/*
 * Copyright (c) 1994 Michael Simmons.
 * All rights reserved.
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose, without fee, and without written agreement is
 * hereby granted, provided that the above copyright notice and the following
 * two paragraphs appear in all copies of this software.
 *
 * IN NO EVENT SHALL MICHAEL SIMMONS BE LIABLE TO ANY PARTY FOR
 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
 * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF MICHAEL SIMMONS
 * HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * THE MICHAEL SIMMONS SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
 * ON AN "AS IS" BASIS, AND MICHAEL SIMMONS HAS NO OBLIGATION TO
 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
 *
 * I can be contacted via
 * Email: michael@ecel.uwa.edu.au
 * Post: P.O. Box 506, NEDLANDS WA 6009, AUSTRALIA
 *
 * Amigaversion by Tobias Seiler in 1997
 * Email: tabs@blader.com
 */

/* MPEG Stream Constants */

/* Start codes. */

#define PICTURE_START_CODE       0x00000100
#define SLICE_MIN_START_CODE     0x00000101
#define SLICE_MAX_START_CODE     0x000001af
#define RESERVED_START_CODE_1    0x000001b0
#define RESERVED_START_CODE_2    0x000001b1
#define USER_START_CODE          0x000001b2
#define SEQ_START_CODE           0x000001b3
#define EXT_START_CODE           0x000001b5
#define RESERVED_START_CODE_3    0x000001b6
#define SEQ_END_CODE             0x000001b7
#define GOP_START_CODE           0x000001b8
#define ISO_11172_END_CODE       0x000001b9
#define PACK_START_CODE          0x000001ba
#define SYSTEM_HEADER_START_CODE 0x000001bb
#define RESERVED_STREAM          0x000001bc
#define PRIVATE_STREAM_1         0x000001bd
#define PADDING_STREAM           0x000001be
#define PRIVATE_STREAM_2         0x000001bf
#define AUDIO_STREAM_0           0x000001c0
#define AUDIO_STREAM_31          0x000001df
#define VIDIO_STREAM_0           0x000001e0
#define VIDIO_STREAM_15          0x000001ef
#define RESERVED_DATA_STREAM_0   0x000001f0
#define RESERVED_DATA_STREAM_15  0x000001ff

/* other stuff */
#define MAX_NUM_STREAMS  43

/* Picture_coding_type */

#define I_TYPE  1
#define P_TYPE  2
#define B_TYPE  3
#define D_TYPE  4

/* Macros used with macroblock address decoding. */

#define MB_STUFFING  34
#define MB_ESCAPE    35

/* Special values for DCT Coefficients */
#define END_OF_BLOCK  62
#define ESCAPE        61

/* Audio */

#define AUDIO_HEADER_SYNC  0xfff

#define LAYER_I        3
#define LAYER_II       2
#define LAYER_III      1
#define LAYER_RESERVED 0

#define SAMPLE_FREQ_44  0
#define SAMPLE_FREQ_48  1
#define SAMPLE_FREQ_32  2
#define SAMPLE_FREQ_RESERVED 3

#define MODE_STEREO         0
#define MODE_JOINT_STEREO   1
#define MODE_DUAL_CHANNEL   2
#define MODE_SINGLE_CHANNEL 3

#define EMPHASIS_NONE       0
#define EMPHASIS_50_15      1
#define EMPHASIS_RESERVED   2
#define EMPHASIS_CCITTJ17   3

typedef struct {
  FILE   *stream;
  unsigned int STD_scale;  /*  1 bit  */
  unsigned int STD_size;  /* 13 bits */
  unsigned int PTS_hibit;  /*  1 bit  */
  unsigned int PTS;   /* 32 bits */
  unsigned int DTS_hibit;  /*  1 bit  */
  unsigned int DTS;   /* 32 bits */
}
StreamInfo;

typedef struct {
  unsigned int SCR_hibit;  /*  1 bit  */
  unsigned int SCR;   /* 32 bits */
  unsigned int mux_rate;  /* 22 bits */
}
Pack_Header;

typedef struct {
  unsigned int header_length; /* 16 bits  */
  unsigned int rate_bound;  /* 22 bits  */
  unsigned int audio_bound; /*  6 bits  */
  unsigned int fixed_flag;  /*  1 bit   */
  unsigned int CSPS_flag;  /*  1 bit   */
  unsigned int audio_lock_flag;/*  1 bit   */
  unsigned int video_lock_flag;/*  1 bit   */
  unsigned int video_bound; /*  5 bits  */
  unsigned int reserved_byte; /*  8 bits  */
  unsigned int STD_flag[MAX_NUM_STREAMS];
  unsigned int STD_scale_bound[MAX_NUM_STREAMS];
  unsigned int STD_size_bound[MAX_NUM_STREAMS];
}
System_Header;

typedef struct {
  unsigned int stream_id;  /*  8 bits  */
  unsigned int packet_length; /* 16 bits  */
  unsigned int STD_flag;  /*  1 bit   */
  unsigned int STD_scale;  /*  1 bit   */
  unsigned int STD_size;  /* 13 bits  */
  unsigned int PTS_Flag;  /*  1 bit   */
  unsigned int PTS_hibit;  /*  1 bit   */
  unsigned int PTS;   /* 32 bits  */
  unsigned int DTS_Flag;  /*  1 bit */
  unsigned int DTS_hibit;  /*  1 bit   */
  unsigned int DTS;   /* 32 bits  */
  unsigned int buffer_size;
  char   *buffer;
}
Packet;