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/*
* standalone sound mixer based on rxi's cmixer.
*/
enum {
FIXED_BITS = 12,
FIXED_UNIT = 1<<FIXED_BITS,
FIXED_MASK = FIXED_UNIT-1,
MIXBUFSIZE = 512,
MIXBUFMASK = MIXBUFSIZE-1,
AUDIO_STATE_STOPPED = 0,
AUDIO_STATE_PLAYING,
AUDIO_STATE_PAUSED,
AUDIO_EVENT_DESTROY = 0,
AUDIO_EVENT_SAMPLES,
AUDIO_EVENT_REWIND
};
typedef struct Wav Wav;
typedef struct WavStream WavStream;
typedef struct Pcm Pcm;
typedef struct AudioEvent AudioEvent;
typedef struct AudioSourceInfo AudioSourceInfo;
typedef struct AudioSource AudioSource;
typedef struct Mixer Mixer;
struct Wav
{
void *data;
int bitdepth;
int samplerate;
int channels;
int length;
};
struct WavStream
{
Wav wav;
void *data;
int idx;
};
struct Pcm
{
void *data;
int len;
int off;
int depth;
int chans;
int rate;
};
struct AudioEvent
{
int type;
void *udata;
char *msg;
s16int *buffer;
int length;
};
struct AudioSourceInfo
{
void *udata;
int samplerate;
int length;
void (*handler)(AudioEvent *e); /* Event handler */
};
struct AudioSource
{
AudioSource *next; /* Next source in list */
s16int buffer[MIXBUFSIZE]; /* Internal buffer with raw stereo PCM */
void *udata; /* Stream's udata (from AudioSourceInfo) */
int samplerate; /* Stream's native samplerate */
int length; /* Stream's length in samples */
int end; /* End index for the current play-through */
int state; /* Current state (playing|paused|stopped) */
s64int position; /* Current playhead position (fixed point) */
int lgain, rgain; /* Left and right gain (fixed point) */
int rate; /* Playback rate (fixed point) */
int nextfill; /* Next frame idx where the buffer needs to be filled */
int loop; /* Whether the source will loop when `end` is reached */
int rewind; /* Whether the source will rewind before playing */
int active; /* Whether the source is part of `sources` list */
double gain; /* Gain set by `audio_set_gain()` */
double pan; /* Pan set by `audio_set_pan()` */
void (*handler)(AudioEvent *e); /* Event handler */
};
struct Mixer
{
char *lasterror; /* Last error message */
AudioSource *sources; /* Linked list of active (playing) sources */
s32int buffer[MIXBUFSIZE]; /* Internal master buffer */
int samplerate; /* Master samplerate */
int gain; /* Master gain (fixed point) */
};
void audio_init(int);
void audio_set_master_gain(double);
void audio_process(s16int*, int);
AudioSource *audio_new_source(AudioSourceInfo*);
AudioSource *audio_new_source_from_file(char*);
AudioSource *audio_new_source_from_mp3file(char*);
AudioSource *audio_new_source_from_mem(void*, int);
void audio_destroy_source(AudioSource*);
double audio_get_length(AudioSource*);
double audio_get_position(AudioSource*);
int audio_get_state(AudioSource*);
void audio_set_gain(AudioSource*, double);
void audio_set_pan(AudioSource*, double);
void audio_set_pitch(AudioSource*, double);
void audio_set_loop(AudioSource*, int);
void audio_play(AudioSource*);
void audio_pause(AudioSource*);
void audio_stop(AudioSource*);
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