apedec.c File Reference

Monkey's Audio lossless audio decoder. More...

#include <inttypes.h>
#include "libavutil/attributes.h"
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/crc.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "lossless_audiodsp.h"
#include "avcodec.h"
#include "bswapdsp.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "decode.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	APEPredictor64
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.
#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)
#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)
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 (APEPredictor64 *p, const int decoded, const int filter, const int delayA, const int delayB, const int adaptA, const int adaptB, int interim_mode)
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, AVFrame *frame, int *got_frame_ptr, AVPacket *avpkt)
static av_cold void	ape_flush (AVCodecContext *avctx)

Variables
static const uint16_t	ape_filter_orders [5][APE_FILTER_LEVELS]
	Filter orders depending on compression level.
static const uint8_t	ape_filter_fracbits [5][APE_FILTER_LEVELS]
	Filter fraction bits depending on compression level.
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 int64_t	initial_coeffs_3930_64bit [4]
static const AVOption	options []
static const AVClass	ape_decoder_class
const FFCodec	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.
static const uint16_t	counts_diff_3970 [21]
	Probability ranges for symbols in Monkey Audio version 3.97.
static const uint16_t	counts_3980 [22]
	Fixed probabilities for symbols in Monkey Audio version 3.98.
static const uint16_t	counts_diff_3980 [21]
	Probability ranges for symbols in Monkey Audio version 3.98.
static void	range_start_decoding (APEContext *ctx)
	Start the decoder.
static void	range_dec_normalize (APEContext *ctx)
	Perform normalization.
static int	range_decode_culfreq (APEContext *ctx, int tot_f)
	Calculate cumulative frequency for next symbol.
static int	range_decode_culshift (APEContext *ctx, int shift)
	Decode value with given size in bits.
static void	range_decode_update (APEContext *ctx, int sy_f, int lt_f)
	Update decoding state.
static int	range_decode_bits (APEContext *ctx, int n)
	Decode n bits (n <= 16) without modelling.
static int	range_get_symbol (APEContext *ctx, const uint16_t counts[], const uint16_t counts_diff[])
	Decode symbol.

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 45 of file apedec.c.

MAX_BYTESPERSAMPLE

#define MAX_BYTESPERSAMPLE   3

Definition at line 46 of file apedec.c.

APE_FRAMECODE_MONO_SILENCE

#define APE_FRAMECODE_MONO_SILENCE   1

Definition at line 48 of file apedec.c.

APE_FRAMECODE_STEREO_SILENCE

#define APE_FRAMECODE_STEREO_SILENCE   3

Definition at line 49 of file apedec.c.

Referenced by ape_unpack_mono(), and ape_unpack_stereo().

APE_FRAMECODE_PSEUDO_STEREO

#define APE_FRAMECODE_PSEUDO_STEREO   4

Definition at line 50 of file apedec.c.

Referenced by ape_decode_frame().

HISTORY_SIZE

#define HISTORY_SIZE   512

Definition at line 52 of file apedec.c.

Referenced by ape_decode_init(), do_apply_filter(), init_filter(), lz4_decompress(), predictor_decode_mono_3800(), predictor_decode_mono_3930(), predictor_decode_mono_3950(), predictor_decode_stereo_3800(), predictor_decode_stereo_3930(), and predictor_decode_stereo_3950().

PREDICTOR_ORDER

#define PREDICTOR_ORDER   8

Definition at line 53 of file apedec.c.

PREDICTOR_SIZE

#define PREDICTOR_SIZE   50

Total size of all predictor histories.

Definition at line 55 of file apedec.c.

Referenced by init_predictor_decoder(), predictor_decode_mono_3800(), predictor_decode_mono_3930(), predictor_decode_mono_3950(), predictor_decode_stereo_3800(), predictor_decode_stereo_3930(), and predictor_decode_stereo_3950().

YDELAYA

#define YDELAYA   (18 + PREDICTOR_ORDER*4)

Definition at line 57 of file apedec.c.

Referenced by predictor_decode_mono_3800(), predictor_decode_mono_3930(), predictor_decode_mono_3950(), predictor_decode_stereo_3800(), predictor_decode_stereo_3930(), and predictor_decode_stereo_3950().

YDELAYB

#define YDELAYB   (18 + PREDICTOR_ORDER*3)

Definition at line 58 of file apedec.c.

Referenced by predictor_decode_mono_3800(), predictor_decode_stereo_3800(), and predictor_decode_stereo_3950().

XDELAYA

#define XDELAYA   (18 + PREDICTOR_ORDER*2)

Definition at line 59 of file apedec.c.

Referenced by predictor_decode_stereo_3800(), predictor_decode_stereo_3930(), and predictor_decode_stereo_3950().

XDELAYB

#define XDELAYB   (18 + PREDICTOR_ORDER)

Definition at line 60 of file apedec.c.

