EncoderDecoderTestForMJPEG

Purpose

This is a test application for JPEG/M-JPEG throug MediaCodec. This could also be a good tutorial of how to using MediaCodec API on Android.

Requisites

Before testing, you should put input frames in the external storage of your target.

• For Encoder Test, put 10 YUV frames at /storage/sdcard0/video.YUY2_<frame_index>.
• For Decoder Test, put 10 JPEG pictures at /storage/sdcard0/video.jpeg_<jpeg_index>.

How to build, how to use

This was written as if it were a CTS test, but is not part of CTS.It should be straightforward to adapt the code to other environments.

1 . Place the code

You can put the src under cts directory of the whole android project. It looks Like:

<your-android-proj-root>/cts/tests/tests/media/src/android/media/cts/EncoderDecoderTestForMJPEG.java

2 . Build the code

Just build the whole cts test target, EncoderDecoderTestForMJPEG.java will be included in the cts target automatically.

make cts -j4

3 . How to run the test

Just like any other cts test cases, follow command:

run cts -c android.media.cts.EncoderDecoderTestForMJPEG -m <your-testing-method>

4. Test result

You will see a PASS if the test complete successfully. And 10 output frames in the same directory where you keep testing input.

• For Encoder Test, since your input is like video.YUY2_<frame_index> so you will get video.jpeg_<jpeg_index>.
• For Decoder Test, since your input is like video.jpeg_<jpeg_index> so you will get video.YUY2_<frame_index>.

Current Status

• The JPEG encoder can encoder one frame successfully.
• Add test plans for different resolutions. @20150804
• Change to feed 10 input buffers continuously, in this way, we can get multiple output buffers. @20150804

Working in progress

1 . Fix infinite looping issue of JPEG encoder.

2 . Add decoder test.

3 . Fix the info.flags that can't got EOS flags from output BufferInfo.

4 . Fix run-time warnings.

5 . Code revise needed.

6 . Should handle Java FileOutputStream/FileInputStream nicely.