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国产操作系统对于确保信息安全、促进技术创新、满足特定需求以及推动经济发展等方面都具有重要意义,多以Linux为基础二次开发。2014年4月8日起,美国微软公司停止了对Windows XP SP3操作系统提供支持,这引起了社会和广大用户的广泛关注和对信息安全的担忧。
国产操作系统具有诸多好处:
信息安全与可控性提升:国产操作系统在设计和开发过程中,可以更加注重国内的信息安全标准和需求,通过自主研发,能够避免对外部系统的过度依赖,降低数据泄露和信息安全风险。此外,由于源代码掌握在自己手中,国家可以更好地控制操作系统的安全漏洞和后门问题,从而提高整个信息系统的安全可控性。
促进技术创新与产业发展:发展国产操作系统有助于推动国内软件技术的自主创新,提升整个软件产业的核心竞争力。通过自主研发,可以打破国外操作系统的技术垄断,掌握核心技术,为国内软件产业的发展提供有力支撑。同时,这也将促进相关产业链的发展,包括硬件、中间件、应用软件等,形成良性的产业生态。
满足特定需求与提升用户体验:国产操作系统可以根据国内用户的特定需求进行定制开发,提供更加符合国内使用习惯的服务和功能。这不仅可以提高用户的满意度和忠诚度,还可以为政府、企业等用户提供更加安全、高效、便捷的信息化解决方案。
培育新的经济增长点:随着数字经济的快速发展,操作系统作为数字基础设施的重要组成部分,具有巨大的市场潜力和商业价值。发展国产操作系统有助于培育新的经济增长点,推动国内软件产业的快速发展,为国家经济发展注入新的动力。
增强国家信息安全战略地位:在信息化时代,信息安全已成为国家安全的重要组成部分。发展国产操作系统有助于提升国家信息安全战略地位,增强国家在网络空间的话语权和影响力。
在发布国产操作系统|Linux平台的RTMP|RTSP直播播放SDK之前,大牛直播SDK(官方)在Windows、Android、iOS平台已经有了非常成熟的技术积累,功能齐全、稳定性高、超低延迟、超低资源占用,推进到Linux平台是顺理成章的。国产操作系统和Linux上的RTMP|RTSP直播播放模块,视频绘制使用XLib相关库实现, 音频输出使用PulseAudio和Alsa Lib,除了常规功能如实时静音、快照、buffer time设定、网络自动重连等,RTMP支持扩展H265播放, RTSP也支持H265播放。
Linux原生的RTSP、RTMP播放模块这里我们不做赘述,本文主要讲的是如何在Linux平台构建Unity下的RTSP和RTMP低延迟直播播放。
国产操作系统和Linux平台下,Unity环境的播放器,和Windows、Android、iOS平台基础流程并无大的差异,简单来说,通过调用原生的播放模块,回调解码后的YUV或RGB数据,投递到Unity侧,在Unity下完成绘制,这里就需要原生的RTMP、RTSP播放模块,拉流解码延迟非常低,数据投递效率非常高,无图无真相:
Linux平台,我们是回调的YUV的数据,也就是 NT_SP_E_VIDEO_FRAME_FROMAT_I420:
- /*定义视频帧图像格式*/
- public enum NT_SP_E_VIDEO_FRAME_FORMAT : uint
- {
- NT_SP_E_VIDEO_FRAME_FORMAT_RGB32 = 1, // 32位的rgb格式, r, g, b各占8, 另外一个字节保留, 内存字节格式为: bb gg rr xx, 主要是和windows位图匹配, 在小端模式下,按DWORD类型操作,最高位是xx, 依次是rr, gg, bb
- NT_SP_E_VIDEO_FRAME_FORMAT_ARGB = 2, // 32位的argb格式,内存字节格式是: bb gg rr aa 这种类型,和windows位图匹配
- NT_SP_E_VIDEO_FRAME_FROMAT_I420 = 3, // YUV420格式, 三个分量保存在三个面上
- }
开始播放之前,把回调设置下去:
- //video frame callback (YUV/RGB)
- videoctrl[sel].sdk_video_frame_call_back_ = new VideoControl.SetVideoFrameCallBack(SDKVideoFrameCallBack);
- videoctrl[sel].video_frame_call_back_ = new SP_SDKVideoFrameCallBack(NT_SP_SetVideoFrameCallBack);
- NTSmartPlayerSDK.NT_SP_SetVideoFrameCallBack(videoctrl[sel].player_handle_, (Int32)NT.NTSmartPlayerDefine.NT_SP_E_VIDEO_FRAME_FORMAT.NT_SP_E_VIDEO_FRAME_FROMAT_I420, window_handle_, videoctrl[sel].video_frame_call_back_);
-
- UInt32 flag = NTSmartPlayerSDK.NT_SP_StartPlay(videoctrl[sel].player_handle_);
视频帧结构:
- /*定义视频帧结构.*/
- [StructLayoutAttribute(LayoutKind.Sequential)]
- public struct NT_SP_VideoFrame
- {
- public Int32 format_; // 图像格式, 请参考NT_SP_E_VIDEO_FRAME_FORMAT
- public Int32 width_; // 图像宽
- public Int32 height_; // 图像高
-
- public Int64 timestamp_; // 时间戳, 一般是0,不使用, 以ms为单位的
-
- //具体的图像数据, argb和rgb32只用第一个, I420用前三个
- public IntPtr plane0_;
- public IntPtr plane1_;
- public IntPtr plane2_;
- public IntPtr plane3_;
-
