speex编解码在android上实现
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1、去Speex官网下载最新Speex源码。
2、创建新的android工程,并创建jni文件夹。
3、把speex源码目录下的libspeex和include目录及其子目录文件全部拷贝到$project/jni目录下。
4、在jni目录下新增Android.mk文件,编辑内容如下:
- 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 :=\
- libspeex/bits.c \
- libspeex/buffer.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/fftwrap.c \
- libspeex/filterbank.c \
- libspeex/filters.c \
- libspeex/gain_table.c \
- libspeex/gain_table_lbr.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.c \
- libspeex/lsp_tables_nb.c \
- libspeex/ltp.c \
- libspeex/mdf.c \
- libspeex/modes.c \
- libspeex/modes_wb.c \
- libspeex/nb_celp.c \
- libspeex/preprocess.c \
- libspeex/quant_lsp.c \
- libspeex/resample.c \
- libspeex/sb_celp.c \
- libspeex/scal.c \
- libspeex/smallft.c \
- libspeex/speex.c \
- libspeex/speex_callbacks.c \
- libspeex/speex_header.c \
- libspeex/stereo.c \
- libspeex/vbr.c \
- libspeex/vq.c \
- libspeex/window.c \
- speex_jni.cpp \
- include $(BUILD_SHARED_LIBRARY)
5.在jni目录下新增Application.mk文件,编辑内容如下
- APP_ABI := armeabi armeabi-v7a
6.在$project/jni/include/speex/目录下新增speex_config_types.h文件,编辑内容如下
- 01.#ifndef __SPEEX_TYPES_H__
- 02.#define __SPEEX_TYPES_H__
- 03.typedef short spx_int16_t;
- 04.typedef unsigned short spx_uint16_t;
- 05.typedef int spx_int32_t;
- 06.typedef unsigned int spx_uint32_t;
- 07.#endif
7.创建JNI包装类speex_jni.cpp,用来调用Speex中的C代码函数,编辑内容如下
- #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_trunkbow_speextest_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 Java_com_trunkbow_speextest_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);
- }
- //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_com_trunkbow_speextest_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_trunkbow_speextest_Speex_getFrameSize
- (JNIEnv *env, jobject obj) {
- if (!codec_open)
- return 0;
- return (jint)enc_frame_size;
- }
- extern "C"
- JNIEXPORT void JNICALL Java_com_trunkbow_speextest_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);
- }
8.在Java层创建Speex工具类,内容如下:
- package com.trunkbow.speextest;
- 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 = 8;
- 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();
- }
9、使用cygwin编译,生成so文件。
***********************************************************************
* 转载于:http://blog.csdn.net/xyz_lmn
* 作者:张兴业
* 邮箱:xy-zhang@163.com
***********************************************************************
参考:
http://code.google.com/p/android-recorder/downloads/list 这个是一个android recorder ,使用speex编码,
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