latm.c File Reference

#include <sys/types.h>
#include <string.h>
#include <stdlib.h>

Data Structures
struct	bebf_t
struct	bebf_latm_t

Macros
#define	LOG_MODULE   "latm"
#define	LOG_VERBOSE
#define	bebf_UNUSED
#define	bebf_ADJ32(v)   (((v) >> 24) | (((v) & 0xff0000) >> 8) | (((v) & 0xff00) << 8) | ((v) << 24))
#define	bebf_shift(nn)
#define	AOTF_SHORT   0x0001 /* frameLengthFlag */
#define	AOTF_CORE   0x0002 /* dependsOnCoreCoder */
#define	AOTF_EXT1   0x0004 /* extensionFlag1 */
#define	AOTF_LAYER   0x0008 /* layerNr */
#define	AOTF_CHAN   0x0010 /* custom channel layout */
#define	AOTF_SUBFR   0x0020 /* subFrames */
#define	AOTF_RESIL   0x0040 /* errorResilienceFlags */
#define	AOTF_LDSBR   0x0080 /* lowDelaySbr */
#define	AOTF_ELD   0x0100 /* enhancedLowDelay */
#define	AOTF_EPCNF   0x0200 /* epConfig */
#define	BEBF_LATM_GOT_CONF   1
#define	BEBF_LATM_GOT_FRAME   2
#define	BEBF_TEST_MAX   (2 * (0x1fff + 3))

Enumerations
enum	bebf_aot_t {   AOT_AAC_MAIN = 1, AOT_AAC_LC = 2, AOT_AAC_SSR = 3, AOT_AAC_LTP = 4,   AOT_SBR = 5, AOT_AAC_SCALABLE = 6, AOT_TWINVQ = 7, AOT_CELP = 8,   AOT_HVXC = 9, AOT_ER_AAC_LC = 17, AOT_ER_AAC_LTP = 19, AOT_ER_AAC_SCALABLE = 20,   AOT_ER_TWINVQ = 21, AOT_ER_BSAC = 22, AOT_ER_AAC_LD = 23, AOT_ER_CELP = 24,   AOT_ER_HVXC = 25, AOT_ER_HILN = 26, AOT_ER_PARAM = 27, AOT_SSC = 28,   AOT_PS = 29, AOT_L1 = 32, AOT_L2 = 33, AOT_L3 = 34,   AOT_ALS = 36, AOT_ER_AAC_ELD = 39 }
enum	bebf_latm_parser_status_t {   BEBF_LATM_NEED_MORE_DATA, BEBF_LATM_IS_RAW, BEBF_LATM_IS_ADTS, BEBF_LATM_IS_LATM,   BEBF_LATM_IS_UNKNOWN }

Functions
static void	bebf_seek (bebf_t *bebf, uint32_t nbits)
static void	bebf_align (bebf_t *bebf)
static void	bebf_set_read (bebf_t *bebf, const uint8_t *rp, uint32_t nbytes)
static void	bebf_set_write (bebf_t *bebf, uint8_t *wp)
static uint32_t	bebf_get (bebf_t *bebf, uint32_t nbits)
static uint32_t	bebf_sniff (bebf_t *bebf, uint32_t nbits)
static void	bebf_skip (bebf_t *bebf, uint32_t nbits)
static uint32_t	bebf_tell (bebf_t *bebf)
static int	bebf_sync (bebf_t *bebf, uint32_t pattern, uint32_t pbits)
static void	bebf_put (bebf_t *bebf, uint32_t bits, uint32_t nbits)
static size_t	bebf_flush (bebf_t *bebf)
static void	bebf_copy (bebf_t *bebf, uint32_t nbits)
static int	bebf_latm_configure (bebf_latm_t *latm, uint32_t nbits)
static int	bebf_latm_demux (bebf_latm_t *latm, const uint8_t *in, uint32_t nbytes)
static void	bebf_latm_open (bebf_latm_t *latm)
static void	bebf_latm_close (bebf_latm_t *latm)
static bebf_latm_parser_status_t	bebf_latm_test (const uint8_t *in, int nbytes)
static int	bebf_latm_parse (bebf_latm_t *latm, const uint8_t *in, int *nbytes)

