最简单的基于FFmpeg的移动端例子:Android(安卓)视频解码器
=====================================================
最简单的基于FFmpeg的移动端例子系列文章列表:
最简单的基于FFmpeg的移动端例子:Android HelloWorld
最简单的基于FFmpeg的移动端例子:Android 视频解码器
最简单的基于FFmpeg的移动端例子:Android 视频解码器-单个库版
最简单的基于FFmpeg的移动端例子:Android 推流器
最简单的基于FFmpeg的移动端例子:Android 视频转码器
最简单的基于FFmpeg的移动端例子附件:Android 自带播放器
最简单的基于FFmpeg的移动端例子附件:SDL Android HelloWorld
最简单的基于FFmpeg的移动端例子:IOS HelloWorld
最简单的基于FFmpeg的移动端例子:IOS 视频解码器
最简单的基于FFmpeg的移动端例子:IOS 推流器
最简单的基于FFmpeg的移动端例子:IOS 视频转码器
最简单的基于FFmpeg的移动端例子附件:IOS自带播放器
最简单的基于FFmpeg的移动端例子:Windows Phone HelloWorld
=====================================================
本文记录一个安卓平台下基于FFmpeg的视频解码器。该视频解码器C语言的源代码来自于《最简单的基于FFMPEG+SDL的视频播放器》。相关的概念就不再重复记录了。
源代码
项目的目录结构如图所示。Java源代码位于src目录,而C代码位于jni目录。Android程序Java端代码位于src\com\leixiaohua1020\sffmpegandroiddecoder\MainActivity.java,如下所示。
/** * 最简单的基于FFmpeg的视频解码器-安卓 * Simplest FFmpeg Android Decoder * * 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("avutil-54"); System.loadLibrary("swresample-1"); System.loadLibrary("avcodec-56"); System.loadLibrary("avformat-56"); System.loadLibrary("swscale-3"); System.loadLibrary("postproc-53"); System.loadLibrary("avfilter-5"); System.loadLibrary("avdevice-56"); System.loadLibrary("sffdecoder"); }}
C语言端源代码位于jni/simplest_ffmpeg_decoder.c,如下所示。
/** * 最简单的基于FFmpeg的视频解码器-安卓 * Simplest FFmpeg Android Decoder * * 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;inti, 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); //Ufwrite(pFrameYUV->data[2],1,y_size/4,fp_yuv); //V//Output infochar 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 Codecwhile (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); //Ufwrite(pFrameYUV->data[2],1,y_size/4,fp_yuv); //V//Output infochar 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文件位于jni/Android.mk,如下所示。
# Android.mk for FFmpeg## Lei Xiaohua 雷霄骅# leixiaohua1020@126.com# http://blog.csdn.net/leixiaohua1020# LOCAL_PATH := $(call my-dir)# FFmpeg libraryinclude $(CLEAR_VARS)LOCAL_MODULE := avcodecLOCAL_SRC_FILES := libavcodec-56.soinclude $(PREBUILT_SHARED_LIBRARY)include $(CLEAR_VARS)LOCAL_MODULE := avdeviceLOCAL_SRC_FILES := libavdevice-56.soinclude $(PREBUILT_SHARED_LIBRARY)include $(CLEAR_VARS)LOCAL_MODULE := avfilterLOCAL_SRC_FILES := libavfilter-5.soinclude $(PREBUILT_SHARED_LIBRARY)include $(CLEAR_VARS)LOCAL_MODULE := avformatLOCAL_SRC_FILES := libavformat-56.soinclude $(PREBUILT_SHARED_LIBRARY)include $(CLEAR_VARS)LOCAL_MODULE := avutilLOCAL_SRC_FILES := libavutil-54.soinclude $(PREBUILT_SHARED_LIBRARY)include $(CLEAR_VARS)LOCAL_MODULE := postprocLOCAL_SRC_FILES := libpostproc-53.soinclude $(PREBUILT_SHARED_LIBRARY)include $(CLEAR_VARS)LOCAL_MODULE := swresampleLOCAL_SRC_FILES := libswresample-1.soinclude $(PREBUILT_SHARED_LIBRARY)include $(CLEAR_VARS)LOCAL_MODULE := swscaleLOCAL_SRC_FILES := libswscale-3.soinclude $(PREBUILT_SHARED_LIBRARY)# Programinclude $(CLEAR_VARS)LOCAL_MODULE := sffdecoderLOCAL_SRC_FILES :=simplest_ffmpeg_decoder.cLOCAL_C_INCLUDES += $(LOCAL_PATH)/includeLOCAL_LDLIBS := -llog -lzLOCAL_SHARED_LIBRARIES := avcodec avdevice avfilter avformat avutil postproc swresample swscaleinclude $(BUILD_SHARED_LIBRARY)
运行结果
App在手机上运行后的结果如下图所示。注意需要把等待解码的视频文件拷贝至存储卡相应的目录中。例如对于上述截图的情况,需要将sintel.mp4拷贝至存储卡的根目录中。
单击“Start”按钮就可以将存储卡根目录中的视频文件解码为YUV文件(需要等待一段时间完成解码)。注意解码后的YUV文件体积巨大,可能会占用大量的存储卡空间。
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
SourceForge:https://sourceforge.net/projects/simplestffmpegmobile/
CSDN工程下载地址:http://download.csdn.net/detail/leixiaohua1020/8924391
本解决方案包含了使用FFmpeg在移动端处理多媒体的各种例子:
[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
更多相关文章
- 最简单的基于FFmpeg的移动端例子:Android(安卓)HelloWorld
- Android数据可视化
- html移动应用开发技术分享
- Android(安卓)http请求例子、Unicode转UTF-8 java代码收藏
- android:configChanges属性
- Android(安卓)开发学习 HelloAndroid例子
- Android(安卓)开发学习 HelloAndroid例子
- Android中检测手机制式和移动网络类型
- Android调用WebService之客户端实现(二)