From: Andre Noll <maan@tuebingen.mpg.de>
Date: Sun, 26 Apr 2015 12:11:56 +0000 (+0200)
Subject: Merge branch 'refs/heads/t/immediate-si-update'
X-Git-Tag: v0.5.5~40
X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=commitdiff_plain;h=1a8e3628040a94a8c06027335962a6cb2f827a63;hp=f3623744f5b28e0df91323cf5069f1932df7848d

Merge branch 'refs/heads/t/immediate-si-update'

Cooking in next for four weeks.

	* aft: Store resolved paths when adding files.
	* aft: Update mtime and file size on afhi changes.
	* aft: Update status items on afs events.
	* aft.c: Pass struct ls_data pointer to make_status_items().
	* afs: Simplify open_next_audio_file().

Conflicts:
	aft.c
---

diff --git a/.gitignore b/.gitignore
index 6df2e505..2889d20d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -17,6 +17,8 @@ TODO
 paraslash-*.tar.bz2
 web/dia/overview.pdf
 *.swp
+*.rej
+*~
 error2.h
 web_sync
 confdefs.h
diff --git a/INSTALL b/INSTALL
index 4a814dc1..4cc4b1fe 100644
--- a/INSTALL
+++ b/INSTALL
@@ -1,15 +1,21 @@
 Any knowledge of how to work with mouse and icons is not required.
 
-From tarball:
-
+Installing osl
+~~~~~~~~~~~~~~
+	git clone git://git.tuebingen.mpg.de/osl
+	cd osl && make && sudo make install
+	(see http://people.tuebingen.mpg.de/maan/osl/)
+
+Installing paraslash from tarball
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 	./configure && make && sudo make install
 
-From git:
-
-	./autogen.sh && sudo make install
-
-Example for cross-compiling:
+Installing paraslash from git
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+	autoconf && autoheader && make && sudo make install
 
+Example for cross-compiling
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
 	export CROSS_COMPILE='armv6j-hardfloat-linux-gnueabi-'
 	export PATH="/usr/cross/arm/bin:$PATH"
 	export CC=${CROSS_COMPILE}gcc
diff --git a/Makefile.in b/Makefile.in
index 8e7e7760..14015c9b 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -44,10 +44,13 @@ ogg_cppflags := @ogg_cppflags@
 mad_cppflags := @mad_cppflags@
 faad_cppflags := @faad_cppflags@
 curses_cppflags := @curses_cppflags@
+pthread_cppflags := @pthread_cppflags@
 ao_cppflags := @ao_cppflags@
 flac_cppflags := @flac_cppflags@
 samplerate_cppflags := @samplerate_cppflags@
 readline_cppflags := @readline_cppflags@
+alsa_cppflags := @alsa_cppflags@
+oss_cppflags := @oss_cppflags@
 
 clock_gettime_ldflags := @clock_gettime_ldflags@
 id3tag_ldflags := @id3tag_ldflags@
@@ -60,15 +63,15 @@ mad_ldflags := @mad_ldflags@
 flac_ldflags := @flac_ldflags@
 oss_ldflags := @oss_ldflags@
 alsa_ldflags := @alsa_ldflags@
+pthread_ldflags := @pthread_ldflags@
 ao_ldflags := @ao_ldflags@
 readline_ldflags := @readline_ldflags@
 samplerate_ldflags := @samplerate_ldflags@
 osl_ldflags := @osl_ldflags@
-openssl_ldflags := @openssl_ldflags@
-gcrypt_ldflags := @gcrypt_ldflags@
 socket_ldflags := @socket_ldflags@
 nsl_ldflags := @nsl_ldflags@
 curses_ldflags := @curses_ldflags@
 core_audio_ldflags := @core_audio_ldflags@
+crypto_ldflags := @crypto_ldflags@
 
 include Makefile.real
diff --git a/Makefile.real b/Makefile.real
index 6c7b38f2..c5d64058 100644
--- a/Makefile.real
+++ b/Makefile.real
@@ -196,7 +196,7 @@ $(object_dir)/flac%.o $(dep_dir)/flac%.d: CPPFLAGS += $(flac_cppflags)
 $(object_dir)/mp3_afh.o $(dep_dir)/mp3_afh.d: CPPFLAGS += $(id3tag_cppflags)
 $(object_dir)/crypt.o $(dep_dir)/crypt.d: CPPFLAGS += $(openssl_cppflags)
 $(object_dir)/gcrypt.o $(dep_dir)/gcrypt.d: CPPFLAGS += $(gcrypt_cppflags)
-$(object_dir)/ao_write.o $(dep_dir)/ao_write.d: CPPFLAGS += $(ao_cppflags)
+$(object_dir)/alsa%.o $(dep_dir)/alsa%.d: CPPFLAGS += $(alsa_cppflags)
 
 $(object_dir)/interactive.o $(dep_dir)/interactive.d \
 : CPPFLAGS += $(readline_cppflags)
@@ -204,6 +204,12 @@ $(object_dir)/interactive.o $(dep_dir)/interactive.d \
 $(object_dir)/resample_filter.o $(dep_dir)/resample_filter.d \
 : CPPFLAGS += $(samplerate_cppflags)
 
+$(object_dir)/oss_write.o $(dep_dir)/oss_write.d \
+: CPPFLAGS += $(oss_cppflags)
+
+$(object_dir)/ao_write.o $(dep_dir)/ao_write.d \
+: CPPFLAGS += $(ao_cppflags) $(pthread_cppflags)
+
 $(object_dir)/mp3dec_filter.o $(dep_dir)/mp3dec_filter.d \
 : CPPFLAGS += $(mad_cppflags)
 
@@ -264,7 +270,8 @@ $(dep_dir)/%.d: %.c error2.h | $(dep_dir)
 		-e "s@ \([a-zA-Z0-9_]\{1,\}\.completion.h\)@ $(cmdlist_dir)/\1@g" > $@
 
 para_recv para_afh para_play para_server: LDFLAGS += $(id3tag_ldflags)
-para_write para_play para_audiod: LDFLAGS += $(ao_ldflags) $(core_audio_ldflags)
+para_write para_play para_audiod \
+: LDFLAGS += $(ao_ldflags) $(pthread_ldflags) $(core_audio_ldflags)
 para_client para_audioc para_play : LDFLAGS += $(readline_ldflags)
 para_server: LDFLAGS += $(osl_ldflags)
 para_gui: LDFLAGS += $(curses_ldflags)
@@ -272,8 +279,7 @@ para_server \
 para_client \
 para_audiod \
 :LDFLAGS += \
-	$(openssl_ldflags) \
-	$(gcrypt_ldflags)
+	$(crypto_ldflags)
 
 para_audiod \
 para_filter \
diff --git a/NEWS b/NEWS
index b29d4b82..22e16ebe 100644
--- a/NEWS
+++ b/NEWS
@@ -7,8 +7,12 @@ current master branch "magnetic momentum"
 	- On Linux systems, local sockets are now created in the
 	  abstract name space by default. This allows to get rid of
 	  the socket specials in /var/paraslash.
+	- New autoconf macros to avoid duplication in configure.ac.
+	- Status items (as shown by para_gui) are updated correctly
+	  when the meta information of the current audio changes.
 
 Download: ./releases/paraslash-git.tar.bz2 (tarball)
+
 ------------------------------------------
 0.5.4 (2015-01-23) "exponential alignment"
 ------------------------------------------
diff --git a/afh_common.c b/afh_common.c
index edfc8d1d..08bcde90 100644
--- a/afh_common.c
+++ b/afh_common.c
@@ -42,7 +42,7 @@ static struct audio_format_handler afl[] = {
 	},
 	{
 		.name = "ogg",
-#ifdef HAVE_OGGVORBIS
+#if defined(HAVE_OGG) && defined(HAVE_VORBIS)
 		.init = ogg_init,
 #endif
 	},
@@ -58,7 +58,7 @@ static struct audio_format_handler afl[] = {
 	},
 	{
 		.name = "spx",
-#ifdef HAVE_SPEEX
+#if defined(HAVE_OGG) && defined(HAVE_SPEEX)
 		.init = spx_afh_init,
 #endif
 	},
@@ -70,7 +70,7 @@ static struct audio_format_handler afl[] = {
 	},
 	{
 		.name = "opus",
-#ifdef HAVE_OPUS
+#if defined(HAVE_OGG) && defined(HAVE_OPUS)
 		.init = opus_afh_init,
 #endif
 	},
diff --git a/afs.c b/afs.c
index a16252cd..ea0a9f9f 100644
--- a/afs.c
+++ b/afs.c
@@ -195,7 +195,7 @@ static int dispatch_result(int result_shmid, callback_result_handler *handler,
  * copied.  It then notifies the afs process that the callback function \a f
  * should be executed by sending the shared memory identifier (shmid) to the
  * socket.
-
+ *
  * If the callback produces a result, it sends any number of shared memory
  * identifiers back via the socket. For each such identifier received, \a
  * result_handler is called. The contents of the sma identified by the received
@@ -236,8 +236,8 @@ int send_callback_request(callback_function *f, struct osl_object *query,
 	if (ret < 0)
 		goto out;
 
-	*(uint32_t *) buf = afs_socket_cookie;
-	*(int *) (buf + sizeof(afs_socket_cookie)) = query_shmid;
+	*(uint32_t *)buf = afs_socket_cookie;
+	*(int *)(buf + sizeof(afs_socket_cookie)) = query_shmid;
 
 	ret = connect_local_socket(conf.afs_socket_arg);
 	if (ret < 0)
@@ -595,8 +595,9 @@ static void com_select_callback(int fd, const struct osl_object *query)
 			activate_mood_or_playlist(NULL, &num_admissible);
 		}
 	} else
-		ret2 = para_printf(&pb, "activated %s (%d admissible files)\n", current_mop?
-			current_mop : "dummy mood", num_admissible);
+		ret2 = para_printf(&pb, "activated %s (%d admissible files)\n",
+			current_mop?  current_mop : "dummy mood",
+			num_admissible);
 out:
 	if (ret2 >= 0 && pb.offset)
 		pass_buffer_as_shm(fd, SBD_OUTPUT, pb.buf, pb.offset);
@@ -998,7 +999,13 @@ static void create_tables_callback(int fd, const struct osl_object *query)
 {
 	uint32_t table_mask = *(uint32_t *)query->data;
 	int i, ret;
-	struct para_buffer pb = {.buf = NULL};
+	struct para_buffer pb = {
+		.max_size = shm_get_shmmax(),
+		.private_data = &(struct afs_max_size_handler_data) {
+			.fd = fd,
+			.band = SBD_OUTPUT
+		}
+	};
 
 	close_afs_tables();
 	for (i = 0; i < NUM_AFS_TABLES; i++) {
diff --git a/aft.c b/aft.c
index fb0d4fd2..acf75156 100644
--- a/aft.c
+++ b/aft.c
@@ -669,16 +669,13 @@ err:
 int load_afd(int shmid, struct audio_file_data *afd)
 {
 	void *shm_afd;
-	char *buf;
 	int ret;
 
 	ret = shm_attach(shmid, ATTACH_RO, &shm_afd);
 	if (ret < 0)
 		return ret;
 	*afd = *(struct audio_file_data *)shm_afd;
-	buf = shm_afd;
-	buf += sizeof(*afd);
-	load_chunk_table(&afd->afhi, buf);
+	load_chunk_table(&afd->afhi, shm_afd + sizeof(*afd));
 	shm_detach(shm_afd);
 	return 1;
 }
@@ -1121,13 +1118,13 @@ again:
 		return ret;
 	ret = mmap_full_file(d->path, O_RDONLY, &map.data, &map.size, &afd->fd);
 	if (ret < 0)
-		goto err;
+		goto out;
 	hash_function(map.data, map.size, file_hash);
 	ret = hash_compare(file_hash, d->hash);
 	para_munmap(map.data, map.size);
 	if (ret) {
 		ret = -E_HASH_MISMATCH;
-		goto err;
+		goto out;
 	}
 	new_afsi = d->afsi;
 	new_afsi.num_played++;
@@ -1144,7 +1141,7 @@ again:
 	 */
 	afs_event(AFSI_CHANGE, NULL, &aced);
 	ret = save_afd(afd);
-err:
+out:
 	free(afd->afhi.chunk_table);
 	osl_close_disk_object(&chunk_table_obj);
 	if (ret < 0) {
@@ -2103,7 +2100,10 @@ static void com_touch_callback(int fd, const struct osl_object *query)
 	struct touch_action_data tad = {.cto = query->data,
 		.pb = {
 			.max_size = shm_get_shmmax(),
-			.private_data = &fd,
+			.private_data = &(struct afs_max_size_handler_data) {
+				.fd = fd,
+				.band = SBD_OUTPUT
+			},
 			.max_size_handler = afs_max_size_handler
 		}
 	};
@@ -2244,7 +2244,10 @@ static void com_rm_callback(int fd, const struct osl_object *query)
 	struct com_rm_action_data crd = {.flags = *(uint32_t *)query->data,
 		.pb = {
 			.max_size = shm_get_shmmax(),
-			.private_data = &fd,
+			.private_data = &(struct afs_max_size_handler_data) {
+				.fd = fd,
+				.band = SBD_OUTPUT
+			},
 			.max_size_handler = afs_max_size_handler
 		}
 	};
@@ -2386,7 +2389,10 @@ static void com_cpsi_callback(int fd, const struct osl_object *query)
 		.flags = *(unsigned *)query->data,
 		.pb = {
 			.max_size = shm_get_shmmax(),
-			.private_data = &fd,
+			.private_data = &(struct afs_max_size_handler_data) {
+				.fd = fd,
+				.band = SBD_OUTPUT
+			},
 			.max_size_handler = afs_max_size_handler
 		}
 	};
diff --git a/alsa_mix.c b/alsa_mix.c
index 5a46963e..cad58af0 100644
--- a/alsa_mix.c
+++ b/alsa_mix.c
@@ -100,11 +100,13 @@ static bool channel_has_playback(snd_mixer_selem_channel_id_t chn,
 
 static char *alsa_mix_get_channels(struct mixer_handle *handle)
 {
+	int ret;
 	char *list = NULL;
 	snd_mixer_selem_id_t *sid;
 	snd_mixer_elem_t *elem;
 
