2 * This file is part of FFmpeg.
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
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11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
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16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 #ifndef AVCODEC_INTRAX8_H
20 #define AVCODEC_INTRAX8_H
25 #include "intrax8dsp.h"
27 #include "mpegpicture.h"
29 typedef struct IntraX8Context {
30 VLC *j_ac_vlc[4]; // they point to the static j_mb_vlc
36 // set by ff_intrax8_common_init
37 uint8_t *prediction_table; // 2 * (mb_w * 2)
38 ScanTable scantable[3];
40 uint8_t idct_permutation[64];
41 AVCodecContext *avctx;
42 int *block_last_index; ///< last nonzero coefficient in block
45 // set by the caller codec
46 IntraX8DSPContext dsp;
56 // calculated per frame
58 int divide_quant_dc_luma;
59 int divide_quant_dc_chroma;
61 uint8_t scratchpad[42]; // size of the block is fixed (8x8 plus padding)
74 int mb_width, mb_height;
78 * Initialize IntraX8 frame decoder.
79 * @param avctx pointer to AVCodecContext
80 * @param w pointer to IntraX8Context
81 * @param idsp pointer to IDCTDSPContext
82 * @param block pointer to block array
83 * @param block_last_index pointer to index array
84 * @param mb_width macroblock width
85 * @param mb_height macroblock height
86 * @return 0 on success, a negative AVERROR value on error
88 int ff_intrax8_common_init(AVCodecContext *avctx,
89 IntraX8Context *w, IDCTDSPContext *idsp,
91 int block_last_index[12],
92 int mb_width, int mb_height);
95 * Destroy IntraX8 frame structure.
96 * @param w pointer to IntraX8Context
98 void ff_intrax8_common_end(IntraX8Context *w);
101 * Decode single IntraX8 frame.
102 * lowres decoding is theoretically impossible.
103 * @param w pointer to IntraX8Context
104 * @param pict the output Picture containing an AVFrame
105 * @param gb open bitstream reader
106 * @param mb_x pointer to the x coordinate of the current macroblock
107 * @param mb_y pointer to the y coordinate of the current macroblock
108 * @param dquant doubled quantizer, it would be odd in case of VC-1 halfpq==1.
109 * @param quant_offset offset away from zero
110 * @param loopfilter enable filter after decoding a block
112 int ff_intrax8_decode_picture(IntraX8Context *w, Picture *pict,
113 GetBitContext *gb, int *mb_x, int *mb_y,
114 int quant, int halfpq,
115 int loopfilter, int lowdelay);
117 #endif /* AVCODEC_INTRAX8_H */