buffer: add more methods

gst/gstbuffer.c

@@ -577,6 +577,20 @@ gst_buffer_get_size (GstBuffer * buffer)
   return size;
 }
 
+/**
+ * gst_buffer_set_size:
+ * @buffer: a #GstBuffer.
+ * @size: the new size
+ *
+ * Set the total size of the buffer
+ */
+void
+gst_buffer_set_size (GstBuffer * buffer, gsize size)
+{
+  /* FIXME */
+  g_warning ("gst_buffer_set_size not imlpemented");
+}
+
 /**
  * gst_buffer_map:
  * @buffer: a #GstBuffer.
@@ -681,6 +695,47 @@ gst_buffer_unmap (GstBuffer * buffer, gpointer data, gsize size)
   return result;
 }
 
+/**
+ * gst_buffer_fill:
+ * @buffer: a #GstBuffer.
+ * @offset: the offset to fill
+ * @src: the source address
+ * @size: the size to fill
+ *
+ * Copy @size bytes fro @src to @buffer at @offset.
+ */
+void
+gst_buffer_fill (GstBuffer * buffer, gsize offset, gpointer src, gsize size)
+{
+  GPtrArray *arr = (GPtrArray *) buffer->memory;
+  gsize i, len;
+  guint8 *ptr = src;
+
+  len = arr->len;
+
+  for (i = 0; i < len && size > 0; i++) {
+    guint8 *data;
+    gsize ssize, tocopy;
+    GstMemory *mem;
+
+    mem = g_ptr_array_index (arr, i);
+
+    data = gst_memory_map (mem, &ssize, NULL, GST_MAP_WRITE);
+    if (ssize > offset) {
+      /* we have enough */
+      tocopy = MIN (ssize - offset, size);
+      memcpy (data + offset, ptr, tocopy);
+      size -= tocopy;
+      ptr += tocopy;
+      offset = 0;
+    } else {
+      /* offset past buffer, skip */
+      offset -= ssize;
+    }
+    gst_memory_unmap (mem, data, ssize);
+  }
+}
+
 /**
  * gst_buffer_extract:
  * @buffer: a #GstBuffer.

gst/gstbuffer.h

@@ -300,10 +300,14 @@ void        gst_buffer_take_memory       (GstBuffer *buffer, GstMemory *mem);
 GstMemory * gst_buffer_peek_memory       (GstBuffer *buffer, guint idx);
 void        gst_buffer_remove_memory     (GstBuffer *buffer, guint idx);
 
+void        gst_buffer_fill              (GstBuffer *buffer, gsize offset,
+                                          gpointer src, gsize size);
 void        gst_buffer_extract           (GstBuffer *buffer, gsize offset,
                                           gpointer dest, gsize size);
 
 gsize       gst_buffer_get_size          (GstBuffer *buffer);
+void        gst_buffer_set_size          (GstBuffer *buffer, gsize size);
+void        gst_buffer_trim              (GstBuffer *buffer, gsize offset, gsize size);
 
 /* getting memory */
 gpointer    gst_buffer_map               (GstBuffer *buffer, gsize *size, gsize *maxsize,

gst/gstmemory.h

@@ -60,10 +60,12 @@ struct _GstMemory {
 };
 
 typedef enum {
-  GST_MAP_READ,
+  GST_MAP_READ =  (1 << 0),
-  GST_MAP_WRITE,
+  GST_MAP_WRITE = (1 << 1),
 } GstMapFlags;
 
+#define GST_MAP_READWRITE      (GST_MAP_READ | GST_MAP_WRITE)
+
 /**
  * GST_MEMORY_TRACE_NAME:
  *