libavdevice/decklink_common.cpp

   1 /*
   2  * Blackmagic DeckLink output
   3  * Copyright (c) 2013-2014 Ramiro Polla, Luca Barbato, Deti Fliegl
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /* Include internal.h first to avoid conflict between winsock.h (used by
  23  * DeckLink headers) and winsock2.h (used by libavformat) in MSVC++ builds */
  24 extern "C" {
  25 #include "libavformat/internal.h"
  26 }
  27
  28 #include <DeckLinkAPI.h>
  29 #ifdef _WIN32
  30 #include <DeckLinkAPI_i.c>
  31 #else
  32 /* The file provided by the SDK is known to be missing prototypes, which doesn't
  33    cause issues with GCC since the warning doesn't apply to C++ files.  However
  34    Clang does complain (and warnings are treated as errors), so suppress the
  35    warning just for this one file */
  36 #ifdef __clang__
  37 #pragma clang diagnostic push
  38 #pragma clang diagnostic ignored "-Wmissing-prototypes"
  39 #endif
  40 #include <DeckLinkAPIDispatch.cpp>
  41 #ifdef __clang__
  42 #pragma clang diagnostic pop
  43 #endif
  44 #endif
  45
  46 extern "C" {
  47 #include "libavformat/avformat.h"
  48 #include "libavutil/imgutils.h"
  49 #include "libavutil/intreadwrite.h"
  50 #include "libavutil/bswap.h"
  51 #include "avdevice.h"
  52 }
  53
  54 #include "decklink_common.h"
  55
  56 static IDeckLinkIterator *decklink_create_iterator(AVFormatContext *avctx)
  57 {
  58     IDeckLinkIterator *iter;
  59
  60 #ifdef _WIN32
  61     if (CoInitialize(NULL) < 0) {
  62         av_log(avctx, AV_LOG_ERROR, "COM initialization failed.\n");
  63         return NULL;
  64     }
  65
  66     if (CoCreateInstance(CLSID_CDeckLinkIterator, NULL, CLSCTX_ALL,
  67                          IID_IDeckLinkIterator, (void**) &iter) != S_OK) {
  68         iter = NULL;
  69     }
  70 #else
  71     iter = CreateDeckLinkIteratorInstance();
  72 #endif
  73     if (!iter)
  74         av_log(avctx, AV_LOG_ERROR, "Could not create DeckLink iterator. "
  75                                     "Make sure you have DeckLink drivers " BLACKMAGIC_DECKLINK_API_VERSION_STRING " or newer installed.\n");
  76
  77     return iter;
  78 }
  79
  80 static int decklink_get_attr_string(IDeckLink *dl, BMDDeckLinkAttributeID cfg_id, const char **s)
  81 {
  82     DECKLINK_STR tmp;
  83     HRESULT hr;
  84     IDeckLinkProfileAttributes *attr;
  85     *s = NULL;
  86     if (dl->QueryInterface(IID_IDeckLinkProfileAttributes, (void **)&attr) != S_OK)
  87         return AVERROR_EXTERNAL;
  88     hr = attr->GetString(cfg_id, &tmp);
  89     attr->Release();
  90     if (hr == S_OK) {
  91         *s = DECKLINK_STRDUP(tmp);
  92         DECKLINK_FREE(tmp);
  93         if (!*s)
  94             return AVERROR(ENOMEM);
  95     } else if (hr == E_FAIL) {
  96         return AVERROR_EXTERNAL;
  97     }
  98     return 0;
  99 }
 100
 101 static int decklink_select_input(AVFormatContext *avctx, BMDDeckLinkConfigurationID cfg_id)
 102 {
 103     struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
 104     struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;
 105     BMDDeckLinkAttributeID attr_id = (cfg_id == bmdDeckLinkConfigAudioInputConnection) ? BMDDeckLinkAudioInputConnections : BMDDeckLinkVideoInputConnections;
 106     int64_t bmd_input              = (cfg_id == bmdDeckLinkConfigAudioInputConnection) ? (int64_t)ctx->audio_input : (int64_t)ctx->video_input;
 107     const char *type_name          = (cfg_id == bmdDeckLinkConfigAudioInputConnection) ? "audio" : "video";
 108     int64_t supported_connections = 0;
 109     HRESULT res;
 110
 111     if (bmd_input) {
 112         res = ctx->attr->GetInt(attr_id, &supported_connections);
