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