690 lines
20 KiB
C
690 lines
20 KiB
C
/* multipart muxer plugin for GStreamer
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* Copyright (C) 2004 Wim Taymans <wim@fluendo.com>
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:element-multipartmux
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* @title: multipartmux
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*
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* MultipartMux uses the #GstCaps of the sink pad as the Content-type field for
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* incoming buffers when muxing them to a multipart stream. Most of the time
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* multipart streams are sequential JPEG frames.
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*
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* ## Sample pipelines
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* |[
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* gst-launch-1.0 videotestsrc ! video/x-raw, framerate='(fraction)'5/1 ! jpegenc ! multipartmux ! filesink location=/tmp/test.multipart
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* ]| a pipeline to mux 5 JPEG frames per second into a multipart stream
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* stored to a file.
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*
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*/
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/* FIXME: drop/merge tag events, or at least send them delayed after stream-start */
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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 "multipartmux.h"
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GST_DEBUG_CATEGORY_STATIC (gst_multipart_mux_debug);
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#define GST_CAT_DEFAULT gst_multipart_mux_debug
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#define DEFAULT_BOUNDARY "ThisRandomString"
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enum
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{
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PROP_0,
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PROP_BOUNDARY
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/* FILL ME */
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};
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static GstStaticPadTemplate src_factory = 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 ("multipart/x-mixed-replace")
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);
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static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink_%u",
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GST_PAD_SINK,
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GST_PAD_REQUEST,
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GST_STATIC_CAPS_ANY /* we can take anything, really */
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);
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typedef struct
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{
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const gchar *key;
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const gchar *val;
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} MimeTypeMap;
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/* convert from gst structure names to mime types. Add more when needed. */
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static const MimeTypeMap mimetypes[] = {
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{"audio/x-mulaw", "audio/basic"},
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{NULL, NULL}
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};
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static void gst_multipart_mux_finalize (GObject * object);
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static gboolean gst_multipart_mux_handle_src_event (GstPad * pad,
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GstObject * parent, GstEvent * event);
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static GstPad *gst_multipart_mux_request_new_pad (GstElement * element,
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GstPadTemplate * templ, const gchar * name, const GstCaps * caps);
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static GstStateChangeReturn gst_multipart_mux_change_state (GstElement *
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element, GstStateChange transition);
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static gboolean gst_multipart_mux_sink_event (GstCollectPads * pads,
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GstCollectData * pad, GstEvent * event, GstMultipartMux * mux);
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static GstFlowReturn gst_multipart_mux_collected (GstCollectPads * pads,
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GstMultipartMux * mux);
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static void gst_multipart_mux_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_multipart_mux_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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#define gst_multipart_mux_parent_class parent_class
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G_DEFINE_TYPE (GstMultipartMux, gst_multipart_mux, GST_TYPE_ELEMENT);
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GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (multipartmux, "multipartmux",
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GST_RANK_NONE, GST_TYPE_MULTIPART_MUX,
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GST_DEBUG_CATEGORY_INIT (gst_multipart_mux_debug, "multipartmux", 0,
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"multipart muxer"));
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static void
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gst_multipart_mux_class_init (GstMultipartMuxClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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gint i;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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parent_class = g_type_class_peek_parent (klass);
