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https://github.com/Pecusx/libretro-atari800.git
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R-type
102 lines
3.7 KiB
C
102 lines
3.7 KiB
C
#ifndef SOUND_H_
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#define SOUND_H_
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#include <stdio.h>
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#include "config.h"
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#include "atari.h"
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int Sound_Initialise(int *argc, char *argv[]);
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void Sound_Exit(void);
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void Sound_Update(void);
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void Sound_Pause(void);
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void Sound_Continue(void);
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#ifdef SUPPORTS_SOUND_REINIT
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void Sound_Reinit(void);
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#endif /* SUPPORTS_SOUND_REINIT */
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#ifdef SOUND_THIN_API
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/* Nomenclature used:
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Sample - a single portion of one channel of audio signal. Sample size equals
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1 byte for 8-bit audio and 2 bytes for 16-bit audio.
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Frame - a single portion of samples for all channels of audio signal. Frame
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size equals sample size * number of channels.
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The word "size", unless additionally specified, means size in bytes.
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*/
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typedef struct Sound_setup_t {
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/* Sound sample rate - number of frames per second: 1000..65535. */
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unsigned int freq;
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/* Number of bytes per each sample, also determines sample format:
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1 = unsigned 8-bit format.
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2 = signed 16-bit system-endian format. */
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int sample_size;
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/* Number of audio channels: 1 = mono, 2 = stereo. */
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unsigned int channels;
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/* Length of the hardware audio buffer in milliseconds. */
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unsigned int buffer_ms;
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/* Size of the hardware audio buffer in frames. Computed internally,
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equals freq * buffer_ms / 1000. */
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unsigned int buffer_frames;
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} Sound_setup_t;
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/* Holds parameters of the audio output desired by user. When calling Sound_Setup(),
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these parameters are used to open audio output. Audio output may get opened with
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different parameters than the desired ones (e.g. hardware might not support
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the desired parameters), so after opening, the actual parameters of the opened
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output are stored in Sound_out.
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Set Sound_desired.buffer_frames to 0 if you want the hardware to decide value of this
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parameter automatically.
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*/
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extern Sound_setup_t Sound_desired;
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/* Holds parameters of the currently-opened hardware audio output. Don't change
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it directly - use Sound_Setup instead. */
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extern Sound_setup_t Sound_out;
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/* Indicates whether sound output is enabled. Don't change it directly - use
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Sound_Setup to enable sound, and Sound_Exit to disable it. */
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extern int Sound_enabled;
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/* Enables hardware audio output with parameters based on those stored in
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Sound_desired. Stores the parameters of the actual opened output in
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Sound_out. The actual parameters may differ from the desired ones.
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The function can be called multiple times without calling Sound_Exit
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inbetween, e.g. to update params of an already-opened audio output.
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The function returns TRUE or FALSE to indicate if audio output
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has opened successfully, and also sets Sound_enabled to that value. */
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int Sound_Setup(void);
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#ifdef SOUND_CALLBACK
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/* Callback function to be called from platform-specific code. Fills audio
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buffer BUFFER with SIZE bytes of audio samples. */
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void Sound_Callback(UBYTE *buffer, unsigned int size);
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#endif /* SOUND_CALLBACK */
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/* Read/write to configuration file. */
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int Sound_ReadConfig(char *option, char *ptr);
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void Sound_WriteConfig(FILE *fp);
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#ifdef SYNCHRONIZED_SOUND
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/* Sound latency in ms. Don't change directly - use Sound_SetLatency instead. */
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extern unsigned int Sound_latency;
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void Sound_SetLatency(unsigned int latency);
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/* Returns a factor (1.0 by default) to adjust the speed of the emulation
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* so that if the sound buffer is too full or too empty. The emulation
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* slows down or speeds up to match the actual speed of sound output. */
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double Sound_AdjustSpeed(void);
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#endif /* SYNCHRONIZED_SOUND */
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/* Helper function for use when hardware audio buffer size is required to
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equal a power of 2. Returns a power of 2 that is not lower than NUM
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(0 <= NUM < UINT_MAX). */
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unsigned int Sound_NextPow2(unsigned int num);
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#endif /* SOUND_THIN_API */
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#endif /* SOUND_H_ */
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