gstreamer/subprojects/gst-plugins-bad/ext/mplex/gstmplex.cc
Ruben Gonzalez 059965fe53 doc: Fix newline char between authors
Found running `gst-inspect-1.0 -a |& grep -v ":" | grep @`

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4682>
2023-05-20 05:48:23 +00:00

829 lines
23 KiB
C++

/* GStreamer mplex (mjpegtools) wrapper
* (c) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
* (c) 2008 Mark Nauwelaerts <mnauw@users.sourceforge.net>
*
* gstmplex.cc: gstreamer mplex wrapper
*
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-mplex
* @see_also: mpeg2enc
*
* This element is an audio/video multiplexer for MPEG-1/2 video streams
* and (un)compressed audio streams such as AC3, MPEG layer I/II/III.
* It is based on the [mjpegtools](http://mjpeg.sourceforge.net/) library.
* Documentation on creating MPEG videos in general can be found in the
* [MJPEG Howto](https://sourceforge.net/docman/display_doc.php?docid=3456&group_id=5776)
* and the man-page of the mplex tool documents the properties of this element,
* which are shared with the mplex tool.
*
* ## Example pipeline
*
* |[
* gst-launch-1.0 -v videotestsrc num-buffers=1000 ! mpeg2enc ! mplex ! filesink location=videotestsrc.mpg
* ]| This example pipeline will encode a test video source to an
* MPEG1 elementary stream and multiplexes this to an MPEG system stream.
*
* If several streams are being multiplexed, there should (as usual) be
* a queue in each stream, and due to mplex' buffering the capacities of these
* may have to be set to a few times the default settings to prevent the
* pipeline stalling.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <gst/glib-compat-private.h>
#include <gst/audio/audio.h>
#include "gstmplex.hh"
#include "gstmplexoutputstream.hh"
#include "gstmplexibitstream.hh"
#include "gstmplexjob.hh"
GST_DEBUG_CATEGORY (mplex_debug);
static GstStaticPadTemplate src_templ = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/mpeg, systemstream = (boolean) true ")
);
static GstStaticPadTemplate video_sink_templ =
GST_STATIC_PAD_TEMPLATE ("video_%u",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS ("video/mpeg, "
"mpegversion = (int) { 1, 2 }, "
"systemstream = (boolean) false, "
"width = (int) [ 16, 4096 ], "
"height = (int) [ 16, 4096 ], framerate = (fraction) [ 0, MAX ]")
);
#define COMMON_AUDIO_CAPS \
"channels = (int) [ 1, 8 ], " \
"rate = (int) [ 8000, 96000 ]"
static GstStaticPadTemplate audio_sink_templ =
GST_STATIC_PAD_TEMPLATE ("audio_%u",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS ("audio/mpeg, "
"mpegversion = (int) 1, "
"layer = (int) [ 1, 3 ], "
COMMON_AUDIO_CAPS "; "
"audio/x-ac3, "
COMMON_AUDIO_CAPS "; "
"audio/x-dts; "
"audio/x-raw, "
"format = (string) { S16BE, S20BE, S24BE }, "
"rate = (int) { 48000, 96000 }, " "channels = (int) [ 1, 6 ]")
);
/* FIXME: subtitles */
static void gst_mplex_finalize (GObject * object);
static void gst_mplex_reset (GstMplex * mplex);
static void gst_mplex_loop (GstMplex * mplex);
static GstPad *gst_mplex_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * name, const GstCaps * caps);
static void gst_mplex_release_pad (GstElement * element, GstPad * pad);
static gboolean gst_mplex_src_activate_mode (GstPad * pad, GstObject * parent,
GstPadMode mode, gboolean active);
