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 extern u32 dsp_spl_jiffies;
  80
  81 /* the structure of conferences:
  82  *
  83  * each conference has a unique number, given by user space.
  84  * the conferences are linked in a chain.
  85  * each conference has members linked in a chain.
  86  * each dsplayer points to a member, each member points to a dsplayer.
  87  */
  88
  89 /* all members within a conference (this is linked 1:1 with the dsp) */
  90 struct dsp;
  91 struct dsp_conf_member {
  92         struct list_head        list;
  93         struct dsp              *dsp;
  94 };
  95
  96 /* the list of all conferences */
  97 struct dsp_conf {
  98         struct list_head        list;
  99         u32                     id;
 100                                 /* all cmx stacks with the same ID are
 101                                  connected */
 102         struct list_head        mlist;
 103         int                     software; /* conf is processed by software */
 104         int                     hardware; /* conf is processed by hardware */
 105                                 /* note: if both unset, has only one member */
 106 };
 107
 108
 109 /**************
 110  * DTMF stuff *
 111  **************/
 112
 113 #define DSP_DTMF_NPOINTS 102
 114
 115 #define ECHOCAN_BUFF_SIZE 0x400 /* must be 2**n */
 116 #define ECHOCAN_BUFF_MASK 0x3ff /* -1 */
 117
 118 struct dsp_dtmf {
 119         int             enable; /* dtmf is enabled */
 120         int             treshold; /* above this is dtmf (square of) */
 121         int             software; /* dtmf uses software decoding */
 122         int             hardware; /* dtmf uses hardware decoding */
 123         int             size; /* number of bytes in buffer */
 124         signed short    buffer[DSP_DTMF_NPOINTS];
 125                 /* buffers one full dtmf frame */
 126         u8              lastwhat, lastdigit;
 127         int             count;
 128         u8              digits[16]; /* dtmf result */
 129 };
 130
 131
 132 /******************
 133  * pipeline stuff *
 134  ******************/
 135 struct dsp_pipeline {
 136         rwlock_t  lock;
 137         struct list_head list;
 138         int inuse;
 139 };
 140
 141 /***************
 142  * tones stuff *
 143  ***************/
 144
 145 struct dsp_tone {
 146         int             software; /* tones are generated by software */
 147         int             hardware; /* tones are generated by hardware */
 148         int             tone;
 149         void            *pattern;
 150         int             count;
 151         int             index;
 152         struct timer_list tl;
 153 };
 154
 155 /***************
 156  * echo stuff *
 157  ***************/
 158
 159 struct dsp_echo {
 160         int             software; /* echo is generated by software */
 161         int             hardware; /* echo is generated by hardware */
 162 };
 163
 164 /*****************
 165  * general stuff *
 166  *****************/
 167
 168 struct dsp {
 169         struct list_head list;
 170         struct mISDNchannel     ch;
 171         struct mISDNchannel     *up;
 172         unsigned char   name[64];
 173         int             b_active;
 174         struct dsp_echo echo;
 175         int             rx_disabled; /* what the user wants */
 176         int             rx_is_off; /* what the card is */
 177         int             tx_mix;
 178         struct dsp_tone tone;
 179         struct dsp_dtmf dtmf;
 180         int             tx_volume, rx_volume;
 181
 182         /* queue for sending frames */
 183         struct work_struct      workq;
 184         struct sk_buff_head     sendq;
 185         int             hdlc;   /* if mode is hdlc */
 186         int             data_pending;   /* currently an unconfirmed frame */
 187
 188         /* conference stuff */
 189         u32             conf_id;
 190         struct dsp_conf *conf;
 191         struct dsp_conf_member
 192                         *member;
 193
 194         /* buffer stuff */