-	snd_mixer_selem_id_alloca(&sid);
+	ret = snd_mixer_selem_id_malloc(&sid);
+	assert(ret >= 0);
 	elem = snd_mixer_first_elem(handle->mixer);
 	for (; elem; elem = snd_mixer_elem_next(elem)) {
 		char *tmp = list;
@@ -122,6 +124,7 @@ static char *alsa_mix_get_channels(struct mixer_handle *handle)
 			name);
 		free(tmp);
 	}
+	snd_mixer_selem_id_free(sid);
 	return list;
 }
 
@@ -133,7 +136,8 @@ static int alsa_mix_set_channel(struct mixer_handle *h,
 
 	if (!mixer_channel)
 		mixer_channel = "Master";
-	snd_mixer_selem_id_alloca(&sid);
+	ret = snd_mixer_selem_id_malloc(&sid);
+	assert(ret >= 0);
 	snd_mixer_selem_id_set_index(sid, selem_id);
 	snd_mixer_selem_id_set_name(sid, mixer_channel);
 	h->elem = snd_mixer_find_selem(h->mixer, sid);
@@ -141,21 +145,27 @@ static int alsa_mix_set_channel(struct mixer_handle *h,
 		PARA_NOTICE_LOG("unable to find simple control '%s',%i\n",
 			snd_mixer_selem_id_get_name(sid),
 			snd_mixer_selem_id_get_index(sid));
-		return -E_BAD_CHANNEL;
+		ret = -E_BAD_CHANNEL;
+		goto out;
 	}
 	ret = snd_mixer_selem_get_playback_volume_range(h->elem,
 		&h->pmin, &h->pmax);
 	if (ret < 0) {
 		PARA_NOTICE_LOG("unable to get %s range (%s): %s\n",
 			mixer_channel, h->card, snd_strerror(ret));
-		return -E_ALSA_MIX_RANGE;
+		ret = -E_ALSA_MIX_RANGE;
+		goto out;
 	}
 	if (h->pmin >= h->pmax) {
 		PARA_NOTICE_LOG("alsa reported %s range %ld-%ld (%s)\n",
 			mixer_channel, h->pmin, h->pmax, h->card);
-		return -E_ALSA_MIX_RANGE;
+		ret = -E_ALSA_MIX_RANGE;
+		goto out;
 	}
-	return 1;
+	ret = 1;
+out:
+	snd_mixer_selem_id_free(sid);
+	return ret;
 }
 
 static int alsa_mix_get(struct mixer_handle *h)
diff --git a/alsa_write.c b/alsa_write.c
index b0b21f2b..63a7055b 100644
--- a/alsa_write.c
+++ b/alsa_write.c
@@ -74,8 +74,8 @@ static snd_pcm_format_t get_alsa_pcm_format(enum sample_format sf)
 static int alsa_init(struct private_alsa_write_data *pad,
 		struct alsa_write_args_info *conf)
 {
-	snd_pcm_hw_params_t *hwparams;
-	snd_pcm_sw_params_t *swparams;
+	snd_pcm_hw_params_t *hwparams = NULL;
+	snd_pcm_sw_params_t *swparams = NULL;
 	snd_pcm_uframes_t start_threshold, stop_threshold;
 	snd_pcm_uframes_t buffer_size, period_size;
 	snd_output_t *output_log;
@@ -89,7 +89,8 @@ static int alsa_init(struct private_alsa_write_data *pad,
 		SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
 	if (ret < 0)
 		goto fail;
-	snd_pcm_hw_params_alloca(&hwparams);
+	ret = snd_pcm_hw_params_malloc(&hwparams);
+	assert(ret >= 0);
 	msg = "Broken alsa configuration";
 	ret = snd_pcm_hw_params_any(pad->handle, hwparams);
 	if (ret < 0)
@@ -140,7 +141,8 @@ static int alsa_init(struct private_alsa_write_data *pad,
 		goto fail;
 
 	/* software parameter setup */
-	snd_pcm_sw_params_alloca(&swparams);
+	ret = snd_pcm_sw_params_malloc(&swparams);
+	assert(ret >= 0);
 	snd_pcm_sw_params_current(pad->handle, swparams);
 	snd_pcm_sw_params_set_avail_min(pad->handle, swparams, period_size);
 	if (buffer_size < 1)
@@ -190,13 +192,18 @@ static int alsa_init(struct private_alsa_write_data *pad,
 		}
 		snd_output_close(output_log);
 	}
-	return 1;
+	ret = 1;
+	goto out;
 fail:
 	if (ret < 0)
 		PARA_ERROR_LOG("%s: %s\n", msg, snd_strerror(-ret));
 	else
 		PARA_ERROR_LOG("%s\n", msg);
-	return -E_ALSA;
+	ret = -E_ALSA;
+out:
+	snd_pcm_hw_params_free(hwparams);
+	snd_pcm_sw_params_free(swparams);
+	return ret;
 }
 
 static void alsa_write_pre_select(struct sched *s, void *context)
diff --git a/audiod.c b/audiod.c
index 8f246ba5..1f226265 100644
--- a/audiod.c
+++ b/audiod.c
@@ -68,6 +68,30 @@ struct audio_format_info {
 	struct timeval restart_barrier;
 };
 
+/* Describes one instance of a receiver-filter-writer chain. */
+struct slot_info {
+	/* Number of the audio format in this slot. */
+	int format;
+	/* The stream_start status item announced by para_server.  */
+	struct timeval server_stream_start;
+	/* The offset status item announced by para_server. */
+	unsigned offset_seconds;
+	/* The seconds_total status item announced by para_server. */
+	unsigned seconds_total;
+	/* The receiver info associated with this slot. */
+	struct receiver_node *receiver_node;
+	/* The array of filter nodes. */
+	struct filter_node *fns;
+	/* The array of writers attached to the last filter. */
+	struct writer_node *wns;
+};
+
+/** Maximal number of simultaneous instances. */
+#define MAX_STREAM_SLOTS 5
+
+/** Iterate over all slots. */
+#define FOR_EACH_SLOT(_slot) for (_slot = 0; _slot < MAX_STREAM_SLOTS; _slot++)
+
 /**
  * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
  * be associated with a receiver/filter/writer triple. This array holds all
@@ -198,6 +222,35 @@ static int get_audio_format_num(const char *name)
 	return -E_UNSUPPORTED_AUDIO_FORMAT;
 }
 
+/**
+ * Return the flags for the \a decoder_flags status item.
+ *
+ * Allocates a string which contains one octal digit per slot.  Bit zero (value
+ * 1) is set if a receiver is active. Bit one (value 2) and bit three (value 4)
+ * have the analogous meaning for filter and writer, respectively.
+ *
+ * \return String that must be freed by the caller.
+ */
+__malloc char *audiod_get_decoder_flags(void)
+{
+	int i;
+	char flags[MAX_STREAM_SLOTS + 1];
+
+	FOR_EACH_SLOT(i) {
+		struct slot_info *s = &slot[i];
+		char flag = '0';
+		if (s->receiver_node)
+			flag += 1;
+		if (s->fns)
+			flag += 2;
+		if (s->wns)
+			flag += 4;
+		flags[i] = flag;
+	}
+	flags[MAX_STREAM_SLOTS] = '\0';
+	return para_strdup(flags);
+}
+
 static int get_matching_audio_format_nums(const char *re)
 {
 	int i, ret;
@@ -214,28 +267,44 @@ static int get_matching_audio_format_nums(const char *re)
 	return ret;
 }
 
+static int get_play_time_slot_num(void)
+{
+	int i, oldest_slot = -1;
+	struct timeval oldest_wstime = {0, 0};
+
+	FOR_EACH_SLOT(i) {
+		struct slot_info *s = &slot[i];
+		struct timeval wstime;
+		if (!s->wns || !s->wns[0].btrn)
+			continue;
+		btr_get_node_start(s->wns[0].btrn, &wstime);
+		if (oldest_slot >= 0 && tv_diff(&wstime, &oldest_wstime, NULL) > 0)
+			continue;
+		oldest_wstime = wstime;
+		oldest_slot = i;
+	}
+	return oldest_slot;
+}
+
 /**
- * Compute the play time based on information of the given slot.
- *
- * \param slot_num The slot number (negative means: no slot).
+ * Compute the play time based on information of the current slot.
  *
  * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
  * from the status items received from para_server and the start time of the
- * (first) writer of the given slot.
+ * (first) writer of the current slot.
  *
  * It has to take into account that the stream was probably not started at
  * the beginning of the file, that the clock between the server and the client
  * host may differ and that playback of the stream was delayed, e.g. because
- * the prebuffer filter is used in the filter configuration of the given slot.
+ * the prebuffer filter is used in the filter configuration.
  *
- * If no writer is active in the given slot, or \a slot_num is negative
- * (indicating that para_audiod runs in standby mode), an approximation based
- * only on the status items is computed and the returned string is prefixed
- * with "~".
+ * If no writer is active, for example because para_audiod runs in standby
+ * mode, an approximation based only on the status items is computed and the
+ * returned string is prefixed with "~".
  *
  * \return A string that must be freed by the caller.
  */
-char *get_time_string(int slot_num)
+char *get_time_string(void)
 {
 	int ret, seconds = 0, length;
 	struct timeval *tmp, sum, sss, /* server stream start */
@@ -243,6 +312,7 @@ char *get_time_string(int slot_num)
 		wstime, /* writer start time */
 		wtime, /* now - writer start */
 		rskip; /* receiver start - sss */
+	int slot_num = get_play_time_slot_num();
 	struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
 	char *msg;
 
diff --git a/audiod.h b/audiod.h
index c86b6659..94288eec 100644
--- a/audiod.h
+++ b/audiod.h
@@ -13,9 +13,6 @@ enum {AUDIOD_AUDIO_FORMATS_ENUM};
 /** array of audio format names supported by para_audiod */
 extern const char *audio_formats[];
 
-/** maximal number of simultaneous instances */
-#define MAX_STREAM_SLOTS 5
-
 /**
  * the possible modes of operation
  *
@@ -39,41 +36,15 @@ struct audiod_command {
 	const char *help;
 };
 
