Merged revisions 48107 via svnmerge from
[asterisk/asterisk.git] / formats / format_g729.c
old mode 100755 (executable)
new mode 100644 (file)
index 5d4aeab..3f46bcb
 /*
- * Asterisk -- A telephony toolkit for Linux.
+ * Asterisk -- An open source telephony toolkit.
  *
- * Save to raw, headerless G729 data.
- * 
- * Copyright (C) 1999, Mark Spencer
+ * Copyright (C) 1999 - 2005, Digium, Inc.
  *
- * Mark Spencer <markster@linux-support.net>
+ * Mark Spencer <markster@digium.com>
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
  *
  * This program is free software, distributed under the terms of
- * the GNU General Public License
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+
+/*! \file
+ *
+ * \brief Save to raw, headerless G729 data.
+ * \note This is not an encoder/decoder. The codec fo g729 is only
+ * available with a commercial license from Digium, due to patent
+ * restrictions. Check http://www.digium.com for information.
+ * \arg Extensions: g729 
+ * \ingroup formats
  */
  
-#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 "asterisk.h"
+
+ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
+
+#include <unistd.h>
+#include <netinet/in.h>
 #include <arpa/inet.h>
 #include <stdlib.h>
 #include <sys/time.h>
 #include <stdio.h>
-#include <unistd.h>
 #include <errno.h>
 #include <string.h>
-#include <pthread.h>
-#include <endian.h>
 
-/* Some Ideas for this code came from makeg729e.c by Jeffery Chilton */
-
-/* Portions of the conversion code are by guido@sienanet.it */
-
-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 g729[20];                         /* Two Real G729 Frames */
-       int lasttimeout;
-       struct timeval last;
-       int adj;
-       struct ast_filestream *next;
-};
+#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 "asterisk/endian.h"
 
+/* Some Ideas for this code came from makeg729e.c by Jeffrey Chilton */
 
-static struct ast_filestream *glist = NULL;
-static pthread_mutex_t g729_lock = AST_MUTEX_INITIALIZER;
-static int glistcnt = 0;
-
-static char *name = "g729";
-static char *desc = "Raw G729 data";
-static char *exts = "g729";
-
-static struct ast_filestream *g729_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 (ast_pthread_mutex_lock(&g729_lock)) {
-                       ast_log(LOG_WARNING, "Unable to lock g729 list\n");
-                       free(tmp);
-                       return NULL;
-               }
-               tmp->next = glist;
-               glist = tmp;
-               tmp->fd = fd;
-               tmp->owner = NULL;
-               tmp->fr.data = tmp->g729;
-               tmp->fr.frametype = AST_FRAME_VOICE;
-               tmp->fr.subclass = AST_FORMAT_G729A;
-               /* datalen will vary for each frame */
-               tmp->fr.src = name;
-               tmp->fr.mallocd = 0;
-               tmp->lasttimeout = -1;
-               glistcnt++;
-               ast_pthread_mutex_unlock(&g729_lock);
-               ast_update_use_count();
-       }
-       return tmp;
-}
-
-static struct ast_filestream *g729_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 (ast_pthread_mutex_lock(&g729_lock)) {
-                       ast_log(LOG_WARNING, "Unable to lock g729 list\n");
-                       free(tmp);
-                       return NULL;
-               }
-               tmp->next = glist;
-               glist = tmp;
-               tmp->fd = fd;
-               tmp->owner = NULL;
-               tmp->lasttimeout = -1;
-               glistcnt++;
-               ast_pthread_mutex_unlock(&g729_lock);
-               ast_update_use_count();
-       } else
-               ast_log(LOG_WARNING, "Out of memory\n");
-       return tmp;
-}
+/* Portions of the conversion code are by guido@sienanet.it */
 
-static struct ast_frame *g729_read(struct ast_filestream *s)
-{
-       return NULL;
-}
+#define        BUF_SIZE        20      /* two G729 frames */
+#define        G729A_SAMPLES   160
 
-static void g729_close(struct ast_filestream *s)
+static struct ast_frame *g729_read(struct ast_filestream *s, int *whennext)
 {
-       struct ast_filestream *tmp, *tmpl = NULL;
-       if (ast_pthread_mutex_lock(&g729_lock)) {
-               ast_log(LOG_WARNING, "Unable to lock g729 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;
-       }
-       ast_pthread_mutex_unlock(&g729_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 = 20;
-       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_G729A;
-       s->fr.offset = AST_FRIENDLY_OFFSET;
-       s->fr.samples = 160;
-       s->fr.datalen = 20;
        s->fr.mallocd = 0;
-       s->fr.data = s->g729;
-       if ((res = read(s->fd, s->g729, 20)) != 20) {
-               if (res)
+       s->fr.samples = G729A_SAMPLES;
+       AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
+       if ((res = fread(s->fr.data, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
+               if (res && (res != 10)) /* XXX what for ? */
                        ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
-               s->owner->streamid = -1;
-               return 0;
-       }
-       /* 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;
+               return NULL;
        }
-       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 g729_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 g729_play(struct ast_filestream *s)
-{
-       ast_read_callback(s);
-       return 0;
+       *whennext = s->fr.samples;
+       return &s->fr;
 }
 
