input/ffmpeg: new input plugin using libavformat's "avio" library

2 files changed, 196 insertions, 0 deletions

diff --git a/src/input/ffmpeg_input_plugin.c b/src/input/ffmpeg_input_plugin.c
new file mode 100644
index 000000000..0a6be29bc
--- /dev/null
+++ b/src/input/ffmpeg_input_plugin.c
@@ -0,0 +1,168 @@
+/*
+ * Copyright (C) 2003-2010 The Music Player Daemon Project
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "input/ffmpeg_input_plugin.h"
+#include "input_plugin.h"
+
+#ifdef OLD_FFMPEG_INCLUDES
+#include <avio.h>
+#include <avformat.h>
+#else
+#include <libavformat/avio.h>
+#include <libavformat/avformat.h>
+#endif
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "input_ffmpeg"
+
+struct input_ffmpeg {
+	struct input_stream base;
+
+	URLContext *h;
+
+	bool eof;
+};
+
+static inline GQuark
+ffmpeg_quark(void)
+{
+	return g_quark_from_static_string("ffmpeg");
+}
+
+static bool
+input_ffmpeg_init(G_GNUC_UNUSED const struct config_param *param,
+		  G_GNUC_UNUSED GError **error_r)
+{
+	av_register_all();
+
+#if LIBAVFORMAT_VERSION_MAJOR >= 52
+	/* disable this plugin if there's no registered protocol */
+	if (av_protocol_next(NULL) == NULL) {
+		g_set_error(error_r, ffmpeg_quark(), 0,
+			    "No protocol");
+		return false;
+	}
+#endif
+
+	return true;
+}
+
+static struct input_stream *
+input_ffmpeg_open(const char *uri, GError **error_r)
+{
+	struct input_ffmpeg *i;
+
+	if (!g_str_has_prefix(uri, "gopher://") &&
+	    !g_str_has_prefix(uri, "rtp://") &&
+	    !g_str_has_prefix(uri, "rtsp://") &&
+	    !g_str_has_prefix(uri, "rtmp://") &&
+	    !g_str_has_prefix(uri, "rtmpt://") &&
+	    !g_str_has_prefix(uri, "rtmps://"))
+		return NULL;
+
+	i = g_new(struct input_ffmpeg, 1);
+	input_stream_init(&i->base, &input_plugin_ffmpeg, uri);
+
+	int ret = url_open(&i->h, uri, URL_RDONLY);
+	if (ret != 0) {
+		g_free(i);
+		g_set_error(error_r, ffmpeg_quark(), ret,
+			    "libavformat failed to open the URI");
+		return NULL;
+	}
+
+	i->eof = false;
+
+	i->base.ready = true;
+	i->base.seekable = !i->h->is_streamed;
+	i->base.size = url_filesize(i->h);
+
+	/* hack to make MPD select the "ffmpeg" decoder plugin - since
+	   avio.h doesn't tell us the MIME type of the resource, we
+	   can't select a decoder plugin, but the "ffmpeg" plugin is
+	   quite good at auto-detection */
+	i->base.mime = g_strdup("audio/x-mpd-ffmpeg");
+
+	return &i->base;
+}
+
+static size_t
+input_ffmpeg_read(struct input_stream *is, void *ptr, size_t size,
+		  GError **error_r)
+{
+	struct input_ffmpeg *i = (struct input_ffmpeg *)is;
+
+	int ret = url_read(i->h, ptr, size);
+	if (ret <= 0) {
+		if (ret < 0)
+			g_set_error(error_r, ffmpeg_quark(), 0,
+				    "url_read() failed");
+
+		i->eof = true;
+		return false;
+	}
+
+	is->offset += ret;
+	return (size_t)ret;
+}
+
+static void
+input_ffmpeg_close(struct input_stream *is)
+{
+	struct input_ffmpeg *i = (struct input_ffmpeg *)is;
+
+	url_close(i->h);
+	input_stream_deinit(&i->base);
+	g_free(i);
+}
+
+static bool
+input_ffmpeg_eof(struct input_stream *is)
+{
+	struct input_ffmpeg *i = (struct input_ffmpeg *)is;
+
+	return i->eof;
+}
+
+static bool
+input_ffmpeg_seek(struct input_stream *is, goffset offset, int whence,
+		  G_GNUC_UNUSED GError **error_r)
+{
+	struct input_ffmpeg *i = (struct input_ffmpeg *)is;
+	int64_t ret = url_seek(i->h, offset, whence);
+
+	if (ret >= 0) {
+		i->eof = false;
+		return true;
+	} else {
+		g_set_error(error_r, ffmpeg_quark(), 0, "url_seek() failed");
+		return false;
+	}
+}
+
+const struct input_plugin input_plugin_ffmpeg = {
+	.name = "ffmpeg",
+	.init = input_ffmpeg_init,
+	.open = input_ffmpeg_open,
+	.close = input_ffmpeg_close,
+	.read = input_ffmpeg_read,
+	.eof = input_ffmpeg_eof,
+	.seek = input_ffmpeg_seek,
+};
diff --git a/src/input/ffmpeg_input_plugin.h b/src/input/ffmpeg_input_plugin.h
new file mode 100644
index 000000000..ff87064be
--- /dev/null
+++ b/src/input/ffmpeg_input_plugin.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2003-2010 The Music Player Daemon Project
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_FFMPEG_INPUT_PLUGIN_H
+#define MPD_FFMPEG_INPUT_PLUGIN_H
+
+/**
+ * An input plugin based on libavformat's "avio" library.
+ */
+extern const struct input_plugin input_plugin_ffmpeg;
+
+#endif