Analysis of AAC-LC code stream in dvsdk (3): raw_data_block ()

 

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After a 7-byte frame header, It is the encoded data, as described in the standard:

In the first three frames of data, the first id_syn_ele value is type_sce. Besides the first frame with two IDs, each frame has only one ID.

Go down to single_channel_element ()

The read tag value is 0.

Next, describe individual_channel_stream.

Global_gain indicates the quantization level. This value is different in each frame.

Because TNS is disabled in the encoder, the following pulse_data and tns_data flags are both 0, that is, this part of data does not exist.

Gain_control_data_present is also 0.