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移植、验证AAC解码库FAAD2到android详解必看

2016-07-23 14:52 501 查看

aac是针对音频进行压缩的一种算法该编码优点很多。音质好支持的采样率声道都很多。在Android上使用非常常见

之前使用ffmepeg 1.1的decode_audio4这个函数解码有误双声道16位居然解码成单声道32位（nb_sample_fm=8）

没找到好的解决方法（据说换老版本的ffmpeg0.5可以解决）

之后有尝试提炼opcore 中的aac decode 发现太复杂

再之后尝试使用OPSLes 但是居然在源代码里面有个结构体定义的bug 导致无法编译不得不移植faad2

整个过程：1：下载源代码
2：使用NDK编译

3：编写JNI测试函数，使用aac文件测试效果。

1：http://www.audiocoding.com/downloads.html 下载2.7

FAAD2 Source

Version 2.7 ZIP Package

到一个android工程下新建一个jni目录解压到此处
目录结构

---jni

|---faad2

|-----aacDe

|----libfaad

.

.

.

我们之关心libfaad 和include这两个文件夹

2：编写mk脚本

在jni目录下编写Android.mk文件，内容如下

[java]
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LOCAL_PATH := $(call my-dir)
FAAD2_TOP := $(LOCAL_PATH)/faad2
include $(CLEAR_VARS)
include $(FAAD2_TOP)/libfaad/Android.mk

LOCAL_C_INCLUDES := \
 $(LOCAL_PATH) \
 $(FAAD2_TOP)/android \
 $(FAAD2_TOP)/include \
 $(LOCAL_PATH)/codebook

在/jni/faad2/libfaad/编写Android.mk 内容如下

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LOCAL_PATH:= $(call my-dir)

include $(CLEAR_VARS)

LOCAL_SRC_FILES:=bits.c \
 cfft.c \
 decoder.c \
 drc.c \
 drm_dec.c \
 error.c \
 filtbank.c \
 ic_predict.c \
 is.c \
 lt_predict.c \
 mdct.c \
 mp4.c \
 ms.c \
 output.c \
 pns.c \
 ps_dec.c \
 ps_syntax.c \
 pulse.c \
 specrec.c \
 syntax.c \
 tns.c \
 hcr.c \
 huffman.c \
 rvlc.c \
 ssr.c \
 ssr_fb.c \
 ssr_ipqf.c \
 common.c \
 sbr_dct.c \
 sbr_e_nf.c \
 sbr_fbt.c \
 sbr_hfadj.c \
 sbr_hfgen.c \
 sbr_huff.c \
 sbr_qmf.c \
 sbr_syntax.c \
 sbr_tf_grid.c \
 sbr_dec.c


LOCAL_MODULE:=faad
LOCAL_C_INCLUDES := \
 $(LOCAL_PATH) \
 $(FAAD2_TOP)/android \
 $(FAAD2_TOP)/include \
 $(LOCAL_PATH)/codebook

LOCAL_CFLAGS:= \
 -DHAVE_CONFIG_H

include $(BUILD_SHARED_LIBRARY)

最后在/jnifaad/下面编写config.h文件

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/* config.h. Generated from config.h.in by configure. */
/* config.h.in. Generated from configure.in by autoheader. */

/* Define if you want to use libfaad together with Digital Radio Mondiale
 (DRM) */
/* #undef DRM */

/* Define if you want support for Digital Radio Mondiale (DRM) parametric
 stereo */
/* #undef DRM_PS */

/* Define to 1 if you have the <dlfcn.h> header file. */
#define HAVE_DLFCN_H 1

/* Define to 1 if you have the <errno.h> header file. */
#define HAVE_ERRNO_H 1

/* Define if needed */
/* #undef HAVE_FLOAT32_T */

/* Define to 1 if you have the <float.h> header file. */
#define HAVE_FLOAT_H 1

/* Define to 1 if you have the `getpwuid' function. */
#define HAVE_GETPWUID 1

/* Define to 1 if you have the <inttypes.h> header file. */
#define HAVE_INTTYPES_H 1

