bc138ec4ac
Audio recording requires software audio processing. Both hardware and software processing is simultaniously possible now. Signed-off-by: Andreas Eversberg <andreas@eversberg.eu> Signed-off-by: Karsten Keil <keil@b1-systems.de> Signed-off-by: David S. Miller <davem@davemloft.net>
276 lines
7.7 KiB
C
276 lines
7.7 KiB
C
/*
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* Audio support data for ISDN4Linux.
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*
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* Copyright 2002/2003 by Andreas Eversberg (jolly@eversberg.eu)
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*
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* This software may be used and distributed according to the terms
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* of the GNU General Public License, incorporated herein by reference.
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*
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*/
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#define DEBUG_DSP_CTRL 0x0001
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#define DEBUG_DSP_CORE 0x0002
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#define DEBUG_DSP_DTMF 0x0004
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#define DEBUG_DSP_CMX 0x0010
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#define DEBUG_DSP_TONE 0x0020
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#define DEBUG_DSP_BLOWFISH 0x0040
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#define DEBUG_DSP_DELAY 0x0100
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#define DEBUG_DSP_CLOCK 0x0200
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#define DEBUG_DSP_DTMFCOEFF 0x8000 /* heavy output */
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/* options may be:
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*
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* bit 0 = use ulaw instead of alaw
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* bit 1 = enable hfc hardware accelleration for all channels
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*
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*/
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#define DSP_OPT_ULAW (1<<0)
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#define DSP_OPT_NOHARDWARE (1<<1)
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#include <linux/timer.h>
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#include <linux/workqueue.h>
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#include "dsp_ecdis.h"
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extern int dsp_options;
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extern int dsp_debug;
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extern int dsp_poll;
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extern int dsp_tics;
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extern spinlock_t dsp_lock;
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extern struct work_struct dsp_workq;
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extern u32 dsp_poll_diff; /* calculated fix-comma corrected poll value */
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/***************
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* audio stuff *
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***************/
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extern s32 dsp_audio_alaw_to_s32[256];
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extern s32 dsp_audio_ulaw_to_s32[256];
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extern s32 *dsp_audio_law_to_s32;
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extern u8 dsp_audio_s16_to_law[65536];
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extern u8 dsp_audio_alaw_to_ulaw[256];
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extern u8 dsp_audio_mix_law[65536];
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extern u8 dsp_audio_seven2law[128];
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extern u8 dsp_audio_law2seven[256];
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extern void dsp_audio_generate_law_tables(void);
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extern void dsp_audio_generate_s2law_table(void);
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extern void dsp_audio_generate_seven(void);
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extern void dsp_audio_generate_mix_table(void);
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extern void dsp_audio_generate_ulaw_samples(void);
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extern void dsp_audio_generate_volume_changes(void);
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extern u8 dsp_silence;
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/*************
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* cmx stuff *
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*************/
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#define MAX_POLL 256 /* maximum number of send-chunks */
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#define CMX_BUFF_SIZE 0x8000 /* must be 2**n (0x1000 about 1/2 second) */
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#define CMX_BUFF_HALF 0x4000 /* CMX_BUFF_SIZE / 2 */
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#define CMX_BUFF_MASK 0x7fff /* CMX_BUFF_SIZE - 1 */
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/* how many seconds will we check the lowest delay until the jitter buffer
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is reduced by that delay */
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#define MAX_SECONDS_JITTER_CHECK 5
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extern struct timer_list dsp_spl_tl;
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extern u32 dsp_spl_jiffies;
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/* the structure of conferences:
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*
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* each conference has a unique number, given by user space.
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* the conferences are linked in a chain.
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* each conference has members linked in a chain.
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* each dsplayer points to a member, each member points to a dsplayer.
