simply looks at
427
 * a fixed offset and if pack isn't there -- fails. We might want
428
 * to have a fallback mechanism for complete search of missing packs.
429
 */
430
static const uint8_t* dv_extract_pack(uint8_t* frame, enum dv_pack_type t)
431
{
432
    int offs;
433
    
434
    switch (t) {
435
    case dv_audio_source:
436
          offs = (80*6 + 80*16*3 + 3);
437
          break;
438
    case dv_audio_control:
439
          offs = (80*6 + 80*16*4 + 3);
440
          break;
441
    case dv_video_control:
442
          offs = (80*5 + 48 + 5);
443
          break;
444
    default:
445
          return NULL;
446
    }   
447

    
448
    return (frame[offs] == t ? &frame[offs] : NULL);
449
}
450

    
451
/* 
452
 * There's a couple of assumptions being made here:
453
 * 1. By default we silence erroneous (0x8000/16bit 0x800/12bit) audio samples.
454
 *    We can pass them upwards when ffmpeg will be ready to deal with them.
455
 * 2. We don't do software emphasis.
456
 * 3. Audio is always returned as 16bit linear samples: 12bit nonlinear samples
457
 *    are converted into 16bit linear ones.
458
 */
459
static int dv_extract_audio(uint8_t* frame, uint8_t* pcm, uint8_t* pcm2)
460
{
461
    int size, i, j, d, of, smpls, freq, quant, half_ch;
462
    uint16_t lc, rc;
463
    const DVprofile* sys;
464
    const uint8_t* as_pack;
465
    
466
    as_pack = dv_extract_pack(frame, dv_audio_source);
467
    if (!as_pack)    /* No audio ? */
468
        return 0;
469
   
470
    sys = dv_frame_profile(frame);
471
    smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */
472
    freq = (as_pack[4] >> 3) & 0x07; /* 0 - 48KHz, 1 - 44,1kHz, 2 - 32 kHz */
473
    quant = as_pack[4] & 0x07; /* 0 - 16bit linear, 1 - 12bit nonlinear */
474
    
475
    if (quant > 1)
476
        return -1; /* Unsupported quantization */
477

    
478
    size = (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */
479
    half_ch = sys->difseg_size/2;
480

    
481
    /* for each DIF segment */
482
    for (i = 0; i < sys->difseg_size; i++) {
483
       frame += 6 * 80; /* skip DIF segment header */
484
       if (quant == 1 && i == half_ch) {
485
           if (!pcm2)
486
               break;
487
           else
488
               pcm = pcm2;
489
       }
490

    
491
       for (j = 0; j < 9; j++) {
492
          for (d = 8; d < 80; d += 2) {
493
             if (quant == 0) {  /* 16bit quantization */
494
                 of = sys->audio_shuffle[i][j] + (d - 8)/2 * sys->audio_stride;
495
                 if (of*2 >= size)
496
                     continue;
497
                 
498
                 pcm[of*2] = frame[d+1]; // FIXME: may be we have to admit
499
                 pcm[of*2+1] = frame[d]; //        that DV is a big endian PCM
500
                 if (pcm[of*2+1] == 0x80 && pcm[of*2] == 0x00)
501
                     pcm[of*2+1] = 0;
502
              } else {           /* 12bit quantization */
503
                 lc = ((uint16_t)frame[d] << 4) | 
504
                      ((uint16_t)frame[d+2] >> 4);
505
                 rc = ((uint16_t)frame[d+1] << 4) |
506
                      ((uint16_t)frame[d+2] & 0x0f);
507
                 lc = (lc == 0x800 ? 0 : dv_audio_12to16(lc));
508
                 rc = (rc == 0x800 ? 0 : dv_audio_12to16(rc));
509

    
510
                 of = sys->audio_shuffle[i%half_ch][j] + (d - 8)/3 * sys->audio_stride;
511
                 if (of*2 >= size)
512
                     continue;
513

