Android平臺下RTMPDump的使用

簡介

RTMPDump是一個用來處理RTMP流媒體的工具包，是一個C++的開源工程。而我們需要將Android平臺下直接使用RTMPDump來進行RTMP推流，這里就涉及兩個方便內容：第一，需要使用NDK對RTMPDump進行交叉編譯。第二，如何在Android平臺下使用RTMPDump。今天這篇文章主要是教會大家如何將RTMPDump移植到Android平臺，讓大家可以把代碼跑起來看到直觀的效果，至于具體RTMPDump的使用后面再詳細介紹，當然網上也有很多教程，但第一步一般最容易把大家卡住，我就先和大家把第一步走好。

Linux使用ndk編譯RTMPDump

網上對這一步有很多介紹，但我都沒編出來，折磨了好久。但只要花時間，還是可以搞出來的，這里我詳細介紹下，當然最后也會提供完成可用的源碼。

編譯環境

  • CentOS Linux release 7.4.1708 (Core)
  • 下載配置android sdk manager，下載ndk配置環境變量，參考Linux下Android構建環境
  • gcc 、openssh等如果發現缺少依賴軟件，直接用yum安裝即可。

下載配置RTMPDump

RTMPDump直接到官網下載

1.png

我們直接下載最新的版本2.3

2.png

源碼在librtmp文件夾下。然后我們新建一個文件夾rtmp后面用來進行編譯：
3.png

新建一個jni目錄，目錄結構如上。然后將下載RTMPDump的頭文件（.h）拷貝到include中，將.c文件拷貝到src中。如下圖：
4.png

然后需要在jni目錄下新建Android.mk和Application.mk文件
Android.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
LOCAL_MODULE := librtmp
LOCAL_SRC_FILES := \
    src/amf.c \
    src/hashswf.c \
    src/log.c \
    src/parseurl.c \
    src/rtmp.c \

LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
LOCAL_LDLIBS := -L$(SYSROOT)/usr/lib -llog
LOCAL_CFLAGS := -Wall -O2 -DSYS=posix -DNO_CRYPTO
TARGET_PLATFORM := android-23

### librtmp library ###
### shared library use the first line
### static library use the second line
### !!! only one line can be used !!! ###

include $(BUILD_SHARED_LIBRARY)
#include $(BUILD_STATIC_LIBRARY)

Application.mk

APP_ABI := all

到此就配置完成了在rtmp的根目錄下執行

[root@MiWiFi-R2D-srv home]# ndk-build

當然你得把ndk配置到環境變量中
最后生成libs目錄，這樣so包就OK了，基本所有平臺都支持

5.png

這里我給出編譯項目地址 RtmpDump-Android，大家可以直接clone使用。當然已經編譯好的動態庫在libs下，大家可以直接使用。

Android平臺下使用RTMPDump

前面我們已經把要使用的so編譯出來了。接下來就是如何在Android平臺下使用，這里還是在這個專題的同步項目中寫代碼FFmpegSample。本篇文章對應的代碼是v1.4，大家一定注意版本。

7.png

設計RTMPDump的代碼并不多。我把新增的文件標記出來：
8.png

  • cpp/include下的librtmp就是我們在編譯RTMPDump時候用到的頭文件，這里直接copy過來即可。
  • rtmp_handle.cpp 是真正業務實現的地方
  • RtmpHandle.java 是提供native的調用入口

接下來講具體集成流程：

第一步

將RTMPDump頭文件copy到cpp/include下，在用動態庫的時候頭文件當然是必須的

第二步

將前面編譯得到的librtmp.so復制到項目的jniLibs/armeabi目錄下。注意：這里我測試使用的是arm機器，所以就直接使用armeabi下的so

第三步

修改CmakeList.txt
新增

add_library(rtmp SHARED IMPORTED)
set_target_properties(rtmp
  PROPERTIES IMPORTED_LOCATION
  ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/librtmp.so)

修改鏈接庫，添加rtmp

target_link_libraries( # Specifies the target library.
                       ffmpeg-handle

                       avcodec
                       avdevice
                       avfilter
                       avformat
                       avutil
                       swresample
                       swscale
                       rtmp
                       # Links the target library to the log library
                       # included in the NDK.
                       ${log-lib} )

第四步

新建RtmpHandle.java

public class RtmpHandle {
    public static RtmpHandle mInstance;

    private RtmpHandle() {
    }

    public synchronized static RtmpHandle getInstance() {
        if (mInstance == null) {
            mInstance = new RtmpHandle();
        }
        return mInstance;
    }

    static {
        System.loadLibrary("rtmp");
    }

    public native void pushFile(String path);
}

加載rtmp的庫，提供native調用方法

第五步

新建rtmp_handle.cpp，加入jni的方法

extern "C"
JNIEXPORT void JNICALL
Java_com_wangheart_rtmpfile_rtmp_RtmpHandle_pushFile(JNIEnv *env, jobject instance, jstring path_) {
    const char *path = env->GetStringUTFChars(path_, 0);
    logw(path);
    // TODO
    publish_using_packet(path);
    env->ReleaseStringUTFChars(path_, path);
}

