libavcodec/shorten.c File Reference

Shorten decoder. More...

#include <limits.h>
#include "avcodec.h"
#include "get_bits.h"
#include "golomb.h"

Go to the source code of this file.

Data Structures
struct	ShortenContext
Defines
#define	MAX_CHANNELS   8
#define	MAX_BLOCKSIZE   65535
#define	OUT_BUFFER_SIZE   16384
#define	ULONGSIZE   2
#define	WAVE_FORMAT_PCM   0x0001
#define	DEFAULT_BLOCK_SIZE   256
#define	TYPESIZE   4
#define	CHANSIZE   0
#define	LPCQSIZE   2
#define	ENERGYSIZE   3
#define	BITSHIFTSIZE   2
#define	TYPE_S16HL   3
#define	TYPE_S16LH   5
#define	NWRAP   3
#define	NSKIPSIZE   1
#define	LPCQUANT   5
#define	V2LPCQOFFSET   (1 << LPCQUANT)
#define	FNSIZE   2
#define	FN_DIFF0   0
#define	FN_DIFF1   1
#define	FN_DIFF2   2
#define	FN_DIFF3   3
#define	FN_QUIT   4
#define	FN_BLOCKSIZE   5
#define	FN_BITSHIFT   6
#define	FN_QLPC   7
#define	FN_ZERO   8
#define	FN_VERBATIM   9
#define	VERBATIM_CKSIZE_SIZE   5
#define	VERBATIM_BYTE_SIZE   8
#define	CANONICAL_HEADER_SIZE   44
Functions
static av_cold int	shorten_decode_init (AVCodecContext *avctx)
static int	allocate_buffers (ShortenContext *s)
static unsigned int	get_uint (ShortenContext *s, int k)
static void	fix_bitshift (ShortenContext *s, int32_t *buffer)
static void	init_offset (ShortenContext *s)
static int	get_le32 (GetBitContext *gb)
static short	get_le16 (GetBitContext *gb)
static int	decode_wave_header (AVCodecContext *avctx, uint8_t *header, int header_size)
static int16_t *	interleave_buffer (int16_t *samples, int nchan, int blocksize, int32_t **buffer)
static void	decode_subframe_lpc (ShortenContext *s, int channel, int residual_size, int pred_order)
static int	shorten_decode_frame (AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
static av_cold int	shorten_decode_close (AVCodecContext *avctx)
static void	shorten_flush (AVCodecContext *avctx)
Variables
AVCodec	ff_shorten_decoder

---

Detailed Description

Shorten decoder.

Author:

Jeff Muizelaar

Definition in file shorten.c.

---

Define Documentation

#define BITSHIFTSIZE   2

Definition at line 49 of file shorten.c.

Referenced by shorten_decode_frame().

#define CANONICAL_HEADER_SIZE   44

Definition at line 74 of file shorten.c.

Referenced by shorten_decode_frame().

#define CHANSIZE   0

Definition at line 46 of file shorten.c.

Referenced by shorten_decode_frame().

#define DEFAULT_BLOCK_SIZE   256

Definition at line 43 of file shorten.c.

Referenced by shorten_decode_frame().

#define ENERGYSIZE   3

Definition at line 48 of file shorten.c.

Referenced by shorten_decode_frame().

#define FN_BITSHIFT   6

Definition at line 67 of file shorten.c.

Referenced by shorten_decode_frame().

#define FN_BLOCKSIZE   5

Definition at line 66 of file shorten.c.

Referenced by shorten_decode_frame().

#define FN_DIFF0   0

Definition at line 61 of file shorten.c.

Referenced by shorten_decode_frame().

#define FN_DIFF1   1

Definition at line 62 of file shorten.c.

Referenced by shorten_decode_frame().

#define FN_DIFF2   2

Definition at line 63 of file shorten.c.

Referenced by shorten_decode_frame().

#define FN_DIFF3   3

Definition at line 64 of file shorten.c.

Referenced by shorten_decode_frame().

#define FN_QLPC   7

Definition at line 68 of file shorten.c.

Referenced by shorten_decode_frame().

#define FN_QUIT   4

Definition at line 65 of file shorten.c.

Referenced by shorten_decode_frame().

#define FN_VERBATIM   9

Definition at line 70 of file shorten.c.

Referenced by shorten_decode_frame().

#define FN_ZERO   8

Definition at line 69 of file shorten.c.

Referenced by shorten_decode_frame().

#define FNSIZE   2

Definition at line 60 of file shorten.c.

