SoC 2011/OMA/Atrac Improvements - Revision history

Tuttle at 19:17, 14 September 2011

2011-09-14T19:17:52Z

← Older revision		Revision as of 19:17, 14 September 2011
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	===EA3 Header===		===EA3 Header===
	In encrypted .oma files, the encryption field at offset 6/7 is set to 1 and the last 8 bytes of the header, i.e. offset 0x58 in that header, are the IV for the data starting at offset 0x60.		In encrypted .oma files, the encryption field at offset 6/7 is set to 1 and the last 8 bytes of the header, i.e. offset 0x58 in that header, are the IV for the data starting at offset 0x60.

			==PCM support==
			Oma files can carry linear PCM data, in this case the byte at offset 32 in the EA3 header has the value 4. PCM support is easily integrated with the decryptor and FFmpeg's existing PCM codec. The only format parameters observed so far are: 44.1 kHz sample rate, 16 bit sample size, stereo mode, big-endian. Other parameters might be used, but that needs to be tested with a device (the files cannot be generated with Sonic Stage).

	==ATRAC3plus Decoder==		==ATRAC3plus Decoder==

Tuttle at 12:11, 7 September 2011

2011-09-07T12:11:59Z

Show changes

Tuttle: /* Week 1-3 */

2011-05-23T07:35:09Z

Week 1-3

← Older revision		Revision as of 07:35, 23 May 2011
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	===Week 1-3===		===Week 1-3===

	~~Developing halted~~ due to U.S. work/tax regulations.		No development due to U.S. work/tax regulations.

	==Repository==		==Repository==

Tuttle: Created page with "{{SoCProject|year=2011|student=David Goldwich|mentor=Benjamin Larsson}} ==Abstract== I'm working on the OMA demuxer in libavformat to implement a decryptor for …"

2011-05-23T07:33:23Z

Created page with "{{SoCProject|year=2011|student=David Goldwich|mentor=Benjamin Larsson}} ==Abstract== I'm working on the OMA demuxer in libavformat to implement a decryptor for …"

New page

{{SoCProject|year=2011|student=[[User:tuttle|David Goldwich]]|mentor=Benjamin Larsson}}

==Abstract==

I'm working on the OMA demuxer in libavformat to implement a decryptor for OpenMG protected audio files. If I can complete this task in time, I will work on finishing an ATRAC3plus decoder for libavcodec.

==Progress==

===Week 1-3===

Developing halted due to U.S. work/tax regulations.

==Repository==
[https://github.com/plumbojumbo/FFmpeg https://github.com/plumbojumbo/FFmpeg]

==Contact==

You can reach me at firstname.lastname@gmail.com or as atuttle on Freenode. Feel free to get in touch with me if you have any questions.