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705 lines
20 KiB
C
705 lines
20 KiB
C
/* GStreamer
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* Copyright (C) 2006 Sjoerd Simons <sjoerd@luon.net>
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* Copyright (C) 2004 Wim Taymans <wim@fluendo.com>
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*
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* gstmultipartdemux.c: multipart stream demuxer
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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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/**
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* SECTION:element-multipartdemux
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* @see_also: #GstMultipartMux
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*
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* MultipartDemux uses the Content-type field of incoming buffers to demux and
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* push data to dynamic source pads. Most of the time multipart streams are
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* sequential JPEG frames generated from a live source such as a network source
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* or a camera.
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*
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* The output buffers of the multipartdemux typically have no timestamps and are
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* usually played as fast as possible (at the rate that the source provides the
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* data).
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*
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* the content in multipart files is separated with a boundary string that can
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* be configured specifically with the #GstMultipartDemux:boundary property
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* otherwise it will be autodetected.
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*
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* <refsect2>
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* <title>Sample pipelines</title>
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* |[
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* gst-launch filesrc location=/tmp/test.multipart ! multipartdemux ! jpegdec ! ffmpegcolorspace ! ximagesink
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* ]| a simple pipeline to demux a multipart file muxed with #GstMultipartMux
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* containing JPEG frames.
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* </refsect2>
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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 "multipartdemux.h"
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GST_DEBUG_CATEGORY_STATIC (gst_multipart_demux_debug);
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#define GST_CAT_DEFAULT gst_multipart_demux_debug
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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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#define DEFAULT_AUTOSCAN FALSE
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#define DEFAULT_BOUNDARY NULL
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enum
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{
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PROP_0,
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PROP_AUTOSCAN,
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PROP_BOUNDARY
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};
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static GstStaticPadTemplate multipart_demux_src_template_factory =
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GST_STATIC_PAD_TEMPLATE ("src_%d",
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GST_PAD_SRC,
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GST_PAD_SOMETIMES,
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GST_STATIC_CAPS_ANY);
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static GstStaticPadTemplate multipart_demux_sink_template_factory =
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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 ("multipart/x-mixed-replace")
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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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} GstNamesMap;
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/* convert from mime types to gst structure names. Add more when needed. The
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* mime-type is stored as lowercase */
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static const GstNamesMap gstnames[] = {
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/* RFC 2046 says audio/basic is mulaw, mono, 8000Hz */
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{"audio/basic", "audio/x-mulaw, channels=1, rate=8000"},
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{"audio/g726-16",
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"audio/x-adpcm, bitrate=16000, layout=g726, channels=1, rate=8000"},
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{"audio/g726-24",
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"audio/x-adpcm, bitrate=24000, layout=g726, channels=1, rate=8000"},
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{"audio/g726-32",
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"audio/x-adpcm, bitrate=32000, layout=g726, channels=1, rate=8000"},
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{"audio/g726-40",
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"audio/x-adpcm, bitrate=40000, layout=g726, channels=1, rate=8000"},
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/* Panasonic Network Cameras non-standard types */
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{"audio/g726",
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"audio/x-adpcm, bitrate=32000, layout=g726, channels=1, rate=8000"},
