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Android中怎么录制mp3格式文件,相信很多没有经验的人对此束手无策,为此本文总结了问题出现的原因和解决方法,通过这篇文章希望你能解决这个问题。
工具
MP3格式是用一个开源项目转的,MP3lame,由于该项目用到了jni,所以需要大家配置好ndk环境,环境配置在此就不多说了,大家可以自行百度,最新的应该很好配置。
创建jni
拷贝文件
下载好后(我下载的是3.98.4版本)打开,找到libmp3lame文件,将里面的.h和.c拷贝下来,在自己的工程里创建jni文件夹,在jni文件夹下新建一个文件夹(我的命名为lame-3.98.4_libmp3lame,后面会用到),将刚才拷贝的文件复制进去,然后再把include文件夹里的lame.h也拷贝进去。
创建Android.mk
在jni中创建文件,Android.mk
LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) LAME_LIBMP3_DIR := lame-3.98.4_libmp3lame LOCAL_MODULE := mp3lame LOCAL_SRC_FILES := $(LAME_LIBMP3_DIR)/bitstream.c $(LAME_LIBMP3_DIR)/fft.c $(LAME_LIBMP3_DIR)/id3tag.c $(LAME_LIBMP3_DIR)/mpglib_interface.c $(LAME_LIBMP3_DIR)/presets.c $(LAME_LIBMP3_DIR)/quantize.c $(LAME_LIBMP3_DIR)/reservoir.c $(LAME_LIBMP3_DIR)/tables.c $(LAME_LIBMP3_DIR)/util.c $(LAME_LIBMP3_DIR)/VbrTag.c $(LAME_LIBMP3_DIR)/encoder.c $(LAME_LIBMP3_DIR)/gain_analysis.c $(LAME_LIBMP3_DIR)/lame.c $(LAME_LIBMP3_DIR)/newmdct.c $(LAME_LIBMP3_DIR)/psymodel.c $(LAME_LIBMP3_DIR)/quantize_pvt.c $(LAME_LIBMP3_DIR)/set_get.c $(LAME_LIBMP3_DIR)/takehiro.c $(LAME_LIBMP3_DIR)/vbrquantize.c $(LAME_LIBMP3_DIR)/version.c com_maxi_mp3record_MP3Recorder.c include $(BUILD_SHARED_LIBRARY)
**注意:**LAME_LIBMP3_DIR := lame-3.98.4_libmp3lame 需要将其改为你的项目中的文件名,即上面说的jni下新建的文件夹。
大家应该看到了最后一句的com_maxi_mp3record_MP3Recorder.c
很明显这是我自己创建的.c文件。用来调用mp3lame中的接口的,对应着我java中的com.maxi.mp3record.MP3Recorder.java。咱们先创建java文件。
创建MP3Recorder.java
对应你的包名建一个MP3Recorder.java文件,该文件是java文件对应你的包名建立即可。
package cn.ctvonline.android.modules.project.widget; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import android.media.AudioFormat; import android.media.AudioRecord; import android.media.MediaRecorder; import android.os.Handler; /** * <b>类功能描述:</b><div > * MP3实时录制功能,可暂停,注意因踩用Native开发,不能混淆 */ public class MP3Recorder { private String filePath; private int sampleRate; private boolean isRecording = false; private boolean isPause = false; private Handler handler; /** * 开始录音 */ public static final int MSG_REC_STARTED = 1; /** * 结束录音 */ public static final int MSG_REC_STOPPED = 2; /** * 暂停录音 */ public static final int MSG_REC_PAUSE = 3; /** * 继续录音 */ public static final int MSG_REC_RESTORE = 4; /** * 缓冲区挂了,采样率手机不支持 */ public static final int MSG_ERROR_GET_MIN_BUFFERSIZE = -1; /** * 创建文件时扑街了 */ public static final int MSG_ERROR_CREATE_FILE = -2; /** * 初始化录音器时扑街了 */ public static final int MSG_ERROR_REC_START = -3; /** * 录紧音的时候出错 */ public static final int MSG_ERROR_AUDIO_RECORD = -4; /** * 编码时挂了 */ public static final int MSG_ERROR_AUDIO_ENCODE = -5; /** * 写文件时挂了 */ public static final int MSG_ERROR_WRITE_FILE = -6; /** * 没法关闭文件流 */ public static final int MSG_ERROR_CLOSE_FILE = -7; public MP3Recorder(int sampleRate) { this.sampleRate = sampleRate; } public void setFilePath(String filePath) { this.filePath = filePath; } /** * 开片 */ public void start() { if (isRecording) { return; } new Thread() { @Override public void run() { android.os.Process .setThreadPriority(android.os.Process.THREAD_PRIORITY_URGENT_AUDIO); // 