gstreamer/gst/multipart/multipartdemux.c
Sjoerd Simons 52c986d876 gst/multipart/multipartdemux.c: Accept leading whitespace before the boundary
Original commit message from CVS:
Patch by: Sjoerd Simons <sjoerd at luon dot net>
* gst/multipart/multipartdemux.c: (multipart_parse_header):
Accept leading whitespace before the boundary
This patch makes the demuxer allow some whitespace before the actual
boundary. This makes the demuxer work with the ``old'' gstreamer
multipartmuxer again (which placed an extra \n before the start
of the stream) Fixes #349068.
2006-08-17 15:51:50 +00:00

631 lines
18 KiB
C

/* GStreamer
* Copyright (C) 2006 Sjoerd Simons <sjoerd@luon.net>
* Copyright (C) 2004 Wim Taymans <wim@fluendo.com>
*
* gstmultipartdemux.c: multipart stream demuxer
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:element-multipartdemux
* @short_description: Demuxer that takes a multipart digital stream as input
* and demuxes one or many digital streams from it.
* @see_also: #GstMultipartMux
*
* <refsect2>
* <para>
* MultipartDemux uses the Content-type field of incoming buffers to demux and
* push data to dynamic source pads. Most of the time multipart streams are
* sequential JPEG frames generated from a live source such as a network source
* or a camera.
* </para>
* <title>Sample pipelines</title>
* <para>
* Here is a simple pipeline to demux a multipart file muxed with
* #GstMultipartMux containing JPEG frames at a rate of 5 frames per second :
* <programlisting>
* gst-launch filesrc location=/tmp/test.multipart ! multipartdemux ! jpegdec ! video/x-raw-yuv, framerate=(fraction)5/1 ! ffmpegcolorspace ! ximagesink
* </programlisting>
* </para>
* <para>
* The output buffers of the multipartdemux typically have no timestamps and are usually
* played as fast as possible (at the rate that the source provides the data).
* </para>
* <para>
* the content in multipart files is separated with a boundary string that can be
* configured specifically with the "boundary" property otherwise it will be
* autodetected.
* </para>
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/base/gstadapter.h>
#include <string.h>
#define GST_TYPE_MULTIPART_DEMUX (gst_multipart_demux_get_type())
#define GST_MULTIPART_DEMUX(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_MULTIPART_DEMUX, GstMultipartDemux))
#define GST_MULTIPART_DEMUX_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_MULTIPART_DEMUX, GstMultipartDemux))
#define GST_IS_MULTIPART_DEMUX(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_MULTIPART_DEMUX))
#define GST_IS_MULTIPART_DEMUX_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_MULTIPART_DEMUX))
typedef struct _GstMultipartDemux GstMultipartDemux;
typedef struct _GstMultipartDemuxClass GstMultipartDemuxClass;
#define MULTIPART_NEED_MORE_DATA -1
#define MULTIPART_DATA_ERROR -2
#define MULTIPART_DATA_EOS -3
/* all information needed for one multipart stream */
typedef struct
{
GstPad *pad; /* reference for this pad is held by element we belong to */
gchar *mime;
}
GstMultipartPad;
/**
* GstMultipartDemux:
*
* The opaque #GstMultipartDemux structure.
