apedec.c File Reference

#include <inttypes.h>
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/crc.h"
#include "libavutil/opt.h"
#include "lossless_audiodsp.h"
#include "avcodec.h"
#include "bswapdsp.h"
#include "bytestream.h"
#include "internal.h"
#include "get_bits.h"
#include "unary.h"

Go to the source code of this file.

Data Structures
struct	APEFilter
	Filters applied to the decoded data. More...
struct	APERice
struct	APERangecoder
struct	APEPredictor
	Filter histories. More...
struct	APEContext
	Decoder context. More...

Macros
#define	MAX_CHANNELS   2
#define	MAX_BYTESPERSAMPLE   3
#define	APE_FRAMECODE_MONO_SILENCE   1
#define	APE_FRAMECODE_STEREO_SILENCE   3
#define	APE_FRAMECODE_PSEUDO_STEREO   4
#define	HISTORY_SIZE   512
#define	PREDICTOR_ORDER   8
#define	PREDICTOR_SIZE   50
	Total size of all predictor histories. More...
#define	YDELAYA   (18 + PREDICTOR_ORDER*4)
#define	YDELAYB   (18 + PREDICTOR_ORDER*3)
#define	XDELAYA   (18 + PREDICTOR_ORDER*2)
#define	XDELAYB   (18 + PREDICTOR_ORDER)
#define	YADAPTCOEFFSA   18
#define	XADAPTCOEFFSA   14
#define	YADAPTCOEFFSB   10
#define	XADAPTCOEFFSB   5
#define	APE_FILTER_LEVELS   3
#define	OFFSET(x)   offsetof(APEContext, x)
#define	PAR   (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM)

Enumerations
enum	APECompressionLevel {   COMPRESSION_LEVEL_FAST = 1000, COMPRESSION_LEVEL_NORMAL = 2000, COMPRESSION_LEVEL_HIGH = 3000, COMPRESSION_LEVEL_EXTRA_HIGH = 4000,   COMPRESSION_LEVEL_INSANE = 5000 }
	Possible compression levels. More...

Functions
static void	ape_apply_filters (APEContext *ctx, int32_t *decoded0, int32_t *decoded1, int count)
static void	entropy_decode_mono_0000 (APEContext *ctx, int blockstodecode)
static void	entropy_decode_stereo_0000 (APEContext *ctx, int blockstodecode)
static void	entropy_decode_mono_3860 (APEContext *ctx, int blockstodecode)
static void	entropy_decode_stereo_3860 (APEContext *ctx, int blockstodecode)
static void	entropy_decode_mono_3900 (APEContext *ctx, int blockstodecode)
static void	entropy_decode_stereo_3900 (APEContext *ctx, int blockstodecode)
static void	entropy_decode_stereo_3930 (APEContext *ctx, int blockstodecode)
static void	entropy_decode_mono_3990 (APEContext *ctx, int blockstodecode)
static void	entropy_decode_stereo_3990 (APEContext *ctx, int blockstodecode)
static void	predictor_decode_mono_3800 (APEContext *ctx, int count)
static void	predictor_decode_stereo_3800 (APEContext *ctx, int count)
static void	predictor_decode_mono_3930 (APEContext *ctx, int count)
static void	predictor_decode_stereo_3930 (APEContext *ctx, int count)
static void	predictor_decode_mono_3950 (APEContext *ctx, int count)
static void	predictor_decode_stereo_3950 (APEContext *ctx, int count)
static av_cold int	ape_decode_close (AVCodecContext *avctx)
static av_cold int	ape_decode_init (AVCodecContext *avctx)
static void	update_rice (APERice *rice, unsigned int x)
static int	get_rice_ook (GetBitContext *gb, int k)
static int	ape_decode_value_3860 (APEContext *ctx, GetBitContext *gb, APERice *rice)
static int	ape_decode_value_3900 (APEContext *ctx, APERice *rice)
static int	ape_decode_value_3990 (APEContext *ctx, APERice *rice)
static int	get_k (int ksum)
static void	decode_array_0000 (APEContext *ctx, GetBitContext *gb, int32_t *out, APERice *rice, int blockstodecode)
static int	init_entropy_decoder (APEContext *ctx)
static void	init_predictor_decoder (APEContext *ctx)
static int	APESIGN (int32_t x)
	Get inverse sign of integer (-1 for positive, 1 for negative and 0 for zero) More...
static av_always_inline int	filter_fast_3320 (APEPredictor *p, const int decoded, const int filter, const int delayA)
static av_always_inline int	filter_3800 (APEPredictor *p, const unsigned decoded, const int filter, const int delayA, const int delayB, const int start, const int shift)
static void	long_filter_high_3800 (int32_t *buffer, int order, int shift, int length)
static void	long_filter_ehigh_3830 (int32_t *buffer, int length)
static av_always_inline int	predictor_update_3930 (APEPredictor *p, const int decoded, const int filter, const int delayA)
static av_always_inline int	predictor_update_filter (APEPredictor *p, const int decoded, const int filter, const int delayA, const int delayB, const int adaptA, const int adaptB)
static void	do_init_filter (APEFilter *f, int16_t *buf, int order)
static void	init_filter (APEContext *ctx, APEFilter *f, int16_t *buf, int order)
static void	do_apply_filter (APEContext *ctx, int version, APEFilter *f, int32_t *data, int count, int order, int fracbits)
static void	apply_filter (APEContext *ctx, APEFilter *f, int32_t *data0, int32_t *data1, int count, int order, int fracbits)
static int	init_frame_decoder (APEContext *ctx)
static void	ape_unpack_mono (APEContext *ctx, int count)
static void	ape_unpack_stereo (APEContext *ctx, int count)
static int	ape_decode_frame (AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
static void	ape_flush (AVCodecContext *avctx)

