/*
- * 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 <regex.h>
+#include <dirent.h>
+#include <osl.h>
+
+#include "para.h"
+#include "error.h"
+#include "portable_io.h"
+#include "fec.h"
+#include "string.h"
+#include "afh.h"
+#include "afs.h"
#include "server.h"
-#include <sys/mman.h> /* mmap */
-#include <sys/time.h> /* gettimeofday */
+#include "net.h"
#include "server.cmdline.h"
-#include "afs.h"
+#include "list.h"
#include "vss.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 FILE *audio_file = NULL;
-static char *map;
-#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;
+ /** Time between audio file headers are sent. */
+ struct timeval header_interval;
+};
+/**
+ * The list of currently connected fec clients.
+ *
+ * Senders may use \ref vss_add_fec_client() to add entries to the list.
+ */
+static struct list_head fec_client_list;
/**
- * check if vss status flag \a P (playing) is set
+ * Data associated with one FEC group.
*
- * \return greater than zero if playing, zero otherwise.
+ * A FEC group consists of a fixed number of slices and this number is given by
+ * the \a slices_per_group parameter of struct \ref fec_client_parms. Each FEC
+ * group contains a number of chunks of the current audio file.
*
+ * FEC slices directly correspond to the data packages sent by the paraslash
+ * senders that use FEC. Each slice is identified by its group number and its
+ * number within the group. All slices have the same size, but the last slice
+ * of the group may not be filled entirely.
*/
-unsigned int vss_playing(void)
+struct fec_group {
+ /** The number of the FEC group. */
+ uint32_t num;
+ /** Number of bytes in this group. */
+ uint32_t bytes;
+ /** The first chunk of the current audio file belonging to the group. */
+ uint32_t first_chunk;
+ /** The number of chunks contained in this group. */
+ uint32_t num_chunks;
+ /** When the first chunk was sent. */
+ struct timeval start;
+ /** The duration of the full group. */
+ struct timeval duration;
+ /** The group duration divided by the number of slices. */
+ struct timeval slice_duration;
+ /** Group contains the audio file header that occupies that many slices. */
+ uint8_t num_header_slices;
+};
+
+/**
+ * Describes one connected FEC client.
+ */
+struct fec_client {
+ /** If negative, this client is temporarily disabled. */
+ int error;
+ /** Parameters requested by the client. */
+ struct fec_client_parms *fcp;
+ /** Used by the core FEC code. */
+ struct fec_parms *parms;
+ /** The position of this client in the fec client list. */
+ struct list_head node;
+ /** When the first slice for this client was sent. */
+ struct timeval stream_start;
+ /** The first chunk sent to this FEC client. */
+ int first_stream_chunk;
+ /** Describes the current group. */
+ struct fec_group group;
+ /** The current slice. */
+ uint8_t current_slice_num;
+ /** The data to be FEC-encoded (point to a region within the mapped audio file). */
+ const unsigned char **src_data;
+ /** Last time an audio header was sent. */
+ struct timeval next_header_time;
+ /** Used for the last source pointer of an audio file. */
+ unsigned char *extra_src_buf;
+ /** Extra slices needed to store largest chunk + header. */
+ int num_extra_slices;
+ /** Contains the FEC-encoded data. */
+ unsigned char *enc_buf;
+};
+
+/**
+ * Get the chunk time of the current audio file.
+ *
+ * \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)
{
- return mmd->new_vss_status_flags & VSS_PLAYING;
+ if (mmd->afd.afhi.chunk_tv.tv_sec == 0 &&
+ mmd->afd.afhi.chunk_tv.tv_usec == 0)
+ return NULL;
+ return &mmd->afd.afhi.chunk_tv;
}
/**
- * check if \a N (next) status flag is set
- *
- * \return greater than zero if set, zero if not.
+ * Write a fec header to a buffer.
*
+ * \param buf The buffer to write to.
+ * \param h The fec header to write.
