Function decklink_setup_video

libavdevice/decklink_enc.cpp:197–266

};

static int decklink_setup_video(AVFormatContext *avctx, AVStream *st)
{
    struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
    struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;
    AVCodecParameters *c = st->codecpar;

    if (ctx->video) {
        av_log(avctx, AV_LOG_ERROR, "Only one video stream is supported!\n");
        return -1;
    }

    if (c->codec_id == AV_CODEC_ID_WRAPPED_AVFRAME) {
        if (c->format != AV_PIX_FMT_UYVY422) {
            av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format!"
                   " Only AV_PIX_FMT_UYVY422 is supported.\n");
            return -1;
        }
        ctx->raw_format = bmdFormat8BitYUV;
    } else if (c->codec_id != AV_CODEC_ID_V210) {
        av_log(avctx, AV_LOG_ERROR, "Unsupported codec type!"
               " Only V210 and wrapped frame with AV_PIX_FMT_UYVY422 are supported.\n");
        return -1;
    } else {
        ctx->raw_format = bmdFormat10BitYUV;
    }

    if (ff_decklink_set_configs(avctx, DIRECTION_OUT) < 0) {
        av_log(avctx, AV_LOG_ERROR, "Could not set output configuration\n");
        return -1;
    }
    if (ff_decklink_set_format(avctx, c->width, c->height,
                            st->time_base.num, st->time_base.den, c->field_order)) {
        av_log(avctx, AV_LOG_ERROR, "Unsupported video size, framerate or field order!"
               " Check available formats with -list_formats 1.\n");
        return -1;
    }
    if (ctx->supports_vanc && ctx->dlo->EnableVideoOutput(ctx->bmd_mode, bmdVideoOutputVANC) != S_OK) {
        av_log(avctx, AV_LOG_WARNING, "Could not enable video output with VANC! Trying without...\n");
        ctx->supports_vanc = 0;
    }
    if (!ctx->supports_vanc && ctx->dlo->EnableVideoOutput(ctx->bmd_mode, bmdVideoOutputFlagDefault) != S_OK) {
        av_log(avctx, AV_LOG_ERROR, "Could not enable video output!\n");
        return -1;
    }

    /* Set callback. */
    ctx->output_callback = new decklink_output_callback();
    ctx->dlo->SetScheduledFrameCompletionCallback(ctx->output_callback);

    ctx->frames_preroll = st->time_base.den * ctx->preroll;
    if (st->time_base.den > 1000)
        ctx->frames_preroll /= 1000;

    /* Buffer twice as many frames as the preroll. */
    ctx->frames_buffer = ctx->frames_preroll * 2;
    ctx->frames_buffer = FFMIN(ctx->frames_buffer, 60);
    pthread_mutex_init(&ctx->mutex, NULL);
    pthread_cond_init(&ctx->cond, NULL);