IFF ACBM/ANIM/DEEP/ILBM/PBM/RGB8/RGBN bitmap decoder. More...

#include <stdint.h>
#include "libavutil/imgutils.h"
#include "bytestream.h"
#include "avcodec.h"
#include "internal.h"
#include "mathops.h"

Go to the source code of this file.

Data Structures
struct	IffContext

Macros
#define	LUT8_PART(plane, v)

#define	LUT8(plane)

#define	LUT32(plane)

#define	DECODE_HAM_PLANE32(x)

#define	DECODE_RGBX_COMMON(type)

#define	GETNIBBLE ((i & 1) ? (src[i>>1] & 0xF) : (src[i>>1] >> 4))

Enumerations
enum	mask_type { MASK_NONE, MASK_HAS_MASK, MASK_HAS_TRANSPARENT_COLOR, MASK_LASSO }

Functions
static av_always_inline uint32_t	gray2rgb (const uint32_t x)

static int	cmap_read_palette (AVCodecContext avctx, uint32_t pal)
	Convert CMAP buffer (stored in extradata) to lavc palette format. More...

static int	extract_header (AVCodecContext const avctx, const AVPacket const avpkt)
	Extracts the IFF extra context and updates internal decoder structures. More...

static av_cold int	decode_end (AVCodecContext *avctx)

static av_cold int	decode_init (AVCodecContext *avctx)

static void	decodeplane8 (uint8_t dst, const uint8_t buf, int buf_size, int plane)
	Decode interleaved plane buffer up to 8bpp. More...

static void	decodeplane32 (uint32_t dst, const uint8_t buf, int buf_size, int plane)
	Decode interleaved plane buffer up to 24bpp. More...

static void	decode_ham_plane32 (uint32_t dst, const uint8_t buf, const uint32_t *const pal, unsigned buf_size)
	Converts one line of HAM6/8-encoded chunky buffer to 24bpp. More...

static void	lookup_pal_indicies (uint32_t dst, const uint32_t buf, const uint32_t *const pal, unsigned width)

static int	decode_byterun (uint8_t dst, int dst_size, GetByteContext gb)
	Decode one complete byterun1 encoded line. More...

static int	decode_byterun2 (uint8_t dst, int height, int line_size, GetByteContext gb)

static void	decode_rgb8 (GetByteContext gb, uint8_t dst, int width, int height, int linesize)
	Decode RGB8 buffer. More...

static void	decode_rgbn (GetByteContext gb, uint8_t dst, int width, int height, int linesize)
	Decode RGBN buffer. More...

static void	decode_deep_rle32 (uint8_t dst, const uint8_t src, int src_size, int width, int height, int linesize)
	Decode DEEP RLE 32-bit buffer. More...

static void	decode_deep_tvdc32 (uint8_t dst, const uint8_t src, int src_size, int width, int height, int linesize, const int16_t *tvdc)
	Decode DEEP TVDC 32-bit buffer. More...

static void	decode_short_horizontal_delta (uint8_t dst, const uint8_t buf, const uint8_t *buf_end, int w, int bpp, int dst_size)

static void	decode_byte_vertical_delta (uint8_t dst, const uint8_t buf, const uint8_t *buf_end, int w, int xor, int bpp, int dst_size)

static void	decode_delta_j (uint8_t dst, const uint8_t buf, const uint8_t *buf_end, int w, int h, int bpp, int dst_size)

static void	decode_short_vertical_delta (uint8_t dst, const uint8_t buf, const uint8_t *buf_end, int w, int bpp, int dst_size)

static void	decode_long_vertical_delta (uint8_t dst, const uint8_t buf, const uint8_t *buf_end, int w, int bpp, int dst_size)

static void	decode_short_vertical_delta2 (uint8_t dst, const uint8_t buf, const uint8_t *buf_end, int w, int bpp, int dst_size)

static void	decode_long_vertical_delta2 (uint8_t dst, const uint8_t buf, const uint8_t *buf_end, int w, int bpp, int dst_size)

static void	decode_delta_d (uint8_t dst, const uint8_t buf, const uint8_t *buf_end, int w, int flag, int bpp, int dst_size)

static void	decode_delta_e (uint8_t dst, const uint8_t buf, const uint8_t *buf_end, int w, int flag, int bpp, int dst_size)

static void	decode_delta_l (uint8_t dst, const uint8_t buf, const uint8_t *buf_end, int w, int flag, int bpp, int dst_size)

static int	unsupported (AVCodecContext *avctx)

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

Variables
static const uint64_t	plane8_lut [8][256]

static const uint32_t	plane32_lut [32][16 *4]

Detailed Description

IFF ACBM/ANIM/DEEP/ILBM/PBM/RGB8/RGBN bitmap decoder.