-/**
- * Describes one instance of a receiver-filter-writer chain.
- *
- * \sa receiver_node, receiver, filter, filter_node, writer, writer_node,
- * writer_node_group.
- */
-struct slot_info {
-	/** Number of the audio format in this slot. */
-	int format;
-	/** The stream_start status item announced by para_server.  */
-	struct timeval server_stream_start;
-	/** The offset status item announced by para_server. */
-	unsigned offset_seconds;
-	/** The seconds_total status item announced by para_server. */
-	unsigned seconds_total;
-	/** The receiver info associated with this slot. */
-	struct receiver_node *receiver_node;
-	/** The array of filter nodes. */
-	struct filter_node *fns;
-	/** The array of writers attached to the last filter. */
-	struct writer_node *wns;
-};
-
-extern struct slot_info slot[MAX_STREAM_SLOTS];
+__malloc char *audiod_get_decoder_flags(void);
 extern struct audiod_args_info conf;
 extern int audiod_status;
 
 int handle_connect(int accept_fd, fd_set *rfds);
 void audiod_status_dump(bool force);
-char *get_time_string(int slot_num);
+char *get_time_string(void);
 struct btr_node *audiod_get_btr_root(void);
 
 void stat_client_write_item(int item_num);
 void clear_and_dump_items(void);
 void close_stat_clients(void);
-
-/** iterate over all slots */
-#define FOR_EACH_SLOT(_slot) for (_slot = 0; _slot < MAX_STREAM_SLOTS; _slot++)
diff --git a/audiod_command.c b/audiod_command.c
index 7e68d2d2..b847e5aa 100644
--- a/audiod_command.c
+++ b/audiod_command.c
@@ -216,46 +216,6 @@ __malloc static char *audiod_status_string(void)
 	return para_strdup(status);
 }
 
-static int get_play_time_slot_num(void)
-{
-	int i, oldest_slot = -1;
-	struct timeval oldest_wstime = {0, 0};
-
-	FOR_EACH_SLOT(i) {
-		struct slot_info *s = &slot[i];
-		struct timeval wstime;
-		if (!s->wns || !s->wns[0].btrn)
-			continue;
-		btr_get_node_start(s->wns[0].btrn, &wstime);
-		if (oldest_slot >= 0 && tv_diff(&wstime, &oldest_wstime, NULL) > 0)
-			continue;
-		oldest_wstime = wstime;
-		oldest_slot = i;
-	}
-	//PARA_CRIT_LOG("oldest slot: %d\n", oldest_slot);
-	return oldest_slot;
-}
-
-__malloc static char *decoder_flags(void)
-{
-	int i;
-	char flags[MAX_STREAM_SLOTS + 1];
-
-	FOR_EACH_SLOT(i) {
-		struct slot_info *s = &slot[i];
-		char flag = '0';
-		if (s->receiver_node)
-			flag += 1;
-		if (s->fns)
-			flag += 2;
-		if (s->wns)
-			flag += 4;
-		flags[i] = flag;
-	}
-	flags[MAX_STREAM_SLOTS] = '\0';
-	return para_strdup(flags);
-}
-
 static int dump_commands(int fd)
 {
 	char *buf = para_strdup(""), *tmp = NULL;
@@ -513,11 +473,10 @@ out:
  */
 void audiod_status_dump(bool force)
 {
-	int slot_num = get_play_time_slot_num();
 	char *old, *new;
 
 	old = stat_item_values[SI_PLAY_TIME];
-	new = get_time_string(slot_num);
+	new = get_time_string();
 	if (new) {
 		if (force || !old || strcmp(old, new)) {
 			free(old);
@@ -546,7 +505,7 @@ void audiod_status_dump(bool force)
 		free(new);
 
 	old = stat_item_values[SI_DECODER_FLAGS];
-	new = decoder_flags();
+	new = audiod_get_decoder_flags();
 	if (force || !old || strcmp(old, new)) {
 		free(old);
 		stat_item_values[SI_DECODER_FLAGS] = new;
diff --git a/command.c b/command.c
index 0baad5dc..175b496c 100644
--- a/command.c
+++ b/command.c
@@ -772,7 +772,7 @@ static int com_tasks(struct command_context *cc)
  * check if perms are sufficient to exec a command having perms cmd_perms.
  * Returns 0 if perms are sufficient, -E_PERM otherwise.
  */
-static int check_perms(unsigned int perms, struct server_command *cmd_ptr)
+static int check_perms(unsigned int perms, const struct server_command *cmd_ptr)
 {
 	PARA_DEBUG_LOG("checking permissions\n");
 	return (cmd_ptr->perms & perms) < cmd_ptr->perms ? -E_PERM : 0;
diff --git a/command.h b/command.h
index 6d220207..d28db038 100644
--- a/command.h
+++ b/command.h
@@ -11,7 +11,7 @@ struct command_context {
 	/** Argument vector. */
 	char **argv;
 	/** The command being executed. */
-	struct server_command *cmd;
+	const struct server_command *cmd;
 	/** File descriptor and crypto keys. */
 	struct stream_cipher_context scc;
 };
diff --git a/configure.ac b/configure.ac
index 79b41a3a..8095d33a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -24,6 +24,46 @@ AC_DEFUN([objlist_to_errlist],[ \
 	make_errlist_defines($@) \
 	[const char **para_errlist[[]]] = {make_para_errlists($@)} \
 ])
+AC_DEFUN([LIB_ARG_WITH], [
+	AC_ARG_WITH($1-headers, [AS_HELP_STRING(--with-$1-headers=dir,
+		[look for $1 headers in dir])])
+	AC_ARG_WITH($1-libs, [AS_HELP_STRING(--with-$1-libs=dir,
+		[look for $1 libraries in dir])])
+	if test -n "$with_$1_headers"; then
+		$1_cppflags="-I$with_$1_headers"
+		CPPFLAGS="$CPPFLAGS $$1_cppflags"
+	fi
+	if test -n "$with_$1_libs"; then
+		$1_ldflags="-L$with_$1_libs $2"
+	else
+		$1_ldflags="$2"
+	fi
+	LDFLAGS="$LDFLAGS $$1_ldflags"
+])
+
+AC_DEFUN([STASH_FLAGS], [
+	OLD_CPPFLAGS="$CPPFLAGS"
+	OLD_LDFLAGS="$LDFLAGS"
+	OLD_LIBS="$LIBS"
+])
+
+AC_DEFUN([UNSTASH_FLAGS], [
+	CPPFLAGS="$OLD_CPPFLAGS"
+	LDFLAGS="$OLD_LDFLAGS"
+	LIBS="$OLD_LIBS"
+])
+AC_DEFUN([LIB_SUBST_FLAGS], [
+	if test "$HAVE_[]m4_toupper([$1])" == 'yes'; then
+		AC_DEFINE(HAVE_[]m4_toupper([$1]), 1,
+			define to 1 to turn on $1 support)
+	else
+		$1_cppflags=
+		$1_ldflags=
+	fi
+	AC_SUBST(HAVE_[]m4_toupper([$1]))
+	AC_SUBST($1_cppflags)
+	AC_SUBST($1_ldflags)
+])
 
 AC_PATH_PROG(UNAMEPATH, uname, no)
 if test "$UNAMEPATH" = "no"; then
@@ -69,42 +109,32 @@ fi
 if test "$clock_gettime_lib" = "rt"; then
 	AC_SUBST(clock_gettime_ldflags, -lrt)
 fi
-########################################################################### osl
-have_osl=yes
-OLD_CPPFLAGS="$CPPFLAGS"
-OLD_LDFLAGS="$LDFLAGS"
-OLD_LIBS="$LIBS"
-AC_ARG_WITH(osl_headers, [AS_HELP_STRING(--with-osl-headers=dir,
-	[look for osl.h also in dir])])
-if test -n "$with_osl_headers"; then
-	osl_cppflags="-I$with_osl_headers"
-	CPPFLAGS="$CPPFLAGS $osl_cppflags"
-fi
-AC_ARG_WITH(osl_libs, [AS_HELP_STRING(--with-osl-libs=dir,
-	[look for libosl also in dir])])
-if test -n "$with_osl_libs"; then
-	osl_libs="-L$with_osl_libs"
-	LDFLAGS="$LDFLAGS $osl_libs"
-fi
 
-AC_CHECK_HEADER(osl.h, [], have_osl=no)
-AC_CHECK_LIB([osl], [osl_open_table], [], have_osl=no)
-if test "$have_osl" = "yes"; then
-	AC_SUBST(osl_cppflags)
-	osl_ldflags="$osl_libs -losl"
-	AC_SUBST(osl_ldflags)
-else
-	AC_MSG_WARN([libosl not found, can not build para_server.
-Download libosl at
-	http://people.tuebingen.mpg.de/maan/osl/
-or execute
-	git clone git://git.tuebingen.mpg.de/osl
-	])
-fi
-CPPFLAGS="$OLD_CPPFLAGS"
-LDFLAGS="$OLD_LDFLAGS"
-LIBS="$OLD_LIBS"
-########################################################################### crypto
+########################################################################### osl
+STASH_FLAGS
+LIB_ARG_WITH([osl], [-losl])
+HAVE_OSL=yes
+AC_CHECK_HEADER(osl.h, [], [HAVE_OSL=no])
+AC_CHECK_LIB([osl], [osl_open_table], [], [HAVE_OSL=no])
+LIB_SUBST_FLAGS(osl)
+UNSTASH_FLAGS
+######################################################################## openssl
+STASH_FLAGS
+HAVE_OPENSSL=yes
+LIB_ARG_WITH([openssl], [-lssl -lcrypto])
+AC_CHECK_HEADER(openssl/ssl.h, [], [HAVE_OPENSSL=no])
+AC_CHECK_LIB([crypto], [RAND_bytes], [], [HAVE_OPENSSL=no])
+LIB_SUBST_FLAGS(openssl)
+UNSTASH_FLAGS
+######################################################################### gcrypt
+STASH_FLAGS
+HAVE_GCRYPT=yes
+LIB_ARG_WITH([gcrypt], [-lgcrypt])
+AC_CHECK_HEADER(gcrypt.h, [], [HAVE_GCRYPT=no])
+AC_CHECK_LIB([gcrypt], [gcry_randomize], [], [HAVE_GCRYPT=no])
+LIB_SUBST_FLAGS(gcrypt)
+UNSTASH_FLAGS
+######################################################################### crypto
 AC_ARG_ENABLE(cryptolib, [AS_HELP_STRING(--enable-cryptolib=lib, [
 	Force using crypto library "lib". This package requires either
 	openssl or libgcrypt being installed. Possible values for "lib"
@@ -112,96 +142,32 @@ AC_ARG_ENABLE(cryptolib, [AS_HELP_STRING(--enable-cryptolib=lib, [
 	openssl is tried first. If openssl was not found, gcrypt is
 	tried next.])])
 
