OpenEXR decoder. More...

#include <zlib.h>
#include "get_bits.h"
#include "avcodec.h"
#include "bytestream.h"
#include "mathops.h"
#include "thread.h"
#include "libavutil/imgutils.h"
#include "libavutil/avassert.h"

Data Structures
struct	EXRChannel

struct	EXRThreadData

struct	EXRContext

struct	HufDec

Macros
#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)

#define	NBITS 16

#define	A_OFFSET (1 << (NBITS - 1))

#define	MOD_MASK ((1 << NBITS) - 1)

Enumerations
enum	ExrCompr { EXR_RAW = 0, EXR_RLE = 1, EXR_ZIP1 = 2, EXR_ZIP16 = 3, EXR_PIZ = 4, EXR_PXR24 = 5, EXR_B44 = 6, EXR_B44A = 7 }

enum	ExrPixelType { EXR_UINT, EXR_HALF, EXR_FLOAT }

Functions
static uint16_t	exr_flt2uint (uint32_t v)
	Converts from 32-bit float as uint32_t to uint16_t.

static uint16_t	exr_halflt2uint (uint16_t v)
	Converts from 16-bit float as uint16_t to uint16_t.

static unsigned int	get_header_variable_length (const uint8_t *buf, const uint8_t buf_end)
	Gets the size of the header variable.

static int	check_header_variable (AVCodecContext avctx, const uint8_t buf, const uint8_t buf_end, const char value_name, const char value_type, unsigned int minimum_length, unsigned int *variable_buffer_data_size)
	Checks if the variable name corresponds with it's data type.

static void	predictor (uint8_t *src, int size)

static void	reorder_pixels (uint8_t src, uint8_t dst, int size)

static int	zip_uncompress (const uint8_t src, int compressed_size, int uncompressed_size, EXRThreadData td)

static int	rle_uncompress (const uint8_t src, int compressed_size, int uncompressed_size, EXRThreadData td)

static uint16_t	reverse_lut (const uint8_t bitmap, uint16_t lut)

static void	apply_lut (const uint16_t lut, uint16_t dst, int dsize)

static void	huf_canonical_code_table (uint64_t *hcode)

static int	huf_unpack_enc_table (GetByteContext gb, int32_t im, int32_t iM, uint64_t hcode)

static int	huf_build_dec_table (const uint64_t hcode, int im, int iM, HufDec hdecod)

static int	huf_decode (const uint64_t hcode, const HufDec hdecod, GetByteContext gb, int nbits, int rlc, int no, uint16_t out)

static int	huf_uncompress (GetByteContext gb, uint16_t dst, int dst_size)

static void	wdec14 (uint16_t l, uint16_t h, uint16_t a, uint16_t b)

static void	wdec16 (uint16_t l, uint16_t h, uint16_t a, uint16_t b)

static void	wav_decode (uint16_t *in, int nx, int ox, int ny, int oy, uint16_t mx)

static int	piz_uncompress (EXRContext s, const uint8_t src, int ssize, int dsize, EXRThreadData *td)

static int	pxr24_uncompress (EXRContext s, const uint8_t src, int compressed_size, int uncompressed_size, EXRThreadData *td)

static int	decode_block (AVCodecContext avctx, void tdata, int jobnr, int threadnr)

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

static av_cold int	decode_end (AVCodecContext *avctx)

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

Definition in file exr.c.

Macro Definition Documentation

#define USHORT_RANGE (1 << 16)

Definition at line 284 of file exr.c.

Referenced by reverse_lut().

#define BITMAP_SIZE (1 << 13)

Definition at line 285 of file exr.c.

Referenced by piz_uncompress().

#define HUF_ENCBITS 16

Definition at line 311 of file exr.c.

#define HUF_DECBITS 14

Definition at line 312 of file exr.c.

Referenced by huf_build_dec_table(), and huf_decode().

#define HUF_ENCSIZE ((1 << HUF_ENCBITS) + 1)

Definition at line 314 of file exr.c.

Referenced by huf_canonical_code_table(), and huf_uncompress().

#define HUF_DECSIZE (1 << HUF_DECBITS)

Definition at line 315 of file exr.c.

