huffyuvdec.c File Reference

huffyuv decoder More...

#include "avcodec.h"
#include "get_bits.h"
#include "huffyuv.h"
#include "huffyuvdsp.h"
#include "lossless_videodsp.h"
#include "thread.h"
#include "libavutil/imgutils.h"
#include "libavutil/pixdesc.h"

Go to the source code of this file.

Macros
#define	UNCHECKED_BITSTREAM_READER   1
#define	classic_shift_luma_table_size   42
#define	classic_shift_chroma_table_size   59
#define	VLC_INTERN(dst, table, gb, name, bits, max_depth)
	Subset of GET_VLC for use in hand-roller VLC code. More...
#define	GET_VLC_DUAL(dst0, dst1, name, gb, dtable, table1, table2, bits, max_depth, OP)
#define	OP8bits(dst0, dst1, code)   dst0 = code>>8; dst1 = code
#define	READ_2PIX(dst0, dst1, plane1)
#define	READ_2PIX_PLANE(dst0, dst1, plane, OP)
#define	OP14bits(dst0, dst1, code)   dst0 = code>>8; dst1 = sign_extend(code, 8)
#define	READ_2PIX_PLANE16(dst0, dst1, plane)

Functions
static int	read_len_table (uint8_t *dst, GetBitContext *gb, int n)
static int	generate_joint_tables (HYuvContext *s)
static int	read_huffman_tables (HYuvContext *s, const uint8_t *src, int length)
static int	read_old_huffman_tables (HYuvContext *s)
static av_cold int	decode_end (AVCodecContext *avctx)
static av_cold int	decode_init (AVCodecContext *avctx)
static void	decode_422_bitstream (HYuvContext *s, int count)
static void	decode_plane_bitstream (HYuvContext *s, int width, int plane)
static void	decode_gray_bitstream (HYuvContext *s, int count)
static av_always_inline void	decode_bgr_1 (HYuvContext *s, int count, int decorrelate, int alpha)
static void	decode_bgr_bitstream (HYuvContext *s, int count)
static void	draw_slice (HYuvContext *s, AVFrame *frame, int y)
static int	left_prediction (HYuvContext *s, uint8_t *dst, const uint8_t *src, int w, int acc)
static void	add_bytes (HYuvContext *s, uint8_t *dst, uint8_t *src, int w)
static void	add_median_prediction (HYuvContext *s, uint8_t *dst, const uint8_t *src, const uint8_t *diff, int w, int *left, int *left_top)
static int	decode_frame (AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)

Variables
static const unsigned char	classic_shift_luma [classic_shift_luma_table_size+AV_INPUT_BUFFER_PADDING_SIZE]
static const unsigned char	classic_shift_chroma [classic_shift_chroma_table_size+AV_INPUT_BUFFER_PADDING_SIZE]
static const unsigned char	classic_add_luma [256]
static const unsigned char	classic_add_chroma [256]
AVCodec	ff_huffyuv_decoder

Detailed Description

huffyuv decoder

Definition in file huffyuvdec.c.

Macro Definition Documentation

UNCHECKED_BITSTREAM_READER

#define UNCHECKED_BITSTREAM_READER   1

Definition at line 33 of file huffyuvdec.c.

classic_shift_luma_table_size

#define classic_shift_luma_table_size   42

Definition at line 44 of file huffyuvdec.c.

Referenced by read_old_huffman_tables().

classic_shift_chroma_table_size

#define classic_shift_chroma_table_size   59

Definition at line 52 of file huffyuvdec.c.

Referenced by read_old_huffman_tables().

VLC_INTERN

#define VLC_INTERN	(		dst,
			table,
			gb,
			name,
			bits,
			max_depth
	)

Value:

code = table[index][0];                                 \
    n    = table[index][1];                                 \
    if (max_depth > 1 && n < 0) {                           \
        LAST_SKIP_BITS(name, gb, bits);                     \
        UPDATE_CACHE(name, gb);                             \
                                                            \
        nb_bits = -n;                                       \
        index   = SHOW_UBITS(name, gb, nb_bits) + code;     \
        code    = table[index][0];                          \
        n       = table[index][1];                          \
        if (max_depth > 2 && n < 0) {                       \
            LAST_SKIP_BITS(name, gb, nb_bits);              \
            UPDATE_CACHE(name, gb);                         \
                                                            \
            nb_bits = -n;                                   \
            index   = SHOW_UBITS(name, gb, nb_bits) + code; \
            code    = table[index][0];                      \
            n       = table[index][1];                      \
        }                                                   \
    }                                                       \
    dst = code;                                             \
    LAST_SKIP_BITS(name, gb, n)

Subset of GET_VLC for use in hand-roller VLC code.