而publish_using_packet(path);方法調用就是真正的推流邏輯了。

第六步

在MainActivity.java中加一個按鈕來觸發推流

    public void librmtp(View view) {
        new Thread(){
            @Override
            public void run() {
                super.run();
                final String path = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "dongfengpo.flv";
                File file = new File(path);
                LogUtils.d(path + "  " + file.exists());
                RtmpHandle.getInstance().pushFile(path);
            }
        }.start();
    }

既然是耗時操作，當然也是得開線程的。這里推送的文件是《東風破》——周杰倫，這個視頻也是前面flv格式詳解+實例剖析有用到過。

到這里移植基本完成，上一張完成圖：


6.png

RTMPDump的使用細節后面文章我們再討論。感謝大家關注！

//
// Created by eric on 2017/11/24.
//

//
// Created by eric on 2017/11/1.
//
#include <jni.h>
#include <string>
#include<android/log.h>
#include <exception>

//定義日志宏變量
#define logw(content)   __android_log_write(ANDROID_LOG_WARN,"eric",content)
#define loge(content)   __android_log_write(ANDROID_LOG_ERROR,"eric",content)
#define logd(content)   __android_log_write(ANDROID_LOG_DEBUG,"eric",content)

extern "C" {
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include "librtmp/rtmp_sys.h"
#include "librtmp/log.h"
#include <unistd.h>
#define HTON16(x)  ((x>>8&0xff)|(x<<8&0xff00))
#define HTON24(x)  ((x>>16&0xff)|(x<<16&0xff0000)|(x&0xff00))
#define HTON32(x)  ((x>>24&0xff)|(x>>8&0xff00)|\
    (x<<8&0xff0000)|(x<<24&0xff000000))
#define HTONTIME(x) ((x>>16&0xff)|(x<<16&0xff0000)|(x&0xff00)|(x&0xff000000))
}

#include <iostream>

using namespace std;


/*read 1 byte*/
int ReadU8(uint32_t *u8, FILE *fp) {
    if (fread(u8, 1, 1, fp) != 1)
        return 0;
    return 1;
}

/*read 2 byte*/
int ReadU16(uint32_t *u16, FILE *fp) {
    if (fread(u16, 2, 1, fp) != 1)
        return 0;
    *u16 = HTON16(*u16);
    return 1;
}

/*read 3 byte*/
int ReadU24(uint32_t *u24, FILE *fp) {
    if (fread(u24, 3, 1, fp) != 1)
        return 0;
    *u24 = HTON24(*u24);
    return 1;
}

/*read 4 byte*/
int ReadU32(uint32_t *u32, FILE *fp) {
    if (fread(u32, 4, 1, fp) != 1)
        return 0;
    *u32 = HTON32(*u32);
    return 1;
}

/*read 1 byte,and loopback 1 byte at once*/
int PeekU8(uint32_t *u8, FILE *fp) {
    if (fread(u8, 1, 1, fp) != 1)
        return 0;
    fseek(fp, -1, SEEK_CUR);
    return 1;
}

/*read 4 byte and convert to time format*/
int ReadTime(uint32_t *utime, FILE *fp) {
    if (fread(utime, 4, 1, fp) != 1)
        return 0;
    *utime = HTONTIME(*utime);
    return 1;
}

int InitSockets() {
/*    WORD version;
    WSADATA wsaData;
    version=MAKEWORD(2,2);
    return (WSAStartup(version, &wsaData) == 0);*/
    return 1;
}

void CleanupSockets() {
//    WSACleanup();
}

//Publish using RTMP_SendPacket()
int publish_using_packet(const char *path) {
    RTMP *rtmp = NULL;
    RTMPPacket *packet = NULL;
    uint32_t start_time = 0;
    uint32_t now_time = 0;
    //the timestamp of the previous frame
    long pre_frame_time = 0;
    long lasttime = 0;
    int bNextIsKey = 1;
    uint32_t preTagsize = 0;

    //packet attributes
    uint32_t type = 0;
    uint32_t datalength = 0;
    uint32_t timestamp = 0;
    uint32_t streamid = 0;

    FILE *fp = NULL;
    fp = fopen(path, "rb");
    if (!fp) {
        RTMP_LogPrintf("Open File Error.\n");
        CleanupSockets();
        return -1;
    }

