chan_phone.c

Asterisk中信道部分的源码 。。。。

{
	if (c == 12)
		return '#';
	else if (c == 11)
		return '*';
	else if ((c < 10) && (c >= 0))
		return '0' + c - 1;
	else
		return '?';
}
#endif

static struct ast_frame  *phone_exception(struct ast_channel *ast)
{
	int res;
	union telephony_exception phonee;
	struct phone_pvt *p = ast->tech_pvt;
	char digit;

	/* Some nice norms */
	p->fr.datalen = 0;
	p->fr.samples = 0;
	p->fr.data =  NULL;
	p->fr.src = "Phone";
	p->fr.offset = 0;
	p->fr.mallocd=0;
	p->fr.delivery = ast_tv(0,0);
	
	phonee.bytes = ioctl(p->fd, PHONE_EXCEPTION);
	if (phonee.bits.dtmf_ready)  {
		if (option_debug)
			ast_log(LOG_DEBUG, "phone_exception(): DTMF\n");
	
		/* We've got a digit -- Just handle this nicely and easily */
		digit =  ioctl(p->fd, PHONE_GET_DTMF_ASCII);
		p->fr.subclass = digit;
		p->fr.frametype = AST_FRAME_DTMF;
		return &p->fr;
	}
	if (phonee.bits.hookstate) {
		if (option_debug)
			ast_log(LOG_DEBUG, "Hookstate changed\n");
		res = ioctl(p->fd, PHONE_HOOKSTATE);
		/* See if we've gone on hook, if so, notify by returning NULL */
		if (option_debug)
			ast_log(LOG_DEBUG, "New hookstate: %d\n", res);
		if (!res && (p->mode != MODE_FXO))
			return NULL;
		else {
			if (ast->_state == AST_STATE_RINGING) {
				/* They've picked up the phone */
				p->fr.frametype = AST_FRAME_CONTROL;
				p->fr.subclass = AST_CONTROL_ANSWER;
				phone_setup(ast);
				ast_setstate(ast, AST_STATE_UP);
				return &p->fr;
			}  else 
				ast_log(LOG_WARNING, "Got off hook in weird state %d\n", ast->_state);
		}
	}
#if 1
	if (phonee.bits.pstn_ring)
		ast_verbose("Unit is ringing\n");
	if (phonee.bits.caller_id) {
		ast_verbose("We have caller ID\n");
	}
	if (phonee.bits.pstn_wink)
		ast_verbose("Detected Wink\n");
#endif
	/* Strange -- nothing there.. */
	p->fr.frametype = AST_FRAME_NULL;
	p->fr.subclass = 0;
	return &p->fr;
}

static struct ast_frame  *phone_read(struct ast_channel *ast)
{
	int res;
	struct phone_pvt *p = ast->tech_pvt;
	

	/* Some nice norms */
	p->fr.datalen = 0;
	p->fr.samples = 0;
	p->fr.data =  NULL;
	p->fr.src = "Phone";
	p->fr.offset = 0;
	p->fr.mallocd=0;
	p->fr.delivery = ast_tv(0,0);

	/* Try to read some data... */
	CHECK_BLOCKING(ast);
	res = read(p->fd, p->buf, PHONE_MAX_BUF);
	ast_clear_flag(ast, AST_FLAG_BLOCKING);
	if (res < 0) {
#if 0
		if (errno == EAGAIN) {
			ast_log(LOG_WARNING, "Null frame received\n");
			p->fr.frametype = AST_FRAME_NULL;
			p->fr.subclass = 0;
			return &p->fr;
		}
#endif
		ast_log(LOG_WARNING, "Error reading: %s\n", strerror(errno));
		return NULL;
	}
	p->fr.data = p->buf;
	if (p->mode != MODE_FXS)
	switch(p->buf[0] & 0x3) {
	case '0':
	case '1':
		/* Normal */
		break;
	case '2':
	case '3':
		/* VAD/CNG, only send two words */
		res = 4;
		break;
	}
	p->fr.samples = 240;
	p->fr.datalen = res;
	p->fr.frametype = p->lastinput <= AST_FORMAT_MAX_AUDIO ?
                          AST_FRAME_VOICE : 
			  p->lastinput <= AST_FORMAT_PNG ? AST_FRAME_IMAGE 
			  : AST_FRAME_VIDEO;
	p->fr.subclass = p->lastinput;
	p->fr.offset = AST_FRIENDLY_OFFSET;
	/* Byteswap from little-endian to native-endian */
	if (p->fr.subclass == AST_FORMAT_SLINEAR)
		ast_frame_byteswap_le(&p->fr);
	return &p->fr;
}

