538 lines
14 KiB
C
538 lines
14 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 Work with WAV in the proprietary Microsoft format.
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* Microsoft WAV format (8000hz Signed Linear)
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* \arg File name extension: wav (lower case)
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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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/* 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 WAV_BUF_SIZE 320
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struct wav_desc { /* format-specific parameters */
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int hz;
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int bytes;
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int lasttimeout;
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int maxlen;
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struct timeval last;
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};
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#define BLOCKSIZE 160
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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_fmt(FILE *f, int hsize, int hz)
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{
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short format, chans, bysam, bisam;
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int bysec;
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int freq;
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if (hsize < 16) {
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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) != 1) {
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ast_log(LOG_WARNING, "Not a wav 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) != 8000) && (ltohl(freq) != 16000)) ||
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((ltohl(freq) == 8000) && (hz != 8000)) ||
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((ltohl(freq) == 16000) && (hz != 16000))) {
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ast_log(LOG_WARNING, "Unexpected frequency mismatch %d (expecting %d)\n", ltohl(freq),hz);
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return -1;
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}
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/* Ignore the byte frequency */
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if (fread(&bysec, 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Read failed (BYTES_PER_SECOND)\n");
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return -1;
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}
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/* Check bytes per sample */
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if (fread(&bysam, 1, 2, f) != 2) {
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ast_log(LOG_WARNING, "Read failed (BYTES_PER_SAMPLE)\n");
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return -1;
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}
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if (ltohs(bysam) != 2) {
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ast_log(LOG_WARNING, "Can only handle 16bits per sample: %d\n", ltohs(bysam));
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return -1;
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}
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if (fread(&bisam, 1, 2, f) != 2) {
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ast_log(LOG_WARNING, "Read failed (Bits Per Sample): %d\n", ltohs(bisam));
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return -1;
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}
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/* Skip any additional header */
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if (fseek(f,ltohl(hsize)-16,SEEK_CUR) == -1 ) {
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ast_log(LOG_WARNING, "Failed to skip remaining header bytes: %d\n", ltohl(hsize)-16 );
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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 check_header(FILE *f, int hz)
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{
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int type, size, formtype;
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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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/* Skip any facts and get the first data block */
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for(;;)
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{
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char buf[4];
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/* Begin data chunk */
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if (fread(&buf, 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Read failed (block header format)\n");
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return -1;
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}
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/* Data has the actual length of data in it */
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if (fread(&data, 1, 4, f) != 4) {
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ast_log(LOG_WARNING, "Read failed (block '%.4s' header length)\n", buf);
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return -1;
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}
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data = ltohl(data);
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if (memcmp(&buf, "fmt ", 4) == 0) {
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if (check_header_fmt(f, data, hz))
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return -1;
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continue;
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}
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if(memcmp(buf, "data", 4) == 0 )
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break;
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ast_log(LOG_DEBUG, "Skipping unknown block '%.4s'\n", buf);
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if (fseek(f,data,SEEK_CUR) == -1 ) {
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ast_log(LOG_WARNING, "Failed to skip '%.4s' block: %d\n", buf, data);
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return -1;
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}
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}
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#if 0
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curpos = lseek(fd, 0, SEEK_CUR);
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truelength = lseek(fd, 0, SEEK_END);
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lseek(fd, curpos, SEEK_SET);
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truelength -= curpos;
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#endif
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return data;
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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;
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int datalen,filelen,bytes;
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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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/* data starts 44 bytes in */
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bytes = end - 44;
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datalen = htoll(bytes);