*/
-unsigned int vss_next(void)
+static void write_fec_header(struct fec_client *fc, struct vss_task *vsst)
{
- return mmd->new_vss_status_flags & VSS_NEXT;
+ char *buf = (char *)fc->enc_buf;
+ struct fec_group *g = &fc->group;
+ struct fec_client_parms *p = fc->fcp;
+
+ write_u32(buf, FEC_MAGIC);
+
+ write_u8(buf + 4, p->slices_per_group + fc->num_extra_slices);
+ write_u8(buf + 5, p->data_slices_per_group + fc->num_extra_slices);
+ write_u32(buf + 6, g->num_header_slices? vsst->header_len : 0);
+
+ write_u32(buf + 10, g->num);
+ write_u32(buf + 14, g->bytes);
+
+ write_u8(buf + 18, fc->current_slice_num);
+ write_u16(buf + 20, p->max_slice_bytes - FEC_HEADER_SIZE);
+ write_u8(buf + 22, g->first_chunk? 0 : 1);
+ write_u8(buf + 23, vsst->header_len? 1 : 0);
+ memset(buf + 24, 0, 7);
+}
+
+static int need_audio_header(struct fec_client *fc, struct vss_task *vsst)
+{
+ if (!mmd->current_chunk) {
+ tv_add(now, &vsst->header_interval, &fc->next_header_time);
+ return 0;
+ }
+ if (!vsst->header_buf)
+ return 0;
+ if (!vsst->header_len)
+ return 0;
+ if (fc->group.num && tv_diff(&fc->next_header_time, now, NULL) > 0)
+ return 0;
+ tv_add(now, &vsst->header_interval, &fc->next_header_time);
+ return 1;
+}
+
+static int num_slices(long unsigned bytes, struct fec_client *fc, uint8_t *result)
+{
+ unsigned long m = fc->fcp->max_slice_bytes - FEC_HEADER_SIZE;
+ unsigned rv, redundant_slices = fc->fcp->slices_per_group
+ - fc->fcp->data_slices_per_group;
+
+ if (!m)
+ return -E_BAD_CT;
+ rv = (bytes + m - 1) / m;
+ if (rv + redundant_slices > 255)
+ return -E_BAD_CT;
+ *result = rv;
+ return 1;
+}
+
+/* set group start and group duration */
+static void set_group_timing(struct fec_client *fc, struct fec_group *g)
+{
+ struct timeval *chunk_tv = vss_chunk_time();
+
+ tv_scale(g->num_chunks, chunk_tv, &g->duration);
+ tv_divide(fc->fcp->slices_per_group + fc->num_extra_slices,
+ &g->duration, &g->slice_duration);
+ PARA_DEBUG_LOG("durations (group/chunk/slice): %lu/%lu/%lu\n",
+ tv2ms(&g->duration), tv2ms(chunk_tv), tv2ms(&g->slice_duration));
+}
+
+static int setup_next_fec_group(struct fec_client *fc, struct vss_task *vsst)
+{
+ int ret, i, k, data_slices;
+ size_t len;
+ const char *buf, *start_buf;
+ struct fec_group *g = &fc->group;
+ unsigned slice_bytes = fc->fcp->max_slice_bytes - FEC_HEADER_SIZE;
+ uint32_t max_data_size;
+
+ if (fc->first_stream_chunk < 0) {
+ uint8_t hs, ds; /* needed header/data slices */
+ uint8_t rs = fc->fcp->slices_per_group
+ - fc->fcp->data_slices_per_group; /* redundant slices */
+ int n;
+
+ ret = num_slices(vsst->header_len, fc, &hs);
+ if (ret < 0)
+ return ret;
+ ret = num_slices(afh_get_largest_chunk_size(&mmd->afd.afhi),
+ fc, &ds);
+ if (ret < 0)
+ return ret;
+ k = (int)hs + ds;
+ if (k > 255)
+ return -E_BAD_CT;
+ if (k < fc->fcp->data_slices_per_group)
+ k = fc->fcp->data_slices_per_group;
+ n = k + rs;
+ fc->num_extra_slices = k - fc->fcp->data_slices_per_group;
+ PARA_NOTICE_LOG("fec parms %d:%d:%d (%d extra slices)\n",
+ slice_bytes, k, n, fc->num_extra_slices);
+ fec_free(fc->parms);
+ fc->src_data = para_realloc(fc->src_data, k * sizeof(char *));
+ ret = fec_new(k, n, &fc->parms);
+ if (ret < 0)
+ return ret;
+ fc->stream_start = *now;
+ fc->first_stream_chunk = mmd->current_chunk;
+ g->first_chunk = mmd->current_chunk;
+ g->num = 0;
+ g->start = *now;
+ } else {
+ /*
+ * Start and duration of this group depend only on the previous
+ * group. Compute the new group start as g->start += g->duration.