static GstStateChangeReturn gst_mplex_change_state (GstElement * element,
GstStateChange transition);
static void gst_mplex_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static void gst_mplex_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static gboolean mplex_element_init (GstPlugin * plugin);
#define parent_class gst_mplex_parent_class
G_DEFINE_TYPE (GstMplex, gst_mplex, GST_TYPE_ELEMENT);
GST_ELEMENT_REGISTER_DEFINE_CUSTOM (mplex, mplex_element_init);
static void
gst_mplex_class_init (GstMplexClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GST_DEBUG_CATEGORY_INIT (mplex_debug, "mplex", 0, "MPEG video/audio muxer");
object_class->set_property = gst_mplex_set_property;
object_class->get_property = gst_mplex_get_property;
/* register properties */
GstMplexJob::initProperties (object_class);
object_class->finalize = GST_DEBUG_FUNCPTR (gst_mplex_finalize);
element_class->change_state = GST_DEBUG_FUNCPTR (gst_mplex_change_state);
element_class->request_new_pad =
GST_DEBUG_FUNCPTR (gst_mplex_request_new_pad);
element_class->release_pad = GST_DEBUG_FUNCPTR (gst_mplex_release_pad);
gst_element_class_set_static_metadata (element_class,
"mplex video multiplexer", "Codec/Muxer",
"High-quality MPEG/DVD/SVCD/VCD video/audio multiplexer",
"Andrew Stevens <andrew.stevens@nexgo.de>, "
"Ronald Bultje <rbultje@ronald.bitfreak.net>, "
"Mark Nauwelaerts <mnauw@users.sourceforge.net>");
gst_element_class_add_static_pad_template (element_class, &src_templ);
gst_element_class_add_static_pad_template (element_class, &video_sink_templ);
gst_element_class_add_static_pad_template (element_class, &audio_sink_templ);
}
static void
gst_mplex_finalize (GObject * object)
{
GstMplex *mplex = GST_MPLEX (object);
GSList *walk;
/* release all pads */
walk = mplex->pads;
while (walk) {
GstMplexPad *mpad = (GstMplexPad *) walk->data;
if (mpad->pad)
gst_object_unref (mpad->pad);
mpad->pad = NULL;
walk = walk->next;
}
/* clean up what's left of them */
gst_mplex_reset (mplex);
/* ... and of the rest */
delete mplex->job;
g_mutex_clear (&mplex->tlock);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_mplex_init (GstMplex * mplex)
{
GstElement *element = GST_ELEMENT (mplex);
mplex->srcpad = gst_pad_new_from_static_template (&src_templ, "src");
gst_element_add_pad (element, mplex->srcpad);
gst_pad_use_fixed_caps (mplex->srcpad);
gst_pad_set_activatemode_function (mplex->srcpad,
GST_DEBUG_FUNCPTR (gst_mplex_src_activate_mode));
mplex->job = new GstMplexJob ();
mplex->num_apads = 0;
mplex->num_vpads = 0;
g_mutex_init (&mplex->tlock);
gst_mplex_reset (mplex);
}
static void
gst_mplex_reset (GstMplex * mplex)
{
GSList *walk;
GSList *nlist = NULL;
mplex->eos = FALSE;
mplex->srcresult = GST_FLOW_CUSTOM_SUCCESS;
/* reset existing streams */
walk = mplex->pads;
while (walk != NULL) {
GstMplexPad *mpad;
mpad = (GstMplexPad *) walk->data;
mpad->needed = 0;
mpad->eos = FALSE;
gst_adapter_clear (mpad->adapter);
if (mpad->bs) {
delete mpad->bs;
mpad->bs = NULL;
}
if (!mpad->pad) {
g_cond_clear (&mpad->cond);
g_object_unref (mpad->adapter);
g_free (mpad);
} else
nlist = g_slist_append (nlist, mpad);
walk = walk->next;
}
g_slist_free (mplex->pads);
mplex->pads = nlist;
/* clear mplex stuff */
/* clean up stream settings */
