/* * common functions for Indeo Video Interactive codecs (Indeo4 and Indeo5) * * Copyright (c) 2009 Maxim Poliakovski * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; 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 #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 /** * 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 { 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; 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 *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 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; 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 { 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; /** 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; } /** * Generate a huffman codebook from the given descriptor * and convert it into the Libav VLC table. * * @param[in] cb pointer to codebook descriptor * @param[out] vlc where to place the generated VLC table * @param[in] flag 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); /** * 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); /** * Compare two huffman codebook descriptors. * * @param[in] desc1 ptr to the 1st descriptor to compare * @param[in] desc2 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); /** * Copy huffman codebook descriptors. * * @param[out] dst ptr to the destination descriptor * @param[in] src ptr to the source descriptor */ void ff_ivi_huff_desc_copy(IVIHuffDesc *dst, const IVIHuffDesc *src); /** * 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 * @return result code: 0 - OK */ int ff_ivi_init_planes(IVIPlaneDesc *planes, const IVIPicConfig *cfg); /** * Free planes, bands and macroblocks buffers. * * @param[in] planes pointer to the array of the plane descriptors */ void ff_ivi_free_buffers(IVIPlaneDesc *planes); /** * 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); /** * Decode 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[in,out] gb the GetBit context * @return size of the tile data in bytes */ int ff_ivi_dec_tile_data_size(GetBitContext *gb); /** * Decode block data: * extract huffman-coded transform coefficients from the bitstream, * dequantize them, apply inverse transform and motion compensation * in order to reconstruct the picture. * * @param[in,out] gb the GetBit context * @param[in] band pointer to the band descriptor * @param[in] tile 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); /** * Handle empty tiles by performing data copying and motion * compensation respectively. * * @param[in] avctx ptr to the AVCodecContext * @param[in] band pointer to the band descriptor * @param[in] tile pointer to the tile descriptor * @param[in] mv_scale scaling factor for motion vectors */ int ff_ivi_process_empty_tile(AVCodecContext *avctx, IVIBandDesc *band, IVITile *tile, int32_t mv_scale); /** * Convert and output the current plane. * This conversion is done by adding back the bias value of 128 * (subtracted in the encoder) and clipping the result. * * @param[in] plane pointer to the descriptor of the plane being processed * @param[out] dst pointer to the buffer receiving converted pixels * @param[in] dst_pitch pitch for moving to the next y line */ void ff_ivi_output_plane(IVIPlaneDesc *plane, uint8_t *dst, int dst_pitch); /** * Calculate band checksum from band data. */ uint16_t ivi_calc_band_checksum (IVIBandDesc *band); /** * Verify that band data lies in range. */ int ivi_check_band (IVIBandDesc *band, const uint8_t *ref, int pitch); #endif /* AVCODEC_IVI_COMMON_H */