Documentation
¶
Index ¶
- Constants
- Variables
- func MakeAscWithAdtsHeader(adtsHeader []byte) (asc []byte, err error)
- func MakeAudioDataSeqHeaderWithAdtsHeader(adtsHeader []byte) (out []byte, err error)
- func MakeAudioDataSeqHeaderWithAsc(asc []byte) (out []byte, err error)
- type AdtsHeaderContext
- type AscContext
- func (ascCtx *AscContext) GetSamplingFrequency() (int, error)
- func (ascCtx *AscContext) Pack() (asc []byte)
- func (ascCtx *AscContext) PackAdtsHeader(frameLength int) (out []byte)
- func (ascCtx *AscContext) PackToAdtsHeader(out []byte, frameLength int) error
- func (ascCtx *AscContext) Unpack(asc []byte) error
- type SequenceHeaderContext
Constants ¶
const ( AdtsHeaderLength = 7 AscSamplingFrequencyIndex96000 = 0 AscSamplingFrequencyIndex88200 = 1 AscSamplingFrequencyIndex64000 = 2 AscSamplingFrequencyIndex48000 = 3 AscSamplingFrequencyIndex44100 = 4 AscSamplingFrequencyIndex32000 = 5 AscSamplingFrequencyIndex24000 = 6 AscSamplingFrequencyIndex22050 = 7 AscSamplingFrequencyIndex16000 = 8 AscSamplingFrequencyIndex12000 = 9 AscSamplingFrequencyIndex11025 = 10 AscSamplingFrequencyIndex8000 = 11 AscSamplingFrequencyIndex7350 = 12 )
Variables ¶
var ErrSamplingFrequencyIndex = errors.New("err sampling frequency index")
var ErrShortBuffer = errors.New("err short buffer")
Functions ¶
func MakeAscWithAdtsHeader ¶
MakeAscWithAdtsHeader *****************************************************
- @Description:
- @param adtsHeader 函数调用结束后，内部不持有该内存块
- @return asc 内存块为独立新申请；函数调用结束后，内部不持有该内存块
- @return err *****************************************************
func MakeAudioDataSeqHeaderWithAdtsHeader ¶
MakeAudioDataSeqHeaderWithAdtsHeader *****************************************************
- @Description:
- @param adtsHeader 函数调用结束后，内部不持有该内存块
- @return out 内存块为独立新申请；函数调用结束后，内部不持有该内存块
- @return err *****************************************************
func MakeAudioDataSeqHeaderWithAsc ¶
MakeAudioDataSeqHeaderWithAsc *****************************************************
- @Description:
- @param asc 函数调用结束后，内部不持有该内存块
- @return out 内存块为独立新申请；函数调用结束后，内部不持有该内存块
- @return err *****************************************************
Types ¶
type AdtsHeaderContext ¶
type AdtsHeaderContext struct {
AscCtx AscContext
AdtsLength uint16 // 字段中的值，包含了adts header + adts frame
}
func NewAdtsHeaderContext ¶
func NewAdtsHeaderContext(adtsHeader []byte) (*AdtsHeaderContext, error)
func (*AdtsHeaderContext) Unpack ¶
func (ctx *AdtsHeaderContext) Unpack(adtsHeader []byte) error
Unpack *****************************************************
- @Description:
- @receiver ctx
- @param adtsHeader 函数调用结束后，内部不持有该内存块
- @return error *****************************************************
type AscContext ¶
type AscContext struct {
AudioObjectType uint8 // [5b]
SamplingFrequencyIndex uint8 // [4b]
ChannelConfiguration uint8 // [4b]
}
AscContext
<ISO_IEC_14496-3.pdf> <1.6.2.1 AudioSpecificConfig>, <page 33/110> <1.5.1.1 Audio Object type definition>, <page 23/110> <1.6.3.3 samplingFrequencyIndex>, <page 35/110> <1.6.3.4 channelConfiguration> -------------------------------------------------------- audio object type [5b] 1=AAC MAIN 2=AAC LC samplingFrequencyIndex [4b] 0=96000, 1=88200, 2=64000, 3=48000, 4=44100, 5=32000, 6=24000, 7=22050, 8=16000, 9=12000, 10=11025, 11=11025, 12=7350 channelConfiguration [4b] 1=center front speaker 2=left, right front speakers
func NewAscContext ¶
func NewAscContext(asc []byte) (*AscContext, error)
func (*AscContext) GetSamplingFrequency ¶
func (ascCtx *AscContext) GetSamplingFrequency() (int, error)
func (*AscContext) Pack ¶
func (ascCtx *AscContext) Pack() (asc []byte)
Pack *****************************************************
- @Description:
- @receiver ascCtx
- @return asc 内存块为独立新申请；函数调用结束后，内部不持有该内存块 *****************************************************
func (*AscContext) PackAdtsHeader ¶
func (ascCtx *AscContext) PackAdtsHeader(frameLength int) (out []byte)
PackAdtsHeader *****************************************************
- @Description: 获取ADTS头，由于ADTS头中的字段依赖包的长度，而每个包的长度可能不同，所以每个包的ADTS头都需要独立生成
- @receiver ascCtx
- @param frameLength raw aac frame的大小 如果是rtmp/flv的message/tag，应去除Seq Header头部的2个字节
- @return out 内存块为独立新申请；函数调用结束后，内部不持有该内存块 *****************************************************
func (*AscContext) PackToAdtsHeader ¶
func (ascCtx *AscContext) PackToAdtsHeader(out []byte, frameLength int) error
PackToAdtsHeader *****************************************************
- @Description:
- @receiver ascCtx
- @param out 函数调用结束后，内部不持有该内存块
- @param frameLength
- @return error *****************************************************
func (*AscContext) Unpack ¶
func (ascCtx *AscContext) Unpack(asc []byte) error
Unpack *****************************************************
- @Description: 如果是rtmp/flv的message/tag，应去除Seq Header头部的2个字节 函数调用结束后，内部不持有该内存块
- @receiver ascCtx
- @param asc 2字节的AAC Audio Specifc Config。
- @return error *****************************************************
type SequenceHeaderContext ¶
type SequenceHeaderContext struct {
SoundFormat uint8 // [4b]
SoundRate uint8 // [2b]
SoundSize uint8 // [1b]
SoundType uint8 // [1b]
AacPacketType uint8 // [8b]
}
SequenceHeaderContext
<spec-video_file_format_spec_v10.pdf>, <Audio tags, AUDIODATA>, <page 10/48> ---------------------------------------------------------------------------- soundFormat [4b] 10=AAC soundRate [2b] 3=44kHz. AAC always 3 soundSize [1b] 0=snd8Bit, 1=snd16Bit soundType [1b] 0=sndMono, 1=sndStereo. AAC always 1 aacPackageType [8b] 0=seq header, 1=AAC raw
func (*SequenceHeaderContext) Unpack ¶
func (shCtx *SequenceHeaderContext) Unpack(b []byte)
Unpack *****************************************************
- @Description: 函数调用结束后，内部不持有该内存块
- @receiver shCtx
- @param b rtmp/flv的message/tag的payload的前2个字节。 *****************************************************
Source Files