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mpeg12.h
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1 /*
2  * MPEG1/2 common code
3  * Copyright (c) 2007 Aurelien Jacobs <aurel@gnuage.org>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #ifndef AVCODEC_MPEG12_H
23 #define AVCODEC_MPEG12_H
24 
25 #include "mpeg12vlc.h"
26 #include "mpegvideo.h"
27 
29 
31 
32 static inline int decode_dc(GetBitContext *gb, int component)
33 {
34  int code, diff;
35 
36  if (component == 0) {
37  code = get_vlc2(gb, ff_dc_lum_vlc.table, DC_VLC_BITS, 2);
38  } else {
40  }
41  if (code < 0){
42  av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
43  return 0xffff;
44  }
45  if (code == 0) {
46  diff = 0;
47  } else {
48  diff = get_xbits(gb, code);
49  }
50  return diff;
51 }
52 
54  const uint16_t *quant_matrix,
55  uint8_t *const scantable, int last_dc[3],
56  int16_t *block, int index, int qscale);
57 
59 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s);
60 
61 void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number);
62 void ff_mpeg1_encode_mb(MpegEncContext *s, int16_t block[8][64],
63  int motion_x, int motion_y);
66 
67 #endif /* AVCODEC_MPEG12_H */
#define NULL
Definition: coverity.c:32
int ff_mpeg1_decode_block_intra(GetBitContext *gb, const uint16_t *quant_matrix, uint8_t *const scantable, int last_dc[3], int16_t *block, int index, int qscale)
Definition: mpeg12.c:248
const char * s
Definition: avisynth_c.h:631
void ff_mpeg1_encode_init(MpegEncContext *s)
Definition: mpeg12enc.c:1002
VLC ff_dc_lum_vlc
Definition: mpeg12.c:137
MPEG1/2 VLC.
mpegvideo header.
void ff_mpeg1_encode_slice_header(MpegEncContext *s)
Definition: mpeg12enc.c:407
uint8_t ff_mpeg12_static_rl_table_store[2][2][2 *MAX_RUN+MAX_LEVEL+3]
Definition: mpeg12.c:45
uint8_t
void ff_mpeg12_common_init(MpegEncContext *s)
Definition: mpeg12.c:115
void ff_mpeg1_encode_mb(MpegEncContext *s, int16_t block[8][64], int motion_x, int motion_y)
Definition: mpeg12enc.c:993
#define MAX_LEVEL
Definition: rl.h:35
#define av_log(a,...)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
static int decode_dc(GetBitContext *gb, int component)
Definition: mpeg12.h:32
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:574
VLC ff_dc_chroma_vlc
Definition: mpeg12.c:138
static int get_xbits(GetBitContext *s, int n)
read mpeg1 dc style vlc (sign bit + mantissa with no MSB).
Definition: get_bits.h:231
void * buf
Definition: avisynth_c.h:553
int index
Definition: gxfenc.c:89
void ff_mpeg1_clean_buffers(MpegEncContext *s)
Definition: mpeg12.c:123
#define DC_VLC_BITS
Definition: intrax8.c:37
MpegEncContext.
Definition: mpegvideo.h:78
#define MAX_RUN
Definition: rl.h:34
void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
Definition: mpeg12enc.c:421
static av_always_inline int diff(const uint32_t a, const uint32_t b)
VLC_TYPE(* table)[2]
code, bits
Definition: get_bits.h:65
int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
Find the end of the current frame in the bitstream.
Definition: mpeg12.c:186
static int16_t block[64]
Definition: dct-test.c:112