@ -19,6 +19,7 @@
# include <stdint.h>
# include <math.h>
# include <system/audio.h>
namespace android {
@ -37,68 +38,16 @@ namespace android {
// an int32_t of the phase increments, making the resulting sample rate inexact.
# define AUDIO_RESAMPLER_UP_RATIO_MAX 65536
// AUDIO_TIMESTRETCH_SPEED_MIN and AUDIO_TIMESTRETCH_SPEED_MAX define the min and max time stretch
// speeds supported by the system. These are enforced by the system and values outside this range
// will result in a runtime error.
// Depending on the AudioPlaybackRate::mStretchMode, the effective limits might be narrower than
// the ones specified here
// AUDIO_TIMESTRETCH_SPEED_MIN_DELTA is the minimum absolute speed difference that might trigger a
// parameter update
# define AUDIO_TIMESTRETCH_SPEED_MIN 0.01f
# define AUDIO_TIMESTRETCH_SPEED_MAX 20.0f
# define AUDIO_TIMESTRETCH_SPEED_NORMAL 1.0f
# define AUDIO_TIMESTRETCH_SPEED_MIN_DELTA 0.0001f
// AUDIO_TIMESTRETCH_PITCH_MIN and AUDIO_TIMESTRETCH_PITCH_MAX define the min and max time stretch
// pitch shifting supported by the system. These are not enforced by the system and values
// outside this range might result in a pitch different than the one requested.
// Depending on the AudioPlaybackRate::mStretchMode, the effective limits might be narrower than
// the ones specified here.
// AUDIO_TIMESTRETCH_PITCH_MIN_DELTA is the minimum absolute pitch difference that might trigger a
// parameter update
# define AUDIO_TIMESTRETCH_PITCH_MIN 0.25f
# define AUDIO_TIMESTRETCH_PITCH_MAX 4.0f
# define AUDIO_TIMESTRETCH_PITCH_NORMAL 1.0f
# define AUDIO_TIMESTRETCH_PITCH_MIN_DELTA 0.0001f
//Determines the current algorithm used for stretching
enum AudioTimestretchStretchMode : int32_t {
AUDIO_TIMESTRETCH_STRETCH_DEFAULT = 0 ,
AUDIO_TIMESTRETCH_STRETCH_SPEECH = 1 ,
//TODO: add more stretch modes/algorithms
} ;
//Limits for AUDIO_TIMESTRETCH_STRETCH_SPEECH mode
# define TIMESTRETCH_SONIC_SPEED_MIN 0.1f
# define TIMESTRETCH_SONIC_SPEED_MAX 6.0f
using AudioTimestretchStretchMode = : : audio_timestretch_stretch_mode_t ;
//Determines behavior of Timestretch if current algorithm can't perform
//with current parameters.
// FALLBACK_CUT_REPEAT: (internal only) for speed <1.0 will truncate frames
// for speed > 1.0 will repeat frames
// FALLBACK_MUTE: will set all processed frames to zero
// FALLBACK_FAIL: will stop program execution and log a fatal error
enum AudioTimestretchFallbackMode : int32_t {
AUDIO_TIMESTRETCH_FALLBACK_CUT_REPEAT = - 1 ,
AUDIO_TIMESTRETCH_FALLBACK_DEFAULT = 0 ,
AUDIO_TIMESTRETCH_FALLBACK_MUTE = 1 ,
AUDIO_TIMESTRETCH_FALLBACK_FAIL = 2 ,
} ;
struct AudioPlaybackRate {
float mSpeed ;
float mPitch ;
enum AudioTimestretchStretchMode mStretchMode ;
enum AudioTimestretchFallbackMode mFallbackMode ;
} ;
static const AudioPlaybackRate AUDIO_PLAYBACK_RATE_DEFAULT = {
AUDIO_TIMESTRETCH_SPEED_NORMAL ,
AUDIO_TIMESTRETCH_PITCH_NORMAL ,
AUDIO_TIMESTRETCH_STRETCH_DEFAULT ,
AUDIO_TIMESTRETCH_FALLBACK_DEFAULT
} ;
using AudioTimestretchFallbackMode = : : audio_timestretch_fallback_mode_t ;
using AudioPlaybackRate = : : audio_playback_rate_t ;
static const AudioPlaybackRate AUDIO_PLAYBACK_RATE_DEFAULT = : : AUDIO_PLAYBACK_RATE_INITIALIZER ;
static inline bool isAudioPlaybackRateEqual ( const AudioPlaybackRate & pr1 ,
const AudioPlaybackRate & pr2 ) {
Mikhail Naganov
4 years ago