Merge codec_zap support for the transcoder card. This is a standalone codec

module so it will not affect anything else.


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@51410 65c4cc65-6c06-0410-ace0-fbb531ad65f3

codecs/Makefile

@@ -28,6 +28,19 @@ ifneq ($(wildcard g723.1b/coder2.c),)
   LIBG723B=g723.1b/libg723b.a
 endif
 
+ifndef WITHOUT_ZAPTEL
+ifneq ($(wildcard $(CROSS_COMPILE_TARGET)/usr/include/linux/zaptel.h)$(wildcard $(CROSS_COMPILE_TARGET)/usr/local/include/zaptel.h)$(wildcard $(CROSS_COMPILE_TARGET)/usr/pkg/include/zaptel.h),)
+  ifeq (${OSARCH},NetBSD)
+    SOLINK+=-L$(CROSS_COMPILE_TARGET)/usr/pkg/lib
+  endif
+  ifeq (${OSARCH},FreeBSD)
+    SOLINK+=-L$(CROSS_COMPILE_TARGET)/usr/local/lib
+  endif
+  CODECS+=codec_zap.so
+endif
+endif # WITHOUT_ZAPTEL
+
+
 UI_SPEEX=$(wildcard $(CROSS_COMPILE_TARGET)/usr/include/speex.h)
 UIS_SPEEX=$(wildcard $(CROSS_COMPILE_TARGET)/usr/include/speex/speex.h)
 ULI_SPEEX=$(wildcard $(CROSS_COMPILE_TARGET)/usr/local/include/speex.h)

codecs/codec_zap.c

@@ -0,0 +1,928 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Zaptel native transcoding support
+ *
+ * Copyright (C) 1999 - 2006, Digium, Inc.
+ *
+ * Mark Spencer <markster@digium.com>
+ * Kevin P. Fleming <kpfleming@digium.com>
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+
+/*! \file
+ *
+ * \brief Translate between various formats natively through Zaptel transcoding
+ *
+ * \ingroup codecs
+ */
+
+#include "asterisk.h"
+
+ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
+
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <netinet/in.h>
+#include <string.h>
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include <errno.h>
+#include <sys/mman.h>
+#include <zaptel/zaptel.h>
+
+#include "asterisk/lock.h"
+#include "asterisk/translate.h"
+#include "asterisk/config.h"
+#include "asterisk/options.h"
+#include "asterisk/module.h"
+#include "asterisk/cli.h"
+#include "asterisk/logger.h"
+#include "asterisk/channel.h"
+#include "asterisk/utils.h"
+#include "asterisk/linkedlists.h"
+
+#define BUFFER_SAMPLES	8000
+
+static unsigned int global_useplc = 0;
+static int cardsmode = 0;
+
+static int totalchannels = 0;
+static int complexinuse = 0;
+static int simpleinuse = 0;
+static int localusecnt = 0;
+AST_MUTEX_DEFINE_STATIC(channelcount);
+
+static char *tdesc = "Generic Zaptel Transcoder Codec Translator";
+
+static char show_transcoder_usage[] =
+"Usage: show transcoder\n"
+"       Displays transcoder utilization.\n";
+
+static int show_transcoder(int fd, int argc, char **argv);
+
+static struct ast_cli_entry transcoder_cli[] = {
+	{ { "show", "transcoder", NULL},
+	show_transcoder, "Displays transcoder utilization.",
+	show_transcoder_usage}
+};
+
+struct format_map {
+	unsigned int map[32][32];
+};
+
+static struct format_map global_format_map = { { { 0 } } };
+
+struct translator {
+	struct ast_translator t;
+	AST_LIST_ENTRY(translator) entry;
+};
+
+static AST_LIST_HEAD_STATIC(zap_translators, translator);
+
+struct ast_translator_pvt {
