mirror of
https://github.com/aler9/gortsplib
synced 2025-10-31 18:42:40 +08:00
344 lines
7.6 KiB
Go
344 lines
7.6 KiB
Go
package format
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import (
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"encoding/hex"
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"fmt"
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"strconv"
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"strings"
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"github.com/bluenviron/mediacommon/pkg/codecs/mpeg4audio"
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"github.com/pion/rtp"
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"github.com/bluenviron/gortsplib/v4/pkg/format/rtpmpeg4audio"
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)
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// MPEG4Audio is the RTP format for a MPEG-4 Audio codec.
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// Specification: https://datatracker.ietf.org/doc/html/rfc3640
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// Specification: https://datatracker.ietf.org/doc/html/rfc6416#section-7.3
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type MPEG4Audio struct {
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// payload type of packets.
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PayloadTyp uint8
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// use LATM format (RFC6416) instead of generic format (RFC3640).
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LATM bool
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// profile level ID.
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ProfileLevelID int
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// generic only
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Config *mpeg4audio.Config
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SizeLength int
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IndexLength int
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IndexDeltaLength int
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// LATM only
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Bitrate *int
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CPresent bool
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StreamMuxConfig *mpeg4audio.StreamMuxConfig
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SBREnabled *bool
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}
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func (f *MPEG4Audio) unmarshal(ctx *unmarshalContext) error {
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f.PayloadTyp = ctx.payloadType
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f.LATM = (ctx.codec != "mpeg4-generic")
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if !f.LATM {
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for key, val := range ctx.fmtp {
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switch key {
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case "streamtype":
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if val != "5" { // AudioStream in ISO 14496-1
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return fmt.Errorf("streamtype of AAC must be 5")
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}
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case "mode":
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if strings.ToLower(val) != "aac-hbr" {
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return fmt.Errorf("unsupported AAC mode: %v", val)
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}
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case "profile-level-id":
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tmp, err := strconv.ParseUint(val, 10, 31)
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if err != nil {
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return fmt.Errorf("invalid profile-level-id: %v", val)
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}
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f.ProfileLevelID = int(tmp)
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case "config":
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enc, err := hex.DecodeString(val)
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if err != nil {
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return fmt.Errorf("invalid AAC config: %v", val)
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}
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f.Config = &mpeg4audio.Config{}
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err = f.Config.Unmarshal(enc)
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if err != nil {
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return fmt.Errorf("invalid AAC config: %v", val)
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}
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case "sizelength":
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n, err := strconv.ParseUint(val, 10, 31)
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if err != nil || n > 100 {
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return fmt.Errorf("invalid AAC SizeLength: %v", val)
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}
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f.SizeLength = int(n)
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case "indexlength":
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n, err := strconv.ParseUint(val, 10, 31)
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if err != nil || n > 100 {
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return fmt.Errorf("invalid AAC IndexLength: %v", val)
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}
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f.IndexLength = int(n)
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case "indexdeltalength":
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n, err := strconv.ParseUint(val, 10, 31)
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if err != nil || n > 100 {
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return fmt.Errorf("invalid AAC IndexDeltaLength: %v", val)
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}
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f.IndexDeltaLength = int(n)
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}
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}
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if f.Config == nil {
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return fmt.Errorf("config is missing")
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}
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if f.SizeLength == 0 {
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return fmt.Errorf("sizelength is missing")
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}
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} else {
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// default value set by specification
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f.ProfileLevelID = 30
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f.CPresent = true
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for key, val := range ctx.fmtp {
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switch key {
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case "profile-level-id":
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tmp, err := strconv.ParseUint(val, 10, 31)
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if err != nil {
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return fmt.Errorf("invalid profile-level-id: %v", val)
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}
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f.ProfileLevelID = int(tmp)
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case "bitrate":
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tmp, err := strconv.ParseUint(val, 10, 31)
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if err != nil {
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return fmt.Errorf("invalid bitrate: %v", val)
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}
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v := int(tmp)
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f.Bitrate = &v
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case "cpresent":
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f.CPresent = (val == "1")
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case "config":
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enc, err := hex.DecodeString(val)
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if err != nil {
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return fmt.Errorf("invalid AAC config: %v", val)
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}
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f.StreamMuxConfig = &mpeg4audio.StreamMuxConfig{}
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err = f.StreamMuxConfig.Unmarshal(enc)
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if err != nil {
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return fmt.Errorf("invalid AAC config: %w", err)
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}
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case "sbr-enabled":
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v := (val == "1")
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f.SBREnabled = &v
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}
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}
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if f.CPresent {
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if f.StreamMuxConfig != nil {
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return fmt.Errorf("config and cpresent can't be used at the same time")
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}
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} else {
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if f.StreamMuxConfig == nil {
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return fmt.Errorf("config is missing")
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}
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}
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}
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return nil
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}
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// Codec implements Format.
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func (f *MPEG4Audio) Codec() string {
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return "MPEG-4 Audio"
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}
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// ClockRate implements Format.
