aboutsummaryrefslogtreecommitdiffstats
path: root/libavdevice/decklink_dec.cpp
blob: c98c51f6bf7db060d1afc097359ea174bb108c6a (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
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
/*
 * Blackmagic DeckLink input
 * Copyright (c) 2013-2014 Luca Barbato, Deti Fliegl
 *
 * 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 <DeckLinkAPI.h>

#include <pthread.h>
#include <semaphore.h>

extern "C" {
#include "config.h"
#include "libavformat/avformat.h"
#include "libavformat/internal.h"
#include "libavutil/avutil.h"
#include "libavutil/common.h"
#include "libavutil/imgutils.h"
#include "libavutil/time.h"
#include "libavutil/mathematics.h"
#if CONFIG_LIBZVBI
#include <libzvbi.h>
#endif
}

#include "decklink_common.h"
#include "decklink_dec.h"

#if CONFIG_LIBZVBI
static uint8_t calc_parity_and_line_offset(int line)
{
    uint8_t ret = (line < 313) << 5;
    if (line >= 7 && line <= 22)
        ret += line;
    if (line >= 320 && line <= 335)
        ret += (line - 313);
    return ret;
}

int teletext_data_unit_from_vbi_data(int line, uint8_t *src, uint8_t *tgt)
{
    vbi_bit_slicer slicer;

    vbi_bit_slicer_init(&slicer, 720, 13500000, 6937500, 6937500, 0x00aaaae4, 0xffff, 18, 6, 42 * 8, VBI_MODULATION_NRZ_MSB, VBI_PIXFMT_UYVY);

    if (vbi_bit_slice(&slicer, src, tgt + 4) == FALSE)
        return -1;

    tgt[0] = 0x02; // data_unit_id
    tgt[1] = 0x2c; // data_unit_length
    tgt[2] = calc_parity_and_line_offset(line); // field_parity, line_offset
    tgt[3] = 0xe4; // framing code

    return 0;
}
#endif

static void avpacket_queue_init(AVFormatContext *avctx, AVPacketQueue *q)
{
    memset(q, 0, sizeof(AVPacketQueue));
    pthread_mutex_init(&q->mutex, NULL);
    pthread_cond_init(&q->cond, NULL);
    q->avctx = avctx;
}

static void avpacket_queue_flush(AVPacketQueue *q)
{
    AVPacketList *pkt, *pkt1;

    pthread_mutex_lock(&q->mutex);
    for (pkt = q->first_pkt; pkt != NULL; pkt = pkt1) {
        pkt1 = pkt->next;
        av_packet_unref(&pkt->pkt);
        av_freep(&pkt);
    }
    q->last_pkt   = NULL;
    q->first_pkt  = NULL;
    q->nb_packets = 0;
    q->size       = 0;
    pthread_mutex_unlock(&q->mutex);
}

static void avpacket_queue_end(AVPacketQueue *q)
{
    avpacket_queue_flush(q);
    pthread_mutex_destroy(&q->mutex);
    pthread_cond_destroy(&q->cond);
}

static unsigned long long avpacket_queue_size(AVPacketQueue *q)
{
    unsigned long long size;
    pthread_mutex_lock(&q->mutex);
    size = q->size;
    pthread_mutex_unlock(&q->mutex);
    return size;
}

static int avpacket_queue_put(AVPacketQueue *q, AVPacket *pkt)
{
    AVPacketList *pkt1;

    // Drop Packet if queue size is > 1GB
    if (avpacket_queue_size(q) >  1024 * 1024 * 1024 ) {
        av_log(q->avctx, AV_LOG_WARNING,  "Decklink input buffer overrun!\n");
        return -1;
    }
    /* duplicate the packet */
    if (av_dup_packet(pkt) < 0) {
        return -1;
    }

    pkt1 = (AVPacketList *)av_malloc(sizeof(AVPacketList));
    if (!pkt1) {
        return -1;
    }
    pkt1->pkt  = *pkt;
    pkt1->next = NULL;

    pthread_mutex_lock(&q->mutex);

