? meaning of entries in "ALAC (96 AppleLossless, 96 352 0 16 40 10 14 2 255 0 0 44100)"

[fduncanh]

0x40000: ALAC (96 AppleLossless, 96 352 0 16 40 10 14 2 255 0 0 44100)

I'm trying to make a GStreamer pipeline for playing decrypted ALAC format audio received by by a linux-based AirPlay server http://github.com/FDH2/UxPlay that currently only does AAC_ELD audio.

I guess I know what the 96 and 44100 mean; do you have any idea what the other entries (352.... ) above mean?

[SteeBono]

The ALAC codec stores specific information about the encoded stream in the ALACSpecificConfig. This info is vended by the encoder and is used to setup the decoder for a given encoded bitstream.

Also know as magic cookie.

ALAC (96 AppleLossless, 96 352 0 16 40 10 14 2 255 0 0 44100)

• Max sample per frame: 352 -> frame length, indicating the frames per packet when no explicit frames per packet setting is present in the packet header
• Tag version: 0 -> compatible version
• Sample size: 16 -> describes the bit depth of the source PCM data (maximum value 32)
• History mult: 40 -> I dont know but value should be set to 40
• Initial history: 10 -> I dont know but value should be set to 10
• Rice param limit: 14 -> I dont know but value should be set to 14
• Number of channels: 2 -> describes the channel count
• Max run: 255 -> I dont know but value should be set to 255
• Max coded frame size: 0 -> the maximum size of an Apple Lossless packet within the encoded stream (0 means unknown)
• Average bitrate: 0 -> the average bit rate in bits per second of the Apple Lossless stream (0 means unknown)
• Sample rate: 44100 -> sample rate of the encoded stream

Hope this help you.