许多开发者在做智慧教室同屏亦或会议同屏时，基于Andriod平台采集屏幕并编码推送，往往遇到各种各样的问题，以下就我们开发过程中的一些技术考量做个分享，权当抛砖引玉：
协议选择、数据来源和处理
1. 内网环境下，组播还是RTMP？
回答：这个问题，被无数的开发者问到，为此，单独写了篇博客论证：https://blog.csdn.net/renhui1112/article/details/86741428，感兴趣的可以参考下，简单来说，能RTMP的，就RTMP，如果真是内网环境下，没有并发瓶颈的同屏，可以启动内置RTSP服务（走单播），然后，其他终端拉流也不失为一个好的方案。
2. 推送分辨率如何设定或缩放？
回答：一般来说，好多Android设备，特别是高分屏，拿到的视频原始宽高非常大，如果推原始分辨率，编码和上行压力大，所以，一般建议，适当缩放，比如宽高缩放至2/3，缩放一般建议等比例缩放，此外，缩放宽高建议16字节对齐。
废话不多说，上实例代码：
private void createScreenEnvironment() { sreenWindowWidth = mWindowManager.getDefaultDisplay().getWidth(); screenWindowHeight = mWindowManager.getDefaultDisplay().getHeight(); Log.i(TAG, "screenWindowWidth: " + sreenWindowWidth + ",screenWindowHeight: " + screenWindowHeight); if (sreenWindowWidth > 800) { if (screenResolution == SCREEN_RESOLUTION_STANDARD) { scale_rate = SCALE_RATE_HALF; sreenWindowWidth = align(sreenWindowWidth / 2, 16); screenWindowHeight = align(screenWindowHeight / 2, 16); } else if(screenResolution == SCREEN_RESOLUTION_LOW) { scale_rate = SCALE_RATE_TWO_FIFTHS; sreenWindowWidth = align(sreenWindowWidth * 2 / 5, 16); } } Log.i(TAG, "After adjust mWindowWidth: " + sreenWindowWidth + ", mWindowHeight: " + screenWindowHeight); int pf = mWindowManager.getDefaultDisplay().getPixelFormat(); Log.i(TAG, "display format:" + pf); DisplayMetrics displayMetrics = new DisplayMetrics(); mWindowManager.getDefaultDisplay().getMetrics(displayMetrics); mScreenDensity = displayMetrics.densityDpi; mImageReader = ImageReader.newInstance(sreenWindowWidth, screenWindowHeight, 0x1, 6); mMediaProjectionManager = (MediaProjectionManager) getSystemService(Context.MEDIA_PROJECTION_SERVICE); }
3. 横竖屏自动适配
回答：因为横竖屏状态下，采集的屏幕宽高不一样，如果横竖屏切换，这个时候，需要考虑到横竖屏适配问题，确保比如竖屏状态下，切换到横屏时，推拉流两端可以自动适配，横竖屏自动适配，编码器需要重启，拉流端，需要能自动适配宽高变化，自动播放。
4. 一定的补帧策略
回答：好多人不理解为什么要补帧，实际上，屏幕采集的时候，屏幕不动的话，不会一直有数据下去，这个时候，比较好的做法是，保存最后一帧数据，设定一定的补帧间隔，确保不会因为帧间距太大，导致播放端几秒都收不到数据，当然，如果服务器可以缓存GOP，这个问题迎刃而解。
5. 异常网络处理、事件回调机制
回答：如果是走RTMP，网络抖动或者其他网络异常，需要有好重连机制和状态回馈机制。
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 publisher_event = ""; switch (id) { case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_STARTED: publisher_event = "开始.."; break; case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_CONNECTING: publisher_event = "连接中.."; break; case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_CONNECTION_FAILED: publisher_event = "连接失败.."; break; case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_CONNECTED: publisher_event = "连接成功.."; break; case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_DISCONNECTED: publisher_event = "连接断开.."; break; case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_STOP: publisher_event = "关闭.."; break; case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_RECORDER_START_NEW_FILE: publisher_event = "开始一个新的录像文件 : " + param3; break; case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_ONE_RECORDER_FILE_FINISHED: publisher_event = "已生成一个录像文件 : " + param3; break; case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_SEND_DELAY: publisher_event = "发送时延: " + param1 + " 帧数:" + param2; break; case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_CAPTURE_IMAGE: publisher_event = "快照: " + param1 + " 路径：" + param3; if (param1 == 0) { publisher_event = publisher_event + "截取快照成功.."; } else { publisher_event = publisher_event + "截取快照失败.."; } break; case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_RTSP_URL: publisher_event = "RTSP服务URL: " + param3; break; case NTSmartEventID.EVENT_DANIULIVE_ERC_PUSH_RTSP_SERVER_RESPONSE_STATUS_CODE: publisher_event ="RTSP status code received, codeID: " + param1 + ", RTSP URL: " + param3; break; case NTSmartEventID.EVENT_DANIULIVE_ERC_PUSH_RTSP_SERVER_NOT_SUPPORT: publisher_event ="服务器不支持RTSP推送, 推送的RTSP URL: " + param3; break; } String str = "当前回调状态：" + publisher_event; Log.i(TAG, str); Message message = new Message(); message.what = PUBLISHER_EVENT_MSG; message.obj = publisher_event; handler.sendMessage(message); } }
