aboutsummaryrefslogtreecommitdiffstats
path: root/libavformat/dvenc.c
blob: 9a853ba7ceeb5ec8981bcfa3adad667a8fe1ac5e (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
/*
 * General DV muxer/demuxer
 * Copyright (c) 2003 Roman Shaposhnik
 *
 * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
 * of DV technical info.
 *
 * Raw DV format
 * Copyright (c) 2002 Fabrice Bellard
 *
 * 50 Mbps (DVCPRO50) support
 * Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
#include <time.h>

#include "libavutil/time_internal.h"
#include "avformat.h"
#include "internal.h"
#include "libavcodec/dv_profile.h"
#include "libavcodec/dv.h"
#include "dv.h"
#include "libavutil/avassert.h"
#include "libavutil/fifo.h"
#include "libavutil/mathematics.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/opt.h"
#include "libavutil/timecode.h"

#define MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32-bit audio

struct DVMuxContext {
    AVClass          *av_class;
    const AVDVProfile*  sys;           /* current DV profile, e.g.: 525/60, 625/50 */
    int               n_ast;         /* number of stereo audio streams (up to 2) */
    AVStream         *ast[4];        /* stereo audio streams */
    AVFifoBuffer     *audio_data[4]; /* FIFO for storing excessive amounts of PCM */
    int               frames;        /* current frame number */
    int64_t           start_time;    /* recording start time */
    int               has_audio;     /* frame under construction has audio */
    int               has_video;     /* frame under construction has video */
    uint8_t           frame_buf[DV_MAX_FRAME_SIZE]; /* frame under construction */
    AVTimecode        tc;            /* timecode context */
};

static const int dv_aaux_packs_dist[12][9] = {
    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
};

static void brktimegm(time_t secs, struct tm *tm)
{
    tm = gmtime_r(&secs, tm);

    tm->tm_year += 1900; /* unlike gmtime_r we store complete year here */
    tm->tm_mon  += 1;    /* unlike gmtime_r tm_mon is from 1 to 12 */
}

static int dv_audio_frame_size(const AVDVProfile* sys, int frame, int sample_rate)
{
    if ((sys->time_base.den == 25 || sys->time_base.den == 50) && sys->time_base.num == 1) {
        if      (sample_rate == 32000) return 1280;
        else if (sample_rate == 44100) return 1764;
        else                           return 1920;
    }

    av_assert0(sample_rate == 48000);

    return sys->audio_samples_dist[frame % (sizeof(sys->audio_samples_dist) /
                                            sizeof(sys->audio_samples_dist[0]))];
}

static int dv_write_pack(enum dv_pack_type pack_id, DVMuxContext *c, uint8_t* buf, int channel, int seq)
{
    struct tm tc;
    time_t ct;
    uint32_t timecode;
    int audio_type = 0;

    buf[0] = (uint8_t)pack_id;
    switch (pack_id) {
    case dv_timecode:
        timecode  = av_timecode_get_smpte_from_framenum(&c->tc, c->frames);
        timecode |= 1<<23 | 1<<15 | 1<<7 | 1<<6; // biphase and binary group flags
        AV_WB32(buf + 1, timecode);
        break;
    case dv_audio_source:  /* AAUX source pack */
        if (c->ast[channel]->codecpar->sample_rate == 44100) {
            audio_type = 1;
        } else if (c->ast[channel]->codecpar->sample_rate == 32000)
            audio_type = 2;
        buf[1] = (1 << 7) | /* locked mode -- SMPTE only supports locked mode */
                 (1 << 6) | /* reserved -- always 1 */
                 (dv_audio_frame_size(c->sys, c->frames, c->ast[channel]->codecpar->sample_rate) -
                  c->sys->audio_min_samples[audio_type]);
                            /* # of samples      */
        buf[2] = (0 << 7) | /* multi-stereo      */
                 (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */
                 (0 << 4) | /* pair bit: 0 -- one pair of channels */
                 (seq >= c->sys->difseg_size/2); /* audio mode (1st or 2nd channel) */
        buf[3] = (1 << 7) | /* res               */
                 (1 << 6) | /* multi-language flag */
                 (c->sys->dsf << 5) | /*  system: 60fields/50fields */
                 (DV_PROFILE_IS_HD(c->sys) ? 0x3 : c->sys->video_stype ? 2 : 0); /* stype */
        buf[4] = (1 << 7) | /* emphasis: 1 -- off */
                 (0 << 6) | /* emphasis time constant: 0 -- reserved */
                 (audio_type << 3) | /* frequency: 0 -- 48kHz, 1 -- 44,1kHz, 2 -- 32kHz */
                  0;        /* quantization: 0 -- 16-bit linear, 1 -- 12-bit nonlinear */

