Add Mahmut's Alaw patch
authorMark Spencer <markster@digium.com>
Fri, 21 Mar 2003 04:25:13 +0000 (04:25 +0000)
committerMark Spencer <markster@digium.com>
Fri, 21 Mar 2003 04:25:13 +0000 (04:25 +0000)
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@672 65c4cc65-6c06-0410-ace0-fbb531ad65f3

formats/Makefile
formats/format_pcm_alaw.c [new file with mode: 0755]

index e615636..17a9195 100755 (executable)
@@ -11,7 +11,8 @@
 # the GNU General Public License
 #
 
-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
+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 format_pcm_alaw.so
 FORMAT_LIBS+=format_jpeg.so
 
 GSMLIB=../codecs/gsm/lib/libgsm.a
diff --git a/formats/format_pcm_alaw.c b/formats/format_pcm_alaw.c
new file mode 100755 (executable)
index 0000000..c7e1ef7
--- /dev/null
@@ -0,0 +1,418 @@
+/*
+ * Asterisk -- A telephony toolkit for Linux.
+ *
+ * Flat, binary, alaw PCM file format.
+ * 
+ * Copyright (C) 1999, Mark Spencer
+ *
+ * Mark Spencer <markster@linux-support.net>
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License
+ */
+#include <asterisk/lock.h>
+#include <asterisk/channel.h>
+#include <asterisk/file.h>
+#include <asterisk/logger.h>
+#include <asterisk/sched.h>
+#include <asterisk/module.h>
+#include <arpa/inet.h>
+#include <stdlib.h>
+#include <sys/time.h>
+#include <sys/times.h>
+#include <sys/types.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <pthread.h>
+#include <endian.h>
+
+#define BUF_SIZE 160           /* 160 samples */
+
+// #define REALTIME_WRITE
+
+struct ast_filestream {
+       void *reserved[AST_RESERVED_POINTERS];
+       /* Believe it or not, we must decode/recode to account for the
+          weird MS format */
+       /* This is what a filestream means to us */
+       int fd; /* Descriptor */
+       struct ast_channel *owner;
+       struct ast_frame fr;                            /* Frame information */
+       char waste[AST_FRIENDLY_OFFSET];        /* Buffer for sending frames, etc */
+       char empty;                                                     /* Empty character */
+       unsigned char buf[BUF_SIZE];                            /* Output Buffer */
+       int lasttimeout;
+       struct timeval last;
+#ifdef REALTIME_WRITE
+       unsigned long start_time;
+#endif
+       int adj;
+       struct ast_filestream *next;
+};
+
+
+static struct ast_filestream *glist = NULL;
+static pthread_mutex_t pcm_lock = AST_MUTEX_INITIALIZER;
+static int glistcnt = 0;
+
+static char *name = "alaw";
+static char *desc = "Raw aLaw 8khz PCM Audio support";
+static char *exts = "alaw|al";
+
+
+/* Returns time in msec since system boot. */
+static unsigned long get_time()
+{
+       struct tms buf;
+       clock_t cur;
+
+       cur = times( &buf );
+       if( cur < 0 )
+       {
+               ast_log( LOG_WARNING, "Cannot get current time\n" );
+               return 0;
+       }
+       return cur * 1000 / sysconf( _SC_CLK_TCK );
+}
+
+static struct ast_filestream *pcm_open(int fd)
+{
+       /* We don't have any header to read or anything really, but
+          if we did, it would go here.  We also might want to check
+          and be sure it's a valid file.  */
+       struct ast_filestream *tmp;
+       if ((tmp = malloc(sizeof(struct ast_filestream)))) {
+               memset(tmp, 0, sizeof(struct ast_filestream));
+               if (pthread_mutex_lock(&pcm_lock)) {
+                       ast_log(LOG_WARNING, "Unable to lock pcm list\n");
+                       free(tmp);
+                       return NULL;
+               }
+               tmp->next = glist;
+               glist = tmp;
+               tmp->fd = fd;
+               tmp->owner = NULL;
+               tmp->fr.data = tmp->buf;
+               tmp->fr.frametype = AST_FRAME_VOICE;
+               tmp->fr.subclass = AST_FORMAT_ALAW;
+               /* datalen will vary for each frame */
+               tmp->fr.src = name;
+               tmp->fr.mallocd = 0;
+               tmp->lasttimeout = -1;
+#ifdef REALTIME_WRITE
+               tmp->start_time = get_time();
+#endif
+               glistcnt++;
+               pthread_mutex_unlock(&pcm_lock);
+               ast_update_use_count();
+       }
+       return tmp;
+}
+
+static struct ast_filestream *pcm_rewrite(int fd, char *comment)
+{
+       /* We don't have any header to read or anything really, but
+          if we did, it would go here.  We also might want to check
+          and be sure it's a valid file.  */
+       struct ast_filestream *tmp;
+       if ((tmp = malloc(sizeof(struct ast_filestream)))) {
+               memset(tmp, 0, sizeof(struct ast_filestream));
+               if (pthread_mutex_lock(&pcm_lock)) {
+                       ast_log(LOG_WARNING, "Unable to lock pcm list\n");
+                       free(tmp);
+                       return NULL;
+               }
+               tmp->next = glist;
+               glist = tmp;