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gobject_class->finalize = gst_multipart_mux_finalize;
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gobject_class->get_property = gst_multipart_mux_get_property;
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gobject_class->set_property = gst_multipart_mux_set_property;
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g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_BOUNDARY,
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g_param_spec_string ("boundary", "Boundary", "Boundary string",
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DEFAULT_BOUNDARY, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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gstelement_class->request_new_pad = gst_multipart_mux_request_new_pad;
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gstelement_class->change_state = gst_multipart_mux_change_state;
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gst_element_class_add_static_pad_template (gstelement_class, &src_factory);
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gst_element_class_add_static_pad_template (gstelement_class, &sink_factory);
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gst_element_class_set_static_metadata (gstelement_class, "Multipart muxer",
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"Codec/Muxer", "mux multipart streams", "Wim Taymans <wim@fluendo.com>");
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/* populate mime types */
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klass->mimetypes = g_hash_table_new (g_str_hash, g_str_equal);
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for (i = 0; mimetypes[i].key; i++) {
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g_hash_table_insert (klass->mimetypes, (gpointer) mimetypes[i].key,
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(gpointer) mimetypes[i].val);
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}
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}
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static void
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gst_multipart_mux_init (GstMultipartMux * multipart_mux)
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{
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GstElementClass *klass = GST_ELEMENT_GET_CLASS (multipart_mux);
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multipart_mux->srcpad =
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gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
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"src"), "src");
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gst_pad_set_event_function (multipart_mux->srcpad,
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gst_multipart_mux_handle_src_event);
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gst_element_add_pad (GST_ELEMENT (multipart_mux), multipart_mux->srcpad);
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multipart_mux->boundary = g_strdup (DEFAULT_BOUNDARY);
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multipart_mux->collect = gst_collect_pads_new ();
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gst_collect_pads_set_event_function (multipart_mux->collect,
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(GstCollectPadsEventFunction)
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GST_DEBUG_FUNCPTR (gst_multipart_mux_sink_event), multipart_mux);
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gst_collect_pads_set_function (multipart_mux->collect,
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(GstCollectPadsFunction) GST_DEBUG_FUNCPTR (gst_multipart_mux_collected),
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multipart_mux);
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}
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static void
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gst_multipart_mux_finalize (GObject * object)
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{
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GstMultipartMux *multipart_mux;
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multipart_mux = GST_MULTIPART_MUX (object);
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g_free (multipart_mux->boundary);
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if (multipart_mux->collect)
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gst_object_unref (multipart_mux->collect);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static GstPad *
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gst_multipart_mux_request_new_pad (GstElement * element,
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GstPadTemplate * templ, const gchar * req_name, const GstCaps * caps)
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{
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GstMultipartMux *multipart_mux;
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GstPad *newpad;
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GstElementClass *klass = GST_ELEMENT_GET_CLASS (element);
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gchar *name;
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if (templ != gst_element_class_get_pad_template (klass, "sink_%u"))
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goto wrong_template;
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multipart_mux = GST_MULTIPART_MUX (element);
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/* create new pad with the name */
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name = g_strdup_printf ("sink_%u", multipart_mux->numpads);
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newpad = gst_pad_new_from_template (templ, name);
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g_free (name);
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/* construct our own wrapper data structure for the pad to
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* keep track of its status */
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{
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GstMultipartPadData *multipartpad;
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multipartpad = (GstMultipartPadData *)