Definition in file iff.c.

Macro Definition Documentation

◆ LUT8_PART

#define LUT8_PART	(	plane,
		v
	)

Value:

AV_LE2NE64C(UINT64_C(0x0000000)<<32 | v) << plane,  \
    AV_LE2NE64C(UINT64_C(0x1000000)<<32 | v) << plane,  \
    AV_LE2NE64C(UINT64_C(0x0010000)<<32 | v) << plane,  \
    AV_LE2NE64C(UINT64_C(0x1010000)<<32 | v) << plane,  \
    AV_LE2NE64C(UINT64_C(0x0000100)<<32 | v) << plane,  \
    AV_LE2NE64C(UINT64_C(0x1000100)<<32 | v) << plane,  \
    AV_LE2NE64C(UINT64_C(0x0010100)<<32 | v) << plane,  \
    AV_LE2NE64C(UINT64_C(0x1010100)<<32 | v) << plane,  \
    AV_LE2NE64C(UINT64_C(0x0000001)<<32 | v) << plane,  \
    AV_LE2NE64C(UINT64_C(0x1000001)<<32 | v) << plane,  \
    AV_LE2NE64C(UINT64_C(0x0010001)<<32 | v) << plane,  \
    AV_LE2NE64C(UINT64_C(0x1010001)<<32 | v) << plane,  \
    AV_LE2NE64C(UINT64_C(0x0000101)<<32 | v) << plane,  \
    AV_LE2NE64C(UINT64_C(0x1000101)<<32 | v) << plane,  \
    AV_LE2NE64C(UINT64_C(0x0010101)<<32 | v) << plane,  \
    AV_LE2NE64C(UINT64_C(0x1010101)<<32 | v) << plane

Definition at line 71 of file iff.c.

◆ LUT8

#define LUT8 ( plane )

Value:

{                           \
    LUT8_PART(plane, 0x0000000),                \
    LUT8_PART(plane, 0x1000000),                \
    LUT8_PART(plane, 0x0010000),                \
    LUT8_PART(plane, 0x1010000),                \
    LUT8_PART(plane, 0x0000100),                \
    LUT8_PART(plane, 0x1000100),                \
    LUT8_PART(plane, 0x0010100),                \
    LUT8_PART(plane, 0x1010100),                \
    LUT8_PART(plane, 0x0000001),                \
    LUT8_PART(plane, 0x1000001),                \
    LUT8_PART(plane, 0x0010001),                \
    LUT8_PART(plane, 0x1010001),                \
    LUT8_PART(plane, 0x0000101),                \
    LUT8_PART(plane, 0x1000101),                \
    LUT8_PART(plane, 0x0010101),                \
    LUT8_PART(plane, 0x1010101),                \
}

Definition at line 89 of file iff.c.

◆ LUT32

#define LUT32 ( plane )

Value:

{                                \
             0,          0,          0,          0,   \
             0,          0,          0, 1 << plane,   \
             0,          0, 1 << plane,          0,   \
             0,          0, 1 << plane, 1 << plane,   \
             0, 1 << plane,          0,          0,   \
             0, 1 << plane,          0, 1 << plane,   \
             0, 1 << plane, 1 << plane,          0,   \
             0, 1 << plane, 1 << plane, 1 << plane,   \
    1 << plane,          0,          0,          0,   \
    1 << plane,          0,          0, 1 << plane,   \
    1 << plane,          0, 1 << plane,          0,   \
    1 << plane,          0, 1 << plane, 1 << plane,   \
    1 << plane, 1 << plane,          0,          0,   \
    1 << plane, 1 << plane,          0, 1 << plane,   \
    1 << plane, 1 << plane, 1 << plane,          0,   \
    1 << plane, 1 << plane, 1 << plane, 1 << plane,   \
}

Definition at line 114 of file iff.c.

