FFmpeg
Data Structures | Macros | Functions | Variables
tscc2.c File Reference
#include <inttypes.h>
#include "libavutil/thread.h"
#include "avcodec.h"
#include "bytestream.h"
#include "get_bits.h"
#include "internal.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)   (((q) * (val) + 0x80) >> 8)
 
#define DCT1D(d0, d1, d2, d3, s0, s1, s2, s3, OP)
 
#define COL_OP(a, b)   a = (b)
 
#define ROW_OP(a, b)   a = ((b) + 0x20) >> 6
 

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, void *data, 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 AVCodec 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 31 of file tscc2.c.

◆ TSCC2_VLC_BITS

#define TSCC2_VLC_BITS   9

Definition at line 39 of file tscc2.c.

◆ DEQUANT

#define DEQUANT (   val,
 
)    (((q) * (val) + 0x80) >> 8)

Definition at line 89 of file tscc2.c.

◆ 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 90 of file tscc2.c.

◆ COL_OP

#define COL_OP (   a,
  b 
)    a = (b)

Definition at line 96 of file tscc2.c.

◆ ROW_OP

#define ROW_OP (   a,
  b 
)    a = ((b) + 0x20) >> 6

Definition at line 97 of file tscc2.c.

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 55 of file tscc2.c.

Referenced by tscc2_init_vlcs().

◆ tscc2_init_vlcs()

static av_cold void tscc2_init_vlcs ( void  )
static

Definition at line 69 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 99 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 122 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 181 of file tscc2.c.

Referenced by tscc2_decode_frame().

◆ tscc2_decode_frame()

static int tscc2_decode_frame ( AVCodecContext avctx,
void *  data,
int got_frame,
AVPacket avpkt 
)
static

Definition at line 207 of file tscc2.c.

◆ tscc2_decode_end()

static av_cold int tscc2_decode_end ( AVCodecContext avctx)
static

Definition at line 322 of file tscc2.c.

◆ tscc2_decode_init()

static av_cold int tscc2_decode_init ( AVCodecContext avctx)
static

Definition at line 332 of file tscc2.c.

Variable Documentation

◆ dc_vlc

VLC dc_vlc
static

Definition at line 53 of file tscc2.c.

Referenced by tscc2_decode_mb(), and tscc2_init_vlcs().

◆ nc_vlc

VLC nc_vlc[NUM_VLC_SETS]
static

Definition at line 53 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 53 of file tscc2.c.

Referenced by tscc2_decode_mb(), and tscc2_init_vlcs().

◆ ff_tscc2_decoder

const AVCodec ff_tscc2_decoder
Initial value:
= {
.name = "tscc2",
.long_name = NULL_IF_CONFIG_SMALL("TechSmith Screen Codec 2"),
.priv_data_size = sizeof(TSCC2Context),
.close = tscc2_decode_end,
.capabilities = AV_CODEC_CAP_DR1,
}

Definition at line 358 of file tscc2.c.

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: internal.h:41
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
tscc2_decode_init
static av_cold int tscc2_decode_init(AVCodecContext *avctx)
Definition: tscc2.c:332
s3
#define s3
Definition: regdef.h:40
OP
#define OP(LOAD, STORE)
Definition: hpeldsp_alpha.c:55
decode
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
s1
#define s1
Definition: regdef.h:38
TSCC2Context
Definition: tscc2.c:41
s2
#define s2
Definition: regdef.h:39
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_CODEC_ID_TSCC2
@ AV_CODEC_ID_TSCC2
Definition: codec_id.h:213
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: internal.h:49
tscc2_decode_frame
static int tscc2_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: tscc2.c:207
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
s0
#define s0
Definition: regdef.h:37
tscc2_decode_end
static av_cold int tscc2_decode_end(AVCodecContext *avctx)
Definition: tscc2.c:322