Largely simplify format handlers (for file copy etc.)
[asterisk/asterisk.git] / formats / format_gsm.c
index c6ef31f..3a27a11 100644 (file)
@@ -50,6 +50,9 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 
 /* Portions of the conversion code are by guido@sienanet.it */
 
+#define        GSM_FRAME_SIZE  33
+#define        GSM_SAMPLES     160
+
 /* silent gsm frame */
 /* begin binary data: */
 char gsm_silence[] = /* 33 */
@@ -58,111 +61,28 @@ char gsm_silence[] = /* 33 */
 ,0x92,0x49,0x24};
 /* end binary data. size = 33 bytes */
 
-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 */
-       FILE *f; /* Descriptor */
-       struct ast_frame fr;                            /* Frame information */
-       char waste[AST_FRIENDLY_OFFSET];        /* Buffer for sending frames, etc */
-       char empty;                                                     /* Empty character */
-       unsigned char gsm[66];                          /* Two Real GSM Frames */
-};
-
-
-AST_MUTEX_DEFINE_STATIC(gsm_lock);
-static int glistcnt = 0;
-
-static char *name = "gsm";
-static char *desc = "Raw GSM data";
-static char *exts = "gsm";
-
-static struct ast_filestream *gsm_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
-          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_mutex_lock(&gsm_lock)) {
-                       ast_log(LOG_WARNING, "Unable to lock gsm list\n");
-                       free(tmp);
-                       return NULL;
-               }
-               tmp->f = f;
-               tmp->fr.data = tmp->gsm;
-               tmp->fr.frametype = AST_FRAME_VOICE;
-               tmp->fr.subclass = AST_FORMAT_GSM;
-               /* datalen will vary for each frame */
-               tmp->fr.src = name;
-               tmp->fr.mallocd = 0;
-               glistcnt++;
-               ast_mutex_unlock(&gsm_lock);
-               ast_update_use_count();
-       }
-       return tmp;
-}
-
-static struct ast_filestream *gsm_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
-          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_mutex_lock(&gsm_lock)) {
-                       ast_log(LOG_WARNING, "Unable to lock gsm list\n");
-                       free(tmp);
-                       return NULL;
-               }
-               tmp->f = f;
-               glistcnt++;
-               ast_mutex_unlock(&gsm_lock);
-               ast_update_use_count();
-       } else
-               ast_log(LOG_WARNING, "Out of memory\n");
-       return tmp;
-}
-
-static void gsm_close(struct ast_filestream *s)
-{
-       if (ast_mutex_lock(&gsm_lock)) {
-               ast_log(LOG_WARNING, "Unable to lock gsm list\n");
-               return;
-       }
-       glistcnt--;
-       ast_mutex_unlock(&gsm_lock);
-       ast_update_use_count();
-       fclose(s->f);
-       free(s);
-}
-
 static struct ast_frame *gsm_read(struct ast_filestream *s, int *whennext)
 {
        int res;
+
        s->fr.frametype = AST_FRAME_VOICE;
        s->fr.subclass = AST_FORMAT_GSM;
-       s->fr.offset = AST_FRIENDLY_OFFSET;
-       s->fr.samples = 160;
-       s->fr.datalen = 33;
+       FR_SET_BUF(&(s->fr), s->buf, AST_FRIENDLY_OFFSET, GSM_FRAME_SIZE)
        s->fr.mallocd = 0;
-       s->fr.data = s->gsm;
-       if ((res = fread(s->gsm, 1, 33, s->f)) != 33) {
+       if ((res = fread(s->fr.data, 1, GSM_FRAME_SIZE, s->f)) != GSM_FRAME_SIZE) {
                if (res)
                        ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
                return NULL;
        }
-       *whennext = 160;
+       *whennext = s->fr.samples = GSM_SAMPLES;
        return &s->fr;
 }
 
