/*
- * Copyright (C) 1997-2007 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 1997-2009 Andre Noll <maan@systemlinux.org>
*
* 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 streaming code of para_server which is independent
* of the current audio format, audio file selector and of the activated
* senders.
*/
-#include <sys/mman.h> /* mmap */
-#include <sys/time.h> /* gettimeofday */
-#include <sys/types.h>
+#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 "net.h"
#include "server.cmdline.h"
+#include "list.h"
#include "vss.h"
#include "send.h"
#include "ipc.h"
#include "fd.h"
+#include "sched.h"
-extern const char *status_item_list[];
+extern struct misc_meta_data *mmd;
-static struct timeval announce_tv;
-static struct timeval data_send_barrier;
-static struct timeval eof_barrier;
-static struct timeval autoplay_barrier;
+extern void dccp_send_init(struct sender *);
+extern void http_send_init(struct sender *);
+extern void udp_send_init(struct sender *);
+
+/** The list of supported senders. */
+struct sender senders[] = {
+ {
+ .name = "http",
+ .init = http_send_init,
+ },
+ {
+ .name = "dccp",
+ .init = dccp_send_init,
+ },
+ {
+ .name = "udp",
+ .init = udp_send_init,
+ },
+ {
+ .name = NULL,
+ }
+};
-extern struct misc_meta_data *mmd;
-extern struct sender senders[];
+/** 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;
+
+/**
+ * Data associated with one FEC group.
+ *
+ * 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.
+ */
+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 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)
+{
+ 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;
+}
+
+/**
+ * Write a fec header to a buffer.
+ *
+ * \param buf The buffer to write to.
+ * \param h The fec header to write.
+ */
+static void write_fec_header(struct fec_client *fc, struct vss_task *vsst)
+{
+ 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;
+}
+
+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 timeval tmp, *chunk_tv = vss_chunk_time();
+ struct fec_group *g = &fc->group;
+ unsigned slice_bytes = fc->fcp->max_slice_bytes - FEC_HEADER_SIZE;
+ uint32_t max_data_size;
+
+ assert(chunk_tv);
+ k = fc->fcp->data_slices_per_group + fc->num_extra_slices;
+ if (fc->first_stream_chunk < 0) {
+ uint32_t largest = afh_get_largest_chunk_size(&mmd->afd.afhi)
+ + vsst->header_len;
+ uint8_t needed, want;
+
+ ret = num_slices(largest, fc, &needed);
+ if (ret < 0)
+ return ret;
+ if (needed > fc->fcp->data_slices_per_group)
+ PARA_WARNING_LOG("fec parms insufficient for this audio file\n");
+ want = PARA_MAX(needed, fc->fcp->data_slices_per_group);
+ if (want != k) {
+ fec_free(fc->parms);
+ fc->src_data = para_realloc(fc->src_data, want * sizeof(char *));
+ ret = fec_new(want, want + fc->fcp->slices_per_group
+ - fc->fcp->data_slices_per_group, &fc->parms);
+ if (ret < 0)
+ return ret;
+ k = want;
+ fc->num_extra_slices = 0;
+ if (k > fc->fcp->data_slices_per_group) {
+ fc->num_extra_slices = k - fc->fcp->data_slices_per_group;
+ PARA_NOTICE_LOG("using %d extra slices\n",
+ fc->num_extra_slices);
+ }
+ }
+ fc->stream_start = *now;
+ fc->first_stream_chunk = mmd->current_chunk;
+ g->first_chunk = mmd->current_chunk;
+ g->num = 0;
+ } else {
+ 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;
+
+ /* 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;
+ }
-static char *map;
+ /* 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;
+ }
+
+ /* setup group timing */
+ tv_scale(g->first_chunk - fc->first_stream_chunk, chunk_tv, &tmp);
+ tv_add(&fc->stream_start, &tmp, &g->start);
+ if (g->num) /* quick hack to avoid buffer underruns */
+ g->start.tv_sec--;
+ tv_scale(g->num_chunks, chunk_tv, &tmp); /* group duration */
+ tv_divide(fc->fcp->slices_per_group + fc->num_extra_slices,
+ &tmp, &g->slice_duration);
+
+ 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
+ );
+ PARA_DEBUG_LOG("durations (group/chunk/slice): %lu/%lu/%lu\n",
+ tv2ms(&tmp), tv2ms(chunk_tv), tv2ms(&g->slice_duration));
+ 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;
+}
+
+/**
+ * Return a buffer that marks the end of the stream.
