2 * This file is part of Libav.
4 * Libav 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 * Libav 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 Libav; 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"
25 #include "intrax8dsp.h"
26 #include "mpegpicture.h"
28 typedef struct IntraX8Context {
29 VLC *j_ac_vlc[4]; // they point to the static j_mb_vlc
35 // set by ff_intrax8_common_init
36 uint8_t *prediction_table; // 2 * (mb_w * 2)
37 ScanTable scantable[3];
39 // set by the caller codec
41 IntraX8DSPContext dsp;
50 // calculated per frame
52 int divide_quant_dc_luma;
53 int divide_quant_dc_chroma;
55 uint8_t scratchpad[42]; // size of the block is fixed (8x8 plus padding)
68 * Initialize IntraX8 frame decoder.
69 * Requires valid MpegEncContext with valid s->mb_width before calling.
70 * @param w pointer to IntraX8Context
71 * @param idsp pointer to IDCTDSPContext
72 * @param s pointer to MpegEncContext of the parent codec
73 * @return 0 on success, a negative AVERROR value on error
75 int ff_intrax8_common_init(IntraX8Context *w, IDCTDSPContext *idsp,
76 MpegEncContext *const s);
79 * Destroy IntraX8 frame structure.
80 * @param w pointer to IntraX8Context
82 void ff_intrax8_common_end(IntraX8Context *w);
85 * Decode single IntraX8 frame.
86 * The parent codec must call ff_mpv_frame_start() before calling this function.
87 * The parent codec must call ff_mpv_frame_end() after calling this function.
88 * This function does not use ff_mpv_decode_mb().
89 * @param w pointer to IntraX8Context
90 * @param pict the output Picture containing an AVFrame
91 * @param gb open bitstream reader
92 * @param dquant doubled quantizer, it would be odd in case of VC-1 halfpq==1.
93 * @param quant_offset offset away from zero
94 * @param loopfilter enable filter after decoding a block
96 int ff_intrax8_decode_picture(IntraX8Context *w, Picture *pict,
98 int quant, int halfpq, int loopfilter);
100 #endif /* AVCODEC_INTRAX8_H */