/* Define if you have the IOKit API */
/* #undef HAVE_IOKIT_IOKITLIB_H */

/* Define to 1 if you have the <limits.h> header file. */
#define HAVE_LIMITS_H 1

/* Define if you have C99's lrintf function. */
#define HAVE_LRINTF 1

/* Define to 1 if you have the <mathf.h> header file. */
/* #undef HAVE_MATHF_H */

/* Define to 1 if you have the `memcpy' function. */
#define HAVE_MEMCPY 1

/* Define to 1 if you have the <memory.h> header file. */
#define HAVE_MEMORY_H 1

/* Define to 1 if you have the <stdint.h> header file. */
#define HAVE_STDINT_H 1

/* Define to 1 if you have the <stdlib.h> header file. */
#define HAVE_STDLIB_H 1

/* Define to 1 if you have the `strchr' function. */
#define HAVE_STRCHR 1

/* Define to 1 if you have the <strings.h> header file. */
#define HAVE_STRINGS_H 1

/* Define to 1 if you have the <string.h> header file. */
#define HAVE_STRING_H 1

/* Define to 1 if you have the `strsep' function. */
#define HAVE_STRSEP 1

/* Define to 1 if you have the <sysfs/libsysfs.h> header file. */
/* #undef HAVE_SYSFS_LIBSYSFS_H */

/* Define to 1 if you have the <sys/stat.h> header file. */
#define HAVE_SYS_STAT_H 1

/* Define to 1 if you have the <sys/time.h> header file. */
#define HAVE_SYS_TIME_H 1

/* Define to 1 if you have the <sys/types.h> header file. */
#define HAVE_SYS_TYPES_H 1

/* Define to 1 if you have the <unistd.h> header file. */
#define HAVE_UNISTD_H 1

/* Define to 1 if your C compiler doesn't accept -c and -o together. */
/* #undef NO_MINUS_C_MINUS_O */

/* Name of package */
#define PACKAGE "faad2"

/* Define to the address where bug reports for this package should be sent. */
#define PACKAGE_BUGREPORT ""

/* Define to the full name of this package. */
#define PACKAGE_NAME ""

/* Define to the full name and version of this package. */
#define PACKAGE_STRING ""

/* Define to the one symbol short name of this package. */
#define PACKAGE_TARNAME ""

/* Define to the version of this package. */
#define PACKAGE_VERSION ""

/* Define to 1 if you have the ANSI C header files. */
#define STDC_HEADERS 1

/* Define to 1 if you can safely include both <sys/time.h> and <time.h>. */
#define TIME_WITH_SYS_TIME 1

/* Version number of package */
#define VERSION "2.7.0"

/* Define to 1 if your processor stores words with the most significant byte
 first (like Motorola and SPARC, unlike Intel and VAX). */
/* #undef WORDS_BIGENDIAN */

/* Define to `__inline__' or `__inline' if that's what the C compiler
 calls it, or to nothing if 'inline' is not supported under any name. */
#ifndef __cplusplus
/* #undef inline */
#endif

/* Define to `long int' if <sys/types.h> does not define. */
/* #undef off_t */

使用NDK 命令 ndk-build(我的版本为ndk-linux-x64-r8)
如果没有问题会在/libs/下面生成一个libfaad2.a文件没错就是一个静态库为什么是静态库看下面

如果运行NDK编译命令没有动静则在/jni/目录下编译个Application.mk文件

[java]
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APP_STL:= gnustl_static
APP_ABI := armeabi-v7a
APP_PLATFORM := android-14
APP_MODULES := libfaad

上面语句的意思
第一行用GNU库

第二行针对arme-v7a的CPU

第三行针对设备的版本 4.0.3

最后一行静态库的名称

能用的库就出来了然后怎么调用它呢？

JNI技术

修改jni/Android.mk如下

[java]
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LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
LOCAL_MODULE := libfaad
LOCAL_SRC_FILES := lib/libfaad.a
include $(PREBUILT_STATIC_LIBRARY)

