modules/access/decklink.cpp

   1 /*****************************************************************************
   2  * decklink.cpp: BlackMagic DeckLink SDI input module
   3  *****************************************************************************
   4  * Copyright (C) 2010 Steinar H. Gunderson
   5  * Copyright (C) 2012-2014 Rafaël Carré
   6  *
   7  * Authors: Steinar H. Gunderson <steinar+vlc@gunderson.no>
   8             Rafaël Carré <funman@videolanorg>
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU Lesser General Public License as published by
  12  * the Free Software Foundation; either version 2.1 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This library is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  18  * Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with this program; if not, write to the Free Software Foundation,
  22  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 #ifdef HAVE_CONFIG_H
  26 # include "config.h"
  27 #endif
  28
  29 #include <vlc_common.h>
  30 #include <vlc_plugin.h>
  31 #include <vlc_demux.h>
  32
  33 #include <arpa/inet.h>
  34
  35 #include <DeckLinkAPI.h>
  36 #include <DeckLinkAPIDispatch.cpp>
  37
  38 #include "sdi.h"
  39
  40 #include <atomic>
  41
  42 static int  Open (vlc_object_t *);
  43 static void Close(vlc_object_t *);
  44
  45 #define CARD_INDEX_TEXT N_("Input card to use")
  46 #define CARD_INDEX_LONGTEXT N_( \
  47     "DeckLink capture card to use, if multiple exist. " \
  48     "The cards are numbered from 0.")
  49
  50 #define MODE_TEXT N_("Desired input video mode. Leave empty for autodetection.")
  51 #define MODE_LONGTEXT N_( \
  52     "Desired input video mode for DeckLink captures. " \
  53     "This value should be a FOURCC code in textual " \
  54     "form, e.g. \"ntsc\".")
  55
  56 #define AUDIO_CONNECTION_TEXT N_("Audio connection")
  57 #define AUDIO_CONNECTION_LONGTEXT N_( \
  58     "Audio connection to use for DeckLink captures. " \
  59     "Valid choices: embedded, aesebu, analog. " \
  60     "Leave blank for card default.")
  61
  62 #define RATE_TEXT N_("Audio samplerate (Hz)")
  63 #define RATE_LONGTEXT N_( \
  64     "Audio sampling rate (in hertz) for DeckLink captures. " \
  65     "0 disables audio input.")
  66
  67 #define CHANNELS_TEXT N_("Number of audio channels")
  68 #define CHANNELS_LONGTEXT N_( \
  69     "Number of input audio channels for DeckLink captures. " \
  70     "Must be 2, 8 or 16. 0 disables audio input.")
  71
  72 #define VIDEO_CONNECTION_TEXT N_("Video connection")
  73 #define VIDEO_CONNECTION_LONGTEXT N_( \
  74     "Video connection to use for DeckLink captures. " \
  75     "Valid choices: sdi, hdmi, opticalsdi, component, " \
  76     "composite, svideo. " \
  77     "Leave blank for card default.")
  78
  79 static const char *const ppsz_videoconns[] = {
  80     "sdi", "hdmi", "opticalsdi", "component", "composite", "svideo"
  81 };
  82 static const char *const ppsz_videoconns_text[] = {
  83     N_("SDI"), N_("HDMI"), N_("Optical SDI"), N_("Component"), N_("Composite"), N_("S-Video")
  84 };
  85
  86 static const char *const ppsz_audioconns[] = {
  87     "embedded", "aesebu", "analog"
  88 };
  89 static const char *const ppsz_audioconns_text[] = {
  90     N_("Embedded"), N_("AES/EBU"), N_("Analog")
  91 };
  92
  93 #define ASPECT_RATIO_TEXT N_("Aspect ratio")
  94 #define ASPECT_RATIO_LONGTEXT N_(\
  95     "Aspect ratio (4:3, 16:9). Default assumes square pixels.")