◆ DECODE_HAM_PLANE32

#define DECODE_HAM_PLANE32 ( x )

Value:

first       = buf[x] << 1;      \
    second      = buf[(x)+1] << 1;  \
    delta      &= pal[first++];     \
    delta      |= pal[first];       \
    dst[x]      = delta;            \
    delta      &= pal[second++];    \
    delta      |= pal[second];      \
    dst[(x)+1]  = delta

Definition at line 483 of file iff.c.

Referenced by decode_ham_plane32().

◆ DECODE_RGBX_COMMON

#define DECODE_RGBX_COMMON ( type )

Value:

if (!length) { \
        length = bytestream2_get_byte(gb); \
        if (!length) { \
            length = bytestream2_get_be16(gb); \
            if (!length) \
                return; \
        } \
    } \
    for (i = 0; i < length; i++) { \
        *(type *)(dst + y*linesize + x * sizeof(type)) = pixel; \
        x += 1; \
        if (x >= width) { \
            y += 1; \
            if (y >= height) \
                return; \
            x = 0; \
        } \
    }

Definition at line 630 of file iff.c.

Referenced by decode_rgb8(), and decode_rgbn().

◆ GETNIBBLE

#define GETNIBBLE ((i & 1) ? (src[i>>1] & 0xF) : (src[i>>1] >> 4))

Referenced by decode_deep_tvdc32().

Enumeration Type Documentation

◆ mask_type

enum mask_type

Enumerator
MASK_NONE
MASK_HAS_MASK
MASK_HAS_TRANSPARENT_COLOR
MASK_LASSO

Definition at line 39 of file iff.c.

Function Documentation

◆ gray2rgb()

static av_always_inline uint32_t gray2rgb ( const uint32_t x )

static

Definition at line 146 of file iff.c.

Referenced by cmap_read_palette(), and extract_header().

◆ cmap_read_palette()

static int cmap_read_palette	(	AVCodecContext *	avctx,
		uint32_t *	pal
	)

static

Convert CMAP buffer (stored in extradata) to lavc palette format.

Definition at line 153 of file iff.c.

Referenced by decode_frame().

◆ extract_header()

static int extract_header	(	AVCodecContext *const	avctx,
		const AVPacket *const	avpkt
	)

static

Extracts the IFF extra context and updates internal decoder structures.

Parameters

avctx	the AVCodecContext where to extract extra context to
avpkt	the AVPacket to extract extra context from or NULL to use avctx

Returns: >= 0 in case of success, a negative error code otherwise

Definition at line 200 of file iff.c.

Referenced by decode_frame(), and decode_init().

◆ decode_end()

static av_cold int decode_end ( AVCodecContext * avctx )

static

Definition at line 368 of file iff.c.

Referenced by decode_frame().

◆ decode_init()

static av_cold int decode_init ( AVCodecContext * avctx )

static

Definition at line 380 of file iff.c.

Referenced by decode_frame().

◆ decodeplane8()

static void decodeplane8	(	uint8_t *	dst,
		const uint8_t *	buf,
		int	buf_size,
		int	plane
	)

static

Decode interleaved plane buffer up to 8bpp.

Parameters

dst	Destination buffer
buf	Source buffer
buf_size
plane	plane number to decode as

Definition at line 444 of file iff.c.

Referenced by decode_frame().

◆ decodeplane32()

static void decodeplane32	(	uint32_t *	dst,
		const uint8_t *	buf,
		int	buf_size,
		int	plane
	)

static

Decode interleaved plane buffer up to 24bpp.

Parameters

dst	Destination buffer
buf	Source buffer
buf_size
plane	plane number to decode as

Definition at line 465 of file iff.c.

Referenced by decode_frame().

◆ decode_ham_plane32()

static void decode_ham_plane32	(	uint32_t *	dst,
		const uint8_t *	buf,
		const uint32_t *const	pal,
		unsigned	buf_size
	)

static

Converts one line of HAM6/8-encoded chunky buffer to 24bpp.

Parameters

dst	the destination 24bpp buffer
buf	the source 8bpp chunky buffer
pal	the HAM decode table
buf_size	the plane size in bytes

Definition at line 501 of file iff.c.

Referenced by decode_frame().

◆ lookup_pal_indicies()

static void lookup_pal_indicies	(	uint32_t *	dst,
		const uint32_t *	buf,
		const uint32_t *const	pal,
		unsigned	width
	)

static

Definition at line 516 of file iff.c.

Referenced by decode_frame().

◆ decode_byterun()

static int decode_byterun	(	uint8_t *	dst,
		int	dst_size,
		GetByteContext *	gb
	)

static

Decode one complete byterun1 encoded line.

