h261dec.c File Reference

---

Detailed Description

H.261 decoder.

Definition in file h261dec.c.

Go to the source code of this file.

Functions
static int	h261_decode_block (H261Context *h, DCTELEM *block, int n, int coded)
	decodes a macroblock
static void	h261_decode_init_vlc (H261Context *h)
static int	h261_decode_init (AVCodecContext *avctx)
static int	h261_decode_gob_header (H261Context *h)
	decodes the group of blocks header or slice header.
static int	ff_h261_resync (H261Context *h)
	decodes the group of blocks / video packet header.
static int	h261_decode_mb_skipped (H261Context *h, int mba1, int mba2)
	decodes skipped macroblocks
static int	decode_mv_component (GetBitContext *gb, int v)
static int	h261_decode_mb (H261Context *h)
static int	h261_decode_picture_header (H261Context *h)
	decodes the H261 picture header.
static int	h261_decode_gob (H261Context *h)
static int	get_consumed_bytes (MpegEncContext *s, int buf_size)
	returns the number of bytes consumed for building the current frame
static int	h261_decode_frame (AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
static int	h261_decode_end (AVCodecContext *avctx)
Variables
uint8_t	ff_h261_rl_table_store [2][2 *MAX_RUN+MAX_LEVEL+3]
static VLC	h261_mba_vlc
static VLC	h261_mtype_vlc
static VLC	h261_mv_vlc
static VLC	h261_cbp_vlc
AVCodec	h261_decoder

---

Function Documentation

static int h261_decode_block	(	H261Context *	h,
		DCTELEM *	block,
		int	n,
		int	coded
	)			[static]

decodes a macroblock

Returns:

<0 if an error occured

Definition at line 357 of file h261dec.c.

Referenced by h261_decode_mb().

static void h261_decode_init_vlc

(

H261Context *

h

)

[static]

Definition at line 51 of file h261dec.c.

Referenced by h261_decode_init().

static int h261_decode_init

(

AVCodecContext *

avctx

)

[static]

Definition at line 73 of file h261dec.c.

static int h261_decode_gob_header

(

H261Context *

h

)

[static]

decodes the group of blocks header or slice header.

Returns:

<0 if an error occured

Definition at line 102 of file h261dec.c.

Referenced by ff_h261_resync().

static int ff_h261_resync

(

H261Context *

h

)

[static]

decodes the group of blocks / video packet header.

Returns:

<0 if no resync found

Definition at line 152 of file h261dec.c.

Referenced by h261_decode_frame().

static int h261_decode_mb_skipped	(	H261Context *	h,
		int	mba1,
		int	mba2
	)			[static]

decodes skipped macroblocks

Returns:

0

Definition at line 193 of file h261dec.c.

Referenced by h261_decode_gob().

static int decode_mv_component	(	GetBitContext *	gb,
		int	v
	)			[static]

Definition at line 226 of file h261dec.c.

Referenced by h261_decode_mb().

static int h261_decode_mb

(

H261Context *

h

)

[static]

Definition at line 245 of file h261dec.c.

Referenced by h261_decode_gob().

static int h261_decode_picture_header

(

H261Context *

h

)

[static]

decodes the H261 picture header.

Returns:

<0 if no startcode found

Definition at line 439 of file h261dec.c.

Referenced by h261_decode_frame().

static int h261_decode_gob

(

H261Context *

h

)

[static]

Definition at line 504 of file h261dec.c.

Referenced by h261_decode_frame().

static int get_consumed_bytes	(	MpegEncContext *	s,
		int	buf_size
	)			[static]

returns the number of bytes consumed for building the current frame

Definition at line 533 of file h261dec.c.

Referenced by decode_frame(), ff_h263_decode_frame(), and h261_decode_frame().

static int h261_decode_frame	(	AVCodecContext *	avctx,
		void *	data,
		int *	data_size,
		uint8_t *	buf,
		int	buf_size
	)			[static]

Definition at line 541 of file h261dec.c.

static int h261_decode_end

(

AVCodecContext *

avctx

)

[static]

Definition at line 631 of file h261dec.c.

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Variable Documentation

uint8_t ff_h261_rl_table_store[2][2 *MAX_RUN+MAX_LEVEL+3]

Definition at line 34 of file h261.c.

VLC h261_mba_vlc [static]

Definition at line 44 of file h261dec.c.

VLC h261_mtype_vlc [static]

Definition at line 45 of file h261dec.c.

VLC h261_mv_vlc [static]

Definition at line 46 of file h261dec.c.

VLC h261_cbp_vlc [static]

Definition at line 47 of file h261dec.c.

AVCodec h261_decoder

Initial value:

 {
    "h261",
    CODEC_TYPE_VIDEO,
    CODEC_ID_H261,
    sizeof(H261Context),
    h261_decode_init,
    NULL,
    h261_decode_end,
    h261_decode_frame,
    CODEC_CAP_DR1,
}

Definition at line 640 of file h261dec.c.