[deb_ffmpeg.git] / ffmpeg / libavcodec / ivi_common.h

/*
 * common functions for Indeo Video Interactive codecs (Indeo4 and Indeo5)
 *
 * Copyright (c) 2009 Maxim Poliakovski
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * This file contains structures and macros shared by both Indeo4 and
 * Indeo5 decoders.
 */

#ifndef AVCODEC_IVI_COMMON_H
#define AVCODEC_IVI_COMMON_H

#include "avcodec.h"
#include "get_bits.h"
#include <stdint.h>

/**
 *  Indeo 4 frame types.
 */
enum {
    IVI4_FRAMETYPE_INTRA       = 0,
    IVI4_FRAMETYPE_INTRA1      = 1,  ///< intra frame with slightly different bitstream coding
    IVI4_FRAMETYPE_INTER       = 2,  ///< non-droppable P-frame
    IVI4_FRAMETYPE_BIDIR       = 3,  ///< bidirectional frame
    IVI4_FRAMETYPE_INTER_NOREF = 4,  ///< droppable P-frame
    IVI4_FRAMETYPE_NULL_FIRST  = 5,  ///< empty frame with no data
    IVI4_FRAMETYPE_NULL_LAST   = 6   ///< empty frame with no data
};

#define IVI_VLC_BITS 13 ///< max number of bits of the ivi's huffman codes
#define IVI4_STREAM_ANALYSER    0
#define IVI5_IS_PROTECTED       0x20

/**
 *  huffman codebook descriptor
 */
typedef struct IVIHuffDesc {
    int32_t     num_rows;
    uint8_t     xbits[16];
} IVIHuffDesc;

/**
 *  macroblock/block huffman table descriptor
 */
typedef struct IVIHuffTab {
    int32_t     tab_sel;    /// index of one of the predefined tables
                            /// or "7" for custom one
    VLC         *tab;       /// pointer to the table associated with tab_sel

    /// the following are used only when tab_sel == 7
    IVIHuffDesc cust_desc;  /// custom Huffman codebook descriptor
    VLC         cust_tab;   /// vlc table for custom codebook
} IVIHuffTab;

enum {
    IVI_MB_HUFF   = 0,      /// Huffman table is used for coding macroblocks
    IVI_BLK_HUFF  = 1       /// Huffman table is used for coding blocks
};


/**
 *  Common scan patterns (defined in ivi_common.c)
 */
extern const uint8_t ff_ivi_vertical_scan_8x8[64];
extern const uint8_t ff_ivi_horizontal_scan_8x8[64];
extern const uint8_t ff_ivi_direct_scan_4x4[16];


/**
 *  Declare inverse transform function types
 */
typedef void (InvTransformPtr)(const int32_t *in, int16_t *out, uint32_t pitch, const uint8_t *flags);
typedef void (DCTransformPtr) (const int32_t *in, int16_t *out, uint32_t pitch, int blk_size);


/**
 *  run-value (RLE) table descriptor
 */
typedef struct RVMapDesc {
    uint8_t     eob_sym; ///< end of block symbol
    uint8_t     esc_sym; ///< escape symbol
    uint8_t     runtab[256];
    int8_t      valtab[256];
} RVMapDesc;

extern const RVMapDesc ff_ivi_rvmap_tabs[9];


/**
 *  information for Indeo macroblock (16x16, 8x8 or 4x4)
 */
typedef struct IVIMbInfo {
    int16_t     xpos;
    int16_t     ypos;
    uint32_t    buf_offs; ///< address in the output buffer for this mb
    uint8_t     type;     ///< macroblock type: 0 - INTRA, 1 - INTER
    uint8_t     cbp;      ///< coded block pattern
    int8_t      q_delta;  ///< quant delta
    int8_t      mv_x;     ///< motion vector (x component)
    int8_t      mv_y;     ///< motion vector (y component)
    int8_t      b_mv_x;   ///< second motion vector (x component)
    int8_t      b_mv_y;   ///< second motion vector (y component)
} IVIMbInfo;


