159 lines
4.2 KiB
C
159 lines
4.2 KiB
C
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/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2010, Anthony Minessale and Digium, Inc.
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* Anthony Minessale (anthmct@yahoo.com)
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* Kevin P. Fleming <kpfleming@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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*
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* \brief ITU G.719 , 64kbps bitrate only
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* \arg File name extensions: g719
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* \ingroup formats
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*/
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/*** MODULEINFO
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<support_level>core</support_level>
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***/
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#include "asterisk.h"
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#include "asterisk/mod_format.h"
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#include "asterisk/module.h"
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#include "asterisk/endian.h"
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#include "asterisk/format_cache.h"
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#define BUF_SIZE 160 /* 20 milliseconds == 160 bytes, 960 samples */
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#define SAMPLES_TO_BYTES(x) ((typeof(x)) x / ((float) 960 / 160))
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#define BYTES_TO_SAMPLES(x) ((typeof(x)) x * ((float) 960 / 160))
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static struct ast_frame *g719read(struct ast_filestream *s, int *whennext)
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{
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size_t res;
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/* Send a frame from the file to the appropriate channel */
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AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
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if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
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if (res) {
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ast_log(LOG_WARNING, "Short read of %s data (expected %d bytes, read %zu): %s\n",
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ast_format_get_name(s->fr.subclass.format), s->fr.datalen, res,
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strerror(errno));
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}
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return NULL;
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}
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*whennext = s->fr.samples = BYTES_TO_SAMPLES(res);
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return &s->fr;
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}
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static int g719write(struct ast_filestream *fs, struct ast_frame *f)
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{
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int res;
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if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->f)) != f->datalen) {
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ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
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return -1;
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}
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return 0;
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}
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static int g719seek(struct ast_filestream *fs, off_t sample_offset, int whence)
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{
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off_t offset = 0, min = 0, cur, max;
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sample_offset = SAMPLES_TO_BYTES(sample_offset);
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if ((cur = ftello(fs->f)) < 0) {
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ast_log(AST_LOG_WARNING, "Unable to determine current position in g719 filestream %p: %s\n", fs, strerror(errno));
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return -1;
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}
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if (fseeko(fs->f, 0, SEEK_END) < 0) {
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ast_log(AST_LOG_WARNING, "Unable to seek to end of g719 filestream %p: %s\n", fs, strerror(errno));
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return -1;
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}
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if ((max = ftello(fs->f)) < 0) {
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ast_log(AST_LOG_WARNING, "Unable to determine max position in g719 filestream %p: %s\n", fs, strerror(errno));
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return -1;
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}
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if (whence == SEEK_SET)
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offset = sample_offset;
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else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
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offset = sample_offset + cur;
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else if (whence == SEEK_END)
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offset = max - sample_offset;
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if (whence != SEEK_FORCECUR)
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offset = (offset > max) ? max : offset;
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/* always protect against seeking past begining. */
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offset = (offset < min) ? min : offset;
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return fseeko(fs->f, offset, SEEK_SET);
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}
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static int g719trunc(struct ast_filestream *fs)
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{
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int fd;
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off_t cur;
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if ((fd = fileno(fs->f)) < 0) {
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ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for g719 filestream %p: %s\n", fs, strerror(errno));
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return -1;
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}
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if ((cur = ftello(fs->f)) < 0) {
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ast_log(AST_LOG_WARNING, "Unable to determine current position in g719 filestream %p: %s\n", fs, strerror(errno));
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return -1;
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}
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return ftruncate(fd, cur);
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}
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static off_t g719tell(struct ast_filestream *fs)
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{
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return BYTES_TO_SAMPLES(ftello(fs->f));
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}
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static struct ast_format_def g719_f = {
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.name = "g719",
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.exts = "g719",
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.write = g719write,
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.seek = g719seek,
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.trunc = g719trunc,
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.tell = g719tell,
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.read = g719read,
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.buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
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};
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static int load_module(void)
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{
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g719_f.format = ast_format_g719;
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if (ast_format_def_register(&g719_f))
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return AST_MODULE_LOAD_DECLINE;
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return AST_MODULE_LOAD_SUCCESS;
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}
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static int unload_module(void)
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{
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return ast_format_def_unregister(g719_f.name);
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}
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AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "ITU G.719",
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.support_level = AST_MODULE_SUPPORT_CORE,
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.load = load_module,
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.unload = unload_module,
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.load_pri = AST_MODPRI_APP_DEPEND
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);
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