 113         if (res != S_OK) {
 114             av_log(avctx, AV_LOG_ERROR, "Failed to query supported %s inputs.\n", type_name);
 115             return AVERROR_EXTERNAL;
 116         }
 117         if ((supported_connections & bmd_input) != bmd_input) {
 118             av_log(avctx, AV_LOG_ERROR, "Device does not support selected %s input.\n", type_name);
 119             return AVERROR(ENOSYS);
 120         }
 121         res = ctx->cfg->SetInt(cfg_id, bmd_input);
 122         if (res != S_OK) {
 123             av_log(avctx, AV_LOG_ERROR, "Failed to select %s input.\n", type_name);
 124             return AVERROR_EXTERNAL;
 125         }
 126     }
 127     return 0;
 128 }
 129
 130 static DECKLINK_BOOL field_order_eq(enum AVFieldOrder field_order, BMDFieldDominance bmd_field_order)
 131 {
 132     if (field_order == AV_FIELD_UNKNOWN)
 133         return true;
 134     if ((field_order == AV_FIELD_TT || field_order == AV_FIELD_TB) && bmd_field_order == bmdUpperFieldFirst)
 135         return true;
 136     if ((field_order == AV_FIELD_BB || field_order == AV_FIELD_BT) && bmd_field_order == bmdLowerFieldFirst)
 137         return true;
 138     if (field_order == AV_FIELD_PROGRESSIVE && (bmd_field_order == bmdProgressiveFrame || bmd_field_order == bmdProgressiveSegmentedFrame))
 139         return true;
 140     return false;
 141 }
 142
 143 int ff_decklink_set_configs(AVFormatContext *avctx,
 144                             decklink_direction_t direction) {
 145     struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
 146     struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;
 147     HRESULT res;
 148
 149     if (ctx->duplex_mode) {
 150         DECKLINK_BOOL duplex_supported = false;
 151
 152 #if BLACKMAGIC_DECKLINK_API_VERSION >= 0x0b000000
 153         IDeckLinkProfileManager *manager = NULL;
 154         if (ctx->dl->QueryInterface(IID_IDeckLinkProfileManager, (void **)&manager) == S_OK)
 155             duplex_supported = true;
 156 #else
 157         if (ctx->attr->GetFlag(BMDDeckLinkSupportsDuplexModeConfiguration, &duplex_supported) != S_OK)
 158             duplex_supported = false;
 159 #endif
 160
 161         if (duplex_supported) {
 162 #if BLACKMAGIC_DECKLINK_API_VERSION >= 0x0b000000
 163             IDeckLinkProfile *profile = NULL;
 164             BMDProfileID bmd_profile_id = ctx->duplex_mode == 2 ? bmdProfileOneSubDeviceFullDuplex : bmdProfileTwoSubDevicesHalfDuplex;
 165             res = manager->GetProfile(bmd_profile_id, &profile);
 166             if (res == S_OK) {
 167                 res = profile->SetActive();
 168                 profile->Release();
 169             }
 170             manager->Release();
 171 #else
 172             res = ctx->cfg->SetInt(bmdDeckLinkConfigDuplexMode, ctx->duplex_mode == 2 ? bmdDuplexModeFull : bmdDuplexModeHalf);
 173 #endif
 174             if (res != S_OK)
 175                 av_log(avctx, AV_LOG_WARNING, "Setting duplex mode failed.\n");
 176             else
 177                 av_log(avctx, AV_LOG_VERBOSE, "Successfully set duplex mode to %s duplex.\n", ctx->duplex_mode == 2 ? "full" : "half");
 178         } else {
 179             av_log(avctx, AV_LOG_WARNING, "Unable to set duplex mode, because it is not supported.\n");
 180         }
 181     }
 182     if (direction == DIRECTION_IN) {
 183         int ret;
 184         ret = decklink_select_input(avctx, bmdDeckLinkConfigAudioInputConnection);
 185         if (ret < 0)
 186             return ret;
 187         ret = decklink_select_input(avctx, bmdDeckLinkConfigVideoInputConnection);
 188         if (ret < 0)
 189             return ret;
 190     }
 191     if (direction == DIRECTION_OUT && cctx->timing_offset != INT_MIN) {
