tscc2.c File Reference

TechSmith Screen Codec 2 decoder. More...

#include <inttypes.h>
#include "libavutil/mem.h"
#include "libavutil/thread.h"
#include "avcodec.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "decode.h"
#include "get_bits.h"
#include "mathops.h"
#include "tscc2data.h"

Go to the source code of this file.

Data Structures
struct	TSCC2Context

Macros
#define	BITSTREAM_READER_LE
#define	TSCC2_VLC_BITS   9
#define	DEQUANT(val, q)
#define	DCT1D(d0, d1, d2, d3, s0, s1, s2, s3, OP)
#define	COL_OP(a, b)
#define	ROW_OP(a, b)

Functions
static av_cold void	tscc2_init_vlc (VLC *vlc, int *offset, int nb_codes, const uint8_t *lens, const void *syms, int sym_length)
static av_cold void	tscc2_init_vlcs (void)
static void	tscc2_idct4_put (int *in, int q[3], uint8_t *dst, int stride)
static int	tscc2_decode_mb (TSCC2Context *c, int *q, int vlc_set, uint8_t *dst, int stride, int plane)
static int	tscc2_decode_slice (TSCC2Context *c, int mb_y, const uint8_t *buf, int buf_size)
static int	tscc2_decode_frame (AVCodecContext *avctx, AVFrame *rframe, int *got_frame, AVPacket *avpkt)
static av_cold int	tscc2_decode_end (AVCodecContext *avctx)
static av_cold int	tscc2_decode_init (AVCodecContext *avctx)

Variables
static VLC	dc_vlc
static VLC	nc_vlc [NUM_VLC_SETS]
static VLC	ac_vlc [NUM_VLC_SETS]
const FFCodec	ff_tscc2_decoder

Detailed Description

TechSmith Screen Codec 2 decoder.

Definition in file tscc2.c.

Macro Definition Documentation

BITSTREAM_READER_LE

#define BITSTREAM_READER_LE

Definition at line 32 of file tscc2.c.

TSCC2_VLC_BITS

#define TSCC2_VLC_BITS   9

Definition at line 41 of file tscc2.c.

Referenced by tscc2_decode_mb(), and tscc2_init_vlc().

DEQUANT

#define DEQUANT	(		val,
			q )

Value:

(((q) * (val) + 0x80) >> 8)

Definition at line 91 of file tscc2.c.

Referenced by tscc2_idct4_put().

DCT1D

#define DCT1D	(		d0,
			d1,
			d2,
			d3,
			s0,
			s1,
			s2,
			s3,
			OP )

Value:

    OP(d0, 5 * ((s0) + (s1) + (s2)) + 2 * (s3));  \
    OP(d1, 5 * ((s0) - (s2) - (s3)) + 2 * (s1));  \
    OP(d2, 5 * ((s0) - (s2) + (s3)) - 2 * (s1));  \
    OP(d3, 5 * ((s0) - (s1) + (s2)) - 2 * (s3));  \

Definition at line 92 of file tscc2.c.

Referenced by tscc2_idct4_put().

COL_OP

#define COL_OP	(		a,
			b )

Value:

a = (b)

Definition at line 98 of file tscc2.c.

Referenced by tscc2_idct4_put().

ROW_OP

#define ROW_OP	(		a,
			b )

Value:

a = ((b) + 0x20) >> 6

Definition at line 99 of file tscc2.c.

Referenced by tscc2_idct4_put().

Function Documentation

tscc2_init_vlc()

static av_cold void tscc2_init_vlc ( VLC * vlc, int * offset, int nb_codes, const uint8_t * lens, const void * syms, int sym_length )

static

Definition at line 57 of file tscc2.c.

Referenced by tscc2_init_vlcs().

tscc2_init_vlcs()

static av_cold void tscc2_init_vlcs ( void )

static

Definition at line 71 of file tscc2.c.

Referenced by tscc2_decode_init().

tscc2_idct4_put()

static void tscc2_idct4_put ( int * in, int q[3], uint8_t * dst, int stride )

static

Definition at line 101 of file tscc2.c.

Referenced by tscc2_decode_mb().

tscc2_decode_mb()

static int tscc2_decode_mb ( TSCC2Context * c, int * q, int vlc_set, uint8_t * dst, int stride, int plane )

static

Definition at line 124 of file tscc2.c.

Referenced by tscc2_decode_slice().

tscc2_decode_slice()

static int tscc2_decode_slice ( TSCC2Context * c, int mb_y, const uint8_t * buf, int buf_size )

static

Definition at line 183 of file tscc2.c.

Referenced by tscc2_decode_frame().

tscc2_decode_frame()

static int tscc2_decode_frame ( AVCodecContext * avctx, AVFrame * rframe, int * got_frame, AVPacket * avpkt )

static

Definition at line 209 of file tscc2.c.

tscc2_decode_end()

static av_cold int tscc2_decode_end ( AVCodecContext * avctx )

static

Definition at line 324 of file tscc2.c.

tscc2_decode_init()

static av_cold int tscc2_decode_init ( AVCodecContext * avctx )

static

Definition at line 334 of file tscc2.c.

Variable Documentation

dc_vlc

VLC dc_vlc

static

Definition at line 55 of file tscc2.c.

nc_vlc

VLC nc_vlc[NUM_VLC_SETS]

static

Definition at line 55 of file tscc2.c.

Referenced by tscc2_decode_mb(), and tscc2_init_vlcs().

ac_vlc

VLC ac_vlc[NUM_VLC_SETS]

static

Definition at line 55 of file tscc2.c.

ff_tscc2_decoder

const FFCodec ff_tscc2_decoder

Initial value:

= {
    .p.name         = "tscc2",
    CODEC_LONG_NAME("TechSmith Screen Codec 2"),
    .p.type         = AVMEDIA_TYPE_VIDEO,
    .p.id           = AV_CODEC_ID_TSCC2,
    .priv_data_size = sizeof(TSCC2Context),
    .init           = tscc2_decode_init,
    .close          = tscc2_decode_end,
    FF_CODEC_DECODE_CB(tscc2_decode_frame),
    .p.capabilities = AV_CODEC_CAP_DR1,
    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
}

Definition at line 360 of file tscc2.c.