ktxenc.c File Reference

KTX 1.0 muxer for ASTC textures. More...

#include "avformat.h"
#include "avio.h"
#include "mux.h"
#include "libavcodec/defs.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/opt.h"

Go to the source code of this file.

Data Structures
struct	KTXMuxerContext

Macros
#define	ASTC_HEADER_SIZE   16
#define	OFFSET(x)
#define	VE   AV_OPT_FLAG_ENCODING_PARAM

Functions
static int	ktx_orientation_from_side_data (AVFormatContext *s, AVStream *st, int *hflip, int *vflip)
static int	ktx_write_header (AVFormatContext *s)
static int	ktx_write_packet (AVFormatContext *s, AVPacket *pkt)

Variables
static const uint8_t	astc_magic [4] = { 0x13, 0xAB, 0xA1, 0x5C }
static const int	astc_gl_linear [14]
static const int	astc_gl_srgb [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 }
static const char	ktx_orientation_key [] = "KTXorientation"
static const AVOption	ktx_options []
static const AVClass	ktx_muxer_class
const FFOutputFormat	ff_ktx_muxer

Detailed Description

KTX 1.0 muxer for ASTC textures.

Writes the KTX 1.0 header (64 bytes) followed by a uint32 image size and the raw ASTC bitstream. The block size is recovered from the encoder's .astc-style extradata; the sRGB vs linear GL enum is chosen by the "srgb" muxer option.

Definition in file ktxenc.c.

Macro Definition Documentation

ASTC_HEADER_SIZE

#define ASTC_HEADER_SIZE   16

Definition at line 39 of file ktxenc.c.

OFFSET

#define OFFSET

(

x

)

Value:

offsetof(KTXMuxerContext, x)

Definition at line 262 of file ktxenc.c.

VE

#define VE   AV_OPT_FLAG_ENCODING_PARAM

Definition at line 263 of file ktxenc.c.

Function Documentation

ktx_orientation_from_side_data()

static int ktx_orientation_from_side_data ( AVFormatContext * s, AVStream * st, int * hflip, int * vflip )

static

Definition at line 70 of file ktxenc.c.

Referenced by ktx_write_header().

ktx_write_header()

static int ktx_write_header ( AVFormatContext * s )

static

Definition at line 103 of file ktxenc.c.

ktx_write_packet()

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

static

Definition at line 244 of file ktxenc.c.

Variable Documentation

astc_magic

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

static

Definition at line 40 of file ktxenc.c.

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 44 of file ktxenc.c.

astc_gl_srgb

const int astc_gl_srgb[14]

static

Initial value:

= {
    0x93D0, 0x93D1, 0x93D2, 0x93D3, 0x93D4, 0x93D5, 0x93D6, 0x93D7,
    0x93D8, 0x93D9, 0x93DA, 0x93DB, 0x93DC, 0x93DD
}

Definition at line 48 of file ktxenc.c.

Referenced by 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 53 of file ktxenc.c.

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 54 of file ktxenc.c.

ktx_orientation_key

const char ktx_orientation_key[] = "KTXorientation"

static

Definition at line 62 of file ktxenc.c.

Referenced by ktx_write_header().

ktx_options

const AVOption ktx_options[]

static

Initial value:

= {
    { "srgb", "GL internal format color space", OFFSET(srgb),
      AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, VE, .unit = "srgb" },
    { "auto",   "Follow the encoder profile",   0, AV_OPT_TYPE_CONST, { .i64 = -1 }, 0, 0, VE, .unit = "srgb" },
    { "linear", "Write the linear ASTC format", 0, AV_OPT_TYPE_CONST, { .i64 =  0 }, 0, 0, VE, .unit = "srgb" },
    { "srgb",   "Write the sRGB ASTC format",   0, AV_OPT_TYPE_CONST, { .i64 =  1 }, 0, 0, VE, .unit = "srgb" },
    { NULL },
}

Definition at line 264 of file ktxenc.c.

ktx_muxer_class

const AVClass ktx_muxer_class

static

Initial value:

= {
    .class_name = "ktx_muxer",
    .item_name  = av_default_item_name,
    .option     = ktx_options,
    .version    = LIBAVUTIL_VERSION_INT,
}

Definition at line 273 of file ktxenc.c.

ff_ktx_muxer

const FFOutputFormat ff_ktx_muxer

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.audio_codec  = AV_CODEC_ID_NONE,
    .p.video_codec  = AV_CODEC_ID_ASTC,
    .p.subtitle_codec = AV_CODEC_ID_NONE,
    .flags_internal = FF_OFMT_FLAG_MAX_ONE_OF_EACH |
                      FF_OFMT_FLAG_ONLY_DEFAULT_CODECS,
    .priv_data_size = sizeof(KTXMuxerContext),
    .p.priv_class   = &ktx_muxer_class,
    .write_header   = ktx_write_header,
    .write_packet   = ktx_write_packet,
    .p.flags        = AVFMT_NOTIMESTAMPS,
}

Definition at line 280 of file ktxenc.c.