最简单的基于FFmpeg的移动端例子：Android 视频解码器-单个库版

标签：ffmpeg   android   视频解码   yuv   jni   

FFmpeg类库的打包

libavformat-56.so
libavcodec-56.so
libavfilter-5.so
libavdevice-56.so
libavutil-54.so
libpostproc-53.so
libswresample-1.so
libswscale-3.so

cd ffmpeg

make clean

export NDK=/home/leixiaohua1020/cdtworkspace/android-ndk-r9d
export PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt
export PLATFORM=$NDK/platforms/android-8/arch-arm
export PREFIX=../ff-pure-onelib
build_one(){
  ./configure --target-os=linux --prefix=$PREFIX --enable-cross-compile --enable-runtime-cpudetect --disable-asm --arch=arm --cc=$PREBUILT/linux-x86_64/bin/arm-linux-androideabi-gcc --cross-prefix=$PREBUILT/linux-x86_64/bin/arm-linux-androideabi- --disable-stripping --nm=$PREBUILT/linux-x86_64/bin/arm-linux-androideabi-nm --sysroot=$PLATFORM --enable-gpl --enable-static --disable-shared --enable-nonfree --enable-version3 --enable-small --enable-zlib --disable-ffprobe --disable-ffplay --disable-ffmpeg --disable-ffserver --disable-debug --extra-cflags="-fPIC -DANDROID -D__thumb__ -mthumb -Wfatal-errors -Wno-deprecated -mfloat-abi=softfp -marm -march=armv7-a" 
}

build_one

make
make install

$PREBUILT/linux-x86_64/bin/arm-linux-androideabi-ld -rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -L$PREFIX/lib -soname libffmpeg.so -shared -nostdlib -Bsymbolic --whole-archive --no-undefined -o $PREFIX/libffmpeg.so libavcodec/libavcodec.a libavfilter/libavfilter.a libswresample/libswresample.a libavformat/libavformat.a libavutil/libavutil.a libswscale/libswscale.a libpostproc/libpostproc.a libavdevice/libavdevice.a -lc -lm -lz -ldl -llog --dynamic-linker=/system/bin/linker $PREBUILT/linux-x86_64/lib/gcc/arm-linux-androideabi/4.8/libgcc.a

cd ..

需要注意：

（1）与前面记录的脚本不同，这个脚本不再需要修改Configure的内容（生成的是*.a而不是*.so，并没有涉及到版本号问题）。

（2）前文记录的脚本里面Configure的时候是“--enable-shared --disable-static”，这个脚本里面Configure的时候设置的是“--enable-static --disable-shared”。编译完成后生成的是：

libavcodec.a

libavfilter.a

libswresample.a

libavformat.a

libavutil.a

libswscale.a

libpostproc.a

libavdevice.a

该脚本运行完后，会把上述的*.a文件打包为1个*.so文件：

libffmpeg.so

合并后的类库使用起来和合并前的类库使用方法没有区别。

源代码

 

/**
 * 最简单的基于FFmpeg的视频解码器-安卓 - 单库版
 * Simplest FFmpeg Android Decoder - One Library
 * 
 * 雷霄骅 Lei Xiaohua
 * leixiaohua1020@126.com
 * 中国传媒大学/数字电视技术
 * Communication University of China / Digital TV Technology
 * http://blog.csdn.net/leixiaohua1020
 * 
 * 本程序是安卓平台下最简单的基于FFmpeg的视频解码器。
 * 它可以将输入的视频数据解码成YUV像素数据。
 * 
 * This software is the simplest decoder based on FFmpeg in Android. 
 * It can decode video stream to raw YUV data.
 * 
 */
package com.leixiaohua1020.sffmpegandroiddecoder;


import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.text.Editable;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends Activity {

