Function ff_decklink_write_header

libavdevice/decklink_enc.cpp:870–966

extern "C" {

av_cold int ff_decklink_write_header(AVFormatContext *avctx)
{
    struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
    struct decklink_ctx *ctx;
    unsigned int n;
    int ret;

    ctx = (struct decklink_ctx *) av_mallocz(sizeof(struct decklink_ctx));
    if (!ctx)
        return AVERROR(ENOMEM);
    ctx->list_devices = cctx->list_devices;
    ctx->list_formats = cctx->list_formats;
    ctx->preroll      = cctx->preroll;
    ctx->duplex_mode  = cctx->duplex_mode;
    ctx->first_pts    = AV_NOPTS_VALUE;
    if (cctx->link > 0 && (unsigned int)cctx->link < FF_ARRAY_ELEMS(decklink_link_conf_map))
        ctx->link = decklink_link_conf_map[cctx->link];
    cctx->ctx = ctx;
#if CONFIG_LIBKLVANC
    if (klvanc_context_create(&ctx->vanc_ctx) < 0) {
        av_log(avctx, AV_LOG_ERROR, "Cannot create VANC library context\n");
        return AVERROR(ENOMEM);
    }
    ctx->supports_vanc = 1;
#endif

    /* List available devices and exit. */
    if (ctx->list_devices) {
        ff_decklink_list_devices_legacy(avctx, 0, 1);
        return AVERROR_EXIT;
    }

    ret = ff_decklink_init_device(avctx, avctx->url);
    if (ret < 0)
        return ret;

    /* Get output device. */
    if (ctx->dl->QueryInterface(IID_IDeckLinkOutput_v14_2_1, (void **) &ctx->dlo) != S_OK) {
        av_log(avctx, AV_LOG_ERROR, "Could not open output device from '%s'\n",
               avctx->url);
        ret = AVERROR(EIO);
        goto error;
    }

    /* List supported formats. */
    if (ctx->list_formats) {
        ff_decklink_list_formats(avctx);
        ret = AVERROR_EXIT;
        goto error;
    }

    /* Setup streams. */
    ret = AVERROR(EIO);
    for (n = 0; n < avctx->nb_streams; n++) {
        AVStream *st = avctx->streams[n];
        AVCodecParameters *c = st->codecpar;
        if        (c->codec_type == AVMEDIA_TYPE_AUDIO) {
            if (decklink_setup_audio(avctx, st))