FFmpeg
mpegvideodec.h
Go to the documentation of this file.
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  */
49 
51 
55 
56 int ff_mpv_export_qp_table(const MpegEncContext *s, AVFrame *f, const Picture *p, int qp_type);
58 void ff_mpeg_draw_horiz_band(MpegEncContext *s, int y, int h);
59 void ff_mpeg_flush(AVCodecContext *avctx);
60 
61 void ff_print_debug_info(const MpegEncContext *s, const Picture *p, AVFrame *pict);
62 
63 static 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 
72 static 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 */
ff_mpv_frame_start
int ff_mpv_frame_start(MpegEncContext *s, AVCodecContext *avctx)
generic function called after decoding the header and before a frame is decoded.
Definition: mpegvideo_dec.c:263
ff_mpeg_update_thread_context
int ff_mpeg_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
Definition: mpegvideo_dec.c:51
get_bits_count
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:219
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:325
ff_mpeg2_non_linear_qscale
const uint8_t ff_mpeg2_non_linear_qscale[32]
Definition: mpegvideodata.c:26
mpegvideo.h
Picture
Picture.
Definition: mpegpicture.h:46
ff_mpv_report_decode_progress
void ff_mpv_report_decode_progress(MpegEncContext *s)
Definition: mpegvideo_dec.c:561
ff_print_debug_info
void ff_print_debug_info(const MpegEncContext *s, const Picture *p, AVFrame *pict)
Definition: mpegvideo_dec.c:487
bit
#define bit(string, value)
Definition: cbs_mpeg2.c:58
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
GetBitContext
Definition: get_bits.h:61
ff_mpv_decode_init
void ff_mpv_decode_init(MpegEncContext *s, AVCodecContext *avctx)
Initialize the given MpegEncContext for decoding.
Definition: mpegvideo_dec.c:37
s
#define s(width, name)
Definition: cbs_vp9.c:256
ff_mpeg_draw_horiz_band
void ff_mpeg_draw_horiz_band(MpegEncContext *s, int y, int h)
Definition: mpegvideo_dec.c:524
get_bits.h
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
check_marker
static int check_marker(void *logctx, GetBitContext *s, const char *msg)
Definition: mpegvideodec.h:72
f
f
Definition: af_crystalizer.c:122
frame.h
ff_mpv_export_qp_table
int ff_mpv_export_qp_table(const MpegEncContext *s, AVFrame *f, const Picture *p, int qp_type)
Definition: mpegvideo_dec.c:494
mpegpicture.h
mpegvideodata.h
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:191
log.h
avcodec.h
ff_mpv_common_frame_size_change
int ff_mpv_common_frame_size_change(MpegEncContext *s)
Definition: mpegvideo_dec.c:187
AVCodecContext
main external API structure.
Definition: avcodec.h:398
mpeg_get_qscale
static int mpeg_get_qscale(MpegEncContext *s)
Definition: mpegvideodec.h:63
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
h
h
Definition: vp9dsp_template.c:2038
MpegEncContext
MpegEncContext.
Definition: mpegvideo.h:62
ff_mpeg_flush
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo_dec.c:532
ff_mpv_frame_end
void ff_mpv_frame_end(MpegEncContext *s)
Definition: mpegvideo_dec.c:479