/**
 *  information for Indeo tile
 */
typedef struct IVITile {
    int         xpos;
    int         ypos;
    int         width;
    int         height;
    int         mb_size;
    int         is_empty;  ///< = 1 if this tile doesn't contain any data
    int         data_size; ///< size of the data in bytes
    int         num_MBs;   ///< number of macroblocks in this tile
    IVIMbInfo   *mbs;      ///< array of macroblock descriptors
    IVIMbInfo   *ref_mbs;  ///< ptr to the macroblock descriptors of the reference tile
} IVITile;


/**
 *  information for Indeo wavelet band
 */
typedef struct IVIBandDesc {
    int             plane;          ///< plane number this band belongs to
    int             band_num;       ///< band number
    int             width;
    int             height;
    int             aheight;        ///< aligned band height
    const uint8_t   *data_ptr;      ///< ptr to the first byte of the band data
    int             data_size;      ///< size of the band data
    int16_t         *buf;           ///< pointer to the output buffer for this band
    int16_t         *ref_buf;       ///< pointer to the reference frame buffer (for motion compensation)
    int16_t         *b_ref_buf;     ///< pointer to the second reference frame buffer (for motion compensation)
    int16_t         *bufs[4];       ///< array of pointers to the band buffers
    int             pitch;          ///< pitch associated with the buffers above
    int             is_empty;       ///< = 1 if this band doesn't contain any data
    int             mb_size;        ///< macroblock size
    int             blk_size;       ///< block size
    int             is_halfpel;     ///< precision of the motion compensation: 0 - fullpel, 1 - halfpel
    int             inherit_mv;     ///< tells if motion vector is inherited from reference macroblock
    int             inherit_qdelta; ///< tells if quantiser delta is inherited from reference macroblock
    int             qdelta_present; ///< tells if Qdelta signal is present in the bitstream (Indeo5 only)
    int             quant_mat;      ///< dequant matrix index
    int             glob_quant;     ///< quant base for this band
    const uint8_t   *scan;          ///< ptr to the scan pattern
    int             scan_size;      ///< size of the scantable

    IVIHuffTab      blk_vlc;        ///< vlc table for decoding block data

    int             num_corr;       ///< number of correction entries
    uint8_t         corr[61*2];     ///< rvmap correction pairs
    int             rvmap_sel;      ///< rvmap table selector
    RVMapDesc       *rv_map;        ///< ptr to the RLE table for this band
    int             num_tiles;      ///< number of tiles in this band
    IVITile         *tiles;         ///< array of tile descriptors
    InvTransformPtr *inv_transform;
    int             transform_size;
    DCTransformPtr  *dc_transform;
    int             is_2d_trans;    ///< 1 indicates that the two-dimensional inverse transform is used
    int32_t         checksum;       ///< for debug purposes
    int             checksum_present;
    int             bufsize;        ///< band buffer size in bytes
    const uint16_t  *intra_base;    ///< quantization matrix for intra blocks
    const uint16_t  *inter_base;    ///< quantization matrix for inter blocks
    const uint8_t   *intra_scale;   ///< quantization coefficient for intra blocks
    const uint8_t   *inter_scale;   ///< quantization coefficient for inter blocks
} IVIBandDesc;


/**
 *  color plane (luma or chroma) information
 */
typedef struct IVIPlaneDesc {
    uint16_t    width;
    uint16_t    height;
    uint8_t     num_bands;  ///< number of bands this plane subdivided into
    IVIBandDesc *bands;     ///< array of band descriptors
} IVIPlaneDesc;


typedef struct IVIPicConfig {
    uint16_t    pic_width;
    uint16_t    pic_height;
    uint16_t    chroma_width;
    uint16_t    chroma_height;
    uint16_t    tile_width;
    uint16_t    tile_height;
    uint8_t     luma_bands;
    uint8_t     chroma_bands;
} IVIPicConfig;

typedef struct IVI45DecContext {
    GetBitContext   gb;
    RVMapDesc       rvmap_tabs[9];   ///< local corrected copy of the static rvmap tables

    uint32_t        frame_num;
    int             frame_type;
    int             prev_frame_type; ///< frame type of the previous frame
    uint32_t        data_size;       ///< size of the frame data in bytes from picture header
    int             is_scalable;
    int             transp_status;   ///< transparency mode status: 1 - enabled
    const uint8_t   *frame_data;     ///< input frame data pointer
    int             inter_scal;      ///< signals a sequence of scalable inter frames
    uint32_t        frame_size;      ///< frame size in bytes
    uint32_t        pic_hdr_size;    ///< picture header size in bytes
    uint8_t         frame_flags;
    uint16_t        checksum;        ///< frame checksum