Variables
static const uint32_t	bebf_latm_flags [40]

Macro Definition Documentation

AOTF_CHAN

#define AOTF_CHAN   0x0010 /* custom channel layout */

AOTF_CORE

#define AOTF_CORE   0x0002 /* dependsOnCoreCoder */

AOTF_ELD

#define AOTF_ELD   0x0100 /* enhancedLowDelay */

AOTF_EPCNF

#define AOTF_EPCNF   0x0200 /* epConfig */

AOTF_EXT1

#define AOTF_EXT1   0x0004 /* extensionFlag1 */

AOTF_LAYER

#define AOTF_LAYER   0x0008 /* layerNr */

AOTF_LDSBR

#define AOTF_LDSBR   0x0080 /* lowDelaySbr */

AOTF_RESIL

#define AOTF_RESIL   0x0040 /* errorResilienceFlags */

AOTF_SHORT

#define AOTF_SHORT   0x0001 /* frameLengthFlag */

AOTF_SUBFR

#define AOTF_SUBFR   0x0020 /* subFrames */

bebf_ADJ32

#define bebf_ADJ32

(

v

)

(((v) >> 24) | (((v) & 0xff0000) >> 8) | (((v) & 0xff00) << 8) | ((v) << 24))

BEBF_LATM_GOT_CONF

#define BEBF_LATM_GOT_CONF   1

BEBF_LATM_GOT_FRAME

#define BEBF_LATM_GOT_FRAME   2

bebf_shift

#define bebf_shift

(

nn

)

Value:

  { \
  uint64_t b = bebf->readcache; \
  do {*q++ = bebf_ADJ32 (b >> 32); b <<= nn; b |= bebf_ADJ32 (*p++); b <<= 32 - nn;} while (--words); \
  bebf->readcache = b; \
}

BEBF_TEST_MAX

#define BEBF_TEST_MAX   (2 * (0x1fff + 3))

bebf_UNUSED

#define bebf_UNUSED

LOG_MODULE

#define LOG_MODULE   "latm"

LOG_VERBOSE

#define LOG_VERBOSE

Enumeration Type Documentation

bebf_aot_t

enum bebf_aot_t

Enumerator
AOT_AAC_MAIN
AOT_AAC_LC
AOT_AAC_SSR
AOT_AAC_LTP
AOT_SBR
AOT_AAC_SCALABLE
AOT_TWINVQ
AOT_CELP
AOT_HVXC
AOT_ER_AAC_LC
AOT_ER_AAC_LTP
AOT_ER_AAC_SCALABLE
AOT_ER_TWINVQ
AOT_ER_BSAC
AOT_ER_AAC_LD
AOT_ER_CELP
AOT_ER_HVXC
AOT_ER_HILN
AOT_ER_PARAM
AOT_SSC
AOT_PS
AOT_L1
AOT_L2
AOT_L3
AOT_ALS
AOT_ER_AAC_ELD

bebf_latm_parser_status_t

enum bebf_latm_parser_status_t

Enumerator
BEBF_LATM_NEED_MORE_DATA
BEBF_LATM_IS_RAW
BEBF_LATM_IS_ADTS
BEBF_LATM_IS_LATM
BEBF_LATM_IS_UNKNOWN

Function Documentation

bebf_align()

static void bebf_align ( bebf_t *  bebf )

static

Align to next byte boundary.

Parameters

bebf	pointer to bebf_t struct to use.

References bebf_t::readbits, and bebf_t::readcache.

Referenced by bebf_latm_configure().

bebf_copy()

static void bebf_copy ( bebf_t *  bebf, uint32_t  nbits  )

static

Copy bits from read stream to write stream verbatim, and try to be fast.

Parameters

bebf	pointer to bebf_t struct to use.
nbits	bit count.

References bebf_ADJ32, bebf_shift, bebf_t::readbits, bebf_t::readcache, bebf_t::readptr, bebf_t::writebits, bebf_t::writecache, and bebf_t::writeptr.

Referenced by bebf_latm_configure(), and bebf_latm_demux().

bebf_flush()

static size_t bebf_flush ( bebf_t *  bebf )

static

Flush out any unsaved data to write stream.

