live-streamer/config/config.go

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package config
import (
"encoding/json"
"errors"
"fmt"
"live-streamer/utils"
"log"
"os"
"path/filepath"
"strings"
)
type OutputConfig struct {
RTMPServer string `json:"rtmp_server"`
StreamKey string `json:"stream_key"`
}
type InputItem struct {
Path string `json:"path"`
Start string `json:"start"`
End string `json:"end"`
ItemType string `json:"-"`
}
type PlayConfig struct {
VideoCodec string `json:"video_codec"`
Preset string `json:"preset"`
CRF int `json:"crf"`
MaxRate string `json:"max_rate"`
BufSize string `json:"buf_size"`
Scale string `json:"scale"`
FrameRate int `json:"frame_rate"`
AudioCodec string `json:"audio_codec"`
AudioBitrate string `json:"audio_bitrate"`
AudioSampleRate int `json:"audio_sample_rate"`
OutputFormat string `json:"output_format"`
CustomArgs string `json:"custom_args"`
}
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type LogConfig struct {
PlayState bool `json:"play_state"`
}
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type ServerConfig struct {
Addr string `json:"addr"`
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Token string `json:"token"`
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}
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type Config struct {
Input []any `json:"input"`
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InputItems []InputItem `json:"-"` // contains video file or dir
VideoList []InputItem `json:"-"` // only contains video file
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Play PlayConfig `json:"play"`
Output OutputConfig `json:"output"`
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Log LogConfig `json:"log"`
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Server ServerConfig `json:"server"`
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}
var GlobalConfig Config
func init() {
GlobalConfig = Config{}
err := readConfig("config.json")
if len(GlobalConfig.Input) == 0 {
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log.Fatal("No input video found")
}
if err != nil {
if os.IsNotExist(err) {
log.Fatal("Config not exists")
} else {
log.Fatal(err)
}
}
}
func readConfig(configPath string) error {
stat, err := os.Stat(configPath)
if err != nil {
return fmt.Errorf("config read failed: %v", err)
}
if stat.IsDir() {
return os.ErrNotExist
}
databytes, err := os.ReadFile(configPath)
if err != nil {
return fmt.Errorf("Config read failed: %v", err)
}
if err = json.Unmarshal(databytes, &GlobalConfig); err != nil {
return fmt.Errorf("config unmarshal failed: %v", err)
}
err = validateConfig()
if err != nil {
return fmt.Errorf("config validate failed: %v", err)
}
return nil
}
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func validateConfig() error {
if err := validateInputConfig(); err != nil {
return err
}
if err := validateOutputConfig(); err != nil {
return err
}
if err := validatePlayConfig(); err != nil {
return err
}
if err := validateServerConfig(); err != nil {
return err
}
return nil
}
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func validateInputConfig() error {
if GlobalConfig.Input == nil {
return errors.New("video_path is nil")
}
GlobalConfig.InputItems = make([]InputItem, 0, len(GlobalConfig.Input))
GlobalConfig.VideoList = []InputItem{}
for i, item := range GlobalConfig.Input {
var inputItem InputItem
switch v := item.(type) {
case string:
inputItem = InputItem{Path: v}
case map[string]any:
data, err := json.Marshal(v)
if err != nil {
return fmt.Errorf("failed to marshal input item[%d]: %v", i, err)
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}
if err := json.Unmarshal(data, &inputItem); err != nil {
return fmt.Errorf("failed to unmarshal input item[%d]: %v", i, err)
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}
// more efficient, but coupled
// if path, ok := v["path"].(string); ok {
// inputItem.Path = path
// }
// if start, ok := v["start"].(string); ok {
// inputItem.Start = start
// }
// if end, ok := v["end"].(string); ok {
// inputItem.End = end
// }
default:
return fmt.Errorf("invalid input type for item[%d]: %T", i, item)
}
if inputItem.Path == "" {
return fmt.Errorf("video_path[%d] is empty", i)
}
stat, err := os.Stat(inputItem.Path)
if err != nil {
return fmt.Errorf("video_path[%d] stat failed: %v", i, err)
}
if stat.IsDir() {
inputItem.ItemType = "dir"
videos, err := getAllVideos(inputItem.Path)
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if err != nil {
return fmt.Errorf("video_path[%d] get videos error: %v", i, err)
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}
GlobalConfig.VideoList = append(GlobalConfig.VideoList, videos...)
} else {
inputItem.ItemType = "file"
if !utils.IsSupportedVideo(inputItem.Path) {
return fmt.Errorf("video_path[%d] is not supported", i)
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}
GlobalConfig.VideoList = append(GlobalConfig.VideoList, inputItem)
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}
GlobalConfig.InputItems = append(GlobalConfig.InputItems, inputItem)
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}
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return nil
}
func validateOutputConfig() error {
if GlobalConfig.Output.RTMPServer == "" {
return errors.New("rtmp_server is empty")
} else if !strings.HasPrefix(GlobalConfig.Output.RTMPServer, "rtmp://") &&
!strings.HasPrefix(GlobalConfig.Output.RTMPServer, "rtmps://") {
return errors.New("rtmp_server is not a valid rtmp server")
} else {
GlobalConfig.Output.RTMPServer = strings.TrimSuffix(GlobalConfig.Output.RTMPServer, "/")
}
if GlobalConfig.Output.StreamKey == "" {
return errors.New("stream_key is empty")
} else {
GlobalConfig.Output.StreamKey = strings.TrimPrefix(GlobalConfig.Output.StreamKey, "/")
}
return nil
}
func validatePlayConfig() error {
if GlobalConfig.Play.VideoCodec == "" {
GlobalConfig.Play.VideoCodec = "libx264"
}
if GlobalConfig.Play.Preset == "" {
GlobalConfig.Play.Preset = "fast"
}
if GlobalConfig.Play.CRF == 0 {
GlobalConfig.Play.CRF = 23
}
if GlobalConfig.Play.MaxRate == "" {
GlobalConfig.Play.MaxRate = "8000k"
}
if GlobalConfig.Play.BufSize == "" {
GlobalConfig.Play.BufSize = "12000k"
}
if GlobalConfig.Play.Scale == "" {
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GlobalConfig.Play.Scale = "1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2"
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}
if GlobalConfig.Play.FrameRate == 0 {
GlobalConfig.Play.FrameRate = 30
}
if GlobalConfig.Play.AudioCodec == "" {
GlobalConfig.Play.AudioCodec = "aac"
}
if GlobalConfig.Play.AudioBitrate == "" {
GlobalConfig.Play.AudioBitrate = "192k"
}
if GlobalConfig.Play.AudioSampleRate == 0 {
GlobalConfig.Play.AudioSampleRate = 48000
}
if GlobalConfig.Play.OutputFormat == "" {
GlobalConfig.Play.OutputFormat = "flv"
}
return nil
}
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func validateServerConfig() error {
if GlobalConfig.Server.Addr == "" {
GlobalConfig.Server.Addr = ":8080"
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}
return nil
}
func getAllVideos(dirPath string) ([]InputItem, error) {
res := []InputItem{}
err := filepath.Walk(dirPath, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if !info.IsDir() && utils.IsSupportedVideo(path) {
res = append(res, InputItem{Path: path})
}
return nil
})
if err != nil {
return nil, err
}
return res, nil
}