+	int fd;
+	int fake;
+	int inuse;
+	int samples;
+	int dstfmt;
+	int srcfmt;
+#ifdef DEBUG_TRANSCODE
+	int totalms;
+	int lasttotalms;
+#endif
+	struct zt_transcode_header *hdr;
+	struct ast_frame f;
+};
+
+
+static int show_transcoder(int fd, int argc, char **argv)
+{
+	ast_mutex_lock(&channelcount);
+	if (!totalchannels) { 
+		ast_cli(fd, "No transcoder card registered\n");
+		ast_mutex_unlock(&channelcount);
+		return RESULT_SUCCESS;
+	}
+	if(!cardsmode)
+		ast_cli(fd, "%d/%d encoders/decoders of %d channels (G.729a / G.723.1 5.3 kbps) are in use.\n",complexinuse, simpleinuse, totalchannels);
+	else if (cardsmode == 1)
+		ast_cli(fd, "%d/%d encoders/decoders of %d channels (G.729a) are in use.\n",complexinuse, simpleinuse, totalchannels);
+	else if (cardsmode == 2)
+		ast_cli(fd, "%d/%d encoders/decoders of %d channels (G.723.1 5.3 kbps) are in use.\n",complexinuse, simpleinuse, totalchannels);
+
+	ast_mutex_unlock(&channelcount);
+	return RESULT_SUCCESS;
+}
+
+static int zap_framein(struct ast_translator_pvt *ztp, struct ast_frame *f)
+{
+	struct zt_transcode_header *hdr = ztp->hdr;
+	if (!f->subclass) {
+		/* Fake a return frame for calculation purposes */
+		ztp->fake = 2;
+		ztp->samples = f->samples;
+		return 0;
+	}
+	if(!ztp->inuse) {
+		ast_mutex_lock(&channelcount);
+		localusecnt++;
+		if(ztp->dstfmt == 8 || ztp->dstfmt == 0 ) 
+			complexinuse++;
+		else 
+			simpleinuse++;
+		ast_mutex_unlock(&channelcount);
+		ztp->inuse = 1;
+	}
+	if (!hdr->srclen)
+		/* Copy at front of buffer */
+		hdr->srcoffset = 0;
+
+	if (hdr->srclen + f->datalen > sizeof(hdr->srcdata)) {
+		ast_log(LOG_WARNING, "Out of space for codec translation!\n");
+		return -1;
+	}
+
+	if (hdr->srclen + f->datalen + hdr->srcoffset > sizeof(hdr->srcdata)) {
+		/* Very unlikely */
+		memmove(hdr->srcdata, hdr->srcdata + hdr->srcoffset, hdr->srclen);
+		hdr->srcoffset = 0;
+	}
+
+	memcpy(hdr->srcdata + hdr->srcoffset + hdr->srclen, f->data, f->datalen);
+	hdr->srclen += f->datalen;
+	ztp->samples += f->samples;
+
+	return -1;
+}
+
+static struct ast_frame *zap_frameout(struct ast_translator_pvt *ztp)
+{
+	struct zt_transcode_header *hdr = ztp->hdr;
+	unsigned int x;
+
+	if (ztp->fake == 2) {
+		ztp->fake = 1;
+		ztp->f.frametype = AST_FRAME_VOICE;
+		ztp->f.subclass = 0;
+		ztp->f.samples = 240;
+		ztp->f.data = NULL;
+		ztp->f.offset = 0;
+		ztp->f.datalen = 0;
+		ztp->f.mallocd = 0;
+		ztp->samples = 0;
+	} else if (ztp->fake == 1) {
+		return NULL;
+	} else {
+		if (hdr->dstlen) {
+#ifdef DEBUG_TRANSCODE
+			ztp->totalms += hdr->dstsamples;
+			if ((ztp->totalms - ztp->lasttotalms) > 8000) {
+				ast_verbose("Whee %p, %d (%d to %d)\n", ztp, hdr->dstlen, ztp->lasttotalms, ztp->totalms);
+				ztp->lasttotalms = ztp->totalms;
+			}
+#endif
+			ztp->f.frametype = AST_FRAME_VOICE;
+			ztp->f.subclass = hdr->dstfmt;
+			ztp->f.samples = hdr->dstsamples;
+			ztp->f.data = hdr->dstdata + hdr->dstoffset;
+			ztp->f.offset = hdr->dstoffset;
+			ztp->f.datalen = hdr->dstlen;
+			ztp->f.mallocd = 0;
