diff options
Diffstat (limited to '1.2-netsec/formats/format_ilbc.c')
-rw-r--r-- | 1.2-netsec/formats/format_ilbc.c | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/1.2-netsec/formats/format_ilbc.c b/1.2-netsec/formats/format_ilbc.c new file mode 100644 index 000000000..cbe017f66 --- /dev/null +++ b/1.2-netsec/formats/format_ilbc.c @@ -0,0 +1,259 @@ +/* + * Asterisk -- An open source telephony toolkit. + * + * Brian K. West <brian@bkw.org> + * + * Copyright (C) 1999 - 2005, Digium, Inc. + * + * Mark Spencer <markster@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 Save to raw, headerless iLBC data. + * \arg File name extension: ilbc + * \ingroup formats + */ + +#include <unistd.h> +#include <netinet/in.h> +#include <arpa/inet.h> +#include <stdlib.h> +#include <sys/time.h> +#include <stdio.h> +#include <errno.h> +#include <string.h> + +#include "asterisk.h" + +ASTERISK_FILE_VERSION(__FILE__, "$Revision$") + +#include "asterisk/lock.h" +#include "asterisk/channel.h" +#include "asterisk/file.h" +#include "asterisk/logger.h" +#include "asterisk/sched.h" +#include "asterisk/module.h" +#include "asterisk/endian.h" + +/* Some Ideas for this code came from makeg729e.c by Jeffrey Chilton */ + +/* Portions of the conversion code are by guido@sienanet.it */ + +struct ast_filestream { + void *reserved[AST_RESERVED_POINTERS]; + /* Believe it or not, we must decode/recode to account for the + weird MS format */ + /* This is what a filestream means to us */ + FILE *f; /* Descriptor */ + struct ast_frame fr; /* Frame information */ + char waste[AST_FRIENDLY_OFFSET]; /* Buffer for sending frames, etc */ + char empty; /* Empty character */ + unsigned char ilbc[50]; /* One Real iLBC Frame */ +}; + + +AST_MUTEX_DEFINE_STATIC(ilbc_lock); +static int glistcnt = 0; + +static char *name = "iLBC"; +static char *desc = "Raw iLBC data"; +static char *exts = "ilbc"; + +static struct ast_filestream *ilbc_open(FILE *f) +{ + /* We don't have any header to read or anything really, but + if we did, it would go here. We also might want to check + and be sure it's a valid file. */ + struct ast_filestream *tmp; + if ((tmp = malloc(sizeof(struct ast_filestream)))) { + memset(tmp, 0, sizeof(struct ast_filestream)); + if (ast_mutex_lock(&ilbc_lock)) { + ast_log(LOG_WARNING, "Unable to lock ilbc list\n"); + free(tmp); + return NULL; + } + tmp->f = f; + tmp->fr.data = tmp->ilbc; + tmp->fr.frametype = AST_FRAME_VOICE; + tmp->fr.subclass = AST_FORMAT_ILBC; + /* datalen will vary for each frame */ + tmp->fr.src = name; + tmp->fr.mallocd = 0; + glistcnt++; + ast_mutex_unlock(&ilbc_lock); + ast_update_use_count(); + } + return tmp; +} + +static struct ast_filestream *ilbc_rewrite(FILE *f, const char *comment) +{ + /* We don't have any header to read or anything really, but + if we did, it would go here. We also might want to check + and be sure it's a valid file. */ + struct ast_filestream *tmp; + if ((tmp = malloc(sizeof(struct ast_filestream)))) { + memset(tmp, 0, sizeof(struct ast_filestream)); + if (ast_mutex_lock(&ilbc_lock)) { + ast_log(LOG_WARNING, "Unable to lock ilbc list\n"); + free(tmp); + return NULL; + } + tmp->f = f; + glistcnt++; + ast_mutex_unlock(&ilbc_lock); + ast_update_use_count(); + } else + ast_log(LOG_WARNING, "Out of memory\n"); + return tmp; +} + +static void ilbc_close(struct ast_filestream *s) +{ + if (ast_mutex_lock(&ilbc_lock)) { + ast_log(LOG_WARNING, "Unable to lock ilbc list\n"); + return; + } + glistcnt--; + ast_mutex_unlock(&ilbc_lock); + ast_update_use_count(); + fclose(s->f); + free(s); + s = NULL; +} + +static struct ast_frame *ilbc_read(struct ast_filestream *s, int *whennext) +{ + int res; + /* Send a frame from the file to the appropriate channel */ + s->fr.frametype = AST_FRAME_VOICE; + s->fr.subclass = AST_FORMAT_ILBC; + s->fr.offset = AST_FRIENDLY_OFFSET; + s->fr.samples = 240; + s->fr.datalen = 50; + s->fr.mallocd = 0; + s->fr.data = s->ilbc; + if ((res = fread(s->ilbc, 1, 50, s->f)) != 50) { + if (res) + ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno)); + return NULL; + } + *whennext = s->fr.samples; + return &s->fr; +} + +static int ilbc_write(struct ast_filestream *fs, struct ast_frame *f) +{ + int res; + if (f->frametype != AST_FRAME_VOICE) { + ast_log(LOG_WARNING, "Asked to write non-voice frame!\n"); + return -1; + } + if (f->subclass != AST_FORMAT_ILBC) { + ast_log(LOG_WARNING, "Asked to write non-iLBC frame (%d)!\n", f->subclass); + return -1; + } + if (f->datalen % 50) { + ast_log(LOG_WARNING, "Invalid data length, %d, should be multiple of 50\n", f->datalen); + return -1; + } + if ((res = fwrite(f->data, 1, f->datalen, fs->f)) != f->datalen) { + ast_log(LOG_WARNING, "Bad write (%d/50): %s\n", res, strerror(errno)); + return -1; + } + return 0; +} + +static char *ilbc_getcomment(struct ast_filestream *s) +{ + return NULL; +} + +static int ilbc_seek(struct ast_filestream *fs, long sample_offset, int whence) +{ + long bytes; + off_t min,cur,max,offset=0; + min = 0; + cur = ftell(fs->f); + fseek(fs->f, 0, SEEK_END); + max = ftell(fs->f); + + bytes = 50 * (sample_offset / 240); + if (whence == SEEK_SET) + offset = bytes; + else if (whence == SEEK_CUR || whence == SEEK_FORCECUR) + offset = cur + bytes; + else if (whence == SEEK_END) + offset = max - bytes; + if (whence != SEEK_FORCECUR) { + offset = (offset > max)?max:offset; + } + /* protect against seeking beyond begining. */ + offset = (offset < min)?min:offset; + if (fseek(fs->f, offset, SEEK_SET) < 0) + return -1; + return 0; +} + +static int ilbc_trunc(struct ast_filestream *fs) +{ + /* Truncate file to current length */ + if (ftruncate(fileno(fs->f), ftell(fs->f)) < 0) + return -1; + return 0; +} + +static long ilbc_tell(struct ast_filestream *fs) +{ + off_t offset; + offset = ftell(fs->f); + return (offset/50)*240; +} + +int load_module() +{ + return ast_format_register(name, exts, AST_FORMAT_ILBC, + ilbc_open, + ilbc_rewrite, + ilbc_write, + ilbc_seek, + ilbc_trunc, + ilbc_tell, + ilbc_read, + ilbc_close, + ilbc_getcomment); + + +} + +int unload_module() +{ + return ast_format_unregister(name); +} + +int usecount() +{ + return glistcnt; +} + +char *description() +{ + return desc; +} + + +char *key() +{ + return ASTERISK_GPL_KEY; +} |