decrypt_cenc_isma.c File Reference

#include <gpac/filters.h>
#include <gpac/constants.h>
#include <gpac/crypt_tools.h>
#include <gpac/crypt.h>
#include <gpac/base_coding.h>
#include <gpac/download.h>
#include <gpac/network.h>
#include <gpac/internal/media_dev.h>

Include dependency graph for decrypt_cenc_isma.c:

Data Structures
struct	CENCDecKey
struct	GF_CENCDecCtx
struct	GF_CENCDecStream

Macros
#define	OFFS(_n)   #_n, offsetof(GF_CENCDecCtx, _n)

Enumerations
enum	{ DECRYPT_STATE_ERROR =1 , DECRYPT_STATE_SETUP , DECRYPT_STATE_PLAY }
enum	{   DECRYPT_FULL =0 , DECRYPT_NOKEY , DECRYPT_SKIP , DECRYPT_PAD0 ,   DECRYPT_PAD1 , DECRYPT_PADSC }

Functions
static GF_Err	cenc_dec_setup_isma (GF_CENCDecCtx *ctx, GF_CENCDecStream *cstr, u32 scheme_type, u32 scheme_version, const char *scheme_uri, const char *kms_uri)
static GF_Err	cenc_dec_access_isma (GF_CENCDecCtx *ctx, GF_CENCDecStream *cstr, Bool is_play)
static GF_Err	cenc_dec_process_isma (GF_CENCDecCtx *ctx, GF_CENCDecStream *cstr, GF_FilterPacket *in_pck)
static GF_Err	cenc_dec_load_keys (GF_CENCDecCtx *ctx, GF_CENCDecStream *cstr)
static GF_Err	rfmt_dec_b64 (u8 *data, u8 *output, u32 osize)
static GF_Err	cenc_dec_set_clearkey (GF_CENCDecCtx *ctx, GF_CENCDecStream *cstr, char *ck_url, u8 *ck_kid)
static GF_Err	cenc_dec_set_hls_key (GF_CENCDecCtx *ctx, GF_CENCDecStream *cstr, char *key_url, u8 *key_IV)
static GF_Err	cenc_dec_push_iv (GF_CENCDecStream *cstr, u32 key_idx, u8 *IV, u32 iv_size, u32 const_iv_size, const u8 *const_iv)
static GF_Err	cenc_dec_load_pssh (GF_CENCDecCtx *ctx, GF_CENCDecStream *cstr, const GF_PropertyValue *pssh_prop, Bool is_pck_pssh, const GF_PropertyValue *cinfo_prop)
static GF_Err	cenc_dec_setup_cenc (GF_CENCDecCtx *ctx, GF_CENCDecStream *cstr, u32 scheme_type, u32 scheme_version, const char *scheme_uri, const char *kms_uri)
static GF_Err	cenc_dec_hls_saes (GF_CENCDecCtx *ctx, GF_CENCDecStream *cstr, u32 scheme_type, u32 scheme_version, const char *scheme_uri, const char *kms_uri)
static GF_Err	cenc_dec_setup_adobe (GF_CENCDecCtx *ctx, GF_CENCDecStream *cstr, u32 scheme_type, u32 scheme_version, const char *scheme_uri, const char *kms_uri)
static GF_Err	cenc_dec_access_cenc (GF_CENCDecCtx *ctx, GF_CENCDecStream *cstr, Bool is_play)
static GF_Err	cenc_dec_access_adobe (GF_CENCDecCtx *ctx, GF_CENCDecStream *cstr, Bool is_play)
u8	key_info_get_iv_size (const u8 *key_info, u32 nb_keys, u32 idx, u8 *const_iv_size, const u8 **const_iv)
static GFINLINE void	cenc_decrypt_block (GF_CENCDecCtx *ctx, GF_Crypt *crypt, Bool valid_key, u8 *data, u32 size)
static GF_Err	cenc_dec_process_cenc (GF_CENCDecCtx *ctx, GF_CENCDecStream *cstr, GF_FilterPacket *in_pck)
static GF_Err	cenc_dec_process_hls_saes (GF_CENCDecCtx *ctx, GF_CENCDecStream *cstr, GF_FilterPacket *in_pck)
static GF_Err	cenc_dec_process_adobe (GF_CENCDecCtx *ctx, GF_CENCDecStream *cstr, GF_FilterPacket *in_pck)
static void	cenc_dec_stream_del (GF_CENCDecStream *cstr)
static GF_Err	cenc_dec_configure_pid (GF_Filter *filter, GF_FilterPid *pid, Bool is_remove)
static Bool	cenc_dec_process_event (GF_Filter *filter, const GF_FilterEvent *evt)
static GF_Err	cenc_dec_process (GF_Filter *filter)
static GF_Err	cenc_dec_initialize (GF_Filter *filter)
static void	cenc_dec_finalize (GF_Filter *filter)
const GF_FilterRegister *	cdcrypt_register (GF_FilterSession *session)

