git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@4229 65c4cc65-6c06-0410-ace0-fbb531ad65f3
320 lines
7.1 KiB
C
Executable file
320 lines
7.1 KiB
C
Executable file
/*
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* Asterisk -- A telephony toolkit for Linux.
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*
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* Flat, binary, alaw PCM file format.
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*
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* Copyright (C) 1999, Mark Spencer
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*
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* Mark Spencer <markster@linux-support.net>
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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
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*/
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#include <asterisk/lock.h>
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#include <asterisk/channel.h>
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#include <asterisk/file.h>
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#include <asterisk/logger.h>
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#include <asterisk/sched.h>
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#include <asterisk/module.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <stdlib.h>
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#include <sys/time.h>
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#include <sys/times.h>
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#include <sys/types.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#ifdef __linux__
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#include <endian.h>
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#else
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#include <machine/endian.h>
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#endif
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#define BUF_SIZE 160 /* 160 samples */
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// #define REALTIME_WRITE
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struct ast_filestream {
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void *reserved[AST_RESERVED_POINTERS];
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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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/* This is what a filestream means to us */
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int fd; /* Descriptor */
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struct ast_frame fr; /* Frame information */
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char waste[AST_FRIENDLY_OFFSET]; /* Buffer for sending frames, etc */
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char empty; /* Empty character */
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unsigned char buf[BUF_SIZE]; /* Output Buffer */
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#ifdef REALTIME_WRITE
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unsigned long start_time;
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#endif
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};
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AST_MUTEX_DEFINE_STATIC(pcm_lock);
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static int glistcnt = 0;
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static char *name = "alaw";
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static char *desc = "Raw aLaw 8khz PCM Audio support";
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static char *exts = "alaw|al";
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#if 0
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/* Returns time in msec since system boot. */
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static unsigned long get_time(void)
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{
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struct tms buf;
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clock_t cur;
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cur = times( &buf );
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if( cur < 0 )
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{
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ast_log( LOG_WARNING, "Cannot get current time\n" );
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return 0;
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}
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return cur * 1000 / sysconf( _SC_CLK_TCK );
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}
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#endif
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static struct ast_filestream *pcm_open(int fd)
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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 ast_filestream *tmp;
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if ((tmp = malloc(sizeof(struct ast_filestream)))) {
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memset(tmp, 0, sizeof(struct ast_filestream));
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if (ast_mutex_lock(&pcm_lock)) {
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ast_log(LOG_WARNING, "Unable to lock pcm list\n");
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free(tmp);
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return NULL;
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}
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tmp->fd = fd;
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tmp->fr.data = tmp->buf;
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tmp->fr.frametype = AST_FRAME_VOICE;
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tmp->fr.subclass = AST_FORMAT_ALAW;
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/* datalen will vary for each frame */
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tmp->fr.src = name;
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tmp->fr.mallocd = 0;
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#ifdef REALTIME_WRITE
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tmp->start_time = get_time();
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#endif
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glistcnt++;
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ast_mutex_unlock(&pcm_lock);
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ast_update_use_count();
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}
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return tmp;
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}
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static struct ast_filestream *pcm_rewrite(int fd, 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 ast_filestream *tmp;
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if ((tmp = malloc(sizeof(struct ast_filestream)))) {
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memset(tmp, 0, sizeof(struct ast_filestream));
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if (ast_mutex_lock(&pcm_lock)) {
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ast_log(LOG_WARNING, "Unable to lock pcm list\n");
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free(tmp);
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return NULL;
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}
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tmp->fd = fd;
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#ifdef REALTIME_WRITE
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tmp->start_time = get_time();
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#endif
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glistcnt++;
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ast_mutex_unlock(&pcm_lock);
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ast_update_use_count();
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} else
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ast_log(LOG_WARNING, "Out of memory\n");
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return tmp;
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}
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static void pcm_close(struct ast_filestream *s)
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{
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if (ast_mutex_lock(&pcm_lock)) {
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ast_log(LOG_WARNING, "Unable to lock pcm list\n");
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return;
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}
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glistcnt--;
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ast_mutex_unlock(&pcm_lock);
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ast_update_use_count();
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close(s->fd);
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free(s);
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s = NULL;
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}
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static struct ast_frame *pcm_read(struct ast_filestream *s, int *whennext)
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{
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int res;
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/* Send a frame from the file to the appropriate channel */