+ *
+ * \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.
+ */
+size_t vss_get_fec_eof_packet(const char **buf)
+{
+ static const char fec_eof_packet[FEC_HEADER_SIZE] = FEC_EOF_PACKET;
+ *buf = fec_eof_packet;
+ return FEC_HEADER_SIZE;
+}
+
+/**
+ * Add one entry to the list of active fec clients.
+ *
+ * \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.
+ */
+int vss_add_fec_client(struct fec_client_parms *fcp, struct fec_client **result)
+{
+ 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;
+}
+
+/**
+ * Remove one entry from the list of active fec clients.
+ *
+ * \param fc The client to be removed.
+ */
+void vss_del_fec_client(struct fec_client *fc)
+{
+ list_del(&fc->node);
+ free(fc->src_data);
+ free(fc->enc_buf);
+ free(fc->extra_src_buf);
+ fec_free(fc->parms);
+ free(fc);
+}
+
+/*
+ * 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
+ *
+ * next = stream_start + (first_group_chunk - first_stream_chunk)
+ * * chunk_time + slice_num * slice_time
+ */
+static int next_slice_is_due(struct fec_client *fc, struct timeval *diff)
+{
+ struct timeval tmp, next;
+ int ret;
+
+ 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 void set_eof_barrier(struct vss_task *vsst)
+{
+ 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);
+}
/**
- * 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)
}
/**
- * 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)
}
/**
- * 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)
}
/**
- * 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)
}
/**
- * initialize the virtual streaming system
+ * Check if the vss is currently stopped.
+ *
+ * \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();
- 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;
- ms2tv(announce_time, &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(autoplay_delay, &tmp);
- tv_add(&now, &tmp, &autoplay_barrier);
- }
+ 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->afd.afhi.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() && map) {
+ 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 (!vss_playing() || !map)
+ if (!vss_playing() || !vsst->map)
return NULL;
- vss_next_chunk_time(&next_chunk);
- if (chk_barrier(audio_format_name(mmd->afd.afsi.audio_format_id),
- &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(void)
+static void vss_eof(struct vss_task *vsst)
{
- struct timeval now;
- int i;
- char *tmp;
- PARA_NOTICE_LOG("EOF\n");
- if (!map) {
- for (i = 0; senders[i].name; i++)
- senders[i].shutdown_clients();
+ if (!vsst->map)
return;
- }
- gettimeofday(&now, NULL);
- tv_add(&mmd->afd.afhi.eof_tv, &now, &eof_barrier);
- munmap(map, mmd->size);
- map = 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->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;
- 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->afd.afhi.info_string, tmp);
- free(tmp);
- mmd->afd.path[0] = '\0';
- mmd->afd.afsi.lyrics_id = 0;
- mmd->afd.afsi.image_id = 0;
mmd->mtime = 0;
- mmd->afd.attributes_string[0] = '\0';
mmd->size = 0;
mmd->events++;
}
/**
- * Get the header of the current audio file.
+ * Get the list of all supported audio formats.
*
- * \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(size_t *header_len)
-{
- if (!map || !mmd->afd.afhi.header_len)
- return NULL;
- *header_len = mmd->afd.afhi.header_len;
- return map + mmd->afd.afhi.header_offset;
-}
-
-/**
- * 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 (!map)
- return NULL;
- return &mmd->afd.afhi.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;
}
-enum afs_socket_status {
- AFS_SOCKET_READY,
- AFS_SOCKET_CHECK_FOR_WRITE,
- AFS_SOCKET_AFD_PENDING
-};
-
-static enum afs_socket_status afsss;
-
/**
- * 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.
* - request a new audio file from afs,
* - 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.
