Add -Wwrite-strings to the configure flags

... and fix all warnings

configure.ac

@@ -272,10 +272,10 @@ dnl set location of plugin directory
 AG_GST_SET_PLUGINDIR
 
 dnl define an ERROR_CFLAGS Makefile variable
-AG_GST_SET_ERROR_CFLAGS($GST_GIT, [-Wmissing-declarations -Wmissing-prototypes -Wredundant-decls -Wundef])
+AG_GST_SET_ERROR_CFLAGS($GST_GIT, [-Wmissing-declarations -Wmissing-prototypes -Wredundant-decls -Wundef -Wwrite-strings])
 
 dnl define an ERROR_CXXFLAGS Makefile variable
-AG_GST_SET_ERROR_CXXFLAGS($GST_GIT, [-Wmissing-declarations -Wredundant-decls -Wundef])
+AG_GST_SET_ERROR_CXXFLAGS($GST_GIT, [-Wmissing-declarations -Wredundant-decls -Wundef -Wwrite-strings])
 
 dnl define correct level for debugging messages
 AG_GST_SET_LEVEL_DEFAULT($GST_GIT)

ext/hal/hal.c

@@ -55,7 +55,8 @@ static gchar *
 gst_hal_get_alsa_element (LibHalContext * ctx, const gchar * udi,
     GstHalDeviceType device_type)
 {
-  char *type, *element = NULL, *string = NULL;
+  char *type, *string = NULL;
+  const char *element = NULL;
   DBusError error;
 
   dbus_error_init (&error);
@@ -145,7 +146,8 @@ static gchar *
 gst_hal_get_oss_element (LibHalContext * ctx, const gchar * udi,
     GstHalDeviceType device_type)
 {
-  char *type, *element = NULL, *string = NULL;
+  char *type, *string = NULL;
+  const char *element = NULL;
   DBusError error;
 
   dbus_error_init (&error);

ext/raw1394/gstdv1394src.c

@@ -1046,7 +1046,7 @@ gst_dv1394src_uri_get_type (void)
 static gchar **
 gst_dv1394src_uri_get_protocols (void)
 {
-  static gchar *protocols[] = { "dv", NULL };
+  static gchar *protocols[] = { (char *) "dv", NULL };
 
   return protocols;
 }

ext/raw1394/gsthdv1394src.c

@@ -793,7 +793,7 @@ gst_hdv1394src_uri_get_type (void)
 static gchar **
 gst_hdv1394src_uri_get_protocols (void)
 {
-  static gchar *protocols[] = { "hdv", NULL };
+  static gchar *protocols[] = { (char *) "hdv", NULL };
 
   return protocols;
 }

ext/soup/gstsouphttpsrc.c

@@ -1395,8 +1395,8 @@ gst_soup_http_src_uri_get_type (void)
 static gchar **
 gst_soup_http_src_uri_get_protocols (void)
 {
-  static gchar *protocols[] = { "http", "https", NULL };
-  return protocols;
+  static const gchar *protocols[] = { "http", "https", NULL };
+  return (gchar **) protocols;
 }
 
 static const gchar *

ext/wavpack/gstwavpackcommon.c

@@ -40,7 +40,7 @@ gst_wavpack_read_header (WavpackHeader * header, guint8 * buf)
   g_memmove (header, buf, sizeof (WavpackHeader));
 
 #ifndef WAVPACK_OLD_API
-  WavpackLittleEndianToNative (header, WavpackHeaderFormat);
+  WavpackLittleEndianToNative (header, (char *) WavpackHeaderFormat);
 #else
   little_endian_to_native (header, WavpackHeaderFormat);
 #endif

gst/avi/gstavimux.c

@@ -1093,7 +1093,7 @@ gst_avi_mux_write_tag (const GstTagList * list, const gchar * tag,
   const struct
   {
     guint32 fcc;
-    gchar *tag;
+    const gchar *tag;
   } rifftags[] = {
     {
     GST_RIFF_INFO_IARL, GST_TAG_LOCATION}, {