 192         res = ctx->cfg->SetInt(bmdDeckLinkConfigReferenceInputTimingOffset, cctx->timing_offset);
 193         if (res != S_OK)
 194             av_log(avctx, AV_LOG_WARNING, "Setting timing offset failed.\n");
 195     }
 196     return 0;
 197 }
 198
 199 int ff_decklink_set_format(AVFormatContext *avctx,
 200                                int width, int height,
 201                                int tb_num, int tb_den,
 202                                enum AVFieldOrder field_order,
 203                                decklink_direction_t direction)
 204 {
 205     struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
 206     struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;
 207 #if BLACKMAGIC_DECKLINK_API_VERSION >= 0x0b000000
 208     DECKLINK_BOOL support;
 209 #else
 210     BMDDisplayModeSupport support;
 211 #endif
 212     IDeckLinkDisplayModeIterator *itermode;
 213     IDeckLinkDisplayMode *mode;
 214     int i = 1;
 215     HRESULT res;
 216
 217     av_log(avctx, AV_LOG_DEBUG, "Trying to find mode for frame size %dx%d, frame timing %d/%d, field order %d, direction %d, format code %s\n",
 218         width, height, tb_num, tb_den, field_order, direction, cctx->format_code ? cctx->format_code : "(unset)");
 219
 220     if (direction == DIRECTION_IN) {
 221         res = ctx->dli->GetDisplayModeIterator (&itermode);
 222     } else {
 223         res = ctx->dlo->GetDisplayModeIterator (&itermode);
 224     }
 225
 226     if (res!= S_OK) {
 227             av_log(avctx, AV_LOG_ERROR, "Could not get Display Mode Iterator\n");
 228             return AVERROR(EIO);
 229     }
 230
 231     char format_buf[] = "    ";
 232     if (cctx->format_code)
 233         memcpy(format_buf, cctx->format_code, FFMIN(strlen(cctx->format_code), sizeof(format_buf)));
 234     BMDDisplayMode target_mode = (BMDDisplayMode)AV_RB32(format_buf);
 235     AVRational target_tb = av_make_q(tb_num, tb_den);
 236     ctx->bmd_mode = bmdModeUnknown;
 237     while ((ctx->bmd_mode == bmdModeUnknown) && itermode->Next(&mode) == S_OK) {
 238         BMDTimeValue bmd_tb_num, bmd_tb_den;
 239         int bmd_width  = mode->GetWidth();
 240         int bmd_height = mode->GetHeight();
 241         BMDDisplayMode bmd_mode = mode->GetDisplayMode();
 242         BMDFieldDominance bmd_field_dominance = mode->GetFieldDominance();
 243
 244         mode->GetFrameRate(&bmd_tb_num, &bmd_tb_den);
 245         AVRational mode_tb = av_make_q(bmd_tb_num, bmd_tb_den);
 246
 247         if ((bmd_width == width &&
 248              bmd_height == height &&
 249              !av_cmp_q(mode_tb, target_tb) &&
 250              field_order_eq(field_order, bmd_field_dominance))
 251              || target_mode == bmd_mode) {
 252             ctx->bmd_mode   = bmd_mode;
 253             ctx->bmd_width  = bmd_width;
 254             ctx->bmd_height = bmd_height;
 255             ctx->bmd_tb_den = bmd_tb_den;
 256             ctx->bmd_tb_num = bmd_tb_num;
 257             ctx->bmd_field_dominance = bmd_field_dominance;
 258             av_log(avctx, AV_LOG_INFO, "Found Decklink mode %d x %d with rate %.2f%s\n",
 259                 bmd_width, bmd_height, 1/av_q2d(mode_tb),
 260                 (ctx->bmd_field_dominance==bmdLowerFieldFirst || ctx->bmd_field_dominance==bmdUpperFieldFirst)?"(i)":"");
 261         }
 262
 263         mode->Release();
 264         i++;
 265     }
 266
 267     itermode->Release();
 268
 269     if (ctx->bmd_mode == bmdModeUnknown)
 270         return -1;
 271
 272 #if BLACKMAGIC_DECKLINK_API_VERSION >= 0x0b050000
 273     if (direction == DIRECTION_IN) {
 274         BMDDisplayMode actualMode = ctx->bmd_mode;