	
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
		Button startButton = (Button) this.findViewById(R.id.button_start);
		final EditText urlEdittext_input= (EditText) this.findViewById(R.id.input_url);
		final EditText urlEdittext_output= (EditText) this.findViewById(R.id.output_url);
		
		startButton.setOnClickListener(new OnClickListener() {
			public void onClick(View arg0){

				String folderurl=Environment.getExternalStorageDirectory().getPath();
				
				String urltext_input=urlEdittext_input.getText().toString();
		        String inputurl=folderurl+"/"+urltext_input;
		        
		        String urltext_output=urlEdittext_output.getText().toString();
		        String outputurl=folderurl+"/"+urltext_output;
		        
		        Log.i("inputurl",inputurl);
		        Log.i("outputurl",outputurl);
		    
		        decode(inputurl,outputurl);
		        
			}
		});
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    
    //JNI
    public native int decode(String inputurl, String outputurl);
    
    static{
    	System.loadLibrary("ffmpeg");
    	System.loadLibrary("sffdecoder");
    }
}

/**
 * 最简单的基于FFmpeg的视频解码器-安卓 - 单库版
 * Simplest FFmpeg Android Decoder - One Library
 *
 * 雷霄骅 Lei Xiaohua
 * leixiaohua1020@126.com
 * 中国传媒大学/数字电视技术
 * Communication University of China / Digital TV Technology
 * http://blog.csdn.net/leixiaohua1020
 *
 * 本程序是安卓平台下最简单的基于FFmpeg的视频解码器。
 * 它可以将输入的视频数据解码成YUV像素数据。
 *
 * This software is the simplest decoder based on FFmpeg in Android.
 * It can decode video stream to raw YUV data.
 *
 */


#include <stdio.h>
#include <time.h> 

#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libswscale/swscale.h"
#include "libavutil/log.h"

#ifdef ANDROID
#include <jni.h>
#include <android/log.h>
#define LOGE(format, ...)  __android_log_print(ANDROID_LOG_ERROR, "(>_<)", format, ##__VA_ARGS__)
#define LOGI(format, ...)  __android_log_print(ANDROID_LOG_INFO,  "(=_=)", format, ##__VA_ARGS__)
#else
#define LOGE(format, ...)  printf("(>_<) " format "\n", ##__VA_ARGS__)
#define LOGI(format, ...)  printf("(^_^) " format "\n", ##__VA_ARGS__)
#endif


//Output FFmpeg‘s av_log()
void custom_log(void *ptr, int level, const char* fmt, va_list vl){
	FILE *fp=fopen("/storage/emulated/0/av_log.txt","a+");
	if(fp){
		vfprintf(fp,fmt,vl);
		fflush(fp);
		fclose(fp);
	}
}

JNIEXPORT jint JNICALL Java_com_leixiaohua1020_sffmpegandroiddecoder_MainActivity_decode
  (JNIEnv *env, jobject obj, jstring input_jstr, jstring output_jstr)
{
	AVFormatContext	*pFormatCtx;
	int				i, videoindex;
	AVCodecContext	*pCodecCtx;
	AVCodec			*pCodec;
	AVFrame	*pFrame,*pFrameYUV;
	uint8_t *out_buffer;
	AVPacket *packet;
	int y_size;
	int ret, got_picture;
	struct SwsContext *img_convert_ctx;
	FILE *fp_yuv;
	int frame_cnt;
	clock_t time_start, time_finish;
	double  time_duration = 0.0;

	char input_str[500]={0};
	char output_str[500]={0};
	char info[1000]={0};
	sprintf(input_str,"%s",(*env)->GetStringUTFChars(env,input_jstr, NULL));
	sprintf(output_str,"%s",(*env)->GetStringUTFChars(env,output_jstr, NULL));