static int phone_write_buf(struct phone_pvt *p, const char *buf, int len, int frlen, int swap)
{
	int res;
	/* Store as much of the buffer as we can, then write fixed frames */
	int space = sizeof(p->obuf) - p->obuflen;
	/* Make sure we have enough buffer space to store the frame */
	if (space < len)
		len = space;
	if (swap)
		ast_swapcopy_samples(p->obuf+p->obuflen, buf, len/2);
	else
		memcpy(p->obuf + p->obuflen, buf, len);
	p->obuflen += len;
	while(p->obuflen > frlen) {
		res = write(p->fd, p->obuf, frlen);
		if (res != frlen) {
			if (res < 1) {
/*
 * Card is in non-blocking mode now and it works well now, but there are
 * lot of messages like this. So, this message is temporarily disabled.
 */
				return 0;
			} else {
				ast_log(LOG_WARNING, "Only wrote %d of %d bytes\n", res, frlen);
			}
		}
		p->obuflen -= frlen;
		/* Move memory if necessary */
		if (p->obuflen) 
			memmove(p->obuf, p->obuf + frlen, p->obuflen);
	}
	return len;
}

static int phone_send_text(struct ast_channel *ast, const char *text)
{
    int length = strlen(text);
    return phone_write_buf(ast->tech_pvt, text, length, length, 0) == 
           length ? 0 : -1;
}

