exr.c File Reference

OpenEXR decoder. More...

#include <float.h>
#include <zlib.h>
#include "libavutil/avassert.h"
#include "libavutil/common.h"
#include "libavutil/imgutils.h"
#include "libavutil/intfloat.h"
#include "libavutil/opt.h"
#include "libavutil/color_utils.h"
#include "avcodec.h"
#include "bytestream.h"
#include "exrdsp.h"
#include "get_bits.h"
#include "internal.h"
#include "mathops.h"
#include "thread.h"

Classes
struct	EXRChannel
struct	EXRTileAttribute
struct	EXRThreadData
struct	EXRContext
struct	HufDec

Macros
#define	HALF_FLOAT_MIN_BIASED_EXP_AS_SINGLE_FP_EXP   0x38000000
#define	HALF_FLOAT_MAX_BIASED_EXP_AS_SINGLE_FP_EXP   0x47800000
#define	FLOAT_MAX_BIASED_EXP   (0xFF << 23)
#define	HALF_FLOAT_MAX_BIASED_EXP   (0x1F << 10)
#define	USHORT_RANGE   (1 << 16)
#define	BITMAP_SIZE   (1 << 13)
#define	HUF_ENCBITS   16
#define	HUF_DECBITS   14
#define	HUF_ENCSIZE   ((1 << HUF_ENCBITS) + 1)
#define	HUF_DECSIZE   (1 << HUF_DECBITS)
#define	HUF_DECMASK   (HUF_DECSIZE - 1)
#define	SHORT_ZEROCODE_RUN   59
#define	LONG_ZEROCODE_RUN   63
#define	SHORTEST_LONG_RUN   (2 + LONG_ZEROCODE_RUN - SHORT_ZEROCODE_RUN)
#define	LONGEST_LONG_RUN   (255 + SHORTEST_LONG_RUN)
#define	get_char(c, lc, gb)
#define	get_code(po, rlc, c, lc, gb, out, oe, outb)
#define	NBITS   16
#define	A_OFFSET   (1 << (NBITS - 1))
#define	MOD_MASK   ((1 << NBITS) - 1)
#define	OFFSET(x)   offsetof(EXRContext, x)
#define	VD   AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM

Typedefs
typedef struct EXRChannel	EXRChannel
typedef struct EXRTileAttribute	EXRTileAttribute
typedef struct EXRThreadData	EXRThreadData
typedef struct EXRContext	EXRContext
typedef struct HufDec	HufDec

Enumerations
enum	ExrCompr {   EXR_RAW, EXR_RLE, EXR_ZIP1, EXR_ZIP16,   EXR_PIZ, EXR_PXR24, EXR_B44, EXR_B44A,   EXR_DWA, EXR_DWB, EXR_UNKN }
enum	ExrPixelType { EXR_UINT, EXR_HALF, EXR_FLOAT, EXR_UNKNOWN }
enum	ExrTileLevelMode { EXR_TILE_LEVEL_ONE, EXR_TILE_LEVEL_MIPMAP, EXR_TILE_LEVEL_RIPMAP, EXR_TILE_LEVEL_UNKNOWN }
enum	ExrTileLevelRound { EXR_TILE_ROUND_UP, EXR_TILE_ROUND_DOWN, EXR_TILE_ROUND_UNKNOWN }

Variables
AVCodec	ff_exr_decoder

Detailed Description

OpenEXR decoder.

Author

Jimmy Christensen

For more information on the OpenEXR format, visit: http://openexr.com/

exr_flt2uint() and exr_halflt2uint() is credited to Reimar Döffinger. exr_half2float() is credited to Aaftab Munshi, Dan Ginsburg, Dave Shreiner.

Macro Definition Documentation

get_char

#define get_char	(		c,
			lc,
			gb
	)

Value:

{                                                                             \
        c   = (c << 8) | bytestream2_get_byte(gb);                            \
        lc += 8;                                                              \
}

get_code

#define get_code	(		po,
			rlc,
			c,
			lc,
			gb,
			out,
			oe,
			outb
	)

Value:

{                                                                             \
        if (po == rlc) {                                                      \
            if (lc < 8)                                                       \
                get_char(c, lc, gb);                                          \
            lc -= 8;                                                          \
                                                                              \
            cs = c >> lc;                                                     \
                                                                              \
            if (out + cs > oe || out == outb)                                 \
                return AVERROR_INVALIDDATA;                                   \
                                                                              \
            s = out[-1];                                                      \
                                                                              \
            while (cs-- > 0)                                                  \
                *out++ = s;                                                   \
        } else if (out < oe) {                                                \
            *out++ = po;                                                      \
        } else {                                                              \
            return AVERROR_INVALIDDATA;                                       \
        }                                                                     \
}

Variable Documentation

ff_exr_decoder

AVCodec ff_exr_decoder

Initial value:

= {
    .name             = "exr",
    .long_name        = NULL_IF_CONFIG_SMALL("OpenEXR image"),
    .type             = AVMEDIA_TYPE_VIDEO,
    .id               = AV_CODEC_ID_EXR,
    .priv_data_size   = sizeof(EXRContext),
    .init             = decode_init,
    .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
    .close            = decode_end,
    .decode           = decode_frame,
    .capabilities     = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS |
                        AV_CODEC_CAP_SLICE_THREADS,
    .priv_class       = &exr_class,
}