232 lines
8.6 KiB
C++
232 lines
8.6 KiB
C++
#include <mist/procs.h>
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#include <mist/config.h>
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#include <mist/timing.h>
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#include <mist/stream.h>
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#include <mist/dtsc.h>
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#include <mist/defines.h>
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#include <mist/shared_memory.h>
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#include "controller_streams.h"
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#include "controller_capabilities.h"
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#include "controller_storage.h"
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#include "controller_statistics.h"
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#include "controller_limits.h" /*LTS*/
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#include <sys/stat.h>
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#include <map>
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///\brief Holds everything unique to the controller.
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namespace Controller {
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///\brief Checks whether two streams are equal.
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///\param one The first stream for the comparison.
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///\param two The second stream for the comparison.
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///\return True if the streams are equal, false otherwise.
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bool streamsEqual(JSON::Value & one, JSON::Value & two){
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if (one.isMember("source") != two.isMember("source") || one["source"] != two["source"]){
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return false;
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}
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/// \todo Change this to use capabilities["inputs"] and only compare required/optional parameters.
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/// \todo Maybe change this to check for correct source and/or required parameters.
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//temporary: compare the two JSON::Value objects.
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return one==two;
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//nothing different? return true by default
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//return true;
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}
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///\brief Checks the validity of a stream, updates internal stream status.
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///\param name The name of the stream
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///\param data The corresponding configuration values.
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void checkStream(std::string name, JSON::Value & data){
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std::string prevState = data["error"].asStringRef();
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data["online"] = (std::string)"Checking...";
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data.removeMember("error");
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std::string URL;
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if (data.isMember("channel") && data["channel"].isMember("URL")){
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URL = data["channel"]["URL"].asString();
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}
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if (data.isMember("source")){
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URL = data["source"].asString();
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}
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if (URL == ""){
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data["error"] = "Stream offline: Missing source parameter!";
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if (data["error"].asStringRef() != prevState){
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Log("STRM", "Error for stream " + name + "! Source parameter missing.");
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}
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return;
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}
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if (URL.substr(0, 1) != "/"){
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//push-style stream
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return;
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}
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if (URL.substr(0, 1) == "/"){
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//vod-style stream
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data.removeMember("error");
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struct stat fileinfo;
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if (stat(URL.c_str(), &fileinfo) != 0){
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data["error"] = "Stream offline: Not found: " + URL;
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if (data["error"].asStringRef() != prevState){
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Log("BUFF", "Warning for VoD stream " + name + "! File not found: " + URL);
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}
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data["online"] = 0;
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return;
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}
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if (!hasViewers(name)){
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if ( !data.isMember("error")){
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data["error"] = "Available";
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}
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data["online"] = 2;
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}else{
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data["online"] = 1;
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}
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checkServerLimits(); /*LTS*/
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return;
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}
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//not recognized
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data["error"] = "Invalid source format";
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if (data["error"].asStringRef() != prevState){
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Log("STRM", "Invalid source format for stream " + name + "!");
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}
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return;
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}
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///\brief Checks all streams, restoring if needed.
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///\param data The stream configuration for the server.
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///\returns True if the server status changed
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bool CheckAllStreams(JSON::Value & data){
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long long int currTime = Util::epoch();
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for (JSON::ObjIter jit = data.ObjBegin(); jit != data.ObjEnd(); jit++){
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checkStream(jit->first, jit->second);
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if (!jit->second.isMember("name")){
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jit->second["name"] = jit->first;
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}
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if (!hasViewers(jit->first)){
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if (jit->second.isMember("source") && jit->second["source"].asString().substr(0, 1) == "/" && jit->second.isMember("error")
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&& jit->second["error"].asString().substr(0,15) != "Stream offline:"){
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jit->second["online"] = 2;
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}else{
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if (jit->second.isMember("error") && jit->second["error"].asString() == "Available"){
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jit->second.removeMember("error");
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}
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jit->second["online"] = 0;
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}
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checkServerLimits(); /*LTS*/
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}else{
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// assume all is fine
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jit->second.removeMember("error");
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jit->second["online"] = 1;
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}
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}
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//check for changes in config or streams
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static JSON::Value strlist;
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if (strlist["config"] != Storage["config"] || strlist["streams"] != Storage["streams"]){
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strlist["config"] = Storage["config"];
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strlist["streams"] = Storage["streams"];
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return true;
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}
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return false;
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}
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void AddStreams(JSON::Value & in, JSON::Value & out){
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//check for new streams and updates
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for (JSON::ObjIter jit = in.ObjBegin(); jit != in.ObjEnd(); jit++){
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if (out.isMember(jit->first)){
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if ( !streamsEqual(jit->second, out[jit->first])){
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out[jit->first] = jit->second;
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out[jit->first]["name"] = jit->first;
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Log("STRM", std::string("Updated stream ") + jit->first);
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}
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}else{
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out[jit->first] = jit->second;
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out[jit->first]["name"] = jit->first;
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Log("STRM", std::string("New stream ") + jit->first);
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}
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}
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}
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///\brief Parse a given stream configuration.