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gst_collect_pads_add_pad (multipart_mux->collect, newpad,
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sizeof (GstMultipartPadData), NULL, TRUE);
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/* save a pointer to our data in the pad */
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multipartpad->pad = newpad;
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gst_pad_set_element_private (newpad, multipartpad);
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multipart_mux->numpads++;
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}
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/* add the pad to the element */
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gst_element_add_pad (element, newpad);
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return newpad;
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/* ERRORS */
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wrong_template:
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{
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g_warning ("multipart_mux: this is not our template!");
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return NULL;
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}
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}
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/* handle events */
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static gboolean
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gst_multipart_mux_handle_src_event (GstPad * pad, GstObject * parent,
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GstEvent * event)
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{
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GstEventType type;
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type = event ? GST_EVENT_TYPE (event) : GST_EVENT_UNKNOWN;
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switch (type) {
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case GST_EVENT_SEEK:
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/* disable seeking for now */
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return FALSE;
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default:
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break;
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}
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return gst_pad_event_default (pad, parent, event);
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}
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static const gchar *
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gst_multipart_mux_get_mime (GstMultipartMux * mux, GstStructure * s)
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{
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GstMultipartMuxClass *klass;
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const gchar *mime;
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const gchar *name;
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gint rate;
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gint channels;
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gint bitrate = 0;
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klass = GST_MULTIPART_MUX_GET_CLASS (mux);
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name = gst_structure_get_name (s);
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/* use hashtable to convert to mime type */
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mime = g_hash_table_lookup (klass->mimetypes, name);
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if (mime == NULL) {
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if (!strcmp (name, "audio/x-adpcm"))
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gst_structure_get_int (s, "bitrate", &bitrate);
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switch (bitrate) {
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case 16000:
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mime = "audio/G726-16";
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break;
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case 24000:
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mime = "audio/G726-24";
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break;
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case 32000:
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mime = "audio/G726-32";
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break;
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case 40000:
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mime = "audio/G726-40";
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break;
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default:
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/* no mime type mapping, use name */
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mime = name;
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break;
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}
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}
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/* RFC2046 requires audio/basic to be mulaw 8000Hz mono */
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if (g_ascii_strcasecmp (mime, "audio/basic") == 0) {
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if (gst_structure_get_int (s, "rate", &rate) &&
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gst_structure_get_int (s, "channels", &channels)) {
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if (rate != 8000 || channels != 1) {
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mime = name;
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}
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} else {
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mime = name;
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}
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}
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return mime;
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}
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/*
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* Given two pads, compare the buffers queued on it and return 0 if they have