- // 每一个平面的每一行的字节数,对于argb和rgb32,为了保持和windows位图兼容,必须是width_*4
- // 对于I420, stride0_ 是y的步长, stride1_ 是u的步长, stride2_ 是v的步长,
- public Int32 stride0_;
- public Int32 stride1_;
- public Int32 stride2_;
- public Int32 stride3_;
- }
开始播放:
- /*
- * SmartPlayerLinuxMono.cs
- * Author: daniusdk.com
- */
- public void StartPlayer(int sel)
- {
- Debug.Log("StartPlayer++, sel: " + sel);
-
- if (videoctrl[sel].is_playing_)
- {
- Debug.Log("StartPlayer, already started.. sel: " + sel);
- return;
- }
-
- lock (videoctrl[sel].frame_lock_)
- {
- videoctrl[sel].cur_video_frame_ = null;
- }
-
- if (!OpenPlayerHandle(sel))
- {
- Debug.LogError("call OpenPlayerHandle failed, sel:" + sel);
- return;
- }
-
- //video frame callback (YUV/RGB)
- videoctrl[sel].sdk_video_frame_call_back_ = new VideoControl.SetVideoFrameCallBack(SDKVideoFrameCallBack);
- videoctrl[sel].video_frame_call_back_ = new SP_SDKVideoFrameCallBack(NT_SP_SetVideoFrameCallBack);
- NTSmartPlayerSDK.NT_SP_SetVideoFrameCallBack(videoctrl[sel].player_handle_, (Int32)NT.NTSmartPlayerDefine.NT_SP_E_VIDEO_FRAME_FORMAT.NT_SP_E_VIDEO_FRAME_FROMAT_I420, window_handle_, videoctrl[sel].video_frame_call_back_);
-
- UInt32 flag = NTSmartPlayerSDK.NT_SP_StartPlay(videoctrl[sel].player_handle_);
-
- if (flag == DANIULIVE_RETURN_OK)
- {
- videoctrl[sel].is_need_get_frame_ = true;
- Debug.Log("NT_SP_StartPlay succeed, sel:" + sel);
- }
- else
- {
- NTSmartPlayerSDK.NT_SP_Close(videoctrl[sel].player_handle_);
- videoctrl[sel].player_handle_ = IntPtr.Zero;
-
- videoctrl[sel].is_need_get_frame_ = false;
- Debug.LogError("NT_SP_StartPlay failed, sel:" + sel);
- }
-
- videoctrl[sel].is_playing_ = true;
- }
其中,调用的OpenPlayerHandle()实现如下:
- /*
- * SmartPlayerLinuxMono.cs
- * Author: daniusdk.com
- */
- private bool OpenPlayerHandle(int sel)
- {
- if (videoctrl[sel].player_handle_ != IntPtr.Zero)
- return true;
-
- window_handle_ = IntPtr.Zero;
-
- videoctrl[sel].player_handle_ = new IntPtr();
- UInt32 ret_open = NTSmartPlayerSDK.NT_SP_Open(out videoctrl[sel].player_handle_, window_handle_, 0, IntPtr.Zero);
- if (ret_open != 0)
- {
- Debug.LogError("call NT_SP_Open failed, sel: " + sel);
- return false;
- }
-
- if (IntPtr.Zero == videoctrl[sel].player_handle_)
- return false;
-
- videoctrl[sel].event_call_back_ = new SP_SDKEventCallBack(NT_SP_SDKEventCallBack);
- NTSmartPlayerSDK.NT_SP_SetEventCallBack(videoctrl[sel].player_handle_, window_handle_, videoctrl[sel].event_call_back_);
- videoctrl[sel].sdk_event_call_back_ = new VideoControl.SetEventCallBack(SDKEventCallBack);
-
-
- /* ++ 播放前参数配置可加在此处 ++ */
-
- int play_buffer_time_ = 0;
- NTSmartPlayerSDK.NT_SP_SetBuffer(videoctrl[sel].player_handle_, play_buffer_time_); //设置buffer time
-
- //int is_using_tcp = 1; //TCP模式