根据定义好的几个配置,来获取合适的缓冲大小 final int minBufferSize = AudioRecord.getMinBufferSize( sampleRate, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT); if (minBufferSize < 0) { if (handler != null) { handler.sendEmptyMessage(MSG_ERROR_GET_MIN_BUFFERSIZE); } return; } AudioRecord audioRecord = new AudioRecord( MediaRecorder.AudioSource.MIC, sampleRate, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT, minBufferSize * 2); // 5秒的缓冲 short[] buffer = new short[sampleRate * (16 / 8) * 1 * 5]; byte[] mp3buffer = new byte[(int) (7200 + buffer.length * 2 * 1.25)]; FileOutputStream output = null; try { File file = createSDFile(filePath); output = new FileOutputStream(file); } catch (FileNotFoundException e) { if (handler != null) { handler.sendEmptyMessage(MSG_ERROR_CREATE_FILE); } return; } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } MP3Recorder.init(sampleRate, 1, sampleRate, 32); isRecording = true; // 录音状态 isPause = false; // 录音状态 try { try { audioRecord.startRecording(); // 开启录音获取音频数据 if (mListener != null) { mListener.wellPrepared(); } } catch (IllegalStateException e) { // 不给录音... if (handler != null) { handler.sendEmptyMessage(MSG_ERROR_REC_START); } return; } try { // 开始录音 if (handler != null) { handler.sendEmptyMessage(MSG_REC_STARTED); } int readSize = 0; boolean pause = false; while (isRecording) { /*--暂停--*/ if (isPause) { if (!pause) { handler.sendEmptyMessage(MSG_REC_PAUSE); pause = true; } continue; } if (pause) { handler.sendEmptyMessage(MSG_REC_RESTORE); pause = false; } /*--End--*/ /*--实时录音写数据--*/ readSize = audioRecord.read(buffer, 0, minBufferSize); voiceLevel = getVoiceSize(readSize, buffer); if (readSize < 0) { if (handler != null) { handler.sendEmptyMessage(MSG_ERROR_AUDIO_RECORD); } break; } else if (readSize == 0) { ; } else { int encResult = MP3Recorder.encode(buffer, buffer, readSize, mp3buffer); if (encResult < 0) { if (handler != null) { handler.sendEmptyMessage(MSG_ERROR_AUDIO_ENCODE); } break; } if (encResult != 0) { try { output.write(mp3buffer, 0, encResult); } catch (IOException e) { if (handler != null) { handler.sendEmptyMessage(MSG_ERROR_WRITE_FILE); } break; } } } /*--End--*/ } /*--录音完--*/ int flushResult = MP3Recorder.flush(mp3buffer); if (flushResult < 0) { if (handler != null) { handler.sendEmptyMessage(MSG_ERROR_AUDIO_ENCODE); } } if (flushResult != 0) { try { output.write(mp3buffer, 0, flushResult); } catch (IOException e) { if (handler != null) { handler.sendEmptyMessage(MSG_ERROR_WRITE_FILE); } } } try { output.close(); } catch (IOException e) { if (handler != null) { handler.sendEmptyMessage(MSG_ERROR_CLOSE_FILE); } } /*--End--*/ } finally { audioRecord.stop(); audioRecord.release(); } } finally { MP3Recorder.close(); isRecording = false; } if (handler != null) { handler.sendEmptyMessage(MSG_REC_STOPPED); } } }.start(); } public void stop() { isRecording = false; } public void pause() { isPause = true; } public void restore() { isPause = false; } public boolean isRecording() { return isRecording; } public boolean isPaus() { if (!isRecording) { return false; } return isPause; } // 获得声音的level public int getVoiceSize(int r, short[] buffer) { if (isRecording) { try { long v = 0; // 将 buffer 内容取出,进行平方和运算 for (int i = 0; i < buffer.length; i++) { v += buffer[i] * buffer[i]; } // 平方和除以数据总长度,得到音量大小。 