 275         if (ctx->dli->DoesSupportVideoMode(ctx->video_input, ctx->bmd_mode, (BMDPixelFormat) cctx->raw_format,
 276                                            bmdNoVideoInputConversion, bmdSupportedVideoModeDefault,
 277                                            &actualMode, &support) != S_OK || !support || ctx->bmd_mode != actualMode)
 278             return -1;
 279     } else {
 280         BMDDisplayMode actualMode = ctx->bmd_mode;
 281         if (ctx->dlo->DoesSupportVideoMode(bmdVideoConnectionUnspecified, ctx->bmd_mode, ctx->raw_format,
 282                                            bmdNoVideoOutputConversion, bmdSupportedVideoModeDefault,
 283                                            &actualMode, &support) != S_OK || !support || ctx->bmd_mode != actualMode)
 284             return -1;
 285     }
 286     return 0;
 287 #elif BLACKMAGIC_DECKLINK_API_VERSION >= 0x0b000000
 288     if (direction == DIRECTION_IN) {
 289         if (ctx->dli->DoesSupportVideoMode(ctx->video_input, ctx->bmd_mode, (BMDPixelFormat) cctx->raw_format,
 290                                            bmdSupportedVideoModeDefault,
 291                                            &support) != S_OK)
 292             return -1;
 293     } else {
 294         BMDDisplayMode actualMode = ctx->bmd_mode;
 295         if (ctx->dlo->DoesSupportVideoMode(bmdVideoConnectionUnspecified, ctx->bmd_mode, ctx->raw_format,
 296                                            bmdSupportedVideoModeDefault,
 297                                            &actualMode, &support) != S_OK || !support || ctx->bmd_mode != actualMode) {
 298             return -1;
 299         }
 300
 301     }
 302     if (support)
 303         return 0;
 304 #else
 305     if (direction == DIRECTION_IN) {
 306         if (ctx->dli->DoesSupportVideoMode(ctx->bmd_mode, (BMDPixelFormat) cctx->raw_format,
 307                                            bmdVideoOutputFlagDefault,
 308                                            &support, NULL) != S_OK)
 309             return -1;
 310     } else {
 311         if (!ctx->supports_vanc || ctx->dlo->DoesSupportVideoMode(ctx->bmd_mode, ctx->raw_format,
 312                                                                   bmdVideoOutputVANC,
 313                                                                   &support, NULL) != S_OK || support != bmdDisplayModeSupported) {
 314             /* Try without VANC enabled */
 315             if (ctx->dlo->DoesSupportVideoMode(ctx->bmd_mode, ctx->raw_format,
 316                                                bmdVideoOutputFlagDefault,
 317                                                &support, NULL) != S_OK) {
 318                 return -1;
 319             }
 320             ctx->supports_vanc = 0;
 321         }
 322
 323     }
 324     if (support == bmdDisplayModeSupported)
 325         return 0;
 326 #endif
 327
 328     return -1;
 329 }
 330
 331 int ff_decklink_set_format(AVFormatContext *avctx, decklink_direction_t direction) {
 332     return ff_decklink_set_format(avctx, 0, 0, 0, 0, AV_FIELD_UNKNOWN, direction);
 333 }
 334
 335 int ff_decklink_list_devices(AVFormatContext *avctx,
 336                              struct AVDeviceInfoList *device_list,
 337                              int show_inputs, int show_outputs)
 338 {
 339     IDeckLink *dl = NULL;
 340     IDeckLinkIterator *iter = decklink_create_iterator(avctx);
 341     int ret = 0;
 342
 343     if (!iter)
 344         return AVERROR(EIO);
 345
 346     while (ret == 0 && iter->Next(&dl) == S_OK) {
 347         IDeckLinkOutput *output_config;
 348         IDeckLinkInput *input_config;
 349         const char *display_name = NULL;
