drivers/isdn/mISDN/dsp.h

   1 /*
   2  * Audio support data for ISDN4Linux.
   3  *
   4  * Copyright 2002/2003 by Andreas Eversberg (jolly@eversberg.eu)
   5  *
   6  * This software may be used and distributed according to the terms
   7  * of the GNU General Public License, incorporated herein by reference.
   8  *
   9  */
  10
  11 #define DEBUG_DSP_CTRL          0x0001
  12 #define DEBUG_DSP_CORE          0x0002
  13 #define DEBUG_DSP_DTMF          0x0004
  14 #define DEBUG_DSP_CMX           0x0010
  15 #define DEBUG_DSP_TONE          0x0020
  16 #define DEBUG_DSP_BLOWFISH      0x0040
  17 #define DEBUG_DSP_DELAY         0x0100
  18 #define DEBUG_DSP_CLOCK         0x0200
  19 #define DEBUG_DSP_DTMFCOEFF     0x8000 /* heavy output */
  20
  21 /* options may be:
  22  *
  23  * bit 0 = use ulaw instead of alaw
  24  * bit 1 = enable hfc hardware acceleration for all channels
  25  *
  26  */
  27 #define DSP_OPT_ULAW            (1 << 0)
  28 #define DSP_OPT_NOHARDWARE      (1 << 1)
  29
  30 #include <linux/timer.h>
  31 #include <linux/workqueue.h>
  32
  33 #include "dsp_ecdis.h"
  34
  35 extern int dsp_options;
  36 extern int dsp_debug;
  37 extern int dsp_poll;
  38 extern int dsp_tics;
  39 extern spinlock_t dsp_lock;
  40 extern struct work_struct dsp_workq;
  41 extern u32 dsp_poll_diff; /* calculated fix-comma corrected poll value */
  42
  43 /***************
  44  * audio stuff *
  45  ***************/
  46
  47 extern s32 dsp_audio_alaw_to_s32[256];
  48 extern s32 dsp_audio_ulaw_to_s32[256];
  49 extern s32 *dsp_audio_law_to_s32;
  50 extern u8 dsp_audio_s16_to_law[65536];
  51 extern u8 dsp_audio_alaw_to_ulaw[256];
  52 extern u8 dsp_audio_mix_law[65536];
  53 extern u8 dsp_audio_seven2law[128];
  54 extern u8 dsp_audio_law2seven[256];
  55 extern void dsp_audio_generate_law_tables(void);
  56 extern void dsp_audio_generate_s2law_table(void);
  57 extern void dsp_audio_generate_seven(void);
  58 extern void dsp_audio_generate_mix_table(void);
  59 extern void dsp_audio_generate_ulaw_samples(void);
  60 extern void dsp_audio_generate_volume_changes(void);
  61 extern u8 dsp_silence;
  62
  63
  64 /*************
  65  * cmx stuff *
  66  *************/
  67
  68 #define MAX_POLL        256     /* maximum number of send-chunks */
  69
  70 #define CMX_BUFF_SIZE   0x8000  /* must be 2**n (0x1000 about 1/2 second) */
  71 #define CMX_BUFF_HALF   0x4000  /* CMX_BUFF_SIZE / 2 */
  72 #define CMX_BUFF_MASK   0x7fff  /* CMX_BUFF_SIZE - 1 */
  73
  74 /* how many seconds will we check the lowest delay until the jitter buffer
  75    is reduced by that delay */
  76 #define MAX_SECONDS_JITTER_CHECK 5
  77
  78 extern struct timer_list dsp_spl_tl;
  79
  80 /* the datatype need to match jiffies datatype */
  81 extern unsigned long dsp_spl_jiffies;
  82
  83 /* the structure of conferences:
  84  *
  85  * each conference has a unique number, given by user space.
  86  * the conferences are linked in a chain.
  87  * each conference has members linked in a chain.
  88  * each dsplayer points to a member, each member points to a dsplayer.
