455 lines
17 KiB
C++
455 lines
17 KiB
C++
/// \file conn_http_dynamic.cpp
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/// Contains the main code for the HTTP Dynamic Connector
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#include <iostream>
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#include <iomanip>
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#include <sstream>
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#include <queue>
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#include <cstdlib>
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#include <cstdio>
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#include <cmath>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <getopt.h>
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#include <mist/socket.h>
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#include <mist/http_parser.h>
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#include <mist/json.h>
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#include <mist/dtsc.h>
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#include <mist/mp4.h>
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#include <mist/config.h>
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#include <sstream>
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#include <mist/stream.h>
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#include <mist/timing.h>
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#include <mist/ts_packet.h>
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/// Holds everything unique to HTTP Connectors.
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namespace Connector_HTTP {
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/// Parses the list of keyframes into 10 second fragments
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std::vector<int> keyframesToFragments(JSON::Value & metadata){
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std::vector<int> result;
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if (metadata.isNull()){
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return result;
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}
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result.push_back(0);
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int currentBase = 0;
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for (int i = 0; i < metadata["keytime"].size(); i++){
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if ((metadata["keytime"][i].asInt() - currentBase) > 10000){
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currentBase = metadata["keytime"][i].asInt();
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result.push_back(i);
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}
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}
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return result;
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}
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/// Returns a m3u or m3u8 index file
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std::string BuildIndex(std::string & MovieId, JSON::Value & metadata){
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std::stringstream Result;
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std::vector<int> fragIndices = keyframesToFragments(metadata);
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int longestFragment = 0;
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for (int i = 1; i < fragIndices.size(); i++){
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int fragDuration = metadata["keytime"][fragIndices[i]].asInt() - metadata["keytime"][fragIndices[i - 1]].asInt();
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if (fragDuration > longestFragment){
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longestFragment = fragDuration;
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}
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}
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if (metadata.isMember("length") && metadata["length"].asInt() > 0){
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Result << "#EXTM3U\r\n"
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//"#EXT-X-VERSION:1\r\n"
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//"#EXT-X-ALLOW-CACHE:YES\r\n"
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"#EXT-X-TARGETDURATION:" << (longestFragment / 1000) + 1 << "\r\n"
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"#EXT-X-MEDIA-SEQUENCE:0\r\n";
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//"#EXT-X-PLAYLIST-TYPE:VOD\r\n";
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int lastDuration = 0;
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bool writeOffset = true;
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for (int i = 0; i < fragIndices.size() - 1; i++){
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Result << "#EXTINF:" << (metadata["keytime"][fragIndices[i + 1]].asInt() - lastDuration) / 1000 << ", no desc\r\n" << fragIndices[i] << "_"
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<< fragIndices[i + 1] - fragIndices[i] << ".ts\r\n";
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lastDuration = metadata["keytime"][fragIndices[i + 1]].asInt();
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}
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Result << "#EXT-X-ENDLIST";
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}else{
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Result << "#EXTM3U\r\n"
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"#EXT-X-VERSION:4\r\n"
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"#EXT-X-MEDIA-SEQUENCE:0\r\n"
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"#EXT-X-TARGETDURATION:" << ((metadata["video"]["keyms"].asInt() + metadata["video"]["keyvar"].asInt()) / 1000) + 1 << "\r\n";
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}
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#if DEBUG >= 8
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std::cerr << "Sending this index:" << std::endl << Result.str() << std::endl;
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#endif
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return Result.str();
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} //BuildIndex
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/// Main function for Connector_HTTP_Live
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int Connector_HTTP_Live(Socket::Connection conn){
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std::stringstream TSBuf;
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long long int TSBufTime = 0;
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DTSC::Stream Strm; //Incoming stream buffer.
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HTTP::Parser HTTP_R, HTTP_S; //HTTP Receiver en HTTP Sender.
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bool ready4data = false; //Set to true when streaming is to begin.
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bool pending_manifest = false;
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bool receive_marks = false; //when set to true, this stream will ignore keyframes and instead use pause marks
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bool inited = false;
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Socket::Connection ss( -1);
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std::string streamname;
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std::string recBuffer = "";
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std::string ToPack;
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TS::Packet PackData;
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std::string DTMIData;
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int PacketNumber = 0;
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long long unsigned int TimeStamp = 0;
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int ThisNaluSize;
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char VideoCounter = 0;
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char AudioCounter = 0;
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bool WritePesHeader;
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bool IsKeyFrame;
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bool FirstKeyFrame = true;
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bool FirstIDRInKeyFrame;
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MP4::AVCC avccbox;
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bool haveAvcc = false;
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std::vector<int> fragIndices;
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std::string manifestType;
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int Segment = -1;
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int temp;
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int Flash_RequestPending = 0;
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unsigned int lastStats = 0;
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conn.setBlocking(false); //do not block on conn.spool() when no data is available
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while (conn.connected()){
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if (conn.spool() || conn.Received().size()){
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//make sure it ends in a \n
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if ( *(conn.Received().get().rbegin()) != '\n'){
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std::string tmp = conn.Received().get();
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conn.Received().get().clear();
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if (conn.Received().size()){
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conn.Received().get().insert(0, tmp);
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}else{
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conn.Received().append(tmp);
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}
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}
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if (HTTP_R.Read(conn.Received().get())){
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#if DEBUG >= 4
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std::cout << "Received request: " << HTTP_R.getUrl() << std::endl;
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#endif
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conn.setHost(HTTP_R.GetHeader("X-Origin"));
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if (HTTP_R.url.find(".m3u") == std::string::npos){
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streamname = HTTP_R.url.substr(5, HTTP_R.url.find("/", 5) - 5);
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if ( !ss){
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ss = Util::Stream::getStream(streamname);
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if ( !ss.connected()){
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#if DEBUG >= 1
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fprintf(stderr, "Could not connect to server!\n");
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#endif
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HTTP_S.Clean();
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HTTP_S.SetBody("No such stream is available on the system. Please try again.\n");
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conn.SendNow(HTTP_S.BuildResponse("404", "Not found"));
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ready4data = false;
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continue;
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}
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ss.setBlocking(false);
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inited = true;
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}
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temp = HTTP_R.url.find("/", 5) + 1;
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Segment = atoi(HTTP_R.url.substr(temp, HTTP_R.url.find("_", temp) - temp).c_str());
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temp = HTTP_R.url.find("_", temp) + 1;
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int frameCount = atoi(HTTP_R.url.substr(temp, HTTP_R.url.find(".ts", temp) - temp).c_str());
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std::stringstream sstream;
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sstream << "f " << Segment + 1 << "\n";
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for (int i = 0; i < frameCount; i++){
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sstream << "o \n";
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}
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ss.SendNow(sstream.str().c_str());
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Flash_RequestPending++;
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}else{
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streamname = HTTP_R.url.substr(5, HTTP_R.url.find("/", 5) - 5);
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if (HTTP_R.url.find(".m3u8") != std::string::npos){
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manifestType = "audio/x-mpegurl";
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}else{
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manifestType = "audio/mpegurl";
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}
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if ( !Strm.metadata.isNull()){
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HTTP_S.Clean();
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HTTP_S.SetHeader("Content-Type", manifestType);
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HTTP_S.SetHeader("Cache-Control", "no-cache");
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if (Strm.metadata.isMember("length")){
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receive_marks = true;
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}
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std::string manifest = BuildIndex(streamname, Strm.metadata);
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HTTP_S.SetBody(manifest);
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conn.SendNow(HTTP_S.BuildResponse("200", "OK"));
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#if DEBUG >= 3
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printf("Sent index\n");
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#endif
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pending_manifest = false;
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}else{
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pending_manifest = true;
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}
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}
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ready4data = true;
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HTTP_R.Clean(); //clean for any possible next requests
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}
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}else{
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if (Flash_RequestPending){
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usleep(1000); //sleep 1ms
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}else{
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usleep(10000); //sleep 10ms
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}
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}
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if (ready4data){
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if ( !inited){
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//we are ready, connect the socket!
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ss = Util::Stream::getStream(streamname);
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if ( !ss.connected()){
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#if DEBUG >= 1
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fprintf(stderr, "Could not connect to server!\n");
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#endif
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ss.close();
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HTTP_S.Clean();
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HTTP_S.SetBody("No such stream is available on the system. Please try again.\n");
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conn.SendNow(HTTP_S.BuildResponse("404", "Not found"));
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ready4data = false;
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continue;
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}
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ss.setBlocking(false);
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#if DEBUG >= 3
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fprintf(stderr, "Everything connected, starting to send video data...\n");
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#endif
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inited = true;
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}
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unsigned int now = Util::epoch();
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if (now != lastStats){
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lastStats = now;
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ss.SendNow(conn.getStats("HTTP_Live").c_str());
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}
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if (ss.spool()){
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while (Strm.parsePacket(ss.Received())){
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if (Strm.getPacket(0).isMember("time")){
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if ( !Strm.metadata.isMember("firsttime")){
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Strm.metadata["firsttime"] = Strm.getPacket(0)["time"];
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}else{
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if ( !Strm.metadata.isMember("length") || Strm.metadata["length"].asInt() == 0){
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Strm.getPacket(0)["time"] = Strm.getPacket(0)["time"].asInt() - Strm.metadata["firsttime"].asInt();
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}
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}
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Strm.metadata["lasttime"] = Strm.getPacket(0)["time"];
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}
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if (pending_manifest){
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HTTP_S.Clean();
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HTTP_S.protocol = "HTTP/1.1";
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HTTP_S.SetHeader("Cache-Control", "no-cache");
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if (Strm.metadata.isMember("length")){
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receive_marks = true;
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}
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std::string manifest = BuildIndex(streamname, Strm.metadata);
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HTTP_S.SetHeader("Content-Type", manifestType);
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HTTP_S.SetHeader("Connection", "keep-alive");
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HTTP_S.SetBody(manifest);
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conn.SendNow(HTTP_S.BuildResponse("200", "OK"));
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#if DEBUG >= 3
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printf("Sent manifest\n");
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#endif
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pending_manifest = false;
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}
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if ( !receive_marks && Strm.metadata.isMember("length")){
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receive_marks = true;
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}
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if ((Strm.getPacket(0).isMember("keyframe") && !receive_marks) || Strm.lastType() == DTSC::PAUSEMARK){
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TSBuf.flush();
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#if DEBUG >= 4
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fprintf(stderr, "Received a %s fragment of %i bytes.\n", Strm.getPacket(0)["datatype"].asString().c_str(), TSBuf.str().size());
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#endif
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if (Flash_RequestPending > 0 && TSBuf.str().size()){
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#if DEBUG >= 3
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fprintf(stderr, "Sending a fragment...");
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#endif
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HTTP_S.Clean();
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HTTP_S.protocol = "HTTP/1.1";
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HTTP_S.SetHeader("Content-Type", "video/mp2t");
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HTTP_S.SetHeader("Connection", "keep-alive");
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HTTP_S.SetBody("");
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HTTP_S.SetHeader("Content-Length", TSBuf.str().size());
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conn.SendNow(HTTP_S.BuildResponse("200", "OK"));
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conn.SendNow(TSBuf.str().c_str(), TSBuf.str().size());
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TSBuf.str("");
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Flash_RequestPending--;
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PacketNumber = 0;
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#if DEBUG >= 3
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fprintf(stderr, "Done\n");
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#endif
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}
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TSBuf.str("");
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}
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if ( !haveAvcc){
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avccbox.setPayload(Strm.metadata["video"]["init"].asString());
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haveAvcc = true;
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}
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if (Strm.lastType() == DTSC::VIDEO || Strm.lastType() == DTSC::AUDIO){
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if (Strm.lastType() == DTSC::VIDEO){
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DTMIData = Strm.lastData();
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if (Strm.getPacket(0).isMember("keyframe")){
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IsKeyFrame = true;
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FirstIDRInKeyFrame = true;
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}else{
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IsKeyFrame = false;
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FirstKeyFrame = false;
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}
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if (IsKeyFrame){
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TimeStamp = (Strm.getPacket(0)["time"].asInt() * 27000);
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}
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int TSType;
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bool FirstPic = true;
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while (DTMIData.size()){
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ThisNaluSize = (DTMIData[0] << 24) + (DTMIData[1] << 16) + (DTMIData[2] << 8) + DTMIData[3];
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DTMIData.erase(0, 4); //Erase the first four characters;
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TSType = (int)DTMIData[0] & 0x1F;
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if (TSType == 0x05){
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if (FirstPic){
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ToPack += avccbox.asAnnexB();
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FirstPic = false;
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}
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}
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ToPack.append(TS::NalHeader, 4);
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ToPack.append(DTMIData, 0, ThisNaluSize);
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DTMIData.erase(0, ThisNaluSize);
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}
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WritePesHeader = true;
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while (ToPack.size()){
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if ((PacketNumber % 42) == 0){
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PackData.DefaultPAT();
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TSBuf.write(PackData.ToString(), 188);
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PackData.DefaultPMT();
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TSBuf.write(PackData.ToString(), 188);
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PacketNumber += 2;
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}
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PackData.Clear();
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PackData.PID(0x100);
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PackData.ContinuityCounter(VideoCounter);
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VideoCounter++;
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if (WritePesHeader){
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PackData.UnitStart(1);
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if (IsKeyFrame){
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PackData.RandomAccess(1);
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PackData.PCR(TimeStamp);
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}else{
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PackData.AdaptationField(1);
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}
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PackData.AddStuffing(184 - (20 + ToPack.size()));
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PackData.PESVideoLeadIn(ToPack.size(), Strm.getPacket(0)["time"].asInt() * 90);
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WritePesHeader = false;
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}else{
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PackData.AdaptationField(1);
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PackData.AddStuffing(184 - (ToPack.size()));
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}
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PackData.FillFree(ToPack);
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TSBuf.write(PackData.ToString(), 188);
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PacketNumber++;
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}
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}else if (Strm.lastType() == DTSC::AUDIO){
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WritePesHeader = true;
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DTMIData = Strm.lastData();
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ToPack = TS::GetAudioHeader(DTMIData.size(), Strm.metadata["audio"]["init"].asString());
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ToPack += DTMIData;
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while (ToPack.size()){
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if ((PacketNumber % 42) == 0){
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PackData.DefaultPAT();
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TSBuf.write(PackData.ToString(), 188);
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PackData.DefaultPMT();
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TSBuf.write(PackData.ToString(), 188);
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PacketNumber += 2;
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}
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PackData.Clear();
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PackData.PID(0x101);
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PackData.ContinuityCounter(AudioCounter);
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AudioCounter++;
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if (WritePesHeader){
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PackData.UnitStart(1);
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PackData.AddStuffing(184 - (14 + ToPack.size()));
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PackData.PESAudioLeadIn(ToPack.size(), Strm.getPacket(0)["time"].asInt() * 90);
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WritePesHeader = false;
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}else{
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PackData.AdaptationField(1);
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PackData.AddStuffing(184 - ToPack.size());
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}
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PackData.FillFree(ToPack);
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TSBuf.write(PackData.ToString(), 188);
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PacketNumber++;
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}
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}
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}
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}
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if (pending_manifest && !Strm.metadata.isNull()){
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HTTP_S.Clean();
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HTTP_S.protocol = "HTTP/1.1";
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HTTP_S.SetHeader("Cache-Control", "no-cache");
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if (Strm.metadata.isMember("length")){
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receive_marks = true;
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}
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HTTP_S.SetHeader("Content-Type", manifestType);
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HTTP_S.SetHeader("Connection", "keep-alive");
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std::string manifest = BuildIndex(streamname, Strm.metadata);
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HTTP_S.SetBody(manifest);
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conn.SendNow(HTTP_S.BuildResponse("200", "OK"));
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#if DEBUG >= 3
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printf("Sent index\n");
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#endif
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pending_manifest = false;
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}
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}
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if ( !ss.connected()){
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break;
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}
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}
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}
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conn.close();
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ss.SendNow(conn.getStats("HTTP_Live").c_str());
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ss.close();
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#if DEBUG >= 1
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fprintf(stderr, "User %i disconnected.\n", conn.getSocket());
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if (inited){
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fprintf(stderr, "Status was: inited\n");
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}else{
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if (ready4data){
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fprintf(stderr, "Status was: ready4data\n");
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}else{
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fprintf(stderr, "Status was: connected\n");
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}
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}
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#endif
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return 0;
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} //Connector_HTTP_Dynamic main function
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} //Connector_HTTP_Dynamic namespace
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int main(int argc, char ** argv){
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Util::Config conf(argv[0], PACKAGE_VERSION);
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conf.addConnectorOptions(1935);
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conf.parseArgs(argc, argv);
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Socket::Server server_socket = Socket::Server("/tmp/mist/http_live");
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if ( !server_socket.connected()){
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return 1;
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}
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conf.activate();
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while (server_socket.connected() && conf.is_active){
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Socket::Connection S = server_socket.accept();
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if (S.connected()){ //check if the new connection is valid
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pid_t myid = fork();
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if (myid == 0){ //if new child, start MAINHANDLER
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return Connector_HTTP::Connector_HTTP_Live(S);
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}else{ //otherwise, do nothing or output debugging text
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#if DEBUG >= 3
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fprintf(stderr, "Spawned new process %i for socket %i\n", (int)myid, S.getSocket());
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#endif
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}
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}
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} //while connected
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server_socket.close();
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return 0;
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} //main
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