mirror of https://git.ffmpeg.org/ffmpeg.git
324 lines
12 KiB
C
324 lines
12 KiB
C
/*
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* common functions for Indeo Video Interactive codecs (Indeo4 and Indeo5)
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*
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* Copyright (c) 2009 Maxim Poliakovski
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file libavcodec/ivi_common.h
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* This file contains structures and macros shared by both Indeo4 and
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* Indeo5 decoders.
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*/
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#ifndef AVCODEC_IVI_COMMON_H
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#define AVCODEC_IVI_COMMON_H
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#include "avcodec.h"
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#include "get_bits.h"
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#include <stdint.h>
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#define IVI_DEBUG 0
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#define IVI_VLC_BITS 13 ///< max number of bits of the ivi's huffman codes
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/**
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* huffman codebook descriptor
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*/
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typedef struct {
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int32_t num_rows;
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uint8_t xbits[16];
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} IVIHuffDesc;
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extern VLC ff_ivi_mb_vlc_tabs [8]; ///< static macroblock Huffman tables
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extern VLC ff_ivi_blk_vlc_tabs[8]; ///< static block Huffman tables
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/**
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* run-value (RLE) table descriptor
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*/
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typedef struct {
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uint8_t eob_sym; ///< end of block symbol
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uint8_t esc_sym; ///< escape symbol
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uint8_t runtab[256];
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int8_t valtab[256];
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} RVMapDesc;
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extern const RVMapDesc ff_ivi_rvmap_tabs[9];
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/**
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* information for Indeo macroblock (16x16, 8x8 or 4x4)
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*/
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typedef struct {
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int16_t xpos;
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int16_t ypos;
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uint32_t buf_offs; ///< address in the output buffer for this mb
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uint8_t type; ///< macroblock type: 0 - INTRA, 1 - INTER
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uint8_t cbp; ///< coded block pattern
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uint8_t q_delta; ///< quant delta
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int8_t mv_x; ///< motion vector (x component)
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int8_t mv_y; ///< motion vector (y component)
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} IVIMbInfo;
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/**
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* information for Indeo tile
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*/
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typedef struct {
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int xpos;
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int ypos;
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int width;
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int height;
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int is_empty; ///< = 1 if this tile doesn't contain any data
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int data_size; ///< size of the data in bytes
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int num_MBs; ///< number of macroblocks in this tile
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IVIMbInfo *mbs; ///< array of macroblock descriptors
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IVIMbInfo *ref_mbs; ///< ptr to the macroblock descriptors of the reference tile
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} IVITile;
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/**
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* information for Indeo wavelet band
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*/
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typedef struct {
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int plane; ///< plane number this band belongs to
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int band_num; ///< band number
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int width;
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int height;
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const uint8_t *data_ptr; ///< ptr to the first byte of the band data
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int data_size; ///< size of the band data
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int16_t *buf; ///< pointer to the output buffer for this band
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int16_t *ref_buf; ///< pointer to the reference frame buffer (for motion compensation)
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int16_t *bufs[3]; ///< array of pointers to the band buffers
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int pitch; ///< pitch associated with the buffers above
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int is_empty; ///< = 1 if this band doesn't contain any data
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int mb_size; ///< macroblock size
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int blk_size; ///< block size
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int is_halfpel; ///< precision of the motion compensation: 0 - fullpel, 1 - halfpel
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int inherit_mv; ///< tells if motion vector is inherited from reference macroblock
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int inherit_qdelta; ///< tells if quantiser delta is inherited from reference macroblock
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int qdelta_present; ///< tells if Qdelta signal is present in the bitstream (Indeo5 only)
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int quant_mat; ///< dequant matrix index
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int glob_quant; ///< quant base for this band
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const uint8_t *scan; ///< ptr to the scan pattern
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int huff_sel; ///< huffman table for this band
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IVIHuffDesc huff_desc; ///< table descriptor associated with the selector above
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VLC *blk_vlc; ///< ptr to the vlc table for decoding block data
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VLC blk_vlc_cust; ///< custom block vlc table
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uint16_t *dequant_intra; ///< ptr to dequant tables for intra blocks