Variables
static const uint16_t	ape_filter_orders [5][APE_FILTER_LEVELS]
	Filter orders depending on compression level. More...
static const uint8_t	ape_filter_fracbits [5][APE_FILTER_LEVELS]
	Filter fraction bits depending on compression level. More...
static const int32_t	initial_coeffs_fast_3320 [1]
static const int32_t	initial_coeffs_a_3800 [3]
static const int32_t	initial_coeffs_b_3800 [2]
static const int32_t	initial_coeffs_3930 [4]
static const AVOption	options []
static const AVClass	ape_decoder_class
AVCodec	ff_ape_decoder

APE range decoding functions
#define	CODE_BITS   32
#define	TOP_VALUE   ((unsigned int)1 << (CODE_BITS-1))
#define	SHIFT_BITS   (CODE_BITS - 9)
#define	EXTRA_BITS   ((CODE_BITS-2) % 8 + 1)
#define	BOTTOM_VALUE   (TOP_VALUE >> 8)
#define	MODEL_ELEMENTS   64
static const uint16_t	counts_3970 [22]
	Fixed probabilities for symbols in Monkey Audio version 3.97. More...
static const uint16_t	counts_diff_3970 [21]
	Probability ranges for symbols in Monkey Audio version 3.97. More...
static const uint16_t	counts_3980 [22]
	Fixed probabilities for symbols in Monkey Audio version 3.98. More...
static const uint16_t	counts_diff_3980 [21]
	Probability ranges for symbols in Monkey Audio version 3.98. More...
static void	range_start_decoding (APEContext *ctx)
	Start the decoder. More...
static void	range_dec_normalize (APEContext *ctx)
	Perform normalization. More...
static int	range_decode_culfreq (APEContext *ctx, int tot_f)
	Calculate cumulative frequency for next symbol. More...
static int	range_decode_culshift (APEContext *ctx, int shift)
	Decode value with given size in bits. More...
static void	range_decode_update (APEContext *ctx, int sy_f, int lt_f)
	Update decoding state. More...
static int	range_decode_bits (APEContext *ctx, int n)
	Decode n bits (n <= 16) without modelling. More...
static int	range_get_symbol (APEContext *ctx, const uint16_t counts[], const uint16_t counts_diff[])
	Decode symbol. More...

Detailed Description

Monkey's Audio lossless audio decoder

Definition in file apedec.c.

Macro Definition Documentation

MAX_CHANNELS

#define MAX_CHANNELS   2

Definition at line 42 of file apedec.c.