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{NULL, NULL}
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};
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static GstFlowReturn gst_multipart_demux_chain (GstPad * pad, GstBuffer * buf);
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static GstStateChangeReturn gst_multipart_demux_change_state (GstElement *
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element, GstStateChange transition);
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static void gst_multipart_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_multipart_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static void gst_multipart_demux_finalize (GObject * object);
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GST_BOILERPLATE (GstMultipartDemux, gst_multipart_demux, GstElement,
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GST_TYPE_ELEMENT);
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static void
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gst_multipart_demux_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_pad_template (element_class,
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gst_static_pad_template_get (&multipart_demux_sink_template_factory));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&multipart_demux_src_template_factory));
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gst_element_class_set_details_simple (element_class, "Multipart demuxer",
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"Codec/Demuxer",
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"demux multipart streams",
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"Wim Taymans <wim.taymans@gmail.com>, Sjoerd Simons <sjoerd@luon.net>");
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}
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static void
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gst_multipart_demux_class_init (GstMultipartDemuxClass * klass)
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{
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int i;
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
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gobject_class->finalize = gst_multipart_demux_finalize;
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gobject_class->set_property = gst_multipart_set_property;
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gobject_class->get_property = gst_multipart_get_property;
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g_object_class_install_property (gobject_class, PROP_BOUNDARY,
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g_param_spec_string ("boundary", "Boundary",
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"The boundary string separating data, automatic if NULL",
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DEFAULT_BOUNDARY,
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_AUTOSCAN,
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g_param_spec_boolean ("autoscan", "autoscan",
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"Try to autofind the prefix (deprecated unused, see boundary)",
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DEFAULT_AUTOSCAN, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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/* populate gst names and mime types pairs */
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klass->gstnames = g_hash_table_new (g_str_hash, g_str_equal);
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for (i = 0; gstnames[i].key; i++) {
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g_hash_table_insert (klass->gstnames, (gpointer) gstnames[i].key,
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(gpointer) gstnames[i].val);
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}
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gstelement_class->change_state = gst_multipart_demux_change_state;
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}
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static void
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gst_multipart_demux_init (GstMultipartDemux * multipart,
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GstMultipartDemuxClass * g_class)
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{
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/* create the sink pad */
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multipart->sinkpad =
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gst_pad_new_from_static_template (&multipart_demux_sink_template_factory,
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"sink");
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gst_element_add_pad (GST_ELEMENT_CAST (multipart), multipart->sinkpad);
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gst_pad_set_chain_function (multipart->sinkpad,
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GST_DEBUG_FUNCPTR (gst_multipart_demux_chain));
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multipart->adapter = gst_adapter_new ();
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multipart->boundary = DEFAULT_BOUNDARY;
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multipart->mime_type = NULL;
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multipart->content_length = -1;
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multipart->header_completed = FALSE;
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multipart->scanpos = 0;
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multipart->autoscan = DEFAULT_AUTOSCAN;
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}
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static void
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gst_multipart_pad_free (GstMultipartPad * mppad)
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{
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g_free (mppad->mime);
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g_free (mppad);
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}
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static void
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gst_multipart_demux_finalize (GObject * object)