Referenced by predictor_decode_stereo_3800(), and predictor_decode_stereo_3950().

YADAPTCOEFFSA

#define YADAPTCOEFFSA   18

Definition at line 62 of file apedec.c.

Referenced by predictor_decode_mono_3950(), and predictor_decode_stereo_3950().

XADAPTCOEFFSA

#define XADAPTCOEFFSA   14

Definition at line 63 of file apedec.c.

Referenced by predictor_decode_stereo_3950().

YADAPTCOEFFSB

#define YADAPTCOEFFSB   10

Definition at line 64 of file apedec.c.

Referenced by predictor_decode_stereo_3950().

XADAPTCOEFFSB

#define XADAPTCOEFFSB   5

Definition at line 65 of file apedec.c.

Referenced by predictor_decode_stereo_3950().

APE_FILTER_LEVELS

#define APE_FILTER_LEVELS   3

Definition at line 80 of file apedec.c.

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

CODE_BITS

#define CODE_BITS   32

Definition at line 338 of file apedec.c.

TOP_VALUE

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

Definition at line 339 of file apedec.c.

Referenced by ff_bgmc_decode_init().

SHIFT_BITS

#define SHIFT_BITS   (CODE_BITS - 9)

Definition at line 340 of file apedec.c.

EXTRA_BITS

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

Definition at line 341 of file apedec.c.

Referenced by range_start_decoding().

BOTTOM_VALUE

#define BOTTOM_VALUE   (TOP_VALUE >> 8)

Definition at line 342 of file apedec.c.

Referenced by range_dec_normalize().

MODEL_ELEMENTS

#define MODEL_ELEMENTS   64

Definition at line 415 of file apedec.c.

Referenced by ape_decode_value_3900(), and ape_decode_value_3990().

OFFSET

#define OFFSET

(

x

)

Value:

offsetof(APEContext, x)

Definition at line 1739 of file apedec.c.

PAR

#define PAR   (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM)

Definition at line 1740 of file apedec.c.

Referenced by fade_gain().

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 71 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 1454 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 677 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 683 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 691 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 699 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 711 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 719 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 735 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 746 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 754 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 1065 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 1010 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 1168 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 1140 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 1317 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 1245 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 223 of file apedec.c.

ape_decode_init()

static av_cold int ape_decode_init ( AVCodecContext * avctx )

static

Definition at line 239 of file apedec.c.

range_start_decoding()

static void range_start_decoding ( APEContext * ctx )

inlinestatic

Start the decoder.

Definition at line 345 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 353 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 374 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 386 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 400 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 407 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 459 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 483 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 494 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 506 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 539 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 573 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 614 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 619 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 765 of file apedec.c.

Referenced by init_frame_decoder().

init_predictor_decoder()

static void init_predictor_decoder ( APEContext * ctx )

static

Definition at line 823 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 874 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 878 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 904 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 949 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 989 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 1110 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 ( APEPredictor64 * p, const int decoded, const int filter, const int delayA, const int delayB, const int adaptA, const int adaptB, int interim_mode )

static

Definition at line 1190 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 1365 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 1377 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 1383 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 1445 of file apedec.c.

Referenced by ape_apply_filters().

init_frame_decoder()

static int init_frame_decoder ( APEContext * ctx )

static

Definition at line 1468 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 1484 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 1505 of file apedec.c.

Referenced by ape_decode_frame().

ape_decode_frame()

static int ape_decode_frame ( AVCodecContext * avctx, AVFrame * frame, int * got_frame_ptr, AVPacket * avpkt )

static

Definition at line 1534 of file apedec.c.

ape_flush()

static av_cold void ape_flush ( AVCodecContext * avctx )

static

Definition at line 1733 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 83 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 92 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 420 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 429 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 438 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 447 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 803 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 807 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 811 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 815 of file apedec.c.

Referenced by init_predictor_decoder().

initial_coeffs_3930_64bit

const int64_t initial_coeffs_3930_64bit[4]

static

Initial value:

= {
    360, 317, -109, 98
}

Definition at line 819 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, .unit = "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, .unit = "max_samples" },
    { NULL},
}

Definition at line 1741 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 1747 of file apedec.c.

ff_ape_decoder

const FFCodec ff_ape_decoder

Initial value:

= {
    .p.name         = "ape",
    CODEC_LONG_NAME("Monkey's Audio"),
    .p.type         = AVMEDIA_TYPE_AUDIO,
    .p.id           = AV_CODEC_ID_APE,
    .priv_data_size = sizeof(APEContext),
    .init           = ape_decode_init,
    .close          = ape_decode_close,
    FF_CODEC_DECODE_CB(ape_decode_frame),
    .p.capabilities = AV_CODEC_CAP_DELAY |
                      AV_CODEC_CAP_DR1,
    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
    .flush          = ape_flush,
    .p.priv_class   = &ape_decoder_class,
}

Definition at line 1754 of file apedec.c.