al_create_sample - Online Linux Manual PageSection : 3
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Source : Allegro reference manual
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NAMEal_create_sample − Allegro 5 API
SYNOPSIS
#include <allegro5/allegro_audio.h>
ALLEGRO_SAMPLE *al_create_sample(void *buf, unsigned int samples,
unsigned int freq, ALLEGRO_AUDIO_DEPTH depth,
ALLEGRO_CHANNEL_CONF chan_conf, bool free_buf)
DESCRIPTIONCreate a sample data structure from the supplied buffer. If free_buf is true then the buffer will be freed with al_free(3) when the sample data structure is destroyed. For portability (especially Windows), the buffer should have been allocated with al_malloc(3). Otherwise you should free the sample data yourself. A sample that is referred to by the samples parameter refers to a sequence channel intensities. E.g. if you're making a stereo sample with the samples set to 4, then the layout of the data in buf will be:
LRLRLRLR
Where L and R are the intensities for the left and right channels respectively. A single sample, then, refers to the LR pair in this example. To allocate a buffer of the correct size, you can use something like this:
int sample_size = al_get_channel_count(chan_conf)
* al_get_audio_depth_size(depth);
int bytes = samples * sample_size;
void *buffer = al_malloc(bytes);
SEE ALSOal_destroy_sample(3), ALLEGRO_AUDIO_DEPTH(3), ALLEGRO_CHANNEL_CONF(3) 0
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