+CRYPTOLIB="$enable_cryptolib"
 case "$enable_cryptolib" in
-	"openssl") check_openssl="yes"; check_gcrypt="no";;
-	"gcrypt") check_openssl="no"; check_gcrypt="yes";;
-	"") check_openssl="yes"; check_gcrypt="yes";;
-	*) AC_MSG_ERROR([invalid value "$enable_cryptolib" for --enable-cryptolib]);;
-esac
-###################################################################### openssl
-if test "$check_openssl" = "yes"; then
-	OLD_CPPFLAGS="$CPPFLAGS"
-	OLD_LDFLAGS="$LDFLAGS"
-	OLD_LIBS="$LIBS"
-	have_openssl="yes"
-	AC_ARG_WITH(openssl_headers, [AS_HELP_STRING(--with-openssl-headers=dir,
-		[look for openssl headers also in dir])])
-	if test -n "$with_openssl_headers"; then
-		openssl_cppflags="-I$with_openssl_headers"
-		CPPFLAGS="$CPPFLAGS $openssl_cppflags"
-	fi
-	AC_ARG_WITH(openssl_libs, [AS_HELP_STRING(--with-openssl-libs=dir,
-		[look for openssl libraries also in dir])])
-	if test -n "$with_openssl_libs"; then
-		openssl_libs="-L$with_openssl_libs"
-		LDFLAGS="$LDFLAGS $openssl_libs"
+"openssl")
+	test $HAVE_OPENSSL = no && AC_MSG_ERROR(openssl not found)
+	crypto_ldflags="$openssl_ldflags"
+	;;
+"gcrypt")
+	test $HAVE_GCRYPT = no && AC_MSG_ERROR(gcrypt not found)
+	crypto_ldflags="$gcrypt_ldflags"
+	;;
+"")
+	crypto_ldflags=
+	if test $HAVE_GCRYPT = yes; then
+		CRYPTOLIB=gcrypt
+		crypto_ldflags="$gcrypt_ldflags"
 	fi
-	AC_CHECK_HEADER(openssl/ssl.h, [], [have_openssl="no"])
-	AC_CHECK_LIB([crypto], [RAND_bytes], [], [have_openssl="no"])
-	if test "$have_openssl" = "no" -a -z "$with_openssl_headers$with_openssl_libs"; then
-		# try harder: openssl is sometimes installed in /usr/local/ssl
-		openssl_cppflags="-I/usr/local/ssl/include"
-		CPPFLAGS="$CPPFLAGS $openssl_cppflags"
-		openssl_libs="-L/usr/local/ssl/lib"
-		LDFLAGS="$LDFLAGS $openssl_libs"
-		# clear cache
-		unset ac_cv_header_openssl_ssl_h 2> /dev/null
-		unset ac_cv_lib_crypto_RAND_bytes 2> /dev/null
-		AC_CHECK_HEADER(openssl/ssl.h, [have_openssl="yes"], [])
-		if test "$have_openssl" = "yes"; then
-			AC_CHECK_LIB([crypto], [RAND_bytes], [], [have_openssl="no"])
-		fi
+	if test $HAVE_OPENSSL = yes; then
+		CRYPTOLIB=openssl
+		crypto_ldflags="$openssl_ldflags"
 	fi
-	if test "$have_openssl" = "yes"; then
-		AC_DEFINE(HAVE_OPENSSL, 1, [define to 1 to turn on openssl support])
-		AC_SUBST(openssl_cppflags)
-		openssl_ldflags="$openssl_libs -lssl -lcrypto"
-		AC_SUBST(openssl_ldflags)
-
-		check_gcrypt="no"
-	else
-		AC_MSG_WARN([openssl libraries not found])
-	fi
-	CPPFLAGS="$OLD_CPPFLAGS"
-	LDFLAGS="$OLD_LDFLAGS"
-	LIBS="$OLD_LIBS"
-else
-	have_openssl="no"
-fi
-########################################################################### gcrypt
-if test "$check_gcrypt" = "yes"; then
-	OLD_CPPFLAGS="$CPPFLAGS"
-	OLD_LDFLAGS="$LDFLAGS"
-	OLD_LIBS="$LIBS"
-	have_gcrypt="yes"
-	AC_ARG_WITH(gcrypt_headers, [AS_HELP_STRING(--with-gcrypt-headers=dir,
-		[look for gcrypt headers also in dir])])
-	if test -n "$with_gcrypt_headers"; then
-		gcrypt_cppflags="-I$with_gcrypt_headers"
-		CPPFLAGS="$CPPFLAGS $gcrypt_cppflags"
-	fi
-	AC_ARG_WITH(gcrypt_libs, [AS_HELP_STRING(--with-gcrypt-libs=dir,
-		[look for libgcrypt also in dir])])
-	if test -n "$with_gcrypt_libs"; then
-		gcrypt_libs="-L$with_gcrypt_libs"
-		LDFLAGS="$LDFLAGS $gcrypt_libs"
-	fi
-	AC_CHECK_HEADER(gcrypt.h, [], [have_gcrypt="no"])
-	AC_CHECK_LIB([gcrypt], [gcry_randomize], [], [have_gcrypt="no"])
-	if test "$have_gcrypt" = "yes"; then
-		AC_DEFINE(HAVE_GCRYPT, 1, [define to 1 to turn on gcrypt support])
-		AC_SUBST(gcrypt_cppflags)
-		gcrypt_ldflags="$gcrypt_libs -lgcrypt"
-		AC_SUBST(gcrypt_ldflags)
-	else
-		AC_MSG_WARN([gcrypt library not found])
-	fi
-	CPPFLAGS="$OLD_CPPFLAGS"
-	LDFLAGS="$OLD_LDFLAGS"
-	LIBS="$OLD_LIBS"
-else
-	have_gcrypt="no"
-fi
+	;;
+*)
+	AC_MSG_ERROR([invalid value "$enable_cryptolib" for --enable-cryptolib])
+	;;
+esac
+AC_SUBST(crypto_ldflags)
 ########################################################################### libsocket
 AC_CHECK_LIB([c], [socket],
 	[socket_ldlflags=],
@@ -237,39 +203,14 @@ AC_CHECK_DECL(
 )
 AC_SUBST(ggo_descriptions_declared)
 ########################################################################### curses
-have_curses="yes"
-OLD_CPPFLAGS="$CPPFLAGS"
-OLD_LDFLAGS="$LDFLAGS"
-OLD_LIBS="$LIBS"
-AC_ARG_WITH(curses_headers, [AS_HELP_STRING(--with-curses-headers=dir,
-	[look for curses.h also in dir])])
-if test -n "$with_curses_headers"; then
-	curses_cppflags="-I$with_curses_headers"
-	CPPFLAGS="$CPPFLAGS $curses_cppflags"
-fi
-AC_ARG_WITH(curses_libs, [AS_HELP_STRING(--with-curses-libs=dir,
-	[look for libcurses also in dir])])
-if test -n "$with_curses_libs"; then
-	curses_libs="-L$with_curses_libs"
-	LDFLAGS="$LDFLAGS $curses_libs"
-fi
-AC_CHECK_HEADER(curses.h, [], [
-	have_curses="no"
-])
-curses_ldflags="$curses_libs"
-AC_CHECK_LIB([ncursesw], [initscr],
-	[curses_ldflags="$curses_libs -lncursesw"], [
-		AC_CHECK_LIB([curses], [initscr],
-			[curses_ldflags="$curses_libs -lcurses"],
-			[have_curses="no"]
-		)
-	]
-)
-AC_SUBST(curses_cppflags)
-AC_SUBST(curses_ldflags)
-CPPFLAGS="$OLD_CPPFLAGS"
-LDFLAGS="$OLD_LDFLAGS"
-LIBS="$OLD_LIBS"
+STASH_FLAGS
+LIB_ARG_WITH([curses], [])
+HAVE_CURSES=yes
+AC_CHECK_HEADER(curses.h, [], [HAVE_CURSES=no])
+AC_SEARCH_LIBS([initscr], [ncursesw curses], [], [HAVE_CURSES=no])
+curses_ldflags="$curses_ldflags $LIBS"
+LIB_SUBST_FLAGS(curses)
+UNSTASH_FLAGS
 ########################################################################### ip_mreqn
 AC_MSG_CHECKING(for struct ip_mreqn (UDPv4 multicast))
 AC_LINK_IFELSE([AC_LANG_PROGRAM([[
@@ -301,488 +242,152 @@ if test ${have_core_audio} = yes; then
 	AC_SUBST(core_audio_ldflags)
 	AC_DEFINE(HAVE_CORE_AUDIO, 1, define to 1 on Mac Os X)
 fi
-####################################################### ogg/vorbis/speex/opus
-have_ogg="yes"
-OLD_CPPFLAGS="$CPPFLAGS"
-OLD_LDFLAGS="$LDFLAGS"
-OLD_LIBS="$LIBS"
-AC_ARG_WITH(ogg_headers, [AS_HELP_STRING(--with-ogg-headers=dir,
-	[look for ogg headers also in dir])])
-AC_ARG_WITH(ogg_libs, [AS_HELP_STRING(--with-ogg-libs=dir,
-	[look for ogg libs also in dir])])
-AC_ARG_WITH(vorbis_headers, [AS_HELP_STRING(--with-vorbis-headers=dir,
-	[look for vorbis headers also in dir])])
-AC_ARG_WITH(vorbis_libs, [AS_HELP_STRING(--with-vorbis-libs=dir,
-	[look for vorbis libs also in dir])])
-AC_ARG_WITH(speex_headers, [AS_HELP_STRING(--with-speex-headers=dir,
-	[look for speex headers also in dir])])
-AC_ARG_WITH(speex_libs, [AS_HELP_STRING(--with-speex-libs=dir,
-	[look for speex libs also in dir])])
-AC_ARG_WITH(opus_headers, [AS_HELP_STRING(--with-opus-headers=dir,
-	[look for opus headers also in dir])])
-AC_ARG_WITH(opus_libs, [AS_HELP_STRING(--with-opus-libs=dir,
-	[look for opus libs also in dir])])
-
-if test -n "$with_ogg_headers"; then
-	ogg_cppflags="-I$with_ogg_headers"
-	CPPFLAGS="$CPPFLAGS $ogg_cppflags"
-fi
-if test -n "$with_ogg_libs"; then
-	ogg_libs="-L$with_ogg_libs"
-	LDFLAGS="$LDFLAGS $ogg_libs"
-fi
-AC_CHECK_HEADERS([ogg/ogg.h], [], [ have_ogg="no"; ])
-AC_CHECK_LIB([ogg], [ogg_stream_init], [], [ have_ogg="no" ])
-CPPFLAGS="$OLD_CPPFLAGS"
-LDFLAGS="$OLD_LDFLAGS"
-LIBS="$OLD_LIBS"
-
-have_vorbis="yes"
-have_speex="yes"
-have_opus="yes"
-if test "$have_ogg" = "yes"; then
-	OLD_CPPFLAGS="$CPPFLAGS"
-	OLD_LDFLAGS="$LDFLAGS"
-	OLD_LIBS="$LIBS"
-	# vorbis
-	if test -n "$with_vorbis_headers"; then
-		vorbis_cppflags="-I$with_vorbis_headers"
-		CPPFLAGS="$CPPFLAGS $vorbis_cppflags"
-	fi
-	if test -n "$with_vorbis_libs"; then
-		vorbis_libs="-L$with_vorbis_libs"
-		LDFLAGS="$LDFLAGS $vorbis_libs"
-	fi
-	AC_CHECK_HEADERS([vorbis/codec.h], [], [ have_vorbis="no" ])
-	AC_CHECK_LIB([vorbis], [vorbis_info_init], [], [ have_vorbis="no" ])
-	CPPFLAGS="$OLD_CPPFLAGS"
-	LDFLAGS="$OLD_LDFLAGS"
-	LIBS="$OLD_LIBS"
-
-	# speex
-	OLD_CPPFLAGS="$CPPFLAGS"
-	OLD_LDFLAGS="$LDFLAGS"
-	OLD_LIBS="$LIBS"
-	if test -n "$with_speex_headers"; then
-		speex_cppflags="-I$with_speex_headers"
-		CPPFLAGS="$CPPFLAGS $speex_cppflags"
-	fi
-	if test -n "$with_speex_libs"; then
-		speex_libs="-L$with_speex_libs"
-		LDFLAGS="$LDFLAGS $speex_libs"
-	fi
-	AC_CHECK_LIB([speex], [speex_decoder_init], [], [ have_speex="no" ])
-	AC_CHECK_HEADERS([speex/speex.h], [], [ have_speex="no" ])
-	CPPFLAGS="$OLD_CPPFLAGS"
-	LDFLAGS="$OLD_LDFLAGS"
-	LIBS="$OLD_LIBS"
-
-	# opus
-	OLD_CPPFLAGS="$CPPFLAGS"
-	OLD_LDFLAGS="$LDFLAGS"
-	OLD_LIBS="$LIBS"
-	if test -n "$with_opus_headers"; then
-		opus_cppflags="-I$with_opus_headers"
-		CPPFLAGS="$CPPFLAGS $opus_cppflags"
-	fi
-	if test -n "$with_opus_libs"; then
-		opus_libs="-L$with_opus_libs"
-		LDFLAGS="$LDFLAGS $opus_libs"
-	fi
-	AC_CHECK_LIB([opus], [opus_multistream_decode], [], [ have_opus="no" ])
-	AC_CHECK_HEADERS([opus/opus.h], [], [ have_opus="no" ])
-	CPPFLAGS="$OLD_CPPFLAGS"
-	LDFLAGS="$OLD_LDFLAGS"
-	LIBS="$OLD_LIBS"
-else
-	AC_MSG_WARN([vorbis/speex/opus depend on libogg, which was not detected])
-	have_vorbis="no"
-	have_speex="no"
-	have_opus="no"
-fi
+########################################################################### ogg
+STASH_FLAGS
+LIB_ARG_WITH([ogg], [-logg])
+HAVE_OGG=yes
+AC_CHECK_HEADERS([ogg/ogg.h], [], [HAVE_OGG=no])
+AC_CHECK_LIB([ogg], [ogg_stream_init], [], [HAVE_OGG=no])
+LIB_SUBST_FLAGS(ogg)
+UNSTASH_FLAGS
+######################################################################### vorbis
+STASH_FLAGS
+LIB_ARG_WITH([vorbis], [-lvorbis -lvorbisfile])
+HAVE_VORBIS=yes
+AC_CHECK_HEADERS([vorbis/codec.h], [], [HAVE_VORBIS=no])
+AC_CHECK_LIB([vorbis], [vorbis_info_init], [], [HAVE_VORBIS=no])
+LIB_SUBST_FLAGS(vorbis)
+UNSTASH_FLAGS
+######################################################################### speex
+STASH_FLAGS
+LIB_ARG_WITH([speex], [-lspeex])
+HAVE_SPEEX=yes
+AC_CHECK_HEADERS([speex/speex.h], [], [HAVE_SPEEX=no])
+AC_CHECK_LIB([speex], [speex_decoder_init], [], [HAVE_SPEEX=no])
+LIB_SUBST_FLAGS(speex)
+UNSTASH_FLAGS
+######################################################################### opus
+STASH_FLAGS
+LIB_ARG_WITH([opus], [-lopus])
+HAVE_OPUS=yes
+AC_CHECK_HEADERS([opus/opus.h], [], [HAVE_OPUS=no])
+AC_CHECK_LIB([opus], [opus_multistream_decode], [], [HAVE_OPUS=no])
+LIB_SUBST_FLAGS(opus)
+UNSTASH_FLAGS
+########################################################################### flac
+STASH_FLAGS
+LIB_ARG_WITH([flac], [-lFLAC -lm])
+HAVE_FLAC=yes
+AC_CHECK_HEADER(FLAC/stream_decoder.h, [], HAVE_FLAC=no)
+AC_CHECK_LIB([FLAC], [FLAC__stream_decoder_init_file], [], HAVE_FLAC=no)
+LIB_SUBST_FLAGS(flac)
+UNSTASH_FLAGS
 
