FLAC support:

- FLAC container input and output support
- FLAC container analyser
- FLAC codec support in EBML input and output

src/output/meson.build

@@ -6,6 +6,7 @@ outputs = [
     {'name' : 'HTTPMinimalServer', 'format' : 'http_minimalserver', 'extra': ['http']},
     {'name' : 'MP4',               'format' : 'mp4',                'extra': ['http']},
     {'name' : 'AAC',               'format' : 'aac',                'extra': ['http']},
+    {'name' : 'FLAC',              'format' : 'flac',               'extra': ['http']},
     {'name' : 'MP3',               'format' : 'mp3',                'extra': ['http']},
     {'name' : 'H264',              'format' : 'h264',               'extra': ['http']},
     {'name' : 'HDS',               'format' : 'hds',                'extra': ['http']},

src/output/output_ebml.cpp

@@ -67,6 +67,7 @@ namespace Mist{
     capa["codecs"][0u][0u].append("MPEG2");
     capa["codecs"][0u][0u].append("AV1");
     capa["codecs"][0u][1u].append("AAC");
+    capa["codecs"][0u][1u].append("FLAC");
     capa["codecs"][0u][1u].append("vorbis");
     capa["codecs"][0u][1u].append("opus");
     capa["codecs"][0u][1u].append("PCM");
@@ -194,6 +195,7 @@ namespace Mist{
     if (codec == "PCM"){return "A_PCM/INT/BIG";}
     if (codec == "MP2"){return "A_MPEG/L2";}
     if (codec == "MP3"){return "A_MPEG/L3";}
+    if (codec == "FLAC"){return "A_FLAC";}
     if (codec == "AC3"){return "A_AC3";}
     if (codec == "ALAW"){return "A_MS/ACM";}
     if (codec == "ULAW"){return "A_MS/ACM";}

src/output/output_flac.cpp

@@ -0,0 +1,50 @@
+#include "output_flac.h"
+
+namespace Mist{
+
+  OutFLAC::OutFLAC(Socket::Connection &conn) : HTTPOutput(conn){}
+
+  void OutFLAC::init(Util::Config *cfg){
+    HTTPOutput::init(cfg);
+    capa["name"] = "FLAC";
+    capa["friendly"] = "Free Lossless Audio Codec";
+    capa["desc"] = "Pseudostreaming in FLAC format over HTTP";
+    capa["url_rel"] = "/$.flac";
+    capa["url_match"] = "/$.flac";
+    capa["codecs"][0u][0u].append("FLAC");
+    capa["methods"][0u]["handler"] = "http";
+    capa["methods"][0u]["type"] = "html5/audio/flac";
+    capa["methods"][0u]["hrn"] = "FLAC progressive";
+    capa["methods"][0u]["priority"] = 8;
+
+    JSON::Value opt;
+    opt["arg"] = "string";
+    opt["default"] = "";
+    opt["arg_num"] = 1;
+    opt["help"] = "Target filename to store FLAC file as, or - for stdout.";
+    cfg->addOption("target", opt);
+  }
+
+  void OutFLAC::sendNext(){
+    char *dataPointer = 0;
+    size_t len = 0;
+    thisPacket.getString("data", dataPointer, len);
+    myConn.SendNow(dataPointer, len);
+  }
+
+  void OutFLAC::sendHeader(){
+    myConn.SendNow(M.getInit(M.mainTrack()));
+    sentHeader = true;
+  }
+
+  void OutFLAC::respondHTTP(const HTTP::Parser &req, bool headersOnly){
+    // Set global defaults
+    HTTPOutput::respondHTTP(req, headersOnly);
+
+    H.StartResponse("200", "OK", req, myConn);
+    if (headersOnly){return;}
+    parseData = true;
+    wantRequest = false;
+  }
+
+}// namespace Mist

src/output/output_flac.h

@@ -0,0 +1,17 @@
+#include "output_http.h"
+
+namespace Mist{
+  class OutFLAC : public HTTPOutput{
+  public:
+    OutFLAC(Socket::Connection &conn);
+    static void init(Util::Config *cfg);
+    virtual void respondHTTP(const HTTP::Parser &req, bool headersOnly);
+    void sendNext();
+    void sendHeader();
+
+  private:
+    bool isFileTarget(){return isRecording();}
+  };
+}// namespace Mist
+
+typedef Mist::OutFLAC mistOut;