+               tmp->fd = fd;
+               tmp->owner = NULL;
+               tmp->lasttimeout = -1;
+#ifdef REALTIME_WRITE
+               tmp->start_time = get_time();
+#endif
+               glistcnt++;
+               pthread_mutex_unlock(&pcm_lock);
+               ast_update_use_count();
+       } else
+               ast_log(LOG_WARNING, "Out of memory\n");
+       return tmp;
+}
+
+static struct ast_frame *pcm_read(struct ast_filestream *s)
+{
+       return NULL;
+}
+
+static void pcm_close(struct ast_filestream *s)
+{
+       struct ast_filestream *tmp, *tmpl = NULL;
+       if (pthread_mutex_lock(&pcm_lock)) {
+               ast_log(LOG_WARNING, "Unable to lock pcm list\n");
+               return;
+       }
+       tmp = glist;
+       while(tmp) {
+               if (tmp == s) {
+                       if (tmpl)
+                               tmpl->next = tmp->next;
+                       else
+                               glist = tmp->next;
+                       break;
+               }
+               tmpl = tmp;
+               tmp = tmp->next;
+       }
+       glistcnt--;
+       if (s->owner) {
+               s->owner->stream = NULL;
+               if (s->owner->streamid > -1)
+                       ast_sched_del(s->owner->sched, s->owner->streamid);
+               s->owner->streamid = -1;
+       }
+       pthread_mutex_unlock(&pcm_lock);
+       ast_update_use_count();
+       if (!tmp) 
+               ast_log(LOG_WARNING, "Freeing a filestream we don't seem to own\n");
+       close(s->fd);
+       free(s);
+       s = NULL;
+}
+
+static int ast_read_callback(void *data)
+{
+       int retval = 0;
+       int res;
+       int delay;
+       struct ast_filestream *s = data;
+       struct timeval tv;
+       /* Send a frame from the file to the appropriate channel */
+
+       s->fr.frametype = AST_FRAME_VOICE;
+       s->fr.subclass = AST_FORMAT_ALAW;
+       s->fr.offset = AST_FRIENDLY_OFFSET;
+       s->fr.mallocd = 0;
+       s->fr.data = s->buf;
+       if ((res = read(s->fd, s->buf, BUF_SIZE)) < 1) {
+               if (res)
+                       ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
+               s->owner->streamid = -1;
+               return 0;
+       }
+       s->fr.samples = res;
+       s->fr.datalen = res;
+       delay = s->fr.samples/8;
+       /* Lastly, process the frame */
+       if (ast_write(s->owner, &s->fr)) {
+               ast_log(LOG_WARNING, "Failed to write frame\n");
+               s->owner->streamid = -1;
+               return 0;
+       }
+       if (s->last.tv_usec || s->last.tv_usec) {
+               int ms;
+               gettimeofday(&tv, NULL);
+               ms = 1000 * (tv.tv_sec - s->last.tv_sec) + 
+                       (tv.tv_usec - s->last.tv_usec) / 1000;
+               s->last.tv_sec = tv.tv_sec;
+               s->last.tv_usec = tv.tv_usec;
+               if ((ms - delay) * (ms - delay) > 4) {
+                       /* Compensate if we're more than 2 ms off */
+                       s->adj -= (ms - delay);
+               }
+#if 0
+               fprintf(stdout, "Delay is %d, adjustment is %d, last was %d\n", delay, s->adj, ms);
+#endif
+               delay += s->adj;
+               if (delay < 1)
+                       delay = 1;
+       } else
+               gettimeofday(&s->last, NULL);
+       if (s->lasttimeout != delay) {
+               /* We'll install the next timeout now. */
+               s->owner->streamid = ast_sched_add(s->owner->sched,
+                               delay, ast_read_callback, s); 
+               s->lasttimeout = delay;
+       } else {
+               /* Just come back again at the same time */
+               retval = -1;
+       }
+       return retval;
+}
+
+static int pcm_apply(struct ast_channel *c, struct ast_filestream *s)
+{
+       /* Select our owner for this stream, and get the ball rolling. */
+       s->owner = c;
+       return 0;
+}
+
+static int pcm_play(struct ast_filestream *s)
+{
+       ast_read_callback(s);
+       return 0;
+}
+
+static int pcm_write(struct ast_filestream *fs, struct ast_frame *f)
+{
+       int res;
+#ifdef REALTIME_WRITE
+       unsigned long cur_time;
+       unsigned long fpos;
+       struct stat stat_buf;
+#endif
+
+       if (f->frametype != AST_FRAME_VOICE) {
+               ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
+               return -1;
+       }
+       if (f->subclass != AST_FORMAT_ALAW) {
+               ast_log(LOG_WARNING, "Asked to write non-alaw frame (%d)!\n", f->subclass);
+               return -1;
+       }
+
+#ifdef REALTIME_WRITE
+       cur_time = get_time();
+       fpos = ( cur_time - fs->start_time ) * 8;       // 8 bytes per msec
+       // Check if we have written to this position yet. If we have, then increment pos by one frame
+       // for some degree of protection against receiving packets in the same clock tick.
