diff options
Diffstat (limited to 'src/metadata_pipe.c')
| -rw-r--r-- | src/metadata_pipe.c | 151 |
1 files changed, 0 insertions, 151 deletions
diff --git a/src/metadata_pipe.c b/src/metadata_pipe.c deleted file mode 100644 index 83c36ce1b..000000000 --- a/src/metadata_pipe.c +++ /dev/null @@ -1,151 +0,0 @@ -/* the Music Player Daemon (MPD) - * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com) - * This project's homepage is: http://www.musicpd.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 02111-1307 USA - */ - -#include "metadata_pipe.h" -#include "ringbuf.h" -#include "decode.h" -#include "os_compat.h" -#include "log.h" -#include "outputBuffer.h" -#include "gcc.h" - -static struct ringbuf *mp; - -/* Each one of these is a packet inside the metadata pipe */ -struct tag_container { - float metadata_time; - uint8_t seq; /* ob.seq_decoder at time of metadata_pipe_send() */ - struct mpd_tag *tag; /* our payload */ -}; - -/* - * We have two readers even though ringbuf was designed for one (locklessly), - * so we will use a lock to allow readers to safely read. Writing is only - * done from one thread, so it will never block or clobber. - */ -static pthread_mutex_t read_lock = PTHREAD_MUTEX_INITIALIZER; -static struct mpd_tag *current_tag; /* requires read_lock for both r/w access */ - -static void metadata_pipe_finish(void) -{ - ringbuf_free(mp); - if (current_tag) - tag_free(current_tag); -} - -void init_metadata_pipe(void) -{ - mp = ringbuf_create(sizeof(struct tag_container) * 16); - atexit(metadata_pipe_finish); -} - -void metadata_pipe_send(struct mpd_tag *tag, float metadata_time) -{ - struct tag_container tc; - size_t written; - - assert(pthread_equal(pthread_self(), dc.thread)); - - if (mpd_unlikely(ringbuf_write_space(mp) - < sizeof(struct tag_container))) { - DEBUG("metadata_pipe: insufficient buffer space, dropping\n"); - tag_free(tag); - return; - } - - tc.tag = tag; - tc.metadata_time = metadata_time; - tc.seq = ob_get_decoder_sequence(); - written = ringbuf_write(mp, &tc, sizeof(struct tag_container)); - assert(written == sizeof(struct tag_container)); -} - -struct mpd_tag * metadata_pipe_recv(void) -{ - struct tag_container tc; - size_t r; - static const size_t uint8_t_max = 255; /* XXX CLEANUP */ - uint8_t expect_seq = ob_get_player_sequence(); - unsigned long current_time = ob_get_elapsed_time(); - struct mpd_tag *tag = NULL; - - if (pthread_mutex_trylock(&read_lock) == EBUSY) - return NULL; -retry: - if (!(r = ringbuf_peek(mp, &tc, sizeof(struct tag_container)))) - goto out; - - assert(r == sizeof(struct tag_container)); - assert(tc.tag); - if (expect_seq == tc.seq) { - if (current_time < tc.metadata_time) - goto out; /* not ready for tag yet */ - if (tag_equal(tc.tag, current_tag)) { - tag_free(tc.tag); - ringbuf_read_advance(mp, sizeof(struct tag_container)); - goto out; /* nothing changed, don't bother */ - } - tag = tag_dup(tc.tag); - if (current_tag) - tag_free(current_tag); - current_tag = tc.tag; - ringbuf_read_advance(mp, sizeof(struct tag_container)); - } else if (expect_seq > tc.seq || - (!expect_seq && tc.seq == uint8_t_max)) { - DEBUG("metadata_pipe: reader is ahead of writer\n"); - tag_free(tc.tag); - ringbuf_read_advance(mp, sizeof(struct tag_container)); - goto retry; /* read and skip packets */ - } /* else not ready for tag yet */ -out: - pthread_mutex_unlock(&read_lock); - return tag; -} - -struct mpd_tag *metadata_pipe_current(void) -{ - struct mpd_tag *tag; - - assert(! pthread_equal(pthread_self(), dc.thread)); - if (pthread_mutex_trylock(&read_lock) == EBUSY) - return NULL; - tag = current_tag ? tag_dup(current_tag) : NULL; - pthread_mutex_unlock(&read_lock); - - return tag; -} - -void metadata_pipe_clear(void) -{ - struct tag_container tc; - size_t r; - - pthread_mutex_lock(&read_lock); - - while ((r = ringbuf_read(mp, &tc, sizeof(struct tag_container)))) { - assert(r == sizeof(struct tag_container)); - tag_free(tc.tag); - } - - if (current_tag) { - tag_free(current_tag); - current_tag = NULL; - } - - pthread_mutex_unlock(&read_lock); -} |