	//FFmpeg av_log() callback
  av_log_set_callback(custom_log);
	
	av_register_all();
	avformat_network_init();
	pFormatCtx = avformat_alloc_context();

	if(avformat_open_input(&pFormatCtx,input_str,NULL,NULL)!=0){
		LOGE("Couldn‘t open input stream.\n");
		return -1;
	}
	if(avformat_find_stream_info(pFormatCtx,NULL)<0){
		LOGE("Couldn‘t find stream information.\n");
		return -1;
	}
	videoindex=-1;
	for(i=0; i<pFormatCtx->nb_streams; i++) 
		if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO){
			videoindex=i;
			break;
		}
	if(videoindex==-1){
		LOGE("Couldn‘t find a video stream.\n");
		return -1;
	}
	pCodecCtx=pFormatCtx->streams[videoindex]->codec;
	pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
	if(pCodec==NULL){
		LOGE("Couldn‘t find Codec.\n");
		return -1;
	}
	if(avcodec_open2(pCodecCtx, pCodec,NULL)<0){
		LOGE("Couldn‘t open codec.\n");
		return -1;
	}
	
	pFrame=av_frame_alloc();
	pFrameYUV=av_frame_alloc();
	out_buffer=(uint8_t *)av_malloc(avpicture_get_size(PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height));
	avpicture_fill((AVPicture *)pFrameYUV, out_buffer, PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height);
	packet=(AVPacket *)av_malloc(sizeof(AVPacket));

	img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, 
	pCodecCtx->width, pCodecCtx->height, PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL); 

  
  sprintf(info,   "[Input     ]%s\n", input_str);
  sprintf(info, "%s[Output    ]%s\n",info,output_str);
  sprintf(info, "%s[Format    ]%s\n",info, pFormatCtx->iformat->name);
  sprintf(info, "%s[Codec     ]%s\n",info, pCodecCtx->codec->name);
  sprintf(info, "%s[Resolution]%dx%d\n",info, pCodecCtx->width,pCodecCtx->height);


  fp_yuv=fopen(output_str,"wb+");
  if(fp_yuv==NULL){
		printf("Cannot open output file.\n");
		return -1;
	}
	
	frame_cnt=0;
	time_start = clock();
	
	while(av_read_frame(pFormatCtx, packet)>=0){
		if(packet->stream_index==videoindex){
			ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, packet);
			if(ret < 0){
				LOGE("Decode Error.\n");
				return -1;
			}
			if(got_picture){
				sws_scale(img_convert_ctx, (const uint8_t* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height, 
					pFrameYUV->data, pFrameYUV->linesize);
				
				y_size=pCodecCtx->width*pCodecCtx->height;  
				fwrite(pFrameYUV->data[0],1,y_size,fp_yuv);    //Y 
				fwrite(pFrameYUV->data[1],1,y_size/4,fp_yuv);  //U
				fwrite(pFrameYUV->data[2],1,y_size/4,fp_yuv);  //V
				//Output info
				char pictype_str[10]={0};
				switch(pFrame->pict_type){
					case AV_PICTURE_TYPE_I:sprintf(pictype_str,"I");break;
				  case AV_PICTURE_TYPE_P:sprintf(pictype_str,"P");break;
					case AV_PICTURE_TYPE_B:sprintf(pictype_str,"B");break;
					default:sprintf(pictype_str,"Other");break;
				}
				LOGI("Frame Index: %5d. Type:%s",frame_cnt,pictype_str);
				frame_cnt++;
			}
		}
		av_free_packet(packet);
	}
	//flush decoder
	//FIX: Flush Frames remained in Codec
	while (1) {
		ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, packet);
		if (ret < 0)
			break;
		if (!got_picture)
			break;
		sws_scale(img_convert_ctx, (const uint8_t* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height, 
			pFrameYUV->data, pFrameYUV->linesize);
		int y_size=pCodecCtx->width*pCodecCtx->height;  
		fwrite(pFrameYUV->data[0],1,y_size,fp_yuv);    //Y 
		fwrite(pFrameYUV->data[1],1,y_size/4,fp_yuv);  //U
		fwrite(pFrameYUV->data[2],1,y_size/4,fp_yuv);  //V
		//Output info
		char pictype_str[10]={0};
		switch(pFrame->pict_type){
			case AV_PICTURE_TYPE_I:sprintf(pictype_str,"I");break;
		  case AV_PICTURE_TYPE_P:sprintf(pictype_str,"P");break;
			case AV_PICTURE_TYPE_B:sprintf(pictype_str,"B");break;
			default:sprintf(pictype_str,"Other");break;
		}
		LOGI("Frame Index: %5d. Type:%s",frame_cnt,pictype_str);
		frame_cnt++;
	}
	time_finish = clock(); 
	time_duration=(double)(time_finish - time_start);
	
