写在前面的话
好像刘亦菲的妹子 哇咔咔
这周重点 优化项目中的配音合成这一块。简单分享一下ffmpeg的一些使用命令吧。
ffmpeg基本使用参考
//音频资源转换格式
compile 'com.github.adrielcafe:AndroidAudioConverter:0.0.8'
//简单的音频合成
compile 'com.googlecode.mp4parser:isoparser:1.1.21'
ffmpeg 处理关键帧
播放一段压缩过的视频 发现mediaplayer无法seek to到精确位置
需要处理一下关键帧
<code>
public void getNewVideo(String input_file, String output_file, ExecuteBinaryResponseHandler responseHandler) {
try {
Runtime.getRuntime().gc();
String cmd = "-i " + input_file + " -c:v libx264 -preset superfast -x264opts keyint=20 -acodec copy -f mp4 " + output_file;
Log.d("打印出的字符串是", "getNewVideo: " + cmd);
String[] command = cmd.split(" ");
ffmpeg.execute(command, responseHandler);
} catch (Exception e) {
e.printStackTrace();
}
}
</code>
感觉速度有点慢 后台那边处理的话 造成文件比较打 至今没有发现什么更好的解决方案
转码
一般的转码 AndroidAudioConverter都能搞定.而且转码速度比较快
<code>
AndroidAudioConverter.with(mContext)
.setFile(new File("XXX"))
.setFormat(AudioFormat.AAC) //需要转码的格式
.setCallback(new IConvertCallback() {
@Override
public void onSuccess(File file) {
Log.d("转码~", "onSuccess:" + file.getPath());
}
@Override
public void onFailure(Exception e) {
Log.d("转码~", "onFailure:" + e.getMessage());
}
})
.convert();
</code>
WAV 转码 AAC
<code>
public void wav2Aac(String input_file, String output_file) {
int COMPRESSED_AUDIO_FILE_BIT_RATE = 64000; // 64kbps
int SAMPLING_RATE = 16000;
int BUFFER_SIZE = 48000;
int CODEC_TIMEOUT_IN_MS = 5000;
String COMPRESSED_AUDIO_FILE_MIME_TYPE = "audio/mp4a-latm";
String LOGTAG = "WAV编码AAC";
new Thread() {
@Override
public void run() {
try {
Runtime.getRuntime().gc();
android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_BACKGROUND);
File inputFile = new File(input_file);
FileInputStream fis = new FileInputStream(inputFile);
File outputFile = new File(output_file);
if (outputFile.exists()) outputFile.delete();
MediaMuxer mux = new MediaMuxer(outputFile.getAbsolutePath(), MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4);
MediaFormat outputFormat = MediaFormat.createAudioFormat(COMPRESSED_AUDIO_FILE_MIME_TYPE, SAMPLING_RATE, 1);
outputFormat.setInteger(MediaFormat.KEY_AAC_PROFILE, MediaCodecInfo.CodecProfileLevel.AACObjectLC);
outputFormat.setInteger(MediaFormat.KEY_BIT_RATE, COMPRESSED_AUDIO_FILE_BIT_RATE);
outputFormat.setInteger(MediaFormat.KEY_MAX_INPUT_SIZE, 16384);
MediaCodec codec = MediaCodec.createEncoderByType(COMPRESSED_AUDIO_FILE_MIME_TYPE);
codec.configure(outputFormat, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE);
codec.start();
ByteBuffer[] codecInputBuffers = codec.getInputBuffers(); // Note: Array of buffers
ByteBuffer[] codecOutputBuffers = codec.getOutputBuffers();
MediaCodec.BufferInfo outBuffInfo = new MediaCodec.BufferInfo();
byte[] tempBuffer = new byte[BUFFER_SIZE];
boolean hasMoreData = true;
double presentationTimeUs = 0;
int audioTrackIdx = 0;
int totalBytesRead = 0;
int percentComplete = 0;
do {
int inputBufIndex = 0;
while (inputBufIndex != -1 && hasMoreData) {
inputBufIndex = codec.dequeueInputBuffer(CODEC_TIMEOUT_IN_MS);
if (inputBufIndex >= 0) {
ByteBuffer dstBuf = codecInputBuffers[inputBufIndex];
dstBuf.clear();
int bytesRead = fis.read(tempBuffer, 0, dstBuf.limit());
Log.e("bytesRead", "Readed " + bytesRead);
if (bytesRead == -1) { // -1 implies EOS
hasMoreData = false;
