linux下webcam进行录像， gstreamer架构

最新推荐文章于 2023-08-24 16:29:52 发布

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最新推荐文章于 2023-08-24 16:29:52 发布 · 1.3k 阅读

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CC 4.0 BY-SA版权

文章标签：

#linux #cam #video #null #audio #object

本文档展示了如何在Linux环境下使用Gstreamer框架进行摄像头录像。通过Gstreamer的不同组件，如v4l2src、ffmpegcolorspace、theoraenc和filesink，创建了一个从摄像头捕获视频，进行颜色空间转换，编码并保存到文件的管道。代码中包含了错误处理、视频帧率设置和文件输出位置的配置。

author: CarlsonLee(carlsonlee.freec@hotmail.com), 本代码是freecamera的一部分，freecamera源代码存在：http://gitorious.org/freecamera

#include <glib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <pthread.h>
#include <gst/gst.h>
#include <gst/app/gstappsink.h>
#include <gst/app/gstappsrc.h>
#include <gst/app/gstappbuffer.h>

#include "cam_midware.h"
#include "cam_global.h"
#include "cam_display.h"
#include "cam_files.h"
#include "color_space.h"
#include "review_data.h"
#include "cam_ui.h"
#include "cam_utils.h"
#include "cam_err.h"

#define SKIP_FRAMES 10
static struct tag_CAM_MW_DATA
{
    gint             camera_status;
   GMainLoop*     video_cap_loop;
   char*           filename;
   gint            skip_frames;
   GMutex*           mutex;
}cam_video_data;

static gboolean video_bus_call (GstBus     *bus,
                       GstMessage *msg,
                       gpointer    data)
{
    GMainLoop *loop = (GMainLoop *) data;

    bus = bus;
    switch (GST_MESSAGE_TYPE (msg))
    {
    case GST_MESSAGE_EOS:
        g_main_loop_quit (loop);
        break;
    case GST_MESSAGE_ERROR:
        {
            gchar *debug;
            GError *error;
            gst_message_parse_error (msg, &error, &debug);
            g_print ("Error**##: %s, %s/n", error->message, debug);
            g_free (debug);
            g_error_free (error);
            g_main_loop_quit (loop);
        }
        break;
    default:
        break;
    }
    return TRUE;
}

static gboolean link_video_cap_src(GstElement *src, GstElement *sink)
{
    gboolean link_ok = FALSE;
    GstCaps *caps;
   guint width = cam_global_data.cam_res.video_res[cam_global_data.cam_res.video_res_cur].width;
   guint height = cam_global_data.cam_res.video_res[cam_global_data.cam_res.video_res_cur].height;
   caps = gst_caps_new_simple ("video/x-raw-yuv",
            "width", G_TYPE_INT, width,
            "height", G_TYPE_INT, height, NULL);
    link_ok = gst_element_link_filtered (src, sink, caps);
    gst_caps_unref (caps);
    return link_ok;
}

static gboolean link_video_cap_pp(GstElement *src, GstElement *sink)
{
    gboolean link_ok = FALSE;
    GstCaps *caps;

   guint width = cam_global_data.cam_res.video_res[cam_global_data.cam_res.video_res_cur].width;
   guint height = cam_global_data.cam_res.video_res[cam_global_data.cam_r