x264在Android平台上的移植
gedit ~/.bashrc
将 /opt/android-sdk-linux/tools 添加到 "PATH"环境变量中
将 /opt/android-ndk-r8b 添加到 "PATH"环境变量中
将x264源码包last_x264.tar.bz2下载到~/x264-android目录下，并解压到目录~/x264-android/x264-snapshot-20130808-2245/下
cd ~/x264-android/x264-snapshot-20130808-2245
执行以下配置脚本：
./configure --enable-pic --enable-strip --enable-static --cross-prefix=/opt/android-ndk-r8b/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/arm-linux-androideabi- --sysroot=/opt/android-ndk-r8b/platforms/android-14/arch-arm --host=arm-linux --prefix=./build --extra-cflags="-march=armv7-a -mtune=cortex-a8 -mfloat-abi=softfp -mfpu=neon -D__ARM_ARCH_7__ -D__ARM_ARCH_7A__"
然后：make
最后：在当前目录下生成libx264.a的静态库
注：最好用android-ndk-r8b之前的ndk版本（包括android-ndk-r8b）编译，android-ndk-r8b之后的版本编译x264，最后会报"cannot scan executable section 1 of libx264.a(dct-a.o) for Cortex-A8 erratum because it has no mapping symbols"的警告
x264在android平台上的使用
1、创建工程x264_android
android list targets
android create project --target 1 --name x264_android --path ~/workspace/x264_android --package com.modukaikai.x264 --activity x264Activity
2、copy x264的库和头文件到jni目录
mkdir ~/workspace/x264_android/jni
mkdir ~/workspace/x264_android/jni/x264
cp ~/x264-android/x264-snapshot-20130808-2245/libx264.a ~/workspace/x264_android/jni/x264
cp ~/x264-android/x264-snapshot-20130808-2245/x264.h ~/workspace/x264_android/jni/x264
cp ~/x264-android/x264-snapshot-20130808-2245/x264_config.h ~/workspace/x264_android/jni/x264
3、创建x264encoder类封装x264的调用接口
以下是x264encoder.h(放在jni目录下)
#ifndef x264encoder_h
#define x264encoder_h
extern "C"
{
#include "stdint.h"
#include "x264.h"
enum bitrate_level
{
HIGH_LEVEL = 0,
STANDARD_LEVEL = 1,
MEDIUM_LEVEL = 2,
LOW_LEVEL = 3,
};
class X264Encoder
{
public:
X264Encoder();
~X264Encoder();
bool openX264Encoder();
// long x264EncoderProcess(uint8_t *pSrcData, int srcDataSize, x264_nal_t **nals, int& nalsCount);
long x264EncoderProcess(x264_picture_t *pPicture, x264_nal_t **nals, int& nalsCount);
bool closeX264Encoder();
void setSourceFormat(unsigned int sourcformat);
void setResolution(unsigned int w, unsigned int h);
void setBitrate(unsigned int i_bitrate);
void setFps(unsigned int fps);
void setI_KeyInt_Max(unsigned int i_frame_max);
void setQp_Max(unsigned int qp_max);
void setQp_Min(unsigned int qp_min);
void forceIDRFrame();
void upgradeBitrateLevel();
void declineBitrateLevel();
void setLeastBitrateLevel();
private:
x264_param_t *pParameter;
x264_t *x264EncoderHandle;
// x264_picture_t *pPicture;
x264_picture_t *pOutput;
unsigned int sourceFormat;
// unsigned int i_bitrate;
unsigned int bitratelevel;
unsigned int i_fps;
unsigned int i_keyint_max;
unsigned int width;
unsigned int height;
unsigned int qp_max;
unsigned int qp_min;
unsigned int current_f_rf_constant;
unsigned int userSetting_f_rf_constant;
int64_t frameNo;
bool isForceIDRFrameEnabled;
};
}
#endif
以下是x264encoder.cpp(放在jni目录下)