forked from Comcast/gots
/
pmtelementarystream.go
95 lines (81 loc) · 2.96 KB
/
pmtelementarystream.go
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/*
MIT License
Copyright 2016 Comcast Cable Communications Management, LLC
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
package psi
import (
"bytes"
"fmt"
)
// PmtElementaryStream represents an elementary stream inside a PMT
type PmtElementaryStream interface {
PmtStreamType
ElementaryPid() uint16
Descriptors() []PmtDescriptor
MaxBitRate() uint64
}
type pmtElementaryStream struct {
PmtStreamType
elementaryPid uint16
descriptors []PmtDescriptor
}
const (
// BitsPerByte is the number of bits in a byte
BitsPerByte = 8
// MaxBitRateBytesPerSecond is the maximum bit rate per second in a profile
MaxBitRateBytesPerSecond = 50
)
// NewPmtElementaryStream creates a new PmtElementaryStream.
func NewPmtElementaryStream(streamType uint8, elementaryPid uint16, descriptors []PmtDescriptor) PmtElementaryStream {
es := &pmtElementaryStream{}
es.PmtStreamType = LookupPmtStreamType(streamType)
es.elementaryPid = elementaryPid
es.descriptors = descriptors
return es
}
func (es *pmtElementaryStream) ElementaryPid() uint16 {
return es.elementaryPid
}
func (es *pmtElementaryStream) Descriptors() []PmtDescriptor {
return es.descriptors
}
// MaxBitRate returns the value of the PmtElementaryStreams maximum bitrate in bits-per-second.
// See Section 2.6.27 of ISO-13818 for more information.
func (es *pmtElementaryStream) MaxBitRate() uint64 {
for _, desc := range es.descriptors {
if desc.IsMaximumBitrateDescriptor() {
return uint64(desc.DecodeMaximumBitRate()) * BitsPerByte * MaxBitRateBytesPerSecond
}
}
return 0
}
func (es *pmtElementaryStream) String() string {
descriptors := es.descriptors
var descriptorsBuf bytes.Buffer
if len(descriptors) > 0 {
descriptorsBuf.WriteString(",")
for i, descriptor := range descriptors {
descriptorsBuf.WriteString(fmt.Sprintf("descriptor%d='%v'", i, descriptor))
i++
if i < len(descriptors) {
descriptorsBuf.WriteString(",")
}
}
}
return fmt.Sprintf("ElementaryStream[pid=%d,%v%s]", es.elementaryPid, es.PmtStreamType, descriptorsBuf.String())
}