Referenced by shorten_decode_frame().

#define LPCQSIZE   2

Definition at line 47 of file shorten.c.

Referenced by shorten_decode_frame().

#define LPCQUANT   5

Definition at line 57 of file shorten.c.

Referenced by decode_subframe_lpc().

#define MAX_BLOCKSIZE   65535

Definition at line 35 of file shorten.c.

#define MAX_CHANNELS   8

Definition at line 34 of file shorten.c.

#define NSKIPSIZE   1

Definition at line 55 of file shorten.c.

Referenced by shorten_decode_frame().

#define NWRAP   3

Definition at line 54 of file shorten.c.

Referenced by shorten_decode_frame().

#define OUT_BUFFER_SIZE   16384

Definition at line 37 of file shorten.c.

Referenced by shorten_decode_frame().

#define TYPE_S16HL   3

Definition at line 51 of file shorten.c.

Referenced by init_offset().

#define TYPE_S16LH   5

Definition at line 52 of file shorten.c.

Referenced by init_offset().

#define TYPESIZE   4

Definition at line 45 of file shorten.c.

Referenced by shorten_decode_frame().

#define ULONGSIZE   2

Definition at line 39 of file shorten.c.

Referenced by get_uint().

#define V2LPCQOFFSET   (1 << LPCQUANT)

Definition at line 58 of file shorten.c.

Referenced by shorten_decode_frame().

#define VERBATIM_BYTE_SIZE   8

Definition at line 73 of file shorten.c.

Referenced by shorten_decode_frame().

#define VERBATIM_CKSIZE_SIZE   5

Definition at line 72 of file shorten.c.

Referenced by shorten_decode_frame().

#define WAVE_FORMAT_PCM   0x0001

Definition at line 41 of file shorten.c.

Referenced by decode_wave_header().

---

Function Documentation

static int allocate_buffers

(

ShortenContext *

s

)

[static]

Definition at line 113 of file shorten.c.

static void decode_subframe_lpc	(	ShortenContext *	s,
		int	channel,
		int	residual_size,
		int	pred_order
	)			[static]

Definition at line 269 of file shorten.c.

static int decode_wave_header	(	AVCodecContext *	avctx,
		uint8_t *	header,
		int	header_size
	)			[static]

Definition at line 203 of file shorten.c.

Referenced by shorten_decode_frame().

static void fix_bitshift	(	ShortenContext *	s,
		int32_t *	buffer
	)			[static]

Definition at line 161 of file shorten.c.

Referenced by shorten_decode_frame().

static short get_le16

(

GetBitContext *

gb

)

[inline, static]

Definition at line 198 of file shorten.c.

Referenced by decode_wave_header().

static int get_le32

(

GetBitContext *

gb

)

[inline, static]

Definition at line 193 of file shorten.c.

Referenced by decode_wave_header().

static unsigned int get_uint	(	ShortenContext *	s,
		int	k
	)			[inline, static]

Definition at line 153 of file shorten.c.

Referenced by shorten_decode_frame().

static void init_offset

(

ShortenContext *

s

)

[static]

Definition at line 171 of file shorten.c.

Referenced by shorten_decode_frame().

static int16_t* interleave_buffer	(	int16_t *	samples,
		int	nchan,
		int	blocksize,
		int32_t **	buffer
	)			[static]

Definition at line 261 of file shorten.c.

Referenced by shorten_decode_frame().

static av_cold int shorten_decode_close

(

AVCodecContext *

avctx

)

[static]

Definition at line 547 of file shorten.c.

static int shorten_decode_frame	(	AVCodecContext *	avctx,
		void *	data,
		int *	data_size,
		AVPacket *	avpkt
	)			[static]

Definition at line 286 of file shorten.c.

static av_cold int shorten_decode_init

(

AVCodecContext *

avctx

)

[static]

Definition at line 104 of file shorten.c.

static void shorten_flush

(

AVCodecContext *

avctx

)

[static]

Definition at line 562 of file shorten.c.

---

Variable Documentation

AVCodec ff_shorten_decoder

Initial value:

 {
    "shorten",
    AVMEDIA_TYPE_AUDIO,
    CODEC_ID_SHORTEN,
    sizeof(ShortenContext),
    shorten_decode_init,
    NULL,
    shorten_decode_close,
    shorten_decode_frame,
    .flush= shorten_flush,
    .long_name= NULL_IF_CONFIG_SMALL("Shorten"),
}

Definition at line 569 of file shorten.c.