ktxdec.c File Reference

KTX 1.0 demuxer for ASTC textures. More...

#include "config_components.h"
#include <inttypes.h>
#include <limits.h>
#include "libavcodec/defs.h"
#include "avformat.h"
#include "avio.h"
#include "avio_internal.h"
#include "demux.h"
#include "internal.h"
#include "libavutil/display.h"
#include "libavutil/intreadwrite.h"

Go to the source code of this file.

Data Structures
struct	KTXDemuxerContext

Macros
#define	ASTC_HEADER_SIZE   16

Functions
static int	gl_enum_to_block (uint32_t e, int *bx, int *by)
static int	ktx_probe (const AVProbeData *p)
static void	ktx_orientation_flips (const char *value, int *hflip, int *vflip)
static int	ktx_read_orientation (AVFormatContext *s, uint32_t kvdata, int *hflip, int *vflip)
static int	ktx_read_header (AVFormatContext *s)
static int	ktx_read_packet (AVFormatContext *s, AVPacket *pkt)

Variables
static const uint8_t	astc_magic [4] = { 0x13, 0xAB, 0xA1, 0x5C }
static const uint8_t	ktx_magic [12]
static const int	astc_gl_linear [14]
static const int	astc_bx [14] = { 4, 5, 5, 6, 6, 8, 8, 8, 10, 10, 10, 10, 12, 12 }
static const int	astc_by [14] = { 4, 4, 5, 5, 6, 5, 6, 8, 5, 6, 8, 10, 10, 12 }
const FFInputFormat	ff_ktx_demuxer

Detailed Description

KTX 1.0 demuxer for ASTC textures.

Parses the KTX 1.0 header, recovers the ASTC block size from the GL internal format enum, and synthesizes a 16-byte .astc-style extradata for the decoder. The raw ASTC bitstream is emitted as a single packet.

Definition in file ktxdec.c.

Macro Definition Documentation

ASTC_HEADER_SIZE

#define ASTC_HEADER_SIZE   16

Definition at line 45 of file ktxdec.c.

Function Documentation

gl_enum_to_block()

static int gl_enum_to_block ( uint32_t e, int * bx, int * by )

static

Definition at line 65 of file ktxdec.c.

Referenced by ktx_probe(), and ktx_read_header().

ktx_probe()

static int ktx_probe ( const AVProbeData * p )

static

Definition at line 78 of file ktxdec.c.

ktx_orientation_flips()

static void ktx_orientation_flips ( const char * value, int * hflip, int * vflip )

static

Definition at line 99 of file ktxdec.c.

Referenced by ktx_read_orientation().

ktx_read_orientation()

static int ktx_read_orientation ( AVFormatContext * s, uint32_t kvdata, int * hflip, int * vflip )

static

Definition at line 116 of file ktxdec.c.

Referenced by ktx_read_header().

ktx_read_header()

static int ktx_read_header ( AVFormatContext * s )

static

Definition at line 171 of file ktxdec.c.

ktx_read_packet()

static int ktx_read_packet ( AVFormatContext * s, AVPacket * pkt )

static

Definition at line 301 of file ktxdec.c.

Variable Documentation

astc_magic

const uint8_t astc_magic[4] = { 0x13, 0xAB, 0xA1, 0x5C }

static

Definition at line 46 of file ktxdec.c.

ktx_magic

const uint8_t ktx_magic[12]

static

Initial value:

= {
    0xAB, 'K', 'T', 'X', ' ', '1', '1', 0xBB, 0x0D, 0x0A, 0x1A, 0x0A
}

Definition at line 47 of file ktxdec.c.

Referenced by ktx_probe(), and ktx_read_header().

astc_gl_linear

const int astc_gl_linear[14]

static

Initial value:

= {
    0x93B0, 0x93B1, 0x93B2, 0x93B3, 0x93B4, 0x93B5, 0x93B6, 0x93B7,
    0x93B8, 0x93B9, 0x93BA, 0x93BB, 0x93BC, 0x93BD
}

Definition at line 52 of file ktxdec.c.

Referenced by gl_enum_to_block(), and ktx_write_header().

astc_bx

const int astc_bx[14] = { 4, 5, 5, 6, 6, 8, 8, 8, 10, 10, 10, 10, 12, 12 }

static

Definition at line 56 of file ktxdec.c.

Referenced by gl_enum_to_block(), and ktx_write_header().

astc_by

const int astc_by[14] = { 4, 4, 5, 5, 6, 5, 6, 8, 5, 6, 8, 10, 10, 12 }

static

Definition at line 57 of file ktxdec.c.

Referenced by gl_enum_to_block(), and ktx_write_header().

ff_ktx_demuxer

const FFInputFormat ff_ktx_demuxer

Initial value:

= {
    .p.name         = "ktx",
    .p.long_name    = NULL_IF_CONFIG_SMALL("KTX 1.0 (Khronos Texture) for ASTC"),
    .p.mime_type    = "image/ktx",
    .p.extensions   = "ktx",
    .p.flags        = AVFMT_NOTIMESTAMPS,
    .priv_data_size = sizeof(KTXDemuxerContext),
    .read_probe     = ktx_probe,
    .read_header    = ktx_read_header,
    .read_packet    = ktx_read_packet,
}

Definition at line 338 of file ktxdec.c.