MAX_BYTESPERSAMPLE

#define MAX_BYTESPERSAMPLE   3

Definition at line 43 of file apedec.c.

APE_FRAMECODE_MONO_SILENCE

#define APE_FRAMECODE_MONO_SILENCE   1

Definition at line 45 of file apedec.c.

APE_FRAMECODE_STEREO_SILENCE

#define APE_FRAMECODE_STEREO_SILENCE   3

Definition at line 46 of file apedec.c.

APE_FRAMECODE_PSEUDO_STEREO

#define APE_FRAMECODE_PSEUDO_STEREO   4

Definition at line 47 of file apedec.c.

HISTORY_SIZE

#define HISTORY_SIZE   512

Definition at line 49 of file apedec.c.

PREDICTOR_ORDER

#define PREDICTOR_ORDER   8

Definition at line 50 of file apedec.c.

PREDICTOR_SIZE

#define PREDICTOR_SIZE   50

Total size of all predictor histories.

Definition at line 52 of file apedec.c.

YDELAYA

#define YDELAYA   (18 + PREDICTOR_ORDER*4)

Definition at line 54 of file apedec.c.

YDELAYB

#define YDELAYB   (18 + PREDICTOR_ORDER*3)

Definition at line 55 of file apedec.c.

XDELAYA

#define XDELAYA   (18 + PREDICTOR_ORDER*2)

Definition at line 56 of file apedec.c.

XDELAYB

#define XDELAYB   (18 + PREDICTOR_ORDER)

Definition at line 57 of file apedec.c.

YADAPTCOEFFSA

#define YADAPTCOEFFSA   18

Definition at line 59 of file apedec.c.

XADAPTCOEFFSA

#define XADAPTCOEFFSA   14

Definition at line 60 of file apedec.c.

YADAPTCOEFFSB

#define YADAPTCOEFFSB   10

Definition at line 61 of file apedec.c.

XADAPTCOEFFSB

#define XADAPTCOEFFSB   5

Definition at line 62 of file apedec.c.

APE_FILTER_LEVELS

#define APE_FILTER_LEVELS   3

Definition at line 77 of file apedec.c.

CODE_BITS

#define CODE_BITS   32

Definition at line 313 of file apedec.c.

TOP_VALUE

#define TOP_VALUE   ((unsigned int)1 << (CODE_BITS-1))

Definition at line 314 of file apedec.c.

SHIFT_BITS

#define SHIFT_BITS   (CODE_BITS - 9)

Definition at line 315 of file apedec.c.

EXTRA_BITS

#define EXTRA_BITS   ((CODE_BITS-2) % 8 + 1)

Definition at line 316 of file apedec.c.

BOTTOM_VALUE

#define BOTTOM_VALUE   (TOP_VALUE >> 8)

Definition at line 317 of file apedec.c.

MODEL_ELEMENTS

#define MODEL_ELEMENTS   64

Definition at line 390 of file apedec.c.

OFFSET

#define OFFSET

(

x

)

offsetof(APEContext, x)

Definition at line 1615 of file apedec.c.

PAR

#define PAR   (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM)

Definition at line 1616 of file apedec.c.

Enumeration Type Documentation

APECompressionLevel

enum APECompressionLevel

Possible compression levels.

Enumerator
COMPRESSION_LEVEL_FAST
COMPRESSION_LEVEL_NORMAL
COMPRESSION_LEVEL_HIGH
COMPRESSION_LEVEL_EXTRA_HIGH
COMPRESSION_LEVEL_INSANE

Definition at line 68 of file apedec.c.

Function Documentation

ape_apply_filters()

static void ape_apply_filters ( APEContext *  ctx, int32_t *  decoded0, int32_t *  decoded1, int  count  )

static

Definition at line 1352 of file apedec.c.

Referenced by predictor_decode_mono_3930(), predictor_decode_mono_3950(), predictor_decode_stereo_3930(), and predictor_decode_stereo_3950().

entropy_decode_mono_0000()

static void entropy_decode_mono_0000 ( APEContext *  ctx, int  blockstodecode  )

static

Definition at line 654 of file apedec.c.

