庖丁解牛之-Android平台RTSP|RTMP播放器设计

·  阅读 135

背景

我们在做Android平台RTSP或者RTMP播放器开发的时候,需要注意的点非常多,以下,以大牛直播SDK(官方)的接口为例,大概介绍下相关接口设计:

接口设计

1. Open() 接口

Open接口的目的,主要是创建实例,正常返回player实例句柄,如有多路播放诉求,创建多个实例即可。

	/**
	 * Initialize Player(启动播放实例)
	 *
	 * @param ctx: get by this.getApplicationContext()
	 *
	 * <pre>This function must be called firstly.</pre>
	 *
	 * @return player handle if successful, if return 0, which means init failed. 
	 */

	public native long SmartPlayerOpen(Object ctx);
复制代码

2. Close()接口

Close接口,和Open()接口对应,负责释放相应实例的资源,调用Close()接口后,记得实例句柄置0即可。

**注意:**比如一个实例既可以实现播放,又可同时录像,亦或拉流(转发),这种情况下,调Close()接口时,需要确保录像、拉流都正常停止后,再调用。

	/**
	 * 关闭播放实例,结束时必须调用close接口释放资源
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * <pre> NOTE: it could not use player handle after call this function. </pre> 
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerClose(long handle);
复制代码

3. 网络状态回调

一个好的播放器,好的状态回调必不可少,比如网络连通状态、快照、录像状态、当前下载速度等实时反馈,可以让上层开发者更好的掌控播放端状态,给用户更好的播放体验。

	/**
	 * Set callback event(设置事件回调)
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @param callbackv2: callback function
	 *
	 * @return {0} if successful
	 */
	public native int SetSmartPlayerEventCallbackV2(long handle, NTSmartEventCallbackV2 callbackv2);
复制代码

demo实现实例:

    class EventHandeV2 implements NTSmartEventCallbackV2 {
        @Override
        public void onNTSmartEventCallbackV2(long handle, int id, long param1,
                                             long param2, String param3, String param4, Object param5) {

            //Log.i(TAG, "EventHandeV2: handle=" + handle + " id:" + id);

            String player_event = "";

            switch (id) {
                case NTSmartEventID.EVENT_DANIULIVE_ERC_PLAYER_STARTED:
                    player_event = "开始..";
                    break;
                case NTSmartEventID.EVENT_DANIULIVE_ERC_PLAYER_CONNECTING:
                    player_event = "连接中..";
                    break;
                case NTSmartEventID.EVENT_DANIULIVE_ERC_PLAYER_CONNECTION_FAILED:
                    player_event = "连接失败..";
                    break;
                case NTSmartEventID.EVENT_DANIULIVE_ERC_PLAYER_CONNECTED:
                    player_event = "连接成功..";
                    break;
                case NTSmartEventID.EVENT_DANIULIVE_ERC_PLAYER_DISCONNECTED:
                    player_event = "连接断开..";
                    break;
                case NTSmartEventID.EVENT_DANIULIVE_ERC_PLAYER_STOP:
                    player_event = "停止播放..";
                    break;
                case NTSmartEventID.EVENT_DANIULIVE_ERC_PLAYER_RESOLUTION_INFO:
                    player_event = "分辨率信息: width: " + param1 + ", height: " + param2;
                    break;
                case NTSmartEventID.EVENT_DANIULIVE_ERC_PLAYER_NO_MEDIADATA_RECEIVED:
                    player_event = "收不到媒体数据,可能是url错误..";
                    break;
                case NTSmartEventID.EVENT_DANIULIVE_ERC_PLAYER_SWITCH_URL:
                    player_event = "切换播放URL..";
                    break;
                case NTSmartEventID.EVENT_DANIULIVE_ERC_PLAYER_CAPTURE_IMAGE:
                    player_event = "快照: " + param1 + " 路径:" + param3;

                    if (param1 == 0) {
                        player_event = player_event + ", 截取快照成功";
                    } else {
                        player_event = player_event + ", 截取快照失败";
                    }
                    break;

                case NTSmartEventID.EVENT_DANIULIVE_ERC_PLAYER_RECORDER_START_NEW_FILE:
                    player_event = "[record]开始一个新的录像文件 : " + param3;
                    break;
                case NTSmartEventID.EVENT_DANIULIVE_ERC_PLAYER_ONE_RECORDER_FILE_FINISHED:
                    player_event = "[record]已生成一个录像文件 : " + param3;
                    break;

