Rtmp AAC基本格式（轉）

第一個audio data包：AAC sequence header

 

第二個audio data包：AAC raw

AF表示的含義：

1）第一個字節af，a就是10代表的意思是AAC，

Format of SoundData. The following values are defined:

0 = Linear PCM, platform endian

1 = ADPCM

2 = MP3

3 = Linear PCM, little endian

4 = Nellymoser 16 kHz mono

5 = Nellymoser 8 kHz mono

6 = Nellymoser

7 = G.711 A-law logarithmic PCM

8 = G.711 mu-law logarithmic PCM

9 = reserved

10 = AAC

11 = Speex

14 = MP3 8 kHz

15 = Device-specific sound

Formats 7, 8, 14, and 15 are reserved.

AAC is supported in Flash Player 9,0,115,0 and higher.

Speex is supported in Flash Player 10 and higher.

2）第一個字節中的后四位f代表如下

前2個bit的含義采樣頻率，這里是二進制11，代表44kHZ

Sampling rate. The following values are defined:

0 = 5.5 kHz

1 = 11 kHz

2 = 22 kHz

3 = 44 kHz

第3個bit，代表 音頻用16位的

Size of each audio sample. This parameter only pertains to

uncompressed formats. Compressed formats always decode

to 16 bits internally.

0 = 8-bit samples

1 = 16-bit samples

第4個bit代表聲道

Mono or stereo sound

0 = Mono sound

1 = Stereo sound

 

3）第2個字節
AACPacketType，這個字段來表示AACAUDIODATA的類型：0 = AAC sequence header，1 = AAC raw。第一個音頻包用0，后面的都用1

當 AAC sequence header為0的碼流結構參見“ISO-14496-3 Audio”中描述。

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