aboutsummaryrefslogblamecommitdiffstats
path: root/src/MusicChunk.cxx
blob: 9ffe4f50913e27c9ae4b97ea4cb51869f131898d (plain) (tree)
1
2
3
4
5
6
7
8
9
10
11
12
13
  
                                                          










                                                                       



                                                                          

   
                   
                         
                          
                      
 

                   
                           
 
                   
 
 

              
                                                              
 
                                       
 
                                                           


      
      
                                        

                                                       
 
                                
                                                      
 
                          


                                                                    

                                     

         
                                                    
                                                                 


                            
              
                          

      
                                                
                             


    
                                                         
 
                                                    
 
                                                 
                                   
 
                          
 
                                                  
 
/*
 * Copyright (C) 2003-2013 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "config.h"
#include "MusicChunk.hxx"
#include "AudioFormat.hxx"
#include "tag/Tag.hxx"

#include <assert.h>

music_chunk::~music_chunk()
{
	delete tag;
}

#ifndef NDEBUG
bool
music_chunk::CheckFormat(const AudioFormat other_format) const
{
	assert(other_format.IsValid());

	return length == 0 || audio_format == other_format;
}
#endif

void *
music_chunk::Write(const AudioFormat af,
		   float data_time, uint16_t _bit_rate,
		   size_t *max_length_r)
{
	assert(CheckFormat(af));
	assert(length == 0 || audio_format.IsValid());

	if (length == 0) {
		/* if the chunk is empty, nobody has set bitRate and
		   times yet */

		bit_rate = _bit_rate;
		times = data_time;
	}

	const size_t frame_size = af.GetFrameSize();
	size_t num_frames = (sizeof(data) - length) / frame_size;
	if (num_frames == 0)
		return NULL;

#ifndef NDEBUG
	audio_format = af;
#endif

	*max_length_r = num_frames * frame_size;
	return data + length;
}

bool
music_chunk::Expand(const AudioFormat af, size_t _length)
{
	const size_t frame_size = af.GetFrameSize();

	assert(length + _length <= sizeof(data));
	assert(audio_format == af);

	length += _length;

	return length + frame_size > sizeof(data);
}