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.
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 #ifndef AVCODEC_INTRAX8_H
20 #define AVCODEC_INTRAX8_H
24 #include "mpegvideo.h"
26 #include "intrax8dsp.h"
28 #include "mpegpicture.h"
30 typedef struct IntraX8Context {
31 VLC *j_ac_vlc[4]; // they point to the static j_mb_vlc
37 // set by ff_intrax8_common_init
38 uint8_t *prediction_table; // 2 * (mb_w * 2)
39 ScanTable scantable[3];
41 uint8_t idct_permutation[64];
42 AVCodecContext *avctx;
43 int *block_last_index; ///< last nonzero coefficient in block
46 //set by the caller codec
48 IntraX8DSPContext dsp;
58 // calculated per frame
60 int divide_quant_dc_luma;
61 int divide_quant_dc_chroma;
63 uint8_t scratchpad[42]; // size of the block is fixed (8x8 plus padding)
76 int mb_width, mb_height;
80 * Initialize IntraX8 frame decoder.
81 * Requires valid MpegEncContext with valid s->mb_width before calling.
82 * @param avctx pointer to AVCodecContext
83 * @param w pointer to IntraX8Context
84 * @param idsp pointer to IDCTDSPContext
85 * @param block pointer to block array
86 * @param block_last_index pointer to index array
87 * @param mb_width macroblock width
88 * @param mb_height macroblock height
89 * @param s pointer to MpegEncContext of the parent codec
90 * @return 0 on success, a negative AVERROR value on error
92 int ff_intrax8_common_init(AVCodecContext *avctx,
93 IntraX8Context *w, IDCTDSPContext *idsp,
95 int block_last_index[12],
96 int mb_width, int mb_height,
97 MpegEncContext *const s);
100 * Destroy IntraX8 frame structure.
101 * @param w pointer to IntraX8Context
103 void ff_intrax8_common_end(IntraX8Context *w);
106 * Decode single IntraX8 frame.
107 * The parent codec must call ff_mpv_frame_start() before calling this function.
108 * The parent codec must call ff_mpv_frame_end() after calling this function.
109 * This function does not use ff_mpv_decode_mb().
110 * lowres decoding is theoretically impossible.
111 * @param w pointer to IntraX8Context
112 * @param pict the output Picture containing an AVFrame
113 * @param gb open bitstream reader
114 * @param mb_x pointer to the x coordinate of the current macroblock
115 * @param mb_y pointer to the y coordinate of the current macroblock
116 * @param dquant doubled quantizer, it would be odd in case of VC-1 halfpq==1.
117 * @param quant_offset offset away from zero
118 * @param loopfilter enable filter after decoding a block
120 int ff_intrax8_decode_picture(IntraX8Context *w, Picture *pict,
121 GetBitContext *gb, int *mb_x, int *mb_y,
122 int quant, int halfpq,
123 int loopfilter, int lowdelay);
125 #endif /* AVCODEC_INTRAX8_H */