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FFmpeg/libavformat/isom.h
Vesselin Bontchev 03fb314acf Add support for playing Audible AAXC (.aaxc) files [PATCH v4] 
The AAXC container format is the same as the (already supported) Audible
AAX format but it uses a different encryption scheme.

Note: audible_key and audible_iv values are variable (per file) and are
externally fed.

It is possible to extend https://github.com/mkb79/Audible to derive the
audible_key and audible_key values.

Relevant code:

def decrypt_voucher(deviceSerialNumber, customerId, deviceType, asin, voucher):
    buf = (deviceType + deviceSerialNumber + customerId + asin).encode("ascii")
    digest = hashlib.sha256(buf).digest()
    key = digest[0:16]
    iv = digest[16:]

    # decrypt "voucher" using AES in CBC mode with no padding
    cipher = AES.new(key, AES.MODE_CBC, iv)
    plaintext = cipher.decrypt(voucher).rstrip(b"\x00")  # improve this!
    return json.loads(plaintext)

The decrypted "voucher" has the required audible_key and audible_iv
values.

Update (Nov-2020): This patch has now been tested by multiple folks -
details at the following URL:

https://github.com/mkb79/Audible/issues/3

Signed-off-by: Vesselin Bontchev <vesselin.bontchev@yandex.com>
2020-11-05 21:40:20 +05:30

