codecparsers: Add Mpeg Video GstMeta

This can be used by parsers to provide pre-parsed information to
downstream elements that would require it (so they can avoid having
to parse the bitstream again).

1 files changed, 87 insertions, 0 deletions

diff --git a/gst-libs/gst/codecparsers/gstmpegvideometa.h b/gst-libs/gst/codecparsers/gstmpegvideometa.h
new file mode 100644
index 000000000..fd4e7245e
--- /dev/null
+++ b/gst-libs/gst/codecparsers/gstmpegvideometa.h
@@ -0,0 +1,87 @@
+/* Gstreamer
+ * Copyright (C) <2012> Edward Hervey <edward@collabora.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __GST_MPEG_VIDEO_META_H__
+#define __GST_MPEG_VIDEO_META_H__
+
+#ifndef GST_USE_UNSTABLE_API
+#warning "The Mpeg video parsing library is unstable API and may change in future."
+#warning "You can define GST_USE_UNSTABLE_API to avoid this warning."
+#endif
+
+#include <gst/gst.h>
+#include <gst/codecparsers/gstmpegvideoparser.h>
+
+G_BEGIN_DECLS
+
+typedef struct _GstMpegVideoMeta GstMpegVideoMeta;
+
+GType gst_mpeg_video_meta_api_get_type (void);
+#define GST_MPEG_VIDEO_META_API_TYPE  (gst_mpeg_video_meta_api_get_type())
+#define GST_MPEG_VIDEO_META_INFO  (gst_mpeg_video_meta_get_info())
+const GstMetaInfo * gst_mpeg_video_meta_get_info (void);
+
+/**
+ * GstMpegVideoMeta:
+ * @meta: parent #GstMeta
+ * @sequencehdr: the #GstMpegVideoSequenceHdr if present in the buffer
+ * @sequenceext: the #GstMpegVideoSequenceExt if present in the buffer
+ * @sequencedispext: the #GstMpegVideoSequenceDisplayExt if present in the
+ * buffer.
+ * @pichdr: the #GstMpegVideoPictureHdr if present in the buffer.
+ * @picext: the #GstMpegVideoPictureExt if present in the buffer.
+ * @quantext: the #GstMpegVideoQuantMatrixExt if present in the buffer
+ *
+ * Extra buffer metadata describing the contents of a MPEG1/2 Video frame
+ *
+ * Can be used by elements (mainly decoders) to avoid having to parse
+ * Mpeg video 1/2 packets if it can be done upstream.
+ *
+ * The various fields are only valid during the lifetime of the #GstH264Meta.
+ * If elements wish to use those for longer, they are required to make a copy.
+ */
+struct _GstMpegVideoMeta {
+  GstMeta            meta;
+
+  GstMpegVideoSequenceHdr        *sequencehdr;
+  GstMpegVideoSequenceExt        *sequenceext;
+  GstMpegVideoSequenceDisplayExt *sequencedispext;
+  GstMpegVideoPictureHdr         *pichdr;
+  GstMpegVideoPictureExt         *picext;
+  GstMpegVideoQuantMatrixExt     *quantext;
+
+  guint	num_slices;
+  gsize slice_offset;
+};
+
+
+#define gst_buffer_get_mpeg_video_meta(b) ((GstMpegVideoMeta*)gst_buffer_get_meta((b),GST_MPEG_VIDEO_META_API_TYPE))
+
+GstMpegVideoMeta *
+gst_buffer_add_mpeg_video_meta (GstBuffer * buffer, 
+				const GstMpegVideoSequenceHdr *seq_hdr,
+				const GstMpegVideoSequenceExt *seq_ext,
+				const GstMpegVideoSequenceDisplayExt *disp_ext,
+				const GstMpegVideoPictureHdr *pic_hdr,
+				const GstMpegVideoPictureExt *pic_ext,
+				const GstMpegVideoQuantMatrixExt *quant_ext);
+
+G_END_DECLS
+
+#endif