/**
* Edits a video file, saving the contents to a new file. This involves decoding and
* re-encoding, not to mention conversions between YUV and RGB, and so may be lossy.
* <p>
* If we recognize the decoded format we can do this in Java code using the ByteBuffer[]
* output, but it's not practical to support all OEM formats. By using a SurfaceTexture
* for output and a Surface for input, we can avoid issues with obscure formats and can
* use a fragment shader to do transformations.
*/
private VideoChunks editVideoFile(VideoChunks inputData)
{
if (AppSettings.Logging.SendToConsole)
{
Log.Debug(TAG, "editVideoFile " + mWidth + "x" + mHeight);
}
VideoChunks outputData = new VideoChunks();
MediaCodec decoder = null;
MediaCodec encoder = null;
InputSurface inputSurface = null;
OutputSurface outputSurface = null;
try {
MediaFormat inputFormat = inputData.getMediaFormat();
// Create an encoder format that matches the input format. (Might be able to just
// re-use the format used to generate the video, since we want it to be the same.)
MediaFormat outputFormat = MediaFormat.CreateVideoFormat(MIME_TYPE, mWidth, mHeight);
outputFormat.SetInteger(MediaFormat.KeyColorFormat, (int)MediaCodecInfo.CodecCapabilities.COLORFormatSurface);
outputFormat.SetInteger(MediaFormat.KeyBitRate, inputFormat.GetInteger(MediaFormat.KeyBitRate));
outputFormat.SetInteger(MediaFormat.KeyFrameRate, inputFormat.GetInteger(MediaFormat.KeyFrameRate));
outputFormat.SetInteger(MediaFormat.KeyIFrameInterval, inputFormat.GetInteger(MediaFormat.KeyIFrameInterval));
outputData.setMediaFormat(outputFormat);
encoder = MediaCodec.CreateEncoderByType(MIME_TYPE);
encoder.Configure(outputFormat, null, null, MediaCodecConfigFlags.Encode);
inputSurface = new InputSurface(encoder.CreateInputSurface());
inputSurface.MakeCurrent();
encoder.Start();
// OutputSurface uses the EGL context created by InputSurface.
decoder = MediaCodec.CreateDecoderByType(MIME_TYPE);
outputSurface = new OutputSurface();
outputSurface.ChangeFragmentShader(FRAGMENT_SHADER);
decoder.Configure(inputFormat, outputSurface.Surface, null, 0);
decoder.Start();
editVideoData(inputData, decoder, outputSurface, inputSurface, encoder, outputData);
} finally {
if (AppSettings.Logging.SendToConsole)
{
Log.Debug(TAG, "shutting down encoder, decoder");
}
if (outputSurface != null)
{
outputSurface.Release();
}
if (inputSurface != null)
{
inputSurface.Release();
}
if (encoder != null)
{
encoder.Stop();
encoder.Release();
}
if (decoder != null)
{
decoder.Stop();
decoder.Release();
}
}
return(outputData);
}
// For audio: http://stackoverflow.com/questions/22673011/how-to-extract-pcm-samples-from-mediacodec-decoders-output
private void EncodeCameraToMp4()
{
// arbitrary but popular values
try {
prepareMediaPlayer();
prepareEncoder();
_inputSurface.MakeCurrent();
prepareSurfaceTexture();
_mediaPlayer.Start();
var st = _outputSurface.SurfaceTexture;
int frameCount = 0;
var curShad = false;
bool isCompleted = false;
_mediaPlayer.Completion += (object sender, System.EventArgs e) =>
{
isCompleted = true;
};
while (!isCompleted)
{
// Feed any pending encoder output into the muxer.