- //NTSmartPlayerSDK.NT_SP_SetRTSPTcpMode(videoctrl[sel].player_handle_, is_using_tcp);
-
- int timeout = 10;
- NTSmartPlayerSDK.NT_SP_SetRtspTimeout(videoctrl[sel].player_handle_, timeout);
-
- int is_auto_switch_tcp_udp = 1;
- NTSmartPlayerSDK.NT_SP_SetRtspAutoSwitchTcpUdp(videoctrl[sel].player_handle_, is_auto_switch_tcp_udp);
-
- Boolean is_mute_ = false;
- NTSmartPlayerSDK.NT_SP_SetMute(videoctrl[sel].player_handle_, is_mute_ ? 1 : 0); //是否启动播放的时候静音
-
- int is_fast_startup = 1;
- NTSmartPlayerSDK.NT_SP_SetFastStartup(videoctrl[sel].player_handle_, is_fast_startup); //设置快速启动模式
-
- Boolean is_low_latency_ = false;
- NTSmartPlayerSDK.NT_SP_SetLowLatencyMode(videoctrl[sel].player_handle_, is_low_latency_ ? 1 : 0); //设置是否启用低延迟模式
-
- //设置旋转角度(设置0, 90, 180, 270度有效,其他值无效)
- int rotate_degrees = 0;
- NTSmartPlayerSDK.NT_SP_SetRotation(videoctrl[sel].player_handle_, rotate_degrees);
-
- int volume = 100;
- NTSmartPlayerSDK.NT_SP_SetAudioVolume(videoctrl[sel].player_handle_, volume); //设置播放音量, 范围是[0, 100], 0是静音,100是最大音量, 默认是100
-
- // 设置上传下载报速度
- int is_report = 0;
- int report_interval = 2;
- NTSmartPlayerSDK.NT_SP_SetReportDownloadSpeed(videoctrl[sel].player_handle_, is_report, report_interval);
-
- //设置播放URL
- NTSmartPlayerSDK.NT_SP_SetURL(videoctrl[sel].player_handle_, videoctrl[sel].playback_url_);
- /* -- 播放前参数配置可加在此处 -- */
-
- return true;
- }
停止播放:
- /*
- * SmartPlayerLinuxMono.cs
- * Author: daniusdk.com
- */
- private void StopPlayer(int sel)
- {
- Debug.Log("StopPlayer++, sel: " + sel);
-
- videoctrl[sel].is_need_get_frame_ = false;
- videoctrl[sel].is_need_init_texture_ = false;
-
- if (videoctrl[sel].player_handle_ == IntPtr.Zero)
- {
- return;
- }
-
- UInt32 flag = NTSmartPlayerSDK.NT_SP_StopPlay(videoctrl[sel].player_handle_);
- if (flag == DANIULIVE_RETURN_OK)
- {
- Debug.Log("call NT_SP_StopPlay succeed, sel: " + sel);
- }
- else
- {
- Debug.LogError("call NT_SP_StopPlay failed, sel: " + sel);
- }
-
- NTSmartPlayerSDK.NT_SP_Close(videoctrl[sel].player_handle_);
- videoctrl[sel].player_handle_ = IntPtr.Zero;
-
- videoctrl[sel].is_playing_ = false;
- }
具体回调处理:
- private void SDKVideoFrameCallBack(UInt32 status, IntPtr frame, int sel)
- {
- //这里拿到回调frame,进行相关操作
- NT_SP_VideoFrame video_frame = (NT_SP_VideoFrame)Marshal.PtrToStructure(frame, typeof(NT_SP_VideoFrame));
-
- VideoFrame u3d_frame = new VideoFrame();
-
- u3d_frame.width_ = video_frame.width_;
- u3d_frame.height_ = video_frame.height_;
-
- u3d_frame.timestamp_ = (UInt64)video_frame.timestamp_;
-
- int d_y_stride = video_frame.width_;
- int d_u_stride = (video_frame.width_ + 1) / 2;
- int d_v_stride = d_u_stride;
-
- int d_y_size = d_y_stride * video_frame.height_;
- int d_u_size = d_u_stride * ((video_frame.height_ + 1) / 2);