+ */
+ struct timeval tmp = g->start;
+ tv_add(&tmp, &g->duration, &g->start);
+ k = fc->fcp->data_slices_per_group + fc->num_extra_slices;
+ set_group_timing(fc, g);
+ g->first_chunk += g->num_chunks;
+ g->num++;
+ }
+ if (g->first_chunk >= mmd->afd.afhi.chunks_total)
+ return 0;
+ if (need_audio_header(fc, vsst)) {
+ ret = num_slices(vsst->header_len, fc, &g->num_header_slices);
+ if (ret < 0)
+ return ret;
+ } else
+ g->num_header_slices = 0;
+ afh_get_chunk(g->first_chunk, &mmd->afd.afhi, vsst->map, &start_buf,
+ &len);
+ data_slices = k - g->num_header_slices;
+ assert(data_slices);
+ max_data_size = slice_bytes * data_slices;
+ g->bytes = 0;
+ for (i = g->first_chunk; i < mmd->afd.afhi.chunks_total; i++) {
+ afh_get_chunk(i, &mmd->afd.afhi, vsst->map, &buf, &len);
+ if (g->bytes + len > max_data_size)
+ break;
+ g->bytes += len;
+ }
+ g->num_chunks = i - g->first_chunk;
+ assert(g->num_chunks);
+ fc->current_slice_num = 0;
+ if (g->num == 0)
+ set_group_timing(fc, g);
+
+ /* setup header slices */
+ buf = vsst->header_buf;
+ for (i = 0; i < g->num_header_slices; i++) {
+ fc->src_data[i] = (const unsigned char *)buf;
+ buf += slice_bytes;
+ }
+
+ /* setup data slices */
+ buf = start_buf;
+ for (i = g->num_header_slices; i < k; i++) {
+ if (buf + slice_bytes > vsst->map + mmd->size)
+ /*
+ * Can not use the memory mapped audio file for this
+ * slice as it goes beyond the map. This slice will not
+ * be fully used.
+ */
+ break;
+ fc->src_data[i] = (const unsigned char *)buf;
+ buf += slice_bytes;
+ }
+ if (i < k) {
+ uint32_t payload_size = vsst->map + mmd->size - buf;
+ memcpy(fc->extra_src_buf, buf, payload_size);
+ fc->src_data[i] = fc->extra_src_buf;
+ i++;
+ /* use arbitrary data for all remaining slices */
+ buf = vsst->map;
+ for (; i < k; i++)
+ fc->src_data[i] = (const unsigned char *)buf;
+ }
+ PARA_DEBUG_LOG("FEC group %d: %d chunks (%d - %d), "
+ "%d header slices, %d data slices\n",
+ g->num, g->num_chunks, g->first_chunk,
+ g->first_chunk + g->num_chunks - 1,
+ g->num_header_slices, data_slices
+ );
+ return 1;
+}
+
+static int compute_next_fec_slice(struct fec_client *fc, struct vss_task *vsst)
+{
+ assert(fc->error >= 0);
+ if (fc->first_stream_chunk < 0 || fc->current_slice_num
+ == fc->fcp->slices_per_group + fc->num_extra_slices) {
+ int ret = setup_next_fec_group(fc, vsst);
+ if (ret == 0)
+ return 0;
+ if (ret < 0) {
+ PARA_ERROR_LOG("%s\n", para_strerror(-ret));
+ PARA_ERROR_LOG("FEC client temporarily disabled\n");
+ fc->error = ret;
+ return fc->error;
+ }
+ }
+ write_fec_header(fc, vsst);
+ fec_encode(fc->parms, fc->src_data, fc->enc_buf + FEC_HEADER_SIZE,
+ fc->current_slice_num,
+ fc->fcp->max_slice_bytes - FEC_HEADER_SIZE);
+ return 1;
}
/**
- * check if a reposition request is pending
+ * Return a buffer that marks the end of the stream.