6. 部分屏幕数据采集
回答：我们遇到的好多场景下，教室端，会拿出来3/4的区域用来投递给学生看，1/4的区域，用来做一些指令等操作，这个时候，就需要考虑屏幕区域裁剪，接口可做如下设计：
/** * 投递裁剪过的RGBA数据 * * @param data: RGBA data * * @param rowStride: stride information * * @param width: width * * @param height: height * * @param clipedLeft: 左; clipedTop: 上; clipedwidth: 裁剪后的宽; clipedHeight: 裁剪后的高; 确保传下去裁剪后的宽、高均为偶数 * * @return {0} if successful */ public native int SmartPublisherOnCaptureVideoClipedRGBAData(long handle, ByteBuffer data, int rowStride, int width, int height, int clipedLeft, int clipedTop, int clipedWidth, int clipedHeight);
//实际裁剪比例，可酌情自行调整 int left = 100; int cliped_left = 0; int top = 0; int cliped_top = 0; int cliped_width = width_; int cliped_height = height_; if(scale_rate == SCALE_RATE_HALF) { cliped_left = left / 2; cliped_top = top / 2; //宽度裁剪后，展示3/4比例 cliped_width = (width_ *3)/4; //高度不做裁剪 cliped_height = height_; } else if(scale_rate == SCALE_RATE_TWO_FIFTHS) { cliped_left = left * 2 / 5; cliped_top = top * 2 / 5; //宽度裁剪后，展示3/4比例 cliped_width = (width_ *3)/4; //高度不做裁剪 cliped_height = height_; } if(cliped_width % 2 != 0) { cliped_width = cliped_width + 1; } if(cliped_height % 2 != 0) { cliped_height = cliped_height + 1; } if ( (cliped_left + cliped_width) > width_) { Log.e(TAG, " invalid cliped region settings, cliped_left: " + cliped_left + " cliped_width:" + cliped_width + " width:" + width_); return; } if ( (cliped_top + cliped_height) > height_) { Log.e(TAG, "invalid cliped region settings, cliped_top: " + cliped_top + " cliped_height:" + cliped_height + " height:" + height_); return; } //Log.i(TAG, " clipLeft: " + cliped_left + " clipTop: " + cliped_top + " clipWidth: " + cliped_width + " clipHeight: " + cliped_height); libPublisher.SmartPublisherOnCaptureVideoClipedRGBAData(publisherHandle, last_buffer, row_stride_, width_, height_, cliped_left, cliped_top, cliped_width, cliped_height );
7. 文字、图片水印
回答：好多场景下，同屏者会把公司logo，和一定的文字信息展示在推送端，这个时候，需要考虑到文字和图片水印问题，具体可参考如下接口设置：
/** * Set Text water-mark(设置文字水印) * * @param fontSize: it should be "MEDIUM", "SMALL", "BIG" * * @param waterPostion: it should be "TOPLEFT", "TOPRIGHT", "BOTTOMLEFT", "BOTTOMRIGHT". * * @param xPading, yPading: the distance of the original picture. * * <pre> The interface is only used for setting font water-mark when publishing stream. </pre> * * @return {0} if successful */ public native int SmartPublisherSetTextWatermark(long handle, String waterText, int isAppendTime, int fontSize, int waterPostion, int xPading, int yPading); /** * Set Text water-mark font file name(设置文字水印字体路径) * * @param fontFileName: font full file name, e.g: /system/fonts/DroidSansFallback.ttf * * @return {0} if successful */ public native int SmartPublisherSetTextWatermarkFontFileName(long handle, String fontFileName); /** * Set picture water-mark(设置png图片水印) * * @param picPath: the picture working path, e.g: /sdcard/logo.png * * @param waterPostion: it should be "TOPLEFT", "TOPRIGHT", "BOTTOMLEFT", "BOTTOMRIGHT". * * @param picWidth, picHeight: picture width & height * * @param xPading, yPading: the distance of the original picture. * * <pre> The interface is only used for setting picture(logo) water-mark when publishing stream, with "*.png" format </pre> * * @return {0} if successful */ public native int SmartPublisherSetPictureWatermark(long handle, String picPath, int waterPostion, int picWidth, int picHeight, int xPading, int yPading);
如何通过RTMP或RTSP协议发送屏幕数据