 static int g729_write(struct ast_filestream *fs, struct ast_frame *f)
@@ -237,40 +83,39 @@ static int g729_write(struct ast_filestream *fs, struct ast_frame *f)
                ast_log(LOG_WARNING, "Asked to write non-G729 frame (%d)!\n", f->subclass);
                return -1;
        }
-       if (f->datalen % 20) {
-               ast_log(LOG_WARNING, "Invalid data length, %d, should be multiple of 20\n", f->datalen);
+       if (f->datalen % 10) {
+               ast_log(LOG_WARNING, "Invalid data length, %d, should be multiple of 10\n", f->datalen);
                return -1;
        }
-       if ((res = write(fs->fd, f->data, f->datalen)) != f->datalen) {
-                       ast_log(LOG_WARNING, "Bad write (%d/20): %s\n", res, strerror(errno));
+       if ((res = fwrite(f->data, 1, f->datalen, fs->f)) != f->datalen) {
+                       ast_log(LOG_WARNING, "Bad write (%d/10): %s\n", res, strerror(errno));
                        return -1;
        }
        return 0;
 }
 
-static char *g729_getcomment(struct ast_filestream *s)
-{
-       return NULL;
-}
-
-static int g729_seek(struct ast_filestream *fs, long sample_offset, int whence)
+static int g729_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
 {
        long bytes;
-       off_t min,cur,max,offset;
+       off_t min,cur,max,offset=0;
        min = 0;
-       cur = lseek(fs->fd, 0, SEEK_CUR);
-       max = lseek(fs->fd, 0, SEEK_END);
+       cur = ftello(fs->f);
+       fseeko(fs->f, 0, SEEK_END);
+       max = ftello(fs->f);
        
-       bytes = 20 * (sample_offset / 160);
-       if(whence == SEEK_SET)
+       bytes = BUF_SIZE * (sample_offset / G729A_SAMPLES);
+       if (whence == SEEK_SET)
                offset = bytes;
-       if(whence == SEEK_CUR)
+       else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
                offset = cur + bytes;
-       if(whence == SEEK_END)
+       else if (whence == SEEK_END)
                offset = max - bytes;
-       offset = (offset > max)?max:offset;
+       if (whence != SEEK_FORCECUR) {
+               offset = (offset > max)?max:offset;
+       }
+       /* protect against seeking beyond begining. */
        offset = (offset < min)?min:offset;
-       if (lseek(fs->fd, offset, SEEK_SET) < 0)
+       if (fseeko(fs->f, offset, SEEK_SET) < 0)
                return -1;
        return 0;
 }
@@ -278,74 +123,37 @@ static int g729_seek(struct ast_filestream *fs, long sample_offset, int whence)
 static int g729_trunc(struct ast_filestream *fs)
 {
        /* Truncate file to current length */
-       if (ftruncate(fs->fd, lseek(fs->fd, 0, SEEK_CUR)) < 0)
+       if (ftruncate(fileno(fs->f), ftello(fs->f)) < 0)
                return -1;
        return 0;
 }
 
-static long g729_tell(struct ast_filestream *fs)
-{
-       off_t offset;
-       offset = lseek(fs->fd, 0, SEEK_CUR);
-       return (offset/20)*160;
-}
-
-int load_module()
+static off_t g729_tell(struct ast_filestream *fs)
 {
-       return ast_format_register(name, exts, AST_FORMAT_G729A,
-                                                               g729_open,
-                                                               g729_rewrite,
-                                                               g729_apply,
-                                                               g729_play,
-                                                               g729_write,
-                                                               g729_seek,
-                                                               g729_trunc,
-                                                               g729_tell,
-                                                               g729_read,
-                                                               g729_close,
-                                                               g729_getcomment);
-                                                               
-                                                               
+       off_t offset = ftello(fs->f);
+       return (offset/BUF_SIZE)*G729A_SAMPLES;
 }
 
-int unload_module()
-{
-       struct ast_filestream *tmp, *tmpl;
-       if (ast_pthread_mutex_lock(&g729_lock)) {
-               ast_log(LOG_WARNING, "Unable to lock g729 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);
-       }
-       ast_pthread_mutex_unlock(&g729_lock);
-       return ast_format_unregister(name);
-}      
+static const struct ast_format g729_f = {
+       .name = "g729",
+       .exts = "g729",
+       .format = AST_FORMAT_G729A,
+       .write = g729_write,
+       .seek = g729_seek,
+       .trunc = g729_trunc,
+       .tell = g729_tell,
+       .read = g729_read,
+       .buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
+};
 
-int usecount()
+static int load_module(void)
 {
-       int res;
-       if (ast_pthread_mutex_lock(&g729_lock)) {
-               ast_log(LOG_WARNING, "Unable to lock g729 list\n");
-               return -1;
-       }
-       res = glistcnt;
-       ast_pthread_mutex_unlock(&g729_lock);
-       return res;
+       return ast_format_register(&g729_f);
 }
 
-char *description()
+static int unload_module(void)
 {
-       return desc;
-}
-
+       return ast_format_unregister(g729_f.name);
+}      
 
-char *key()
-{
-       return ASTERISK_GPL_KEY;
-}
+AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Raw G729 data");