gst/debugutils/gstpushfilesrc.c

@@ -152,7 +152,7 @@ gst_push_file_src_uri_get_type (void)
 static gchar **
 gst_push_file_src_uri_get_protocols (void)
 {
-  static gchar *protocols[] = { "pushfile", NULL };
+  static gchar *protocols[] = { (char *) "pushfile", NULL };
 
   return protocols;
 }

gst/flv/gstflvparse.c

@@ -507,7 +507,7 @@ gst_flv_parse_audio_negotiate (GstFLVDemux * demux, guint32 codec_tag,
     guint32 rate, guint32 channels, guint32 width)
 {
   GstCaps *caps = NULL;
-  gchar *codec_name = NULL;
+  const gchar *codec_name = NULL;
   gboolean ret = FALSE;
 
   switch (codec_tag) {
@@ -890,7 +890,7 @@ gst_flv_parse_video_negotiate (GstFLVDemux * demux, guint32 codec_tag)
 {
   gboolean ret = FALSE;
   GstCaps *caps = NULL;
-  gchar *codec_name = NULL;
+  const gchar *codec_name = NULL;
 
   /* Generate caps for that pad */
   switch (codec_tag) {

gst/goom/config_param.c

@@ -28,7 +28,7 @@ empty_fct (PluginParam * dummy)
 }
 
 PluginParam
-goom_secure_param ()
+goom_secure_param (void)
 {
   PluginParam p;
 
@@ -41,7 +41,7 @@ goom_secure_param ()
 }
 
 PluginParam
-goom_secure_f_param (char *name)
+goom_secure_f_param (const char *name)
 {
   PluginParam p = secure_param ();
 
@@ -55,7 +55,7 @@ goom_secure_f_param (char *name)
 }
 
 PluginParam
-goom_secure_f_feedback (char *name)
+goom_secure_f_feedback (const char *name)
 {
   PluginParam p = secure_f_param (name);
 
@@ -64,7 +64,7 @@ goom_secure_f_feedback (char *name)
 }
 
 PluginParam
-goom_secure_s_param (char *name)
+goom_secure_s_param (const char *name)
 {
   PluginParam p = secure_param ();
 
@@ -75,7 +75,7 @@ goom_secure_s_param (char *name)
 }
 
 PluginParam
-goom_secure_b_param (char *name, int value)
+goom_secure_b_param (const char *name, int value)
 {
   PluginParam p = secure_param ();
 
@@ -86,7 +86,7 @@ goom_secure_b_param (char *name, int value)
 }
 
 PluginParam
-goom_secure_i_param (char *name)
+goom_secure_i_param (const char *name)
 {
   PluginParam p = secure_param ();
 
@@ -100,7 +100,7 @@ goom_secure_i_param (char *name)
 }
 
 PluginParam
-goom_secure_i_feedback (char *name)
+goom_secure_i_feedback (const char *name)
 {
   PluginParam p = secure_i_param (name);
 

gst/goom/goom_config_param.h

@@ -62,8 +62,8 @@ struct BoolVal {
 
 
 typedef struct _PARAM {
-  char *name;
-  char *desc;
+  const char *name;
+  const char *desc;
   char rw;
   ParamType type;
   union {
@@ -99,20 +99,20 @@ typedef struct _PARAM {
 
 PluginParam goom_secure_param(void);
 
-PluginParam goom_secure_f_param(char *name);
-PluginParam goom_secure_i_param(char *name);
-PluginParam goom_secure_b_param(char *name, int value);
-PluginParam goom_secure_s_param(char *name);
+PluginParam goom_secure_f_param(const char *name);
+PluginParam goom_secure_i_param(const char *name);
+PluginParam goom_secure_b_param(const char *name, int value);
+PluginParam goom_secure_s_param(const char *name);
 
