edl.c

   1 /*
   2  * This file is part of MPlayer.
   3  *
   4  * MPlayer is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * MPlayer is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include "config.h"
  22 #include "mp_msg.h"
  23 #include "edl.h"
  24 #include "help_mp.h"
  25
  26 char *edl_filename; // file to extract EDL entries from (-edl)
  27 char *edl_output_filename; // file to put EDL entries in (-edlout)
  28
  29 /**
  30  *  Allocates a new EDL record and makes sure allocation was successful.
  31  *
  32  *  \return New allocated EDL record.
  33  *  \brief Allocate new EDL record
  34  */
  35
  36 static edl_record_ptr edl_alloc_new(edl_record_ptr next_edl_record)
  37 {
  38     edl_record_ptr new_record = calloc(1, sizeof(struct edl_record));
  39     if (!new_record) {
  40         mp_tmsg(MSGT_CPLAYER, MSGL_FATAL, "Can't allocate enough memory to hold EDL data.\n");
  41         exit(1);
  42     }
  43
  44     if (next_edl_record) // if this isn't the first record, tell the previous one what the new one is.
  45         next_edl_record->next = new_record;
  46     new_record->prev = next_edl_record;
  47     new_record->next = NULL;
  48
  49     return new_record;
  50 }
  51
  52 /**
  53  *  Goes through entire EDL records and frees all memory.
  54  *  Assumes next_edl_record is valid or NULL.
  55  *
  56  *  \brief Free EDL memory
  57  */
  58
  59 void free_edl(edl_record_ptr next_edl_record)
  60 {
  61     edl_record_ptr tmp;
  62     while (next_edl_record) {
  63         tmp = next_edl_record->next;
  64         free(next_edl_record);
  65         next_edl_record = tmp;
  66     }
  67 }
  68
  69 /** Parses edl_filename to fill EDL operations queue.
  70  * Prints out how many EDL operations recorded total.
  71  *  \brief Fills EDL operations queue.
  72  */
  73
  74 edl_record_ptr edl_parse_file(void)
  75 {
  76     FILE *fd;
  77     char line[100];
  78     float start, stop;
  79     int action;
  80     int record_count = 0;
  81     int lineCount = 0;
  82     edl_record_ptr edl_records = NULL;
  83     edl_record_ptr next_edl_record = NULL;
  84
  85     if (edl_filename)
  86     {
  87         if ((fd = fopen(edl_filename, "r")) == NULL)
  88         {
  89             return NULL;
  90         }
  91
  92         while (fgets(line, 99, fd) != NULL)
  93         {
  94             lineCount++;
  95
  96             if ((sscanf(line, "%f %f %d", &start, &stop, &action))
  97                 != 3)
  98             {
  99                 mp_tmsg(MSGT_CPLAYER, MSGL_WARN, "Badly formatted EDL line [%d], discarding.\n",
 100                        lineCount);
 101                 continue;
 102             }
 103
 104             if (next_edl_record && start <= next_edl_record->stop_sec)
 105             {
 106                 mp_tmsg(MSGT_CPLAYER, MSGL_WARN, "Invalid EDL line: %s\n", line);
 107                 mp_tmsg(MSGT_CPLAYER, MSGL_WARN,
 108                                         "Last stop position was [%f]; next start is [%f].\n"\
 109                                         "Entries must be in chronological order, cannot overlap. Discarding.\n",
 110                        next_edl_record->stop_sec, start);
 111                 continue;
 112             }
 113
 114             if (stop <= start)
 115             {
 116                 mp_tmsg(MSGT_CPLAYER, MSGL_WARN, "Invalid EDL line: %s\n",
 117                        line);
 118                 mp_tmsg(MSGT_CPLAYER, MSGL_WARN, "Stop time has to be after start time.\n");
 119                 continue;
 120             }
 121
 122             next_edl_record = edl_alloc_new(next_edl_record);
 123
 124             if (!edl_records) edl_records = next_edl_record;
 125
 126             next_edl_record->action = action;
 127
 128             if (action == EDL_MUTE)
 129             {
 130                 next_edl_record->length_sec = 0;
 131                 next_edl_record->start_sec = start;
 132                 next_edl_record->stop_sec = start;
 133
 134                 next_edl_record = edl_alloc_new(next_edl_record);
 135
 136                 next_edl_record->action = action;
 137                 next_edl_record->length_sec = 0;
 138                 next_edl_record->start_sec = stop;
 139                 next_edl_record->stop_sec = stop;
 140             } else
 141             {
 142                 next_edl_record->length_sec = stop - start;
 143                 next_edl_record->start_sec = start;
 144                 next_edl_record->stop_sec = stop;
 145             }
 146
 147             record_count++;
 148         }
 149
 150         fclose(fd);
 151     }
 152
 153     if (edl_records)
 154         mp_tmsg(MSGT_CPLAYER, MSGL_INFO, "Read %d EDL actions.\n", record_count);
 155     else
 156         mp_tmsg(MSGT_CPLAYER, MSGL_INFO, "There are no EDL actions to take care of.\n");
 157
 158     return edl_records;
 159 }