Apple

On Wed, May 3, 2017 at 2:26 AM Makoto Hiroi <email@hidden> wrote:

Hi,

Does anyone know that iPhone can send an AAC music file as AAC data over Bluetooth without re-encoding it?

We are developing Bluetooth receiver products.

We would like to explain that AAC codec is better than SBC because AAC music files are not necessary to be decoded and re-encoded before sending, then they will be decoded once in a Bluetooth receiver. But one of our customers pointed it is wrong.

He says that all sounds created by iPhone are mixed before sending them to Bluetooth stack. To mix those sounds, AAC files must be decoded to PCM once, and mixed sounds are re-encoding to AAC data.

I have read Apple Accessory Bluetooth Design Guidelines.
https://developer.apple.com/hardwaredrivers/BluetoothDesignGuidelines.pdf

iOS device seems to have an A2DP channel for playing music contents separately from the system sounds and HFP.
But I am not confident that iPhone sends AAC files without re-encoding.

Thanks,
Hiroi

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References:
	>Re: sending AAC music file over bluetooth (From: Ahmad Rahmati <email@hidden>)