RTMP或RTSP方案，有很多开源的选择，不过大多是demo级，如果产品化，自（填）研（坑）需要很大的精力，以下以大牛直播SDK为例，介绍下如何对接数据，好多开发者提到，为什么大牛直播SDK的Android平台RTMP推送接口怎么这么多？不像一些开源或者商业RTMP推送一样，就几个接口，简单明了。废话不多说，感兴趣的可以参考下 Github：
1. 初始化Publisher接口，返回推送实例句柄：
/** * Open publisher(启动推送实例) * * @param ctx: get by this.getApplicationContext() * * @param audio_opt: * if 0: 不推送音频 * if 1: 推送编码前音频(PCM) * if 2: 推送编码后音频(aac/pcma/pcmu/speex). * * @param video_opt: * if 0: 不推送视频 * if 1: 推送编码前视频(YUV420SP/YUV420P/RGBA/ARGB) * if 2: 推送编码后视频(H.264) * * @param width: capture width; height: capture height. * * <pre>This function must be called firstly.</pre> * * @return the handle of publisher instance */ public native long SmartPublisherOpen(Object ctx, int audio_opt, int video_opt, int width, int height);
2. 相关Event事件回调，如网络状态、实时快照、录像状态等回调：
/** * Set callback event(设置事件回调) * * @param callbackv2: callback function * * @return {0} if successful */ public native int SetSmartPublisherEventCallbackV2(long handle, NTSmartEventCallbackV2 callbackv2);
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 publisher_event = ""; switch (id) { case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_STARTED: publisher_event = "开始.."; break; case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_CONNECTING: publisher_event = "连接中.."; break; case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_CONNECTION_FAILED: publisher_event = "连接失败.."; break; case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_CONNECTED: publisher_event = "连接成功.."; break; case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_DISCONNECTED: publisher_event = "连接断开.."; break; case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_STOP: publisher_event = "关闭.."; break; case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_RECORDER_START_NEW_FILE: publisher_event = "开始一个新的录像文件 : " + param3; break; case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_ONE_RECORDER_FILE_FINISHED: publisher_event = "已生成一个录像文件 : " + param3; break; case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_SEND_DELAY: publisher_event = "发送时延: " + param1 + " 帧数:" + param2; break; case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_CAPTURE_IMAGE: publisher_event = "快照: " + param1 + " 路径：" + param3; if (param1 == 0) { publisher_event = publisher_event + "截取快照成功.."; } else { publisher_event = publisher_event + "截取快照失败.."; } break; case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_RTSP_URL: publisher_event = "RTSP服务URL: " + param3; break; case NTSmartEventID.EVENT_DANIULIVE_ERC_PUSH_RTSP_SERVER_RESPONSE_STATUS_CODE: publisher_event ="RTSP status code received, codeID: " + param1 + ", RTSP URL: " + param3; break; case NTSmartEventID.EVENT_DANIULIVE_ERC_PUSH_RTSP_SERVER_NOT_SUPPORT: publisher_event ="服务器不支持RTSP推送, 推送的RTSP URL: " + param3; break; } String str = "当前回调状态：" + publisher_event; Log.i(TAG, str); Message message = new Message(); message.what = PUBLISHER_EVENT_MSG; message.obj = publisher_event; handler.sendMessage(message); } }
3. 检测/设置软硬编码：
/** * Set Video H.264 HW Encoder, if support HW encoder, it will return 0(设置H.264硬编码) * * @param kbps: the kbps of different resolution(25 fps). * * @return {0} if successful */ public native int SetSmartPublisherVideoHWEncoder(long handle, int kbps); /** * Set Video H.265(hevc) hardware encoder, if support H.265(hevc) hardware encoder, it will return 0(设置H.265硬编码) * * @param kbps: the kbps of different resolution(25 fps). * * @return {0} if successful */ public native int SetSmartPublisherVideoHevcHWEncoder(long handle, int kbps);
4. 设置文字水印、PNG图片水印：