Variables
static const GF_FilterCapability	CENCDecCaps []
static const GF_FilterArgs	GF_CENCDecArgs []
GF_FilterRegister	CENCDecRegister

---

Data Structure Documentation

CENCDecKey

struct CENCDecKey

Data Fields
GF_Crypt *	crypt
bin128	key
u32	key_valid

GF_CENCDecCtx

struct GF_CENCDecCtx

Collaboration diagram for GF_CENCDecCtx:

Data Fields
const char *	cfile
u32	decrypt
GF_PropUIntList	drop_keys
GF_PropStringList	kids
GF_PropStringList	keys
GF_CryptInfo *	cinfo
Bool	hls_cenc_patch_iv
GF_Filter *	filter
GF_List *	streams
GF_BitStream *	bs_r
GF_DownloadManager *	dm
u32	pending_keys

GF_CENCDecStream

struct GF_CENCDecStream

Collaboration diagram for GF_CENCDecStream:

Data Fields
GF_CENCDecCtx *	ctx
GF_FilterPid *	ipid
GF_FilterPid *	opid
u32	state
u32	pssh_crc
u32	scheme_type
u32	scheme_version
GF_Err	key_error
CENCDecKey *	crypts
u32	nb_crypts
char	salt[8]
u64	last_IV
u32	nb_allow_play
Bool	is_oma
Bool	is_adobe
u32	preview_range
Bool	is_nalu
Bool	selective_encryption
u32	IV_length
u32	KI_length
Bool	is_cenc
Bool	is_cbc
u32	KID_count
Bool	inband_keys
bin128 *	KIDs
bin128 *	keys
const GF_PropertyValue *	cenc_ki
u32	multikey
const GF_PropertyValue *	cenc_pattern
Bool	crypt_init
Bool	is_hls
bin128	hls_IV
char *	hls_key_url
Bool	is_hls_saes
u32	codec_id
Bool	force_hls_iv
Bool	gpac_master_leaf
bin128	master_key
u32	clearkey_crc
char *	body
u32	res_size
Bool	hdr_done
GF_DownloadSession *	sess
u32	rep_crc
u32	per_crc
u32	as_id

Macro Definition Documentation

OFFS

#define OFFS

(

_n

)

#_n, offsetof(GF_CENCDecCtx, _n)

Enumeration Type Documentation

anonymous enum

anonymous enum

Enumerator
DECRYPT_STATE_ERROR
DECRYPT_STATE_SETUP
DECRYPT_STATE_PLAY

anonymous enum

anonymous enum

Enumerator
DECRYPT_FULL
DECRYPT_NOKEY
DECRYPT_SKIP
DECRYPT_PAD0
DECRYPT_PAD1
DECRYPT_PADSC

Function Documentation

cenc_dec_setup_isma()

static GF_Err cenc_dec_setup_isma ( GF_CENCDecCtx *  ctx, GF_CENCDecStream *  cstr, u32  scheme_type, u32  scheme_version, const char *  scheme_uri, const char *  kms_uri  )

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cenc_dec_access_isma()

static GF_Err cenc_dec_access_isma ( GF_CENCDecCtx *  ctx, GF_CENCDecStream *  cstr, Bool  is_play  )

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cenc_dec_process_isma()

static GF_Err cenc_dec_process_isma ( GF_CENCDecCtx *  ctx, GF_CENCDecStream *  cstr, GF_FilterPacket *  in_pck  )

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cenc_dec_load_keys()

static GF_Err cenc_dec_load_keys ( GF_CENCDecCtx *  ctx, GF_CENCDecStream *  cstr  )

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rfmt_dec_b64()

static GF_Err rfmt_dec_b64 ( u8 *  data, u8 *  output, u32  osize  )

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cenc_dec_set_clearkey()

static GF_Err cenc_dec_set_clearkey ( GF_CENCDecCtx *  ctx, GF_CENCDecStream *  cstr, char *  ck_url, u8 *  ck_kid  )

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cenc_dec_set_hls_key()

static GF_Err cenc_dec_set_hls_key ( GF_CENCDecCtx *  ctx, GF_CENCDecStream *  cstr, char *  key_url, u8 *  key_IV  )

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cenc_dec_push_iv()

static GF_Err cenc_dec_push_iv ( GF_CENCDecStream *  cstr, u32  key_idx, u8 *  IV, u32  iv_size, u32  const_iv_size, const u8 *  const_iv  )