+			ztp->samples -= ztp->f.samples;
+			hdr->dstlen = 0;
+			
+		} else {
+			if (hdr->srclen) {
+				hdr->dstoffset = AST_FRIENDLY_OFFSET;
+				x = ZT_TCOP_TRANSCODE;
+				if (ioctl(ztp->fd, ZT_TRANSCODE_OP, &x))
+					ast_log(LOG_WARNING, "Failed to transcode: %s\n", strerror(errno));
+			}
+			return NULL;
+		}
+	}
+
+	return &ztp->f;
+}
+
+static void zap_destroy(struct ast_translator_pvt *ztp)
+{
+	unsigned int x;
+
+	x = ZT_TCOP_RELEASE;
+	if (ioctl(ztp->fd, ZT_TRANSCODE_OP, &x))
+		ast_log(LOG_WARNING, "Failed to release transcoder channel: %s\n", strerror(errno));
+				
+	munmap(ztp->hdr, sizeof(*ztp->hdr));
+	if(ztp->inuse) {
+		ast_mutex_lock(&channelcount);
+		localusecnt--;
+		if(ztp->dstfmt == 8 || ztp->dstfmt == 0)
+			complexinuse--;
+		else
+			simpleinuse--;
+		ast_mutex_unlock(&channelcount);
+	}
+	close(ztp->fd);
+}
+
+static struct ast_translator_pvt *zap_new_alawtog723(void)
+{
+	/* Request translation through zap if possible */
+	int fd;
+	unsigned int x = ZT_TCOP_RESET;
+	struct ast_translator_pvt *ztp;
+	struct zt_transcode_header *hdr;
+	int flags;
+	
+	ztp = calloc(1,sizeof(struct ast_translator_pvt));
+	if(!ztp) {
+		ast_log(LOG_ERROR, "Could not allocate ztp structure.\n");
+		return NULL;
+	}
+	ztp->dstfmt = 0;
+	ztp->srcfmt = 3;
+
+	if ((fd = open("/dev/zap/transcode", O_RDWR)) < 0)
+		return NULL;
+	flags = fcntl(fd, F_GETFL);
+	if (flags > - 1) {
+		if (fcntl(fd, F_SETFL, flags | O_NONBLOCK))
+			ast_log(LOG_WARNING, "Could not set non-block mode!\n");
+	}
+	
+
+	if ((hdr = mmap(NULL, sizeof(*hdr), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0)) == MAP_FAILED) {
+		ast_log(LOG_ERROR, "Memory Map failed for transcoding (%s)\n", strerror(errno));
+		close(fd);
+
+		return NULL;
+	}
+
+	if (hdr->magic != ZT_TRANSCODE_MAGIC) {
+		ast_log(LOG_ERROR, "Transcoder header (%08x) wasn't magic.  Abandoning\n", hdr->magic);
+		munmap(hdr, sizeof(*hdr));
+		close(fd);
+
+		return NULL;
+	}
+	
+	hdr->srcfmt = (1 << ztp->srcfmt);
+	hdr->dstfmt = (1 << ztp->dstfmt);
+	if (ioctl(fd, ZT_TRANSCODE_OP, &x)) {
+		ast_log(LOG_ERROR, "Unable to attach transcoder: %s\n", strerror(errno));
+		munmap(hdr, sizeof(*hdr));
+		close(fd);
+
+		return NULL;
+	}
+
+	ztp->fd = fd;
+	ztp->hdr = hdr;
+
+	return (struct ast_translator_pvt *) ztp;
+}
+
+static struct ast_translator_pvt *zap_new_ulawtog723(void)
+{
+	/* Request translation through zap if possible */
+	int fd;
+	unsigned int x = ZT_TCOP_RESET;
+	struct ast_translator_pvt *ztp;
+	struct zt_transcode_header *hdr;
+	int flags;
+	
+	ztp = calloc(1,sizeof(struct ast_translator_pvt));
+	if(!ztp) {
+		ast_log(LOG_ERROR, "Could not allocate ztp structure.\n");
+		return NULL;
+	}
+	ztp->dstfmt = 0;
+	ztp->srcfmt = 2;
+
+	if ((fd = open("/dev/zap/transcode", O_RDWR)) < 0)
+		return NULL;
+	flags = fcntl(fd, F_GETFL);
+	if (flags > - 1) {
+		if (fcntl(fd, F_SETFL, flags | O_NONBLOCK))
+			ast_log(LOG_WARNING, "Could not set non-block mode!\n");
+	}
+	
+
+	if ((hdr = mmap(NULL, sizeof(*hdr), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0)) == MAP_FAILED) {