    IVIPicConfig    pic_conf;
    IVIPlaneDesc    planes[3];       ///< color planes

    int             buf_switch;      ///< used to switch between three buffers
    int             dst_buf;         ///< buffer index for the currently decoded frame
    int             ref_buf;         ///< inter frame reference buffer index
    int             ref2_buf;        ///< temporal storage for switching buffers
    int             b_ref_buf;       ///< second reference frame buffer index

    IVIHuffTab      mb_vlc;          ///< current macroblock table descriptor
    IVIHuffTab      blk_vlc;         ///< current block table descriptor

    uint8_t         rvmap_sel;
    uint8_t         in_imf;
    uint8_t         in_q;            ///< flag for explicitly stored quantiser delta
    uint8_t         pic_glob_quant;
    uint8_t         unknown1;

    uint16_t        gop_hdr_size;
    uint8_t         gop_flags;
    uint32_t        lock_word;

#if IVI4_STREAM_ANALYSER
    uint8_t         has_b_frames;
    uint8_t         has_transp;
    uint8_t         uses_tiling;
    uint8_t         uses_haar;
    uint8_t         uses_fullpel;
#endif

    int             (*decode_pic_hdr)  (struct IVI45DecContext *ctx, AVCodecContext *avctx);
    int             (*decode_band_hdr) (struct IVI45DecContext *ctx, IVIBandDesc *band, AVCodecContext *avctx);
    int             (*decode_mb_info)  (struct IVI45DecContext *ctx, IVIBandDesc *band, IVITile *tile, AVCodecContext *avctx);
    void            (*switch_buffers)  (struct IVI45DecContext *ctx);
    int             (*is_nonnull_frame)(struct IVI45DecContext *ctx);

    int gop_invalid;
    int buf_invalid[4];

    int is_indeo4;

    AVFrame         *p_frame;
    int             got_p_frame;
} IVI45DecContext;

/** compare some properties of two pictures */
static inline int ivi_pic_config_cmp(IVIPicConfig *str1, IVIPicConfig *str2)
{
    return str1->pic_width    != str2->pic_width    || str1->pic_height    != str2->pic_height    ||
           str1->chroma_width != str2->chroma_width || str1->chroma_height != str2->chroma_height ||
           str1->tile_width   != str2->tile_width   || str1->tile_height   != str2->tile_height   ||
           str1->luma_bands   != str2->luma_bands   || str1->chroma_bands  != str2->chroma_bands;
}

/** calculate number of tiles in a stride */
#define IVI_NUM_TILES(stride, tile_size) (((stride) + (tile_size) - 1) / (tile_size))

/** calculate number of macroblocks in a tile */
#define IVI_MBs_PER_TILE(tile_width, tile_height, mb_size) \
    ((((tile_width) + (mb_size) - 1) / (mb_size)) * (((tile_height) + (mb_size) - 1) / (mb_size)))

/** convert unsigned values into signed ones (the sign is in the LSB) */
#define IVI_TOSIGNED(val) (-(((val) >> 1) ^ -((val) & 1)))

/** scale motion vector */
static inline int ivi_scale_mv(int mv, int mv_scale)
{
    return (mv + (mv > 0) + (mv_scale - 1)) >> mv_scale;
}

/**
 * Initialize static codes used for macroblock and block decoding.
 */
void ff_ivi_init_static_vlc(void);

