diff options
Diffstat (limited to 'trunk/formats/format_ilbc.c')
| -rw-r--r-- | trunk/formats/format_ilbc.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/trunk/formats/format_ilbc.c b/trunk/formats/format_ilbc.c new file mode 100644 index 000000000..aaddc6c38 --- /dev/null +++ b/trunk/formats/format_ilbc.c @@ -0,0 +1,146 @@ +/* + * 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 "asterisk.h" + +ASTERISK_FILE_VERSION(__FILE__, "$Revision$") + +#include "asterisk/mod_format.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 */ + +#define ILBC_BUF_SIZE 50 /* One Real iLBC Frame */ +#define ILBC_SAMPLES 240 + +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.mallocd = 0; + AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, ILBC_BUF_SIZE); + if ((res = fread(s->fr.data, 1, s->fr.datalen, s->f)) != s->fr.datalen) { + if (res) + ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno)); + return NULL; + } + *whennext = s->fr.samples = ILBC_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 int ilbc_seek(struct ast_filestream *fs, off_t sample_offset, int whence) +{ + long bytes; + off_t min,cur,max,offset=0; + min = 0; + cur = ftello(fs->f); + fseeko(fs->f, 0, SEEK_END); + max = ftello(fs->f); + + bytes = ILBC_BUF_SIZE * (sample_offset / ILBC_SAMPLES); + 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 (fseeko(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), ftello(fs->f)) < 0) + return -1; + return 0; +} + +static off_t ilbc_tell(struct ast_filestream *fs) +{ + off_t offset = ftello(fs->f); + return (offset/ILBC_BUF_SIZE)*ILBC_SAMPLES; +} + +static const struct ast_format ilbc_f = { + .name = "iLBC", + .exts = "ilbc", + .format = AST_FORMAT_ILBC, + .write = ilbc_write, + .seek = ilbc_seek, + .trunc = ilbc_trunc, + .tell = ilbc_tell, + .read = ilbc_read, + .buf_size = ILBC_BUF_SIZE + AST_FRIENDLY_OFFSET, +}; + +static int load_module(void) +{ + if (ast_format_register(&ilbc_f)) + return AST_MODULE_LOAD_FAILURE; + return AST_MODULE_LOAD_SUCCESS; +} + +static int unload_module(void) +{ + return ast_format_unregister(ilbc_f.name); +} + +AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Raw iLBC data"); |