while (!mplex->job->streams.empty ()) {
delete mplex->job->streams.back ();
mplex->job->streams.pop_back ();
}
while (!mplex->job->video_param.empty ()) {
delete mplex->job->video_param.back ();
mplex->job->video_param.pop_back ();
}
while (!mplex->job->lpcm_param.empty ()) {
delete mplex->job->lpcm_param.back ();
mplex->job->lpcm_param.pop_back ();
}
mplex->job->audio_tracks = 0;
mplex->job->video_tracks = 0;
mplex->job->lpcm_tracks = 0;
}
static gboolean
gst_mplex_setcaps (GstPad * pad, GstCaps * caps)
{
GstMplex *mplex;
const gchar *mime;
GstStructure *structure;
StreamKind type;
JobStream *jobstream;
GstMplexIBitStream *inputstream;
GstMplexPad *mpad;
GstCaps *othercaps, *templ;
gboolean ret = TRUE;
mplex = GST_MPLEX (GST_PAD_PARENT (pad));
/* does not go well to negotiate when started */
if (mplex->srcresult != GST_FLOW_CUSTOM_SUCCESS)
goto refuse_renegotiation;
/* since muxer does not really check much ... */
templ = gst_pad_get_pad_template_caps (pad);
othercaps = gst_caps_intersect (caps, templ);
gst_caps_unref (templ);
if (othercaps)
gst_caps_unref (othercaps);
else
goto refuse_caps;
/* set the fixed template caps on the srcpad, should accept without objection */
othercaps = gst_pad_get_pad_template_caps (mplex->srcpad);
ret = gst_pad_set_caps (mplex->srcpad, othercaps);
gst_caps_unref (othercaps);
if (!ret)
goto refuse_caps;
structure = gst_caps_get_structure (caps, 0);
mime = gst_structure_get_name (structure);
if (!strcmp (mime, "video/mpeg")) { /* video */
VideoParams *params;
type = MPEG_VIDEO;
if (mplex->job->bufsize)
params = VideoParams::Checked (mplex->job->bufsize);
else
params = VideoParams::Default (mplex->job->mux_format);
/* set standard values if forced by the selected profile */
if (params->Force (mplex->job->mux_format))
GST_WARNING_OBJECT (mplex,
"overriding non-standard option due to selected profile");
mplex->job->video_param.push_back (params);
mplex->job->video_tracks++;
} else { /* audio */
if (!strcmp (mime, "audio/mpeg")) {
type = MPEG_AUDIO;
} else if (!strcmp (mime, "audio/x-ac3")) {
type = AC3_AUDIO;
} else if (!strcmp (mime, "audio/x-dts")) {
type = DTS_AUDIO;
} else if (!strcmp (mime, "audio/x-raw")) {
LpcmParams *params;
gint bits, chans, rate;
GstAudioInfo info;
type = LPCM_AUDIO;
gst_audio_info_init (&info);
if (!gst_audio_info_from_caps (&info, caps))
goto refuse_caps;
rate = GST_AUDIO_INFO_RATE (&info);
chans = GST_AUDIO_INFO_CHANNELS (&info);
bits = GST_AUDIO_INFO_DEPTH (&info);
/* set LPCM params */
params = LpcmParams::Checked (rate, chans, bits);
mplex->job->lpcm_param.push_back (params);
mplex->job->lpcm_tracks++;
} else
goto refuse_caps;
mplex->job->audio_tracks++;
}
mpad = (GstMplexPad *) gst_pad_get_element_private (pad);
g_return_val_if_fail (mpad, FALSE);
inputstream = new GstMplexIBitStream (mpad);
mpad->bs = inputstream;
jobstream = new JobStream (inputstream, type);
mplex->job->streams.push_back (jobstream);
return TRUE;
refuse_caps:
{
GST_WARNING_OBJECT (mplex, "refused caps %" GST_PTR_FORMAT, caps);
/* undo if we were a bit too fast/confident */
if (gst_pad_has_current_caps (mplex->srcpad))
gst_pad_set_caps (mplex->srcpad, NULL);
return FALSE;
}
refuse_renegotiation:
{
GST_WARNING_OBJECT (mplex, "already started; "
