shorten.c File Reference

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

Go to the source code of this file.

Data Structures
struct	ShortenContext

Macros
#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_S8   1
#define	TYPE_U8   2
#define	TYPE_S16HL   3
#define	TYPE_U16HL   4
#define	TYPE_S16LH   5
#define	TYPE_U16LH   6
#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 int	init_offset (ShortenContext *s)
static int	decode_aiff_header (AVCodecContext *avctx, const uint8_t *header, int header_size)
static int	decode_wave_header (AVCodecContext *avctx, const uint8_t *header, int header_size)
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 More...
static const int	fixed_coeffs [][3]
AVCodec	ff_shorten_decoder

Detailed Description

Shorten decoder

Author

Jeff Muizelaar

Definition in file shorten.c.

Macro Definition Documentation

MAX_CHANNELS

#define MAX_CHANNELS   8

Definition at line 36 of file shorten.c.

MAX_BLOCKSIZE

#define MAX_BLOCKSIZE   65535

Definition at line 37 of file shorten.c.

OUT_BUFFER_SIZE

#define OUT_BUFFER_SIZE   16384

Definition at line 39 of file shorten.c.

ULONGSIZE

#define ULONGSIZE   2

Definition at line 41 of file shorten.c.

WAVE_FORMAT_PCM

#define WAVE_FORMAT_PCM   0x0001

Definition at line 43 of file shorten.c.

DEFAULT_BLOCK_SIZE

#define DEFAULT_BLOCK_SIZE   256

Definition at line 45 of file shorten.c.

TYPESIZE

#define TYPESIZE   4

Definition at line 47 of file shorten.c.

CHANSIZE

#define CHANSIZE   0

Definition at line 48 of file shorten.c.

LPCQSIZE

#define LPCQSIZE   2

Definition at line 49 of file shorten.c.

ENERGYSIZE

#define ENERGYSIZE   3

Definition at line 50 of file shorten.c.

BITSHIFTSIZE

#define BITSHIFTSIZE   2

Definition at line 51 of file shorten.c.

TYPE_S8

#define TYPE_S8   1

Definition at line 53 of file shorten.c.

TYPE_U8

#define TYPE_U8   2

Definition at line 54 of file shorten.c.

TYPE_S16HL

#define TYPE_S16HL   3

Definition at line 55 of file shorten.c.

TYPE_U16HL

#define TYPE_U16HL   4

Definition at line 56 of file shorten.c.

TYPE_S16LH

#define TYPE_S16LH   5

Definition at line 57 of file shorten.c.

TYPE_U16LH

#define TYPE_U16LH   6

Definition at line 58 of file shorten.c.

NWRAP

#define NWRAP   3

Definition at line 60 of file shorten.c.

NSKIPSIZE

#define NSKIPSIZE   1

Definition at line 61 of file shorten.c.

LPCQUANT

#define LPCQUANT   5

Definition at line 63 of file shorten.c.

V2LPCQOFFSET

#define V2LPCQOFFSET   (1 << LPCQUANT)

Definition at line 64 of file shorten.c.

FNSIZE

#define FNSIZE   2

Definition at line 66 of file shorten.c.

FN_DIFF0

#define FN_DIFF0   0

Definition at line 67 of file shorten.c.

FN_DIFF1

#define FN_DIFF1   1

Definition at line 68 of file shorten.c.

FN_DIFF2

#define FN_DIFF2   2

Definition at line 69 of file shorten.c.

FN_DIFF3

#define FN_DIFF3   3

Definition at line 70 of file shorten.c.

FN_QUIT

#define FN_QUIT   4

Definition at line 71 of file shorten.c.

FN_BLOCKSIZE

#define FN_BLOCKSIZE   5

Definition at line 72 of file shorten.c.

FN_BITSHIFT

#define FN_BITSHIFT   6

Definition at line 73 of file shorten.c.

FN_QLPC

#define FN_QLPC   7

Definition at line 74 of file shorten.c.

FN_ZERO

#define FN_ZERO   8

Definition at line 75 of file shorten.c.

FN_VERBATIM

#define FN_VERBATIM   9

Definition at line 76 of file shorten.c.

VERBATIM_CKSIZE_SIZE

#define VERBATIM_CKSIZE_SIZE   5

Definition at line 81 of file shorten.c.

VERBATIM_BYTE_SIZE

#define VERBATIM_BYTE_SIZE   8

Definition at line 82 of file shorten.c.

CANONICAL_HEADER_SIZE

#define CANONICAL_HEADER_SIZE   44

Definition at line 83 of file shorten.c.

Function Documentation

shorten_decode_init()

static av_cold int shorten_decode_init ( AVCodecContext *  avctx )

static

Definition at line 117 of file shorten.c.

allocate_buffers()

static int allocate_buffers ( ShortenContext *  s )

static

Definition at line 127 of file shorten.c.

Referenced by read_header().

get_uint()

static unsigned int get_uint ( ShortenContext *  s, int  k  )

inlinestatic

Definition at line 161 of file shorten.c.

Referenced by read_header(), and shorten_decode_frame().

fix_bitshift()

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

static

Definition at line 171 of file shorten.c.

Referenced by shorten_decode_frame().

init_offset()

static int init_offset ( ShortenContext *  s )

static

Definition at line 184 of file shorten.c.

Referenced by read_header().

decode_aiff_header()

static int decode_aiff_header ( AVCodecContext *  avctx, const uint8_t *  header, int  header_size  )

static

Definition at line 210 of file shorten.c.

Referenced by read_header().

decode_wave_header()

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

static

Definition at line 278 of file shorten.c.

Referenced by read_header().

decode_subframe_lpc()

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

static

Definition at line 350 of file shorten.c.

Referenced by shorten_decode_frame().

read_header()

static int read_header ( ShortenContext *  s )

static

Definition at line 405 of file shorten.c.

Referenced by shorten_decode_frame().

shorten_decode_frame()

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

static

Definition at line 520 of file shorten.c.

shorten_decode_close()

static av_cold int shorten_decode_close ( AVCodecContext *  avctx )

static

Definition at line 786 of file shorten.c.

Variable Documentation

is_audio_command

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 79 of file shorten.c.

Referenced by shorten_decode_frame().

fixed_coeffs

const int fixed_coeffs[][3]

static

Initial value:

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

Definition at line 343 of file shorten.c.

Referenced by decode_subframe_lpc().

ff_shorten_decoder

AVCodec ff_shorten_decoder

Initial value:

= {
    .name           = "shorten",
    .long_name      = NULL_IF_CONFIG_SMALL("Shorten"),
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = AV_CODEC_ID_SHORTEN,
    .priv_data_size = sizeof(ShortenContext),
    .init           = shorten_decode_init,
    .close          = shorten_decode_close,
    .decode         = shorten_decode_frame,
    .capabilities   = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_DR1,
    .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
                                                      AV_SAMPLE_FMT_U8P,
                                                      AV_SAMPLE_FMT_NONE },
}

Definition at line 802 of file shorten.c.