codec.queueInputBuffer(inputBufIndex, 0, 0, (long) presentationTimeUs, MediaCodec.BUFFER_FLAG_END_OF_STREAM);
} else {
totalBytesRead += bytesRead;
dstBuf.put(tempBuffer, 0, bytesRead);
codec.queueInputBuffer(inputBufIndex, 0, bytesRead, (long) presentationTimeUs, 0);
presentationTimeUs = 1000000l * (totalBytesRead / 2) / SAMPLING_RATE;
}
}
}
// Drain audio
int outputBufIndex = 0;
while (outputBufIndex != MediaCodec.INFO_TRY_AGAIN_LATER) {
outputBufIndex = codec.dequeueOutputBuffer(outBuffInfo, CODEC_TIMEOUT_IN_MS);
if (outputBufIndex >= 0) {
ByteBuffer encodedData = codecOutputBuffers[outputBufIndex];
encodedData.position(outBuffInfo.offset);
encodedData.limit(outBuffInfo.offset + outBuffInfo.size);
if ((outBuffInfo.flags & MediaCodec.BUFFER_FLAG_CODEC_CONFIG) != 0 && outBuffInfo.size != 0) {
codec.releaseOutputBuffer(outputBufIndex, false);
} else {
mux.writeSampleData(audioTrackIdx, codecOutputBuffers[outputBufIndex], outBuffInfo);
codec.releaseOutputBuffer(outputBufIndex, false);
}
} else if (outputBufIndex == MediaCodec.INFO_OUTPUT_FORMAT_CHANGED) {
outputFormat = codec.getOutputFormat();
Log.v(LOGTAG, "Output format changed - " + outputFormat);
audioTrackIdx = mux.addTrack(outputFormat);
mux.start();
} else if (outputBufIndex == MediaCodec.INFO_OUTPUT_BUFFERS_CHANGED) {
Log.e(LOGTAG, "Output buffers changed during encode!");
} else if (outputBufIndex == MediaCodec.INFO_TRY_AGAIN_LATER) {
// NO OP
} else {
Log.e(LOGTAG, "Unknown return code from dequeueOutputBuffer - " + outputBufIndex);
}
}
percentComplete = (int) Math.round(((float) totalBytesRead / (float) inputFile.length()) * 100.0);
sendMessage(onProgressing, percentComplete);
} while (outBuffInfo.flags != MediaCodec.BUFFER_FLAG_END_OF_STREAM);
fis.close();
mux.stop();
mux.release();
Runtime.getRuntime().gc();
} catch (FileNotFoundException e) {
sendMessage(TransferformatError, e);
} catch (IOException e) {
sendMessage(TransferformatError, e);
}
}
}.start();
}
</code>
<code>
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case onProgressing:
transferformatListener.onProgress(msg.arg1);
if (msg.arg1 == 100)
transferformatListener.Finish();
break;
case Finish:
transferformatListener.Finish();
break;
case TransferformatError:
transferformatListener.TransferformatError((Exception) msg.obj);
break;
default:
break;
}
}
};
private final int onProgressing = 0;
private final int Finish = 1;
private final int TransferformatError = 2;
private void sendMessage(int what, Object obj) {
Message msg = mHandler.obtainMessage();
switch (what) {
case onProgressing:
msg.arg1 = (int) obj;
break;
case TransferformatError:
msg.obj = obj;
break;
default:
break;
}
msg.what = what;
mHandler.sendMessage(msg);
}
private TransferformatListener transferformatListener;
public interface TransferformatListener {
void onProgress(int progress);
void Finish();
void TransferformatError(Exception e);
}
public void setTransferformatListener(TransferformatListener listener) {
this.transferformatListener = listener;
}
</code>
后续会补充更多有关ffmpeg的内容
======================分割线=========================
打算这周日和家进去游泳。😀 旱鸭子 其实我是想去喝水了 。妈的= =| 家进说教我游泳 我还没反应过来就买了泳衣。我现在严重怀疑 家进是不是想去撩妹拉我壮胆。嗯 树立一个小目标 学会游泳。其实挺感谢这孙子帮我抢到一加五的 听说拍照不错 先玩玩 练手。培养兴趣 总宅着 感觉都快发霉了。不过发货很慢。。。打算周末北京各个角落游玩 有兴趣的一起。
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