C++ IDeckLinkDisplayMode::GetFieldDominance方法代码示例

    BMDDisplayMode getDisplayMode( mlt_profile profile, int vancLines )
    {
        IDeckLinkDisplayModeIterator* iter = NULL;
        IDeckLinkDisplayMode* mode = NULL;
        BMDDisplayMode result = (BMDDisplayMode) bmdDisplayModeNotSupported;

        if ( m_decklinkInput->GetDisplayModeIterator( &iter ) == S_OK )
        {
            while ( !result && iter->Next( &mode ) == S_OK )
            {
                int width = mode->GetWidth();
                int height = mode->GetHeight();
                BMDTimeValue duration;
                BMDTimeScale timescale;
                mode->GetFrameRate( &duration, &timescale );
                double fps = (double) timescale / duration;
                int p = mode->GetFieldDominance() == bmdProgressiveFrame;
                m_topFieldFirst = mode->GetFieldDominance() == bmdUpperFieldFirst;
                m_colorspace = ( mode->GetFlags() & bmdDisplayModeColorspaceRec709 ) ? 709 : 601;
                mlt_log_verbose( getProducer(), "BMD mode %dx%d %.3f fps prog %d tff %d\n", width, height, fps, p, m_topFieldFirst );

                if ( width == profile->width && p == profile->progressive
                        && ( height + vancLines == profile->height || ( height == 486 && profile->height == 480 + vancLines ) )
                        && fps == mlt_profile_fps( profile ) )
                    result = mode->GetDisplayMode();
                SAFE_RELEASE( mode );
            }
            SAFE_RELEASE( iter );
        }

        return result;
    }

	IDeckLinkDisplayMode* getDisplayMode()
	{
		mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( getConsumer() ) );
		IDeckLinkDisplayModeIterator* iter = NULL;
		IDeckLinkDisplayMode* mode = NULL;
		IDeckLinkDisplayMode* result = 0;

		if ( m_deckLinkOutput->GetDisplayModeIterator( &iter ) == S_OK )
		{
			while ( !result && iter->Next( &mode ) == S_OK )
			{
				m_width = mode->GetWidth();
				m_height = mode->GetHeight();
				mode->GetFrameRate( &m_duration, &m_timescale );
				m_fps = (double) m_timescale / m_duration;
				int p = mode->GetFieldDominance() == bmdProgressiveFrame;
				mlt_log_verbose( getConsumer(), "BMD mode %dx%d %.3f fps prog %d\n", m_width, m_height, m_fps, p );

				if ( m_width == profile->width && p == profile->progressive
					 && (int) m_fps == (int) mlt_profile_fps( profile )
					 && ( m_height == profile->height || ( m_height == 486 && profile->height == 480 ) ) )
					result = mode;
				else
					SAFE_RELEASE( mode );
			}
			SAFE_RELEASE( iter );
		}

		return result;
	}

/* lookup the field dominance corresponding to this BMDDisplayMode */
static RawFrame::FieldDominance find_dominance(BMDDisplayMode mode, 
        IDeckLinkDisplayModeIterator *iterator) {
    IDeckLinkDisplayMode *imode;

    if (iterator->Next(&imode) != S_OK) {
        throw std::runtime_error("DeckLink: failed to iterate display modes");
    }

    while (imode) {
        BMDFieldDominance fd = imode->GetFieldDominance( );
        BMDDisplayMode thismode = imode->GetDisplayMode( );
        imode->Release( );

        if (thismode == mode) {
            switch (fd) {
                case bmdLowerFieldFirst:
                    return RawFrame::BOTTOM_FIELD_FIRST;
                case bmdUpperFieldFirst:
                    return RawFrame::TOP_FIELD_FIRST;
                case bmdProgressiveFrame:
                case bmdProgressiveSegmentedFrame:
                    return RawFrame::PROGRESSIVE;
                default:
                    return RawFrame::UNKNOWN;
            }
        }

        if (iterator->Next(&imode) != S_OK) {
            throw std::runtime_error("failed to iterate display modes");
        }
    }

