x264在Android平台上的編譯和使用

x264在Android平台上的移植

gedit ~/.bashrc
將 /opt/android-sdk-linux/tools 添加到 "PATH"環境變量中
將 /opt/android-ndk-r8b 添加到 "PATH"環境變量中

將x264源碼包last_x264.tar.bz2下載到~/x264-android目錄下，並解壓到目錄~/x264-android/x264-snapshot-20130808-2245/下

cd ~/x264-android/x264-snapshot-20130808-2245

執行以下配置腳本：

./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__"

然後：make

最後：在當前目錄下生成libx264.a的靜態庫

注：最好用android-ndk-r8b之前的ndk版本（包括android-ndk-r8b）編譯，android-ndk-r8b之後的版本編譯x264，最後會報"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、創建工程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的庫和頭文件到jni目錄

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、創建x264encoder類封裝x264的調用接口

以下是x264encoder.h(放在jni目錄下)

#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目錄下)

#include <stdlib.h>
#include <string.h>
#include "x264encoder.h"

// new version for x264 encoder
X264Encoder::X264Encoder()
{
this->bitratelevel = STANDARD_LEVEL;
qp_max = 30;
qp_min = 0;
i_fps = 20;
i_keyint_max = 300;
width = 352;
height = 288;

frameNo = 0;
isForceIDRFrameEnabled = false;

pParameter = NULL;
x264EncoderHandle = NULL;
// pPicture = NULL;
pOutput = NULL;
}

X264Encoder::~X264Encoder()
{
this->closeX264Encoder();
}

void X264Encoder::setSourceFormat(unsigned int sourcformat)
{
this->sourceFormat = sourcformat;
}

void X264Encoder::setResolution(unsigned int w, unsigned int h)
{
width = w;
height = h;
}

void X264Encoder::setBitrate(unsigned int i_bitrate)
{
if (i_bitrate > 0 && i_bitrate <= 64) {
this->bitratelevel = LOW_LEVEL;
}else if(i_bitrate > 64 && i_bitrate <= 128){
this->bitratelevel = MEDIUM_LEVEL;
}else if (i_bitrate > 128 && i_bitrate <= 256) {
this->bitratelevel = STANDARD_LEVEL;
}else if (i_bitrate > 256 && i_bitrate <= 384) {
this->bitratelevel = HIGH_LEVEL;
}else if (i_bitrate > 384 && i_bitrate <= 512) {
this->bitratelevel = HIGH_LEVEL;
}else {
this->bitratelevel = STANDARD_LEVEL;
}
}

void X264Encoder::setFps(unsigned int fps)
{
i_fps = fps;
}

void X264Encoder::setI_KeyInt_Max(unsigned int i_frame_max)
{
i_keyint_max = i_frame_max;
}

void X264Encoder::setQp_Max(unsigned int qp_max)
{
this->qp_max = qp_max;
}

void X264Encoder::setQp_Min(unsigned int qp_min)
{
this->qp_min = qp_min;
}

bool X264Encoder::openX264Encoder()
{
// return false;

this->closeX264Encoder();

if(!pParameter)
{
pParameter = (x264_param_t *)malloc(sizeof(x264_param_t));

if (!pParameter) {
this->closeX264Encoder();

return false;
}

memset(pParameter, 0, sizeof(x264_param_t));
}

int ret = x264_param_default_preset(pParameter, "ultrafast", "zerolatency");
if (ret != 0) {

this->closeX264Encoder();

return false;
}

pParameter->i_level_idc = 30;

pParameter->i_width = width;
pParameter->i_height = height;

pParameter->b_deterministic = 1;
// pParameter->b_sliced_threads = 1;
pParameter->i_threads = 1;

pParameter->i_csp = X264_CSP_I420;//X264_CSP_NV12;//X264_CSP_I420;

pParameter->i_fps_num = i_fps;
pParameter->i_fps_den = 1;
pParameter->i_bframe = 0;
pParameter->i_keyint_max = i_keyint_max;

// pParameter->b_open_gop = 1;