*/
-struct timeval *vss_preselect(fd_set *rfds, fd_set *wfds, int *max_fileno)
+static void vss_pre_select(struct sched *s, struct task *t)
{
int i;
- struct timeval *tv;
+ struct timeval *tv, diff;
+ struct vss_task *vsst = container_of(t, struct vss_task, task);
- para_fd_set(afs_socket, rfds, max_fileno);
- if (!map)
+ 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();
- else {
- if (vss_next()) {
- vss_eof();
- return vss_compute_timeout();
+ 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->stream_start.tv_sec = 0;
+ mmd->stream_start.tv_usec = 0;
}
- if (vss_paused() || vss_repos()) {
- for (i = 0; senders[i].name; i++)
- senders[i].shutdown_clients();
- if (map) {
- struct timeval now;
- gettimeofday(&now, NULL);
- if (!vss_paused() || mmd->chunks_sent)
- tv_add(&mmd->afd.afhi.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)
+ 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;
- }
- if (vss_repos()) {
- mmd->new_vss_status_flags &= ~(VSS_REPOS);
mmd->current_chunk = mmd->repos_request;
+ mmd->new_vss_status_flags &= ~VSS_REPOS;
}
- tv = vss_compute_timeout();
- if (tv)
- return tv;
- if (!map && vss_playing() &&
- !(mmd->new_vss_status_flags & VSS_NOMORE)) {
- PARA_DEBUG_LOG("%s", "ready and playing, but no audio file\n");
- if (afsss == AFS_SOCKET_READY) {
- para_fd_set(afs_socket, wfds, max_fileno);
- afsss = AFS_SOCKET_CHECK_FOR_WRITE;
- }
+ 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 tv;
+ tv = vss_compute_timeout(vsst);
+ if (tv && tv_diff(tv, &s->timeout, &diff) < 0)
+ s->timeout = *tv;
}
-static int recv_afs_msg(int *fd, uint32_t *code, uint32_t *data)
+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 iovec iov;
int ret = 0;
+ *fd = -1;
iov.iov_base = buf;
iov.iov_len = sizeof(buf);
msg.msg_iov = &iov;
if (ret < 0)
return -ERRNO_TO_PARA_ERROR(errno);
if (iov.iov_len != sizeof(buf))
- return -E_SHORT_AFS_READ;
+ return -E_AFS_SHORT_READ;
*code = *(uint32_t*)buf;
*data = *(uint32_t*)(buf + 4);
- cmsg = CMSG_FIRSTHDR(&msg);
for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
if (cmsg->cmsg_level != SOL_SOCKET
|| cmsg->cmsg_type != SCM_RIGHTS)
- continue;
+ continue;
if ((cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int) != 1)
- continue;
+ continue;
*fd = *(int *)CMSG_DATA(cmsg);
}
return 1;
}
-static void recv_afs_result(void)
+static void recv_afs_result(struct vss_task *vsst)
{
- int ret, passed_fd = -1, shmid;
+ int ret, passed_fd, shmid;
uint32_t afs_code = 0, afs_data = 0;
struct stat statbuf;
- struct timeval now;
- PARA_NOTICE_LOG("recv\n");
- ret = recv_afs_msg(&passed_fd, &afs_code, &afs_data);
+ vsst->afsss = AFS_SOCKET_READY;
+ ret = recv_afs_msg(vsst->afs_socket, &passed_fd, &afs_code, &afs_data);
if (ret < 0)
goto err;
- PARA_NOTICE_LOG("got the fd: %d, code: %u, shmid: %u\n",
- passed_fd, afs_code, afs_data);
- ret = -E_BAD_AFS_CODE;
+ 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;
- afsss = AFS_SOCKET_READY;
+ if (passed_fd < 0)
+ goto err;
shmid = afs_data;
ret = load_afd(shmid, &mmd->afd);
if (ret < 0)
goto err;
shm_destroy(shmid);
- PARA_NOTICE_LOG("next audio file: %s (%lu chunks)\n", mmd->afd.path,
- mmd->afd.afhi.chunks_total);
ret = fstat(passed_fd, &statbuf);
if (ret < 0) {
PARA_ERROR_LOG("fstat error:\n");
}
mmd->size = statbuf.st_size;
mmd->mtime = statbuf.st_mtime;
- map = para_mmap(mmd->size, PROT_READ, MAP_PRIVATE,
- passed_fd, 0);
+ ret = para_mmap(mmd->size, PROT_READ, MAP_PRIVATE, passed_fd,
+ 0, &vsst->map);
+ if (ret < 0)
+ goto err;
close(passed_fd);
- mmd->afd.afhi.header_len = 0; /* default: no header */
mmd->chunks_sent = 0;
mmd->current_chunk = 0;
mmd->offset = 0;
mmd->events++;
mmd->num_played++;
mmd->new_vss_status_flags &= (~VSS_NEXT);
- gettimeofday(&now, NULL);
- tv_add(&now, &announce_tv, &data_send_barrier);
+ 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));
+ PARA_ERROR_LOG("%s\n", para_strerror(-ret));
+ mmd->new_vss_status_flags = VSS_NEXT;
}
-void vss_post_select(fd_set *rfds, fd_set *wfds)
+/**
+ * Main sending function.