Definition at line 606 of file huffyuvdec.c.

Referenced by decode_bgr_1(), and decode_plane_bitstream().

GET_VLC_DUAL

#define GET_VLC_DUAL	(		dst0,
			dst1,
			name,
			gb,
			dtable,
			table1,
			table2,
			bits,
			max_depth,
			OP
	)

Value:

do {                                                            \
        unsigned int index = SHOW_UBITS(name, gb, bits);            \
        int          code, n = dtable[index][1];                    \
                                                                    \
        if (n<=0) {                                                 \
            int nb_bits;                                            \
            VLC_INTERN(dst0, table1, gb, name, bits, max_depth);    \
                                                                    \
            UPDATE_CACHE(re, gb);                                   \
            index = SHOW_UBITS(name, gb, bits);                     \
            VLC_INTERN(dst1, table2, gb, name, bits, max_depth);    \
        } else {                                                    \
            code = dtable[index][0];                                \
            OP(dst0, dst1, code);                                   \
            LAST_SKIP_BITS(name, gb, n);                            \
        }                                                           \
    } while (0)

Definition at line 631 of file huffyuvdec.c.

OP8bits

#define OP8bits	(		dst0,
			dst1,
			code
	)		dst0 = code>>8; dst1 = code

Definition at line 651 of file huffyuvdec.c.

Referenced by decode_plane_bitstream().

READ_2PIX

#define READ_2PIX	(		dst0,
			dst1,
			plane1
	)

Value:

UPDATE_CACHE(re, &s->gb);                                           \
    GET_VLC_DUAL(dst0, dst1, re, &s->gb, s->vlc[4+plane1].table,        \
                 s->vlc[0].table, s->vlc[plane1].table, VLC_BITS, 3, OP8bits)

Definition at line 653 of file huffyuvdec.c.

Referenced by decode_422_bitstream(), and decode_gray_bitstream().

READ_2PIX_PLANE

#define READ_2PIX_PLANE	(		dst0,
			dst1,
			plane,
			OP
	)

Value:

UPDATE_CACHE(re, &s->gb); \
    GET_VLC_DUAL(dst0, dst1, re, &s->gb, s->vlc[4+plane].table, \
                 s->vlc[plane].table, s->vlc[plane].table, VLC_BITS, 3, OP)

Definition at line 687 of file huffyuvdec.c.

Referenced by decode_plane_bitstream().

OP14bits

#define OP14bits	(		dst0,
			dst1,
			code
	)		dst0 = code>>8; dst1 = sign_extend(code, 8)

Definition at line 692 of file huffyuvdec.c.

Referenced by decode_plane_bitstream().

READ_2PIX_PLANE16

#define READ_2PIX_PLANE16	(		dst0,
			dst1,
			plane
	)

Value:

{\
    dst0 = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3)<<2;\
    dst0 += get_bits(&s->gb, 2);\
    dst1 = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3)<<2;\
    dst1 += get_bits(&s->gb, 2);\
}

Definition at line 696 of file huffyuvdec.c.

Referenced by decode_plane_bitstream().

Function Documentation

read_len_table()

static int read_len_table ( uint8_t *  dst, GetBitContext *  gb, int  n  )

static

Definition at line 99 of file huffyuvdec.c.

Referenced by read_huffman_tables(), and read_old_huffman_tables().

generate_joint_tables()

static int generate_joint_tables ( HYuvContext *  s )

static

Definition at line 118 of file huffyuvdec.c.

Referenced by read_huffman_tables(), and read_old_huffman_tables().

read_huffman_tables()

static int read_huffman_tables ( HYuvContext *  s, const uint8_t *  src, int  length  )

static

Definition at line 208 of file huffyuvdec.c.

Referenced by decode_frame(), and decode_init().

read_old_huffman_tables()

static int read_old_huffman_tables ( HYuvContext *  s )

static

Definition at line 237 of file huffyuvdec.c.

Referenced by decode_init().

decode_end()

static av_cold int decode_end ( AVCodecContext *  avctx )

static

Definition at line 277 of file huffyuvdec.c.