-msg="support in para_server/para_filter/para_afh"
-if test "$have_vorbis" = "yes" || \
-		test "$have_speex" = "yes" || \
-		test "$have_opus" = "yes"; then
-	AC_SUBST(ogg_cppflags)
-	ogg_ldflags="$ogg_libs -logg"
-	if test "$OSTYPE" = "Darwin"; then
-		ogg_ldflags="-Wl,-bind_at_load $ogg_ldflags"
-	fi
-	AC_SUBST(ogg_ldflags)
-fi
-if test "$have_vorbis" = "yes"; then
-	AC_DEFINE(HAVE_OGGVORBIS, 1, define to 1 to turn on ogg/vorbis support)
-	AC_SUBST(vorbis_cppflags)
-	vorbis_ldflags="$vorbis_libs -lvorbis -lvorbisfile"
-	AC_SUBST(vorbis_ldflags)
-fi
-if test "$have_speex" = "yes"; then
-	AC_DEFINE(HAVE_SPEEX, 1, define to 1 to turn on ogg/speex support)
-	AC_SUBST(speex_cppflags)
-	speex_ldflags="$speex_libs -lspeex"
-	AC_SUBST(speex_ldflags)
-else
-	AC_MSG_WARN([no ogg/speex $msg])
-fi
-if test "$have_opus" = "yes"; then
-	AC_DEFINE(HAVE_OPUS, 1, define to 1 to turn on ogg/opus support)
-	AC_SUBST(opus_cppflags)
-	opus_ldflags="$opus_libs -lopus"
-	AC_SUBST(opus_ldflags)
-	audio_format_handlers="$audio_format_handlers opus"
-else
-	AC_MSG_WARN([no ogg/opus $msg])
-fi
+# some helper functions for codecs which use the ogg container format
+AC_DEFUN([NEED_OGG_OBJECTS], [{
+	test "$HAVE_OGG" = 'yes' -a \( \
+		 "$HAVE_VORBIS" = 'yes' \
+		-o "$HAVE_SPEEX" = 'yes' \
+		-o "$HAVE_OPUS" = 'yes' \
+		-o "$HAVE_FLAC" = 'yes' \
+	\)
+}])
+AC_DEFUN([NEED_VORBIS_OBJECTS], [{
+	test "$HAVE_OGG" = 'yes' -a "$HAVE_VORBIS" = 'yes'
+}])
+AC_DEFUN([NEED_SPEEX_OBJECTS], [{
+	test "$HAVE_OGG" = 'yes' -a "$HAVE_SPEEX" = 'yes'
+}])
+AC_DEFUN([NEED_OPUS_OBJECTS], [{
+	test "$HAVE_OGG" = 'yes' -a "$HAVE_OPUS" = 'yes'
+}])
+AC_DEFUN([NEED_FLAC_OBJECTS], [{
+	test "$HAVE_OGG" = 'yes' -a "$HAVE_FLAC" = 'yes'
+}])
 ########################################################################### faad
-have_faad=yes
-OLD_CPPFLAGS="$CPPFLAGS"
-OLD_LDFLAGS="$LDFLAGS"
-OLD_LIBS="$LIBS"
-AC_ARG_WITH(faad_headers, [AS_HELP_STRING(--with-faad-headers=dir,
-	[look for neaacdec.h also in dir])])
-if test -n "$with_faad_headers"; then
-	faad_cppflags="-I$with_faad_headers"
-	CPPFLAGS="$CPPFLAGS $faad_cppflags"
-fi
-AC_ARG_WITH(faad_libs, [AS_HELP_STRING(--with-faad-libs=dir,
-	[look for libfaad also in dir])])
-if test -n "$with_faad_libs"; then
-	faad_libs="-L$with_faad_libs"
-	LDFLAGS="$LDFLAGS $faad_libs"
-fi
-AC_CHECK_HEADER(neaacdec.h, [], have_faad=no)
-AC_CHECK_LIB([faad], [NeAACDecOpen], [], have_faad=no)
-if test "$have_faad" = "yes"; then
-	AC_DEFINE(HAVE_FAAD, 1, define to 1 if you want to build the aacdec filter)
-	AC_SUBST(faad_cppflags)
-	faad_ldflags="$faad_libs -lfaad"
-	AC_SUBST(faad_ldflags)
-fi
-CPPFLAGS="$OLD_CPPFLAGS"
-LDFLAGS="$OLD_LDFLAGS"
-LIBS="$OLD_LIBS"
+STASH_FLAGS
+LIB_ARG_WITH([faad], [-lfaad])
+HAVE_FAAD=yes
+AC_CHECK_HEADER(neaacdec.h, [], HAVE_FAAD=no)
+AC_CHECK_LIB([faad], [NeAACDecOpen], [], HAVE_FAAD=no)
+LIB_SUBST_FLAGS(faad)
+UNSTASH_FLAGS
 ########################################################################### mad
-have_mad="yes"
-OLD_CPPFLAGS="$CPPFLAGS"
-OLD_LDFLAGS="$LDFLAGS"
-OLD_LIBS="$LIBS"
-
-AC_ARG_WITH(mad_headers, [AS_HELP_STRING(--with-mad-headers=dir,
-	[look for mad.h also in dir])])
-if test -n "$with_mad_headers"; then
-	mad_cppflags="-I$with_mad_headers"
-	CPPFLAGS="$CPPFLAGS $mad_cppflags"
-fi
-AC_ARG_WITH(mad_libs, [AS_HELP_STRING(--with-mad-libs=dir,
-	[look for libmad also in dir])])
-if test -n "$with_mad_libs"; then
-	mad_libs="-L$with_mad_libs"
-	LDFLAGS="$LDFLAGS $mad_libs"
-fi
-AC_CHECK_HEADERS([mad.h], [], [
-	have_mad="no"
-])
-AC_CHECK_LIB([mad], [mad_stream_init], [], [
-	have_mad="no"
-])
-if test "$have_mad" = "yes"; then
-	AC_DEFINE(HAVE_MAD, 1, define to 1 if you want to build the mp3dec filter)
-	AC_SUBST(mad_cppflags)
-	mad_ldflags="$mad_libs -lmad"
-	AC_SUBST(mad_ldflags)
-else
-	AC_MSG_WARN([no mp3dec support in para_audiod/para_filter])
-fi
-CPPFLAGS="$OLD_CPPFLAGS"
-LDFLAGS="$OLD_LDFLAGS"
-LIBS="$OLD_LIBS"
+STASH_FLAGS
+LIB_ARG_WITH([mad], [-lmad])
+HAVE_MAD=yes
+AC_CHECK_HEADER(mad.h, [], HAVE_MAD=no)
+AC_CHECK_LIB([mad], [mad_stream_init], [], HAVE_MAD=no)
+LIB_SUBST_FLAGS(mad)
+UNSTASH_FLAGS
 ###################################################################### libid3tag
-OLD_CPPFLAGS="$CPPFLAGS"
-OLD_LDFLAGS="$LDFLAGS"
-OLD_LIBS="$LIBS"
-
-have_libid3tag="yes"
-AC_ARG_WITH(id3tag_headers, [AS_HELP_STRING(--with-id3tag-headers=dir,
-	[look for id3tag header files also in dir])])
-if test -n "$with_id3tag_headers"; then
-	id3tag_cppflags="-I$with_id3tag_headers"
-	CPPFLAGS="$CPPFLAGS $id3tag_cppflags"
-fi
-AC_ARG_WITH(id3tag_libs, [AS_HELP_STRING(--with-id3tag-libs=dir,
-	[look for id3tag libs also in dir])])
-if test -n "$with_id3tag_libs"; then
-	id3tag_libs="-L$with_id3tag_libs"
-	LDFLAGS="$LDFLAGS $id3tag_libs"
-fi
-
-AC_MSG_CHECKING(for libid3tag)
-AC_LINK_IFELSE([AC_LANG_PROGRAM([[
-	#include <id3tag.h>
-]], [[
-	struct id3_tag t = {.flags = 0};
-]])],[],[have_libid3tag=no])
-AC_MSG_RESULT($have_libid3tag)
-
-if test ${have_libid3tag} = yes; then
-	AC_DEFINE(HAVE_LIBID3TAG, 1, define to 1 you have libid3tag)
-	AC_SUBST(id3tag_cppflags)
-	AC_SUBST(id3tag_ldflags, "$id3tag_libs -lid3tag -lz")
-fi
-CPPFLAGS="$OLD_CPPFLAGS"
-LDFLAGS="$OLD_LDFLAGS"
-LIBS="$OLD_LIBS"
-########################################################################### flac
-OLD_CPPFLAGS="$CPPFLAGS"
-OLD_LDFLAGS="$LDFLAGS"
-OLD_LIBS="$LIBS"
-
-have_flac="yes"
-AC_ARG_WITH(flac_headers, [AS_HELP_STRING(--with-flac-headers=dir,
-	[look for flac headers also in dir])])
-if test -n "$with_flac_headers"; then
-	flac_cppflags="-I$with_flac_headers"
-	CPPFLAGS="$CPPFLAGS $flac_cppflags"
-fi
-AC_ARG_WITH(flac_libs, [AS_HELP_STRING(--with-flac-libs=dir,
-	[look for flac libs also in dir])])
-if test -n "$with_flac_libs"; then
-	flac_libs="-L$with_flac_libs"
-	LDFLAGS="$LDFLAGS $flac_libs"
-fi
-AC_CHECK_HEADER(FLAC/stream_decoder.h, [], have_flac=no)
-AC_CHECK_LIB([FLAC], [FLAC__stream_decoder_init_file], [], [
-	# nope, try again with -logg
-	AC_CHECK_LIB([FLAC], [FLAC__stream_decoder_init_file], [],
-		have_flac=no, -lm -logg)
-	], -lm)
-if test "$have_flac" = "yes"; then
-	AC_DEFINE(HAVE_FLAC, 1, define to 1 if you want to build the flacdec filter)
-	AC_SUBST(flac_cppflags)
-	flac_ldflags="$flac_libs -lFLAC"
-	AC_SUBST(flac_ldflags)
-else
-	AC_MSG_WARN([no flac support in para_audiod/para_filter/para_afh/para_server])
-fi
-CPPFLAGS="$OLD_CPPFLAGS"
-LDFLAGS="$OLD_LDFLAGS"
-LIBS="$OLD_LIBS"
+STASH_FLAGS
+LIB_ARG_WITH([id3tag], [-lid3tag -lz])
+HAVE_ID3TAG=yes
+AC_CHECK_HEADER(id3tag.h, [], HAVE_ID3TAG=no)
+AC_CHECK_LIB([id3tag], [id3_file_fdopen], [], HAVE_ID3TAG=no)
+LIB_SUBST_FLAGS(id3tag)
+UNSTASH_FLAGS
 ########################################################################### oss
-OLD_CPPFLAGS="$CPPFLAGS"
-OLD_LDFLAGS="$LDFLAGS"
-OLD_LIBS="$LIBS"
-
-have_oss="yes"
-msg="=> will not build oss writer"
-
-AC_CHECK_HEADER(sys/soundcard.h, [
-	AC_CHECK_LIB(ossaudio, _oss_ioctl, [
-			oss_ldflags="-lossaudio"
-			AC_SUBST(oss_ldflags)
-		]
-	)
-	],
+STASH_FLAGS
+LIB_ARG_WITH([oss], [])
+AC_CHECK_HEADER(sys/soundcard.h, [HAVE_OSS=yes], [HAVE_OSS=no])
+AC_CHECK_LIB(ossaudio, _oss_ioctl, [oss_ldflags="$oss_ldflags -lossaudio"], [])
+LIB_SUBST_FLAGS(oss)
+UNSTASH_FLAGS
+########################################################################### alsa
+STASH_FLAGS
+LIB_ARG_WITH([alsa], [-lasound])
+HAVE_ALSA=yes
+AC_CHECK_HEADER(alsa/asoundlib.h, [], HAVE_ALSA=no)
+AC_CHECK_LIB([asound], [snd_pcm_open], [], HAVE_ALSA=no)
+LIB_SUBST_FLAGS(alsa)
+UNSTASH_FLAGS
+######################################################################### pthread
+STASH_FLAGS
+LIB_ARG_WITH([pthread], [-lpthread])
+HAVE_PTHREAD=yes
+AC_CHECK_HEADER(pthread.h, [], HAVE_PTHREAD=no)
+AC_CHECK_LIB([pthread], [pthread_create], [], HAVE_PTHREAD=no)
+LIB_SUBST_FLAGS(pthread)
+UNSTASH_FLAGS
+########################################################################### libao
+STASH_FLAGS
+LIB_ARG_WITH([ao], [-lao])
+HAVE_AO=yes
+AC_CHECK_HEADER(ao/ao.h, [], HAVE_AO=no)
+AC_CHECK_LIB([ao], [ao_initialize], [], HAVE_AO=no)
+LIB_SUBST_FLAGS(ao)
+UNSTASH_FLAGS
+AC_DEFUN([NEED_AO_OBJECTS], [{ test $HAVE_AO = yes -a $HAVE_PTHREAD = yes; }])
+######################################################################## readline
+STASH_FLAGS
+AC_SEARCH_LIBS([tgetent], [tinfo curses terminfo termcap])
+LIB_ARG_WITH([readline], [-lreadline $LIBS])
+HAVE_READLINE=yes
+AC_CHECK_HEADER([readline/readline.h], [], [HAVE_READLINE=no])
+AC_CHECK_LIB([readline], [rl_free_keymap], [], HAVE_READLINE=no)
