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FFmpeg/libavcodec/ivi_common.h

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/*
* 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>
#define IVI_DEBUG 0
#define IVI_VLC_BITS 13 ///< max number of bits of the ivi's huffman codes
/**
* huffman codebook descriptor
*/
typedef struct {
int32_t num_rows;
uint8_t xbits[16];
} IVIHuffDesc;
/**
* macroblock/block huffman table descriptor
*/
typedef struct {
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
};
extern VLC ff_ivi_mb_vlc_tabs [8]; ///< static macroblock Huffman tables
extern VLC ff_ivi_blk_vlc_tabs[8]; ///< static block Huffman tables
/**
* run-value (RLE) table descriptor
*/
typedef struct {
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 {
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)
} IVIMbInfo;
/**
* information for Indeo tile
*/
typedef struct {
int xpos;
int ypos;
int width;
int height;
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 {
int plane; ///< plane number this band belongs to
int band_num; ///< band number
int width;
int 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 *bufs[3]; ///< 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
IVIHuffTab blk_vlc; ///< vlc table for decoding block data
uint16_t *dequant_intra; ///< ptr to dequant tables for intra blocks
uint16_t *dequant_inter; ///< ptr dequant tables for inter blocks
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
void (*inv_transform)(const int32_t *in, int16_t *out, uint32_t pitch, const uint8_t *flags); ///< inverse transform function pointer
void (*dc_transform) (const int32_t *in, int16_t *out, uint32_t pitch, int blk_size); ///< dc transform function pointer, it may be NULL
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 uint8_t *intra_base; ///< quantization matrix for intra blocks
const uint8_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 {
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 {
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;
/** compares 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)))
/** scales motion vector */
static inline int ivi_scale_mv(int mv, int mv_scale)
{
return (mv + (mv > 0) + (mv_scale - 1)) >> mv_scale;
}
/**
* Generates a huffman codebook from the given descriptor
* and converts it into the FFmpeg VLC table.
*
* @param cb [in] pointer to codebook descriptor
* @param vlc [out] where to place the generated VLC table
* @param flag [in] flag: 1 - for static or 0 for dynamic tables
* @return result code: 0 - OK, -1 = error (invalid codebook descriptor)
*/
int ff_ivi_create_huff_from_desc(const IVIHuffDesc *cb, VLC *vlc, int flag);
/**
* Initializes static codes used for macroblock and block decoding.
*/
void ff_ivi_init_static_vlc(void);
/**
* Decodes a huffman codebook descriptor from the bitstream
* and selects specified huffman table.
*
* @param gb [in,out] the GetBit context
* @param desc_coded [in] flag signalling if table descriptor was coded
* @param which_tab [in] codebook purpose (IVI_MB_HUFF or IVI_BLK_HUFF)
* @param huff_tab [out] pointer to the descriptor of the selected table
* @param avctx [in] 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);
/**
* Compares two huffman codebook descriptors.
*
* @param desc1 [in] ptr to the 1st descriptor to compare
* @param desc2 [in] ptr to the 2nd descriptor to compare
* @return comparison result: 0 - equal, 1 - not equal
*/
int ff_ivi_huff_desc_cmp(const IVIHuffDesc *desc1, const IVIHuffDesc *desc2);
/**
* Copies huffman codebook descriptors.
*
* @param dst [out] ptr to the destination descriptor
* @param src [in] ptr to the source descriptor
*/
void ff_ivi_huff_desc_copy(IVIHuffDesc *dst, const IVIHuffDesc *src);
/**
* Initializes planes (prepares descriptors, allocates buffers etc).
*
* @param planes [in,out] pointer to the array of the plane descriptors
* @param cfg [in] pointer to the ivi_pic_config structure describing picture layout
* @return result code: 0 - OK
*/
int ff_ivi_init_planes(IVIPlaneDesc *planes, const IVIPicConfig *cfg);
/**
* Frees planes, bands and macroblocks buffers.
*
* @param planes [in] pointer to the array of the plane descriptors
*/
void ff_ivi_free_buffers(IVIPlaneDesc *planes);
/**
* Initializes tile and macroblock descriptors.
*
* @param planes [in,out] pointer to the array of the plane descriptors
* @param tile_width [in] tile width
* @param tile_height [in] tile height
* @return result code: 0 - OK
*/
int ff_ivi_init_tiles(IVIPlaneDesc *planes, int tile_width, int tile_height);
/**
* Decodes size of the tile data.
* The size is stored as a variable-length field having the following format:
* if (tile_data_size < 255) than this field is only one byte long
* if (tile_data_size >= 255) than this field four is byte long: 0xFF X1 X2 X3
* where X1-X3 is size of the tile data
*
* @param gb [in,out] the GetBit context
* @return size of the tile data in bytes
*/
int ff_ivi_dec_tile_data_size(GetBitContext *gb);
/**
* Decodes block data:
* extracts huffman-coded transform coefficients from the bitstream,
* dequantizes them, applies inverse transform and motion compensation
* in order to reconstruct the picture.
*
* @param gb [in,out] the GetBit context
* @param band [in] pointer to the band descriptor
* @param tile [in] pointer to the tile descriptor
* @return result code: 0 - OK, -1 = error (corrupted blocks data)
*/
int ff_ivi_decode_blocks(GetBitContext *gb, IVIBandDesc *band, IVITile *tile);
/**
* Handles empty tiles by performing data copying and motion
* compensation respectively.
*
* @param avctx [in] ptr to the AVCodecContext
* @param band [in] pointer to the band descriptor
* @param tile [in] pointer to the tile descriptor
* @param mv_scale [in] scaling factor for motion vectors
*/
void ff_ivi_process_empty_tile(AVCodecContext *avctx, IVIBandDesc *band,
IVITile *tile, int32_t mv_scale);
/**
* Converts and outputs the current plane.
* This conversion is done by adding back the bias value of 128
* (subtracted in the encoder) and clipping the result.
*
* @param plane [in] pointer to the descriptor of the plane being processed
* @param dst [out] pointer to the buffer receiving converted pixels
* @param dst_pitch [in] pitch for moving to the next y line
*/
void ff_ivi_output_plane(IVIPlaneDesc *plane, uint8_t *dst, int dst_pitch);
#if IVI_DEBUG
/**
* Calculates band checksum from band data.
*/
uint16_t ivi_calc_band_checksum (IVIBandDesc *band);
/**
* Verifies that band data lies in range.
*/
int ivi_check_band (IVIBandDesc *band, const uint8_t *ref, int pitch);
#endif
#endif /* AVCODEC_IVI_COMMON_H */