Referenced by decode_init().

decode_init()

static av_cold int decode_init ( AVCodecContext *  avctx )

static

Definition at line 291 of file huffyuvdec.c.

decode_422_bitstream()

static void decode_422_bitstream ( HYuvContext *  s, int  count  )

static

Definition at line 658 of file huffyuvdec.c.

Referenced by decode_frame().

decode_plane_bitstream()

static void decode_plane_bitstream ( HYuvContext *  s, int  width, int  plane  )

static

Definition at line 702 of file huffyuvdec.c.

Referenced by decode_frame().

decode_gray_bitstream()

static void decode_gray_bitstream ( HYuvContext *  s, int  count  )

static

Definition at line 763 of file huffyuvdec.c.

Referenced by decode_frame().

decode_bgr_1()

static av_always_inline void decode_bgr_1 ( HYuvContext *  s, int  count, int  decorrelate, int  alpha  )

static

Definition at line 781 of file huffyuvdec.c.

Referenced by decode_bgr_bitstream().

decode_bgr_bitstream()

static void decode_bgr_bitstream ( HYuvContext *  s, int  count  )

static

Definition at line 839 of file huffyuvdec.c.

Referenced by decode_frame().

draw_slice()

static void draw_slice ( HYuvContext *  s, AVFrame *  frame, int  y  )

static

Definition at line 854 of file huffyuvdec.c.

Referenced by decode_frame().

left_prediction()

static int left_prediction ( HYuvContext *  s, uint8_t *  dst, const uint8_t *  src, int  w, int  acc  )

static

Definition at line 882 of file huffyuvdec.c.

Referenced by decode_frame().

add_bytes()

static void add_bytes ( HYuvContext *  s, uint8_t *  dst, uint8_t *  src, int  w  )

static

Definition at line 891 of file huffyuvdec.c.

Referenced by decode_frame().

add_median_prediction()

static void add_median_prediction ( HYuvContext *  s, uint8_t *  dst, const uint8_t *  src, const uint8_t *  diff, int  w, int *  left, int *  left_top  )

static

Definition at line 900 of file huffyuvdec.c.

Referenced by decode_frame().

decode_frame()

static int decode_frame ( AVCodecContext *  avctx, void *  data, int *  got_frame, AVPacket *  avpkt  )

static

Definition at line 908 of file huffyuvdec.c.

Variable Documentation

classic_shift_luma

const unsigned char classic_shift_luma[classic_shift_luma_table_size+AV_INPUT_BUFFER_PADDING_SIZE]

static

Initial value:

= {
    34, 36, 35, 69, 135, 232,   9, 16, 10, 24,  11,  23,  12,  16, 13, 10,
    14,  8, 15,  8,  16,   8,  17, 20, 16, 10, 207, 206, 205, 236, 11,  8,
    10, 21,  9, 23,   8,   8, 199, 70, 69, 68,   0,
  0,0,0,0,0,0,0,0,
}

Definition at line 45 of file huffyuvdec.c.

Referenced by read_old_huffman_tables().

classic_shift_chroma

const unsigned char classic_shift_chroma[classic_shift_chroma_table_size+AV_INPUT_BUFFER_PADDING_SIZE]

static

Initial value:

= {
    66, 36,  37,  38, 39, 40,  41,  75,  76,  77, 110, 239, 144, 81, 82,  83,
    84, 85, 118, 183, 56, 57,  88,  89,  56,  89, 154,  57,  58, 57, 26, 141,
    57, 56,  58,  57, 58, 57, 184, 119, 214, 245, 116,  83,  82, 49, 80,  79,
    78, 77,  44,  75, 41, 40,  39,  38,  37,  36,  34,  0,
  0,0,0,0,0,0,0,0,
}

Definition at line 53 of file huffyuvdec.c.