                case NTSmartEventID.EVENT_DANIULIVE_ERC_PLAYER_START_BUFFERING:
                    Log.i(TAG, "Start Buffering");
                    break;

                case NTSmartEventID.EVENT_DANIULIVE_ERC_PLAYER_BUFFERING:
                    Log.i(TAG, "Buffering:" + param1 + "%");
                    break;

                case NTSmartEventID.EVENT_DANIULIVE_ERC_PLAYER_STOP_BUFFERING:
                    Log.i(TAG, "Stop Buffering");
                    break;

                case NTSmartEventID.EVENT_DANIULIVE_ERC_PLAYER_DOWNLOAD_SPEED:
                    player_event = "download_speed:" + param1 + "Byte/s" + ", "
                            + (param1 * 8 / 1000) + "kbps" + ", " + (param1 / 1024)
                            + "KB/s";
                    break;

                case NTSmartEventID.EVENT_DANIULIVE_ERC_PLAYER_RTSP_STATUS_CODE:
                    Log.e(TAG, "RTSP error code received, please make sure username/password is correct, error code:" + param1);
                    player_event = "RTSP error code:" + param1;
                    break;

                case NTSmartEventID.EVENT_DANIULIVE_ERC_PLAYER_NEED_KEY:
                    Log.e(TAG, "RTMP加密流,请设置播放需要的Key..");
                    player_event = "RTMP加密流,请设置播放需要的Key..";
                    break;

                case NTSmartEventID.EVENT_DANIULIVE_ERC_PLAYER_KEY_ERROR:
                    Log.e(TAG, "RTMP加密流,Key错误,请重新设置..");
                    player_event = "RTMP加密流,Key错误,请重新设置..";
                    break;
            }

            if (player_event.length() > 0) {
                Log.i(TAG, player_event);
                Message message = new Message();
                message.what = PLAYER_EVENT_MSG;
                message.obj = player_event;
                handler.sendMessage(message);
            }
        }
    }
复制代码

4. 软解码还是硬解码?

随着Android发展越来越好,各个厂商芯片对硬解码的支持,也越来越友好,一般情况下,如果适合通用的产品,在设备性能保障的情况下,优先建议软解,如果特定机型设备,可酌情考虑硬解,硬解码,又分为264硬解、HEVC硬解,直接设置surface模式的硬解,接口如下:

	/**
	 * Set Video H.264 HW decoder(设置H.264硬解码)
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @param isHWDecoder: 0: software decoder; 1: hardware decoder.
	 *
	 * @return {0} if successful
	 */
	public native int SetSmartPlayerVideoHWDecoder(long handle, int isHWDecoder);

	/**
	 * Set Video H.265(hevc) HW decoder(设置H.265硬解码)
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @param isHevcHWDecoder: 0: software decoder; 1: hardware decoder.
	 *
	 * @return {0} if successful
	 */
	public native int SetSmartPlayerVideoHevcHWDecoder(long handle, int isHevcHWDecoder);
复制代码

设置surface模式的硬解:

	/**
	 * 设置视频硬解码下Mediacodec自行绘制模式(此种模式下,硬解码兼容性和效率更好,回调YUV/RGB和快照功能将不可用)
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @param isHWRenderMode: 0: not enable; 1: 用SmartPlayerSetSurface设置的surface自行绘制
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerSetHWRenderMode(long handle, int isHWRenderMode);

	/**
	 * 更新硬解码surface
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerUpdateHWRenderSurface(long handle);
复制代码

5. 音频输出类型

音频输出,android平台支持audiotrack模式和opensl es模式,一般来说,考虑到设备通用性,建议采用audiotrack模式。

	/**
	 * Set AudioOutput Type(设置audio输出类型)
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @param use_audiotrack:
	 *
	 * <pre> NOTE: if use_audiotrack with 0: it will use auto-select output devices; if with 1: will use audio-track mode. </pre>
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerSetAudioOutputType(long handle, int use_audiotrack);
复制代码

6. 缓冲时间设置

缓冲时间,顾名思义,缓存多少数据才开始播放,比如设置2000ms的buffer time,直播模式下,收到2秒数据后,才正常播放。

加大buffer time,会增大播放延迟,好处是,网络抖动的时候,流畅性更好。

	/**
	 * Set buffer(设置缓冲时间,单位:毫秒)
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @param buffer:
	 *
	 * <pre> NOTE: Unit is millisecond, range is 0-5000 ms </pre>
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerSetBuffer(long handle, int buffer);
复制代码

