1.下載lame庫

lame庫下載地址(以下使用的是lame?v3.100)

2.源碼導入

解壓下載的lame庫，把libmp3lame文件夾下后綴為.c .h的文件（不包括子文件夾i386和vector下的）復制到cpp/lame文件夾內，同時把include目錄下的lame.h也復制到cpp/lame文件夾內，此時 lame文件夾內包含42個文件。

3.修改庫文件

打開剛剛拷貝的lame庫文件，修改：

util.h 文件，把 570 行的兩處 ieee754_float32_t 改為 float 因為Android下并不支持該類型

set_get.h 文件，把頭部的 #include <lame.h> 改為 #include "lame.h"

fft.c 文件，刪除第47行 #include "vector/lame_intrin.h"

id3tag.c和machine.h兩個文件里，將HAVE_STRCHR和HAVE_MEMCPY的ifdef結構體刪除或者注釋

#ifdef STDC_HEADERS # include <stdlib.h> # include <string.h> #else /*# ifndef HAVE_STRCHR # define strchr index # define strrchr rindex # endif*/ char *strchr(), *strrchr(); /*# ifndef HAVE_MEMCPY # define memcpy(d, s, n) bcopy ((s), (d), (n)) # define memmove(d, s, n) bcopy ((s), (d), (n)) # endif*/ #endif

