#include <inttypes.h>
#include <zlib.h>
#include "libavutil/imgutils.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mem_internal.h"
#include "avcodec.h"
#include "blockdsp.h"
#include "bytestream.h"
#include "elsdec.h"
#include "get_bits.h"
#include "idctdsp.h"
#include "internal.h"
#include "jpegtables.h"
#include "mjpeg.h"
#include "mjpegdec.h"

Data Structures
struct	ePICPixListElem

struct	ePICPixHashElem

struct	ePICPixHash

struct	ePICContext

struct	JPGContext

struct	G2MContext

Macros
#define	EPIC_PIX_STACK_SIZE 1024

#define	EPIC_PIX_STACK_MAX (EPIC_PIX_STACK_SIZE - 1)

#define	EPIC_HASH_SIZE 256

#define	LOAD_NEIGHBOURS(x)

#define	UPDATE_NEIGHBOURS(x)

#define	R_shift 16

#define	G_shift 8

#define	B_shift 0

#define	TOSIGNED(val) (((val) >> 1) ^ -((val) & 1))

#define	APPLY_ALPHA(src, new, alpha) src = (src * (256 - alpha) + new * alpha) >> 8

Enumerations
enum	ChunkType { DISPLAY_INFO = 0xC8, TILE_DATA, CURSOR_POS, CURSOR_SHAPE, CHUNK_CC, CHUNK_CD, CHUNK_TYPE_DATA = 0x4424, CHUNK_TYPE_ASF_HEADER = 0x4824, CHUNK_TYPE_END = 0x4524, CHUNK_TYPE_STREAM_CHANGE = 0x4324 }

enum	Compression { COMPR_EPIC_J_B = 2, COMPR_KEMPF_J_B }

Functions
static av_cold int	jpg_init (AVCodecContext avctx, JPGContext c)

static av_cold void	jpg_free_context (JPGContext *ctx)

static void	jpg_unescape (const uint8_t src, int src_size, uint8_t dst, int *dst_size)

static int	jpg_decode_block (JPGContext c, GetBitContext gb, int plane, int16_t *block)

static void	yuv2rgb (uint8_t *out, int ridx, int Y, int U, int V)

static int	jpg_decode_data (JPGContext c, int width, int height, const uint8_t src, int src_size, uint8_t dst, int dst_stride, const uint8_t mask, int mask_stride, int num_mbs, int swapuv)

static int	djb2_hash (uint32_t key)

static void	epic_hash_init (ePICPixHash *hash)

static ePICPixHashElem *	epic_hash_find (const ePICPixHash *hash, uint32_t key)

static ePICPixHashElem *	epic_hash_add (ePICPixHash *hash, uint32_t key)

static int	epic_add_pixel_to_cache (ePICPixHash *hash, uint32_t key, uint32_t pix)

static int	epic_cache_entries_for_pixel (const ePICPixHash *hash, uint32_t pix)

static void	epic_free_pixel_cache (ePICPixHash *hash)

static int	is_pixel_on_stack (const ePICContext *dc, uint32_t pix)

static int	epic_decode_component_pred (ePICContext *dc, int N, int W, int NW)

static uint32_t	epic_decode_pixel_pred (ePICContext dc, int x, int y, const uint32_t curr_row, const uint32_t *above_row)

static int	epic_predict_pixel (ePICContext dc, uint8_t rung, uint32_t *pPix, uint32_t pix)

static int	epic_handle_edges (ePICContext dc, int x, int y, const uint32_t curr_row, const uint32_t above_row, uint32_t pPix)

static int	epic_decode_run_length (ePICContext dc, int x, int y, int tile_width, const uint32_t curr_row, const uint32_t above_row, const uint32_t above2_row, uint32_t pPix, int pRun)

static int	epic_predict_pixel2 (ePICContext dc, uint8_t rung, uint32_t *pPix, uint32_t pix)

static int	epic_predict_from_NW_NE (ePICContext dc, int x, int y, int run, int tile_width, const uint32_t curr_row, const uint32_t above_row, uint32_t pPix)

static int	epic_decode_from_cache (ePICContext dc, uint32_t W, uint32_t pPix)