+AC_CHECK_DECL(
+	[rl_free_keymap],
+	[AC_DEFINE(RL_FREE_KEYMAP_DECLARED, 1, readline >= 6.3)],
+	[],
 	[
-		have_oss="no"
-		AC_MSG_WARN([no sys/soundcard.h $msg])
+		#include <stdio.h>
+		#include <readline/readline.h>
 	]
 )
-CPPFLAGS="$OLD_CPPFLAGS"
-LDFLAGS="$OLD_LDFLAGS"
-LIBS="$OLD_LIBS"
-
-########################################################################### alsa
-OLD_CPPFLAGS="$CPPFLAGS"
-OLD_LDFLAGS="$LDFLAGS"
-OLD_LIBS="$LIBS"
-
-msg="=> no alsa support for para_audiod/para_write"
-if test "$OSTYPE" != "Linux"; then
-	have_alsa="no"
-else
-	have_alsa="yes"
-fi
-if test "$have_alsa" = "yes"; then
-	AC_CHECK_HEADERS([alsa/asoundlib.h], [], [
-		have_alsa="no"
-		AC_MSG_WARN([no alsa/asoundlib $msg])
-	])
-fi
-
-if test "$have_alsa" = "yes"; then
-	AC_CHECK_LIB([asound], [snd_pcm_open], [], [
-		have_alsa="no"
-		AC_MSG_WARN([no libasound $msg])
-	])
-fi
-
-if test "$have_alsa" = "yes"; then
-	alsa_ldflags="-lasound"
-	AC_SUBST(alsa_ldflags)
-fi
-
-CPPFLAGS="$OLD_CPPFLAGS"
-LDFLAGS="$OLD_LDFLAGS"
-LIBS="$OLD_LIBS"
-########################################################################### libao
-OLD_CPPFLAGS="$CPPFLAGS"
-OLD_LDFLAGS="$LDFLAGS"
-OLD_LIBS="$LIBS"
-
-have_ao="yes"
-AC_ARG_WITH(ao_headers, [AS_HELP_STRING(--with-ao-headers=dir,
-	[look for ao/ao.h also in dir])])
-if test -n "$with_ao_headers"; then
-	ao_cppflags="-I$with_ao_headers"
-	CPPFLAGS="$CPPFLAGS $ao_cppflags"
-fi
-AC_ARG_WITH(ao_libs, [AS_HELP_STRING(--with-ao-libs=dir,
-	[look for libao also in dir])])
-if test -n "$with_ao_libs"; then
-	ao_libs="-L$with_ao_libs"
-	LDFLAGS="$LDFLAGS $ao_libs"
-fi
-msg="no libao support for para_audiod/para_write"
-AC_CHECK_HEADERS([ao/ao.h], [
-	], [
-	have_ao="no"
-	AC_MSG_WARN([ao.h not found, $msg])
-])
-if test "$have_ao" = "yes"; then
-	AC_CHECK_LIB([ao], [ao_initialize], [], [
-		have_ao="no"
-		AC_MSG_WARN([ao lib not found or not working, $msg])
-	])
-fi
-if test "$have_ao" = "yes"; then
-	AC_CHECK_HEADERS([pthread.h], [
-		], [
-		have_ao="no"
-		AC_MSG_WARN([pthread.h not found, $msg])
-	])
-fi
-if test "$have_ao" = "yes"; then
-	AC_CHECK_LIB([pthread], [pthread_create], [], [
-		have_ao="no"
-		AC_MSG_WARN([pthread lib not found or not working, $msg])
-	])
-fi
-if test "$have_ao" = "yes"; then
-	AC_SUBST(ao_cppflags)
-	ao_ldflags="$ao_libs -lao -lpthread"
-	AC_SUBST(ao_ldflags)
-fi
-
-CPPFLAGS="$OLD_CPPFLAGS"
-LDFLAGS="$OLD_LDFLAGS"
-LIBS="$OLD_LIBS"
-############################################################# readline
-OLD_CPPFLAGS="$CPPFLAGS"
-OLD_LDFLAGS="$LDFLAGS"
-OLD_LIBS="$LIBS"
-
-have_readline="yes"
-AC_ARG_WITH(readline_headers, [AS_HELP_STRING(--with-readline-headers=dir,
-	[look for libreadline header files also in dir])])
-if test -n "$with_readline_headers"; then
-	readline_cppflags="-I$with_readline_headers"
-	CPPFLAGS="$CPPFLAGS $readline_cppflags"
-fi
-
-AC_ARG_WITH(readline_libs, [AS_HELP_STRING(--with-readline-libs=dir,
-	[look for readline library also in dir])])
-if test -n "$with_readline_libs"; then
-	readline_libs="-L$with_readline_libs"
-	LDFLAGS="$LDFLAGS $readline_libs"
-fi
-msg="no interactive cli support"
-AC_CHECK_HEADERS([readline/readline.h], [
-	], [
-	have_readline="no"
-	AC_MSG_WARN([readline/readline.h not found, $msg])
-])
-
-if test "$have_readline" = "yes"; then
-	readline_ldflags="$readline_libs"
-	AC_SEARCH_LIBS([rl_free_keymap], [readline], [
-		readline_ldflags="$readline_ldflags -lreadline"
-	], [have_readline="no"])
-	if test "$have_readline" = "no"; then # try with -lcurses
-                # clear cache
-		AC_MSG_NOTICE([trying again with -lcurses])
-                unset ac_cv_search_rl_free_keymap 2> /dev/null
-		AC_SEARCH_LIBS([rl_free_keymap], [readline], [
-			have_readline=yes
-			readline_ldflags="$readline_ldflags -lreadline -lcurses"
-		], [], [-lcurses])
-	fi
-	if test "$have_readline" = "no"; then # try with -ltermcap
-                # clear cache
-		AC_MSG_NOTICE([trying again with -ltermcap])
-                unset ac_cv_search_rl_free_keymap 2> /dev/null
-		AC_SEARCH_LIBS([rl_free_keymap], [readline], [
-			have_readline=yes
-			readline_ldflags="$readline_ldflags -lreadline -ltermcap"
-		], [], [-ltermcap])
-	fi
-fi
-
-if test "$have_readline" = "yes"; then
-	AC_CHECK_DECL(
-		[rl_free_keymap],
-		[AC_DEFINE(RL_FREE_KEYMAP_DECLARED, 1, readline >= 6.3)],
-		[],
-		[
-			#include <stdio.h>
-			#include <readline/readline.h>
-		]
-	)
-	AC_SUBST(readline_cppflags)
-	AC_SUBST(readline_ldflags)
-	AC_DEFINE(HAVE_READLINE, 1, define to 1 to turn on readline support)
-else
-	AC_MSG_WARN([libreadline not found or unusable])
-fi
-CPPFLAGS="$OLD_CPPFLAGS"
-LDFLAGS="$OLD_LDFLAGS"
-LIBS="$OLD_LIBS"
+LIB_SUBST_FLAGS(readline)
+UNSTASH_FLAGS
 ############################################################# libsamplerate
-OLD_CPPFLAGS="$CPPFLAGS"
-OLD_LDFLAGS="$LDFLAGS"
-OLD_LIBS="$LIBS"
-
-have_samplerate="yes"
-AC_ARG_WITH(samplerate_headers, [AS_HELP_STRING(--with-samplerate-headers=dir,
-	[look for samplerate headers also in dir])])
-if test -n "$with_samplerate_headers"; then
-	samplerate_cppflags="-I$with_samplerate_headers"
-	CPPFLAGS="$CPPFLAGS $samplerate_cppflags"
-fi
-AC_ARG_WITH(samplerate_libs, [AS_HELP_STRING(--with-samplerate-libs=dir,
-	[look for samplerate libs also in dir])])
-if test -n "$with_samplerate_libs"; then
-	samplerate_libs="-L$with_samplerate_libs"
-	LDFLAGS="$LDFLAGS $samplerate_libs"
-fi
-
-AC_CHECK_HEADER(samplerate.h, [], have_samplerate=no)
-AC_CHECK_LIB([samplerate], [src_process], [], have_samplerate=no, [])
-
-if test "$have_samplerate" = "yes"; then
-	AC_SUBST(samplerate_cppflags)
-	samplerate_ldflags="$samplerate_libs -lsamplerate"
-	AC_SUBST(samplerate_ldflags)
-else
-	AC_MSG_WARN([no resample support in para_audiod/para_filter])
-fi
-CPPFLAGS="$OLD_CPPFLAGS"
-LDFLAGS="$OLD_LDFLAGS"
-LIBS="$OLD_LIBS"
+STASH_FLAGS
+LIB_ARG_WITH([samplerate], [-lsamplerate])
+HAVE_SAMPLERATE=yes
+AC_CHECK_HEADER(samplerate.h, [], HAVE_SAMPLERATE=no)
+AC_CHECK_LIB([samplerate], [src_process], [], HAVE_SAMPLERATE=no)
+LIB_SUBST_FLAGS(samplerate)
+UNSTASH_FLAGS
 ######################################################################### server
-if test \( "$have_openssl" = "yes" -o "$have_gcrypt" = "yes" \) \
-	-a "$have_osl" = "yes" ; then
-
+if test -n "$CRYPTOLIB" && test $HAVE_OSL = yes; then
 	build_server="yes"
 	executables="$executables server"
 	server_cmdline_objs="server"
@@ -825,32 +430,17 @@ if test \( "$have_openssl" = "yes" -o "$have_gcrypt" = "yes" \) \
 		version
 		ggo
 	"
-	if test "$have_openssl" = "yes"; then
+	if test "$CRYPTOLIB" = openssl; then
 		server_errlist_objs="$server_errlist_objs crypt"
-	fi
-	if test "$have_gcrypt" = "yes"; then
+	else
 		server_errlist_objs="$server_errlist_objs gcrypt"
 	fi
-	if test "$have_vorbis" = "yes" || \
-			test "$have_speex" = "yes" || \
-			test "$have_opus" = "yes"; then
-		server_errlist_objs="$server_errlist_objs ogg_afh_common"
-	fi
-	if test "$have_vorbis" = "yes"; then
-		server_errlist_objs="$server_errlist_objs ogg_afh"
-	fi
-	if test "$have_speex" = "yes"; then
-		server_errlist_objs="$server_errlist_objs spx_afh spx_common"
-	fi
-	if test "$have_opus" = "yes"; then
-		server_errlist_objs="$server_errlist_objs opus_afh opus_common"
-	fi
-	if test "$have_faad" = "yes"; then
-		server_errlist_objs="$server_errlist_objs aac_afh aac_common"
-	fi
-	if test "$have_flac" = "yes"; then
-		server_errlist_objs="$server_errlist_objs flac_afh"
-	fi
+	NEED_OGG_OBJECTS() && server_errlist_objs="$server_errlist_objs ogg_afh_common"
+	NEED_VORBIS_OBJECTS() && server_errlist_objs="$server_errlist_objs ogg_afh"
+	NEED_SPEEX_OBJECTS() && server_errlist_objs="$server_errlist_objs spx_afh spx_common"
+	NEED_OPUS_OBJECTS() && server_errlist_objs="$server_errlist_objs opus_afh opus_common"
+	NEED_FLAC_OBJECTS && server_errlist_objs="$server_errlist_objs flac_afh"
+	test $HAVE_FAAD = yes && server_errlist_objs="$server_errlist_objs aac_afh aac_common"
 	server_objs="add_cmdline($server_cmdline_objs) $server_errlist_objs"
 	AC_SUBST(server_objs, add_dot_o($server_objs))
 	AC_DEFINE_UNQUOTED(INIT_SERVER_ERRLISTS,
@@ -859,7 +449,7 @@ else
 	build_server="no"
 fi
 ############################################################# client
-if test "$have_openssl" = "yes" -o "$have_gcrypt" = "yes"; then
+if test -n "$CRYPTOLIB"; then
 	build_client="yes"
 	executables="$executables client"
 	client_cmdline_objs="client"
@@ -879,13 +469,12 @@ if test "$have_openssl" = "yes" -o "$have_gcrypt" = "yes"; then