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s->fr.frametype = AST_FRAME_VOICE;
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s->fr.subclass = AST_FORMAT_ALAW;
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s->fr.offset = AST_FRIENDLY_OFFSET;
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s->fr.mallocd = 0;
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s->fr.data = s->buf;
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if ((res = read(s->fd, s->buf, BUF_SIZE)) < 1) {
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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.samples = res;
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s->fr.datalen = res;
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*whennext = s->fr.samples;
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return &s->fr;
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}
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static int pcm_write(struct ast_filestream *fs, struct ast_frame *f)
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{
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int res;
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#ifdef REALTIME_WRITE
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unsigned long cur_time;
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unsigned long fpos;
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struct stat stat_buf;
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#endif
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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 != AST_FORMAT_ALAW) {
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ast_log(LOG_WARNING, "Asked to write non-alaw frame (%d)!\n", f->subclass);
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return -1;
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}
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#ifdef REALTIME_WRITE
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cur_time = get_time();
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fpos = ( cur_time - fs->start_time ) * 8; // 8 bytes per msec
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// Check if we have written to this position yet. If we have, then increment pos by one frame
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// for some degree of protection against receiving packets in the same clock tick.
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fstat( fs->fd, &stat_buf );
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if( stat_buf.st_size > fpos )
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{
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fpos += f->datalen; // Incrementing with the size of this current frame
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}
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if( stat_buf.st_size < fpos )
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{
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// fill the gap with 0x55 rather than 0.
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char buf[ 512 ];
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unsigned long cur, to_write;
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cur = stat_buf.st_size;
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if( lseek( fs->fd, cur, SEEK_SET ) < 0 )
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{
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ast_log( LOG_WARNING, "Cannot seek in file: %s\n", strerror(errno) );
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return -1;
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}
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memset( buf, 0x55, 512 );
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while( cur < fpos )
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{
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to_write = fpos - cur;
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if( to_write > 512 )
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{
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to_write = 512;
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}
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write( fs->fd, buf, to_write );
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cur += to_write;
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}
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}
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if( lseek( fs->fd, fpos, SEEK_SET ) < 0 )
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{
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ast_log( LOG_WARNING, "Cannot seek in file: %s\n", strerror(errno) );
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return -1;
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}
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#endif // REALTIME_WRITE
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if ((res = write(fs->fd, f->data, f->datalen)) != 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 pcm_seek(struct ast_filestream *fs, long sample_offset, int whence)
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{
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off_t offset=0,min,cur,max;
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min = 0;
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cur = lseek(fs->fd, 0, SEEK_CUR);
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max = lseek(fs->fd, 0, SEEK_END);
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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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}
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// Always protect against seeking past begining
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offset = (offset < min)?min:offset;
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return lseek(fs->fd, offset, SEEK_SET);
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}
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static int pcm_trunc(struct ast_filestream *fs)
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{
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return ftruncate(fs->fd, lseek(fs->fd,0,SEEK_CUR));
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}
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static long pcm_tell(struct ast_filestream *fs)
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{
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off_t offset;
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offset = lseek(fs->fd, 0, SEEK_CUR);
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return offset;
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}
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static char *pcm_getcomment(struct ast_filestream *s)
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{
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return NULL;
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}
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int load_module()
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{
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return ast_format_register(name, exts, AST_FORMAT_ALAW,
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pcm_open,
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pcm_rewrite,
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pcm_write,
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pcm_seek,
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pcm_trunc,
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pcm_tell,
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pcm_read,
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pcm_close,
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pcm_getcomment);
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}
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int unload_module()
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{
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return ast_format_unregister(name);
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}
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int usecount()
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{
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int res;
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if (ast_mutex_lock(&pcm_lock)) {
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ast_log(LOG_WARNING, "Unable to lock pcm list\n");
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return -1;
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}
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res = glistcnt;
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ast_mutex_unlock(&pcm_lock);
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return res;
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}
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char *description()
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{
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return desc;
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}
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char *key()
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{
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return ASTERISK_GPL_KEY;
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}
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