static int	epic_decode_tile (ePICContext dc, uint8_t out, int tile_height, int tile_width, int stride)

static int	epic_jb_decode_tile (G2MContext c, int tile_x, int tile_y, const uint8_t src, size_t src_size, AVCodecContext *avctx)

static int	kempf_restore_buf (const uint8_t src, int len, uint8_t dst, int stride, const uint8_t jpeg_tile, int tile_stride, int width, int height, const uint8_t pal, int npal, int tidx)

static int	kempf_decode_tile (G2MContext c, int tile_x, int tile_y, const uint8_t src, int src_size)

static int	g2m_init_buffers (G2MContext *c)

static int	g2m_load_cursor (AVCodecContext avctx, G2MContext c, GetByteContext *gb)

static void	g2m_paint_cursor (G2MContext c, uint8_t dst, int stride)

static int	g2m_decode_frame (AVCodecContext avctx, void data, int got_picture_ptr, AVPacket avpkt)

static av_cold int	g2m_decode_init (AVCodecContext *avctx)

static av_cold int	g2m_decode_end (AVCodecContext *avctx)

Variables
static const uint8_t	luma_quant [64]

static const uint8_t	chroma_quant [64]

const AVCodec	ff_g2m_decoder

Detailed Description

Go2Webinar / Go2Meeting decoder

Definition in file g2meet.c.

Macro Definition Documentation

◆ EPIC_PIX_STACK_SIZE

#define EPIC_PIX_STACK_SIZE 1024

Definition at line 46 of file g2meet.c.

◆ EPIC_PIX_STACK_MAX

#define EPIC_PIX_STACK_MAX (EPIC_PIX_STACK_SIZE - 1)

Definition at line 47 of file g2meet.c.

◆ EPIC_HASH_SIZE

#define EPIC_HASH_SIZE 256

Definition at line 96 of file g2meet.c.

◆ LOAD_NEIGHBOURS

#define LOAD_NEIGHBOURS ( x )

Value:

    W   = curr_row[(x)   - 1];  \
    N   = above_row[(x)];       \
    WW  = curr_row[(x)   - 2];  \
    NW  = above_row[(x)  - 1];  \
    NE  = above_row[(x)  + 1];  \
    NN  = above2_row[(x)];      \
    NNW = above2_row[(x) - 1];  \
    NWW = above_row[(x)  - 2];  \
    NNE = above2_row[(x) + 1]

Definition at line 351 of file g2meet.c.

◆ UPDATE_NEIGHBOURS

#define UPDATE_NEIGHBOURS ( x )

Value:

    NNW = NN;                   \
    NN  = NNE;                  \
    NWW = NW;                   \
    NW  = N;                    \
    N   = NE;                   \
    NE  = above_row[(x)  + 1];  \
    NNE = above2_row[(x) + 1]

Definition at line 362 of file g2meet.c.

◆ R_shift

#define R_shift 16

Definition at line 371 of file g2meet.c.

◆ G_shift

#define G_shift 8

Definition at line 372 of file g2meet.c.

◆ B_shift

#define B_shift 0

Definition at line 373 of file g2meet.c.

◆ TOSIGNED

#define TOSIGNED ( val ) (((val) >> 1) ^ -((val) & 1))

Definition at line 490 of file g2meet.c.

◆ APPLY_ALPHA

#define APPLY_ALPHA	(	src,
		new,
		alpha
	)	src = (src * (256 - alpha) + new * alpha) >> 8

Definition at line 1322 of file g2meet.c.

Enumeration Type Documentation

◆ ChunkType

enum ChunkType

Enumerator
DISPLAY_INFO
TILE_DATA
CURSOR_POS
CURSOR_SHAPE
CHUNK_CC
CHUNK_CD
CHUNK_TYPE_DATA
CHUNK_TYPE_ASF_HEADER
CHUNK_TYPE_END
CHUNK_TYPE_STREAM_CHANGE

Definition at line 49 of file g2meet.c.

◆ Compression

enum Compression

Enumerator
COMPR_EPIC_J_B
COMPR_KEMPF_J_B

Definition at line 58 of file g2meet.c.

