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0432826950
This commit:
1. Reads the WebM and Matroska ContentEncryption subelements.
2. Creates a GST_PROTECTION event for each ContentEncryption, which
will be sent before pushing the first source buffer.
The DRM system id field in this event is set to GST_PROTECTION_UNSPECIFIED_SYSTEM_ID,
because it isn't specified neither by Matroska nor by the WebM spec.
3. Reads the protection information of encrypted Block/SimpleBlock and
extracts the IV and the partitioning format (subsamples).
4. Creates the metadata protection for each encrypted Block/SimpleBlock,
with those informations: KeyID (extracted from ContentEncryption element),
IV and partitioning format.
5. Adds a new caps for WebM encrypted content named "application/x-webm-enc",
with the following new fields:
"encryption-algorithm": The encryption algorithm used.
values: "None", "DES", "3DES", "Twofish", "Blowfish", "AES".
"encoding-scope": The field that describes which Elements have been modified.
Values: "frame", "codec-data", "next-content".
"cipher-mode": The cipher mode used in the encryption.
Values: "None", "CTR".
https://bugzilla.gnome.org/show_bug.cgi?id=765275
175 lines
6.6 KiB
C
175 lines
6.6 KiB
C
/* GStreamer Matroska muxer/demuxer
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* (c) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
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* (c) 2011 Debarshi Ray <rishi@gnu.org>
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*
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* matroska-read-common.h: shared by matroska file/stream demuxer and parser
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __GST_MATROSKA_READ_COMMON_H__
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#define __GST_MATROSKA_READ_COMMON_H__
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#include <glib.h>
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#include <gst/gst.h>
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#include <gst/base/gstadapter.h>
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#include "matroska-ids.h"
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G_BEGIN_DECLS
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GST_DEBUG_CATEGORY_EXTERN(matroskareadcommon_debug);
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typedef enum {
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GST_MATROSKA_READ_STATE_START,
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GST_MATROSKA_READ_STATE_SEGMENT,
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GST_MATROSKA_READ_STATE_HEADER,
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GST_MATROSKA_READ_STATE_DATA,
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GST_MATROSKA_READ_STATE_SEEK,
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GST_MATROSKA_READ_STATE_SCANNING
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} GstMatroskaReadState;
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typedef struct _GstMatroskaReadCommon {
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#if 0
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GstIndex *element_index;
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gint element_index_writer_id;
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#endif
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/* pads */
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GstPad *sinkpad;
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GPtrArray *src;
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guint num_streams;
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/* metadata */
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gchar *muxing_app;
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gchar *writing_app;
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gint64 created;
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/* state */
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GstMatroskaReadState state;
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/* stream type */
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gboolean is_webm;
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gboolean has_video;
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/* did we parse cues/tracks/segmentinfo already? */
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gboolean index_parsed;
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gboolean segmentinfo_parsed;
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gboolean attachments_parsed;
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gboolean chapters_parsed;
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GList *tags_parsed;
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/* chapters stuff */
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/* Internal toc is used to keep track of the internal UID
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* which are different from the external StringUID used
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* in the user toc */
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GstToc *toc;
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GstToc *internal_toc;
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gboolean toc_updated;
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/* start-of-segment and length */
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guint64 ebml_segment_start;
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guint64 ebml_segment_length;
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/* a cue (index) table */
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GArray *index;
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/* timescale in the file */
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guint64 time_scale;
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/* keeping track of playback position */
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GstSegment segment;
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GstTagList *global_tags;
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gboolean global_tags_changed;
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/* pull mode caching */
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GstBuffer *cached_buffer;
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guint8 *cached_data;
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GstMapInfo cached_map;
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/* push and pull mode */
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guint64 offset;