static int phone_write(struct ast_channel *ast, struct ast_frame *frame)
{
	struct phone_pvt *p = ast->tech_pvt;
	int res;
	int maxfr=0;
	char *pos;
	int sofar;
	int expected;
	int codecset = 0;
	char tmpbuf[4];
	/* Write a frame of (presumably voice) data */
	if (frame->frametype != AST_FRAME_VOICE && p->mode != MODE_FXS) {
		if (frame->frametype != AST_FRAME_IMAGE)
			ast_log(LOG_WARNING, "Don't know what to do with  frame type '%d'\n", frame->frametype);
		return 0;
	}
	if (!(frame->subclass &
		(AST_FORMAT_G723_1 | AST_FORMAT_SLINEAR | AST_FORMAT_ULAW)) && 
	    p->mode != MODE_FXS) {
		ast_log(LOG_WARNING, "Cannot handle frames in %d format\n", frame->subclass);
		return -1;
	}
#if 0
	/* If we're not in up mode, go into up mode now */
	if (ast->_state != AST_STATE_UP) {
		ast_setstate(ast, AST_STATE_UP);
		phone_setup(ast);
	}
#else
	if (ast->_state != AST_STATE_UP) {
		/* Don't try tos end audio on-hook */
		return 0;
	}
#endif	
	if (frame->subclass == AST_FORMAT_G723_1) {
		if (p->lastformat != AST_FORMAT_G723_1) {
			ioctl(p->fd, PHONE_PLAY_STOP);
			ioctl(p->fd, PHONE_REC_STOP);
			if (ioctl(p->fd, PHONE_PLAY_CODEC, G723_63)) {
				ast_log(LOG_WARNING, "Unable to set G723.1 mode\n");
				return -1;
			}
			if (ioctl(p->fd, PHONE_REC_CODEC, G723_63)) {
				ast_log(LOG_WARNING, "Unable to set G723.1 mode\n");
				return -1;
			}
			p->lastformat = AST_FORMAT_G723_1;
			p->lastinput = AST_FORMAT_G723_1;
			/* Reset output buffer */
			p->obuflen = 0;
			codecset = 1;
		}
		if (frame->datalen > 24) {
			ast_log(LOG_WARNING, "Frame size too large for G.723.1 (%d bytes)\n", frame->datalen);
			return -1;
		}
		maxfr = 24;
	} else if (frame->subclass == AST_FORMAT_SLINEAR) {
		if (p->lastformat != AST_FORMAT_SLINEAR) {
			ioctl(p->fd, PHONE_PLAY_STOP);
			ioctl(p->fd, PHONE_REC_STOP);
			if (ioctl(p->fd, PHONE_PLAY_CODEC, LINEAR16)) {
				ast_log(LOG_WARNING, "Unable to set 16-bit linear mode\n");
				return -1;
			}
			if (ioctl(p->fd, PHONE_REC_CODEC, LINEAR16)) {
				ast_log(LOG_WARNING, "Unable to set 16-bit linear mode\n");
				return -1;
			}
			p->lastformat = AST_FORMAT_SLINEAR;
			p->lastinput = AST_FORMAT_SLINEAR;
			codecset = 1;
			/* Reset output buffer */
			p->obuflen = 0;
		}
		maxfr = 480;
	} else if (frame->subclass == AST_FORMAT_ULAW) {
		if (p->lastformat != AST_FORMAT_ULAW) {
			ioctl(p->fd, PHONE_PLAY_STOP);
			ioctl(p->fd, PHONE_REC_STOP);
			if (ioctl(p->fd, PHONE_PLAY_CODEC, ULAW)) {
				ast_log(LOG_WARNING, "Unable to set uLaw mode\n");
				return -1;
			}
			if (ioctl(p->fd, PHONE_REC_CODEC, ULAW)) {
				ast_log(LOG_WARNING, "Unable to set uLaw mode\n");
				return -1;
			}
			p->lastformat = AST_FORMAT_ULAW;
			p->lastinput = AST_FORMAT_ULAW;
			codecset = 1;
			/* Reset output buffer */
			p->obuflen = 0;
		}
		maxfr = 240;
	} else {
		if (p->lastformat != frame->subclass) {
			ioctl(p->fd, PHONE_PLAY_STOP);
			ioctl(p->fd, PHONE_REC_STOP);
			if (ioctl(p->fd, PHONE_PLAY_CODEC, frame->subclass)) {
				ast_log(LOG_WARNING, "Unable to set %d mode\n",
					frame->subclass);
				return -1;
			}
			if (ioctl(p->fd, PHONE_REC_CODEC, frame->subclass)) {
				ast_log(LOG_WARNING, "Unable to set %d mode\n",
					frame->subclass);
				return -1;
			}
			p->lastformat = frame->subclass;
			p->lastinput = frame->subclass;
			codecset = 1;
			/* Reset output buffer */
			p->obuflen = 0;
		}
		maxfr = 480;
	}
 	if (codecset) {
		ioctl(p->fd, PHONE_REC_DEPTH, 3);
		ioctl(p->fd, PHONE_PLAY_DEPTH, 3);
		if (ioctl(p->fd, PHONE_PLAY_START)) {
			ast_log(LOG_WARNING, "Failed to start playback\n");
			return -1;
		}
		if (ioctl(p->fd, PHONE_REC_START)) {
			ast_log(LOG_WARNING, "Failed to start recording\n");
			return -1;
		}
	}
	/* If we get here, we have a frame of Appropriate data */
	sofar = 0;
	pos = frame->data;
	while(sofar < frame->datalen) {
		/* Write in no more than maxfr sized frames */
		expected = frame->datalen - sofar;
		if (maxfr < expected)
			expected = maxfr;
		/* XXX Internet Phone Jack does not handle the 4-byte VAD frame properly! XXX 
		   we have to pad it to 24 bytes still.  */
		if (frame->datalen == 4) {
			if (p->silencesupression) {
				memset(tmpbuf + 4, 0, sizeof(tmpbuf) - 4);
				memcpy(tmpbuf, frame->data, 4);
				expected = 24;
				res = phone_write_buf(p, tmpbuf, expected, maxfr, 0);
			}
			res = 4;
			expected=4;
		} else {
			int swap = 0;
#if __BYTE_ORDER == __BIG_ENDIAN
			if (frame->subclass == AST_FORMAT_SLINEAR)
				swap = 1; /* Swap big-endian samples to little-endian as we copy */
#endif
			res = phone_write_buf(p, pos, expected, maxfr, swap);
		}
		if (res != expected) {
			if ((errno != EAGAIN) && (errno != EINTR)) {
				if (res < 0) 
					ast_log(LOG_WARNING, "Write returned error (%s)\n", strerror(errno));
	/*
	 * Card is in non-blocking mode now and it works well now, but there are
	 * lot of messages like this. So, this message is temporarily disabled.
	 */
#if 0
				else
					ast_log(LOG_WARNING, "Only wrote %d of %d bytes\n", res, frame->datalen);
#endif
				return -1;
			} else /* Pretend it worked */
				res = expected;
		}
		sofar += res;
		pos += res;
	}
	return 0;
}