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*/
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/* all members within a conference (this is linked 1:1 with the dsp) */
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struct dsp;
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struct dsp_conf_member {
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struct list_head list;
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struct dsp *dsp;
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};
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/* the list of all conferences */
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struct dsp_conf {
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struct list_head list;
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u32 id;
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/* all cmx stacks with the same ID are
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connected */
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struct list_head mlist;
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int software; /* conf is processed by software */
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int hardware; /* conf is processed by hardware */
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/* note: if both unset, has only one member */
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};
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/**************
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* DTMF stuff *
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**************/
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#define DSP_DTMF_NPOINTS 102
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#define ECHOCAN_BUFF_SIZE 0x400 /* must be 2**n */
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#define ECHOCAN_BUFF_MASK 0x3ff /* -1 */
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struct dsp_dtmf {
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int treshold; /* above this is dtmf (square of) */
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int software; /* dtmf uses software decoding */
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int hardware; /* dtmf uses hardware decoding */
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int size; /* number of bytes in buffer */
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signed short buffer[DSP_DTMF_NPOINTS];
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/* buffers one full dtmf frame */
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u8 lastwhat, lastdigit;
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int count;
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u8 digits[16]; /* dtmf result */
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};
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/******************
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* pipeline stuff *
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******************/
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struct dsp_pipeline {
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rwlock_t lock;
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struct list_head list;
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int inuse;
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};
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/***************
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* tones stuff *
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***************/
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struct dsp_tone {
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int software; /* tones are generated by software */
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int hardware; /* tones are generated by hardware */
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int tone;
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void *pattern;
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int count;
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int index;
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struct timer_list tl;
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};
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/***************
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* echo stuff *
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***************/
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struct dsp_echo {
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int software; /* echo is generated by software */
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int hardware; /* echo is generated by hardware */
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};
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/*****************
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* general stuff *
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*****************/
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struct dsp {
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struct list_head list;
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struct mISDNchannel ch;
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struct mISDNchannel *up;
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unsigned char name[64];
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int b_active;
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struct dsp_echo echo;
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int rx_disabled; /* what the user wants */
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int rx_is_off; /* what the card is */
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int tx_mix;
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struct dsp_tone tone;
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struct dsp_dtmf dtmf;
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int tx_volume, rx_volume;
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/* queue for sending frames */
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struct work_struct workq;
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struct sk_buff_head sendq;
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int hdlc; /* if mode is hdlc */
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int data_pending; /* currently an unconfirmed frame */
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/* conference stuff */
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u32 conf_id;
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struct dsp_conf *conf;
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struct dsp_conf_member
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*member;
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/* buffer stuff */
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int rx_W; /* current write pos for data without timestamp */
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int rx_R; /* current read pos for transmit clock */
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int rx_init; /* if set, pointers will be adjusted first */
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int tx_W; /* current write pos for transmit data */
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int tx_R; /* current read pos for transmit clock */
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int rx_delay[MAX_SECONDS_JITTER_CHECK];
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int tx_delay[MAX_SECONDS_JITTER_CHECK];
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u8 tx_buff[CMX_BUFF_SIZE];
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u8 rx_buff[CMX_BUFF_SIZE];
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int last_tx; /* if set, we transmitted last poll interval */
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int cmx_delay; /* initial delay of buffers,
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or 0 for dynamic jitter buffer */
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int tx_dejitter; /* if set, dejitter tx buffer */
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int tx_data; /* enables tx-data of CMX to upper layer */
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/* hardware stuff */
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struct dsp_features features;
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int features_rx_off; /* set if rx_off is featured */
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int features_fill_empty; /* set if fill_empty is featured */
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int pcm_slot_rx; /* current PCM slot (or -1) */
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int pcm_bank_rx;
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int pcm_slot_tx;
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int pcm_bank_tx;
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int hfc_conf; /* unique id of current conference (or -1) */
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/* encryption stuff */
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int bf_enable;
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u32 bf_p[18];
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u32 bf_s[1024];
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int bf_crypt_pos;
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u8 bf_data_in[9];
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u8 bf_crypt_out[9];
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int bf_decrypt_in_pos;
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int bf_decrypt_out_pos;
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u8 bf_crypt_inring[16];
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u8 bf_data_out[9];
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int bf_sync;
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struct dsp_pipeline
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pipeline;
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};
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/* functions */
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extern void dsp_change_volume(struct sk_buff *skb, int volume);
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extern struct list_head dsp_ilist;
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extern struct list_head conf_ilist;
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extern void dsp_cmx_debug(struct dsp *dsp);
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extern void dsp_cmx_hardware(struct dsp_conf *conf, struct dsp *dsp);
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extern int dsp_cmx_conf(struct dsp *dsp, u32 conf_id);
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extern void dsp_cmx_receive(struct dsp *dsp, struct sk_buff *skb);
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extern void dsp_cmx_hdlc(struct dsp *dsp, struct sk_buff *skb);
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extern void dsp_cmx_send(void *arg);
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extern void dsp_cmx_transmit(struct dsp *dsp, struct sk_buff *skb);
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extern int dsp_cmx_del_conf_member(struct dsp *dsp);
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extern int dsp_cmx_del_conf(struct dsp_conf *conf);
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extern void dsp_dtmf_goertzel_init(struct dsp *dsp);
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extern void dsp_dtmf_hardware(struct dsp *dsp);
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extern u8 *dsp_dtmf_goertzel_decode(struct dsp *dsp, u8 *data, int len,
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int fmt);
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extern int dsp_tone(struct dsp *dsp, int tone);
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extern void dsp_tone_copy(struct dsp *dsp, u8 *data, int len);
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extern void dsp_tone_timeout(void *arg);
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extern void dsp_bf_encrypt(struct dsp *dsp, u8 *data, int len);
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extern void dsp_bf_decrypt(struct dsp *dsp, u8 *data, int len);
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extern int dsp_bf_init(struct dsp *dsp, const u8 *key, unsigned int keylen);
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extern void dsp_bf_cleanup(struct dsp *dsp);
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extern int dsp_pipeline_module_init(void);
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extern void dsp_pipeline_module_exit(void);
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extern int dsp_pipeline_init(struct dsp_pipeline *pipeline);
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extern void dsp_pipeline_destroy(struct dsp_pipeline *pipeline);
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extern int dsp_pipeline_build(struct dsp_pipeline *pipeline, const char *cfg);
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extern void dsp_pipeline_process_tx(struct dsp_pipeline *pipeline, u8 *data,
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int len);
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extern void dsp_pipeline_process_rx(struct dsp_pipeline *pipeline, u8 *data,
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int len, unsigned int txlen);
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