 		version
 		ggo
 	"
-	if test "$have_openssl" = "yes"; then
+	if test "$CRYPTOLIB" = openssl; then
 		client_errlist_objs="$client_errlist_objs crypt"
-	fi
-	if test "$have_gcrypt" = "yes"; then
+	else
 		client_errlist_objs="$client_errlist_objs gcrypt"
 	fi
-	if test "$have_readline" = "yes"; then
+	if test $HAVE_READLINE = yes; then
 		client_errlist_objs="$client_errlist_objs interactive"
 	fi
 	client_objs="add_cmdline($client_cmdline_objs) $client_errlist_objs"
@@ -896,7 +485,7 @@ else
 	build_client="no"
 fi
 ############################################################# audiod
-if test "$have_openssl" = "yes" -o "$have_gcrypt" = "yes"; then
+if test -n "$CRYPTOLIB"; then
 	build_audiod="yes"
 	executables="$executables audiod"
 	audiod_audio_formats="wma"
@@ -950,54 +539,53 @@ if test "$have_openssl" = "yes" -o "$have_gcrypt" = "yes"; then
 		buffer_tree
 		sync_filter
 	"
-	if test "$have_openssl" = "yes"; then
+	if test "$CRYPTOLIB" = openssl; then
 		audiod_errlist_objs="$audiod_errlist_objs crypt"
-	fi
-	if test "$have_gcrypt" = "yes"; then
+	else
 		audiod_errlist_objs="$audiod_errlist_objs gcrypt"
 	fi
 	if test "$have_core_audio" = "yes"; then
 		audiod_errlist_objs="$audiod_errlist_objs osx_write ipc"
 		audiod_cmdline_objs="$audiod_cmdline_objs osx_write"
 	fi
-	if test "$have_vorbis" = "yes"; then
+	NEED_VORBIS_OBJECTS && {
 		audiod_errlist_objs="$audiod_errlist_objs oggdec_filter"
 		audiod_audio_formats="$audiod_audio_formats ogg"
-	fi
-	if test "$have_speex" = "yes"; then
+	}
+	NEED_SPEEX_OBJECTS && {
 		audiod_errlist_objs="$audiod_errlist_objs spxdec_filter spx_common"
 		audiod_audio_formats="$audiod_audio_formats spx"
-	fi
-	if test "$have_opus" = "yes"; then
+	}
+	NEED_OPUS_OBJECTS && {
 		audiod_errlist_objs="$audiod_errlist_objs opusdec_filter opus_common"
 		audiod_audio_formats="$audiod_audio_formats opus"
-	fi
-	if test "$have_faad" = "yes"; then
+	}
+	NEED_FLAC_OBJECTS && {
+		audiod_errlist_objs="$audiod_errlist_objs flacdec_filter"
+		audiod_audio_formats="$audiod_audio_formats flac"
+	}
+	if test $HAVE_FAAD = yes; then
 		audiod_errlist_objs="$audiod_errlist_objs aacdec_filter aac_common"
 		audiod_audio_formats="$audiod_audio_formats aac"
 	fi
-	if test "$have_mad" = "yes"; then
+	if test $HAVE_MAD = yes; then
 		audiod_audio_formats="$audiod_audio_formats mp3"
 		audiod_cmdline_objs="$audiod_cmdline_objs mp3dec_filter"
 		audiod_errlist_objs="$audiod_errlist_objs mp3dec_filter"
 	fi
-	if test "$have_flac" = "yes"; then
-		audiod_errlist_objs="$audiod_errlist_objs flacdec_filter"
-		audiod_audio_formats="$audiod_audio_formats flac"
-	fi
-	if test "$have_oss" = "yes"; then
+	if test $HAVE_OSS = yes; then
 		audiod_errlist_objs="$audiod_errlist_objs oss_write"
 		audiod_cmdline_objs="$audiod_cmdline_objs oss_write"
 	fi
-	if test "$have_alsa" = "yes"; then
+	if test $HAVE_ALSA = yes; then
 		audiod_errlist_objs="$audiod_errlist_objs alsa_write"
 		audiod_cmdline_objs="$audiod_cmdline_objs alsa_write"
 	fi
-	if test "$have_ao" = "yes"; then
+	NEED_AO_OBJECTS && {
 		audiod_errlist_objs="$audiod_errlist_objs ao_write"
 		audiod_cmdline_objs="$audiod_cmdline_objs ao_write"
-	fi
-	if test "$have_samplerate" = "yes"; then
+	}
+	if test $HAVE_SAMPLERATE = yes; then
 		audiod_errlist_objs="$audiod_errlist_objs resample_filter check_wav"
 		audiod_cmdline_objs="$audiod_cmdline_objs resample_filter"
 	fi
@@ -1015,17 +603,17 @@ else
 	build_audiod="no"
 fi
 ########################################################################### fade
-if test "$have_oss" = "yes" -o "$have_alsa" = "yes"; then
+if test $HAVE_OSS = yes -o $HAVE_ALSA = yes; then
 	build_fade="yes"
 	executables="$executables fade"
 	fade_cmdline_objs="fade"
 	fade_errlist_objs="fade exec string fd version ggo"
-	if test "$have_oss" = "yes"; then
+	if test $HAVE_OSS = yes; then
 		fade_errlist_objs="$fade_errlist_objs oss_mix"
 		mixers="${mixers}oss "
 		default_mixer="OSS_MIX"
 	fi
-	if test "$have_alsa" = "yes"; then
+	if test $HAVE_ALSA = yes; then
 		fade_errlist_objs="$fade_errlist_objs alsa_mix"
 		mixers="${mixers}alsa "
 		default_mixer="ALSA_MIX"
@@ -1060,7 +648,7 @@ else
 	AC_MSG_WARN([no mixer support])
 fi
 ########################################################################### gui
-if test "$have_curses" = "yes"; then
+if test $HAVE_CURSES = yes; then
 	build_gui="yes"
 	executables="$executables gui"
 	gui_cmdline_objs="gui"
@@ -1128,33 +716,32 @@ filter_cmdline_objs="
 	prebuffer_filter
 	sync_filter
 "
-
-if test "$have_vorbis" = "yes"; then
+NEED_VORBIS_OBJECTS && {
 	filters="$filters oggdec"
 	filter_errlist_objs="$filter_errlist_objs oggdec_filter"
-fi
-if test "$have_speex" = "yes"; then
+}
+NEED_SPEEX_OBJECTS && {
 	filters="$filters spxdec"
 	filter_errlist_objs="$filter_errlist_objs spxdec_filter spx_common"
-fi
-if test "$have_opus" = "yes"; then
+}
+NEED_OPUS_OBJECTS && {
 	filters="$filters opusdec"
 	filter_errlist_objs="$filter_errlist_objs opusdec_filter opus_common"
-fi
-if test "$have_faad" = "yes"; then
+}
+NEED_FLAC_OBJECTS && {
+	filter_errlist_objs="$filter_errlist_objs flacdec_filter"
+	filters="$filters flacdec"
+}
+if test $HAVE_FAAD = yes; then
 	filter_errlist_objs="$filter_errlist_objs aacdec_filter aac_common"
 	filters="$filters aacdec"
 fi
-if test "$have_mad" = "yes"; then
+if test $HAVE_MAD = yes; then
 	filter_cmdline_objs="$filter_cmdline_objs mp3dec_filter"
 	filter_errlist_objs="$filter_errlist_objs mp3dec_filter"
 	filters="$filters mp3dec"
 fi
-if test "$have_flac" = "yes"; then
-	filter_errlist_objs="$filter_errlist_objs flacdec_filter"
-	filters="$filters flacdec"
-fi
-if test "$have_samplerate" = "yes"; then
+if test $HAVE_SAMPLERATE = yes; then
 	filter_errlist_objs="$filter_errlist_objs resample_filter check_wav"
 	filter_cmdline_objs="$filter_cmdline_objs resample_filter"
 	filters="$filters resample"
@@ -1204,26 +791,15 @@ recv_errlist_objs="
 	mp3_afh
 	version
 "
-if test "$have_vorbis" = "yes" || \
-		test "$have_speex" = "yes" || \
-		test "$have_opus" = "yes"; then
-	recv_errlist_objs="$recv_errlist_objs ogg_afh_common"
-fi
-if test "$have_vorbis" = "yes"; then
-	recv_errlist_objs="$recv_errlist_objs ogg_afh"
-fi
-if test "$have_speex" = "yes"; then
-	recv_errlist_objs="$recv_errlist_objs spx_afh spx_common"
-fi
-if test "$have_opus" = "yes"; then
-	recv_errlist_objs="$recv_errlist_objs opus_afh opus_common"
-fi
-if test "$have_faad" = "yes"; then
+NEED_OGG_OBJECTS && recv_errlist_objs="$recv_errlist_objs ogg_afh_common"
+NEED_VORBIS_OBJECTS && recv_errlist_objs="$recv_errlist_objs ogg_afh"
+NEED_SPEEX_OBJECTS && recv_errlist_objs="$recv_errlist_objs spx_afh spx_common"
+NEED_OPUS_OBJECTS && recv_errlist_objs="$recv_errlist_objs opus_afh opus_common"
+NEED_FLAC_OBJECTS && recv_errlist_objs="$recv_errlist_objs flac_afh"
+
+if test $HAVE_FAAD = yes; then
 	recv_errlist_objs="$recv_errlist_objs aac_afh aac_common"
 fi
-if test "$have_flac" = "yes"; then
-	recv_errlist_objs="$recv_errlist_objs flac_afh"
-fi
 recv_objs="add_cmdline($recv_cmdline_objs) $recv_errlist_objs"
 AC_SUBST(receivers, "http dccp udp afh")
 AC_SUBST(recv_objs, add_dot_o($recv_objs))
@@ -1244,30 +820,26 @@ afh_errlist_objs="
 	version
 	ggo
 "
-if test "$have_vorbis" = "yes" || \
-		test "$have_speex" = "yes" || \
-		test "$have_opus" = "yes"; then
-	afh_errlist_objs="$afh_errlist_objs ogg_afh_common"
-fi
-if test "$have_vorbis" = "yes"; then
+NEED_OGG_OBJECTS && afh_errlist_objs="$afh_errlist_objs ogg_afh_common"
+NEED_VORBIS_OBJECTS && {
 	afh_errlist_objs="$afh_errlist_objs ogg_afh"
 	audio_format_handlers="$audio_format_handlers ogg"
-fi
-if test "$have_speex" = "yes"; then
+}
+NEED_SPEEX_OBJECTS && {
 	afh_errlist_objs="$afh_errlist_objs spx_afh spx_common"
 	audio_format_handlers="$audio_format_handlers spx"
-fi
-if test "$have_opus" = "yes"; then
+}
+NEED_OPUS_OBJECTS && {
 	afh_errlist_objs="$afh_errlist_objs opus_afh opus_common"
 	audio_format_handlers="$audio_format_handlers opus"
-fi
-if test "$have_faad" = "yes"; then
-	afh_errlist_objs="$afh_errlist_objs aac_common aac_afh"
-	audio_format_handlers="$audio_format_handlers aac"
-fi
-if test "$have_flac" = "yes"; then
+}
+NEED_FLAC_OBJECTS && {
 	afh_errlist_objs="$afh_errlist_objs flac_afh"
 	audio_format_handlers="$audio_format_handlers flac"
+}
+if test $HAVE_FAAD = yes; then
+	afh_errlist_objs="$afh_errlist_objs aac_common aac_afh"
+	audio_format_handlers="$audio_format_handlers aac"
 fi
 