390 lines
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/*
* ISO Media common code
* copyright (c) 2001 Fabrice Bellard
* copyright (c) 2002 Francois Revol <revol@free.fr>
* copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@free.fr>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVFORMAT_ISOM_H
#define AVFORMAT_ISOM_H
#include <stddef.h>
#include <stdint.h>
#include "libavutil/encryption_info.h"
#include "libavutil/mastering_display_metadata.h"
#include "libavutil/spherical.h"
#include "libavutil/stereo3d.h"
#include "avio.h"
#include "internal.h"
#include "dv.h"
/* isom.c */
extern const AVCodecTag ff_mp4_obj_type[];
extern const AVCodecTag ff_codec_movvideo_tags[];
extern const AVCodecTag ff_codec_movaudio_tags[];
extern const AVCodecTag ff_codec_movsubtitle_tags[];
extern const AVCodecTag ff_codec_movdata_tags[];
int ff_mov_iso639_to_lang(const char lang[4], int mp4);
int ff_mov_lang_to_iso639(unsigned code, char to[4]);
struct AVAESCTR;
/* the QuickTime file format is quite convoluted...
* it has lots of index tables, each indexing something in another one...
* Here we just use what is needed to read the chunks
*/
typedef struct MOVStts {
unsigned int count;
int duration;
} MOVStts;
typedef struct MOVStsc {
int first;
int count;
int id;
} MOVStsc;
typedef struct MOVElst {
int64_t duration;
int64_t time;
float rate;
} MOVElst;
typedef struct MOVDref {
uint32_t type;
char *path;
char *dir;
char volume[28];
char filename[64];
int16_t nlvl_to, nlvl_from;
} MOVDref;
typedef struct MOVAtom {
uint32_t type;
int64_t size; /* total size (excluding the size and type fields) */
} MOVAtom;
struct MOVParseTableEntry;
typedef struct MOVFragment {
int found_tfhd;
unsigned track_id;
uint64_t base_data_offset;
uint64_t moof_offset;
uint64_t implicit_offset;
unsigned stsd_id;
unsigned duration;
unsigned size;
unsigned flags;
} MOVFragment;
typedef struct MOVTrackExt {
unsigned track_id;
unsigned stsd_id;
unsigned duration;
unsigned size;
unsigned flags;
} MOVTrackExt;
typedef struct MOVSbgp {
unsigned int count;
unsigned int index;
} MOVSbgp;
typedef struct MOVEncryptionIndex {
// Individual encrypted samples. If there are no elements, then the default
// settings will be used.
unsigned int nb_encrypted_samples;
AVEncryptionInfo **encrypted_samples;
uint8_t* auxiliary_info_sizes;
size_t auxiliary_info_sample_count;
uint8_t auxiliary_info_default_size;
uint64_t* auxiliary_offsets; ///< Absolute seek position
size_t auxiliary_offsets_count;
} MOVEncryptionIndex;
typedef struct MOVFragmentStreamInfo {
int id;
int64_t sidx_pts;
int64_t first_tfra_pts;
int64_t tfdt_dts;
int64_t next_trun_dts;
int index_entry;
MOVEncryptionIndex *encryption_index;
} MOVFragmentStreamInfo;
typedef struct MOVFragmentIndexItem {
int64_t moof_offset;
int headers_read;
int current;
int nb_stream_info;
MOVFragmentStreamInfo * stream_info;
} MOVFragmentIndexItem;
typedef struct MOVFragmentIndex {
int allocated_size;
int complete;
int current;
int nb_items;
MOVFragmentIndexItem * item;
} MOVFragmentIndex;
typedef struct MOVIndexRange {
int64_t start;
int64_t end;
} MOVIndexRange;
typedef struct MOVStreamContext {
AVIOContext *pb;
int pb_is_copied;
int ffindex; ///< AVStream index
int next_chunk;
unsigned int chunk_count;
int64_t *chunk_offsets;
unsigned int stts_count;
MOVStts *stts_data;
unsigned int sdtp_count;
uint8_t *sdtp_data;
unsigned int ctts_count;
unsigned int ctts_allocated_size;
MOVStts *ctts_data;
unsigned int stsc_count;
MOVStsc *stsc_data;
unsigned int stsc_index;
int stsc_sample;
unsigned int stps_count;
unsigned *stps_data; ///< partial sync sample for mpeg-2 open gop
MOVElst *elst_data;
unsigned int elst_count;
int ctts_index;
int ctts_sample;
unsigned int sample_size; ///< may contain value calculated from stsd or value from stsz atom
unsigned int stsz_sample_size; ///< always contains sample size from stsz atom
unsigned int sample_count;
int *sample_sizes;
int keyframe_absent;
unsigned int keyframe_count;
int *keyframes;
int time_scale;
int64_t time_offset; ///< time offset of the edit list entries
int64_t min_corrected_pts; ///< minimum Composition time shown by the edits excluding empty edits.
int current_sample;
int64_t current_index;
MOVIndexRange* index_ranges;
MOVIndexRange* current_index_range;
unsigned int bytes_per_frame;
unsigned int samples_per_frame;
int dv_audio_container;
int pseudo_stream_id; ///< -1 means demux all ids
int16_t audio_cid; ///< stsd audio compression id
unsigned drefs_count;
MOVDref *drefs;
int dref_id;
int timecode_track;
int width; ///< tkhd width
int height; ///< tkhd height
int dts_shift; ///< dts shift when ctts is negative
uint32_t palette[256];
int has_palette;
int64_t data_size;
uint32_t tmcd_flags; ///< tmcd track flags
int64_t track_end; ///< used for dts generation in fragmented movie files
int start_pad; ///< amount of samples to skip due to enc-dec delay
unsigned int rap_group_count;
MOVSbgp *rap_group;
int nb_frames_for_fps;
int64_t duration_for_fps;
/** extradata array (and size) for multiple stsd */
