gstreamer/gst/multipart/multipartmux.c
2011-11-17 15:02:55 +01:00

638 lines
18 KiB
C

/* multipart muxer plugin for GStreamer
* Copyright (C) 2004 Wim Taymans <wim@fluendo.com>
*
* 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-multipartmux
*
* MultipartMux uses the #GstCaps of the sink pad as the Content-type field for
* incoming buffers when muxing them to a multipart stream. Most of the time
* multipart streams are sequential JPEG frames.
*
* <refsect2>
* <title>Sample pipelines</title>
* |[
* gst-launch videotestsrc ! video/x-raw-yuv, framerate='(fraction)'5/1 ! jpegenc ! multipartmux ! filesink location=/tmp/test.multipart
* ]| a pipeline to mux 5 JPEG frames per second into a multipart stream
* stored to a file.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "multipartmux.h"
GST_DEBUG_CATEGORY_STATIC (gst_multipart_mux_debug);
#define GST_CAT_DEFAULT gst_multipart_mux_debug
#define DEFAULT_BOUNDARY "ThisRandomString"
enum
{
ARG_0,
ARG_BOUNDARY
/* FILL ME */
};
static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("multipart/x-mixed-replace")
);
static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink_%u",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS_ANY /* we can take anything, really */
);
typedef struct
{
const gchar *key;
const gchar *val;
} MimeTypeMap;
/* convert from gst structure names to mime types. Add more when needed. */
static const MimeTypeMap mimetypes[] = {
{"audio/x-mulaw", "audio/basic"},
{NULL, NULL}
};
static void gst_multipart_mux_finalize (GObject * object);
static gboolean gst_multipart_mux_handle_src_event (GstPad * pad,
GstObject * parent, GstEvent * event);
static GstPad *gst_multipart_mux_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * name, const GstCaps * caps);
static GstStateChangeReturn gst_multipart_mux_change_state (GstElement *
element, GstStateChange transition);
static GstFlowReturn gst_multipart_mux_collected (GstCollectPads * pads,
GstMultipartMux * mux);
static void gst_multipart_mux_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_multipart_mux_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
#define gst_multipart_mux_parent_class parent_class
G_DEFINE_TYPE (GstMultipartMux, gst_multipart_mux, GST_TYPE_ELEMENT);
static void
gst_multipart_mux_class_init (GstMultipartMuxClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gint i;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_peek_parent (klass);
gobject_class->finalize = gst_multipart_mux_finalize;
gobject_class->get_property = gst_multipart_mux_get_property;
gobject_class->set_property = gst_multipart_mux_set_property;
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BOUNDARY,
g_param_spec_string ("boundary", "Boundary", "Boundary string",
DEFAULT_BOUNDARY, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gstelement_class->request_new_pad = gst_multipart_mux_request_new_pad;
gstelement_class->change_state = gst_multipart_mux_change_state;
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&src_factory));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&sink_factory));
gst_element_class_set_details_simple (gstelement_class, "Multipart muxer",
"Codec/Muxer", "mux multipart streams", "Wim Taymans <wim@fluendo.com>");
/* populate mime types */
klass->mimetypes = g_hash_table_new (g_str_hash, g_str_equal);
for (i = 0; mimetypes[i].key; i++) {
g_hash_table_insert (klass->mimetypes, (gpointer) mimetypes[i].key,
(gpointer) mimetypes[i].val);
}
}
static void
gst_multipart_mux_init (GstMultipartMux * multipart_mux)
{
GstElementClass *klass = GST_ELEMENT_GET_CLASS (multipart_mux);
multipart_mux->srcpad =
gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
"src"), "src");
gst_pad_set_event_function (multipart_mux->srcpad,
gst_multipart_mux_handle_src_event);
gst_element_add_pad (GST_ELEMENT (multipart_mux), multipart_mux->srcpad);
multipart_mux->boundary = g_strdup (DEFAULT_BOUNDARY);
multipart_mux->collect = gst_collect_pads_new ();
gst_collect_pads_set_function (multipart_mux->collect,