Referenced by ape_decode_init().

entropy_decode_stereo_0000()

static void entropy_decode_stereo_0000 ( APEContext *  ctx, int  blockstodecode  )

static

Definition at line 660 of file apedec.c.

Referenced by ape_decode_init().

entropy_decode_mono_3860()

static void entropy_decode_mono_3860 ( APEContext *  ctx, int  blockstodecode  )

static

Definition at line 668 of file apedec.c.

Referenced by ape_decode_init().

entropy_decode_stereo_3860()

static void entropy_decode_stereo_3860 ( APEContext *  ctx, int  blockstodecode  )

static

Definition at line 676 of file apedec.c.

Referenced by ape_decode_init().

entropy_decode_mono_3900()

static void entropy_decode_mono_3900 ( APEContext *  ctx, int  blockstodecode  )

static

Definition at line 688 of file apedec.c.

Referenced by ape_decode_init().

entropy_decode_stereo_3900()

static void entropy_decode_stereo_3900 ( APEContext *  ctx, int  blockstodecode  )

static

Definition at line 696 of file apedec.c.

Referenced by ape_decode_init().

entropy_decode_stereo_3930()

static void entropy_decode_stereo_3930 ( APEContext *  ctx, int  blockstodecode  )

static

Definition at line 712 of file apedec.c.

Referenced by ape_decode_init().

entropy_decode_mono_3990()

static void entropy_decode_mono_3990 ( APEContext *  ctx, int  blockstodecode  )

static

Definition at line 723 of file apedec.c.

Referenced by ape_decode_init().

entropy_decode_stereo_3990()

static void entropy_decode_stereo_3990 ( APEContext *  ctx, int  blockstodecode  )

static

Definition at line 731 of file apedec.c.

Referenced by ape_decode_init().

predictor_decode_mono_3800()

static void predictor_decode_mono_3800 ( APEContext *  ctx, int  count  )

static

Definition at line 1014 of file apedec.c.

Referenced by ape_decode_init().

predictor_decode_stereo_3800()

static void predictor_decode_stereo_3800 ( APEContext *  ctx, int  count  )

static

Definition at line 959 of file apedec.c.

Referenced by ape_decode_init().

predictor_decode_mono_3930()

static void predictor_decode_mono_3930 ( APEContext *  ctx, int  count  )

static

Definition at line 1117 of file apedec.c.

Referenced by ape_decode_init().

predictor_decode_stereo_3930()

static void predictor_decode_stereo_3930 ( APEContext *  ctx, int  count  )

static

Definition at line 1089 of file apedec.c.

Referenced by ape_decode_init().

predictor_decode_mono_3950()

static void predictor_decode_mono_3950 ( APEContext *  ctx, int  count  )

static

Definition at line 1215 of file apedec.c.

Referenced by ape_decode_init().

predictor_decode_stereo_3950()

static void predictor_decode_stereo_3950 ( APEContext *  ctx, int  count  )

static

Definition at line 1186 of file apedec.c.

Referenced by ape_decode_init().

ape_decode_close()

static av_cold int ape_decode_close ( AVCodecContext *  avctx )

static

Definition at line 202 of file apedec.c.

Referenced by ape_decode_init().

ape_decode_init()

static av_cold int ape_decode_init ( AVCodecContext *  avctx )

static

Definition at line 217 of file apedec.c.

range_start_decoding()

static void range_start_decoding ( APEContext *  ctx )

inlinestatic

Start the decoder.

Definition at line 320 of file apedec.c.

Referenced by entropy_decode_stereo_3900(), and init_entropy_decoder().

range_dec_normalize()

static void range_dec_normalize ( APEContext *  ctx )

inlinestatic

Perform normalization.

Definition at line 328 of file apedec.c.

Referenced by entropy_decode_stereo_3900(), range_decode_culfreq(), and range_decode_culshift().

range_decode_culfreq()

static int range_decode_culfreq ( APEContext *  ctx, int  tot_f  )

inlinestatic

Calculate cumulative frequency for next symbol.

Does NO update!

Parameters

ctx	decoder context
tot_f	is the total frequency or (code_value)1<<shift

Returns

the cumulative frequency

Definition at line 349 of file apedec.c.

