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Original commit message from CVS: 2005-11-22 Andy Wingo <wingo@pobox.com> * Update for gst_tag_setter API changes.
593 lines
17 KiB
C
593 lines
17 KiB
C
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/* GStreamer
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* Copyright (C) 2003 Christophe Fergeau <teuf@gnome.org>
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*
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* gstflactag.c: plug-in for reading/modifying vorbis comments in flac files
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gst/gsttagsetter.h>
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#include <gst/tag/tag.h>
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#include <string.h>
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#define GST_TYPE_FLAC_TAG (gst_flac_tag_get_type())
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#define GST_FLAC_TAG(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_FLAC_TAG, GstFlacTag))
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#define GST_FLAC_TAG_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_FLAC_TAG, GstFlacTag))
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#define GST_IS_FLAC_TAG(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_FLAC_TAG))
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#define GST_IS_FLAC_TAG_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_FLAC_TAG))
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typedef struct _GstFlacTag GstFlacTag;
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typedef struct _GstFlacTagClass GstFlacTagClass;
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static inline gint
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min (gint a, gint b)
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{
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if (a < b) {
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return a;
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} else {
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return b;
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}
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}
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typedef enum
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{
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GST_FLAC_TAG_STATE_INIT,
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GST_FLAC_TAG_STATE_METADATA_BLOCKS,
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GST_FLAC_TAG_STATE_METADATA_NEXT_BLOCK,
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GST_FLAC_TAG_STATE_WRITING_METADATA_BLOCK,
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GST_FLAC_TAG_STATE_VC_METADATA_BLOCK,
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GST_FLAC_TAG_STATE_ADD_VORBIS_COMMENT,
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GST_FLAC_TAG_STATE_AUDIO_DATA
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}
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GstFlacTagState;
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struct _GstFlacTag
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{
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GstElement element;
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/* pads */
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GstPad *sinkpad;
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GstPad *srcpad;
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GstFlacTagState state;
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GstBuffer *buffer;
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GstBuffer *vorbiscomment;
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GstTagList *tags;
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guint metadata_bytes_remaining;
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gboolean metadata_last_block;
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gboolean only_output_tags;
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};
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struct _GstFlacTagClass
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{
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GstElementClass parent_class;
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};
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/* elementfactory information */
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static GstElementDetails gst_flac_tag_details =
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GST_ELEMENT_DETAILS ("flac retagger",
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"Tag",
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"Rewrite tags in a FLAC file",
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"Christope Fergeau <teuf@gnome.org>");
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/* signals and args */
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enum
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{
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/* FILL ME */
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LAST_SIGNAL
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};
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enum
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{
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ARG_0
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/* FILL ME */
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};
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static GstStaticPadTemplate flac_tag_src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("audio/x-flac; application/x-gst-tags")
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);
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static GstStaticPadTemplate flac_tag_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("audio/x-flac")
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);
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static void gst_flac_tag_base_init (gpointer g_class);
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static void gst_flac_tag_class_init (GstFlacTagClass * klass);
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static void gst_flac_tag_init (GstFlacTag * tag);
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static void gst_flac_tag_chain (GstPad * pad, GstData * data);
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static GstStateChangeReturn gst_flac_tag_change_state (GstElement * element,
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GstStateChange transition);
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static GstElementClass *parent_class = NULL;
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/* static guint gst_flac_tag_signals[LAST_SIGNAL] = { 0 }; */
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GType
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gst_flac_tag_get_type (void)
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{
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static GType flac_tag_type = 0;
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if (!flac_tag_type) {
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static const GTypeInfo flac_tag_info = {
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sizeof (GstFlacTagClass),
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gst_flac_tag_base_init,
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NULL,
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(GClassInitFunc) gst_flac_tag_class_init,
