A modern Music Player Daemon based on Rockbox open source high quality audio player
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mpd
1/***************************************************************************
2 * __________ __ ___.
3 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
7 * \/ \/ \/ \/ \/
8 * $Id$
9 *
10 * Stream definitions for MPEG
11 *
12 * Copyright (c) 2007 Michael Sevakis
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version 2
17 * of the License, or (at your option) any later version.
18 *
19 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
20 * KIND, either express or implied.
21 *
22 ****************************************************************************/
23#ifndef MPEG_STREAM_H
24#define MPEG_STREAM_H
25
26/* Codes for various header byte sequences - MSB represents lowest memory
27 address */
28#define PACKET_START_CODE_PREFIX 0x00000100ul
29#define END_CODE 0x000001b9ul
30#define PACK_START_CODE 0x000001baul
31#define SYSTEM_HEADER_START_CODE 0x000001bbul
32
33/* p = base pointer, b0 - b4 = byte offsets from p */
34/* We only care about the MS 32 bits of the 33 and so the ticks are 45kHz */
35#define TS_FROM_HEADER(p, b0) \
36 ((uint32_t)((((p)[(b0)+0] & 0x0e) << 28) | \
37 (((p)[(b0)+1] ) << 21) | \
38 (((p)[(b0)+2] & 0xfe) << 13) | \
39 (((p)[(b0)+3] ) << 6) | \
40 (((p)[(b0)+4] ) >> 2)))
41
42#define TS_CHECK_MARKERS(p, b0) \
43 (((((p)[(b0)+0] & 0x01) << 2) | \
44 (((p)[(b0)+2] & 0x01) << 1) | \
45 (((p)[(b0)+4] & 0x01) )) == 0x07)
46
47/* Get the SCR in our 45kHz ticks. Ignore the 9-bit extension */
48#define MPEG2_PACK_HEADER_SCR(p, b0) \
49 ((uint32_t)((((p)[(b0)+0] & 0x38) << 26) | \
50 (((p)[(b0)+0] & 0x03) << 27) | \
51 (((p)[(b0)+1] ) << 19) | \
52 (((p)[(b0)+2] & 0xf8) << 11) | \
53 (((p)[(b0)+2] & 0x03) << 12) | \
54 (((p)[(b0)+3] ) << 4) | \
55 (((p)[(b0)+4] ) >> 4)))
56
57#define MPEG2_CHECK_PACK_SCR_MARKERS(ph, b0) \
58 (((((ph)[(b0)+0] & 0x04) ) | \
59 (((ph)[(b0)+2] & 0x04) >> 1) | \
60 (((ph)[(b0)+4] & 0x04) >> 2)) == 0x07)
61
62#define INVALID_TIMESTAMP (~(uint32_t)0)
63#define MAX_TIMESTAMP (INVALID_TIMESTAMP-1)
64#define TS_SECOND (45000) /* Timestamp ticks per second */
65#define TC_SECOND (27000000) /* MPEG timecode ticks per second */
66
67/* These values immediately follow the start code prefix '00 00 01' */
68
69/* Video start codes */
70#define MPEG_START_PICTURE 0x00
71#define MPEG_START_SLICE_FIRST 0x01
72#define MPEG_START_SLICE_LAST 0xaf
73#define MPEG_START_RESERVED_1 0xb0
74#define MPEG_START_RESERVED_2 0xb1
75#define MPEG_START_USER_DATA 0xb2
76#define MPEG_START_SEQUENCE_HEADER 0xb3
77#define MPEG_START_SEQUENCE_ERROR 0xb4
78#define MPEG_START_EXTENSION 0xb5
79#define MPEG_START_RESERVED_3 0xb6
80#define MPEG_START_SEQUENCE_END 0xb7
81#define MPEG_START_GOP 0xb8
82
83/* Stream IDs */
84#define MPEG_STREAM_PROGRAM_END 0xb9
85#define MPEG_STREAM_PACK_HEADER 0xba
86#define MPEG_STREAM_SYSTEM_HEADER 0xbb
87#define MPEG_STREAM_PROGRAM_STREAM_MAP 0xbc
88#define MPEG_STREAM_PRIVATE_1 0xbd
89#define MPEG_STREAM_PADDING 0xbe
90#define MPEG_STREAM_PRIVATE_2 0xbf
91#define MPEG_STREAM_AUDIO_FIRST 0xc0
92#define MPEG_STREAM_AUDIO_LAST 0xcf
93#define MPEG_STREAM_VIDEO_FIRST 0xe0
94#define MPEG_STREAM_VIDEO_LAST 0xef
95#define MPEG_STREAM_ECM 0xf0
96#define MPEG_STREAM_EMM 0xf1
97/* ITU-T Rec. H.222.0 | ISO/IEC 13818-1 Annex A or
98 * ISO/IEC 13818-6_DSMCC_stream */
99#define MPEG_STREAM_MISC_1 0xf2
100/* ISO/IEC_13522_stream */
101#define MPEG_STREAM_MISC_2 0xf3
102/* ITU-T Rec. H.222.1 type A - E */
103#define MPEG_STREAM_MISC_3 0xf4
104#define MPEG_STREAM_MISC_4 0xf5
105#define MPEG_STREAM_MISC_5 0xf6
106#define MPEG_STREAM_MISC_6 0xf7
107#define MPEG_STREAM_MISC_7 0xf8
108#define MPEG_STREAM_ANCILLARY 0xf9
109#define MPEG_STREAM_RESERVED_FIRST 0xfa
110#define MPEG_STREAM_RESERVED_LAST 0xfe
111/* Program stream directory */
112#define MPEG_STREAM_PROGRAM_DIRECTORY 0xff
113
114#define STREAM_IS_AUDIO(s) (((s) & 0xf0) == 0xc0)
115#define STREAM_IS_VIDEO(s) (((s) & 0xf0) == 0xe0)
116
117#define MPEG_MAX_PACKET_SIZE (64*1024+16)
118
119/* Largest MPEG audio frame - MPEG1, Layer II, 384kbps, 32kHz, pad */
120#define MPA_MAX_FRAME_SIZE 1729
121
122#endif /* MPEG_STREAM_H */