128d8c7c15
The inline function audio_format_sample_size() calculates how many bytes each sample consumes. This function already takes into account that 24 bit samples are 4 bytes long, not 3.
74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
/* the Music Player Daemon (MPD)
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* Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
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* This project's homepage is: http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef AUDIO_FORMAT_H
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#define AUDIO_FORMAT_H
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#include "mpd_types.h"
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struct audio_format {
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mpd_uint32 sampleRate;
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mpd_sint8 bits;
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mpd_sint8 channels;
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};
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static inline void audio_format_clear(struct audio_format *af)
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{
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af->sampleRate = 0;
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af->bits = 0;
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af->channels = 0;
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}
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static inline int audio_format_defined(const struct audio_format *af)
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{
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return af->sampleRate != 0;
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}
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static inline int audio_format_equals(const struct audio_format *a,
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const struct audio_format *b)
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{
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return a->sampleRate == b->sampleRate &&
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a->bits == b->bits &&
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a->channels == b->channels;
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}
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/**
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* Returns the size of each (mono) sample in bytes.
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*/
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static inline unsigned audio_format_sample_size(const struct audio_format *af)
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{
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if (af->bits <= 8)
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return 1;
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else if (af->bits <= 16)
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return 2;
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else
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return 4;
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}
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static inline double audio_format_time_to_size(const struct audio_format *af)
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{
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return af->sampleRate * af->channels * audio_format_sample_size(af);
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}
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static inline double audioFormatSizeToTime(const struct audio_format *af)
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{
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return 1.0 / audio_format_time_to_size(af);
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}
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#endif
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