    /* no modes matched so we don't know dominance */
    return RawFrame::UNKNOWN; 
}

int ff_decklink_list_formats(AVFormatContext *avctx, decklink_direction_t direction)
{
    struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
    struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;
    IDeckLinkDisplayModeIterator *itermode;
    IDeckLinkDisplayMode *mode;
    uint32_t format_code;
    HRESULT res;

    if (direction == DIRECTION_IN) {
        int ret;
        ret = decklink_select_input(avctx, bmdDeckLinkConfigAudioInputConnection);
        if (ret < 0)
            return ret;
        ret = decklink_select_input(avctx, bmdDeckLinkConfigVideoInputConnection);
        if (ret < 0)
            return ret;
        res = ctx->dli->GetDisplayModeIterator (&itermode);
    } else {
        res = ctx->dlo->GetDisplayModeIterator (&itermode);
    }

    if (res!= S_OK) {
            av_log(avctx, AV_LOG_ERROR, "Could not get Display Mode Iterator\n");
            return AVERROR(EIO);
    }

    av_log(avctx, AV_LOG_INFO, "Supported formats for '%s':\n\tformat_code\tdescription",
               avctx->filename);
    while (itermode->Next(&mode) == S_OK) {
        BMDTimeValue tb_num, tb_den;
        mode->GetFrameRate(&tb_num, &tb_den);
        format_code = av_bswap32(mode->GetDisplayMode());
        av_log(avctx, AV_LOG_INFO, "\n\t%.4s\t\t%ldx%ld at %d/%d fps",
                (char*) &format_code, mode->GetWidth(), mode->GetHeight(),
                (int) tb_den, (int) tb_num);
        switch (mode->GetFieldDominance()) {
        case bmdLowerFieldFirst:
        av_log(avctx, AV_LOG_INFO, " (interlaced, lower field first)"); break;
        case bmdUpperFieldFirst:
        av_log(avctx, AV_LOG_INFO, " (interlaced, upper field first)"); break;
        }
        mode->Release();
    }
    av_log(avctx, AV_LOG_INFO, "\n");

    itermode->Release();

    return 0;
}

int ff_decklink_list_formats(AVFormatContext *avctx, decklink_direction_t direction)
{
    struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;
    struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;
    IDeckLinkDisplayModeIterator *itermode;
    IDeckLinkDisplayMode *mode;
    int i=0;
    HRESULT res;

    if (direction == DIRECTION_IN) {
        res = ctx->dli->GetDisplayModeIterator (&itermode);
    } else {
        res = ctx->dlo->GetDisplayModeIterator (&itermode);
    }

    if (res!= S_OK) {
            av_log(avctx, AV_LOG_ERROR, "Could not get Display Mode Iterator\n");
            return AVERROR(EIO);
    }

    av_log(avctx, AV_LOG_INFO, "Supported formats for '%s':\n",
               avctx->filename);
    while (itermode->Next(&mode) == S_OK) {
        BMDTimeValue tb_num, tb_den;
        mode->GetFrameRate(&tb_num, &tb_den);
        av_log(avctx, AV_LOG_INFO, "\t%d\t%ldx%ld at %d/%d fps",
                ++i,mode->GetWidth(), mode->GetHeight(),
                (int) tb_den, (int) tb_num);
        switch (mode->GetFieldDominance()) {
        case bmdLowerFieldFirst:
        av_log(avctx, AV_LOG_INFO, " (interlaced, lower field first)"); break;
        case bmdUpperFieldFirst:
        av_log(avctx, AV_LOG_INFO, " (interlaced, upper field first)"); break;
        }
        av_log(avctx, AV_LOG_INFO, "\n");
        mode->Release();
    }

    itermode->Release();

    return 0;
}

int ff_decklink_set_format(AVFormatContext *avctx,
                               int width, int height,
                               int tb_num, int tb_den,
                               decklink_direction_t direction, int num)
{
    struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;
    struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;
    BMDDisplayModeSupport support;
    IDeckLinkDisplayModeIterator *itermode;
    IDeckLinkDisplayMode *mode;
    int i = 1;
    HRESULT res;

    if (direction == DIRECTION_IN) {
        res = ctx->dli->GetDisplayModeIterator (&itermode);
    } else {
        res = ctx->dlo->GetDisplayModeIterator (&itermode);
    }

    if (res!= S_OK) {
            av_log(avctx, AV_LOG_ERROR, "Could not get Display Mode Iterator\n");
            return AVERROR(EIO);
    }


