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/*
* Demux.h
*
* Created on: 2014. 6. 11.
* Author: oskwon
*/
#include <poll.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#include <netinet/ip.h>
#include <linux/dvb/dmx.h>
#include <linux/dvb/version.h>
#include "Util.h"
#include "Logger.h"
#include "Demuxer.h"
using namespace std;
//-------------------------------------------------------------------------------
std::string Demuxer::webif_reauest(std::string request) throw(http_trap)
{
if ((sock = socket(PF_INET, SOCK_STREAM, 0)) < 0)
throw(trap("webif create socket fail."));
struct sockaddr_in sock_addr;
sock_addr.sin_family = AF_INET;
sock_addr.sin_port = htons(80);
sock_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
if (connect(sock, (struct sockaddr*)&sock_addr, sizeof(struct sockaddr_in)))
throw(http_trap("webif connect fail.", 502, "Bad Gateway, webif connect fail"));
if (write(sock, request.c_str(), request.length()) != request.length())
throw(http_trap("webif request fail.", 502, "Bad Gateway, webif request error"));
DEBUG("webif request :\n", request.c_str());
std::string response = "";
struct pollfd pollevt[2];
pollevt[0].fd = sock;
pollevt[0].events = POLLIN;
for (;;) {
char buffer[1024] = {0};
pollevt[0].revents = 0;
int poll_state = poll(pollevt, 1, 1000);
if (poll_state == 0)
break;
else if (poll_state < 0) {
ERROR("webif receive poll error : %s (%d)", strerror(errno), errno);
throw(http_trap("webif response fail.", 502, "Bad Gateway, webif response error"));
}
if (pollevt[0].revents & POLLIN) {
if (read(sock, buffer, 1024) <= 0) {
break;
}
response += buffer;
}
}
return response;
}
//-------------------------------------------------------------------------------
bool Demuxer::already_exist(std::vector<unsigned long> &pidlist, int pid)
{
for(int i = 0; i < pidlist.size(); ++i) {
if(pidlist[i] == pid)
return true;
}
return false;
}
//-------------------------------------------------------------------------------
void Demuxer::set_filter(std::vector<unsigned long> &new_pids) throw(trap)
{
struct dmx_pes_filter_params filter;
ioctl(fd, DMX_SET_BUFFER_SIZE, 1024*1024);
filter.pid = new_pids[0];
filter.input = DMX_IN_FRONTEND;
#if DVB_API_VERSION > 3
filter.output = DMX_OUT_TSDEMUX_TAP;
filter.pes_type = DMX_PES_OTHER;
#else
filter.output = DMX_OUT_TAP;
filter.pes_type = DMX_TAP_TS;
#endif
filter.flags = DMX_IMMEDIATE_START;
if (::ioctl(fd, DMX_SET_PES_FILTER, &filter) < 0)
throw(trap("demux filter setting failed."));
DEBUG("demux filter setting ok.");
for(int i = 0; i < new_pids.size(); ++i) {
uint16_t pid = new_pids[i];
if(already_exist(pids, pid))
continue;
LOG("demux add pid (%x).", pid);
#if DVB_API_VERSION > 3
if (::ioctl(fd, DMX_ADD_PID, &pid) < 0)
throw(trap("demux add pid failed."));
#else
if (::ioctl(fd, DMX_ADD_PID, pid) < 0)
throw(trap("demux add pid failed."));
#endif
}
for(int i = 0; i < pids.size(); ++i) {
uint16_t pid = pids[i];
if(already_exist(new_pids, pid))
continue;
if(i == 4) break;
LOG("demux remove pid (%x).", pid);
#if DVB_API_VERSION > 3
::ioctl(fd, DMX_REMOVE_PID, &pid);
#else
::ioctl(fd, DMX_REMOVE_PID, pid);
#endif
}
DEBUG("demux setting PID ok.");
pids = new_pids;
}
//-------------------------------------------------------------------------------
bool Demuxer::parse_webif_response(std::string& response, std::vector<unsigned long> &new_pids)
{
int start_idx, end_idx;
if ((start_idx = response.rfind('+')) == string::npos)
return false;
if ((end_idx = response.find('\n', start_idx)) == string::npos)
return false;
std::string line = response.substr(start_idx, end_idx - start_idx);
if (line.length() < 3 || line.at(0) != '+')
return false;
/*+0:0:pat,17d4:pmt,17de:video,17e8:audio,17e9:audio,17eb:audio,17ea:audio,17f3:subtitle,17de:pcr,17f2:text*/
demux_id = atoi(line.substr(1,1).c_str());
std::vector<std::string> pidtokens;
if (Util::split(line.c_str() + 3, ',', pidtokens)) {
for (int i = 0; i < pidtokens.size(); ++i) {
std::string pidstr, pidtype;
std::string toekn = pidtokens[i];
if (!Util::split_key_value(toekn, ":", pidstr, pidtype))
continue;
unsigned long pid = strtoul(pidstr.c_str(), 0, 0x10);
if (pid == -1) continue;
if (!video_pid || !audio_pid || !pmt_pid) {
if (pidtype == "pat") {
pat_pid = pid;
}
else if (pidtype == "pmt") {
pmt_pid = pid;
}
else if (pidtype == "video") {
video_pid = pid;
}
else if (pidtype == "audio") {
audio_pid = pid;
}
}
if (!already_exist(new_pids, pid)) {
new_pids.push_back(pid);
}
DEBUG("find pid : %s - %04X", toekn.c_str(), pid);
}
}
return true;
}
//-------------------------------------------------------------------------------
Demuxer::Demuxer(HttpHeader *header) throw(http_trap)
{
demux_id = pat_pid = fd = sock = -1;
pmt_pid = audio_pid = video_pid = 0;
std::string webif_request = string("GET /web/stream?StreamService=") + header->path.substr(1) + " HTTP/1.0\r\n";
if (header->params.find("Authorization") != header->params.end()) {
if (header->params["Authorization"].length() < 5) {
throw(http_trap("no authorization data.", 401, "Unauthorized"));
}
webif_request += "Authorization: " + header->params["Authorization"] + "\r\n";
if (header->params["Cookie"].length() > 0) {
webif_request += "Cookie: " + header->params["Cookie"] + "\r\n";
}
}
webif_request += "\r\n";
std::string webif_response = webif_reauest(webif_request);
DEBUG("webif response :\n%s", webif_response.c_str());
if (webif_response.find("WWW-Authenticate") != std::string::npos) {
header->authorization = webif_response;
throw(http_trap("webif whthentication fail.", 401, "Unauthorized"));
}
std::vector<unsigned long> new_pids;
if (!parse_webif_response(webif_response, new_pids))
throw(http_trap("webif response parsing fail.", 503, "Service Unavailable"));
std::string demuxpath = "/dev/dvb/adapter0/demux" + Util::ultostr(demux_id);
if ((fd = open(demuxpath.c_str(), O_RDWR | O_NONBLOCK)) < 0) {
throw(http_trap(std::string("demux open fail : ") + demuxpath, 503, "Service Unavailable"));
}
INFO("demux open success : %s", demuxpath.c_str());
try {
set_filter(new_pids);
}
catch (const trap &e) {
throw(http_trap(e.what(), 503, "Service Unavailable"));
}
}
//-------------------------------------------------------------------------------
Demuxer::~Demuxer() throw()
{
if (fd != -1) close(fd);
if (sock != -1) close(sock);
fd = sock = -1;
}
//-------------------------------------------------------------------------------
int Demuxer::get_fd() const throw()
{
return fd;
}
//-------------------------------------------------------------------------------
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