// pParameter->rc.i_bitrate = i_bitrate;

pParameter->rc.i_rc_method = X264_RC_CRF;//X264_RC_CQP;

if (this->bitratelevel == LOW_LEVEL) {
pParameter->rc.f_rf_constant = 32;
}else if(this->bitratelevel == MEDIUM_LEVEL){
pParameter->rc.f_rf_constant = 29;
}else if (this->bitratelevel == STANDARD_LEVEL) {
pParameter->rc.f_rf_constant = 26;
}else if (this->bitratelevel == HIGH_LEVEL) {
pParameter->rc.f_rf_constant = 24;
}else {
pParameter->rc.f_rf_constant = 24;
}

current_f_rf_constant = pParameter->rc.f_rf_constant;
userSetting_f_rf_constant = pParameter->rc.f_rf_constant;

// from huxiaopeng
pParameter->analyse.b_transform_8x8 = 1;
pParameter->rc.f_aq_strength = 1.5;

pParameter->rc.i_aq_mode = 0;
pParameter->rc.f_qcompress = 0.0;
pParameter->rc.f_ip_factor = 0.5;
pParameter->rc.f_rate_tolerance = 0.1;

pParameter->analyse.i_direct_mv_pred = X264_DIRECT_PRED_AUTO;
pParameter->analyse.i_me_method = X264_ME_DIA;
pParameter->analyse.i_me_range = 16;
pParameter->analyse.i_subpel_refine = 2;
// pParameter->analyse.i_noise_reduction = 1;

pParameter->i_slice_max_size = 1200;

// pParameter->i_nal_hrd = X264_NAL_HRD_NONE;

pParameter->b_deblocking_filter = 1;
pParameter->i_deblocking_filter_alphac0 = 4;
pParameter->i_deblocking_filter_beta = 4;

pParameter->rc.b_mb_tree = 0;

pParameter->i_log_level = X264_LOG_NONE;

if(x264_param_apply_profile(pParameter, "baseline"))
{
this->closeX264Encoder();

return false;
}

if (!x264EncoderHandle) {
x264EncoderHandle = x264_encoder_open(pParameter);

if (!x264EncoderHandle) {
this->closeX264Encoder();

return false;
}
}
/*
if (!pPicture) {
pPicture = (x264_picture_t *)malloc(sizeof(x264_picture_t));

if (!pPicture) {

this->closeX264Encoder();

return false;
}

memset(pPicture, 0, sizeof(x264_picture_t));
}

if (x264_picture_alloc(pPicture, X264_CSP_I420, width, height)) {

this->closeX264Encoder();

return false;
}
*/
if (!pOutput) {
pOutput = (x264_picture_t *)malloc(sizeof(x264_picture_t));

if (!pOutput) {
this->closeX264Encoder();
return false;
}

memset(pOutput, 0, sizeof(x264_picture_t));
}

return true;
}

void X264Encoder::forceIDRFrame()
{
isForceIDRFrameEnabled = true;
}

void X264Encoder::upgradeBitrateLevel()
{
/*
if (this->bitratelevel == HIGH_LEVEL) {
return;
}

this->bitratelevel++;

if (this->bitratelevel == LOW_LEVEL) {
pParameter->rc.f_rf_constant = 30;
}else if(this->bitratelevel == MEDIUM_LEVEL){
pParameter->rc.f_rf_constant = 27;
}else if (this->bitratelevel == STANDARD_LEVEL) {
pParameter->rc.f_rf_constant = 24;
}else if (this->bitratelevel == HIGH_LEVEL) {
pParameter->rc.f_rf_constant = 22;
}else {
pParameter->rc.f_rf_constant = 23;
}
*/

if (userSetting_f_rf_constant >= current_f_rf_constant) {
return;
}

pParameter->rc.f_rf_constant--;
current_f_rf_constant = pParameter->rc.f_rf_constant;

x264_encoder_reconfig(x264EncoderHandle, pParameter);
}

void X264Encoder::setLeastBitrateLevel()
{
pParameter->rc.f_rf_constant = 32;
current_f_rf_constant = pParameter->rc.f_rf_constant;

x264_encoder_reconfig(x264EncoderHandle, pParameter);
}

void X264Encoder::declineBitrateLevel()
{
/*
if (this->bitratelevel == LOW_LEVEL) {
return;
}

this->bitratelevel--;