    if (tb_num == 1) {
        tb_num *= 1000;
        tb_den *= 1000;
    }
    ctx->bmd_mode = bmdModeUnknown;
    while ((ctx->bmd_mode == bmdModeUnknown) && itermode->Next(&mode) == S_OK) {
        BMDTimeValue bmd_tb_num, bmd_tb_den;
        int bmd_width  = mode->GetWidth();
        int bmd_height = mode->GetHeight();

        mode->GetFrameRate(&bmd_tb_num, &bmd_tb_den);

        if ((bmd_width == width && bmd_height == height &&
            bmd_tb_num == tb_num && bmd_tb_den == tb_den) || i == num) {
            ctx->bmd_mode   = mode->GetDisplayMode();
            ctx->bmd_width  = bmd_width;
            ctx->bmd_height = bmd_height;
            ctx->bmd_tb_den = bmd_tb_den;
            ctx->bmd_tb_num = bmd_tb_num;
            ctx->bmd_field_dominance = mode->GetFieldDominance();
            av_log(avctx, AV_LOG_INFO, "Found Decklink mode %d x %d with rate %.2f%s\n",
                bmd_width, bmd_height, (float)bmd_tb_den/(float)bmd_tb_num,
                (ctx->bmd_field_dominance==bmdLowerFieldFirst || ctx->bmd_field_dominance==bmdUpperFieldFirst)?"(i)":"");
        }

        mode->Release();
        i++;
    }

    itermode->Release();

    if (ctx->bmd_mode == bmdModeUnknown)
        return -1;
    if (direction == DIRECTION_IN) {
        if (ctx->dli->DoesSupportVideoMode(ctx->bmd_mode, bmdFormat8BitYUV,
                                           bmdVideoOutputFlagDefault,
                                           &support, NULL) != S_OK)
            return -1;
    } else {
        if (ctx->dlo->DoesSupportVideoMode(ctx->bmd_mode, bmdFormat8BitYUV,
                                           bmdVideoOutputFlagDefault,
                                           &support, NULL) != S_OK)
        return -1;
    }
    if (support == bmdDisplayModeSupported)
        return 0;

    return -1;
}

	HRESULT render( mlt_frame frame )
	{
		HRESULT result = S_OK;
		// Get the audio		
		double speed = mlt_properties_get_double( MLT_FRAME_PROPERTIES(frame), "_speed" );
		if ( speed == 1.0 )
		{
			mlt_audio_format format = mlt_audio_s16;
			int frequency = bmdAudioSampleRate48kHz;
			int samples = mlt_sample_calculator( m_fps, frequency, m_count );
			int16_t *pcm = 0;
			
			if ( !mlt_frame_get_audio( frame, (void**) &pcm, &format, &frequency, &m_channels, &samples ) )
			{
				int count = samples;
				
				if ( !m_isPrerolling )
				{
					uint32_t audioCount = 0;
					uint32_t videoCount = 0;
					
					// Check for resync
					m_deckLinkOutput->GetBufferedAudioSampleFrameCount( &audioCount );
					m_deckLinkOutput->GetBufferedVideoFrameCount( &videoCount );
					
					// Underflow typically occurs during non-normal speed playback.
					if ( audioCount < 1 || videoCount < 1 )
					{
						// Upon switching to normal playback, buffer some frames faster than realtime.
						mlt_log_info( &m_consumer, "buffer underrun: audio buf %u video buf %u frames\n", audioCount, videoCount );
						m_prerollCounter = 0;
					}
					
					// While rebuffering
					if ( isBuffering() )
					{
						// Only append audio to reach the ideal level and not overbuffer.
						int ideal = ( m_preroll - 1 ) * bmdAudioSampleRate48kHz / m_fps;
						int actual = m_fifo->used / m_channels + audioCount;
						int diff = ideal / 2 - actual;
						count = diff < 0 ? 0 : diff < count ? diff : count;
					}
				}
				if ( count > 0 )
					sample_fifo_append( m_fifo, pcm, count * m_channels );
			}
		}
		
		// Create video frames while pre-rolling
		if ( m_isPrerolling )
		{
			createFrame();
			if ( !m_videoFrame )
			{
				mlt_log_error( &m_consumer, "failed to create video frame\n" );
				return S_FALSE;
			}
		}
		
