decklink_dec.cpp

    switch (ctx->bmd_field_dominance) {
    case bmdUpperFieldFirst:
        st->codecpar->field_order = AV_FIELD_TT;
        break;
    case bmdLowerFieldFirst:
        st->codecpar->field_order = AV_FIELD_BB;
        break;
    case bmdProgressiveFrame:
    case bmdProgressiveSegmentedFrame:
        st->codecpar->field_order = AV_FIELD_PROGRESSIVE;
        break;
    }

    avpriv_set_pts_info(st, 64, 1, 1000000);  /* 64 bits pts in us */

    ctx->video_st=st;

    if (ctx->teletext_lines) {
        st = avformat_new_stream(avctx, NULL);
        if (!st) {
            av_log(avctx, AV_LOG_ERROR, "Cannot add stream\n");
            ret = AVERROR(ENOMEM);
            goto error;
        }
        st->codecpar->codec_type  = AVMEDIA_TYPE_SUBTITLE;
        st->time_base.den         = ctx->bmd_tb_den;
        st->time_base.num         = ctx->bmd_tb_num;
        st->codecpar->codec_id    = AV_CODEC_ID_DVB_TELETEXT;
        avpriv_set_pts_info(st, 64, 1, 1000000);  /* 64 bits pts in us */
        ctx->teletext_st = st;
    }

    av_log(avctx, AV_LOG_VERBOSE, "Using %d input audio channels\n", ctx->audio_st->codecpar->channels);
    result = ctx->dli->EnableAudioInput(bmdAudioSampleRate48kHz, cctx->audio_depth == 32 ? bmdAudioSampleType32bitInteger : bmdAudioSampleType16bitInteger, ctx->audio_st->codecpar->channels);

    if (result != S_OK) {
        av_log(avctx, AV_LOG_ERROR, "Cannot enable audio input\n");
        ret = AVERROR(EIO);
        goto error;
    }

    result = ctx->dli->EnableVideoInput(ctx->bmd_mode,
                                        (BMDPixelFormat) cctx->raw_format,
                                        bmdVideoInputFlagDefault);

    if (result != S_OK) {
        av_log(avctx, AV_LOG_ERROR, "Cannot enable video input\n");
        ret = AVERROR(EIO);
        goto error;
    }

    avpacket_queue_init (avctx, &ctx->queue);

    if (decklink_start_input (avctx) != S_OK) {
        av_log(avctx, AV_LOG_ERROR, "Cannot start input stream\n");
        ret = AVERROR(EIO);
        goto error;
    }

    return 0;

error:
    ff_decklink_cleanup(avctx);
    return ret;
}

int ff_decklink_read_packet(AVFormatContext *avctx, AVPacket *pkt)
{
    struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
    struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;

    avpacket_queue_get(&ctx->queue, pkt, 1);

    return 0;
}

int ff_decklink_list_input_devices(AVFormatContext *avctx, struct AVDeviceInfoList *device_list)
{
    return ff_decklink_list_devices(avctx, device_list, 1, 0);
}

} /* extern "C" */