Parameters

dst	the destination buffer where to store decompressed bitstream
dst_size	the destination plane size in bytes
buf	the source byterun1 compressed bitstream
buf_end	the EOF of source byterun1 compressed bitstream

Returns: number of consumed bytes in byterun1 compressed bitstream

Definition at line 533 of file iff.c.

Referenced by decode_frame().

◆ decode_byterun2()

static int decode_byterun2	(	uint8_t *	dst,
		int	height,
		int	line_size,
		GetByteContext *	gb
	)

static

Definition at line 560 of file iff.c.

Referenced by decode_frame().

◆ decode_rgb8()

static void decode_rgb8	(	GetByteContext *	gb,
		uint8_t *	dst,
		int	width,
		int	height,
		int	linesize
	)

static

Decode RGB8 buffer.

Parameters

[out]	dst	Destination buffer
	width	Width of destination buffer (pixels)
	height	Height of destination buffer (pixels)
	linesize	Line size of destination buffer (bytes)

Definition at line 657 of file iff.c.

Referenced by decode_frame().

◆ decode_rgbn()

static void decode_rgbn	(	GetByteContext *	gb,
		uint8_t *	dst,
		int	width,
		int	height,
		int	linesize
	)

static

Decode RGBN buffer.

Parameters

[out]	dst	Destination buffer
	width	Width of destination buffer (pixels)
	height	Height of destination buffer (pixels)
	linesize	Line size of destination buffer (bytes)

Definition at line 674 of file iff.c.

Referenced by decode_frame().

◆ decode_deep_rle32()

static void decode_deep_rle32	(	uint8_t *	dst,
		const uint8_t *	src,
		int	src_size,
		int	width,
		int	height,
		int	linesize
	)

static

Decode DEEP RLE 32-bit buffer.

Parameters

[out]	dst	Destination buffer
[in]	src	Source buffer
	src_size	Source buffer size (bytes)
	width	Width of destination buffer (pixels)
	height	Height of destination buffer (pixels)
	linesize	Line size of destination buffer (bytes)

Definition at line 694 of file iff.c.

Referenced by decode_frame().

◆ decode_deep_tvdc32()

static void decode_deep_tvdc32	(	uint8_t *	dst,
		const uint8_t *	src,
		int	src_size,
		int	width,
		int	height,
		int	linesize,
		const int16_t *	tvdc
	)

static

Decode DEEP TVDC 32-bit buffer.

Parameters

[out]	dst	Destination buffer
[in]	src	Source buffer
	src_size	Source buffer size (bytes)
	width	Width of destination buffer (pixels)
	height	Height of destination buffer (pixels)
	linesize	Line size of destination buffer (bytes)

Definition at line 744 of file iff.c.

Referenced by decode_frame().

◆ decode_short_horizontal_delta()

static void decode_short_horizontal_delta	(	uint8_t *	dst,
		const uint8_t *	buf,
		const uint8_t *	buf_end,
		int	w,
		int	bpp,
		int	dst_size
	)

static

Definition at line 784 of file iff.c.

Referenced by decode_frame().

◆ decode_byte_vertical_delta()

static void decode_byte_vertical_delta	(	uint8_t *	dst,
		const uint8_t *	buf,
		const uint8_t *	buf_end,
		int	w,
		int	xor,
		int	bpp,
		int	dst_size
	)

static

Definition at line 837 of file iff.c.

Referenced by decode_frame().

◆ decode_delta_j()

static void decode_delta_j	(	uint8_t *	dst,
		const uint8_t *	buf,
		const uint8_t *	buf_end,
		int	w,
		int	h,
		int	bpp,
		int	dst_size
	)

static

Definition at line 904 of file iff.c.

Referenced by decode_frame().

◆ decode_short_vertical_delta()

static void decode_short_vertical_delta	(	uint8_t *	dst,
		const uint8_t *	buf,
		const uint8_t *	buf_end,
		int	w,
		int	bpp,
		int	dst_size
	)

static

Definition at line 1015 of file iff.c.

Referenced by decode_frame().

◆ decode_long_vertical_delta()

static void decode_long_vertical_delta	(	uint8_t *	dst,
		const uint8_t *	buf,
		const uint8_t *	buf_end,
		int	w,
		int	bpp,
		int	dst_size
	)

static

Definition at line 1083 of file iff.c.