		// Get the video
		if ( mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "rendered") )
		{
			mlt_image_format format = mlt_image_yuv422;
			uint8_t* image = 0;
			uint8_t* buffer = 0;

			if ( !mlt_frame_get_image( frame, &image, &format, &m_width, &m_height, 0 ) )
			{
				m_videoFrame = (IDeckLinkMutableVideoFrame*) mlt_deque_pop_back( m_videoFrameQ );
				m_videoFrame->GetBytes( (void**) &buffer );
				if ( m_displayMode->GetFieldDominance() == bmdUpperFieldFirst )
					// convert lower field first to top field first
					swab( image, buffer + m_width * 2, m_width * ( m_height - 1 ) * 2 );
				else
					swab( image, buffer, m_width * m_height * 2 );
				m_deckLinkOutput->ScheduleVideoFrame( m_videoFrame, m_count * m_duration, m_duration, m_timescale );
				mlt_deque_push_front( m_videoFrameQ, m_videoFrame );
			}
		}
		else
		{
			mlt_log_verbose( &m_consumer, "dropped video frame\n" );
		}
		++m_count;

		// Check for end of pre-roll
		if ( ++m_prerollCounter > m_preroll && m_isPrerolling )
		{
			// Start audio and video output
			m_deckLinkOutput->EndAudioPreroll();
			m_deckLinkOutput->StartScheduledPlayback( 0, m_timescale, 1.0 );
			m_isPrerolling = false;
		}

		return result;
	}

int ff_decklink_set_format(AVFormatContext *avctx,
                               int width, int height,
                               int tb_num, int tb_den,
                               enum AVFieldOrder field_order,
                               decklink_direction_t direction, int num)
{
    struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
    struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;
    BMDDisplayModeSupport support;
    IDeckLinkDisplayModeIterator *itermode;
    IDeckLinkDisplayMode *mode;
    int i = 1;
    HRESULT res;

    av_log(avctx, AV_LOG_DEBUG, "Trying to find mode for frame size %dx%d, frame timing %d/%d, field order %d, direction %d, mode number %d, format code %s\n",
        width, height, tb_num, tb_den, field_order, direction, num, (cctx->format_code) ? cctx->format_code : "(unset)");

    if (ctx->duplex_mode) {
        DECKLINK_BOOL duplex_supported = false;

        if (ctx->attr->GetFlag(BMDDeckLinkSupportsDuplexModeConfiguration, &duplex_supported) != S_OK)
            duplex_supported = false;

        if (duplex_supported) {
            res = ctx->cfg->SetInt(bmdDeckLinkConfigDuplexMode, ctx->duplex_mode == 2 ? bmdDuplexModeFull : bmdDuplexModeHalf);
            if (res != S_OK)
                av_log(avctx, AV_LOG_WARNING, "Setting duplex mode failed.\n");
            else
                av_log(avctx, AV_LOG_VERBOSE, "Successfully set duplex mode to %s duplex.\n", ctx->duplex_mode == 2 ? "full" : "half");
        } else {
            av_log(avctx, AV_LOG_WARNING, "Unable to set duplex mode, because it is not supported.\n");
        }
    }

    if (direction == DIRECTION_IN) {
        int ret;
        ret = decklink_select_input(avctx, bmdDeckLinkConfigAudioInputConnection);
        if (ret < 0)
            return ret;
        ret = decklink_select_input(avctx, bmdDeckLinkConfigVideoInputConnection);
        if (ret < 0)
            return ret;
        res = ctx->dli->GetDisplayModeIterator (&itermode);
    } else {
        res = ctx->dlo->GetDisplayModeIterator (&itermode);
    }

    if (res!= S_OK) {
            av_log(avctx, AV_LOG_ERROR, "Could not get Display Mode Iterator\n");
            return AVERROR(EIO);
    }