	sprintf(info, "%s[Time      ]%fms\n",info,time_duration);
	sprintf(info, "%s[Count     ]%d\n",info,frame_cnt);

	sws_freeContext(img_convert_ctx);

  fclose(fp_yuv);

	av_frame_free(&pFrameYUV);
	av_frame_free(&pFrame);
	avcodec_close(pCodecCtx);
	avformat_close_input(&pFormatCtx);

	return 0;
}

# Android.mk for FFmpeg
#
# Lei Xiaohua 雷霄骅
# leixiaohua1020@126.com
# http://blog.csdn.net/leixiaohua1020
# 

LOCAL_PATH := $(call my-dir)

# FFmpeg library
include $(CLEAR_VARS)
LOCAL_MODULE := ffmpeg
LOCAL_SRC_FILES := libffmpeg.so
include $(PREBUILT_SHARED_LIBRARY)


# Program
include $(CLEAR_VARS)
LOCAL_MODULE := sffdecoder
LOCAL_SRC_FILES :=simplest_ffmpeg_decoder.c
LOCAL_C_INCLUDES += $(LOCAL_PATH)/include
LOCAL_LDLIBS := -llog -lz
LOCAL_SHARED_LIBRARIES := ffmpeg
include $(BUILD_SHARED_LIBRARY)

运行结果

 

 

下载

simplest ffmpeg mobile

项目主页

Github：https://github.com/leixiaohua1020/simplest_ffmpeg_mobile

开源中国：https://git.oschina.net/leixiaohua1020/simplest_ffmpeg_mobile

CSDN工程下载地址：http://download.csdn.net/detail/leixiaohua1020/8924391

[Android]
simplest_android_player: 基于安卓接口的视频播放器
simplest_ffmpeg_android_helloworld: 安卓平台下基于FFmpeg的HelloWorld程序
simplest_ffmpeg_android_decoder: 安卓平台下最简单的基于FFmpeg的视频解码器
simplest_ffmpeg_android_decoder_onelib: 安卓平台下最简单的基于FFmpeg的视频解码器-单库版
simplest_ffmpeg_android_streamer: 安卓平台下最简单的基于FFmpeg的推流器
simplest_ffmpeg_android_transcoder: 安卓平台下移植的FFmpeg命令行工具
simplest_sdl_android_helloworld: 移植SDL到安卓平台的最简单程序
[IOS]
simplest_ios_player: 基于IOS接口的视频播放器
simplest_ffmpeg_ios_helloworld: IOS平台下基于FFmpeg的HelloWorld程序
simplest_ffmpeg_ios_decoder: IOS平台下最简单的基于FFmpeg的视频解码器
simplest_ffmpeg_ios_streamer: IOS平台下最简单的基于FFmpeg的推流器
simplest_ffmpeg_ios_transcoder: IOS平台下移植的ffmpeg.c命令行工具
simplest_sdl_ios_helloworld: 移植SDL到IOS平台的最简单程序

最简单的基于FFmpeg的移动端例子：Android 视频解码器-单个库版

标签：ffmpeg   android   视频解码   yuv   jni   

原文地址：http://blog.csdn.net/leixiaohua1020/article/details/47011021