560 lines
16 KiB
C
560 lines
16 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 GSM in the proprietary Microsoft format.
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*
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* Microsoft WAV format (Proprietary GSM)
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* \arg File name extension: WAV,wav49 (Upper case WAV, lower case is another format)
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* This format can be played on Windows systems, used for
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* e-mail attachments mainly.
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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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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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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 "msgsm.h"
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/* Some Ideas for this code came from makewave.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 MSGSM_FRAME_SIZE 65
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#define MSGSM_DATA_OFFSET 60 /* offset of data bytes */
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#define GSM_SAMPLES 160 /* samples in a GSM block */
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#define MSGSM_SAMPLES (2*GSM_SAMPLES) /* samples in an MSGSM block */
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/* begin binary data: */
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static char msgsm_silence[] = /* 65 */
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{0x48,0x17,0xD6,0x84,0x02,0x80,0x24,0x49,0x92,0x24,0x89,0x02,0x80,0x24,0x49
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,0x92,0x24,0x89,0x02,0x80,0x24,0x49,0x92,0x24,0x89,0x02,0x80,0x24,0x49,0x92
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,0x24,0x09,0x82,0x74,0x61,0x4D,0x28,0x00,0x48,0x92,0x24,0x49,0x92,0x28,0x00
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,0x48,0x92,0x24,0x49,0x92,0x28,0x00,0x48,0x92,0x24,0x49,0x92,0x28,0x00,0x48
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,0x92,0x24,0x49,0x92,0x00};
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/* end binary data. size = 65 bytes */
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struct wavg_desc {
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/* Believe it or not, we must decode/recode to account for the
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weird MS format */
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int secondhalf; /* Are we on the second half */
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};
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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#define htoll(b) (b)
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#define htols(b) (b)
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#define ltohl(b) (b)
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#define ltohs(b) (b)
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#else
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#if __BYTE_ORDER == __BIG_ENDIAN
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#define htoll(b) \
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(((((b) ) & 0xFF) << 24) | \
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((((b) >> 8) & 0xFF) << 16) | \
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((((b) >> 16) & 0xFF) << 8) | \
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((((b) >> 24) & 0xFF) ))
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#define htols(b) \
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(((((b) ) & 0xFF) << 8) | \
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((((b) >> 8) & 0xFF) ))
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#define ltohl(b) htoll(b)
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#define ltohs(b) htols(b)
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#else
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#error "Endianess not defined"
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#endif
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#endif
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static int check_header(FILE *f)
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{
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int type, size, formtype;
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int fmt, hsize, fact;
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short format, chans;
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int freq;
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int data;
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if (fread(&type, 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Read failed (type)\n");
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return -1;
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}
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if (fread(&size, 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Read failed (size)\n");
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return -1;
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}
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size = ltohl(size);
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if (fread(&formtype, 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Read failed (formtype)\n");
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return -1;
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}
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if (memcmp(&type, "RIFF", 4)) {
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ast_log(LOG_WARNING, "Does not begin with RIFF\n");
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return -1;
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}
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if (memcmp(&formtype, "WAVE", 4)) {
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ast_log(LOG_WARNING, "Does not contain WAVE\n");
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return -1;
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}
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if (fread(&fmt, 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Read failed (fmt)\n");
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return -1;
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}
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if (memcmp(&fmt, "fmt ", 4)) {
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ast_log(LOG_WARNING, "Does not say fmt\n");
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return -1;
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}
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if (fread(&hsize, 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Read failed (formtype)\n");
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return -1;
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}
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if (ltohl(hsize) != 20) {
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ast_log(LOG_WARNING, "Unexpected header size %d\n", ltohl(hsize));
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return -1;
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}
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if (fread(&format, 1, 2, f) != 2) {
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ast_log(LOG_WARNING, "Read failed (format)\n");
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return -1;
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}
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if (ltohs(format) != 49) {
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ast_log(LOG_WARNING, "Not a GSM file %d\n", ltohs(format));
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return -1;
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}
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if (fread(&chans, 1, 2, f) != 2) {
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ast_log(LOG_WARNING, "Read failed (format)\n");
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return -1;
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}
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if (ltohs(chans) != 1) {
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ast_log(LOG_WARNING, "Not in mono %d\n", ltohs(chans));
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return -1;
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}
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if (fread(&freq, 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Read failed (freq)\n");
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return -1;
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}
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if (ltohl(freq) != DEFAULT_SAMPLE_RATE) {
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ast_log(LOG_WARNING, "Unexpected frequency %d\n", ltohl(freq));
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return -1;
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}
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/* Ignore the byte frequency */
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if (fread(&freq, 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Read failed (X_1)\n");
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return -1;
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}
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/* Ignore the two weird fields */
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if (fread(&freq, 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Read failed (X_2/X_3)\n");
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return -1;
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}
