机顶盒 DLNA代码 Linux C

以下是一个使用Linux C语言实现的DLNA服务器示例代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <upnp/upnp.h>

#define MAX_NAME_LEN 256
#define MAX_DESC_LEN 512
#define MAX_ICON_LEN 1024

int main(int argc, char* argv[]) {
    int ret;
    char name[MAX_NAME_LEN] = "My DLNA Server";
    char desc[MAX_DESC_LEN] = "A simple DLNA server";
    char icon[MAX_ICON_LEN] = "http://192.168.1.100:1234/icon.png";
    char *udn = "uuid:01234567-89ab-cdef-0123-456789abcdef";
    int port = 1234;
    char media_dir[MAX_NAME_LEN] = "/media";

    ret = UpnpInit(NULL, 0);
    if (ret != UPNP_E_SUCCESS) {
        fprintf(stderr, "Error: UpnpInit failed: %d\n", ret);
        return -1;
    }

    UpnpDevice_Handle device_handle;
    ret = UpnpRegisterRootDevice(desc, &device_handle, NULL);
    if (ret != UPNP_E_SUCCESS) {
        fprintf(stderr, "Error: UpnpRegisterRootDevice failed: %d\n", ret);
        UpnpFinish();
        return -1;
    }

    char udn_str[MAX_NAME_LEN];
    snprintf(udn_str, MAX_NAME_LEN, "uuid:%s", udn);

    char *device_type = "urn:schemas-upnp-org:device:MediaServer:1";
    char *friendly_name = name;
    char *manufacturer = "MyCompany";
    char *manufacturer_url = "http://www.mycompany.com";
    char *model_name = "My DLNA Server";
    char *model_number = "1.0";
    char *model_url = "http://www.mycompany.com/mymodel";
    char *serial_number = "1234567890";
    char *presentation_url = "http://192.168.1.100:1234/";

    UpnpDevice_Handle device_handle;
    ret = UpnpRegisterRootDevice(desc, &device_handle, NULL);
    if (ret != UPNP_E_SUCCESS) {
        fprintf(stderr, "Error: UpnpRegisterRootDevice failed: %d\n", ret);
        UpnpFinish();
        return -1;
    }

    char *service_type = "urn:schemas-upnp-org:service:ContentDirectory:1";
    char *service_id = "urn:upnp-org:serviceId:ContentDirectory";
    char *service_desc = "Content Directory Service";
    char *service_control_url = "/ContentDirectory/control";
    char *service_event_url = "/ContentDirectory/event";
    char *service_scpd_url = "/ContentDirectory/scpd.xml";

    UpnpService_Handle service_handle;
    ret = UpnpAddService(device_handle, service_type, service_id, service_desc, 
                         service_control_url, service_event_url, service_scpd_url, 
                         &service_handle);
    if (ret != UPNP_E_SUCCESS) {
        fprintf(stderr, "Error: UpnpAddService failed: %d\n", ret);
        UpnpFinish();
        return -1;
    }

    UpnpSetServiceDefaultRespMsgTimeout(service_handle, 30);

    char *var_name = "SystemUpdateID";
    char *var_value = "0";
    UpnpAddStateVariable(service_handle, var_name, UPNP_STATE_VAR_TYPE_UI4, 
                         UPNP_STATE_VAR_FLAG_SEND_EVENTS, var_value);

    var_name = "ContainerUpdateIDs";
    var_value = "";
    UpnpAddStateVariable(service_handle, var_name, UPNP_STATE_VAR_TYPE_STRING, 
                         UPNP_STATE_VAR_FLAG_SEND_EVENTS, var_value);

    var_name = "SortCapabilities";
    var_value = "";
    UpnpAddStateVariable(service_handle, var_name, UPNP_STATE_VAR_TYPE_STRING, 
                         UPNP_STATE_VAR_FLAG_SEND_EVENTS, var_value);

    var_name = "SystemUpdateID";
    var_value = "0";
    UpnpAddStateVariable(service_handle, var_name, UPNP_STATE_VAR_TYPE_UI4, 
                         UPNP_STATE_VAR_FLAG_SEND_EVENTS, var_value);

    var_name = "ContainerUpdateIDs";
    var_value = "";
    UpnpAddStateVariable(service_handle, var_name, UPNP_STATE_VAR_TYPE_STRING, 
                         UPNP_STATE_VAR_FLAG_SEND_EVENTS, var_value);

    var_name = "SortCapabilities";
    var_value = "";
    UpnpAddStateVariable(service_handle, var_name, UPNP_STATE_VAR_TYPE_STRING, 
                         UPNP_STATE_VAR_FLAG_SEND_EVENTS, var_value);