+		ast_log(LOG_ERROR, "Memory Map failed for transcoding (%s)\n", strerror(errno));
+		close(fd);
+
+		return NULL;
+	}
+
+	if (hdr->magic != ZT_TRANSCODE_MAGIC) {
+		ast_log(LOG_ERROR, "Transcoder header (%08x) wasn't magic.  Abandoning\n", hdr->magic);
+		munmap(hdr, sizeof(*hdr));
+		close(fd);
+
+		return NULL;
+	}
+	
+	hdr->srcfmt = (1 << ztp->srcfmt);
+	hdr->dstfmt = (1 << ztp->dstfmt);
+	if (ioctl(fd, ZT_TRANSCODE_OP, &x)) {
+		ast_log(LOG_ERROR, "Unable to attach transcoder: %s\n", strerror(errno));
+		munmap(hdr, sizeof(*hdr));
+		close(fd);
+
+		return NULL;
+	}
+
+	ztp->fd = fd;
+	ztp->hdr = hdr;
+
+	return (struct ast_translator_pvt *) ztp;
+}
+
+static struct ast_translator_pvt *zap_new_g723toalaw(void)
+{
+	/* Request translation through zap if possible */
+	int fd;
+	unsigned int x = ZT_TCOP_RESET;
+	struct ast_translator_pvt *ztp;
+	struct zt_transcode_header *hdr;
+	int flags;
+	
+	ztp = calloc(1,sizeof(struct ast_translator_pvt));
+	if(!ztp) {
+		ast_log(LOG_ERROR, "Could not allocate ztp structure.\n");
+		return NULL;
+	}
+	ztp->dstfmt = 3;
+	ztp->srcfmt = 0;
+
+	if ((fd = open("/dev/zap/transcode", O_RDWR)) < 0)
+		return NULL;
+	flags = fcntl(fd, F_GETFL);
+	if (flags > - 1) {
+		if (fcntl(fd, F_SETFL, flags | O_NONBLOCK))
+			ast_log(LOG_WARNING, "Could not set non-block mode!\n");
+	}
+	
+
+	if ((hdr = mmap(NULL, sizeof(*hdr), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0)) == MAP_FAILED) {
+		ast_log(LOG_ERROR, "Memory Map failed for transcoding (%s)\n", strerror(errno));
+		close(fd);
+
+		return NULL;
+	}
+
+	if (hdr->magic != ZT_TRANSCODE_MAGIC) {
+		ast_log(LOG_ERROR, "Transcoder header (%08x) wasn't magic.  Abandoning\n", hdr->magic);
+		munmap(hdr, sizeof(*hdr));
+		close(fd);
+
+		return NULL;
+	}
+	
+	hdr->srcfmt = (1 << ztp->srcfmt);
+	hdr->dstfmt = (1 << ztp->dstfmt);
+	if (ioctl(fd, ZT_TRANSCODE_OP, &x)) {
+		ast_log(LOG_ERROR, "Unable to attach transcoder: %s\n", strerror(errno));
+		munmap(hdr, sizeof(*hdr));
+		close(fd);
+
+		return NULL;
+	}
+
+	ztp->fd = fd;
+	ztp->hdr = hdr;
+
+	return (struct ast_translator_pvt *) ztp;
+}
+
+static struct ast_translator_pvt *zap_new_g723toulaw(void)
+{
+	/* Request translation through zap if possible */
+	int fd;
+	unsigned int x = ZT_TCOP_RESET;
+	struct ast_translator_pvt *ztp;
+	struct zt_transcode_header *hdr;
+	int flags;
+	
+	ztp = calloc(1,sizeof(struct ast_translator_pvt));
+	if(!ztp) {
+		ast_log(LOG_ERROR, "Could not allocate ztp structure.\n");
+		return NULL;
+	}
+	ztp->dstfmt = 2;
+	ztp->srcfmt = 0;
+
+	if ((fd = open("/dev/zap/transcode", O_RDWR)) < 0)
+		return NULL;
+	flags = fcntl(fd, F_GETFL);
+	if (flags > - 1) {
+		if (fcntl(fd, F_SETFL, flags | O_NONBLOCK))
+			ast_log(LOG_WARNING, "Could not set non-block mode!\n");
+	}
+	
+
+	if ((hdr = mmap(NULL, sizeof(*hdr), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0)) == MAP_FAILED) {
+		ast_log(LOG_ERROR, "Memory Map failed for transcoding (%s)\n", strerror(errno));
