Current broadcaster details admin api (#206)

* Add support for ending the inbound stream. Closes #191

* Add a simple success response to API requests

* Store inbound broadcast details for admin purposes

* Add /api/admin/broadcaster endpoint

* Reset broadcaster on disconnect

* Move controller to admin directory

core/rtmp/utils.go

@@ -0,0 +1,64 @@
+package rtmp
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"regexp"
+
+	"github.com/gabek/owncast/models"
+	"github.com/nareix/joy5/format/flv/flvio"
+)
+
+func getInboundDetailsFromMetadata(metadata []interface{}) (models.RTMPStreamMetadata, error) {
+	metadataComponentsString := fmt.Sprintf("%+v", metadata)
+	re := regexp.MustCompile(`\{(.*?)\}`)
+	submatchall := re.FindAllString(metadataComponentsString, 1)
+
+	if len(submatchall) == 0 {
+		return models.RTMPStreamMetadata{}, errors.New("unable to parse inbound metadata")
+	}
+
+	metadataJSONString := submatchall[0]
+	var details models.RTMPStreamMetadata
+	json.Unmarshal([]byte(metadataJSONString), &details)
+	return details, nil
+}
+
+func getAudioCodec(codec interface{}) string {
+	var codecID float64
+	if assertedCodecID, ok := codec.(float64); ok {
+		codecID = assertedCodecID
+	} else {
+		return codec.(string)
+	}
+
+	switch codecID {
+	case flvio.SOUND_MP3:
+		return "MP3"
+	case flvio.SOUND_AAC:
+		return "AAC"
+	case flvio.SOUND_SPEEX:
+		return "Speex"
+	}
+
+	return "Unknown"
+}
+
+func getVideoCodec(codec interface{}) string {
+	var codecID float64
+	if assertedCodecID, ok := codec.(float64); ok {
+		codecID = assertedCodecID
+	} else {
+		return codec.(string)
+	}
+
+	switch codecID {
+	case flvio.VIDEO_H264:
+		return "H.264"
+	case flvio.VIDEO_H265:
+		return "H.265"
+	}
+
+	return "Unknown"
+}