Function decklink_create_iterator

libavdevice/decklink_common.cpp:61–104

#include "decklink_common.h"

static IDeckLinkIterator *decklink_create_iterator(AVFormatContext *avctx)
{
    IDeckLinkIterator *iter;

#ifdef _WIN32
    if (CoInitialize(NULL) < 0) {
        av_log(avctx, AV_LOG_ERROR, "COM initialization failed.\n");
        return NULL;
    }

    if (CoCreateInstance(CLSID_CDeckLinkIterator, NULL, CLSCTX_ALL,
                         IID_IDeckLinkIterator, (void**) &iter) != S_OK) {
        iter = NULL;
    }
#else
    iter = CreateDeckLinkIteratorInstance();
#endif
    if (!iter) {
        av_log(avctx, AV_LOG_ERROR, "Could not create DeckLink iterator. "
                                    "Make sure you have DeckLink drivers " BLACKMAGIC_DECKLINK_API_VERSION_STRING " or newer installed.\n");
    } else {
        IDeckLinkAPIInformation *api;
        int64_t version;
#ifdef _WIN32
        if (CoCreateInstance(CLSID_CDeckLinkAPIInformation, NULL, CLSCTX_ALL,
                             IID_IDeckLinkAPIInformation, (void**) &api) != S_OK) {
            api = NULL;
        }
#else
        api = CreateDeckLinkAPIInformationInstance();
#endif
        if (api && api->GetInt(BMDDeckLinkAPIVersion, &version) == S_OK) {
            if (version < BLACKMAGIC_DECKLINK_API_VERSION)
                av_log(avctx, AV_LOG_WARNING, "Installed DeckLink drivers are too old and may be incompatible with the SDK this module was built against. "
                                              "Make sure you have DeckLink drivers " BLACKMAGIC_DECKLINK_API_VERSION_STRING " or newer installed.\n");
        } else {
            av_log(avctx, AV_LOG_ERROR, "Failed to check installed DeckLink API version.\n");
        }
        if (api)
            api->Release();
    }

    return iter;
}

static int decklink_get_attr_string(IDeckLink *dl, BMDDeckLinkAttributeID cfg_id, const char **s)
{