    UpnpAddAction(service_handle, "Browse", NULL, NULL, NULL, NULL, NULL, NULL);
    UpnpAddAction(service_handle, "Search", NULL, NULL, NULL, NULL, NULL, NULL);
    UpnpAddAction(service_handle, "GetSortCapabilities", NULL, NULL, NULL, NULL, NULL, NULL);
    UpnpAddAction(service_handle, "GetSystemUpdateID", NULL, NULL, NULL, NULL, NULL, NULL);
    UpnpAddAction(service_handle, "GetSearchCapabilities", NULL, NULL, NULL, NULL, NULL, NULL);

    UpnpAddAction(service_handle, "CreateObject", NULL, NULL, NULL, NULL, NULL, NULL);
    UpnpAddAction(service_handle, "DestroyObject", NULL, NULL, NULL, NULL, NULL, NULL);
    UpnpAddAction(service_handle, "UpdateObject", NULL, NULL, NULL, NULL, NULL, NULL);
    UpnpAddAction(service_handle, "ImportResource", NULL, NULL, NULL, NULL, NULL, NULL);
    UpnpAddAction(service_handle, "ExportResource", NULL, NULL, NULL, NULL, NULL, NULL);
    UpnpAddAction(service_handle, "StopTransferResource", NULL, NULL, NULL, NULL, NULL, NULL);
    UpnpAddAction(service_handle, "GetTransferProgress", NULL, NULL, NULL, NULL, NULL, NULL);

    char *device_desc_template = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
        "<root xmlns=\"urn:schemas-upnp-org:device-1-0\">\n"
        "  <specVersion>\n"
        "    <major>1</major>\n"
        "    <minor>0</minor>\n"
        "  </specVersion>\n"
        "  <device>\n"
        "    <deviceType>%s</deviceType>\n"
        "    <friendlyName>%s</friendlyName>\n"
        "    <manufacturer>%s</manufacturer>\n"
        "    <manufacturerURL>%s</manufacturerURL>\n"
        "    <modelName>%s</modelName>\n"
        "    <modelNumber>%s</modelNumber>\n"
        "    <modelURL>%s</modelURL>\n"
        "    <UDN>%s</UDN>\n"
        "    <serialNumber>%s</serialNumber>\n"
        "    <presentationURL>%s</presentationURL>\n"
        "    <iconList>\n"
        "      <icon>\n"
        "        <mimetype>image/png</mimetype>\n"
        "        <width>120</width>\n"
        "        <height>120</height>\n"
        "        <depth>24</depth>\n"
        "        <url>%s</url>\n"
        "      </icon>\n"
        "    </iconList>\n"
        "    <serviceList>\n"
        "      <service>\n"
        "        <serviceType>%s</serviceType>\n"
        "        <serviceId>%s</serviceId>\n"
        "        <SCPDURL>%s</SCPDURL>\n"
        "        <controlURL>%s</controlURL>\n"
        "        <eventSubURL>%s</eventSubURL>\n"
        "      </service>\n"
        "    </serviceList>\n"
        "  </device>\n"
        "</root>\n";

    char device_desc[MAX_DESC_LEN];
    snprintf(device_desc, MAX_DESC_LEN, device_desc_template, device_type, friendly_name, 
             manufacturer, manufacturer_url, model_name, model_number, model_url, udn_str, 
             serial_number, presentation_url, icon, service_type, service_id, service_scpd_url, 
             service_control_url, service_event_url);

    ret = UpnpSetDeviceDescription(device_handle, device_desc);
    if (ret != UPNP_E_SUCCESS) {
        fprintf(stderr, "Error: UpnpSetDeviceDescription failed: %d\n", ret);
        UpnpFinish();
        return -1;
    }

    UpnpSetWebServerRootDir(media_dir);

    printf("DLNA server started on port %d\n", port);

    ret = UpnpStartWebServer(port, media_dir);
    if (ret != UPNP_E_SUCCESS) {
        fprintf(stderr, "Error: UpnpStartWebServer failed: %d\n", ret);
        UpnpFinish();
        return -1;
    }

    UpnpFinish();

    return 0;
}

这个示例代码使用了libupnp库来实现DLNA服务器的功能。在代码中定义了DLNA服务器的名称、描述、图标、UDN、端口号和媒体文件夹路径等参数。在UpnpInit()函数中初始化了libupnp库，在UpnpRegisterRootDevice()函数中注册了根设备，并返回设备句柄。然后在UpnpAddService()函数中添加了ContentDirectory服务，设置了服务的状态变量和动作。在UpnpSetDeviceDescription()函数中设置了设备描述文件。最后在UpnpStartWebServer()函数中启动了Web服务器，开始提供媒体文件的访问服务。