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rename funcs add MakeADTSHeader()

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This commit is contained in:
nareix 2016-04-18 00:21:26 +08:00
parent 35097b942c
commit 15a2ce0a4e
2 changed files with 41 additions and 18 deletions
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48
isom/isom.go
View File

@ -81,40 +81,56 @@ var chanConfigTable = []int{
0, 1, 2, 3, 4, 5, 6, 8,
}
func IsADTSPayload(frames []byte) bool {
func IsADTSFrame(frames []byte) bool {
return len(frames) > 7 && frames[0]==0xff&&frames[1]&0xf0==0xf0
}
func ReadADTSPayload(frames []byte) (config MPEG4AudioConfig, payload []byte, n int, next []byte, err error) {
if !IsADTSPayload(frames) {
func ReadADTSFrame(frame []byte) (config MPEG4AudioConfig, payload []byte, samples int, framelen int, err error) {
if !IsADTSFrame(frame) {
err = fmt.Errorf("not adts frame")
return
}
config.ObjectType = uint(frames[2]>>6)+1
config.SampleRateIndex = uint(frames[2]>>2&0xf)
config.ChannelConfig = uint(frames[2]<<2&0x4|frames[3]>>6&0x3)
framelen := int(frames[3]&0x3)<<11|int(frames[4])<<3|int(frames[5]>>5)
n = (int(frames[6]&0x3)+1)*1024
config.ObjectType = uint(frame[2]>>6)+1
config.SampleRateIndex = uint(frame[2]>>2&0xf)
config.ChannelConfig = uint(frame[2]<<2&0x4|frame[3]>>6&0x3)
framelen = int(frame[3]&0x3)<<11|int(frame[4])<<3|int(frame[5]>>5)
samples = (int(frame[6]&0x3)+1)*1024
hdrlen := 7
if frames[1]&0x1 == 0 {
if frame[1]&0x1 == 0 {
hdrlen = 9
}
if framelen < hdrlen || len(frames) < framelen {
if framelen < hdrlen || len(frame) < framelen {
err = fmt.Errorf("invalid adts header length")
return
}
payload = append(payload, frames[hdrlen:framelen]...)
next = frames[framelen:]
payload = frame[hdrlen:framelen]
return
}
func ExtractADTSPayload(frames []byte) (config MPEG4AudioConfig, payload []byte, total int, err error) {
func MakeADTSHeader(config MPEG4AudioConfig, samples int, payloadLength int) (header []byte) {
payloadLength += 7
//AAAAAAAA AAAABCCD EEFFFFGH HHIJKLMM MMMMMMMM MMMOOOOO OOOOOOPP (QQQQQQQQ QQQQQQQQ)
header = []byte{0xff,0xf1,0x50,0x80,0x043,0xff,0xcd}
//config.ObjectType = uint(frames[2]>>6)+1
//config.SampleRateIndex = uint(frames[2]>>2&0xf)
//config.ChannelConfig = uint(frames[2]<<2&0x4|frames[3]>>6&0x3)
header[2] = (byte(config.ObjectType-1)&0x3)<<6|(byte(config.SampleRateIndex)&0xf)<<2|byte(config.ChannelConfig>>2)&0x1
header[3] = header[3]&0x3f|byte(config.ChannelConfig&0x3)<<6
header[3] = header[3]&0xfc|byte(payloadLength>>11)&0x3
header[4] = byte(payloadLength>>3)
header[5] = header[5]&0x1f|(byte(payloadLength)&0x7)<<5
header[6] = header[6]&0xfc|byte(samples/1024-1)
return
}
func ExtractADTSFrames(frames []byte) (config MPEG4AudioConfig, payload []byte, samples int, err error) {
for len(frames) > 0 {
var n int
if config, payload, n, frames, err = ReadADTSPayload(frames); err != nil {
var n, framelen int
if config, payload, n, framelen, err = ReadADTSFrame(frames); err != nil {
return
}
total += n
frames = frames[framelen:]
samples += n
}
return
}

11
isom/isom_test.go
View File

@ -41,6 +41,13 @@ func TestReadElemStreamDesc(t *testing.T) {
//00000010 61 63 20 31 2e 32 38 00 00 42 40 93 20 04 32 00 |ac 1.28..B@. .2.|
//00000020 47 ff f1 50 80 05 1f fc 21 42 fe ed b2 5c a8 00 |G..P....!B...\..|
data, _ = hex.DecodeString("fff15080043ffcde040000")
aconfig, frameLength := ReadADTSHeader(data)
t.Logf("%v frameLength=%d", aconfig.Complete(), frameLength)
var n, framelen int
aconfig, _, n, _, _ = ReadADTSFrame(data)
t.Logf("%v n=%d", aconfig.Complete(), n)
data = MakeADTSHeader(aconfig, 1024*3, 33)
data = append(data, []byte{1,2,3,4,5}...)
t.Logf("%x", data)
aconfig, _, n, framelen, err = ReadADTSFrame(data)
t.Logf("%v n=%d framelen=%d err=%v", aconfig.Complete(), n, framelen, err)
}