diff options
Diffstat (limited to '1.4.23-rc4/codecs/codec_dahdi.c')
-rw-r--r-- | 1.4.23-rc4/codecs/codec_dahdi.c | 480 |
1 files changed, 480 insertions, 0 deletions
diff --git a/1.4.23-rc4/codecs/codec_dahdi.c b/1.4.23-rc4/codecs/codec_dahdi.c new file mode 100644 index 000000000..347fc8012 --- /dev/null +++ b/1.4.23-rc4/codecs/codec_dahdi.c @@ -0,0 +1,480 @@ +/* + * Asterisk -- An open source telephony toolkit. + * + * DAHDI native transcoding support + * + * Copyright (C) 1999 - 2008, 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 DAHDI 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 DAHDI transcoder(s).\n"; + +static char transcoder_show_usage[] = +"Usage: transcoder show\n" +" Displays channel utilization of DAHDI 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 DAHDI transcoder utilization.", + show_transcoder_usage} +}; + +static struct ast_cli_entry cli[] = { + { { "transcoder", "show", NULL }, + transcoder_show, + "Display DAHDI 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; + int samples; + struct dahdi_transcoder_formats fmts; +}; + +static int transcoder_show(int fd, int argc, char **argv) +{ + struct channel_usage copy; + + copy = channels; + + if (copy.total == 0) + ast_cli(fd, "No DAHDI 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) +{ + int res; + struct pvt *ztp = pvt->pvt; + + if (f->subclass) { + /* Give the frame to the hardware transcoder... */ + res = write(ztp->fd, f->data, f->datalen); + if (-1 == res) { + ast_log(LOG_ERROR, "Failed to write to transcoder: %s\n", strerror(errno)); + } + if (f->datalen != res) { + ast_log(LOG_ERROR, "Requested write of %d bytes, but only wrote %d bytes.\n", f->datalen, res); + } + res = -1; + pvt->samples += f->samples; + } else { + /* Fake a return frame for calculation purposes */ + ztp->fake = 2; + pvt->samples = f->samples; + res = 0; + } + return res; +} + +static struct ast_frame *zap_frameout(struct ast_trans_pvt *pvt) +{ + struct pvt *ztp = pvt->pvt; + + if (0 == ztp->fake) { + int res; + /* Let's check to see if there is a new frame for us.... */ + res = read(ztp->fd, pvt->outbuf + pvt->datalen, pvt->t->buf_size - pvt->datalen); + if (-1 == res) { + if (EWOULDBLOCK == errno) { + /* Nothing waiting... */ + return NULL; + } else { + ast_log(LOG_ERROR, "Failed to read from transcoder: %s\n", strerror(errno)); + return NULL; + } + } else { + pvt->f.samples = ztp->samples; + pvt->f.datalen = res; + pvt->datalen = 0; + pvt->f.frametype = AST_FRAME_VOICE; + pvt->f.subclass = 1 << (pvt->t->dstfmt); + pvt->f.mallocd = 0; + pvt->f.offset = AST_FRIENDLY_OFFSET; + pvt->f.src = pvt->t->name; + pvt->f.data = pvt->outbuf; + ast_set_flag(&pvt->f, AST_FRFLAG_FROM_TRANSLATOR); + + return &pvt->f; + } + + } else if (2 == ztp->fake) { + + 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; + + return &pvt->f; + + } else if (1 == ztp->fake) { + + return NULL; + + } + /* Shouldn't get here... */ + return NULL; +} + +static void zap_destroy(struct ast_trans_pvt *pvt) +{ + struct pvt *ztp = pvt->pvt; + + switch (ztp->fmts.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; + } + + close(ztp->fd); +} + +static int zap_translate(struct ast_trans_pvt *pvt, int dest, int source) +{ + /* Request translation through zap if possible */ + int fd; + struct pvt *ztp = pvt->pvt; + int flags; + + if ((fd = open(DAHDI_FILE_TRANSCODE, O_RDWR)) < 0) { + ast_log(LOG_ERROR, "Failed to open " DAHDI_FILE_TRANSCODE ": %s\n", strerror(errno)); + return -1; + } + + ztp->fmts.srcfmt = (1 << source); + ztp->fmts.dstfmt = (1 << dest); + + ast_log(LOG_VERBOSE, "Opening transcoder channel from %d to %d.\n", source, dest); + + if (ioctl(fd, DAHDI_TC_ALLOCATE, &ztp->fmts)) { + ast_log(LOG_ERROR, "Unable to attach to transcoder: %s\n", strerror(errno)); + close(fd); + + 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"); + } + + ztp->fd = fd; + + switch (ztp->fmts.dstfmt) { + case AST_FORMAT_G729A: + ztp->samples = 160; + break; + case AST_FORMAT_G723_1: + ztp->samples = 240; + break; + default: + ztp->samples = 160; + break; + }; + + switch (ztp->fmts.dstfmt) { + case AST_FORMAT_G729A: + ast_atomic_fetchadd_int(&channels.encoders, +1); + break; + 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) +{ + struct dahdi_transcoder_info info = { 0, }; + struct format_map map = { { { 0 } } }; + int fd, res; + unsigned int x, y; + + if ((fd = open(DAHDI_FILE_TRANSCODE, O_RDWR)) < 0) { + ast_log(LOG_ERROR, "Failed to open " DAHDI_FILE_TRANSCODE ": %s\n", strerror(errno)); + return 0; + } + + for (info.tcnum = 0; !(res = ioctl(fd, DAHDI_TC_GETINFO, &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 DAHDI Transcoder Codec Translator", + .load = load_module, + .unload = unload_module, + .reload = reload, + ); |