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/* Ignore the byte frequency */
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if (fread(&freq, 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Read failed (Y_1)\n");
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return -1;
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}
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/* Check for the word fact */
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if (fread(&fact, 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Read failed (fact)\n");
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return -1;
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}
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if (memcmp(&fact, "fact", 4)) {
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ast_log(LOG_WARNING, "Does not say fact\n");
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return -1;
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}
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/* Ignore the "fact value" */
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if (fread(&fact, 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Read failed (fact header)\n");
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return -1;
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}
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if (fread(&fact, 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Read failed (fact value)\n");
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return -1;
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}
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/* Check for the word data */
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if (fread(&data, 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Read failed (data)\n");
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return -1;
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}
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if (memcmp(&data, "data", 4)) {
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ast_log(LOG_WARNING, "Does not say data\n");
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return -1;
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}
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/* Ignore the data length */
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if (fread(&data, 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Read failed (data)\n");
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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 update_header(FILE *f)
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{
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off_t cur,end,bytes;
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int datalen, filelen, samples;
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cur = ftello(f);
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fseek(f, 0, SEEK_END);
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end = ftello(f);
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/* in a gsm WAV, data starts 60 bytes in */
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bytes = end - MSGSM_DATA_OFFSET;
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samples = htoll(bytes / MSGSM_FRAME_SIZE * MSGSM_SAMPLES);
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datalen = htoll(bytes);
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filelen = htoll(MSGSM_DATA_OFFSET - 8 + bytes);
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if (cur < 0) {
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ast_log(LOG_WARNING, "Unable to find our position\n");
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return -1;
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}
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if (fseek(f, 4, SEEK_SET)) {
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ast_log(LOG_WARNING, "Unable to set our position\n");
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return -1;
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}
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if (fwrite(&filelen, 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Unable to write file size\n");
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return -1;
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}
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if (fseek(f, 48, SEEK_SET)) {
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ast_log(LOG_WARNING, "Unable to set our position\n");
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return -1;
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}
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if (fwrite(&samples, 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Unable to write samples\n");
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return -1;
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}
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if (fseek(f, 56, SEEK_SET)) {
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ast_log(LOG_WARNING, "Unable to set our position\n");
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return -1;
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}
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if (fwrite(&datalen, 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Unable to write datalen\n");
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return -1;
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}
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if (fseeko(f, cur, SEEK_SET)) {
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ast_log(LOG_WARNING, "Unable to return to position\n");
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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 write_header(FILE *f)
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{
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/* Samples per second (always 8000 for this format). */
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unsigned int sample_rate = htoll(8000);
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/* Bytes per second (always 1625 for this format). */
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unsigned int byte_sample_rate = htoll(1625);
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/* This is the size of the "fmt " subchunk */
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unsigned int fmtsize = htoll(20);
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/* WAV #49 */
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unsigned short fmt = htols(49);
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/* Mono = 1 channel */
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unsigned short chans = htols(1);
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/* Each block of data is exactly 65 bytes in size. */
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unsigned int block_align = htoll(MSGSM_FRAME_SIZE);
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/* Not actually 2, but rounded up to the nearest bit */
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unsigned short bits_per_sample = htols(2);
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/* Needed for compressed formats */
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unsigned short extra_format = htols(MSGSM_SAMPLES);
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/* This is the size of the "fact" subchunk */
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unsigned int factsize = htoll(4);
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/* Number of samples in the data chunk */
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unsigned int num_samples = htoll(0);
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/* Number of bytes in the data chunk */
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unsigned int size = htoll(0);
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/* Write a GSM header, ignoring sizes which will be filled in later */
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/* 0: Chunk ID */
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if (fwrite("RIFF", 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Unable to write header\n");
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return -1;
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}
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/* 4: Chunk Size */
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if (fwrite(&size, 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Unable to write header\n");
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return -1;
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}
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/* 8: Chunk Format */
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if (fwrite("WAVE", 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Unable to write header\n");
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return -1;
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}
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/* 12: Subchunk 1: ID */
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if (fwrite("fmt ", 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Unable to write header\n");
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return -1;
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}
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/* 16: Subchunk 1: Size (minus 8) */
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if (fwrite(&fmtsize, 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Unable to write header\n");
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return -1;
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}
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/* 20: Subchunk 1: Audio format (49) */