(GstCollectPadsFunction) GST_DEBUG_FUNCPTR (gst_multipart_mux_collected),
multipart_mux);
}
static void
gst_multipart_mux_finalize (GObject * object)
{
GstMultipartMux *multipart_mux;
multipart_mux = GST_MULTIPART_MUX (object);
g_free (multipart_mux->boundary);
if (multipart_mux->collect)
gst_object_unref (multipart_mux->collect);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static GstPad *
gst_multipart_mux_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * req_name, const GstCaps * caps)
{
GstMultipartMux *multipart_mux;
GstPad *newpad;
GstElementClass *klass = GST_ELEMENT_GET_CLASS (element);
gchar *name;
if (templ != gst_element_class_get_pad_template (klass, "sink_%u"))
goto wrong_template;
multipart_mux = GST_MULTIPART_MUX (element);
/* create new pad with the name */
name = g_strdup_printf ("sink_%u", multipart_mux->numpads);
newpad = gst_pad_new_from_template (templ, name);
g_free (name);
/* construct our own wrapper data structure for the pad to
* keep track of its status */
{
GstMultipartPadData *multipartpad;
multipartpad = (GstMultipartPadData *)
gst_collect_pads_add_pad (multipart_mux->collect, newpad,
sizeof (GstMultipartPadData), NULL);
/* save a pointer to our data in the pad */
multipartpad->pad = newpad;
gst_pad_set_element_private (newpad, multipartpad);
multipart_mux->numpads++;
}
/* add the pad to the element */
gst_element_add_pad (element, newpad);
return newpad;
/* ERRORS */
wrong_template:
{
g_warning ("multipart_mux: this is not our template!");
return NULL;
}
}
/* handle events */
static gboolean
gst_multipart_mux_handle_src_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
GstEventType type;
type = event ? GST_EVENT_TYPE (event) : GST_EVENT_UNKNOWN;
switch (type) {
case GST_EVENT_SEEK:
/* disable seeking for now */
return FALSE;
default:
break;
}
return gst_pad_event_default (pad, parent, event);
}
static const gchar *
gst_multipart_mux_get_mime (GstMultipartMux * mux, GstStructure * s)
{
GstMultipartMuxClass *klass;
const gchar *mime;
const gchar *name;
gint rate;
gint channels;
gint bitrate = 0;
klass = GST_MULTIPART_MUX_GET_CLASS (mux);
name = gst_structure_get_name (s);
/* use hashtable to convert to mime type */
mime = g_hash_table_lookup (klass->mimetypes, name);
if (mime == NULL) {
if (!strcmp (name, "audio/x-adpcm"))
gst_structure_get_int (s, "bitrate", &bitrate);
switch (bitrate) {
case 16000:
mime = "audio/G726-16";
break;
case 24000:
mime = "audio/G726-24";
break;
case 32000:
mime = "audio/G726-32";
break;
case 40000:
mime = "audio/G726-40";
break;
default:
/* no mime type mapping, use name */
mime = name;
break;
}
}
/* RFC2046 requires audio/basic to be mulaw 8000Hz mono */
if (g_ascii_strcasecmp (mime, "audio/basic") == 0) {
if (gst_structure_get_int (s, "rate", &rate) &&
gst_structure_get_int (s, "channels", &channels)) {
if (rate != 8000 || channels != 1) {
mime = name;
}
} else {
mime = name;
}
}
return mime;
}
/*
* Given two pads, compare the buffers queued on it and return 0 if they have
* an equal priority, 1 if the new pad is better, -1 if the old pad is better
*/
static gint
gst_multipart_mux_compare_pads (GstMultipartMux * multipart_mux,
GstMultipartPadData * old, GstMultipartPadData * new)
{
guint64 oldtime, newtime;
/* if the old pad doesn't contain anything or is even NULL, return
* the new pad as best candidate and vice versa */
if (old == NULL || old->buffer == NULL)
return 1;
if (new == NULL || new->buffer == NULL)
return -1;
/* no timestamp on old buffer, it must go first */
oldtime = old->timestamp;
if (oldtime == GST_CLOCK_TIME_NONE)
return -1;
/* no timestamp on new buffer, it must go first */
newtime = new->timestamp;
if (newtime == GST_CLOCK_TIME_NONE)
return 1;
/* old buffer has higher timestamp, new one should go first */
if (newtime < oldtime)
return 1;
/* new buffer has higher timestamp, old one should go first */
else if (newtime > oldtime)
return -1;
/* same priority if all of the above failed */
return 0;
}
/* make sure a buffer is queued on all pads, returns a pointer to an multipartpad