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uint16_t *dequant_inter; ///< ptr dequant tables for inter blocks
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int num_corr; ///< number of correction entries
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uint8_t corr[61*2]; ///< rvmap correction pairs
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int rvmap_sel; ///< rvmap table selector
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RVMapDesc *rv_map; ///< ptr to the RLE table for this band
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int num_tiles; ///< number of tiles in this band
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IVITile *tiles; ///< array of tile descriptors
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void (*inv_transform)(const int32_t *in, int16_t *out, uint32_t pitch, const uint8_t *flags); ///< inverse transform function pointer
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void (*dc_transform) (const int32_t *in, int16_t *out, uint32_t pitch, int blk_size); ///< dc transform function pointer, it may be NULL
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int is_2d_trans; ///< 1 indicates that the two-dimensional inverse transform is used
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int32_t checksum; ///< for debug purposes
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int checksum_present;
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int bufsize; ///< band buffer size in bytes
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const uint8_t *intra_base; ///< quantization matrix for intra blocks
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const uint8_t *inter_base; ///< quantization matrix for inter blocks
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const uint8_t *intra_scale; ///< quantization coefficient for intra blocks
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const uint8_t *inter_scale; ///< quantization coefficient for inter blocks
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} IVIBandDesc;
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/**
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* color plane (luma or chroma) information
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*/
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typedef struct {
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uint16_t width;
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uint16_t height;
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uint8_t num_bands; ///< number of bands this plane subdivided into
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IVIBandDesc *bands; ///< array of band descriptors
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} IVIPlaneDesc;
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typedef struct {
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uint16_t pic_width;
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uint16_t pic_height;
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uint16_t chroma_width;
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uint16_t chroma_height;
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uint16_t tile_width;
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uint16_t tile_height;
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uint8_t luma_bands;
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uint8_t chroma_bands;
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} IVIPicConfig;
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/** compares some properties of two pictures */
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static inline int ivi_pic_config_cmp(IVIPicConfig *str1, IVIPicConfig *str2)
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{
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return (str1->pic_width != str2->pic_width || str1->pic_height != str2->pic_height ||
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str1->chroma_width != str2->chroma_width || str1->chroma_height != str2->chroma_height ||
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str1->tile_width != str2->tile_width || str1->tile_height != str2->tile_height ||
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str1->luma_bands != str2->luma_bands || str1->chroma_bands != str2->chroma_bands);
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}
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/** calculate number of tiles in a stride */
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#define IVI_NUM_TILES(stride, tile_size) (((stride) + (tile_size) - 1) / (tile_size))
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/** calculate number of macroblocks in a tile */
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#define IVI_MBs_PER_TILE(tile_width, tile_height, mb_size) \
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((((tile_width) + (mb_size) - 1) / (mb_size)) * (((tile_height) + (mb_size) - 1) / (mb_size)))
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/** convert unsigned values into signed ones (the sign is in the LSB) */
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#define IVI_TOSIGNED(val) (-(((val) >> 1) ^ -((val) & 1)))
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/** scales motion vector */
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static inline int ivi_scale_mv(int mv, int mv_scale)
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{
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return (mv + (mv > 0) + (mv_scale - 1)) >> mv_scale;
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}
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/**
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* Generates a huffman codebook from the given descriptor
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* and converts it into the FFmpeg VLC table.
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*
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* @param cb [in] pointer to codebook descriptor
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* @param vlc [out] where to place the generated VLC table
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* @param flag [in] flag: 1 - for static or 0 for dynamic tables
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* @return result code: 0 - OK, -1 = error (invalid codebook descriptor)
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*/
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int ff_ivi_create_huff_from_desc(const IVIHuffDesc *cb, VLC *vlc, int flag);
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/**
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* Initializes static codes used for macroblock and block decoding.
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*/
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void ff_ivi_init_static_vlc();
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/**
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* Decodes a huffman codebook descriptor from the bitstream.
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*
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* @param gb [in,out] the GetBit context
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* @param desc [out] ptr to descriptor to be filled with data
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* @return selector indicating huffman table:
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* (0...6 - predefined, 7 - custom one supplied with the bitstream)
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*/
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int ff_ivi_dec_huff_desc(GetBitContext *gb, IVIHuffDesc *desc);
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/**
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* Compares two huffman codebook descriptors.