Function Documentation

◆ jpg_init()

static av_cold int jpg_init	(	AVCodecContext *	avctx,
		JPGContext *	c
	)

static

Definition at line 163 of file g2meet.c.

Referenced by g2m_decode_init().

◆ jpg_free_context()

static av_cold void jpg_free_context ( JPGContext * ctx )

static

Definition at line 192 of file g2meet.c.

Referenced by g2m_decode_end(), and g2m_decode_init().

◆ jpg_unescape()

static void jpg_unescape	(	const uint8_t *	src,
		int	src_size,
		uint8_t *	dst,
		int *	dst_size
	)

static

Definition at line 204 of file g2meet.c.

Referenced by jpg_decode_data().

◆ jpg_decode_block()

static int jpg_decode_block	(	JPGContext *	c,
		GetBitContext *	gb,
		int	plane,
		int16_t *	block
	)

static

Definition at line 221 of file g2meet.c.

Referenced by jpg_decode_data().

◆ yuv2rgb()

static void yuv2rgb	(	uint8_t *	out,
		int	ridx,
		int	Y,
		int	U,
		int	V
	)

inlinestatic

Definition at line 261 of file g2meet.c.

Referenced by create_filtergraph(), jpg_decode_data(), and tonemap_opencl_init().

◆ jpg_decode_data()

static int jpg_decode_data	(	JPGContext *	c,
		int	width,
		int	height,
		const uint8_t *	src,
		int	src_size,
		uint8_t *	dst,
		int	dst_stride,
		const uint8_t *	mask,
		int	mask_stride,
		int	num_mbs,
		int	swapuv
	)

static

Definition at line 268 of file g2meet.c.

Referenced by epic_jb_decode_tile(), and kempf_decode_tile().

◆ djb2_hash()

static int djb2_hash ( uint32_t key )

static

Definition at line 376 of file g2meet.c.

Referenced by epic_hash_add(), and epic_hash_find().

◆ epic_hash_init()

static void epic_hash_init ( ePICPixHash * hash )

static

Definition at line 388 of file g2meet.c.

Referenced by epic_jb_decode_tile().

◆ epic_hash_find()

static ePICPixHashElem* epic_hash_find	(	const ePICPixHash *	hash,
		uint32_t	key
	)

static

Definition at line 393 of file g2meet.c.

Referenced by epic_add_pixel_to_cache(), epic_cache_entries_for_pixel(), and epic_decode_from_cache().

◆ epic_hash_add()

static ePICPixHashElem* epic_hash_add	(	ePICPixHash *	hash,
		uint32_t	key
	)

static

Definition at line 405 of file g2meet.c.

Referenced by epic_add_pixel_to_cache().

◆ epic_add_pixel_to_cache()

static int epic_add_pixel_to_cache	(	ePICPixHash *	hash,
		uint32_t	key,
		uint32_t	pix
	)

static

Definition at line 428 of file g2meet.c.

Referenced by epic_decode_tile().

◆ epic_cache_entries_for_pixel()

static int epic_cache_entries_for_pixel	(	const ePICPixHash *	hash,
		uint32_t	pix
	)

inlinestatic

Definition at line 449 of file g2meet.c.

Referenced by epic_decode_tile().

◆ epic_free_pixel_cache()

static void epic_free_pixel_cache ( ePICPixHash * hash )

static

Definition at line 460 of file g2meet.c.

Referenced by epic_jb_decode_tile().

◆ is_pixel_on_stack()

static int is_pixel_on_stack	(	const ePICContext *	dc,
		uint32_t	pix
	)

inlinestatic

Definition at line 479 of file g2meet.c.

Referenced by epic_decode_from_cache(), epic_decode_run_length(), epic_decode_tile(), and epic_predict_from_NW_NE().

◆ epic_decode_component_pred()

static int epic_decode_component_pred	(	ePICContext *	dc,
		int	N,
		int	W,
		int	NW
	)

inlinestatic

Definition at line 492 of file g2meet.c.

Referenced by epic_decode_pixel_pred().

◆ epic_decode_pixel_pred()

static uint32_t epic_decode_pixel_pred	(	ePICContext *	dc,
		int	x,
		int	y,
		const uint32_t *	curr_row,
		const uint32_t *	above_row
	)

static

Definition at line 499 of file g2meet.c.