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///\param in The requested configuration.
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///\param out The new configuration after parsing.
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///
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/// \api
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/// `"streams"` requests take the form of:
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/// ~~~~~~~~~~~~~~~{.js}
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/// {
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/// "streamname_here": { //name of the stream
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/// "source": "/mnt/media/a.dtsc" //full path to a VoD file, or "push://" followed by the IP or hostname of the machine allowed to push live data. Empty means everyone is allowed to push live data.
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/// "DVR": 30000 //optional. For live streams, indicates the requested minimum size of the available DVR buffer in milliseconds.
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/// },
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/// //the above structure repeated for all configured streams
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/// }
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/// ~~~~~~~~~~~~~~~
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/// and are responded to as:
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/// ~~~~~~~~~~~~~~~{.js}
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/// {
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/// "streamname_here": { //name of the configured stream
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/// "error": "Available", //error state, if any. "Available" is a special value for VoD streams, indicating it has no current viewers (is not active), but is available for activation.
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/// "h_meta": 1398113185, //unix time the stream header (if any) was last processed for metadata
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/// "l_meta": 1398115447, //unix time the stream itself was last processed for metadata
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/// "meta": { //available metadata for this stream, if any
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/// "format": "dtsc", //detected media source format
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/// "tracks": { //list of tracks in this stream
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/// "audio_AAC_2ch_48000hz_2": {//human-readable track name
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/// "bps": 16043,
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/// "channels": 2,
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/// "codec": "AAC",
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/// "firstms": 0,
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/// "init": "\u0011Vå\u0000",
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/// "lastms": 596480,
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/// "rate": 48000,
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/// "size": 16,
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/// "trackid": 2,
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/// "type": "audio"
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/// },
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/// //the above structure repeated for all tracks
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/// },
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/// "vod": 1 //indicates VoD stream, or "live" to indicated live stream.
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/// },
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/// "name": "a", //the stream name, guaranteed to be equal to the object name.
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/// "online": 2, //online state. 0 = error, 1 = active, 2 = inactive.
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/// "source": "/home/thulinma/a.dtsc" //source for this stream, as configured.
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/// },
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/// //the above structure repeated for all configured streams
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/// }
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/// ~~~~~~~~~~~~~~~
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/// Through this request, ALL streams must always be configured. To remove a stream, simply leave it out of the request. To add a stream, simply add it to the request. To edit a stream, simply edit it in the request. The LTS edition has additional requests that allow per-stream changing of the configuration.
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void CheckStreams(JSON::Value & in, JSON::Value & out){
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//check for new streams and updates
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AddStreams(in, out);
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//check for deleted streams
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std::set<std::string> toDelete;
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for (JSON::ObjIter jit = out.ObjBegin(); jit != out.ObjEnd(); jit++){
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if ( !in.isMember(jit->first)){
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toDelete.insert(jit->first);
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Log("STRM", std::string("Deleted stream ") + jit->first);
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}
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}
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//actually delete the streams
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while (toDelete.size() > 0){
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std::string deleting = *(toDelete.begin());
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out.removeMember(deleting);
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toDelete.erase(deleting);
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}
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//update old-style configurations to new-style
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for (JSON::ObjIter jit = in.ObjBegin(); jit != in.ObjEnd(); jit++){
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if (jit->second.isMember("channel")){
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if ( !jit->second.isMember("source")){
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jit->second["source"] = jit->second["channel"]["URL"];
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}
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jit->second.removeMember("channel");
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}
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if (jit->second.isMember("preset")){
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jit->second.removeMember("preset");
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}
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}
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}
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} //Controller namespace
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