很多开发者在做Android平台RTMP推流或轻量级RTSP服务(摄像头或同屏)时,总感觉接口不够用,以大牛直播SDK为例 (Github) 我们来总结下,我们常规需要支持的编码前音视频数据有哪些类型:

1. 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);

2. 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);

3. 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);

4. 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);


5. 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);

6. 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);

7. 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);

8. 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);

9. 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);

总结:

以上只是编码前数据接口,一个产品如果想做的足够通用,需要对接的太多了,你觉得呢?

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