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402 lines
12 KiB
C
402 lines
12 KiB
C
/* GStreamer taglib-based muxer base class
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* Copyright (C) 2006 Christophe Fergeau <teuf@gnome.org>
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* Copyright (C) 2006 Tim-Philipp Müller <tim centricular net>
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* Copyright (C) 2006 Sebastian Dröge <slomo@circular-chaos.org>
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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 <string.h>
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#include <gst/gsttagsetter.h>
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#include <gst/tag/tag.h>
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#include "gsttaglibmux.h"
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GST_DEBUG_CATEGORY_STATIC (gst_tag_lib_mux_debug);
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#define GST_CAT_DEFAULT gst_tag_lib_mux_debug
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static GstStaticPadTemplate gst_tag_lib_mux_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 ("ANY"));
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static void
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gst_tag_lib_mux_iface_init (GType taglib_type)
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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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g_type_add_interface_static (taglib_type, GST_TYPE_TAG_SETTER,
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&tag_setter_info);
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}
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GST_BOILERPLATE_FULL (GstTagLibMux, gst_tag_lib_mux,
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GstElement, GST_TYPE_ELEMENT, gst_tag_lib_mux_iface_init);
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static GstStateChangeReturn
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gst_tag_lib_mux_change_state (GstElement * element, GstStateChange transition);
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static GstFlowReturn gst_tag_lib_mux_chain (GstPad * pad, GstBuffer * buffer);
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static gboolean gst_tag_lib_mux_sink_event (GstPad * pad, GstEvent * event);
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static void
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gst_tag_lib_mux_finalize (GObject * obj)
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{
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GstTagLibMux *mux = GST_TAG_LIB_MUX (obj);
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if (mux->newsegment_ev) {
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gst_event_unref (mux->newsegment_ev);
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mux->newsegment_ev = NULL;
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}
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if (mux->event_tags) {
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gst_tag_list_free (mux->event_tags);
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mux->event_tags = NULL;
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}
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G_OBJECT_CLASS (parent_class)->finalize (obj);
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}
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static void
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gst_tag_lib_mux_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_add_static_pad_template (element_class,
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&gst_tag_lib_mux_sink_template);
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GST_DEBUG_CATEGORY_INIT (gst_tag_lib_mux_debug, "taglibmux", 0,
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"taglib-based muxer");
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}
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static void
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gst_tag_lib_mux_class_init (GstTagLibMuxClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gobject_class->finalize = gst_tag_lib_mux_finalize;
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gstelement_class->change_state =
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GST_DEBUG_FUNCPTR (gst_tag_lib_mux_change_state);
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}
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static void
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gst_tag_lib_mux_init (GstTagLibMux * mux, GstTagLibMuxClass * mux_class)
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{
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GstElementClass *element_klass = GST_ELEMENT_CLASS (mux_class);
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GstPadTemplate *tmpl;
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/* pad through which data comes in to the element */
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mux->sinkpad =
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gst_pad_new_from_static_template (&gst_tag_lib_mux_sink_template, "sink");
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gst_pad_set_chain_function (mux->sinkpad,
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GST_DEBUG_FUNCPTR (gst_tag_lib_mux_chain));
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gst_pad_set_event_function (mux->sinkpad,
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GST_DEBUG_FUNCPTR (gst_tag_lib_mux_sink_event));
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gst_element_add_pad (GST_ELEMENT (mux), mux->sinkpad);
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/* pad through which data goes out of the element */
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tmpl = gst_element_class_get_pad_template (element_klass, "src");
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if (tmpl) {
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mux->srcpad = gst_pad_new_from_template (tmpl, "src");
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gst_pad_use_fixed_caps (mux->srcpad);
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gst_pad_set_caps (mux->srcpad, gst_pad_template_get_caps (tmpl));
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gst_element_add_pad (GST_ELEMENT (mux), mux->srcpad);
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}
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mux->render_tag = TRUE;
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}
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static GstBuffer *
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gst_tag_lib_mux_render_tag (GstTagLibMux * mux)
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{
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GstTagLibMuxClass *klass;
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GstTagMergeMode merge_mode;
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GstTagSetter *tagsetter;
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GstBuffer *buffer;
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const GstTagList *tagsetter_tags;
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GstTagList *taglist;
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GstEvent *event;
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tagsetter = GST_TAG_SETTER (mux);
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tagsetter_tags = gst_tag_setter_get_tag_list (tagsetter);
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merge_mode = gst_tag_setter_get_tag_merge_mode (tagsetter);
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GST_LOG_OBJECT (mux, "merging tags, merge mode = %d", merge_mode);
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GST_LOG_OBJECT (mux, "event tags: %" GST_PTR_FORMAT, mux->event_tags);
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GST_LOG_OBJECT (mux, "set tags: %" GST_PTR_FORMAT, tagsetter_tags);
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taglist = gst_tag_list_merge (tagsetter_tags, mux->event_tags, merge_mode);