        break;
    case dv_audio_control:
        buf[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */
                 (1 << 4) | /* input source: 1 -- digital input */
                 (3 << 2) | /* compression: 3 -- no information */
                  0;        /* misc. info/SMPTE emphasis off */
        buf[2] = (1 << 7) | /* recording start point: 1 -- no */
                 (1 << 6) | /* recording end point: 1 -- no */
                 (1 << 3) | /* recording mode: 1 -- original */
                  7;
        buf[3] = (1 << 7) | /* direction: 1 -- forward */
                 (c->sys->pix_fmt == AV_PIX_FMT_YUV420P ? 0x20 : /* speed */
                                                       c->sys->ltc_divisor * 4);
        buf[4] = (1 << 7) | /* reserved -- always 1 */
                  0x7f;     /* genre category */
        break;
    case dv_audio_recdate:
    case dv_video_recdate:  /* VAUX recording date */
        ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num,
                                            c->sys->time_base.den, AV_ROUND_DOWN);
        brktimegm(ct, &tc);
        buf[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */
                       /* 0xff is very likely to be "unknown" */
        buf[2] = (3 << 6) | /* reserved -- always 1 */
                 ((tc.tm_mday / 10) << 4) | /* Tens of day */
                 (tc.tm_mday % 10);         /* Units of day */
        buf[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */
                 ((tc.tm_mon / 10) << 4) |    /* Tens of month */
                 (tc.tm_mon  % 10);           /* Units of month */
        buf[4] = (((tc.tm_year % 100) / 10) << 4) | /* Tens of year */
                 (tc.tm_year % 10);                 /* Units of year */
        break;
    case dv_audio_rectime:  /* AAUX recording time */
    case dv_video_rectime:  /* VAUX recording time */
        ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num,
                                                       c->sys->time_base.den, AV_ROUND_DOWN);
        brktimegm(ct, &tc);
        buf[1] = (3 << 6) | /* reserved -- always 1 */
                 0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */
        buf[2] = (1 << 7) | /* reserved -- always 1 */
                 ((tc.tm_sec / 10) << 4) | /* Tens of seconds */
                 (tc.tm_sec % 10);         /* Units of seconds */
        buf[3] = (1 << 7) | /* reserved -- always 1 */
                 ((tc.tm_min / 10) << 4) | /* Tens of minutes */
                 (tc.tm_min % 10);         /* Units of minutes */
        buf[4] = (3 << 6) | /* reserved -- always 1 */
                 ((tc.tm_hour / 10) << 4) | /* Tens of hours */
                 (tc.tm_hour % 10);         /* Units of hours */
        break;
    default:
        buf[1] = buf[2] = buf[3] = buf[4] = 0xff;
    }
    return 5;
}

static void dv_inject_audio(DVMuxContext *c, int channel, uint8_t* frame_ptr)
{
    int i, j, d, of, size;
    size = 4 * dv_audio_frame_size(c->sys, c->frames, c->ast[channel]->codecpar->sample_rate);
    frame_ptr += channel * c->sys->difseg_size * 150 * 80;
    for (i = 0; i < c->sys->difseg_size; i++) {
        frame_ptr += 6 * 80; /* skip DIF segment header */
        for (j = 0; j < 9; j++) {
            dv_write_pack(dv_aaux_packs_dist[i][j], c, &frame_ptr[3], channel, i);
            for (d = 8; d < 80; d+=2) {
                of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride;
                if (of*2 >= size)
                    continue;

                frame_ptr[d]   = *av_fifo_peek2(c->audio_data[channel], of*2+1); // FIXME: maybe we have to admit
                frame_ptr[d+1] = *av_fifo_peek2(c->audio_data[channel], of*2);   //        that DV is a big-endian PCM
            }
            frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
        }
    }
}

static void dv_inject_metadata(DVMuxContext *c, uint8_t* frame)
{
    int j, k;
    uint8_t* buf;
    int seq = 0;

