[参考译文] TDA4VM：是否能够在 TDA4VM 和 TDA4VE 上安装 gst-rtsp-server 库？

您好、Joy Yang、

gst-rtsp-server 库应已包含在 SDK 中。  下面是一种测试 RTSP 功能的简单方法： [常见问题解答] SK-AM69：如何使用 RTSP 源运行 GStreamer 流水线-处理器论坛-处理器- TI E2E 支持论坛

谢谢！

Fabiana

尊敬的 Fabiana：

我想使用 TDA4作为 GStreamer RTSP 服务器(而不是 RTSP 客户端)。

以下是启动 GStreamer RTSP 服务器的示例代码：

#include <gst/gst.h>
#include <gst/rtsp-server/rtsp-server.h>

#define SERVER_HOST "0.0.0.0"
#define SERVER_PORT "8554"
#define SERVER_MAX_CONNECTIONS 10
#define VIDEO_PATH "video.mp4"

// 當 VLC 切換播放狀態時，處理 timestamp 凍結與恢復
static void media_new_state(GstRTSPMedia *media, gint state, gpointer user_data) {
    GstElement *pipeline = gst_rtsp_media_get_element(media);

    if (state == GST_STATE_PAUSED) {
        g_print("Media paused. Freezing timestamp.\n");
        gst_element_set_start_time(pipeline, GST_CLOCK_TIME_NONE);
    } else if (state == GST_STATE_PLAYING) {
        g_print("Media playing. Resuming timestamp.\n");
        gst_element_set_base_time(pipeline, gst_element_get_base_time(pipeline));
    }
}

// 當媒體初始化時，設定 clock 和 pipeline
static void media_configure(GstRTSPMediaFactory *factory, GstRTSPMedia *media, gpointer user_data) {
    GstElement *pipeline = gst_rtsp_media_get_element(media);
    GstClock *clock = gst_element_get_clock(pipeline);

    if (clock) {
        GstClockTime base_time = gst_clock_get_time(clock);
        g_print("Media configured. Pipeline clock time: %lu\n", base_time);

        // 確保 pipeline 使用相同 clock，避免 VLC 重新計算 timestamp
        gst_rtsp_media_set_clock(media, clock);
    }

    // 監聽媒體狀態變更 (播放、暫停、停止)
    g_signal_connect(media, "new-state", G_CALLBACK(media_new_state), NULL);
}

int main(int argc, char *argv[]) {
    GMainLoop *loop;
    GstRTSPServer *server;
    GstRTSPMountPoints *mounts;
    GstRTSPMediaFactory *factory;

    gst_init(&argc, &argv);
    loop = g_main_loop_new(NULL, FALSE);

    // 建立 RTSP 伺服器
    server = gst_rtsp_server_new();
    gst_rtsp_server_set_address(server, SERVER_HOST);  // 讓 RTSP 伺服器監聽所有網路介面
    gst_rtsp_server_set_service(server, SERVER_PORT);  // 設定 Port
    gst_rtsp_server_set_backlog(server, SERVER_MAX_CONNECTIONS);  // 設定最大連線數

    // 設定 mount point
    mounts = gst_rtsp_server_get_mount_points(server);
    factory = gst_rtsp_media_factory_new();

    // 設定 GStreamer pipeline
    gst_rtsp_media_factory_set_launch(factory,
        "( filesrc location=" VIDEO_PATH " ! decodebin ! videoconvert ! "
        "x264enc tune=zerolatency bitrate=2000 key-int-max=10 speed-preset=superfast ! "
        "rtph264pay name=pay0 pt=96 )");

    // 設定媒體配置回呼
    g_signal_connect(factory, "media-configure", G_CALLBACK(media_configure), NULL);

    // 掛載 stream
    gst_rtsp_mount_points_add_factory(mounts, "/stream", factory);
    g_object_unref(mounts);

    // 啟動 RTSP 伺服器
    if (gst_rtsp_server_attach(server, NULL) == 0) {
        g_printerr("Failed to attach the RTSP server\n");
        return -1;
    }

    g_print("RTSP server is running at rtsp://%s:%s/stream\n", SERVER_HOST, SERVER_PORT);
    g_main_loop_run(loop);

    return 0;
}

 它将通过以下方式构建：

gcc gst_rtsp_server.c -o gst_rtsp_server \
    -I/usr/include/gstreamer-1.0 \
    -I/usr/include/glib-2.0 \
    -I/usr/lib/glib-2.0/include \
    -L/usr/lib \
    -lgstreamer-1.0 \
    -lgstrtspserver-1.0

默认情况下、这2个库(libgstreamer-1.0和 libgstrtspserver-1.0)可在/usr/lib 上找到：

root@j721s2-evm:~/gst-rtsp-server# find /usr -name libgstreamer*
/usr/lib/libgstreamer-1.0.so.0.1603.0
/usr/lib/libgstreamer-1.0.so
/usr/lib/libgstreamer-1.0.so.0

root@j721s2-evm:~/gst-rtsp-server# find /usr -name libgstrtspserver*
/usr/lib/libgstrtspserver-1.0.so.0.1603.0
/usr/lib/libgstrtspserver-1.0.so.0

使用 opkg list-installed 命令可以找到这两个软件包：

gstreamer1.0 - 1.16.3-r0.0
gstreamer1.0-rtsp-server - 1.16.3-r0.0

但在基于 TDA4构建时发现错误：

gst_rtsp_server.c:2:10: fatal error: gst/rtsp-server/rtsp-server.h: No such file or directory
    2 | #include <gst/rtsp-server/rtsp-server.h>
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.

/usr/include/gstreamer-1.0/gst/gst.h (已找到)

/usr/include/gstreamer-1.0/gst/rtsp-server/rtsp-server.h (未找到)

为什么没有 gst/rtsp-server/目录？

谢谢！
乐在其中