LOCAL_C_INCLUDES := $(LOCAL_PATH)/ \
 $(call include-path-for, wilhelm)
LOCAL_MODULE := pcmNativePlayer

LOCAL_LDLIBS := -L$(NDK_PLATFORMS_ROOT)/$(TARGET_PLATFORM)/arch-arm/usr/lib -L$(LOCAL_PATH)
LOCAL_LDLIBS += -lOpenSLES -llog -lz -ldl
#-ljnigraphics -cpu -lgcc
LOCAL_SRC_FILES := decode_aac_adts.cpp

[java]
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#native-audio-jni.cpp
LOCAL_STATIC_LIBRARIES:= libfaad
LOCAL_SHARED_LIBRARIES := \
 libutils \
 libOpenSLES
include $(BUILD_SHARED_LIBRARY)

然后编写一个/jni/decode_aac_adts.cpp

[cpp]
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/**
* faaddec.c
* use faad library to decode AAC, only can decode frame with ADTS head
*/
#include <stdio.h>
#include <memory.h>

extern "C"{
#include "faad.h"
#include "neaacdec.h"
}
#include <jni.h>

//#include "native-audio-jni.h"
#include <stdio.h>
#include <stdlib.h>
#include <android/log.h>
#define LOG_TAG "faad2_decode_aac_adts"
#define LOGI(...) __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)
#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)
#define LOGW(...) __android_log_print(ANDROID_LOG_WARN,LOG_TAG,__VA_ARGS__)
#define FRAME_MAX_LEN 1024*5
#define BUFFER_MAX_LEN 1024*1024
void show_usage()
{
 LOGI("usage\nfaaddec src_file dst_file");
}

/**
* fetch one ADTS frame
*/
int get_one_ADTS_frame(unsigned char* buffer, size_t buf_size,
 unsigned char* data, size_t* data_size)
{
 size_t size = 0;

 if (!buffer || !data || !data_size)
 {
 return -1;
 }

 while (1)
 {
 if (buf_size < 7)
 {
 return -1;
 }

 if ((buffer[0] == 0xff) && ((buffer[1] & 0xf0) == 0xf0))
 {
 size |= ((buffer[3] & 0x03) << 11); //high 2 bit
 size |= buffer[4] << 3; //middle 8 bit
 size |= ((buffer[5] & 0xe0) >> 5); //low 3bit
 break;
 }
 --buf_size;
 ++buffer;
 }

 if (buf_size < size)
 {
 return -1;
 }

 memcpy(data, buffer, size);
 *data_size = size;

 return 0;
}

int main2(int argc, char* argv[])
{
 static unsigned char frame[FRAME_MAX_LEN];
 static unsigned char buffer[BUFFER_MAX_LEN] =
 { 0 };

 char src_file[128] =
 { 0 };
 char dst_file[128] =
 { 0 };
 FILE* ifile = NULL;
 FILE* ofile = NULL;

 unsigned long samplerate;
 unsigned char channels;
 NeAACDecHandle decoder = 0;

 size_t data_size = 0;
 size_t size = 0;

 NeAACDecFrameInfo frame_info;
 unsigned char* input_data = buffer;
 unsigned char* pcm_data = NULL;

 //analyse parameter
 if (argc < 3)
 {
 show_usage();
 return -1;
 }
 sscanf(argv[1], "%s", src_file);
 sscanf(argv[2], "%s", dst_file);
 LOGI("source file is null%s",argv[1]);
 LOGI("dst file is null%s",argv[2]);
 ifile = fopen(src_file, "rb");
 ofile = fopen(dst_file, "wb");
 if (!ifile || !ofile)
 {
 LOGI("source or destination file is null");
 return -1;
 }

 data_size = fread(buffer, 1, BUFFER_MAX_LEN, ifile);

 //open decoder
 decoder = NeAACDecOpen();
 if (get_one_ADTS_frame(buffer, data_size, frame, &size) < 0)
 {
 return -1;
 }