*
- * \return greater than zero if true, zero otherwise.
+ * \param buf Result pointer.
+ * \return The length of the eof buffer.
*
+ * This is used for (multicast) udp streaming where closing the socket on the
+ * sender might not give rise to an eof condition at the peer.
*/
-unsigned int vss_repos(void)
+size_t vss_get_fec_eof_packet(const char **buf)
{
- return mmd->new_vss_status_flags & VSS_REPOS;
+ static const char fec_eof_packet[FEC_HEADER_SIZE] = FEC_EOF_PACKET;
+ *buf = fec_eof_packet;
+ return FEC_HEADER_SIZE;
}
/**
- * check if the vss is currently paused
+ * Add one entry to the list of active fec clients.
*
- * \return greater than zero if paused, zero otherwise.
+ * \param fcp Describes the fec parameters to be used for this client.
+ * \param result An opaque pointer that must be used by remove the client later.
*
+ * \return Standard.
*/
-unsigned int vss_paused(void)
+int vss_add_fec_client(struct fec_client_parms *fcp, struct fec_client **result)
{
- return !(mmd->new_vss_status_flags & VSS_NEXT)
- && !(mmd->new_vss_status_flags & VSS_PLAYING);
+ int ret;
+ struct fec_client *fc;
+
+ if (fcp->max_slice_bytes < FEC_HEADER_SIZE + fcp->data_slices_per_group)
+ return -ERRNO_TO_PARA_ERROR(EINVAL);
+ fc = para_calloc(sizeof(*fc));
+ fc->fcp = fcp;
+ ret = fec_new(fcp->data_slices_per_group, fcp->slices_per_group,
+ &fc->parms);
+ if (ret < 0)
+ goto err;
+ fc->first_stream_chunk = -1; /* stream not yet started */
+ fc->src_data = para_malloc(fc->fcp->slices_per_group * sizeof(char *));
+ fc->enc_buf = para_calloc(fc->fcp->max_slice_bytes);
+ fc->num_extra_slices = 0;
+ fc->extra_src_buf = para_calloc(fc->fcp->max_slice_bytes);
+ fc->next_header_time.tv_sec = 0;
+ para_list_add(&fc->node, &fec_client_list);
+ *result = fc;
+ return 1;
+err:
+ fec_free(fc->parms);
+ free(fc);
+ *result = NULL;
+ return ret;
}
/**
- * get the name of the given audio format
- * \param i the audio format number
+ * Remove one entry from the list of active fec clients.
*
- * This returns a pointer to statically allocated memory so it
- * must not be freed by the caller.
+ * \param fc The client to be removed.
*/
-const char *audio_format_name(int i)
+void vss_del_fec_client(struct fec_client *fc)
{
- return i >= 0? afl[i].name : "(none)";
+ list_del(&fc->node);
+ free(fc->src_data);
+ free(fc->enc_buf);
+ free(fc->extra_src_buf);
+ fec_free(fc->parms);
+ free(fc);
}
-/**
- * initialize the virtual streaming system
+/*
+ * Compute if/when next slice is due. If it isn't due yet and \a diff is
+ * not \p Null, compute the time difference next - now, where
*
- * Call the init functions of all supported audio format handlers and
- * initialize all supported senders.