7. 实时静音、实时音量调节

实时静音、实时音量调节顾名思义,播放端可以实时调整播放音量,或者直接静音掉,特别是多路播放场景下,非常有必要。

此外我们还提供了音量放大的功能,支持放大至原始音量的2倍。

	/**
	 * Set mute or not(设置实时静音)
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @param is_mute: if with 1:mute, if with 0: does not mute
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerSetMute(long handle, int is_mute);

	/**
	 * 设置播放音量
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @param volume: 范围是[0, 100], 0是静音,100是最大音量, 默认是100
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerSetAudioVolume(long handle, int volume);
复制代码

8. RTSP TCP-UDP模式设置、超时时间设置或模式切换

有的RTSP服务器或摄像机,只支持RTSP TCP模式或者UDP模式,这个时候,默认设置TCP、UDP模式就至关重要,此外,我们还设计支持如TCP或UDP模式收不到数据,在超时时间后,可以自动切换到UDP或TCP。

	/**
	 * 设置RTSP TCP/UDP模式(默认UDP模式)
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @param is_using_tcp: if with 1, it will via TCP mode, while 0 with UDP mode
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerSetRTSPTcpMode(long handle, int is_using_tcp);

	/**
	 * 设置RTSP超时时间, timeout单位为秒,必须大于0
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @param timeout: RTSP timeout setting
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerSetRTSPTimeout(long handle, int timeout);

	/**
	 * 设置RTSP TCP/UDP自动切换
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * NOTE: 对于RTSP来说,有些可能支持rtp over udp方式,有些可能支持使用rtp over tcp方式.
	 * 为了方便使用,有些场景下可以开启自动尝试切换开关, 打开后如果udp无法播放,sdk会自动尝试tcp, 如果tcp方式播放不了,sdk会自动尝试udp.
	 *
	 * @param is_auto_switch_tcp_udp 如果设置1的话, sdk将在tcp和udp之间尝试切换播放,如果设置为0,则不尝试切换.
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerSetRTSPAutoSwitchTcpUdp(long handle, int is_auto_switch_tcp_udp);
复制代码

9. 快速启动

快速启动,主要是针对服务器缓存GOP的场景下,快速刷到最新的数据,确保画面的持续性。

	/**
	 * Set fast startup(设置快速启动模式,此模式针对服务器缓存GOP的场景有效)
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @param is_fast_startup: if with 1, it will second play back, if with 0: does not it
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerSetFastStartup(long handle, int is_fast_startup);
复制代码

10. 低延迟模式

低延迟模式下,设置buffer time为0,延迟更低,适用于比如需要操控控制的超低延迟场景下。

	/**
	 * Set low latency mode(设置低延迟模式)
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @param mode: if with 1, low latency mode, if with 0: normal mode
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerSetLowLatencyMode(long handle, int mode);
复制代码

11. 视频view旋转、水平|垂直翻转

接口主要用于,比如原始的视频倒置等场景下,设备端无法调整时,通过播放端完成图像的正常角度播放。

	/**
	 * 设置视频垂直反转
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @param is_flip: 0: 不反转, 1: 反转
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerSetFlipVertical(long handle, int is_flip);

	/**
	 * 设置视频水平反转
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @param is_flip: 0: 不反转, 1: 反转
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerSetFlipHorizontal(long handle, int is_flip);

	/**
	 * 设置顺时针旋转, 注意除了0度之外, 其他角度都会额外消耗性能
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @param degress: 当前支持 0度,90度, 180度, 270度 旋转
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerSetRotation(long handle, int degress);
复制代码

12. 设置实时回调下载速度

调用实时下载速度接口,通过设置下载速度时间间隔,和是否需要上报当前下载速度,实现APP层和底层SDK更友好的交互。

	/**
	 * Set report download speed(设置实时回调下载速度)
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @param is_report: if with 1, it will report download speed, it with 0: does not it.
	 *
	 * @param report_interval: report interval, unit is second, it must be greater than 0.
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerSetReportDownloadSpeed(long handle, int is_report, int report_interval );
复制代码

