noise video filter

configure.ac

@@ -561,7 +561,7 @@ AM_CONDITIONAL(BUILD_GETOPT, ${need_getopt})
 if test "${SYS}" != "mingw32" -a "${SYS}" != "mingwce"; then
 AC_TYPE_SIGNAL
 AC_CHECK_LIB(m,cos,[
-  VLC_ADD_LDFLAGS([adjust wave ripple psychedelic gradient a52tofloat32 dtstofloat32 x264 goom visual panoramix rotate],[-lm])
+  VLC_ADD_LDFLAGS([adjust wave ripple psychedelic gradient a52tofloat32 dtstofloat32 x264 goom visual panoramix rotate noise],[-lm])
 ])
 AC_CHECK_LIB(m,pow,[
   VLC_ADD_LDFLAGS([ffmpeg ffmpegaltivec stream_out_transrate i420_rgb faad twolame equalizer param_eq vlc freetype mpc dmo quicktime realaudio galaktos],[-lm])
@@ -1150,7 +1150,7 @@ dnl
 VLC_ADD_PLUGINS([dummy logger memcpy])
 VLC_ADD_PLUGINS([mpgv mpga m4v m4a h264 ps pva avi asf mp4 rawdv nsv real aiff mjpeg demuxdump flac])
 VLC_ADD_PLUGINS([cvdsub svcdsub spudec subsdec dvbsub mpeg_audio lpcm a52 dts cinepak flacdec])
-VLC_ADD_PLUGINS([deinterlace invert adjust transform wave ripple psychedelic gradient motionblur rv32 rotate])
+VLC_ADD_PLUGINS([deinterlace invert adjust transform wave ripple psychedelic gradient motionblur rv32 rotate noise])
 VLC_ADD_PLUGINS([fixed32tos16 s16tofixed32 u8tofixed32 mono])
 VLC_ADD_PLUGINS([trivial_resampler ugly_resampler])
 VLC_ADD_PLUGINS([trivial_channel_mixer trivial_mixer])

modules/video_filter/Modules.am

@@ -24,4 +24,5 @@ SOURCES_panoramix = panoramix.c
 SOURCES_opencv_wrapper = opencv_wrapper.c
 SOURCES_opencv_example = opencv_example.cpp filter_event_info.h
 SOURCES_rotate = rotate.c
+SOURCES_noise = noise.c
 noinst_HEADERS = filter_common.h

