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 accelleration 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_BUFLEN (4*128)
 116
 117 struct dsp_dtmf {
 118         int             treshold; /* above this is dtmf (square of) */
 119         int             software; /* dtmf uses software decoding */
 120         int             hardware; /* dtmf uses hardware decoding */
 121         int             size; /* number of bytes in buffer */
 122         signed short    buffer[DSP_DTMF_NPOINTS];
 123                 /* buffers one full dtmf frame */
 124         u8              lastwhat, lastdigit;
 125         int             count;
 126         u8              digits[16]; /* just the dtmf result */
 127 };
 128
 129
 130 /******************
 131  * pipeline stuff *
 132  ******************/
 133 struct dsp_pipeline {
 134         rwlock_t  lock;
 135         struct list_head list;
 136         int inuse;
 137 };
 138
 139 /***************
 140  * tones stuff *
 141  ***************/
 142
 143 struct dsp_tone {
 144         int             software; /* tones are generated by software */
 145         int             hardware; /* tones are generated by hardware */
 146         int             tone;
 147         void            *pattern;
 148         int             count;
 149         int             index;
 150         struct timer_list tl;
 151 };
 152
 153 /*****************
 154  * general stuff *
 155  *****************/
 156
 157 struct dsp {
 158         struct list_head list;
 159         struct mISDNchannel     ch;
 160         struct mISDNchannel     *up;
 161         unsigned char   name[64];
 162         int             b_active;
 163         int             echo; /* echo is enabled */
 164         int             rx_disabled; /* what the user wants */
 165         int             rx_is_off; /* what the card is */
 166         int             tx_mix;
 167         struct dsp_tone tone;
 168         struct dsp_dtmf dtmf;
 169         int             tx_volume, rx_volume;
 170
 171         /* queue for sending frames */
 172         struct work_struct      workq;
 173         struct sk_buff_head     sendq;
 174         int             hdlc;   /* if mode is hdlc */
 175         int             data_pending;   /* currently an unconfirmed frame */
 176
 177         /* conference stuff */
 178         u32             conf_id;
 179         struct dsp_conf *conf;
 180         struct dsp_conf_member
 181                         *member;
 182
 183         /* buffer stuff */
 184         int             rx_W; /* current write pos for data without timestamp */
 185         int             rx_R; /* current read pos for transmit clock */
 186         int             rx_init; /* if set, pointers will be adjusted first */
 187         int             tx_W; /* current write pos for transmit data */
 188         int             tx_R; /* current read pos for transmit clock */
 189         int             rx_delay[MAX_SECONDS_JITTER_CHECK];
 190         int             tx_delay[MAX_SECONDS_JITTER_CHECK];
 191         u8              tx_buff[CMX_BUFF_SIZE];
 192         u8              rx_buff[CMX_BUFF_SIZE];
 193         int             last_tx; /* if set, we transmitted last poll interval */
 194         int             cmx_delay; /* initial delay of buffers,
 195                                 or 0 for dynamic jitter buffer */
 196         int             tx_dejitter; /* if set, dejitter tx buffer */
 197         int             tx_data; /* enables tx-data of CMX to upper layer */
 198
 199         /* hardware stuff */
 200         struct dsp_features features;
 201         int             features_rx_off; /* set if rx_off is featured */
 202         int             features_fill_empty; /* set if fill_empty is featured */
 203         int             pcm_slot_rx; /* current PCM slot (or -1) */
 204         int             pcm_bank_rx;
 205         int             pcm_slot_tx;
 206         int             pcm_bank_tx;
 207         int             hfc_conf; /* unique id of current conference (or -1) */
 208
 209         /* encryption stuff */
 210         int             bf_enable;
 211         u32             bf_p[18];
 212         u32             bf_s[1024];
 213         int             bf_crypt_pos;
 214         u8              bf_data_in[9];
 215         u8              bf_crypt_out[9];
 216         int             bf_decrypt_in_pos;
 217         int             bf_decrypt_out_pos;
 218         u8              bf_crypt_inring[16];
 219         u8              bf_data_out[9];
 220         int             bf_sync;
 221
 222         struct dsp_pipeline
 223                         pipeline;
 224 };
 225
 226 /* functions */
 227
 228 extern void dsp_change_volume(struct sk_buff *skb, int volume);
 229
 230 extern struct list_head dsp_ilist;
 231 extern struct list_head conf_ilist;
 232 extern void dsp_cmx_debug(struct dsp *dsp);
 233 extern void dsp_cmx_hardware(struct dsp_conf *conf, struct dsp *dsp);
 234 extern int dsp_cmx_conf(struct dsp *dsp, u32 conf_id);
 235 extern void dsp_cmx_receive(struct dsp *dsp, struct sk_buff *skb);
 236 extern void dsp_cmx_hdlc(struct dsp *dsp, struct sk_buff *skb);
 237 extern void dsp_cmx_send(void *arg);
 238 extern void dsp_cmx_transmit(struct dsp *dsp, struct sk_buff *skb);
 239 extern int dsp_cmx_del_conf_member(struct dsp *dsp);
 240 extern int dsp_cmx_del_conf(struct dsp_conf *conf);
 241
 242 extern void dsp_dtmf_goertzel_init(struct dsp *dsp);
 243 extern void dsp_dtmf_hardware(struct dsp *dsp);
 244 extern u8 *dsp_dtmf_goertzel_decode(struct dsp *dsp, u8 *data, int len,
 245                 int fmt);
 246
 247 extern int dsp_tone(struct dsp *dsp, int tone);
 248 extern void dsp_tone_copy(struct dsp *dsp, u8 *data, int len);
 249 extern void dsp_tone_timeout(void *arg);
 250
 251 extern void dsp_bf_encrypt(struct dsp *dsp, u8 *data, int len);
 252 extern void dsp_bf_decrypt(struct dsp *dsp, u8 *data, int len);
 253 extern int dsp_bf_init(struct dsp *dsp, const u8 *key, unsigned int keylen);
 254 extern void dsp_bf_cleanup(struct dsp *dsp);
 255
 256 extern int  dsp_pipeline_module_init(void);
 257 extern void dsp_pipeline_module_exit(void);
 258 extern int  dsp_pipeline_init(struct dsp_pipeline *pipeline);
 259 extern void dsp_pipeline_destroy(struct dsp_pipeline *pipeline);
 260 extern int  dsp_pipeline_build(struct dsp_pipeline *pipeline, const char *cfg);
 261 extern void dsp_pipeline_process_tx(struct dsp_pipeline *pipeline, u8 *data,
 262                 int len);
 263 extern void dsp_pipeline_process_rx(struct dsp_pipeline *pipeline, u8 *data,
 264                 int len);
 265