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/*
* 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 "audio_format.h"
extern "C" {
#include "tag.h"
}
#include <assert.h>
music_chunk::~music_chunk()
{
if (tag != NULL)
tag_free(tag);
}
#ifndef NDEBUG
bool
music_chunk::CheckFormat(const struct audio_format &other_format) const
{
assert(audio_format_valid(&other_format));
return length == 0 ||
audio_format_equals(&audio_format, &other_format);
}
#endif
void *
music_chunk::Write(const struct audio_format &af,
float data_time, uint16_t _bit_rate,
size_t *max_length_r)
{
assert(CheckFormat(af));
assert(length == 0 || audio_format_valid(&audio_format));
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 = audio_format_frame_size(&af);
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 struct audio_format &af, size_t _length)
{
const size_t frame_size = audio_format_frame_size(&af);
assert(length + _length <= sizeof(data));
assert(audio_format_equals(&audio_format, &af));
length += _length;
return length + frame_size > sizeof(data);
}
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