Shorten decoder. More...

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

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
Typedefs
typedef struct ShortenContext	ShortenContext
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 int	init_offset (ShortenContext *s)
static int	decode_wave_header (AVCodecContext avctx, const uint8_t header, int header_size)
static void	interleave_buffer (int16_t samples, int nchan, int blocksize, int32_t *buffer)
static int	decode_subframe_lpc (ShortenContext *s, int command, int channel, int residual_size, int32_t coffset)
static int	read_header (ShortenContext *s)
static int	shorten_decode_frame (AVCodecContext avctx, void data, int got_frame_ptr, AVPacket avpkt)
static av_cold int	shorten_decode_close (AVCodecContext *avctx)
Variables
static const uint8_t	is_audio_command [10] = { 1, 1, 1, 1, 0, 0, 0, 1, 1, 0 }
	indicates if the FN_* command is audio or non-audio
static const int	fixed_coeffs [3][3]
AVCodec	ff_shorten_decoder

Detailed Description

Shorten decoder.

Author:: Jeff Muizelaar

Definition in file shorten.c.

Define Documentation

#define BITSHIFTSIZE 2

Definition at line 50 of file shorten.c.

Referenced by shorten_decode_frame().

#define CANONICAL_HEADER_SIZE 44

Definition at line 78 of file shorten.c.

Referenced by read_header().

#define CHANSIZE 0

Definition at line 47 of file shorten.c.

Referenced by read_header().

#define DEFAULT_BLOCK_SIZE 256

Definition at line 44 of file shorten.c.

Referenced by read_header().

#define ENERGYSIZE 3

Definition at line 49 of file shorten.c.

Referenced by shorten_decode_frame().

#define FN_BITSHIFT 6

Definition at line 68 of file shorten.c.

Referenced by shorten_decode_frame().

#define FN_BLOCKSIZE 5

Definition at line 67 of file shorten.c.

Referenced by shorten_decode_frame().

#define FN_DIFF0 0

Definition at line 62 of file shorten.c.

#define FN_DIFF1 1

Definition at line 63 of file shorten.c.

#define FN_DIFF2 2

Definition at line 64 of file shorten.c.

#define FN_DIFF3 3

Definition at line 65 of file shorten.c.

#define FN_QLPC 7

Definition at line 69 of file shorten.c.

Referenced by decode_subframe_lpc().

#define FN_QUIT 4

Definition at line 66 of file shorten.c.

Referenced by shorten_decode_frame().

#define FN_VERBATIM 9

Definition at line 71 of file shorten.c.

Referenced by read_header(), and shorten_decode_frame().

#define FN_ZERO 8

Definition at line 70 of file shorten.c.

Referenced by shorten_decode_frame().

#define FNSIZE 2

Definition at line 61 of file shorten.c.

Referenced by read_header(), and shorten_decode_frame().

#define LPCQSIZE 2

Definition at line 48 of file shorten.c.

Referenced by decode_subframe_lpc(), and read_header().

#define LPCQUANT 5

Definition at line 58 of file shorten.c.

Referenced by decode_subframe_lpc().

#define MAX_BLOCKSIZE 65535

Definition at line 36 of file shorten.c.

Referenced by read_header(), and shorten_decode_frame().

#define MAX_CHANNELS 8

Definition at line 35 of file shorten.c.

Referenced by read_header().

#define NSKIPSIZE 1

Definition at line 56 of file shorten.c.

Referenced by read_header().

#define NWRAP 3

Definition at line 55 of file shorten.c.

Referenced by read_header().

#define OUT_BUFFER_SIZE 16384

Definition at line 38 of file shorten.c.

Referenced by read_header().

#define TYPE_S16HL 3

Definition at line 52 of file shorten.c.

Referenced by init_offset().

#define TYPE_S16LH 5

Definition at line 53 of file shorten.c.

Referenced by init_offset().

#define TYPESIZE 4

Definition at line 46 of file shorten.c.

Referenced by read_header().

#define ULONGSIZE 2

Definition at line 40 of file shorten.c.

Referenced by get_uint().

#define V2LPCQOFFSET (1 << LPCQUANT)

Definition at line 59 of file shorten.c.

#define VERBATIM_BYTE_SIZE 8

Definition at line 77 of file shorten.c.

Referenced by read_header(), and shorten_decode_frame().

#define VERBATIM_CKSIZE_SIZE 5

Definition at line 76 of file shorten.c.

Referenced by read_header(), and shorten_decode_frame().

#define WAVE_FORMAT_PCM 0x0001

Definition at line 42 of file shorten.c.

Referenced by decode_wave_header().

Typedef Documentation

typedef struct ShortenContext ShortenContext

Function Documentation

static int allocate_buffers ( ShortenContext * s ) [static]

Definition at line 123 of file shorten.c.

Referenced by read_header().

static int decode_subframe_lpc	(	ShortenContext *	s,
		int	command,
		int	channel,
		int	residual_size,
		int32_t	coffset
	)			`[static]`

Definition at line 275 of file shorten.c.

Referenced by shorten_decode_frame().

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

Definition at line 203 of file shorten.c.

Referenced by read_header().

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

Definition at line 172 of file shorten.c.

Referenced by shorten_decode_frame().

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

Definition at line 165 of file shorten.c.

Referenced by read_header(), and shorten_decode_frame().

static int init_offset ( ShortenContext * s ) [static]

Definition at line 181 of file shorten.c.

Referenced by read_header().

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

Definition at line 260 of file shorten.c.

Referenced by shorten_decode_frame().

static int read_header ( ShortenContext * s ) [static]

Definition at line 325 of file shorten.c.

Referenced by shorten_decode_frame().

static av_cold int shorten_decode_close ( AVCodecContext * avctx ) [static]

Definition at line 627 of file shorten.c.

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

Definition at line 413 of file shorten.c.

static av_cold int shorten_decode_init ( AVCodecContext * avctx ) [static]

Definition at line 111 of file shorten.c.

Variable Documentation

AVCodec ff_shorten_decoder

Initial value:

 {
    .name           = "shorten",
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = CODEC_ID_SHORTEN,
    .priv_data_size = sizeof(ShortenContext),
    .init           = shorten_decode_init,
    .close          = shorten_decode_close,
    .decode         = shorten_decode_frame,
    .capabilities   = CODEC_CAP_DELAY | CODEC_CAP_DR1,
    .long_name= NULL_IF_CONFIG_SMALL("Shorten"),
}

Definition at line 643 of file shorten.c.

const int fixed_coeffs[3][3] [static]

Initial value:

 {
    { 1,  0,  0 },
    { 2, -1,  0 },
    { 3, -3,  1 }
}

Definition at line 269 of file shorten.c.

Referenced by decode_subframe_lpc().

const uint8_t is_audio_command[10] = { 1, 1, 1, 1, 0, 0, 0, 1, 1, 0 } [static]

indicates if the FN_* command is audio or non-audio

Definition at line 74 of file shorten.c.

Referenced by shorten_decode_frame().

libavcodec/shorten.c File Reference

Data Structures

Defines

Typedefs

Functions

Variables

Detailed Description

Define Documentation

Typedef Documentation

Function Documentation

Variable Documentation