/**
 *  Decode a huffman codebook descriptor from the bitstream
 *  and select specified huffman table.
 *
 *  @param[in,out]  gb          the GetBit context
 *  @param[in]      desc_coded  flag signalling if table descriptor was coded
 *  @param[in]      which_tab   codebook purpose (IVI_MB_HUFF or IVI_BLK_HUFF)
 *  @param[out]     huff_tab    pointer to the descriptor of the selected table
 *  @param[in]      avctx       AVCodecContext pointer
 *  @return             zero on success, negative value otherwise
 */
int  ff_ivi_dec_huff_desc(GetBitContext *gb, int desc_coded, int which_tab,
                          IVIHuffTab *huff_tab, AVCodecContext *avctx);

/**
 *  Initialize planes (prepares descriptors, allocates buffers etc).
 *
 *  @param[in,out]  planes     pointer to the array of the plane descriptors
 *  @param[in]      cfg        pointer to the ivi_pic_config structure describing picture layout
 *  @param[in]      is_indeo4  flag signalling if it is Indeo 4 or not
 *  @return             result code: 0 - OK
 */
int  ff_ivi_init_planes(IVIPlaneDesc *planes, const IVIPicConfig *cfg,
                        int is_indeo4);

/**
 *  Initialize tile and macroblock descriptors.
 *
 *  @param[in,out]  planes       pointer to the array of the plane descriptors
 *  @param[in]      tile_width   tile width
 *  @param[in]      tile_height  tile height
 *  @return             result code: 0 - OK
 */
int  ff_ivi_init_tiles(IVIPlaneDesc *planes, int tile_width, int tile_height);

int ff_ivi_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
                        AVPacket *avpkt);
int ff_ivi_decode_close(AVCodecContext *avctx);