+ *
+ * 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.
+ */
+static void vss_send(struct vss_task *vsst)
{
- int ret;
+ int i, sent_something = 0;
+ struct timeval due;
+ struct fec_client *fc, *tmp_fc;
- if (FD_ISSET(afs_socket, rfds))
- recv_afs_result();
- if (afsss != AFS_SOCKET_CHECK_FOR_WRITE || !FD_ISSET(afs_socket, wfds))
+ if (!vsst->map || !vss_playing())
+ return;
+ if (chk_barrier("eof", &vsst->eof_barrier, &due, 1) < 0)
return;
- PARA_NOTICE_LOG("requesting new socket\n");
- ret = send_buffer(afs_socket, "new");
- afsss = AFS_SOCKET_AFD_PENDING;
+ if (chk_barrier("data send", &vsst->data_send_barrier,
+ &due, 1) < 0)
+ return;
+ list_for_each_entry_safe(fc, tmp_fc, &fec_client_list, node) {
+ if (fc->error < 0)
+ continue;
+ if (!next_slice_is_due(fc, NULL))
+ 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++;
+ sent_something = 1;
+ }
+ if (mmd->current_chunk >= mmd->afd.afhi.chunks_total) { /* eof */
+ if (!sent_something)
+ 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) {
+ struct timeval tmp;
+ mmd->stream_start = *now;
+ tv_scale(mmd->current_chunk, &mmd->afd.afhi.chunk_tv, &tmp);
+ mmd->offset = tv2ms(&tmp);
+ mmd->events++;
+ }
+ /*
+ * 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 get_chunk(long unsigned chunk_num, char **buf, size_t *len)
+static void vss_post_select(struct sched *s, struct task *t)
{
- size_t pos = mmd->afd.afhi.chunk_table[chunk_num];
- *buf = map + pos;
- *len = mmd->afd.afhi.chunk_table[chunk_num + 1] - pos;
-}
+ int ret, i;
+ struct vss_task *vsst = container_of(t, struct vss_task, task);
-/**
- * Get the data of the given chunk.
- *
- * \param chunk_num The number of the desired chunk.
- * \param buf Chunk data.
- * \param len Chunk length in bytes.
- *
- * \return Positive on success, negative on errors.
- */
-int vss_get_chunk(long unsigned chunk_num, char **buf, size_t *len)
-{
- if (!map || !vss_playing())
- return -E_CHUNK;
- if (chunk_num >= mmd->afd.afhi.chunks_total)
- return -E_CHUNK;
- get_chunk(chunk_num, buf, len);
- return 1;
+
+ 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);
}
/**
- * main sending function
+ * Initialize the virtual streaming system task.
+ *
+ * \param afs_socket The fd for communication with afs.
*
- * 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 also initializes all supported senders and starts streaming
+ * if the --autoplay command line flag was given.
*/
-void vss_send_chunk(void)
+void init_vss_task(int afs_socket)
{
+ static struct vss_task vss_task_struct, *vsst = &vss_task_struct;
int i;
- struct timeval now, due;
- char *buf;
- size_t len;
-
- if (!map || !vss_playing())
- return;
- gettimeofday(&now, NULL);
- vss_next_chunk_time(&due);
- if (tv_diff(&due, &now, NULL) > 0)
- return;
- if (chk_barrier("eof", &now, &eof_barrier, &due, 1) < 0)
- return;
- if (chk_barrier("data send", &now, &data_send_barrier,
- &due, 1) < 0)
- return;
- mmd->new_vss_status_flags &= ~VSS_REPOS;
- if (mmd->current_chunk >= mmd->afd.afhi.chunks_total) { /* eof */
- mmd->new_vss_status_flags |= VSS_NEXT;
- return vss_eof();
+ 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]);
}
- /*
- * 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) {
+ 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->afd.afhi.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);
}
- get_chunk(mmd->current_chunk, &buf, &len);
- for (i = 0; senders[i].name; i++)
- senders[i].send(mmd->current_chunk, mmd->chunks_sent, buf, len);
- mmd->new_vss_status_flags |= VSS_PLAYING;
- mmd->chunks_sent++;
- mmd->current_chunk++;
+ register_task(&vsst->task);
}
projects / paraslash.git / blobdiff