 //initialize decoder
 NeAACDecInit(decoder, frame, size, &samplerate, &channels);
 LOGI("samplerate %d, channels %d\n", samplerate, channels);

 while (get_one_ADTS_frame(input_data, data_size, frame, &size) == 0)
 {
 // LOGI("frame size %d\n", size);

 //decode ADTS frame
 pcm_data = (unsigned char*) NeAACDecDecode(decoder, &frame_info, frame,
 size);

 if (frame_info.error > 0)
 {
 LOGI("%s\n", NeAACDecGetErrorMessage(frame_info.error));

 }
 else if (pcm_data && frame_info.samples > 0)
 {
 LOGI(
 "frame info: bytesconsumed %d, channels %d, header_type %d\
 object_type %d, samples %d, samplerate %d\n",
 frame_info.bytesconsumed, frame_info.channels,
 frame_info.header_type, frame_info.object_type,
 frame_info.samples, frame_info.samplerate);
 //put openSL queue to render
 //updateAudioData(pcm_data,frame_info.samples * frame_info.channels,0);
 fwrite(pcm_data, 1, frame_info.samples * frame_info.channels,
 ofile); //2个通道
 fflush(ofile);
 }
 data_size -= size;
 input_data += size;
 }

 NeAACDecClose(decoder);

 fclose(ifile);
 fclose(ofile);
 return 0;
}
extern "C"
{
jint Java_org_gl_jni_JNI_fileBackPlay(JNIEnv* env, jobject thiz,
 jstring filepath, jint fileRealLength)
{
// if (stats == stats_ING)
// {
// LOGE( "is playing");
// return stats;
// }
 char * fileName = (char*) (env)->GetStringUTFChars(filepath, NULL);
 LOGI( "fileName:%s", fileName);
 char* files[3] ;
 files[0] = "0";
 files[1] = fileName;
 files[2] = "/sdcard/pcm_faac_out";
 main2(4,files);
 env->ReleaseStringUTFChars(filepath, fileName);
 return 0;
}
}

将位于/libs/faad2.a移动到/jni/lib/下面

再一次运行ndk-build编译出一个动态库 faad2.so
编译工作完成

编写测试函数

细节不多说

java代码 src/org/gl/jni/JNI.java

[java]
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package org.gl.jni;

public class JNI {

 static {
 System.loadLibrary("faad");
 }

 public static native int fileBackPlay(String fileName);
}

[java]
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调用代码如下 <pre name="code" class="java"> new Thread() {
 public void run() {
 try {
 JNI.fileBackPlay("/sdcard/test1.aac");
 } catch (Exception e) {
 // TODO: handle exception
 }
 };
 }.start();</pre> 
<pre></pre>

完成后会在sdcard下面产生一个PCM格式的输出文件 <pre name="code" class="cpp">/sdcard/pcm_faac_out</pre>
拿出来在windows下面用cooledit播放一下。具体参数跟下面调用函数中的文件的编码设置有关
AAC格式编码介绍：AAC编码就是将PCMGE格式的音频信号压缩有利于网络传输和存储
pcm：声音模拟信号数字化后的数据
 


 

<pre></pre>


由于最近要做AAC解码，查看了网上最初有两种思路：第一章种是ffmpeg，我查看./configure --list-decoders的时候，有看到aac解码器，同时在x86上编译也能够打开aac解码器，但是用用ndk交叉编译的时候即使--enable-decoder=aac也没有打开AAC解码器，所以这种方法暂停。第二中方法是使用faad2解码，在x86上调试，写一个demo能够解码aac，然后就是交叉编译，也得到库，所以就使用第二种方法。在这里记录下来，帮助解码AAC的同仁。

1、到官网http://www.audiocoding.com/downloads.html 下载faad,当前的版本是2.7，

2、创建一个文件夹AACDecoder,进入AACDecoder

3、将下载的faad加压，并且重新命名为jni

4、然后就是创建Android.mk, Application.mk，首先在jni目录下面创建Android.mk

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LOCAL_PATH := $(call my-dir)