    /* set log level */
    //RTMP_LogLevel loglvl=RTMP_LOGDEBUG;
    //RTMP_LogSetLevel(loglvl);

    if (!InitSockets()) {
        RTMP_LogPrintf("Init Socket Err\n");
        return -1;
    }

    rtmp = RTMP_Alloc();
    RTMP_Init(rtmp);
    //set connection timeout,default 30s
    rtmp->Link.timeout = 5;
    if (!RTMP_SetupURL(rtmp, "rtmp://192.168.31.127/live")) {
        RTMP_Log(RTMP_LOGERROR, "SetupURL Err\n");
        RTMP_Free(rtmp);
        CleanupSockets();
        return -1;
    }

    //if unable,the AMF command would be 'play' instead of 'publish'
    RTMP_EnableWrite(rtmp);

    if (!RTMP_Connect(rtmp, NULL)) {
        RTMP_Log(RTMP_LOGERROR, "Connect Err\n");
        RTMP_Free(rtmp);
        CleanupSockets();
        return -1;
    }

    if (!RTMP_ConnectStream(rtmp, 0)) {
        RTMP_Log(RTMP_LOGERROR, "ConnectStream Err\n");
        RTMP_Close(rtmp);
        RTMP_Free(rtmp);
        CleanupSockets();
        return -1;
    }

    packet = (RTMPPacket *) malloc(sizeof(RTMPPacket));
    RTMPPacket_Alloc(packet, 1024 * 64);
    RTMPPacket_Reset(packet);

    packet->m_hasAbsTimestamp = 0;
    packet->m_nChannel = 0x04;
    packet->m_nInfoField2 = rtmp->m_stream_id;

    RTMP_LogPrintf("Start to send data ...\n");

    //jump over FLV Header
    fseek(fp, 9, SEEK_SET);
    //jump over previousTagSizen
    fseek(fp, 4, SEEK_CUR);
    start_time = RTMP_GetTime();
    while (1) {
        //not quite the same as FLV spec
        if (!ReadU8(&type, fp))
            break;
        if (!ReadU24(&datalength, fp))
            break;
        if (!ReadTime(&timestamp, fp))
            break;
        if (!ReadU24(&streamid, fp))
            break;

        if (type != 0x08 && type != 0x09) {
            //jump over non_audio and non_video frame，
            //jump over next previousTagSizen at the same time
            fseek(fp, datalength + 4, SEEK_CUR);
            continue;
        }

        if (fread(packet->m_body, 1, datalength, fp) != datalength)
            break;

        packet->m_headerType = RTMP_PACKET_SIZE_LARGE;
        packet->m_nTimeStamp = timestamp;
        packet->m_packetType = type;
        packet->m_nBodySize = datalength;
        pre_frame_time = timestamp;
        long delt = RTMP_GetTime() - start_time;
        printf("%ld,%ld\n", pre_frame_time, (RTMP_GetTime() - start_time));
        __android_log_print(ANDROID_LOG_WARN, "eric",
                            "%ld,%ld", pre_frame_time, (RTMP_GetTime() - start_time));
        if (delt < pre_frame_time) {
            usleep((pre_frame_time - delt)*1000);
        }
        if (!RTMP_IsConnected(rtmp)) {
            RTMP_Log(RTMP_LOGERROR, "rtmp is not connect\n");
            break;
        }
        if (!RTMP_SendPacket(rtmp, packet, 0)) {
            RTMP_Log(RTMP_LOGERROR, "Send Error\n");
            break;
        }

        if (!ReadU32(&preTagsize, fp))
            break;

        if (!PeekU8(&type, fp))
            break;
        if (type == 0x09) {
            if (fseek(fp, 11, SEEK_CUR) != 0)
                break;
            if (!PeekU8(&type, fp)) {
                break;
            }
            if (type == 0x17)
                bNextIsKey = 1;
            else
                bNextIsKey = 0;

            fseek(fp, -11, SEEK_CUR);
        }
    }

    RTMP_LogPrintf("\nSend Data Over\n");

    if (fp)
        fclose(fp);

    if (rtmp != NULL) {
        RTMP_Close(rtmp);
        RTMP_Free(rtmp);
        rtmp = NULL;
    }
    if (packet != NULL) {
        RTMPPacket_Free(packet);
        free(packet);
        packet = NULL;
    }

    CleanupSockets();
    return 0;
}


int main(int argc, char *argv[]) {
    //2 Methods:
//    publish_using_packet();
    //publish_using_write();
    return 0;
}

extern "C"
JNIEXPORT void JNICALL
Java_com_wangheart_rtmpfile_rtmp_RtmpHandle_pushFile(JNIEnv *env, jobject instance, jstring path_) {
    const char *path = env->GetStringUTFChars(path_, 0);
    logw(path);
    // TODO
    publish_using_packet(path);
    env->ReleaseStringUTFChars(path_, path);
}
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