Three new chroma converters:

 * yuy2_i420: convert from Packed YUV 4:2:2 to Planar YUV 4:2:0
 * yuy2_i422: convert from Packed YUV 4:2:2 to Planar YUV 4:2:2
 * chroma_chain: attempt to chain 2 chroma converters to acheive the conversion (i.e. yuy2 -> rv32 will be done using yuy2 -> i420 -> rv32)

configure.ac

@@ -1268,7 +1268,7 @@ if test "${SYS}" != "mingwce"; then
   VLC_ADD_PLUGINS([access_fake access_filter_timeshift access_filter_record access_filter_dump])
   VLC_ADD_PLUGINS([gestures rc telnet hotkeys showintf marq podcast shout sap fake folder])
   VLC_ADD_PLUGINS([rss mosaic wall motiondetect clone crop erase bluescreen alphamask gaussianblur])
-  VLC_ADD_PLUGINS([i420_yuy2 i422_yuy2 i420_ymga i422_i420])
+  VLC_ADD_PLUGINS([i420_yuy2 i422_yuy2 i420_ymga i422_i420 yuy2_i422 yuy2_i420 chroma_chain])
   VLC_ADD_PLUGINS([aout_file linear_resampler bandlimited_resampler])
   VLC_ADD_PLUGINS([float32_mixer spdif_mixer simple_channel_mixer])
   VLC_ADD_PLUGINS([dolby_surround_decoder headphone_channel_mixer normvol equalizer param_eq])

modules/video_chroma/Modules.am

@@ -71,3 +71,14 @@ SOURCES_grey_yuv = \
 	grey_yuv.c \
 	$(NULL)
 
+SOURCES_yuy2_i422 = \
+	yuy2_i422.c \
+	$(NULL)
+
+SOURCES_yuy2_i420 = \
+	yuy2_i420.c \
+	$(NULL)
+
+SOURCES_chroma_chain = \
+	chain.c \
+	$(NULL)