+		close(fd);
+
+		return NULL;
+	}
+
+	if (hdr->magic != ZT_TRANSCODE_MAGIC) {
+		ast_log(LOG_ERROR, "Transcoder header (%08x) wasn't magic.  Abandoning\n", hdr->magic);
+		munmap(hdr, sizeof(*hdr));
+		close(fd);
+
+		return NULL;
+	}
+	
+	hdr->srcfmt = (1 << ztp->srcfmt);
+	hdr->dstfmt = (1 << ztp->dstfmt);
+	if (ioctl(fd, ZT_TRANSCODE_OP, &x)) {
+		ast_log(LOG_ERROR, "Unable to attach transcoder: %s\n", strerror(errno));
+		munmap(hdr, sizeof(*hdr));
+		close(fd);
+
+		return NULL;
+	}
+
+	ztp->fd = fd;
+	ztp->hdr = hdr;
+
+	return (struct ast_translator_pvt *) ztp;
+}
+
+static struct ast_translator_pvt *zap_new_alawtog729(void)
+{
+	/* Request translation through zap if possible */
+	int fd;
+	unsigned int x = ZT_TCOP_RESET;
+	struct ast_translator_pvt *ztp;
+	struct zt_transcode_header *hdr;
+	int flags;
+	
+	ztp = calloc(1,sizeof(struct ast_translator_pvt));
+	if(!ztp) {
+		ast_log(LOG_ERROR, "Could not allocate ztp structure.\n");
+		return NULL;
+	}
+	ztp->dstfmt = 8;
+	ztp->srcfmt = 3;
+
+	if ((fd = open("/dev/zap/transcode", O_RDWR)) < 0)
+		return NULL;
+	flags = fcntl(fd, F_GETFL);
+	if (flags > - 1) {
+		if (fcntl(fd, F_SETFL, flags | O_NONBLOCK))
+			ast_log(LOG_WARNING, "Could not set non-block mode!\n");
+	}
+	
+
+	if ((hdr = mmap(NULL, sizeof(*hdr), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0)) == MAP_FAILED) {
+		ast_log(LOG_ERROR, "Memory Map failed for transcoding (%s)\n", strerror(errno));
+		close(fd);
+
+		return NULL;
+	}
+
+	if (hdr->magic != ZT_TRANSCODE_MAGIC) {
+		ast_log(LOG_ERROR, "Transcoder header (%08x) wasn't magic.  Abandoning\n", hdr->magic);
+		munmap(hdr, sizeof(*hdr));
+		close(fd);
+
+		return NULL;
+	}
+	
+	hdr->srcfmt = (1 << ztp->srcfmt);
+	hdr->dstfmt = (1 << ztp->dstfmt);
+	if (ioctl(fd, ZT_TRANSCODE_OP, &x)) {
+		ast_log(LOG_ERROR, "Unable to attach transcoder: %s\n", strerror(errno));
+		munmap(hdr, sizeof(*hdr));
+		close(fd);
+
+		return NULL;
+	}
+
+	ztp->fd = fd;
+	ztp->hdr = hdr;
+
+	return (struct ast_translator_pvt *) ztp;
+}
+
+static struct ast_translator_pvt *zap_new_ulawtog729(void)
+{
+	/* Request translation through zap if possible */
+	int fd;
+	unsigned int x = ZT_TCOP_RESET;
+	struct ast_translator_pvt *ztp;
+	struct zt_transcode_header *hdr;
+	int flags;
+	
+	ztp = calloc(1,sizeof(struct ast_translator_pvt));
+	if(!ztp) {
+		ast_log(LOG_ERROR, "Could not allocate ztp structure.\n");
+		return NULL;
+	}
+	ztp->dstfmt = 8;
+	ztp->srcfmt = 2;
+
+	if ((fd = open("/dev/zap/transcode", O_RDWR)) < 0)
+		return NULL;
+	flags = fcntl(fd, F_GETFL);
+	if (flags > - 1) {
+		if (fcntl(fd, F_SETFL, flags | O_NONBLOCK))
+			ast_log(LOG_WARNING, "Could not set non-block mode!\n");
+	}
+	
+
+	if ((hdr = mmap(NULL, sizeof(*hdr), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0)) == MAP_FAILED) {
+		ast_log(LOG_ERROR, "Memory Map failed for transcoding (%s)\n", strerror(errno));
+		close(fd);
+
+		return NULL;
+	}
+
+	if (hdr->magic != ZT_TRANSCODE_MAGIC) {