Referenced by read_old_huffman_tables().

classic_add_luma

const unsigned char classic_add_luma[256]

static

Initial value:

= {
     3,  9,  5, 12, 10, 35, 32, 29, 27, 50, 48, 45, 44, 41, 39, 37,
    73, 70, 68, 65, 64, 61, 58, 56, 53, 50, 49, 46, 44, 41, 38, 36,
    68, 65, 63, 61, 58, 55, 53, 51, 48, 46, 45, 43, 41, 39, 38, 36,
    35, 33, 32, 30, 29, 27, 26, 25, 48, 47, 46, 44, 43, 41, 40, 39,
    37, 36, 35, 34, 32, 31, 30, 28, 27, 26, 24, 23, 22, 20, 19, 37,
    35, 34, 33, 31, 30, 29, 27, 26, 24, 23, 21, 20, 18, 17, 15, 29,
    27, 26, 24, 22, 21, 19, 17, 16, 14, 26, 25, 23, 21, 19, 18, 16,
    15, 27, 25, 23, 21, 19, 17, 16, 14, 26, 25, 23, 21, 18, 17, 14,
    12, 17, 19, 13,  4,  9,  2, 11,  1,  7,  8,  0, 16,  3, 14,  6,
    12, 10,  5, 15, 18, 11, 10, 13, 15, 16, 19, 20, 22, 24, 27, 15,
    18, 20, 22, 24, 26, 14, 17, 20, 22, 24, 27, 15, 18, 20, 23, 25,
    28, 16, 19, 22, 25, 28, 32, 36, 21, 25, 29, 33, 38, 42, 45, 49,
    28, 31, 34, 37, 40, 42, 44, 47, 49, 50, 52, 54, 56, 57, 59, 60,
    62, 64, 66, 67, 69, 35, 37, 39, 40, 42, 43, 45, 47, 48, 51, 52,
    54, 55, 57, 59, 60, 62, 63, 66, 67, 69, 71, 72, 38, 40, 42, 43,
    46, 47, 49, 51, 26, 28, 30, 31, 33, 34, 18, 19, 11, 13,  7,  8,
}

Definition at line 61 of file huffyuvdec.c.

Referenced by read_old_huffman_tables().

classic_add_chroma

const unsigned char classic_add_chroma[256]

static

Initial value:

= {
     3,    1,   2,   2,   2,   2,   3,   3,   7,   5,   7,   5,   8,   6,  11,   9,
     7,   13,  11,  10,   9,   8,   7,   5,   9,   7,   6,   4,   7,   5,   8,   7,
     11,   8,  13,  11,  19,  15,  22,  23,  20,  33,  32,  28,  27,  29,  51,  77,
     43,  45,  76,  81,  46,  82,  75,  55,  56, 144,  58,  80,  60,  74, 147,  63,
    143,  65,  66,  67,  68,  69,  70,  71,  72,  73,  74,  75,  76,  77,  78,  79,
     80,  81,  82,  83,  84,  85,  86,  87,  88,  89,  90,  91,  27,  30,  21,  22,
     17,  14,   5,   6, 100,  54,  47,  50,  51,  53, 106, 107, 108, 109, 110, 111,
    112, 113, 114, 115,   4, 117, 118,  92,  94, 121, 122,   3, 124, 103,   2,   1,
      0, 129, 130, 131, 120, 119, 126, 125, 136, 137, 138, 139, 140, 141, 142, 134,
    135, 132, 133, 104,  64, 101,  62,  57, 102,  95,  93,  59,  61,  28,  97,  96,
     52,  49,  48,  29,  32,  25,  24,  46,  23,  98,  45,  44,  43,  20,  42,  41,
     19,  18,  99,  40,  15,  39,  38,  16,  13,  12,  11,  37,  10,   9,   8,  36,
      7, 128, 127, 105, 123, 116,  35,  34,  33, 145,  31,  79,  42, 146,  78,  26,
     83,  48,  49,  50,  44,  47,  26,  31,  30,  18,  17,  19,  21,  24,  25,  13,
     14,  16,  17,  18,  20,  21,  12,  14,  15,   9,  10,   6,   9,   6,   5,   8,
      6,  12,   8,  10,   7,   9,   6,   4,   6,   2,   2,   3,   3,   3,   3,   2,
}

Definition at line 80 of file huffyuvdec.c.

Referenced by read_old_huffman_tables().

ff_huffyuv_decoder

AVCodec ff_huffyuv_decoder

Initial value:

= {
    .name             = "huffyuv",
    .long_name        = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),
    .type             = AVMEDIA_TYPE_VIDEO,
    .id               = AV_CODEC_ID_HUFFYUV,
    .priv_data_size   = sizeof(HYuvContext),
    .init             = decode_init,
    .close            = decode_end,
    .decode           = decode_frame,
    .capabilities     = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DRAW_HORIZ_BAND |
                        AV_CODEC_CAP_FRAME_THREADS,
    .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
}

Definition at line 1246 of file huffyuvdec.c.