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{
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GstMultipartDemux *demux = GST_MULTIPART_DEMUX (object);
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g_object_unref (demux->adapter);
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g_free (demux->boundary);
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g_free (demux->mime_type);
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g_slist_foreach (demux->srcpads, (GFunc) gst_multipart_pad_free, NULL);
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g_slist_free (demux->srcpads);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static const gchar *
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gst_multipart_demux_get_gstname (GstMultipartDemux * demux, gchar * mimetype)
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{
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GstMultipartDemuxClass *klass;
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const gchar *gstname;
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klass = GST_MULTIPART_DEMUX_GET_CLASS (demux);
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/* use hashtable to convert to gst name */
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gstname = g_hash_table_lookup (klass->gstnames, mimetype);
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if (gstname == NULL) {
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/* no gst name mapping, use mime type */
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gstname = mimetype;
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}
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GST_DEBUG_OBJECT (demux, "gst name for %s is %s", mimetype, gstname);
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return gstname;
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}
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static GstFlowReturn
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gst_multipart_combine_flows (GstMultipartDemux * demux, GstMultipartPad * pad,
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GstFlowReturn ret)
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{
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GSList *walk;
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/* store the value */
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pad->last_ret = ret;
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/* any other error that is not-linked can be returned right
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* away */
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if (ret != GST_FLOW_NOT_LINKED)
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goto done;
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/* only return NOT_LINKED if all other pads returned NOT_LINKED */
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for (walk = demux->srcpads; walk; walk = g_slist_next (walk)) {
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GstMultipartPad *opad = (GstMultipartPad *) walk->data;
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ret = opad->last_ret;
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/* some other return value (must be SUCCESS but we can return
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* other values as well) */
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if (ret != GST_FLOW_NOT_LINKED)
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goto done;
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}
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/* if we get here, all other pads were unlinked and we return
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* NOT_LINKED then */
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done:
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return ret;
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}
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static GstMultipartPad *
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gst_multipart_find_pad_by_mime (GstMultipartDemux * demux, gchar * mime,
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gboolean * created)
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{
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GSList *walk;
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walk = demux->srcpads;
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while (walk) {
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GstMultipartPad *pad = (GstMultipartPad *) walk->data;
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if (!strcmp (pad->mime, mime)) {
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if (created) {
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*created = FALSE;
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}
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return pad;
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}
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walk = walk->next;
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}
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/* pad not found, create it */
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{
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GstPad *pad;
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GstMultipartPad *mppad;
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gchar *name;
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const gchar *capsname;
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GstCaps *caps;
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mppad = g_new0 (GstMultipartPad, 1);
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GST_DEBUG_OBJECT (demux, "creating pad with mime: %s", mime);
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name = g_strdup_printf ("src_%d", demux->numpads);
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pad =
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gst_pad_new_from_static_template (&multipart_demux_src_template_factory,
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name);
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g_free (name);