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/* chunk size is bytes of data plus 36 bytes of header */
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filelen = htoll(36 + 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 set write file size\n");
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return -1;
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}
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if (fseek(f, 40, 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 set 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, int writehz)
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{
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unsigned int hz;
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unsigned int bhz;
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unsigned int hs = htoll(16);
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unsigned short fmt = htols(1);
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unsigned short chans = htols(1);
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unsigned short bysam = htols(2);
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unsigned short bisam = htols(16);
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unsigned int size = htoll(0);
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if (writehz == 16000) {
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hz = htoll(16000);
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bhz = htoll(32000);
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} else {
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hz = htoll(8000);
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bhz = htoll(16000);
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}
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/* Write a wav header, ignoring sizes which will be filled in later */
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fseek(f,0,SEEK_SET);
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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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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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if (fwrite("WAVEfmt ", 1, 8, f) != 8) {
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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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if (fwrite(&hs, 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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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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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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if (fwrite(&hz, 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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if (fwrite(&bhz, 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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if (fwrite(&bysam, 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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if (fwrite(&bisam, 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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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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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 wav_desc *tmp = (struct wav_desc *)s->_private;
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if ((tmp->maxlen = check_header(s->f, (s->fmt->format.id == AST_FORMAT_SLINEAR16 ? 16000 : 8000))) < 0)
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return -1;
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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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struct wav_desc *tmp = (struct wav_desc *)s->_private;
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tmp->hz = (s->fmt->format.id == AST_FORMAT_SLINEAR16 ? 16000 : 8000);
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if (write_header(s->f,tmp->hz))
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return -1;
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return 0;
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}
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static void wav_close(struct ast_filestream *s)
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{
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char zero = 0;
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struct wav_desc *fs = (struct wav_desc *)s->_private;
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if (s->filename) {
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update_header(s->f);
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}
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/* Pad to even length */
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if (fs->bytes & 0x1) {
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if (!fwrite(&zero, 1, 1, s->f)) {
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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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static struct ast_frame *wav_read(struct ast_filestream *s, int *whennext)
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{
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int res;
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int samples; /* actual samples read */
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#if __BYTE_ORDER == __BIG_ENDIAN
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int x;
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short *tmp;
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#endif
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int bytes;
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off_t here;
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/* Send a frame from the file to the appropriate channel */
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struct wav_desc *fs = (struct wav_desc *)s->_private;
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bytes = (fs->hz == 16000 ? (WAV_BUF_SIZE * 2) : WAV_BUF_SIZE);
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here = ftello(s->f);
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if (fs->maxlen - here < bytes) /* truncate if necessary */
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bytes = fs->maxlen - here;
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if (bytes < 0)
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bytes = 0;
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/* ast_debug(1, "here: %d, maxlen: %d, bytes: %d\n", here, s->maxlen, bytes); */
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s->fr.frametype = AST_FRAME_VOICE;
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ast_format_set(&s->fr.subclass.format, (fs->hz == 16000 ? AST_FORMAT_SLINEAR16 : AST_FORMAT_SLINEAR), 0);
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s->fr.mallocd = 0;
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AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, bytes);
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if ( (res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) <= 0 ) {
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if (res)
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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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s->fr.datalen = res;
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s->fr.samples = samples = res / 2;
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#if __BYTE_ORDER == __BIG_ENDIAN
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tmp = (short *)(s->fr.data.ptr);