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cenc_dec_load_pssh()

static GF_Err cenc_dec_load_pssh ( GF_CENCDecCtx *  ctx, GF_CENCDecStream *  cstr, const GF_PropertyValue *  pssh_prop, Bool  is_pck_pssh, const GF_PropertyValue *  cinfo_prop  )

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cenc_dec_setup_cenc()

static GF_Err cenc_dec_setup_cenc ( GF_CENCDecCtx *  ctx, GF_CENCDecStream *  cstr, u32  scheme_type, u32  scheme_version, const char *  scheme_uri, const char *  kms_uri  )

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cenc_dec_hls_saes()

static GF_Err cenc_dec_hls_saes ( GF_CENCDecCtx *  ctx, GF_CENCDecStream *  cstr, u32  scheme_type, u32  scheme_version, const char *  scheme_uri, const char *  kms_uri  )

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cenc_dec_setup_adobe()

static GF_Err cenc_dec_setup_adobe ( GF_CENCDecCtx *  ctx, GF_CENCDecStream *  cstr, u32  scheme_type, u32  scheme_version, const char *  scheme_uri, const char *  kms_uri  )

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cenc_dec_access_cenc()

static GF_Err cenc_dec_access_cenc ( GF_CENCDecCtx *  ctx, GF_CENCDecStream *  cstr, Bool  is_play  )

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cenc_dec_access_adobe()

static GF_Err cenc_dec_access_adobe ( GF_CENCDecCtx *  ctx, GF_CENCDecStream *  cstr, Bool  is_play  )

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key_info_get_iv_size()

u8 key_info_get_iv_size	(	const u8 *	key_info,
		u32	nb_keys,
		u32	idx,
		u8 *	const_iv_size,
		const u8 **	const_iv
	)

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cenc_decrypt_block()

static GFINLINE void cenc_decrypt_block ( GF_CENCDecCtx *  ctx, GF_Crypt *  crypt, Bool  valid_key, u8 *  data, u32  size  )

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cenc_dec_process_cenc()

static GF_Err cenc_dec_process_cenc ( GF_CENCDecCtx *  ctx, GF_CENCDecStream *  cstr, GF_FilterPacket *  in_pck  )

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cenc_dec_process_hls_saes()

static GF_Err cenc_dec_process_hls_saes ( GF_CENCDecCtx *  ctx, GF_CENCDecStream *  cstr, GF_FilterPacket *  in_pck  )

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cenc_dec_process_adobe()

static GF_Err cenc_dec_process_adobe ( GF_CENCDecCtx *  ctx, GF_CENCDecStream *  cstr, GF_FilterPacket *  in_pck  )

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cenc_dec_stream_del()

static void cenc_dec_stream_del ( GF_CENCDecStream *  cstr )

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cenc_dec_configure_pid()

static GF_Err cenc_dec_configure_pid ( GF_Filter *  filter, GF_FilterPid *  pid, Bool  is_remove  )

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cenc_dec_process_event()

static Bool cenc_dec_process_event ( GF_Filter *  filter, const GF_FilterEvent *  evt  )

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cenc_dec_process()

static GF_Err cenc_dec_process ( GF_Filter *  filter )

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cenc_dec_initialize()

static GF_Err cenc_dec_initialize ( GF_Filter *  filter )

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cenc_dec_finalize()

static void cenc_dec_finalize ( GF_Filter *  filter )

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cdcrypt_register()

const GF_FilterRegister* cdcrypt_register

(

GF_FilterSession *

session

)

Variable Documentation

CENCDecCaps

const GF_FilterCapability CENCDecCaps[]

static

Initial value:

=
{
        CAP_UINT(GF_CAPS_INPUT,GF_PROP_PID_STREAM_TYPE, GF_STREAM_ENCRYPTED),
        CAP_BOOL(GF_CAPS_INPUT_EXCLUDED,  GF_PROP_PID_UNFRAMED, GF_TRUE),
        CAP_4CC(GF_CAPS_INPUT,GF_PROP_PID_PROTECTION_SCHEME_TYPE, GF_ISOM_ISMACRYP_SCHEME),
        CAP_4CC(GF_CAPS_INPUT,GF_PROP_PID_PROTECTION_SCHEME_TYPE, GF_ISOM_OMADRM_SCHEME),
        CAP_4CC(GF_CAPS_INPUT,GF_PROP_PID_PROTECTION_SCHEME_TYPE, GF_ISOM_CENC_SCHEME),
        CAP_4CC(GF_CAPS_INPUT,GF_PROP_PID_PROTECTION_SCHEME_TYPE, GF_ISOM_CENS_SCHEME),
        CAP_4CC(GF_CAPS_INPUT,GF_PROP_PID_PROTECTION_SCHEME_TYPE, GF_ISOM_CBC_SCHEME),
        CAP_4CC(GF_CAPS_INPUT,GF_PROP_PID_PROTECTION_SCHEME_TYPE, GF_ISOM_CBCS_SCHEME),
        CAP_4CC(GF_CAPS_INPUT,GF_PROP_PID_PROTECTION_SCHEME_TYPE, GF_ISOM_ADOBE_SCHEME),
        CAP_4CC(GF_CAPS_INPUT,GF_PROP_PID_PROTECTION_SCHEME_TYPE, GF_ISOM_PIFF_SCHEME),
        CAP_4CC(GF_CAPS_INPUT,GF_PROP_PID_PROTECTION_SCHEME_TYPE, GF_HLS_SAMPLE_AES_SCHEME),
        CAP_UINT(GF_CAPS_INPUT_EXCLUDED,  GF_PROP_PID_CODECID, GF_CODECID_NONE),
        CAP_UINT(GF_CAPS_OUTPUT_EXCLUDED, GF_PROP_PID_STREAM_TYPE, GF_STREAM_ENCRYPTED),
        CAP_UINT(GF_CAPS_OUTPUT_EXCLUDED, GF_PROP_PID_STREAM_TYPE, GF_STREAM_FILE),
        CAP_BOOL(GF_CAPS_OUTPUT_EXCLUDED, GF_PROP_PID_UNFRAMED, GF_TRUE),
}

GF_CENCDecArgs

const GF_FilterArgs GF_CENCDecArgs[]

static

Initial value:

=
{
        { OFFS(cfile), "crypt file location", GF_PROP_STRING, NULL, NULL, 0},
        { OFFS(decrypt), "decrypt mode (CENC only)\n"
                "- full: decrypt everything, throwing error if keys are not found\n"
                "- nokey: decrypt everything for which a key is found, skip decryption otherwise\n"
                "- skip: decrypt nothing\n"
                "- pad0: decrypt nothing and replace all crypted bits with 0\n"
                "- pad1: decrypt nothing and replace all crypted bits with 1\n"
                "- padsc: decrypt nothing and replace all crypted bytes with start codes"
                , GF_PROP_UINT, "full", "full|nokey|skip|pad0|pad1|padsc", GF_ARG_HINT_ADVANCED},
        { OFFS(drop_keys), "consider keys with given 1-based indexes as not available (multi-key debug)", GF_PROP_UINT_LIST, NULL, NULL, GF_ARG_HINT_EXPERT},
        { OFFS(kids), "define KIDs. If `keys` is empty, consider keys with given KID (as hex string) as not available (debug)", GF_PROP_STRING_LIST, NULL, NULL, GF_ARG_HINT_EXPERT},
        { OFFS(keys), "define key values for each of the specified KID", GF_PROP_STRING_LIST, NULL, NULL, GF_ARG_HINT_EXPERT},
        { OFFS(hls_cenc_patch_iv), "ignore IV updates in some broken HLS+CENC streams", GF_PROP_BOOL, "false", NULL, GF_ARG_HINT_EXPERT},
        {0}
}

CENCDecRegister

GF_FilterRegister CENCDecRegister

Initial value:

= {
        .name = "cdcrypt",
 
        GF_FS_SET_HELP("The CENC decryptor supports decrypting CENC, ISMA, HLS Sample-AES (MPEG2 ts) and Adobe streams.\n"
        "\n"
        "For HLS, key is retrieved according to the key URI in the manifest.\n"
        "Otherwise, the filter uses a configuration file.\n"
        "The syntax is available at https://wiki.gpac.io/xmlformats/Common-Encryption\n"
        "The DRM config file can be set per PID using the property `DecryptInfo` (highest priority), `CryptInfo` (lower priority) "
        "or set at the filter level using [-cfile]() (lowest priority).\n"
        "When the file is set per PID, the first `CryptInfo` with the same ID is used, otherwise the first `CryptInfo` is used."
        "When the file is set globally (not per PID), the first `CrypTrack` in the DRM config file with the same ID is used, otherwise the first `CrypTrack` with ID 0 or not set is used.\n"
        )
        .private_size = sizeof(GF_CENCDecCtx),
        .flags = GF_FS_REG_USE_SYNC_READ,
        .max_extra_pids=-1,
        .args = GF_CENCDecArgs,
        SETCAPS(CENCDecCaps),
        .configure_pid = cenc_dec_configure_pid,
        .initialize = cenc_dec_initialize,
        .finalize = cenc_dec_finalize,
        .process = cenc_dec_process,
        .process_event = cenc_dec_process_event,
        .hint_class_type = GF_FS_CLASS_CRYPTO
}