    if (!q->last_pkt) {
        q->first_pkt = pkt1;
    } else {
        q->last_pkt->next = pkt1;
    }

    q->last_pkt = pkt1;
    q->nb_packets++;
    q->size += pkt1->pkt.size + sizeof(*pkt1);

    pthread_cond_signal(&q->cond);

    pthread_mutex_unlock(&q->mutex);
    return 0;
}

static int avpacket_queue_get(AVPacketQueue *q, AVPacket *pkt, int block)
{
    AVPacketList *pkt1;
    int ret;

    pthread_mutex_lock(&q->mutex);

    for (;; ) {
        pkt1 = q->first_pkt;
        if (pkt1) {
            q->first_pkt = pkt1->next;
            if (!q->first_pkt) {
                q->last_pkt = NULL;
            }
            q->nb_packets--;
            q->size -= pkt1->pkt.size + sizeof(*pkt1);
            *pkt     = pkt1->pkt;
            av_free(pkt1);
            ret = 1;
            break;
        } else if (!block) {
            ret = 0;
            break;
        } else {
            pthread_cond_wait(&q->cond, &q->mutex);
        }
    }
    pthread_mutex_unlock(&q->mutex);
    return ret;
}

class decklink_input_callback : public IDeckLinkInputCallback
{
public:
        decklink_input_callback(AVFormatContext *_avctx);
        ~decklink_input_callback();

        virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, LPVOID *ppv) { return E_NOINTERFACE; }
        virtual ULONG STDMETHODCALLTYPE AddRef(void);
        virtual ULONG STDMETHODCALLTYPE  Release(void);
        virtual HRESULT STDMETHODCALLTYPE VideoInputFormatChanged(BMDVideoInputFormatChangedEvents, IDeckLinkDisplayMode*, BMDDetectedVideoInputFormatFlags);
        virtual HRESULT STDMETHODCALLTYPE VideoInputFrameArrived(IDeckLinkVideoInputFrame*, IDeckLinkAudioInputPacket*);

private:
        ULONG           m_refCount;
        pthread_mutex_t m_mutex;
        AVFormatContext *avctx;
        decklink_ctx    *ctx;
        int no_video;
        int64_t initial_video_pts;
        int64_t initial_audio_pts;
};

decklink_input_callback::decklink_input_callback(AVFormatContext *_avctx) : m_refCount(0)
{
    avctx = _avctx;
    decklink_cctx       *cctx = (struct decklink_cctx *)avctx->priv_data;
    ctx = (struct decklink_ctx *)cctx->ctx;
    initial_audio_pts = initial_video_pts = AV_NOPTS_VALUE;
    pthread_mutex_init(&m_mutex, NULL);
}

decklink_input_callback::~decklink_input_callback()
{
    pthread_mutex_destroy(&m_mutex);
}

ULONG decklink_input_callback::AddRef(void)
{
    pthread_mutex_lock(&m_mutex);
    m_refCount++;
    pthread_mutex_unlock(&m_mutex);

    return (ULONG)m_refCount;
}

ULONG decklink_input_callback::Release(void)
{
    pthread_mutex_lock(&m_mutex);
    m_refCount--;
    pthread_mutex_unlock(&m_mutex);

    if (m_refCount == 0) {
        delete this;
        return 0;
    }

    return (ULONG)m_refCount;
}

static int64_t get_pkt_pts(IDeckLinkVideoInputFrame *videoFrame,
                           IDeckLinkAudioInputPacket *audioFrame,
                           int64_t wallclock,
                           DecklinkPtsSource pts_src,
                           AVRational time_base, int64_t *initial_pts)
{
    int64_t pts = AV_NOPTS_VALUE;
    BMDTimeValue bmd_pts;
    BMDTimeValue bmd_duration;
    HRESULT res = E_INVALIDARG;
    switch (pts_src) {
        case PTS_SRC_AUDIO:
            if (audioFrame)
                res = audioFrame->GetPacketTime(&bmd_pts, time_base.den);
            break;
        case PTS_SRC_VIDEO:
            if (videoFrame)
                res = videoFrame->GetStreamTime(&bmd_pts, &bmd_duration, time_base.den);
            break;
        case PTS_SRC_REFERENCE:
            if (videoFrame)
                res = videoFrame->GetHardwareReferenceTimestamp(time_base.den, &bmd_pts, &bmd_duration);
            break;
        case PTS_SRC_WALLCLOCK:
            pts = av_rescale_q(wallclock, AV_TIME_BASE_Q, time_base);
            break;
    }
    if (res == S_OK)
        pts = bmd_pts / time_base.num;

