linux/drivers/isdn/mISDN/dsp.h

/*
 * Audio support data for ISDN4Linux.
 *
 * Copyright 2002/2003 by Andreas Eversberg ([email protected])
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 */

#define DEBUG_DSP_CTRL …
#define DEBUG_DSP_CORE …
#define DEBUG_DSP_DTMF …
#define DEBUG_DSP_CMX …
#define DEBUG_DSP_TONE …
#define DEBUG_DSP_BLOWFISH …
#define DEBUG_DSP_DELAY …
#define DEBUG_DSP_CLOCK …
#define DEBUG_DSP_DTMFCOEFF …

/* options may be:
 *
 * bit 0 = use ulaw instead of alaw
 * bit 1 = enable hfc hardware acceleration for all channels
 *
 */
#define DSP_OPT_ULAW …
#define DSP_OPT_NOHARDWARE …

#include <linux/timer.h>
#include <linux/workqueue.h>

#include "dsp_ecdis.h"

extern int dsp_options;
extern int dsp_debug;
extern int dsp_poll;
extern int dsp_tics;
extern spinlock_t dsp_lock;
extern struct work_struct dsp_workq;
extern u32 dsp_poll_diff; /* calculated fix-comma corrected poll value */

/***************
 * audio stuff *
 ***************/

extern s32 dsp_audio_alaw_to_s32[256];
extern s32 dsp_audio_ulaw_to_s32[256];
extern s32 *dsp_audio_law_to_s32;
extern u8 dsp_audio_s16_to_law[65536];
extern u8 dsp_audio_alaw_to_ulaw[256];
extern u8 dsp_audio_mix_law[65536];
extern u8 dsp_audio_seven2law[128];
extern u8 dsp_audio_law2seven[256];
extern void dsp_audio_generate_law_tables(void);
extern void dsp_audio_generate_s2law_table(void);
extern void dsp_audio_generate_seven(void);
extern void dsp_audio_generate_mix_table(void);
extern void dsp_audio_generate_ulaw_samples(void);
extern void dsp_audio_generate_volume_changes(void);
extern u8 dsp_silence;


/*************
 * cmx stuff *
 *************/

#define MAX_POLL …

#define CMX_BUFF_SIZE …
#define CMX_BUFF_HALF …
#define CMX_BUFF_MASK …

/* how many seconds will we check the lowest delay until the jitter buffer
   is reduced by that delay */
#define MAX_SECONDS_JITTER_CHECK …

extern struct timer_list dsp_spl_tl;

/* the datatype need to match jiffies datatype */
extern unsigned long dsp_spl_jiffies;

/* the structure of conferences:
 *
 * each conference has a unique number, given by user space.
 * the conferences are linked in a chain.
 * each conference has members linked in a chain.
 * each dsplayer points to a member, each member points to a dsplayer.
 */

/* all members within a conference (this is linked 1:1 with the dsp) */
struct dsp;
struct dsp_conf_member { … };

/* the list of all conferences */
struct dsp_conf { … };


/**************
 * DTMF stuff *
 **************/

#define DSP_DTMF_NPOINTS …

#define ECHOCAN_BUFF_SIZE …
#define ECHOCAN_BUFF_MASK …

struct dsp_dtmf { … };


/******************
 * pipeline stuff *
 ******************/
struct dsp_pipeline { … };

/***************
 * tones stuff *
 ***************/

struct dsp_tone { … };

/***************
 * echo stuff *
 ***************/

struct dsp_echo { … };

/*****************
 * general stuff *
 *****************/

struct dsp { … };

/* functions */

extern void dsp_change_volume(struct sk_buff *skb, int volume);

extern struct list_head dsp_ilist;
extern struct list_head conf_ilist;
extern void dsp_cmx_debug(struct dsp *dsp);
extern void dsp_cmx_hardware(struct dsp_conf *conf, struct dsp *dsp);
extern int dsp_cmx_conf(struct dsp *dsp, u32 conf_id);
extern void dsp_cmx_receive(struct dsp *dsp, struct sk_buff *skb);
extern void dsp_cmx_hdlc(struct dsp *dsp, struct sk_buff *skb);
extern void dsp_cmx_send(struct timer_list *arg);
extern void dsp_cmx_transmit(struct dsp *dsp, struct sk_buff *skb);
extern int dsp_cmx_del_conf_member(struct dsp *dsp);
extern int dsp_cmx_del_conf(struct dsp_conf *conf);

extern void dsp_dtmf_goertzel_init(struct dsp *dsp);
extern void dsp_dtmf_hardware(struct dsp *dsp);
extern u8 *dsp_dtmf_goertzel_decode(struct dsp *dsp, u8 *data, int len,
				    int fmt);

extern int dsp_tone(struct dsp *dsp, int tone);
extern void dsp_tone_copy(struct dsp *dsp, u8 *data, int len);
extern void dsp_tone_timeout(struct timer_list *t);

extern void dsp_bf_encrypt(struct dsp *dsp, u8 *data, int len);
extern void dsp_bf_decrypt(struct dsp *dsp, u8 *data, int len);
extern int dsp_bf_init(struct dsp *dsp, const u8 *key, unsigned int keylen);
extern void dsp_bf_cleanup(struct dsp *dsp);

extern int  dsp_pipeline_module_init(void);
extern void dsp_pipeline_module_exit(void);
extern int  dsp_pipeline_init(struct dsp_pipeline *pipeline);
extern void dsp_pipeline_destroy(struct dsp_pipeline *pipeline);
extern int  dsp_pipeline_build(struct dsp_pipeline *pipeline, const char *cfg);
extern void dsp_pipeline_process_tx(struct dsp_pipeline *pipeline, u8 *data,
				    int len);
extern void dsp_pipeline_process_rx(struct dsp_pipeline *pipeline, u8 *data,
				    int len, unsigned int txlen);