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guint64 start_resync_offset;
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/* state to restore after scanning for invalid data */
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gint state_to_restore;
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/* push based mode usual suspects */
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GstAdapter *adapter;
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/* cache for track tags that forward-reference their tracks */
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GHashTable *cached_track_taglists ;
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} GstMatroskaReadCommon;
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GstFlowReturn gst_matroska_decode_content_encodings (GArray * encodings);
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gboolean gst_matroska_decode_data (GArray * encodings, gpointer * data_out,
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gsize * size_out, GstMatroskaTrackEncodingScope scope, gboolean free);
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gboolean
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gst_matroska_parse_protection_meta (gpointer * data_out, gsize * size_out,
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GstStructure * info_protect, gboolean * encrypted);
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gint gst_matroska_index_seek_find (GstMatroskaIndex * i1, GstClockTime * time,
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gpointer user_data);
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GstMatroskaIndex * gst_matroska_read_common_do_index_seek (
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GstMatroskaReadCommon * common, GstMatroskaTrackContext * track, gint64
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seek_pos, GArray ** _index, gint * _entry_index, GstSearchMode snap_dir);
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void gst_matroska_read_common_found_global_tag (GstMatroskaReadCommon * common,
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GstElement * el, GstTagList * taglist);
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gint64 gst_matroska_read_common_get_length (GstMatroskaReadCommon * common);
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GstMatroskaTrackContext * gst_matroska_read_common_get_seek_track (
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GstMatroskaReadCommon * common, GstMatroskaTrackContext * track);
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GstFlowReturn gst_matroska_read_common_parse_index (GstMatroskaReadCommon *
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common, GstEbmlRead * ebml);
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GstFlowReturn gst_matroska_read_common_parse_info (GstMatroskaReadCommon *
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common, GstElement * el, GstEbmlRead * ebml);
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GstFlowReturn gst_matroska_read_common_parse_attachments (
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GstMatroskaReadCommon * common, GstElement * el, GstEbmlRead * ebml);
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GstFlowReturn gst_matroska_read_common_parse_chapters (GstMatroskaReadCommon *
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common, GstEbmlRead * ebml);
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GstFlowReturn gst_matroska_read_common_parse_header (GstMatroskaReadCommon *
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common, GstEbmlRead * ebml);
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GstFlowReturn gst_matroska_read_common_parse_metadata (GstMatroskaReadCommon *
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common, GstElement * el, GstEbmlRead * ebml);
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GstFlowReturn gst_matroska_read_common_parse_skip (GstMatroskaReadCommon *
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common, GstEbmlRead * ebml, const gchar * parent_name, guint id);
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GstFlowReturn gst_matroska_read_common_peek_bytes (GstMatroskaReadCommon *
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common, guint64 offset, guint size, GstBuffer ** p_buf, guint8 ** bytes);
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GstFlowReturn gst_matroska_read_common_peek_id_length_pull (GstMatroskaReadCommon *
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common, GstElement * el, guint32 * _id, guint64 * _length, guint *
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_needed);
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GstFlowReturn gst_matroska_read_common_peek_id_length_push (GstMatroskaReadCommon *
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common, GstElement * el, guint32 * _id, guint64 * _length, guint *
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_needed);
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gint gst_matroska_read_common_stream_from_num (GstMatroskaReadCommon * common,
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guint track_num);
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GstFlowReturn gst_matroska_read_common_read_track_encodings (
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GstMatroskaReadCommon * common, GstEbmlRead * ebml,
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GstMatroskaTrackContext * context);
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void gst_matroska_read_common_reset_streams (GstMatroskaReadCommon * common,
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GstClockTime time, gboolean full);
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void gst_matroska_read_common_free_parsed_el (gpointer mem, gpointer user_data);
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void gst_matroska_read_common_init (GstMatroskaReadCommon * ctx);
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void gst_matroska_read_common_finalize (GstMatroskaReadCommon * ctx);
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void gst_matroska_read_common_reset (GstElement * element,
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GstMatroskaReadCommon * ctx);
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gboolean gst_matroska_read_common_tracknumber_unique (GstMatroskaReadCommon *
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common, guint64 num);
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G_END_DECLS
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#endif /* __GST_MATROSKA_READ_COMMON_H__ */
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