-PluginParam goom_secure_f_feedback(char *name);
-PluginParam goom_secure_i_feedback(char *name);
+PluginParam goom_secure_f_feedback(const char *name);
+PluginParam goom_secure_i_feedback(const char *name);
 
 void goom_set_str_param_value(PluginParam *p, const char *str);
 void goom_set_list_param_value(PluginParam *p, const char *str);
     
 typedef struct _PARAMETERS {
-  char *name;
-  char *desc;
+  const char *name;
+  const char *desc;
   int nbParams;
   PluginParam **params;
 } PluginParameters;

gst/id3demux/id3tags.c

@@ -239,8 +239,8 @@ static const gchar *obsolete_frame_ids[] = {
 
 const struct ID3v2FrameIDConvert
 {
-  gchar *orig;
-  gchar *new;
+  const gchar *orig;
+  const gchar *new;
 } frame_id_conversions[] = {
   /* 2.3.x frames */
   {

gst/law/alaw-decode.c

@@ -152,7 +152,7 @@ gst_alaw_dec_getcaps (GstPad * pad)
   GstPad *otherpad;
   GstCaps *othercaps, *result;
   const GstCaps *templ;
-  gchar *name;
+  const gchar *name;
   gint i;
 
   alawdec = GST_ALAW_DEC (GST_PAD_PARENT (pad));

gst/law/alaw-encode.c

@@ -303,7 +303,7 @@ gst_alaw_enc_getcaps (GstPad * pad)
   GstPad *otherpad;
   GstCaps *othercaps, *result;
   const GstCaps *templ;
-  gchar *name;
+  const gchar *name;
   gint i;
 
   alawenc = GST_ALAW_ENC (GST_PAD_PARENT (pad));

gst/law/mulaw-decode.c

@@ -95,7 +95,7 @@ mulawdec_getcaps (GstPad * pad)
   GstPad *otherpad;
   GstCaps *othercaps, *result;
   const GstCaps *templ;
-  gchar *name;
+  const gchar *name;
   gint i;
 
   mulawdec = GST_MULAWDEC (GST_PAD_PARENT (pad));

gst/law/mulaw-encode.c

@@ -61,7 +61,7 @@ mulawenc_getcaps (GstPad * pad)
   GstPad *otherpad;
   GstCaps *othercaps, *result;
   const GstCaps *templ;
-  gchar *name;
+  const gchar *name;
   gint i;
 
   mulawenc = GST_MULAWENC (GST_PAD_PARENT (pad));

gst/matroska/ebml-write.c

@@ -749,7 +749,8 @@ gst_ebml_replace_uint (GstEbmlWrite * ebml, guint64 pos, guint64 num)
  * Write EBML header.
  */
 void
-gst_ebml_write_header (GstEbmlWrite * ebml, gchar * doctype, guint version)
+gst_ebml_write_header (GstEbmlWrite * ebml, const gchar * doctype,
+    guint version)
 {
   guint64 pos;
 

gst/matroska/ebml-write.h

@@ -112,7 +112,7 @@ void    gst_ebml_write_binary        (GstEbmlWrite *ebml,
                                       guchar       *binary,
                                       guint64       length);
 void    gst_ebml_write_header        (GstEbmlWrite *ebml,
-                                      gchar        *doctype,
+                                      const gchar  *doctype,
                                       guint         version);
 
 /*

gst/matroska/matroska-demux.c

@@ -2934,8 +2934,8 @@ gst_matroska_demux_parse_metadata_id_simple_tag (GstMatroskaDemux * demux,
   /* FIXME: check if there are more useful mappings */
   struct
   {
-    gchar *matroska_tagname;
-    gchar *gstreamer_tagname;
+    const gchar *matroska_tagname;
+    const gchar *gstreamer_tagname;
   }
   tag_conv[] = {
     {
@@ -4025,7 +4025,7 @@ gst_matroska_demux_check_subtitle_buffer (GstElement * element,
     }
   }
 
-  utf8 = g_convert_with_fallback (data, size, "UTF-8", encoding, "*",
+  utf8 = g_convert_with_fallback (data, size, "UTF-8", encoding, (char *) "*",
       NULL, NULL, &err);
 
   if (err) {
@@ -4036,7 +4036,7 @@ gst_matroska_demux_check_subtitle_buffer (GstElement * element,
 