double mean = v / (double) r; double volume = 10 * Math.log10(mean); return (((int) volume / 10) - 1); } catch (Exception e) { // TODO Auto-generated catch block } } return 1; } /** * 在SD卡上创建文件 * * @throws IOException */ public static File createSDFile(String fileName) throws IOException { File file = new File(fileName); if (!isFileExists(file)) if (file.isDirectory()) { file.mkdirs(); } else { file.createNewFile(); } return file; } private int voiceLevel; public int getVoiceLevel() { return voiceLevel; } public interface AudioStageListener { void wellPrepared(); } public AudioStageListener mListener; public void setOnAudioStageListener(AudioStageListener listener) { mListener = listener; } /** * 录音状态管理 * * @see RecMicToMp3#MSG_REC_STARTED * @see RecMicToMp3#MSG_REC_STOPPED * @see RecMicToMp3#MSG_REC_PAUSE * @see RecMicToMp3#MSG_REC_RESTORE * @see RecMicToMp3#MSG_ERROR_GET_MIN_BUFFERSIZE * @see RecMicToMp3#MSG_ERROR_CREATE_FILE * @see RecMicToMp3#MSG_ERROR_REC_START * @see RecMicToMp3#MSG_ERROR_AUDIO_RECORD * @see RecMicToMp3#MSG_ERROR_AUDIO_ENCODE * @see RecMicToMp3#MSG_ERROR_WRITE_FILE * @see RecMicToMp3#MSG_ERROR_CLOSE_FILE */ public void setHandle(Handler handler) { this.handler = handler; } /*--以下为Native部分--*/ static { System.loadLibrary("mp3lame"); } /** * 初始化录制参数 */ public static void init(int inSamplerate, int outChannel, int outSamplerate, int outBitrate) { init(inSamplerate, outChannel, outSamplerate, outBitrate, 7); } /** * 初始化录制参数 quality:0=很好很慢 9=很差很快 */ public native static void init(int inSamplerate, int outChannel, int outSamplerate, int outBitrate, int quality); /** * 音频数据编码(PCM左进,PCM右进,MP3输出) */ public native static int encode(short[] buffer_l, short[] buffer_r, int samples, byte[] mp3buf); /** * 据说录完之后要刷干净缓冲区 */ public native static int flush(byte[] mp3buf); /** * 结束编码 */ public native static void close(); }
创建c文件
在创建c文件,创建在jni下,命名就按你的java文件所在的包名命名”.”替换为“_”。例如:com_maxi_mp3record_MP3Recorder.c。当然还得有头文件:com_maxi_mp3record_MP3Recorder.h。
com_maxi_mp3record_MP3Recorder.c
#include "lame-3.98.4_libmp3lame/lame.h" #include "com_maxi_mp3record_MP3Recorder.h" static lame_global_flags *glf = NULL; JNIEXPORT void JNICALL Java_com_maxi_mp3record_MP3Recorder_init( JNIEnv *env, jclass cls, jint inSamplerate, jint outChannel, jint outSamplerate, jint outBitrate, jint quality) { if (glf != NULL) { lame_close(glf); glf = NULL; } glf = lame_init(); lame_set_in_samplerate(glf, inSamplerate); lame_set_num_channels(glf, outChannel); lame_set_out_samplerate(glf, outSamplerate); lame_set_brate(glf, outBitrate); lame_set_quality(glf, quality); lame_init_params(glf); } JNIEXPORT jint JNICALL Java_com_maxi_mp3record_MP3Recorder_encode( JNIEnv *env, jclass cls, jshortArray