  96
  97 vlc_module_begin ()
  98     set_shortname(N_("DeckLink"))
  99     set_description(N_("Blackmagic DeckLink SDI input"))
 100     set_category(CAT_INPUT)
 101     set_subcategory(SUBCAT_INPUT_ACCESS)
 102
 103     add_integer("decklink-card-index", 0,
 104                  CARD_INDEX_TEXT, CARD_INDEX_LONGTEXT, true)
 105     add_string("decklink-mode", NULL,
 106                  MODE_TEXT, MODE_LONGTEXT, true)
 107     add_string("decklink-audio-connection", 0,
 108                  AUDIO_CONNECTION_TEXT, AUDIO_CONNECTION_LONGTEXT, true)
 109         change_string_list(ppsz_audioconns, ppsz_audioconns_text)
 110     add_integer("decklink-audio-rate", 48000,
 111                  RATE_TEXT, RATE_LONGTEXT, true)
 112     add_integer("decklink-audio-channels", 2,
 113                  CHANNELS_TEXT, CHANNELS_LONGTEXT, true)
 114     add_string("decklink-video-connection", 0,
 115                  VIDEO_CONNECTION_TEXT, VIDEO_CONNECTION_LONGTEXT, true)
 116         change_string_list(ppsz_videoconns, ppsz_videoconns_text)
 117     add_string("decklink-aspect-ratio", NULL,
 118                 ASPECT_RATIO_TEXT, ASPECT_RATIO_LONGTEXT, true)
 119     add_bool("decklink-tenbits", false, N_("10 bits"), N_("10 bits"), true)
 120
 121     add_shortcut("decklink")
 122     set_capability("access_demux", 0)
 123     set_callbacks(Open, Close)
 124 vlc_module_end ()
 125
 126 static int Control(demux_t *, int, va_list);
 127
 128 class DeckLinkCaptureDelegate;
 129
 130 struct demux_sys_t
 131 {
 132     IDeckLink *card;
 133     IDeckLinkInput *input;
 134     DeckLinkCaptureDelegate *delegate;
 135
 136     /* We need to hold onto the IDeckLinkConfiguration object, or our settings will not apply.
 137        See section 2.4.15 of the Blackmagic DeckLink SDK documentation. */
 138     IDeckLinkConfiguration *config;
 139     IDeckLinkAttributes *attributes;
 140
 141     bool autodetect;
 142
 143     es_out_id_t *video_es;
 144     es_format_t video_fmt;
 145     es_out_id_t *audio_es;
 146     es_out_id_t *cc_es;
 147
 148     vlc_mutex_t pts_lock;
 149     int last_pts;  /* protected by <pts_lock> */
 150
 151     uint32_t dominance_flags;
 152     int channels;
 153
 154     bool tenbits;
 155 };
 156
 157 static const char *GetFieldDominance(BMDFieldDominance dom, uint32_t *flags)
 158 {
 159     switch(dom)
 160     {
 161         case bmdProgressiveFrame:
 162             return "";
 163         case bmdProgressiveSegmentedFrame:
 164             return ", segmented";
 165         case bmdLowerFieldFirst:
 166             *flags = BLOCK_FLAG_BOTTOM_FIELD_FIRST;
 167             return ", interlaced [BFF]";
 168         case bmdUpperFieldFirst:
 169             *flags = BLOCK_FLAG_TOP_FIELD_FIRST;
 170             return ", interlaced [TFF]";
 171         case bmdUnknownFieldDominance:
 172         default:
 173             return ", unknown field dominance";
 174     }
 175 }
 176
 177 static es_format_t GetModeSettings(demux_t *demux, IDeckLinkDisplayMode *m,
 178         BMDDetectedVideoInputFormatFlags fmt_flags)
 179 {
 180     demux_sys_t *sys = (demux_sys_t *)demux->p_sys;
 181     uint32_t flags = 0;
 182     (void)GetFieldDominance(m->GetFieldDominance(), &flags);
 183
 184     BMDTimeValue frame_duration, time_scale;
 185     if (m->GetFrameRate(&frame_duration, &time_scale) != S_OK) {
 186         time_scale = 0;
 187         frame_duration = 1;
 188     }
 189
 190     es_format_t video_fmt;
 191     vlc_fourcc_t chroma = 0;
