input_stream: return allocated input_stream objects

Major API redesign: don't let the caller allocate the input_stream
object.  Let each input plugin allocate its own (derived/extended)
input_stream pointer.  The "data" attribute can now be removed, and
all input plugins simply cast the input_stream pointer to their own
structure (with an "struct input_stream base" as the first attribute).

test/dump_playlist.c

@@ -44,8 +44,7 @@ my_log_func(const gchar *log_domain, G_GNUC_UNUSED GLogLevelFlags log_level,
 int main(int argc, char **argv)
 {
 	const char *uri;
-	struct input_stream is;
-	bool stream_open = false;
+	struct input_stream *is = NULL;
 	bool success;
 	GError *error = NULL;
 	struct playlist_provider *playlist;
@@ -88,8 +87,8 @@ int main(int argc, char **argv)
 	if (playlist == NULL) {
 		/* open the stream and wait until it becomes ready */
 
-		success = input_stream_open(&is, uri, &error);
-		if (!success) {
+		is = input_stream_open(uri, &error);
+		if (is == NULL) {
 			if (error != NULL) {
 				g_warning("%s", error->message);
 				g_error_free(error);
@@ -98,8 +97,8 @@ int main(int argc, char **argv)
 			return 2;
 		}
 
-		while (!is.ready) {
-			int ret = input_stream_buffer(&is, &error);
+		while (!is->ready) {
+			int ret = input_stream_buffer(is, &error);
 			if (ret < 0) {
 				/* error */
 				g_warning("%s", error->message);
@@ -112,13 +111,11 @@ int main(int argc, char **argv)
 				g_usleep(10000);
 		}
 
-		stream_open = true;
-
 		/* open the playlist */
 
-		playlist = playlist_list_open_stream(&is, uri);
+		playlist = playlist_list_open_stream(is, uri);
 		if (playlist == NULL) {
-			input_stream_close(&is);
+			input_stream_close(is);
 			g_printerr("Failed to open playlist\n");
 			return 2;
 		}
@@ -145,8 +142,8 @@ int main(int argc, char **argv)
 	/* deinitialize everything */
 
 	playlist_plugin_close(playlist);
-	if (stream_open)
-		input_stream_close(&is);
+	if (is != NULL)
+		input_stream_close(is);
 	playlist_list_global_finish();
 	input_stream_global_finish();
 	config_global_finish();

test/read_tags.c

@@ -170,17 +170,17 @@ int main(int argc, char **argv)
 
 	tag = decoder_plugin_tag_dup(plugin, path);
 	if (tag == NULL && plugin->stream_tag != NULL) {
-		struct input_stream is;
+		struct input_stream *is = input_stream_open(path, &error);
 
-		if (!input_stream_open(&is, path, &error)) {
+		if (is == NULL) {
 			g_printerr("Failed to open %s: %s\n",
 				   path, error->message);
 			g_error_free(error);
 			return 1;
 		}
 
-		tag = decoder_plugin_stream_tag(plugin, &is);
-		input_stream_close(&is);
+		tag = decoder_plugin_stream_tag(plugin, is);
+		input_stream_close(is);
 	}
 
 	decoder_plugin_deinit_all();

test/run_decoder.c

@@ -145,7 +145,6 @@ decoder_tag(G_GNUC_UNUSED struct decoder *decoder,
 int main(int argc, char **argv)
 {
 	GError *error = NULL;
-	bool ret;
 	const char *decoder_name;
 	struct decoder decoder;
 
@@ -179,10 +178,9 @@ int main(int argc, char **argv)
 		decoder_plugin_file_decode(decoder.plugin, &decoder,
 					   decoder.uri);
 	} else if (decoder.plugin->stream_decode != NULL) {
-		struct input_stream is;
-
-		ret = input_stream_open(&is, decoder.uri, &error);
-		if (!ret) {
+		struct input_stream *is =
+			input_stream_open(decoder.uri, &error);
+		if (is == NULL) {
 			if (error != NULL) {
 				g_warning("%s", error->message);
 				g_error_free(error);
@@ -192,9 +190,9 @@ int main(int argc, char **argv)
 			return 1;
 		}
 
-		decoder_plugin_stream_decode(decoder.plugin, &decoder, &is);
+		decoder_plugin_stream_decode(decoder.plugin, &decoder, is);
 
-		input_stream_close(&is);
+		input_stream_close(is);
 	} else {
 		g_printerr("Decoder plugin is not usable\n");
 		return 1;

test/run_input.c

@@ -103,7 +103,7 @@ dump_input_stream(struct input_stream *is)
 int main(int argc, char **argv)
 {
 	GError *error = NULL;
-	struct input_stream is;
+	struct input_stream *is;
 	int ret;
 
 	if (argc != 2) {
@@ -133,9 +133,10 @@ int main(int argc, char **argv)
 
 	/* open the stream and dump it */
 
-	if (input_stream_open(&is, argv[1], &error)) {
-		ret = dump_input_stream(&is);
-		input_stream_close(&is);
+	is = input_stream_open(argv[1], &error);
+	if (is != NULL) {
+		ret = dump_input_stream(is);
+		input_stream_close(is);
 	} else {
 		if (error != NULL) {
 			g_warning("%s", error->message);