buffer_l, jshortArray buffer_r, jint samples, jbyteArray mp3buf) { jshort* j_buffer_l = (*env)->GetShortArrayElements(env, buffer_l, NULL); jshort* j_buffer_r = (*env)->GetShortArrayElements(env, buffer_r, NULL); const jsize mp3buf_size = (*env)->GetArrayLength(env, mp3buf); jbyte* j_mp3buf = (*env)->GetByteArrayElements(env, mp3buf, NULL); int result = lame_encode_buffer(glf, j_buffer_l, j_buffer_r, samples, j_mp3buf, mp3buf_size); (*env)->ReleaseShortArrayElements(env, buffer_l, j_buffer_l, 0); (*env)->ReleaseShortArrayElements(env, buffer_r, j_buffer_r, 0); (*env)->ReleaseByteArrayElements(env, mp3buf, j_mp3buf, 0); return result; } JNIEXPORT jint JNICALL Java_com_maxi_mp3record_MP3Recorder_flush( JNIEnv *env, jclass cls, jbyteArray mp3buf) { const jsize mp3buf_size = (*env)->GetArrayLength(env, mp3buf); jbyte* j_mp3buf = (*env)->GetByteArrayElements(env, mp3buf, NULL); int result = lame_encode_flush(glf, j_mp3buf, mp3buf_size); (*env)->ReleaseByteArrayElements(env, mp3buf, j_mp3buf, 0); return result; } JNIEXPORT void JNICALL Java_com_maxi_mp3record_MP3Recorder_close( JNIEnv *env, jclass cls) { lame_close(glf); glf = NULL; }
com_maxi_mp3record_MP3Recorder.h
/* DO NOT EDIT THIS FILE - it is machine generated */ #include <jni.h> /* Header for class com_maxi_mp3record_MP3Recorder */ #ifndef _Included_com_maxi_mp3record_MP3Recorder #define _Included_com_maxi_mp3record_MP3Recorder #ifdef __cplusplus extern "C" { #endif /* * Class: com_maxi_mp3record_MP3Recorder * Method: init * Signature: (IIIII)V */ JNIEXPORT void JNICALL Java_com_maxi_mp3record_MP3Recorder_init (JNIEnv *, jclass, jint, jint, jint, jint, jint); /* * Class: com_maxi_mp3record_MP3Recorder * Method: encode * Signature: ([S[SI[B)I */ JNIEXPORT jint JNICALL Java_com_maxi_mp3record_MP3Recorder_encode (JNIEnv *, jclass, jshortArray, jshortArray, jint, jbyteArray); /* * Class: com_maxi_mp3record_MP3Recorder * Method: flush * Signature: ([B)I */ JNIEXPORT jint JNICALL Java_com_maxi_mp3record_MP3Recorder_flush (JNIEnv *, jclass, jbyteArray); /* * Class: com_maxi_mp3record_MP3Recorder * Method: close * Signature: ()V */ JNIEXPORT void JNICALL Java_com_maxi_mp3record_MP3Recorder_close (JNIEnv *, jclass); #ifdef __cplusplus } #endif #endif
这俩文件别只复制不看内容啊,里面可都是连接java和c的接口,所以不能有差错。举个例子吧,#ifndef _Included_com_maxi_mp3record_MP3Recorder,这个就得替换成你对应的包名,里面所有都得替换成你自己的程序对应的包名。
编译ndk
创建Application.mk在你的项目文件的jni下,在里面写入:
APP_ABI := all
如果不加,NDK只会编译“armeabi”,然而安卓有很多不同类型的处理器,所以我们不止需要arm。相信你们搞到现在了肯定ndk都配置好了,然后打开终端,进入到你的项目(找到你的ndk目录下的ndk-bulid,最好把它添加到环境变量里,对于以后编译比较方便,在此默认你没添加环境变量),执行ndk-bulid。稍等片刻你会发现你的项目里多了一个obj文件夹,obj文件夹下会生成”arm64-v8a”、”armeabi”、”armeabi-v7a”、”mips”、”mips64”、”x86”、”x86_64”。打开它,各个文件夹下会有一个libmp3lame.so。ok,没错那就是你要的“滑板鞋”。将它放入你的libs文件下,没有自行创建,各个平台便都可以加载了。
使用方法
MP3Recorder recorder = new MP3Recorder(8000); recorder.setFilePath(voicePath);//录音保存目录 recorder.start();//开始录音 recorder.stop();//录音结束 recorder.getVoiceLevel()//这是我封装的获取音频振幅接口,大家可以用来录音的时候显示声音大小,数据自行调节。
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