Referenced by huf_uncompress().

#define HUF_DECMASK (HUF_DECSIZE - 1)

Definition at line 316 of file exr.c.

Referenced by huf_decode().

#define SHORT_ZEROCODE_RUN 59

Definition at line 347 of file exr.c.

Referenced by huf_unpack_enc_table().

#define LONG_ZEROCODE_RUN 63

Definition at line 348 of file exr.c.

Referenced by huf_unpack_enc_table().

#define SHORTEST_LONG_RUN (2 + LONG_ZEROCODE_RUN - SHORT_ZEROCODE_RUN)

Definition at line 349 of file exr.c.

Referenced by huf_unpack_enc_table().

#define LONGEST_LONG_RUN (255 + SHORTEST_LONG_RUN)

Definition at line 350 of file exr.c.

#define get_char	(	c,
		lc,
		gb
	)

Value:

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

Definition at line 428 of file exr.c.

Referenced by huf_decode().

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

Value:

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

Definition at line 433 of file exr.c.

Referenced by huf_decode().

#define NBITS 16

Definition at line 588 of file exr.c.

#define A_OFFSET (1 << (NBITS - 1))

Definition at line 589 of file exr.c.

Referenced by wdec16().

#define MOD_MASK ((1 << NBITS) - 1)

Definition at line 590 of file exr.c.

Referenced by wdec16().

Enumeration Type Documentation

enum ExrCompr

Enumerator:

EXR_RAW
EXR_RLE
EXR_ZIP1
EXR_ZIP16
EXR_PIZ
EXR_PXR24
EXR_B44
EXR_B44A

Definition at line 43 of file exr.c.

enum ExrPixelType

Enumerator:

EXR_UINT
EXR_HALF
EXR_FLOAT

Definition at line 54 of file exr.c.

Function Documentation

static uint16_t exr_flt2uint ( uint32_t v )

inlinestatic

Converts from 32-bit float as uint32_t to uint16_t.

Parameters

v	32-bit float

Returns: normalized 16-bit unsigned int

Definition at line 108 of file exr.c.

Referenced by decode_block().

static uint16_t exr_halflt2uint ( uint16_t v )

inlinestatic

Converts from 16-bit float as uint16_t to uint16_t.

Parameters

v	16-bit float

Returns: normalized 16-bit unsigned int

Definition at line 127 of file exr.c.

Referenced by decode_block().

static unsigned int get_header_variable_length	(	const uint8_t **	buf,
		const uint8_t *	buf_end
	)

static

Gets the size of the header variable.

Parameters

**buf	the current pointer location in the header where the variable data starts
*buf_end	pointer location of the end of the buffer

Returns: size of variable data

Definition at line 146 of file exr.c.

Referenced by check_header_variable(), and decode_frame().

static int check_header_variable	(	AVCodecContext *	avctx,
		const uint8_t **	buf,
		const uint8_t *	buf_end,
		const char *	value_name,
		const char *	value_type,
		unsigned int	minimum_length,
		unsigned int *	variable_buffer_data_size
	)

static

Checks if the variable name corresponds with it's data type.

Parameters

*avctx	the AVCodecContext
**buf	the current pointer location in the header where the variable name starts
*buf_end	pointer location of the end of the buffer
*value_name	name of the varible to check
*value_type	type of the varible to check
minimum_length	minimum length of the variable data
variable_buffer_data_size	variable length read from the header after it's checked

Returns: negative if variable is invalid

Definition at line 169 of file exr.c.

Referenced by decode_frame().

static void predictor	(	uint8_t *	src,
		int	size
	)

static

Definition at line 192 of file exr.c.

Referenced by adpcm_compress_trellis(), adpcm_decode_frame(), adpcm_ima_expand_nibble(), adpcm_ima_oki_expand_nibble(), adpcm_ima_qt_expand_nibble(), adpcm_ima_wav_expand_nibble(), adpcm_ms_compress_sample(), adpcm_ms_expand_nibble(), decode_audio_s16(), dpcm_decode_frame(), encode_picture_lossless(), ff_mjpeg_decode_sos(), ljpeg_decode_rgb_scan(), rle_uncompress(), tta_decode_frame(), and zip_uncompress().

static void reorder_pixels	(	uint8_t *	src,
		uint8_t *	dst,
		int	size
	)

static

Definition at line 204 of file exr.c.

