Steve Lhomme pushed to branch master at VideoLAN / VLC
Commits:
272b3f85 by Rémi Denis-Courmont at 2024-01-15T18:59:09+02:00
decomp: add Zstandard support
- - - - -
2 changed files:
- NEWS
- modules/stream_filter/decomp.c
Changes:
=====================================
NEWS
=====================================
@@ -69,6 +69,7 @@ Access:
* Deprecates Audio CD CDDB lookups in favor of more accurate Musicbrainz
* Improved CD-TEXT and added Shift-JIS encoding support
* Support for YoutubeDL (where available).
+ * On-the-fly Zstandard (zstd) file decompression (where available).
Access output:
* Added support for the RIST (Reliable Internet Stream Transport) Protocol
=====================================
modules/stream_filter/decomp.c
=====================================
@@ -46,12 +46,17 @@
static int OpenGzip (vlc_object_t *);
static int OpenBzip2 (vlc_object_t *);
static int OpenXZ (vlc_object_t *);
+static int OpenZstd(vlc_object_t *);
static void Close (vlc_object_t *);
vlc_module_begin ()
set_subcategory (SUBCAT_INPUT_STREAM_FILTER)
set_capability ("stream_filter", 320)
+ set_description (N_("Zstandard decompression"))
+ set_callbacks (OpenZstd, Close)
+
+ add_submodule ()
set_description (N_("LZMA decompression"))
set_callbacks (OpenXZ, Close)
@@ -396,3 +401,23 @@ static int OpenXZ (vlc_object_t *obj)
msg_Dbg (obj, "detected xz compressed stream");
return Open (stream, "xzcat");
}
+
+/**
+ * Detects zstd file format
+ */
+static int OpenZstd(vlc_object_t *obj)
+{
+ stream_t *stream = (stream_t *)obj;
+ const uint8_t *peek;
+
+ /* (Try to) parse the Zstd frame header (minimum size is 6 bytes) */
+ if (vlc_stream_Peek(stream->s, &peek, 6) < 6)
+ return VLC_ENOTSUP;
+ if (memcmp(peek, "\x28\xb5\x2f\xfd", 4)) /* magic number */
+ return VLC_ENOTSUP;
+ if (peek[4] & 0x08) /* reserved bit */
+ return VLC_ENOTSUP;
+
+ msg_Dbg(obj, "detected zstd compressed stream");
+ return Open(stream, "zstdcat");
+}
View it on GitLab:
https://code.videolan.org/videolan/vlc/-/commit/272b3f85f474180b19ec17ab6e1b53ab4dddbc43
--
View it on GitLab:
https://code.videolan.org/videolan/vlc/-/commit/272b3f85f474180b19ec17ab6e1b53ab4dddbc43
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