*/
struct _GstMultipartDemux
{
GstElement element;
/* pad */
GstPad *sinkpad;
GSList *srcpads;
gint numpads;
GstAdapter *adapter;
/* Header information of the current frame */
gboolean header_completed;
gchar *boundary;
guint boundary_len;
gchar *mime_type;
gint content_length;
/* deprecated, unused */
gboolean autoscan;
/* Index inside the current data when manually looking for the boundary */
gint scanpos;
};
struct _GstMultipartDemuxClass
{
GstElementClass parent_class;
};
GST_DEBUG_CATEGORY_STATIC (gst_multipart_demux_debug);
#define GST_CAT_DEFAULT gst_multipart_demux_debug
/* elementfactory information */
static const GstElementDetails gst_multipart_demux_details =
GST_ELEMENT_DETAILS ("Multipart demuxer",
"Codec/Demuxer",
"demux multipart streams",
"Wim Taymans <wim@fluendo.com>, Sjoerd Simons <sjoerd@luon.net>");
/* signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
#define DEFAULT_AUTOSCAN FALSE
#define DEFAULT_BOUNDARY NULL
enum
{
PROP_0,
PROP_AUTOSCAN,
PROP_BOUNDARY
};
static GstStaticPadTemplate multipart_demux_src_template_factory =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate multipart_demux_sink_template_factory =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("multipart/x-mixed-replace")
);
static GstFlowReturn gst_multipart_demux_chain (GstPad * pad, GstBuffer * buf);
static GstStateChangeReturn gst_multipart_demux_change_state (GstElement *
element, GstStateChange transition);
static void gst_multipart_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_multipart_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_multipart_demux_finalize (GObject * object);
GST_BOILERPLATE (GstMultipartDemux, gst_multipart_demux, GstElement,
GST_TYPE_ELEMENT);
static void
gst_multipart_demux_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&multipart_demux_sink_template_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&multipart_demux_src_template_factory));
gst_element_class_set_details (element_class, &gst_multipart_demux_details);
}
static void
gst_multipart_demux_class_init (GstMultipartDemuxClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
gobject_class->finalize = gst_multipart_demux_finalize;
gobject_class->set_property = gst_multipart_set_property;
gobject_class->get_property = gst_multipart_get_property;
g_object_class_install_property (gobject_class, PROP_BOUNDARY,
g_param_spec_string ("boundary", "Boundary",
"The boundary string separating data, automatic if NULL",
DEFAULT_BOUNDARY, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
g_object_class_install_property (gobject_class, PROP_AUTOSCAN,
g_param_spec_boolean ("autoscan", "autoscan",
"Try to autofind the prefix (deprecated unused, see boundary)",
DEFAULT_AUTOSCAN, G_PARAM_READWRITE));
gstelement_class->change_state = gst_multipart_demux_change_state;
}
static void
gst_multipart_demux_init (GstMultipartDemux * multipart,
GstMultipartDemuxClass * g_class)
{
/* create the sink pad */
multipart->sinkpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&multipart_demux_sink_template_factory), "sink");
gst_element_add_pad (GST_ELEMENT (multipart), multipart->sinkpad);
gst_pad_set_chain_function (multipart->sinkpad,
GST_DEBUG_FUNCPTR (gst_multipart_demux_chain));
multipart->adapter = gst_adapter_new ();
multipart->boundary = DEFAULT_BOUNDARY;
multipart->mime_type = NULL;
multipart->content_length = -1;
multipart->header_completed = FALSE;
multipart->scanpos = 0;
multipart->autoscan = DEFAULT_AUTOSCAN;
}
static void
gst_multipart_demux_finalize (GObject * object)
{
GstMultipartDemux *demux = GST_MULTIPART_DEMUX (object);
g_object_unref (demux->adapter);
g_free (demux->boundary);
g_free (demux->mime_type);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static GstMultipartPad *
gst_multipart_find_pad_by_mime (GstMultipartDemux * demux, gchar * mime,
gboolean * created)
{
GSList *walk;
walk = demux->srcpads;
while (walk) {
GstMultipartPad *pad = (GstMultipartPad *) walk->data;
if (!strcmp (pad->mime, mime)) {
if (created) {
*created = FALSE;
}
return pad;
}
walk = walk->next;
}
/* pad not found, create it */
{
GstPad *pad;
GstMultipartPad *mppad;
gchar *name;
GstCaps *caps;
mppad = g_new0 (GstMultipartPad, 1);
GST_DEBUG_OBJECT (demux, "creating pad with mime: %s", mime);
name = g_strdup_printf ("src_%d", demux->numpads);
pad = gst_pad_new_from_template (gst_static_pad_template_get
(&multipart_demux_src_template_factory), name);
g_free (name);
caps = gst_caps_from_string (mime);
gst_pad_use_fixed_caps (pad);
gst_pad_set_caps (pad, caps);
mppad->pad = pad;
mppad->mime = g_strdup (mime);
demux->srcpads = g_slist_prepend (demux->srcpads, mppad);
demux->numpads++;
