/*

   Copyright (C) 2003 Commonwealth Scientific and Industrial Research

   Organisation (CSIRO) Australia

   Redistribution and use in source and binary forms, with or without

   modification, are permitted provided that the following conditions

   are met:

   - Redistributions of source code must retain the above copyright

   notice, this list of conditions and the following disclaimer.

   - Redistributions in binary form must reproduce the above copyright

   notice, this list of conditions and the following disclaimer in the

   documentation and/or other materials provided with the distribution.

   - Neither the name of CSIRO Australia nor the names of its

   contributors may be used to endorse or promote products derived from

   this software without specific prior written permission.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A

   PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE ORGANISATION OR

   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

#include "config.h"

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <fcntl.h>

#include <getopt.h>

#include <errno.h>

#ifdef HAVE_INTTYPES_H

#  include <inttypes.h>

#else

#  define PRId64 "I64d"

#endif

#include "oggz/oggz.h"

#include "oggz_tools.h"

#define READ_SIZE 4096

#define ALL_VORBIS_WARNING \

  "oggz-merge: WARNING: Merging Ogg Vorbis I files. The resulting file will\n" \

  "  contain %d tracks in parallel, interleaved for simultaneous playback.\n"\

  "  If you want to sequence these files one after another, use cat instead.\n"

static char * progname;

static void

usage (char * progname)

{

  printf ("Usage: %s [options] filename ...\n", progname);

  printf ("Merge Ogg files together, interleaving pages in order of presentation time.\n");

  printf ("\nMiscellaneous options\n");

  printf ("  -o filename, --output filename\n");

  printf ("                         Specify output filename\n");

  printf ("  -h, --help             Display this help and exit\n");

  printf ("  -v, --version          Output version information and exit\n");

  printf ("  -V, --verbose          Verbose operation\n");

  printf ("\n");

  printf ("Please report bugs to <ogg-dev@xiph.org>\n");

}

static void

exit_out_of_memory (void)

{

  fprintf (stderr, "%s: Out of memory\n", progname);

  exit (1);

}

static void

checked_fwrite (const void *data, size_t size, size_t count, FILE *stream)

{

  int n = fwrite (data, size, count, stream);

  if ((size_t)n != count) {

    perror ("write failed");

    exit (1);

  }

}

typedef struct _OMData OMData;

typedef struct _OMInput OMInput;

typedef struct _OMITrack OMITrack;

struct _OMData {

  OggzTable * inputs;

  int verbose;

};

struct _OMInput {

  OMData * omdata;

  OGGZ * reader;

  const ogg_page * og;

};

struct _OMITrack {

  long output_serialno;

};

static ogg_page *

_ogg_page_copy (const ogg_page * og)

{

  ogg_page * new_og;

  new_og = malloc (sizeof (*og));

  if (new_og == NULL) return NULL;

  new_og->header = malloc (og->header_len);

  if (new_og->header == NULL) {

    free (new_og);

    return NULL;

  }

  new_og->header_len = og->header_len;

  memcpy (new_og->header, og->header, og->header_len);

  new_og->body = malloc (og->body_len);

  if (new_og->body == NULL) {

    free (new_og->header);

    free (new_og);

    return NULL;

  }

  new_og->body_len = og->body_len;

  memcpy (new_og->body, og->body, og->body_len);

  return new_og;

}

static int

_ogg_page_free (const ogg_page * og)

{

  free (og->header);

  free (og->body);

  free ((ogg_page *)og);

  return 0;

}

static void

ominput_delete (OMInput * input)

{

  oggz_close (input->reader);

  free (input);

}

static OMData *

omdata_new (void)

{

  OMData * omdata;

  omdata = (OMData *) malloc (sizeof (OMData));

  if (omdata == NULL) return NULL;

  omdata->inputs = oggz_table_new ();

  omdata->verbose = 0;

  return omdata;

}

static void

omdata_delete (OMData * omdata)

{

  OMInput * input;

  int i, ninputs;

  ninputs = oggz_table_size (omdata->inputs);

  for (i = 0; i < ninputs; i++) {

    input = (OMInput *) oggz_table_nth (omdata->inputs, i, NULL);

    ominput_delete (input);

  }

  oggz_table_delete (omdata->inputs);

  free (omdata);