Referenced by decode_frame().

◆ decode_short_vertical_delta2()

static void decode_short_vertical_delta2	(	uint8_t *	dst,
		const uint8_t *	buf,
		const uint8_t *	buf_end,
		int	w,
		int	bpp,
		int	dst_size
	)

static

Definition at line 1166 of file iff.c.

Referenced by decode_frame().

◆ decode_long_vertical_delta2()

static void decode_long_vertical_delta2	(	uint8_t *	dst,
		const uint8_t *	buf,
		const uint8_t *	buf_end,
		int	w,
		int	bpp,
		int	dst_size
	)

static

Definition at line 1226 of file iff.c.

Referenced by decode_frame().

◆ decode_delta_d()

static void decode_delta_d	(	uint8_t *	dst,
		const uint8_t *	buf,
		const uint8_t *	buf_end,
		int	w,
		int	flag,
		int	bpp,
		int	dst_size
	)

static

Definition at line 1305 of file iff.c.

Referenced by decode_frame().

◆ decode_delta_e()

static void decode_delta_e	(	uint8_t *	dst,
		const uint8_t *	buf,
		const uint8_t *	buf_end,
		int	w,
		int	flag,
		int	bpp,
		int	dst_size
	)

static

Definition at line 1360 of file iff.c.

Referenced by decode_frame().

◆ decode_delta_l()

static void decode_delta_l	(	uint8_t *	dst,
		const uint8_t *	buf,
		const uint8_t *	buf_end,
		int	w,
		int	flag,
		int	bpp,
		int	dst_size
	)

static

Definition at line 1415 of file iff.c.

Referenced by decode_frame().

◆ unsupported()

static int unsupported ( AVCodecContext * avctx )

static

Definition at line 1482 of file iff.c.

Referenced by decode_frame(), and txd_decode_frame().

◆ decode_frame()

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

static

Definition at line 1489 of file iff.c.

Variable Documentation

◆ plane8_lut

const uint64_t plane8_lut[8][256]

static

Initial value:

= {
    LUT8(0), LUT8(1), LUT8(2), LUT8(3),
    LUT8(4), LUT8(5), LUT8(6), LUT8(7),
}

Definition at line 109 of file iff.c.

Referenced by decodeplane8().

◆ plane32_lut

const uint32_t plane32_lut[32][16 *4]

static

Initial value:

= {
    LUT32( 0), LUT32( 1), LUT32( 2), LUT32( 3),
    LUT32( 4), LUT32( 5), LUT32( 6), LUT32( 7),
    LUT32( 8), LUT32( 9), LUT32(10), LUT32(11),
    LUT32(12), LUT32(13), LUT32(14), LUT32(15),
    LUT32(16), LUT32(17), LUT32(18), LUT32(19),
    LUT32(20), LUT32(21), LUT32(22), LUT32(23),
    LUT32(24), LUT32(25), LUT32(26), LUT32(27),
    LUT32(28), LUT32(29), LUT32(30), LUT32(31),
}

Definition at line 134 of file iff.c.

Referenced by decodeplane32().

Data Structures

Macros

Enumerations

Functions

Variables

Detailed Description

Macro Definition Documentation

◆ LUT8_PART

◆ LUT8

◆ LUT32

◆ DECODE_HAM_PLANE32

◆ DECODE_RGBX_COMMON

◆ GETNIBBLE

Enumeration Type Documentation

◆ mask_type

Function Documentation

◆ gray2rgb()

◆ cmap_read_palette()

◆ extract_header()

◆ decode_end()

◆ decode_init()

◆ decodeplane8()

◆ decodeplane32()

◆ decode_ham_plane32()

◆ lookup_pal_indicies()

◆ decode_byterun()

◆ decode_byterun2()

◆ decode_rgb8()

◆ decode_rgbn()

◆ decode_deep_rle32()

◆ decode_deep_tvdc32()

◆ decode_short_horizontal_delta()

◆ decode_byte_vertical_delta()

◆ decode_delta_j()

◆ decode_short_vertical_delta()

◆ decode_long_vertical_delta()

◆ decode_short_vertical_delta2()

◆ decode_long_vertical_delta2()

◆ decode_delta_d()

◆ decode_delta_e()

◆ decode_delta_l()

◆ unsupported()

◆ decode_frame()

Variable Documentation

◆ plane8_lut

◆ plane32_lut