+ * next = stream_start + (first_group_chunk - first_stream_chunk)
+ * * chunk_time + slice_num * slice_time
*/
-void vss_init(void)
+static int next_slice_is_due(struct fec_client *fc, struct timeval *diff)
{
- int i;
- char *hn = para_hostname(), *home = para_homedir();
+ struct timeval tmp, next;
+ int ret;
- 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);
+ if (fc->first_stream_chunk < 0)
+ return 1;
+ tv_scale(fc->current_slice_num, &fc->group.slice_duration, &tmp);
+ tv_add(&tmp, &fc->group.start, &next);
+ ret = tv_diff(&next, now, diff);
+ return ret < 0? 1 : 0;
+}
+
+static void compute_slice_timeout(struct timeval *timeout)
+{
+ struct fec_client *fc;
+
+ assert(vss_playing());
+ list_for_each_entry(fc, &fec_client_list, node) {
+ struct timeval diff;
+
+ if (fc->error < 0)
+ continue;
+ if (next_slice_is_due(fc, &diff)) {
+ timeout->tv_sec = 0;
+ timeout->tv_usec = 0;
+ return;
+ }
+ /* timeout = min(timeout, diff) */
+ if (tv_diff(&diff, timeout, NULL) < 0)
+ *timeout = diff;
}
}
-static int get_file_info(int i)
+static void set_eof_barrier(struct vss_task *vsst)
{
- return afl[i].get_file_info(map, mmd->size, &mmd->afi);
+ struct fec_client *fc;
+ struct timeval timeout = {1, 0}, *chunk_tv = vss_chunk_time();
+
+ if (!chunk_tv)
+ goto out;
+ list_for_each_entry(fc, &fec_client_list, node) {
+ struct timeval group_duration;
+
+ if (fc->error < 0)
+ continue;
+ tv_scale(fc->group.num_chunks, chunk_tv, &group_duration);
+ if (tv_diff(&timeout, &group_duration, NULL) < 0)
+ timeout = group_duration;
+ }
+out:
+ tv_add(now, &timeout, &vsst->eof_barrier);
}
/**
- * guess the audio format judging from filename
+ * Check if vss status flag \a P (playing) is set.
*
- * \param name the filename
+ * \return Greater than zero if playing, zero otherwise.
*
- * \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)
+unsigned int vss_playing(void)
{
- 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;
+ return mmd->new_vss_status_flags & VSS_PLAYING;
}
-static int get_audio_format(int omit)
+/**
+ * Check if the \a N (next) status flag is set.
+ *
+ * \return Greater than zero if set, zero if not.
+ *
+ */
+unsigned int vss_next(void)
{
- 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;
+ return mmd->new_vss_status_flags & VSS_NEXT;
}
-/*
- * upddate shared mem
+/**
+ * Check if a reposition request is pending.
+ *
+ * \return Greater than zero if true, zero otherwise.
+ *
*/
-static int update_mmd(void)
+unsigned int vss_repos(void)
{
- int i, fd = fileno(audio_file);
- struct stat file_status;
-
- if (fstat(fd, &file_status) == -1)
- return -E_FSTAT;
- mmd->size = file_status.st_size;
- mmd->mtime = file_status.st_mtime;
- map = para_mmap(file_status.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
- 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;
- mmd->events++;
- PARA_NOTICE_LOG("next audio file: %s\n", mmd->filename);
- return 1;
+ return mmd->new_vss_status_flags & VSS_REPOS;
}
-static void vss_get_audio_file(void)
+/**
+ * Check if the vss is currently paused.
+ *
+ * \return Greater than zero if paused, zero otherwise.
