indeo4.c File Reference

Indeo Video Interactive version 4 decoder. More...

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

Go to the source code of this file.

Macros
#define	BITSTREAM_READER_LE
#define	IVI4_PIC_SIZE_ESC   7

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.

Macro Definition Documentation

#define BITSTREAM_READER_LE

Definition at line 30 of file indeo4.c.

#define IVI4_PIC_SIZE_ESC   7

Definition at line 37 of file indeo4.c.

Referenced by decode_pic_hdr().

Function Documentation

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 75 of file indeo4.c.

Referenced by decode_pic_hdr().

static int scale_tile_size ( int  def_size, int  size_factor  )

inlinestatic

Definition at line 92 of file indeo4.c.

Referenced by decode_pic_hdr().

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 104 of file indeo4.c.

Referenced by decode_init().

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 269 of file indeo4.c.

Referenced by decode_init().

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 466 of file indeo4.c.

Referenced by decode_init().

static void switch_buffers ( IVI45DecContext *  ctx )

static

Rearrange decoding and reference buffers.

Parameters

[in,out]

ctx

pointer to the decoder context

Definition at line 627 of file indeo4.c.

Referenced by decode_init().

static int is_nonnull_frame ( IVI45DecContext *  ctx )

static

Definition at line 656 of file indeo4.c.

Referenced by decode_init().

static av_cold int decode_init ( AVCodecContext *  avctx )

static

Definition at line 662 of file indeo4.c.

Variable Documentation

InvTransformPtr* inv_trans

Definition at line 41 of file indeo4.c.

Referenced by decode_band_hdr().

DCTransformPtr* dc_trans

Definition at line 42 of file indeo4.c.

int is_2d_trans

Definition at line 43 of file indeo4.c.

struct { ... } transforms[18]

Initial value:

= {
    { ff_ivi_inverse_haar_8x8,  ff_ivi_dc_haar_2d,       1 },
    { ff_ivi_row_haar8,         ff_ivi_dc_haar_2d,       0 },
    { ff_ivi_col_haar8,         ff_ivi_dc_haar_2d,       0 },
    { ff_ivi_put_pixels_8x8,    ff_ivi_put_dc_pixel_8x8, 1 },
    { ff_ivi_inverse_slant_8x8, ff_ivi_dc_slant_2d,      1 },
    { ff_ivi_row_slant8,        ff_ivi_dc_row_slant,     1 },
    { ff_ivi_col_slant8,        ff_ivi_dc_col_slant,     1 },
    { NULL, NULL, 0 }, 
    { NULL, NULL, 0 }, 
    { NULL, NULL, 0 }, 
    { ff_ivi_inverse_haar_4x4,  ff_ivi_dc_haar_2d,       1 },
    { ff_ivi_inverse_slant_4x4, ff_ivi_dc_slant_2d,      1 },
    { NULL, NULL, 0 }, 
    { ff_ivi_row_haar4,         ff_ivi_dc_haar_2d,       0 },
    { ff_ivi_col_haar4,         ff_ivi_dc_haar_2d,       0 },
    { ff_ivi_row_slant4,        ff_ivi_dc_row_slant,     0 },
    { ff_ivi_col_slant4,        ff_ivi_dc_col_slant,     0 },
    { NULL, NULL, 0 }, 
}

Referenced by decode_band_hdr().

AVCodec ff_indeo4_decoder

Initial value:

= {
    .name           = "indeo4",
    .long_name      = NULL_IF_CONFIG_SMALL("Intel Indeo Video Interactive 4"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_INDEO4,
    .priv_data_size = sizeof(IVI45DecContext),
    .init           = decode_init,
    .close          = ff_ivi_decode_close,
    .decode         = ff_ivi_decode_frame,
    .capabilities   = CODEC_CAP_DR1,
}

Definition at line 697 of file indeo4.c.