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func (f *MPEG4Audio) ClockRate() int {
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if !f.LATM {
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return f.Config.SampleRate
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}
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if f.CPresent {
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return 16000
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}
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return f.StreamMuxConfig.Programs[0].Layers[0].AudioSpecificConfig.SampleRate
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}
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// PayloadType implements Format.
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func (f *MPEG4Audio) PayloadType() uint8 {
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return f.PayloadTyp
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}
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// RTPMap implements Format.
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func (f *MPEG4Audio) RTPMap() string {
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if !f.LATM {
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sampleRate := f.Config.SampleRate
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if f.Config.ExtensionSampleRate != 0 {
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sampleRate = f.Config.ExtensionSampleRate
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}
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channelCount := f.Config.ChannelCount
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if f.Config.ExtensionType == mpeg4audio.ObjectTypePS {
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channelCount = 2
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}
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return "mpeg4-generic/" + strconv.FormatInt(int64(sampleRate), 10) +
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"/" + strconv.FormatInt(int64(channelCount), 10)
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}
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if f.CPresent {
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return "MP4A-LATM/16000/1"
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}
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aoc := f.StreamMuxConfig.Programs[0].Layers[0].AudioSpecificConfig
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sampleRate := aoc.SampleRate
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if aoc.ExtensionSampleRate != 0 {
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sampleRate = aoc.ExtensionSampleRate
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}
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channelCount := aoc.ChannelCount
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if aoc.ExtensionType == mpeg4audio.ObjectTypePS {
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channelCount = 2
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}
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return "MP4A-LATM/" + strconv.FormatInt(int64(sampleRate), 10) +
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"/" + strconv.FormatInt(int64(channelCount), 10)
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}
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// FMTP implements Format.
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func (f *MPEG4Audio) FMTP() map[string]string {
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if !f.LATM {
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enc, err := f.Config.Marshal()
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if err != nil {
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return nil
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}
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profileLevelID := f.ProfileLevelID
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if profileLevelID == 0 { // support legacy definition which didn't include profile-level-id
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profileLevelID = 1
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}
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fmtp := map[string]string{
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"streamtype": "5",
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"mode": "AAC-hbr",
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"profile-level-id": strconv.FormatInt(int64(profileLevelID), 10),
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}
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if f.SizeLength > 0 {
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fmtp["sizelength"] = strconv.FormatInt(int64(f.SizeLength), 10)
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}
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if f.IndexLength > 0 {
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fmtp["indexlength"] = strconv.FormatInt(int64(f.IndexLength), 10)
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}
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if f.IndexDeltaLength > 0 {
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fmtp["indexdeltalength"] = strconv.FormatInt(int64(f.IndexDeltaLength), 10)
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}
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fmtp["config"] = hex.EncodeToString(enc)
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return fmtp
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}
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fmtp := map[string]string{
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"profile-level-id": strconv.FormatInt(int64(f.ProfileLevelID), 10),
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}
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if f.Bitrate != nil {
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fmtp["bitrate"] = strconv.FormatInt(int64(*f.Bitrate), 10)
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}
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if f.CPresent {
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fmtp["cpresent"] = "1"
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} else {
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fmtp["cpresent"] = "0"
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enc, err := f.StreamMuxConfig.Marshal()
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if err != nil {
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return nil
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}
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fmtp["config"] = hex.EncodeToString(enc)
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fmtp["object"] = strconv.FormatInt(int64(f.StreamMuxConfig.Programs[0].Layers[0].AudioSpecificConfig.Type), 10)
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}
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if f.SBREnabled != nil {
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if *f.SBREnabled {
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fmtp["SBR-enabled"] = "1"
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} else {
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fmtp["SBR-enabled"] = "0"
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}
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}
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return fmtp
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}
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// PTSEqualsDTS implements Format.
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func (f *MPEG4Audio) PTSEqualsDTS(*rtp.Packet) bool {
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return true
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}
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// CreateDecoder creates a decoder able to decode the content of the format.
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func (f *MPEG4Audio) CreateDecoder() (*rtpmpeg4audio.Decoder, error) {
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d := &rtpmpeg4audio.Decoder{
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LATM: f.LATM,
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SizeLength: f.SizeLength,
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IndexLength: f.IndexLength,
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IndexDeltaLength: f.IndexDeltaLength,
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}
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err := d.Init()
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if err != nil {
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return nil, err
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}
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return d, nil
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}
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// CreateEncoder creates an encoder able to encode the content of the format.
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func (f *MPEG4Audio) CreateEncoder() (*rtpmpeg4audio.Encoder, error) {
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e := &rtpmpeg4audio.Encoder{
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LATM: f.LATM,
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PayloadType: f.PayloadTyp,
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SizeLength: f.SizeLength,
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IndexLength: f.IndexLength,
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IndexDeltaLength: f.IndexDeltaLength,
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}
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err := e.Init()
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if err != nil {
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return nil, err
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}
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return e, nil
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}
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// GetConfig returns the MPEG-4 Audio configuration.
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func (f *MPEG4Audio) GetConfig() *mpeg4audio.Config {
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if !f.LATM {
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return f.Config
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}
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if f.CPresent {
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return nil
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}
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return f.StreamMuxConfig.Programs[0].Layers[0].AudioSpecificConfig
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}
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