Referenced by ape_decode_value_3990().

range_decode_culshift()

static int range_decode_culshift ( APEContext *  ctx, int  shift  )

inlinestatic

Decode value with given size in bits.

Parameters

ctx	decoder context
shift	number of bits to decode

Definition at line 361 of file apedec.c.

Referenced by range_decode_bits(), and range_get_symbol().

range_decode_update()

static void range_decode_update ( APEContext *  ctx, int  sy_f, int  lt_f  )

inlinestatic

Update decoding state.

Parameters

ctx	decoder context
sy_f	the interval length (frequency of the symbol)
lt_f	the lower end (frequency sum of < symbols)

Definition at line 375 of file apedec.c.

Referenced by ape_decode_value_3990(), range_decode_bits(), and range_get_symbol().

range_decode_bits()

static int range_decode_bits ( APEContext *  ctx, int  n  )

inlinestatic

Decode n bits (n <= 16) without modelling.

Definition at line 382 of file apedec.c.

Referenced by ape_decode_value_3900(), and ape_decode_value_3990().

range_get_symbol()

static int range_get_symbol ( APEContext *  ctx, const uint16_t  counts[], const uint16_t  counts_diff[]  )

inlinestatic

Decode symbol.

Parameters

ctx	decoder context
counts	probability range start position
counts_diff	probability range widths

Definition at line 434 of file apedec.c.

Referenced by ape_decode_value_3900(), and ape_decode_value_3990().

update_rice()

static void update_rice ( APERice *  rice, unsigned int  x  )

inlinestatic

Definition at line 458 of file apedec.c.

Referenced by ape_decode_value_3900(), and ape_decode_value_3990().

get_rice_ook()

static int get_rice_ook ( GetBitContext *  gb, int  k  )

inlinestatic

Definition at line 469 of file apedec.c.

Referenced by decode_array_0000().

ape_decode_value_3860()

static int ape_decode_value_3860 ( APEContext *  ctx, GetBitContext *  gb, APERice *  rice  )

inlinestatic

Definition at line 481 of file apedec.c.

Referenced by entropy_decode_mono_3860(), and entropy_decode_stereo_3860().

ape_decode_value_3900()

static int ape_decode_value_3900 ( APEContext *  ctx, APERice *  rice  )

inlinestatic

Definition at line 514 of file apedec.c.

Referenced by entropy_decode_mono_3900(), entropy_decode_stereo_3900(), and entropy_decode_stereo_3930().

ape_decode_value_3990()

static int ape_decode_value_3990 ( APEContext *  ctx, APERice *  rice  )

inlinestatic

Definition at line 548 of file apedec.c.

Referenced by entropy_decode_mono_3990(), and entropy_decode_stereo_3990().

get_k()

static int get_k ( int  ksum )

static

Definition at line 591 of file apedec.c.

Referenced by decode_array_0000().

decode_array_0000()

static void decode_array_0000 ( APEContext *  ctx, GetBitContext *  gb, int32_t *  out, APERice *  rice, int  blockstodecode  )

static

Definition at line 596 of file apedec.c.

Referenced by entropy_decode_mono_0000(), and entropy_decode_stereo_0000().

init_entropy_decoder()

static int init_entropy_decoder ( APEContext *  ctx )

static

Definition at line 742 of file apedec.c.

Referenced by init_frame_decoder().

init_predictor_decoder()

static void init_predictor_decoder ( APEContext *  ctx )

static

Definition at line 796 of file apedec.c.

Referenced by init_frame_decoder().

APESIGN()

static int APESIGN ( int32_t  x )

inlinestatic

Get inverse sign of integer (-1 for positive, 1 for negative and 0 for zero)

Definition at line 837 of file apedec.c.

Referenced by do_apply_filter(), filter_3800(), long_filter_ehigh_3830(), long_filter_high_3800(), predictor_decode_mono_3950(), predictor_update_3930(), and predictor_update_filter().

filter_fast_3320()

static av_always_inline int filter_fast_3320 ( APEPredictor *  p, const int  decoded, const int  filter, const int  delayA  )

static

Definition at line 841 of file apedec.c.