可參考以下完整修改文件

diff --git a/VbrTag.c b/VbrTag.c index 5800a44..36ee7b6 100644 --- a/VbrTag.c +++ b/VbrTag.c @@ -26,6 +26,8 @@# include <config.h>#endif+#include <stdlib.h> +#include <string.h>#include "lame.h"#include "machine.h"#include "encoder.h" diff --git a/bitstream.c b/bitstream.c index aa35915..a2fe294 100644 --- a/bitstream.c +++ b/bitstream.c @@ -29,6 +29,7 @@#include <stdlib.h>#include <stdio.h> +#include <string.h>#include "lame.h"#include "machine.h" diff --git a/encoder.c b/encoder.c index 48f46c7..437067f 100644 --- a/encoder.c +++ b/encoder.c @@ -30,6 +30,7 @@#endif+#include <string.h>#include "lame.h"#include "machine.h"#include "encoder.h" diff --git a/fft.c b/fft.c index 4eea1ad..27febdb 100644 --- a/fft.c +++ b/fft.c @@ -44,7 +44,7 @@#include "util.h" --- a/fft.c +++ b/fft.c @@ -44,7 +44,7 @@#include "util.h"#include "fft.h"-#include "vector/lame_intrin.h" +//#include "vector/lame_intrin.h"diff --git a/id3tag.c b/id3tag.c index ac48510..8f148b8 100644 --- a/id3tag.c +++ b/id3tag.c @@ -41,17 +41,20 @@# include <string.h># include <ctype.h>#else -# ifndef HAVE_STRCHR -# define strchr index -# define strrchr rindex -# endif +//# ifndef HAVE_STRCHR +//# define strchr index +//# define strrchr rindex +//# endifchar *strchr(), *strrchr(); -# ifndef HAVE_MEMCPY -# define memcpy(d, s, n) bcopy ((s), (d), (n)) -# endif +//# ifndef HAVE_MEMCPY +//# define memcpy(d, s, n) bcopy ((s), (d), (n)) +//# endif#endif+#include <malloc.h> +#include <string.h> +#include <stdlib.h>#include "lame.h"#include "machine.h"#include "encoder.h" diff --git a/lame.c b/lame.c index cb82225..299fd56 100644 --- a/lame.c +++ b/lame.c @@ -31,6 +31,8 @@#endif+#include <malloc.h> +#include <string.h>#include "lame.h"#include "machine.h"diff --git a/machine.h b/machine.h index bf6fff2..c675c20 100644 --- a/machine.h +++ b/machine.h @@ -31,15 +31,15 @@# include <stdlib.h># include <string.h>#else -# ifndef HAVE_STRCHR -# define strchr index -# define strrchr rindex -# endif +//# ifndef HAVE_STRCHR +//# define strchr index +//# define strrchr rindex +//# endifchar *strchr(), *strrchr(); -# ifndef HAVE_MEMCPY -# define memcpy(d, s, n) bcopy ((s), (d), (n)) -# define memmove(d, s, n) bcopy ((s), (d), (n)) -# endif +//# ifndef HAVE_MEMCPY +//# define memcpy(d, s, n) bcopy ((s), (d), (n)) +//# define memmove(d, s, n) bcopy ((s), (d), (n)) +//# endif#endif#if defined(__riscos__) && defined(FPA10) diff --git a/newmdct.c b/newmdct.c index 596cac9..ac98abd 100644 --- a/newmdct.c +++ b/newmdct.c @@ -30,6 +30,7 @@# include <config.h>#endif+#include <string.h>#include "lame.h"#include "machine.h"#include "encoder.h" diff --git a/psymodel.c b/psymodel.c index 60076ee..1393c2a 100644 --- a/psymodel.c +++ b/psymodel.c @@ -145,7 +145,8 @@ blocktype_d[2] block type to use for previous granule#endif#include <float.h> - +#include <stdlib.h> +#include <string.h>#include "lame.h"#include "machine.h"#include "encoder.h" diff --git a/quantize.c b/quantize.c index 9ba9c16..2906c00 100644 --- a/quantize.c +++ b/quantize.c @@ -28,6 +28,8 @@# include <config.h>#endif+#include <stdlib.h> +#include <string.h>#include "lame.h"#include "machine.h"#include "encoder.h" diff --git a/quantize_pvt.c b/quantize_pvt.c :#endif#include <float.h> - +#include <stdlib.h> +#include <string.h>#include "lame.h"#include "machine.h"#include "encoder.h" diff --git a/quantize.c b/quantize.c index 9ba9c16..2906c00 100644 --- a/quantize.c +++ b/quantize.c @@ -28,6 +28,8 @@# include <config.h>#endif+#include <stdlib.h> +#include <string.h>#include "lame.h"#include "machine.h"#include "encoder.h" diff --git a/quantize_pvt.c b/quantize_pvt.c index d8d6447..3cd9966 100644 --- a/quantize_pvt.c +++ b/quantize_pvt.c @@ -36,6 +36,7 @@#include "reservoir.h"#include "lame-analysis.h"#include <float.h> +#include <string.h>#define NSATHSCALE 100 /* Assuming dynamic range=96dB, this value should be 92 */ diff --git a/set_get.h b/set_get.h index 37e4bcd..99ab73c 100644 --- a/set_get.h +++ b/set_get.h @@ -21,7 +21,7 @@#ifndef __SET_GET_H__#define __SET_GET_H__-#include <lame.h> +#include "lame.h"#if defined(__cplusplus)extern "C" { diff --git a/takehiro.c b/takehiro.c index 67aba1b..ca02f98 100644 --- a/takehiro.c +++ b/takehiro.c @@ -27,6 +27,7 @@#endif+#include <string.h>#include "lame.h"#include "machine.h"#include "encoder.h" diff --git a/util.c b/util.c index 43b457c..e9255fe 100644 --- a/util.c +++ b/util.c @@ -27,6 +27,7 @@#endif#include <float.h> +#include <malloc.h>#include "lame.h"#include "machine.h"#include "encoder.h" diff --git a/util.h b/util.h index 13f0cd4..b6bf306 100644 --- a/util.h +++ b/util.h @@ -567,7 +567,7 @@ extern "C" {/* log/log10 approximations */extern void init_log_table(void); - extern ieee754_float32_t fast_log2(ieee754_float32_t x); + extern float fast_log2(float x);int isResamplingNecessary(SessionConfig_t const* cfg);diff --git a/vbrquantize.c b/vbrquantize.c index 0f703b7..60834d3 100644 --- a/vbrquantize.c +++ b/vbrquantize.c @@ -27,6 +27,8 @@#endif+#include <stdlib.h> +#include <string.h>#include "lame.h"#include "machine.h"#include "encoder.h"