 192     switch (fmt_flags) {
 193         case bmdDetectedVideoInputYCbCr422:
 194             chroma = sys->tenbits ? VLC_CODEC_I422_10L : VLC_CODEC_UYVY;
 195             break;
 196         case bmdDetectedVideoInputRGB444:
 197             chroma = VLC_CODEC_ARGB;
 198             break;
 199         default:
 200             msg_Err(demux, "Unsupported input format");
 201             break;
 202     }
 203     es_format_Init(&video_fmt, VIDEO_ES, chroma);
 204
 205     video_fmt.video.i_chroma = chroma;
 206     video_fmt.video.i_width = m->GetWidth();
 207     video_fmt.video.i_height = m->GetHeight();
 208     video_fmt.video.i_sar_num = 1;
 209     video_fmt.video.i_sar_den = 1;
 210     video_fmt.video.i_frame_rate = time_scale;
 211     video_fmt.video.i_frame_rate_base = frame_duration;
 212     video_fmt.i_bitrate = video_fmt.video.i_width * video_fmt.video.i_height * video_fmt.video.i_frame_rate * 2 * 8;
 213
 214     unsigned aspect_num, aspect_den;
 215     if (!var_InheritURational(demux, &aspect_num, &aspect_den, "decklink-aspect-ratio") &&
 216          aspect_num > 0 && aspect_den > 0) {
 217         video_fmt.video.i_sar_num = aspect_num * video_fmt.video.i_height;
 218         video_fmt.video.i_sar_den = aspect_den * video_fmt.video.i_width;
 219     }
 220
 221     sys->dominance_flags = flags;
 222
 223     return video_fmt;
 224 }
 225
 226 class DeckLinkCaptureDelegate : public IDeckLinkInputCallback
 227 {
 228 public:
 229     DeckLinkCaptureDelegate(demux_t *demux) : demux_(demux)
 230     {
 231         m_ref_.store(1);
 232     }
 233
 234     virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID, LPVOID *) { return E_NOINTERFACE; }
 235
 236     virtual ULONG STDMETHODCALLTYPE AddRef(void)
 237     {
 238         return m_ref_.fetch_add(1);
 239     }
 240
 241     virtual ULONG STDMETHODCALLTYPE Release(void)
 242     {
 243         uintptr_t new_ref = m_ref_.fetch_sub(1);
 244         if (new_ref == 0)
 245             delete this;
 246         return new_ref;
 247     }
 248
 249     virtual HRESULT STDMETHODCALLTYPE VideoInputFormatChanged(BMDVideoInputFormatChangedEvents events, IDeckLinkDisplayMode *mode, BMDDetectedVideoInputFormatFlags flags)
 250     {
 251         demux_sys_t *sys = static_cast<demux_sys_t *>(demux_->p_sys);
 252
 253         if( !(events & bmdVideoInputDisplayModeChanged ))
 254             return S_OK;
 255
 256         const char *mode_name;
 257         if (mode->GetName(&mode_name) != S_OK)
 258             mode_name = "unknown";
 259
 260         msg_Dbg(demux_, "Video input format changed to %s", mode_name);
 261         if (!sys->autodetect) {
 262             msg_Err(demux_, "Video format detection disabled");
 263             return S_OK;
 264         }
 265
 266         BMDPixelFormat fmt = 0;
 267         switch (flags) {
 268             case bmdDetectedVideoInputYCbCr422:
 269                 fmt = sys->tenbits ? bmdFormat10BitYUV : bmdFormat8BitYUV;
 270                 break;
 271             case bmdDetectedVideoInputRGB444:
 272                 fmt = bmdFormat8BitARGB;
 273                 break;
 274             default:
 275                 msg_Err(demux_, "Unsupported input format");
 276                 return S_OK;
 277         }
 278
 279         es_out_Del(demux_->out, sys->video_es);
 280         sys->video_fmt = GetModeSettings(demux_, mode, flags);
 281         sys->video_es = es_out_Add(demux_->out, &sys->video_fmt);
 282
 283         sys->input->PauseStreams();