/** * Set Text water-mark(设置文字水印) * * @param fontSize: it should be "MEDIUM", "SMALL", "BIG" * * @param waterPostion: it should be "TOPLEFT", "TOPRIGHT", "BOTTOMLEFT", "BOTTOMRIGHT". * * @param xPading, yPading: the distance of the original picture. * * <pre> The interface is only used for setting font water-mark when publishing stream. </pre> * * @return {0} if successful */ public native int SmartPublisherSetTextWatermark(long handle, String waterText, int isAppendTime, int fontSize, int waterPostion, int xPading, int yPading); /** * Set Text water-mark font file name(设置文字水印字体路径) * * @param fontFileName: font full file name, e.g: /system/fonts/DroidSansFallback.ttf * * @return {0} if successful */ public native int SmartPublisherSetTextWatermarkFontFileName(long handle, String fontFileName); /** * Set picture water-mark(设置png图片水印) * * @param picPath: the picture working path, e.g: /sdcard/logo.png * * @param waterPostion: it should be "TOPLEFT", "TOPRIGHT", "BOTTOMLEFT", "BOTTOMRIGHT". * * @param picWidth, picHeight: picture width & height * * @param xPading, yPading: the distance of the original picture. * * <pre> The interface is only used for setting picture(logo) water-mark when publishing stream, with "*.png" format </pre> * * @return {0} if successful */ public native int SmartPublisherSetPictureWatermark(long handle, String picPath, int waterPostion, int picWidth, int picHeight, int xPading, int yPading);
5. 软编码可变码率设置（如摄像头采集编码，在设备性能允许的情况下，可以考虑软编码可变码率）：
/** * Set software encode vbr mode(软编码可变码率). * * <pre>please set before SmartPublisherStart while after SmartPublisherOpen.</pre> * * is_enable_vbr: if 0: NOT enable vbr mode, 1: enable vbr * * video_quality: vbr video quality, range with (1,50), default 23 * * vbr_max_kbitrate: vbr max encode bit-rate(kbps) * * @return {0} if successful */ public native int SmartPublisherSetSwVBRMode(long handle, int is_enable_vbr, int video_quality, int vbr_max_kbitrate);
6. 帧率、软编码码率、关键帧间隔，编码速度、软编码profile等基础设定：
/** * Set gop interval(设置I帧间隔) * * <pre>please set before SmartPublisherStart while after SmartPublisherOpen.</pre> * * gopInterval: encode I frame interval, the value always > 0 * * @return {0} if successful */ public native int SmartPublisherSetGopInterval(long handle, int gopInterval); /** * Set software encode video bit-rate(设置视频软编码bit-rate) * * <pre>please set before SmartPublisherStart while after SmartPublisherOpen.</pre> * * avgBitRate: average encode bit-rate(kbps) * * maxBitRate: max encode bit-rate(kbps) * * @return {0} if successful */ public native int SmartPublisherSetSWVideoBitRate(long handle, int avgBitRate, int maxBitRate); /** * Set fps(设置帧率) * * <pre>please set before SmartPublisherStart while after SmartPublisherOpen.</pre> * * fps: the fps of video, range with (1,25). * * @return {0} if successful */ public native int SmartPublisherSetFPS(long handle, int fps); /** * Set software video encoder profile(设置视频编码profile). * * <pre>please set before SmartPublisherStart while after SmartPublisherOpen.</pre> * * profile: the software video encoder profile, range with (1,3). * * 1: baseline profile * 2: main profile * 3: high profile * * @return {0} if successful */ public native int SmartPublisherSetSWVideoEncoderProfile(long handle, int profile); /** * Set software video encoder speed(设置视频软编码编码速度) * * <pre>please set before SmartPublisherStart while after SmartPublisherOpen.</pre> * * @param speed: range with(1, 6), the default speed is 6. * * if with 1, CPU is lowest. * if with 6, CPU is highest. * * @return {0} if successful */ public native int SmartPublisherSetSWVideoEncoderSpeed(long handle, int speed);
7. 设置audio编码类型，如AAC编码、Speex编码，并设置如AAC编码码率等参数：