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NULL,
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NULL,
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sizeof (GstFlacTag),
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0,
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(GInstanceInitFunc) gst_flac_tag_init,
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};
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static const GInterfaceInfo tag_setter_info = {
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NULL,
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NULL,
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NULL
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};
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flac_tag_type =
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g_type_register_static (GST_TYPE_ELEMENT, "GstFlacTag", &flac_tag_info,
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0);
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g_type_add_interface_static (flac_tag_type, GST_TYPE_TAG_SETTER,
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&tag_setter_info);
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}
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return flac_tag_type;
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}
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static void
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gst_flac_tag_base_init (gpointer g_class)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
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gst_element_class_set_details (element_class, &gst_flac_tag_details);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&flac_tag_sink_template));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&flac_tag_src_template));
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}
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static void
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send_eos (GstFlacTag * tag)
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{
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gst_element_set_eos (GST_ELEMENT (tag));
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gst_pad_push (tag->srcpad, GST_DATA (gst_event_new (GST_EVENT_EOS)));
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/* Seek to end of sink stream */
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if (gst_pad_send_event (GST_PAD_PEER (tag->sinkpad),
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gst_event_new_seek (GST_FORMAT_BYTES | GST_SEEK_METHOD_END |
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GST_SEEK_FLAG_FLUSH, 0))) {
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} else {
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g_warning ("Couldn't seek to eos on sinkpad\n");
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}
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}
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static gboolean
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caps_nego (GstFlacTag * tag)
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{
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/* do caps nego */
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GstCaps *caps;
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caps = gst_caps_new_simple ("audio/x-flac", NULL);
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if (gst_pad_try_set_caps (tag->srcpad, caps) != GST_PAD_LINK_REFUSED) {
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tag->only_output_tags = FALSE;
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GST_LOG_OBJECT (tag, "normal operation, using audio/x-flac output");
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} else {
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if (gst_pad_try_set_caps (tag->srcpad,
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gst_caps_new_simple ("application/x-gst-tags", NULL))
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!= GST_PAD_LINK_REFUSED) {
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tag->only_output_tags = TRUE;
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GST_LOG_OBJECT (tag, "fast operation, just outputting tags");
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printf ("output tags only\n");
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} else {
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return FALSE;
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}
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}
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return TRUE;
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}
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static void
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gst_flac_tag_class_init (GstFlacTagClass * klass)
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{
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GstElementClass *gstelement_class;
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GObjectClass *gobject_class;
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gstelement_class = (GstElementClass *) klass;
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gobject_class = (GObjectClass *) klass;
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parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
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gstelement_class->change_state = gst_flac_tag_change_state;
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}
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static void
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gst_flac_tag_init (GstFlacTag * tag)
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{
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/* create the sink and src pads */
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tag->sinkpad =
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gst_pad_new_from_template (gst_static_pad_template_get
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(&flac_tag_sink_template), "sink");
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gst_element_add_pad (GST_ELEMENT (tag), tag->sinkpad);
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gst_pad_set_chain_function (tag->sinkpad,
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GST_DEBUG_FUNCPTR (gst_flac_tag_chain));
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tag->srcpad =
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gst_pad_new_from_template (gst_static_pad_template_get
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(&flac_tag_src_template), "src");
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gst_element_add_pad (GST_ELEMENT (tag), tag->srcpad);
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tag->buffer = NULL;
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}
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#define FLAC_MAGIC "fLaC"
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#define FLAC_MAGIC_SIZE (sizeof (FLAC_MAGIC) - 1)
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static void
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gst_flac_tag_chain (GstPad * pad, GstData * data)
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{
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GstBuffer *buffer;
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GstFlacTag *tag;
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if (GST_IS_EVENT (data)) {
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g_print ("Unhandled event\n");
