添加VLC录像API

最近使用VLC播放RTSP数据想在本地截图录像，但libvlc中并不包含录像api，网上找到一些资料，自己添加这个接口并测试成功。接口主要是按照官方网站来做的（https://patches.videolan.org/patch/606/）。我是用的源码是最新的，编译过程中很顺利，前提是安装好各种依赖包。测试代码如下：

#include <vlc/vlc.h>
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <unistd.h>

static const char * test_defaults_args[] = {
    "-v",
    "--ignore-config",
    "-I",
    "dummy",
    "--no-media-library"
};

static const int test_defaults_nargs =
    sizeof (test_defaults_args) / sizeof (test_defaults_args[0]);

int main (void)
{

    libvlc_instance_t *instance;
    libvlc_media_t *media;
    libvlc_media_player_t *player;
    const char * file = "rtsp://192.168.1.68";

    //instance = libvlc_new (test_defaults_nargs, test_defaults_args);
    instance = libvlc_new (0, NULL);
    assert (instance != NULL);

    //打开文件
    //media = libvlc_media_new_path (instance, file);
    //打开串流
    media = libvlc_media_new_location (instance, file);
    assert (media != NULL);

    player = libvlc_media_player_new_from_media (media);
    assert (player != NULL);

    libvlc_media_release (media);

    libvlc_media_player_play (player);
    printf("play
");
    libvlc_media_player_record_start(player, "testfile");
    printf("record
");

    sleep(10*10);

    libvlc_video_take_snapshot(player,0,"test.jpg",0,0);

    printf("%d
", libvlc_media_player_get_state(player));
    printf("stop record
");
    libvlc_media_player_record_stop(player);
    printf("stop play
");
    //libvlc_media_player_stop (player);
    printf("player release
");
    libvlc_media_player_release (player);
    printf("release
");
    libvlc_release (instance);
    return 0;
}

很惊讶选项里面竟然没有C...。

编译：gcc test.c -o test -lvlc

运行之后截图录像均正常。这里libvlc_media_player_stop()注销是因为有些情况下这个函数会造成死锁，这个涉及到线程安全的一些问题，以后再研究。