SDL::AudioSpec -- SDL Bindings for structure SDL::AudioSpec
Core, Audio, Structure
use SDL; use SDL::AudioSpec; SDL::init(SDL_INIT_AUDIO); my $audio_spec = SDL::AudioSpec->new(); $audio_spec->freq(22050); # 22050Hz - FM Radio quality $audio_spec->format(AUDIO_S16SYS); # 16-bit signed audio $audio_spec->samples(8192); # Large audio buffer reduces risk of dropouts but increases response time $audio_spec->channels(1); # Mono
The SDL::AudioSpec
structure is used to describe the format of some audio data. This structure is used by SDL::Audio::open_audio
and SDL::Audio::load_wav
.
While all fields are used by SDL::Audio::open_audio
, only freq
, format
, samples
and channels
are used by SDL::Audio::load_wav
.
We will detail these common members here.
The number of samples sent to the sound device every second. Common values are 11025, 22050 and 44100. The higher the better.
Specifies the size and type of each sample element. Values it can take are:
Unsigned 8-bit samples.
Signed 8-bit samples.
not supported by all hardware (unsigned 16-bit little-endian)
not supported by all hardware (signed 16-bit little-endian)
not supported by all hardware (unsigned 16-bit big-endian)
not supported by all hardware (signed 16-bit big-endian)
Either AUDIO_U16LSB or AUDIO_U16MSB depending on hardware CPU endianness
Either AUDIO_S16LSB or AUDIO_S16MSB depending on hardware CPU endianness
The number of separate sound channels. 1 is mono (single channel), 2 is stereo (dual channel).
When used with SDL::Audio::open_audio
this refers to the size of the audio buffer in samples. A sample is a chunk of audio data of the
size specified in format multiplied by the number of channels. When the SDL::AudioSpec
is used with SDL::Audio::load_wav
samples is
set to 4096.