FFmpeg
Data Structures | Macros | Enumerations | Functions | Variables
iff.c File Reference
#include <stdint.h>
#include "libavutil/imgutils.h"
#include "bytestream.h"
#include "avcodec.h"
#include "codec_internal.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, AVFrame *frame, int *got_frame, AVPacket *avpkt)
 

Variables

static const uint64_t plane8_lut [8][256]
 
static const uint32_t plane32_lut [32][16 *4]
 
const FFCodec ff_iff_ilbm_decoder
 

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 72 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 90 of file iff.c.

◆ LUT32

#define LUT32 (   plane)
Value:
{ \
0, 0, 0, 0, \
0, 0, 0, 1U << plane, \
0, 0, 1U << plane, 0, \
0, 0, 1U << plane, 1U << plane, \
0, 1U << plane, 0, 0, \
0, 1U << plane, 0, 1U << plane, \
0, 1U << plane, 1U << plane, 0, \
0, 1U << plane, 1U << plane, 1U << plane, \
1U << plane, 0, 0, 0, \
1U << plane, 0, 0, 1U << plane, \
1U << plane, 0, 1U << plane, 0, \
1U << plane, 0, 1U << plane, 1U << plane, \
1U << plane, 1U << plane, 0, 0, \
1U << plane, 1U << plane, 0, 1U << plane, \
1U << plane, 1U << plane, 1U << plane, 0, \
1U << plane, 1U << plane, 1U << plane, 1U << plane, \
}

Definition at line 115 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 505 of file iff.c.

◆ 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 652 of file iff.c.

◆ GETNIBBLE

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

Enumeration Type Documentation

◆ mask_type

enum mask_type
Enumerator
MASK_NONE 
MASK_HAS_MASK 
MASK_HAS_TRANSPARENT_COLOR 
MASK_LASSO 

Definition at line 40 of file iff.c.

Function Documentation

◆ gray2rgb()

static av_always_inline uint32_t gray2rgb ( const uint32_t  x)
static

Definition at line 147 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 154 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
avctxthe AVCodecContext where to extract extra context to
avpktthe 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 205 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 385 of file iff.c.

◆ decode_init()

static av_cold int decode_init ( AVCodecContext *  avctx)
static

Definition at line 399 of file iff.c.

◆ 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
dstDestination buffer
bufSource buffer
buf_size
planeplane number to decode as

Definition at line 465 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
dstDestination buffer
bufSource buffer
buf_size
planeplane number to decode as

Definition at line 487 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
dstthe destination 24bpp buffer
bufthe source 8bpp chunky buffer
palthe HAM decode table
buf_sizethe plane size in bytes

Definition at line 523 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 538 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
dstthe destination buffer where to store decompressed bitstream
dst_sizethe destination plane size in bytes
bufthe source byterun1 compressed bitstream
buf_endthe EOF of source byterun1 compressed bitstream
Returns
number of consumed bytes in byterun1 compressed bitstream

Definition at line 555 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 582 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]dstDestination buffer
widthWidth of destination buffer (pixels)
heightHeight of destination buffer (pixels)
linesizeLine size of destination buffer (bytes)

Definition at line 679 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]dstDestination buffer
widthWidth of destination buffer (pixels)
heightHeight of destination buffer (pixels)
linesizeLine size of destination buffer (bytes)

Definition at line 696 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]dstDestination buffer
[in]srcSource buffer
src_sizeSource buffer size (bytes)
widthWidth of destination buffer (pixels)
heightHeight of destination buffer (pixels)
linesizeLine size of destination buffer (bytes)

Definition at line 716 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]dstDestination buffer
[in]srcSource buffer
src_sizeSource buffer size (bytes)
widthWidth of destination buffer (pixels)
heightHeight of destination buffer (pixels)
linesizeLine size of destination buffer (bytes)
[int]tvdc TVDC lookup table

Definition at line 768 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 808 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 861 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 928 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 1039 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 1107 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 1193 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 1253 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 1335 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 1394 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 1449 of file iff.c.

Referenced by decode_frame().

◆ unsupported()

static int unsupported ( AVCodecContext *  avctx)
static

Definition at line 1521 of file iff.c.

Referenced by decode_frame(), and txd_decode_frame().

◆ decode_frame()

static int decode_frame ( AVCodecContext *  avctx,
AVFrame *  frame,
int *  got_frame,
AVPacket *  avpkt 
)
static

Definition at line 1528 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 110 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 135 of file iff.c.

Referenced by decodeplane32().

◆ ff_iff_ilbm_decoder

const FFCodec ff_iff_ilbm_decoder
Initial value:
= {
.p.name = "iff",
.p.long_name = NULL_IF_CONFIG_SMALL("IFF ACBM/ANIM/DEEP/ILBM/PBM/RGB8/RGBN"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_IFF_ILBM,
.priv_data_size = sizeof(IffContext),
.init = decode_init,
.close = decode_end,
FF_CODEC_DECODE_CB(decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
}

Definition at line 1909 of file iff.c.

decode_init
static av_cold int decode_init(AVCodecContext *avctx)
Definition: iff.c:399
FF_CODEC_CAP_INIT_CLEANUP
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition: codec_internal.h:39
init
static int init
Definition: av_tx.c:47
LUT32
#define LUT32(plane)
Definition: iff.c:115
AV_CODEC_ID_IFF_ILBM
@ AV_CODEC_ID_IFF_ILBM
Definition: codec_id.h:186
U
#define U(x)
Definition: vp56_arith.h:37
type
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf type
Definition: writing_filters.txt:86
decode_end
static av_cold int decode_end(AVCodecContext *avctx)
Definition: iff.c:385
first
trying all byte sequences megabyte in length and selecting the best looking sequence will yield cases to try But first
Definition: rate_distortion.txt:12
width
#define width
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:254
pixel
uint8_t pixel
Definition: tiny_ssim.c:41
LUT8
#define LUT8(plane)
Definition: iff.c:90
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
AV_LE2NE64C
#define AV_LE2NE64C(x)
Definition: bswap.h:107
decode_frame
static int decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *avpkt)
Definition: iff.c:1528
height
#define height
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
IffContext
Definition: iff.c:47
delta
float delta
Definition: vorbis_enc_data.h:430
FF_CODEC_CAP_INIT_THREADSAFE
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: codec_internal.h:31
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
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