+		ast_log(LOG_ERROR, "Transcoder header (%08x) wasn't magic.  Abandoning\n", hdr->magic);
+		munmap(hdr, sizeof(*hdr));
+		close(fd);
+
+		return NULL;
+	}
+	
+	hdr->srcfmt = (1 << ztp->srcfmt);
+	hdr->dstfmt = (1 << ztp->dstfmt);
+	if (ioctl(fd, ZT_TRANSCODE_OP, &x)) {
+		ast_log(LOG_ERROR, "Unable to attach transcoder: %s\n", strerror(errno));
+		munmap(hdr, sizeof(*hdr));
+		close(fd);
+
+		return NULL;
+	}
+
+	ztp->fd = fd;
+	ztp->hdr = hdr;
+
+	return (struct ast_translator_pvt *) ztp;
+}
+
+static struct ast_translator_pvt *zap_new_g729toalaw(void)
+{
+	/* Request translation through zap if possible */
+	int fd;
+	unsigned int x = ZT_TCOP_RESET;
+	struct ast_translator_pvt *ztp;
+	struct zt_transcode_header *hdr;
+	int flags;
+	
+	ztp = calloc(1,sizeof(struct ast_translator_pvt));
+	if(!ztp) {
+		ast_log(LOG_ERROR, "Could not allocate ztp structure.\n");
+		return NULL;
+	}
+	ztp->dstfmt = 3;
+	ztp->srcfmt = 8;
+
+	if ((fd = open("/dev/zap/transcode", O_RDWR)) < 0)
+		return NULL;
+	flags = fcntl(fd, F_GETFL);
+	if (flags > - 1) {
+		if (fcntl(fd, F_SETFL, flags | O_NONBLOCK))
+			ast_log(LOG_WARNING, "Could not set non-block mode!\n");
+	}
+	
+
+	if ((hdr = mmap(NULL, sizeof(*hdr), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0)) == MAP_FAILED) {
+		ast_log(LOG_ERROR, "Memory Map failed for transcoding (%s)\n", strerror(errno));
+		close(fd);
+
+		return NULL;
+	}
+
+	if (hdr->magic != ZT_TRANSCODE_MAGIC) {
+		ast_log(LOG_ERROR, "Transcoder header (%08x) wasn't magic.  Abandoning\n", hdr->magic);
+		munmap(hdr, sizeof(*hdr));
+		close(fd);
+
+		return NULL;
+	}
+	
+	hdr->srcfmt = (1 << ztp->srcfmt);
+	hdr->dstfmt = (1 << ztp->dstfmt);
+	if (ioctl(fd, ZT_TRANSCODE_OP, &x)) {
+		ast_log(LOG_ERROR, "Unable to attach transcoder: %s\n", strerror(errno));
+		munmap(hdr, sizeof(*hdr));
+		close(fd);
+
+		return NULL;
+	}
+
+	ztp->fd = fd;
+	ztp->hdr = hdr;
+
+	return (struct ast_translator_pvt *) ztp;
+}
+
+static struct ast_translator_pvt *zap_new_g729toulaw(void)
+{
+	/* Request translation through zap if possible */
+	int fd;
+	unsigned int x = ZT_TCOP_RESET;
+	struct ast_translator_pvt *ztp;
+	struct zt_transcode_header *hdr;
+	int flags;
+	
+	ztp = calloc(1,sizeof(struct ast_translator_pvt));
+	if(!ztp) {
+		ast_log(LOG_ERROR, "Could not allocate ztp structure.\n");
+		return NULL;
+	}
+	ztp->dstfmt = 2;
+	ztp->srcfmt = 8;
+
+	if ((fd = open("/dev/zap/transcode", O_RDWR)) < 0)
+		return NULL;
+	flags = fcntl(fd, F_GETFL);
+	if (flags > - 1) {
+		if (fcntl(fd, F_SETFL, flags | O_NONBLOCK))
+			ast_log(LOG_WARNING, "Could not set non-block mode!\n");
+	}
+	
+
+	if ((hdr = mmap(NULL, sizeof(*hdr), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0)) == MAP_FAILED) {
+		ast_log(LOG_ERROR, "Memory Map failed for transcoding (%s)\n", strerror(errno));
+		close(fd);
+
+		return NULL;
+	}
+
+	if (hdr->magic != ZT_TRANSCODE_MAGIC) {
+		ast_log(LOG_ERROR, "Transcoder header (%08x) wasn't magic.  Abandoning\n", hdr->magic);
+		munmap(hdr, sizeof(*hdr));
+		close(fd);
+
+		return NULL;
+	}
+	