  89  */
  90
  91 /* all members within a conference (this is linked 1:1 with the dsp) */
  92 struct dsp;
  93 struct dsp_conf_member {
  94         struct list_head        list;
  95         struct dsp              *dsp;
  96 };
  97
  98 /* the list of all conferences */
  99 struct dsp_conf {
 100         struct list_head        list;
 101         u32                     id;
 102         /* all cmx stacks with the same ID are
 103            connected */
 104         struct list_head        mlist;
 105         int                     software; /* conf is processed by software */
 106         int                     hardware; /* conf is processed by hardware */
 107         /* note: if both unset, has only one member */
 108 };
 109
 110
 111 /**************
 112  * DTMF stuff *
 113  **************/
 114
 115 #define DSP_DTMF_NPOINTS 102
 116
 117 #define ECHOCAN_BUFF_SIZE 0x400 /* must be 2**n */
 118 #define ECHOCAN_BUFF_MASK 0x3ff /* -1 */
 119
 120 struct dsp_dtmf {
 121         int             enable; /* dtmf is enabled */
 122         int             treshold; /* above this is dtmf (square of) */
 123         int             software; /* dtmf uses software decoding */
 124         int             hardware; /* dtmf uses hardware decoding */
 125         int             size; /* number of bytes in buffer */
 126         signed short    buffer[DSP_DTMF_NPOINTS];
 127         /* buffers one full dtmf frame */
 128         u8              lastwhat, lastdigit;
 129         int             count;
 130         u8              digits[16]; /* dtmf result */
 131 };
 132
 133
 134 /******************
 135  * pipeline stuff *
 136  ******************/
 137 struct dsp_pipeline {
 138         rwlock_t  lock;
 139         struct list_head list;
 140         int inuse;
 141 };
 142
 143 /***************
 144  * tones stuff *
 145  ***************/
 146
 147 struct dsp_tone {
 148         int             software; /* tones are generated by software */
 149         int             hardware; /* tones are generated by hardware */
 150         int             tone;
 151         void            *pattern;
 152         int             count;
 153         int             index;
 154         struct timer_list tl;
 155 };
 156
 157 /***************
 158  * echo stuff *
 159  ***************/
 160
 161 struct dsp_echo {
 162         int             software; /* echo is generated by software */
 163         int             hardware; /* echo is generated by hardware */
 164 };
 165
 166 /*****************
 167  * general stuff *
 168  *****************/
 169
 170 struct dsp {
 171         struct list_head list;
 172         struct mISDNchannel     ch;
 173         struct mISDNchannel     *up;
 174         unsigned char   name[64];
 175         int             b_active;
 176         struct dsp_echo echo;
 177         int             rx_disabled; /* what the user wants */
 178         int             rx_is_off; /* what the card is */
 179         int             tx_mix;
 180         struct dsp_tone tone;
 181         struct dsp_dtmf dtmf;
 182         int             tx_volume, rx_volume;
 183
 184         /* queue for sending frames */
 185         struct work_struct      workq;
 186         struct sk_buff_head     sendq;
 187         int             hdlc;   /* if mode is hdlc */
 188         int             data_pending;   /* currently an unconfirmed frame */
 189
 190         /* conference stuff */
 191         u32             conf_id;
 192         struct dsp_conf *conf;
 193         struct dsp_conf_member
 194         *member;
 195
 196         /* buffer stuff */
 197         int             rx_W; /* current write pos for data without timestamp */
 198         int             rx_R; /* current read pos for transmit clock */
 199         int             rx_init; /* if set, pointers will be adjusted first */
 200         int             tx_W; /* current write pos for transmit data */