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* an equal priority, 1 if the new pad is better, -1 if the old pad is better
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*/
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static gint
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gst_multipart_mux_compare_pads (GstMultipartMux * multipart_mux,
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GstMultipartPadData * old, GstMultipartPadData * new)
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{
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guint64 oldtime, newtime;
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/* if the old pad doesn't contain anything or is even NULL, return
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* the new pad as best candidate and vice versa */
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if (old == NULL || old->buffer == NULL)
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return 1;
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if (new == NULL || new->buffer == NULL)
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return -1;
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if (GST_CLOCK_TIME_IS_VALID (old->dts_timestamp) &&
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GST_CLOCK_TIME_IS_VALID (new->dts_timestamp)) {
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oldtime = old->dts_timestamp;
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newtime = new->dts_timestamp;
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} else {
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oldtime = old->pts_timestamp;
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newtime = new->pts_timestamp;
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}
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/* no timestamp on old buffer, it must go first */
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if (oldtime == GST_CLOCK_TIME_NONE)
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return -1;
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/* no timestamp on new buffer, it must go first */
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if (newtime == GST_CLOCK_TIME_NONE)
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return 1;
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/* old buffer has higher timestamp, new one should go first */
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if (newtime < oldtime)
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return 1;
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/* new buffer has higher timestamp, old one should go first */
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else if (newtime > oldtime)
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return -1;
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/* same priority if all of the above failed */
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return 0;
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}
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/* make sure a buffer is queued on all pads, returns a pointer to an multipartpad
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* that holds the best buffer or NULL when no pad was usable */
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static GstMultipartPadData *
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gst_multipart_mux_queue_pads (GstMultipartMux * mux)
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{
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GSList *walk = NULL;
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GstMultipartPadData *bestpad = NULL;
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g_return_val_if_fail (GST_IS_MULTIPART_MUX (mux), NULL);
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/* try to make sure we have a buffer from each usable pad first */
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walk = mux->collect->data;
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while (walk) {
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GstCollectData *data = (GstCollectData *) walk->data;
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GstMultipartPadData *pad = (GstMultipartPadData *) data;
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walk = g_slist_next (walk);
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/* try to get a new buffer for this pad if needed and possible */
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if (pad->buffer == NULL) {
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GstBuffer *buf = NULL;
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buf = gst_collect_pads_pop (mux->collect, data);
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/* Store timestamps with segment_start and preroll */
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if (buf && GST_BUFFER_PTS_IS_VALID (buf)) {
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pad->pts_timestamp =
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gst_segment_to_running_time (&data->segment, GST_FORMAT_TIME,
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GST_BUFFER_PTS (buf));
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} else {
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pad->pts_timestamp = GST_CLOCK_TIME_NONE;
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}
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if (buf && GST_BUFFER_DTS_IS_VALID (buf)) {
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pad->dts_timestamp =
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gst_segment_to_running_time (&data->segment, GST_FORMAT_TIME,
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GST_BUFFER_DTS (buf));
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} else {
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pad->dts_timestamp = GST_CLOCK_TIME_NONE;
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}
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pad->buffer = buf;
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}
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/* we should have a buffer now, see if it is the best stream to
