mfcc_comp.h File Reference

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Data Structures
struct	mfcc_data_header
	Data header prepended to every MFCC output frame. More...
struct	mfcc_buffer
struct	mfcc_pre_emph
struct	mfcc_fft
struct	mfcc_cepstral_lifter
struct	mfcc_state
struct	mfcc_comp_data

Macros
#define	MFCC_GENERIC
#define	MFCC_MAGIC   0x6d666363 /* ASCII for "mfcc" */
#define	MFCC_FFT_BITS   32
#define	MFCC_MAX_SAMPLE_RATE   64000 /* Max sample rate in Hz, limited by int16_t Mel scale */
#define	MFCC_CTRL_INDEX_VAD   0
	Switch control index for VAD notification to user space.

Typedefs
typedef void(*	mfcc_source_func) (struct sof_source *source, struct mfcc_buffer *buf, struct mfcc_pre_emph *emph, int frames, int source_channel)
	Type definition for source/sink based input copy function.

Functions
static int	mfcc_buffer_samples_without_wrap (struct mfcc_buffer *buffer, int16_t *ptr)
static int16_t *	mfcc_buffer_wrap (struct mfcc_buffer *buffer, int16_t *ptr)
int	mfcc_setup (struct processing_module *mod, int max_frames, int rate, int channels)
void	mfcc_free_buffers (struct processing_module *mod)
void	mfcc_fill_prev_samples (struct mfcc_buffer *buf, int16_t *prev_data, int prev_data_length)
void	mfcc_fill_fft_buffer (struct mfcc_state *state)
void	mfcc_apply_window (struct mfcc_state *state, int input_shift)
int	mfcc_stft_process (struct processing_module *mod, struct mfcc_comp_data *cd)
	Run STFT and Mel/DCT processing.
int	mfcc_process_output (struct processing_module *mod, struct mfcc_comp_data *cd, struct sof_source **sources, struct sof_sink **sinks, int num_ceps, int frames)
	Prepare and commit MFCC output data after STFT processing.
void	mfcc_source_copy_s16 (struct sof_source *source, struct mfcc_buffer *buf, struct mfcc_pre_emph *emph, int frames, int source_channel)
void	mfcc_source_copy_s32 (struct sof_source *source, struct mfcc_buffer *buf, struct mfcc_pre_emph *emph, int frames, int source_channel)
static int	mfcc_ipc_notification_init (struct processing_module *mod)
static void	mfcc_send_vad_notification (struct processing_module *mod, uint32_t val)
static int	mfcc_get_config (struct processing_module *mod, uint32_t config_id, uint32_t *data_offset_size, uint8_t *fragment, size_t fragment_size)
static int	mfcc_set_config (struct processing_module *mod, uint32_t config_id, enum module_cfg_fragment_position pos, uint32_t data_offset_size, const uint8_t *fragment, size_t fragment_size, uint8_t *response, size_t response_size)

Macro Definition Documentation

MFCC_CTRL_INDEX_VAD

#define MFCC_CTRL_INDEX_VAD   0

Switch control index for VAD notification to user space.

MFCC_FFT_BITS

#define MFCC_FFT_BITS   32

MFCC_GENERIC

#define MFCC_GENERIC

MFCC_MAGIC

#define MFCC_MAGIC   0x6d666363 /* ASCII for "mfcc" */

MFCC_MAX_SAMPLE_RATE

#define MFCC_MAX_SAMPLE_RATE   64000 /* Max sample rate in Hz, limited by int16_t Mel scale */

Typedef Documentation

mfcc_source_func

typedef void(* mfcc_source_func) (struct sof_source *source, struct mfcc_buffer *buf, struct mfcc_pre_emph *emph, int frames, int source_channel)

Type definition for source/sink based input copy function.

Function Documentation

mfcc_apply_window()

void mfcc_apply_window	(	struct mfcc_state *	state,
		int	input_shift )

mfcc_buffer_samples_without_wrap()

int mfcc_buffer_samples_without_wrap ( struct mfcc_buffer * buffer, int16_t * ptr )

inlinestatic

mfcc_buffer_wrap()

int16_t * mfcc_buffer_wrap ( struct mfcc_buffer * buffer, int16_t * ptr )

inlinestatic

mfcc_fill_fft_buffer()

void mfcc_fill_fft_buffer

(

struct mfcc_state *

state

)

mfcc_fill_prev_samples()

void mfcc_fill_prev_samples	(	struct mfcc_buffer *	buf,
		int16_t *	prev_data,
		int	prev_data_length )

mfcc_free_buffers()

void mfcc_free_buffers

(

struct processing_module *

mod

)

mfcc_get_config()

int mfcc_get_config ( struct processing_module * mod, uint32_t config_id, uint32_t * data_offset_size, uint8_t * fragment, size_t fragment_size )

inlinestatic

mfcc_ipc_notification_init()

int mfcc_ipc_notification_init ( struct processing_module * mod )

inlinestatic

mfcc_process_output()

int mfcc_process_output	(	struct processing_module *	mod,
		struct mfcc_comp_data *	cd,
		struct sof_source **	sources,
		struct sof_sink **	sinks,
		int	num_ceps,
		int	frames )

Prepare and commit MFCC output data after STFT processing.

This handles the output data conversion and dispatches to either the compress-output or legacy PCM-output path.

Returns

0 on success or a negative error code.

mfcc_send_vad_notification()

void mfcc_send_vad_notification ( struct processing_module * mod, uint32_t val )

inlinestatic

mfcc_set_config()

int mfcc_set_config ( struct processing_module * mod, uint32_t config_id, enum module_cfg_fragment_position pos, uint32_t data_offset_size, const uint8_t * fragment, size_t fragment_size, uint8_t * response, size_t response_size )

inlinestatic

mfcc_setup()

int mfcc_setup	(	struct processing_module *	mod,
		int	max_frames,
		int	rate,
		int	channels )

mfcc_source_copy_s16()

void mfcc_source_copy_s16	(	struct sof_source *	source,
		struct mfcc_buffer *	buf,
		struct mfcc_pre_emph *	emph,
		int	frames,
		int	source_channel )

mfcc_source_copy_s32()

void mfcc_source_copy_s32	(	struct sof_source *	source,
		struct mfcc_buffer *	buf,
		struct mfcc_pre_emph *	emph,
		int	frames,
		int	source_channel )

mfcc_stft_process()

int mfcc_stft_process	(	struct processing_module *	mod,
		struct mfcc_comp_data *	cd )

Run STFT and Mel/DCT processing.

Returns

Number of output coefficients produced, or 0 if not enough data.