libavcodec/indeo4.c File Reference

Indeo Video Interactive version 4 decoder. More...

#include "avcodec.h"
#include "get_bits.h"
#include "dsputil.h"
#include "ivi_dsp.h"
#include "ivi_common.h"
#include "indeo4data.h"

Go to the source code of this file.

Defines
#define	BITSTREAM_READER_LE
#define	IVI4_PIC_SIZE_ESC   7
Enumerations
enum	{   FRAMETYPE_INTRA = 0, FRAMETYPE_BIDIR1 = 1, FRAMETYPE_INTER = 2, FRAMETYPE_BIDIR = 3,   FRAMETYPE_INTER_NOREF = 4, FRAMETYPE_NULL_FIRST = 5, FRAMETYPE_NULL_LAST = 6 }
	Indeo 4 frame types. More...
Functions
static int	decode_plane_subdivision (GetBitContext *gb)
	Decode subdivision of a plane.
static int	scale_tile_size (int def_size, int size_factor)
static int	decode_pic_hdr (IVI45DecContext *ctx, AVCodecContext *avctx)
	Decode Indeo 4 picture header.
static int	decode_band_hdr (IVI45DecContext *ctx, IVIBandDesc *band, AVCodecContext *avctx)
	Decode Indeo 4 band header.
static int	decode_mb_info (IVI45DecContext *ctx, IVIBandDesc *band, IVITile *tile, AVCodecContext *avctx)
	Decode information (block type, cbp, quant delta, motion vector) for all macroblocks in the current tile.
static void	switch_buffers (IVI45DecContext *ctx)
	Rearrange decoding and reference buffers.
static int	is_nonnull_frame (IVI45DecContext *ctx)
static av_cold int	decode_init (AVCodecContext *avctx)
Variables
struct {
InvTransformPtr *   inv_trans
DCTransformPtr *   dc_trans
int   is_2d_trans
}	transforms [18]
AVCodec	ff_indeo4_decoder

---

Detailed Description

Indeo Video Interactive version 4 decoder.

Indeo 4 data is usually transported within .avi or .mov files. Known FOURCCs: 'IV41'

Definition in file indeo4.c.

---

Define Documentation

#define BITSTREAM_READER_LE

Definition at line 30 of file indeo4.c.

#define IVI4_PIC_SIZE_ESC   7

Definition at line 51 of file indeo4.c.

Referenced by decode_pic_hdr().

---

Enumeration Type Documentation

anonymous enum

Indeo 4 frame types.

Enumerator:

FRAMETYPE_INTRA
FRAMETYPE_BIDIR1	bidirectional frame
FRAMETYPE_INTER	non-droppable P-frame
FRAMETYPE_BIDIR	bidirectional frame
FRAMETYPE_INTER_NOREF	droppable P-frame
FRAMETYPE_NULL_FIRST	empty frame with no data
FRAMETYPE_NULL_LAST	empty frame with no data

Definition at line 41 of file indeo4.c.

---

Function Documentation

static int decode_band_hdr	(	IVI45DecContext *	ctx,
		IVIBandDesc *	band,
		AVCodecContext *	avctx
	)			[static]

Decode Indeo 4 band header.

Parameters:

[in,out]	ctx	pointer to the decoder context
[in,out]	band	pointer to the band descriptor
[in]	avctx	pointer to the AVCodecContext

Returns:

result code: 0 = OK, negative number = error

Definition at line 282 of file indeo4.c.

Referenced by decode_init().

static av_cold int decode_init

(

AVCodecContext *

avctx

)

[static]

Definition at line 578 of file indeo4.c.

static int decode_mb_info	(	IVI45DecContext *	ctx,
		IVIBandDesc *	band,
		IVITile *	tile,
		AVCodecContext *	avctx
	)			[static]

Decode information (block type, cbp, quant delta, motion vector) for all macroblocks in the current tile.

Parameters:

[in,out]	ctx	pointer to the decoder context
[in,out]	band	pointer to the band descriptor
[in,out]	tile	pointer to the tile descriptor
[in]	avctx	pointer to the AVCodecContext

Returns:

result code: 0 = OK, negative number = error

Definition at line 418 of file indeo4.c.

Referenced by decode_init().

static int decode_pic_hdr	(	IVI45DecContext *	ctx,
		AVCodecContext *	avctx
	)			[static]

Decode Indeo 4 picture header.

Parameters:

[in,out]	ctx	pointer to the decoder context
[in]	avctx	pointer to the AVCodecContext

Returns:

result code: 0 = OK, negative number = error

Definition at line 118 of file indeo4.c.

Referenced by decode_init().

static int decode_plane_subdivision

(

GetBitContext *

gb

)

[static]

Decode subdivision of a plane.

This is a simplified version that checks for two supported subdivisions:

• 1 wavelet band per plane, size factor 1:1, code pattern: 3
• 4 wavelet bands per plane, size factor 1:4, code pattern: 2,3,3,3,3 Anything else is either unsupported or corrupt.

Parameters:

[in,out]

gb

the GetBit context

Returns:

number of wavelet bands or 0 on error

Definition at line 89 of file indeo4.c.

Referenced by decode_pic_hdr().

static int is_nonnull_frame

(

IVI45DecContext *

ctx

)

[static]

Definition at line 572 of file indeo4.c.

Referenced by decode_init().

static int scale_tile_size	(	int	def_size,
		int	size_factor
	)			[inline, static]

Definition at line 106 of file indeo4.c.

Referenced by decode_pic_hdr().

static void switch_buffers

(

IVI45DecContext *

ctx

)

[static]

Rearrange decoding and reference buffers.

Parameters:

[in,out]

ctx

pointer to the decoder context

Definition at line 543 of file indeo4.c.

Referenced by decode_init().

---

Variable Documentation

DCTransformPtr* dc_trans

Definition at line 56 of file indeo4.c.

AVCodec ff_indeo4_decoder

Initial value:

 {
    .name           = "indeo4",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = CODEC_ID_INDEO4,
    .priv_data_size = sizeof(IVI45DecContext),
    .init           = decode_init,
    .close          = ff_ivi_decode_close,
    .decode         = ff_ivi_decode_frame,
    .long_name      = NULL_IF_CONFIG_SMALL("Intel Indeo Video Interactive 4"),
}

Definition at line 604 of file indeo4.c.

InvTransformPtr* inv_trans

Definition at line 55 of file indeo4.c.

Referenced by decode_band_hdr().

int is_2d_trans

Definition at line 57 of file indeo4.c.

struct { ... } transforms[18] [static]

Referenced by decode_band_hdr().