FAAD2_TOP := $(LOCAL_PATH)

include $(CLEAR_VARS)

include $(FAAD2_TOP)/libfaad/Android.mk

然后就是Application.mk,当然不创建Application.mk也没有问题

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APP_ABI := armeabi

5.创建config.h

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/* config.h. Generated from config.h.in by configure. */
/* config.h.in. Generated from configure.in by autoheader. */

/* Define if you want to use libfaad together with Digital Radio Mondiale
 (DRM) */
/* #undef DRM */

/* Define if you want support for Digital Radio Mondiale (DRM) parametric
 stereo */
/* #undef DRM_PS */

/* Define to 1 if you have the <dlfcn.h> header file. */
#define HAVE_DLFCN_H 1

/* Define to 1 if you have the <errno.h> header file. */
#define HAVE_ERRNO_H 1

/* Define if needed */
/* #undef HAVE_FLOAT32_T */

/* Define to 1 if you have the <float.h> header file. */
#define HAVE_FLOAT_H 1

/* Define to 1 if you have the `getpwuid' function. */
#define HAVE_GETPWUID 1

/* Define to 1 if you have the <inttypes.h> header file. */
#define HAVE_INTTYPES_H 1

/* Define if you have the IOKit API */
/* #undef HAVE_IOKIT_IOKITLIB_H */

/* Define to 1 if you have the <limits.h> header file. */
#define HAVE_LIMITS_H 1

/* Define if you have C99's lrintf function. */
#define HAVE_LRINTF 1

/* Define to 1 if you have the <mathf.h> header file. */
/* #undef HAVE_MATHF_H */

/* Define to 1 if you have the `memcpy' function. */
#define HAVE_MEMCPY 1

/* Define to 1 if you have the <memory.h> header file. */
#define HAVE_MEMORY_H 1

/* Define to 1 if you have the <stdint.h> header file. */
#define HAVE_STDINT_H 1

/* Define to 1 if you have the <stdlib.h> header file. */
#define HAVE_STDLIB_H 1

/* Define to 1 if you have the `strchr' function. */
#define HAVE_STRCHR 1

/* Define to 1 if you have the <strings.h> header file. */
#define HAVE_STRINGS_H 1

/* Define to 1 if you have the <string.h> header file. */
#define HAVE_STRING_H 1

/* Define to 1 if you have the `strsep' function. */
#define HAVE_STRSEP 1

/* Define to 1 if you have the <sysfs/libsysfs.h> header file. */
/* #undef HAVE_SYSFS_LIBSYSFS_H */

/* Define to 1 if you have the <sys/stat.h> header file. */
#define HAVE_SYS_STAT_H 1

/* Define to 1 if you have the <sys/time.h> header file. */
#define HAVE_SYS_TIME_H 1

/* Define to 1 if you have the <sys/types.h> header file. */
#define HAVE_SYS_TYPES_H 1

/* Define to 1 if you have the <unistd.h> header file. */
#define HAVE_UNISTD_H 1

/* Define to 1 if your C compiler doesn't accept -c and -o together. */
/* #undef NO_MINUS_C_MINUS_O */

/* Name of package */
#define PACKAGE "faad2"

/* Define to the address where bug reports for this package should be sent. */
#define PACKAGE_BUGREPORT ""

/* Define to the full name of this package. */
#define PACKAGE_NAME ""

/* Define to the full name and version of this package. */
#define PACKAGE_STRING ""

/* Define to the one symbol short name of this package. */
#define PACKAGE_TARNAME ""

/* Define to the version of this package. */
#define PACKAGE_VERSION ""

/* Define to 1 if you have the ANSI C header files. */
#define STDC_HEADERS 1

/* Define to 1 if you can safely include both <sys/time.h> and <time.h>. */
#define TIME_WITH_SYS_TIME 1