13. 实时快照

简单来说,播放过程中,是不是要存取当前的播放画面。

	/**
	 * Set if needs to save image during playback stream(是否启动快照功能)
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @param is_save_image: if with 1, it will save current image via the interface of SmartPlayerSaveCurImage(), if with 0: does not it
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerSaveImageFlag(long handle, int is_save_image);

	/**
	 * Save current image during playback stream(实时快照)
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @param imageName: image name, which including fully path, "/sdcard/daniuliveimage/daniu.png", etc.
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerSaveCurImage(long handle, String imageName);
复制代码

14. 扩展录像操作

播放端录像,我们做的非常细化,比如可以只录制音频或者只录制视频,设置录像存储路径,设置单个文件size,如果非AAC数据,可以转AAC后再录像。

	/**
	 * Create file directory(创建录像目录)
	 *
	 * @param path,  E.g: /sdcard/daniulive/rec
	 *
	 * <pre> The interface is only used for recording the stream data to local side. </pre>
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerCreateFileDirectory(String path);

	/**
	 * Set recorder directory(设置录像目录)
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @param path: the directory of recorder file
	 *
	 * <pre> NOTE: make sure the path should be existed, or else the setting failed. </pre>
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerSetRecorderDirectory(long handle, String path);

	/**
	 * Set the size of every recorded file(设置单个录像文件大小,如超过设定大小则自动切换到下个文件录制)
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @param size: (MB), (5M~500M), if not in this range, set default size with 200MB.
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerSetRecorderFileMaxSize(long handle, int size);

	/*
	 * 设置录像时音频转AAC编码的开关
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * aac比较通用,sdk增加其他音频编码(比如speex, pcmu, pcma等)转aac的功能.
	 *
	 * @param is_transcode: 设置为1的话,如果音频编码不是aac,则转成aac,如果是aac,则不做转换. 设置为0的话,则不做任何转换. 默认是0.
	 *
	 * 注意: 转码会增加性能消耗
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerSetRecorderAudioTranscodeAAC(long handle, int is_transcode);
	
	
	/*
	*设置是否录视频,默认的话,如果视频源有视频就录,没有就没得录, 但有些场景下可能不想录制视频,只想录音频,所以增加个开关
	*
	*@param is_record_video: 1 表示录制视频, 0 表示不录制视频, 默认是1
	*
	* @return {0} if successful
	*/
	public native int SmartPlayerSetRecorderVideo(long handle, int is_record_video);
	
	
	/*
	*设置是否录音频,默认的话,如果视频源有音频就录,没有就没得录, 但有些场景下可能不想录制音频,只想录视频,所以增加个开关
	*
	*@param is_record_audio: 1 表示录制音频, 0 表示不录制音频, 默认是1
	*
	* @return {0} if successful
	*/
	public native int SmartPlayerSetRecorderAudio(long handle, int is_record_audio);
复制代码

	/**
	 * Start recorder stream(开始录像)
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerStartRecorder(long handle);

	/**
	 * Stop recorder stream(停止录像)
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerStopRecorder(long handle);
复制代码

15. 拉流回调编码后的数据(配合转发模块使用)

拉流回调编码后的数据,主要是为了配合转发模块使用,比如拉取rtsp流数据,直接转RTMP推送到RTMP服务。

	/*
	 * 设置拉流时音频转AAC编码的开关
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * aac比较通用,sdk增加其他音频编码(比如speex, pcmu, pcma等)转aac的功能.
	 *
	 * @param is_transcode: 设置为1的话,如果音频编码不是aac,则转成aac, 如果是aac,则不做转换. 设置为0的话,则不做任何转换. 默认是0.

	 * 注意: 转码会增加性能消耗
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerSetPullStreamAudioTranscodeAAC(long handle, int is_transcode);

	/**
	 * Start pull stream(开始拉流,用于数据转发,只拉流不播放)
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerStartPullStream(long handle);

	/**
	 * Stop pull stream(停止拉流)
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerStopPullStream(long handle);
复制代码

	/**
	 * Set Audio Data Callback(设置回调编码后音频数据)
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @param audio_data_callback: Audio Data Callback.
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerSetAudioDataCallback(long handle, Object audio_data_callback);

	/**
	 * Set Video Data Callback(设置回调编码后视频数据)
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @param video_data_callback: Video Data Callback.
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerSetVideoDataCallback(long handle, Object video_data_callback);
复制代码