     /* invalid input encoding, fall back to ISO-8859-15 (always succeeds) */
     encoding = "ISO-8859-15";
-    utf8 = g_convert_with_fallback (data, size, "UTF-8", encoding, "*",
+    utf8 = g_convert_with_fallback (data, size, "UTF-8", encoding, (char *) "*",
         NULL, NULL, NULL);
   }
 
@@ -5387,7 +5387,7 @@ gst_matroska_demux_chain (GstPad * pad, GstBuffer * buffer)
   guint needed = 0;
   guint32 id;
   guint64 length;
-  gchar *name;
+  const gchar *name;
 
   gst_adapter_push (demux->adapter, buffer);
   buffer = NULL;

gst/matroska/matroska-mux.c

@@ -1278,10 +1278,10 @@ speex_streamheader_to_codecdata (const GValue * streamheader,
   return TRUE;
 }
 
-static gchar *
+static const gchar *
 aac_codec_data_to_codec_id (const GstBuffer * buf)
 {
-  gchar *result;
+  const gchar *result;
   gint profile;
 
   /* default to MAIN */
@@ -2080,8 +2080,8 @@ gst_matroska_mux_write_simple_tag (const GstTagList * list, const gchar * tag,
   /* TODO: more sensible tag mappings */
   struct
   {
-    gchar *matroska_tagname;
-    gchar *gstreamer_tagname;
+    const gchar *matroska_tagname;
+    const gchar *gstreamer_tagname;
   }
   tag_conv[] = {
     {

gst/qtdemux/qtdemux.c

@@ -6582,7 +6582,8 @@ qtdemux_tag_add_blob (GNode * node, GstQTDemux * demux)
   gint len;
   guint8 *data;
   GstBuffer *buf;
-  gchar *media_type, *style;
+  gchar *media_type;
+  const gchar *style;
   GstCaps *caps;
   guint i;
   guint8 ndata[4];
@@ -6998,7 +6999,7 @@ gst_qtdemux_handle_esds (GstQTDemux * qtdemux, QtDemuxStream * stream,
   guint8 *data_ptr = NULL;
   int data_len = 0;
   guint8 object_type_id = 0;
-  char *codec_name = NULL;
+  const char *codec_name = NULL;
   GstCaps *caps = NULL;
 
   GST_MEMDUMP_OBJECT (qtdemux, "esds", ptr, len);

gst/rtp/gstrtpdvpay.c

@@ -185,7 +185,7 @@ gst_rtp_dv_pay_setcaps (GstBaseRTPPayload * payload, GstCaps * caps)
 static gboolean
 gst_dv_pay_negotiate (GstRTPDVPay * rtpdvpay, guint8 * data, guint size)
 {
-  gchar *encode, *media;
+  const gchar *encode, *media;
   gboolean audio_bundled, res;
 
   if ((data[3] & 0x80) == 0) {  /* DSF flag */

gst/rtp/gstrtpmp4gpay.c

@@ -331,7 +331,7 @@ gst_rtp_mp4g_pay_setcaps (GstBaseRTPPayload * payload, GstCaps * caps)
   GstRtpMP4GPay *rtpmp4gpay;
   GstStructure *structure;
   const GValue *codec_data;
-  gchar *media_type = NULL;
+  const gchar *media_type = NULL;
   gboolean res;
 
   rtpmp4gpay = GST_RTP_MP4G_PAY (payload);

gst/rtsp/gstrtspsrc.c

@@ -1245,7 +1245,7 @@ gst_rtspsrc_media_to_caps (gint pt, const GstSDPMedia * media)
       pairs = g_strsplit (p, ";", 0);
       for (i = 0; pairs[i]; i++) {
         gchar *valpos;
-        gchar *val, *key;
+        const gchar *val, *key;
 