    if (pts != AV_NOPTS_VALUE && *initial_pts == AV_NOPTS_VALUE)
        *initial_pts = pts;
    if (*initial_pts != AV_NOPTS_VALUE)
        pts -= *initial_pts;

    return pts;
}

HRESULT decklink_input_callback::VideoInputFrameArrived(
    IDeckLinkVideoInputFrame *videoFrame, IDeckLinkAudioInputPacket *audioFrame)
{
    void *frameBytes;
    void *audioFrameBytes;
    BMDTimeValue frameTime;
    BMDTimeValue frameDuration;
    int64_t wallclock = 0;

    ctx->frameCount++;
    if (ctx->audio_pts_source == PTS_SRC_WALLCLOCK || ctx->video_pts_source == PTS_SRC_WALLCLOCK)
        wallclock = av_gettime_relative();

    // Handle Video Frame
    if (videoFrame) {
        AVPacket pkt;
        av_init_packet(&pkt);
        if (ctx->frameCount % 25 == 0) {
            unsigned long long qsize = avpacket_queue_size(&ctx->queue);
            av_log(avctx, AV_LOG_DEBUG,
                    "Frame received (#%lu) - Valid (%liB) - QSize %fMB\n",
                    ctx->frameCount,
                    videoFrame->GetRowBytes() * videoFrame->GetHeight(),
                    (double)qsize / 1024 / 1024);
        }

        videoFrame->GetBytes(&frameBytes);
        videoFrame->GetStreamTime(&frameTime, &frameDuration,
                                  ctx->video_st->time_base.den);

        if (videoFrame->GetFlags() & bmdFrameHasNoInputSource) {
            if (ctx->draw_bars && videoFrame->GetPixelFormat() == bmdFormat8BitYUV) {
                unsigned bars[8] = {
                    0xEA80EA80, 0xD292D210, 0xA910A9A5, 0x90229035,
                    0x6ADD6ACA, 0x51EF515A, 0x286D28EF, 0x10801080 };
                int width  = videoFrame->GetWidth();
                int height = videoFrame->GetHeight();
                unsigned *p = (unsigned *)frameBytes;

                for (int y = 0; y < height; y++) {
                    for (int x = 0; x < width; x += 2)
                        *p++ = bars[(x * 8) / width];
                }
            }

            if (!no_video) {
                av_log(avctx, AV_LOG_WARNING, "Frame received (#%lu) - No input signal detected "
                        "- Frames dropped %u\n", ctx->frameCount, ++ctx->dropped);
            }
            no_video = 1;
        } else {
            if (no_video) {
                av_log(avctx, AV_LOG_WARNING, "Frame received (#%lu) - Input returned "
                        "- Frames dropped %u\n", ctx->frameCount, ++ctx->dropped);
            }
            no_video = 0;
        }

        pkt.pts = get_pkt_pts(videoFrame, audioFrame, wallclock, ctx->video_pts_source, ctx->video_st->time_base, &initial_video_pts);
        pkt.dts = pkt.pts;

        pkt.duration = frameDuration;
        //To be made sure it still applies
        pkt.flags       |= AV_PKT_FLAG_KEY;
        pkt.stream_index = ctx->video_st->index;
        pkt.data         = (uint8_t *)frameBytes;
        pkt.size         = videoFrame->GetRowBytes() *
                           videoFrame->GetHeight();
        //fprintf(stderr,"Video Frame size %d ts %d\n", pkt.size, pkt.pts);

