PeerStreamer

                /*

                 * This case is for when the encoded fields are stored

                 * separately and we get a separate avpkt for each one. To keep

                 * the pipeline stable, we should return nothing and wait for

                 * the next time round to grab the second field.

                 * H.264 PAFF is an example of this.

                 */

                av_log(avctx, AV_LOG_VERBOSE, "Returning after first field.\n");

                avctx->has_b_frames--;

                /*

                 * This case is for when the encoded fields are stored in a

                 * single avpkt but the hardware returns then separately. Unless

                 * we grab the second field before returning, we'll slip another

                 * frame in the pipeline and if that happens a lot, we're sunk.

                 * So we have to get that second field now.

                 * Interlaced mpeg2 and vc1 are examples of this.

                 */

                av_log(avctx, AV_LOG_VERBOSE, "Trying to get second field.\n");

                while (1) {

                    usleep(priv->decode_wait);

                    ret = DtsGetDriverStatus(dev, &decoder_status);

                    if (ret == BC_STS_SUCCESS &&

                        decoder_status.ReadyListCount > 0) {

                        rec_ret = receive_frame(avctx, data, data_size, 1);

                        if ((rec_ret == RET_OK && *data_size > 0) ||

                            rec_ret == RET_ERROR)

                            break;

                    }

                av_log(avctx, AV_LOG_VERBOSE, "CrystalHD: Got second field.\n");