modules/video_filter/noise.c

@@ -0,0 +1,192 @@
+/*****************************************************************************
+ * noise.c : "add noise to image" video filter
+ *****************************************************************************
+ * Copyright (C) 2000-2006 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 <stdlib.h>                                      /* malloc(), free() */
+#include <string.h>
+
+#include <math.h>                                            /* sin(), cos() */
+
+#include <vlc/vlc.h>
+#include <vlc/decoder.h>
+
+#include "vlc_filter.h"
+
+/*****************************************************************************
+ * Local prototypes
+ *****************************************************************************/
+static int  Create    ( vlc_object_t * );
+static void Destroy   ( vlc_object_t * );
+
+static picture_t *Filter( filter_t *, picture_t * );
+
+#define FILTER_PREFIX "noise-"
+
+/*****************************************************************************
+ * Module descriptor
+ *****************************************************************************/
+vlc_module_begin();
+    set_description( _("Noise video filter") );
+    set_shortname( _( "Noise" ));
+    set_capability( "video filter2", 0 );
+    set_category( CAT_VIDEO );
+    set_subcategory( SUBCAT_VIDEO_VFILTER );
+
+    add_shortcut( "noise" );
+    set_callbacks( Create, Destroy );
+vlc_module_end();
+
+static const char *ppsz_filter_options[] = {
+    NULL
+};
+
+/*****************************************************************************
+ * vout_sys_t: Distort video output method descriptor
+ *****************************************************************************
+ * This structure is part of the video output thread descriptor.
+ * It describes the Distort specific properties of an output thread.
+ *****************************************************************************/
+struct filter_sys_t
+{
+    mtime_t last_date;
+};
+
+/*****************************************************************************
+ * Create: allocates Distort video thread output method
+ *****************************************************************************
+ * This function allocates and initializes a Distort vout method.
+ *****************************************************************************/
+static int Create( vlc_object_t *p_this )
+{
+    filter_t *p_filter = (filter_t *)p_this;
+
+    /* Allocate structure */
+    p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
+    if( p_filter->p_sys == NULL )
+    {
+        msg_Err( p_filter, "out of memory" );
+        return VLC_ENOMEM;
+    }
+
+    config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
+                       p_filter->p_cfg );
+
+    p_filter->pf_video_filter = Filter;
+
+    p_filter->p_sys->last_date = 0;
+
+    return VLC_SUCCESS;
+}
+
+/*****************************************************************************
+ * Destroy: destroy Distort video thread output method
+ *****************************************************************************
+ * Terminate an output method created by DistortCreateOutputMethod
+ *****************************************************************************/
+static void Destroy( vlc_object_t *p_this )
+{
+    filter_t *p_filter = (filter_t *)p_this;
+    free( p_filter->p_sys );
+}
+
+/*****************************************************************************
+ * Render: displays previously rendered output
+ *****************************************************************************
+ * This function send the currently rendered image to Distort image, waits
+ * until it is displayed and switch the two rendering buffers, preparing next
+ * frame.
+ *****************************************************************************/
+static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
+{
+    picture_t *p_outpic;
+    filter_sys_t *p_sys = p_filter->p_sys;
+    int i_index;
+    mtime_t new_date = mdate();
+
+    if( !p_pic ) return NULL;
+
+    p_outpic = p_filter->pf_vout_buffer_new( p_filter );
+    if( !p_outpic )
+    {
+        msg_Warn( p_filter, "can't get output picture" );
+        if( p_pic->pf_release )
+            p_pic->pf_release( p_pic );
+        return NULL;
+    }
+
+    p_sys->last_date = new_date;
+
+    for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
+    {
+        int i_line, i_num_lines, i_col, i_num_cols;
+        uint8_t black_pixel;
+        uint8_t *p_in, *p_out;
+
+        p_in = p_pic->p[i_index].p_pixels;
+        p_out = p_outpic->p[i_index].p_pixels;
+
+        i_num_lines = p_pic->p[i_index].i_visible_lines;
+        i_num_cols = p_pic->p[i_index].i_visible_pitch;
+
+        for( i_line = 0 ; i_line < i_num_lines ; i_line++ )
+        {
+            if( rand()%8 )
+            {
+                /* line isn't noisy */
+                p_filter->p_libvlc->pf_memcpy( p_out+i_line*i_num_cols,
+                                               p_in+i_line*i_num_cols,
+                                               i_num_cols );
+            }
+            else
+            {
+                /* this line is noisy */
+                int noise_level = rand()%8+2;
+                for( i_col = 0; i_col < i_num_cols ; i_col++ )
+                {
+                    if( rand()%noise_level )
+                    {
+                        p_out[i_line*i_num_cols+i_col] =
+                            p_in[i_line*i_num_cols+i_col];
+                    }
+                    else
+                    {
+                        p_out[i_line*i_num_cols+i_col] = (rand()%3)*0x7f;
+                    }
+                }
+            }
+        }
+    }
+
+    p_outpic->date = p_pic->date;
+    p_outpic->b_force = p_pic->b_force;
+    p_outpic->i_nb_fields = p_pic->i_nb_fields;
+    p_outpic->b_progressive = p_pic->b_progressive;
+    p_outpic->b_top_field_first = p_pic->b_top_field_first;
+
+    if( p_pic->pf_release )
+        p_pic->pf_release( p_pic );
+
+    return p_outpic;
+}