 195         int             rx_W; /* current write pos for data without timestamp */
 196         int             rx_R; /* current read pos for transmit clock */
 197         int             rx_init; /* if set, pointers will be adjusted first */
 198         int             tx_W; /* current write pos for transmit data */
 199         int             tx_R; /* current read pos for transmit clock */
 200         int             rx_delay[MAX_SECONDS_JITTER_CHECK];
 201         int             tx_delay[MAX_SECONDS_JITTER_CHECK];
 202         u8              tx_buff[CMX_BUFF_SIZE];
 203         u8              rx_buff[CMX_BUFF_SIZE];
 204         int             last_tx; /* if set, we transmitted last poll interval */
 205         int             cmx_delay; /* initial delay of buffers,
 206                                 or 0 for dynamic jitter buffer */
 207         int             tx_dejitter; /* if set, dejitter tx buffer */
 208         int             tx_data; /* enables tx-data of CMX to upper layer */
 209
 210         /* hardware stuff */
 211         struct dsp_features features;
 212         int             features_rx_off; /* set if rx_off is featured */
 213         int             features_fill_empty; /* set if fill_empty is featured */
 214         int             pcm_slot_rx; /* current PCM slot (or -1) */
 215         int             pcm_bank_rx;
 216         int             pcm_slot_tx;
 217         int             pcm_bank_tx;
 218         int             hfc_conf; /* unique id of current conference (or -1) */
 219
 220         /* encryption stuff */
 221         int             bf_enable;
 222         u32             bf_p[18];
 223         u32             bf_s[1024];
 224         int             bf_crypt_pos;
 225         u8              bf_data_in[9];
 226         u8              bf_crypt_out[9];
 227         int             bf_decrypt_in_pos;
 228         int             bf_decrypt_out_pos;
 229         u8              bf_crypt_inring[16];
 230         u8              bf_data_out[9];
 231         int             bf_sync;
 232
 233         struct dsp_pipeline
 234                         pipeline;
 235 };
 236
 237 /* functions */
 238
 239 extern void dsp_change_volume(struct sk_buff *skb, int volume);
 240
 241 extern struct list_head dsp_ilist;
 242 extern struct list_head conf_ilist;
 243 extern void dsp_cmx_debug(struct dsp *dsp);
 244 extern void dsp_cmx_hardware(struct dsp_conf *conf, struct dsp *dsp);
 245 extern int dsp_cmx_conf(struct dsp *dsp, u32 conf_id);
 246 extern void dsp_cmx_receive(struct dsp *dsp, struct sk_buff *skb);
 247 extern void dsp_cmx_hdlc(struct dsp *dsp, struct sk_buff *skb);
 248 extern void dsp_cmx_send(void *arg);
 249 extern void dsp_cmx_transmit(struct dsp *dsp, struct sk_buff *skb);
 250 extern int dsp_cmx_del_conf_member(struct dsp *dsp);
 251 extern int dsp_cmx_del_conf(struct dsp_conf *conf);
 252
 253 extern void dsp_dtmf_goertzel_init(struct dsp *dsp);
 254 extern void dsp_dtmf_hardware(struct dsp *dsp);
 255 extern u8 *dsp_dtmf_goertzel_decode(struct dsp *dsp, u8 *data, int len,
 256                 int fmt);
 257
 258 extern int dsp_tone(struct dsp *dsp, int tone);
 259 extern void dsp_tone_copy(struct dsp *dsp, u8 *data, int len);
 260 extern void dsp_tone_timeout(void *arg);
 261
 262 extern void dsp_bf_encrypt(struct dsp *dsp, u8 *data, int len);
 263 extern void dsp_bf_decrypt(struct dsp *dsp, u8 *data, int len);
 264 extern int dsp_bf_init(struct dsp *dsp, const u8 *key, unsigned int keylen);
 265 extern void dsp_bf_cleanup(struct dsp *dsp);
 266
 267 extern int  dsp_pipeline_module_init(void);
 268 extern void dsp_pipeline_module_exit(void);
 269 extern int  dsp_pipeline_init(struct dsp_pipeline *pipeline);
 270 extern void dsp_pipeline_destroy(struct dsp_pipeline *pipeline);
 271 extern int  dsp_pipeline_build(struct dsp_pipeline *pipeline, const char *cfg);
 272 extern void dsp_pipeline_process_tx(struct dsp_pipeline *pipeline, u8 *data,
 273                 int len);
 274 extern void dsp_pipeline_process_rx(struct dsp_pipeline *pipeline, u8 *data,
 275                 int len, unsigned int txlen);
 276