camera2 api -> mediaCodec -> mediaMuxer -> mp4 文件

Question

我正在尝试获取一个 mp4 文件。我使用 camera2 api 拍摄视频，并且可以使用 MediaCodec 将其保存为 avc 文件。但我不明白如何重做这段代码，以便使用 MediaMuxer 编码成 mp4 文件。对不起我的英语，这是通过翻译翻译的

private class EncoderCallback : MediaCodec.Callback() {

      override fun onInputBufferAvailable(codec: MediaCodec, index: Int) {
      }
      override fun onOutputBufferAvailable(
          codec: MediaCodec,
          index2: Int,
          info: MediaCodec.BufferInfo
      ) {
          outPutByteBuffer = mCodec!!.getOutputBuffer(index2)
          val outDate = ByteArray(info.size)
           outPutByteBuffer!![outDate]
          try {
              Log.i("EncoderCallBack", " outDate.length : " + outDate.size)

              outputStream!!.write(outDate, 0, outDate.size) 
          } catch (e: IOException) {
              e.printStackTrace()
          }
          mCodec!!.releaseOutputBuffer(index2, false)
      }

      override fun onError(codec: MediaCodec, e: MediaCodec.CodecException) {
          Log.i("EncoderCallBack", "Error: $e")
      }

      override fun onOutputFormatChanged(codec: MediaCodec, format: MediaFormat) {
          Log.i("EncoderCallBack", "encoder output format changed: $format")
      }

  }

初始化MediaCodec后，我录制视频：

var texture: SurfaceTexture = textureViewOver
        texture.setDefaultBufferSize(320, 240)
     surface = Surface(texture)   
builder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW)
          builder.addTarget(surface)
          builder.addTarget(mEncoderSurface!!)

          mCameraDevice.createCaptureSession(
              mutableListOf(surface, mEncoderSurface),
              object : CameraCaptureSession.StateCallback() {...

Answer 1

缺少复用器代码：

 override fun onOutputBufferAvailable(
      codec: MediaCodec,
      index2: Int,
      info: MediaCodec.BufferInfo
  ) {
      outPutByteBuffer = mCodec!!.getOutputBuffer(index2)
      mediaMuxer?.writeSampleData(trackIndex, outPutByteBuffer, info)
      mCodec!!.releaseOutputBuffer(index2, false)
  }