+ *
+ */
+unsigned int vss_paused(void)
{
- char **sl = selectors[mmd->selector_num].get_audio_file_list(10);
- int i;
+ return !(mmd->new_vss_status_flags & VSS_NEXT)
+ && !(mmd->new_vss_status_flags & VSS_PLAYING);
+}
- 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);
- }
+/**
+ * Check if the vss is currently stopped.
+ *
+ * \return Greater than zero if paused, zero otherwise.
+ *
+ */
+unsigned int vss_stopped(void)
+{
+ 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;
return -1;
}
-static void vss_next_chunk_time(struct timeval *due)
-{
- struct timeval tmp;
-
- tv_scale(mmd->chunks_sent, &mmd->afi.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) {
+ /* chunk is due or bof */
+ the_timeout.tv_sec = 0;
+ the_timeout.tv_usec = 0;
return &the_timeout;
- /* chunk is due or bof */
- the_timeout.tv_sec = 0;
- the_timeout.tv_usec = 0;
+ }
+ /* compute min of current timeout and next slice time */
+ compute_slice_timeout(&the_timeout);
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();
+ if (!vsst->map)
return;
- }
- gettimeofday(&now, NULL);
- tv_add(&mmd->afi.eof_tv, &now, &eof_barrier);
- munmap(map, mmd->size);
- fclose(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;
+ set_eof_barrier(vsst);
+ para_munmap(vsst->map, mmd->size);
+ vsst->map = NULL;
mmd->chunks_sent = 0;
- mmd->offset = 0;
- mmd->afi.seconds_total = 0;
- free(mmd->afi.chunk_table);
- mmd->afi.chunk_table = NULL;
- free(mmd->afi.header);
- mmd->afi.header = NULL;
- 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->afi.info_string, 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->offset = 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;
+ 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)
-{
- if (mmd->audio_format < 0)
- return NULL;
- *header_len = mmd->afi.header_len;
- return mmd->afi.header;
-}
-
-/**
- * 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.
*/
return SUPPORTED_AUDIO_FORMATS;
}
-/**
- * get the chunk time of the current audio file
- *
- * \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)
+static int need_to_request_new_audio_file(struct vss_task *vsst)
{
- if (mmd->audio_format < 0)
- return NULL;
- return &mmd->afi.chunk_tv;
+ 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;
+}
+
+static void set_mmd_offset(void)
+{
+ struct timeval offset;
+ tv_scale(mmd->current_chunk, &mmd->afd.afhi.chunk_tv, &offset);
+ mmd->offset = tv2ms(&offset);
}
/**
- * compute the timeout for para_server's main select-loop
+ * Compute the timeout for the main select-loop of the scheduler.
*
- * 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()) {
+ struct fec_client *fc, *tmp;
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(&mmd->afi.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 (senders[i].shutdown_clients)
+ senders[i].shutdown_clients();
+ list_for_each_entry_safe(fc, tmp, &fec_client_list, node) {
+ fc->first_stream_chunk = -1;
+ fc->error = 0;
}
- mmd->chunks_sent = 0;
+ mmd->stream_start.tv_sec = 0;
+ mmd->stream_start.tv_usec = 0;
}
- if (vss_repos()) {
- mmd->new_vss_status_flags &= ~(VSS_REPOS);
+ if (vss_next())
+ vss_eof(vsst);
+ else if (vss_paused()) {
+ if (mmd->chunks_sent)
+ set_eof_barrier(vsst);
+ mmd->chunks_sent = 0;
+ } else if (vss_repos()) {
+ tv_add(now, &vsst->announce_tv, &vsst->data_send_barrier);
+ set_eof_barrier(vsst);
+ mmd->chunks_sent = 0;
mmd->current_chunk = mmd->repos_request;
+ mmd->new_vss_status_flags &= ~VSS_REPOS;
+ set_mmd_offset();
}
- 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");
- vss_get_audio_file();
- 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);
}
- return ret;
+ 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;
+ 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;
+ }
+ 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.