Referenced by predictor_decode_mono_3800(), and predictor_decode_stereo_3800().

filter_3800()

static av_always_inline int filter_3800 ( APEPredictor *  p, const unsigned  decoded, const int  filter, const int  delayA, const int  delayB, const int  start, const int  shift  )

static

Definition at line 867 of file apedec.c.

Referenced by predictor_decode_mono_3800(), and predictor_decode_stereo_3800().

long_filter_high_3800()

static void long_filter_high_3800 ( int32_t *  buffer, int  order, int  shift, int  length  )

static

Definition at line 912 of file apedec.c.

Referenced by predictor_decode_mono_3800(), and predictor_decode_stereo_3800().

long_filter_ehigh_3830()

static void long_filter_ehigh_3830 ( int32_t *  buffer, int  length  )

static

Definition at line 938 of file apedec.c.

Referenced by predictor_decode_mono_3800(), and predictor_decode_stereo_3800().

predictor_update_3930()

static av_always_inline int predictor_update_3930 ( APEPredictor *  p, const int  decoded, const int  filter, const int  delayA  )

static

Definition at line 1059 of file apedec.c.

Referenced by predictor_decode_mono_3930(), and predictor_decode_stereo_3930().

predictor_update_filter()

static av_always_inline int predictor_update_filter ( APEPredictor *  p, const int  decoded, const int  filter, const int  delayA, const int  delayB, const int  adaptA, const int  adaptB  )

static

Definition at line 1139 of file apedec.c.

Referenced by predictor_decode_stereo_3950().

do_init_filter()

static void do_init_filter ( APEFilter *  f, int16_t *  buf, int  order  )

static

Definition at line 1263 of file apedec.c.

Referenced by init_filter().

init_filter()

static void init_filter ( APEContext *  ctx, APEFilter *  f, int16_t *  buf, int  order  )

static

Definition at line 1275 of file apedec.c.

Referenced by init_frame_decoder().

do_apply_filter()

static void do_apply_filter ( APEContext *  ctx, int  version, APEFilter *  f, int32_t *  data, int  count, int  order, int  fracbits  )

static

Definition at line 1281 of file apedec.c.

Referenced by apply_filter().

apply_filter()

static void apply_filter ( APEContext *  ctx, APEFilter *  f, int32_t *  data0, int32_t *  data1, int  count, int  order, int  fracbits  )

static

Definition at line 1343 of file apedec.c.

Referenced by ape_apply_filters().

init_frame_decoder()

static int init_frame_decoder ( APEContext *  ctx )

static

Definition at line 1366 of file apedec.c.

Referenced by ape_decode_frame().

ape_unpack_mono()

static void ape_unpack_mono ( APEContext *  ctx, int  count  )

static

Definition at line 1382 of file apedec.c.

Referenced by ape_decode_frame().

ape_unpack_stereo()

static void ape_unpack_stereo ( APEContext *  ctx, int  count  )

static

Definition at line 1403 of file apedec.c.

Referenced by ape_decode_frame().

ape_decode_frame()

static int ape_decode_frame ( AVCodecContext *  avctx, void *  data, int *  got_frame_ptr, AVPacket *  avpkt  )

static

Definition at line 1432 of file apedec.c.

ape_flush()

static void ape_flush ( AVCodecContext *  avctx )

static

Definition at line 1609 of file apedec.c.

Variable Documentation

ape_filter_orders

const uint16_t ape_filter_orders[5][APE_FILTER_LEVELS]

static

Initial value:

= {
    {  0,   0,    0 },
    { 16,   0,    0 },
    { 64,   0,    0 },
    { 32, 256,    0 },
    { 16, 256, 1280 }
}

Filter orders depending on compression level.

Definition at line 80 of file apedec.c.

Referenced by ape_apply_filters(), ape_decode_init(), and init_frame_decoder().

ape_filter_fracbits

const uint8_t ape_filter_fracbits[5][APE_FILTER_LEVELS]

static

Initial value:

= {
    {  0,  0,  0 },
    { 11,  0,  0 },
    { 11,  0,  0 },
    { 10, 13,  0 },
    { 11, 13, 15 }
}

Filter fraction bits depending on compression level.

Definition at line 89 of file apedec.c.