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/* take the mime type, convert it to the caps name */
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capsname = gst_multipart_demux_get_gstname (demux, mime);
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caps = gst_caps_from_string (capsname);
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GST_DEBUG_OBJECT (demux, "caps for pad: %s", capsname);
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gst_pad_use_fixed_caps (pad);
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gst_pad_set_caps (pad, caps);
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gst_caps_unref (caps);
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mppad->pad = pad;
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mppad->mime = g_strdup (mime);
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mppad->last_ret = GST_FLOW_OK;
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demux->srcpads = g_slist_prepend (demux->srcpads, mppad);
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demux->numpads++;
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gst_pad_set_active (pad, TRUE);
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gst_element_add_pad (GST_ELEMENT_CAST (demux), pad);
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if (created) {
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*created = TRUE;
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}
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return mppad;
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}
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}
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static gboolean
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get_line_end (const guint8 * data, const guint8 * dataend, guint8 ** end,
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guint8 ** next)
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{
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guint8 *x;
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gboolean foundr = FALSE;
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for (x = (guint8 *) data; x < dataend; x++) {
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if (*x == '\r') {
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foundr = TRUE;
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} else if (*x == '\n') {
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*end = x - (foundr ? 1 : 0);
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*next = x + 1;
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return TRUE;
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}
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}
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return FALSE;
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}
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static guint
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get_mime_len (const guint8 * data, guint maxlen)
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{
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guint8 *x;
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x = (guint8 *) data;
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while (*x != '\0' && *x != '\r' && *x != '\n' && *x != ';') {
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x++;
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}
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return x - data;
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}
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static gint
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multipart_parse_header (GstMultipartDemux * multipart)
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{
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const guint8 *data;
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const guint8 *dataend;
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gchar *boundary;
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int boundary_len;
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int datalen;
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guint8 *pos;
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guint8 *end, *next;
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datalen = gst_adapter_available (multipart->adapter);
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data = gst_adapter_peek (multipart->adapter, datalen);
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dataend = data + datalen;
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/* Skip leading whitespace, pos endposition should at least leave space for
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* the boundary and a \n */
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for (pos = (guint8 *) data; pos < dataend - 4 && g_ascii_isspace (*pos);
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pos++);
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if (pos >= dataend - 4) {
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return MULTIPART_NEED_MORE_DATA;
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}
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if (G_UNLIKELY (pos[0] != '-' || pos[1] != '-')) {
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GST_DEBUG_OBJECT (multipart, "No boundary available");
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goto wrong_header;
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}
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/* First the boundary */
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if (!get_line_end (pos, dataend, &end, &next))
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return MULTIPART_NEED_MORE_DATA;
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/* Ignore the leading -- */
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boundary_len = end - pos - 2;
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boundary = (gchar *) pos + 2;
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if (boundary_len < 1) {
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GST_DEBUG_OBJECT (multipart, "No boundary available");
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goto wrong_header;
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}
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if (G_UNLIKELY (multipart->boundary == NULL)) {
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/* First time we see the boundary, copy it */
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multipart->boundary = g_strndup (boundary, boundary_len);
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multipart->boundary_len = boundary_len;
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} else if (G_UNLIKELY (boundary_len != multipart->boundary_len)) {
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/* Something odd is going on, either the boundary indicated EOS or it's
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* invalid */
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if (G_UNLIKELY (boundary_len == multipart->boundary_len + 2 &&
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!strncmp (boundary, multipart->boundary, multipart->boundary_len) &&
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!strncmp (boundary + multipart->boundary_len, "--", 2))) {
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return MULTIPART_DATA_EOS;
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}
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GST_DEBUG_OBJECT (multipart,
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"Boundary length doesn't match detected boundary (%d <> %d",
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boundary_len, multipart->boundary_len);
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goto wrong_header;
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} else if (G_UNLIKELY (strncmp (boundary, multipart->boundary, boundary_len))) {
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GST_DEBUG_OBJECT (multipart, "Boundary doesn't match previous boundary");
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goto wrong_header;
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}
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pos = next;
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while (get_line_end (pos, dataend, &end, &next)) {
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guint len = end - pos;
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if (len == 0) {
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/* empty line, data starts behind us */
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GST_DEBUG_OBJECT (multipart,
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"Parsed the header - boundary: %s, mime-type: %s, content-length: %d",
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multipart->boundary, multipart->mime_type, multipart->content_length);
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return next - data;
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}
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if (len >= 14 && !g_ascii_strncasecmp ("content-type:", (gchar *) pos, 13)) {
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guint mime_len;
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/* only take the mime type up to the first ; if any. After ; there can be
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* properties that we don't handle yet. */
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mime_len = get_mime_len (pos + 14, len - 14);
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g_free (multipart->mime_type);
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multipart->mime_type = g_ascii_strdown ((gchar *) pos + 14, mime_len);
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} else if (len >= 15 &&
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!g_ascii_strncasecmp ("content-length:", (gchar *) pos, 15)) {
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multipart->content_length =
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g_ascii_strtoull ((gchar *) pos + 15, NULL, 10);
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}
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pos = next;
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}
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GST_DEBUG_OBJECT (multipart, "Need more data for the header");
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return MULTIPART_NEED_MORE_DATA;
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wrong_header:
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{
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GST_ELEMENT_ERROR (multipart, STREAM, DEMUX, (NULL),
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("Boundary not found in the multipart header"));
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return MULTIPART_DATA_ERROR;
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}
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}
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static gint
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multipart_find_boundary (GstMultipartDemux * multipart, gint * datalen)
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{
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/* Adaptor is positioned at the start of the data */
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const guint8 *data, *pos;
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const guint8 *dataend;
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gint len;
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if (multipart->content_length >= 0) {
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/* fast path, known content length :) */
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len = multipart->content_length;
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if (gst_adapter_available (multipart->adapter) >= len + 2) {
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*datalen = len;
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data = gst_adapter_peek (multipart->adapter, len + 1);
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/* If data[len] contains \r then assume a newline is \r\n */
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if (data[len] == '\r')