+ * This function gets called from vss_post_select(). It checks whether 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 as well as to the send()
+ * functions of each registered fec client.
*/
-void vss_send_chunk(void)
+static void vss_send(struct vss_task *vsst)
{
- int i;
- struct audio_format_handler *af;
- ssize_t pos, len;
- struct timeval now, due;
+ int i, fec_active = 0;
+ struct timeval due;
+ struct fec_client *fc, *tmp_fc;
- if (mmd->audio_format < 0 || !audio_file || !vss_playing())
- return;
- af = &afl[mmd->audio_format];
- gettimeofday(&now, NULL);
- vss_next_chunk_time(&due);
- if (tv_diff(&due, &now, NULL) > 0)
+ if (!vsst->map || !vss_playing())
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;
- mmd->new_vss_status_flags &= ~VSS_REPOS;
- if (mmd->current_chunk >= mmd->afi.chunks_total) { /* eof */
- mmd->new_vss_status_flags |= VSS_NEXT;
- return vss_eof(af);
+ list_for_each_entry_safe(fc, tmp_fc, &fec_client_list, node) {
+ if (fc->error < 0)
+ continue;
+ if (!next_slice_is_due(fc, NULL)) {
+ fec_active = 1;
+ continue;
+ }
+ if (compute_next_fec_slice(fc, vsst) <= 0)
+ continue;
+ PARA_DEBUG_LOG("sending %d:%d (%u bytes)\n", fc->group.num,
+ fc->current_slice_num, fc->fcp->max_slice_bytes);
+ fc->fcp->send((char *)fc->enc_buf,
+ fc->fcp->max_slice_bytes,
+ fc->fcp->private_data);
+ fc->current_slice_num++;
+ fec_active = 1;
}
- pos = mmd->afi.chunk_table[mmd->current_chunk];
- len = mmd->afi.chunk_table[mmd->current_chunk + 1] - pos;
- /*
- * 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) {
+ if (mmd->current_chunk >= mmd->afd.afhi.chunks_total) { /* eof */
+ if (!fec_active)
+ mmd->new_vss_status_flags |= VSS_NEXT;
+ return;
+ }
+ compute_chunk_time(mmd->chunks_sent, &mmd->afd.afhi.chunk_tv,
+ &mmd->stream_start, &due);
+ if (tv_diff(&due, now, NULL) <= 0) {
+ const char *buf;
+ size_t len;
+
+ if (!mmd->chunks_sent) {
+ mmd->stream_start = *now;
+ mmd->events++;
+ set_mmd_offset();
+ }
+ /*
+ * 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.
+ */
+ afh_get_chunk(mmd->current_chunk, &mmd->afd.afhi, vsst->map,
+ &buf, &len);
+ for (i = 0; senders[i].name; i++) {
+ if (!senders[i].send)
+ continue;
+ senders[i].send(mmd->current_chunk, mmd->chunks_sent,
+ buf, len, vsst->header_buf, vsst->header_len);
+ }
+ 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");
+ if (ret < 0)
+ PARA_CRIT_LOG("%s\n", para_strerror(-ret));
+ else
+ 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(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->header_interval.tv_sec = 5; /* should this be configurable? */
+ 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));
+ INIT_LIST_HEAD(&fec_client_list);
+ 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;
+ if (conf.autoplay_given) {
struct timeval tmp;
- gettimeofday(&mmd->stream_start, NULL);
- tv_scale(mmd->current_chunk, &mmd->afi.chunk_tv, &tmp);
- mmd->offset = tv2ms(&tmp);
- mmd->events++;
+ 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);
}
- for (i = 0; senders[i].name; i++)
- senders[i].send(mmd->current_chunk, mmd->chunks_sent,
- map + pos, len);
- mmd->new_vss_status_flags |= VSS_PLAYING;
- mmd->chunks_sent++;
- mmd->current_chunk++;
+ register_task(&vsst->task);
}
projects / paraslash.git / blobdiff