"refused (re)negotiation (to %" GST_PTR_FORMAT ")", caps);
return FALSE;
}
}
static void
gst_mplex_loop (GstMplex * mplex)
{
GstMplexOutputStream *out = NULL;
Multiplexor *mux = NULL;
GSList *walk;
GstSegment segment;
/* do not try to resume muxing after it finished
* this can be relevant mainly/only in case of forced state change */
if (mplex->eos)
goto eos;
/* inform downstream about what's coming */
gst_segment_init (&segment, GST_FORMAT_BYTES);
gst_pad_push_event (mplex->srcpad, gst_event_new_segment (&segment));
/* hm (!) each inputstream really needs an initial read
* so that all is internally in the proper state */
walk = mplex->pads;
while (walk != NULL) {
GstMplexPad *mpad;
mpad = (GstMplexPad *) walk->data;
mpad->bs->ReadBuffer ();
walk = walk->next;
}
/* create new multiplexer with inputs/output */
out = new GstMplexOutputStream (mplex, mplex->srcpad);
#if GST_MJPEGTOOLS_API >= 10900
mux = new Multiplexor (*mplex->job, *out, NULL);
#else
mux = new Multiplexor (*mplex->job, *out);
#endif
if (mux) {
mux->Multiplex ();
delete mux;
delete out;
/* if not well and truly eos, something strange happened */
if (!mplex->eos) {
GST_ERROR_OBJECT (mplex, "muxing task ended without being eos");
/* notify there is no point in collecting any more */
GST_MPLEX_MUTEX_LOCK (mplex);
mplex->srcresult = GST_FLOW_ERROR;
GST_MPLEX_SIGNAL_ALL (mplex);
GST_MPLEX_MUTEX_UNLOCK (mplex);
} else
goto eos;
} else {
GST_WARNING_OBJECT (mplex, "failed to create Multiplexor");
}
/* fall-through */
done:
{
/* no need to run wildly, stopped elsewhere, e.g. state change */
GST_DEBUG_OBJECT (mplex, "pausing muxing task");
gst_pad_pause_task (mplex->srcpad);
return;
}
eos:
{
GST_DEBUG_OBJECT (mplex, "encoding task reached eos");
goto done;
}
}
static gboolean
gst_mplex_sink_event (GstPad * sinkpad, GstObject * parent, GstEvent * event)
{
GstMplex *mplex;
GstMplexPad *mpad;
gboolean result = TRUE;
mplex = (GstMplex *) parent;
mpad = (GstMplexPad *) gst_pad_get_element_private (sinkpad);
g_return_val_if_fail (mpad, FALSE);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
/* forward event */
gst_pad_event_default (sinkpad, parent, event);
/* now unblock the chain function */
GST_MPLEX_MUTEX_LOCK (mplex);
mplex->srcresult = GST_FLOW_FLUSHING;
GST_MPLEX_SIGNAL (mplex, mpad);
GST_MPLEX_MUTEX_UNLOCK (mplex);
/* no way to pause/restart loop task */
goto done;
case GST_EVENT_FLUSH_STOP:
/* forward event */
gst_pad_event_default (sinkpad, parent, event);
/* clear state and resume */
GST_MPLEX_MUTEX_LOCK (mplex);
gst_adapter_clear (mpad->adapter);
mplex->srcresult = GST_FLOW_OK;
GST_MPLEX_MUTEX_UNLOCK (mplex);
goto done;
case GST_EVENT_SEGMENT:
/* eat segments; we make our own (byte)stream */
gst_event_unref (event);
goto done;
case GST_EVENT_EOS:
/* inform this pad that it can stop now */
GST_MPLEX_MUTEX_LOCK (mplex);
mpad->eos = TRUE;
GST_MPLEX_SIGNAL (mplex, mpad);
GST_MPLEX_MUTEX_UNLOCK (mplex);
/* eat this event for now, task will send eos when finished */
gst_event_unref (event);
goto done;
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
result = gst_mplex_setcaps (sinkpad, caps);
gst_event_unref (event);
goto done;
}
default:
/* for a serialized event, wait until earlier data is gone,
* though this is no guarantee as to when task is done with it.
