Add some more derived files to .gitignore.
[paraslash.git] / vss.c
diff --git a/vss.c b/vss.c
index f1dbfb9..d205349 100644 (file)
--- a/vss.c
+++ b/vss.c
 /*
- * 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"
+#include "ipc.h"
 #include "fd.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 "sched.h"
 
 extern struct misc_meta_data *mmd;
-extern struct audio_file_selector selectors[];
-extern struct sender senders[];
-static char *inbuf;
-static size_t *chunk_table, inbuf_size;
-
-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)
@@ -103,9 +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)
@@ -114,9 +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)
@@ -125,9 +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)
@@ -137,175 +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, &chunk_table);
-}
-
-/**
- * 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;
 
@@ -317,43 +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;
@@ -361,63 +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.
+ * Get the list of all supported audio formats.
  *
- */
-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
- *
- * \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.
  */
@@ -427,161 +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;
        }
-       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;
+       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);
+       }
+       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 ret;
+       return 1;
 }
 
-static char *vss_read_chunk(long unsigned current_chunk, ssize_t *len)
+static void recv_afs_result(struct vss_task *vsst)
 {
-       int ret;
-       size_t pos;
+       int ret, passed_fd, shmid;
+       uint32_t afs_code = 0, afs_data = 0;
+       struct stat statbuf;
 
-       *len = 0;
-       if (current_chunk >= mmd->chunks_total)
-               return NULL;
-       *len = chunk_table[current_chunk + 1] - chunk_table[current_chunk];
-       if (!*len) /* nothing to send for this run */
-               return inbuf;
-       pos = chunk_table[current_chunk];
-       if (inbuf_size < *len) {
-               PARA_INFO_LOG("increasing inbuf for chunk #%lu/%lu to %zd bytes\n",
-                       current_chunk, mmd->chunks_total, *len);
-               inbuf = para_realloc(inbuf, *len);
-               inbuf_size = *len;
+       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;
        }
-//     PARA_DEBUG_LOG("reading chunk #%lu@%zd (%zd bytes)\n", current_chunk,
-//             pos, *len);
-       ret = fseek(audio_file, pos, SEEK_SET);
+       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)
-               return NULL;
-       ret = para_fread(inbuf, *len, 1, audio_file);
-       if (ret != *len)
-               return NULL;
-       return inbuf;
+               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
- *
- * 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.
+ * Main sending function.
  *
- * 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 = vss_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);
+}