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return;
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}
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buffer = GST_BUFFER (data);
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tag = GST_FLAC_TAG (gst_pad_get_parent (pad));
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if (tag->buffer) {
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GstBuffer *merge;
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merge = gst_buffer_merge (tag->buffer, buffer);
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gst_buffer_unref (buffer);
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gst_buffer_unref (tag->buffer);
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tag->buffer = merge;
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} else {
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tag->buffer = buffer;
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}
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/* Initial state, we don't even know if we are dealing with a flac file */
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if (tag->state == GST_FLAC_TAG_STATE_INIT) {
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if (!caps_nego (tag)) {
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return;
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}
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if (GST_BUFFER_SIZE (tag->buffer) < sizeof (FLAC_MAGIC)) {
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return;
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}
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if (strncmp (GST_BUFFER_DATA (tag->buffer), FLAC_MAGIC,
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FLAC_MAGIC_SIZE) == 0) {
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GstBuffer *sub;
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tag->state = GST_FLAC_TAG_STATE_METADATA_BLOCKS;
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sub = gst_buffer_create_sub (tag->buffer, 0, FLAC_MAGIC_SIZE);
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gst_pad_push (tag->srcpad, GST_DATA (sub));
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sub =
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gst_buffer_create_sub (tag->buffer, FLAC_MAGIC_SIZE,
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GST_BUFFER_SIZE (tag->buffer) - FLAC_MAGIC_SIZE);
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gst_buffer_unref (tag->buffer);
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/* We do a copy because we need a writable buffer, and _create_sub
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* sets the buffer it uses to read-only
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*/
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tag->buffer = gst_buffer_copy (sub);
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gst_buffer_unref (sub);
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} else {
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/* FIXME: does that work well with FLAC files containing ID3v2 tags ? */
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GST_ELEMENT_ERROR (tag, STREAM, WRONG_TYPE, (NULL), (NULL));
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}
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}
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/* The fLaC magic string has been skipped, try to detect the beginning
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* of a metadata block
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*/
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if (tag->state == GST_FLAC_TAG_STATE_METADATA_BLOCKS) {
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guint size;
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guint type;
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gboolean is_last;
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g_assert (tag->metadata_bytes_remaining == 0);
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g_assert (tag->metadata_last_block == FALSE);
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/* The header of a flac metadata block is 4 bytes long:
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* 1st bit: indicates whether this is the last metadata info block
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* 7 next bits: 4 if vorbis comment block
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* 24 next bits: size of the metadata to follow (big endian)
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*/
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if (GST_BUFFER_SIZE (tag->buffer) < 4) {
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return;
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}
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is_last = (((GST_BUFFER_DATA (tag->buffer)[0]) & 0x80) == 0x80);
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/* If we have metadata set on the element, the last metadata block
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* will be the vorbis comment block which we will build ourselves
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*/
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if (is_last) {
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(GST_BUFFER_DATA (tag->buffer)[0]) &= (~0x80);
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}
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type = (GST_BUFFER_DATA (tag->buffer)[0]) & 0x7F;
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size = ((GST_BUFFER_DATA (tag->buffer)[1]) << 16)
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| ((GST_BUFFER_DATA (tag->buffer)[2]) << 8)
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| (GST_BUFFER_DATA (tag->buffer)[3]);
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/* The 4 bytes long header isn't included in the metadata size */
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tag->metadata_bytes_remaining = size + 4;
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tag->metadata_last_block = is_last;
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/* Metadata blocks of type 4 are vorbis comment blocks */
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if (type == 0x04) {
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tag->state = GST_FLAC_TAG_STATE_VC_METADATA_BLOCK;
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} else {
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tag->state = GST_FLAC_TAG_STATE_WRITING_METADATA_BLOCK;
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}
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}
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/* Reads a metadata block */
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if ((tag->state == GST_FLAC_TAG_STATE_WRITING_METADATA_BLOCK) ||
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(tag->state == GST_FLAC_TAG_STATE_VC_METADATA_BLOCK)) {
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GstBuffer *sub;
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guint bytes_to_push;
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g_assert (tag->metadata_bytes_remaining != 0);
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bytes_to_push = min (tag->metadata_bytes_remaining,
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GST_BUFFER_SIZE (tag->buffer));
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sub = gst_buffer_create_sub (tag->buffer, 0, bytes_to_push);
