libavcodec/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"

Go to the source code of this file.

Data Structures
struct	EXRContext
Enumerations
enum	ExrCompr {   EXR_RAW = 0, EXR_RLE = 1, EXR_ZIP1 = 2, EXR_ZIP16 = 3,   EXR_PIZ = 4, EXR_B44 = 6, EXR_B44A = 7 }
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	rle_uncompress (const uint8_t *src, int ssize, uint8_t *dst, int dsize)
static int	decode_frame (AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
static av_cold int	decode_init (AVCodecContext *avctx)
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.

---

Enumeration Type Documentation

enum ExrCompr

Enumerator:

EXR_RAW
EXR_RLE
EXR_ZIP1
EXR_ZIP16
EXR_PIZ
EXR_B44
EXR_B44A

Definition at line 41 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 131 of file exr.c.

Referenced by decode_frame().

static av_cold int decode_end

(

AVCodecContext *

avctx

)

[static]

Definition at line 651 of file exr.c.

static int decode_frame	(	AVCodecContext *	avctx,
		void *	data,
		int *	data_size,
		AVPacket *	avpkt
	)			[static]

Definition at line 224 of file exr.c.

static av_cold int decode_init

(

AVCodecContext *

avctx

)

[static]

Definition at line 639 of file exr.c.

static uint16_t exr_flt2uint

(

uint32_t

v

)

[inline, static]

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 70 of file exr.c.

Referenced by decode_frame().

static uint16_t exr_halflt2uint

(

uint16_t

v

)

[inline, static]

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 89 of file exr.c.

Referenced by decode_frame().

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 108 of file exr.c.

Referenced by check_header_variable(), and decode_frame().

static void predictor	(	uint8_t *	src,
		int	size
	)			[static]

Definition at line 156 of file exr.c.

Referenced by adpcm_compress_trellis(), adpcm_decode_frame(), adpcm_ima_expand_nibble(), adpcm_ima_qt_expand_nibble(), adpcm_ms_compress_sample(), adpcm_ms_expand_nibble(), decode_audio_s16(), decode_frame(), dpcm_decode_frame(), encode_picture_lossless(), ff_mjpeg_decode_sos(), and tta_decode_frame().

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

Definition at line 168 of file exr.c.

Referenced by decode_frame().

static int rle_uncompress	(	const uint8_t *	src,
		int	ssize,
		uint8_t *	dst,
		int	dsize
	)			[static]

Definition at line 188 of file exr.c.

Referenced by decode_frame().

---

Variable Documentation

AVCodec ff_exr_decoder

Initial value:

 {
    .name               = "exr",
    .type               = AVMEDIA_TYPE_VIDEO,
    .id                 = AV_CODEC_ID_EXR,
    .priv_data_size     = sizeof(EXRContext),
    .init               = decode_init,
    .close              = decode_end,
    .decode             = decode_frame,
    .capabilities       = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,
    .long_name          = NULL_IF_CONFIG_SMALL("OpenEXR image"),
}

Definition at line 664 of file exr.c.