[vlc-devel] [PATCH 1/2] demux: add control calls to read the demuxer title/seekpoint

[Steve Lhomme]

this is necessary to go through (coming) demux filters
--
replaces https://patches.videolan.org/patch/13684/ with more doc

---
 include/vlc_demux.h | 23 +++++++++++++++++++++++
 src/input/demux.c   |  9 +++++++++
 2 files changed, 32 insertions(+)

diff --git a/include/vlc_demux.h b/include/vlc_demux.h
index a42998b..7b3b352 100644
--- a/include/vlc_demux.h
+++ b/include/vlc_demux.h
@@ -189,6 +189,29 @@ enum demux_query_e
      * arg1= int */
     DEMUX_SET_SEEKPOINT,        /* arg1= int            can fail */
 
+    /** Check which INPUT_UPDATE_XXX flag is set and reset the ones set.
+     *
+     * The unsigned* argument is set with the flags needed to be checked,
+     * on return it contains the values that were reset during the call 
+     *
+     * This can can fail, in which case flags from demux_t.info.i_update
+     * are read/reset
+     *
+     * arg1= unsigned * */
+    DEMUX_TEST_AND_CLEAR_FLAGS, /* arg1= unsigned*      can fail */
+    /** Read the title number currently playing
+     *
+     * Can fail, in which case demux_t.info.i_title is used
+     *
+     * arg1= int * */
+    DEMUX_GET_TITLE,            /* arg1= int*           can fail */
+    /* Read the seekpoint/chapter currently playing
+     *
+     * Can fail, in which case demux_t.info.i_seekpoint is used
+     *
+     * arg1= int * */
+    DEMUX_GET_SEEKPOINT,        /* arg1= int*           can fail */
+
     /* I. Common queries to access_demux and demux */
     /* POSITION double between 0.0 and 1.0 */
     DEMUX_GET_POSITION = 0x300, /* arg1= double *       res=    */
diff --git a/src/input/demux.c b/src/input/demux.c
index b159526..9d962f5 100644
--- a/src/input/demux.c
+++ b/src/input/demux.c
@@ -659,6 +659,9 @@ static bool SkipAPETag( demux_t *p_demux )
 
 unsigned demux_TestAndClearFlags( demux_t *p_demux, unsigned flags )
 {
+    unsigned i_update;
+    if ( demux_Control( p_demux, DEMUX_TEST_AND_CLEAR_FLAGS, &i_update ) == VLC_SUCCESS )
+        return i_update;
     unsigned ret = p_demux->info.i_update & flags;
     p_demux->info.i_update &= ~flags;
     return ret;
@@ -666,10 +669,16 @@ unsigned demux_TestAndClearFlags( demux_t *p_demux, unsigned flags )
 
 int demux_GetTitle( demux_t *p_demux )
 {
+    int i_title;
+    if ( demux_Control( p_demux, DEMUX_GET_TITLE, &i_title ) == VLC_SUCCESS )
+        return i_title;
     return p_demux->info.i_title;
 }
 
 int demux_GetSeekpoint( demux_t *p_demux )
 {
+    int i_seekpoint;
+    if ( demux_Control( p_demux, DEMUX_GET_SEEKPOINT, &i_seekpoint ) == VLC_SUCCESS  )
+        return i_seekpoint;
     return p_demux->info.i_seekpoint;
 }
-- 
2.8.2