16. H264用户数据回调或SEI数据回调

如发送端在264编码时,加了自定义的user data数据,可以通过以下接口实现数据回调,如需直接回调SEI数据,调下面SEI回调接口即可。

	/**
	 * Set user data Callback(设置回调SEI扩展用户数据)
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @param user_data_callback: user data callback.
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerSetUserDataCallback(long handle, Object user_data_callback);

	/**
	 * Set SEI data Callback(设置回调SEI数据)
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @param sei_data_callback: sei data callback.
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerSetSEIDataCallback(long handle, Object sei_data_callback);
复制代码

17. 设置回调解码后YUV、RGB数据

如需对解码后的yuv或rgb数据,进行二次处理,如人脸识别等,可以通回调yuv rgb接口实现数据二次处理。

以YUV为例:

    class I420ExternalRender implements NTExternalRender {
        // public static final int NT_FRAME_FORMAT_RGBA = 1;
        // public static final int NT_FRAME_FORMAT_ABGR = 2;
        // public static final int NT_FRAME_FORMAT_I420 = 3;

        private int width_ = 0;
        private int height_ = 0;

        private int y_row_bytes_ = 0;
        private int u_row_bytes_ = 0;
        private int v_row_bytes_ = 0;

        private ByteBuffer y_buffer_ = null;
        private ByteBuffer u_buffer_ = null;
        private ByteBuffer v_buffer_ = null;

        @Override
        public int getNTFrameFormat() {
            Log.i(TAG, "I420ExternalRender::getNTFrameFormat return "
                    + NT_FRAME_FORMAT_I420);
            return NT_FRAME_FORMAT_I420;
        }

        @Override
        public void onNTFrameSizeChanged(int width, int height) {
            width_ = width;
            height_ = height;

            y_row_bytes_ = (width_ + 15) & (~15);
            u_row_bytes_ = ((width_ + 1) / 2 + 15) & (~15);
            v_row_bytes_ = ((width_ + 1) / 2 + 15) & (~15);

            y_buffer_ = ByteBuffer.allocateDirect(y_row_bytes_ * height_);
            u_buffer_ = ByteBuffer.allocateDirect(u_row_bytes_
                    * ((height_ + 1) / 2));
            v_buffer_ = ByteBuffer.allocateDirect(v_row_bytes_
                    * ((height_ + 1) / 2));

            Log.i(TAG, "I420ExternalRender::onNTFrameSizeChanged width_="
                    + width_ + " height_=" + height_ + " y_row_bytes_="
                    + y_row_bytes_ + " u_row_bytes_=" + u_row_bytes_
                    + " v_row_bytes_=" + v_row_bytes_);
        }

        @Override
        public ByteBuffer getNTPlaneByteBuffer(int index) {
            if (index == 0) {
                return y_buffer_;
            } else if (index == 1) {
                return u_buffer_;
            } else if (index == 2) {
                return v_buffer_;
            } else {
                Log.e(TAG, "I420ExternalRender::getNTPlaneByteBuffer index error:" + index);
                return null;
            }
        }

        @Override
        public int getNTPlanePerRowBytes(int index) {
            if (index == 0) {
                return y_row_bytes_;
            } else if (index == 1) {
                return u_row_bytes_;
            } else if (index == 2) {
                return v_row_bytes_;
            } else {
                Log.e(TAG, "I420ExternalRender::getNTPlanePerRowBytes index error:" + index);
                return 0;
            }
        }

        public void onNTRenderFrame(int width, int height, long timestamp) {
            if (y_buffer_ == null)
                return;

            if (u_buffer_ == null)
                return;

            if (v_buffer_ == null)
                return;


            y_buffer_.rewind();

            u_buffer_.rewind();

            v_buffer_.rewind();

    		/*
    		if ( !is_saved_image )
    		{
    			is_saved_image = true;

    			int y_len = y_row_bytes_*height_;

    			int u_len = u_row_bytes_*((height_+1)/2);
    			int v_len = v_row_bytes_*((height_+1)/2);

    			int data_len = y_len + (y_row_bytes_*((height_+1)/2));

    			byte[] nv21_data = new byte[data_len];

    			byte[] u_data = new byte[u_len];
    			byte[] v_data = new byte[v_len];

    			y_buffer_.get(nv21_data, 0, y_len);
    			u_buffer_.get(u_data, 0, u_len);
    			v_buffer_.get(v_data, 0, v_len);

    			int[] strides = new int[2];
    			strides[0] = y_row_bytes_;
    			strides[1] = y_row_bytes_;