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if (fwrite(&fmt, 1, 2, f) != 2) {
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ast_log(LOG_WARNING, "Unable to write header\n");
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return -1;
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}
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/* 22: Subchunk 1: Number of channels */
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if (fwrite(&chans, 1, 2, f) != 2) {
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ast_log(LOG_WARNING, "Unable to write header\n");
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return -1;
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}
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/* 24: Subchunk 1: Sample rate */
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if (fwrite(&sample_rate, 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Unable to write header\n");
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return -1;
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}
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/* 28: Subchunk 1: Byte rate */
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if (fwrite(&byte_sample_rate, 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Unable to write header\n");
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return -1;
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}
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/* 32: Subchunk 1: Block align */
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if (fwrite(&block_align, 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Unable to write header\n");
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return -1;
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}
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/* 36: Subchunk 1: Bits per sample */
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if (fwrite(&bits_per_sample, 1, 2, f) != 2) {
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ast_log(LOG_WARNING, "Unable to write header\n");
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return -1;
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}
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/* 38: Subchunk 1: Extra format bytes */
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if (fwrite(&extra_format, 1, 2, f) != 2) {
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ast_log(LOG_WARNING, "Unable to write header\n");
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return -1;
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}
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/* 40: Subchunk 2: ID */
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if (fwrite("fact", 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Unable to write header\n");
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return -1;
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}
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/* 44: Subchunk 2: Size (minus 8) */
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if (fwrite(&factsize, 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Unable to write header\n");
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return -1;
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}
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/* 48: Subchunk 2: Number of samples */
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if (fwrite(&num_samples, 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Unable to write header\n");
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return -1;
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}
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/* 52: Subchunk 3: ID */
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if (fwrite("data", 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Unable to write header\n");
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return -1;
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}
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/* 56: Subchunk 3: Size */
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if (fwrite(&size, 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Unable to write header\n");
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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 wav_open(struct ast_filestream *s)
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{
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/* We don't have any header to read or anything really, but
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if we did, it would go here. We also might want to check
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and be sure it's a valid file. */
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struct wavg_desc *fs = (struct wavg_desc *)s->_private;
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if (check_header(s->f))
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return -1;
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fs->secondhalf = 0; /* not strictly necessary */
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return 0;
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}
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static int wav_rewrite(struct ast_filestream *s, const char *comment)
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{
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/* We don't have any header to read or anything really, but
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if we did, it would go here. We also might want to check
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and be sure it's a valid file. */
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if (write_header(s->f))
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return -1;
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return 0;
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}
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static struct ast_frame *wav_read(struct ast_filestream *s, int *whennext)
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{
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/* Send a frame from the file to the appropriate channel */
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struct wavg_desc *fs = (struct wavg_desc *)s->_private;
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s->fr.frametype = AST_FRAME_VOICE;
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ast_format_set(&s->fr.subclass.format, AST_FORMAT_GSM, 0);
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s->fr.offset = AST_FRIENDLY_OFFSET;
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s->fr.samples = GSM_SAMPLES;
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s->fr.mallocd = 0;
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AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, GSM_FRAME_SIZE);
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if (fs->secondhalf) {
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/* Just return a frame based on the second GSM frame */
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s->fr.data.ptr = (char *)s->fr.data.ptr + GSM_FRAME_SIZE;
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s->fr.offset += GSM_FRAME_SIZE;
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} else {
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/* read and convert */
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unsigned char msdata[MSGSM_FRAME_SIZE];
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int res;
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if ((res = fread(msdata, 1, MSGSM_FRAME_SIZE, s->f)) != MSGSM_FRAME_SIZE) {
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if (res && (res != 1))
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ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
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return NULL;
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}
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/* Convert from MS format to two real GSM frames */
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conv65(msdata, s->fr.data.ptr);
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}
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fs->secondhalf = !fs->secondhalf;
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*whennext = GSM_SAMPLES;
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return &s->fr;
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}
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static int wav_write(struct ast_filestream *s, struct ast_frame *f)
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{
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int len;
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int size;
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struct wavg_desc *fs = (struct wavg_desc *)s->_private;
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if (f->frametype != AST_FRAME_VOICE) {
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ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
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return -1;
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}
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if (f->subclass.format.id != AST_FORMAT_GSM) {
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ast_log(LOG_WARNING, "Asked to write non-GSM frame (%s)!\n", ast_getformatname(&f->subclass.format));
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return -1;
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}
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/* XXX this might fail... if the input is a multiple of MSGSM_FRAME_SIZE
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* we assume it is already in the correct format.