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* pull on */
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if (pad->buffer != NULL) {
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if (gst_multipart_mux_compare_pads (mux, bestpad, pad) > 0) {
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bestpad = pad;
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}
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}
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}
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return bestpad;
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}
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static gboolean
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gst_multipart_mux_sink_event (GstCollectPads * pads, GstCollectData * data,
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GstEvent * event, GstMultipartMux * mux)
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{
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gboolean ret;
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_FLUSH_STOP:
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{
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mux->need_segment = 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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ret = gst_collect_pads_event_default (pads, data, event, FALSE);
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return ret;
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}
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/* basic idea:
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*
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* 1) find a pad to pull on, this is done by pulling on all pads and
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* looking at the buffers to decide which one should be muxed first.
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* 2) create a new buffer for the header
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* 3) push both buffers on best pad, go to 1
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*/
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static GstFlowReturn
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gst_multipart_mux_collected (GstCollectPads * pads, GstMultipartMux * mux)
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{
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GstMultipartPadData *best;
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GstFlowReturn ret = GST_FLOW_OK;
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gchar *header = NULL;
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size_t headerlen;
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GstBuffer *headerbuf = NULL;
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GstBuffer *footerbuf = NULL;
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GstBuffer *databuf = NULL;
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GstStructure *structure = NULL;
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GstCaps *caps;
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const gchar *mime;
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GST_DEBUG_OBJECT (mux, "all pads are collected");
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if (mux->need_stream_start) {
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gchar s_id[32];
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/* stream-start (FIXME: create id based on input ids) */
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g_snprintf (s_id, sizeof (s_id), "multipartmux-%08x", g_random_int ());
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gst_pad_push_event (mux->srcpad, gst_event_new_stream_start (s_id));
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mux->need_stream_start = FALSE;
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}
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/* queue buffers on all pads; find a buffer with the lowest timestamp */
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best = gst_multipart_mux_queue_pads (mux);
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if (!best)
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/* EOS */
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goto eos;
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else if (!best->buffer)
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goto buffer_error;
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/* If not negotiated yet set caps on src pad */
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if (!mux->negotiated) {
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GstCaps *newcaps;
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newcaps = gst_caps_new_simple ("multipart/x-mixed-replace",
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"boundary", G_TYPE_STRING, mux->boundary, NULL);
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if (!gst_pad_set_caps (mux->srcpad, newcaps)) {
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gst_caps_unref (newcaps);
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goto nego_error;
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}
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gst_caps_unref (newcaps);
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mux->negotiated = TRUE;
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}
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/* see if we need to push a segment */
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if (mux->need_segment) {
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GstClockTime time;
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GstSegment segment;
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if (best->dts_timestamp != GST_CLOCK_TIME_NONE) {
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time = best->dts_timestamp;
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} else if (best->pts_timestamp != GST_CLOCK_TIME_NONE) {
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time = best->pts_timestamp;
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} else {
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time = 0;
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}