Referenced by ape_apply_filters().

counts_3970

const uint16_t counts_3970[22]

static

Initial value:

= {
        0, 14824, 28224, 39348, 47855, 53994, 58171, 60926,
    62682, 63786, 64463, 64878, 65126, 65276, 65365, 65419,
    65450, 65469, 65480, 65487, 65491, 65493,
}

Fixed probabilities for symbols in Monkey Audio version 3.97.

Definition at line 395 of file apedec.c.

Referenced by ape_decode_value_3900().

counts_diff_3970

const uint16_t counts_diff_3970[21]

static

Initial value:

= {
    14824, 13400, 11124, 8507, 6139, 4177, 2755, 1756,
    1104, 677, 415, 248, 150, 89, 54, 31,
    19, 11, 7, 4, 2,
}

Probability ranges for symbols in Monkey Audio version 3.97.

Definition at line 404 of file apedec.c.

Referenced by ape_decode_value_3900().

counts_3980

const uint16_t counts_3980[22]

static

Initial value:

= {
        0, 19578, 36160, 48417, 56323, 60899, 63265, 64435,
    64971, 65232, 65351, 65416, 65447, 65466, 65476, 65482,
    65485, 65488, 65490, 65491, 65492, 65493,
}

Fixed probabilities for symbols in Monkey Audio version 3.98.

Definition at line 413 of file apedec.c.

Referenced by ape_decode_value_3990().

counts_diff_3980

const uint16_t counts_diff_3980[21]

static

Initial value:

= {
    19578, 16582, 12257, 7906, 4576, 2366, 1170, 536,
    261, 119, 65, 31, 19, 10, 6, 3,
    3, 2, 1, 1, 1,
}

Probability ranges for symbols in Monkey Audio version 3.98.

Definition at line 422 of file apedec.c.

Referenced by ape_decode_value_3990().

initial_coeffs_fast_3320

const int32_t initial_coeffs_fast_3320[1]

static

Initial value:

= {
    375,
}

Definition at line 780 of file apedec.c.

Referenced by init_predictor_decoder().

initial_coeffs_a_3800

const int32_t initial_coeffs_a_3800[3]

static

Initial value:

= {
    64, 115, 64,
}

Definition at line 784 of file apedec.c.

Referenced by init_predictor_decoder().

initial_coeffs_b_3800

const int32_t initial_coeffs_b_3800[2]

static

Initial value:

= {
    740, 0
}

Definition at line 788 of file apedec.c.

Referenced by init_predictor_decoder().

initial_coeffs_3930

const int32_t initial_coeffs_3930[4]

static

Initial value:

= {
    360, 317, -109, 98
}

Definition at line 792 of file apedec.c.

Referenced by init_predictor_decoder().

options

const AVOption options[]

static

Initial value:

= {
    { "max_samples", "maximum number of samples decoded per call",             OFFSET(blocks_per_loop), AV_OPT_TYPE_INT,   { .i64 = 4608 },    1,       INT_MAX, PAR, "max_samples" },
    { "all",         "no maximum. decode all samples for each packet at once", 0,                       AV_OPT_TYPE_CONST, { .i64 = INT_MAX }, INT_MIN, INT_MAX, PAR, "max_samples" },
    { NULL},
}

Definition at line 1617 of file apedec.c.

ape_decoder_class

const AVClass ape_decoder_class

static

Initial value:

= {
    .class_name = "APE decoder",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
}

Definition at line 1623 of file apedec.c.

ff_ape_decoder

AVCodec ff_ape_decoder

Initial value:

= {
    .name           = "ape",
    .long_name      = NULL_IF_CONFIG_SMALL("Monkey's Audio"),
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = AV_CODEC_ID_APE,
    .priv_data_size = sizeof(APEContext),
    .init           = ape_decode_init,
    .close          = ape_decode_close,
    .decode         = ape_decode_frame,
    .capabilities   = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DELAY |
                      AV_CODEC_CAP_DR1,
    .flush          = ape_flush,
    .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P,
                                                      AV_SAMPLE_FMT_S16P,
                                                      AV_SAMPLE_FMT_S32P,
                                                      AV_SAMPLE_FMT_NONE },
    .priv_class     = &ape_decoder_class,
}

Definition at line 1630 of file apedec.c.