 284         sys->input->EnableVideoInput( mode->GetDisplayMode(), fmt, bmdVideoInputEnableFormatDetection );
 285         sys->input->FlushStreams();
 286         sys->input->StartStreams();
 287
 288         return S_OK;
 289     }
 290
 291     virtual HRESULT STDMETHODCALLTYPE VideoInputFrameArrived(IDeckLinkVideoInputFrame*, IDeckLinkAudioInputPacket*);
 292
 293 private:
 294     std::atomic_uint m_ref_;
 295     demux_t *demux_;
 296 };
 297
 298 HRESULT DeckLinkCaptureDelegate::VideoInputFrameArrived(IDeckLinkVideoInputFrame* videoFrame, IDeckLinkAudioInputPacket* audioFrame)
 299 {
 300     demux_sys_t *sys = static_cast<demux_sys_t *>(demux_->p_sys);
 301
 302     if (videoFrame) {
 303         if (videoFrame->GetFlags() & bmdFrameHasNoInputSource) {
 304             msg_Warn(demux_, "No input signal detected (%dx%d)",
 305                             videoFrame->GetWidth(), videoFrame->GetHeight());
 306             return S_OK;
 307         }
 308
 309         const int width = videoFrame->GetWidth();
 310         const int height = videoFrame->GetHeight();
 311         const int stride = videoFrame->GetRowBytes();
 312
 313         int bpp = 0;
 314         switch (sys->video_fmt.i_codec) {
 315             case VLC_CODEC_I422_10L:
 316             case VLC_CODEC_ARGB:
 317                 bpp = 4;
 318                 break;
 319             case VLC_CODEC_UYVY:
 320                 bpp = 2;
 321                 break;
 322         };
 323         block_t *video_frame = block_Alloc(width * height * bpp);
 324         if (!video_frame)
 325             return S_OK;
 326
 327         const uint32_t *frame_bytes;
 328         videoFrame->GetBytes((void**)&frame_bytes);
 329
 330         BMDTimeValue stream_time, frame_duration;
 331         videoFrame->GetStreamTime(&stream_time, &frame_duration, CLOCK_FREQ);
 332         video_frame->i_flags = BLOCK_FLAG_TYPE_I | sys->dominance_flags;
 333         video_frame->i_pts = video_frame->i_dts = VLC_TS_0 + stream_time;
 334
 335         if (sys->video_fmt.i_codec == VLC_CODEC_I422_10L) {
 336             v210_convert((uint16_t*)video_frame->p_buffer, frame_bytes, width, height);
 337             IDeckLinkVideoFrameAncillary *vanc;
 338             if (videoFrame->GetAncillaryData(&vanc) == S_OK) {
 339                 for (int i = 1; i < 21; i++) {
 340                     uint32_t *buf;
 341                     if (vanc->GetBufferForVerticalBlankingLine(i, (void**)&buf) != S_OK)
 342                         break;
 343                     uint16_t dec[width * 2];
 344                     v210_convert(&dec[0], buf, width, 1);
 345                     block_t *cc = vanc_to_cc(demux_, dec, width * 2);
 346                     if (!cc)
 347                         continue;
 348                     cc->i_pts = cc->i_dts = VLC_TS_0 + stream_time;
 349
 350                     if (!sys->cc_es) {
 351                         es_format_t fmt;
 352
 353                         es_format_Init( &fmt, SPU_ES, VLC_CODEC_CEA608 );
 354                         fmt.psz_description = strdup(N_("Closed captions 1"));
 355                         if (fmt.psz_description) {
 356                             sys->cc_es = es_out_Add(demux_->out, &fmt);
 357                             msg_Dbg(demux_, "Adding Closed captions stream");
 358                         }
 359                     }
 360                     if (sys->cc_es)
 361                         es_out_Send(demux_->out, sys->cc_es, cc);