         /* the key may not have a '=', the value can have other '='s */
         valpos = strstr (pairs[i], "=");
@@ -5564,9 +5564,9 @@ gst_rtspsrc_uri_get_type (void)
 static gchar **
 gst_rtspsrc_uri_get_protocols (void)
 {
-  static gchar *protocols[] = { "rtsp", "rtspu", "rtspt", "rtsph", NULL };
+  static const gchar *protocols[] = { "rtsp", "rtspu", "rtspt", "rtsph", NULL };
 
-  return protocols;
+  return (gchar **) protocols;
 }
 
 static const gchar *

gst/udp/gstudpsink.c

@@ -258,7 +258,7 @@ gst_udpsink_uri_get_type (void)
 static gchar **
 gst_udpsink_uri_get_protocols (void)
 {
-  static gchar *protocols[] = { "udp", NULL };
+  static gchar *protocols[] = { (char *) "udp", NULL };
 
   return protocols;
 }

gst/udp/gstudpsrc.c

@@ -995,7 +995,7 @@ gst_udpsrc_uri_get_type (void)
 static gchar **
 gst_udpsrc_uri_get_protocols (void)
 {
-  static gchar *protocols[] = { "udp", NULL };
+  static gchar *protocols[] = { (char *) "udp", NULL };
 
   return protocols;
 }

gst/videofilter/gstvideobalance.c

@@ -394,7 +394,7 @@ static void
 gst_video_balance_init (GTypeInstance * instance, gpointer g_class)
 {
   GstVideoBalance *videobalance = GST_VIDEO_BALANCE (instance);
-  char *channels[4] = { "HUE", "SATURATION",
+  const char *channels[4] = { "HUE", "SATURATION",
     "BRIGHTNESS", "CONTRAST"
   };
   gint i;

sys/oss/gstossmixertrack.c

@@ -83,7 +83,7 @@ static void
 fill_labels (void)
 {
   gint i, pos;
-  gchar *origs[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_LABELS;
+  const gchar *origs[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_LABELS;
   const struct
   {
     const gchar *given;

sys/v4l2/gstv4l2object.c

@@ -331,7 +331,7 @@ gst_v4l2_object_install_properties_helper (GObjectClass * gobject_class,
 GstV4l2Object *
 gst_v4l2_object_new (GstElement * element,
     enum v4l2_buf_type type,
-    char *default_device,
+    const char *default_device,
     GstV4l2GetInOutFunction get_in_out_func,
     GstV4l2SetInOutFunction set_in_out_func,
     GstV4l2UpdateFpsFunction update_fps_func)

sys/v4l2/gstv4l2object.h

@@ -136,8 +136,8 @@ GType gst_v4l2_object_get_type (void);
 
 /* create/destroy */
 GstV4l2Object *	gst_v4l2_object_new 		 (GstElement * element,
-                            enum v4l2_buf_type  type,
-                            char *default_device,
+                                                  enum v4l2_buf_type  type,
+                                                  const char *default_device,
                    				  GstV4l2GetInOutFunction get_in_out_func,
                    				  GstV4l2SetInOutFunction set_in_out_func,
 		   				  GstV4l2UpdateFpsFunction   update_fps_func);

sys/v4l2/gstv4l2src.c

@@ -969,7 +969,7 @@ gst_v4l2src_uri_get_type (void)
 static gchar **
 gst_v4l2src_uri_get_protocols (void)
 {
-  static gchar *protocols[] = { "v4l2", NULL };
+  static gchar *protocols[] = { (char *) "v4l2", NULL };
 
   return protocols;
 }

tests/check/elements/avimux.c

@@ -55,7 +55,7 @@ static GstStaticPadTemplate srcaudiotemplate = GST_STATIC_PAD_TEMPLATE ("src",
 /* setup and teardown needs some special handling for muxer */
 static GstPad *
 setup_src_pad (GstElement * element,
-    GstStaticPadTemplate * template, GstCaps * caps, gchar * sinkname)
+    GstStaticPadTemplate * template, GstCaps * caps, const gchar * sinkname)
 {
   GstPad *srcpad, *sinkpad;
 
