diff options
author | jpeeler <jpeeler@f38db490-d61c-443f-a65b-d21fe96a405b> | 2008-06-12 19:08:20 +0000 |
---|---|---|
committer | jpeeler <jpeeler@f38db490-d61c-443f-a65b-d21fe96a405b> | 2008-06-12 19:08:20 +0000 |
commit | f84b02a71d0968338c22758b24cc14e15e3864a4 (patch) | |
tree | 464a2032e05934a867493f45e5a2605929fceb8a /codecs/codec_dahdi.c | |
parent | ac54a25ad7440165f775131b2859ab56aa3c5a92 (diff) |
Adds DAHDI support alongside Zaptel. DAHDI usage favored, but all Zap stuff should continue working. Release announcement to follow.
git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.4@122314 f38db490-d61c-443f-a65b-d21fe96a405b
Diffstat (limited to 'codecs/codec_dahdi.c')
-rw-r--r-- | codecs/codec_dahdi.c | 513 |
1 files changed, 513 insertions, 0 deletions
diff --git a/codecs/codec_dahdi.c b/codecs/codec_dahdi.c new file mode 100644 index 000000000..1223c9c77 --- /dev/null +++ b/codecs/codec_dahdi.c @@ -0,0 +1,513 @@ +/* + * 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>dahdi_transcode</depend> + <depend>dahdi</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 "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" + +#include "asterisk/dahdi_compat.h" + +#define BUFFER_SAMPLES 8000 + +static unsigned int global_useplc = 0; + +static struct channel_usage { + int total; + int encoders; + int decoders; +} channels; + +static char show_transcoder_usage[] = +"Usage: show transcoder\n" +" Displays channel utilization of Zaptel transcoder(s).\n"; + +static char transcoder_show_usage[] = +"Usage: transcoder show\n" +" Displays channel utilization of Zaptel transcoder(s).\n"; + +static int transcoder_show(int fd, int argc, char **argv); + +static struct ast_cli_entry cli_deprecated[] = { + { { "show", "transcoder", NULL }, + transcoder_show, + "Display Zaptel transcoder utilization.", + show_transcoder_usage} +}; + +static struct ast_cli_entry cli[] = { + { { "transcoder", "show", NULL }, + transcoder_show, + "Display Zaptel transcoder utilization.", + transcoder_show_usage, NULL, + &cli_deprecated[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; + unsigned int g729b_warning:1; +#ifdef DEBUG_TRANSCODE + int totalms; + int lasttotalms; +#endif + DAHDI_TRANSCODE_HEADER *hdr; +}; + +static int transcoder_show(int fd, int argc, char **argv) +{ + struct channel_usage copy; + + copy = channels; + + if (copy.total == 0) + ast_cli(fd, "No Zaptel transcoders found.\n"); + else + ast_cli(fd, "%d/%d encoders/decoders of %d channels are in use.\n", copy.encoders, copy.decoders, copy.total); + + return RESULT_SUCCESS; +} + +static int zap_framein(struct ast_trans_pvt *pvt, struct ast_frame *f) +{ + struct pvt *ztp = pvt->pvt; + DAHDI_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 we get handed a G.729 frame that is not a multiple of + 10 bytes (10 milliseconds), then it has a CNG frame and + we need to avoid sending that to the transcoder + */ + if ((f->subclass == AST_FORMAT_G729A) && ((f->datalen % 10) != 0)) { + if (!ztp->g729b_warning) { + ast_log(LOG_WARNING, "G.729B CNG frame received but is not supported; dropping.\n"); + ztp->g729b_warning = 1; + } + f->datalen -= f->datalen % 10; + f->samples = f->datalen * 8; + } + + 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; + pvt->samples += f->samples; + + return -1; +} + +static struct ast_frame *zap_frameout(struct ast_trans_pvt *pvt) +{ + struct pvt *ztp = pvt->pvt; + DAHDI_TRANSCODE_HEADER *hdr = ztp->hdr; + unsigned int x; + + if (ztp->fake == 2) { + ztp->fake = 1; + pvt->f.frametype = AST_FRAME_VOICE; + pvt->f.subclass = 0; + pvt->f.samples = 160; + pvt->f.data = NULL; + pvt->f.offset = 0; + pvt->f.datalen = 0; + pvt->f.mallocd = 0; + ast_set_flag(&pvt->f, AST_FRFLAG_FROM_TRANSLATOR); + pvt->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) { + printf("Whee %p, %d (%d to %d)\n", ztp, hdr->dstlen, ztp->lasttotalms, ztp->totalms); + ztp->lasttotalms = ztp->totalms; + } +#endif + pvt->f.frametype = AST_FRAME_VOICE; + pvt->f.subclass = hdr->dstfmt; + pvt->f.samples = hdr->dstsamples; + pvt->f.data = hdr->dstdata + hdr->dstoffset; + pvt->f.offset = hdr->dstoffset; + pvt->f.datalen = hdr->dstlen; + pvt->f.mallocd = 0; + ast_set_flag(&pvt->f, AST_FRFLAG_FROM_TRANSLATOR); + pvt->samples -= pvt->f.samples; + hdr->dstlen = 0; + + } else { + if (hdr->srclen) { + hdr->dstoffset = AST_FRIENDLY_OFFSET; + x = DAHDI_TCOP_TRANSCODE; + if (ioctl(ztp->fd, DAHDI_TRANSCODE_OP, &x)) + ast_log(LOG_WARNING, "Failed to transcode: %s\n", strerror(errno)); + } + return NULL; + } + } + + return &pvt->f; +} + +static void zap_destroy(struct ast_trans_pvt *pvt) +{ + struct pvt *ztp = pvt->pvt; + unsigned int x; + + x = DAHDI_TCOP_RELEASE; + if (ioctl(ztp->fd, DAHDI_TRANSCODE_OP, &x)) + ast_log(LOG_WARNING, "Failed to release transcoder channel: %s\n", strerror(errno)); + + switch (ztp->hdr->dstfmt) { + case AST_FORMAT_G729A: + case AST_FORMAT_G723_1: + ast_atomic_fetchadd_int(&channels.encoders, -1); + break; + default: + ast_atomic_fetchadd_int(&channels.decoders, -1); + break; + } + + munmap(ztp->hdr, sizeof(*ztp->hdr)); + close(ztp->fd); +} + +static int zap_translate(struct ast_trans_pvt *pvt, int dest, int source) +{ + /* Request translation through zap if possible */ + int fd; + unsigned int x = DAHDI_TCOP_ALLOCATE; + struct pvt *ztp = pvt->pvt; + DAHDI_TRANSCODE_HEADER *hdr; + int flags; + + if ((fd = open("/dev/zap/transcode", O_RDWR)) < 0) + return -1; + 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 -1; + } + + if (hdr->magic != DAHDI_TRANSCODE_MAGIC) { + ast_log(LOG_ERROR, "Transcoder header (%08x) wasn't magic. Abandoning\n", hdr->magic); + munmap(hdr, sizeof(*hdr)); + close(fd); + + return -1; + } + + hdr->srcfmt = (1 << source); + hdr->dstfmt = (1 << dest); + if (ioctl(fd, DAHDI_TRANSCODE_OP, &x)) { + ast_log(LOG_ERROR, "Unable to attach transcoder: %s\n", strerror(errno)); + munmap(hdr, sizeof(*hdr)); + close(fd); + + return -1; + } + + ztp = pvt->pvt; + ztp->fd = fd; + ztp->hdr = hdr; + + switch (hdr->dstfmt) { + case AST_FORMAT_G729A: + case AST_FORMAT_G723_1: + ast_atomic_fetchadd_int(&channels.encoders, +1); + break; + default: + ast_atomic_fetchadd_int(&channels.decoders, +1); + break; + } + + return 0; +} + +static int 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) +{ + 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))) { + 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(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; + } + } +} + +static int find_transcoders(void) +{ + DAHDI_TRANSCODE_INFO info = { 0, }; + struct format_map map = { { { 0 } } }; + int fd, res; + unsigned int x, y; + + if ((fd = open("/dev/zap/transcode", O_RDWR)) < 0) { + ast_verbose(VERBOSE_PREFIX_2 "No hardware transcoders found.\n"); + return 0; + } + + info.op = DAHDI_TCOP_GETINFO; + for (info.tcnum = 0; !(res = ioctl(fd, DAHDI_TRANSCODE_OP, &info)); info.tcnum++) { + if (option_verbose > 1) + ast_verbose(VERBOSE_PREFIX_2 "Found transcoder '%s'.\n", info.name); + build_translators(&map, info.dstfmts, info.srcfmts); + ast_atomic_fetchadd_int(&channels.total, info.numchannels / 2); + } + + 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) +{ + struct translator *cur; + + parse_config(); + + 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) +{ + ast_cli_unregister_multiple(cli, sizeof(cli) / sizeof(cli[0])); + unregister_translators(); + + return 0; +} + +static int load_module(void) +{ + parse_config(); + find_transcoders(); + ast_cli_register_multiple(cli, sizeof(cli) / sizeof(cli[0])); + + return 0; +} + +AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "Generic Zaptel Transcoder Codec Translator", + .load = load_module, + .unload = unload_module, + .reload = reload, + ); |