exr.c File Reference

OpenEXR decoder. More...

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

Include dependency graph for exr.c:

Go to the source code of this file.

Data Structures
struct	EXRChannel
struct	EXRThreadData
struct	EXRContext

Typedefs
typedef struct EXRChannel	EXRChannel
typedef struct EXRThreadData	EXRThreadData
typedef struct EXRContext	EXRContext

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. More...
static uint16_t	exr_halflt2uint (uint16_t v)
	Converts from 16-bit float as uint16_t to uint16_t. More...
static unsigned int	get_header_variable_length (const uint8_t **buf, const uint8_t *buf_end)
	Gets the size of the header variable. More...
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. More...
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 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.

Typedef Documentation

typedef struct EXRChannel EXRChannel

typedef struct EXRContext EXRContext

typedef struct EXRThreadData EXRThreadData

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 42 of file exr.c.

enum ExrPixelType

Enumerator
EXR_UINT
EXR_HALF
EXR_FLOAT

Definition at line 53 of file exr.c.

Function Documentation

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 165 of file exr.c.

Referenced by decode_frame().

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

static

Definition at line 335 of file exr.c.

Referenced by decode_frame().

static av_cold int decode_end ( AVCodecContext *  avctx )

static

Definition at line 786 of file exr.c.

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

static

Definition at line 452 of file exr.c.

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 104 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 123 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 142 of file exr.c.

Referenced by check_header_variable(), and decode_frame().

static void predictor ( uint8_t *  src, int  size  )

static

Definition at line 188 of file exr.c.

Referenced by adpcm_compress_trellis(), adpcm_decode_frame(), adpcm_encode_frame(), adpcm_ima_expand_nibble(), adpcm_ima_oki_expand_nibble(), adpcm_ima_qt_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 int pxr24_uncompress ( EXRContext *  s, const uint8_t *  src, int  compressed_size, int  uncompressed_size, EXRThreadData *  td  )

static

Definition at line 280 of file exr.c.

Referenced by decode_block().

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

static

Definition at line 200 of file exr.c.

Referenced by rle_uncompress(), and zip_uncompress().

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

static

Definition at line 235 of file exr.c.

Referenced by decode_block().

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

static

Definition at line 220 of file exr.c.

Referenced by decode_block().

Variable Documentation

AVCodec ff_exr_decoder

Initial value:

= {
    .name               = "exr",
    .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,
    .long_name          = NULL_IF_CONFIG_SMALL("OpenEXR image"),
}

Definition at line 804 of file exr.c.