#!/usr/bin/env bash
# 低延迟播放：从 UDP/RTP 直推端口拉流并显示（Linux 接收端）。
# 用法: ./play-udp.sh <端口> [h265|h264]   默认 h265
set -e
PORT="${1:?用法: ./play-udp.sh <端口> [h265|h264]}"
CODEC="${2:-h265}"
if [ "$CODEC" = "h264" ]; then
    CAPS="application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264"
    DEPAY=rtph264depay; DEC=avdec_h264
else
    CAPS="application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H265"
    DEPAY=rtph265depay; DEC=avdec_h265
fi
echo "== 低延迟播放 UDP:$PORT ($CODEC)  Ctrl-C 退出 =="
exec gst-launch-1.0 udpsrc port="$PORT" caps="$CAPS" \
    ! "$DEPAY" ! "$DEC" \
    ! fpsdisplaysink video-sink=autovideosink text-overlay=false sync=false