    
514
                 pcm[of*2] = lc & 0xff; // FIXME: may be we have to admit
515
                 pcm[of*2+1] = lc >> 8; //        that DV is a big endian PCM
516
                 of = sys->audio_shuffle[i%half_ch+half_ch][j] + 
517
                      (d - 8)/3 * sys->audio_stride;
518
                 pcm[of*2] = rc & 0xff; // FIXME: may be we have to admit
519
                 pcm[of*2+1] = rc >> 8; //        that DV is a big endian PCM
520
                 ++d;
521
              }
522
          }
523
                
524
          frame += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
525
        }
526
    }
527

    
528
    return size;
529
}
530

    
531
static int dv_extract_audio_info(DVDemuxContext* c, uint8_t* frame)
532
{
533
    const uint8_t* as_pack;
534
    const DVprofile* sys;
535
    int freq, smpls, quant, i;
536

    
537
    sys = dv_frame_profile(frame);
538
    as_pack = dv_extract_pack(frame, dv_audio_source);
539
    if (!as_pack || !sys) {    /* No audio ? */
540
        c->ach = 0;
541
        return -1;
542
    }
543
    
544
    smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */
545
    freq = (as_pack[4] >> 3) & 0x07; /* 0 - 48KHz, 1 - 44,1kHz, 2 - 32 kHz */
546
    quant = as_pack[4] & 0x07; /* 0 - 16bit linear, 1 - 12bit nonlinear */
547
    c->ach = (quant && freq == 2) ? 2 : 1;
548

    
549
    /* The second stereo channel could appear in IEC 61834 stream only */
550
    if (c->ach == 2 && !c->ast[1]) {
551
        c->ast[1] = av_new_stream(c->fctx, 0);
552
        if (c->ast[1]) {
553
            c->ast[1]->codec.codec_type = CODEC_TYPE_AUDIO;
554
            c->ast[1]->codec.codec_id = CODEC_ID_PCM_S16LE;
555
        } else
556
            c->ach = 1;
557
    }
558
    for (i=0; i<c->ach; i++) {
559
       c->ast[i]->codec.sample_rate = dv_audio_frequency[freq];
560
       c->ast[i]->codec.channels = 2;
561
       c->ast[i]->codec.bit_rate = 2 * dv_audio_frequency[freq] * 16;
562
    }
563
    
564
    return (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */;
565
}
566

    
567
static int dv_extract_video_info(DVDemuxContext *c, uint8_t* frame)
568
{
569
    const DVprofile* sys; 
570
    const uint8_t* vsc_pack;
571
    AVCodecContext* avctx;
572
    int apt, is16_9;
573
    int size = 0;
574
    
575
    sys = dv_frame_profile(frame);
576
    if (sys) {
577
        avctx = &c->vst->codec;
578
        
579
        avctx->frame_rate = sys->frame_rate;
580
        avctx->frame_rate_base = sys->frame_rate_base;
581
        avctx->width = sys->width;
582
        avctx->height = sys->height;
583
        avctx->pix_fmt = sys->pix_fmt;
584
        
585
        vsc_pack = dv_extract_pack(frame, dv_video_control);
586
        apt = frame[4] & 0x07;
587
        is16_9 = (vsc_pack && (vsc_pack[2] & 0x07) == (apt?0x02:0x07));
588
        avctx->sample_aspect_ratio = sys->sar[is16_9];
589
        
590
        size = sys->frame_size;
591
    }
592
    return size;
593
}
594

    
595
/* 
596
 * The following 6 functions constitute our interface to the world
597
 */
598

    
599
int dv_assemble_frame(DVMuxContext *c, AVStream* st,
600
                      const uint8_t* data, int data_size, uint8_t** frame)
601
{
602
    uint8_t pcm[8192];
603
    int fsize, reqasize;
604
   
605
    *frame = &c->frame_buf[0];
606
    if (c->has_audio && c->has_video) {  /* must be a stale frame */
607
        dv_format_frame(c, *frame);
608
        c->frames++;
609
        c->has_audio = c->has_video = 0;
610
    }
611
    
612
    if (st->codec.codec_type == CODEC_TYPE_VIDEO) {
613
        /* FIXME: we have to have more sensible approach than this one */
614
        if (c->has_video)
615
            av_log(&st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames);
616
            
617
        dv_inject_video(c, data, *frame);
618
        c->has_video = 1;
619
        data_size = 0;
620
    } 
621
    
622
    reqasize = 4 * dv_audio_frame_size(c->sys, c->frames);
623
    fsize = fifo_size(&c->audio_data, c->audio_data.rptr);
624
    if (st->codec.codec_type == CODEC_TYPE_AUDIO || (c->has_video && fsize >= reqasize)) { 
625
        if (fsize + data_size >= reqasize && !c->has_audio) {
626
            if (fsize >= reqasize) {
627
                fifo_read(&c->audio_data, &pcm[0], reqasize, &c->audio_data.rptr);
628
            } else {
629
                fifo_read(&c->audio_data, &pcm[0], fsize, &c->audio_data.rptr);
630
                memcpy(&pcm[fsize], &data[0], reqasize - fsize);
631
                data += reqasize - fsize;
632
                data_size -= reqasize - fsize;
633
            }
634
            dv_inject_audio(c, &pcm[0], *frame);
635
            c->has_audio = 1;
636
        }
637
    
638
        /* FIXME: we have to have more sensible approach than this one */
639
        if (fifo_size(&c->audio_data, c->audio_data.rptr) + data_size >= 100*AVCODEC_MAX_AUDIO_FRAME_SIZE)
640
            av_log(&st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames);
641
        fifo_write(&c->audio_data, (uint8_t *)data, data_size, &c->audio_data.wptr);
642
    }
643

    
644
    return (c->has_audio && c->has_video) ? c->sys->frame_size : 0;
645
}
646

    
647
DVMuxContext* dv_init_mux(AVFormatContext* s)
648
{
649
    DVMuxContext *c;
650
    AVStream *vst;
651
    AVStream *ast;
652

    
653
    c = av_mallocz(sizeof(DVMuxContext));
654
    if (!c)
655
        return NULL;
656

    
657
    if (s->nb_streams != 2)
658
        goto bail_out;
659

    
660
    /* We have to sort out where audio and where video stream is */
661
    if (s->streams[0]->codec.codec_type == CODEC_TYPE_VIDEO &&
662
        s->streams[1]->codec.codec_type == CODEC_TYPE_AUDIO) {
663
       vst = s->streams[0];
664
       ast = s->streams[1];
665
    }
666
    else if (s->streams[1]->codec.codec_type == CODEC_TYPE_VIDEO &&
667
             s->streams[0]->codec.codec_type == CODEC_TYPE_AUDIO) {
668
           vst = s->streams[1];
669
           ast = s->streams[0];
670
    } else
671
        goto bail_out;
672
  
673
    /* Some checks -- DV format is very picky about its incoming streams */
674
    if (vst->codec.codec_id != CODEC_ID_DVVIDEO ||
675
        ast->codec.codec_id != CODEC_ID_PCM_S16LE)
676
       goto bail_out;
677
    if (ast->codec.sample_rate != 48000 ||
678
        ast->codec.channels != 2)
679
       goto bail_out;
680

    
681
    c->sys = dv_codec_profile(&vst->codec);
682
    if (!c->sys)
683
        goto bail_out;
684
    
685
    /* Ok, everything seems to be in working order */
686
    c->frames = 0;
687
    c->has_audio = c->has_video = 0;
688
    c->start_time = time(NULL);
689
    c->aspect = 0; /* 4:3 is the default */
690
    if ((int)(av_q2d(vst->codec.sample_aspect_ratio) * vst->codec.width / vst->codec.height * 10) == 17) /* 16:9 */ 
691
        c->aspect = 0x07;
692

    
693
    if (fifo_init(&c->audio_data, 100*AVCODEC_MAX_AUDIO_FRAME_SIZE) < 0)
694
        goto bail_out;
695

    
696
    dv_format_frame(c, &c->frame_buf[0]);
697

    
698
    return c;
699
    
700
bail_out:
701
    av_free(c);
702
    return NULL;
703
}
704

    
705
void dv_delete_mux(DVMuxContext *c)
706
{    
707
    fifo_free(&c->audio_data);
708
}
709

    
710
DVDemuxContext* dv_init_demux(AVFormatContext *s)
711
{
712
    DVDemuxContext *c;
713

    
714
    c = av_mallocz(sizeof(DVDemuxContext));
715
    if (!c)
716
        return NULL;
717

