/*
 * Datastructures for working with H.222 Program Stream packets - in
 * particular, for reading PES packets.
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is the MPEG TS, PS and ES tools.
 *
 * The Initial Developer of the Original Code is Amino Communications Ltd.
 * Portions created by the Initial Developer are Copyright (C) 2008
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Amino Communications Ltd, Swavesey, Cambridge UK
 *
 * ***** END LICENSE BLOCK *****
 */

#ifndef _ps_defns
#define _ps_defns

#include "compat.h"
#include "h222_defns.h"
#include "tswrite_defns.h"

// ------------------------------------------------------------
// A program stream context, used to read PS and manage a read-ahead cache

#define PS_READ_AHEAD_SIZE  5000  // The number of bytes to read ahead

struct ps_reader
{
  int       input;             // where we're reading from
  offset_t  start;             // the offset at which our data starts

  byte      data[PS_READ_AHEAD_SIZE];
  offset_t  data_posn;         // location of this data in the file
  int32_t   data_len;          // actual number of bytes in the buffer
  byte     *data_end;          // off the end of `data`
  byte     *data_ptr;          // which byte we're interested in (next)
};
typedef struct ps_reader *PS_reader_p;
#define SIZEOF_PS_READER sizeof(struct ps_reader)

// ------------------------------------------------------------
// A program stream pack header (not including the system header packets)
struct PS_pack_header
{
  int       id;            // A number to identify this packet
  byte      data[10];      // The data excluding the leading 00 00 01 BA
  uint64_t  scr;           // Formed from scr_base and scr_ext
  uint64_t  scr_base;
  uint32_t  scr_extn;
  uint32_t  program_mux_rate;
  int       pack_stuffing_length;
};
typedef struct PS_pack_header *PS_pack_header_p;
#define SIZEOF_PS_PACK_HEADER sizeof(struct PS_pack_header)

// ------------------------------------------------------------
// A program stream packet (specifically one that starts with six bytes
// organised as 00 00 01 <stream id> <packet length>)
struct PS_packet
{
  int       id;            // A number to identify this packet

  byte     *data;          // The data including the leading 00 00 01
  int       data_len;      // Its length

  byte      stream_id;     // Its stream id (i.e., data[4])
  int       packet_length; // The packet length (6 less than data_len)
};
typedef struct PS_packet *PS_packet_p;
#define SIZEOF_PS_PACKET sizeof(struct PS_packet)

// ------------------------------------------------------------
// Number of streams of various types

#define NUMBER_VIDEO_STREAMS    0x0F
#define NUMBER_AUDIO_STREAMS    0x1F
#define NUMBER_AC3_SUBSTREAMS   0x08

// DVD private_stream_1 substream identifiers
// (also used for non-DVD data when we have identified the private data
// appropriately)
#define SUBSTREAM_OTHER         0
#define SUBSTREAM_AC3           1       // AC-3 audio (Dolby 5.1)
#define SUBSTREAM_DTS           2       // DTS  audio
#define SUBSTREAM_LPCM          3       // LPCM audio (CD audio)
#define SUBSTREAM_SUBPICTURES   4       // Sub-pictures
#define SUBSTREAM_ERROR         5       // Error in deciding
#define NUMBER_SUBSTREAM_TYPES  6       // useful for array sizing

#define SUBSTREAM_STR(what)     ((what)==SUBSTREAM_OTHER?"other": \
                                 (what)==SUBSTREAM_AC3  ?"AC3":   \
                                 (what)==SUBSTREAM_DTS  ?"DTS":   \
                                 (what)==SUBSTREAM_LPCM ?"LPCM":  \
                                 (what)==SUBSTREAM_SUBPICTURES?"subpictures": \
                                 "???")

#define SUBSTREAM_IS_AUDIO(what)  ((what)==SUBSTREAM_AC3|| \
                                   (what)==SUBSTREAM_DTS|| \
                                   (what)==SUBSTREAM_LPCM)

#define BSMOD_STR(bsmod,acmod) \
  ((bsmod)==0?"main audio service: complete main (CM)": \
   (bsmod)==1?"main audio service: music & effects (ME)": \
   (bsmod)==2?"associated service: visually impaired (VI)": \
   (bsmod)==3?"associated service: hearing impaired (HI)": \
   (bsmod)==4?"associated service: dialogue (D)": \
   (bsmod)==5?"associated service: commentary (C)": \
   (bsmod)==6?"associated service: emergency (E)": \
   (bsmod)==7 && (acmod)==1?"associated service: voice over (VO)": \
   (bsmod)==7 && (acmod)>=2 && (acmod)<=7?"main audio service: karaoke": \
   "???")

#define ACMOD_STR(acmod) ((acmod)==0?"1+1 Ch1,Ch2": \
                          (acmod)==1?"1/0 C": \
                          (acmod)==2?"2/0 L,R": \
                          (acmod)==3?"3/0 L,C,R": \
                          (acmod)==4?"2/1 L,R,S": \
                          (acmod)==5?"3/1 L,C,R,S": \
                          (acmod)==6?"2/2 L,R,SL,SR": \
                          (acmod)==7?"3/2 L,C,R,SL,SR":"???")

#endif // _ps_defns

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