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if (tag->state == GST_FLAC_TAG_STATE_WRITING_METADATA_BLOCK) {
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gst_pad_push (tag->srcpad, GST_DATA (sub));
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} else {
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if (tag->vorbiscomment == NULL) {
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tag->vorbiscomment = sub;
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} else {
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GstBuffer *merge;
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merge = gst_buffer_merge (tag->vorbiscomment, sub);
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gst_buffer_unref (tag->vorbiscomment);
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gst_buffer_unref (sub);
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tag->vorbiscomment = merge;
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}
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}
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tag->metadata_bytes_remaining -= (bytes_to_push);
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if (GST_BUFFER_SIZE (tag->buffer) > bytes_to_push) {
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GstBuffer *sub;
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sub = gst_buffer_create_sub (tag->buffer, bytes_to_push,
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GST_BUFFER_SIZE (tag->buffer) - bytes_to_push);
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gst_buffer_unref (tag->buffer);
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/* We make a copy because we need a writable buffer, and _create_sub
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* sets the buffer it uses to read-only
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*/
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tag->buffer = gst_buffer_copy (sub);
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gst_buffer_unref (sub);
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tag->state = GST_FLAC_TAG_STATE_METADATA_NEXT_BLOCK;
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} else if (tag->metadata_bytes_remaining == 0) {
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gst_buffer_unref (tag->buffer);
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tag->buffer = NULL;
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tag->state = GST_FLAC_TAG_STATE_METADATA_NEXT_BLOCK;
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tag->buffer = NULL;
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} else {
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tag->state = GST_FLAC_TAG_STATE_WRITING_METADATA_BLOCK;
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tag->buffer = NULL;
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}
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}
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/* This state is mainly used to be able to stop as soon as we read
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* a vorbiscomment block from the flac file if we are in an only output
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* tags mode
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*/
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if (tag->state == GST_FLAC_TAG_STATE_METADATA_NEXT_BLOCK) {
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/* Check if in the previous iteration we read a vorbis comment metadata
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* block, and stop now if the user only wants to read tags
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*/
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if (tag->vorbiscomment != NULL) {
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/* We found some tags, try to parse them and notify the other elements
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* that we encoutered some tags
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*/
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tag->tags = gst_tag_list_from_vorbiscomment_buffer (tag->vorbiscomment,
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GST_BUFFER_DATA (tag->vorbiscomment), 4, NULL);
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if (tag->tags != NULL) {
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gst_element_found_tags (GST_ELEMENT (tag), tag->tags);
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}
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gst_buffer_unref (tag->vorbiscomment);
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tag->vorbiscomment = NULL;
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if (tag->only_output_tags) {
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send_eos (tag);
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return;
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}
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}
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/* Skip to next state */
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if (tag->metadata_last_block == FALSE) {
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tag->state = GST_FLAC_TAG_STATE_METADATA_BLOCKS;
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} else {
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if (tag->only_output_tags) {
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/* If we finished parsing the metadata blocks, we will never find any
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* metadata, so just stop now
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*/
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send_eos (tag);
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return;
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} else {
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tag->state = GST_FLAC_TAG_STATE_ADD_VORBIS_COMMENT;
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}
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}
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}
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/* Creates a vorbis comment block from the metadata which was set
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* on the gstreamer element, and add it to the flac stream
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*/
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if (tag->state == GST_FLAC_TAG_STATE_ADD_VORBIS_COMMENT) {
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GstBuffer *buffer;
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gint size;
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const GstTagList *user_tags;
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GstTagList *merged_tags;
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g_assert (tag->only_output_tags == FALSE);
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user_tags = gst_tag_setter_get_tag_list (GST_TAG_SETTER (tag));
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merged_tags = gst_tag_list_merge (tag->tags, user_tags,
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gst_tag_setter_get_tag_merge_mode (GST_TAG_SETTER (tag)));
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if (merged_tags == NULL) {
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/* If we get a NULL list of tags, we must generate a padding block
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* which is marked as the last metadata block, otherwise we'll
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* end up with a corrupted flac file.
