lagarith.c File Reference

#include <inttypes.h>
#include "libavutil/thread.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "get_bits.h"
#include "mathops.h"
#include "lagarithrac.h"
#include "lossless_videodsp.h"
#include "thread.h"

Go to the source code of this file.

Data Structures
struct	LagarithContext

Macros
#define	VLC_BITS   7

Enumerations
enum	LagarithFrameType {   FRAME_RAW = 1, FRAME_U_RGB24 = 2, FRAME_ARITH_YUY2 = 3, FRAME_ARITH_RGB24 = 4,   FRAME_SOLID_GRAY = 5, FRAME_SOLID_COLOR = 6, FRAME_OLD_ARITH_RGB = 7, FRAME_ARITH_RGBA = 8,   FRAME_SOLID_RGBA = 9, FRAME_ARITH_YV12 = 10, FRAME_REDUCED_RES = 11 }

Functions
static av_cold void	lag_init_static_data (void)
static uint64_t	softfloat_reciprocal (uint32_t denom)
	Compute the 52-bit mantissa of 1/(double)denom. More...
static uint32_t	softfloat_mul (uint32_t x, uint64_t mantissa)
	(uint32_t)(x*f), where f has the given mantissa, and exponent 0 Used in combination with softfloat_reciprocal computes x/(double)denom. More...
static uint8_t	lag_calc_zero_run (int8_t x)
static int	lag_decode_prob (GetBitContext *gb, uint32_t *value)
static int	lag_read_prob_header (lag_rac *rac, GetBitContext *gb)
static void	add_lag_median_prediction (uint8_t *dst, uint8_t *src1, uint8_t *diff, int w, int *left, int *left_top)
static void	lag_pred_line (LagarithContext *l, uint8_t *buf, int width, int stride, int line)
static void	lag_pred_line_yuy2 (LagarithContext *l, uint8_t *buf, int width, int stride, int line, int is_luma)
static int	lag_decode_line (LagarithContext *l, lag_rac *rac, uint8_t *dst, int width, int stride, int esc_count)
static int	lag_decode_zero_run_line (LagarithContext *l, uint8_t *dst, const uint8_t *src, const uint8_t *src_end, int width, int esc_count)
static int	lag_decode_arith_plane (LagarithContext *l, uint8_t *dst, int width, int height, int stride, const uint8_t *src, int src_size)
static int	lag_decode_frame (AVCodecContext *avctx, AVFrame *p, int *got_frame, AVPacket *avpkt)
	Decode a frame. More...
static av_cold int	lag_decode_init (AVCodecContext *avctx)

Variables
static VLCElem	lag_tab [1<< VLC_BITS]
static const uint8_t	lag_bits []
static const uint8_t	lag_codes []
static const uint8_t	lag_symbols []
const FFCodec	ff_lagarith_decoder

Detailed Description

Lagarith lossless decoder

Author

Nathan Caldwell

Definition in file lagarith.c.

Macro Definition Documentation

VLC_BITS

#define VLC_BITS   7

Definition at line 40 of file lagarith.c.

Enumeration Type Documentation

LagarithFrameType

enum LagarithFrameType

Enumerator
FRAME_RAW	uncompressed
FRAME_U_RGB24	unaligned RGB24
FRAME_ARITH_YUY2	arithmetic coded YUY2
FRAME_ARITH_RGB24	arithmetic coded RGB24
FRAME_SOLID_GRAY	solid grayscale color frame
FRAME_SOLID_COLOR	solid non-grayscale color frame
FRAME_OLD_ARITH_RGB	obsolete arithmetic coded RGB (no longer encoded by upstream since version 1.1.0)
FRAME_ARITH_RGBA	arithmetic coded RGBA
FRAME_SOLID_RGBA	solid RGBA color frame
FRAME_ARITH_YV12	arithmetic coded YV12
FRAME_REDUCED_RES	reduced resolution YV12 frame

Definition at line 42 of file lagarith.c.

Function Documentation

lag_init_static_data()

static av_cold void lag_init_static_data ( void  )

static

Definition at line 86 of file lagarith.c.

Referenced by lag_decode_init().

softfloat_reciprocal()

static uint64_t softfloat_reciprocal ( uint32_t  denom )

static

Compute the 52-bit mantissa of 1/(double)denom.

This crazy format uses floats in an entropy coder and we have to match x86 rounding exactly, thus ordinary floats aren't portable enough.

Parameters

denom

denominator

Returns

52-bit mantissa

See also

softfloat_mul

Definition at line 100 of file lagarith.c.

Referenced by lag_read_prob_header().

softfloat_mul()

static uint32_t softfloat_mul ( uint32_t  x, uint64_t  mantissa  )

static

(uint32_t)(x*f), where f has the given mantissa, and exponent 0 Used in combination with softfloat_reciprocal computes x/(double)denom.

Parameters

x	32-bit integer factor
mantissa	mantissa of f with exponent 0

Returns

32-bit integer value (x*f)

See also

softfloat_reciprocal

Definition at line 119 of file lagarith.c.

Referenced by lag_read_prob_header().

lag_calc_zero_run()

static uint8_t lag_calc_zero_run ( int8_t  x )

static

Definition at line 130 of file lagarith.c.

