comparison include/RTAudio.h @ 5:09f03ac40fcc

API improvements and cleanups. Now all common audio command-line options can be parsed automatically.

 #define CODEC_I2C_ADDRESS  0x18		// Address of TLV320AIC3104 codec
 #else
 #define CODEC_I2C_ADDRESS  0x1B		// Address of TLV320AIC3106 codec
 #endif
 
+// Default volume levels
+#define DEFAULT_DAC_LEVEL	0.0
+#define DEFAULT_ADC_LEVEL	-6.0
+#define DEFAULT_HP_LEVEL	-6.0
+
 enum {
 	kAmplifierMutePin = 61	// P8-26 controls amplifier mute
 };
+
+// Structure which contains initialisation parameters for the
+// real-time audio system
+typedef struct {
+	// These items might be adjusted by the user:
+	int periodSize;			// Number of (matrix) frames per period; audio is twice this
+	int beginMuted;			// Whether to begin with the speakers muted
+	float dacLevel;			// Level for the audio DAC output
+	float adcLevel;			// Level for the audio ADC input
+	float headphoneLevel;	// Level for the headphone output
+	int useMatrix;			// Whether to enable the ADC and DAC
+	int verbose;			// Whether to use verbose logging
+
+	// These items are hardware-dependent and should only be changed
+	// to run on different hardware
+	int codecI2CAddress;	// Where the codec can be found on the I2C bus
+	int ampMutePin;			// Pin where amplifier mute can be found
+} RTAudioSettings;
 
 typedef void* AuxiliaryTask;	// Opaque data type to keep track of aux tasks
 
 // Flag that indicates when the audio will stop; can be read or
 // set by other components which should end at the same time as the audio
 extern bool gShouldStop;
 
-int initAudio(int periodSize, int useMatrix, void *userData,
-			  int codecI2CAddress = CODEC_I2C_ADDRESS, int ampMutePin = kAmplifierMutePin);
-int startAudio();
-void stopAudio();
-void cleanupAudio();
+// Command-line settings
+void BeagleRT_defaultSettings(RTAudioSettings *settings);
+int BeagleRT_getopt_long(int argc, char *argv[], const char *customShortOptions,
+				   const struct option *customLongOptions, RTAudioSettings *settings);
+void BeagleRT_usage();
 
+// Basic audio control functions: init, start, stop and clean up
+int BeagleRT_initAudio(RTAudioSettings *settings, void *userData);
+int BeagleRT_startAudio();
+void BeagleRT_stopAudio();
+void BeagleRT_cleanupAudio();
+
+// Volume/level controls
+// These return 0 on success
+
+// Set the level of the DAC; affects all outputs (headphone, line, speaker)
+// 0dB is the maximum, -63.5dB is the minimum; 0.5dB steps
+int BeagleRT_setDACLevel(float decibels);
+
+// Set the level of the ADC
+// 0dB is the maximum, -12dB is the minimum; 1.5dB steps
+int BeagleRT_setADCLevel(float decibels);
+
+// Set the level of the onboard headphone amplifier; affects headphone
+// output only (not line out or speaker)
+// 0dB is the maximum, -63.5dB is the minimum; 0.5dB steps
+int BeagleRT_setHeadphoneLevel(float decibels);
+
+// Mute or unmute the onboard speaker amplifiers
+// mute == 0 means unmute; otherwise mute
+// Returns 0 on success
+int BeagleRT_muteSpeakers(int mute);
+
+// Functions for creating auxiliary tasks
 AuxiliaryTask createAuxiliaryTaskLoop(void (*functionToCall)(void), int priority, const char *name);
 void scheduleAuxiliaryTask(AuxiliaryTask task);
 
 void setVerboseLevel(int level);