#endif /* AVCODEC_IVI_COMMON_H */
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* common functions for Indeo Video Interactive codecs (Indeo4 and Indeo5)
	3	*
	4	* Copyright (c) 2009 Maxim Poliakovski
	5	*
	6	* This file is part of FFmpeg.
	7	*
	8	* FFmpeg is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU Lesser General Public
	10	* License as published by the Free Software Foundation; either
	11	* version 2.1 of the License, or (at your option) any later version.
	12	*
	13	* FFmpeg is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	* Lesser General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU Lesser General Public
	19	* License along with FFmpeg; if not, write to the Free Software
	20	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	21	*/
	22
	23	/**
	24	* @file
	25	* This file contains structures and macros shared by both Indeo4 and
	26	* Indeo5 decoders.
	27	*/
	28
	29	#ifndef AVCODEC_IVI_COMMON_H
	30	#define AVCODEC_IVI_COMMON_H
	31
	32	#include "avcodec.h"
	33	#include "get_bits.h"
	34	#include <stdint.h>
	35
	36	/**
	37	* Indeo 4 frame types.
	38	*/
	39	enum {
	40	IVI4_FRAMETYPE_INTRA = 0,
	41	IVI4_FRAMETYPE_INTRA1 = 1, ///< intra frame with slightly different bitstream coding
	42	IVI4_FRAMETYPE_INTER = 2, ///< non-droppable P-frame
	43	IVI4_FRAMETYPE_BIDIR = 3, ///< bidirectional frame
	44	IVI4_FRAMETYPE_INTER_NOREF = 4, ///< droppable P-frame
	45	IVI4_FRAMETYPE_NULL_FIRST = 5, ///< empty frame with no data
	46	IVI4_FRAMETYPE_NULL_LAST = 6 ///< empty frame with no data
	47	};
	48
	49	#define IVI_VLC_BITS 13 ///< max number of bits of the ivi's huffman codes
	50	#define IVI4_STREAM_ANALYSER 0
	51	#define IVI5_IS_PROTECTED 0x20
	52
	53	/**
	54	* huffman codebook descriptor
	55	*/
	56	typedef struct IVIHuffDesc {
	57	int32_t num_rows;
	58	uint8_t xbits[16];
	59	} IVIHuffDesc;
	60
	61	/**
	62	* macroblock/block huffman table descriptor
	63	*/
	64	typedef struct IVIHuffTab {
65	int32_t tab_sel; /// index of one of the predefined tables
66	/// or "7" for custom one
67	VLC *tab; /// pointer to the table associated with tab_sel
68
69	/// the following are used only when tab_sel == 7
70	IVIHuffDesc cust_desc; /// custom Huffman codebook descriptor
71	VLC cust_tab; /// vlc table for custom codebook
72	} IVIHuffTab;
73
74	enum {
75	IVI_MB_HUFF = 0, /// Huffman table is used for coding macroblocks
76	IVI_BLK_HUFF = 1 /// Huffman table is used for coding blocks
77	};
78
79
80	/**
81	* Common scan patterns (defined in ivi_common.c)
82	*/
83	extern const uint8_t ff_ivi_vertical_scan_8x8[64];
84	extern const uint8_t ff_ivi_horizontal_scan_8x8[64];
85	extern const uint8_t ff_ivi_direct_scan_4x4[16];
86
87
88	/**
89	* Declare inverse transform function types
90	*/
91	typedef void (InvTransformPtr)(const int32_t in, int16_t out, uint32_t pitch, const uint8_t *flags);
92	typedef void (DCTransformPtr) (const int32_t in, int16_t out, uint32_t pitch, int blk_size);
93
94
95	/**
96	* run-value (RLE) table descriptor
97	*/
98	typedef struct RVMapDesc {
99	uint8_t eob_sym; ///< end of block symbol
100	uint8_t esc_sym; ///< escape symbol
101	uint8_t runtab[256];
102	int8_t valtab[256];
103	} RVMapDesc;
104
105	extern const RVMapDesc ff_ivi_rvmap_tabs[9];
106
107
108	/**
109	* information for Indeo macroblock (16x16, 8x8 or 4x4)
110	*/
111	typedef struct IVIMbInfo {
112	int16_t xpos;
113	int16_t ypos;
114	uint32_t buf_offs; ///< address in the output buffer for this mb
115	uint8_t type; ///< macroblock type: 0 - INTRA, 1 - INTER
116	uint8_t cbp; ///< coded block pattern
117	int8_t q_delta; ///< quant delta
118	int8_t mv_x; ///< motion vector (x component)
119	int8_t mv_y; ///< motion vector (y component)
120	int8_t b_mv_x; ///< second motion vector (x component)
121	int8_t b_mv_y; ///< second motion vector (y component)
122	} IVIMbInfo;
123
124
125	/**
126	* information for Indeo tile
127	*/
128	typedef struct IVITile {
129	int xpos;
130	int ypos;
131	int width;
132	int height;
133	int mb_size;
134	int is_empty; ///< = 1 if this tile doesn't contain any data
135	int data_size; ///< size of the data in bytes
136	int num_MBs; ///< number of macroblocks in this tile