* Only wait if loop has been started already */
if (GST_EVENT_IS_SERIALIZED (event)) {
GST_MPLEX_MUTEX_LOCK (mplex);
while (mplex->srcresult == GST_FLOW_OK && !mpad->needed)
GST_MPLEX_WAIT (mplex, mpad);
GST_MPLEX_MUTEX_UNLOCK (mplex);
}
break;
}
result = gst_pad_event_default (sinkpad, parent, event);
done:
return result;
}
/* starts task if conditions are right for it
* must be called with mutex_lock held */
static void
gst_mplex_start_task (GstMplex * mplex)
{
/* start task to create multiplexor and start muxing */
if (G_UNLIKELY (mplex->srcresult == GST_FLOW_CUSTOM_SUCCESS)
&& mplex->job->video_tracks == mplex->num_vpads
&& mplex->job->audio_tracks == mplex->num_apads) {
gst_pad_start_task (mplex->srcpad, (GstTaskFunction) gst_mplex_loop, mplex,
NULL);
mplex->srcresult = GST_FLOW_OK;
}
}
static GstFlowReturn
gst_mplex_chain (GstPad * sinkpad, GstObject * parent, GstBuffer * buffer)
{
GstMplex *mplex;
GstMplexPad *mpad;
mplex = (GstMplex *) parent;
mpad = (GstMplexPad *) gst_pad_get_element_private (sinkpad);
g_return_val_if_fail (mpad, GST_FLOW_ERROR);
/* check if pad were properly negotiated and set up */
if (G_UNLIKELY (!mpad->bs)) {
GST_ELEMENT_ERROR (mplex, CORE, NEGOTIATION, (NULL),
("input pad has not been set up prior to chain function"));
return GST_FLOW_NOT_NEGOTIATED;
}
GST_MPLEX_MUTEX_LOCK (mplex);
gst_mplex_start_task (mplex);
if (G_UNLIKELY (mpad->eos))
goto eos;
if (G_UNLIKELY (mplex->srcresult != GST_FLOW_OK))
goto ignore;
gst_adapter_push (mpad->adapter, buffer);
buffer = NULL;
while (gst_adapter_available (mpad->adapter) >= mpad->needed) {
GST_MPLEX_SIGNAL (mplex, mpad);
GST_MPLEX_WAIT (mplex, mpad);
/* may have become flushing or in error */
if (G_UNLIKELY (mplex->srcresult != GST_FLOW_OK))
goto ignore;
/* or been removed */
if (G_UNLIKELY (mpad->eos))
goto eos;
}
GST_MPLEX_MUTEX_UNLOCK (mplex);
return GST_FLOW_OK;
/* special cases */
eos:
{
GST_DEBUG_OBJECT (mplex, "ignoring buffer at end-of-stream");
GST_MPLEX_MUTEX_UNLOCK (mplex);
gst_buffer_unref (buffer);
return GST_FLOW_EOS;
}
ignore:
{
GstFlowReturn ret = mplex->srcresult;
GST_DEBUG_OBJECT (mplex, "ignoring buffer because src task encountered %s",
gst_flow_get_name (ret));
GST_MPLEX_MUTEX_UNLOCK (mplex);
if (buffer)
gst_buffer_unref (buffer);
return ret;
}
}
static GstPad *
gst_mplex_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * name, const GstCaps * caps)
{
GstElementClass *klass = GST_ELEMENT_GET_CLASS (element);
GstMplex *mplex = GST_MPLEX (element);
gchar *padname;
GstPad *newpad;
GstMplexPad *mpad;
if (templ == gst_element_class_get_pad_template (klass, "audio_%u")) {
GST_DEBUG_OBJECT (mplex, "request pad audio %d", mplex->num_apads);
padname = g_strdup_printf ("audio_%u", mplex->num_apads++);
} else if (templ == gst_element_class_get_pad_template (klass, "video_%u")) {
GST_DEBUG_OBJECT (mplex, "request pad video %d", mplex->num_vpads);
padname = g_strdup_printf ("video_%u", mplex->num_vpads++);
} else {
GST_WARNING_OBJECT (mplex, "This is not our template!");
return NULL;
}
newpad = gst_pad_new_from_template (templ, padname);
g_free (padname);
mpad = g_new0 (GstMplexPad, 1);
mpad->adapter = gst_adapter_new ();
g_cond_init (&mpad->cond);
gst_object_ref (newpad);
mpad->pad = newpad;
gst_pad_set_chain_function (newpad, GST_DEBUG_FUNCPTR (gst_mplex_chain));
gst_pad_set_event_function (newpad, GST_DEBUG_FUNCPTR (gst_mplex_sink_event));
gst_pad_set_element_private (newpad, mpad);
gst_element_add_pad (element, newpad);
mplex->pads = g_slist_append (mplex->pads, mpad);
return newpad;
}
static void
gst_mplex_release_pad (GstElement * element, GstPad * pad)