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GST_LOG_OBJECT (mux, "final tags: %" GST_PTR_FORMAT, taglist);
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klass = GST_TAG_LIB_MUX_CLASS (G_OBJECT_GET_CLASS (mux));
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if (klass->render_tag == NULL)
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goto no_vfunc;
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buffer = klass->render_tag (mux, taglist);
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if (buffer == NULL)
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goto render_error;
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mux->tag_size = GST_BUFFER_SIZE (buffer);
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GST_LOG_OBJECT (mux, "tag size = %" G_GSIZE_FORMAT " bytes", mux->tag_size);
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/* Send newsegment event from byte position 0, so the tag really gets
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* written to the start of the file, independent of the upstream segment */
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gst_pad_push_event (mux->srcpad,
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gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_BYTES, 0, -1, 0));
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/* Send an event about the new tags to downstream elements */
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/* gst_event_new_tag takes ownership of the list, so no need to unref it */
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event = gst_event_new_tag (taglist);
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gst_pad_push_event (mux->srcpad, event);
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GST_BUFFER_OFFSET (buffer) = 0;
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return buffer;
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no_vfunc:
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{
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GST_ERROR_OBJECT (mux, "Subclass does not implement render_tag vfunc!");
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gst_tag_list_free (taglist);
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return NULL;
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}
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render_error:
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{
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GST_ERROR_OBJECT (mux, "Failed to render tag");
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gst_tag_list_free (taglist);
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return NULL;
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}
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}
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static GstEvent *
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gst_tag_lib_mux_adjust_event_offsets (GstTagLibMux * mux,
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const GstEvent * newsegment_event)
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{
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GstFormat format;
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gint64 start, stop, cur;
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gst_event_parse_new_segment ((GstEvent *) newsegment_event, NULL, NULL,
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&format, &start, &stop, &cur);
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g_assert (format == GST_FORMAT_BYTES);
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if (start != -1)
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start += mux->tag_size;
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if (stop != -1)
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stop += mux->tag_size;
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if (cur != -1)
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cur += mux->tag_size;
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GST_DEBUG_OBJECT (mux, "adjusting newsegment event offsets to start=%"
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G_GINT64_FORMAT ", stop=%" G_GINT64_FORMAT ", cur=%" G_GINT64_FORMAT
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" (delta = +%" G_GSIZE_FORMAT ")", start, stop, cur, mux->tag_size);
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return gst_event_new_new_segment (TRUE, 1.0, format, start, stop, cur);
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}
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static GstFlowReturn
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gst_tag_lib_mux_chain (GstPad * pad, GstBuffer * buffer)
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{
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GstTagLibMux *mux = GST_TAG_LIB_MUX (GST_OBJECT_PARENT (pad));
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if (mux->render_tag) {
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GstFlowReturn ret;
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GstBuffer *tag_buffer;
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GST_INFO_OBJECT (mux, "Adding tags to stream");
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tag_buffer = gst_tag_lib_mux_render_tag (mux);
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if (tag_buffer == NULL)
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goto no_tag_buffer;
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ret = gst_pad_push (mux->srcpad, tag_buffer);
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if (ret != GST_FLOW_OK) {
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GST_DEBUG_OBJECT (mux, "flow: %s", gst_flow_get_name (ret));
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gst_buffer_unref (buffer);
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return ret;
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}
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/* Now send the cached newsegment event that we got from upstream */
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if (mux->newsegment_ev) {
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GST_DEBUG_OBJECT (mux, "sending cached newsegment event");
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gst_pad_push_event (mux->srcpad,
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gst_tag_lib_mux_adjust_event_offsets (mux, mux->newsegment_ev));
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gst_event_unref (mux->newsegment_ev);
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mux->newsegment_ev = NULL;
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} else {
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/* upstream sent no newsegment event or only one in a non-BYTE format */
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}
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mux->render_tag = FALSE;
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}
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buffer = gst_buffer_make_metadata_writable (buffer);
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if (GST_BUFFER_OFFSET (buffer) != GST_BUFFER_OFFSET_NONE) {
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GST_LOG_OBJECT (mux, "Adjusting buffer offset from %" G_GINT64_FORMAT
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" to %" G_GINT64_FORMAT, GST_BUFFER_OFFSET (buffer),
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GST_BUFFER_OFFSET (buffer) + mux->tag_size);
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GST_BUFFER_OFFSET (buffer) += mux->tag_size;
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}
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gst_buffer_set_caps (buffer, GST_PAD_CAPS (mux->srcpad));
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return gst_pad_push (mux->srcpad, buffer);
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/* ERRORS */
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no_tag_buffer:
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{
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GST_ELEMENT_ERROR (mux, LIBRARY, ENCODE, (NULL), (NULL));
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return GST_FLOW_ERROR;