uint8_t **extradata;
int *extradata_size;
int last_stsd_index;
int stsd_count;
int stsd_version;
int32_t *display_matrix;
AVStereo3D *stereo3d;
AVSphericalMapping *spherical;
size_t spherical_size;
AVMasteringDisplayMetadata *mastering;
AVContentLightMetadata *coll;
size_t coll_size;
uint32_t format;
int has_sidx; // If there is an sidx entry for this stream.
struct {
struct AVAESCTR* aes_ctr;
unsigned int per_sample_iv_size; // Either 0, 8, or 16.
AVEncryptionInfo *default_encrypted_sample;
MOVEncryptionIndex *encryption_index;
} cenc;
} MOVStreamContext;
typedef struct MOVContext {
const AVClass *class; ///< class for private options
AVFormatContext *fc;
int time_scale;
int64_t duration; ///< duration of the longest track
int found_moov; ///< 'moov' atom has been found
int found_mdat; ///< 'mdat' atom has been found
int found_hdlr_mdta; ///< 'hdlr' atom with type 'mdta' has been found
int trak_index; ///< Index of the current 'trak'
char **meta_keys;
unsigned meta_keys_count;
DVDemuxContext *dv_demux;
AVFormatContext *dv_fctx;
int isom; ///< 1 if file is ISO Media (mp4/3gp)
MOVFragment fragment; ///< current fragment in moof atom
MOVTrackExt *trex_data;
unsigned trex_count;
int itunes_metadata; ///< metadata are itunes style
int handbrake_version;
int *chapter_tracks;
unsigned int nb_chapter_tracks;
int use_absolute_path;
int ignore_editlist;
int advanced_editlist;
int ignore_chapters;
int seek_individually;
int64_t next_root_atom; ///< offset of the next root atom
int export_all;
int export_xmp;
int *bitrates; ///< bitrates read before streams creation
int bitrates_count;
int moov_retry;
int use_mfra_for;
int has_looked_for_mfra;
MOVFragmentIndex frag_index;
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;
void *audible_fixed_key;
int audible_fixed_key_size;
void *audible_key;
int audible_key_size;
void *audible_iv;
int audible_iv_size;
struct AVAES *aes_decrypt;
uint8_t *decryption_key;
int decryption_key_len;
int enable_drefs;
int32_t movie_display_matrix[3][3]; ///< display matrix from mvhd
int have_read_mfra_size;
uint32_t mfra_size;
} MOVContext;
int ff_mp4_read_descr_len(AVIOContext *pb);
int ff_mp4_read_descr(AVFormatContext *fc, AVIOContext *pb, int *tag);
int ff_mp4_read_dec_config_descr(AVFormatContext *fc, AVStream *st, AVIOContext *pb);
void ff_mp4_parse_es_descr(AVIOContext *pb, int *es_id);
#define MP4ODescrTag 0x01
#define MP4IODescrTag 0x02
#define MP4ESDescrTag 0x03
#define MP4DecConfigDescrTag 0x04
#define MP4DecSpecificDescrTag 0x05
#define MP4SLDescrTag 0x06
#define MOV_TFHD_BASE_DATA_OFFSET 0x01
#define MOV_TFHD_STSD_ID 0x02
#define MOV_TFHD_DEFAULT_DURATION 0x08
#define MOV_TFHD_DEFAULT_SIZE 0x10
#define MOV_TFHD_DEFAULT_FLAGS 0x20
#define MOV_TFHD_DURATION_IS_EMPTY 0x010000
#define MOV_TFHD_DEFAULT_BASE_IS_MOOF 0x020000
#define MOV_TRUN_DATA_OFFSET 0x01
#define MOV_TRUN_FIRST_SAMPLE_FLAGS 0x04
#define MOV_TRUN_SAMPLE_DURATION 0x100
#define MOV_TRUN_SAMPLE_SIZE 0x200
#define MOV_TRUN_SAMPLE_FLAGS 0x400
#define MOV_TRUN_SAMPLE_CTS 0x800
#define MOV_FRAG_SAMPLE_FLAG_DEGRADATION_PRIORITY_MASK 0x0000ffff
#define MOV_FRAG_SAMPLE_FLAG_IS_NON_SYNC 0x00010000
#define MOV_FRAG_SAMPLE_FLAG_PADDING_MASK 0x000e0000
#define MOV_FRAG_SAMPLE_FLAG_REDUNDANCY_MASK 0x00300000
#define MOV_FRAG_SAMPLE_FLAG_DEPENDED_MASK 0x00c00000
#define MOV_FRAG_SAMPLE_FLAG_DEPENDS_MASK 0x03000000
#define MOV_FRAG_SAMPLE_FLAG_DEPENDS_NO 0x02000000
#define MOV_FRAG_SAMPLE_FLAG_DEPENDS_YES 0x01000000
#define MOV_TKHD_FLAG_ENABLED 0x0001
#define MOV_TKHD_FLAG_IN_MOVIE 0x0002
#define MOV_TKHD_FLAG_IN_PREVIEW 0x0004
#define MOV_TKHD_FLAG_IN_POSTER 0x0008
#define MOV_SAMPLE_DEPENDENCY_UNKNOWN 0x0
#define MOV_SAMPLE_DEPENDENCY_YES 0x1
#define MOV_SAMPLE_DEPENDENCY_NO 0x2
#define TAG_IS_AVCI(tag) \
((tag) == MKTAG('a', 'i', '5', 'p') || \
(tag) == MKTAG('a', 'i', '5', 'q') || \
(tag) == MKTAG('a', 'i', '5', '2') || \
(tag) == MKTAG('a', 'i', '5', '3') || \
(tag) == MKTAG('a', 'i', '5', '5') || \
(tag) == MKTAG('a', 'i', '5', '6') || \
(tag) == MKTAG('a', 'i', '1', 'p') || \
(tag) == MKTAG('a', 'i', '1', 'q') || \
(tag) == MKTAG('a', 'i', '1', '2') || \
(tag) == MKTAG('a', 'i', '1', '3') || \
(tag) == MKTAG('a', 'i', '1', '5') || \
(tag) == MKTAG('a', 'i', '1', '6') || \
(tag) == MKTAG('a', 'i', 'v', 'x') || \
(tag) == MKTAG('A', 'V', 'i', 'n'))
int ff_mov_read_esds(AVFormatContext *fc, AVIOContext *pb);
int ff_mov_read_stsd_entries(MOVContext *c, AVIOContext *pb, int entries);
void ff_mov_write_chan(AVIOContext *pb, int64_t channel_layout);
#define FF_MOV_FLAG_MFRA_AUTO -1
#define FF_MOV_FLAG_MFRA_DTS 1
#define FF_MOV_FLAG_MFRA_PTS 2
/**
* Compute codec id for 'lpcm' tag.
* See CoreAudioTypes and AudioStreamBasicDescription at Apple.
*/
static inline enum AVCodecID ff_mov_get_lpcm_codec_id(int bps, int flags)
{
/* lpcm flags:
* 0x1 = float
* 0x2 = big-endian
* 0x4 = signed
*/
return ff_get_pcm_codec_id(bps, flags & 1, flags & 2, flags & 4 ? -1 : 0);
}
#endif /* AVFORMAT_ISOM_H */
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