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/*
* Asterisk -- An open source telephony toolkit.
*
* 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 Flat, binary, ADPCM vox file format.
* \arg File name extensions: vox
*
* \ingroup formats
*/
#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
#include "asterisk/mod_format.h"
#include "asterisk/module.h"
#include "asterisk/endian.h"
#define BUF_SIZE 80 /* 80 bytes, 160 samples */
#define VOX_SAMPLES 160
static struct ast_frame *vox_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;
ast_format_set(&s->fr.subclass.format, AST_FORMAT_ADPCM, 0);
s->fr.mallocd = 0;
AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) < 1) {
if (res)
ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
return NULL;
}
*whennext = s->fr.samples = res * 2;
s->fr.datalen = res;
return &s->fr;
}
static int vox_write(struct ast_filestream *s, 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.format.id != AST_FORMAT_ADPCM) {
ast_log(LOG_WARNING, "Asked to write non-ADPCM frame (%s)!\n", ast_getformatname(&f->subclass.format));
return -1;
}
if ((res = fwrite(f->data.ptr, 1, f->datalen, s->f)) != f->datalen) {
ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
return -1;
}
return 0;
}
static int vox_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
{
off_t offset=0,min,cur,max,distance;
min = 0;
cur = ftello(fs->f);
fseeko(fs->f, 0, SEEK_END);
max = ftello(fs->f);
/* have to fudge to frame here, so not fully to sample */
distance = sample_offset/2;
if(whence == SEEK_SET)
offset = distance;
else if(whence == SEEK_CUR || whence == SEEK_FORCECUR)
offset = distance + cur;
else if(whence == SEEK_END)
offset = max - distance;
if (whence != SEEK_FORCECUR) {
offset = (offset > max)?max:offset;
offset = (offset < min)?min:offset;
}
return fseeko(fs->f, offset, SEEK_SET);
}
static int vox_trunc(struct ast_filestream *fs)
{
return ftruncate(fileno(fs->f), ftello(fs->f));
}
static off_t vox_tell(struct ast_filestream *fs)
{
off_t offset;
offset = ftello(fs->f) << 1;
return offset;
}
static struct ast_format_def vox_f = {
.name = "vox",
.exts = "vox",
.write = vox_write,
.seek = vox_seek,
.trunc = vox_trunc,
.tell = vox_tell,
.read = vox_read,
.buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
};
static int load_module(void)
{
ast_format_set(&vox_f.format, AST_FORMAT_ADPCM, 0);
if (ast_format_def_register(&vox_f))
return AST_MODULE_LOAD_FAILURE;
return AST_MODULE_LOAD_SUCCESS;
}
static int unload_module(void)
{
return ast_format_def_unregister(vox_f.name);
}
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Dialogic VOX (ADPCM) File Format",
.load = load_module,
.unload = unload_module,
.load_pri = AST_MODPRI_APP_DEPEND
);
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