Make it possible to change the fake-image at runtime.

Add option to specify the chroma used by fake.

modules/codec/fake.c

@@ -38,6 +38,8 @@ static int  OpenDecoder   ( vlc_object_t * );
 static void CloseDecoder  ( vlc_object_t * );
 
 static picture_t *DecodeBlock  ( decoder_t *, block_t ** );
+static int FakeCallback( vlc_object_t *, char const *,
+                         vlc_value_t, vlc_value_t, void * );
 
 /*****************************************************************************
  * Module descriptor
@@ -63,6 +65,9 @@ static picture_t *DecodeBlock  ( decoder_t *, block_t ** );
 #define DEINTERLACE_MODULE_TEXT N_("Deinterlace module")
 #define DEINTERLACE_MODULE_LONGTEXT N_( \
     "Deinterlace module to use." )
+#define CHROMA_TEXT N_("Chroma used.")
+#define CHROMA_LONGTEXT N_( \
+    "Force use of a specific chroma for output. Default is I420." )
 
 static const char *ppsz_deinterlace_type[] =
 {
@@ -94,8 +99,16 @@ vlc_module_begin();
                 DEINTERLACE_MODULE_TEXT, DEINTERLACE_MODULE_LONGTEXT,
                 VLC_FALSE );
         change_string_list( ppsz_deinterlace_type, 0, 0 );
+    add_string( "fake-chroma", "I420", NULL, CHROMA_TEXT, CHROMA_LONGTEXT,
+                VLC_TRUE );
 vlc_module_end();
 
+struct decoder_sys_t
+{
+    picture_t *p_image;
+    vlc_mutex_t lock;
+};
+
 /*****************************************************************************
  * OpenDecoder: probe the decoder and return score
  *****************************************************************************/
@@ -106,7 +119,7 @@ static int OpenDecoder( vlc_object_t *p_this )
     image_handler_t *p_handler;
     video_format_t fmt_in, fmt_out;
     picture_t *p_image;
-    char *psz_file;
+    char *psz_file, *psz_chroma;
     vlc_bool_t b_keep_ar;
     int i_aspect = 0;
 
@@ -115,19 +128,37 @@ static int OpenDecoder( vlc_object_t *p_this )
         return VLC_EGENERIC;
     }
 
-    var_Create( p_dec, "fake-file", VLC_VAR_STRING | VLC_VAR_DOINHERIT );
-    var_Get( p_dec, "fake-file", &val );
-    if( val.psz_string == NULL || !*val.psz_string )
+    p_dec->p_sys = (decoder_sys_t *)malloc( sizeof( decoder_sys_t ) );
+    if( !p_dec->p_sys )
+    {
+        return VLC_ENOMEM;
+    }
+
+    psz_file = var_CreateGetNonEmptyStringCommand( p_dec, "fake-file" );
+    if( !psz_file )
     {
-        if( val.psz_string ) free( val.psz_string );
         msg_Err( p_dec, "specify a file with --fake-file=..." );
         return VLC_EGENERIC;
     }
-    psz_file = val.psz_string;
+    var_AddCallback( p_dec, "fake-file", FakeCallback, p_dec );
 
     memset( &fmt_in, 0, sizeof(fmt_in) );
     memset( &fmt_out, 0, sizeof(fmt_out) );
-    fmt_out.i_chroma = VLC_FOURCC('I','4','2','0');
+
+    psz_chroma = var_CreateGetString( p_dec, "fake-chroma" );
+    if( strlen( psz_chroma ) != 4 )
+    {
+        msg_Warn( p_dec, "Invalid chroma (%s). Using I420.", psz_chroma );
+        fmt_out.i_chroma = VLC_FOURCC('I','4','2','0');
+    }
+    else
+    {
+        fmt_out.i_chroma = VLC_FOURCC( psz_chroma[0],
+                                       psz_chroma[1],
+                                       psz_chroma[2],
+                                       psz_chroma[3] );
+    }
+    free( psz_chroma );
 
     var_Create( p_dec, "fake-keep-ar", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
     var_Get( p_dec, "fake-keep-ar", &val );
@@ -265,12 +296,14 @@ static int OpenDecoder( vlc_object_t *p_this )
 
