/*
 * mp3plot - Bitrate analysis tool
 *
 * Copyright (C) 2007 Toni Corvera
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

// $Id: mp3_bitrate_dist.cc 745 2007-05-23 23:51:24Z  $

#include <cassert>

#include "mp3_bitrate_dist.h"
#include "mp3_frame.h"

namespace net_outlyer {

namespace mp3 {

bitrate_distribution::bitrate_distribution()
    : max(0),
      is_filled(false)
{
    for (int i=0; i<BITRATE_TABLE_LEN; ++i) {
        table[ BITRATE_TABLE[i] ] = 0;
    }
}

void bitrate_distribution::fill_from(const frame_vector_t & frames, bool is_vbr) {
    assert( ! is_filled );
    assert( 0 == max );

    frame_vector_constit_t it = frames.begin();

    // The first frame *on VBR files* doesn't contain audio.
    // It just contains meta info.
    if (is_vbr) {
        ++it;
    }
    for ( ; it != frames.end(); ++it) {
        table[it->bitrate]++;
        if (max < table[it->bitrate]) { max=table[it->bitrate]; }
    }

    is_filled = true;
}

bitrate_table_constit_t bitrate_distribution::begin() const {
     assert( is_filled );

     // bitrate_table_t is sorted, the invalid value is < 0, so it will be
     // at the start, jump over it
     bitrate_table_constit_t it = table.begin();

     // Let's self-protect from future changes...
     assert( it->first == BAD_BITRATE );
     it++;
     assert( it->first >= 0 );

     return it;
}

numframes_t bitrate_distribution::bad_frames() const {
    assert( is_filled );

    bitrate_table_constit_t it = table.begin();
    // As in begin(), BAD_BITRATE should be at the start and have a negative key
    assert( it->first == BAD_BITRATE );

    return it->second;
}

} // namespace mp3

} // namespace net_outlyer

/* vim:set ts=4 et ai: */