}

static int

read_page (OGGZ * oggz, const ogg_page * og, long serialno, void * user_data)

{

  OMInput * input = (OMInput *) user_data;

  input->og = _ogg_page_copy (og);

  if (input->og == NULL) return OGGZ_STOP_ERR;

  return OGGZ_STOP_OK;

}

static int

omdata_add_input (OMData * omdata, FILE * infile)

{

  OMInput * input;

  int nfiles;

  input = (OMInput *) malloc (sizeof (OMInput));

  if (input == NULL) return -1;

  input->omdata = omdata;

  input->reader = oggz_open_stdio (infile, OGGZ_READ|OGGZ_AUTO);

  input->og = NULL;

  oggz_set_read_page (input->reader, -1, read_page, input);

  nfiles = oggz_table_size (omdata->inputs);

  if (!oggz_table_insert (omdata->inputs, nfiles++, input)) {

    ominput_delete (input);

    return -1;

  }

  return 0;

}

static int

oggz_merge (OMData * omdata, FILE * outfile)

{

  OMInput * input;

  int ninputs, i, min_i;

  long key, n;

  ogg_int64_t units, min_units;

  const ogg_page * og;

  int active;

  /* For theora+vorbis, or dirac+vorbis, ensure video bos is first */

  int careful_for_video = 0;

  /* If all input files are Ogg Vorbis I, warn that the output will not be

   * a valid Ogg Vorbis I file as it will be multitrack. This is in response

   * to Debian bug 280550: http://bugs.debian.org/280550

   */

  int v, warn_all_vorbis = 1;

  if (oggz_table_size (omdata->inputs) == 2)

    careful_for_video = 1;

  while ((ninputs = oggz_table_size (omdata->inputs)) > 0) {

    min_units = -1;

    min_i = -1;

    active = 1;

    if (omdata->verbose)

      printf ("------------------------------------------------------------\n");

    /* Reload all pages, and find the min (earliest) */

    for (i = 0; active && i < oggz_table_size (omdata->inputs); i++) {

      input = (OMInput *) oggz_table_nth (omdata->inputs, i, &key);

      if (input != NULL) {

	while (input && input->og == NULL) {

	  n = oggz_read (input->reader, READ_SIZE);

	  if (n == 0) {

	    oggz_table_remove (omdata->inputs, key);

	    ominput_delete (input);

	    input = NULL;

	  } else if (n == OGGZ_ERR_STOP_ERR) {

            exit_out_of_memory();

          }

	}

	if (input && input->og) {

	  if (ogg_page_bos ((ogg_page *)input->og)) {

	    min_i = i;

	    if (careful_for_video || warn_all_vorbis) {

              int is_vorbis;

              long serialno = ogg_page_serialno ((ogg_page *)input->og);

              is_vorbis = (oggz_stream_get_content (input->reader, serialno) == OGGZ_CONTENT_VORBIS);

	      if (i == 0 && is_vorbis)

		careful_for_video = 0;

	      else

		active = 0;

              if (!is_vorbis) warn_all_vorbis = 0;

	    } else {

	      active = 0;

	    }

	  } else if (warn_all_vorbis) {

            int all_inputs_are_beyond_bos = 1;

            /* All BOS pages seen so far are Ogg Vorbis. The following loop

             * checks if all input files are single-track, ie. Ogg Vorbis I.

             * We can only rely on this information if all inputs are beyond

             * bos, ie. all BOS pages have been seen. */

            for (v = 0; v < oggz_table_size (omdata->inputs); v++) {

              OMInput * input_v;

              OGGZ * oggz;

              input_v = (OMInput *) oggz_table_nth (omdata->inputs, i, &key);

              oggz = input_v->reader;

              if (oggz_get_bos(oggz, -1)) all_inputs_are_beyond_bos = 0;

              else if (oggz_get_numtracks(oggz) > 1) warn_all_vorbis = 0;

            }

            if (all_inputs_are_beyond_bos && warn_all_vorbis) {

              fprintf (stderr, ALL_VORBIS_WARNING, v);

              warn_all_vorbis = 0;

