format_gsm.c: Added mime type

Sometimes it's impossible to get a file extension from URL
(eg. http://example.com/gsm/your) so we have to rely on content-type header.
Currenly, asterisk does not support content-type for gsm format(unlike wav).
Added audio/gsm according to https://www.rfc-editor.org/rfc/rfc4856.html

(cherry picked from commit 877449ddf5031997a19e32f7450c41550e3a36fa)

diff --git a/formats/format_gsm.c b/formats/format_gsm.c
index 48699b6ac5ee089ffbb84050e5db6fcfda5c2955..87157eae3f03538f3351324ce725344022e2530c 100644 (file)
--- a/formats/format_gsm.c
+++ b/formats/format_gsm.c
@@ -174,6 +174,7 @@ static off_t gsm_tell(struct ast_filestream *fs)
 static struct ast_format_def gsm_f = {
        .name = "gsm",
        .exts = "gsm",
+       .mime_types = "audio/gsm",
        .write = gsm_write,
        .seek = gsm_seek,
        .trunc = gsm_trunc,