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*/
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g_warning ("No tags found\n");
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buffer = gst_buffer_new_and_alloc (12);
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if (buffer == NULL) {
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GST_ELEMENT_ERROR (tag, CORE, TOO_LAZY, (NULL),
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("Error creating 12-byte buffer for padding block"));
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}
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memset (GST_BUFFER_DATA (buffer), 0, GST_BUFFER_SIZE (buffer));
|
|
GST_BUFFER_DATA (buffer)[0] = 0x81; /* 0x80 = Last metadata block,
|
|
* 0x01 = padding block
|
|
*/
|
|
} else {
|
|
guchar header[4];
|
|
|
|
memset (header, 0, sizeof (header));
|
|
header[0] = 0x84; /* 0x80 = Last metadata block,
|
|
* 0x04 = vorbiscomment block
|
|
*/
|
|
buffer = gst_tag_list_to_vorbiscomment_buffer (merged_tags, header,
|
|
sizeof (header), NULL);
|
|
gst_tag_list_free (merged_tags);
|
|
if (buffer == NULL) {
|
|
GST_ELEMENT_ERROR (tag, CORE, TAG, (NULL),
|
|
("Error converting tag list to vorbiscomment buffer"));
|
|
return;
|
|
}
|
|
size = GST_BUFFER_SIZE (buffer) - 4;
|
|
if ((size > 0xFFFFFF) || (size < 0)) {
|
|
/* FLAC vorbis comment blocks are limited to 2^24 bytes,
|
|
* while the vorbis specs allow more than that. Shouldn't
|
|
* be a real world problem though
|
|
*/
|
|
GST_ELEMENT_ERROR (tag, CORE, TAG, (NULL),
|
|
("Vorbis comment of size %d too long", size));
|
|
return;
|
|
}
|
|
|
|
/* Get rid of the framing bit at the end of the vorbiscomment buffer
|
|
* if it exists since libFLAC seems to lose sync because of this
|
|
* bit in gstflacdec
|
|
*/
|
|
if (GST_BUFFER_DATA (buffer)[GST_BUFFER_SIZE (buffer) - 1] == 1) {
|
|
GstBuffer *sub;
|
|
|
|
sub = gst_buffer_create_sub (buffer, 0, GST_BUFFER_SIZE (buffer) - 1);
|
|
gst_buffer_unref (buffer);
|
|
buffer = sub;
|
|
}
|
|
}
|
|
|
|
/* The 4 byte metadata block header isn't accounted for in the total
|
|
* size of the metadata block
|
|
*/
|
|
size = GST_BUFFER_SIZE (buffer) - 4;
|
|
|
|
GST_BUFFER_DATA (buffer)[1] = ((size & 0xFF0000) >> 16);
|
|
GST_BUFFER_DATA (buffer)[2] = ((size & 0x00FF00) >> 8);
|
|
GST_BUFFER_DATA (buffer)[3] = (size & 0x0000FF);
|
|
gst_pad_push (tag->srcpad, GST_DATA (buffer));
|
|
tag->state = GST_FLAC_TAG_STATE_AUDIO_DATA;
|
|
}
|
|
|
|
|
|
/* The metadata blocks have been read, now we are reading audio data */
|
|
if (tag->state == GST_FLAC_TAG_STATE_AUDIO_DATA) {
|
|
gst_pad_push (tag->srcpad, GST_DATA (tag->buffer));
|
|
tag->buffer = NULL;
|
|
}
|
|
}
|
|
|
|
|
|
static GstStateChangeReturn
|
|
gst_flac_tag_change_state (GstElement * element, GstStateChange transition)
|
|
{
|
|
GstFlacTag *tag;
|
|
|
|
tag = GST_FLAC_TAG (element);
|
|
|
|
switch (transition) {
|
|
case GST_STATE_CHANGE_NULL_TO_READY:
|
|
break;
|
|
case GST_STATE_CHANGE_READY_TO_PAUSED:
|
|
break;
|
|
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
|
|
/* do something to get out of the chain function faster */
|
|
break;
|
|
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
|
|
break;
|
|
case GST_STATE_CHANGE_PAUSED_TO_READY:
|
|
if (tag->buffer) {
|
|
gst_buffer_unref (tag->buffer);
|
|
tag->buffer = NULL;
|
|
}
|
|
if (tag->vorbiscomment) {
|
|
gst_buffer_unref (tag->vorbiscomment);
|
|
tag->vorbiscomment = NULL;
|
|
}
|
|
if (tag->tags) {
|
|
gst_tag_list_free (tag->tags);
|
|
}
|
|
tag->state = GST_FLAC_TAG_STATE_INIT;
|
|
break;
|
|
case GST_STATE_CHANGE_READY_TO_NULL:
|
|
break;
|
|
}
|
|
|
|
return parent_class->change_state (element, transition);
|
|
}
|