137	IVIMbInfo *mbs; ///< array of macroblock descriptors
138	IVIMbInfo *ref_mbs; ///< ptr to the macroblock descriptors of the reference tile
139	} IVITile;
140
141
142	/**
143	* information for Indeo wavelet band
144	*/
145	typedef struct IVIBandDesc {
146	int plane; ///< plane number this band belongs to
147	int band_num; ///< band number
148	int width;
149	int height;
150	int aheight; ///< aligned band height
151	const uint8_t *data_ptr; ///< ptr to the first byte of the band data
152	int data_size; ///< size of the band data
153	int16_t *buf; ///< pointer to the output buffer for this band
154	int16_t *ref_buf; ///< pointer to the reference frame buffer (for motion compensation)
155	int16_t *b_ref_buf; ///< pointer to the second reference frame buffer (for motion compensation)
156	int16_t *bufs[4]; ///< array of pointers to the band buffers
157	int pitch; ///< pitch associated with the buffers above
158	int is_empty; ///< = 1 if this band doesn't contain any data
159	int mb_size; ///< macroblock size
160	int blk_size; ///< block size
161	int is_halfpel; ///< precision of the motion compensation: 0 - fullpel, 1 - halfpel
162	int inherit_mv; ///< tells if motion vector is inherited from reference macroblock
163	int inherit_qdelta; ///< tells if quantiser delta is inherited from reference macroblock
164	int qdelta_present; ///< tells if Qdelta signal is present in the bitstream (Indeo5 only)
165	int quant_mat; ///< dequant matrix index
166	int glob_quant; ///< quant base for this band
167	const uint8_t *scan; ///< ptr to the scan pattern
168	int scan_size; ///< size of the scantable
169
170	IVIHuffTab blk_vlc; ///< vlc table for decoding block data
171
172	int num_corr; ///< number of correction entries
173	uint8_t corr[61*2]; ///< rvmap correction pairs
174	int rvmap_sel; ///< rvmap table selector
175	RVMapDesc *rv_map; ///< ptr to the RLE table for this band
176	int num_tiles; ///< number of tiles in this band
177	IVITile *tiles; ///< array of tile descriptors
178	InvTransformPtr *inv_transform;
179	int transform_size;
180	DCTransformPtr *dc_transform;
181	int is_2d_trans; ///< 1 indicates that the two-dimensional inverse transform is used
182	int32_t checksum; ///< for debug purposes
183	int checksum_present;
184	int bufsize; ///< band buffer size in bytes
185	const uint16_t *intra_base; ///< quantization matrix for intra blocks
186	const uint16_t *inter_base; ///< quantization matrix for inter blocks
187	const uint8_t *intra_scale; ///< quantization coefficient for intra blocks
188	const uint8_t *inter_scale; ///< quantization coefficient for inter blocks
189	} IVIBandDesc;
190
191
192	/**
193	* color plane (luma or chroma) information
194	*/
195	typedef struct IVIPlaneDesc {
196	uint16_t width;
197	uint16_t height;
198	uint8_t num_bands; ///< number of bands this plane subdivided into
199	IVIBandDesc *bands; ///< array of band descriptors
200	} IVIPlaneDesc;
201
202
203	typedef struct IVIPicConfig {
204	uint16_t pic_width;
205	uint16_t pic_height;
206	uint16_t chroma_width;
207	uint16_t chroma_height;
208	uint16_t tile_width;
209	uint16_t tile_height;
210	uint8_t luma_bands;
211	uint8_t chroma_bands;
212	} IVIPicConfig;
213
214	typedef struct IVI45DecContext {
215	GetBitContext gb;
216	RVMapDesc rvmap_tabs[9]; ///< local corrected copy of the static rvmap tables
217
218	uint32_t frame_num;
219	int frame_type;
220	int prev_frame_type; ///< frame type of the previous frame
221	uint32_t data_size; ///< size of the frame data in bytes from picture header
222	int is_scalable;
223	int transp_status; ///< transparency mode status: 1 - enabled
224	const uint8_t *frame_data; ///< input frame data pointer
225	int inter_scal; ///< signals a sequence of scalable inter frames
226	uint32_t frame_size; ///< frame size in bytes
227	uint32_t pic_hdr_size; ///< picture header size in bytes
228	uint8_t frame_flags;
229	uint16_t checksum; ///< frame checksum
230
231	IVIPicConfig pic_conf;
232	IVIPlaneDesc planes[3]; ///< color planes
233
234	int buf_switch; ///< used to switch between three buffers
235	int dst_buf; ///< buffer index for the currently decoded frame
236	int ref_buf; ///< inter frame reference buffer index
