ivi.c File Reference

This file contains functions and data shared by both Indeo4 and Indeo5 decoders. More...

#include <inttypes.h>
#include "libavutil/attributes.h"
#include "libavutil/imgutils.h"
#include "libavutil/timer.h"
#include "avcodec.h"
#include "get_bits.h"
#include "internal.h"
#include "mathops.h"
#include "ivi.h"
#include "ivi_dsp.h"

Typedefs
typedef void(*	ivi_mc_func) (int16_t *buf, const int16_t *ref_buf, ptrdiff_t pitch, int mc_type)
typedef void(*	ivi_mc_avg_func) (int16_t *buf, const int16_t *ref_buf1, const int16_t *ref_buf2, ptrdiff_t pitch, int mc_type, int mc_type2)

Functions
av_cold void	ff_ivi_init_static_vlc (void)
	Initialize static codes used for macroblock and block decoding.
int	ff_ivi_dec_huff_desc (GetBitContext *gb, int desc_coded, int which_tab, IVIHuffTab *huff_tab, AVCodecContext *avctx)
	Decode a huffman codebook descriptor from the bitstream and select specified huffman table. More...
av_cold int	ff_ivi_init_planes (AVCodecContext *avctx, IVIPlaneDesc *planes, const IVIPicConfig *cfg, int is_indeo4)
	Initialize planes (prepares descriptors, allocates buffers etc). More...
av_cold int	ff_ivi_init_tiles (IVIPlaneDesc *planes, int tile_width, int tile_height)
	Initialize tile and macroblock descriptors. More...
int	ff_ivi_decode_frame (AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
av_cold int	ff_ivi_decode_close (AVCodecContext *avctx)
	Close Indeo5 decoder and clean up its context.

Variables
const uint8_t	ff_ivi_vertical_scan_8x8 [64]
	Scan patterns shared between indeo4 and indeo5. More...
const uint8_t	ff_ivi_horizontal_scan_8x8 [64]
const uint8_t	ff_ivi_direct_scan_4x4 [16]
const RVMapDesc	ff_ivi_rvmap_tabs [9]
	Run-value (RLE) tables.

Detailed Description

This file contains functions and data shared by both Indeo4 and Indeo5 decoders.

Function Documentation

ff_ivi_dec_huff_desc()

int ff_ivi_dec_huff_desc	(	GetBitContext *	gb,
		int	desc_coded,
		int	which_tab,
		IVIHuffTab *	huff_tab,
		AVCodecContext *	avctx
	)

Decode a huffman codebook descriptor from the bitstream and select specified huffman table.

Parameters

[in,out]	gb	the GetBit context
[in]	desc_coded	flag signalling if table descriptor was coded
[in]	which_tab	codebook purpose (IVI_MB_HUFF or IVI_BLK_HUFF)
[out]	huff_tab	pointer to the descriptor of the selected table
[in]	avctx	AVCodecContext pointer

Returns

zero on success, negative value otherwise

ff_ivi_init_planes()

av_cold int ff_ivi_init_planes	(	AVCodecContext *	avctx,
		IVIPlaneDesc *	planes,
		const IVIPicConfig *	cfg,
		int	is_indeo4
	)

Initialize planes (prepares descriptors, allocates buffers etc).

Parameters

[in,out]	planes	pointer to the array of the plane descriptors
[in]	cfg	pointer to the ivi_pic_config structure describing picture layout
[in]	is_indeo4	flag signalling if it is Indeo 4 or not

Returns

result code: 0 - OK

ff_ivi_init_tiles()

av_cold int ff_ivi_init_tiles	(	IVIPlaneDesc *	planes,
		int	tile_width,
		int	tile_height
	)

Initialize tile and macroblock descriptors.

Parameters

[in,out]	planes	pointer to the array of the plane descriptors
[in]	tile_width	tile width
[in]	tile_height	tile height

Returns

result code: 0 - OK

Variable Documentation

ff_ivi_direct_scan_4x4

const uint8_t ff_ivi_direct_scan_4x4[16]

Initial value:

= {
    0, 1, 4, 8, 5, 2, 3, 6, 9, 12, 13, 10, 7, 11, 14, 15
}

ff_ivi_horizontal_scan_8x8

const uint8_t ff_ivi_horizontal_scan_8x8[64]

Initial value:

= {
     0,  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, 60, 61, 62, 63
}

ff_ivi_vertical_scan_8x8

const uint8_t ff_ivi_vertical_scan_8x8[64]

Initial value:

= {
    0,  8, 16, 24, 32, 40, 48, 56,
    1,  9, 17, 25, 33, 41, 49, 57,
    2, 10, 18, 26, 34, 42, 50, 58,
    3, 11, 19, 27, 35, 43, 51, 59,
    4, 12, 20, 28, 36, 44, 52, 60,
    5, 13, 21, 29, 37, 45, 53, 61,
    6, 14, 22, 30, 38, 46, 54, 62,
    7, 15, 23, 31, 39, 47, 55, 63
}

Scan patterns shared between indeo4 and indeo5.

Common scan patterns (defined in ivi_common.c)