    char format_buf[] = "    ";
    if (cctx->format_code)
        memcpy(format_buf, cctx->format_code, FFMIN(strlen(cctx->format_code), sizeof(format_buf)));
    BMDDisplayMode target_mode = (BMDDisplayMode)AV_RB32(format_buf);
    AVRational target_tb = av_make_q(tb_num, tb_den);
    ctx->bmd_mode = bmdModeUnknown;
    while ((ctx->bmd_mode == bmdModeUnknown) && itermode->Next(&mode) == S_OK) {
        BMDTimeValue bmd_tb_num, bmd_tb_den;
        int bmd_width  = mode->GetWidth();
        int bmd_height = mode->GetHeight();
        BMDDisplayMode bmd_mode = mode->GetDisplayMode();
        BMDFieldDominance bmd_field_dominance = mode->GetFieldDominance();

        mode->GetFrameRate(&bmd_tb_num, &bmd_tb_den);
        AVRational mode_tb = av_make_q(bmd_tb_num, bmd_tb_den);

        if ((bmd_width == width &&
             bmd_height == height &&
             !av_cmp_q(mode_tb, target_tb) &&
             field_order_eq(field_order, bmd_field_dominance))
             || i == num
             || target_mode == bmd_mode) {
            ctx->bmd_mode   = bmd_mode;
            ctx->bmd_width  = bmd_width;
            ctx->bmd_height = bmd_height;
            ctx->bmd_tb_den = bmd_tb_den;
            ctx->bmd_tb_num = bmd_tb_num;
            ctx->bmd_field_dominance = bmd_field_dominance;
            av_log(avctx, AV_LOG_INFO, "Found Decklink mode %d x %d with rate %.2f%s\n",
                bmd_width, bmd_height, 1/av_q2d(mode_tb),
                (ctx->bmd_field_dominance==bmdLowerFieldFirst || ctx->bmd_field_dominance==bmdUpperFieldFirst)?"(i)":"");
        }

        mode->Release();
        i++;
    }

    itermode->Release();

    if (ctx->bmd_mode == bmdModeUnknown)
        return -1;
    if (direction == DIRECTION_IN) {
        if (ctx->dli->DoesSupportVideoMode(ctx->bmd_mode, bmdFormat8BitYUV,
                                           bmdVideoOutputFlagDefault,
                                           &support, NULL) != S_OK)
            return -1;
    } else {
        if (ctx->dlo->DoesSupportVideoMode(ctx->bmd_mode, bmdFormat8BitYUV,
//.........这里部分代码省略.........

//.........这里部分代码省略.........
    mode = var_CreateGetNonEmptyString(demux, "decklink-mode");
    if (mode)
        sys->autodetect = false; // disable autodetection if mode was set

    if (sys->autodetect) {
        msg_Dbg(demux, "Card supports input format detection");
        flags |= bmdVideoInputEnableFormatDetection;
        /* Enable a random format, we will reconfigure on format detection */
        u.id = htonl(bmdModeHD1080p2997);
    } else {
        if (!mode || strlen(mode) < 3 || strlen(mode) > 4) {
            msg_Err(demux, "Invalid mode: \'%s\'", mode ? mode : "");
            free(mode);
            goto finish;
        }

        msg_Dbg(demux, "Looking for mode \'%s\'", mode);
        memcpy(u.str, mode, 4);
        if (u.str[3] == '\0')
            u.str[3] = ' '; /* 'pal'\0 -> 'pal ' */
        free(mode);
    }

    es_format_t video_fmt;
    video_fmt.video.i_width = 0;

    for (IDeckLinkDisplayMode *m;; m->Release()) {
        if ((mode_it->Next(&m) != S_OK) || !m)
            break;

        const char *mode_name;
        BMDTimeValue frame_duration, time_scale;
        uint32_t field_flags;
        const char *field = GetFieldDominance(m->GetFieldDominance(), &field_flags);
        BMDDisplayMode id = ntohl(m->GetDisplayMode());

        if (m->GetName(&mode_name) != S_OK)
            mode_name = "unknown";
        if (m->GetFrameRate(&frame_duration, &time_scale) != S_OK) {
            time_scale = 0;
            frame_duration = 1;
        }

        msg_Dbg(demux, "Found mode '%4.4s': %s (%dx%d, %.3f fps%s)",
                 (char*)&id, mode_name,
                 (int)m->GetWidth(), (int)m->GetHeight(),
                 double(time_scale) / frame_duration, field);

        if (u.id == id) {
            video_fmt = GetModeSettings(demux, m);
            msg_Dbg(demux, "Using that mode");
        }
    }

    mode_it->Release();

    if (video_fmt.video.i_width == 0) {
        msg_Err(demux, "Unknown video mode `%4.4s\' specified.", (char*)&u.id);
        goto finish;
    }

    if (sys->input->EnableVideoInput(htonl(u.id), fmt, flags) != S_OK) {
        msg_Err(demux, "Failed to enable video input");
        goto finish;
    }

int ff_decklink_set_format(AVFormatContext *avctx,
                               int width, int height,
                               int tb_num, int tb_den,
                               enum AVFieldOrder field_order,
                               decklink_direction_t direction, int num)
{
    struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
    struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;
    BMDDisplayModeSupport support;
    IDeckLinkDisplayModeIterator *itermode;
    IDeckLinkDisplayMode *mode;
    int i = 1;
    HRESULT res;

    av_log(avctx, AV_LOG_DEBUG, "Trying to find mode for frame size %dx%d, frame timing %d/%d, field order %d, direction %d, mode number %d, format code %s\n",
        width, height, tb_num, tb_den, field_order, direction, num, (cctx->format_code) ? cctx->format_code : "(unset)");

    if (direction == DIRECTION_IN) {
        res = ctx->dli->GetDisplayModeIterator (&itermode);
    } else {
        res = ctx->dlo->GetDisplayModeIterator (&itermode);
    }

    if (res!= S_OK) {
            av_log(avctx, AV_LOG_ERROR, "Could not get Display Mode Iterator\n");
            return AVERROR(EIO);
    }

    char format_buf[] = "    ";
    if (cctx->format_code)
        memcpy(format_buf, cctx->format_code, FFMIN(strlen(cctx->format_code), sizeof(format_buf)));
    BMDDisplayMode target_mode = (BMDDisplayMode)AV_RB32(format_buf);
    AVRational target_tb = av_make_q(tb_num, tb_den);
    ctx->bmd_mode = bmdModeUnknown;
    while ((ctx->bmd_mode == bmdModeUnknown) && itermode->Next(&mode) == S_OK) {
        BMDTimeValue bmd_tb_num, bmd_tb_den;
        int bmd_width  = mode->GetWidth();
        int bmd_height = mode->GetHeight();
        BMDDisplayMode bmd_mode = mode->GetDisplayMode();
        BMDFieldDominance bmd_field_dominance = mode->GetFieldDominance();

        mode->GetFrameRate(&bmd_tb_num, &bmd_tb_den);
        AVRational mode_tb = av_make_q(bmd_tb_num, bmd_tb_den);

        if ((bmd_width == width &&
             bmd_height == height &&
             !av_cmp_q(mode_tb, target_tb) &&
             field_order_eq(field_order, bmd_field_dominance))
             || i == num
             || target_mode == bmd_mode) {
            ctx->bmd_mode   = bmd_mode;
            ctx->bmd_width  = bmd_width;
            ctx->bmd_height = bmd_height;
            ctx->bmd_tb_den = bmd_tb_den;
            ctx->bmd_tb_num = bmd_tb_num;
            ctx->bmd_field_dominance = bmd_field_dominance;
            av_log(avctx, AV_LOG_INFO, "Found Decklink mode %d x %d with rate %.2f%s\n",
                bmd_width, bmd_height, 1/av_q2d(mode_tb),
                (ctx->bmd_field_dominance==bmdLowerFieldFirst || ctx->bmd_field_dominance==bmdUpperFieldFirst)?"(i)":"");
        }

        mode->Release();
        i++;
    }

    itermode->Release();

    if (ctx->bmd_mode == bmdModeUnknown)
        return -1;
    if (direction == DIRECTION_IN) {
        if (ctx->dli->DoesSupportVideoMode(ctx->bmd_mode, (BMDPixelFormat) cctx->raw_format,
                                           bmdVideoOutputFlagDefault,
                                           &support, NULL) != S_OK)
            return -1;
    } else {
        if (ctx->dlo->DoesSupportVideoMode(ctx->bmd_mode, bmdFormat8BitYUV,
                                           bmdVideoOutputFlagDefault,
                                           &support, NULL) != S_OK)
        return -1;
    }
    if (support == bmdDisplayModeSupported)
        return 0;

    return -1;
}