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gst/: Add more docs regarding tag merge-modes and when to send tags. Fix 'since' statement for new tag.

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Original commit message from CVS:
* gst/gsttaglist.h:
* gst/gsttagsetter.c:
Add more docs regarding tag merge-modes and when to send tags. Fix 'since'
statement for new tag.
This commit is contained in:
Stefan Kost 2007-01-18 12:00:23 +00:00
parent 4e07e925a5
commit 2d88cb7e88
3 changed files with 79 additions and 4 deletions
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7
ChangeLog
View file

@ -1,3 +1,10 @@
2007-01-18 Stefan Kost <ensonic@users.sf.net>
* gst/gsttaglist.h:
* gst/gsttagsetter.c:
Add more docs regarding tag merge-modes and when to send tags. Fix 'since'
statement for new tag.
2007-01-17 Edward Hervey <edward@fluendo.com>
* plugins/elements/gstmultiqueue.c: (gst_single_queue_new):

71
gst/gsttaglist.h
View file

@ -31,7 +31,7 @@ G_BEGIN_DECLS
/**
* GstTagMergeMode:
* @GST_TAG_MERGE_UNDEFINED: undefined merge mode
* @GST_TAG_MERGE_REPLACE_ALL: replace all tags
* @GST_TAG_MERGE_REPLACE_ALL: replace all tags (clear list and append)
* @GST_TAG_MERGE_REPLACE: replace tags
* @GST_TAG_MERGE_APPEND: append tags
* @GST_TAG_MERGE_PREPEND: prepend tags
@ -39,7 +39,72 @@ G_BEGIN_DECLS
* @GST_TAG_MERGE_KEEP_ALL: keep all existing tags
* @GST_TAG_MERGE_COUNT: the number of merge modes
*
* The different tag merging modes.
* The different tag merging modes are basically replace, overwrite and append,
* but they can be seen from two directions.
* Given two taglists: A - the one that are supplied to
* gst_tag_setter_merge_tags() or gst_tag_setter_add_tags() and B - the tags
* already in the element, how are the tags merged? In the table below this is
* shown for the cases that a tag exists in the list (A) or does not exists (!A)
* and combination thereof.
*
* <table frame="all" colsep="1" rowsep="1">
* <title>merge mode</title>
* <tgroup cols='5' align='left'>
* <thead>
* <row>
* <entry>merge mode</entry>
* <entry>A + B</entry>
* <entry>A + !B</entry>
* <entry>!A + B</entry>
* <entry>!A + !B</entry>
* </row>
* </thead>
* <tbody>
* <row>
* <entry>REPLACE_ALL</entry>
* <entry>B</entry>
* <entry>-</entry>
* <entry>B</entry>
* <entry>-</entry>
* </row>
* <row>
* <entry>REPLACE</entry>
* <entry>B</entry>
* <entry>A</entry>
* <entry>B</entry>
* <entry>-</entry>
* </row>
* <row>
* <entry>APPEND</entry>
* <entry>A, B</entry>
* <entry>A</entry>
* <entry>B</entry>
* <entry>-</entry>
* </row>
* <row>
* <entry>PREPEND</entry>
* <entry>B, A</entry>
* <entry>A</entry>
* <entry>B</entry>
* <entry>-</entry>
* </row>
* <row>
* <entry>KEEP</entry>
* <entry>A</entry>
* <entry>A</entry>
* <entry>B</entry>
* <entry>-</entry>
* </row>
* <row>
* <entry>KEEP_ALL</entry>
* <entry>A</entry>
* <entry>A</entry>
* <entry>-</entry>
* <entry>-</entry>
* </row>
* </tbody>
* </tgroup>
* </table>
*/
typedef enum {
GST_TAG_MERGE_UNDEFINED,
@ -523,7 +588,7 @@ gboolean gst_tag_list_get_date_index (const GstTagList * list,
*
* number of beats per minute in audio
*
* Since: 0.10.11
* Since: 0.10.12
*/
#define GST_TAG_BEATS_PER_MINUTE "beats-per-minute"

5
gst/gsttagsetter.c
View file

@ -36,7 +36,10 @@
* <para>
* If you just want to retrieve metadata in your application then all you
* need to do is watch for tag messages on your pipeline's bus. This
* interface is only for setting metadata, not for extracting it.
* interface is only for setting metadata, not for extracting it. To set tags
* from the application, find tagsetter elements and set tags using e.g.
* gst_tag_setter_merge_tags() or gst_tag_setter_add_tags(). The application
* should do that before the element goes to %GST_STATE_PAUSED.
* </para>
* <para>
* Elements implementing the #GstTagSetter interface often have to merge