[FFmpeg-devel] support for reading / writing encrypted MP4 files
michaelni at gmx.at
Tue Dec 15 15:35:40 CET 2015
On Tue, Dec 15, 2015 at 09:16:11AM +0000, Eran Kornblau wrote:
> > using a random IV value would break any regression tests
> > see AVFMT_FLAG_BITEXACT
> Fixed, only generating a random IV when bitexact is not enabled.
> Updated patch files attached.
> > is this filling in a random IV that later is overridden ?
> > random_seed() can be slow so it would be better not to call it if
> > its value isnt used
> I didn't think it's too significant since it happens only once per decrypted track, but anyway, fixed it as well.
> I changed av_aes_ctr_init so that it will initialize an empty IV, and exposed av_aes_ctr_set_random_iv.
> This later function is called only by the encoder (and only when bitexact is disabled).
> > --
> > Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
> Thanks !
> Makefile | 2
> aes_ctr.c | 129 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> aes_ctr.h | 83 +++++++++++++++++++++++++++++++++++++++
> version.h | 2
> 4 files changed, 215 insertions(+), 1 deletion(-)
> 1704fc6a8cfb2922b3806a1d1e122b668f743408 0001-libavutil-add-aes-ctr-support.patch
> From 8e6bc361924b6942b879b833c419bb7ea03b516f Mon Sep 17 00:00:00 2001
> From: erankor <eran.kornblau at kaltura.com>
> Date: Mon, 7 Dec 2015 11:58:41 +0200
> Subject: [PATCH 1/3] libavutil: add aes-ctr support
patch 1 and 2 applied
if you want to maintain the code in the future then please send a
patch that adds you to the maintainers file
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
Into a blind darkness they enter who follow after the Ignorance,
they as if into a greater darkness enter who devote themselves
to the Knowledge alone. -- Isha Upanishad
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