 201         int             tx_R; /* current read pos for transmit clock */
 202         int             rx_delay[MAX_SECONDS_JITTER_CHECK];
 203         int             tx_delay[MAX_SECONDS_JITTER_CHECK];
 204         u8              tx_buff[CMX_BUFF_SIZE];
 205         u8              rx_buff[CMX_BUFF_SIZE];
 206         int             last_tx; /* if set, we transmitted last poll interval */
 207         int             cmx_delay; /* initial delay of buffers,
 208                                       or 0 for dynamic jitter buffer */
 209         int             tx_dejitter; /* if set, dejitter tx buffer */
 210         int             tx_data; /* enables tx-data of CMX to upper layer */
 211
 212         /* hardware stuff */
 213         struct dsp_features features;
 214         int             features_rx_off; /* set if rx_off is featured */
 215         int             features_fill_empty; /* set if fill_empty is featured */
 216         int             pcm_slot_rx; /* current PCM slot (or -1) */
 217         int             pcm_bank_rx;
 218         int             pcm_slot_tx;
 219         int             pcm_bank_tx;
 220         int             hfc_conf; /* unique id of current conference (or -1) */
 221
 222         /* encryption stuff */
 223         int             bf_enable;
 224         u32             bf_p[18];
 225         u32             bf_s[1024];
 226         int             bf_crypt_pos;
 227         u8              bf_data_in[9];
 228         u8              bf_crypt_out[9];
 229         int             bf_decrypt_in_pos;
 230         int             bf_decrypt_out_pos;
 231         u8              bf_crypt_inring[16];
 232         u8              bf_data_out[9];
 233         int             bf_sync;
 234
 235         struct dsp_pipeline
 236         pipeline;
 237 };
 238
 239 /* functions */
 240
 241 extern void dsp_change_volume(struct sk_buff *skb, int volume);
 242
 243 extern struct list_head dsp_ilist;
 244 extern struct list_head conf_ilist;
 245 extern void dsp_cmx_debug(struct dsp *dsp);
 246 extern void dsp_cmx_hardware(struct dsp_conf *conf, struct dsp *dsp);
 247 extern int dsp_cmx_conf(struct dsp *dsp, u32 conf_id);
 248 extern void dsp_cmx_receive(struct dsp *dsp, struct sk_buff *skb);
 249 extern void dsp_cmx_hdlc(struct dsp *dsp, struct sk_buff *skb);
 250 extern void dsp_cmx_send(void *arg);
 251 extern void dsp_cmx_transmit(struct dsp *dsp, struct sk_buff *skb);
 252 extern int dsp_cmx_del_conf_member(struct dsp *dsp);
 253 extern int dsp_cmx_del_conf(struct dsp_conf *conf);
 254
 255 extern void dsp_dtmf_goertzel_init(struct dsp *dsp);
 256 extern void dsp_dtmf_hardware(struct dsp *dsp);
 257 extern u8 *dsp_dtmf_goertzel_decode(struct dsp *dsp, u8 *data, int len,
 258                                     int fmt);
 259
 260 extern int dsp_tone(struct dsp *dsp, int tone);
 261 extern void dsp_tone_copy(struct dsp *dsp, u8 *data, int len);
 262 extern void dsp_tone_timeout(void *arg);
 263
 264 extern void dsp_bf_encrypt(struct dsp *dsp, u8 *data, int len);
 265 extern void dsp_bf_decrypt(struct dsp *dsp, u8 *data, int len);
 266 extern int dsp_bf_init(struct dsp *dsp, const u8 *key, unsigned int keylen);
 267 extern void dsp_bf_cleanup(struct dsp *dsp);
 268
 269 extern int  dsp_pipeline_module_init(void);
 270 extern void dsp_pipeline_module_exit(void);
 271 extern int  dsp_pipeline_init(struct dsp_pipeline *pipeline);
 272 extern void dsp_pipeline_destroy(struct dsp_pipeline *pipeline);
 273 extern int  dsp_pipeline_build(struct dsp_pipeline *pipeline, const char *cfg);
 274 extern void dsp_pipeline_process_tx(struct dsp_pipeline *pipeline, u8 *data,
 275                                     int len);
 276 extern void dsp_pipeline_process_rx(struct dsp_pipeline *pipeline, u8 *data,
 277                                     int len, unsigned int txlen);