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。

 

Android程序Java端代码位于src\com\leixiaohua1020\sffmpegandroidstreamer\MainActivity.java，如下所示。

/**
 * 最简单的基于FFmpeg的推流器(RTMP)-安卓
 * Simplest FFmpeg Android Streamer (RTMP)
 * 
 * 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
 * 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
# leixiaohua1020@126.com
# http://blog.csdn.net/leixiaohua1020
# 

LOCAL_PATH := $(call my-dir)

# FFmpeg library
include $(CLEAR_VARS)
LOCAL_MODULE := avcodec
LOCAL_SRC_FILES := libavcodec-56.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := avdevice
LOCAL_SRC_FILES := libavdevice-56.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := avfilter
LOCAL_SRC_FILES := libavfilter-5.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := avformat
LOCAL_SRC_FILES := libavformat-56.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := avutil
LOCAL_SRC_FILES := libavutil-54.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := postproc
LOCAL_SRC_FILES := libpostproc-53.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := swresample
LOCAL_SRC_FILES := libswresample-1.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := swscale
LOCAL_SRC_FILES := libswscale-3.so
include $(PREBUILT_SHARED_LIBRARY)

# Program
include $(CLEAR_VARS)
LOCAL_MODULE := sffstreamer
LOCAL_SRC_FILES :=simplest_ffmpeg_streamer.c
LOCAL_C_INCLUDES += $(LOCAL_PATH)/include
LOCAL_LDLIBS := -llog -lz
LOCAL_SHARED_LIBRARIES := avcodec avdevice avfilter avformat avutil postproc swresample swscale
include $(BUILD_SHARED_LIBRARY)

运行结果

App在手机上运行后的结果如下图所示。

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