#if CONFIG_LIBZVBI
        if (!no_video && ctx->teletext_lines && videoFrame->GetPixelFormat() == bmdFormat8BitYUV && videoFrame->GetWidth() == 720) {
            IDeckLinkVideoFrameAncillary *vanc;
            AVPacket txt_pkt;
            uint8_t txt_buf0[1611]; // max 35 * 46 bytes decoded teletext lines + 1 byte data_identifier
            uint8_t *txt_buf = txt_buf0;

            if (videoFrame->GetAncillaryData(&vanc) == S_OK) {
                int i;
                int64_t line_mask = 1;
                txt_buf[0] = 0x10;    // data_identifier - EBU_data
                txt_buf++;
                for (i = 6; i < 336; i++, line_mask <<= 1) {
                    uint8_t *buf;
                    if ((ctx->teletext_lines & line_mask) && vanc->GetBufferForVerticalBlankingLine(i, (void**)&buf) == S_OK) {
                        if (teletext_data_unit_from_vbi_data(i, buf, txt_buf) >= 0)
                            txt_buf += 46;
                    }
                    if (i == 22)
                        i = 317;
                }
                vanc->Release();
                if (txt_buf - txt_buf0 > 1) {
                    int stuffing_units = (4 - ((45 + txt_buf - txt_buf0) / 46) % 4) % 4;
                    while (stuffing_units--) {
                        memset(txt_buf, 0xff, 46);
                        txt_buf[1] = 0x2c; // data_unit_length
                        txt_buf += 46;
                    }
                    av_init_packet(&txt_pkt);
                    txt_pkt.pts = pkt.pts;
                    txt_pkt.dts = pkt.dts;
                    txt_pkt.stream_index = ctx->teletext_st->index;
                    txt_pkt.data = txt_buf0;
                    txt_pkt.size = txt_buf - txt_buf0;
                    if (avpacket_queue_put(&ctx->queue, &txt_pkt) < 0) {
                        ++ctx->dropped;
                    }
                }
            }
        }
#endif

        if (avpacket_queue_put(&ctx->queue, &pkt) < 0) {
            ++ctx->dropped;
        }
    }

    // Handle Audio Frame
    if (audioFrame) {
        AVPacket pkt;
        BMDTimeValue audio_pts;
        av_init_packet(&pkt);

        //hack among hacks
        pkt.size = audioFrame->GetSampleFrameCount() * ctx->audio_st->codecpar->channels * (16 / 8);
        audioFrame->GetBytes(&audioFrameBytes);
        audioFrame->GetPacketTime(&audio_pts, ctx->audio_st->time_base.den);
        pkt.pts = get_pkt_pts(videoFrame, audioFrame, wallclock, ctx->audio_pts_source, ctx->audio_st->time_base, &initial_audio_pts);
        pkt.dts = pkt.pts;

        //fprintf(stderr,"Audio Frame size %d ts %d\n", pkt.size, pkt.pts);
        pkt.flags       |= AV_PKT_FLAG_KEY;
        pkt.stream_index = ctx->audio_st->index;
        pkt.data         = (uint8_t *)audioFrameBytes;

        if (avpacket_queue_put(&ctx->queue, &pkt) < 0) {
            ++ctx->dropped;
        }
    }

    return S_OK;
}

HRESULT decklink_input_callback::VideoInputFormatChanged(
    BMDVideoInputFormatChangedEvents events, IDeckLinkDisplayMode *mode,
    BMDDetectedVideoInputFormatFlags)
{
    return S_OK;
}

static HRESULT decklink_start_input(AVFormatContext *avctx)
{
    struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
    struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;

    ctx->input_callback = new decklink_input_callback(avctx);
    ctx->dli->SetCallback(ctx->input_callback);
    return ctx->dli->StartStreams();
}

extern "C" {

av_cold int ff_decklink_read_close(AVFormatContext *avctx)
{
    struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
    struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;

    if (ctx->capture_started) {
        ctx->dli->StopStreams();
        ctx->dli->DisableVideoInput();
        ctx->dli->DisableAudioInput();
    }

    ff_decklink_cleanup(avctx);
    avpacket_queue_end(&ctx->queue);

