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优化HLS写入内存复用

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This commit is contained in:
dexter
2023-02-11 22:09:47 +08:00
parent dde2b00fc1
commit b24fd63354
9 changed files with 207 additions and 324 deletions
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27
codec/codec.go
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@@ -59,8 +59,8 @@ func (asc *AudioSpecificConfig) Parse(data []byte) {
asc.ExtensionFlag = data[1] & 0x01
}
func (asc *AudioSpecificConfig) ToADTS(rawDataLength int) (adts ADTS, adtsByte []byte, err error) {
return AudioSpecificConfigToADTS(asc, rawDataLength)
func (asc *AudioSpecificConfig) ToADTS(rawDataLength int, adtsByte []byte) (adts ADTS, err error) {
return AudioSpecificConfigToADTS(asc, rawDataLength, adtsByte)
}
type GASpecificConfig struct {
@@ -172,7 +172,7 @@ type ADTSVariableHeader struct {
// 所以说number_of_raw_data_blocks_in_frame == 0 表示说ADTS帧中有一个AAC数据块并不是说没有。(一个AAC原始帧包含一段时间内1024个采样及相关数据)
func AudioSpecificConfigToADTS(asc *AudioSpecificConfig, rawDataLength int) (adts ADTS, adtsByte []byte, err error) {
func AudioSpecificConfigToADTS(asc *AudioSpecificConfig, rawDataLength int, adtsByte []byte) (adts ADTS, err error) {
if asc.ChannelConfiguration > 8 || asc.FrameLengthFlag > 13 {
err = errors.New("Reserved field.")
return
@@ -185,9 +185,8 @@ func AudioSpecificConfigToADTS(asc *AudioSpecificConfig, rawDataLength int) (adt
adts.ProtectionAbsent = 1
// SyncWord(12) + ID(1) + Layer(2) + ProtectionAbsent(1)
adtsByte = append(adtsByte, 0xff)
adtsByte = append(adtsByte, 0xf1)
adtsByte[0] = 0xFF
adtsByte[1] = 0xF1
if asc.AudioObjectType >= 3 || asc.AudioObjectType == 0 {
adts.Profile = 1
} else {
@@ -201,9 +200,7 @@ func AudioSpecificConfigToADTS(asc *AudioSpecificConfig, rawDataLength int) (adt
adts.Home = 0
// Profile(2) + SamplingFrequencyIndex(4) + PrivateBit(1) + ChannelConfiguration(3)(取高1位)
byte3 := uint8(adts.Profile<<6) + uint8(adts.SamplingFrequencyIndex<<2) + uint8(adts.PrivateBit<<1) + uint8((adts.ChannelConfiguration&0x7)>>2)
adtsByte = append(adtsByte, byte3)
adtsByte[2] = uint8(adts.Profile<<6) + uint8(adts.SamplingFrequencyIndex<<2) + uint8(adts.PrivateBit<<1) + uint8((adts.ChannelConfiguration&0x7)>>2)
// ADTSVariableHeader
adts.CopyrightIdentificationBit = 0
adts.CopyrightIdentificationStart = 0
@@ -212,21 +209,17 @@ func AudioSpecificConfigToADTS(asc *AudioSpecificConfig, rawDataLength int) (adt
adts.NumberOfRawDataBlockInFrame = 0
// ChannelConfiguration(3)(取低2位) + OriginalCopy(1) + Home(1) + CopyrightIdentificationBit(1) + CopyrightIdentificationStart(1) + AACFrameLength(13)(取高2位)
byte4 := uint8((adts.ChannelConfiguration&0x3)<<6) + uint8((adts.AACFrameLength&0x1fff)>>11)
adtsByte = append(adtsByte, byte4)
adtsByte[3] = uint8((adts.ChannelConfiguration&0x3)<<6) + uint8((adts.AACFrameLength&0x1fff)>>11)
// AACFrameLength(13)
// xx xxxxxxxx xxx
// 取中间的部分
byte5 := uint8(((adts.AACFrameLength & 0x1fff) >> 3) & 0x0ff)
adtsByte = append(adtsByte, byte5)
adtsByte[4] = uint8(((adts.AACFrameLength & 0x1fff) >> 3) & 0x0ff)
// AACFrameLength(13)(取低3位) + ADTSBufferFullness(11)(取高5位)
byte6 := uint8((adts.AACFrameLength&0x0007)<<5) + 0x1f
adtsByte = append(adtsByte, byte6)
adtsByte[5] = uint8((adts.AACFrameLength&0x0007)<<5) + 0x1f
// ADTSBufferFullness(11)(取低6位) + NumberOfRawDataBlockInFrame(2)
adtsByte = append(adtsByte, 0xfc)
adtsByte[6] = 0xfc
return
}