4.編寫CmakeList.txt

cmake_minimum_required(VERSION 3.6.0) set(CURRENT_DIR ${CMAKE_SOURCE_DIR}) message("CURRENT_DIR:" ${CMAKE_SOURCE_DIR}) include_directories(${CMAKE_SOURCE_DIR}src/main/cpp/lame)set(LAME_DIR src/main/cpp/lame) message("LAME_DIR:" ${LAME_DIR})aux_source_directory(src/main/cpp/lame SRC_LIST)add_library(mp3lameSHAREDsrc/main/cpp/MP3Recorder.c${SRC_LIST})#add_library(mp3lame # SHARED # src/main/cpp/MP3Recorder.c # src/main/cpp/lame/bitstream.c # src/main/cpp/lame/fft.c # src/main/cpp/lame/id3tag.c # src/main/cpp/lame/mpglib_interface.c # src/main/cpp/lame/presets.c # src/main/cpp/lame/quantize.c # src/main/cpp/lame/reservoir.c # src/main/cpp/lame/tables.c # src/main/cpp/lame/util.c # src/main/cpp/lame/VbrTag.c # src/main/cpp/lame/encoder.c # src/main/cpp/lame/gain_analysis.c # src/main/cpp/lame/lame.c # src/main/cpp/lame/newmdct.c # src/main/cpp/lame/psymodel.c # src/main/cpp/lame/quantize_pvt.c # src/main/cpp/lame/set_get.c # src/main/cpp/lame/takehiro.c # src/main/cpp/lame/vbrquantize.c # src/main/cpp/lame/version.c)find_library( # Sets the name of the path variable.log-liblog)target_link_libraries(mp3lame${log-lib})

5.編寫 java 類和 c 文件

public class MP3Recorder {static {System.loadLibrary("mp3lame"); }/*** 初始化 lame編碼器** @param inSampleRate* 輸入采樣率* @param outChannel* 聲道數* @param outSampleRate* 輸出采樣率* @param outBitrate* 比特率(kbps)* @param quality* 0~9，0最好*/public static native void init(int inSampleRate, int outChannel, int outSampleRate, int outBitrate, int quality);/*** 編碼，把 AudioRecord 錄制的 PCM 數據轉換成 mp3 格式** @param buffer_l* 左聲道輸入數據* @param buffer_r* 右聲道輸入數據* @param samples* 輸入數據的size* @param mp3buf* 輸出數據* @return* 輸出到mp3buf的byte數量*/public static native int encode(short[] buffer_l, short[] buffer_r, int samples, byte[] mp3buf);/*** 刷寫** @param mp3buf* mp3數據緩存區* @return* 返回刷寫的數量*/public static native int flush(byte[] mp3buf);/*** 關閉 lame 編碼器，釋放資源*/public static native void close(); }

6.編寫MP3Recorder.c

#include "lame/lame.h" #include "MP3Recorder.h"static lame_global_flags *glf = NULL; /** Class: com_android_liblame_MP3Recorder* Method: init* Signature: (IIIII)V*/JNIEXPORT void JNICALL Java_com_android_liblame_MP3Recorder_init(JNIEnv *env, jclass instance, 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);}/** Class: com_android_liblame_MP3Recorder* Method: encode* Signature: ([S[SI[B)I*/ JNIEXPORT jint JNICALL Java_com_android_liblame_MP3Recorder_encode(JNIEnv *env, jclass instance, 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; }/** Class: com_android_liblame_MP3Recorder* Method: flush* Signature: ([B)I*/ JNIEXPORT jint JNICALL Java_com_android_liblame_MP3Recorder_flush(JNIEnv *env, jclass instance, 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; }/** Class: com_android_liblame_MP3Recorder* Method: close* Signature: ()V*/ JNIEXPORT void JNICALL Java_com_android_liblame_MP3Recorder_close(JNIEnv *env, jclass instance) {lame_close(glf);glf = NULL;}

7.配置build.gradle

android {..........//*externalNativeBuild {cmake {path "CMakeLists.txt"}}}

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原文地址：

https://www.jianshu.com/p/d979ce51d804

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