Use FILE * instead of fd for files to support buffering
[asterisk/asterisk.git] / formats / format_pcm_alaw.c
index 52c3eee..c9efba1 100755 (executable)
@@ -54,7 +54,7 @@ struct ast_filestream {
        /* 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 */
+       FILE *f; /* Descriptor */
        struct ast_frame fr;                            /* Frame information */
        char waste[AST_FRIENDLY_OFFSET];        /* Buffer for sending frames, etc */
        char empty;                                                     /* Empty character */
@@ -90,7 +90,7 @@ static unsigned long get_time(void)
 }
 #endif
 
-static struct ast_filestream *pcm_open(int fd)
+static struct ast_filestream *pcm_open(FILE *f)
 {
        /* 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
@@ -103,7 +103,7 @@ static struct ast_filestream *pcm_open(int fd)
                        free(tmp);
                        return NULL;
                }
-               tmp->fd = fd;
+               tmp->f = f;
                tmp->fr.data = tmp->buf;
                tmp->fr.frametype = AST_FRAME_VOICE;
                tmp->fr.subclass = AST_FORMAT_ALAW;
@@ -120,7 +120,7 @@ static struct ast_filestream *pcm_open(int fd)
        return tmp;
 }
 
-static struct ast_filestream *pcm_rewrite(int fd, const char *comment)
+static struct ast_filestream *pcm_rewrite(FILE *f, const 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
@@ -133,7 +133,7 @@ static struct ast_filestream *pcm_rewrite(int fd, const char *comment)
                        free(tmp);
                        return NULL;
                }
-               tmp->fd = fd;
+               tmp->f = f;
 #ifdef REALTIME_WRITE
                tmp->start_time = get_time();
 #endif
@@ -154,7 +154,7 @@ static void pcm_close(struct ast_filestream *s)
        glistcnt--;
        ast_mutex_unlock(&pcm_lock);
        ast_update_use_count();
-       close(s->fd);
+       fclose(s->f);
        free(s);
        s = NULL;
 }
@@ -169,7 +169,7 @@ static struct ast_frame *pcm_read(struct ast_filestream *s, int *whennext)
        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 = fread(s->buf, 1, BUF_SIZE, s->f)) < 1) {
                if (res)
                        ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
                return NULL;
@@ -204,46 +204,41 @@ static int pcm_write(struct ast_filestream *fs, struct ast_frame *f)
        /* 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 )
-       {
+       
+       fstat(fileno(fs->f), &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 )
-       {
+       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 )
-               {
+               if (fseek(fs->f, 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 )
-               {
+               memset(buf, 0x55, 512);
+               while (cur < fpos) {
                        to_write = fpos - cur;
-                       if( to_write > 512 )
-                       {
+                       if (to_write > 512) {
                                to_write = 512;
                        }
-                       write( fs->fd, buf, to_write );
+                       fwrite(buf, 1, to_write, fs->f);
                        cur += to_write;
                }
        }
 
 
-       if( lseek( fs->fd, fpos, SEEK_SET ) < 0 )
-       {
+       if (fseek(s->f, 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) {
+       if ((res = fwrite(f->data, 1, f->datalen, fs->f)) != f->datalen) {
                        ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
                        return -1;
        }
@@ -255,8 +250,9 @@ static int pcm_seek(struct ast_filestream *fs, long sample_offset, int whence)
        off_t offset=0,min,cur,max;
 
        min = 0;
-       cur = lseek(fs->fd, 0, SEEK_CUR);
-       max = lseek(fs->fd, 0, SEEK_END);
+       cur = ftell(fs->f);
+       fseek(fs->f, 0, SEEK_END);
+       max = ftell(fs->f);
        if (whence == SEEK_SET)
                offset = sample_offset;
        else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
@@ -268,18 +264,18 @@ static int pcm_seek(struct ast_filestream *fs, long sample_offset, int whence)
        }
        /* Always protect against seeking past begining */
        offset = (offset < min)?min:offset;
-       return lseek(fs->fd, offset, SEEK_SET);
+       return fseek(fs->f, offset, SEEK_SET);
 }
 
 static int pcm_trunc(struct ast_filestream *fs)
 {
-       return ftruncate(fs->fd, lseek(fs->fd,0,SEEK_CUR));
+       return ftruncate(fileno(fs->f), ftell(fs->f));
 }
 
 static long pcm_tell(struct ast_filestream *fs)
 {
        off_t offset;
-       offset = lseek(fs->fd, 0, SEEK_CUR);
+       offset = ftell(fs->f);
        return offset;
 }