            }

          }

	  units = oggz_tell_units (input->reader);

	  if (omdata->verbose) {

	    ot_fprint_time (stdout, (double)units/1000);

	    printf (": Got index %d serialno %010u %" PRId64 " units: ",

		    i, ogg_page_serialno ((ogg_page *)input->og), units);

	  }

	  if (min_units == -1 || units == 0 ||

	      (units > -1 && units < min_units)) {

	    min_units = units;

	    min_i = i;

	    if (omdata->verbose)

	      printf ("Min\n");

	  } else {

	    if (omdata->verbose)

	      printf ("Moo\n");

	  }

	} else if (omdata->verbose) {

	  if (input == NULL) {

	    printf ("*** index %d NULL\n", i);

	  } else {

	    printf ("*** No page from index %d\n", i);

	  }

	}

      }

    }

    if (omdata->verbose)

      printf ("Min index %d\n", min_i);

    /* Write the earliest page */

    if (min_i != -1) {

      input = (OMInput *) oggz_table_nth (omdata->inputs, min_i, &key);

      og = input->og;

      checked_fwrite (og->header, 1, og->header_len, outfile);

      checked_fwrite (og->body, 1, og->body_len, outfile);

      _ogg_page_free (og);

      input->og = NULL;

    }

  }

  return 0;

}

int

main (int argc, char * argv[])

{

  int show_version = 0;

  int show_help = 0;

  char * infilename = NULL, * outfilename = NULL;

  FILE * infile = NULL, * outfile = NULL;

  int used_stdin = 0; /* Flag usage of stdin, only use it once */

  OMData * omdata;

  int i;

  char * optstring = "hvVo:";

#ifdef HAVE_GETOPT_LONG

  static struct option long_options[] = {

    {"help", no_argument, 0, 'h'},

    {"version", no_argument, 0, 'v'},

    {"verbose", no_argument, 0, 'V'},

    {"output", required_argument, 0, 'o'},

    {0,0,0,0}

  };

#endif

  ot_init ();

  progname = argv[0];

  if (argc < 2) {

    usage (progname);

    return (1);

  }

  if (!strncmp (argv[1], "-?", 2)) {

#ifdef HAVE_GETOPT_LONG

    ot_print_options (long_options, optstring);

#else

    ot_print_short_options (optstring);

#endif

    exit (0);

  }

  omdata = omdata_new();

  if (omdata == NULL)

    exit_out_of_memory();

  while (1) {

#ifdef HAVE_GETOPT_LONG

    i = getopt_long (argc, argv, optstring, long_options, NULL);

#else

    i = getopt (argc, argv, optstring);

#endif

    if (i == -1) break;

    if (i == ':') {

      usage (progname);

      goto exit_err;

    }

    switch (i) {

    case 'h': /* help */

      show_help = 1;

      break;

    case 'v': /* version */

      show_version = 1;

      break;

    case 'o': /* output */

      outfilename = optarg;

      break;

    case 'V': /* verbose */

      omdata->verbose = 1;

    default:

      break;

    }

  }

  if (show_version) {

    printf ("%s version " VERSION "\n", progname);

  }

  if (show_help) {

    usage (progname);

  }

  if (show_version || show_help) {

    goto exit_ok;

  }

  if (optind >= argc) {

    usage (progname);

    goto exit_err;

  }

  if (optind >= argc) {

    usage (progname);

    goto exit_err;

  }

  while (optind < argc) {

    infilename = argv[optind++];

    if (strcmp (infilename, "-") == 0) {

      if (used_stdin) continue;

      infile = stdin;

      used_stdin = 1;

    } else {

      infile = fopen (infilename, "rb");

    }

    if (infile == NULL) {

      fprintf (stderr, "%s: unable to open input file %s\n", progname,

	       infilename);

    } else {

      if (omdata_add_input (omdata, infile) < 0)

        exit_out_of_memory();

    }

  }

  if (outfilename == NULL) {

    outfile = stdout;

  } else {

    outfile = fopen (outfilename, "wb");

    if (outfile == NULL) {

      fprintf (stderr, "%s: unable to open output file %s\n",

	       progname, outfilename);

      goto exit_err;

    }

  }

  oggz_merge (omdata, outfile);

 exit_ok:

  omdata_delete (omdata);

  exit (0);

 exit_err:

  omdata_delete (omdata);

  exit (1);

}