/** * Set audio encoder type(设置音频编码类型) * * @param type: if with 1:AAC, if with 2: SPEEX * * @return {0} if successful */ public native int SmartPublisherSetAudioCodecType(long handle, int type); /** * Set audio encoder bit-rate(设置音频编码码率), 当前只对AAC编码有效 * * @param kbit_rate: 码率(单位是kbps), 如果是0的话将使用默认码率, 必须大于等于0 * * @return {0} if successful */ public native int SmartPublisherSetAudioBitRate(long handle, int kbit_rate); /** * Set speex encoder quality(设置speex编码质量) * * @param quality: range with (0, 10), default value is 8 * * @return {0} if successful */ public native int SmartPublisherSetSpeexEncoderQuality(long handle, int quality);
8. 音频处理，如自动增益控制、噪音抑制：
/** * Set Audio Noise Suppression(设置音频噪音抑制) * * @param isNS: if with 1:suppress, if with 0: does not suppress * * @return {0} if successful */ public native int SmartPublisherSetNoiseSuppression(long handle, int isNS); /** * Set Audio AGC(设置音频自动增益控制) * * @param isAGC: if with 1:AGC, if with 0: does not AGC * * @return {0} if successful */ public native int SmartPublisherSetAGC(long handle, int isAGC);
9. 音频混音接口设置：
/** * 设置混音,目前支持两路音频混音 * * @param is_mix: 1混音, 0不混音, 默认不混音 * * @return {0} if successful */ public native int SmartPublisherSetAudioMix(long handle, int is_mix);
10. 实时静音设置：
/** * Set mute or not during publish stream(设置实时静音) * * @param isMute: if with 1:mute, if with 0: does not mute * * @return {0} if successful */ public native int SmartPublisherSetMute(long handle, int isMute);
11. 音量调整：
/** * 设置输入音量, 这个接口一般不建议调用, 在一些特殊情况下可能会用, 一般不建议放大音量 * * @param index: 一般是0和1, 如果没有混音的只用0, 有混音的话, 0,1分别设置音量 * * @param volume: 音量，默认是1.0，范围是[0.0, 5.0], 设置成0静音, 1音量不变 * * @return {0} if successful */ public native int SmartPublisherSetInputAudioVolume(long handle, int index, float volume);
12. 前置摄像头镜像：
/** * Set mirror(设置前置摄像头镜像) * * @param isMirror: if with 1:mirror mode, if with 0: normal mode * * Please note when with "mirror mode", the publisher and player with the same echo direction * * @return {0} if successful */ public native int SmartPublisherSetMirror(long handle, int isMirror);
13. 录像相关配置，如只录制音频或视频，单个文件最大size，录像存放目录，开始/暂停/停止录像：
/** * 音频录制开关, 目的是为了更细粒度的去控制录像, 一般不需要调用这个接口, 这个接口使用场景比如同时推送音视频，但只想录制视频，可以调用这个接口关闭音频录制 * * @param is_recoder: 0: do not recorder; 1: recorder; sdk默认是1 * * @return {0} if successful */ public native int SmartPublisherSetRecorderAudio(long handle, int is_recoder); /** * 视频录制开关, 目的是为了更细粒度的去控制录像, 一般不需要调用这个接口, 这个接口使用场景比如同时推送音视频，但只想录制音频，可以调用这个接口关闭视频录制 * * @param is_recoder: 0: do not recorder; 1: recorder; sdk默认是1 * * @return {0} if successful */ public native int SmartPublisherSetRecorderVideo(long handle, int is_recoder); /** * Create file directory(创建录像存放目录) * * @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 SmartPublisherCreateFileDirectory(String path); /** * Set recorder directory(设置录像存放目录) * * @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 SmartPublisherSetRecorderDirectory(long handle, String path); /** * Set the size of every recorded file(设置单个录像文件大小，如超过最大文件大小，自动切换到下个文件录制) * * @param size: (MB), (5M~500M), if not in this range, set default size with 200MB. * * @return {0} if successful */ public native int SmartPublisherSetRecorderFileMaxSize(long handle, int size); /** * Start recorder(开始录像) * * @return {0} if successful */ public native int SmartPublisherStartRecorder(long handle); /** * Pause recorder(暂停/恢复录像) * * is_pause: 1表示暂停, 0表示恢复录像, 输入其他值将调用失败 * * @return {0} if successful */ public native int SmartPublisherPauseRecorder(long handle, int is_pause); /** * Stop recorder(停止录像) * * @return {0} if successful */ public native int SmartPublisherStopRecorder(long handle);
14. 实时快照：