static struct ast_channel *phone_new(struct phone_pvt *i, int state, char *context)
{
	struct ast_channel *tmp;
	struct phone_codec_data codec;
	tmp = ast_channel_alloc(1, state, i->cid_num, i->cid_name, "", i->ext, i->context, 0, "Phone/%s", i->dev + 5);
	if (tmp) {
		tmp->tech = cur_tech;
		tmp->fds[0] = i->fd;
		/* XXX Switching formats silently causes kernel panics XXX */
		if (i->mode == MODE_FXS &&
		    ioctl(i->fd, PHONE_QUERY_CODEC, &codec) == 0) {
			if (codec.type == LINEAR16)
				tmp->nativeformats =
				tmp->rawreadformat =
				tmp->rawwriteformat =
				AST_FORMAT_SLINEAR;
			else {
				tmp->nativeformats =
				tmp->rawreadformat =
				tmp->rawwriteformat =
				prefformat & ~AST_FORMAT_SLINEAR;
			}
		}
		else {
			tmp->nativeformats = prefformat;
			tmp->rawreadformat = prefformat;
			tmp->rawwriteformat = prefformat;
		}
		/* no need to call ast_setstate: the channel_alloc already did its job */
		if (state == AST_STATE_RING)
			tmp->rings = 1;
		tmp->tech_pvt = i;
		ast_copy_string(tmp->context, context, sizeof(tmp->context));
		if (!ast_strlen_zero(i->ext))
			ast_copy_string(tmp->exten, i->ext, sizeof(tmp->exten));
		else
			strcpy(tmp->exten, "s");
		if (!ast_strlen_zero(i->language))
			ast_string_field_set(tmp, language, i->language);

		/* Don't use ast_set_callerid() here because it will
		 * generate a NewCallerID event before the NewChannel event */
		tmp->cid.cid_ani = ast_strdup(i->cid_num);

		i->owner = tmp;
		ast_module_ref(ast_module_info->self);
		if (state != AST_STATE_DOWN) {
			if (state == AST_STATE_RING) {
				ioctl(tmp->fds[0], PHONE_RINGBACK);
				i->cpt = 1;
			}
			if (ast_pbx_start(tmp)) {
				ast_log(LOG_WARNING, "Unable to start PBX on %s\n", tmp->name);
				ast_hangup(tmp);
			}
		}
	} else
		ast_log(LOG_WARNING, "Unable to allocate channel structure\n");
	return tmp;
}

static void phone_mini_packet(struct phone_pvt *i)
{
	int res;
	char buf[1024];
	/* Ignore stuff we read... */
	res = read(i->fd, buf, sizeof(buf));
	if (res < 1) {
		ast_log(LOG_WARNING, "Read returned %d: %s\n", res, strerror(errno));
		return;
	}
}

static void phone_check_exception(struct phone_pvt *i)
{
	int offhook=0;
	char digit[2] = {0 , 0};
	union telephony_exception phonee;
	/* XXX Do something XXX */
#if 0
	ast_log(LOG_DEBUG, "Exception!\n");
#endif
	phonee.bytes = ioctl(i->fd, PHONE_EXCEPTION);
	if (phonee.bits.dtmf_ready)  {
		digit[0] = ioctl(i->fd, PHONE_GET_DTMF_ASCII);
		if (i->mode == MODE_DIALTONE || i->mode == MODE_FXS || i->mode == MODE_SIGMA) {
			ioctl(i->fd, PHONE_PLAY_STOP);
			ioctl(i->fd, PHONE_REC_STOP);
			ioctl(i->fd, PHONE_CPT_STOP);
			i->dialtone = 0;
			if (strlen(i->ext) < AST_MAX_EXTENSION - 1)
				strncat(i->ext, digit, sizeof(i->ext) - strlen(i->ext) - 1);
			if ((i->mode != MODE_FXS ||
			     !(phonee.bytes = ioctl(i->fd, PHONE_EXCEPTION)) ||
			     !phonee.bits.dtmf_ready) &&
			    ast_exists_extension(NULL, i->context, i->ext, 1, i->cid_num)) {
				/* It's a valid extension in its context, get moving! */
				phone_new(i, AST_STATE_RING, i->context);
				/* No need to restart monitor, we are the monitor */
			} else if (!ast_canmatch_extension(NULL, i->context, i->ext, 1, i->cid_num)) {
				/* There is nothing in the specified extension that can match anymore.
				   Try the default */
				if (ast_exists_extension(NULL, "default", i->ext, 1, i->cid_num)) {
					/* Check the default, too... */
					phone_new(i, AST_STATE_RING, "default");
					/* XXX This should probably be justified better XXX */
				}  else if (!ast_canmatch_extension(NULL, "default", i->ext, 1, i->cid_num)) {
					/* It's not a valid extension, give a busy signal */
					if (option_debug)
						ast_log(LOG_DEBUG, "%s can't match anything in %s or default\n", i->ext, i->context);
					ioctl(i->fd, PHONE_BUSY);
					i->cpt = 1;
				}
			}
#if 0
			ast_verbose("Extension is %s\n", i->ext);
#endif
		}
	}
	if (phonee.bits.hookstate) {
		offhook = ioctl(i->fd, PHONE_HOOKSTATE);
		if (offhook) {
			if (i->mode == MODE_IMMEDIATE) {
				phone_new(i, AST_STATE_RING, i->context);
			} else if (i->mode == MODE_DIALTONE) {
				ast_module_ref(ast_module_info->self);