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[英]What is MediaCodec, MediaExtractor and MediaMuxer in android?
[英]getInpuBuffer in Android MediaCodec and MediaMuxer
以下是Android MediaMuxer API示例代码的片段: https : //developer.android.com/reference/android/media/MediaMuxer.html
MediaMuxer muxer = new MediaMuxer("temp.mp4", OutputFormat.MUXER_OUTPUT_MPEG_4);
// More often, the MediaFormat will be retrieved from MediaCodec.getOutputFormat()
// or MediaExtractor.getTrackFormat().
MediaFormat audioFormat = new MediaFormat(...);
MediaFormat videoFormat = new MediaFormat(...);
int audioTrackIndex = muxer.addTrack(audioFormat);
int videoTrackIndex = muxer.addTrack(videoFormat);
ByteBuffer inputBuffer = ByteBuffer.allocate(bufferSize);
boolean finished = false;
BufferInfo bufferInfo = new BufferInfo();
muxer.start();
while(!finished) {
// getInputBuffer() will fill the inputBuffer with one frame of encoded
// sample from either MediaCodec or MediaExtractor, set isAudioSample to
// true when the sample is audio data, set up all the fields of bufferInfo,
// and return true if there are no more samples.
finished = getInputBuffer(inputBuffer, isAudioSample, bufferInfo);
if (!finished) {
int currentTrackIndex = isAudioSample ? audioTrackIndex : videoTrackIndex;
muxer.writeSampleData(currentTrackIndex, inputBuffer, bufferInfo);
}
};
muxer.stop();
muxer.release();
对于这一行: finished = getInputBuffer(inputBuffer, isAudioSample, bufferInfo);
我没有在MediaCodec.java和MediaMuxer.java中找到这个函数getInputBuffer,是用户定义的函数还是API函数?
在这种情况下, getInputBuffer
是一个假设的用户定义函数。 它不是API函数。 上面的评论解释了它应该做什么。 (注意它实际上不会以它的编写方式工作,因为isAudioSample变量不能被函数以完全写入的方式更新。)
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