    
718
    c->vst = av_new_stream(s, 0);
719
    c->ast[0] = av_new_stream(s, 0);
720
    if (!c->vst || !c->ast[0])
721
        goto fail;
722
    c->fctx = s;
723
    c->ast[1] = NULL;
724
    c->ach = 0;
725
    c->frames = 0;
726
    c->abytes = 0;
727
    c->audio_pkt[0].size = 0;
728
    c->audio_pkt[1].size = 0;
729
    
730
    c->vst->codec.codec_type = CODEC_TYPE_VIDEO;
731
    c->vst->codec.codec_id = CODEC_ID_DVVIDEO;
732
    c->vst->codec.bit_rate = 25000000;
733
    
734
    c->ast[0]->codec.codec_type = CODEC_TYPE_AUDIO;
735
    c->ast[0]->codec.codec_id = CODEC_ID_PCM_S16LE;
736
   
737
    s->ctx_flags |= AVFMTCTX_NOHEADER; 
738
    
739
    av_set_pts_info(s, 64, 1, 30000);
740
    
741
    return c;
742
    
743
fail:
744
    if (c->vst)
745
        av_free(c->vst);
746
    if (c->ast[0])
747
        av_free(c->ast[0]);
748
    av_free(c);
749
    return NULL;
750
}
751

    
752
static void __destruct_pkt(struct AVPacket *pkt)
753
{
754
    pkt->data = NULL; pkt->size = 0;
755
    return;
756
}
757

    
758
int dv_get_packet(DVDemuxContext *c, AVPacket *pkt)
759
{
760
    int size = -1;
761
    int i;
762

    
763
    for (i=0; i<c->ach; i++) {
764
       if (c->ast[i] && c->audio_pkt[i].size) {
765
           *pkt = c->audio_pkt[i];
766
           c->audio_pkt[i].size = 0;
767
           size = pkt->size;
768
           break;
769
       }
770
    }
771

    
772
    return size;
773
}
774

    
775
int dv_produce_packet(DVDemuxContext *c, AVPacket *pkt, 
776
                      uint8_t* buf, int buf_size)
777
{
778
    int size, i;
779
    const DVprofile* sys = dv_frame_profile(buf);
780
   
781
    if (buf_size < 4 || buf_size < sys->frame_size)
782
        return -1;   /* Broken frame, or not enough data */
783

    
784
    /* Queueing audio packet */
785
    /* FIXME: in case of no audio/bad audio we have to do something */
786
    size = dv_extract_audio_info(c, buf);
787
    c->audio_pkt[0].data = c->audio_pkt[1].data = NULL;
788
    for (i=0; i<c->ach; i++) {
789
       if (av_new_packet(&c->audio_pkt[i], size) < 0)
790
           return AVERROR_NOMEM;
791
       c->audio_pkt[i].stream_index = c->ast[i]->index;
792
       c->audio_pkt[i].pts = c->abytes * 30000*8 / c->ast[i]->codec.bit_rate;
793
       c->audio_pkt[i].flags |= PKT_FLAG_KEY;
794
    }
795
    dv_extract_audio(buf, c->audio_pkt[0].data, c->audio_pkt[1].data);
796
    c->abytes += size;
797
    
798
    /* Now it's time to return video packet */
799
    size = dv_extract_video_info(c, buf);
800
    av_init_packet(pkt);
801
    pkt->destruct = __destruct_pkt;
802
    pkt->data     = buf;
803
    pkt->size     = size; 
804
    pkt->flags   |= PKT_FLAG_KEY;
805
    pkt->stream_index = c->vst->id;
806
    pkt->pts      = c->frames * sys->frame_rate_base * (30000/sys->frame_rate);
807
    
808
    c->frames++;
809

    
810
    return size;
811
}
812
                           
813
int64_t dv_frame_offset(DVDemuxContext *c, int64_t timestamp)
814
{
815
    const DVprofile* sys = dv_codec_profile(&c->vst->codec);
816

    
817
    return sys->frame_size * ((timestamp * sys->frame_rate) / 
818
                              (AV_TIME_BASE * sys->frame_rate_base));
819
}
820

