input_stream: added tag() method

The tag() method reads a tag from the stream.  This replaces the
meta_name and meta_title attributes.

6 files changed, 129 insertions, 78 deletions

diff --git a/src/decoder_api.c b/src/decoder_api.c
index 0f25daad..1f5db3b7 100644
--- a/src/decoder_api.c
+++ b/src/decoder_api.c
@@ -38,7 +38,8 @@ void decoder_initialized(struct decoder * decoder,
 {
 	assert(dc.state == DECODE_STATE_START);
 	assert(decoder != NULL);
-	assert(!decoder->stream_tag_sent);
+	assert(decoder->stream_tag == NULL);
+	assert(decoder->decoder_tag == NULL);
 	assert(!decoder->seeking);
 	assert(audio_format != NULL);
 	assert(audio_format_defined(audio_format));
@@ -135,33 +136,6 @@ size_t decoder_read(struct decoder *decoder,
 }
 
 /**
- * Add the tag items from the input stream (meta_name, meta_title) to
- * a duplicate of the specified tag.  The return value has to be freed
- * with tag_free().  If this function returns NULL, then there are no
- * tags provided by the stream.
- */
-static struct tag *
-tag_add_stream_tags(const struct tag *src_tag, const struct input_stream *is)
-{
-	struct tag *tag;
-
-	assert(src_tag != NULL);
-	assert(is != NULL);
-
-	if ((is->meta_name == NULL || tag_has_type(src_tag, TAG_ITEM_NAME)) &&
-	    (is->meta_title == NULL || tag_has_type(src_tag, TAG_ITEM_TITLE)))
-	    return NULL;
-
-	tag = tag_dup(src_tag);
-	if (is->meta_name != NULL && !tag_has_type(src_tag, TAG_ITEM_NAME))
-		tag_add_item(tag, TAG_ITEM_NAME, is->meta_name);
-	if (is->meta_title != NULL && !tag_has_type(src_tag, TAG_ITEM_TITLE))
-		tag_add_item(tag, TAG_ITEM_TITLE, is->meta_title);
-
-	return tag;
-}
-
-/**
  * All chunks are full of decoded data; wait for the player to free
  * one.
  */
@@ -195,6 +169,25 @@ do_send_tag(struct input_stream *is, const struct tag *tag)
 	return DECODE_COMMAND_NONE;
 }
 
+static bool
+update_stream_tag(struct decoder *decoder, struct input_stream *is)
+{
+	struct tag *tag;
+
+	if (is == NULL)
+		return false;
+
+	tag = input_stream_tag(is);
+	if (tag == NULL)
+		return false;
+
+	if (decoder->stream_tag != NULL)
+		tag_free(decoder->stream_tag);
+
+	decoder->stream_tag = tag;
+	return true;
+}
+
 enum decoder_command
 decoder_data(struct decoder *decoder,
 	     struct input_stream *is,
@@ -214,36 +207,25 @@ decoder_data(struct decoder *decoder,
 	    length == 0)
 		return dc.command;
 
-	if (is != NULL && !decoder->stream_tag_sent) {
-		const struct tag *src;
-		struct tag *tag1, *tag2;
-
-		/* base is the current song's tag, or an empty new
-		   tag if the song has no tag */
-		src = dc.current_song->tag;
-		if (src == NULL)
-			src = tag1 = tag_new();
-		else
-			tag1 = NULL;
-
-		tag2 = tag_add_stream_tags(src, is);
-		if (tag1 != NULL)
-			/* free the empty tag created by tag_new(), we
-			   aren't going to send it */
-			tag_free(tag1);
-
-		if (tag2 != NULL)
-			/* use the composite tag returned by
-			   tag_add_stream_tags() */
-			src = tag2;
-
-		if (src != NULL) {
-			music_pipe_tag(src);
-			if (tag2 != NULL)
-				tag_free(tag2);
-		}
+	/* send stream tags */
+
+	if (update_stream_tag(decoder, is)) {
+		enum decoder_command cmd;
 
-		decoder->stream_tag_sent = true;
+		if (decoder->decoder_tag != NULL) {
+			/* merge with tag from decoder plugin */
+			struct tag *tag;
+
+			tag = tag_merge(decoder->stream_tag,
+					decoder->decoder_tag);
+			cmd = do_send_tag(is, tag);
+			tag_free(tag);
+		} else
+			/* send only the stream tag */
+			cmd = do_send_tag(is, decoder->stream_tag);
+
+		if (cmd != DECODE_COMMAND_NONE)
+			return cmd;
 	}
 
 	if (audio_format_equals(&dc.in_audio_format, &dc.out_audio_format)) {
@@ -299,21 +281,33 @@ enum decoder_command
 decoder_tag(G_GNUC_UNUSED struct decoder *decoder, struct input_stream *is,
 	    const struct tag *tag)
 {
-	struct tag *tag2 = is != NULL ? tag_add_stream_tags(tag, is) : NULL;
 	enum decoder_command cmd;
 
 	assert(dc.state == DECODE_STATE_DECODE);
+	assert(tag != NULL);
+
+	/* save the tag */
+
+	if (decoder->decoder_tag != NULL)
+		tag_free(decoder->decoder_tag);
+	decoder->decoder_tag = tag_dup(tag);
+
+	/* check for a new stream tag */
 
-	if (tag2 != NULL)
-		tag = tag2;
+	update_stream_tag(decoder, is);
 
-	cmd = do_send_tag(is, tag);
+	/* send tag to music pipe */
 
-	if (tag2 != NULL)
-		tag_free(tag2);
+	if (decoder->stream_tag != NULL) {
+		/* merge with tag from input stream */
+		struct tag *merged;
 
-	if (cmd == DECODE_COMMAND_NONE)
-		decoder->stream_tag_sent = true;
+		merged = tag_merge(decoder->stream_tag, decoder->decoder_tag);
+		cmd = do_send_tag(is, merged);
+		tag_free(merged);
+	} else
+		/* send only the decoder tag */
+		cmd = do_send_tag(is, tag);
 
 	return cmd;
 }
diff --git a/src/decoder_internal.h b/src/decoder_internal.h
index 39d6fe8a..bc10475b 100644
--- a/src/decoder_internal.h
+++ b/src/decoder_internal.h
@@ -27,8 +27,11 @@ struct decoder {
 
 	bool seeking;
 
-	/** has the tag from the input stream been sent yet? */
-	bool stream_tag_sent;
+	/** the last tag received from the stream */
+	struct tag *stream_tag;
+
+	/** the last tag received from the decoder plugin */
+	struct tag *decoder_tag;
 };
 
 #endif
diff --git a/src/decoder_thread.c b/src/decoder_thread.c
index 35d6e320..3baa228e 100644
--- a/src/decoder_thread.c
+++ b/src/decoder_thread.c
@@ -38,7 +38,8 @@ decoder_stream_decode(const struct decoder_plugin *plugin,
 	assert(plugin != NULL);
 	assert(plugin->stream_decode != NULL);
 	assert(decoder != NULL);
-	assert(!decoder->stream_tag_sent);
+	assert(decoder->stream_tag == NULL);
+	assert(decoder->decoder_tag == NULL);
 	assert(input_stream != NULL);
 	assert(input_stream->ready);
 	assert(dc.state == DECODE_STATE_START);
@@ -61,7 +62,8 @@ decoder_file_decode(const struct decoder_plugin *plugin,
 	assert(plugin != NULL);
 	assert(plugin->file_decode != NULL);
 	assert(decoder != NULL);
-	assert(!decoder->stream_tag_sent);
+	assert(decoder->stream_tag == NULL);
+	assert(decoder->decoder_tag == NULL);
 	assert(path != NULL);
 	assert(path[0] == '/');
 	assert(dc.state == DECODE_STATE_START);
@@ -88,7 +90,8 @@ static void decoder_run_song(const struct song *song, const char *uri)
 	}
 
 	decoder.seeking = false;
-	decoder.stream_tag_sent = false;
+	decoder.stream_tag = NULL;
+	decoder.decoder_tag = NULL;
 
 	dc.state = DECODE_STATE_START;
 	dc.command = DECODE_COMMAND_NONE;
@@ -186,6 +189,12 @@ static void decoder_run_song(const struct song *song, const char *uri)
 	if (close_instream)
 		input_stream_close(&input_stream);
 
+	if (decoder.stream_tag != NULL)
+		tag_free(decoder.stream_tag);
+
+	if (decoder.decoder_tag != NULL)
+		tag_free(decoder.decoder_tag);
+
 	dc.state = ret ? DECODE_STATE_STOP : DECODE_STATE_ERROR;
 }
 
diff --git a/src/input_curl.c b/src/input_curl.c
index eb2550c6..93c12d98 100644
--- a/src/input_curl.c
+++ b/src/input_curl.c
@@ -20,6 +20,7 @@
 #include "input_stream.h"
 #include "dlist.h"
 #include "config.h"
+#include "tag.h"
 
 #include <assert.h>
 #include <sys/select.h>
@@ -73,6 +74,13 @@ struct input_curl {
 
 	/** error message provided by libcurl */
 	char error[CURL_ERROR_SIZE];
+
+	/** the stream name from the icy-name response header */
+	char *meta_name;
+
+	/** the tag object ready to be requested via
+	    input_stream_tag() */
+	struct tag *tag;
 };
 
 /** libcurl should accept "ICY 200 OK" */
@@ -137,6 +145,9 @@ input_curl_free(struct input_stream *is)
 {
 	struct input_curl *c = is->data;
 
+	if (c->tag != NULL)
+		tag_free(c->tag);
+
 	input_curl_easy_free(c);
 
 	if (c->multi != NULL)
@@ -146,6 +157,16 @@ input_curl_free(struct input_stream *is)
 	g_free(c);
 }
 
+static struct tag *
+input_curl_tag(struct input_stream *is)
+{
+	struct input_curl *c = is->data;
+	struct tag *tag = c->tag;
+
+	c->tag = NULL;
+	return tag;
+}
+
 static bool
 input_curl_multi_info_read(struct input_stream *is)
 {
@@ -367,6 +388,7 @@ static size_t
 input_curl_headerfunction(void *ptr, size_t size, size_t nmemb, void *stream)
 {
 	struct input_stream *is = stream;
+	struct input_curl *c = is->data;
 	const char *header = ptr, *end, *value;
 	char name[64];
 
@@ -410,8 +432,14 @@ input_curl_headerfunction(void *ptr, size_t size, size_t nmemb, void *stream)
 	} else if (strcasecmp(name, "icy-name") == 0 ||
 		   strcasecmp(name, "ice-name") == 0 ||
 		   strcasecmp(name, "x-audiocast-name") == 0) {
-		g_free(is->meta_name);
-		is->meta_name = g_strndup(value, end - value);
+		g_free(c->meta_name);
+		c->meta_name = g_strndup(value, end - value);
+
+		if (c->tag != NULL)
+			tag_free(c->tag);
+
+		c->tag = tag_new();
+		tag_add_item(c->tag, TAG_ITEM_NAME, c->meta_name);
 	}
 
 	return size;
@@ -691,6 +719,8 @@ input_curl_open(struct input_stream *is, const char *url)
 		return false;
 	}
 
+	c->tag = NULL;
+
 	ret = input_curl_easy_init(is);
 	if (!ret) {
 		input_curl_free(is);
@@ -709,6 +739,7 @@ input_curl_open(struct input_stream *is, const char *url)
 const struct input_plugin input_plugin_curl = {
 	.open = input_curl_open,
 	.close = input_curl_close,
+	.tag = input_curl_tag,
 	.buffer = input_curl_buffer,
 	.read = input_curl_read,
 	.eof = input_curl_eof,
diff --git a/src/input_stream.c b/src/input_stream.c
index 3df8fe00..f69debbf 100644
--- a/src/input_stream.c
+++ b/src/input_stream.c
@@ -68,8 +68,6 @@ input_stream_open(struct input_stream *is, const char *url)
 	is->size = -1;
 	is->error = 0;
 	is->mime = NULL;
-	is->meta_name = NULL;
-	is->meta_title = NULL;
 
 	for (unsigned i = 0; i < num_input_plugins; ++i) {
 		const struct input_plugin *plugin = input_plugins[i];
@@ -89,6 +87,16 @@ input_stream_seek(struct input_stream *is, off_t offset, int whence)
 	return is->plugin->seek(is, offset, whence);
 }
 
+struct tag *
+input_stream_tag(struct input_stream *is)
+{
+	assert(is != NULL);
+
+	return is->plugin->tag != NULL
+		? is->plugin->tag(is)
+		: NULL;
+}
+
 size_t
 input_stream_read(struct input_stream *is, void *ptr, size_t size)
 {
@@ -103,8 +111,6 @@ void input_stream_close(struct input_stream *is)
 	is->plugin->close(is);
 
 	g_free(is->mime);
-	g_free(is->meta_name);
-	g_free(is->meta_title);
 }
 
 bool input_stream_eof(struct input_stream *is)
diff --git a/src/input_stream.h b/src/input_stream.h
index 7ed0039a..5761adc1 100644
--- a/src/input_stream.h
+++ b/src/input_stream.h
@@ -29,6 +29,7 @@ struct input_plugin {
 	bool (*open)(struct input_stream *is, const char *url);
 	void (*close)(struct input_stream *is);
 
+	struct tag *(*tag)(struct input_stream *is);
 	int (*buffer)(struct input_stream *is);
 	size_t (*read)(struct input_stream *is, void *ptr, size_t size);
 	bool (*eof)(struct input_stream *is);
@@ -46,8 +47,6 @@ struct input_stream {
 	char *mime;
 
 	void *data;
-	char *meta_name;
-	char *meta_title;
 
 	void *archive;
 };
@@ -67,6 +66,15 @@ input_stream_seek(struct input_stream *is, off_t offset, int whence);
 void input_stream_close(struct input_stream *is);
 bool input_stream_eof(struct input_stream *is);
 
+/**
+ * Reads the tag from the stream.
+ *
+ * @return a tag object which must be freed with tag_free(), or NULL
+ * if the tag has not changed since the last call
+ */
+struct tag *
+input_stream_tag(struct input_stream *is);
+
 /* return value: -1 is error, 1 inidicates stuff was buffered, 0 means nothing
    was buffered */
 int input_stream_buffer(struct input_stream *is);