Load a buffer with data - Справочник: PHP5.4

bool openal_buffer_data ( resource $buffer , int $format , string $data , int $freq )

buffer: An Open AL(Buffer) resource (previously created by openal_buffer_create()).
format: Format of data, one of: AL_FORMAT_MONO8, AL_FORMAT_MONO16, AL_FORMAT_STEREO8 и AL_FORMAT_STEREO16
data: Block of binary audio data in the format and freq specified.
freq: Frequency of data given in Hz.

Возвращает TRUE в случае успешного завершения или FALSE в случае возникновения ошибки.