/* Version number of package */
#define VERSION "2.7.0"

/* Define to 1 if your processor stores words with the most significant byte
 first (like Motorola and SPARC, unlike Intel and VAX). */
/* #undef WORDS_BIGENDIAN */

/* Define to `__inline__' or `__inline' if that's what the C compiler
 calls it, or to nothing if 'inline' is not supported under any name. */
#ifndef __cplusplus
/* #undef inline */
#endif

/* Define to `long int' if <sys/types.h> does not define. */
/* #undef off_t */

6.进入libfaad文件夹下面创建Android.mk

[java]
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LOCAL_PATH:= $(call my-dir)

include $(CLEAR_VARS)

LOCAL_SRC_FILES:= \
 bits.c \
 cfft.c \
 decoder.c \
 drc.c \
 drm_dec.c \
 error.c \
 filtbank.c \
 ic_predict.c \
 is.c \
 lt_predict.c \
 mdct.c \
 mp4.c \
 ms.c \
 output.c \
 pns.c \
 ps_dec.c \
 ps_syntax.c \
 pulse.c \
 specrec.c \
 syntax.c \
 tns.c \
 hcr.c \
 huffman.c \
 rvlc.c \
 ssr.c \
 ssr_fb.c \
 ssr_ipqf.c \
 common.c \
 sbr_dct.c \
 sbr_e_nf.c \
 sbr_fbt.c \
 sbr_hfadj.c \
 sbr_hfgen.c \
 sbr_huff.c \
 sbr_qmf.c \
 sbr_syntax.c \
 sbr_tf_grid.c \
 sbr_dec.c

LOCAL_MODULE:= libfaad

LOCAL_C_INCLUDES := \
 $(LOCAL_PATH) \
 $(FAAD2_TOP)/android \
 $(FAAD2_TOP)/include \
 $(LOCAL_PATH)/codebook

LOCAL_CFLAGS:= \
 -DHAVE_CONFIG_H

include $(BUILD_SHARED_LIBRARY)

7、在jni目录下面运行ndk-build
8、运行结果如下：

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root@zhangjie:/home/AACDecoder/jni# ndk-build
Compile thumb : faad <= bits.c
Compile thumb : faad <= cfft.c
Compile thumb : faad <= decoder.c
Compile thumb : faad <= drc.c
Compile thumb : faad <= drm_dec.c
Compile thumb : faad <= error.c
Compile thumb : faad <= filtbank.c
Compile thumb : faad <= ic_predict.c
Compile thumb : faad <= is.c
Compile thumb : faad <= lt_predict.c
Compile thumb : faad <= mdct.c
Compile thumb : faad <= mp4.c
Compile thumb : faad <= ms.c
Compile thumb : faad <= output.c
Compile thumb : faad <= pns.c
Compile thumb : faad <= ps_dec.c
Compile thumb : faad <= ps_syntax.c
Compile thumb : faad <= pulse.c
Compile thumb : faad <= specrec.c
Compile thumb : faad <= syntax.c
Compile thumb : faad <= tns.c
Compile thumb : faad <= hcr.c
Compile thumb : faad <= huffman.c
Compile thumb : faad <= rvlc.c
Compile thumb : faad <= ssr.c
Compile thumb : faad <= ssr_fb.c
Compile thumb : faad <= ssr_ipqf.c
Compile thumb : faad <= common.c
Compile thumb : faad <= sbr_dct.c
Compile thumb : faad <= sbr_e_nf.c
Compile thumb : faad <= sbr_fbt.c
Compile thumb : faad <= sbr_hfadj.c
Compile thumb : faad <= sbr_hfgen.c
Compile thumb : faad <= sbr_huff.c
Compile thumb : faad <= sbr_qmf.c
Compile thumb : faad <= sbr_syntax.c
Compile thumb : faad <= sbr_tf_grid.c
Compile thumb : faad <= sbr_dec.c
SharedLibrary : libfaad.so
Install : libfaad.so => libs/armeabi/libfaad.so

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