libavcodec/wavpack.c File Reference

WavPack lossless audio decoder. More...

#include "libavutil/audioconvert.h"
#include "avcodec.h"
#include "get_bits.h"
#include "unary.h"

Go to the source code of this file.

Data Structures
struct	SavedContext
struct	Decorr
struct	WvChannel
struct	WavpackFrameContext
struct	WavpackContext
Defines
#define	BITSTREAM_READER_LE
#define	WV_MONO   0x00000004
#define	WV_JOINT_STEREO   0x00000010
#define	WV_FALSE_STEREO   0x40000000
#define	WV_HYBRID_MODE   0x00000008
#define	WV_HYBRID_SHAPE   0x00000008
#define	WV_HYBRID_BITRATE   0x00000200
#define	WV_HYBRID_BALANCE   0x00000400
#define	WV_FLT_SHIFT_ONES   0x01
#define	WV_FLT_SHIFT_SAME   0x02
#define	WV_FLT_SHIFT_SENT   0x04
#define	WV_FLT_ZERO_SENT   0x08
#define	WV_FLT_ZERO_SIGN   0x10
#define	MAX_TERMS   16
#define	WV_MAX_FRAME_DECODERS   14
#define	LEVEL_DECAY(a)   ((a + 0x80) >> 8)
#define	GET_MED(n)   ((c->median[n] >> 4) + 1)
#define	DEC_MED(n)   c->median[n] -= ((c->median[n] + (128 >> n) - 2) / (128 >> n)) * 2
#define	INC_MED(n)   c->median[n] += ((c->median[n] + (128 >> n) ) / (128 >> n)) * 5
#define	UPDATE_WEIGHT_CLIP(weight, delta, samples, in)
Enumerations
enum	WP_ID_Flags { WP_IDF_MASK = 0x1F, WP_IDF_IGNORE = 0x20, WP_IDF_ODD = 0x40, WP_IDF_LONG = 0x80 }
enum	WP_ID {   WP_ID_DUMMY = 0, WP_ID_ENCINFO, WP_ID_DECTERMS, WP_ID_DECWEIGHTS,   WP_ID_DECSAMPLES, WP_ID_ENTROPY, WP_ID_HYBRID, WP_ID_SHAPING,   WP_ID_FLOATINFO, WP_ID_INT32INFO, WP_ID_DATA, WP_ID_CORR,   WP_ID_EXTRABITS, WP_ID_CHANINFO }
Functions
static av_always_inline int	wp_exp2 (int16_t val)
static av_always_inline int	wp_log2 (int32_t val)
static av_always_inline int	get_tail (GetBitContext *gb, int k)
static void	update_error_limit (WavpackFrameContext *ctx)
static int	wv_get_value (WavpackFrameContext *ctx, GetBitContext *gb, int channel, int *last)
static int	wv_get_value_integer (WavpackFrameContext *s, uint32_t *crc, int S)
static float	wv_get_value_float (WavpackFrameContext *s, uint32_t *crc, int S)
static void	wv_reset_saved_context (WavpackFrameContext *s)
static int	wv_check_crc (WavpackFrameContext *s, uint32_t crc, uint32_t crc_extra_bits)
static int	wv_unpack_stereo (WavpackFrameContext *s, GetBitContext *gb, void *dst, const int type)
static int	wv_unpack_mono (WavpackFrameContext *s, GetBitContext *gb, void *dst, const int type)
static av_cold int	wv_alloc_frame_context (WavpackContext *c)
static av_cold int	wavpack_decode_init (AVCodecContext *avctx)
static av_cold int	wavpack_decode_end (AVCodecContext *avctx)
static int	wavpack_decode_block (AVCodecContext *avctx, int block_no, void *data, int *got_frame_ptr, const uint8_t *buf, int buf_size)
static void	wavpack_decode_flush (AVCodecContext *avctx)
static int	wavpack_decode_frame (AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
Variables
static const uint8_t	wp_exp2_table [256]
static const uint8_t	wp_log2_table []
AVCodec	ff_wavpack_decoder

---

Detailed Description

WavPack lossless audio decoder.

