Indeo Video Interactive 4 and 5 common code and DSP functions.

Reviewed and corrected by myself because there were no other volunteers in the
last weeks.

Originally committed as revision 21531 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 319 insertions, 0 deletions

diff --git a/libavcodec/ivi_common.h b/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 libavcodec/ivi_common.h
+ * 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;
+
+extern const IVIHuffDesc ff_ivi_mb_huff_desc[8];  ///< static macroblock huffman tables
+extern const IVIHuffDesc ff_ivi_blk_huff_desc[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
+    uint8_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
+
+    int             huff_sel;       ///< huffman table for this band
+    IVIHuffDesc     huff_desc;      ///< table descriptor associated with the selector above
+    VLC             *blk_vlc;       ///< ptr to the vlc table for decoding block data
+    VLC             blk_vlc_cust;   ///< custom block vlc table
+
+    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) */
+/* TODO: find a way to calculate this without the conditional using bit magic */
+#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);
+
+/**
+ *  Decodes a huffman codebook descriptor from the bitstream.
+ *
+ *  @param gb   [in,out] the GetBit context
+ *  @param desc [out] ptr to descriptor to be filled with data
+ *  @return     selector indicating huffman table:
+ *              (0...6 - predefined, 7 - custom one supplied with the bitstream)
+ */
+int  ff_ivi_dec_huff_desc(GetBitContext *gb, IVIHuffDesc *desc);
+
+/**
+ *  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 */