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*
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* @param desc1 [in] ptr to the 1st descriptor to compare
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* @param desc2 [in] ptr to the 2nd descriptor to compare
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* @return comparison result: 0 - equal, 1 - not equal
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*/
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int ff_ivi_huff_desc_cmp(const IVIHuffDesc *desc1, const IVIHuffDesc *desc2);
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/**
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* Copies huffman codebook descriptors.
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*
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* @param dst [out] ptr to the destination descriptor
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* @param src [in] ptr to the source descriptor
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*/
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void ff_ivi_huff_desc_copy(IVIHuffDesc *dst, const IVIHuffDesc *src);
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/**
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* Initializes planes (prepares descriptors, allocates buffers etc).
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*
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* @param planes [in,out] pointer to the array of the plane descriptors
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* @param cfg [in] pointer to the ivi_pic_config structure describing picture layout
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* @return result code: 0 - OK
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*/
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int ff_ivi_init_planes(IVIPlaneDesc *planes, const IVIPicConfig *cfg);
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/**
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* Frees planes, bands and macroblocks buffers.
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*
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* @param planes [in] pointer to the array of the plane descriptors
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*/
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void ff_ivi_free_buffers(IVIPlaneDesc *planes);
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/**
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* Initializes tile and macroblock descriptors.
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*
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* @param planes [in,out] pointer to the array of the plane descriptors
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* @param tile_width [in] tile width
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* @param tile_height [in] tile height
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* @return result code: 0 - OK
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*/
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int ff_ivi_init_tiles(IVIPlaneDesc *planes, int tile_width, int tile_height);
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/**
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* Decodes size of the tile data.
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* The size is stored as a variable-length field having the following format:
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* if (tile_data_size < 255) than this field is only one byte long
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* if (tile_data_size >= 255) than this field four is byte long: 0xFF X1 X2 X3
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* where X1-X3 is size of the tile data
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*
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* @param gb [in,out] the GetBit context
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* @return size of the tile data in bytes
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*/
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int ff_ivi_dec_tile_data_size(GetBitContext *gb);
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/**
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* Decodes block data:
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* extracts huffman-coded transform coefficients from the bitstream,
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* dequantizes them, applies inverse transform and motion compensation
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* in order to reconstruct the picture.
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*
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* @param gb [in,out] the GetBit context
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* @param band [in] pointer to the band descriptor
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* @param tile [in] pointer to the tile descriptor
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* @return result code: 0 - OK, -1 = error (corrupted blocks data)
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*/
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int ff_ivi_decode_blocks(GetBitContext *gb, IVIBandDesc *band, IVITile *tile);
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/**
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* Handles empty tiles by performing data copying and motion
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* compensation respectively.
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*
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* @param avctx [in] ptr to the AVCodecContext
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* @param band [in] pointer to the band descriptor
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* @param tile [in] pointer to the tile descriptor
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* @param mv_scale [in] scaling factor for motion vectors
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*/
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void ff_ivi_process_empty_tile(AVCodecContext *avctx, IVIBandDesc *band,
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IVITile *tile, int32_t mv_scale);
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/**
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* Converts and outputs the current plane.
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* This conversion is done by adding back the bias value of 128
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* (subtracted in the encoder) and clipping the result.
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*
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* @param plane [in] pointer to the descriptor of the plane being processed
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* @param dst [out] pointer to the buffer receiving converted pixels
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* @param dst_pitch [in] pitch for moving to the next y line
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*/
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void ff_ivi_output_plane(IVIPlaneDesc *plane, uint8_t *dst, int dst_pitch);
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#if IVI_DEBUG
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/**
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* Calculates band checksum from band data.
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*/
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uint16_t ivi_calc_band_checksum (IVIBandDesc *band);
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/**
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* Verifies that band data lies in range.
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*/
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int ivi_check_band (IVIBandDesc *band, const uint8_t *ref, int pitch);
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#endif
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#endif /* AVCODEC_IVI_COMMON_H */
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