@@ -84,7 +84,7 @@ setup_src_pad (GstElement * element,
 }
 
 static void
-teardown_src_pad (GstElement * element, gchar * sinkname)
+teardown_src_pad (GstElement * element, const gchar * sinkname)
 {
   GstPad *srcpad, *sinkpad;
   gchar *padname;
@@ -116,7 +116,7 @@ teardown_src_pad (GstElement * element, gchar * sinkname)
 }
 
 static GstElement *
-setup_avimux (GstStaticPadTemplate * srctemplate, gchar * sinkname)
+setup_avimux (GstStaticPadTemplate * srctemplate, const gchar * sinkname)
 {
   GstElement *avimux;
 
@@ -131,7 +131,7 @@ setup_avimux (GstStaticPadTemplate * srctemplate, gchar * sinkname)
 }
 
 static void
-cleanup_avimux (GstElement * avimux, gchar * sinkname)
+cleanup_avimux (GstElement * avimux, const gchar * sinkname)
 {
   GST_DEBUG ("cleanup_avimux");
   gst_element_set_state (avimux, GST_STATE_NULL);
@@ -144,8 +144,9 @@ cleanup_avimux (GstElement * avimux, gchar * sinkname)
 }
 
 static void
-check_avimux_pad (GstStaticPadTemplate * srctemplate, gchar * src_caps_string,
-    gchar * chunk_id, gchar * sinkname)
+check_avimux_pad (GstStaticPadTemplate * srctemplate,
+    const gchar * src_caps_string, const gchar * chunk_id,
+    const gchar * sinkname)
 {
   GstElement *avimux;
   GstBuffer *inbuffer, *outbuffer;

tests/check/elements/level.c

@@ -153,7 +153,7 @@ GST_START_TEST (test_int16)
 
   /* block wave of half amplitude has -5.94 dB for rms, peak and decay */
   for (i = 0; i < 2; ++i) {
-    gchar *fields[3] = { "rms", "peak", "decay" };
+    const gchar *fields[3] = { "rms", "peak", "decay" };
     for (j = 0; j < 3; ++j) {
       list = gst_structure_get_value (structure, fields[j]);
       value = gst_value_list_get_value (list, i);
@@ -201,7 +201,7 @@ GST_START_TEST (test_int16_panned)
   const GValue *list, *value;
   GstClockTime endtime;
   gdouble dB;
-  gchar *fields[3] = { "rms", "peak", "decay" };
+  const gchar *fields[3] = { "rms", "peak", "decay" };
 
   level = setup_level ();
   g_object_set (level, "message", TRUE, "interval", GST_SECOND / 10, NULL);

tests/check/elements/rtpbin_buffer_list.c

@@ -61,7 +61,7 @@ static GstBuffer *header_buffer[2] = { NULL, NULL };
 
 /* Some payload.
  */
-static char *payload =
+static const char *payload =
     "0123456789ABSDEF0123456789ABSDEF0123456789ABSDEF0123456789ABSDEF0123456789ABSDEF"
     "0123456789ABSDEF0123456789ABSDEF0123456789ABSDEF0123456789ABSDEF0123456789ABSDEF"
     "0123456789ABSDEF0123456789ABSDEF0123456789ABSDEF0123456789ABSDEF0123456789ABSDEF"

tests/check/pipelines/simple-launch-lines.c

@@ -105,7 +105,7 @@ done:
 
 GST_START_TEST (test_rtp_payloaders)
 {
-  gchar *s;
+  const gchar *s;
 
   /* FIXME: going to playing would be nice, but thet leads to lot of failure */
   GstState target_state = GST_STATE_PAUSED;
@@ -223,7 +223,7 @@ GST_START_TEST (test_rtp_payloaders)
 GST_END_TEST
 GST_START_TEST (test_video_encoders_decoders)
 {
-  gchar *s;
+  const gchar *s;
   GstState target_state = GST_STATE_PLAYING;
 
   /* no is-live on the source because we actually want to preroll since