 static int gsm_write(struct ast_filestream *fs, struct ast_frame *f)
 {
        int res;
-       unsigned char gsm[66];
+       unsigned char gsm[2*GSM_FRAME_SIZE];
+
        if (f->frametype != AST_FRAME_VOICE) {
                ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
                return -1;
@@ -176,14 +96,14 @@ static int gsm_write(struct ast_filestream *fs, struct ast_frame *f)
                int len=0;
                while(len < f->datalen) {
                        conv65(f->data + len, gsm);
-                       if ((res = fwrite(gsm, 1, 66, fs->f)) != 66) {
+                       if ((res = fwrite(gsm, 1, 2*GSM_FRAME_SIZE, fs->f)) != 2*GSM_FRAME_SIZE) {
                                ast_log(LOG_WARNING, "Bad write (%d/66): %s\n", res, strerror(errno));
                                return -1;
                        }
                        len += 65;
                }
        } else {
-               if (f->datalen % 33) {
+               if (f->datalen % GSM_FRAME_SIZE) {
                        ast_log(LOG_WARNING, "Invalid data length, %d, should be multiple of 33\n", f->datalen);
                        return -1;
                }
@@ -204,7 +124,7 @@ static int gsm_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
        fseeko(fs->f, 0, SEEK_END);
        max = ftello(fs->f);
        /* have to fudge to frame here, so not fully to sample */
-       distance = (sample_offset/160) * 33;
+       distance = (sample_offset/GSM_SAMPLES) * GSM_FRAME_SIZE;
        if(whence == SEEK_SET)
                offset = distance;
        else if(whence == SEEK_CUR || whence == SEEK_FORCECUR)
@@ -218,8 +138,8 @@ static int gsm_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
        } else if (offset > max) {
                int i;
                fseeko(fs->f, 0, SEEK_END);
-               for (i=0; i< (offset - max) / 33; i++) {
-                       fwrite(gsm_silence, 1, 33, fs->f);
+               for (i=0; i< (offset - max) / GSM_FRAME_SIZE; i++) {
+                       fwrite(gsm_silence, 1, GSM_FRAME_SIZE, fs->f);
                }
        }
        return fseeko(fs->f, offset, SEEK_SET);
@@ -232,48 +152,45 @@ static int gsm_trunc(struct ast_filestream *fs)
 
 static off_t gsm_tell(struct ast_filestream *fs)
 {
-       off_t offset;
-       offset = ftello(fs->f);
-       return (offset/33)*160;
+       off_t offset = ftello(fs->f);
+       return (offset/GSM_FRAME_SIZE)*GSM_SAMPLES;
 }
 
-static char *gsm_getcomment(struct ast_filestream *s)
-{
-       return NULL;
-}
+static struct ast_format_lock me = { .usecnt = -1 };
+
+static const struct ast_format gsm_f = {
+       .name = "gsm",
+       .exts = "gsm",
+       .format = AST_FORMAT_GSM,
+       .write = gsm_write,
+       .seek = gsm_seek,
+       .trunc = gsm_trunc,
+       .tell = gsm_tell,
+       .read = gsm_read,
+       .buf_size = 2*GSM_FRAME_SIZE + AST_FRIENDLY_OFFSET,     /* 2 gsm frames */
+       .lockp = &me,
+};
 
 int load_module()
 {
-       return ast_format_register(name, exts, AST_FORMAT_GSM,
-                                                               gsm_open,
-                                                               gsm_rewrite,
-                                                               gsm_write,
-                                                               gsm_seek,
-                                                               gsm_trunc,
-                                                               gsm_tell,
-                                                               gsm_read,
-                                                               gsm_close,
-                                                               gsm_getcomment);
-                                                               
-                                                               
+       return ast_format_register(&gsm_f);
 }
 
 int unload_module()
 {
-       return ast_format_unregister(name);
+       return ast_format_unregister(gsm_f.name);
 }      
 
 int usecount()
 {
-       return glistcnt;
+       return me.usecnt;
 }
 
 char *description()
 {
-       return desc;
+       return "Raw GSM data";
 }
 
-
 char *key()
 {
        return ASTERISK_GPL_KEY;