    for (buf = frame; buf < frame + c->sys->frame_size; buf += 150 * 80, seq++) {
        /* DV subcode: 2nd and 3d DIFs */
        for (j = 80; j < 80 * 3; j += 80) {
            for (k = 6; k < 6 * 8; k += 8)
                dv_write_pack(dv_timecode, c, &buf[j+k], 0, seq);

            if (((long)(buf-frame)/(c->sys->frame_size/(c->sys->difseg_size*c->sys->n_difchan))%c->sys->difseg_size) > 5) { /* FIXME: is this really needed ? */
                dv_write_pack(dv_video_recdate, c, &buf[j+14], 0, seq);
                dv_write_pack(dv_video_rectime, c, &buf[j+22], 0, seq);
                dv_write_pack(dv_video_recdate, c, &buf[j+38], 0, seq);
                dv_write_pack(dv_video_rectime, c, &buf[j+46], 0, seq);
            }
        }

        /* DV VAUX: 4th, 5th and 6th 3DIFs */
        for (j = 80*3 + 3; j < 80*6; j += 80) {
            dv_write_pack(dv_video_recdate, c, &buf[j+5* 2], 0, seq);
            dv_write_pack(dv_video_rectime, c, &buf[j+5* 3], 0, seq);
            dv_write_pack(dv_video_recdate, c, &buf[j+5*11], 0, seq);
            dv_write_pack(dv_video_rectime, c, &buf[j+5*12], 0, seq);
        }
    }
}

/*
 * The following 3 functions constitute our interface to the world
 */

static int dv_assemble_frame(AVFormatContext *s,
                             DVMuxContext *c, AVStream* st,
                             uint8_t* data, int data_size, uint8_t** frame)
{
    int i, reqasize;

    *frame = &c->frame_buf[0];

    switch (st->codecpar->codec_type) {
    case AVMEDIA_TYPE_VIDEO:
        /* FIXME: we have to have more sensible approach than this one */
        if (c->has_video)
            av_log(s, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames);
        if (data_size != c->sys->frame_size) {
            av_log(s, AV_LOG_ERROR, "Unexpected frame size, %d != %d\n",
                   data_size, c->sys->frame_size);
            return AVERROR(ENOSYS);
        }

        memcpy(*frame, data, c->sys->frame_size);
        c->has_video = 1;
        break;
    case AVMEDIA_TYPE_AUDIO:
        for (i = 0; i < c->n_ast && st != c->ast[i]; i++);

          /* FIXME: we have to have more sensible approach than this one */
        if (av_fifo_size(c->audio_data[i]) + data_size >= 100*MAX_AUDIO_FRAME_SIZE)
            av_log(s, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames);
        av_fifo_generic_write(c->audio_data[i], data, data_size, NULL);

        reqasize = 4 * dv_audio_frame_size(c->sys, c->frames, st->codecpar->sample_rate);

        /* Let us see if we've got enough audio for one DV frame. */
        c->has_audio |= ((reqasize <= av_fifo_size(c->audio_data[i])) << i);

        break;
    default:
        break;
    }

    /* Let us see if we have enough data to construct one DV frame. */
    if (c->has_video == 1 && c->has_audio + 1 == 1 << c->n_ast) {
        dv_inject_metadata(c, *frame);
        c->has_audio = 0;
        for (i=0; i < c->n_ast; i++) {
            dv_inject_audio(c, i, *frame);
            reqasize = 4 * dv_audio_frame_size(c->sys, c->frames, c->ast[i]->codecpar->sample_rate);
            av_fifo_drain(c->audio_data[i], reqasize);
            c->has_audio |= ((reqasize <= av_fifo_size(c->audio_data[i])) << i);
        }

        c->has_video = 0;

        c->frames++;

        return c->sys->frame_size;
    }

    return 0;
}

static DVMuxContext* dv_init_mux(AVFormatContext* s)
{
    DVMuxContext *c = s->priv_data;
    AVStream *vst = NULL;
    int i;

    /* we support at most 1 video and 2 audio streams */
    if (s->nb_streams > 5)
        return NULL;