    av_freep(&cctx->ctx);

    return 0;
}

av_cold int ff_decklink_read_header(AVFormatContext *avctx)
{
    struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
    struct decklink_ctx *ctx;
    AVStream *st;
    HRESULT result;
    char fname[1024];
    char *tmp;
    int mode_num = 0;
    int ret;

    ctx = (struct decklink_ctx *) av_mallocz(sizeof(struct decklink_ctx));
    if (!ctx)
        return AVERROR(ENOMEM);
    ctx->list_devices = cctx->list_devices;
    ctx->list_formats = cctx->list_formats;
    ctx->teletext_lines = cctx->teletext_lines;
    ctx->preroll      = cctx->preroll;
    ctx->duplex_mode  = cctx->duplex_mode;
    if (cctx->video_input > 0 && (unsigned int)cctx->video_input < FF_ARRAY_ELEMS(decklink_video_connection_map))
        ctx->video_input = decklink_video_connection_map[cctx->video_input];
    if (cctx->audio_input > 0 && (unsigned int)cctx->audio_input < FF_ARRAY_ELEMS(decklink_audio_connection_map))
        ctx->audio_input = decklink_audio_connection_map[cctx->audio_input];
    ctx->audio_pts_source = cctx->audio_pts_source;
    ctx->video_pts_source = cctx->video_pts_source;
    ctx->draw_bars = cctx->draw_bars;
    cctx->ctx = ctx;

#if !CONFIG_LIBZVBI
    if (ctx->teletext_lines) {
        av_log(avctx, AV_LOG_ERROR, "Libzvbi support is needed for capturing teletext, please recompile FFmpeg.\n");
        return AVERROR(ENOSYS);
    }
#endif

    /* Check audio channel option for valid values: 2, 8 or 16 */
    switch (cctx->audio_channels) {
        case 2:
        case 8:
        case 16:
            break;
        default:
            av_log(avctx, AV_LOG_ERROR, "Value of channels option must be one of 2, 8 or 16\n");
            return AVERROR(EINVAL);
    }

    /* List available devices. */
    if (ctx->list_devices) {
        ff_decklink_list_devices(avctx);
        return AVERROR_EXIT;
    }

    strcpy (fname, avctx->filename);
    tmp=strchr (fname, '@');
    if (tmp != NULL) {
        mode_num = atoi (tmp+1);
        *tmp = 0;
    }

    ret = ff_decklink_init_device(avctx, fname);
    if (ret < 0)
        return ret;

    /* Get input device. */
    if (ctx->dl->QueryInterface(IID_IDeckLinkInput, (void **) &ctx->dli) != S_OK) {
        av_log(avctx, AV_LOG_ERROR, "Could not open input device from '%s'\n",
               avctx->filename);
        ret = AVERROR(EIO);
        goto error;
    }

    /* List supported formats. */
    if (ctx->list_formats) {
        ff_decklink_list_formats(avctx, DIRECTION_IN);
        ret = AVERROR_EXIT;
        goto error;
    }

    if (mode_num > 0) {
        if (ff_decklink_set_format(avctx, DIRECTION_IN, mode_num) < 0) {
            av_log(avctx, AV_LOG_ERROR, "Could not set mode %d for %s\n", mode_num, fname);
            ret = AVERROR(EIO);
            goto error;
        }
    }

    /* Setup streams. */
    st = avformat_new_stream(avctx, NULL);
    if (!st) {
        av_log(avctx, AV_LOG_ERROR, "Cannot add stream\n");
        ret = AVERROR(ENOMEM);
        goto error;
    }
    st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;
    st->codecpar->codec_id    = AV_CODEC_ID_PCM_S16LE;
    st->codecpar->sample_rate = bmdAudioSampleRate48kHz;
    st->codecpar->channels    = cctx->audio_channels;
    avpriv_set_pts_info(st, 64, 1, 1000000);  /* 64 bits pts in us */
    ctx->audio_st=st;

    st = avformat_new_stream(avctx, NULL);
    if (!st) {
        av_log(avctx, AV_LOG_ERROR, "Cannot add stream\n");
        ret = AVERROR(ENOMEM);
        goto error;
    }
    st->codecpar->codec_type  = AVMEDIA_TYPE_VIDEO;
    st->codecpar->width       = ctx->bmd_width;
    st->codecpar->height      = ctx->bmd_height;

    st->time_base.den      = ctx->bmd_tb_den;
    st->time_base.num      = ctx->bmd_tb_num;
    av_stream_set_r_frame_rate(st, av_make_q(st->time_base.den, st->time_base.num));

    if (cctx->v210) {
        st->codecpar->codec_id    = AV_CODEC_ID_V210;
        st->codecpar->codec_tag   = MKTAG('V', '2', '1', '0');
        st->codecpar->bit_rate    = av_rescale(ctx->bmd_width * ctx->bmd_height * 64, st->time_base.den, st->time_base.num * 3);
    } else {
        st->codecpar->codec_id    = AV_CODEC_ID_RAWVIDEO;
        st->codecpar->format      = AV_PIX_FMT_UYVY422;
        st->codecpar->codec_tag   = MKTAG('U', 'Y', 'V', 'Y');
        st->codecpar->bit_rate    = av_rescale(ctx->bmd_width * ctx->bmd_height * 16, st->time_base.den, st->time_base.num);
    }

    avpriv_set_pts_info(st, 64, 1, 1000000);  /* 64 bits pts in us */

    ctx->video_st=st;

    if (ctx->teletext_lines) {
        st = avformat_new_stream(avctx, NULL);
        if (!st) {
            av_log(avctx, AV_LOG_ERROR, "Cannot add stream\n");
            ret = AVERROR(ENOMEM);
            goto error;
        }
        st->codecpar->codec_type  = AVMEDIA_TYPE_SUBTITLE;
        st->time_base.den         = ctx->bmd_tb_den;
        st->time_base.num         = ctx->bmd_tb_num;
        st->codecpar->codec_id    = AV_CODEC_ID_DVB_TELETEXT;
        avpriv_set_pts_info(st, 64, 1, 1000000);  /* 64 bits pts in us */
        ctx->teletext_st = st;
    }

    av_log(avctx, AV_LOG_VERBOSE, "Using %d input audio channels\n", ctx->audio_st->codecpar->channels);
    result = ctx->dli->EnableAudioInput(bmdAudioSampleRate48kHz, bmdAudioSampleType16bitInteger, ctx->audio_st->codecpar->channels);

    if (result != S_OK) {
        av_log(avctx, AV_LOG_ERROR, "Cannot enable audio input\n");
        ret = AVERROR(EIO);
        goto error;
    }

    result = ctx->dli->EnableVideoInput(ctx->bmd_mode,
                                        cctx->v210 ? bmdFormat10BitYUV : bmdFormat8BitYUV,
                                        bmdVideoInputFlagDefault);

    if (result != S_OK) {
        av_log(avctx, AV_LOG_ERROR, "Cannot enable video input\n");
        ret = AVERROR(EIO);
        goto error;
    }

    avpacket_queue_init (avctx, &ctx->queue);

    if (decklink_start_input (avctx) != S_OK) {
        av_log(avctx, AV_LOG_ERROR, "Cannot start input stream\n");
        ret = AVERROR(EIO);
        goto error;
    }

    return 0;

error:
    ff_decklink_cleanup(avctx);
    return ret;
}

int ff_decklink_read_packet(AVFormatContext *avctx, AVPacket *pkt)
{
    struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
    struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;
    AVFrame *frame = ctx->video_st->codec->coded_frame;

    avpacket_queue_get(&ctx->queue, pkt, 1);
    if (frame && (ctx->bmd_field_dominance == bmdUpperFieldFirst || ctx->bmd_field_dominance == bmdLowerFieldFirst)) {
        frame->interlaced_frame = 1;
        if (ctx->bmd_field_dominance == bmdUpperFieldFirst) {
            frame->top_field_first = 1;
        }
    }

    return 0;
}

} /* extern "C" */