私はffmpegを使いたくありません。現在、m4a オーディオと mp4 ビデオを多重化できました。mp3からm4aへの変換が必要なmp3オーディオも追加したいと思います。以下のコードでwavをm4aに変換できましたが、mp3をm4aに変換できませんでした
これが私のコードです。
private void convertAudio(String filename) throws IOException {
String outputpath =Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC).getPath()+"/converted.m4a";
// Set up MediaExtractor to read from the source.
MediaExtractor extractor = new MediaExtractor();
extractor.setDataSource(filename);
int trackCount = extractor.getTrackCount();
// Set up MediaMuxer for the destination.
MediaMuxer muxer;
muxer = new MediaMuxer(outputpath, MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4);
// Set up the tracks.
HashMap<Integer, Integer> indexMap = new HashMap<Integer, Integer>(trackCount);
for (int i = 0; i < trackCount; i++) {
extractor.selectTrack(i);
MediaFormat format = extractor.getTrackFormat(i);
format.setString(MediaFormat.KEY_MIME, MediaFormat.MIMETYPE_AUDIO_AMR_NB);
int dstIndex = muxer.addTrack(format);
indexMap.put(i, dstIndex);
}
// Copy the samples from MediaExtractor to MediaMuxer.
boolean sawEOS = false;
int bufferSize = 32000;
int frameCount = 0;
int offset = 100;
ByteBuffer dstBuf = ByteBuffer.allocate(bufferSize);
MediaCodec.BufferInfo bufferInfo = new MediaCodec.BufferInfo();
/* if (degrees >= 0) {
muxer.setOrientationHint(degrees);
}*/
// Test setLocation out of bound cases
muxer.start();
while (!sawEOS) {
bufferInfo.offset = offset;
bufferInfo.size = extractor.readSampleData(dstBuf, offset);
if (bufferInfo.size < 0) {
sawEOS = true;
bufferInfo.size = 0;
} else {
bufferInfo.presentationTimeUs = extractor.getSampleTime();
bufferInfo.flags = extractor.getSampleFlags();
int trackIndex = extractor.getSampleTrackIndex();
muxer.writeSampleData(indexMap.get(trackIndex), dstBuf,
bufferInfo);
extractor.advance();
frameCount++;
}
}
muxer.stop();
muxer.release();
return;
}