gst_element_add_pad (GST_ELEMENT (demux), pad);
if (created) {
*created = TRUE;
}
return mppad;
}
}
static gboolean
get_line_end (const guint8 * data, const guint8 * dataend, guint8 ** end,
guint8 ** next)
{
guint8 *x;
gboolean foundr = FALSE;
for (x = (guint8 *) data; x < dataend; x++) {
if (*x == '\r') {
foundr = TRUE;
} else if (*x == '\n') {
*end = x - (foundr ? 1 : 0);
*next = x + 1;
return TRUE;
}
}
return FALSE;
}
static gint
multipart_parse_header (GstMultipartDemux * multipart)
{
const guint8 *data;
const guint8 *dataend;
gchar *boundary;
int boundary_len;
int datalen;
guint8 *pos;
guint8 *end, *next;
datalen = gst_adapter_available (multipart->adapter);
data = gst_adapter_peek (multipart->adapter, datalen);
dataend = data + datalen;
/* Skip leading whitespace, pos endposition should at least leave space for
* the boundary and a \n */
for (pos = (guint8 *) data; pos < dataend - 4 && g_ascii_isspace (*pos);
pos++);
if (pos >= dataend - 4) {
return MULTIPART_NEED_MORE_DATA;
}
if (G_UNLIKELY (pos[0] != '-' || pos[1] != '-')) {
GST_DEBUG_OBJECT (multipart, "No boundary available");
goto wrong_header;
}
/* First the boundary */
if (!get_line_end (pos, dataend, &end, &next))
return MULTIPART_NEED_MORE_DATA;
/* Ignore the leading -- */
boundary_len = end - pos - 2;
boundary = (gchar *) pos + 2;
if (boundary_len < 1) {
GST_DEBUG_OBJECT (multipart, "No boundary available");
goto wrong_header;
}
if (G_UNLIKELY (multipart->boundary == NULL)) {
/* First time we see the boundary, copy it */
multipart->boundary = g_strndup (boundary, boundary_len);
multipart->boundary_len = boundary_len;
} else if (G_UNLIKELY (boundary_len != multipart->boundary_len)) {
/* Something odd is going on, either the boundary indicated EOS or it's
* invalid */
if (G_UNLIKELY (boundary_len == multipart->boundary_len + 2 &&
!strncmp (boundary, multipart->boundary, multipart->boundary_len) &&
!strncmp (boundary + multipart->boundary_len, "--", 2))) {
return MULTIPART_DATA_EOS;
}
GST_DEBUG_OBJECT (multipart,
"Boundary length doesn't match detected boundary (%d <> %d",
boundary_len, multipart->boundary_len);
goto wrong_header;
} else if (G_UNLIKELY (strncmp (boundary, multipart->boundary, boundary_len))) {
GST_DEBUG_OBJECT (multipart, "Boundary doesn't match previous boundary");
goto wrong_header;
}
pos = next;
while (get_line_end (pos, dataend, &end, &next)) {
guint len = end - pos;
if (len == 0) {
/* empty line, data starts behind us */
GST_DEBUG_OBJECT (multipart,
"Parsed the header - boundary: %s, mime-type: %s, content-length: %d",
multipart->boundary, multipart->mime_type, multipart->content_length);
return next - data;
}
if (len >= 14 && !g_ascii_strncasecmp ("content-type:", (gchar *) pos, 13)) {
g_free (multipart->mime_type);
multipart->mime_type = g_strndup ((gchar *) pos + 14, len - 14);
} else if (len >= 15 &&
!g_ascii_strncasecmp ("content-length:", (gchar *) pos, 15)) {
multipart->content_length =
g_ascii_strtoull ((gchar *) pos + 15, NULL, 10);
}
pos = next;
}
GST_DEBUG_OBJECT (multipart, "Need more data for the header");
return MULTIPART_NEED_MORE_DATA;
wrong_header:
{
GST_ELEMENT_ERROR (multipart, STREAM, DEMUX, (NULL),
("Boundary not found in the multipart header"));
return MULTIPART_DATA_ERROR;
}
}
static gint
multipart_find_boundary (GstMultipartDemux * multipart, gint * datalen)
{
/* Adaptor is positioned at the start of the data */
const guint8 *data, *pos;
const guint8 *dataend;
gint len;
if (multipart->content_length >= 0) {
/* fast path, known content length :) */
len = multipart->content_length;
if (gst_adapter_available (multipart->adapter) >= len + 2) {
*datalen = len;
data = gst_adapter_peek (multipart->adapter, len + 1);
/* If data[len] contains \r then assume a newline is \r\n */
if (data[len] == '\r')
len += 2;
else if (data[len] == '\n')
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;
gint size = 1;
multipart = GST_MULTIPART_DEMUX (gst_pad_get_parent (pad));
adapter = multipart->adapter;
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;
}
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);
/* Invalidate header info */
multipart->header_completed = FALSE;
multipart->content_length = -1;
gst_buffer_set_caps (outbuf, GST_PAD_CAPS (srcpad->pad));
if (created) {
GstEvent *event;
/* Push new segment, first buffer has 0 timestamp */
event = gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME, 0, -1, 0);
gst_pad_push_event (srcpad->pad, event);
GST_BUFFER_TIMESTAMP (outbuf) = 0;
} else {
GST_BUFFER_TIMESTAMP (outbuf) = -1;
}
gst_pad_push (srcpad->pad, outbuf);
}
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 GST_FLOW_OK;
}
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);
}