Referenced by epic_decode_tile().

◆ epic_predict_pixel()

static int epic_predict_pixel	(	ePICContext *	dc,
		uint8_t *	rung,
		uint32_t *	pPix,
		uint32_t	pix
	)

static

Definition at line 551 of file g2meet.c.

Referenced by epic_handle_edges().

◆ epic_handle_edges()

static int epic_handle_edges	(	ePICContext *	dc,
		int	x,
		int	y,
		const uint32_t *	curr_row,
		const uint32_t *	above_row,
		uint32_t *	pPix
	)

static

Definition at line 562 of file g2meet.c.

Referenced by epic_decode_tile().

◆ epic_decode_run_length()

static int epic_decode_run_length	(	ePICContext *	dc,
		int	x,
		int	y,
		int	tile_width,
		const uint32_t *	curr_row,
		const uint32_t *	above_row,
		const uint32_t *	above2_row,
		uint32_t *	pPix,
		int *	pRun
	)

static

Definition at line 593 of file g2meet.c.

Referenced by epic_decode_tile().

◆ epic_predict_pixel2()

static int epic_predict_pixel2	(	ePICContext *	dc,
		uint8_t *	rung,
		uint32_t *	pPix,
		uint32_t	pix
	)

static

Definition at line 728 of file g2meet.c.

Referenced by epic_predict_from_NW_NE().

◆ epic_predict_from_NW_NE()

static int epic_predict_from_NW_NE	(	ePICContext *	dc,
		int	x,
		int	y,
		int	run,
		int	tile_width,
		const uint32_t *	curr_row,
		const uint32_t *	above_row,
		uint32_t *	pPix
	)

static

Definition at line 739 of file g2meet.c.

Referenced by epic_decode_tile().

◆ epic_decode_from_cache()

static int epic_decode_from_cache	(	ePICContext *	dc,
		uint32_t	W,
		uint32_t *	pPix
	)

static

Definition at line 767 of file g2meet.c.

Referenced by epic_decode_tile().

◆ epic_decode_tile()

static int epic_decode_tile	(	ePICContext *	dc,
		uint8_t *	out,
		int	tile_height,
		int	tile_width,
		int	stride
	)

static

Definition at line 796 of file g2meet.c.

Referenced by epic_jb_decode_tile().

◆ epic_jb_decode_tile()

static int epic_jb_decode_tile	(	G2MContext *	c,
		int	tile_x,
		int	tile_y,
		const uint8_t *	src,
		size_t	src_size,
		AVCodecContext *	avctx
	)

static

Definition at line 862 of file g2meet.c.

Referenced by g2m_decode_frame().

◆ kempf_restore_buf()

static int kempf_restore_buf	(	const uint8_t *	src,
		int	len,
		uint8_t *	dst,
		int	stride,
		const uint8_t *	jpeg_tile,
		int	tile_stride,
		int	width,
		int	height,
		const uint8_t *	pal,
		int	npal,
		int	tidx
	)

static

Definition at line 1013 of file g2meet.c.

Referenced by kempf_decode_tile().

◆ kempf_decode_tile()

static int kempf_decode_tile	(	G2MContext *	c,
		int	tile_x,
		int	tile_y,
		const uint8_t *	src,
		int	src_size
	)

static

Definition at line 1048 of file g2meet.c.

Referenced by g2m_decode_frame().

◆ g2m_init_buffers()

static int g2m_init_buffers ( G2MContext * c )

static

Definition at line 1159 of file g2meet.c.

Referenced by g2m_decode_frame().

◆ g2m_load_cursor()

static int g2m_load_cursor	(	AVCodecContext *	avctx,
		G2MContext *	c,
		GetByteContext *	gb
	)

static

Definition at line 1203 of file g2meet.c.

Referenced by g2m_decode_frame().

◆ g2m_paint_cursor()

static void g2m_paint_cursor	(	G2MContext *	c,
		uint8_t *	dst,
		int	stride
	)

static

Definition at line 1325 of file g2meet.c.

Referenced by g2m_decode_frame().

