[pitivi: 2/5] fix bug 605445 - Pitivi does not work on big endian machines

[Edward Hervey <edwardrv src gnome org>]

commit 822818aad531ea85081a48e1a4e4a1523120ebac
Author: Benjamin Berg <benjamin sipsolutions net>
Date:   Mon Nov 29 11:24:40 2010 +0000

    fix bug 605445 - Pitivi does not work on big endian machines

 pitivi/elements/arraysink.py     |    4 +++-
 pitivi/elements/mixer.py         |    3 ++-
 pitivi/elements/thumbnailsink.py |   17 +++++++++++------
 pitivi/utils.py                  |    9 +++++++++
 4 files changed, 25 insertions(+), 8 deletions(-)
---
diff --git a/pitivi/elements/arraysink.py b/pitivi/elements/arraysink.py
index 303146b..5a1b8f3 100644
--- a/pitivi/elements/arraysink.py
+++ b/pitivi/elements/arraysink.py
@@ -27,6 +27,7 @@ gobject.threads_init()
 import gst
 import gtk
 import array
+from pitivi.utils import native_endianness
 
 class ArraySink(gst.BaseSink):
 
@@ -35,9 +36,10 @@ class ArraySink(gst.BaseSink):
     """
     caps = gst.Caps(
         "audio/x-raw-float, width=(int) 32, "
-        "endianness = (int) LITTLE_ENDIAN, "
+        "endianness = (int) %s, "
         "channels = (int) 1,"
         "rate = (int) [1, 96000]"
+        % native_endianness
     )
 
     __gsttemplates__ = (
diff --git a/pitivi/elements/mixer.py b/pitivi/elements/mixer.py
index f03cdc3..bf7a4d4 100644
--- a/pitivi/elements/mixer.py
+++ b/pitivi/elements/mixer.py
@@ -25,6 +25,7 @@ Audio and Video mixers
 
 import gobject
 import gst
+from pitivi.utils import native_endianness
 
 from pitivi.signalinterface import Signallable
 
@@ -51,7 +52,7 @@ class SmartAdderBin(gst.Bin):
         self.adder = gst.element_factory_make("adder", "real-adder")
         # FIXME : USE THE PROJECT SETTINGS FOR THESE CAPS !
         csp = gst.element_factory_make("capsfilter")
-        csp.props.caps = gst.Caps("audio/x-raw-int,depth=32,width=32,signed=True,rate=44100,channels=2,endianness=1234")
+        csp.props.caps = gst.Caps("audio/x-raw-int,depth=32,width=32,signed=True,rate=44100,channels=2,endianness=%s" % native_endianness)
         self.add(self.adder, csp)
         self.adder.link_pads_full("src", csp, "sink", gst.PAD_LINK_CHECK_NOTHING)
         srcpad = gst.GhostPad("src", csp.get_pad("src"))
diff --git a/pitivi/elements/thumbnailsink.py b/pitivi/elements/thumbnailsink.py
index 2bc4ed9..0f51041 100644
--- a/pitivi/elements/thumbnailsink.py
+++ b/pitivi/elements/thumbnailsink.py
@@ -26,6 +26,7 @@ import gobject
 import gst
 import cairo
 import array
+from pitivi.utils import big_to_cairo_alpha_mask, big_to_cairo_red_mask, big_to_cairo_green_mask, big_to_cairo_blue_mask
 
 class CairoSurfaceThumbnailSink(gst.BaseSink):
     """
@@ -47,13 +48,17 @@ class CairoSurfaceThumbnailSink(gst.BaseSink):
                          gst.Caps("video/x-raw-rgb,"
                                   "bpp = (int) 32, depth = (int) 32,"
                                   "endianness = (int) BIG_ENDIAN,"
-                                  "blue_mask = (int)  0xFF000000, "
-                                  "green_mask = (int) 0x00FF0000, "
-                                  "red_mask = (int)   0x0000FF00, "
-                                  "alpha_mask = (int) 0x000000FF, "
+                                  "alpha_mask = (int) %i, "
+                                  "red_mask = (int)   %i, "
+                                  "green_mask = (int) %i, "
+                                  "blue_mask = (int)  %i, "
                                   "width = (int) [ 1, max ], "
                                   "height = (int) [ 1, max ], "
-                                  "framerate = (fraction) [ 0, max ]"))
+                                  "framerate = (fraction) [ 0, max ]"
+                                  % (big_to_cairo_alpha_mask,
+                                     big_to_cairo_red_mask,
+                                     big_to_cairo_green_mask,
+                                     big_to_cairo_blue_mask)))
         )
 
     def __init__(self):
@@ -74,7 +79,7 @@ class CairoSurfaceThumbnailSink(gst.BaseSink):
     def do_render(self, buf):
         self.log("buffer %s %d" % (gst.TIME_ARGS(buf.timestamp),
                                    len(buf.data)))
-        b = array.array("B")
+        b = array.array("b")
         b.fromstring(buf)
         pixb = cairo.ImageSurface.create_for_data(b,
             cairo.FORMAT_ARGB32,
diff --git a/pitivi/utils.py b/pitivi/utils.py
index 6dc0bb8..f0309ad 100644
--- a/pitivi/utils.py
+++ b/pitivi/utils.py
@@ -27,6 +27,7 @@ import sys
 import gobject
 import gst, bisect
 import os
+import struct
 from pitivi.signalinterface import Signallable
 import pitivi.log.log as log
 from gettext import ngettext
@@ -498,3 +499,11 @@ def profile(func, profiler_filename="result.prof"):
 
 def formatPercent(value):
     return "%3d%%" % (value * 100)
+
+
+native_endianness = struct.pack('=I', 0x34333231)
+
+big_to_cairo_alpha_mask = struct.unpack('=i', '\xFF\x00\x00\x00')[0]
+big_to_cairo_red_mask = struct.unpack('=i', '\x00\xFF\x00\x00')[0]
+big_to_cairo_green_mask = struct.unpack('=i', '\x00\x00\xFF\x00')[0]
+big_to_cairo_blue_mask = struct.unpack('=i', '\x00\x00\x00\xFF')[0]