if (this->bitratelevel == LOW_LEVEL) {
pParameter->rc.f_rf_constant = 30;
}else if(this->bitratelevel == MEDIUM_LEVEL){
pParameter->rc.f_rf_constant = 27;
}else if (this->bitratelevel == STANDARD_LEVEL) {
pParameter->rc.f_rf_constant = 24;
}else if (this->bitratelevel == HIGH_LEVEL) {
pParameter->rc.f_rf_constant = 22;
}else {
pParameter->rc.f_rf_constant = 23;
}
*/

if (32 <= current_f_rf_constant) {
return;
}

pParameter->rc.f_rf_constant++;
current_f_rf_constant = pParameter->rc.f_rf_constant;

x264_encoder_reconfig(x264EncoderHandle, pParameter);
}

long X264Encoder::x264EncoderProcess(x264_picture_t *pPicture, x264_nal_t **nals, int& nalsCount)
{
pPicture->i_pts = (int64_t)(frameNo * pParameter->i_fps_den);
pPicture->i_type = X264_TYPE_AUTO;
pPicture->i_qpplus1 = 0;//X264_QP_AUTO;

if (isForceIDRFrameEnabled) {
pPicture->i_type = X264_TYPE_IDR;
isForceIDRFrameEnabled = false;
}

int32_t framesize = -1;


framesize = x264_encoder_encode(x264EncoderHandle, nals, &nalsCount, pPicture, pOutput);

if (framesize>0) {
frameNo++;
}

return framesize;
}

/*
long X264Encoder::x264EncoderProcess(uint8_t *pSrcData, int srcDataSize, x264_nal_t **nals, int& nalsCount)
{

pPicture->img.plane[0] = pSrcData;
pPicture->img.plane[1] = pSrcData + srcDataSize*2/3;
pPicture->img.plane[2] = pSrcData + srcDataSize*2/3 + srcDataSize/6;
pPicture->i_pts = (int64_t)(frameNo * pParameter->i_fps_den);
pPicture->i_type = X264_TYPE_AUTO;
pPicture->i_qpplus1 = X264_QP_AUTO;

if (isForceIDRFrameEnabled) {
pPicture->i_type = X264_TYPE_IDR;
isForceIDRFrameEnabled = false;
}

int32_t framesize = -1;


framesize = x264_encoder_encode(x264EncoderHandle, nals, &nalsCount, pPicture, pOutput);

if (framesize>0) {
frameNo++;
}

return framesize;
}
*/
bool X264Encoder::closeX264Encoder()
{
if (pOutput) {
free(pOutput);
pOutput = NULL;
}
/*
if (pPicture) {
free(pPicture);
pPicture = NULL;
}
*/
if (pParameter) {
free(pParameter);
pParameter = NULL;
}

if (x264EncoderHandle) {
x264_encoder_close(x264EncoderHandle);
x264EncoderHandle = NULL;
}

return true;
}

4、在jni目錄下創建測試編碼的源文件x264_main.cpp

#include <stdio.h>
#include "x264encoder.h"

int main( int argc, char **argv )
{
X264Encoder x264Encoder;

x264Encoder.setBitrate(512);
x264Encoder.setResolution(640,480);
x264Encoder.setFps(20);

FILE *inputFile = NULL;
FILE *outputFile = NULL;
inputFile = fopen("yuv_640x480.yuv","rb");
outputFile = fopen("h264_640x480.h264","wb");

x264_picture_t inputPicture;
x264_picture_alloc(&inputPicture, X264_CSP_I420, 640, 480);

x264_nal_t *p_nals = NULL;
int nalsCount = 0;

if(x264Encoder.openX264Encoder())
{
for(int j=0; j<20; j++)
{
fread(inputPicture.img.plane[0],1,640*480, inputFile);
fread(inputPicture.img.plane[1],1,640*480/4, inputFile);
fread(inputPicture.img.plane[2],1,640*480/4, inputFile);

x264Encoder.x264EncoderProcess(&inputPicture,&p_nals,nalsCount);

if(p_nals)
{
for(int i=0; i<nalsCount; i++)
{
fwrite(p_nals[i].p_payload, p_nals[i].i_payload, 1, outputFile);
}
}
}

}

fclose(inputFile);
fclose(outputFile);

x264_picture_clean(&inputPicture);

x264Encoder.closeX264Encoder();

return 0;
}

接下來請看第2頁精彩內容：http://www.linuxidc.com/Linux/2013-08/88540p2.htm