◆ g2m_decode_frame()

static int g2m_decode_frame	(	AVCodecContext *	avctx,
		void *	data,
		int *	got_picture_ptr,
		AVPacket *	avpkt
	)

static

Definition at line 1374 of file g2meet.c.

◆ g2m_decode_init()

static av_cold int g2m_decode_init ( AVCodecContext * avctx )

static

Definition at line 1588 of file g2meet.c.

◆ g2m_decode_end()

static av_cold int g2m_decode_end ( AVCodecContext * avctx )

static

Definition at line 1608 of file g2meet.c.

Variable Documentation

◆ luma_quant

const uint8_t luma_quant[64]

static

Initial value:

= {
     8,  6,  5,  8, 12, 20, 26, 31,
     6,  6,  7, 10, 13, 29, 30, 28,
     7,  7,  8, 12, 20, 29, 35, 28,
     7,  9, 11, 15, 26, 44, 40, 31,
     9, 11, 19, 28, 34, 55, 52, 39,
    12, 18, 28, 32, 41, 52, 57, 46,
    25, 32, 39, 44, 52, 61, 60, 51,
    36, 46, 48, 49, 56, 50, 52, 50
}

Definition at line 63 of file g2meet.c.

Referenced by jpg_decode_block().

◆ chroma_quant

const uint8_t chroma_quant[64]

static

Initial value:

= {
     9,  9, 12, 24, 50, 50, 50, 50,
     9, 11, 13, 33, 50, 50, 50, 50,
    12, 13, 28, 50, 50, 50, 50, 50,
    24, 33, 50, 50, 50, 50, 50, 50,
    50, 50, 50, 50, 50, 50, 50, 50,
    50, 50, 50, 50, 50, 50, 50, 50,
    50, 50, 50, 50, 50, 50, 50, 50,
    50, 50, 50, 50, 50, 50, 50, 50,
}

Definition at line 74 of file g2meet.c.

Referenced by jpg_decode_block().

◆ ff_g2m_decoder

const AVCodec ff_g2m_decoder

Initial value:

= {
    .name           = "g2m",
    .long_name      = NULL_IF_CONFIG_SMALL("Go2Meeting"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_G2M,
    .priv_data_size = sizeof(G2MContext),
    .init           = g2m_decode_init,
    .close          = g2m_decode_end,
    .decode         = g2m_decode_frame,
    .capabilities   = AV_CODEC_CAP_DR1,
    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
}

Definition at line 1626 of file g2meet.c.

Data Structures

Macros

Enumerations

Functions

Variables

Detailed Description

Macro Definition Documentation

◆ EPIC_PIX_STACK_SIZE

◆ EPIC_PIX_STACK_MAX

◆ EPIC_HASH_SIZE

◆ LOAD_NEIGHBOURS

◆ UPDATE_NEIGHBOURS

◆ R_shift

◆ G_shift

◆ B_shift

◆ TOSIGNED

◆ APPLY_ALPHA

Enumeration Type Documentation

◆ ChunkType

◆ Compression

Function Documentation

◆ jpg_init()

◆ jpg_free_context()

◆ jpg_unescape()

◆ jpg_decode_block()

◆ yuv2rgb()

◆ jpg_decode_data()

◆ djb2_hash()

◆ epic_hash_init()

◆ epic_hash_find()

◆ epic_hash_add()

◆ epic_add_pixel_to_cache()

◆ epic_cache_entries_for_pixel()

◆ epic_free_pixel_cache()

◆ is_pixel_on_stack()

◆ epic_decode_component_pred()

◆ epic_decode_pixel_pred()

◆ epic_predict_pixel()

◆ epic_handle_edges()

◆ epic_decode_run_length()

◆ epic_predict_pixel2()

◆ epic_predict_from_NW_NE()

◆ epic_decode_from_cache()

◆ epic_decode_tile()

◆ epic_jb_decode_tile()

◆ kempf_restore_buf()

◆ kempf_decode_tile()

◆ g2m_init_buffers()

◆ g2m_load_cursor()

◆ g2m_paint_cursor()

◆ g2m_decode_frame()

◆ g2m_decode_init()

◆ g2m_decode_end()

Variable Documentation

◆ luma_quant

◆ chroma_quant

◆ ff_g2m_decoder