IFF ACBM/DEEP/ILBM/PBM bitmap decoder. More...

#include "libavutil/imgutils.h"
#include "bytestream.h"
#include "avcodec.h"
#include "get_bits.h"
#include "internal.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(pixel_size)

#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	ff_cmap_read_palette (AVCodecContext avctx, uint32_t pal)
	Convert CMAP buffer (stored in extradata) to lavc palette format.

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

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.

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

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.

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, const uint8_t buf, const uint8_t *const buf_end)
	Decode one complete byterun1 encoded line.

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

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

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.

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.

static int	unsupported (AVCodecContext *avctx)

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

static av_cold int	decode_end (AVCodecContext *avctx)

Variables
static const uint64_t	plane8_lut [8][256]

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

Detailed Description

IFF ACBM/DEEP/ILBM/PBM bitmap decoder.

Definition in file iff.c.

Macro Definition Documentation

#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 60 of file iff.c.

#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 78 of file iff.c.

#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 103 of file iff.c.

#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 419 of file iff.c.

Referenced by decode_ham_plane32().

#define DECODE_RGBX_COMMON ( pixel_size )

Value:

if (!length) { \
        length = bytestream2_get_byte(gb); \
        if (!length) { \
            length = bytestream2_get_be16(gb); \
            if (!length) \
                return; \
        } \
    } \
    for (i = 0; i < length; i++) { \
        *(uint32_t *)(dst + y*linesize + x * pixel_size) = pixel; \
        x += 1; \
        if (x >= width) { \
            y += 1; \
            if (y >= height) \
                return; \
            x = 0; \
        } \
    }

Definition at line 491 of file iff.c.

Referenced by decode_rgb8(), and decode_rgbn().

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

Referenced by decode_deep_tvdc32().

Enumeration Type Documentation

enum mask_type

Enumerator:

MASK_NONE
MASK_HAS_MASK
MASK_HAS_TRANSPARENT_COLOR
MASK_LASSO

Definition at line 35 of file iff.c.

Function Documentation

static av_always_inline uint32_t gray2rgb ( const uint32_t x )

static

Definition at line 135 of file iff.c.

Referenced by extract_header(), and ff_cmap_read_palette().

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

static

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

Definition at line 142 of file iff.c.

Referenced by decode_frame().

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 191 of file iff.c.

Referenced by decode_frame(), and decode_init().

static av_cold int decode_init ( AVCodecContext * avctx )

static

Definition at line 323 of file iff.c.

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 380 of file iff.c.

Referenced by decode_frame().

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 401 of file iff.c.

Referenced by decode_frame().

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 437 of file iff.c.

Referenced by decode_frame().

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

static

Definition at line 452 of file iff.c.

Referenced by decode_frame().

static int decode_byterun	(	uint8_t *	dst,
		int	dst_size,
		const uint8_t *	buf,
		const uint8_t *const	buf_end
	)

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 469 of file iff.c.

Referenced by decode_frame().

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 518 of file iff.c.

Referenced by decode_frame().

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 535 of file iff.c.

Referenced by decode_frame().

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 555 of file iff.c.

Referenced by decode_frame().

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)
	int]	tvdc TVDC lookup table

Definition at line 605 of file iff.c.

Referenced by decode_frame().

static int unsupported ( AVCodecContext * avctx )

static

Definition at line 645 of file iff.c.

Referenced by decode_frame(), mov_read_elst(), and txd_decode_frame().

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

static

Definition at line 652 of file iff.c.

static av_cold int decode_end ( AVCodecContext * avctx )

static

Definition at line 861 of file iff.c.

Variable Documentation

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 98 of file iff.c.

Referenced by decodeplane8().

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 123 of file iff.c.

Referenced by decodeplane32().

Data Structures

Macros

Enumerations

Functions

Variables

Detailed Description

Macro Definition Documentation

Enumeration Type Documentation

Function Documentation

Variable Documentation