* that holds the best buffer or NULL when no pad was usable */
static GstMultipartPadData *
gst_multipart_mux_queue_pads (GstMultipartMux * mux)
{
GSList *walk = NULL;
GstMultipartPadData *bestpad = NULL;
g_return_val_if_fail (GST_IS_MULTIPART_MUX (mux), NULL);
/* try to make sure we have a buffer from each usable pad first */
walk = mux->collect->data;
while (walk) {
GstCollectData *data = (GstCollectData *) walk->data;
GstMultipartPadData *pad = (GstMultipartPadData *) data;
walk = g_slist_next (walk);
/* try to get a new buffer for this pad if needed and possible */
if (pad->buffer == NULL) {
GstBuffer *buf = NULL;
buf = gst_collect_pads_pop (mux->collect, data);
/* Store timestamp with segment_start and preroll */
if (buf && GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
pad->timestamp =
gst_segment_to_running_time (&data->segment, GST_FORMAT_TIME,
GST_BUFFER_TIMESTAMP (buf));
} else {
pad->timestamp = GST_CLOCK_TIME_NONE;
}
pad->buffer = buf;
}
/* we should have a buffer now, see if it is the best stream to
* pull on */
if (pad->buffer != NULL) {
if (gst_multipart_mux_compare_pads (mux, bestpad, pad) > 0) {
bestpad = pad;
}
}
}
return bestpad;
}
/* basic idea:
*
* 1) find a pad to pull on, this is done by pulling on all pads and
* looking at the buffers to decide which one should be muxed first.
* 2) create a new buffer for the header
* 3) push both buffers on best pad, go to 1
*/
static GstFlowReturn
gst_multipart_mux_collected (GstCollectPads * pads, GstMultipartMux * mux)
{
GstMultipartPadData *best;
GstFlowReturn ret = GST_FLOW_OK;
gchar *header = NULL;
size_t headerlen;
GstBuffer *headerbuf = NULL;
GstBuffer *footerbuf = NULL;
GstBuffer *databuf = NULL;
GstStructure *structure = NULL;
GstCaps *caps;
const gchar *mime;
GST_DEBUG_OBJECT (mux, "all pads are collected");
/* queue buffers on all pads; find a buffer with the lowest timestamp */
best = gst_multipart_mux_queue_pads (mux);
if (!best)
/* EOS */
goto eos;
else if (!best->buffer)
goto buffer_error;
/* If not negotiated yet set caps on src pad */
if (!mux->negotiated) {
GstCaps *newcaps;
newcaps = gst_caps_new_simple ("multipart/x-mixed-replace",
"boundary", G_TYPE_STRING, mux->boundary, NULL);
if (!gst_pad_set_caps (mux->srcpad, newcaps)) {
gst_caps_unref (newcaps);
goto nego_error;
}
gst_caps_unref (newcaps);
mux->negotiated = TRUE;
}
/* see if we need to push a segment */
if (mux->need_segment) {
GstClockTime time;
GstSegment segment;
if (best->timestamp != -1)
time = best->timestamp;
else
time = 0;
/* for the segment, we take the first timestamp we see, we don't know the
* length and the position is 0 */
gst_segment_init (&segment, GST_FORMAT_TIME);
segment.start = time;
gst_pad_push_event (mux->srcpad, gst_event_new_segment (&segment));
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, 1);
gst_buffer_fill (headerbuf, 0, header, headerlen);
g_free (header);
/* the header has the same timestamp as the data buffer (which we will push
* below) and has a duration of 0 */
GST_BUFFER_TIMESTAMP (headerbuf) = best->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 timestamp to match the running_time */
GST_BUFFER_TIMESTAMP (databuf) = best->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, 1);
gst_buffer_fill (footerbuf, 0, "\r\n", 2);
/* the footer has the same timestamp as the data buffer and has a
* duration of 0 */
GST_BUFFER_TIMESTAMP (footerbuf) = best->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_UNEXPECTED;
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 ARG_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 ARG_BOUNDARY:
g_free (mux->boundary);
mux->boundary = g_strdup (g_value_get_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;
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;
}
gboolean
gst_multipart_mux_plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (gst_multipart_mux_debug, "multipartmux", 0,
"multipart muxer");
return gst_element_register (plugin, "multipartmux", GST_RANK_NONE,
GST_TYPE_MULTIPART_MUX);
}