MediaMuxer的使用

h264与aac（不包含adts头）合成mp4。

package local.asuper.localplayer.mediacodec;import android.media.MediaCodec;
import android.media.MediaExtractor;
import android.media.MediaFormat;
import android.media.MediaMuxer;
import android.os.Build;
import android.support.annotation.RequiresApi;
import android.util.Log;import java.io.IOException;
import java.nio.ByteBuffer;/*** @说明 h264   aac   muxer 成mp4* 直接muxer h264和aac 无法muxer，* audioExtractor.setDataSource(sdcard_path + "/input.aac");无法读取* 1.需要将h264先混合成mpeg4包装的mp4（无音频）* 2.需要将aac（无adts）先混合成mpeg4容器包装的mp4（无视频）* 3.muxer混合包装好的音频和视频（分别从包装好的中重新分离出来aac和H264），生成新的视频文件*/public class H264_AAC_toMp4_MediaMuxer {private static String TAG = "H264_AAC_toMp4_MediaMuxer";/*** aac 复用 成mp4（无视频）*/@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)public static void muxerAudio(String sdcard_path) {MediaMuxer audioMuxer;MediaExtractor mediaExtractor = null;try {mediaExtractor = new MediaExtractor();audioMuxer = new MediaMuxer(sdcard_path + "/mux_audio.mp4", MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4);mediaExtractor.setDataSource(sdcard_path + "/input.mp4");int trackCount = mediaExtractor.getTrackCount();int audioTrackIndex = -1;for (int i = 0; i < trackCount; i++) {MediaFormat trackFormat = mediaExtractor.getTrackFormat(i);String mineType = trackFormat.getString(MediaFormat.KEY_MIME);//音频信道if (mineType.startsWith("audio/")) {audioTrackIndex = i;}}ByteBuffer byteBuffer = ByteBuffer.allocate(500 * 1024);MediaCodec.BufferInfo bufferInfo = new MediaCodec.BufferInfo();//切换到音频信道mediaExtractor.selectTrack(audioTrackIndex);MediaFormat trackFormat = mediaExtractor.getTrackFormat(audioTrackIndex);int writeAudioIndex = audioMuxer.addTrack(trackFormat);audioMuxer.start();long sampletime = 0;long first_sampletime = 0;long second_sampletime = 0;{//  mediaExtractor.readSampleData(byteBuffer, 0);//   mediaExtractor.advance();mediaExtractor.readSampleData(byteBuffer, 0);first_sampletime = mediaExtractor.getSampleTime();mediaExtractor.advance();second_sampletime = mediaExtractor.getSampleTime();sampletime = Math.abs(second_sampletime - first_sampletime);//时间戳}mediaExtractor.unselectTrack(audioTrackIndex);mediaExtractor.selectTrack(audioTrackIndex);while (true) {int readSampleCount = mediaExtractor.readSampleData(byteBuffer, 0);Log.d(TAG, "audio:readSampleCount:" + readSampleCount);if (readSampleCount < 0) {break;}bufferInfo.size = readSampleCount;bufferInfo.offset = 0;bufferInfo.flags = mediaExtractor.getSampleFlags();bufferInfo.presentationTimeUs += sampletime;audioMuxer.writeSampleData(writeAudioIndex, byteBuffer, bufferInfo);byteBuffer.clear();mediaExtractor.advance();}Log.d(TAG, "muxerAudio finished!\n");audioMuxer.stop();audioMuxer.release();mediaExtractor.release();} catch (IOException e) {e.printStackTrace();}}/*** h264 复用 成 mp4（无音频）*/@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)public static void muxerVideo(String sdcard_path) {MediaMuxer videoMuxer;MediaExtractor mediaExtractor = null;try {mediaExtractor = new MediaExtractor();videoMuxer = new MediaMuxer(sdcard_path + "/mux_video.mp4", MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4);mediaExtractor.setDataSource(sdcard_path + "/input.mp4");int trackCount = mediaExtractor.getTrackCount();int videoTrackIndex = -1;for (int i = 0; i < trackCount; i++) {MediaFormat trackFormat = mediaExtractor.getTrackFormat(i);String mineType = trackFormat.getString(MediaFormat.KEY_MIME);//音频信道if (mineType.startsWith("video/")) {videoTrackIndex = i;}}ByteBuffer byteBuffer = ByteBuffer.allocate(500 * 1024);MediaCodec.BufferInfo bufferInfo = new MediaCodec.BufferInfo();//切换到音频信道mediaExtractor.selectTrack(videoTrackIndex);MediaFormat trackFormat = mediaExtractor.getTrackFormat(videoTrackIndex);int writeVideoIndex = videoMuxer.addTrack(trackFormat);videoMuxer.start();long sampletime = 0;long first_sampletime = 0;long second_sampletime = 0;{//  mediaExtractor.readSampleData(byteBuffer, 0);//   mediaExtractor.advance();mediaExtractor.readSampleData(byteBuffer, 0);first_sampletime = mediaExtractor.getSampleTime();mediaExtractor.advance();second_sampletime = mediaExtractor.getSampleTime();sampletime = Math.abs(second_sampletime - first_sampletime);//时间戳}//上面只是获取时间戳，获取完后，重新选择下trackmediaExtractor.unselectTrack(videoTrackIndex);mediaExtractor.selectTrack(videoTrackIndex);while (true) {int readSampleCount = mediaExtractor.readSampleData(byteBuffer, 0);Log.d(TAG, "audio:readSampleCount:" + readSampleCount);if (readSampleCount < 0) {break;}bufferInfo.size = readSampleCount;bufferInfo.offset = 0;bufferInfo.flags = mediaExtractor.getSampleFlags();bufferInfo.presentationTimeUs += sampletime;videoMuxer.writeSampleData(writeVideoIndex, byteBuffer, bufferInfo);byteBuffer.clear();mediaExtractor.advance();}Log.d(TAG, "muxerVideo finished!\n");videoMuxer.stop();videoMuxer.release();mediaExtractor.release();} catch (IOException e) {e.printStackTrace();}}/*** 合并上面生成的aac（mp4容器） 和 h264（mp4容器）** @param sdcard_path*/@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)public static void combineVideo(String sdcard_path) {MediaMuxer mediaMuxer;MediaExtractor videoExtractor = null;MediaExtractor audioExtractor = null;try {audioExtractor = new MediaExtractor();videoExtractor = new MediaExtractor();mediaMuxer = new MediaMuxer(sdcard_path + "/mux_output.mp4", MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4);videoExtractor.setDataSource(sdcard_path + "/mux_video.mp4");audioExtractor.setDataSource(sdcard_path + "/mux_audio.mp4");int trackCount = videoExtractor.getTrackCount();int videoTrackIndex = -1;for (int i = 0; i < trackCount; i++) {MediaFormat videoFormat = videoExtractor.getTrackFormat(i);String mineType = videoFormat.getString(MediaFormat.KEY_MIME);//视频信道if (mineType.startsWith("video/")) {videoTrackIndex = i;}}int audioTrackIndex = -1;for (int i = 0; i < trackCount; i++) {MediaFormat audioFormat = audioExtractor.getTrackFormat(i);String mineType = audioFormat.getString(MediaFormat.KEY_MIME);//视频信道if (mineType.startsWith("audio/")) {audioTrackIndex = i;}}ByteBuffer byteBuffer = ByteBuffer.allocate(500 * 1024);MediaCodec.BufferInfo audiobufferInfo = new MediaCodec.BufferInfo();MediaCodec.BufferInfo videobufferInfo = new MediaCodec.BufferInfo();videoExtractor.selectTrack(videoTrackIndex);audioExtractor.selectTrack(audioTrackIndex);MediaFormat videotrackFormat = videoExtractor.getTrackFormat(videoTrackIndex);int writeVideoIndex = mediaMuxer.addTrack(videotrackFormat);MediaFormat audiotrackFormat = audioExtractor.getTrackFormat(audioTrackIndex);int writeAudioIndex = mediaMuxer.addTrack(audiotrackFormat);mediaMuxer.start();//videolong sampletime = 0;long first_sampletime = 0;long second_sampletime = 0;{videoExtractor.readSampleData(byteBuffer, 0);first_sampletime = videoExtractor.getSampleTime();videoExtractor.advance();second_sampletime = videoExtractor.getSampleTime();sampletime = Math.abs(second_sampletime - first_sampletime);//时间戳Log.d(TAG, "sampletime" + sampletime);}//上面只是获取时间戳，获取完后，重新选择下trackvideoExtractor.unselectTrack(videoTrackIndex);videoExtractor.selectTrack(videoTrackIndex);while (true) {int readSampleCount = videoExtractor.readSampleData(byteBuffer, 0);Log.d(TAG, "audio:readSampleCount:" + readSampleCount);if (readSampleCount < 0) {break;}audiobufferInfo.size = readSampleCount;audiobufferInfo.offset = 0;audiobufferInfo.flags = videoExtractor.getSampleFlags();audiobufferInfo.presentationTimeUs += sampletime;mediaMuxer.writeSampleData(writeVideoIndex, byteBuffer, audiobufferInfo);byteBuffer.clear();videoExtractor.advance();}//audiowhile (true) {int readSampleCount = audioExtractor.readSampleData(byteBuffer, 0);Log.d(TAG, "audio:readSampleCount:" + readSampleCount);if (readSampleCount < 0) {break;}videobufferInfo.size = readSampleCount;videobufferInfo.offset = 0;videobufferInfo.flags = audioExtractor.getSampleFlags();videobufferInfo.presentationTimeUs += sampletime;mediaMuxer.writeSampleData(writeAudioIndex, byteBuffer, videobufferInfo);byteBuffer.clear();audioExtractor.advance();}Log.d(TAG, "combineVideo finished!\n");mediaMuxer.stop();mediaMuxer.release();audioExtractor.release();videoExtractor.release();} catch (IOException e) {e.printStackTrace();}}
}

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