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}
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}
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static gboolean
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gst_tag_lib_mux_sink_event (GstPad * pad, GstEvent * event)
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{
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GstTagLibMux *mux;
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gboolean result;
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mux = GST_TAG_LIB_MUX (gst_pad_get_parent (pad));
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result = FALSE;
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_TAG:{
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GstTagList *tags;
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gst_event_parse_tag (event, &tags);
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GST_INFO_OBJECT (mux, "Got tag event: %" GST_PTR_FORMAT, tags);
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if (mux->event_tags != NULL) {
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gst_tag_list_insert (mux->event_tags, tags, GST_TAG_MERGE_REPLACE);
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} else {
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mux->event_tags = gst_tag_list_copy (tags);
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}
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GST_INFO_OBJECT (mux, "Event tags are now: %" GST_PTR_FORMAT,
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mux->event_tags);
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/* just drop the event, we'll push a new tag event in render_tag */
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gst_event_unref (event);
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result = TRUE;
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break;
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}
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case GST_EVENT_NEWSEGMENT:{
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GstFormat fmt;
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gst_event_parse_new_segment (event, NULL, NULL, &fmt, NULL, NULL, NULL);
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if (fmt != GST_FORMAT_BYTES) {
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GST_WARNING_OBJECT (mux, "dropping newsegment event in %s format",
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gst_format_get_name (fmt));
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gst_event_unref (event);
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break;
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}
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if (mux->render_tag) {
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/* we have not rendered the tag yet, which means that we don't know
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* how large it is going to be yet, so we can't adjust the offsets
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* here at this point and need to cache the newsegment event for now
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* (also, there could be tag events coming after this newsegment event
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* and before the first buffer). */
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if (mux->newsegment_ev) {
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GST_WARNING_OBJECT (mux, "discarding old cached newsegment event");
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gst_event_unref (mux->newsegment_ev);
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}
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GST_LOG_OBJECT (mux, "caching newsegment event for later");
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mux->newsegment_ev = event;
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} else {
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GST_DEBUG_OBJECT (mux, "got newsegment event, adjusting offsets");
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gst_pad_push_event (mux->srcpad,
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gst_tag_lib_mux_adjust_event_offsets (mux, event));
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gst_event_unref (event);
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}
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event = NULL;
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result = TRUE;
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break;
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}
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default:
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result = gst_pad_event_default (pad, event);
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break;
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}
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gst_object_unref (mux);
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return result;
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}
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static GstStateChangeReturn
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gst_tag_lib_mux_change_state (GstElement * element, GstStateChange transition)
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{
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GstTagLibMux *mux;
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GstStateChangeReturn result;
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mux = GST_TAG_LIB_MUX (element);
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result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
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if (result != GST_STATE_CHANGE_SUCCESS) {
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return result;
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}
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switch (transition) {
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case GST_STATE_CHANGE_PAUSED_TO_READY:{
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if (mux->newsegment_ev) {
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gst_event_unref (mux->newsegment_ev);
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mux->newsegment_ev = NULL;
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}
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if (mux->event_tags) {
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gst_tag_list_free (mux->event_tags);
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mux->event_tags = NULL;
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}
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mux->tag_size = 0;
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mux->render_tag = TRUE;
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break;
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}
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default:
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break;
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}
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return result;
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}
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static gboolean
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plugin_init (GstPlugin * plugin)
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{
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return (gst_id3v2_mux_plugin_init (plugin)
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&& gst_apev2_mux_plugin_init (plugin));
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}
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GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
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GST_VERSION_MINOR,
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"taglib",
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"Tag writing plug-in based on taglib",
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plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN);
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