Add Mahmut's Alaw patch
git-svn-id: http://svn.digium.com/svn/asterisk/trunk@672 f38db490-d61c-443f-a65b-d21fe96a405b
This commit is contained in:
markster
parent
5aa0810864
commit
4fb4f1a6be
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@ -11,7 +11,8 @@
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# the GNU General Public License
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#
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FORMAT_LIBS=format_g723.so format_wav.so format_mp3.so format_wav_gsm.so format_gsm.so format_vox.so format_pcm.so format_g729.so
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FORMAT_LIBS=format_g723.so format_wav.so format_mp3.so format_wav_gsm.so \
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format_gsm.so format_vox.so format_pcm.so format_g729.so format_pcm_alaw.so
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FORMAT_LIBS+=format_jpeg.so
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GSMLIB=../codecs/gsm/lib/libgsm.a
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@ -0,0 +1,418 @@
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/*
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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 <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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#include <pthread.h>
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#include <endian.h>
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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_channel *owner;
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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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int lasttimeout;
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struct timeval last;
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#ifdef REALTIME_WRITE
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unsigned long start_time;
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#endif
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int adj;
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struct ast_filestream *next;
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};
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static struct ast_filestream *glist = NULL;
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static pthread_mutex_t pcm_lock = AST_MUTEX_INITIALIZER;
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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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/* Returns time in msec since system boot. */
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static unsigned long get_time()
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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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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 (pthread_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->next = glist;
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glist = tmp;
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tmp->fd = fd;
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tmp->owner = NULL;
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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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tmp->lasttimeout = -1;
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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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pthread_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, 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 (pthread_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->next = glist;
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glist = tmp;
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tmp->fd = fd;
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tmp->owner = NULL;
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tmp->lasttimeout = -1;
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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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pthread_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 struct ast_frame *pcm_read(struct ast_filestream *s)
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{
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return NULL;
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}
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static void pcm_close(struct ast_filestream *s)
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{
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struct ast_filestream *tmp, *tmpl = NULL;
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if (pthread_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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tmp = glist;
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while(tmp) {
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if (tmp == s) {
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if (tmpl)
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tmpl->next = tmp->next;
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else
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glist = tmp->next;
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break;
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}
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tmpl = tmp;
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tmp = tmp->next;
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}
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glistcnt--;
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if (s->owner) {
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s->owner->stream = NULL;
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if (s->owner->streamid > -1)
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ast_sched_del(s->owner->sched, s->owner->streamid);
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s->owner->streamid = -1;
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}
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pthread_mutex_unlock(&pcm_lock);
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ast_update_use_count();
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if (!tmp)
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ast_log(LOG_WARNING, "Freeing a filestream we don't seem to own\n");
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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 int ast_read_callback(void *data)
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{
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int retval = 0;
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int res;
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int delay;
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struct ast_filestream *s = data;
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struct timeval tv;
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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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s->owner->streamid = -1;
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return 0;
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}
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s->fr.samples = res;
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s->fr.datalen = res;
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delay = s->fr.samples/8;
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/* Lastly, process the frame */
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if (ast_write(s->owner, &s->fr)) {
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ast_log(LOG_WARNING, "Failed to write frame\n");
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s->owner->streamid = -1;
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return 0;
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}
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if (s->last.tv_usec || s->last.tv_usec) {
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int ms;
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gettimeofday(&tv, NULL);
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ms = 1000 * (tv.tv_sec - s->last.tv_sec) +
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(tv.tv_usec - s->last.tv_usec) / 1000;
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s->last.tv_sec = tv.tv_sec;
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s->last.tv_usec = tv.tv_usec;
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if ((ms - delay) * (ms - delay) > 4) {
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/* Compensate if we're more than 2 ms off */
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s->adj -= (ms - delay);
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}
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#if 0
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fprintf(stdout, "Delay is %d, adjustment is %d, last was %d\n", delay, s->adj, ms);
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#endif
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delay += s->adj;
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if (delay < 1)
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delay = 1;
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} else
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gettimeofday(&s->last, NULL);
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if (s->lasttimeout != delay) {
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/* We'll install the next timeout now. */
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s->owner->streamid = ast_sched_add(s->owner->sched,
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delay, ast_read_callback, s);
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s->lasttimeout = delay;
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} else {
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/* Just come back again at the same time */
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retval = -1;
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}
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return retval;
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}
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static int pcm_apply(struct ast_channel *c, struct ast_filestream *s)
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{
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/* Select our owner for this stream, and get the ball rolling. */
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s->owner = c;
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return 0;
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}
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static int pcm_play(struct ast_filestream *s)
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{
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ast_read_callback(s);
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return 0;
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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,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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if(whence == SEEK_CUR)
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offset = sample_offset + cur;
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if(whence == SEEK_END)
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offset = max - sample_offset;
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offset = (offset > max)?max:offset;
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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_apply,
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pcm_play,
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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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struct ast_filestream *tmp, *tmpl;
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if (pthread_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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tmp = glist;
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while(tmp) {
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if (tmp->owner)
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ast_softhangup(tmp->owner, AST_SOFTHANGUP_APPUNLOAD);
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tmpl = tmp;
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tmp = tmp->next;
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free(tmpl);
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}
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pthread_mutex_unlock(&pcm_lock);
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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 (pthread_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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pthread_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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