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/* file format is little endian so we need to swap */
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for( x = 0; x < samples; x++)
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tmp[x] = (tmp[x] << 8) | ((tmp[x] & 0xff00) >> 8);
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#endif
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*whennext = samples;
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return &s->fr;
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}
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static int wav_write(struct ast_filestream *fs, struct ast_frame *f)
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{
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#if __BYTE_ORDER == __BIG_ENDIAN
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int x;
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short tmp[16000], *tmpi;
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#endif
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struct wav_desc *s = (struct wav_desc *)fs->_private;
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int res;
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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_SLINEAR) && (f->subclass.format.id != AST_FORMAT_SLINEAR16)) {
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ast_log(LOG_WARNING, "Asked to write non-SLINEAR%s frame (%s)!\n", s->hz == 16000 ? "16" : "", ast_getformatname(&f->subclass.format));
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return -1;
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}
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if (ast_format_cmp(&f->subclass.format, &fs->fmt->format) == AST_FORMAT_CMP_NOT_EQUAL) {
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ast_log(LOG_WARNING, "Can't change SLINEAR frequency during write\n");
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return -1;
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}
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if (!f->datalen)
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return -1;
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#if __BYTE_ORDER == __BIG_ENDIAN
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/* swap and write */
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if (f->datalen > sizeof(tmp)) {
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ast_log(LOG_WARNING, "Data length is too long\n");
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return -1;
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}
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tmpi = f->data.ptr;
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for (x=0; x < f->datalen/2; x++)
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tmp[x] = (tmpi[x] << 8) | ((tmpi[x] & 0xff00) >> 8);
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if ((res = fwrite(tmp, 1, f->datalen, fs->f)) != f->datalen ) {
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#else
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/* just write */
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if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->f)) != f->datalen ) {
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#endif
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ast_log(LOG_WARNING, "Bad write (%d): %s\n", res, strerror(errno));
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return -1;
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}
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s->bytes += f->datalen;
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return 0;
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}
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static int wav_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
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{
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off_t min, max, cur, offset = 0, samples;
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samples = sample_offset * 2; /* SLINEAR is 16 bits mono, so sample_offset * 2 = bytes */
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min = 44; /* wav header is 44 bytes */
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cur = ftello(fs->f);
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fseeko(fs->f, 0, SEEK_END);
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max = ftello(fs->f);
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if (whence == SEEK_SET)
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offset = samples + min;
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else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
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offset = samples + cur;
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else if (whence == SEEK_END)
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offset = max - samples;
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if (whence != SEEK_FORCECUR) {
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offset = (offset > max)?max:offset;
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}
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/* always protect the header space. */
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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 wav_trunc(struct ast_filestream *fs)
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{
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if (ftruncate(fileno(fs->f), ftello(fs->f)))
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return -1;
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return update_header(fs->f);
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}
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static off_t wav_tell(struct ast_filestream *fs)
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{
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off_t offset;
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offset = ftello(fs->f);
|
|
/* subtract header size to get samples, then divide by 2 for 16 bit samples */
|
|
return (offset - 44)/2;
|
|
}
|
|
|
|
static struct ast_format_def wav16_f = {
|
|
.name = "wav16",
|
|
.exts = "wav16",
|
|
.open = wav_open,
|
|
.rewrite = wav_rewrite,
|
|
.write = wav_write,
|
|
.seek = wav_seek,
|
|
.trunc = wav_trunc,
|
|
.tell = wav_tell,
|
|
.read = wav_read,
|
|
.close = wav_close,
|
|
.buf_size = (WAV_BUF_SIZE * 2) + AST_FRIENDLY_OFFSET,
|
|
.desc_size = sizeof(struct wav_desc),
|
|
};
|
|
|
|
static struct ast_format_def wav_f = {
|
|
.name = "wav",
|
|
.exts = "wav",
|
|
.open = wav_open,
|
|
.rewrite = wav_rewrite,
|
|
.write = wav_write,
|
|
.seek = wav_seek,
|
|
.trunc = wav_trunc,
|
|
.tell = wav_tell,
|
|
.read = wav_read,
|
|
.close = wav_close,
|
|
.buf_size = WAV_BUF_SIZE + AST_FRIENDLY_OFFSET,
|
|
.desc_size = sizeof(struct wav_desc),
|
|
};
|
|
|
|
static int load_module(void)
|
|
{
|
|
ast_format_set(&wav_f.format, AST_FORMAT_SLINEAR, 0);
|
|
ast_format_set(&wav16_f.format, AST_FORMAT_SLINEAR16, 0);
|
|
if (ast_format_def_register(&wav_f)
|
|
|| ast_format_def_register(&wav16_f))
|
|
return AST_MODULE_LOAD_FAILURE;
|
|
return AST_MODULE_LOAD_SUCCESS;
|
|
}
|
|
|
|
static int unload_module(void)
|
|
{
|
|
return ast_format_def_unregister(wav_f.name)
|
|
|| ast_format_def_unregister(wav16_f.name);
|
|
}
|
|
|
|
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Microsoft WAV/WAV16 format (8kHz/16kHz Signed Linear)",
|
|
.load = load_module,
|
|
.unload = unload_module,
|
|
.load_pri = AST_MODPRI_APP_DEPEND
|
|
);
|