 350         const char *unique_name = NULL;
 351         AVDeviceInfo *new_device = NULL;
 352         int add = 0;
 353
 354         ret = decklink_get_attr_string(dl, BMDDeckLinkDisplayName, &display_name);
 355         if (ret < 0)
 356             goto next;
 357         ret = decklink_get_attr_string(dl, BMDDeckLinkDeviceHandle, &unique_name);
 358         if (ret < 0)
 359             goto next;
 360
 361         if (show_outputs) {
 362             if (dl->QueryInterface(IID_IDeckLinkOutput, (void **)&output_config) == S_OK) {
 363                 output_config->Release();
 364                 add = 1;
 365             }
 366         }
 367
 368         if (show_inputs) {
 369             if (dl->QueryInterface(IID_IDeckLinkInput, (void **)&input_config) == S_OK) {
 370                 input_config->Release();
 371                 add = 1;
 372             }
 373         }
 374
 375         if (add == 1) {
 376             new_device = (AVDeviceInfo *) av_mallocz(sizeof(AVDeviceInfo));
 377             if (!new_device) {
 378                 ret = AVERROR(ENOMEM);
 379                 goto next;
 380             }
 381
 382             new_device->device_name = av_strdup(unique_name ? unique_name : display_name);
 383             new_device->device_description = av_strdup(display_name);
 384
 385             if (!new_device->device_name ||
 386                 !new_device->device_description ||
 387                 av_dynarray_add_nofree(&device_list->devices, &device_list->nb_devices, new_device) < 0) {
 388                 ret = AVERROR(ENOMEM);
 389                 av_freep(&new_device->device_name);
 390                 av_freep(&new_device->device_description);
 391                 av_freep(&new_device);
 392                 goto next;
 393             }
 394         }
 395
 396     next:
 397         av_freep(&display_name);
 398         av_freep(&unique_name);
 399         dl->Release();
 400     }
 401     iter->Release();
 402     return ret;
 403 }
 404
 405 /* This is a wrapper around the ff_decklink_list_devices() which dumps the
 406    output to av_log() and exits (for backward compatibility with the
 407    "-list_devices" argument). */
 408 void ff_decklink_list_devices_legacy(AVFormatContext *avctx,
 409                                      int show_inputs, int show_outputs)
 410 {
 411     struct AVDeviceInfoList *device_list = NULL;
 412     int ret;
 413
 414     device_list = (struct AVDeviceInfoList *) av_mallocz(sizeof(AVDeviceInfoList));
 415     if (!device_list)
 416         return;
 417
 418     ret = ff_decklink_list_devices(avctx, device_list, show_inputs, show_outputs);
 419     if (ret == 0) {
 420         av_log(avctx, AV_LOG_INFO, "Blackmagic DeckLink %s devices:\n",
 421                show_inputs ? "input" : "output");
 422         for (int i = 0; i < device_list->nb_devices; i++) {
 423             av_log(avctx, AV_LOG_INFO, "\t'%s'\n", device_list->devices[i]->device_description);
 424         }
 425     }
 426     avdevice_free_list_devices(&device_list);
 427 }
 428
 429 int ff_decklink_list_formats(AVFormatContext *avctx, decklink_direction_t direction)
 430 {
 431     struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
 432     struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;
 433     IDeckLinkDisplayModeIterator *itermode;
 434     IDeckLinkDisplayMode *mode;
 435     uint32_t format_code;
 436     HRESULT res;
 437
 438     if (direction == DIRECTION_IN) {
 439         int ret;
 440         ret = decklink_select_input(avctx, bmdDeckLinkConfigAudioInputConnection);
 441         if (ret < 0)
 442             return ret;
 443         ret = decklink_select_input(avctx, bmdDeckLinkConfigVideoInputConnection);
