On Thu, Jul 16, 2015 at 03:57:26AM +0300, Vesselin Bontchev wrote: > Hi, > > A sample Audible .aax file can be downloaded from the following link, > > https://gitlab.com/vesselin.bontchev/audible-samples/tree/master > > Usage, > > ffmpeg -activation_bytes 62689101 -i Audible_AAX_sample_62689101.aax -vn -c:a > copy -v debug output.mp4 > > Thanks, > Vesselin
> doc/general.texi | 2
> doc/muxers.texi | 7 +++
> libavformat/isom.h | 6 ++
> libavformat/mov.c | 122
> +++++++++++++++++++++++++++++++++++++++++++++++++++++
> 4 files changed, 137 insertions(+)
> d6cf740b4d4f4193458dbf1d8f4e1d2375eb4501
> 0001-Add-support-for-Audible-AAX-and-AAX-files.patch
> From 933c6d8fd44ff4683e16fbed9d5ca01253fc9f94 Mon Sep 17 00:00:00 2001
> From: Vesselin Bontchev <vesselin.bontc...@yandex.com>
> Date: Sat, 11 Jul 2015 18:02:47 +0000
> Subject: [PATCH] Add support for Audible AAX (and AAX+) files
>
> ---
> doc/general.texi | 2 +
> doc/muxers.texi | 7 +++
> libavformat/isom.h | 6 +++
> libavformat/mov.c | 122
> +++++++++++++++++++++++++++++++++++++++++++++++++++++
> 4 files changed, 137 insertions(+)
>
> diff --git a/doc/general.texi b/doc/general.texi
> index dc22d90..617be66 100644
> --- a/doc/general.texi
> +++ b/doc/general.texi
> @@ -226,6 +226,8 @@ library:
> @item 4xm @tab @tab X
> @tab 4X Technologies format, used in some games.
> @item 8088flex TMV @tab @tab X
> +@item AAX @tab @tab X
> + @tab Audible Enhanced Audio format, used in audiobooks.
> @item ACT Voice @tab @tab X
> @tab contains G.729 audio
> @item Adobe Filmstrip @tab X @tab X
> diff --git a/doc/muxers.texi b/doc/muxers.texi
> index d75d7de..b5fc598 100644
> --- a/doc/muxers.texi
> +++ b/doc/muxers.texi
> @@ -667,6 +667,13 @@ point on IIS with this muxer. Example:
> ffmpeg -re @var{<normal input/transcoding options>} -movflags
> isml+frag_keyframe -f ismv
> http://server/publishingpoint.isml/Streams(Encoder1)
> @end example
>
> +@subsection Audible AAX
> +
> +Audible AAX files are encrypted M4B files, and they can be decrypted by
> specifying a 4 byte activation secret.
> +@example
> +ffmpeg -activation_bytes 1CEB00DA -i test.aax -vn -c:a copy output.mp4
> +@end example
> +
> @section mp3
>
> The MP3 muxer writes a raw MP3 stream with the following optional features:
> diff --git a/libavformat/isom.h b/libavformat/isom.h
> index 5d48989..6ea1da1 100644
> --- a/libavformat/isom.h
> +++ b/libavformat/isom.h
> @@ -198,6 +198,12 @@ typedef struct MOVContext {
> MOVFragmentIndex** fragment_index_data;
> unsigned fragment_index_count;
> int atom_depth;
> + unsigned int aax_mode; ///< 'aax' file has been detected
> + uint8_t file_key[20];
> + uint8_t file_iv[20];
> + void *activation_bytes;
> + int activation_bytes_size;
> + struct AVAES *aes_decrypt;
> } MOVContext;
>
> int ff_mp4_read_descr_len(AVIOContext *pb);
> diff --git a/libavformat/mov.c b/libavformat/mov.c
> index 9d6b2e4..b248eb7 100644
> --- a/libavformat/mov.c
> +++ b/libavformat/mov.c
> @@ -37,6 +37,8 @@
> #include "libavutil/dict.h"
> #include "libavutil/display.h"
> #include "libavutil/opt.h"
> +#include "libavutil/aes.h"
> +#include "libavutil/sha.h"
> #include "libavutil/timecode.h"
> #include "libavcodec/ac3tab.h"
> #include "avformat.h"
> @@ -807,6 +809,116 @@ static int mov_read_mdat(MOVContext *c, AVIOContext
> *pb, MOVAtom atom)
> return 0; /* now go for moov */
> }
>
> +#define DRM_BLOB_SIZE 56
> +
> +static int mov_read_adrm(MOVContext *c, AVIOContext *pb, MOVAtom atom)
> +{
> + // extracted from libAAX_SDK.so and AAXSDKWin.dll files!
> + uint8_t fixed_key[] = { 0x77, 0x21, 0x4d, 0x4b, 0x19, 0x6a, 0x87, 0xcd,
> + 0x52, 0x00, 0x45, 0xfd, 0x20, 0xa5, 0x1d,
> 0x67 };
I think this should not be hardcoded but provided by the user via
an AVOption
[...]
> @@ -4058,6 +4171,10 @@ static int mov_read_close(AVFormatContext *s)
> }
> av_freep(&mov->fragment_index_data);
>
> + if (mov->aes_decrypt) {
> + av_free(mov->aes_decrypt);
> + }
the if() is unneeded, and av_freep() should be used
[...]
--
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
During times of universal deceit, telling the truth becomes a
revolutionary act. -- George Orwell
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