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audio_format: added audio_format_clear() and audio_format_defined()

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audio_format_clear() sets an audio_format struct to an cleared
(undefined) state, which is both faster and smaller than memset(0).
audio_format_defined() checks if the audio_format struct actually has
a defined value (i.e. non-zero).  Both can be used to avoid pointers
to audio_format, replacing the "NULL" value with an "undefined"
audio_format.
This commit is contained in:
Max Kellermann 2008-09-10 11:43:27 +02:00
parent 9ceadb0561
commit d92543698c
2 changed files with 13 additions and 1 deletions
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2
src/audio.c
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@ -231,7 +231,7 @@ static void syncAudioDeviceStates(void)
struct audio_output *audioOutput;
unsigned int i;
if (!audio_format.channels)
if (!audio_format_defined(&audio_format))
return;
for (i = 0; i < audioOutputArraySize; ++i) {

12
src/audio_format.h
View File

@ -27,6 +27,18 @@ struct audio_format {
mpd_sint8 channels;
};
static inline void audio_format_clear(struct audio_format *af)
{
af->sampleRate = 0;
af->bits = 0;
af->channels = 0;
}
static inline int audio_format_defined(const struct audio_format *af)
{
return af->sampleRate != 0;
}
static inline int audio_format_equals(const struct audio_format *a,
const struct audio_format *b)
{