+	hdr->srcfmt = (1 << ztp->srcfmt);
+	hdr->dstfmt = (1 << ztp->dstfmt);
+	if (ioctl(fd, ZT_TRANSCODE_OP, &x)) {
+		ast_log(LOG_ERROR, "Unable to attach transcoder: %s\n", strerror(errno));
+		munmap(hdr, sizeof(*hdr));
+		close(fd);
+
+		return NULL;
+	}
+
+	ztp->fd = fd;
+	ztp->hdr = hdr;
+
+	return (struct ast_translator_pvt *) ztp;
+}
+
+static struct ast_frame *fakesrc_sample(void)
+{
+	/* Don't bother really trying to test hardware ones. */
+	static struct ast_frame f = {
+		.frametype = AST_FRAME_VOICE,
+		.samples = 240,
+		.src = __PRETTY_FUNCTION__
+	};
+
+	return &f;
+}
+
+static int register_translator(int dst, int src)
+{
+	struct translator *zt;
+	int res;
+
+	if (!(zt = calloc(1, sizeof(*zt)))) {
+		ast_log(LOG_ERROR, "Could not allocate translator\n");
+		return -1;
+	}
+	if (!((cardsmode == 1 && (dst == 8 || src == 8)) || (cardsmode == 2 && (dst == 0 || src == 0)) || (cardsmode == 0)))
+		return -1;
+	snprintf((char *) (zt->t.name), sizeof(zt->t.name), "zap%sto%s", 
+		 ast_getformatname((1 << src)), ast_getformatname((1 << dst)));
+
+	if(src == 8 && dst == 2) /* G.729 to Ulaw */
+		zt->t.newpvt = zap_new_g729toulaw;
+	else if(src == 8 && dst == 3) /* G.729 to Alaw */
+		zt->t.newpvt = zap_new_g729toalaw;
+	else if(src == 2 && dst == 8) /* Ulaw to G.729 */
+		zt->t.newpvt = zap_new_ulawtog729;
+	else if(src == 3 && dst == 8) /* Alaw to G.729 */
+		zt->t.newpvt = zap_new_alawtog729;
+	else if(src == 0 && dst == 2) /* G.723 to Ulaw */
+		zt->t.newpvt = zap_new_g723toulaw;
+	else if(src == 0 && dst == 3) /* G.723 to Alaw */
+		zt->t.newpvt = zap_new_g723toalaw;
+	else if(src == 2 && dst == 0) /* Ulaw to G.723 */
+		zt->t.newpvt = zap_new_ulawtog723;
+	else if(src == 3 && dst == 0) /* Alaw to G.723 */
+		zt->t.newpvt = zap_new_alawtog723;
+
+	zt->t.frameout = zap_frameout;
+	zt->t.destroy = zap_destroy;
+	zt->t.sample = fakesrc_sample;
+	zt->t.framein = zap_framein;
+	zt->t.srcfmt = (1 << src);
+	zt->t.dstfmt = (1 << dst);
+	if ((res = ast_register_translator(&zt->t))) {
+		free(zt);
+		return -1;
+	}
+
+	AST_LIST_LOCK(&zap_translators);
+	AST_LIST_INSERT_HEAD(&zap_translators, zt, entry);
+	AST_LIST_UNLOCK(&zap_translators);
+
+	global_format_map.map[dst][src] = 1;
+
+	return res;
+}
+
+static void drop_translator(int dst, int src)
+{
+	struct translator *cur;
+
+	AST_LIST_LOCK(&zap_translators);
+	AST_LIST_TRAVERSE_SAFE_BEGIN(&zap_translators, cur, entry) {
+		if (cur->t.srcfmt != src)
+			continue;
+
+		if (cur->t.dstfmt != dst)
+			continue;
+
+		AST_LIST_REMOVE_CURRENT(&zap_translators, entry);
+		ast_unregister_translator(&cur->t);
+		free(cur);
+		global_format_map.map[dst][src] = 0;
+		break;
+	}
+	AST_LIST_TRAVERSE_SAFE_END;
+	AST_LIST_UNLOCK(&zap_translators);
+}
+
+static void unregister_translators(void)
+{
+	struct translator *cur;
+
+	AST_LIST_LOCK(&zap_translators);
+	while ((cur = AST_LIST_REMOVE_HEAD(&zap_translators, entry))) {
+		ast_unregister_translator(&cur->t);
+		free(cur);
+	}
+	AST_LIST_UNLOCK(&zap_translators);
+}
+
+static void parse_config(void)
