Android Studio开发引入Speex

首先配置Android Studio NDK以及下载Speex源码放入main/cpp/speex目录

在cpp目录下更改根CMakeList.tet文件：

一下是包含子目录得形式，

#指定需要CMAKE的最小版本
cmake_minimum_required(VERSION 3.4.1)#C 的编译选项是 CMAKE_C_FLAGS
# 指定编译参数，可选
SET(CMAKE_CXX_FLAGS "-Wno-error=format-security -Wno-error=pointer-sign")#设置生成的so动态库最后输出的路径
#set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${PROJECT_SOURCE_DIR}/../jniLibs/${ANDROID_ABI})#设置头文件搜索路径（和此txt同个路径的头文件无需设置），可选
#INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR}/common)#指定用到的系统库或者NDK库或者第三方库的搜索路径，可选。
#LINK_DIRECTORIES(/usr/local/lib)#添加子目录,将会调用子目录中的CMakeLists.txt
ADD_SUBDIRECTORY(speex)

在cpp/speex增加子文件：

# For more information about using CMake with Android Studio, read the
# documentation: https://d.android.com/studio/projects/add-native-code.html# Sets the minimum version of CMake required to build the native library.cmake_minimum_required(VERSION 3.4.1)# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds them for you.
# Gradle automatically packages shared libraries with your APK.
set(CMAKE_C_FLAGS "-DFIXED_POINT -DUSE_KISS_FFT -DEXPORT="" -UHAVE_CONFIG_H")add_library( # Sets the name of the library.speex-lib# Sets the library as a shared library.SHARED# Provides a relative path to your source file(s).speex_jni.cpp./libspeex/bits.c./libspeex/cb_search.c./libspeex/buffer.c./libspeex/exc_10_16_table.c./libspeex/exc_10_32_table.c./libspeex/exc_20_32_table.c./libspeex/exc_5_256_table.c./libspeex/exc_5_64_table.c./libspeex/exc_8_128_table.c./libspeex/fftwrap.c./libspeex/filterbank.c./libspeex/filters.c./libspeex/gain_table_lbr.c./libspeex/gain_table.c./libspeex/hexc_10_32_table.c./libspeex/hexc_table.c./libspeex/high_lsp_tables.c./libspeex/jitter.c./libspeex/kiss_fft.c./libspeex/kiss_fftr.c./libspeex/lpc.c./libspeex/lsp_tables_nb.c./libspeex/lsp.c./libspeex/ltp.c./libspeex/mdf.c./libspeex/modes_wb.c./libspeex/modes.c./libspeex/nb_celp.c./libspeex/preprocess.c./libspeex/quant_lsp.c./libspeex/sb_celp.c./libspeex/scal.c./libspeex/smallft.c./libspeex/speex_callbacks.c./libspeex/speex_header.c./libspeex/speex.c./libspeex/stereo.c./libspeex/vbr.c./libspeex/vorbis_psy.c./libspeex/vq.c./libspeex/window.c)#target_include_directories(speex-lib
#        PRIVATE
#        /include)
include_directories(include)
# Searches for a specified prebuilt library and stores the path as a
# variable. Because CMake includes system libraries in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.find_library( # Sets the name of the path variable.log-lib# Specifies the name of the NDK library that# you want CMake to locate.log)# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in this
# build script, prebuilt third-party libraries, or system libraries.target_link_libraries( # Specifies the target library.speex-lib# Links the target library to the log library# included in the NDK.${log-lib})

在gradle下：

    defaultConfig {...externalNativeBuild {cmake {cppFlags "-std=c++11 -frtti"abiFilters 'armeabi-v7a', "arm64-v8a", 'x86', 'x86_64'arguments "-DANDROID_TOOLCHAIN=clang", "-DANDROID_STL=c++_static"}}}

android {externalNativeBuild {cmake {path "src/main/cpp/CMakeLists.txt"version "3.10.2"}}
}

若使用Android.mk：

LOCAL_PATH := $(call my-dir)include $(CLEAR_VARS)
LOCAL_LDLIBS :=-llogLOCAL_MODULE    := libspeex
LOCAL_CFLAGS = -DFIXED_POINT -DUSE_KISS_FFT -DEXPORT="" -UHAVE_CONFIG_H
LOCAL_C_INCLUDES := $(LOCAL_PATH)/includeLOCAL_SRC_FILES := speex_jni.cpp \./libspeex/bits.c \./libspeex/cb_search.c \./libspeex/buffer.c \./libspeex/exc_10_16_table.c \./libspeex/exc_10_32_table.c \./libspeex/exc_20_32_table.c \./libspeex/exc_5_256_table.c \./libspeex/exc_5_64_table.c \./libspeex/exc_8_128_table.c \./libspeex/fftwrap.c \./libspeex/filterbank.c \./libspeex/filters.c \./libspeex/gain_table_lbr.c \./libspeex/gain_table.c \./libspeex/hexc_10_32_table.c \./libspeex/hexc_table.c \./libspeex/high_lsp_tables.c \./libspeex/jitter.c \./libspeex/kiss_fft.c \./libspeex/kiss_fftr.c \./libspeex/lpc.c \./libspeex/lsp_tables_nb.c \./libspeex/lsp.c \./libspeex/ltp.c \./libspeex/mdf.c \./libspeex/modes_wb.c \./libspeex/modes.c \./libspeex/nb_celp.c \./libspeex/preprocess.c \./libspeex/quant_lsp.c \./libspeex/sb_celp.c \./libspeex/scal.c \./libspeex/smallft.c \./libspeex/speex_callbacks.c \./libspeex/speex_header.c \./libspeex/speex.c \./libspeex/stereo.c \./libspeex/vbr.c \./libspeex/vorbis_psy.c \./libspeex/vq.c \./libspeex/window.c \include $(BUILD_SHARED_LIBRARY)

application.mk

APP_ABI := armeabi

gradle也不一样：

android{externalNativeBuild {ndkBuild {path 'src/main/cpp/Android.mk'}}
}

speex_jni.cpp

#include <jni.h>#include <string.h>
#include <unistd.h>#include <speex/speex.h>
#include<Android/log.h>
static int codec_open = 0;static int dec_frame_size;
static int enc_frame_size;static SpeexBits ebits, dbits;
void *enc_state;
void *dec_state;static JavaVM *gJavaVM;
#define TAG "JNI" // 这个是自定义的LOG的标识
#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG, TAG ,__VA_ARGS__) // 定义LOGD类型
extern "C"
JNIEXPORT jint JNICALL Java_包名_NativeCodec_open(JNIEnv *env, jobject obj, jint compression) {int tmp;if (codec_open++ != 0)return (jint)0;speex_bits_init(&ebits);speex_bits_init(&dbits);enc_state = speex_encoder_init(&speex_nb_mode);dec_state = speex_decoder_init(&speex_nb_mode);tmp = compression;speex_encoder_ctl(enc_state, SPEEX_SET_QUALITY, &tmp);speex_encoder_ctl(enc_state, SPEEX_GET_FRAME_SIZE, &enc_frame_size);speex_decoder_ctl(dec_state, SPEEX_GET_FRAME_SIZE, &dec_frame_size);return (jint)0;
}
float encoder_input[160];
extern "C"
JNIEXPORT jint Java_包名_NativeCodec_encode(JNIEnv *env, jobject obj, jshortArray lin, jint offset, jbyteArray encoded, jint size) {jshort buffer[enc_frame_size];jbyte output_buffer[20];int nsamples = (size-1)/enc_frame_size + 1;int i, tot_bytes = 0;if (!codec_open)return 0;speex_bits_reset(&ebits);for (i = 0; i < nsamples; i++) {env->GetShortArrayRegion(lin, offset + i*enc_frame_size, enc_frame_size, buffer);speex_encode_int(enc_state, buffer, &ebits);}//env->GetShortArrayRegion(lin, offset, enc_frame_size, buffer);//speex_encode_int(enc_state, buffer, &ebits);tot_bytes = speex_bits_write(&ebits, (char *)output_buffer,enc_frame_size);env->SetByteArrayRegion(encoded, 0, tot_bytes,output_buffer);return (jint)tot_bytes;
}extern "C"
JNIEXPORT jint JNICALL Java_包名_NativeCodec_decode(JNIEnv *env, jobject obj, jbyteArray encoded, jshortArray lin, jint size) {jbyte buffer[dec_frame_size];jshort output_buffer[dec_frame_size];jsize encoded_length = size;if (!codec_open)return 0;speex_bits_reset(&dbits);env->GetByteArrayRegion(encoded, 0, encoded_length, buffer);speex_bits_read_from(&dbits, (char *)buffer, encoded_length);
//    speex_decode_int(dec_state, &dbits, output_buffer);float decoder_output[dec_frame_size];speex_decode(dec_state, &dbits, decoder_output);for (int i = 0; i < dec_frame_size; i++){output_buffer[i] = decoder_output[i];}env->SetShortArrayRegion(lin, 0, dec_frame_size,output_buffer);return (jint)dec_frame_size;
}extern "C"
JNIEXPORT jint JNICALL Java_包名_NativeCodec_getFrameSize(JNIEnv *env, jobject obj) {if (!codec_open)return 0;return (jint)enc_frame_size;}extern "C"
JNIEXPORT void JNICALL Java_包名_NativeCodec_close(JNIEnv *env, jobject obj) {if (--codec_open != 0)return;speex_bits_destroy(&ebits);speex_bits_destroy(&dbits);speex_decoder_destroy(dec_state);speex_encoder_destroy(enc_state);
}

public native int open(int compression);public native int getFrameSize();public native int decode(byte encoded[], short lin[], int size);public native int encode(short lin[], int offset, byte encoded[], int size);public native void close();

解码参数 1 encodedData, 编码数据2 decodedData, 解码数据，可通过getFrameSize获取长度3 encodedData.length

编码参数1 audioData,原始参数

2 0

3 encodedData,

4 audioData.length

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