 afh_objs="add_cmdline($afh_cmdline_objs) $afh_errlist_objs"
@@ -1325,46 +897,45 @@ if test "$have_core_audio" = "yes"; then
 	play_errlist_objs="$play_errlist_objs osx_write ipc"
 	play_cmdline_objs="$play_cmdline_objs osx_write"
 fi
-if test "$have_vorbis" = "yes" || \
-		test "$have_speex" = "yes" || \
-		test "$have_opus" = "yes"; then
-	play_errlist_objs="$play_errlist_objs ogg_afh_common"
-fi
-if test "$have_vorbis" = "yes"; then
+NEED_OGG_OBJECTS && play_errlist_objs="$play_errlist_objs ogg_afh_common"
+NEED_VORBIS_OBJECTS && {
 	play_errlist_objs="$play_errlist_objs oggdec_filter ogg_afh"
-fi
-if test "$have_speex" = "yes"; then
+}
+NEED_SPEEX_OBJECTS && {
 	play_errlist_objs="$play_errlist_objs spxdec_filter spx_afh spx_common"
-fi
-if test "$have_opus" = "yes"; then
-	play_errlist_objs="$play_errlist_objs opusdec_filter opus_afh opus_common"
-fi
-if test "$have_faad" = "yes"; then
+}
+NEED_OPUS_OBJECTS &&
+	play_errlist_objs="$play_errlist_objs
+		opusdec_filter
+		opus_afh
+		opus_common
+	"
+NEED_FLAC_OBJECTS && {
+	play_errlist_objs="$play_errlist_objs flacdec_filter flac_afh"
+}
+if test $HAVE_FAAD = yes; then
 	play_errlist_objs="$play_errlist_objs aacdec_filter aac_afh aac_common"
 fi
-if test "$have_mad" = "yes"; then
+if test $HAVE_MAD = yes; then
 	play_cmdline_objs="$play_cmdline_objs mp3dec_filter"
 	play_errlist_objs="$play_errlist_objs mp3dec_filter"
 fi
-if test "$have_flac" = "yes"; then
-	play_errlist_objs="$play_errlist_objs flacdec_filter flac_afh"
-fi
-if test "$have_oss" = "yes"; then
+if test $HAVE_OSS = yes; then
 	play_errlist_objs="$play_errlist_objs oss_write"
 	play_cmdline_objs="$play_cmdline_objs oss_write"
 fi
-if test "$have_alsa" = "yes"; then
+if test $HAVE_ALSA = yes; then
 	play_errlist_objs="$play_errlist_objs alsa_write"
 	play_cmdline_objs="$play_cmdline_objs alsa_write"
 fi
-if test "$have_ao" = "yes"; then
+NEED_AO_OBJECTS && {
 	play_errlist_objs="$play_errlist_objs ao_write"
 	play_cmdline_objs="$play_cmdline_objs ao_write"
-fi
-if test "$have_readline" = "yes"; then
+}
+if test $HAVE_READLINE = yes; then
 	play_errlist_objs="$play_errlist_objs interactive"
 fi
-if test "$have_samplerate" = "yes"; then
+if test $HAVE_SAMPLERATE = yes; then
 	play_errlist_objs="$play_errlist_objs resample_filter check_wav"
 	play_cmdline_objs="$play_cmdline_objs resample_filter"
 fi
@@ -1401,19 +972,19 @@ if test "$have_core_audio" = "yes"; then
 	writers="$writers osx"
 	default_writer="OSX_WRITE"
 fi
-if test "$have_ao" = "yes"; then
+NEED_AO_OBJECTS && {
 	write_errlist_objs="$write_errlist_objs ao_write"
 	write_cmdline_objs="$write_cmdline_objs ao_write"
 	writers="$writers ao"
 	default_writer="AO_WRITE"
-fi
-if test "$have_oss" = "yes"; then
+}
+if test $HAVE_OSS = yes; then
 	write_errlist_objs="$write_errlist_objs oss_write"
 	write_cmdline_objs="$write_cmdline_objs oss_write"
 	writers="$writers oss"
 	default_writer="OSS_WRITE"
 fi
-if test "$have_alsa" = "yes"; then
+if test $HAVE_ALSA = yes; then
 	write_errlist_objs="$write_errlist_objs alsa_write"
 	write_cmdline_objs="$write_cmdline_objs alsa_write"
 	writers="$writers alsa"
@@ -1444,7 +1015,7 @@ audioc_errlist_objs="
 	version
 	ggo
 "
-if test "$have_readline" = "yes"; then
+if test $HAVE_READLINE = yes; then
 	audioc_errlist_objs="$audioc_errlist_objs
 		buffer_tree
 		interactive
@@ -1533,10 +1104,11 @@ AC_OUTPUT
 AC_MSG_NOTICE([
 paraslash configuration:
 ~~~~~~~~~~~~~~~~~~~~~~~~
+crypto lib: ${CRYPTOLIB:-[none]}
 unix socket credentials: $have_ucred
-readline (interactive CLIs): $have_readline
+readline (interactive CLIs): $HAVE_READLINE
 audio formats handlers: $audio_format_handlers
-id3 version2 support: $have_libid3tag
+id3 version 2 support: $HAVE_ID3TAG
 filters: $filters
 writers: $writers
 
diff --git a/gcrypt.c b/gcrypt.c
index 62b95def..45a1c67d 100644
--- a/gcrypt.c
+++ b/gcrypt.c
@@ -87,7 +87,7 @@ void init_random_seed_or_die(void)
 }
 
 /** S-expression for the public part of an RSA key. */
-#define RSA_PUBKEY_SEXP  "(public-key (rsa (n %m) (e %m)))"
+#define RSA_PUBKEY_SEXP "(public-key (rsa (n %m) (e %m)))"
 /** S-expression for a private RSA key. */
 #define RSA_PRIVKEY_SEXP "(private-key (rsa (n %m) (e %m) (d %m) (p %m) (q %m) (u %m)))"
 
@@ -239,7 +239,6 @@ static int decode_key(const char *key_file, const char *header_str,
 		key[j++] = begin[i];
 	}
 	key[j] = '\0';
-	//PARA_CRIT_LOG("key: %s\n", key);
 	blob_size = key_size * 2;
 	blob = para_malloc(blob_size);
 	ret = base64_decode(key, blob, blob_size);
@@ -275,14 +274,14 @@ enum asn1_types {
 /* bit 6 has value 0 */
 static inline bool is_primitive(unsigned char c)
 {
-	return ((c & (1<<6)) == 0);
+	return (c & (1<<6)) == 0;
 }
 
 static inline bool is_primitive_integer(unsigned char c)
 {
 	if (!is_primitive(c))
 		return false;
-	return ((c & 0x1f) == ASN1_TYPE_INTEGER);
+	return (c & 0x1f) == ASN1_TYPE_INTEGER;
 }
 
 /* Bit 8 is zero (and bits 7-1 give the length) */
@@ -305,7 +304,7 @@ static int find_pubkey_bignum_offset(const unsigned char *data, int len)
 {
 	const unsigned char *p = data, *end = data + len;
 
-	/* the whole thing istarts with one sequence */
+	/* the whole thing starts with one sequence */
 	if (*p != ASN1_TYPE_SEQUENCE)
 		return -E_ASN1_PARSE;
 	p++;
@@ -429,7 +428,7 @@ static int find_privkey_bignum_offset(const unsigned char *data, int len)
 	if (p >= end)
 		return -E_ASN1_PARSE;
 
-	/* Skip next integer  */
+	/* skip next integer */
 	if (*p != ASN1_TYPE_INTEGER)
 		return -E_ASN1_PARSE;
 	p++;
@@ -583,6 +582,7 @@ static int get_asn_public_key(const char *key_file, struct asymmetric_key **resu
 	}
 	key = para_malloc(sizeof(*key));
 	key->sexp = sexp;
+	key->num_bytes = n_size;
 	*result = key;
 	ret = n_size;
 	PARA_INFO_LOG("successfully read %u bit asn public key\n", n_size * 8);
@@ -604,7 +604,7 @@ static int get_ssh_public_key(unsigned char *data, int size, gcry_sexp_t *result
 	size_t nr_scanned, erroff, decoded_size;
 	gcry_mpi_t e = NULL, n = NULL;
 
-	PARA_DEBUG_LOG("decoding %d byte  public rsa-ssh key\n", size);
+	PARA_DEBUG_LOG("decoding %d byte public rsa-ssh key\n", size);
 	if (size > INT_MAX / 4)
 		return -ERRNO_TO_PARA_ERROR(EOVERFLOW);
 	blob = para_malloc(2 * size);
diff --git a/mp3_afh.c b/mp3_afh.c
index 3b540c0b..ccd28dad 100644
--- a/mp3_afh.c
+++ b/mp3_afh.c
@@ -68,7 +68,7 @@ static const int mp3info_bitrate[2][3][14] = {
 static const int frame_size_index[] = {24000, 72000, 72000};
 static const char *mode_text[] = {"stereo", "joint stereo", "dual channel", "mono", "invalid"};
 
-#ifdef HAVE_LIBID3TAG
+#ifdef HAVE_ID3TAG
 
 #include <id3tag.h>
 
@@ -183,7 +183,7 @@ static int mp3_get_id3(unsigned char *map, size_t numbytes, __a_unused int fd,
 	return ret;
 }
 
-#else /* HAVE_LIBID3TAG */
+#else /* HAVE_ID3TAG */
 
 /*
  * Remove trailing whitespace from the end of a string
@@ -233,7 +233,7 @@ static int mp3_get_id3(unsigned char *map, size_t numbytes, __a_unused int fd,
 	tags->comment = para_strdup(comment);
 	return 1;
 }
-#endif /* HAVE_LIBID3TAG */
+#endif /* HAVE_ID3TAG */
 
 static int header_frequency(struct mp3header *h)
 {
diff --git a/server.h b/server.h
index 287614c8..93fd558c 100644
--- a/server.h
+++ b/server.h
@@ -10,12 +10,12 @@
 #define MMD_INFO_SIZE 16384
 
 /** The maximum length of the host component in an URL */
-#define MAX_HOSTLEN	256
+#define MAX_HOSTLEN 256
 
 
-/** Holds the arguments for the para_server's sender command. */
-struct sender_command_data{
-	/** Greater than 0 indicates that a sender cmd is already queued. */
+/** Arguments for the sender command. */
+struct sender_command_data {
+	/** Greater than zero indicates that a sender cmd is already queued. */
 	int cmd_num;
 	/** The number of the sender in question. */
 	int sender_num;
diff --git a/version.c b/version.c
index c9a329c3..69567561 100644
--- a/version.c
+++ b/version.c
@@ -43,7 +43,7 @@ const char *version_text(const char *pfx)
 	static char buf[512];
 
 	snprintf(buf, sizeof(buf) - 1, "%s\n"
-		"Copyright (C) 2014 Andre Noll\n"
+		"Copyright (C) 2002-2015 Andre Noll\n"
 		"This is free software with ABSOLUTELY NO WARRANTY."
 		" See COPYING for details.\n"
 		"Report bugs to <maan@tuebingen.mpg.de>.\n"