93 lines
1.9 KiB
Go
93 lines
1.9 KiB
Go
|
// Package fmtp implements per codec parsing of fmtp lines
|
||
|
|
package fmtp
|
||
|
|
|
||
|
|
import (
|
||
|
|
"strings"
|
||
|
|
)
|
||
|
|
|
||
|
|
// FMTP interface for implementing custom
|
||
|
|
// FMTP parsers based on MimeType
|
||
|
|
type FMTP interface {
|
||
|
|
// MimeType returns the MimeType associated with
|
||
|
|
// the fmtp
|
||
|
|
MimeType() string
|
||
|
|
// Match compares two fmtp descriptions for
|
||
|
|
// compatibility based on the MimeType
|
||
|
|
Match(f FMTP) bool
|
||
|
|
// Parameter returns a value for the associated key
|
||
|
|
// if contained in the parsed fmtp string
|
||
|
|
Parameter(key string) (string, bool)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Parse parses an fmtp string based on the MimeType
|
||
|
|
func Parse(mimetype, line string) FMTP {
|
||
|
|
var f FMTP
|
||
|
|
|
||
|
|
parameters := make(map[string]string)
|
||
|
|
|
||
|
|
for _, p := range strings.Split(line, ";") {
|
||
|
|
pp := strings.SplitN(strings.TrimSpace(p), "=", 2)
|
||
|
|
key := strings.ToLower(pp[0])
|
||
|
|
var value string
|
||
|
|
if len(pp) > 1 {
|
||
|
|
value = pp[1]
|
||
|
|
}
|
||
|
|
parameters[key] = value
|
||
|
|
}
|
||
|
|
|
||
|
|
switch {
|
||
|
|
case strings.EqualFold(mimetype, "video/h264"):
|
||
|
|
f = &h264FMTP{
|
||
|
|
parameters: parameters,
|
||
|
|
}
|
||
|
|
default:
|
||
|
|
f = &genericFMTP{
|
||
|
|
mimeType: mimetype,
|
||
|
|
parameters: parameters,
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return f
|
||
|
|
}
|
||
|
|
|
||
|
|
type genericFMTP struct {
|
||
|
|
mimeType string
|
||
|
|
parameters map[string]string
|
||
|
|
}
|
||
|
|
|
||
|
|
func (g *genericFMTP) MimeType() string {
|
||
|
|
return g.mimeType
|
||
|
|
}
|
||
|
|
|
||
|
|
// Match returns true if g and b are compatible fmtp descriptions
|
||
|
|
// The generic implementation is used for MimeTypes that are not defined
|
||
|
|
func (g *genericFMTP) Match(b FMTP) bool {
|
||
|
|
c, ok := b.(*genericFMTP)
|
||
|
|
if !ok {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
|
||
|
|
if g.mimeType != c.MimeType() {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
|
||
|
|
for k, v := range g.parameters {
|
||
|
|
if vb, ok := c.parameters[k]; ok && !strings.EqualFold(vb, v) {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
for k, v := range c.parameters {
|
||
|
|
if va, ok := g.parameters[k]; ok && !strings.EqualFold(va, v) {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
|
||
|
|
func (g *genericFMTP) Parameter(key string) (string, bool) {
|
||
|
|
v, ok := g.parameters[key]
|
||
|
|
return v, ok
|
||
|
|
}
|