public void startPlayback()

in BasicMediaDecoder/Application/src/main/java/com/example/android/basicmediadecoder/MainActivity.java [97:188]
48 lines of code
10 McCabe index (conditional complexity)

    public void startPlayback() {

        // Construct a URI that points to the video resource that we want to play
        Uri videoUri = Uri.parse("android.resource://"
                + getPackageName() + "/"
                + R.raw.vid_bigbuckbunny);

        try {

            // BEGIN_INCLUDE(initialize_extractor)
            mExtractor.setDataSource(this, videoUri, null);
            int nTracks = mExtractor.getTrackCount();

            // Begin by unselecting all of the tracks in the extractor, so we won't see
            // any tracks that we haven't explicitly selected.
            for (int i = 0; i < nTracks; ++i) {
                mExtractor.unselectTrack(i);
            }


            // Find the first video track in the stream. In a real-world application
            // it's possible that the stream would contain multiple tracks, but this
            // sample assumes that we just want to play the first one.
            for (int i = 0; i < nTracks; ++i) {
                // Try to create a video codec for this track. This call will return null if the
                // track is not a video track, or not a recognized video format. Once it returns
                // a valid MediaCodecWrapper, we can break out of the loop.
                mCodecWrapper = MediaCodecWrapper.fromVideoFormat(mExtractor.getTrackFormat(i),
                        new Surface(mPlaybackView.getSurfaceTexture()));
                if (mCodecWrapper != null) {
                    mExtractor.selectTrack(i);
                    break;
                }
            }
            // END_INCLUDE(initialize_extractor)




            // By using a {@link TimeAnimator}, we can sync our media rendering commands with
            // the system display frame rendering. The animator ticks as the {@link Choreographer}
            // receives VSYNC events.
            mTimeAnimator.setTimeListener(new TimeAnimator.TimeListener() {
                @Override
                public void onTimeUpdate(final TimeAnimator animation,
                                         final long totalTime,
                                         final long deltaTime) {

                    boolean isEos = ((mExtractor.getSampleFlags() & MediaCodec
                            .BUFFER_FLAG_END_OF_STREAM) == MediaCodec.BUFFER_FLAG_END_OF_STREAM);

                    // BEGIN_INCLUDE(write_sample)
                    if (!isEos) {
                        // Try to submit the sample to the codec and if successful advance the
                        // extractor to the next available sample to read.
                        boolean result = mCodecWrapper.writeSample(mExtractor, false,
                                mExtractor.getSampleTime(), mExtractor.getSampleFlags());

                        if (result) {
                            // Advancing the extractor is a blocking operation and it MUST be
                            // executed outside the main thread in real applications.
                            mExtractor.advance();
                        }
                    }
                    // END_INCLUDE(write_sample)

                    // Examine the sample at the head of the queue to see if its ready to be
                    // rendered and is not zero sized End-of-Stream record.
                    MediaCodec.BufferInfo out_bufferInfo = new MediaCodec.BufferInfo();
                    mCodecWrapper.peekSample(out_bufferInfo);

                    // BEGIN_INCLUDE(render_sample)
                    if (out_bufferInfo.size <= 0 && isEos) {
                        mTimeAnimator.end();
                        mCodecWrapper.stopAndRelease();
                        mExtractor.release();
                    } else if (out_bufferInfo.presentationTimeUs / 1000 < totalTime) {
                        // Pop the sample off the queue and send it to {@link Surface}
                        mCodecWrapper.popSample(true);
                    }
                    // END_INCLUDE(render_sample)

                }
            });

            // We're all set. Kick off the animator to process buffers and render video frames as
            // they become available
            mTimeAnimator.start();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }