X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=vss.c;h=d205349370f69a9445ff1db7bb1c269b2d6431a7;hp=1983b8e5212fca40c99dd5c2963faee5c4e9d5fc;hb=f85e05c0b3951e7d3119983c118c82d71f2662a3;hpb=8b351937ccfe70a0837e77d691ebc240674fb6f8

diff --git a/vss.c b/vss.c
index 1983b8e5..d2053493 100644
--- a/vss.c
+++ b/vss.c
@@ -1,95 +1,96 @@
 /*
- * Copyright (C) 1997-2007 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 1997-2009 Andre Noll <maan@systemlinux.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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
+ * Licensed under the GPL v2. For licencing details see COPYING.
  */
 
-/** \file vss.c the virtual streaming system
+/** \file vss.c The virtual streaming system.
  *
- * This contains the audio sending part of para_server which is independent of
- * the current audio format, audio file selector and of the activated senders.
+ * This contains the audio streaming code of para_server which is independent
+ * of the current audio format, audio file selector and of the activated
+ * senders.
  */
 
+#include <dirent.h>
+
+#include "para.h"
+#include "error.h"
+#include "string.h"
+#include "afh.h"
+#include "afs.h"
 #include "server.h"
-#include <sys/time.h> /* gettimeofday */
+#include "net.h"
 #include "server.cmdline.h"
-#include "afs.h"
-#include "afh.h"
 #include "vss.h"
+#include "list.h"
 #include "send.h"
-#include "error.h"
-#include "string.h"
-
-extern const char *status_item_list[];
-
-static struct timeval announce_tv;
-static struct timeval data_send_barrier;
-static struct timeval eof_barrier;
-static struct timeval autoplay_barrier;
+#include "ipc.h"
+#include "fd.h"
+#include "sched.h"
 
 extern struct misc_meta_data *mmd;
-extern struct audio_file_selector selectors[];
-extern struct sender senders[];
-
-static FILE *audio_file = NULL;
 
-#if 1
-	void mp3_init(struct audio_format_handler *);
-#endif
+extern void dccp_send_init(struct sender *);
+extern void http_send_init(struct sender *);
+extern void udp_send_init(struct sender *);
 
-#ifdef HAVE_OGGVORBIS
-	void ogg_init(struct audio_format_handler *);
-#endif
-#ifdef HAVE_FAAD
-	void aac_afh_init(struct audio_format_handler *);
-#endif
-
-/**
- * the list of supported  audio formats
- */
-static struct audio_format_handler afl[] = {
-#if 1
+/** The list of supported senders. */
+struct sender senders[] = {
 	{
-		.name = "mp3",
-		.init = mp3_init,
+		.name = "http",
+		.init = http_send_init,
 	},
-#endif
-#ifdef HAVE_OGGVORBIS
 	{
-		.name = "ogg",
-		.init = ogg_init,
+		.name = "dccp",
+		.init = dccp_send_init,
 	},
-#endif
-#ifdef HAVE_FAAD
 	{
-		.name = "aac",
-		.init = aac_afh_init,
+		.name = "udp",
+		.init = udp_send_init,
 	},
-#endif
 	{
 		.name = NULL,
 	}
 };
 
-/** iterate over each supported audio format */
-#define FOR_EACH_AUDIO_FORMAT(i) for (i = 0; afl[i].name; i++)
+/** The possible states of the afs socket. */
+enum afs_socket_status {
+	/** Socket is inactive. */
+	AFS_SOCKET_READY,
+	/** Socket fd was included in the write fd set for select(). */
+	AFS_SOCKET_CHECK_FOR_WRITE,
+	/** vss wrote a request to the socket and waits for reply from afs. */
+	AFS_SOCKET_AFD_PENDING
+};
+
+/** The task structure for the virtual streaming system. */
+struct vss_task {
+	/** Copied from the -announce_time command line option. */
+	struct timeval announce_tv;
+	/** End of the announcing interval. */
+	struct timeval data_send_barrier;
+	/** End of the EOF interval. */
+	struct timeval eof_barrier;
+	/** Only used if --autoplay_delay was given. */
+	struct timeval autoplay_barrier;
+	/** Used for afs-server communication. */
+	int afs_socket;
+	/** The current state of \a afs_socket. */
+	enum afs_socket_status afsss;
+	/** The memory mapped audio file. */
+	char *map;
+	/** Used by the scheduler. */
+	struct task task;
+	/** Pointer to the header of the mapped audio file. */
+	const char *header_buf;
+	/** Length of the audio file header. */
+	size_t header_len;
+};
 
 /**
- * check if vss status flag \a P (playing) is set
+ * Check if vss status flag \a P (playing) is set.
  *
- * \return greater than zero if playing, zero otherwise.
+ * \return Greater than zero if playing, zero otherwise.
  *
  */
 unsigned int vss_playing(void)
@@ -98,9 +99,9 @@ unsigned int vss_playing(void)
 }
 
 /**
- * check if \a N (next) status flag is set
+ * Check if the \a N (next) status flag is set.
  *
- * \return greater than zero if set, zero if not.
+ * \return Greater than zero if set, zero if not.
  *
  */
 unsigned int vss_next(void)
@@ -109,9 +110,9 @@ unsigned int vss_next(void)
 }
 
 /**
- * check if a reposition request is pending
+ * Check if a reposition request is pending.
  *
- * \return greater than zero if true, zero otherwise.
+ * \return Greater than zero if true, zero otherwise.
  *
  */
 unsigned int vss_repos(void)
@@ -120,9 +121,9 @@ unsigned int vss_repos(void)
 }
 
 /**
- * check if the vss is currently paused
+ * Check if the vss is currently paused.
  *
- * \return greater than zero if paused, zero otherwise.
+ * \return Greater than zero if paused, zero otherwise.
  *
  */
 unsigned int vss_paused(void)
@@ -132,175 +133,19 @@ unsigned int vss_paused(void)
 }
 
 /**
- * get the name of the given audio format
- * \param i the audio format number
+ * Check if the vss is currently stopped.
  *
- * This returns a pointer to statically allocated memory so it
- * must not be freed by the caller.
- */
-const char *audio_format_name(int i)
-{
-	return i >= 0?  afl[i].name : "(none)";
-}
-
-/**
- * initialize the virtual streaming system
+ * \return Greater than zero if paused, zero otherwise.
  *
- * Call the init functions of all supported audio format handlers and
- * initialize all supported senders.
  */
-void vss_init(void)
+unsigned int vss_stopped(void)
 {
-	int i;
-	char *hn = para_hostname(), *home = para_homedir();
-
-	PARA_DEBUG_LOG("supported audio formats: %s\n",
-		SUPPORTED_AUDIO_FORMATS);
-	for (i = 0; afl[i].name; i++) {
-		PARA_NOTICE_LOG("initializing %s handler\n",
-			afl[i].name);
-		afl[i].init(&afl[i]);
-	}
-	ms2tv(conf.announce_time_arg, &announce_tv);
-	PARA_INFO_LOG("announce timeval: %lums\n", tv2ms(&announce_tv));
-	for (i = 0; senders[i].name; i++) {
-		PARA_NOTICE_LOG("initializing %s sender\n", senders[i].name);
-		senders[i].init(&senders[i]);
-	}
-	free(hn);
-	free(home);
-	if (conf.autoplay_given) {
-		struct timeval now, tmp;
-		mmd->vss_status_flags |= VSS_PLAYING;
-		mmd->new_vss_status_flags |= VSS_PLAYING;
-		gettimeofday(&now, NULL);
-		ms2tv(conf.autoplay_delay_arg, &tmp);
-		tv_add(&now, &tmp, &autoplay_barrier);
-	}
-}
-
-static int get_file_info(int i)
-{
-	return  afl[i].get_file_info(audio_file, mmd->audio_file_info,
-		&mmd->chunks_total, &mmd->seconds_total);
-}
-
-/**
- * guess the audio format judging from filename
- *
- * \param name the filename
- *
- * \return This function returns -1 if it has no idea what kind of audio
- * file this might be. Otherwise the (non-negative) number of the audio format
- * is returned.
- */
-int guess_audio_format(const char *name)
-{
-	int i,j, len = strlen(name);
-
-	FOR_EACH_AUDIO_FORMAT(i) {
-		for (j = 0; afl[i].suffixes[j]; j++) {
-			const char *p = afl[i].suffixes[j];
-			int plen = strlen(p);
-			if (len < plen + 1)
-				continue;
-			if (name[len - plen - 1] != '.')
-				continue;
-			if (strcasecmp(name + len - plen, p))
-				continue;
-//			PARA_DEBUG_LOG("might be %s\n", audio_format_name(i));
-			return i;
-		}
-	}
-	return -1;
-}
-
-static int get_audio_format(int omit)
-{
-	int i;
-
-	FOR_EACH_AUDIO_FORMAT(i) {
-		if (i == omit)
-			continue;
-		rewind(audio_file);
-		if (get_file_info(i) > 0)
-			return i;
-		rewind(audio_file);
-	}
-	return -E_AUDIO_FORMAT;
-}
-
-/*
- * upddate shared mem
- */
-static int update_mmd(void)
-{
-	int i;
-	struct stat file_status;
-
-	i = guess_audio_format(mmd->filename);
-	if (i < 0 || get_file_info(i) < 0)
-		i = get_audio_format(i);
-	if (i < 0)
-		return i;
-	mmd->audio_format = i;
-	mmd->chunks_sent = 0;
-	mmd->current_chunk = 0;
-	mmd->offset = 0;
-	if (fstat(fileno(audio_file), &file_status) == -1)
-		return -E_FSTAT;
-	mmd->size = file_status.st_size;
-	mmd->mtime = file_status.st_mtime;
-	mmd->events++;
-	PARA_NOTICE_LOG("next audio file: %s\n", mmd->filename);
-	return 1;
-}
-
-static void get_song(void)
-{
-	char **sl = selectors[mmd->selector_num].get_audio_file_list(10);
-	int i;
-
-	if (!sl)
-		goto err_out;
-	for (i = 0; sl[i]; i++) {
-		struct timeval now;
-		PARA_INFO_LOG("trying %s\n", sl[i]);
-		if (strlen(sl[i]) >= _POSIX_PATH_MAX)
-			continue;
-		audio_file = fopen(sl[i], "r");
-		if (!audio_file)
-			continue;
-		strcpy(mmd->filename, sl[i]);
-		if (update_mmd() < 0) {
-			fclose(audio_file);
-			audio_file = NULL;
-			continue;
-		}
-		mmd->num_played++;
-		if (selectors[mmd->selector_num].update_audio_file)
-			selectors[mmd->selector_num].update_audio_file(sl[i]);
-		PARA_DEBUG_LOG("%s", "success\n");
-		mmd->new_vss_status_flags &= (~VSS_NEXT);
-		gettimeofday(&now, NULL);
-		tv_add(&now, &announce_tv, &data_send_barrier);
-
-		goto free;
-	}
-	PARA_ERROR_LOG("%s", "no valid files found\n");
-err_out:
-	mmd->new_vss_status_flags = VSS_NEXT;
-free:
-	if (sl) {
-		for (i = 0; sl[i]; i++)
-			free(sl[i]);
-		free(sl);
-	}
+	return (mmd->new_vss_status_flags & VSS_NEXT)
+		&& !(mmd->new_vss_status_flags & VSS_PLAYING);
 }
 
-static int chk_barrier(const char *bname, const struct timeval *now,
-		const struct timeval *barrier, struct timeval *diff,
-		int print_log)
+static int chk_barrier(const char *bname, const struct timeval *barrier,
+		struct timeval *diff, int print_log)
 {
 	long ms;
 
@@ -312,43 +157,34 @@ static int chk_barrier(const char *bname, const struct timeval *now,
 	return -1;
 }
 
-static void vss_next_chunk_time(struct timeval *due)
-{
-	struct timeval tmp;
-
-	tv_scale(mmd->chunks_sent, &afl[mmd->audio_format].chunk_tv, &tmp);
-	tv_add(&tmp, &mmd->stream_start, due);
-}
-
 /*
  * != NULL: timeout for next chunk
  * NULL: nothing to do
  */
-static struct timeval *vss_compute_timeout(void)
+static struct timeval *vss_compute_timeout(struct vss_task *vsst)
 {
 	static struct timeval the_timeout;
-	struct timeval now, next_chunk;
+	struct timeval next_chunk;
 
-	if (vss_next() && mmd->audio_format >= 0) {
+	if (vss_next() && vsst->map) {
 		/* only sleep a bit, nec*/
 		the_timeout.tv_sec = 0;
 		the_timeout.tv_usec = 100;
 		return &the_timeout;
 	}
-	gettimeofday(&now, NULL);
-	if (chk_barrier("autoplay_delay", &now, &autoplay_barrier,
+	if (chk_barrier("autoplay_delay", &vsst->autoplay_barrier,
 			&the_timeout, 1) < 0)
 		return &the_timeout;
-	if (chk_barrier("eof", &now, &eof_barrier, &the_timeout, 1) < 0)
+	if (chk_barrier("eof", &vsst->eof_barrier, &the_timeout, 1) < 0)
 		return &the_timeout;
-	if (chk_barrier("data send", &now, &data_send_barrier,
+	if (chk_barrier("data send", &vsst->data_send_barrier,
 			&the_timeout, 1) < 0)
 		return &the_timeout;
-	if (mmd->audio_format < 0 || !vss_playing() || !audio_file)
+	if (!vss_playing() || !vsst->map)
 		return NULL;
-	vss_next_chunk_time(&next_chunk);
-	if (chk_barrier(afl[mmd->audio_format].name, &now, &next_chunk,
-			&the_timeout, 0) < 0)
+	compute_chunk_time(mmd->chunks_sent, &mmd->afd.afhi.chunk_tv,
+		&mmd->stream_start, &next_chunk);
+	if (chk_barrier("chunk", &next_chunk, &the_timeout, 0) < 0)
 		return &the_timeout;
 	/* chunk is due or bof */
 	the_timeout.tv_sec = 0;
@@ -356,63 +192,36 @@ static struct timeval *vss_compute_timeout(void)
 	return &the_timeout;
 }
 
-static void vss_eof(struct audio_format_handler *af)
+static void vss_eof(struct vss_task *vsst)
 {
-	struct timeval now;
-	int i;
-	char *tmp;
-
-	if (!af || !audio_file) {
-		for (i = 0; senders[i].name; i++)
-			senders[i].shutdown_clients();
+	mmd->stream_start = *now;
+	if (!vsst->map)
 		return;
-	}
-	gettimeofday(&now, NULL);
-	tv_add(&af->eof_tv, &now, &eof_barrier);
-	af->close_audio_file();
-	audio_file = NULL;
-	mmd->audio_format = -1;
-	af = NULL;
+	if (mmd->new_vss_status_flags & VSS_NOMORE)
+		mmd->new_vss_status_flags = VSS_NEXT;
+	tv_add(&mmd->afd.afhi.eof_tv, now, &vsst->eof_barrier);
+	para_munmap(vsst->map, mmd->size);
+	vsst->map = NULL;
 	mmd->chunks_sent = 0;
 	mmd->offset = 0;
-	mmd->seconds_total = 0;
-	tmp  = make_message("%s:\n%s:\n%s:\n", status_item_list[SI_AUDIO_INFO1],
-		status_item_list[SI_AUDIO_INFO2], status_item_list[SI_AUDIO_INFO3]);
-	strcpy(mmd->audio_file_info, tmp);
-	free(tmp);
-	tmp  = make_message("%s:\n%s:\n%s:\n", status_item_list[SI_DBINFO1],
-		status_item_list[SI_DBINFO2], status_item_list[SI_DBINFO3]);
-	strcpy(mmd->selector_info, tmp);
-	free(tmp);
-	mmd->filename[0] = '\0';
+	mmd->afd.afhi.seconds_total = 0;
+	mmd->afd.afhi.chunk_tv.tv_sec = 0;
+	mmd->afd.afhi.chunk_tv.tv_usec = 0;
+	free(mmd->afd.afhi.chunk_table);
+	mmd->afd.afhi.chunk_table = NULL;
+	free(mmd->afd.afhi.info_string);
+	mmd->afd.afhi.info_string = make_message("%s:\n%s:\n%s:\n", status_item_list[SI_AUDIO_FILE_INFO],
+		status_item_list[SI_TAGINFO1], status_item_list[SI_TAGINFO2]);
+	make_empty_status_items(mmd->afd.verbose_ls_output);
+	mmd->mtime = 0;
 	mmd->size = 0;
 	mmd->events++;
 }
 
 /**
- * get the header and of the current audio file
- *
- * \param header_len the length of the header is stored here
- *
- * \return a pointer to a buffer containing the header, or NULL, if no audio
- * file is selected or if the current audio format does not need special header
- * treamtment.
- *
- */
-char *vss_get_header(int *header_len)
-{
-	*header_len = 0;
-	if (mmd->audio_format < 0)
-		return NULL;
-	if (!afl[mmd->audio_format].get_header_info)
-		return NULL;
-	return afl[mmd->audio_format].get_header_info(header_len);
-}
-
-/**
- * get the list of all supported audio formats
+ * Get the list of all supported audio formats.
  *
- * \return a space separated list of all supported audio formats
+ * \return Aa space separated list of all supported audio formats
  * It is not allocated at runtime, i.e. there is no need to free
  * the returned string in the caller.
  */
@@ -422,133 +231,301 @@ const char *supported_audio_formats(void)
 }
 
 /**
- * get the chunk time of the current audio file
+ * Get the chunk time of the current audio file.
  *
- * \return a pointer to a struct containing the chunk time, or NULL,
+ * \return A pointer to a struct containing the chunk time, or NULL,
  * if currently no audio file is selected.
  */
 struct timeval *vss_chunk_time(void)
 {
-	if (mmd->audio_format < 0)
+	if (mmd->afd.afhi.chunk_tv.tv_sec == 0 &&
+			mmd->afd.afhi.chunk_tv.tv_usec == 0)
 		return NULL;
-	return &afl[mmd->audio_format].chunk_tv;
+	return &mmd->afd.afhi.chunk_tv;
+}
+
+static int need_to_request_new_audio_file(struct vss_task *vsst)
+{
+	struct timeval diff;
+
+	if (vsst->map) /* have audio file */
+		return 0;
+	if (!vss_playing()) /* don't need one */
+		return 0;
+	if (mmd->new_vss_status_flags & VSS_NOMORE)
+		return 0;
+	if (vsst->afsss == AFS_SOCKET_AFD_PENDING) /* already requested one */
+		return 0;
+	if (chk_barrier("autoplay_delay", &vsst->autoplay_barrier,
+			&diff, 1) < 0)
+		return 0;
+	return 1;
 }
 
 /**
- * compute the timeout for para_server's main select-loop
+ * Compute the timeout for para_server's main select-loop.
  *
  * This function gets called from para_server to determine the timeout value
  * for its main select loop.
  *
+ * \param s Pointer to the server scheduler.
+ * \param t Pointer to the vss task structure.
+ *
  * Before the timeout is computed, the current vss status flags are evaluated
  * and acted upon by calling appropriate functions from the lower layers.
  * Possible actions include
  *
- * 	- request a new file list from the current audio file selector
- *	- shutdown of all senders (stop/pause command)
- *	- reposition the stream (ff/jmp command)
- *
- * \return A pointer to a struct timeval containing the timeout for the next
- * chunk of data to be sent, or NULL if we're not sending right now.
+ * 	- request a new audio file from afs,
+ *	- shutdown of all senders (stop/pause command),
+ *	- reposition the stream (ff/jmp command).
  */
-struct timeval *vss_preselect(void)
+static void vss_pre_select(struct sched *s, struct task *t)
 {
-	struct audio_format_handler *af = NULL;
-	int i, format;
-	struct timeval *ret;
-again:
-	format = mmd->audio_format;
-	if (format >= 0)
-		af = afl + format;
-	else
-		for (i = 0; senders[i].name; i++)
-			senders[i].shutdown_clients();
-	if (vss_next() && af) {
-		vss_eof(af);
-		return vss_compute_timeout();
-	}
-	if (vss_paused() || vss_repos()) {
+	int i;
+	struct timeval *tv, diff;
+	struct vss_task *vsst = container_of(t, struct vss_task, task);
+
+	if (!vsst->map || vss_next() || vss_paused() || vss_repos())
 		for (i = 0; senders[i].name; i++)
 			senders[i].shutdown_clients();
-		if (af) {
-			struct timeval now;
-			gettimeofday(&now, NULL);
-			if (!vss_paused() || mmd->chunks_sent)
-				tv_add(&af->eof_tv, &now, &eof_barrier);
-			if (vss_repos())
-				tv_add(&now, &announce_tv, &data_send_barrier);
-			if (mmd->new_vss_status_flags & VSS_NOMORE)
-				mmd->new_vss_status_flags = VSS_NEXT;
-		}
+	if (vss_next())
+		vss_eof(vsst);
+	else if (vss_paused()) {
+		if (mmd->chunks_sent)
+			tv_add(&mmd->afd.afhi.eof_tv, now, &vsst->eof_barrier);
+		mmd->chunks_sent = 0;
+	} else if (vss_repos()) {
+		tv_add(now, &vsst->announce_tv, &vsst->data_send_barrier);
+		tv_add(&mmd->afd.afhi.eof_tv, now, &vsst->eof_barrier);
 		mmd->chunks_sent = 0;
-	}
-	if (vss_repos()) {
-		mmd->new_vss_status_flags &= ~(VSS_REPOS);
 		mmd->current_chunk = mmd->repos_request;
+		mmd->new_vss_status_flags &= ~VSS_REPOS;
+	}
+	if (need_to_request_new_audio_file(vsst)) {
+		PARA_DEBUG_LOG("ready and playing, but no audio file\n");
+		para_fd_set(vsst->afs_socket, &s->wfds, &s->max_fileno);
+		vsst->afsss = AFS_SOCKET_CHECK_FOR_WRITE;
+	} else
+		para_fd_set(vsst->afs_socket, &s->rfds, &s->max_fileno);
+	for (i = 0; senders[i].name; i++) {
+		if (!senders[i].pre_select)
+			continue;
+		senders[i].pre_select(&s->max_fileno, &s->rfds, &s->wfds);
 	}
-	ret = vss_compute_timeout();
-	if (!ret && !audio_file && vss_playing() &&
-			!(mmd->new_vss_status_flags & VSS_NOMORE)) {
-		PARA_DEBUG_LOG("%s", "ready and playing, but no audio file\n");
-		get_song();
-		goto again;
+	tv = vss_compute_timeout(vsst);
+	if (tv && tv_diff(tv, &s->timeout, &diff) < 0)
+		s->timeout = *tv;
+}
+
+static int recv_afs_msg(int afs_socket, int *fd, uint32_t *code, uint32_t *data)
+{
+	char control[255], buf[8];
+	struct msghdr msg = {.msg_iov = NULL};
+	struct cmsghdr *cmsg;
+	struct iovec iov;
+	int ret = 0;
+
+	*fd = -1;
+	iov.iov_base = buf;
+	iov.iov_len = sizeof(buf);
+	msg.msg_iov = &iov;
+	msg.msg_iovlen = 1;
+	msg.msg_control = control;
+	msg.msg_controllen = sizeof(control);
+	memset(buf, 0, sizeof(buf));
+	ret = recvmsg(afs_socket, &msg, 0);
+	if (ret < 0)
+		return -ERRNO_TO_PARA_ERROR(errno);
+	if (iov.iov_len != sizeof(buf))
+		return -E_AFS_SHORT_READ;
+	*code = *(uint32_t*)buf;
+	*data =  *(uint32_t*)(buf + 4);
+	for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
+		if (cmsg->cmsg_level != SOL_SOCKET
+			|| cmsg->cmsg_type != SCM_RIGHTS)
+		continue;
+		if ((cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int) != 1)
+		continue;
+		*fd = *(int *)CMSG_DATA(cmsg);
+	}
+	return 1;
+}
+
+static void recv_afs_result(struct vss_task *vsst)
+{
+	int ret, passed_fd, shmid;
+	uint32_t afs_code = 0, afs_data = 0;
+	struct stat statbuf;
+
+	vsst->afsss = AFS_SOCKET_READY;
+	mmd->afd.afhi.chunk_table = NULL;
+	ret = recv_afs_msg(vsst->afs_socket, &passed_fd, &afs_code, &afs_data);
+	if (ret < 0)
+		goto err;
+	PARA_DEBUG_LOG("fd: %d, code: %u, shmid: %u\n", passed_fd, afs_code,
+		afs_data);
+	ret = -E_NOFD;
+	if (afs_code != NEXT_AUDIO_FILE)
+		goto err;
+	if (passed_fd < 0)
+		goto err;
+	shmid = afs_data;
+	ret = load_afd(shmid, &mmd->afd);
+	if (ret < 0)
+		goto err;
+	shm_destroy(shmid);
+	ret = fstat(passed_fd, &statbuf);
+	if (ret < 0) {
+		PARA_ERROR_LOG("fstat error:\n");
+		ret = -ERRNO_TO_PARA_ERROR(errno);
+		goto err;
 	}
-	return ret;
+	mmd->size = statbuf.st_size;
+	mmd->mtime = statbuf.st_mtime;
+	ret = para_mmap(mmd->size, PROT_READ, MAP_PRIVATE, passed_fd,
+		0, &vsst->map);
+	if (ret < 0)
+		goto err;
+	close(passed_fd);
+	mmd->chunks_sent = 0;
+	mmd->current_chunk = 0;
+	mmd->offset = 0;
+	mmd->events++;
+	mmd->num_played++;
+	mmd->new_vss_status_flags &= (~VSS_NEXT);
+	afh_get_header(&mmd->afd.afhi, vsst->map, &vsst->header_buf,
+		&vsst->header_len);
+	return;
+err:
+	free(mmd->afd.afhi.chunk_table);
+	if (passed_fd >= 0)
+		close(passed_fd);
+	PARA_ERROR_LOG("%s\n", para_strerror(-ret));
+	mmd->new_vss_status_flags = VSS_NEXT;
 }
 
 /**
- * main sending function
+ * Main sending function.
  *
- * This function gets called from para_server as soon as the next chunk of
- * data should be pushed out. It first calls the read_chunk() function of
- * the current audio format handler to obtain a pointer to the data to be
- * sent out as well as its length. This information is then passed to each
- * supported sender's send() function which does the actual sending.
- *
- * Return value: Positive return value on success, zero on eof and negative
- * on errors.
+ * This function gets called from para_server as soon as the next chunk of data
+ * should be pushed out. It obtains a pointer to the data to be sent out as
+ * well as its length from mmd->afd.afhi. This information is then passed to
+ * each supported sender's send() function which is supposed to send out the data
+ * to all connected clients.
  */
-
-void vss_send_chunk(void)
+static void vss_send_chunk(struct vss_task *vsst)
 {
 	int i;
-	struct audio_format_handler *af;
-	char *buf;
-	ssize_t ret;
-	struct timeval now, due;
+	struct timeval due;
+	const char *buf;
+	size_t len;
 
-	if (mmd->audio_format < 0 || !audio_file || !vss_playing())
+	if (!vsst->map || !vss_playing())
 		return;
-	af = &afl[mmd->audio_format];
-	gettimeofday(&now, NULL);
-	vss_next_chunk_time(&due);
-	if (tv_diff(&due, &now, NULL) > 0)
+	compute_chunk_time(mmd->chunks_sent, &mmd->afd.afhi.chunk_tv,
+		&mmd->stream_start, &due);
+	if (tv_diff(&due, now, NULL) > 0)
 		return;
-	if (chk_barrier("eof", &now, &eof_barrier, &due, 1) < 0)
+	if (chk_barrier("eof", &vsst->eof_barrier, &due, 1) < 0)
 		return;
-	if (chk_barrier("data send", &now, &data_send_barrier,
+	if (chk_barrier("data send", &vsst->data_send_barrier,
 			&due, 1) < 0)
 		return;
-	buf = af->read_chunk(mmd->current_chunk, &ret);
-	mmd->new_vss_status_flags &= ~VSS_REPOS;
-	if (!buf) {
-		if (ret < 0)
-			mmd->new_vss_status_flags = VSS_NEXT;
-		else
-			mmd->new_vss_status_flags |= VSS_NEXT;
-		vss_eof(af);
+	if (mmd->current_chunk >= mmd->afd.afhi.chunks_total) { /* eof */
+		mmd->new_vss_status_flags |= VSS_NEXT;
 		return;
 	}
+	/*
+	 * We call the send function also in case of empty chunks as they
+	 * might have still some data queued which can be sent in this case.
+	 */
 	if (!mmd->chunks_sent) {
 		struct timeval tmp;
-		gettimeofday(&mmd->stream_start, NULL);
-		tv_scale(mmd->current_chunk, &af->chunk_tv, &tmp);
+		mmd->stream_start = *now;
+		tv_scale(mmd->current_chunk, &mmd->afd.afhi.chunk_tv, &tmp);
 		mmd->offset = tv2ms(&tmp);
 		mmd->events++;
 	}
+	afh_get_chunk(mmd->current_chunk, &mmd->afd.afhi, vsst->map, &buf, &len);
 	for (i = 0; senders[i].name; i++)
-		senders[i].send(mmd->current_chunk, mmd->chunks_sent, buf, ret);
+		senders[i].send(mmd->current_chunk, mmd->chunks_sent, buf, len,
+			vsst->header_buf, vsst->header_len);
 	mmd->new_vss_status_flags |= VSS_PLAYING;
 	mmd->chunks_sent++;
 	mmd->current_chunk++;
 }
+
+static void vss_post_select(struct sched *s, struct task *t)
+{
+	int ret, i;
+	struct vss_task *vsst = container_of(t, struct vss_task, task);
+
+	if (mmd->sender_cmd_data.cmd_num >= 0) {
+		int num = mmd->sender_cmd_data.cmd_num,
+			sender_num = mmd->sender_cmd_data.sender_num;
+
+		if (senders[sender_num].client_cmds[num])
+			senders[sender_num].client_cmds[num](&mmd->sender_cmd_data);
+		mmd->sender_cmd_data.cmd_num = -1;
+	}
+	if (vsst->afsss != AFS_SOCKET_CHECK_FOR_WRITE) {
+		if (FD_ISSET(vsst->afs_socket, &s->rfds))
+			recv_afs_result(vsst);
+	} else if (FD_ISSET(vsst->afs_socket, &s->wfds)) {
+		PARA_NOTICE_LOG("requesting new fd from afs\n");
+		ret = send_buffer(vsst->afs_socket, "new");
+		vsst->afsss = AFS_SOCKET_AFD_PENDING;
+	}
+	for (i = 0; senders[i].name; i++) {
+		if (!senders[i].post_select)
+			continue;
+		senders[i].post_select(&s->rfds, &s->wfds);
+	}
+	if ((vss_playing() && !(mmd->vss_status_flags & VSS_PLAYING)) ||
+			(vss_next() && vss_playing()))
+		tv_add(now, &vsst->announce_tv, &vsst->data_send_barrier);
+	vss_send_chunk(vsst);
+}
+
+/**
+ * Initialize the virtual streaming system task.
+ *
+ * \param afs_socket The fd for communication with afs.
+ *
+ * This also initializes all supported senders and starts streaming
+ * if the --autoplay command line flag was given.
+ */
+void init_vss_task(int afs_socket)
+{
+	static struct vss_task vss_task_struct, *vsst = &vss_task_struct;
+	int i;
+	char *hn = para_hostname(), *home = para_homedir();
+	long unsigned announce_time = conf.announce_time_arg > 0?
+			conf.announce_time_arg : 300,
+		autoplay_delay = conf.autoplay_delay_arg > 0?
+			conf.autoplay_delay_arg : 0;
+
+	vsst->afs_socket = afs_socket;
+	vsst->task.pre_select = vss_pre_select;
+	vsst->task.post_select = vss_post_select;
+	ms2tv(announce_time, &vsst->announce_tv);
+	PARA_INFO_LOG("announce timeval: %lums\n", tv2ms(&vsst->announce_tv));
+	for (i = 0; senders[i].name; i++) {
+		PARA_NOTICE_LOG("initializing %s sender\n", senders[i].name);
+		senders[i].init(&senders[i]);
+	}
+	free(hn);
+	free(home);
+	mmd->sender_cmd_data.cmd_num = -1;
+	make_empty_status_items(mmd->afd.verbose_ls_output);
+	if (conf.autoplay_given) {
+		struct timeval tmp;
+		mmd->vss_status_flags |= VSS_PLAYING;
+		mmd->new_vss_status_flags |= VSS_PLAYING;
+		ms2tv(autoplay_delay, &tmp);
+		tv_add(now, &tmp, &vsst->autoplay_barrier);
+		tv_add(&vsst->autoplay_barrier, &vsst->announce_tv,
+			&vsst->data_send_barrier);
+	}
+	register_task(&vsst->task);
+}