 362                     else
 363                         block_Release(cc);
 364                     break; // we found the line with Closed Caption data
 365                 }
 366                 vanc->Release();
 367             }
 368         } else if (sys->video_fmt.i_codec == VLC_CODEC_UYVY) {
 369             for (int y = 0; y < height; ++y) {
 370                 const uint8_t *src = (const uint8_t *)frame_bytes + stride * y;
 371                 uint8_t *dst = video_frame->p_buffer + width * 2 * y;
 372                 memcpy(dst, src, width * 2);
 373             }
 374         } else {
 375                 memcpy(video_frame->p_buffer, frame_bytes, width * height * bpp);
 376         }
 377
 378         vlc_mutex_lock(&sys->pts_lock);
 379         if (video_frame->i_pts > sys->last_pts)
 380             sys->last_pts = video_frame->i_pts;
 381         vlc_mutex_unlock(&sys->pts_lock);
 382
 383         es_out_SetPCR(demux_->out, video_frame->i_pts);
 384         es_out_Send(demux_->out, sys->video_es, video_frame);
 385     }
 386
 387     if (audioFrame) {
 388         const int bytes = audioFrame->GetSampleFrameCount() * sizeof(int16_t) * sys->channels;
 389
 390         block_t *audio_frame = block_Alloc(bytes);
 391         if (!audio_frame)
 392             return S_OK;
 393
 394         void *frame_bytes;
 395         audioFrame->GetBytes(&frame_bytes);
 396         memcpy(audio_frame->p_buffer, frame_bytes, bytes);
 397
 398         BMDTimeValue packet_time;
 399         audioFrame->GetPacketTime(&packet_time, CLOCK_FREQ);
 400         audio_frame->i_pts = audio_frame->i_dts = VLC_TS_0 + packet_time;
 401
 402         vlc_mutex_lock(&sys->pts_lock);
 403         if (audio_frame->i_pts > sys->last_pts)
 404             sys->last_pts = audio_frame->i_pts;
 405         vlc_mutex_unlock(&sys->pts_lock);
 406
 407         es_out_SetPCR(demux_->out, audio_frame->i_pts);
 408         es_out_Send(demux_->out, sys->audio_es, audio_frame);
 409     }
 410
 411     return S_OK;
 412 }
 413
 414
 415 static int GetAudioConn(demux_t *demux)
 416 {
 417     demux_sys_t *sys = (demux_sys_t *)demux->p_sys;
 418
 419     char *opt = var_CreateGetNonEmptyString(demux, "decklink-audio-connection");
 420     if (!opt)
 421         return VLC_SUCCESS;
 422
 423     BMDAudioConnection c;
 424     if (!strcmp(opt, "embedded"))
 425         c = bmdAudioConnectionEmbedded;
 426     else if (!strcmp(opt, "aesebu"))
 427         c = bmdAudioConnectionAESEBU;
 428     else if (!strcmp(opt, "analog"))
 429         c = bmdAudioConnectionAnalog;
 430     else {
 431         msg_Err(demux, "Invalid audio-connection: `%s\' specified", opt);
 432         free(opt);
 433         return VLC_EGENERIC;
 434     }
 435
 436     if (sys->config->SetInt(bmdDeckLinkConfigAudioInputConnection, c) != S_OK) {
 437         msg_Err(demux, "Failed to set audio input connection");
 438         return VLC_EGENERIC;
 439     }
 440
 441     return VLC_SUCCESS;
 442 }
 443
 444 static int GetVideoConn(demux_t *demux)
 445 {
 446     demux_sys_t *sys = (demux_sys_t *)demux->p_sys;
 447
 448     char *opt = var_InheritString(demux, "decklink-video-connection");
 449     if (!opt)
 450         return VLC_SUCCESS;
 451
 452     BMDVideoConnection c;
 453     if (!strcmp(opt, "sdi"))
 454         c = bmdVideoConnectionSDI;
 455     else if (!strcmp(opt, "hdmi"))
 456         c = bmdVideoConnectionHDMI;
 457     else if (!strcmp(opt, "opticalsdi"))
 458         c = bmdVideoConnectionOpticalSDI;
