VC9 Bitplane decoding

Defines
#define	IMODE_RAW   0
#define	IMODE_NORM2   1
#define	IMODE_DIFF2   2
#define	IMODE_NORM6   3
#define	IMODE_DIFF6   4
#define	IMODE_ROWSKIP   5
#define	IMODE_COLSKIP   6
Functions
int	alloc_bitplane (BitPlane *bp, int width, int height)
void	free_bitplane (BitPlane *bp)
static void	decode_rowskip (uint8_t *plane, int width, int height, int stride, GetBitContext *gb)
static void	decode_colskip (uint8_t *plane, int width, int height, int stride, GetBitContext *gb)
static int	bitplane_decoding (BitPlane *bp, VC9Context *v)

---

Detailed Description

See also:

8.7, p56

Imode types

---

Define Documentation

#define IMODE_COLSKIP   6

Definition at line 921 of file vc9.c.

Referenced by bitplane_decoding().

#define IMODE_DIFF2   2

Definition at line 917 of file vc9.c.

Referenced by bitplane_decoding().

#define IMODE_DIFF6   4

Definition at line 919 of file vc9.c.

Referenced by bitplane_decoding().

#define IMODE_NORM2   1

Definition at line 916 of file vc9.c.

Referenced by bitplane_decoding().

#define IMODE_NORM6   3

Definition at line 918 of file vc9.c.

Referenced by bitplane_decoding().

#define IMODE_RAW   0

Definition at line 915 of file vc9.c.

Referenced by bitplane_decoding().

#define IMODE_ROWSKIP   5

Definition at line 920 of file vc9.c.

Referenced by bitplane_decoding().

---

Function Documentation

int alloc_bitplane	(	BitPlane *	bp,
		int	width,
		int	height
	)

Allocate the buffer from a bitplane, given its dimensions

Parameters:

	bp	Bitplane which buffer is to allocate
[in]	width	Width of the buffer
[in]	height	Height of the buffer

Returns:

Status

Todo:

TODO: Take into account stride

Todo:

TODO: Allow use of external buffers ?

Definition at line 932 of file vc9.c.

References av_malloc(), BitPlane::data, BitPlane::height, BitPlane::stride, and BitPlane::width.

Referenced by vc9_decode_init().

Here is the call graph for this function:

static int bitplane_decoding	(	BitPlane *	bp,
		VC9Context *	v
	)			[static]

Decode a bitplane's bits

Parameters:

	bp	Bitplane where to store the decode bits
	v	VC9 context for bit reading and logging

Returns:

Status FIXME: Optimize

Todo:

TODO: Decide if a struct is needed

Definition at line 998 of file vc9.c.

References av_log(), AV_LOG_DEBUG, MpegEncContext::avctx, BitPlane::data, decode_colskip(), decode_rowskip(), MpegEncContext::gb, get_bits(), get_vlc2(), height, BitPlane::height, IMODE_COLSKIP, IMODE_DIFF2, IMODE_DIFF6, IMODE_NORM2, IMODE_NORM6, IMODE_RAW, IMODE_ROWSKIP, BitPlane::is_raw, offset, VC9Context::s, BitPlane::stride, VLC::table, VC9_IMODE_VLC_BITS, VC9_NORM2_VLC_BITS, VC9_NORM6_VLC_BITS, width, and BitPlane::width.

Referenced by decode_b_picture_secondary_header(), decode_i_picture_secondary_header(), and decode_p_picture_secondary_header().

Here is the call graph for this function:

static void decode_colskip	(	uint8_t *	plane,
		int	width,
		int	height,
		int	stride,
		GetBitContext *	gb
	)			[static]

Decode columns by checking if they are skipped

Parameters:

	plane	Buffer to store decoded bits
[in]	width	Width of this buffer
[in]	height	Height of this buffer
[in]	stride	of this buffer FIXME: Optimize

Definition at line 977 of file vc9.c.

References get_bits().

Referenced by bitplane_decoding().

Here is the call graph for this function:

static void decode_rowskip	(	uint8_t *	plane,
		int	width,
		int	height,
		int	stride,
		GetBitContext *	gb
	)			[static]

Decode rows by checking if they are skipped

Parameters:

	plane	Buffer to store decoded bits
[in]	width	Width of this buffer
[in]	height	Height of this buffer
[in]	stride	of this buffer

Definition at line 957 of file vc9.c.

References get_bits().

Referenced by bitplane_decoding().

Here is the call graph for this function:

void free_bitplane

(

BitPlane *

bp

)

Free the bitplane's buffer

Parameters:

bp

Bitplane which buffer is to free

Definition at line 945 of file vc9.c.

References av_freep(), BitPlane::data, BitPlane::height, BitPlane::stride, and BitPlane::width.

Referenced by vc9_decode_end().

Here is the call graph for this function: