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https://github.com/owntone/owntone-server.git
synced 2024-12-26 07:05:57 -05:00
[pipe] Make Shairport metadata parser work with incomplete reads from pipe
This commit is contained in:
ejurgensen
parent
41c5ef1474
commit
12567d8e93
@ -107,6 +107,8 @@ static struct pipe *pipe_metadata;
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static struct evbuffer *pipe_metadata_buf;
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// Parsed metadata goes here
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static struct input_metadata pipe_metadata_parsed;
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// Mutex to share the parsed metadata
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static pthread_mutex_t pipe_metadata_lock;
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// True if there is new metadata to push to the player
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static bool pipe_metadata_is_new;
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@ -223,31 +225,48 @@ parse_progress(struct input_metadata *m, char *progress)
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m->song_length = (end - start) * 10 / 441; // Convert to ms based on 44100
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}
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// returns 0 on metadata found, otherwise -1
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// returns 1 on metadata found, 0 on nothing, -1 on error
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static int
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parse_item(struct input_metadata *m, mxml_node_t *item)
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parse_item(struct input_metadata *m, const char *item)
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{
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mxml_node_t *xml;
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mxml_node_t *haystack;
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mxml_node_t *needle;
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const char *s;
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uint32_t type;
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uint32_t code;
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char *progress;
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char **data;
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int ret;
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ret = 0;
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xml = mxmlNewXML("1.0");
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if (!xml)
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return -1;
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// DPRINTF(E_DBG, L_PLAYER, "Parsing %s\n", item);
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haystack = mxmlLoadString(xml, item, MXML_NO_CALLBACK);
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if (!haystack)
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{
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DPRINTF(E_LOG, L_PLAYER, "Could not parse pipe metadata\n");
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goto out_error;
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}
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type = 0;
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if ( (needle = mxmlFindElement(item, item, "type", NULL, NULL, MXML_DESCEND)) &&
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if ( (needle = mxmlFindElement(haystack, haystack, "type", NULL, NULL, MXML_DESCEND)) &&
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(s = mxmlGetText(needle, NULL)) )
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sscanf(s, "%8x", &type);
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code = 0;
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if ( (needle = mxmlFindElement(item, item, "code", NULL, NULL, MXML_DESCEND)) &&
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if ( (needle = mxmlFindElement(haystack, haystack, "code", NULL, NULL, MXML_DESCEND)) &&
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(s = mxmlGetText(needle, NULL)) )
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sscanf(s, "%8x", &code);
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if (!type || !code)
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{
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DPRINTF(E_WARN, L_PLAYER, "No type (%d) or code (%d) in pipe metadata\n", type, code);
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return -1;
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DPRINTF(E_LOG, L_PLAYER, "No type (%d) or code (%d) in pipe metadata, aborting\n", type, code);
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goto out_error;
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}
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if (code == dmapval("asal"))
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@ -261,11 +280,13 @@ parse_item(struct input_metadata *m, mxml_node_t *item)
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else if (code == dmapval("prgr"))
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data = &progress;
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else
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return -1;
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goto out_nothing;
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if ( (needle = mxmlFindElement(item, item, "data", NULL, NULL, MXML_DESCEND)) &&
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if ( (needle = mxmlFindElement(haystack, haystack, "data", NULL, NULL, MXML_DESCEND)) &&
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(s = mxmlGetText(needle, NULL)) )
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{
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pthread_mutex_lock(&pipe_metadata_lock);
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if (data != &progress)
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free(*data);
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@ -279,53 +300,64 @@ parse_item(struct input_metadata *m, mxml_node_t *item)
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free(*data);
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}
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return 0;
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pthread_mutex_unlock(&pipe_metadata_lock);
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ret = 1;
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}
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out_nothing:
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mxmlDelete(xml);
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return ret;
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out_error:
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mxmlDelete(xml);
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return -1;
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}
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static char *
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extract_item(struct evbuffer *evbuf)
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{
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struct evbuffer_ptr evptr;
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size_t size;
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char *item;
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evptr = evbuffer_search(evbuf, "</item>", strlen("</item>"), NULL);
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if (evptr.pos < 0)
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return NULL;
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size = evptr.pos + strlen("</item>") + 1;
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item = malloc(size);
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if (!item)
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return NULL;
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evbuffer_remove(evbuf, item, size - 1);
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item[size - 1] = '\0';
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return item;
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}
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static int
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pipe_metadata_parse(struct input_metadata *m, struct evbuffer *evbuf)
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{
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mxml_node_t *xml;
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mxml_node_t *haystack;
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mxml_node_t *item;
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const char *s;
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char *item;
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int found;
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xml = mxmlNewXML("1.0");
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if (!xml)
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return -1;
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s = (char *)evbuffer_pullup(evbuf, -1);
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haystack = mxmlLoadString(xml, s, MXML_NO_CALLBACK);
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if (!haystack)
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{
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DPRINTF(E_LOG, L_PLAYER, "Could not parse pipe metadata\n");
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mxmlDelete(xml);
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evbuffer_drain(evbuf, evbuffer_get_length(evbuf));
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return -1;
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}
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evbuffer_drain(evbuf, evbuffer_get_length(evbuf));
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// DPRINTF(E_DBG, L_PLAYER, "Parsing %s\n", s);
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int ret;
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found = 0;
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for (item = mxmlGetFirstChild(haystack); item; item = mxmlWalkNext(item, haystack, MXML_NO_DESCEND))
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while ((item = extract_item(evbuf)))
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{
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if (mxmlGetType(item) != 0)
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continue;
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if (parse_item(m, item) == 0)
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ret = parse_item(m, item);
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free(item);
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if (ret < 0)
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return -1;
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if (ret > 0)
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found = 1;
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}
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mxmlDelete(xml);
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return found;
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}
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/* ---------------------------- GENERAL PIPE I/O -------------------------- */
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/* Thread: worker */
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@ -538,7 +570,6 @@ pipe_listener_cb(enum listener_event_type type)
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static void
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pipe_metadata_read_cb(evutil_socket_t fd, short event, void *arg)
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{
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struct evbuffer_ptr evptr;
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int ret;
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ret = evbuffer_read(pipe_metadata_buf, pipe_metadata->fd, PIPE_READ_MAX);
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@ -561,16 +592,6 @@ pipe_metadata_read_cb(evutil_socket_t fd, short event, void *arg)
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return;
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}
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// Did we get the end tag? If not return to wait for more data
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evptr = evbuffer_search(pipe_metadata_buf, "</item>", strlen("</item>"), NULL);
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if (evptr.pos < 0)
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{
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goto readd;
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}
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// NULL-terminate the buffer
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evbuffer_add(pipe_metadata_buf, "", 1);
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ret = pipe_metadata_parse(&pipe_metadata_parsed, pipe_metadata_buf);
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if (ret < 0)
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{
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@ -753,10 +774,11 @@ stop(struct player_source *ps)
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return 0;
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}
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// FIXME Thread safety of pipe_metadata_parsed
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static int
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metadata_get(struct input_metadata *metadata, struct player_source *ps, uint64_t rtptime)
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{
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pthread_mutex_lock(&pipe_metadata_lock);
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if (pipe_metadata_parsed.artist)
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swap_pointers(&metadata->artist, &pipe_metadata_parsed.artist);
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if (pipe_metadata_parsed.title)
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@ -778,6 +800,8 @@ metadata_get(struct input_metadata *metadata, struct player_source *ps, uint64_t
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input_metadata_free(&pipe_metadata_parsed, 1);
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pthread_mutex_unlock(&pipe_metadata_lock);
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return 0;
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}
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@ -787,6 +811,8 @@ init(void)
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{
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pipe_autostart = cfg_getbool(cfg_getsec(cfg, "library"), "pipe_autostart");
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CHECK_ERR(L_PLAYER, mutex_init(&pipe_metadata_lock));
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if (pipe_autostart)
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return listener_add(pipe_listener_cb, LISTENER_DATABASE);
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else
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@ -805,6 +831,8 @@ deinit(void)
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pipe_free(pipe);
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}
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CHECK_ERR(L_PLAYER, pthread_mutex_destroy(&pipe_metadata_lock));
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if (pipe_autostart)
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listener_remove(pipe_listener_cb);
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}
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