Android平台如何实现外部编码后(H.264/H.265)数据实时预览播放

    // SmartPlayerJniV2.java
    // Author: daniusdk.com
    /**
	 * 投递视频包给外部Live Source
	 *
	 * @param codec_id: 编码id, 当前仅支持H264和H265, 1:H264, 2:H265
	 *
	 * @param packet: 视频数据, ByteBuffer必须是DirectBuffer, 包格式请参考H264/H265 Annex B Byte stream format, 例如:
	 *                0x00000001 nal_unit 0x00000001 ...
	 *                H264 IDR: 0x00000001 sps 0x00000001 pps 0x00000001 IDR_nal_unit .... 或 0x00000001 IDR_nal_unit ....
	 *                H265 IDR: 0x00000001 vps 0x00000001 sps 0x00000001 pps 0x00000001 IDR_nal_unit .... 或 0x00000001 IDR_nal_unit ....
	 *
	 * @param offset: 偏移量
	 * @param size: packet size
	 * @param timestamp_ms: 时间戳, 单位毫秒
	 * @param is_timestamp_discontinuity: 是否时间戳间断，0:未间断，1:间断
	 * @param is_key: 是否是关键帧, 0:非关键帧, 1:关键帧
	 * @param extra_data: 可选参数，可传null, 对于H264关键帧包, 如果packet不含sps和pps, 可传0x00000001 sps 0x00000001 pps
	 *                    ,对于H265关键帧包, 如果packet不含vps,sps和pps, 可传0x00000001 vps 0x00000001 sps 0x00000001 pps
	 * @param extra_data_size: extra_data size
	 * @param width: 图像宽, 可传0
	 * @param height: 图像高, 可传0
	 *
	 * @return {0} if successful
	 */
	public native int PostVideoPacketByteBuffer(long handle, int codec_id,
									  java.nio.ByteBuffer packet, int offset, int size, long timestamp_ms, int is_timestamp_discontinuity, int is_key,
									  byte[] extra_data, int extra_data_size, int width, int height);


	/*
	* 请参考 PostVideoPacketByteBuffer说明
	 */
	public native int PostVideoPacketByteArray(long handle, int codec_id,
												byte[] packet, int offset, int size, long timestamp_ms, int is_timestamp_discontinuity, int is_key,
												byte[] extra_data, int extra_data_size, int width, int height);

public void onVideoDataCallback(int ret, int video_codec_id, int sample_size, int is_key_frame, long timestamp, int width, int height, long presentation_timestamp)
		{
			//Log.i("onVideoDataCallback", "ret: " + ret + ", video_codec_id: " + video_codec_id + ", sample_size: " + sample_size + ", is_key_frame: "+ is_key_frame +  ", timestamp: " + timestamp +
			//		",presentation_timestamp:" + presentation_timestamp);

			if ( video_buffer_ == null)
				return;

			video_buffer_.rewind();

			if (0 == ret && ex_live_src_player_handle_ !=0) {
				libPlayer.PostVideoPacketByteBuffer(ex_live_src_player_handle_, video_codec_id, video_buffer_, 0, sample_size, timestamp, 0, is_key_frame, null,0, 0, 0);
			}

		}

private long start_ex_live_src_player(SmartPlayerJniV2 lib_player, Context context, SurfaceView surface_view, boolean is_hardware_decoder) {
		if (null ==lib_player || null == context || null == surface_view)
			return 0;

		long handle = lib_player.SmartPlayerOpen(context);
		if (0 == handle) {
			Log.e(TAG, "start_ex_live_src_player open player failed");
			return 0;
		}

		// 设置0, 尽可能降低预览延时
		lib_player.SmartPlayerSetBuffer(handle, 0);

		lib_player.SmartPlayerSetUrl(handle, "ntexternal://livesource/implemention0");

		lib_player.SmartPlayerSetSurface(handle, surface_view);

		// 图像等比例缩放或铺满view
		lib_player.SmartPlayerSetRenderScaleMode(handle, 1);

		lib_player.SmartPlayerSetFastStartup(handle, 1);

		// 不要播放音频，静音就好
		lib_player.SmartPlayerSetMute(handle, 1);

		// 大分辨率可能需要硬解，小分辨率推荐软解，硬解延时可能大些
		if (is_hardware_decoder) {
			lib_player.SetSmartPlayerVideoHevcHWDecoder(handle, 1);
			lib_player.SetSmartPlayerVideoHWDecoder(handle, 1);
		}

		// 有些场景可能需要解码出来的图像用来做分析或重新编码
		// 这里可以设置yuv或rgb callback, 把图像给Caller
		// lib_player.SmartPlayerSetExternalRender(handle, new RGBAExternalRender());
		// lib_player.SmartPlayerSetExternalRender(handle, new I420ExternalRender());

		if (0 == lib_player.SmartPlayerStartPlay(handle))
			return handle;

		lib_player.SmartPlayerClose(handle);

		return 0;
	}

private void stop_ex_live_src_play(SmartPlayerJniV2 lib_player, long handle) {
		if (null == lib_player)
			return;

		if (0 == handle)
			return;

		lib_player.SmartPlayerStopPlay(handle);
		lib_player.SmartPlayerClose(handle);
	}