apps/plugins/mpegplayer/mpeg_stream.h

   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 */