1/*
2 * MPEGVideo decoders header
3 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
4 * Copyright (c) 2002-2004 Michael Niedermayer
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23/**
24 * @file
25 * mpegvideo decoder header.
26 */
27
28#ifndef AVCODEC_MPEGVIDEODEC_H
29#define AVCODEC_MPEGVIDEODEC_H
30
31#include "libavutil/frame.h"
32#include "libavutil/log.h"
33
34#include "avcodec.h"
35#include "get_bits.h"
36#include "mpegpicture.h"
37#include "mpegvideo.h"
38#include "mpegvideodata.h"
39
40#define FF_MPV_QSCALE_TYPE_MPEG1 0
41#define FF_MPV_QSCALE_TYPE_MPEG2 1
42
43/**
44 * Initialize the given MpegEncContext for decoding.
45 * the changed fields will not depend upon
46 * the prior state of the MpegEncContext.
47 */
48void ff_mpv_decode_init(MpegEncContext *s, AVCodecContext *avctx);
49
50int ff_mpv_common_frame_size_change(MpegEncContext *s);
51
52int ff_mpv_frame_start(MpegEncContext *s, AVCodecContext *avctx);
53void ff_mpv_report_decode_progress(MpegEncContext *s);
54void ff_mpv_frame_end(MpegEncContext *s);
55
56int ff_mpv_export_qp_table(MpegEncContext *s, AVFrame *f, Picture *p, int qp_type);
57int ff_mpeg_update_thread_context(AVCodecContext *dst, const AVCodecContext *src);
58void ff_mpeg_draw_horiz_band(MpegEncContext *s, int y, int h);
59void ff_mpeg_flush(AVCodecContext *avctx);
60
61void ff_print_debug_info(MpegEncContext *s, Picture *p, AVFrame *pict);
62
63static inline int mpeg_get_qscale(MpegEncContext *s)
64{
65    int qscale = get_bits(&s->gb, 5);
66    if (s->q_scale_type)
67        return ff_mpeg2_non_linear_qscale[qscale];
68    else
69        return qscale << 1;
70}
71
72static inline int check_marker(void *logctx, GetBitContext *s, const char *msg)
73{
74    int bit = get_bits1(s);
75    if (!bit)
76        av_log(logctx, AV_LOG_INFO, "Marker bit missing at %d of %d %s\n",
77               get_bits_count(s) - 1, s->size_in_bits, msg);
78
79    return bit;
80}
81
82#endif /* AVCODEC_MPEGVIDEODEC_H */
83