Definition in file wavpack.c.

---

Define Documentation

#define BITSTREAM_READER_LE

Definition at line 22 of file wavpack.c.

#define DEC_MED

(

n

)

c->median[n] -= ((c->median[n] + (128 >> n) - 2) / (128 >> n)) * 2

Definition at line 215 of file wavpack.c.

Referenced by wv_get_value().

#define GET_MED

(

n

)

((c->median[n] >> 4) + 1)

Definition at line 214 of file wavpack.c.

Referenced by wv_get_value().

#define INC_MED

(

n

)

c->median[n] += ((c->median[n] + (128 >> n) ) / (128 >> n)) * 5

Definition at line 216 of file wavpack.c.

Referenced by wv_get_value().

#define LEVEL_DECAY

(

a

)

((a + 0x80) >> 8)

Definition at line 211 of file wavpack.c.

Referenced by update_error_limit(), and wv_get_value().

#define MAX_TERMS   16

Definition at line 80 of file wavpack.c.

Referenced by wavpack_decode_block().

#define UPDATE_WEIGHT_CLIP	(	weight,
		delta,
		samples,
		in		)

Value:

if (samples && in) { \
        if ((samples ^ in) < 0) { \
            weight -= delta; \
            if (weight < -1024) \
                weight = -1024; \
        } else { \
            weight += delta; \
            if (weight > 1024) \
                weight = 1024; \
        } \
    }

Definition at line 219 of file wavpack.c.

Referenced by wv_unpack_stereo().

#define WV_FALSE_STEREO   0x40000000

Definition at line 36 of file wavpack.c.

Referenced by wavpack_decode_block().

#define WV_FLT_SHIFT_ONES   0x01

Definition at line 43 of file wavpack.c.

Referenced by wv_get_value_float().

#define WV_FLT_SHIFT_SAME   0x02

Definition at line 44 of file wavpack.c.

Referenced by wv_get_value_float().

#define WV_FLT_SHIFT_SENT   0x04

Definition at line 45 of file wavpack.c.

Referenced by wv_get_value_float().

#define WV_FLT_ZERO_SENT   0x08

Definition at line 46 of file wavpack.c.

Referenced by wv_get_value_float().

#define WV_FLT_ZERO_SIGN   0x10

Definition at line 47 of file wavpack.c.

Referenced by wv_get_value_float().

#define WV_HYBRID_BALANCE   0x00000400

Definition at line 41 of file wavpack.c.

#define WV_HYBRID_BITRATE   0x00000200

Definition at line 40 of file wavpack.c.

Referenced by wavpack_decode_block().

#define WV_HYBRID_MODE   0x00000008

Definition at line 38 of file wavpack.c.

Referenced by wavpack_decode_block().

#define WV_HYBRID_SHAPE   0x00000008

Definition at line 39 of file wavpack.c.

#define WV_JOINT_STEREO   0x00000010

Definition at line 35 of file wavpack.c.

Referenced by wavpack_decode_block().

#define WV_MAX_FRAME_DECODERS   14

Definition at line 125 of file wavpack.c.

Referenced by wv_alloc_frame_context().

#define WV_MONO   0x00000004

Definition at line 34 of file wavpack.c.

Referenced by wavpack_decode_block(), and wv_read_block_header().

---

Enumeration Type Documentation

enum WP_ID

Enumerator:

WP_ID_DUMMY
WP_ID_ENCINFO
WP_ID_DECTERMS
WP_ID_DECWEIGHTS
WP_ID_DECSAMPLES
WP_ID_ENTROPY
WP_ID_HYBRID
WP_ID_SHAPING
WP_ID_FLOATINFO
WP_ID_INT32INFO
WP_ID_DATA
WP_ID_CORR
WP_ID_EXTRABITS
WP_ID_CHANINFO

Definition at line 56 of file wavpack.c.

enum WP_ID_Flags

Enumerator:

WP_IDF_MASK
WP_IDF_IGNORE
WP_IDF_ODD
WP_IDF_LONG

Definition at line 49 of file wavpack.c.