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/* for the segment, we take the first timestamp we see, we don't know the
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* length and the position is 0 */
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gst_segment_init (&segment, GST_FORMAT_TIME);
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segment.start = time;
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gst_pad_push_event (mux->srcpad, gst_event_new_segment (&segment));
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|
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mux->need_segment = FALSE;
|
|
}
|
|
|
|
caps = gst_pad_get_current_caps (best->pad);
|
|
if (caps == NULL)
|
|
goto no_caps;
|
|
|
|
structure = gst_caps_get_structure (caps, 0);
|
|
if (!structure) {
|
|
gst_caps_unref (caps);
|
|
goto no_caps;
|
|
}
|
|
|
|
/* get the mime type for the structure */
|
|
mime = gst_multipart_mux_get_mime (mux, structure);
|
|
gst_caps_unref (caps);
|
|
|
|
header = g_strdup_printf ("--%s\r\nContent-Type: %s\r\n"
|
|
"Content-Length: %" G_GSIZE_FORMAT "\r\n\r\n",
|
|
mux->boundary, mime, gst_buffer_get_size (best->buffer));
|
|
headerlen = strlen (header);
|
|
|
|
headerbuf = gst_buffer_new_allocate (NULL, headerlen, NULL);
|
|
gst_buffer_fill (headerbuf, 0, header, headerlen);
|
|
g_free (header);
|
|
|
|
/* the header has the same timestamps as the data buffer (which we will push
|
|
* below) and has a duration of 0 */
|
|
GST_BUFFER_PTS (headerbuf) = best->pts_timestamp;
|
|
GST_BUFFER_DTS (headerbuf) = best->dts_timestamp;
|
|
GST_BUFFER_DURATION (headerbuf) = 0;
|
|
GST_BUFFER_OFFSET (headerbuf) = mux->offset;
|
|
mux->offset += headerlen;
|
|
GST_BUFFER_OFFSET_END (headerbuf) = mux->offset;
|
|
|
|
GST_DEBUG_OBJECT (mux, "pushing %" G_GSIZE_FORMAT " bytes header buffer",
|
|
headerlen);
|
|
ret = gst_pad_push (mux->srcpad, headerbuf);
|
|
if (ret != GST_FLOW_OK)
|
|
/* push always takes ownership of the buffer, even after an error, so we
|
|
* don't need to unref headerbuf here. */
|
|
goto beach;
|
|
|
|
/* take best->buffer, we don't need to unref it later as we will push it
|
|
* now. */
|
|
databuf = gst_buffer_make_writable (best->buffer);
|
|
best->buffer = NULL;
|
|
|
|
/* we need to updated the timestamps to match the running_time */
|
|
GST_BUFFER_PTS (databuf) = best->pts_timestamp;
|
|
GST_BUFFER_DTS (databuf) = best->dts_timestamp;
|
|
GST_BUFFER_OFFSET (databuf) = mux->offset;
|
|
mux->offset += gst_buffer_get_size (databuf);
|
|
GST_BUFFER_OFFSET_END (databuf) = mux->offset;
|
|
GST_BUFFER_FLAG_SET (databuf, GST_BUFFER_FLAG_DELTA_UNIT);
|
|
|
|
GST_DEBUG_OBJECT (mux, "pushing %" G_GSIZE_FORMAT " bytes data buffer",
|
|
gst_buffer_get_size (databuf));
|
|
ret = gst_pad_push (mux->srcpad, databuf);
|
|
if (ret != GST_FLOW_OK)
|
|
/* push always takes ownership of the buffer, even after an error, so we
|
|
* don't need to unref headerbuf here. */
|
|
goto beach;
|
|
|
|
footerbuf = gst_buffer_new_allocate (NULL, 2, NULL);
|
|
gst_buffer_fill (footerbuf, 0, "\r\n", 2);
|
|
|
|
/* the footer has the same timestamps as the data buffer and has a
|
|
* duration of 0 */
|
|
GST_BUFFER_PTS (footerbuf) = best->pts_timestamp;
|
|
GST_BUFFER_DTS (footerbuf) = best->dts_timestamp;
|
|
GST_BUFFER_DURATION (footerbuf) = 0;
|
|
GST_BUFFER_OFFSET (footerbuf) = mux->offset;
|
|
mux->offset += 2;
|
|
GST_BUFFER_OFFSET_END (footerbuf) = mux->offset;
|
|
GST_BUFFER_FLAG_SET (footerbuf, GST_BUFFER_FLAG_DELTA_UNIT);
|
|
|
|
GST_DEBUG_OBJECT (mux, "pushing 2 bytes footer buffer");
|
|
ret = gst_pad_push (mux->srcpad, footerbuf);
|
|
|
|
beach:
|
|
if (best && best->buffer) {
|
|
gst_buffer_unref (best->buffer);
|
|
best->buffer = NULL;
|
|
}
|
|
return ret;
|
|
|
|
/* ERRORS */
|
|
buffer_error:
|
|
{
|
|
/* There is a best but no buffer, this is not quite right.. */
|
|
GST_ELEMENT_ERROR (mux, STREAM, FAILED, (NULL), ("internal muxing error"));
|
|
ret = GST_FLOW_ERROR;
|
|
goto beach;
|
|
}
|
|
eos:
|
|
{
|
|
GST_DEBUG_OBJECT (mux, "Pushing EOS");
|
|
gst_pad_push_event (mux->srcpad, gst_event_new_eos ());
|
|
ret = GST_FLOW_EOS;
|
|
goto beach;
|
|
}
|
|
nego_error:
|
|
{
|
|
GST_WARNING_OBJECT (mux, "failed to set caps");
|
|
GST_ELEMENT_ERROR (mux, CORE, NEGOTIATION, (NULL), (NULL));
|
|
ret = GST_FLOW_NOT_NEGOTIATED;
|
|
goto beach;
|
|
}
|
|
no_caps:
|
|
{
|
|
GST_WARNING_OBJECT (mux, "no caps on the incoming buffer %p", best->buffer);
|
|
GST_ELEMENT_ERROR (mux, CORE, NEGOTIATION, (NULL), (NULL));
|
|
ret = GST_FLOW_NOT_NEGOTIATED;
|
|
goto beach;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_multipart_mux_get_property (GObject * object,
|
|
guint prop_id, GValue * value, GParamSpec * pspec)
|
|
{
|
|
GstMultipartMux *mux;
|
|
|
|
mux = GST_MULTIPART_MUX (object);
|
|
|
|
switch (prop_id) {
|
|
case PROP_BOUNDARY:
|
|
g_value_set_string (value, mux->boundary);
|
|
break;
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_multipart_mux_set_property (GObject * object,
|
|
guint prop_id, const GValue * value, GParamSpec * pspec)
|
|
{
|
|
GstMultipartMux *mux;
|
|
|
|
mux = GST_MULTIPART_MUX (object);
|
|
|
|
switch (prop_id) {
|
|
case PROP_BOUNDARY:
|
|
g_free (mux->boundary);
|
|
mux->boundary = g_value_dup_string (value);
|
|
break;
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static GstStateChangeReturn
|
|
gst_multipart_mux_change_state (GstElement * element, GstStateChange transition)
|
|
{
|
|
GstMultipartMux *multipart_mux;
|
|
GstStateChangeReturn ret;
|
|
|
|
multipart_mux = GST_MULTIPART_MUX (element);
|
|
|
|
switch (transition) {
|
|
case GST_STATE_CHANGE_READY_TO_PAUSED:
|
|
multipart_mux->offset = 0;
|
|
multipart_mux->negotiated = FALSE;
|
|
multipart_mux->need_segment = TRUE;
|
|
multipart_mux->need_stream_start = TRUE;
|
|
GST_DEBUG_OBJECT (multipart_mux, "starting collect pads");
|
|
gst_collect_pads_start (multipart_mux->collect);
|
|
break;
|
|
case GST_STATE_CHANGE_PAUSED_TO_READY:
|
|
GST_DEBUG_OBJECT (multipart_mux, "stopping collect pads");
|
|
gst_collect_pads_stop (multipart_mux->collect);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
|
|
if (ret == GST_STATE_CHANGE_FAILURE)
|
|
return ret;
|
|
|
|
switch (transition) {
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|