    			int loop_row_c = ((height_+1)/2);
    			int loop_c = ((width_+1)/2);

    			int dst_row = y_len;
    			int src_v_row = 0;
    			int src_u_row = 0;

    			for ( int i = 0; i < loop_row_c; ++i)
    			{
    				int dst_pos = dst_row;

    				for ( int j = 0; j <loop_c; ++j )
    				{
    					nv21_data[dst_pos++] = v_data[src_v_row + j];
    					nv21_data[dst_pos++] = u_data[src_u_row + j];
    				}

    				dst_row   += y_row_bytes_;
    				src_v_row += v_row_bytes_;
    				src_u_row += u_row_bytes_;
    			}

    			String imagePath = "/sdcard" + "/" + "testonv21" + ".jpeg";

    			Log.e(TAG, "I420ExternalRender::begin test save iamge++ image_path:" + imagePath);

    			try
    			{
    				File file = new File(imagePath);

        			FileOutputStream image_os = new FileOutputStream(file);

        			YuvImage image = new YuvImage(nv21_data, ImageFormat.NV21, width_, height_, strides);

        			image.compressToJpeg(new android.graphics.Rect(0, 0, width_, height_), 50, image_os);

        			image_os.flush();
        			image_os.close();
    			}
    			catch(IOException e)
    			{
    				e.printStackTrace();
    			}

    			Log.e(TAG, "I420ExternalRender::begin test save iamge--");
    		}

    		*/


            Log.i(TAG, "I420ExternalRender::onNTRenderFrame w=" + width + " h=" + height + " timestamp=" + timestamp);

            // copy buffer

            // test
            // byte[] test_buffer = new byte[16];
            // y_buffer_.get(test_buffer);

            // Log.i(TAG, "I420ExternalRender::onNTRenderFrame y data:" + bytesToHexString(test_buffer));

            // u_buffer_.get(test_buffer);
            // Log.i(TAG, "I420ExternalRender::onNTRenderFrame u data:" + bytesToHexString(test_buffer));

            // v_buffer_.get(test_buffer);
            // Log.i(TAG, "I420ExternalRender::onNTRenderFrame v data:" + bytesToHexString(test_buffer));
        }
    }
复制代码

18. 设置视频画面填充模式

设置视频画面的填充模式,如填充整个view、等比例填充view,如不设置,默认填充整个view。

相关接口设计如下:

	/**
	 * 设置视频画面的填充模式,如填充整个view、等比例填充view,如不设置,默认填充整个view
	 * @param handle: return value from SmartPlayerOpen()
	 * @param render_scale_mode 0: 填充整个view; 1: 等比例填充view, 默认值是0
	 * @return {0} if successful
	 */
	public native int SmartPlayerSetRenderScaleMode(long handle, int render_scale_mode);
复制代码

19. 设置SurfaceView模式下render类型

format: 0: RGB565格式,如不设置,默认此模式; 1: ARGB8888格式

	/**
	 * 设置SurfaceView模式下(NTRenderer.CreateRenderer第二个参数传false的情况),render类型
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @param format: 0: RGB565格式,如不设置,默认此模式; 1: ARGB8888格式
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerSetSurfaceRenderFormat(long handle, int format);
复制代码

20. 设置surfaceview模式下抗锯齿

需要注意的是:抗锯齿模式开启后,会增加性能消耗。

	/**
	 * 设置SurfaceView模式下(NTRenderer.CreateRenderer第二个参数传false的情况),抗锯齿效果,注意:抗锯齿模式开启后,可能会影像性能,请慎用
	 *
	 * @param handle: return value from SmartPlayerOpen()
	 *
	 * @param isEnableAntiAlias: 0: 如不设置,默认不开启抗锯齿模式; 1: 开启抗锯齿模式
	 *
	 * @return {0} if successful
	 */
	public native int SmartPlayerSetSurfaceAntiAlias(long handle, int isEnableAntiAlias);
复制代码

总结

以上就是Android平台RTSP、RTMP播放器接口设计需要参考的点,对于大多数开发者来说,不一定需要实现上述所有部分,只要按照产品诉求,实现其中的40%就足够满足特定场景使用了。

一个好的播放器,特别是要满足低延迟稳定的播放(毫秒级延迟),需要注意的点远不止如此,感兴趣的开发者,可以参考blog其他文章。

分类:
Android
标签: