speex编译

首先去官网 

https://www.speex.org/downloads/

下载解压

将include、libspeex文件夹复制到自己新建工程的jni目录下

speex有关的类

package com.speex.lib;

public class Speex {

    /* quality
     * 1 : 4kbps (very noticeable artifacts, usually intelligible)
     * 2 : 6kbps (very noticeable artifacts, good intelligibility)
     * 4 : 8kbps (noticeable artifacts sometimes)
     * 6 : 11kpbs (artifacts usually only noticeable with headphones)
     * 8 : 15kbps (artifacts not usually noticeable)
     */
    private static final int DEFAULT_COMPRESSION = 4;

    public Speex() {
    }

    public void init() {
        load();    
        open(DEFAULT_COMPRESSION);
    }
    
    private void load() {
        try {
            System.loadLibrary("speex");
        } catch (Throwable e) {
            e.printStackTrace();
        }

    }

    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();
    
}

对应的C的源码speex_jni.cpp的源码

////

#include <jni.h>

#include <string.h>
#include <unistd.h>

#include <speex/speex.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;

extern "C"
JNIEXPORT jint JNICALL Java_com_speex_lib_Speex_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;
}

extern "C"
JNIEXPORT jint JNICALL Java_com_speex_lib_Speex_encode
        (JNIEnv *env, jobject obj, jshortArray lin, jint offset, jbyteArray encoded, jint size) {

    jshort buffer[enc_frame_size];
    jbyte output_buffer[enc_frame_size];
    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);
    }

    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_com_speex_lib_Speex_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;

    env->GetByteArrayRegion(encoded, 0, encoded_length, buffer);
    speex_bits_read_from(&dbits, (char *)buffer, encoded_length);
    speex_decode_int(dec_state, &dbits, output_buffer);
    env->SetShortArrayRegion(lin, 0, dec_frame_size,
                             output_buffer);

    return (jint)dec_frame_size;
}

extern "C"
JNIEXPORT jint JNICALL Java_com_speex_lib_Speex_getFrameSize
        (JNIEnv *env, jobject obj) {

    if (!codec_open)
        return 0;
    return (jint)enc_frame_size;

}

extern "C"
JNIEXPORT void JNICALL Java_com_speex_lib_Speex_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);
}

在jni目录下新增Android.mk文件，复制如下内容，Android.mk中记录了待编译的源文件的路

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE    := libspeex
LOCAL_CFLAGS = -DFIXED_POINT -DUSE_KISS_FFT -DEXPORT="" -UHAVE_CONFIG_H
LOCAL_C_INCLUDES := $(LOCAL_PATH)/include

#LOCAL_SRC_FILES :=  
LOCAL_SRC_FILES :=speex_jni.cpp 
        ./libspeex/bits.c 
        ./libspeex/cb_search.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/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/kiss_fft.c 
        ./libspeex/kiss_fftr.c 
        ./libspeex/lpc.c 
        ./libspeex/lsp_tables_nb.c 
        ./libspeex/lsp.c 
        ./libspeex/ltp.c 
        ./libspeex/modes_wb.c 
        ./libspeex/modes.c 
        ./libspeex/nb_celp.c 
        ./libspeex/quant_lsp.c 
        ./libspeex/sb_celp.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)

在jni下创建Application.mk，并添加如下内容，编译所有平台下的so文件

APP_ABI := all

在jni/include/speex/目录下新增speex_config_types.h文件，复制内容如下

#ifndef __SPEEX_TYPES_H__  
#define __SPEEX_TYPES_H__  
  
typedef short spx_int16_t;  
typedef unsigned short spx_uint16_t;  
typedef int spx_int32_t;  
typedef unsigned int spx_uint32_t;  
  
#endif  

在命令行输入ndk-build

开始编译

在libs目录下面生成