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*/
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if (!(f->datalen % MSGSM_FRAME_SIZE)) {
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size = MSGSM_FRAME_SIZE;
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fs->secondhalf = 0;
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} else {
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size = GSM_FRAME_SIZE;
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}
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for (len = 0; len < f->datalen ; len += size) {
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int res;
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unsigned char *src, msdata[MSGSM_FRAME_SIZE];
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if (fs->secondhalf) { /* second half of raw gsm to be converted */
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memcpy(s->buf + GSM_FRAME_SIZE, f->data.ptr + len, GSM_FRAME_SIZE);
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conv66((unsigned char *) s->buf, msdata);
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src = msdata;
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fs->secondhalf = 0;
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} else if (size == GSM_FRAME_SIZE) { /* first half of raw gsm */
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memcpy(s->buf, f->data.ptr + len, GSM_FRAME_SIZE);
|
|
src = NULL; /* nothing to write */
|
|
fs->secondhalf = 1;
|
|
} else { /* raw msgsm data */
|
|
src = f->data.ptr + len;
|
|
}
|
|
if (src && (res = fwrite(src, 1, MSGSM_FRAME_SIZE, s->f)) != MSGSM_FRAME_SIZE) {
|
|
ast_log(LOG_WARNING, "Bad write (%d/65): %s\n", res, strerror(errno));
|
|
return -1;
|
|
}
|
|
update_header(s->f); /* XXX inefficient! */
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int wav_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
|
|
{
|
|
off_t offset=0, distance, max;
|
|
struct wavg_desc *s = (struct wavg_desc *)fs->_private;
|
|
|
|
off_t min = MSGSM_DATA_OFFSET;
|
|
off_t cur = ftello(fs->f);
|
|
fseek(fs->f, 0, SEEK_END);
|
|
max = ftello(fs->f); /* XXX ideally, should round correctly */
|
|
/* Compute the distance in bytes, rounded to the block size */
|
|
distance = (sample_offset/MSGSM_SAMPLES) * MSGSM_FRAME_SIZE;
|
|
if (whence == SEEK_SET)
|
|
offset = distance + min;
|
|
else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
|
|
offset = distance + cur;
|
|
else if (whence == SEEK_END)
|
|
offset = max - distance;
|
|
/* always protect against seeking past end of header */
|
|
if (offset < min)
|
|
offset = min;
|
|
if (whence != SEEK_FORCECUR) {
|
|
if (offset > max)
|
|
offset = max;
|
|
} else if (offset > max) {
|
|
int i;
|
|
fseek(fs->f, 0, SEEK_END);
|
|
for (i=0; i< (offset - max) / MSGSM_FRAME_SIZE; i++) {
|
|
if (!fwrite(msgsm_silence, 1, MSGSM_FRAME_SIZE, fs->f)) {
|
|
ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
|
|
}
|
|
}
|
|
}
|
|
s->secondhalf = 0;
|
|
return fseeko(fs->f, offset, SEEK_SET);
|
|
}
|
|
|
|
static int wav_trunc(struct ast_filestream *fs)
|
|
{
|
|
if (ftruncate(fileno(fs->f), ftello(fs->f)))
|
|
return -1;
|
|
return update_header(fs->f);
|
|
}
|
|
|
|
static off_t wav_tell(struct ast_filestream *fs)
|
|
{
|
|
off_t offset;
|
|
offset = ftello(fs->f);
|
|
/* since this will most likely be used later in play or record, lets stick
|
|
* to that level of resolution, just even frames boundaries */
|
|
return (offset - MSGSM_DATA_OFFSET)/MSGSM_FRAME_SIZE*MSGSM_SAMPLES;
|
|
}
|
|
|
|
static struct ast_format_def wav49_f = {
|
|
.name = "wav49",
|
|
.exts = "WAV|wav49",
|
|
.open = wav_open,
|
|
.rewrite = wav_rewrite,
|
|
.write = wav_write,
|
|
.seek = wav_seek,
|
|
.trunc = wav_trunc,
|
|
.tell = wav_tell,
|
|
.read = wav_read,
|
|
.buf_size = 2*GSM_FRAME_SIZE + AST_FRIENDLY_OFFSET,
|
|
.desc_size = sizeof(struct wavg_desc),
|
|
};
|
|
|
|
static int load_module(void)
|
|
{
|
|
ast_format_set(&wav49_f.format, AST_FORMAT_GSM, 0);
|
|
if (ast_format_def_register(&wav49_f))
|
|
return AST_MODULE_LOAD_FAILURE;
|
|
return AST_MODULE_LOAD_SUCCESS;
|
|
}
|
|
|
|
static int unload_module(void)
|
|
{
|
|
return ast_format_def_unregister(wav49_f.name);
|
|
}
|
|
|
|
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Microsoft WAV format (Proprietary GSM)",
|
|
.load = load_module,
|
|
.unload = unload_module,
|
|
.load_pri = AST_MODPRI_APP_DEPEND
|
|
);
|