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authorKarsten Keil <kkeil@suse.de>2008-07-26 19:56:38 -0400
committerKarsten Keil <kkeil@suse.de>2008-07-26 19:56:38 -0400
commit960366cf8dbb3359afaca30cf7fdbf69a6d6dda7 (patch)
tree261bc6e6584caf44d8d1fa319e6228431ac3b91d /drivers/isdn/mISDN/dsp.h
parent1b2b03f8e514e4f68e293846ba511a948b80243c (diff)
Add mISDN DSP
Enable support for digital audio processing capability. This module may be used for special applications that require cross connecting of bchannels, conferencing, dtmf decoding echo cancelation, tone generation, and Blowfish encryption and decryption. It may use hardware features if available. Signed-off-by: Karsten Keil <kkeil@suse.de>
Diffstat (limited to 'drivers/isdn/mISDN/dsp.h')
-rw-r--r--drivers/isdn/mISDN/dsp.h263
1 files changed, 263 insertions, 0 deletions
diff --git a/drivers/isdn/mISDN/dsp.h b/drivers/isdn/mISDN/dsp.h
new file mode 100644
index 000000000000..6c3fed6b8d4f
--- /dev/null
+++ b/drivers/isdn/mISDN/dsp.h
@@ -0,0 +1,263 @@
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
34extern int dsp_options;
35extern int dsp_debug;
36extern int dsp_poll;
37extern int dsp_tics;
38extern spinlock_t dsp_lock;
39extern struct work_struct dsp_workq;
40extern u32 dsp_poll_diff; /* calculated fix-comma corrected poll value */
41
42/***************
43 * audio stuff *
44 ***************/
45
46extern s32 dsp_audio_alaw_to_s32[256];
47extern s32 dsp_audio_ulaw_to_s32[256];
48extern s32 *dsp_audio_law_to_s32;
49extern u8 dsp_audio_s16_to_law[65536];
50extern u8 dsp_audio_alaw_to_ulaw[256];
51extern u8 dsp_audio_mix_law[65536];
52extern u8 dsp_audio_seven2law[128];
53extern u8 dsp_audio_law2seven[256];
54extern void dsp_audio_generate_law_tables(void);
55extern void dsp_audio_generate_s2law_table(void);
56extern void dsp_audio_generate_seven(void);
57extern void dsp_audio_generate_mix_table(void);
58extern void dsp_audio_generate_ulaw_samples(void);
59extern void dsp_audio_generate_volume_changes(void);
60extern 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
77extern struct timer_list dsp_spl_tl;
78extern 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) */
89struct dsp;
90struct dsp_conf_member {
91 struct list_head list;
92 struct dsp *dsp;
93};
94
95/* the list of all conferences */
96struct 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
116struct 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 ******************/
132struct dsp_pipeline {
133 rwlock_t lock;
134 struct list_head list;
135 int inuse;
136};
137
138/***************
139 * tones stuff *
140 ***************/
141
142struct 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
156struct 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 pcm_slot_rx; /* current PCM slot (or -1) */
202 int pcm_bank_rx;
203 int pcm_slot_tx;
204 int pcm_bank_tx;
205 int hfc_conf; /* unique id of current conference (or -1) */
206
207 /* encryption stuff */
208 int bf_enable;
209 u32 bf_p[18];
210 u32 bf_s[1024];
211 int bf_crypt_pos;
212 u8 bf_data_in[9];
213 u8 bf_crypt_out[9];
214 int bf_decrypt_in_pos;
215 int bf_decrypt_out_pos;
216 u8 bf_crypt_inring[16];
217 u8 bf_data_out[9];
218 int bf_sync;
219
220 struct dsp_pipeline
221 pipeline;
222};
223
224/* functions */
225
226extern void dsp_change_volume(struct sk_buff *skb, int volume);
227
228extern struct list_head dsp_ilist;
229extern struct list_head conf_ilist;
230extern void dsp_cmx_debug(struct dsp *dsp);
231extern void dsp_cmx_hardware(struct dsp_conf *conf, struct dsp *dsp);
232extern int dsp_cmx_conf(struct dsp *dsp, u32 conf_id);
233extern void dsp_cmx_receive(struct dsp *dsp, struct sk_buff *skb);
234extern void dsp_cmx_hdlc(struct dsp *dsp, struct sk_buff *skb);
235extern void dsp_cmx_send(void *arg);
236extern void dsp_cmx_transmit(struct dsp *dsp, struct sk_buff *skb);
237extern int dsp_cmx_del_conf_member(struct dsp *dsp);
238extern int dsp_cmx_del_conf(struct dsp_conf *conf);
239
240extern void dsp_dtmf_goertzel_init(struct dsp *dsp);
241extern void dsp_dtmf_hardware(struct dsp *dsp);
242extern u8 *dsp_dtmf_goertzel_decode(struct dsp *dsp, u8 *data, int len,
243 int fmt);
244
245extern int dsp_tone(struct dsp *dsp, int tone);
246extern void dsp_tone_copy(struct dsp *dsp, u8 *data, int len);
247extern void dsp_tone_timeout(void *arg);
248
249extern void dsp_bf_encrypt(struct dsp *dsp, u8 *data, int len);
250extern void dsp_bf_decrypt(struct dsp *dsp, u8 *data, int len);
251extern int dsp_bf_init(struct dsp *dsp, const u8 *key, unsigned int keylen);
252extern void dsp_bf_cleanup(struct dsp *dsp);
253
254extern int dsp_pipeline_module_init(void);
255extern void dsp_pipeline_module_exit(void);
256extern int dsp_pipeline_init(struct dsp_pipeline *pipeline);
257extern void dsp_pipeline_destroy(struct dsp_pipeline *pipeline);
258extern int dsp_pipeline_build(struct dsp_pipeline *pipeline, const char *cfg);
259extern void dsp_pipeline_process_tx(struct dsp_pipeline *pipeline, u8 *data,
260 int len);
261extern void dsp_pipeline_process_rx(struct dsp_pipeline *pipeline, u8 *data,
262 int len);
263
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