- int d_v_size = d_u_size;
-
- int u_v_height = ((u3d_frame.height_ + 1) / 2);
-
- u3d_frame.y_stride_ = d_y_stride;
- u3d_frame.u_stride_ = d_u_stride;
- u3d_frame.v_stride_ = d_v_stride;
-
- u3d_frame.y_data_ = new byte[d_y_size];
- u3d_frame.u_data_ = new byte[d_u_size];
- u3d_frame.v_data_ = new byte[d_v_size];
-
-
- CopyFramePlane(u3d_frame.y_data_, d_y_stride,
- video_frame.plane0_, video_frame.stride0_, u3d_frame.height_);
-
- CopyFramePlane(u3d_frame.u_data_, d_u_stride,
- video_frame.plane1_, video_frame.stride1_, u_v_height);
-
- CopyFramePlane(u3d_frame.v_data_, d_v_stride,
- video_frame.plane2_, video_frame.stride2_, u_v_height);
-
- lock (videoctrl[sel].frame_lock_ )
- {
- videoctrl[sel].cur_video_frame_ = u3d_frame;
- //Debug.LogError("sel: " + sel + " w:" + u3d_frame.width_ + "h:" + u3d_frame.height_);
- }
- }
Unity层拿到video frame后,刷新即可:
- private void UpdateProc(int sel)
- {
- VideoFrame video_frame = null;
-
- lock (videoctrl[sel].frame_lock_)
- {
- video_frame = videoctrl[sel].cur_video_frame_;
-
- videoctrl[sel].cur_video_frame_ = null;
- }
-
- if ( video_frame == null )
- return;
-
- if (!videoctrl[sel].is_need_get_frame_)
- return;
-
- if (videoctrl[sel].player_handle_ == IntPtr.Zero )
- return;
-
- if ( !videoctrl[sel].is_need_init_texture_)
- {
- if ( video_frame.width_ != videoctrl[sel].video_width_
- || video_frame.height_ != videoctrl[sel].video_height_
- || video_frame.y_stride_ != videoctrl[sel].y_row_bytes_
- || video_frame.u_stride_ != videoctrl[sel].u_row_bytes_
- || video_frame.v_stride_ != videoctrl[sel].v_row_bytes_ )
- {
- videoctrl[sel].is_need_init_texture_ = true;
- }
- }
-
- if (videoctrl[sel].is_need_init_texture_)
- {
- if (InitYUVTexture(video_frame, sel))
- {
- videoctrl[sel].is_need_init_texture_ = false;
- }
- }
-
- UpdateYUVTexture(video_frame, sel);
- }
UpdateYUVTexture相关实现:
- private void UpdateYUVTexture(VideoFrame video_frame, int sel)
- {
- if (video_frame.y_data_ == null || video_frame.u_data_ == null || video_frame.v_data_ == null)
- {
- Debug.Log("video frame with null..");
- return;
- }
-
- if (videoctrl[sel].yTexture_ != null)
- {
- videoctrl[sel].yTexture_.LoadRawTextureData(video_frame.y_data_);
- videoctrl[sel].yTexture_.Apply();
- }
-
- if (videoctrl[sel].uTexture_ != null)
- {
- videoctrl[sel].uTexture_.LoadRawTextureData(video_frame.u_data_);
- videoctrl[sel].uTexture_.Apply();
- }
-
- if (videoctrl[sel].vTexture_ != null)
- {
- videoctrl[sel].vTexture_.LoadRawTextureData(video_frame.v_data_);
- videoctrl[sel].vTexture_.Apply();
- }
- }
以上是Linux平台下Unity RTMP、RTSP直播播放器大概的实现参考,随着国产操作系统的推进,Linux下RTMP、RTSP高质量的播放器需求越来越大,Unity下,可以实现和Windows、Android等平台统一开发管理,非常方便。感兴趣的公司或开发者,可以单独跟我沟通探讨。
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