diff options
author | kpfleming <kpfleming@f38db490-d61c-443f-a65b-d21fe96a405b> | 2006-06-23 16:33:17 +0000 |
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committer | kpfleming <kpfleming@f38db490-d61c-443f-a65b-d21fe96a405b> | 2006-06-23 16:33:17 +0000 |
commit | 782273ca463cc47bf63cb11429ce97e49fcac58f (patch) | |
tree | 03866ab9f8a8b0e1e74a4b7e2d674cb1fa176054 /codecs | |
parent | ec286687d7929cedc6edefdc2484ca0775d35b2b (diff) |
add support for Zaptel transcoders
git-svn-id: http://svn.digium.com/svn/asterisk/trunk@35745 f38db490-d61c-443f-a65b-d21fe96a405b
Diffstat (limited to 'codecs')
-rw-r--r-- | codecs/codec_zap.c | 406 |
1 files changed, 406 insertions, 0 deletions
diff --git a/codecs/codec_zap.c b/codecs/codec_zap.c new file mode 100644 index 000000000..cad97c475 --- /dev/null +++ b/codecs/codec_zap.c @@ -0,0 +1,406 @@ +/* + * 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 + */ + +/*** MODULEINFO + <depend>zaptel</depend> + ***/ + +#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 <linux/zaptel.h> + +#include "asterisk/lock.h" +#include "asterisk/translate.h" +#include "asterisk/config.h" +#include "asterisk/options.h" +#include "asterisk/module.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; + +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(translators, translator); + +struct pvt { + int fd; + int fake; + struct zt_transcode_header *hdr; + struct ast_frame f; +}; + +static int zap_framein(struct ast_trans_pvt *pvt, struct ast_frame *f) +{ + struct pvt *ztp = pvt->pvt; + struct zt_transcode_header *hdr = ztp->hdr; + + if (!f->subclass) { + /* Fake a return frame for calculation purposes */ + ztp->fake = 2; + pvt->samples = f->samples; + return 0; + } + + 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, f->data, f->datalen); + hdr->srclen += f->datalen; + pvt->samples += f->samples; + + return -1; +} + +static struct ast_frame *zap_frameout(struct ast_trans_pvt *pvt) +{ + struct pvt *ztp = pvt->pvt; + 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 = 160; + ztp->f.data = NULL; + ztp->f.offset = 0; + ztp->f.datalen = 0; + ztp->f.mallocd = 0; + pvt->samples = 0; + } else if (ztp->fake == 1) { + return NULL; + } else if (!hdr->srclen) { + return NULL; + } else { + hdr->dstoffset = 0; + hdr->dstlen = 0; + x = ZT_TCOP_TRANSCODE; + if (ioctl(ztp->fd, ZT_TRANSCODE_OP, &x)) + ast_log(LOG_WARNING, "Failed to transcode: %s\n", strerror(errno)); + if (!hdr->dstlen) + return NULL; + 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; + pvt->samples -= ztp->f.samples; + } + + return &ztp->f; +} + +static void zap_destroy(struct ast_trans_pvt *pvt) +{ + struct pvt *ztp = pvt->pvt; + + munmap(ztp->hdr, sizeof(*ztp->hdr)); + close(ztp->fd); +} + +static struct ast_trans_pvt *zap_translate(struct ast_trans_pvt *pvt, int dest, int source) +{ + /* Request translation through zap if possible */ + int fd; + unsigned int x = ZT_TCOP_RESET; + struct pvt *ztp = pvt->pvt; + struct zt_transcode_header *hdr; + + if ((fd = open("/dev/zap/transcode", O_RDWR)) < 0) + return NULL; + + 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 << source); + hdr->dstfmt = (1 << dest); + 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 = pvt->pvt; + ztp->fd = fd; + ztp->hdr = hdr; + + return pvt; +} + +static void *zap_new(struct ast_trans_pvt *pvt) +{ + return zap_translate(pvt, pvt->t->dstfmt, pvt->t->srcfmt); +} + +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 = 160, + .src = __PRETTY_FUNCTION__ + }; + + return &f; +} + +static int register_translator(int dst, int src, void *mod) +{ + struct translator *zt; + int res; + + if (!(zt = ast_calloc(1, sizeof(*zt)))) + return -1; + + snprintf((char *) (zt->t.name), sizeof(zt->t.name), "zap%sto%s", + ast_getformatname((1 << src)), ast_getformatname((1 << dst))); + zt->t.srcfmt = (1 << src); + zt->t.dstfmt = (1 << dst); + zt->t.newpvt = zap_new; + zt->t.framein = zap_framein; + zt->t.frameout = zap_frameout; + zt->t.destroy = zap_destroy; + zt->t.sample = fakesrc_sample; + zt->t.useplc = global_useplc; + zt->t.buf_size = BUFFER_SAMPLES * 2; + zt->t.desc_size = sizeof(struct pvt); + if ((res = ast_register_translator(&zt->t, mod))) { + free(zt); + return -1; + } + + AST_LIST_LOCK(&translators); + AST_LIST_INSERT_HEAD(&translators, zt, entry); + AST_LIST_UNLOCK(&translators); + + global_format_map.map[dst][src] = 1; + + return res; +} + +static void drop_translator(int dst, int src) +{ + struct translator *cur; + + AST_LIST_LOCK(&translators); + AST_LIST_TRAVERSE_SAFE_BEGIN(&translators, cur, entry) { + if (cur->t.srcfmt != src) + continue; + + if (cur->t.dstfmt != dst) + continue; + + AST_LIST_REMOVE_CURRENT(&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(&translators); +} + +static void unregister_translators(void) +{ + struct translator *cur; + + AST_LIST_LOCK(&translators); + while ((cur = AST_LIST_REMOVE_HEAD(&translators, entry))) { + ast_unregister_translator(&cur->t); + free(cur); + } + AST_LIST_UNLOCK(&translators); +} + +static void parse_config(void) +{ + struct ast_variable *var; + struct ast_config *cfg = ast_config_load("codecs.conf"); + + 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 "); + } + } + + ast_config_destroy(cfg); +} + +static void build_translators(void *mod, 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, mod)) + map->map[dst][src] = 1; + } + } +} + +static int find_transcoders(void *mod) +{ + 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); + build_translators(mod, &map, info.dstfmts, info.srcfmts); + } + 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); + } + } + + return 0; +} + +static int reload(void *mod) +{ + struct translator *cur; + + parse_config(); + find_transcoders(mod); + + AST_LIST_LOCK(&translators); + AST_LIST_TRAVERSE(&translators, cur, entry) + cur->t.useplc = global_useplc; + AST_LIST_UNLOCK(&translators); + + return 0; +} + +static int unload_module(void *mod) +{ + unregister_translators(); + + return 0; +} + +static int load_module(void *mod) +{ + parse_config(); + find_transcoders(mod); + + return 0; +} + +static const char *description(void) +{ + return "Generic Zaptel Transcoder Codec Translator"; +} + +static const char *key(void) +{ + return ASTERISK_GPL_KEY; +} + +STD_MOD(MOD_1, reload, NULL, NULL); |