Parameters

bebf	pointer to bebf_t struct to use.

Returns

byte count of write buffer so far.

References bebf_ADJ32, bebf_t::writebits, bebf_t::writecache, bebf_t::writeptr, and bebf_t::writestart.

Referenced by bebf_latm_configure(), and bebf_latm_demux().

bebf_get()

static uint32_t bebf_get ( bebf_t *  bebf, uint32_t  nbits  )

static

Get 1 .. 32 bits of data from read stream.

Parameters

bebf	pointer to bebf_t struct to use.
nbits	bit count.

Returns

the requested data, right justified.

References bebf_ADJ32, bebf_t::readbits, bebf_t::readcache, bebf_t::readptr, and bebf_t::readstop.

Referenced by bebf_latm_configure(), and bebf_latm_demux().

bebf_latm_close()

static void bebf_latm_close ( bebf_latm_t *  latm )

static

References bebf_latm_t::config, bebf_latm_t::fbuflen, bebf_latm_t::frame, bebf_latm_t::framelen, and NULL.

Referenced by faad_dispose(), and faad_reset().

bebf_latm_configure()

static int bebf_latm_configure ( bebf_latm_t *  latm, uint32_t  nbits  )

static

Parse and export AAC configuration data.

Parameters

latm	pointer to bebf_latm_t struct.
nbits	count of input bits or 0.

Returns

BEBF_LATM_GOT_CONF or 0.

References AOT_AAC_LC, AOT_ALS, AOT_ER_BSAC, AOT_PS, AOT_SBR, AOTF_CHAN, AOTF_CORE, AOTF_ELD, AOTF_EPCNF, AOTF_EXT1, AOTF_LAYER, AOTF_LDSBR, AOTF_RESIL, AOTF_SHORT, AOTF_SUBFR, bebf_latm_t::bebf, bebf_align(), bebf_copy(), bebf_flush(), bebf_get(), bebf_latm_flags, BEBF_LATM_GOT_CONF, bebf_seek(), bebf_set_write(), bebf_skip(), bebf_sniff(), bebf_tell(), bebf_latm_t::channel_conf, bebf_latm_t::channel_conf2, bebf_latm_t::confbuflen, bebf_latm_t::config, bebf_latm_t::conflen, bebf_latm_t::numchannels, bebf_latm_t::object_type, bebf_latm_t::object_type2, bebf_latm_t::ps, bebf_latm_t::samplerate, bebf_latm_t::samplerate2, bebf_latm_t::samplerate_index, bebf_latm_t::samplerate_index2, bebf_latm_t::samples, and bebf_latm_t::sbr.

Referenced by bebf_latm_demux().

bebf_latm_demux()

static int bebf_latm_demux ( bebf_latm_t *  latm, const uint8_t *  in, uint32_t  nbytes  )

static

Demultiplex 1 LATM packet.

Parameters

latm	pointer to bebf_latm_t struct.
in	pointer to packet.
nbytes	byte length of packet.

Returns

BEBF_LATM_GOT_* flags.

References bebf_latm_t::bebf, bebf_copy(), bebf_flush(), bebf_get(), bebf_latm_configure(), BEBF_LATM_GOT_FRAME, bebf_set_read(), bebf_set_write(), bebf_skip(), bebf_tell(), bebf_latm_t::conflen, bebf_latm_t::fbuflen, bebf_latm_t::frame, bebf_latm_t::frame_len, bebf_latm_t::frame_len_type, bebf_latm_t::framelen, and bebf_latm_t::version.

Referenced by bebf_latm_parse().

bebf_latm_open()

static void bebf_latm_open ( bebf_latm_t *  latm )

static

Referenced by faad_reset(), and open_plugin().

bebf_latm_parse()

static int bebf_latm_parse ( bebf_latm_t *  latm, const uint8_t *  in, int *  nbytes  )

static

Parse and demux LATM.

Parameters

latm	pointer to bebf_latm_t struct.
in	pointer to input data.
nbytes	pointer to byte count, will be adjusted to consumed.

Returns

BEBF_LATM_GOT_* flags.

References bebf_latm_demux().