237	int ref2_buf; ///< temporal storage for switching buffers
238	int b_ref_buf; ///< second reference frame buffer index
239
240	IVIHuffTab mb_vlc; ///< current macroblock table descriptor
241	IVIHuffTab blk_vlc; ///< current block table descriptor
242
243	uint8_t rvmap_sel;
244	uint8_t in_imf;
245	uint8_t in_q; ///< flag for explicitly stored quantiser delta
246	uint8_t pic_glob_quant;
247	uint8_t unknown1;
248
249	uint16_t gop_hdr_size;
250	uint8_t gop_flags;
251	uint32_t lock_word;
252
253	#if IVI4_STREAM_ANALYSER
254	uint8_t has_b_frames;
255	uint8_t has_transp;
256	uint8_t uses_tiling;
257	uint8_t uses_haar;
258	uint8_t uses_fullpel;
259	#endif
260
261	int (decode_pic_hdr) (struct IVI45DecContext ctx, AVCodecContext *avctx);
262	int (decode_band_hdr) (struct IVI45DecContext ctx, IVIBandDesc band, AVCodecContext avctx);
263	int (decode_mb_info) (struct IVI45DecContext ctx, IVIBandDesc band, IVITile tile, AVCodecContext *avctx);
264	void (switch_buffers) (struct IVI45DecContext ctx);
265	int (is_nonnull_frame)(struct IVI45DecContext ctx);
266
267	int gop_invalid;
268	int buf_invalid[4];
269
270	int is_indeo4;
271
272	AVFrame *p_frame;
273	int got_p_frame;
274	} IVI45DecContext;
275
276	/** compare some properties of two pictures */
277	static inline int ivi_pic_config_cmp(IVIPicConfig str1, IVIPicConfig str2)
278	{
279	return str1->pic_width != str2->pic_width \|\| str1->pic_height != str2->pic_height \|\|
280	str1->chroma_width != str2->chroma_width \|\| str1->chroma_height != str2->chroma_height \|\|
281	str1->tile_width != str2->tile_width \|\| str1->tile_height != str2->tile_height \|\|
282	str1->luma_bands != str2->luma_bands \|\| str1->chroma_bands != str2->chroma_bands;
283	}
284
285	/** calculate number of tiles in a stride */
286	#define IVI_NUM_TILES(stride, tile_size) (((stride) + (tile_size) - 1) / (tile_size))
287
288	/** calculate number of macroblocks in a tile */
289	#define IVI_MBs_PER_TILE(tile_width, tile_height, mb_size) \
290	((((tile_width) + (mb_size) - 1) / (mb_size)) * (((tile_height) + (mb_size) - 1) / (mb_size)))
291
292	/** convert unsigned values into signed ones (the sign is in the LSB) */
293	#define IVI_TOSIGNED(val) (-(((val) >> 1) ^ -((val) & 1)))
294
295	/** scale motion vector */
296	static inline int ivi_scale_mv(int mv, int mv_scale)
297	{
298	return (mv + (mv > 0) + (mv_scale - 1)) >> mv_scale;
299	}
300
301	/**
302	* Initialize static codes used for macroblock and block decoding.
303	*/
304	void ff_ivi_init_static_vlc(void);
305
306	/**
307	* Decode a huffman codebook descriptor from the bitstream
308	* and select specified huffman table.
309	*
310	* @param[in,out] gb the GetBit context
311	* @param[in] desc_coded flag signalling if table descriptor was coded
312	* @param[in] which_tab codebook purpose (IVI_MB_HUFF or IVI_BLK_HUFF)
313	* @param[out] huff_tab pointer to the descriptor of the selected table
314	* @param[in] avctx AVCodecContext pointer
315	* @return zero on success, negative value otherwise
316	*/
317	int ff_ivi_dec_huff_desc(GetBitContext *gb, int desc_coded, int which_tab,
318	IVIHuffTab huff_tab, AVCodecContext avctx);
319
320	/**
321	* Initialize planes (prepares descriptors, allocates buffers etc).
322	*
323	* @param[in,out] planes pointer to the array of the plane descriptors
324	* @param[in] cfg pointer to the ivi_pic_config structure describing picture layout
325	* @param[in] is_indeo4 flag signalling if it is Indeo 4 or not
326	* @return result code: 0 - OK
327	*/
328	int ff_ivi_init_planes(IVIPlaneDesc planes, const IVIPicConfig cfg,
329	int is_indeo4);
330
331	/**
332	* Initialize tile and macroblock descriptors.
333	*
334	* @param[in,out] planes pointer to the array of the plane descriptors
335	* @param[in] tile_width tile width
336	* @param[in] tile_height tile height
337	* @return result code: 0 - OK
338	*/
339	int ff_ivi_init_tiles(IVIPlaneDesc *planes, int tile_width, int tile_height);
340
341	int ff_ivi_decode_frame(AVCodecContext avctx, void data, int *got_frame,
342	AVPacket *avpkt);
343	int ff_ivi_decode_close(AVCodecContext *avctx);
344
345	#endif /* AVCODEC_IVI_COMMON_H */