Referenced by rle_uncompress(), and zip_uncompress().

static int zip_uncompress	(	const uint8_t *	src,
		int	compressed_size,
		int	uncompressed_size,
		EXRThreadData *	td
	)

static

Definition at line 224 of file exr.c.

Referenced by decode_block().

static int rle_uncompress	(	const uint8_t *	src,
		int	compressed_size,
		int	uncompressed_size,
		EXRThreadData *	td
	)

static

Definition at line 239 of file exr.c.

Referenced by decode_block().

static uint16_t reverse_lut	(	const uint8_t *	bitmap,
		uint16_t *	lut
	)

static

Definition at line 287 of file exr.c.

Referenced by piz_uncompress().

static void apply_lut	(	const uint16_t *	lut,
		uint16_t *	dst,
		int	dsize
	)

static

Definition at line 303 of file exr.c.

Referenced by piz_uncompress().

static void huf_canonical_code_table ( uint64_t * hcode )

static

Definition at line 324 of file exr.c.

Referenced by huf_unpack_enc_table().

static int huf_unpack_enc_table	(	GetByteContext *	gb,
		int32_t	im,
		int32_t	iM,
		uint64_t *	hcode
	)

static

Definition at line 352 of file exr.c.

Referenced by huf_uncompress().

static int huf_build_dec_table	(	const uint64_t *	hcode,
		int	im,
		int	iM,
		HufDec *	hdecod
	)

static

Definition at line 391 of file exr.c.

Referenced by huf_uncompress().

static int huf_decode	(	const uint64_t *	hcode,
		const HufDec *	hdecod,
		GetByteContext *	gb,
		int	nbits,
		int	rlc,
		int	no,
		uint16_t *	out
	)

static

Definition at line 455 of file exr.c.

Referenced by huf_uncompress().

static int huf_uncompress	(	GetByteContext *	gb,
		uint16_t *	dst,
		int	dst_size
	)

static

Definition at line 523 of file exr.c.

Referenced by piz_uncompress().

static void wdec14	(	uint16_t	l,
		uint16_t	h,
		uint16_t *	a,
		uint16_t *	b
	)

inlinestatic

Definition at line 575 of file exr.c.

Referenced by wav_decode().

static void wdec16	(	uint16_t	l,
		uint16_t	h,
		uint16_t *	a,
		uint16_t *	b
	)

inlinestatic

Definition at line 592 of file exr.c.

Referenced by wav_decode().

static void wav_decode	(	uint16_t *	in,
		int	nx,
		int	ox,
		int	ny,
		int	oy,
		uint16_t	mx
	)

static

Definition at line 602 of file exr.c.

Referenced by piz_uncompress().

static int piz_uncompress	(	EXRContext *	s,
		const uint8_t *	src,
		int	ssize,
		int	dsize,
		EXRThreadData *	td
	)

static

Definition at line 681 of file exr.c.

Referenced by decode_block().

static int pxr24_uncompress	(	EXRContext *	s,
		const uint8_t *	src,
		int	compressed_size,
		int	uncompressed_size,
		EXRThreadData *	td
	)

static

Definition at line 739 of file exr.c.

Referenced by decode_block().

static int decode_block	(	AVCodecContext *	avctx,
		void *	tdata,
		int	jobnr,
		int	threadnr
	)

static

Definition at line 794 of file exr.c.

Referenced by decode_frame().

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

static

Definition at line 914 of file exr.c.

static av_cold int decode_end ( AVCodecContext * avctx )

static

Definition at line 1252 of file exr.c.

Variable Documentation

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),
    .close              = decode_end,
    .decode             = decode_frame,
    .capabilities       = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS | CODEC_CAP_SLICE_THREADS,
}

Definition at line 1272 of file exr.c.

Data Structures

Macros

Enumerations

Functions

Variables

Detailed Description

Macro Definition Documentation

Enumeration Type Documentation

Function Documentation

Variable Documentation