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

#include <inttypes.h>
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.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"

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.

#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 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 int 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.

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 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.

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 culmulative 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

#define MAX_CHANNELS 2

Definition at line 41 of file apedec.c.

#define MAX_BYTESPERSAMPLE 3

Definition at line 42 of file apedec.c.

#define APE_FRAMECODE_MONO_SILENCE 1

Definition at line 44 of file apedec.c.

#define APE_FRAMECODE_STEREO_SILENCE 3

Definition at line 45 of file apedec.c.

Referenced by ape_unpack_mono(), and ape_unpack_stereo().

#define APE_FRAMECODE_PSEUDO_STEREO 4

Definition at line 46 of file apedec.c.

Referenced by ape_decode_frame().

#define HISTORY_SIZE 512

Definition at line 48 of file apedec.c.

Referenced by ape_decode_init(), do_apply_filter(), init_filter(), 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().

#define PREDICTOR_ORDER 8

Definition at line 49 of file apedec.c.

#define PREDICTOR_SIZE 50

Total size of all predictor histories.

Definition at line 51 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().

#define YDELAYA (18 + PREDICTOR_ORDER*4)

Definition at line 53 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().

#define YDELAYB (18 + PREDICTOR_ORDER*3)

Definition at line 54 of file apedec.c.

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

#define XDELAYA (18 + PREDICTOR_ORDER*2)

Definition at line 55 of file apedec.c.

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

#define XDELAYB (18 + PREDICTOR_ORDER)

Definition at line 56 of file apedec.c.

Referenced by predictor_decode_stereo_3800(), and predictor_decode_stereo_3950().

#define YADAPTCOEFFSA 18

Definition at line 58 of file apedec.c.

Referenced by predictor_decode_mono_3950(), and predictor_decode_stereo_3950().

#define XADAPTCOEFFSA 14

Definition at line 59 of file apedec.c.

Referenced by predictor_decode_stereo_3950().

#define YADAPTCOEFFSB 10

Definition at line 60 of file apedec.c.

Referenced by predictor_decode_stereo_3950().

#define XADAPTCOEFFSB 5

Definition at line 61 of file apedec.c.

Referenced by predictor_decode_stereo_3950().

#define APE_FILTER_LEVELS 3

Definition at line 76 of file apedec.c.

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

#define CODE_BITS 32

Definition at line 311 of file apedec.c.

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

Definition at line 312 of file apedec.c.

#define SHIFT_BITS (CODE_BITS - 9)

Definition at line 313 of file apedec.c.

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

Definition at line 314 of file apedec.c.

Referenced by range_start_decoding().

#define BOTTOM_VALUE (TOP_VALUE >> 8)

Definition at line 315 of file apedec.c.

Referenced by range_dec_normalize().

#define MODEL_ELEMENTS 64

Definition at line 388 of file apedec.c.

Referenced by ape_decode_value_3900(), and ape_decode_value_3990().

#define OFFSET ( x ) offsetof(APEContext, x)

Definition at line 1549 of file apedec.c.

#define PAR (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM)

Definition at line 1550 of file apedec.c.

Enumeration Type Documentation

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 67 of file apedec.c.

Function Documentation

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

static

Definition at line 1317 of file apedec.c.

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

static void entropy_decode_mono_0000	(	APEContext *	ctx,
		int	blockstodecode
	)

static

Definition at line 632 of file apedec.c.

Referenced by ape_decode_init().

static void entropy_decode_stereo_0000	(	APEContext *	ctx,
		int	blockstodecode
	)

static

Definition at line 638 of file apedec.c.

Referenced by ape_decode_init().

static void entropy_decode_mono_3860	(	APEContext *	ctx,
		int	blockstodecode
	)

static

Definition at line 646 of file apedec.c.

Referenced by ape_decode_init().

static void entropy_decode_stereo_3860	(	APEContext *	ctx,
		int	blockstodecode
	)

static

Definition at line 654 of file apedec.c.

