122 lines
4.9 KiB
C
122 lines
4.9 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Stream definitions for MPEG
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*
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* Copyright (c) 2007 Michael Sevakis
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef MPEG_STREAM_H
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#define MPEG_STREAM_H
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/* Codes for various header byte sequences - MSB represents lowest memory
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address */
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#define PACKET_START_CODE_PREFIX 0x00000100ul
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#define END_CODE 0x000001b9ul
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#define PACK_START_CODE 0x000001baul
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#define SYSTEM_HEADER_START_CODE 0x000001bbul
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/* p = base pointer, b0 - b4 = byte offsets from p */
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/* We only care about the MS 32 bits of the 33 and so the ticks are 45kHz */
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#define TS_FROM_HEADER(p, b0) \
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((uint32_t)((((p)[(b0)+0] & 0x0e) << 28) | \
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(((p)[(b0)+1] ) << 21) | \
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(((p)[(b0)+2] & 0xfe) << 13) | \
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(((p)[(b0)+3] ) << 6) | \
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(((p)[(b0)+4] ) >> 2)))
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#define TS_CHECK_MARKERS(p, b0) \
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(((((p)[(b0)+0] & 0x01) << 2) | \
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(((p)[(b0)+2] & 0x01) << 1) | \
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(((p)[(b0)+4] & 0x01) )) == 0x07)
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/* Get the SCR in our 45kHz ticks. Ignore the 9-bit extension */
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#define MPEG2_PACK_HEADER_SCR(p, b0) \
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((uint32_t)((((p)[(b0)+0] & 0x38) << 26) | \
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(((p)[(b0)+0] & 0x03) << 27) | \
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(((p)[(b0)+1] ) << 19) | \
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(((p)[(b0)+2] & 0xf8) << 11) | \
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(((p)[(b0)+2] & 0x03) << 12) | \
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(((p)[(b0)+3] ) << 4) | \
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(((p)[(b0)+4] ) >> 4)))
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#define MPEG2_CHECK_PACK_SCR_MARKERS(ph, b0) \
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(((((ph)[(b0)+0] & 0x04) ) | \
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(((ph)[(b0)+2] & 0x04) >> 1) | \
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(((ph)[(b0)+4] & 0x04) >> 2)) == 0x07)
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#define INVALID_TIMESTAMP (~(uint32_t)0)
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#define MAX_TIMESTAMP (INVALID_TIMESTAMP-1)
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#define TS_SECOND (45000) /* Timestamp ticks per second */
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#define TC_SECOND (27000000) /* MPEG timecode ticks per second */
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/* These values immediately follow the start code prefix '00 00 01' */
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/* Video start codes */
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#define MPEG_START_PICTURE 0x00
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#define MPEG_START_SLICE_FIRST 0x01
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#define MPEG_START_SLICE_LAST 0xaf
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#define MPEG_START_RESERVED_1 0xb0
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#define MPEG_START_RESERVED_2 0xb1
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#define MPEG_START_USER_DATA 0xb2
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#define MPEG_START_SEQUENCE_HEADER 0xb3
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#define MPEG_START_SEQUENCE_ERROR 0xb4
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#define MPEG_START_EXTENSION 0xb5
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#define MPEG_START_RESERVED_3 0xb6
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#define MPEG_START_SEQUENCE_END 0xb7
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#define MPEG_START_GOP 0xb8
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/* Stream IDs */
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#define MPEG_STREAM_PROGRAM_END 0xb9
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#define MPEG_STREAM_PACK_HEADER 0xba
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#define MPEG_STREAM_SYSTEM_HEADER 0xbb
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#define MPEG_STREAM_PROGRAM_STREAM_MAP 0xbc
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#define MPEG_STREAM_PRIVATE_1 0xbd
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#define MPEG_STREAM_PADDING 0xbe
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#define MPEG_STREAM_PRIVATE_2 0xbf
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#define MPEG_STREAM_AUDIO_FIRST 0xc0
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#define MPEG_STREAM_AUDIO_LAST 0xcf
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#define MPEG_STREAM_VIDEO_FIRST 0xe0
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#define MPEG_STREAM_VIDEO_LAST 0xef
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#define MPEG_STREAM_ECM 0xf0
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#define MPEG_STREAM_EMM 0xf1
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/* ITU-T Rec. H.222.0 | ISO/IEC 13818-1 Annex A or
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* ISO/IEC 13818-6_DSMCC_stream */
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#define MPEG_STREAM_MISC_1 0xf2
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/* ISO/IEC_13522_stream */
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#define MPEG_STREAM_MISC_2 0xf3
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/* ITU-T Rec. H.222.1 type A - E */
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#define MPEG_STREAM_MISC_3 0xf4
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#define MPEG_STREAM_MISC_4 0xf5
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#define MPEG_STREAM_MISC_5 0xf6
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#define MPEG_STREAM_MISC_6 0xf7
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#define MPEG_STREAM_MISC_7 0xf8
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#define MPEG_STREAM_ANCILLARY 0xf9
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#define MPEG_STREAM_RESERVED_FIRST 0xfa
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#define MPEG_STREAM_RESERVED_LAST 0xfe
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/* Program stream directory */
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#define MPEG_STREAM_PROGRAM_DIRECTORY 0xff
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#define STREAM_IS_AUDIO(s) (((s) & 0xf0) == 0xc0)
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#define STREAM_IS_VIDEO(s) (((s) & 0xf0) == 0xe0)
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#define MPEG_MAX_PACKET_SIZE (64*1024+16)
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/* Largest MPEG audio frame - MPEG1, Layer II, 384kbps, 32kHz, pad */
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#define MPA_MAX_FRAME_SIZE 1729
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#endif /* MPEG_STREAM_H */
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