modules/video_chroma/chain.c

+/*****************************************************************************
+ * chain.c : chain multiple chroma modules as a last resort solution
+ *****************************************************************************
+ * Copyright (C) 2007 the VideoLAN team
+ * $Id$
+ *
+ * Authors: Antoine Cellerier <dionoea at videolan dot org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Preamble
+ *****************************************************************************/
+
+#include <vlc/vlc.h>
+#include <vlc_vout.h>
+
+/*****************************************************************************
+ * Local and extern prototypes.
+ *****************************************************************************/
+static int  Activate ( vlc_object_t * );
+static void Destroy  ( vlc_object_t * );
+static void Chain    ( vout_thread_t *, picture_t *, picture_t * );
+
+/*****************************************************************************
+ * Module descriptor
+ *****************************************************************************/
+vlc_module_begin();
+    set_description( _("Chroma conversions using a chain of chroma conversion modules") );
+    set_capability( "chroma", 1 );
+    set_callbacks( Activate, Destroy );
+vlc_module_end();
+
+#define MAX_CHROMAS 2
+
+struct chroma_sys_t
+{
+    vlc_fourcc_t i_chroma;
+
+    vout_chroma_t chroma1;
+    vout_chroma_t chroma2;
+
+    picture_t *p_tmp;
+};
+
+static const vlc_fourcc_t pi_allowed_chromas[] = {
+    VLC_FOURCC('I','4','2','0'),
+    VLC_FOURCC('I','4','2','2'),
+    0
+};
+
+/*****************************************************************************
+ * Activate: allocate a chroma function
+ *****************************************************************************
+ * This function allocates and initializes a chroma function
+ *****************************************************************************/
+static int Activate( vlc_object_t *p_this )
+{
+    static int hack = 0;
+    vout_thread_t *p_vout = (vout_thread_t *)p_this;
+
+    if( hack )
+    {
+        msg_Err( p_this, "Preventing chain chroma reccursion" );
+        return VLC_EGENERIC;
+    }
+
+    hack = 1;
+
+    chroma_sys_t *p_sys = (chroma_sys_t *)malloc( sizeof( chroma_sys_t ) );
+    if( !p_sys )
+    {
+        hack = 0;
+        return VLC_ENOMEM;
+    }
+    memset( p_sys, 0, sizeof( chroma_sys_t ) );
+
+    int i;
+    vlc_fourcc_t i_output_chroma = p_vout->output.i_chroma;
+    vlc_fourcc_t i_render_chroma = p_vout->render.i_chroma;
+
+    for( i = 0; pi_allowed_chromas[i]; i++ )
+    {
+        msg_Warn( p_vout, "Trying %4s as a chroma chain",
+                  (const char *)&pi_allowed_chromas[i] );
+        p_vout->output.i_chroma = pi_allowed_chromas[i];
+        p_vout->chroma.p_module = module_Need( p_vout, "chroma", NULL, 0 );
+        p_vout->output.i_chroma = i_output_chroma;
+
+        if( !p_vout->chroma.p_module )
+            continue;
+
+        p_sys->chroma1 = p_vout->chroma;
+        memset( &p_vout->chroma, 0, sizeof( vout_chroma_t ) );
+
+        p_vout->render.i_chroma = pi_allowed_chromas[i];
+        p_vout->chroma.p_module = module_Need( p_vout, "chroma", NULL, 0 );
+        p_vout->render.i_chroma = i_render_chroma;
+
+        if( !p_vout->chroma.p_module )
+        {
+            p_vout->chroma = p_sys->chroma1;
+            module_Unneed( p_vout, p_vout->chroma.p_module );
+            continue;
+        }
+
+        p_sys->chroma2 = p_vout->chroma;
+        memset( &p_vout->chroma, 0, sizeof( vout_chroma_t ) );
+
+        p_sys->i_chroma = pi_allowed_chromas[i];
+        p_vout->chroma.pf_convert = Chain;
+        p_vout->chroma.p_sys = p_sys;
+        hack = 0;
+        return VLC_SUCCESS;
+    }
+
+    free( p_sys );
+    hack = 0;
+    return VLC_EGENERIC;
+}
+
+static void Destroy( vlc_object_t *p_this )
+{
+    vout_thread_t *p_vout = (vout_thread_t *)p_this;
+    vout_chroma_t chroma = p_vout->chroma;
+
+
+    p_vout->chroma = chroma.p_sys->chroma1;
+    module_Unneed( p_vout, p_vout->chroma.p_module );
+    p_vout->chroma = chroma.p_sys->chroma2;
+    module_Unneed( p_vout, p_vout->chroma.p_module );
+    p_vout->chroma = chroma;
+
+    if( chroma.p_sys->p_tmp )
+    {
+        free( chroma.p_sys->p_tmp->p_data_orig );
+        free( chroma.p_sys->p_tmp );
+    }
+    free( chroma.p_sys );
+}
+
+/*****************************************************************************
+ * Chain
+ *****************************************************************************/
+static void Chain( vout_thread_t *p_vout, picture_t *p_source,
+                   picture_t *p_dest )
+{
+    chroma_sys_t *p_sys = p_vout->chroma.p_sys;
+
+    if( !p_sys->p_tmp )
+    {
+        picture_t *p_tmp = malloc( sizeof( picture_t ) );
+        vout_AllocatePicture( VLC_OBJECT( p_vout ), p_tmp,
+                              p_sys->i_chroma,
+                              p_source->p_heap->i_width,
+                              p_source->p_heap->i_height,
+                              p_source->p_heap->i_aspect );
+        if( !p_tmp )
+            return;
+        p_sys->p_tmp = p_tmp;
+        p_tmp->pf_release = NULL;
+        p_tmp->i_status = RESERVED_PICTURE;
+        p_tmp->p_sys = NULL;
+    }
+
+    p_sys->chroma1.pf_convert( p_vout, p_source, p_sys->p_tmp );
+    p_sys->chroma2.pf_convert( p_vout, p_sys->p_tmp, p_dest );
+}