smacker.c File Reference

#include <stddef.h>
#include "libavutil/channel_layout.h"
#include "libavutil/mem.h"
#include "avcodec.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "decode.h"
#include "get_bits.h"

Go to the source code of this file.

Data Structures
struct	SmackVContext
struct	HuffEntry
struct	HuffContext
	Context used for code reconstructing. More...
struct	DBCtx

Macros
#define	SMKTREE_BITS   9
#define	SMK_NODE   0x80000000
#define	SMKTREE_DECODE_MAX_RECURSION   FFMIN(32, 3 * SMKTREE_BITS)
#define	SMKTREE_DECODE_BIG_MAX_RECURSION   500
#define	UNCHECKED_BITSTREAM_READER   1
#define	BITSTREAM_READER_LE

Enumerations
enum	SmkBlockTypes { SMK_BLK_MONO = 0, SMK_BLK_FULL = 1, SMK_BLK_SKIP = 2, SMK_BLK_FILL = 3 }

Functions
static int	smacker_decode_tree (AVCodecContext *avctx, GetBitContext *gb, HuffContext *hc, int length)
	Decode local frame tree. More...
static int	smacker_decode_bigtree (AVCodecContext *avctx, GetBitContext *gb, DBCtx *ctx, int length)
	Decode header tree. More...
static int	smacker_decode_header_tree (SmackVContext *smk, GetBitContext *gb, int **recodes, int *last, int size)
	Store large tree as FFmpeg's vlc codes. More...
static int	decode_header_trees (SmackVContext *smk)
static av_always_inline void	last_reset (int *recode, int *last)
static av_always_inline int	smk_get_code (GetBitContext *gb, int *recode, int *last)
static int	decode_frame (AVCodecContext *avctx, AVFrame *rframe, int *got_frame, AVPacket *avpkt)
static av_cold int	decode_end (AVCodecContext *avctx)
static av_cold int	decode_init (AVCodecContext *avctx)
static av_cold int	smka_decode_init (AVCodecContext *avctx)
static int	smka_decode_frame (AVCodecContext *avctx, AVFrame *frame, int *got_frame_ptr, AVPacket *avpkt)
	Decode Smacker audio data. More...

Variables
static const int	block_runs [64]
const FFCodec	ff_smacker_decoder
const FFCodec	ff_smackaud_decoder

Detailed Description

Smacker decoder

Definition in file smacker.c.

Macro Definition Documentation

SMKTREE_BITS

#define SMKTREE_BITS   9

Definition at line 38 of file smacker.c.

SMK_NODE

#define SMK_NODE   0x80000000

Definition at line 39 of file smacker.c.

SMKTREE_DECODE_MAX_RECURSION

#define SMKTREE_DECODE_MAX_RECURSION   FFMIN(32, 3 * SMKTREE_BITS)

Definition at line 41 of file smacker.c.

SMKTREE_DECODE_BIG_MAX_RECURSION

#define SMKTREE_DECODE_BIG_MAX_RECURSION   500

Definition at line 42 of file smacker.c.

UNCHECKED_BITSTREAM_READER

#define UNCHECKED_BITSTREAM_READER   1

Definition at line 49 of file smacker.c.

BITSTREAM_READER_LE

#define BITSTREAM_READER_LE

Definition at line 51 of file smacker.c.

Enumeration Type Documentation

SmkBlockTypes

enum SmkBlockTypes

Enumerator
SMK_BLK_MONO
SMK_BLK_FULL
SMK_BLK_SKIP
SMK_BLK_FILL

Definition at line 99 of file smacker.c.

Function Documentation

smacker_decode_tree()

static int smacker_decode_tree ( AVCodecContext *  avctx, GetBitContext *  gb, HuffContext *  hc, int  length  )

static

Decode local frame tree.

Can read SMKTREE_DECODE_MAX_RECURSION before the first check; does not overread gb on success.

Definition at line 111 of file smacker.c.

Referenced by smacker_decode_header_tree(), and smka_decode_frame().

smacker_decode_bigtree()

static int smacker_decode_bigtree ( AVCodecContext *  avctx, GetBitContext *  gb, DBCtx *  ctx, int  length  )

static

Decode header tree.

Checks before the first read, can overread by 6 * SMKTREE_BITS on success.

Definition at line 142 of file smacker.c.

Referenced by smacker_decode_header_tree().

smacker_decode_header_tree()

static int smacker_decode_header_tree ( SmackVContext *  smk, GetBitContext *  gb, int **  recodes, int *  last, int  size  )

static

Store large tree as FFmpeg's vlc codes.

Can read FFMAX(1 + SMKTREE_DECODE_MAX_RECURSION, 2 + 3 * 16) bits before the first check; can overread by 6 * SMKTREE_BITS + 1 on success.

Definition at line 198 of file smacker.c.

Referenced by decode_header_trees().

decode_header_trees()

static int decode_header_trees ( SmackVContext *  smk )

static

Definition at line 274 of file smacker.c.

Referenced by decode_init().

last_reset()

static av_always_inline void last_reset ( int *  recode, int *  last  )

static

Definition at line 346 of file smacker.c.

Referenced by decode_frame().

smk_get_code()

static av_always_inline int smk_get_code ( GetBitContext *  gb, int *  recode, int *  last  )

static

Definition at line 352 of file smacker.c.

Referenced by decode_frame().

decode_frame()

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

static

Definition at line 373 of file smacker.c.

decode_end()

static av_cold int decode_end ( AVCodecContext *  avctx )

static

Definition at line 536 of file smacker.c.

decode_init()

static av_cold int decode_init ( AVCodecContext *  avctx )

static

Definition at line 551 of file smacker.c.

smka_decode_init()

static av_cold int smka_decode_init ( AVCodecContext *  avctx )

static

Definition at line 579 of file smacker.c.

smka_decode_frame()

static int smka_decode_frame ( AVCodecContext *  avctx, AVFrame *  frame, int *  got_frame_ptr, AVPacket *  avpkt  )

static

Decode Smacker audio data.

Definition at line 596 of file smacker.c.

Variable Documentation

block_runs

const int block_runs[64]

static

Initial value:

= {
      1,    2,    3,    4,    5,    6,    7,    8,
      9,   10,   11,   12,   13,   14,   15,   16,
     17,   18,   19,   20,   21,   22,   23,   24,
     25,   26,   27,   28,   29,   30,   31,   32,
     33,   34,   35,   36,   37,   38,   39,   40,
     41,   42,   43,   44,   45,   46,   47,   48,
     49,   50,   51,   52,   53,   54,   55,   56,
     57,   58,   59,  128,  256,  512, 1024, 2048 }

Definition at line 89 of file smacker.c.

Referenced by decode_frame().

ff_smacker_decoder

const FFCodec ff_smacker_decoder

Initial value:

= {
    .p.name         = "smackvid",
    CODEC_LONG_NAME("Smacker video"),
    .p.type         = AVMEDIA_TYPE_VIDEO,
    .p.id           = AV_CODEC_ID_SMACKVIDEO,
    .priv_data_size = sizeof(SmackVContext),
    .init           = decode_init,
    .close          = decode_end,
    FF_CODEC_DECODE_CB(decode_frame),
    .p.capabilities = AV_CODEC_CAP_DR1,
    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
}

Definition at line 750 of file smacker.c.

ff_smackaud_decoder

const FFCodec ff_smackaud_decoder

Initial value:

= {
    .p.name         = "smackaud",
    CODEC_LONG_NAME("Smacker audio"),
    .p.type         = AVMEDIA_TYPE_AUDIO,
    .p.id           = AV_CODEC_ID_SMACKAUDIO,
    .init           = smka_decode_init,
    FF_CODEC_DECODE_CB(smka_decode_frame),
    .p.capabilities = AV_CODEC_CAP_DR1,
}

Definition at line 763 of file smacker.c.