+       fstat( fs->fd, &stat_buf );
+       if( stat_buf.st_size > fpos )
+       {
+               fpos += f->datalen;     // Incrementing with the size of this current frame
+       }
+
+       if( stat_buf.st_size < fpos )
+       {
+               // fill the gap with 0x55 rather than 0.
+               char buf[ 512 ];
+               unsigned long cur, to_write;
+
+               cur = stat_buf.st_size;
+               if( lseek( fs->fd, cur, SEEK_SET ) < 0 )
+               {
+                       ast_log( LOG_WARNING, "Cannot seek in file: %s\n", strerror(errno) );
+                       return -1;
+               }
+               memset( buf, 0x55, 512 );
+               while( cur < fpos )
+               {
+                       to_write = fpos - cur;
+                       if( to_write > 512 )
+                       {
+                               to_write = 512;
+                       }
+                       write( fs->fd, buf, to_write );
+                       cur += to_write;
+               }
+       }
+
+
+       if( lseek( fs->fd, fpos, SEEK_SET ) < 0 )
+       {
+               ast_log( LOG_WARNING, "Cannot seek in file: %s\n", strerror(errno) );
+               return -1;
+       }
+#endif // REALTIME_WRITE
+       
+       if ((res = write(fs->fd, f->data, f->datalen)) != f->datalen) {
+                       ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
+                       return -1;
+       }
+       return 0;
+}
+
+static int pcm_seek(struct ast_filestream *fs, long sample_offset, int whence)
+{
+       off_t offset,min,cur,max;
+
+       min = 0;
+       cur = lseek(fs->fd, 0, SEEK_CUR);
+       max = lseek(fs->fd, 0, SEEK_END);
+       if(whence == SEEK_SET)
+               offset = sample_offset;
+       if(whence == SEEK_CUR)
+               offset = sample_offset + cur;
+       if(whence == SEEK_END)
+               offset = max - sample_offset;
+       offset = (offset > max)?max:offset;
+       offset = (offset < min)?min:offset;
+       return lseek(fs->fd, offset, SEEK_SET);
+}
+
+static int pcm_trunc(struct ast_filestream *fs)
+{
+       return ftruncate(fs->fd, lseek(fs->fd,0,SEEK_CUR));
+}
+
+static long pcm_tell(struct ast_filestream *fs)
+{
+       off_t offset;
+       offset = lseek(fs->fd, 0, SEEK_CUR);
+       return offset;
+}
+
+
+static char *pcm_getcomment(struct ast_filestream *s)
+{
+       return NULL;
+}
+
+int load_module()
+{
+       return ast_format_register(name, exts, AST_FORMAT_ALAW,
+                                                               pcm_open,
+                                                               pcm_rewrite,
+                                                               pcm_apply,
+                                                               pcm_play,
+                                                               pcm_write,
+                                                               pcm_seek,
+                                                               pcm_trunc,
+                                                               pcm_tell,
+                                                               pcm_read,
+                                                               pcm_close,
+                                                               pcm_getcomment);
+}
+
+int unload_module()
+{
+       struct ast_filestream *tmp, *tmpl;
+       if (pthread_mutex_lock(&pcm_lock)) {
+               ast_log(LOG_WARNING, "Unable to lock pcm list\n");
+               return -1;
+       }
+       tmp = glist;
+       while(tmp) {
+               if (tmp->owner)
+                       ast_softhangup(tmp->owner, AST_SOFTHANGUP_APPUNLOAD);
+               tmpl = tmp;
+               tmp = tmp->next;
+               free(tmpl);
+       }
+       pthread_mutex_unlock(&pcm_lock);
+       return ast_format_unregister(name);
+}      
+
+int usecount()
+{
+       int res;
+       if (pthread_mutex_lock(&pcm_lock)) {
+               ast_log(LOG_WARNING, "Unable to lock pcm list\n");
+               return -1;
+       }
+       res = glistcnt;
+       pthread_mutex_unlock(&pcm_lock);
+       return res;
+}
+
+char *description()
+{
+       return desc;
+}
+
+
+char *key()
+{
+       return ASTERISK_GPL_KEY;
+}