---

Function Documentation

static av_always_inline int get_tail	(	GetBitContext *	gb,
		int	k
	)			[static]

Definition at line 233 of file wavpack.c.

Referenced by wv_get_value().

static void update_error_limit

(

WavpackFrameContext *

ctx

)

[static]

Definition at line 247 of file wavpack.c.

Referenced by wv_get_value().

static int wavpack_decode_block	(	AVCodecContext *	avctx,
		int	block_no,
		void *	data,
		int *	got_frame_ptr,
		const uint8_t *	buf,
		int	buf_size
	)			[static]

Definition at line 759 of file wavpack.c.

Referenced by wavpack_decode_frame().

static av_cold int wavpack_decode_end

(

AVCodecContext *

avctx

)

[static]

Definition at line 747 of file wavpack.c.

static void wavpack_decode_flush

(

AVCodecContext *

avctx

)

[static]

Definition at line 1159 of file wavpack.c.

Referenced by wavpack_decode_frame().

static int wavpack_decode_frame	(	AVCodecContext *	avctx,
		void *	data,
		int *	got_frame_ptr,
		AVPacket *	avpkt
	)			[static]

Definition at line 1168 of file wavpack.c.

static av_cold int wavpack_decode_init

(

AVCodecContext *

avctx

)

[static]

Definition at line 716 of file wavpack.c.

static av_always_inline int wp_exp2

(

int16_t

val

)

[static]

Definition at line 180 of file wavpack.c.

Referenced by update_error_limit(), and wavpack_decode_block().

static av_always_inline int wp_log2

(

int32_t

val

)

[static]

Definition at line 195 of file wavpack.c.

Referenced by wv_get_value().

static av_cold int wv_alloc_frame_context

(

WavpackContext *

c

)

[static]

Definition at line 700 of file wavpack.c.

Referenced by wavpack_decode_block().

static int wv_check_crc	(	WavpackFrameContext *	s,
		uint32_t	crc,
		uint32_t	crc_extra_bits
	)			[inline, static]

Definition at line 503 of file wavpack.c.

Referenced by wv_unpack_mono(), and wv_unpack_stereo().

static int wv_get_value	(	WavpackFrameContext *	ctx,
		GetBitContext *	gb,
		int	channel,
		int *	last
	)			[static]

Definition at line 281 of file wavpack.c.

Referenced by wv_unpack_mono(), and wv_unpack_stereo().

static float wv_get_value_float	(	WavpackFrameContext *	s,
		uint32_t *	crc,
		int	S
	)			[static]

Definition at line 424 of file wavpack.c.

Referenced by wv_unpack_mono(), and wv_unpack_stereo().

static int wv_get_value_integer	(	WavpackFrameContext *	s,
		uint32_t *	crc,
		int	S
	)			[inline, static]

Definition at line 401 of file wavpack.c.

Referenced by wv_unpack_mono(), and wv_unpack_stereo().

static void wv_reset_saved_context

(

WavpackFrameContext *

s

)

[static]

Definition at line 497 of file wavpack.c.

Referenced by wavpack_decode_flush(), wv_alloc_frame_context(), wv_unpack_mono(), and wv_unpack_stereo().

static int wv_unpack_mono	(	WavpackFrameContext *	s,
		GetBitContext *	gb,
		void *	dst,
		const int	type
	)			[inline, static]

Definition at line 635 of file wavpack.c.

Referenced by wavpack_decode_block().

static int wv_unpack_stereo	(	WavpackFrameContext *	s,
		GetBitContext *	gb,
		void *	dst,
		const int	type
	)			[inline, static]

Definition at line 518 of file wavpack.c.

Referenced by wavpack_decode_block().