Referenced by ape_decode_init().

static void entropy_decode_mono_3900	(	APEContext *	ctx,
		int	blockstodecode
	)

static

Definition at line 666 of file apedec.c.

Referenced by ape_decode_init().

static void entropy_decode_stereo_3900	(	APEContext *	ctx,
		int	blockstodecode
	)

static

Definition at line 674 of file apedec.c.

Referenced by ape_decode_init().

static void entropy_decode_stereo_3930	(	APEContext *	ctx,
		int	blockstodecode
	)

static

Definition at line 690 of file apedec.c.

Referenced by ape_decode_init().

static void entropy_decode_mono_3990	(	APEContext *	ctx,
		int	blockstodecode
	)

static

Definition at line 701 of file apedec.c.

Referenced by ape_decode_init().

static void entropy_decode_stereo_3990	(	APEContext *	ctx,
		int	blockstodecode
	)

static

Definition at line 709 of file apedec.c.

Referenced by ape_decode_init().

static void predictor_decode_mono_3800	(	APEContext *	ctx,
		int	count
	)

static

Definition at line 987 of file apedec.c.

Referenced by ape_decode_init().

static void predictor_decode_stereo_3800	(	APEContext *	ctx,
		int	count
	)

static

Definition at line 932 of file apedec.c.

Referenced by ape_decode_init().

static void predictor_decode_mono_3930	(	APEContext *	ctx,
		int	count
	)

static

Definition at line 1090 of file apedec.c.

Referenced by ape_decode_init().

static void predictor_decode_stereo_3930	(	APEContext *	ctx,
		int	count
	)

static

Definition at line 1062 of file apedec.c.

Referenced by ape_decode_init().

static void predictor_decode_mono_3950	(	APEContext *	ctx,
		int	count
	)

static

Definition at line 1188 of file apedec.c.

Referenced by ape_decode_init().

static void predictor_decode_stereo_3950	(	APEContext *	ctx,
		int	count
	)

static

Definition at line 1159 of file apedec.c.

Referenced by ape_decode_init().

static av_cold int ape_decode_close ( AVCodecContext * avctx )

static

Definition at line 200 of file apedec.c.

Referenced by ape_decode_init().

static av_cold int ape_decode_init ( AVCodecContext * avctx )

static

Definition at line 215 of file apedec.c.

static void range_start_decoding ( APEContext * ctx )

inlinestatic

Start the decoder.

Definition at line 318 of file apedec.c.

Referenced by entropy_decode_stereo_3900(), and init_entropy_decoder().

static void range_dec_normalize ( APEContext * ctx )

inlinestatic

Perform normalization.

Definition at line 326 of file apedec.c.

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

static int range_decode_culfreq	(	APEContext *	ctx,
		int	tot_f
	)

inlinestatic

Calculate culmulative frequency for next symbol.

Does NO update!

Parameters

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

Returns: the culmulative frequency

Definition at line 347 of file apedec.c.

Referenced by ape_decode_value_3990().

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 359 of file apedec.c.

Referenced by range_decode_bits(), and range_get_symbol().

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 373 of file apedec.c.

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

static int range_decode_bits	(	APEContext *	ctx,
		int	n
	)

inlinestatic

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

Definition at line 380 of file apedec.c.

Referenced by ape_decode_value_3900(), and ape_decode_value_3990().

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 432 of file apedec.c.

Referenced by ape_decode_value_3900(), and ape_decode_value_3990().

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

inlinestatic

Definition at line 456 of file apedec.c.

Referenced by ape_decode_value_3900(), and ape_decode_value_3990().

static int get_rice_ook	(	GetBitContext *	gb,
		int	k
	)

inlinestatic

Definition at line 467 of file apedec.c.

Referenced by decode_array_0000().

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

inlinestatic

Definition at line 479 of file apedec.c.

Referenced by entropy_decode_mono_3860(), and entropy_decode_stereo_3860().

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

inlinestatic

Definition at line 511 of file apedec.c.

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

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

inlinestatic

Definition at line 545 of file apedec.c.

