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
23 #include "mpegvideo.h"
24 #include "intrax8dsp.h"
27 typedef struct IntraX8Context {
28 VLC *j_ac_vlc[4]; // they point to the static j_mb_vlc
34 // set by ff_intrax8_common_init
35 uint8_t *prediction_table; // 2 * (mb_w * 2)
36 ScanTable scantable[3];
38 uint8_t idct_permutation[64];
40 //set by the caller codec
42 IntraX8DSPContext dsp;
47 // calculated per frame
49 int divide_quant_dc_luma;
50 int divide_quant_dc_chroma;
63 * Initialize IntraX8 frame decoder.
64 * Requires valid MpegEncContext with valid s->mb_width before calling.
65 * @param w pointer to IntraX8Context
66 * @param s pointer to MpegEncContext of the parent codec
67 * @return 0 on success, a negative AVERROR value on error
69 int ff_intrax8_common_init(IntraX8Context *w, MpegEncContext *const s);
72 * Destroy IntraX8 frame structure.
73 * @param w pointer to IntraX8Context
75 void ff_intrax8_common_end(IntraX8Context *w);
78 * Decode single IntraX8 frame.
79 * The parent codec must fill s->loopfilter and s->gb (bitstream).
80 * The parent codec must call ff_mpv_frame_start() before calling this function.
81 * The parent codec must call ff_mpv_frame_end() after calling this function.
82 * This function does not use ff_mpv_decode_mb().
83 * lowres decoding is theoretically impossible.
84 * @param w pointer to IntraX8Context
85 * @param dquant doubled quantizer, it would be odd in case of VC-1 halfpq==1.
86 * @param quant_offset offset away from zero
88 int ff_intrax8_decode_picture(IntraX8Context *w, int quant, int halfpq);
90 #endif /* AVCODEC_INTRAX8_H */