snowdec.c File Reference

#include "libavutil/emms.h"
#include "libavutil/intmath.h"
#include "libavutil/log.h"
#include "libavutil/mem.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "decode.h"
#include "snow_dwt.h"
#include "snow.h"
#include "rangecoder.h"
#include "mathops.h"

Go to the source code of this file.

Macros
#define	GET_S(dst, check)

Functions
static int	get_symbol (RangeCoder *c, uint8_t *state, int is_signed)
static int	get_symbol2 (RangeCoder *c, uint8_t *state, int log2)
static void	unpack_coeffs (SnowContext *s, SubBand *b, SubBand *parent, int orientation)
static av_always_inline void	predict_slice_buffered (SnowContext *s, slice_buffer *sb, IDWTELEM *old_buffer, int plane_index, int add, int mb_y)
static void	decode_subband_slice_buffered (SnowContext *s, SubBand *b, slice_buffer *sb, int start_y, int h, int save_state[1])
static int	decode_q_branch (SnowContext *s, int level, int x, int y)
static void	dequantize_slice_buffered (SnowContext *s, slice_buffer *sb, SubBand *b, IDWTELEM *src, int stride, int start_y, int end_y)
static void	correlate_slice_buffered (SnowContext *s, slice_buffer *sb, SubBand *b, IDWTELEM *src, int stride, int inverse, int use_median, int start_y, int end_y)
static void	decode_qlogs (SnowContext *s)
static int	decode_header (SnowContext *s)
static int	decode_blocks (SnowContext *s)
static int	decode_frame (AVCodecContext *avctx, AVFrame *picture, int *got_frame, AVPacket *avpkt)
static av_cold int	decode_end (AVCodecContext *avctx)

Variables
const FFCodec	ff_snow_decoder

Macro Definition Documentation

GET_S

#define GET_S	(		dst,
			check
	)

Value:

    tmp= get_symbol(&s->c, s->header_state, 0);\
    if(!(check)){\
        av_log(s->avctx, AV_LOG_ERROR, "Error " #dst " is %d\n", tmp);\
        return AVERROR_INVALIDDATA;\
    }\
    dst= tmp;

Definition at line 440 of file snowdec.c.

Function Documentation

get_symbol()

static int get_symbol ( RangeCoder *  c, uint8_t *  state, int  is_signed  )

inlinestatic

Definition at line 34 of file snowdec.c.

Referenced by decode_header(), decode_q_branch(), and decode_qlogs().

get_symbol2()

static int get_symbol2 ( RangeCoder *  c, uint8_t *  state, int  log2  )

inlinestatic

Definition at line 57 of file snowdec.c.

Referenced by unpack_coeffs().

unpack_coeffs()

static void unpack_coeffs ( SnowContext *  s, SubBand *  b, SubBand *  parent, int  orientation  )

static

Definition at line 76 of file snowdec.c.

Referenced by decode_frame().

predict_slice_buffered()

static av_always_inline void predict_slice_buffered ( SnowContext *  s, slice_buffer *  sb, IDWTELEM *  old_buffer, int  plane_index, int  add, int  mb_y  )

static

Definition at line 181 of file snowdec.c.

Referenced by decode_frame().

decode_subband_slice_buffered()

static void decode_subband_slice_buffered ( SnowContext *  s, SubBand *  b, slice_buffer *  sb, int  start_y, int  h, int  save_state[1]  )

inlinestatic

Definition at line 263 of file snowdec.c.

Referenced by decode_frame().

decode_q_branch()

static int decode_q_branch ( SnowContext *  s, int  level, int  x, int  y  )

static

Definition at line 304 of file snowdec.c.

Referenced by decode_blocks().

dequantize_slice_buffered()

static void dequantize_slice_buffered ( SnowContext *  s, slice_buffer *  sb, SubBand *  b, IDWTELEM *  src, int  stride, int  start_y, int  end_y  )

static

Definition at line 371 of file snowdec.c.

Referenced by decode_frame().

correlate_slice_buffered()

static void correlate_slice_buffered ( SnowContext *  s, slice_buffer *  sb, SubBand *  b, IDWTELEM *  src, int  stride, int  inverse, int  use_median, int  start_y, int  end_y  )

static

Definition at line 394 of file snowdec.c.

Referenced by decode_frame().

decode_qlogs()

static void decode_qlogs ( SnowContext *  s )

static

Definition at line 424 of file snowdec.c.

Referenced by decode_header().

decode_header()

static int decode_header ( SnowContext *  s )

static

Definition at line 448 of file snowdec.c.

Referenced by decode_frame().

decode_blocks()

static int decode_blocks ( SnowContext *  s )

static

Definition at line 571 of file snowdec.c.

Referenced by decode_frame().

decode_frame()

static int decode_frame ( AVCodecContext *  avctx, AVFrame *  picture, int *  got_frame, AVPacket *  avpkt  )

static

Definition at line 588 of file snowdec.c.

decode_end()

static av_cold int decode_end ( AVCodecContext *  avctx )

static

Definition at line 808 of file snowdec.c.

Variable Documentation

ff_snow_decoder

const FFCodec ff_snow_decoder

Initial value:

= {
    .p.name         = "snow",
    CODEC_LONG_NAME("Snow"),
    .p.type         = AVMEDIA_TYPE_VIDEO,
    .p.id           = AV_CODEC_ID_SNOW,
    .priv_data_size = sizeof(SnowContext),
    .init           = ff_snow_common_init,
    .close          = decode_end,
    FF_CODEC_DECODE_CB(decode_frame),
    .p.capabilities = AV_CODEC_CAP_DR1,
    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
}

Definition at line 822 of file snowdec.c.