     /* Set output properties */
     p_dec->fmt_out.i_cat = VIDEO_ES;
-    p_dec->fmt_out.i_codec = VLC_FOURCC('I','4','2','0');
+    p_dec->fmt_out.i_codec = fmt_out.i_chroma;
     p_dec->fmt_out.video = fmt_out;
 
     /* Set callbacks */
     p_dec->pf_decode_video = DecodeBlock;
-    p_dec->p_sys = (decoder_sys_t *)p_image;
+
+    p_dec->p_sys->p_image = p_image;
+    vlc_mutex_init( p_dec, &p_dec->p_sys->lock );
 
     return VLC_SUCCESS;
 }
@@ -280,7 +313,6 @@ static int OpenDecoder( vlc_object_t *p_this )
  ****************************************************************************/
 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 {
-    picture_t *p_image = (picture_t *)p_dec->p_sys;
     picture_t *p_pic;
 
     if( pp_block == NULL || !*pp_block ) return NULL;
@@ -291,7 +323,10 @@ static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
         goto error;
     }
 
-    vout_CopyPicture( p_dec, p_pic, p_image );
+    vlc_mutex_lock( &p_dec->p_sys->lock );
+    vout_CopyPicture( p_dec, p_pic, p_dec->p_sys->p_image );
+    vlc_mutex_unlock( &p_dec->p_sys->lock );
+
     p_pic->date = (*pp_block)->i_pts;
 
 error:
@@ -307,8 +342,60 @@ error:
 static void CloseDecoder( vlc_object_t *p_this )
 {
     decoder_t *p_dec = (decoder_t *)p_this;
-    picture_t *p_image = (picture_t *)p_dec->p_sys;
+    picture_t *p_image = p_dec->p_sys->p_image;
 
     if( p_image != NULL )
         p_image->pf_release( p_image );
+
+    vlc_mutex_destroy( &p_dec->p_sys->lock );
+    free( p_dec->p_sys );
+}
+
+/*****************************************************************************
+ * FakeCallback: Image source change callback.
+ *****************************************************************************/
+static int FakeCallback( vlc_object_t *p_this, char const *psz_var,
+                         vlc_value_t oldval, vlc_value_t newval,
+                         void *p_data )
+{
+    decoder_t *p_dec = (decoder_t *)p_data;
+
+    if( !strcmp( psz_var, "fake-file" ) )
+    {
+        image_handler_t *p_handler;
+        picture_t *p_new_image;
+        video_format_t fmt_in, fmt_out;
+        char *psz_file = newval.psz_string;
+        picture_t *p_image;
+
+        vlc_mutex_lock( &p_dec->p_sys->lock );
+        p_image = p_dec->p_sys->p_image;
+
+        if( !psz_file || !*psz_file )
+        {
+            msg_Err( p_dec, "fake-file value must be non empty." );
+            vlc_mutex_unlock( &p_dec->p_sys->lock );
+            return VLC_EGENERIC;
+        }
+        msg_Dbg( p_dec, "Changing fake-file to %s.", psz_file );
+
+        memset( &fmt_in, 0, sizeof(fmt_in) );
+        fmt_out = p_dec->fmt_out.video;
+        p_handler = image_HandlerCreate( p_dec );
+        p_new_image = image_ReadUrl( p_handler, psz_file, &fmt_in, &fmt_out );
+        image_HandlerDelete( p_handler );
+
+        if( !p_new_image )
+        {
+            msg_Err( p_dec, "error while reading image (%s)", psz_file );
+            vlc_mutex_unlock( &p_dec->p_sys->lock );
+            return VLC_EGENERIC;
+        }
+
+        p_dec->p_sys->p_image = p_new_image;
+        p_image->pf_release( p_image );
+        vlc_mutex_unlock( &p_dec->p_sys->lock );
+    }
+
+    return VLC_SUCCESS;
 }