+{
+	struct ast_variable *var;
+	struct ast_config *cfg = ast_config_load("codecs.conf");
+	cardsmode = 0;
+
+	if (!cfg)
+		return;
+
+	for (var = ast_variable_browse(cfg, "plc"); var; var = var->next) {
+		if (!strcasecmp(var->name, "genericplc")) {
+			global_useplc = ast_true(var->value);
+			if (option_verbose > 2)
+				ast_verbose(VERBOSE_PREFIX_3 "codec_zap: %susing generic PLC\n", global_useplc ? "" : "not ");
+		}
+	}
+	for (var = ast_variable_browse(cfg, "transcoder_card"); var; var = var->next) {
+		if (!strcasecmp(var->name, "mode")) {
+			if(strstr(var->value, "g729"))
+				cardsmode = 1;
+			else if(strstr(var->value, "g723"))
+				cardsmode = 2;
+			else if(strstr(var->value, "mixed"))
+				cardsmode = 0;
+		}
+	}
+
+	ast_config_destroy(cfg);
+}
+
+static int build_translators(struct format_map *map, unsigned int dstfmts, unsigned int srcfmts)
+{
+	unsigned int src, dst;
+
+	for (src = 0; src < 32; src++) {
+		for (dst = 0; dst < 32; dst++) {
+			if (!(srcfmts & (1<< src)))
+				continue;
+
+			if (!(dstfmts & (1 << dst)))
+				continue;
+
+			if (global_format_map.map[dst][src])
+				continue;
+
+			if (!register_translator(dst, src))
+				map->map[dst][src] = 1;
+			else
+				return 0;
+		}
+	}
+	return 1;
+}
+
+static int find_transcoders(void)
+{
+	struct zt_transcode_info info = { 0, };
+	struct format_map map = { { { 0 } } };
+	int fd, res;
+	unsigned int x, y;
+
+	info.op = ZT_TCOP_GETINFO;
+	if ((fd = open("/dev/zap/transcode", O_RDWR)) < 0) {
+		ast_log(LOG_NOTICE, "No Zaptel transcoder support!\n");
+		return 0;
+	}
+	for (info.tcnum = 0; !(res = ioctl(fd, ZT_TRANSCODE_OP, &info)); info.tcnum++) {
+		if (option_verbose > 1)
+			ast_verbose(VERBOSE_PREFIX_2 "Found transcoder '%s'.\n", info.name);
+
+		if(build_translators(&map, info.dstfmts, info.srcfmts)) {
+			ast_mutex_lock(&channelcount);
+			totalchannels += info.numchannels;
+			ast_mutex_unlock(&channelcount);
+		}
+	}
+	close(fd);
+
+	if (!info.tcnum && (option_verbose > 1))
+		ast_verbose(VERBOSE_PREFIX_2 "No hardware transcoders found.\n");
+
+	for (x = 0; x < 32; x++) {
+		for (y = 0; y < 32; y++) {
+			if (!map.map[x][y] && global_format_map.map[x][y])
+				drop_translator(x, y);
+		}
+	}
+	ast_mutex_lock(&channelcount);
+	totalchannels = totalchannels/2;
+	ast_mutex_unlock(&channelcount);
+	return 0;
+}
+
+int reload(void)
+{
+	parse_config();
+	find_transcoders();
+
+	return 0;
+}
+
+int unload_module(void)
+{
+	if(!localusecnt)
+		return -1;
+	unregister_translators();
+	ast_cli_unregister_multiple(transcoder_cli, sizeof(transcoder_cli) / sizeof(struct ast_cli_entry));
+	return 0;
+}
+
+int load_module(void)
+{
+	ast_mutex_init(&channelcount);
+	parse_config();
+
+	find_transcoders();
+	ast_cli_register_multiple(transcoder_cli, sizeof(transcoder_cli) / sizeof(struct ast_cli_entry));
+	return 0;
+}
+
+char *description(void)
+{
+	return tdesc;
+}
+
+int usecount(void)
+{
+	int res;
+	STANDARD_USECOUNT(res);
+	return res;
+}
+
+char *key()
+{
+	return ASTERISK_GPL_KEY;
+}