Referenced by faad_decode_audio().

bebf_latm_test()

static bebf_latm_parser_status_t bebf_latm_test ( const uint8_t *  in, int  nbytes  )

static

Test if really LATM.

Parameters

in	pointer to input data.
nbytes	byte count.

Returns

status.

References BEBF_LATM_IS_ADTS, BEBF_LATM_IS_LATM, BEBF_LATM_IS_UNKNOWN, BEBF_LATM_NEED_MORE_DATA, and BEBF_TEST_MAX.

Referenced by faad_decode_data().

bebf_put()

static void bebf_put ( bebf_t *  bebf, uint32_t  bits, uint32_t  nbits  )

static

Write 1 .. 32 bits of data to write stream.

Parameters

bebf	pointer to bebf_t struct to use.
bits	The data to write, right justified.
nbits	bit count.

References bebf_ADJ32, bits, bebf_t::writebits, bebf_t::writecache, and bebf_t::writeptr.

bebf_seek()

static void bebf_seek ( bebf_t *  bebf, uint32_t  nbits  )

static

Jump to stream reader bit position.

Parameters

bebf	pointer to bebf_t struct to use.
nbits	new position in bits from the beginning.

References bebf_ADJ32, bebf_t::readbits, bebf_t::readcache, bebf_t::readptr, bebf_t::readstart, and bebf_t::readstop.

Referenced by bebf_latm_configure(), and bebf_set_read().

bebf_set_read()

static void bebf_set_read ( bebf_t *  bebf, const uint8_t *  rp, uint32_t  nbytes  )

static

Initialize big endian bit stream reader.

Parameters

bebf	pointer to bebf_t struct to use.
rp	pointer to read stream, padded by at least 8 bytes.
nbytes	byte length of input.

References bebf_seek(), bebf_t::readstart, and bebf_t::readstop.

Referenced by bebf_latm_demux().

bebf_set_write()

static void bebf_set_write ( bebf_t *  bebf, uint8_t *  wp  )

static

Initialize big endian bit stream writer.

Parameters

bebf	pointer to bebf_t struct to use.
wp	pointer to 4 byte aligned write buffer.

References bebf_t::writebits, bebf_t::writecache, bebf_t::writeptr, and bebf_t::writestart.

Referenced by bebf_latm_configure(), and bebf_latm_demux().

bebf_skip()

static void bebf_skip ( bebf_t *  bebf, uint32_t  nbits  )

static

Discard 1 .. 32 bits of data from read stream.

Parameters

bebf	pointer to bebf_t struct to use.
nbits	bit count.

References bebf_ADJ32, bebf_t::readbits, bebf_t::readcache, bebf_t::readptr, and bebf_t::readstop.

Referenced by bebf_latm_configure(), and bebf_latm_demux().

bebf_sniff()

static uint32_t bebf_sniff ( bebf_t *  bebf, uint32_t  nbits  )

static

Sniff 1 .. 32 bits of data from read stream, not changing the stream position.

Parameters

bebf	pointer to bebf_t struct to use.
nbits	bit count.

Returns

the requested data, right justified.

References bebf_ADJ32, bebf_t::readbits, bebf_t::readcache, bebf_t::readptr, and bebf_t::readstop.

Referenced by bebf_latm_configure().

bebf_sync()

static int bebf_sync ( bebf_t *  bebf, uint32_t  pattern, uint32_t  pbits  )

static

Seek forward to right after next appearence of sync pattern.

Parameters

bebf	pointer to bebf_t struct to use.
pattern	the sync pattern to search for, right justified.
pbits	bit length of pattern.

Returns

1 (found), 0 (end of bitfile reached).

References bebf_ADJ32, bebf_t::readbits, bebf_t::readcache, bebf_t::readptr, and bebf_t::readstop.

bebf_tell()

static uint32_t bebf_tell ( bebf_t *  bebf )

static

Tell current read stream position.

Parameters

bebf	pointer to bebf_t struct to use.

Returns

stream position in bits.

References bebf_t::readbits, bebf_t::readptr, and bebf_t::readstart.

Referenced by bebf_latm_configure(), and bebf_latm_demux().

Variable Documentation

bebf_latm_flags

const uint32_t bebf_latm_flags[40]

static

Referenced by bebf_latm_configure().