g2meet.c File Reference

Go2Webinar decoder. More...

#include <zlib.h>
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "bytestream.h"
#include "dsputil.h"
#include "get_bits.h"
#include "internal.h"
#include "mjpeg.h"

Go to the source code of this file.

Data Structures
struct	JPGContext
struct	G2MContext

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

Enumerations
enum	ChunkType {   FRAME_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	build_vlc (VLC *vlc, const uint8_t *bits_table, const uint8_t *val_table, int nb_codes, int is_ac)
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 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 void	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]
AVCodec	ff_g2m_decoder

Detailed Description

Go2Webinar decoder.

Definition in file g2meet.c.

Macro Definition Documentation

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

Definition at line 593 of file g2meet.c.

Referenced by g2m_paint_cursor().

Enumeration Type Documentation

enum ChunkType

Enumerator:

FRAME_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 37 of file g2meet.c.

enum Compression

Enumerator:

COMPR_EPIC_J_B
COMPR_KEMPF_J_B

Definition at line 46 of file g2meet.c.

Function Documentation

static av_cold int build_vlc ( VLC *  vlc, const uint8_t *  bits_table, const uint8_t *  val_table, int  nb_codes, int  is_ac  )

static

Definition at line 110 of file g2meet.c.

Referenced by jpg_init().

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

static

Definition at line 131 of file g2meet.c.

Referenced by g2m_decode_init().

static av_cold void jpg_free_context ( JPGContext *  ctx )

static

Definition at line 159 of file g2meet.c.

Referenced by g2m_decode_end(), and g2m_decode_init().

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

static

Definition at line 171 of file g2meet.c.

Referenced by jpg_decode_data().

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

static

Definition at line 188 of file g2meet.c.

Referenced by jpg_decode_data().

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

inlinestatic

Definition at line 225 of file g2meet.c.

Referenced by 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 232 of file g2meet.c.

Referenced by kempf_decode_tile().

static void 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 308 of file g2meet.c.

Referenced by 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 337 of file g2meet.c.

Referenced by g2m_decode_frame().

static int g2m_init_buffers ( G2MContext *  c )

static

Definition at line 443 of file g2meet.c.

Referenced by g2m_decode_frame().

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

static

Definition at line 477 of file g2meet.c.

Referenced by g2m_decode_frame().

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

static

Definition at line 596 of file g2meet.c.

Referenced by g2m_decode_frame().

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

static

Definition at line 643 of file g2meet.c.

static av_cold int g2m_decode_init ( AVCodecContext *  avctx )

static

Definition at line 829 of file g2meet.c.

static av_cold int g2m_decode_end ( AVCodecContext *  avctx )

static

Definition at line 845 of file g2meet.c.

Variable Documentation

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 51 of file g2meet.c.

Referenced by jpg_decode_block().

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 62 of file g2meet.c.

Referenced by jpg_decode_block().

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   = CODEC_CAP_DR1,
}

Definition at line 861 of file g2meet.c.