Referenced by entropy_decode_mono_3990(), and entropy_decode_stereo_3990().

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

static

Definition at line 588 of file apedec.c.

Referenced by entropy_decode_mono_0000(), and entropy_decode_stereo_0000().

static int init_entropy_decoder ( APEContext * ctx )

static

Definition at line 720 of file apedec.c.

Referenced by init_frame_decoder().

static void init_predictor_decoder ( APEContext * ctx )

static

Definition at line 773 of file apedec.c.

Referenced by init_frame_decoder().

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 814 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().

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

static

Definition at line 818 of file apedec.c.

Referenced by predictor_decode_mono_3800(), and predictor_decode_stereo_3800().

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

static

Definition at line 844 of file apedec.c.

Referenced by predictor_decode_mono_3800(), and predictor_decode_stereo_3800().

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

static

Definition at line 889 of file apedec.c.

Referenced by predictor_decode_mono_3800(), and predictor_decode_stereo_3800().

static void long_filter_ehigh_3830	(	int32_t *	buffer,
		int	length
	)

static

Definition at line 912 of file apedec.c.

Referenced by predictor_decode_mono_3800(), and predictor_decode_stereo_3800().

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

static

Definition at line 1032 of file apedec.c.

Referenced by predictor_decode_mono_3930(), and predictor_decode_stereo_3930().

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 1112 of file apedec.c.

Referenced by predictor_decode_stereo_3950().

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

static

Definition at line 1236 of file apedec.c.

Referenced by init_filter().

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

static

Definition at line 1248 of file apedec.c.

Referenced by init_frame_decoder().

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

static

Definition at line 1254 of file apedec.c.

Referenced by 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 1308 of file apedec.c.

Referenced by ape_apply_filters().

static int init_frame_decoder ( APEContext * ctx )

static

Definition at line 1331 of file apedec.c.

Referenced by ape_decode_frame().

static void ape_unpack_mono	(	APEContext *	ctx,
		int	count
	)

static

Definition at line 1347 of file apedec.c.

Referenced by ape_decode_frame().

static void ape_unpack_stereo	(	APEContext *	ctx,
		int	count
	)

static

Definition at line 1366 of file apedec.c.

Referenced by ape_decode_frame().

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

static

Definition at line 1393 of file apedec.c.

static void ape_flush ( AVCodecContext * avctx )

static

Definition at line 1543 of file apedec.c.

Variable Documentation

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 79 of file apedec.c.

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

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 88 of file apedec.c.

Referenced by ape_apply_filters().

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 393 of file apedec.c.

Referenced by ape_decode_value_3900().

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 402 of file apedec.c.

Referenced by ape_decode_value_3900().

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 411 of file apedec.c.

Referenced by ape_decode_value_3990().

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 420 of file apedec.c.

Referenced by ape_decode_value_3990().

const int32_t initial_coeffs_fast_3320[1]

static

Initial value:

= {
    375,
}

Definition at line 757 of file apedec.c.

Referenced by init_predictor_decoder().

const int32_t initial_coeffs_a_3800[3]

static

Initial value:

= {
    64, 115, 64,
}

Definition at line 761 of file apedec.c.

Referenced by init_predictor_decoder().

const int32_t initial_coeffs_b_3800[2]

static

Initial value:

= {
    740, 0
}

Definition at line 765 of file apedec.c.

Referenced by init_predictor_decoder().

const int32_t initial_coeffs_3930[4]

static

Initial value:

= {
    360, 317, -109, 98
}

Definition at line 769 of file apedec.c.

Referenced by init_predictor_decoder().

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 1551 of file apedec.c.

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 1557 of file apedec.c.

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   = CODEC_CAP_SUBFRAMES | CODEC_CAP_DELAY | 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 1564 of file apedec.c.

Data Structures

Macros

Enumerations

Functions

Variables

APE range decoding functions

Detailed Description

Macro Definition Documentation

Enumeration Type Documentation

Function Documentation

Variable Documentation