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len += 2;
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else if (data[len] == '\n')
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len += 1;
|
|
/* Don't check if boundary is actually there, but let the header parsing
|
|
* bail out if it isn't */
|
|
return len;
|
|
} else {
|
|
/* need more data */
|
|
return MULTIPART_NEED_MORE_DATA;
|
|
}
|
|
}
|
|
|
|
len = gst_adapter_available (multipart->adapter);
|
|
if (len == 0)
|
|
return MULTIPART_NEED_MORE_DATA;
|
|
data = gst_adapter_peek (multipart->adapter, len);
|
|
dataend = data + len;
|
|
|
|
for (pos = data + multipart->scanpos;
|
|
pos <= dataend - multipart->boundary_len - 2; pos++) {
|
|
if (*pos == '-' && pos[1] == '-' &&
|
|
!strncmp ((gchar *) pos + 2,
|
|
multipart->boundary, multipart->boundary_len)) {
|
|
/* Found the boundary! Check if there was a newline before the boundary */
|
|
len = pos - data;
|
|
if (pos - 2 > data && pos[-2] == '\r')
|
|
len -= 2;
|
|
else if (pos - 1 > data && pos[-1] == '\n')
|
|
len -= 1;
|
|
*datalen = len;
|
|
|
|
multipart->scanpos = 0;
|
|
return pos - data;
|
|
}
|
|
}
|
|
multipart->scanpos = pos - data;
|
|
return MULTIPART_NEED_MORE_DATA;
|
|
}
|
|
|
|
static GstFlowReturn
|
|
gst_multipart_demux_chain (GstPad * pad, GstBuffer * buf)
|
|
{
|
|
GstMultipartDemux *multipart;
|
|
GstAdapter *adapter;
|
|
GstClockTime timestamp;
|
|
gint size = 1;
|
|
GstFlowReturn res;
|
|
|
|
multipart = GST_MULTIPART_DEMUX (gst_pad_get_parent (pad));
|
|
adapter = multipart->adapter;
|
|
|
|
res = GST_FLOW_OK;
|
|
|
|
timestamp = GST_BUFFER_TIMESTAMP (buf);
|
|
|
|
if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DISCONT)) {
|
|
gst_adapter_clear (adapter);
|
|
}
|
|
gst_adapter_push (adapter, buf);
|
|
|
|
while (gst_adapter_available (adapter) > 0) {
|
|
GstMultipartPad *srcpad;
|
|
GstBuffer *outbuf;
|
|
gboolean created;
|
|
gint datalen;
|
|
|
|
if (G_UNLIKELY (!multipart->header_completed)) {
|
|
if ((size = multipart_parse_header (multipart)) < 0) {
|
|
goto nodata;
|
|
} else {
|
|
gst_adapter_flush (adapter, size);
|
|
multipart->header_completed = TRUE;
|
|
}
|
|
}
|
|
if ((size = multipart_find_boundary (multipart, &datalen)) < 0) {
|
|
goto nodata;
|
|
}
|
|
|
|
/* Invalidate header info */
|
|
multipart->header_completed = FALSE;
|
|
multipart->content_length = -1;
|
|
|
|
if (G_UNLIKELY (datalen <= 0)) {
|
|
GST_DEBUG_OBJECT (multipart, "skipping empty content.");
|
|
gst_adapter_flush (adapter, size - datalen);
|
|
} else {
|
|
srcpad =
|
|
gst_multipart_find_pad_by_mime (multipart,
|
|
multipart->mime_type, &created);
|
|
outbuf = gst_adapter_take_buffer (adapter, datalen);
|
|
gst_adapter_flush (adapter, size - datalen);
|
|
|
|
gst_buffer_set_caps (outbuf, GST_PAD_CAPS (srcpad->pad));
|
|
if (created) {
|
|
GstTagList *tags;
|
|
|
|
/* Push new segment, first buffer has 0 timestamp */
|
|
gst_pad_push_event (srcpad->pad,
|
|
gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME, 0, -1, 0));
|
|
|
|
tags =
|
|
gst_tag_list_new_full (GST_TAG_CONTAINER_FORMAT, "Multipart", NULL);
|
|
gst_pad_push_event (srcpad->pad, gst_event_new_tag (tags));
|
|
|
|
GST_BUFFER_TIMESTAMP (outbuf) = 0;
|
|
} else {
|
|
GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
|
|
}
|
|
GST_DEBUG_OBJECT (multipart,
|
|
"pushing buffer with timestamp %" GST_TIME_FORMAT,
|
|
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (outbuf)));
|
|
GST_DEBUG_OBJECT (multipart, "buffer has caps %" GST_PTR_FORMAT,
|
|
GST_BUFFER_CAPS (outbuf));
|
|
res = gst_pad_push (srcpad->pad, outbuf);
|
|
res = gst_multipart_combine_flows (multipart, srcpad, res);
|
|
if (res != GST_FLOW_OK)
|
|
break;
|
|
}
|
|
}
|
|
|
|
nodata:
|
|
gst_object_unref (multipart);
|
|
|
|
if (G_UNLIKELY (size == MULTIPART_DATA_ERROR))
|
|
return GST_FLOW_ERROR;
|
|
if (G_UNLIKELY (size == MULTIPART_DATA_EOS))
|
|
return GST_FLOW_UNEXPECTED;
|
|
|
|
return res;
|
|
}
|
|
|
|
static GstStateChangeReturn
|
|
gst_multipart_demux_change_state (GstElement * element,
|
|
GstStateChange transition)
|
|
{
|
|
GstMultipartDemux *multipart;
|
|
GstStateChangeReturn ret;
|
|
|
|
multipart = GST_MULTIPART_DEMUX (element);
|
|
|
|
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
|
|
if (ret == GST_STATE_CHANGE_FAILURE)
|
|
return ret;
|
|
|
|
switch (transition) {
|
|
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
|
|
break;
|
|
case GST_STATE_CHANGE_PAUSED_TO_READY:
|
|
multipart->header_completed = FALSE;
|
|
g_free (multipart->boundary);
|
|
multipart->boundary = NULL;
|
|
g_free (multipart->mime_type);
|
|
multipart->mime_type = NULL;
|
|
gst_adapter_clear (multipart->adapter);
|
|
break;
|
|
case GST_STATE_CHANGE_READY_TO_NULL:
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
static void
|
|
gst_multipart_set_property (GObject * object, guint prop_id,
|
|
const GValue * value, GParamSpec * pspec)
|
|
{
|
|
GstMultipartDemux *filter;
|
|
|
|
g_return_if_fail (GST_IS_MULTIPART_DEMUX (object));
|
|
filter = GST_MULTIPART_DEMUX (object);
|
|
|
|
switch (prop_id) {
|
|
case PROP_BOUNDARY:
|
|
/* Not really that usefull anymore as we can reliably autoscan */
|
|
g_free (filter->boundary);
|
|
filter->boundary = g_value_dup_string (value);
|
|
if (filter->boundary != NULL) {
|
|
filter->boundary_len = strlen (filter->boundary);
|
|
}
|
|
break;
|
|
case PROP_AUTOSCAN:
|
|
filter->autoscan = g_value_get_boolean (value);
|
|
break;
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_multipart_get_property (GObject * object, guint prop_id,
|
|
GValue * value, GParamSpec * pspec)
|
|
{
|
|
GstMultipartDemux *filter;
|
|
|
|
g_return_if_fail (GST_IS_MULTIPART_DEMUX (object));
|
|
filter = GST_MULTIPART_DEMUX (object);
|
|
|
|
switch (prop_id) {
|
|
case PROP_BOUNDARY:
|
|
g_value_set_string (value, filter->boundary);
|
|
break;
|
|
case PROP_AUTOSCAN:
|
|
g_value_set_boolean (value, filter->autoscan);
|
|
break;
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
gboolean
|
|
gst_multipart_demux_plugin_init (GstPlugin * plugin)
|
|
{
|
|
GST_DEBUG_CATEGORY_INIT (gst_multipart_demux_debug,
|
|
"multipartdemux", 0, "multipart demuxer");
|
|
|
|
return gst_element_register (plugin, "multipartdemux", GST_RANK_PRIMARY,
|
|
GST_TYPE_MULTIPART_DEMUX);
|
|
}
|