 459     else if (!strcmp(opt, "component"))
 460         c = bmdVideoConnectionComponent;
 461     else if (!strcmp(opt, "composite"))
 462         c = bmdVideoConnectionComposite;
 463     else if (!strcmp(opt, "svideo"))
 464         c = bmdVideoConnectionSVideo;
 465     else {
 466         msg_Err(demux, "Invalid video-connection: `%s\' specified", opt);
 467         free(opt);
 468         return VLC_EGENERIC;
 469     }
 470
 471     free(opt);
 472     if (sys->config->SetInt(bmdDeckLinkConfigVideoInputConnection, c) != S_OK) {
 473         msg_Err(demux, "Failed to set video input connection");
 474         return VLC_EGENERIC;
 475     }
 476
 477     return VLC_SUCCESS;
 478 }
 479
 480 static int Open(vlc_object_t *p_this)
 481 {
 482     demux_t     *demux = (demux_t*)p_this;
 483     demux_sys_t *sys;
 484     int         ret = VLC_EGENERIC;
 485     int         card_index;
 486     int         physical_channels = 0;
 487     int         rate;
 488     BMDVideoInputFlags flags = bmdVideoInputFlagDefault;
 489
 490     /* Set up demux */
 491     demux->pf_demux = NULL;
 492     demux->pf_control = Control;
 493     demux->p_sys = sys = (demux_sys_t*)calloc(1, sizeof(demux_sys_t));
 494     if (!sys)
 495         return VLC_ENOMEM;
 496
 497     vlc_mutex_init(&sys->pts_lock);
 498
 499     sys->tenbits = var_InheritBool(p_this, "decklink-tenbits");
 500
 501     IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
 502     if (!decklink_iterator) {
 503         msg_Err(demux, "DeckLink drivers not found.");
 504         goto finish;
 505     }
 506
 507     card_index = var_InheritInteger(demux, "decklink-card-index");
 508     if (card_index < 0) {
 509         msg_Err(demux, "Invalid card index %d", card_index);
 510         goto finish;
 511     }
 512
 513     for (int i = 0; i <= card_index; i++) {
 514         if (sys->card)
 515             sys->card->Release();
 516         if (decklink_iterator->Next(&sys->card) != S_OK) {
 517             msg_Err(demux, "DeckLink PCI card %d not found", card_index);
 518             goto finish;
 519         }
 520     }
 521
 522     const char *model_name;
 523     if (sys->card->GetModelName(&model_name) != S_OK)
 524         model_name = "unknown";
 525
 526     msg_Dbg(demux, "Opened DeckLink PCI card %d (%s)", card_index, model_name);
 527
 528     if (sys->card->QueryInterface(IID_IDeckLinkInput, (void**)&sys->input) != S_OK) {
 529         msg_Err(demux, "Card has no inputs");
 530         goto finish;
 531     }
 532
 533     /* Set up the video and audio sources. */
 534     if (sys->card->QueryInterface(IID_IDeckLinkConfiguration, (void**)&sys->config) != S_OK) {
 535         msg_Err(demux, "Failed to get configuration interface");
 536         goto finish;
 537     }
 538
 539     if (sys->card->QueryInterface(IID_IDeckLinkAttributes, (void**)&sys->attributes) != S_OK) {
 540         msg_Err(demux, "Failed to get attributes interface");
 541         goto finish;
 542     }
 543
 544     if (GetVideoConn(demux) || GetAudioConn(demux))
 545         goto finish;
 546
 547     BMDPixelFormat fmt;
 548     fmt = sys->tenbits ? bmdFormat10BitYUV : bmdFormat8BitYUV;
 549     if (sys->attributes->GetFlag(BMDDeckLinkSupportsInputFormatDetection, &sys->autodetect) != S_OK) {
 550         msg_Err(demux, "Failed to query card attribute");
 551         goto finish;
 552     }
 553
 554     /* Get the list of display modes. */
 555     IDeckLinkDisplayModeIterator *mode_it;
