Some formats are able to handle short reads while others are not, so restore the previous behavior for the format modules so that we don't have spurious errors when playing back files. ASTERISK-27232 #close Reported by: Jens T. Change-Id: Iab7f52b25a394f277566c8a2a4b15a692280a300
204 lines
5.5 KiB
C
204 lines
5.5 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2005, Digium, Inc.
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*
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* Mark Spencer <markster@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 Save to raw, headerless GSM data.
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* \arg File name extension: gsm
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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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#include "msgsm.h"
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/* Some Ideas for this code came from makegsme.c by Jeffrey Chilton */
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/* Portions of the conversion code are by guido@sienanet.it */
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#define GSM_FRAME_SIZE 33
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#define GSM_SAMPLES 160
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/* silent gsm frame */
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/* begin binary data: */
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static const char gsm_silence[] = /* 33 */
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{0xD8,0x20,0xA2,0xE1,0x5A,0x50,0x00,0x49,0x24,0x92,0x49,0x24,0x50,0x00,0x49
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,0x24,0x92,0x49,0x24,0x50,0x00,0x49,0x24,0x92,0x49,0x24,0x50,0x00,0x49,0x24
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,0x92,0x49,0x24};
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/* end binary data. size = 33 bytes */
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static struct ast_frame *gsm_read(struct ast_filestream *s, int *whennext)
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{
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size_t res;
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AST_FRAME_SET_BUFFER(&(s->fr), s->buf, AST_FRIENDLY_OFFSET, GSM_FRAME_SIZE);
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if ((res = fread(s->fr.data.ptr, 1, GSM_FRAME_SIZE, s->f)) != GSM_FRAME_SIZE) {
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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), GSM_FRAME_SIZE, 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 = GSM_SAMPLES;
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return &s->fr;
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}
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static int gsm_write(struct ast_filestream *fs, struct ast_frame *f)
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{
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int res;
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unsigned char gsm[2*GSM_FRAME_SIZE];
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if (!(f->datalen % 65)) {
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/* This is in MSGSM format, need to be converted */
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int len=0;
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while(len < f->datalen) {
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conv65(f->data.ptr + len, gsm);
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if ((res = fwrite(gsm, 1, 2*GSM_FRAME_SIZE, fs->f)) != 2*GSM_FRAME_SIZE) {
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ast_log(LOG_WARNING, "Bad write (%d/66): %s\n", res, strerror(errno));
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return -1;
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}
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len += 65;
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}
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} else {
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if (f->datalen % GSM_FRAME_SIZE) {
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ast_log(LOG_WARNING, "Invalid data length, %d, should be multiple of 33\n", f->datalen);
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return -1;
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}
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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/33): %s\n", res, strerror(errno));
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return -1;
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}
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}
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return 0;
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}
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static int gsm_seek(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, distance;
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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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/* have to fudge to frame here, so not fully to sample */
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distance = (sample_offset / GSM_SAMPLES) * GSM_FRAME_SIZE;
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if (whence == SEEK_SET) {
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offset = distance;
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} else if (whence == SEEK_CUR || whence == SEEK_FORCECUR) {
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offset = distance + cur;
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} else if (whence == SEEK_END) {
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offset = max - distance;
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}
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/* Always protect against seeking past the begining. */
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offset = (offset < min)?min:offset;
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if (whence != SEEK_FORCECUR) {
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offset = (offset > max)?max:offset;
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} else if (offset > max) {
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int i;
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fseeko(fs->f, 0, SEEK_END);
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for (i=0; i< (offset - max) / GSM_FRAME_SIZE; i++) {
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if (fwrite(gsm_silence, 1, GSM_FRAME_SIZE, fs->f) != GSM_FRAME_SIZE) {
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ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
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}
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}
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}
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return fseeko(fs->f, offset, SEEK_SET);
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}
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static int gsm_trunc(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 gsm 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 gsm filestream %p: %s\n", fs, strerror(errno));
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return -1;
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}
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/* Truncate file to current length */
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return ftruncate(fd, cur);
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}
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static off_t gsm_tell(struct ast_filestream *fs)
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{
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off_t offset = ftello(fs->f);
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if (offset < 0) {
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ast_log(AST_LOG_WARNING, "Unable to determine offset for gsm filestream %p: %s\n", fs, strerror(errno));
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return 0;
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}
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return (offset / GSM_FRAME_SIZE) * GSM_SAMPLES;
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}
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static struct ast_format_def gsm_f = {
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.name = "gsm",
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.exts = "gsm",
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.write = gsm_write,
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.seek = gsm_seek,
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.trunc = gsm_trunc,
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.tell = gsm_tell,
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.read = gsm_read,
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.buf_size = 2*GSM_FRAME_SIZE + AST_FRIENDLY_OFFSET, /* 2 gsm frames */
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};
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static int load_module(void)
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{
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gsm_f.format = ast_format_gsm;
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if (ast_format_def_register(&gsm_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(gsm_f.name);
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}
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AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Raw GSM data",
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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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