Referenced by lag_decode_line(), and lag_decode_zero_run_line().

lag_decode_prob()

static int lag_decode_prob ( GetBitContext *  gb, uint32_t *  value  )

static

Definition at line 135 of file lagarith.c.

Referenced by lag_read_prob_header().

lag_read_prob_header()

static int lag_read_prob_header ( lag_rac *  rac, GetBitContext *  gb  )

static

Definition at line 156 of file lagarith.c.

Referenced by lag_decode_arith_plane().

add_lag_median_prediction()

static void add_lag_median_prediction ( uint8_t *  dst, uint8_t *  src1, uint8_t *  diff, int  w, int *  left, int *  left_top  )

static

Definition at line 262 of file lagarith.c.

Referenced by lag_pred_line().

lag_pred_line()

static void lag_pred_line ( LagarithContext *  l, uint8_t *  buf, int  width, int  stride, int  line  )

static

Definition at line 286 of file lagarith.c.

Referenced by lag_decode_arith_plane().

lag_pred_line_yuy2()

static void lag_pred_line_yuy2 ( LagarithContext *  l, uint8_t *  buf, int  width, int  stride, int  line, int  is_luma  )

static

Definition at line 312 of file lagarith.c.

Referenced by lag_decode_arith_plane().

lag_decode_line()

static int lag_decode_line ( LagarithContext *  l, lag_rac *  rac, uint8_t *  dst, int  width, int  stride, int  esc_count  )

static

Definition at line 349 of file lagarith.c.

Referenced by lag_decode_arith_plane().

lag_decode_zero_run_line()

static int lag_decode_zero_run_line ( LagarithContext *  l, uint8_t *  dst, const uint8_t *  src, const uint8_t *  src_end, int  width, int  esc_count  )

static

Definition at line 391 of file lagarith.c.

Referenced by lag_decode_arith_plane().

lag_decode_arith_plane()

static int lag_decode_arith_plane ( LagarithContext *  l, uint8_t *  dst, int  width, int  height, int  stride, const uint8_t *  src, int  src_size  )

static

Definition at line 452 of file lagarith.c.

Referenced by lag_decode_frame().

lag_decode_frame()

static int lag_decode_frame ( AVCodecContext *  avctx, AVFrame *  p, int *  got_frame, AVPacket *  avpkt  )

static

Decode a frame.

Parameters

avctx	codec context
data	output AVFrame
data_size	size of output data or 0 if no picture is returned
avpkt	input packet

Returns

number of consumed bytes on success or negative if decode fails

Definition at line 560 of file lagarith.c.

lag_decode_init()

static av_cold int lag_decode_init ( AVCodecContext *  avctx )

static

Definition at line 741 of file lagarith.c.

Variable Documentation

lag_tab

VLCElem lag_tab[1<< VLC_BITS]

static

Definition at line 63 of file lagarith.c.

Referenced by lag_decode_prob(), and lag_init_static_data().

lag_bits

const uint8_t lag_bits[]

static

Initial value:

= {
    7, 7, 2, 7, 3, 4, 5, 6, 7, 7, 7, 7, 7, 6, 7, 4, 5, 7, 7, 7, 7,
    5, 6, 7, 7, 7, 7, 7, 7, 6, 7, 7, 7, 7, 7, 6, 7, 7, 7, 7, 7, 7, 7,
    7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
}

Definition at line 65 of file lagarith.c.

Referenced by lag_init_static_data().

lag_codes

const uint8_t lag_codes[]

static

Initial value:

= {
    0x01, 0x02, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x04, 0x05,
    0x08, 0x09, 0x0A, 0x0B, 0x0B, 0x0B, 0x0B, 0x10, 0x11, 0x12, 0x13,
    0x13, 0x13, 0x14, 0x15, 0x20, 0x21, 0x22, 0x23, 0x23, 0x24, 0x25,
    0x28, 0x29, 0x2A, 0x2B, 0x2B, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45,
    0x48, 0x49, 0x4A, 0x4B, 0x50, 0x51, 0x52, 0x53, 0x54, 0x55,
}

Definition at line 71 of file lagarith.c.

Referenced by lag_init_static_data().

lag_symbols

const uint8_t lag_symbols[]

static

Initial value:

= {
    20, 12, 0, 12, 1, 2, 4, 7, 7, 28, 4, 25, 17,
    10, 17, 3, 6, 2, 23, 15, 15, 5, 9, 10, 31, 1, 22,
    14, 14, 8, 9, 30, 6, 27, 19, 11, 19, 0, 21, 13, 13,
    8, 29, 5, 26, 18, 18, 3, 24, 16, 16, 11, 32,
}

Definition at line 79 of file lagarith.c.

Referenced by lag_init_static_data().

ff_lagarith_decoder

const FFCodec ff_lagarith_decoder

Initial value:

= {
    .p.name         = "lagarith",
    CODEC_LONG_NAME("Lagarith lossless"),
    .p.type         = AVMEDIA_TYPE_VIDEO,
    .p.id           = AV_CODEC_ID_LAGARITH,
    .priv_data_size = sizeof(LagarithContext),
    .init           = lag_decode_init,
    FF_CODEC_DECODE_CB(lag_decode_frame),
    .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
}

Definition at line 753 of file lagarith.c.