275 lines
9.3 KiB
C++
275 lines
9.3 KiB
C++
#include <fcntl.h>
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#include <iostream>
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#include <string>
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#include <vector>
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#include <cstdlib>
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#include <cstdio>
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#include <string.h>
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#include <unistd.h>
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#include <signal.h>
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#include "../util/flv_tag.h" //FLV format parser
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#include "../util/ddv_socket.h" //DDV Socket lib
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#include <sys/epoll.h>
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namespace Buffer{
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void termination_handler (int signum){
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switch (signum){
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case SIGPIPE: return; break;
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default: return; break;
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}
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}
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///holds FLV::Tag objects and their numbers
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struct buffer{
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int number;
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FLV::Tag FLV;
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};//buffer
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/// Holds connected users.
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/// Keeps track of what buffer users are using and the connection status.
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class user{
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public:
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int MyBuffer; ///< Index of currently used buffer.
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int MyBuffer_num; ///< Number of currently used buffer.
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int MyBuffer_len; ///< Length in bytes of currently used buffer.
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int MyNum; ///< User ID of this user.
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int currsend; ///< Current amount of bytes sent.
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bool gotproperaudio; ///< Whether the user received proper audio yet.
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void * lastpointer; ///< Pointer to data part of current buffer.
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static int UserCount; ///< Global user counter.
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DDV::Socket S; ///< Connection to user
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/// Creates a new user from a newly connected socket.
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/// Also prints "User connected" text to stdout.
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user(DDV::Socket fd){
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S = fd;
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MyNum = UserCount++;
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gotproperaudio = false;
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std::cout << "User " << MyNum << " connected" << std::endl;
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}//constructor
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/// Disconnects the current user. Doesn't do anything if already disconnected.
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/// Prints "Disconnected user" to stdout if disconnect took place.
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void Disconnect(std::string reason) {
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if (S.connected()) {
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S.close();
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std::cout << "Disconnected user " << MyNum << ": " << reason << std::endl;
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}
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}//Disconnect
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/// Tries to send the current buffer, returns true if success, false otherwise.
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/// Has a side effect of dropping the connection if send will never complete.
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bool doSend(){
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int r = S.iwrite((char*)lastpointer+currsend, MyBuffer_len-currsend);
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if (r <= 0){
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if ((r < 0) && (errno == EWOULDBLOCK)){return false;}
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Disconnect("Connection closed");
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return false;
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}
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currsend += r;
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return (currsend == MyBuffer_len);
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}//doSend
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/// Try to send data to this user. Disconnects if any problems occur.
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/// \param ringbuf Array of buffers (FLV:Tag with ID attached)
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/// \param buffers Count of elements in ringbuf
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void Send(buffer ** ringbuf, int buffers){
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//TODO: Bij MP3: gotproperaudio - if false, stuur alleen als eerste byte is 0xFF en set op true
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if (!S.connected()){return;}//cancel if not connected
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//still waiting for next buffer? check it
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if (MyBuffer_num < 0){
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MyBuffer_num = ringbuf[MyBuffer]->number;
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if (MyBuffer_num < 0){
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return; //still waiting? don't crash - wait longer.
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}else{
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MyBuffer_len = ringbuf[MyBuffer]->FLV.len;
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lastpointer = ringbuf[MyBuffer]->FLV.data;
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}
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}
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//do check for buffer resizes
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if (lastpointer != ringbuf[MyBuffer]->FLV.data){
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Disconnect("Buffer resize at wrong time... had to disconnect");
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return;
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}
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//try to complete a send
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if (doSend()){
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//switch to next buffer
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if ((ringbuf[MyBuffer]->number != MyBuffer_num)){
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//if corrupt data, warn and find keyframe
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std::cout << "Warning: User " << MyNum << " was send corrupt video data and send to the next keyframe!" << std::endl;
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int nocrashcount = 0;
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do{
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MyBuffer++;
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nocrashcount++;
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MyBuffer %= buffers;
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}while(!ringbuf[MyBuffer]->FLV.isKeyframe && (nocrashcount < buffers));
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//if keyframe not available, try again later
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if (nocrashcount >= buffers){
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std::cout << "Warning: No keyframe found in buffers! Skipping search for now..." << std::endl;
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return;
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}
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}else{
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MyBuffer++;
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MyBuffer %= buffers;
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}
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MyBuffer_num = -1;
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lastpointer = 0;
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currsend = 0;
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}//completed a send
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}//send
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};
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int user::UserCount = 0;
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/// Starts a loop, waiting for connections to send video data to.
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int Start(int argc, char ** argv) {
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//first make sure no segpipe signals will kill us
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struct sigaction new_action;
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new_action.sa_handler = termination_handler;
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sigemptyset (&new_action.sa_mask);
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new_action.sa_flags = 0;
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sigaction (SIGPIPE, &new_action, NULL);
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//then check and parse the commandline
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if (argc < 3) {
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std::cout << "usage: " << argv[0] << " buffers_count streamname" << std::endl;
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return 1;
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}
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std::string shared_socket = "/tmp/shared_socket_";
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shared_socket += argv[2];
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DDV::ServerSocket SS(shared_socket, true);
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FLV::Tag metadata;
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FLV::Tag video_init;
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FLV::Tag audio_init;
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int buffers = atoi(argv[1]);
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buffer ** ringbuf = (buffer**) calloc (buffers,sizeof(buffer*));
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std::vector<user> users;
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std::vector<user>::iterator usersIt;
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for (int i = 0; i < buffers; ++i) ringbuf[i] = new buffer;
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int current_buffer = 0;
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int lastproper = 0;//last properly finished buffer number
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unsigned int loopcount = 0;
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DDV::Socket incoming;
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unsigned char packtype;
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bool gotVideoInfo = false;
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bool gotAudioInfo = false;
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int infile = fileno(stdin);//get file number for stdin
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//add stdin to an epoll
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int poller = epoll_create(1);
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struct epoll_event ev;
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ev.events = EPOLLIN;
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ev.data.fd = infile;
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epoll_ctl(poller, EPOLL_CTL_ADD, infile, &ev);
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struct epoll_event events[1];
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while(!feof(stdin) && !FLV::Parse_Error){
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//invalidate the current buffer
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ringbuf[current_buffer]->number = -1;
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if ((epoll_wait(poller, events, 1, 10) > 0) && ringbuf[current_buffer]->FLV.FileLoader(stdin)){
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loopcount++;
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packtype = ringbuf[current_buffer]->FLV.data[0];
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//store metadata, if available
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if (packtype == 0x12){
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metadata = ringbuf[current_buffer]->FLV;
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std::cout << "Received metadata!" << std::endl;
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if (gotVideoInfo && gotAudioInfo){
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FLV::Parse_Error = true;
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std::cout << "... after proper video and audio? Cancelling broadcast!" << std::endl;
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}
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gotVideoInfo = false;
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gotAudioInfo = false;
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}
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//store video init data, if available
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if (!gotVideoInfo && ringbuf[current_buffer]->FLV.isKeyframe){
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if ((ringbuf[current_buffer]->FLV.data[11] & 0x0f) == 7){//avc packet
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if (ringbuf[current_buffer]->FLV.data[12] == 0){
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ringbuf[current_buffer]->FLV.tagTime(0);//timestamp to zero
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video_init = ringbuf[current_buffer]->FLV;
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gotVideoInfo = true;
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std::cout << "Received video configuration!" << std::endl;
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}
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}else{gotVideoInfo = true;}//non-avc = no config...
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}
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//store audio init data, if available
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if (!gotAudioInfo && (packtype == 0x08)){
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if (((ringbuf[current_buffer]->FLV.data[11] & 0xf0) >> 4) == 10){//aac packet
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ringbuf[current_buffer]->FLV.tagTime(0);//timestamp to zero
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audio_init = ringbuf[current_buffer]->FLV;
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gotAudioInfo = true;
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std::cout << "Received audio configuration!" << std::endl;
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}else{gotAudioInfo = true;}//no aac = no config...
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}
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//on keyframe set possible start point
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if (packtype == 0x09){
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if (((ringbuf[current_buffer]->FLV.data[11] & 0xf0) >> 4) == 1){
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lastproper = current_buffer;
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}
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}
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//keep track of buffers
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ringbuf[current_buffer]->number = loopcount;
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current_buffer++;
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current_buffer %= buffers;
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}
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//check for new connections, accept them if there are any
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incoming = SS.accept(true);
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if (incoming.connected()){
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users.push_back(incoming);
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//send the FLV header
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users.back().currsend = 0;
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users.back().MyBuffer = lastproper;
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users.back().MyBuffer_num = -1;
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//TODO: Do this more nicely?
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if (!incoming.write(FLV::Header, 13)){
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users.back().Disconnect("failed to receive the header!");
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}else{
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if (!incoming.write(metadata.data, metadata.len)){
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users.back().Disconnect("failed to receive metadata!");
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}
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if (!incoming.write(video_init.data, video_init.len)){
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users.back().Disconnect("failed to receive video init!");
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}
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if (!incoming.write(audio_init.data, audio_init.len)){
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users.back().Disconnect("failed to receive audio init!");
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}
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}
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}
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//send all connections what they need, if and when they need it
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if (users.size() > 0){
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for (usersIt = users.begin(); usersIt != users.end(); usersIt++){
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if (!(*usersIt).S.connected()){
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users.erase(usersIt); break;
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}else{
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(*usersIt).Send(ringbuf, buffers);
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}
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}
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}
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}//main loop
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// disconnect listener
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if (FLV::Parse_Error){
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std::cout << "FLV parse error" << std::endl;
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}else{
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std::cout << "Reached EOF of input" << std::endl;
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}
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SS.close();
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while (users.size() > 0){
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for (usersIt = users.begin(); usersIt != users.end(); usersIt++){
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(*usersIt).Disconnect("Shutting down...");
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if (!(*usersIt).S.connected()){users.erase(usersIt);break;}
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}
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}
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return 0;
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}
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};//Buffer namespace
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int main(int argc, char ** argv){
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Buffer::Start(argc, argv);
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}//main
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