[vlc-devel] [PATCH 15/21] input/{stream, access}: add function stream_AccessDummyNew

[Filip Roséen]

This commits adds the possibility to create a dummy stream that can be
used as the source for entities that needs one for functionality not
related to reads.

As stream-fragment data is associated with a stream, this new
functionality especially comes in handy to associate a stream_t with
an access_demux.
---
 src/input/access.c | 37 +++++++++++++++++++++++++++++++++++++
 src/input/stream.h |  6 ++++++
 2 files changed, 43 insertions(+)

diff --git a/src/input/access.c b/src/input/access.c
index 65b3ce8..9cf68fc 100644
--- a/src/input/access.c
+++ b/src/input/access.c
@@ -171,6 +171,29 @@ int access_vaDirectoryControlHelper( access_t *p_access, int i_query, va_list ar
      return VLC_SUCCESS;
 }
 
+static ssize_t AStreamNoRead(stream_t* s, void* buf, size_t len )
+{
+    VLC_UNUSED( s ); VLC_UNUSED( buf ); VLC_UNUSED( len );
+    return 0;
+}
+
+static int AStreamNoControl(stream_t* s, int i_query, va_list args )
+{
+    VLC_UNUSED( s ); VLC_UNUSED( i_query ); VLC_UNUSED( args );
+    return VLC_EGENERIC;
+}
+
+static int AStreamNoSeek(stream_t* s, uint64_t pos )
+{
+    VLC_UNUSED( s ); VLC_UNUSED( pos );
+    return VLC_EGENERIC;
+}
+
+static void AStreamNoDestroy( stream_t* s )
+{
+    VLC_UNUSED( s );
+}
+
 static int AStreamNoReadDir(stream_t *s, input_item_node_t *p_node)
 {
     (void) s; (void) p_node;
@@ -321,6 +344,20 @@ stream_t *stream_AccessNew(vlc_object_t *parent, input_thread_t *input,
     return s;
 }
 
+stream_t* stream_AccessDummyNew( vlc_object_t* parent,
+  input_thread_t* p_input, const char* mrl )
+{
+    stream_t* s = vlc_stream_CommonNewMRL( parent, mrl, AStreamNoDestroy );
+
+    s->pf_read = AStreamNoRead;
+    s->pf_seek = AStreamNoSeek;
+    s->pf_control = AStreamNoControl;
+
+    s->p_input = p_input;
+
+    return s;
+}
+
 static int compar_type(input_item_t *p1, input_item_t *p2)
 {
     if (p1->i_type != p2->i_type)
diff --git a/src/input/stream.h b/src/input/stream.h
index 88287b0..c2eb62a 100644
--- a/src/input/stream.h
+++ b/src/input/stream.h
@@ -37,6 +37,12 @@ void stream_CommonDelete( stream_t *s );
 stream_t *stream_AccessNew(vlc_object_t *, input_thread_t *, bool, const char *);
 
 /**
+ * Function used to create a stream_t that does not support
+ * any read operations, but will still be valid in terms of state.
+ */
+stream_t* stream_AccessDummyNew( vlc_object_t*, input_thread_t*, const char*);
+
+/**
  * Automatically wraps a stream with any applicable stream filter.
  * @return the (outermost/downstream) stream filter; if no filters were added,
  * then the function return the source parameter.
-- 
2.9.2