2 * This file is part of Libav.
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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.
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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"
24 #include "intrax8dsp.h"
26 typedef struct IntraX8Context {
27 VLC *j_ac_vlc[4]; // they point to the static j_mb_vlc
33 // set by ff_intrax8_common_init
34 uint8_t *prediction_table; // 2 * (mb_w * 2)
35 ScanTable scantable[3];
37 // set by the caller codec
39 IntraX8DSPContext dsp;
44 // calculated per frame
46 int divide_quant_dc_luma;
47 int divide_quant_dc_chroma;
60 * Initialize IntraX8 frame decoder.
61 * Requires valid MpegEncContext with valid s->mb_width before calling.
62 * @param w pointer to IntraX8Context
63 * @param s pointer to MpegEncContext of the parent codec
64 * @return 0 on success, a negative AVERROR value on error
66 int ff_intrax8_common_init(IntraX8Context *w, MpegEncContext *const s);
69 * Destroy IntraX8 frame structure.
70 * @param w pointer to IntraX8Context
72 void ff_intrax8_common_end(IntraX8Context *w);
75 * Decode single IntraX8 frame.
76 * The parent codec must fill s->loopfilter and s->gb (bitstream).
77 * The parent codec must call ff_mpv_frame_start() before calling this function.
78 * The parent codec must call ff_mpv_frame_end() after calling this function.
79 * This function does not use ff_mpv_decode_mb().
80 * @param w pointer to IntraX8Context
81 * @param dquant doubled quantizer, it would be odd in case of VC-1 halfpq==1.
82 * @param quant_offset offset away from zero
84 int ff_intrax8_decode_picture(IntraX8Context *w, int quant, int halfpq);
86 #endif /* AVCODEC_INTRAX8_H */