 444         if (ret < 0)
 445             return ret;
 446         res = ctx->dli->GetDisplayModeIterator (&itermode);
 447     } else {
 448         res = ctx->dlo->GetDisplayModeIterator (&itermode);
 449     }
 450
 451     if (res!= S_OK) {
 452             av_log(avctx, AV_LOG_ERROR, "Could not get Display Mode Iterator\n");
 453             return AVERROR(EIO);
 454     }
 455
 456     av_log(avctx, AV_LOG_INFO, "Supported formats for '%s':\n\tformat_code\tdescription",
 457                avctx->url);
 458     while (itermode->Next(&mode) == S_OK) {
 459         BMDTimeValue tb_num, tb_den;
 460         mode->GetFrameRate(&tb_num, &tb_den);
 461         format_code = av_bswap32(mode->GetDisplayMode());
 462         av_log(avctx, AV_LOG_INFO, "\n\t%.4s\t\t%ldx%ld at %d/%d fps",
 463                 (char*) &format_code, mode->GetWidth(), mode->GetHeight(),
 464                 (int) tb_den, (int) tb_num);
 465         switch (mode->GetFieldDominance()) {
 466         case bmdLowerFieldFirst:
 467         av_log(avctx, AV_LOG_INFO, " (interlaced, lower field first)"); break;
 468         case bmdUpperFieldFirst:
 469         av_log(avctx, AV_LOG_INFO, " (interlaced, upper field first)"); break;
 470         }
 471         mode->Release();
 472     }
 473     av_log(avctx, AV_LOG_INFO, "\n");
 474
 475     itermode->Release();
 476
 477     return 0;
 478 }
 479
 480 void ff_decklink_cleanup(AVFormatContext *avctx)
 481 {
 482     struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
 483     struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;
 484
 485     if (ctx->dli)
 486         ctx->dli->Release();
 487     if (ctx->dlo)
 488         ctx->dlo->Release();
 489     if (ctx->attr)
 490         ctx->attr->Release();
 491     if (ctx->cfg)
 492         ctx->cfg->Release();
 493     if (ctx->dl)
 494         ctx->dl->Release();
 495 }
 496
 497 int ff_decklink_init_device(AVFormatContext *avctx, const char* name)
 498 {
 499     struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
 500     struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;
 501     IDeckLink *dl = NULL;
 502     IDeckLinkIterator *iter = decklink_create_iterator(avctx);
 503     if (!iter)
 504         return AVERROR_EXTERNAL;
 505
 506     while (iter->Next(&dl) == S_OK) {
 507         const char *display_name = NULL;
 508         const char *unique_name = NULL;
 509         decklink_get_attr_string(dl, BMDDeckLinkDisplayName, &display_name);
 510         decklink_get_attr_string(dl, BMDDeckLinkDeviceHandle, &unique_name);
 511         if (display_name && !strcmp(name, display_name) || unique_name && !strcmp(name, unique_name)) {
 512             av_free((void *)unique_name);
 513             av_free((void *)display_name);
 514             ctx->dl = dl;
 515             break;
 516         }
 517         av_free((void *)display_name);
 518         av_free((void *)unique_name);
 519         dl->Release();
 520     }
 521     iter->Release();
 522     if (!ctx->dl)
 523         return AVERROR(ENXIO);
 524
 525     if (ctx->dl->QueryInterface(IID_IDeckLinkConfiguration, (void **)&ctx->cfg) != S_OK) {
 526         av_log(avctx, AV_LOG_ERROR, "Could not get configuration interface for '%s'\n", name);
 527         ff_decklink_cleanup(avctx);
 528         return AVERROR_EXTERNAL;
 529     }
 530
 531     if (ctx->dl->QueryInterface(IID_IDeckLinkProfileAttributes, (void **)&ctx->attr) != S_OK) {
 532         av_log(avctx, AV_LOG_ERROR, "Could not get attributes interface for '%s'\n", name);
 533         ff_decklink_cleanup(avctx);
 534         return AVERROR_EXTERNAL;
 535     }
 536
 537     return 0;
 538 }