/** * Set if needs to save image during publishing stream(设置是否启用快照) * * @param is_save_image: if with 1, it will save current image via the interface of SmartPlayerSaveImage(), if with 0: does not it * * @return {0} if successful */ public native int SmartPublisherSaveImageFlag(long handle, int is_save_image); /** * Save current image during publishing stream(实时快照) * * @param imageName: image name, which including fully path, "/sdcard/daniuliveimage/daniu.png", etc. * * @return {0} if successful */ public native int SmartPublisherSaveCurImage(long handle, String imageName);
15. 设置推送的RTMP URL：
/** * Set rtmp publish stream url(设置推送的RTMP url) * * @param url: rtmp publish url. * * @return {0} if successful */ public native int SmartPublisherSetURL(long handle, String url);
16. Android摄像头前后camera通过OnPreviewFrame()回调的数据接口：
@Override public void onPreviewFrame(byte[] data, Camera camera) { frameCount++; if (frameCount % 3000 == 0) { Log.i("OnPre", "gc+"); System.gc(); Log.i("OnPre", "gc-"); } if (data == null) { Parameters params = camera.getParameters(); Size size = params.getPreviewSize(); int bufferSize = (((size.width | 0x1f) + 1) * size.height * ImageFormat.getBitsPerPixel(params.getPreviewFormat())) / 8; camera.addCallbackBuffer(new byte[bufferSize]); } else { if (isRTSPPublisherRunning || isPushingRtmp || isRecording || isPushingRtsp) { libPublisher.SmartPublisherOnCaptureVideoData(publisherHandle, data, data.length, currentCameraType, currentOrigentation); } camera.addCallbackBuffer(data); } }
对应接口定义：
/** * Set live video data(no encoded data). * * @param cameraType: CAMERA_FACING_BACK with 0, CAMERA_FACING_FRONT with 1 * * @param curOrg: * PORTRAIT = 1; //竖屏 * LANDSCAPE = 2; //横屏 home键在右边的情况 * LANDSCAPE_LEFT_HOME_KEY = 3; //横屏 home键在左边的情况 * * @return {0} if successful */ public native int SmartPublisherOnCaptureVideoData(long handle, byte[] data, int len, int cameraType, int curOrg);
17. 部分定制设备，只支持YV12的数据：
/** * YV12数据接口 * * @param data: YV12 data * * @param width: 图像宽 * * @param height: 图像高 * * @param y_stride: y面步长 * * @param v_stride: v面步长 * * @param u_stride: u面步长 * * rotation_degree: 顺时针旋转, 必须是0, 90, 180, 270 * * @return {0} if successful */ public native int SmartPublisherOnYV12Data(long handle, byte[] data, int width, int height, int y_stride, int v_stride, int u_stride, int rotation_degree);
18. 支持NV21数据接口：
nv21数据接口，除了用于常规的camera数据接入外，部分定制摄像头出来的数据发生翻转，这个接口也支持。
/** * NV21数据接口 * * @param data: nv21 data * * @param len: data length * * @param width: 图像宽 * * @param height: 图像高 * * @param y_stride: y面步长 * * @param uv_stride: uv面步长 * * rotation_degree: 顺时针旋转, 必须是0, 90, 180, 270 * * @return {0} if successful */ public native int SmartPublisherOnNV21Data(long handle, byte[] data, int len, int width, int height, int y_stride, int uv_stride, int rotation_degree); /** * NV21数据接口 * * @param data: nv21 data * * @param len: data length * * @param width: 图像宽 * * @param height: 图像高 * * @param y_stride: y面步长 * * @param uv_stride: uv面步长 * * rotation_degree: 顺时针旋转, 必须是0, 90, 180, 270 * * @param is_vertical_flip: 是否垂直翻转, 0不翻转, 1翻转 * * @param is_horizontal_flip：是否水平翻转, 0不翻转, 1翻转 * * @return {0} if successful */ public native int SmartPublisherOnNV21DataV2(long handle, byte[] data, int len, int width, int height, int y_stride, int uv_stride, int rotation_degree, int is_vertical_flip, int is_horizontal_flip);
19. 支持YUV数据接入：
/** * Set live video data(no encoded data). * * @param data: I420 data * * @param len: I420 data length * * @param yStride: y stride * * @param uStride: u stride * * @param vStride: v stride * * @return {0} if successful */ public native int SmartPublisherOnCaptureVideoI420Data(long handle, byte[] data, int len, int yStride, int uStride, int vStride);
20. 支持RGBA数据接入（支持裁剪后数据接入，主要用于同屏场景）：