 556     if (sys->input->GetDisplayModeIterator(&mode_it) != S_OK) {
 557         msg_Err(demux, "Failed to enumerate display modes");
 558         goto finish;
 559     }
 560
 561     union {
 562         BMDDisplayMode id;
 563         char str[4];
 564     } u;
 565
 566     u.id = 0;
 567
 568     char *mode;
 569     mode = var_CreateGetNonEmptyString(demux, "decklink-mode");
 570     if (mode)
 571         sys->autodetect = false; // disable autodetection if mode was set
 572
 573     if (sys->autodetect) {
 574         msg_Dbg(demux, "Card supports input format detection");
 575         flags |= bmdVideoInputEnableFormatDetection;
 576         /* Enable a random format, we will reconfigure on format detection */
 577         u.id = htonl(bmdModeHD1080p2997);
 578     } else {
 579         if (!mode || strlen(mode) < 3 || strlen(mode) > 4) {
 580             msg_Err(demux, "Invalid mode: \'%s\'", mode ? mode : "");
 581             free(mode);
 582             goto finish;
 583         }
 584
 585         msg_Dbg(demux, "Looking for mode \'%s\'", mode);
 586         memcpy(u.str, mode, 4);
 587         if (u.str[3] == '\0')
 588             u.str[3] = ' '; /* 'pal'\0 -> 'pal ' */
 589         free(mode);
 590     }
 591
 592     sys->video_fmt.video.i_width = 0;
 593
 594     for (IDeckLinkDisplayMode *m;; m->Release()) {
 595         if ((mode_it->Next(&m) != S_OK) || !m)
 596             break;
 597
 598         const char *mode_name;
 599         BMDTimeValue frame_duration, time_scale;
 600         uint32_t field_flags;
 601         const char *field = GetFieldDominance(m->GetFieldDominance(), &field_flags);
 602         BMDDisplayMode id = ntohl(m->GetDisplayMode());
 603
 604         if (m->GetName(&mode_name) != S_OK)
 605             mode_name = "unknown";
 606         if (m->GetFrameRate(&frame_duration, &time_scale) != S_OK) {
 607             time_scale = 0;
 608             frame_duration = 1;
 609         }
 610
 611         msg_Dbg(demux, "Found mode '%4.4s': %s (%dx%d, %.3f fps%s)",
 612                  (char*)&id, mode_name,
 613                  (int)m->GetWidth(), (int)m->GetHeight(),
 614                  double(time_scale) / frame_duration, field);
 615
 616         if (u.id == id) {
 617             sys->video_fmt = GetModeSettings(demux, m, bmdDetectedVideoInputYCbCr422);
 618             msg_Dbg(demux, "Using that mode");
 619         }
 620     }
 621
 622     mode_it->Release();
 623
 624     if (sys->video_fmt.video.i_width == 0) {
 625         msg_Err(demux, "Unknown video mode `%4.4s\' specified.", (char*)&u.id);
 626         goto finish;
 627     }
 628
 629     if (sys->input->EnableVideoInput(htonl(u.id), fmt, flags) != S_OK) {
 630         msg_Err(demux, "Failed to enable video input");
 631         goto finish;
 632     }
 633
 634     /* Set up audio. */
 635     sys->channels = var_InheritInteger(demux, "decklink-audio-channels");
 636     switch (sys->channels) {
 637     case 0:
 638         break;
 639     case 2:
 640         physical_channels = AOUT_CHANS_STEREO;
 641         break;
 642     case 8:
 643         physical_channels = AOUT_CHANS_7_1;
 644         break;
 645     //case 16:
 646     default:
 647         msg_Err(demux, "Invalid number of channels (%d), disabling audio", sys->channels);
 648         sys->channels = 0;
 649     }
 650     rate = var_InheritInteger(demux, "decklink-audio-rate");
 651     if (rate > 0 && sys->channels > 0) {
 652         if (sys->input->EnableAudioInput(rate, bmdAudioSampleType16bitInteger, sys->channels) != S_OK) {
 653             msg_Err(demux, "Failed to enable audio input");
 654             goto finish;
 655         }
 656     }
 657
 658     sys->delegate = new DeckLinkCaptureDelegate(demux);
 659     sys->input->SetCallback(sys->delegate);
 660
 661     if (sys->input->StartStreams() != S_OK) {
 662         msg_Err(demux, "Could not start streaming from SDI card. This could be caused "
 663                           "by invalid video mode or flags, access denied, or card already in use.");
 664         goto finish;
 665     }
 666
 667     msg_Dbg(demux, "added new video es %4.4s %dx%d",
 668              (char*)&sys->video_fmt.i_codec, sys->video_fmt.video.i_width, sys->video_fmt.video.i_height);
 669     sys->video_es = es_out_Add(demux->out, &sys->video_fmt);
 670
 671     es_format_t audio_fmt;
 672     es_format_Init(&audio_fmt, AUDIO_ES, VLC_CODEC_S16N);
 673     audio_fmt.audio.i_channels = sys->channels;
 674     audio_fmt.audio.i_physical_channels = physical_channels;
 675     audio_fmt.audio.i_rate = rate;
 676     audio_fmt.audio.i_bitspersample = 16;
 677     audio_fmt.audio.i_blockalign = audio_fmt.audio.i_channels * audio_fmt.audio.i_bitspersample / 8;
 678     audio_fmt.i_bitrate = audio_fmt.audio.i_channels * audio_fmt.audio.i_rate * audio_fmt.audio.i_bitspersample;
 679
 680     msg_Dbg(demux, "added new audio es %4.4s %dHz %dbpp %dch",
 681              (char*)&audio_fmt.i_codec, audio_fmt.audio.i_rate, audio_fmt.audio.i_bitspersample, audio_fmt.audio.i_channels);
 682     sys->audio_es = es_out_Add(demux->out, &audio_fmt);
 683
 684     ret = VLC_SUCCESS;
 685
 686 finish:
 687     if (decklink_iterator)
 688         decklink_iterator->Release();
 689
 690     if (ret != VLC_SUCCESS)
 691         Close(p_this);
 692
 693     return ret;
 694 }
 695
 696 static void Close(vlc_object_t *p_this)
 697 {
 698     demux_t     *demux = (demux_t *)p_this;
 699     demux_sys_t *sys = (demux_sys_t *)demux->p_sys;
 700
 701     if (sys->attributes)
 702         sys->attributes->Release();
 703
 704     if (sys->config)
 705         sys->config->Release();
 706
 707     if (sys->input) {
 708         sys->input->StopStreams();
 709         sys->input->Release();
 710     }
 711
 712     if (sys->card)
 713         sys->card->Release();
 714
 715     if (sys->delegate)
 716         sys->delegate->Release();
 717
 718     vlc_mutex_destroy(&sys->pts_lock);
 719     free(sys);
 720 }
 721
 722 static int Control(demux_t *demux, int query, va_list args)
 723 {
 724     demux_sys_t *sys = (demux_sys_t *)demux->p_sys;
 725     bool *pb;
 726     int64_t *pi64;
 727
 728     switch(query)
 729     {
 730         /* Special for access_demux */
 731         case DEMUX_CAN_PAUSE:
 732         case DEMUX_CAN_SEEK:
 733         case DEMUX_CAN_CONTROL_PACE:
 734             pb = va_arg(args, bool *);
 735             *pb = false;
 736             return VLC_SUCCESS;
 737
 738         case DEMUX_GET_PTS_DELAY:
 739             pi64 = va_arg(args, int64_t *);
 740             *pi64 = INT64_C(1000) * var_InheritInteger(demux, "live-caching");
 741             return VLC_SUCCESS;
 742
 743         case DEMUX_GET_TIME:
 744             pi64 = va_arg(args, int64_t *);
 745             vlc_mutex_lock(&sys->pts_lock);
 746             *pi64 = sys->last_pts;
 747             vlc_mutex_unlock(&sys->pts_lock);
 748             return VLC_SUCCESS;
 749
 750         default:
 751             return VLC_EGENERIC;
 752     }
 753 }