    
821
/************************************************************
822
 * Implementation of the easiest DV storage of all -- raw DV.
823
 ************************************************************/
824
 
825
typedef struct RawDVContext {
826
    uint8_t         buf[144000];
827
    DVDemuxContext* dv_demux;
828
} RawDVContext;
829

    
830
static int dv_read_header(AVFormatContext *s,
831
                          AVFormatParameters *ap)
832
{
833
    RawDVContext *c = s->priv_data;
834
    c->dv_demux = dv_init_demux(s);
835
   
836
    return c->dv_demux ? 0 : -1;
837
}
838

    
839

    
840
static int dv_read_packet(AVFormatContext *s, AVPacket *pkt)
841
{
842
    int size;
843
    RawDVContext *c = s->priv_data; 
844
  
845
    size = dv_get_packet(c->dv_demux, pkt);
846
    
847
    if (size < 0) {
848
        if (get_buffer(&s->pb, c->buf, 4) <= 0) 
849
            return -EIO;
850
    
851
        size = dv_frame_profile(c->buf)->frame_size;
852
        if (get_buffer(&s->pb, c->buf + 4, size - 4) <= 0)
853
            return -EIO;
854

    
855
        size = dv_produce_packet(c->dv_demux, pkt, c->buf, size);
856
    } 
857
    
858
    return size;
859
}
860

    
861
static int dv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp)
862
{
863
    RawDVContext *c = s->priv_data;
864

    
865
    return url_fseek(&s->pb, dv_frame_offset(c->dv_demux, timestamp), SEEK_SET);
866
}
867

    
868
static int dv_read_close(AVFormatContext *s)
869
{
870
    RawDVContext *c = s->priv_data;
871
    av_free(c->dv_demux);
872
    return 0;
873
}
874

    
875
static int dv_write_header(AVFormatContext *s)
876
{
877
    s->priv_data = dv_init_mux(s);
878
    if (!s->priv_data) {
879
        av_log(s, AV_LOG_ERROR, "Can't initialize DV format!\n"
880
                    "Make sure that you supply exactly two streams:\n"
881
                    "     video: 25fps or 29.97fps, audio: 2ch/48Khz/PCM\n");
882
        return -1;
883
    }
884
    return 0;
885
}
886

    
887
static int dv_write_packet(struct AVFormatContext *s, 
888
                           int stream_index,
889
                           const uint8_t *buf, int size, int64_t pts)
890
{
891
    uint8_t* frame;
892
    int fsize;
893
   
894
    fsize = dv_assemble_frame((DVMuxContext *)s->priv_data, s->streams[stream_index],
895
                              buf, size, &frame);
896
    if (fsize > 0) {
897
        put_buffer(&s->pb, frame, fsize); 
898
        put_flush_packet(&s->pb);
899
    } 
900
    return 0;
901
}
902

    
903
/* 
904
 * We might end up with some extra A/V data without matching counterpart.
905
 * E.g. video data without enough audio to write the complete frame.
906
 * Currently we simply drop the last frame. I don't know whether this 
907
 * is the best strategy of all
908
 */
909
static int dv_write_trailer(struct AVFormatContext *s)
910
{
911
    dv_delete_mux((DVMuxContext *)s->priv_data);
912
    return 0;
913
}
914

    
915
static AVInputFormat dv_iformat = {
916
    "dv",
917
    "DV video format",
918
    sizeof(RawDVContext),
919
    NULL,
920
    dv_read_header,
921
    dv_read_packet,
922
    dv_read_close,
923
    dv_read_seek,
924
    .extensions = "dv,dif",
925
};
926

    
927
static AVOutputFormat dv_oformat = {
928
    "dv",
929
    "DV video format",
930
    NULL,
931
    "dv",
932
    sizeof(DVMuxContext),
933
    CODEC_ID_PCM_S16LE,
934
    CODEC_ID_DVVIDEO,
935
    dv_write_header,
936
    dv_write_packet,
937
    dv_write_trailer,
938
};
939

    
940
int ff_dv_init(void)
941
{
942
    av_register_input_format(&dv_iformat);
943
    av_register_output_format(&dv_oformat);
944
    return 0;
945
}