    /* We have to sort out where audio and where video stream is */
    for (i=0; i<s->nb_streams; i++) {
        AVStream *st = s->streams[i];
        switch (st->codecpar->codec_type) {
        case AVMEDIA_TYPE_VIDEO:
            if (vst) return NULL;
            if (st->codecpar->codec_id != AV_CODEC_ID_DVVIDEO)
                goto bail_out;
            vst = st;
            break;
        case AVMEDIA_TYPE_AUDIO:
            if (c->n_ast > 1) return NULL;
            /* Some checks -- DV format is very picky about its incoming streams */
            if(st->codecpar->codec_id    != AV_CODEC_ID_PCM_S16LE ||
               st->codecpar->channels    != 2)
                goto bail_out;
            if (st->codecpar->sample_rate != 48000 &&
                st->codecpar->sample_rate != 44100 &&
                st->codecpar->sample_rate != 32000    )
                goto bail_out;
            c->ast[c->n_ast++] = st;
            break;
        default:
            goto bail_out;
        }
    }

    if (!vst)
        goto bail_out;

    c->sys = av_dv_codec_profile2(vst->codecpar->width, vst->codecpar->height,
                                  vst->codecpar->format, vst->time_base);
    if (!c->sys)
        goto bail_out;

    if ((c->sys->time_base.den != 25 && c->sys->time_base.den != 50) || c->sys->time_base.num != 1) {
        if (c->ast[0] && c->ast[0]->codecpar->sample_rate != 48000)
            goto bail_out;
        if (c->ast[1] && c->ast[1]->codecpar->sample_rate != 48000)
            goto bail_out;
    }

    if (((c->n_ast > 1) && (c->sys->n_difchan < 2)) ||
        ((c->n_ast > 2) && (c->sys->n_difchan < 4))) {
        /* only 2 stereo pairs allowed in 50Mbps mode */
        goto bail_out;
    }

    /* Ok, everything seems to be in working order */
    c->frames     = 0;
    c->has_audio  = 0;
    c->has_video  = 0;
    ff_parse_creation_time_metadata(s, &c->start_time, 1);

    for (i=0; i < c->n_ast; i++) {
        if (c->ast[i] && !(c->audio_data[i]=av_fifo_alloc_array(100, MAX_AUDIO_FRAME_SIZE))) {
            goto bail_out;
        }
    }

    return c;

bail_out:
    return NULL;
}

static int dv_write_header(AVFormatContext *s)
{
    AVRational rate;
    DVMuxContext *dvc = s->priv_data;
    AVDictionaryEntry *tcr = av_dict_get(s->metadata, "timecode", NULL, 0);

    if (!dv_init_mux(s)) {
        av_log(s, AV_LOG_ERROR, "Can't initialize DV format!\n"
                    "Make sure that you supply exactly two streams:\n"
                    "     video: 25fps or 29.97fps, audio: 2ch/48|44|32kHz/PCM\n"
                    "     (50Mbps allows an optional second audio stream)\n");
        return -1;
    }
    rate.num = dvc->sys->ltc_divisor;
    rate.den = 1;
    if (!tcr) { // no global timecode, look into the streams
        int i;
        for (i = 0; i < s->nb_streams; i++) {
            tcr = av_dict_get(s->streams[i]->metadata, "timecode", NULL, 0);
            if (tcr)
                break;
        }
    }
    if (tcr && av_timecode_init_from_string(&dvc->tc, rate, tcr->value, s) >= 0)
        return 0;
    return av_timecode_init(&dvc->tc, rate, 0, 0, s);
}

static int dv_write_packet(struct AVFormatContext *s, AVPacket *pkt)
{
    uint8_t* frame;
    int fsize;

    fsize = dv_assemble_frame(s, s->priv_data, s->streams[pkt->stream_index],
                              pkt->data, pkt->size, &frame);
    if (fsize < 0) {
        return fsize;
    }
    avio_write(s->pb, frame, fsize);
    return 0;
}

/*
 * We might end up with some extra A/V data without matching counterpart.
 * E.g. video data without enough audio to write the complete frame.
 * Currently we simply drop the last frame. I don't know whether this
 * is the best strategy of all
 */
static void dv_deinit(AVFormatContext *s)
{
    DVMuxContext *c = s->priv_data;

    for (int i = 0; i < c->n_ast; i++)
        av_fifo_freep(&c->audio_data[i]);
}

const AVOutputFormat ff_dv_muxer = {
    .name              = "dv",
    .long_name         = NULL_IF_CONFIG_SMALL("DV (Digital Video)"),
    .extensions        = "dv",
    .priv_data_size    = sizeof(DVMuxContext),
    .audio_codec       = AV_CODEC_ID_PCM_S16LE,
    .video_codec       = AV_CODEC_ID_DVVIDEO,
    .write_header      = dv_write_header,
    .write_packet      = dv_write_packet,
    .deinit            = dv_deinit,
};