/** * Set live video data(no encoded data). * * @param data: RGBA data * * @param rowStride: stride information * * @param width: width * * @param height: height * * @return {0} if successful */ public native int SmartPublisherOnCaptureVideoRGBAData(long handle, ByteBuffer data, int rowStride, int width, int height); /** * 投递裁剪过的RGBA数据 * * @param data: RGBA data * * @param rowStride: stride information * * @param width: width * * @param height: height * * @param clipedLeft: 左; clipedTop: 上; clipedwidth: 裁剪后的宽; clipedHeight: 裁剪后的高; 确保传下去裁剪后的宽、高均为偶数 * * @return {0} if successful */ public native int SmartPublisherOnCaptureVideoClipedRGBAData(long handle, ByteBuffer data, int rowStride, int width, int height, int clipedLeft, int clipedTop, int clipedWidth, int clipedHeight); /** * Set live video data(no encoded data). * * @param data: ABGR flip vertical(垂直翻转) data * * @param rowStride: stride information * * @param width: width * * @param height: height * * @return {0} if successful */ public native int SmartPublisherOnCaptureVideoABGRFlipVerticalData(long handle, ByteBuffer data, int rowStride, int width, int height);
21. 支持RGB565数据接入（主要用于同屏场景）：
/** * Set live video data(no encoded data). * * @param data: RGB565 data * * @param row_stride: stride information * * @param width: width * * @param height: height * * @return {0} if successful */ public native int SmartPublisherOnCaptureVideoRGB565Data(long handle,ByteBuffer data, int row_stride, int width, int height);
22. 支持camera数据接入（主要用于camera2接口对接）：
/* * 专门为android.media.Image的android.graphics.ImageFormat.YUV_420_888格式提供的接口 * * @param width: 必须是8的倍数 * * @param height: 必须是8的倍数 * * @param crop_left: 剪切左上角水平坐标, 一般根据android.media.Image.getCropRect() 填充 * * @param crop_top: 剪切左上角垂直坐标, 一般根据android.media.Image.getCropRect() 填充 * * @param crop_width: 必须是8的倍数, 填0将忽略这个参数, 一般根据android.media.Image.getCropRect() 填充 * * @param crop_height: 必须是8的倍数, 填0将忽略这个参数，一般根据android.media.Image.getCropRect() 填充 * * @param y_plane 对应android.media.Image.Plane[0].getBuffer() * * @param y_row_stride 对应android.media.Image.Plane[0].getRowStride() * * @param u_plane 对应android.media.Image.Plane[1].getBuffer() * * @param v_plane 对应android.media.Image.Plane[2].getBuffer() * * @param uv_row_stride 对应android.media.Image.Plane[1].getRowStride() * * @param uv_pixel_stride 对应android.media.Image.Plane[1].getPixelStride() * * @param rotation_degree: 顺时针旋转, 必须是0, 90, 180, 270 * * @param is_vertical_flip: 是否垂直翻转, 0不翻转, 1翻转 * * @param is_horizontal_flip：是否水平翻转, 0不翻转, 1翻转 * * @param scale_width: 缩放宽，必须是8的倍数, 0不缩放 * * @param scale_height: 缩放高, 必须是8的倍数, 0不缩放 * * @param scale_filter_mode: 缩放质量, 范围必须是[1,3], 传0使用默认速度 * * @return {0} if successful */ public native int SmartPublisherOnImageYUV420888(long handle, int width, int height, int crop_left, int crop_top, int crop_width, int crop_height, ByteBuffer y_plane, int y_row_stride, ByteBuffer u_plane, ByteBuffer v_plane, int uv_row_stride, int uv_pixel_stride, int rotation_degree, int is_vertical_flip, int is_horizontal_flip, int scale_width, int scale_height, int scale_filter_mode);
23. 支持PCM数据接入：
/** * 传递PCM音频数据给SDK, 每10ms音频数据传入一次 * * @param pcmdata: pcm数据, 需要使用ByteBuffer.allocateDirect分配, ByteBuffer.isDirect()是true的才行. * @param size: pcm数据大小 * @param sample_rate: 采样率，当前只支持{44100, 8000, 16000, 24000, 32000, 48000}, 推荐44100 * @param channel: 通道, 当前通道支持单通道(1)和双通道(2)，推荐单通道(1) * @param per_channel_sample_number: 这个请传入的是 sample_rate/100 */ public native int SmartPublisherOnPCMData(long handle, ByteBuffer pcmdata, int size, int sample_rate, int channel, int per_channel_sample_number); /** * 传递PCM音频数据给SDK, 每10ms音频数据传入一次 * * @param pcmdata: pcm数据, 需要使用ByteBuffer.allocateDirect分配, ByteBuffer.isDirect()是true的才行. * @param offset: pcmdata的偏移 * @param size: pcm数据大小 * @param sample_rate: 采样率，当前只支持{44100, 8000, 16000, 24000, 32000, 48000}, 推荐44100 * @param channel: 通道, 