drainEncoder(false);
if ((frameCount % _fps) == 0)
{
curShad = !curShad;
}
// We flash it between rgb and bgr to quickly demonstrate shading is working
if (curShad)
{
_outputSurface.ChangeFragmentShader(FRAGMENT_SHADER1);
}
else
{
_outputSurface.ChangeFragmentShader(FRAGMENT_SHADER2);
}
frameCount++;
// Acquire a new frame of input, and render it to the Surface. If we had a
// GLSurfaceView we could switch EGL contexts and call drawImage() a second
// time to render it on screen. The texture can be shared between contexts by
// passing the GLSurfaceView's EGLContext as eglCreateContext()'s share_context
// argument.
if (!_outputSurface.AwaitNewImage())
{
break;
}
_outputSurface.DrawImage();
// Set the presentation time stamp from the SurfaceTexture's time stamp. This
// will be used by MediaMuxer to set the PTS in the video.
_inputSurface.SetPresentationTime(st.Timestamp);
// Submit it to the encoder. The eglSwapBuffers call will block if the input
// is full, which would be bad if it stayed full until we dequeued an output
// buffer (which we can't do, since we're stuck here). So long as we fully drain
// the encoder before supplying additional input, the system guarantees that we
// can supply another frame without blocking.
if (VERBOSE)
{
Log.Debug(TAG, "sending frame to encoder");
}
_inputSurface.SwapBuffers();
}
// send end-of-stream to encoder, and drain remaining output
drainEncoder(true);
} finally {
// release everything we grabbed
releaseMediaPlayer();
releaseEncoder();
releaseSurfaceTexture();
}
}
private void encodeCameraToMpeg()
{
// arbitrary but popular values
int encWidth = 640;
int encHeight = 480;
int encBitRate = 6000000; // Mbps
Log.Debug(TAG, MIME_TYPE + " output " + encWidth + "x" + encHeight + " @" + encBitRate);
try {
prepareCamera(encWidth, encHeight);
prepareEncoder(encWidth, encHeight, encBitRate);
_inputSurface.MakeCurrent();
prepareSurfaceTexture();
_camera.StartPreview();
long startWhen = JavaSystem.NanoTime();
long desiredEnd = startWhen + DURATION_SEC * 1000000000L;
var st = _outputSurface.SurfaceTexture;
int frameCount = 0;
var curShad = false;
while (JavaSystem.NanoTime() < desiredEnd)
{
// Feed any pending encoder output into the muxer.
drainEncoder(false);
if ((frameCount % 24) == 0)
{
curShad = !curShad;
}
if (curShad)
{
_outputSurface.ChangeFragmentShader(FRAGMENT_SHADER1);
}
else
{
_outputSurface.ChangeFragmentShader(FRAGMENT_SHADER2);
}
frameCount++;
// Acquire a new frame of input, and render it to the Surface. If we had a
// GLSurfaceView we could switch EGL contexts and call drawImage() a second
// time to render it on screen. The texture can be shared between contexts by
// passing the GLSurfaceView's EGLContext as eglCreateContext()'s share_context
// argument.
_outputSurface.AwaitNewImage();
_outputSurface.DrawImage();
// Set the presentation time stamp from the SurfaceTexture's time stamp. This
// will be used by MediaMuxer to set the PTS in the video.
if (AppSettings.Logging.SendToConsole)
{
Log.Debug(TAG, "present: " +
((st.Timestamp - startWhen) / 1000000.0) + "ms");
}
_inputSurface.SetPresentationTime(st.Timestamp);
// Submit it to the encoder. The eglSwapBuffers call will block if the input
// is full, which would be bad if it stayed full until we dequeued an output
// buffer (which we can't do, since we're stuck here). So long as we fully drain
// the encoder before supplying additional input, the system guarantees that we
// can supply another frame without blocking.
if (AppSettings.Logging.SendToConsole)
{
Log.Debug(TAG, "sending frame to encoder");
}
_inputSurface.SwapBuffers();
}
// send end-of-stream to encoder, and drain remaining output
drainEncoder(true);
} finally {
// release everything we grabbed
releaseCamera();
releaseEncoder();
releaseSurfaceTexture();
}
}
