From 21f6a1fe9d2b0346ee5b218d4815d6f622cc294a Mon Sep 17 00:00:00 2001
From: Peter Wu <lekensteyn@gmail.com>
Date: Sun, 26 Aug 2012 00:05:23 +0200
Subject: [PATCH] player: initial implementation

---
 src/Makefile.am |   4 +-
 src/player.cpp  | 124 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/player.h    |  25 ++++++++++
 3 files changed, 152 insertions(+), 1 deletion(-)
 create mode 100644 src/player.cpp
 create mode 100644 src/player.h

diff --git a/src/Makefile.am b/src/Makefile.am
index a0c9a638..be9d6a23 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -8,7 +8,7 @@ EXTRA_DIST=server.html server.html.h embed.js.h
 AM_CPPFLAGS = $(MIST_CFLAGS)
 LDADD = $(MIST_LIBS)
 SUBDIRS=converters analysers
-bin_PROGRAMS=MistBuffer MistController MistConnRAW MistConnRTMP MistConnHTTP MistConnHTTPProgressive MistConnHTTPDynamic
+bin_PROGRAMS=MistBuffer MistController MistConnRAW MistConnRTMP MistConnHTTP MistConnHTTPProgressive MistConnHTTPDynamic MistPlayer
 MistBuffer_SOURCES=buffer.cpp buffer_user.h buffer_user.cpp buffer_stream.h buffer_stream.cpp tinythread.cpp tinythread.h ../VERSION
 MistBuffer_LDADD=$(MIST_LIBS) -lpthread
 MistController_SOURCES=controller.cpp ../VERSION ./server.html.h
@@ -18,6 +18,8 @@ MistConnHTTP_SOURCES=conn_http.cpp tinythread.cpp tinythread.h ../VERSION ./embe
 MistConnHTTP_LDADD=$(MIST_LIBS) -lpthread
 MistConnHTTPProgressive_SOURCES=conn_http_progressive.cpp ../VERSION
 MistConnHTTPDynamic_SOURCES=conn_http_dynamic.cpp ../VERSION
+MistPlayer_SOURCES=player.h player.cpp
+MistPlayer_LDADD=$(MIST_LIBS)
 
 lspSOURCES=$(lspdir)/jquery.js $(lspdir)/placeholder.js $(lspdir)/md5.js $(lspdir)/main.js $(lspdir)/functions.js
 lspDATA=$(lspdir)/header.html $(lspdir)/style.css $(lspdir)/footer.html
diff --git a/src/player.cpp b/src/player.cpp
new file mode 100644
index 00000000..d0ab4155
--- /dev/null
+++ b/src/player.cpp
@@ -0,0 +1,124 @@
+
+#include <iostream>
+#include <fstream>
+#include <algorithm>
+
+#include <sys/time.h>
+#include <mist/dtsc.h>
+#include "player.h"
+
+namespace Player{
+  ///\todo Make getNowMS available in a library
+  /// Gets the current system time in milliseconds.
+  long long int getNowMS(){
+    timeval t;
+    gettimeofday(&t, 0);
+    return t.tv_sec * 1000 + t.tv_usec/1000;
+  }//getNowMS
+
+  File::File(std::string filename){
+    stream = new DTSC::Stream(5);
+    ring = NULL;// ring will be initialized when necessary
+    fileSrc.open(filename.c_str(), std::ifstream::in | std::ifstream::binary);
+    std::cout.setf(std::ios::unitbuf);//do not choke
+    nextPacket();// initial read always returns nothing
+    if (!nextPacket()){//parse metadata
+      std::cout << stream->outHeader();
+    } else {
+      std::cerr << "Error: Expected metadata!" << std::endl;
+    }
+  };
+  File::~File() {
+    if (ring) {
+      stream->dropRing(ring);
+      ring = NULL;
+    }
+    delete stream;
+  }
+  // \returns True if there is a packet available for pull.
+  bool File::nextPacket(){
+    if (fileSrc.good()){
+      if (stream->parsePacket(inBuffer)){
+        return true;
+      } else {
+        char buffer[1024 * 10];
+        fileSrc.read(buffer, sizeof(buffer));
+        inBuffer.append(buffer, fileSrc.gcount());
+      }
+    }
+    return false;
+  }
+  void File::seek(int position){
+    // XXX: implement seek.
+  };
+  std::string * File::getPacket(){
+    if (ring->waiting){
+      return NULL;
+    }//still waiting for next buffer?
+    if (ring->starved){
+      //if corrupt data, warn and get new DTSC::Ring
+      std::cerr << "Warning: User was send corrupt video data and send to the next keyframe!" << std::endl;
+      stream->dropRing(ring);
+      ring = stream->getRing();
+      return NULL;
+    }
+    //switch to next buffer
+    if (ring->b < 0){
+      ring->waiting = true;
+      return NULL;
+    }//no next buffer? go in waiting mode.
+    // get current packet
+    std::string * packet = &stream->outPacket(ring->b);
+    // make next request take a different packet
+    ring->b--;
+    return packet;
+  }
+
+  /// Reads a command from stdin. Returns true if a command was read.
+  bool File::readCommand() {
+    // XXX: implement seek.
+    return false;
+  }
+
+  void File::Play() {
+    long long now, timeDiff = 0, lastTime = 0;
+    while (fileSrc.good()) {
+      if (readCommand()) {
+        continue;
+      }
+      now = getNowMS();
+      if (now - timeDiff >= lastTime || lastTime - (now - timeDiff) > 5000) {
+        if (nextPacket()) {
+          std::string * packet;
+          if (!ring){ring = stream->getRing();}//get ring after reading first non-metadata
+          packet = getPacket();
+          if (!packet){
+            continue;
+          }
+          lastTime = stream->getTime();
+          if (std::abs(now - timeDiff - lastTime) > 5000) {
+            timeDiff = now - lastTime;
+          }
+          std::cout.write(packet->c_str(), packet->length());
+        }
+      } else {
+        usleep(std::min(999LL, lastTime - (now - timeDiff)) * 1000);
+      }
+    }
+  }
+};
+
+int main(int argc, char** argv){
+  if (argc < 2){
+    std::cerr << "Usage: " << argv[0] << " filename.dtsc" << std::endl;
+    return 1;
+  }
+  std::string filename = argv[1];
+  #if DEBUG >= 3
+  std::cerr << "VoD " << filename << std::endl;
+  #endif
+  Player::File file(filename);
+  file.Play();
+  return 0;
+}
+
diff --git a/src/player.h b/src/player.h
new file mode 100644
index 00000000..ebcd5176
--- /dev/null
+++ b/src/player.h
@@ -0,0 +1,25 @@
+/// \file player.h
+/// Provides functionality for playing files for Video on Demand
+
+#pragma once
+
+#include "buffer_stream.h"
+
+namespace Player{
+  class File{
+  private:
+    std::ifstream fileSrc; ///<File handle of the input file.
+    std::string inBuffer; ///<Buffer of unprocessed bytes read from input.
+    DTSC::Stream * stream;
+    DTSC::Ring * ring;
+    bool nextPacket(); ///<Pulls the next packet into the queue.
+    bool getPacketFromInput(); ///<Attempts to retrieve a packet from input.
+    bool readCommand();
+  public:
+    File(std::string filename); ///<Attempts to open a DTSC file
+    void Play();
+    ~File();
+    void seek(int position);
+    std::string * getPacket();
+  };
+};
\ No newline at end of file