当前通道支持单通道(1)和双通道(2)，推荐单通道(1) * @param per_channel_sample_number: 这个请传入的是 sample_rate/100 */ public native int SmartPublisherOnPCMDataV2(long handle, ByteBuffer pcmdata, int offset, int size, int sample_rate, int channel, int per_channel_sample_number); /** * 传递PCM音频数据给SDK, 每10ms音频数据传入一次 * * @param pcm_short_array: pcm数据, short是native endian order * @param offset: 数组偏移 * @param len: 数组项数 * @param sample_rate: 采样率，当前只支持{44100, 8000, 16000, 24000, 32000, 48000}, 推荐44100 * @param channel: 通道, 当前通道支持单通道(1)和双通道(2)，推荐单通道(1) * @param per_channel_sample_number: 这个请传入的是 sample_rate/100 */ public native int SmartPublisherOnPCMShortArray(long handle, short[] pcm_short_array, int offset, int len, int sample_rate, int channel, int per_channel_sample_number);
24. 支持远端PCM数据接入和混音后PCM数据接入（主要用于一对一互动）：
/** * Set far end pcm data * * @param pcmdata : 16bit pcm data * @param sampleRate: audio sample rate * @param channel: auido channel * @param per_channel_sample_number: per channel sample numbers * @param is_low_latency: if with 0, it is not low_latency, if with 1, it is low_latency * @return {0} if successful */ public native int SmartPublisherOnFarEndPCMData(long handle, ByteBuffer pcmdata, int sampleRate, int channel, int per_channel_sample_number, int is_low_latency); /** * 传递PCM混音音频数据给SDK, 每10ms音频数据传入一次 * * @param stream_index: 当前只能传1, 传其他返回错误 * @param pcm_data: pcm数据, 需要使用ByteBuffer.allocateDirect分配, ByteBuffer.isDirect()是true的才行. * @param offset: pcmdata的偏移 * @param size: pcm数据大小 * @param sample_rate: 采样率，当前只支持{44100, 8000, 16000, 24000, 32000, 48000} * @param channels: 通道, 当前通道支持单通道(1)和双通道(2) * @param per_channel_sample_number: 这个请传入的是 sample_rate/100 */ public native int SmartPublisherOnMixPCMData(long handle, int stream_index, ByteBuffer pcm_data, int offset, int size, int sample_rate, int channels, int per_channel_sample_number); /** * 传递PCM混音音频数据给SDK, 每10ms音频数据传入一次 * * @param stream_index: 当前只能传1, 传其他返回错误 * @param pcm_short_array: pcm数据, short是native endian order * @param offset: 数组偏移 * @param len: 数组项数 * @param sample_rate: 采样率，当前只支持{44100, 8000, 16000, 24000, 32000, 48000} * @param channels: 通道, 当前通道支持单通道(1)和双通道(2) * @param per_channel_sample_number: 这个请传入的是 sample_rate/100 */ public native int SmartPublisherOnMixPCMShortArray(long handle, int stream_index, short[] pcm_short_array, int offset, int len, int sample_rate, int channels, int per_channel_sample_number);
25. H264扩展SEI消息：
/** * 设置发送队列大小，为保证实时性，默认大小为3, 必须设置一个大于0的数 * * @param max_size: 队列最大长度 * * @param reserve: 保留字段 * * NOTE: 1. 如果数据超过队列大小，将丢掉队头数据; 2. 这个接口请在 StartPublisher 之前调用 * * @return {0} if successful */ public native int SmartPublisherSetPostUserDataQueueMaxSize(long handle, int max_size, int reserve); /** * 清空用户数据队列, 有些情况可能会用到，比如发送队列里面有4条消息再等待发送,又想把最新的消息快速发出去, 可以先清除掉正在排队消息, 再调用PostUserXXX * * @return {0} if successful */ public native int SmartPublisherClearPostUserDataQueue(long handle); /** * 发送二进制数据 * * NOTE: * 1.目前数据大小限制在256个字节以内，太大可能会影响视频传输，如果有特殊需求，需要增大限制，请联系我们 * 2. 如果积累的数据超过了设置的队列大小，之前的队头数据将被丢弃 * 3. 必须再调用StartPublisher之后再发送数据 * * @param data: 二进制数据 * * @param size: 数据大小 * * @param reserve: 保留字段 * * @return {0} if successful */ public native int SmartPublisherPostUserData(long handle, byte[] data, int size, int reserve); /** * 发送utf8字符串 * * NOTE: * 1. 字符串长度不能超过256, 太大可能会影响视频传输，如果有特殊需求，需要增大限制，请联系我们 * 2. 如果积累的数据超过了设置的队列大小，之前的队头数据将被丢弃 * 3. 必须再调用StartPublisher之后再发送数据 * * @param utf8_str: utf8字符串 * * @param reserve: 保留字段 * * @return {0} if successful */ public native int SmartPublisherPostUserUTF8StringData(long handle, String utf8_str, int reserve);
26. 关闭推送实例：
/** * 关闭推送实例，结束时必须调用close接口释放资源 * * @return {0} if successful */ public native int SmartPublisherClose(long handle);
