本文记录一个安卓平台下基于FFmpeg的视频推流器。该推流器C语言的源代码来自于《最简单的基于FFMPEG的推流器》。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。 
/** * 最简单的基于FFmpeg的推流器(RTMP)-安卓 * Simplest FFmpeg Android Streamer (RTMP) * * 雷霄骅 Lei Xiaohua * [email protected] * 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的推流器。 * 它可以将视频文件以流媒体的形式推送到服务器。 * * This software is the simplest streamer based on FFmpeg in Android. * It can stream local media file to streaming media server (in RTMP). * */package com.leixiaohua1020.sffmpegandroidstreamer;import android.os.Bundle;import android.os.Environment;import android.app.Activity;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;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 outputurl=urlEdittext_output.getText().toString(); Log.e("inputurl",inputurl); Log.e("outputurl",outputurl); String info=""; stream(inputurl,outputurl); Log.e("Info",info); } }); } @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 stream(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("sffstreamer"); } }
C语言端源代码位于jni/simplest_ffmpeg_streamer.c，如下所示。
/** * 最简单的基于FFmpeg的推流器-安卓 * Simplest FFmpeg Android Streamer * * 雷霄骅 Lei Xiaohua * [email protected] * 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的流媒体推送器。 * 它可以将视频数据以流媒体的形式发送出去。 * * This software is the simplest streamer based on FFmpeg in Android. * It can stream local media file to streaming media server (in RTMP). */#include <stdio.h>#include <time.h> #include "libavcodec/avcodec.h"#include "libavformat/avformat.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){ //To TXT file FILE *fp=fopen("/storage/emulated/0/av_log.txt","a+"); if(fp){ vfprintf(fp,fmt,vl); fflush(fp); fclose(fp); } //To Logcat //LOGE(fmt, vl);}JNIEXPORT jint JNICALL Java_com_leixiaohua1020_sffmpegandroidstreamer_MainActivity_stream (JNIEnv *env, jobject obj, jstring input_jstr, jstring output_jstr){ AVOutputFormat *ofmt = NULL; AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL; AVPacket pkt; int ret, i; 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)); //input_str = "cuc_ieschool.flv"; //output_str = "rtmp://localhost/publishlive/livestream"; //output_str = "rtp://233.233.233.233:6666"; //FFmpeg av_log() callback av_log_set_callback(custom_log); av_register_all(); //Network avformat_network_init(); //Input if ((ret = avformat_open_input(&ifmt_ctx, input_str, 0, 0)) < 0) { LOGE( "Could not open input file."); goto end; } if ((ret = avformat_find_stream_info(ifmt_ctx, 0)) < 0) { LOGE( "Failed to retrieve input stream information"); goto end; } int videoindex=-1; for(i=0; i<ifmt_ctx->nb_streams; i++) if(ifmt_ctx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO){ videoindex=i; break; } //Output avformat_alloc_output_context2(&ofmt_ctx, NULL, "flv",output_str); //RTMP //avformat_alloc_output_context2(&ofmt_ctx, NULL, "mpegts", output_str);//UDP if (!ofmt_ctx) { LOGE( "Could not create output context\n"); ret = AVERROR_UNKNOWN; goto end; } ofmt = ofmt_ctx->oformat; for (i = 0; i < ifmt_ctx->nb_streams; i++) { //Create output AVStream according to input AVStream AVStream *in_stream = ifmt_ctx->streams[i]; AVStream *out_stream = avformat_new_stream(ofmt_ctx, in_stream->codec->codec); if (!out_stream) { LOGE( "Failed allocating output stream\n"); ret = AVERROR_UNKNOWN; goto end; } //Copy the settings of AVCodecContext ret = avcodec_copy_context(out_stream->codec, in_stream->codec); if (ret < 0) { LOGE( "Failed to copy context from input to output stream codec context\n"); goto end; } out_stream->codec->codec_tag = 0; if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER) out_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER; } //Open output URL if (!(ofmt->flags & AVFMT_NOFILE)) { ret = avio_open(&ofmt_ctx->pb, output_str, AVIO_FLAG_WRITE); if (ret < 0) { LOGE( "Could not open output URL '%s'", output_str); goto end; } } //Write file header ret = avformat_write_header(ofmt_ctx, NULL); if (ret < 0) { LOGE( "Error occurred when opening output URL\n"); goto end; } int frame_index=0; int64_t start_time=av_gettime(); while (1) { AVStream *in_stream, *out_stream; //Get an AVPacket ret = av_read_frame(ifmt_ctx, &pkt); if (ret < 0) break; //FIX：No PTS (Example: Raw H.264) //Simple Write PTS if(pkt.pts==AV_NOPTS_VALUE){ //Write PTS AVRational time_base1=ifmt_ctx->streams[videoindex]->time_base; //Duration between 2 frames (us) int64_t calc_duration=(double)AV_TIME_BASE/av_q2d(ifmt_ctx->streams[videoindex]->r_frame_rate); //Parameters pkt.pts=(double)(frame_index*calc_duration)/(double)(av_q2d(time_base1)*AV_TIME_BASE); pkt.dts=pkt.pts; pkt.duration=(double)calc_duration/(double)(av_q2d(time_base1)*AV_TIME_BASE); } //Important:Delay if(pkt.stream_index==videoindex){ AVRational time_base=ifmt_ctx->streams[videoindex]->time_base; AVRational time_base_q={1,AV_TIME_BASE}; int64_t pts_time = av_rescale_q(pkt.dts, time_base, time_base_q); int64_t now_time = av_gettime() - start_time; if (pts_time > now_time) av_usleep(pts_time - now_time); } in_stream = ifmt_ctx->streams[pkt.stream_index]; out_stream = ofmt_ctx->streams[pkt.stream_index]; /* copy packet */ //Convert PTS/DTS pkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base, out_stream->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX); pkt.dts = av_rescale_q_rnd(pkt.dts, in_stream->time_base, out_stream->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX); pkt.duration = av_rescale_q(pkt.duration, in_stream->time_base, out_stream->time_base); pkt.pos = -1; //Print to Screen if(pkt.stream_index==videoindex){ LOGE("Send %8d video frames to output URL\n",frame_index); frame_index++; } //ret = av_write_frame(ofmt_ctx, &pkt); ret = av_interleaved_write_frame(ofmt_ctx, &pkt); if (ret < 0) { LOGE( "Error muxing packet\n"); break; } av_free_packet(&pkt); } //Write file trailer av_write_trailer(ofmt_ctx);end: avformat_close_input(&ifmt_ctx); /* close output */ if (ofmt_ctx && !(ofmt->flags & AVFMT_NOFILE)) avio_close(ofmt_ctx->pb); avformat_free_context(ofmt_ctx); if (ret < 0 && ret != AVERROR_EOF) { LOGE( "Error occurred.\n"); return -1; } return 0;}
Android.mk文件位于jni/Android.mk，如下所示。
# Android.mk for FFmpeg## Lei Xiaohua 雷霄骅# [email protected]# 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 := sffstreamerLOCAL_SRC_FILES :=simplest_ffmpeg_streamer.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。
注意需要把等待推送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。
推流后的视频可以在电脑端使用ffplay接收，如下图所示。
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
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
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