---

Variable Documentation

AVCodec ff_wavpack_decoder

Initial value:

 {
    .name           = "wavpack",
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = AV_CODEC_ID_WAVPACK,
    .priv_data_size = sizeof(WavpackContext),
    .init           = wavpack_decode_init,
    .close          = wavpack_decode_end,
    .decode         = wavpack_decode_frame,
    .flush          = wavpack_decode_flush,
    .capabilities   = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1,
    .long_name      = NULL_IF_CONFIG_SMALL("WavPack"),
}

Definition at line 1249 of file wavpack.c.

const uint8_t wp_exp2_table[256] [static]

Initial value:

 {
    0x00, 0x01, 0x01, 0x02, 0x03, 0x03, 0x04, 0x05, 0x06, 0x06, 0x07, 0x08, 0x08, 0x09, 0x0a, 0x0b,
    0x0b, 0x0c, 0x0d, 0x0e, 0x0e, 0x0f, 0x10, 0x10, 0x11, 0x12, 0x13, 0x13, 0x14, 0x15, 0x16, 0x16,
    0x17, 0x18, 0x19, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1d, 0x1e, 0x1f, 0x20, 0x20, 0x21, 0x22, 0x23,
    0x24, 0x24, 0x25, 0x26, 0x27, 0x28, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
    0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3a, 0x3b, 0x3c, 0x3d,
    0x3e, 0x3f, 0x40, 0x41, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x48, 0x49, 0x4a, 0x4b,
    0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a,
    0x5b, 0x5c, 0x5d, 0x5e, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
    0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
    0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x87, 0x88, 0x89, 0x8a,
    0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b,
    0x9c, 0x9d, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad,
    0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0,
    0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc8, 0xc9, 0xca, 0xcb, 0xcd, 0xce, 0xcf, 0xd0, 0xd2, 0xd3, 0xd4,
    0xd6, 0xd7, 0xd8, 0xd9, 0xdb, 0xdc, 0xdd, 0xde, 0xe0, 0xe1, 0xe2, 0xe4, 0xe5, 0xe6, 0xe8, 0xe9,
    0xea, 0xec, 0xed, 0xee, 0xf0, 0xf1, 0xf2, 0xf4, 0xf5, 0xf6, 0xf8, 0xf9, 0xfa, 0xfc, 0xfd, 0xff
}

Definition at line 142 of file wavpack.c.

Referenced by wp_exp2().

const uint8_t wp_log2_table[] [static]

Initial value:

 {
    0x00, 0x01, 0x03, 0x04, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0d, 0x0e, 0x10, 0x11, 0x12, 0x14, 0x15,
    0x16, 0x18, 0x19, 0x1a, 0x1c, 0x1d, 0x1e, 0x20, 0x21, 0x22, 0x24, 0x25, 0x26, 0x28, 0x29, 0x2a,
    0x2c, 0x2d, 0x2e, 0x2f, 0x31, 0x32, 0x33, 0x34, 0x36, 0x37, 0x38, 0x39, 0x3b, 0x3c, 0x3d, 0x3e,
    0x3f, 0x41, 0x42, 0x43, 0x44, 0x45, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4d, 0x4e, 0x4f, 0x50, 0x51,
    0x52, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63,
    0x64, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x74, 0x75,
    0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85,
    0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95,
    0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4,
    0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb2,
    0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0xc0,
    0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcb, 0xcc, 0xcd, 0xce,
    0xcf, 0xd0, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd8, 0xd9, 0xda, 0xdb,
    0xdc, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe4, 0xe5, 0xe6, 0xe7, 0xe7,
    0xe8, 0xe9, 0xea, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xee, 0xef, 0xf0, 0xf1, 0xf1, 0xf2, 0xf3, 0xf4,
    0xf4, 0xf5, 0xf6, 0xf7, 0xf7, 0xf8, 0xf9, 0xf9, 0xfa, 0xfb, 0xfc, 0xfc, 0xfd, 0xfe, 0xff, 0xff
}

Definition at line 161 of file wavpack.c.

Referenced by wp_log2().