{
GstMplex *mplex = GST_MPLEX (element);
GstMplexPad *mpad;
g_return_if_fail (pad);
mpad = (GstMplexPad *) gst_pad_get_element_private (pad);
g_return_if_fail (mpad);
if (gst_element_remove_pad (element, pad)) {
gchar *padname;
GST_MPLEX_MUTEX_LOCK (mplex);
mpad->eos = TRUE;
g_assert (mpad->pad == pad);
mpad->pad = NULL;
/* wake up if waiting on this pad */
GST_MPLEX_SIGNAL (mplex, mpad);
padname = gst_object_get_name (GST_OBJECT (pad));
/* now only drop what might be last ref */
gst_object_unref (pad);
if (strstr (padname, "audio")) {
mplex->num_apads--;
} else {
mplex->num_vpads--;
}
g_free (padname);
/* may now be up to us to get things going */
if (GST_STATE (element) > GST_STATE_READY)
gst_mplex_start_task (mplex);
GST_MPLEX_MUTEX_UNLOCK (mplex);
}
}
static void
gst_mplex_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GST_MPLEX (object)->job->getProperty (prop_id, value);
}
static void
gst_mplex_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GST_MPLEX (object)->job->setProperty (prop_id, value);
}
static gboolean
gst_mplex_src_activate_mode (GstPad * pad, GstObject * parent,
GstPadMode mode, gboolean active)
{
gboolean result = TRUE;
GstMplex *mplex;
mplex = GST_MPLEX (parent);
if (mode != GST_PAD_MODE_PUSH)
return FALSE;
if (active) {
/* chain will start task once all streams have been setup */
} else {
/* end the muxing loop by forcing eos and unblock chains */
GST_MPLEX_MUTEX_LOCK (mplex);
mplex->eos = TRUE;
mplex->srcresult = GST_FLOW_FLUSHING;
GST_MPLEX_SIGNAL_ALL (mplex);
GST_MPLEX_MUTEX_UNLOCK (mplex);
/* muxing loop should have ended now and can be joined */
result = gst_pad_stop_task (pad);
}
return result;
}
static GstStateChangeReturn
gst_mplex_change_state (GstElement * element, GstStateChange transition)
{
GstMplex *mplex = GST_MPLEX (element);
GstStateChangeReturn ret;
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (ret == GST_STATE_CHANGE_FAILURE)
goto done;
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_mplex_reset (mplex);
break;
default:
break;
}
done:
return ret;
}
#ifndef GST_DISABLE_GST_DEBUG
static mjpeg_log_handler_t old_handler = NULL;
/* note that this will affect all mjpegtools elements/threads */
static void
gst_mplex_log_callback (log_level_t level, const char *message)
{
GstDebugLevel gst_level;
#if GST_MJPEGTOOLS_API >= 10900
static const gint mjpeg_log_error = mjpeg_loglev_t ("error");
static const gint mjpeg_log_warn = mjpeg_loglev_t ("warn");
static const gint mjpeg_log_info = mjpeg_loglev_t ("info");
static const gint mjpeg_log_debug = mjpeg_loglev_t ("debug");
#else
static const gint mjpeg_log_error = LOG_ERROR;
static const gint mjpeg_log_warn = LOG_WARN;
static const gint mjpeg_log_info = LOG_INFO;
static const gint mjpeg_log_debug = LOG_DEBUG;
#endif
if (level == mjpeg_log_error) {
gst_level = GST_LEVEL_ERROR;
} else if (level == mjpeg_log_warn) {
gst_level = GST_LEVEL_WARNING;
} else if (level == mjpeg_log_info) {
gst_level = GST_LEVEL_INFO;
} else if (level == mjpeg_log_debug) {
gst_level = GST_LEVEL_DEBUG;
} else {
gst_level = GST_LEVEL_INFO;
}
/* message could have a % in it, do not segfault in such case */
gst_debug_log (mplex_debug, gst_level, "", "", 0, NULL, "%s", message);
/* chain up to the old handler;
* this could actually be a handler from another mjpegtools based
* gstreamer element; in which case messages can come out double or from
* the wrong element ... */
old_handler (level, message);
}
#endif
static gboolean
mplex_element_init (GstPlugin * plugin)
{
#ifndef GST_DISABLE_GST_DEBUG
old_handler = mjpeg_log_set_handler (gst_mplex_log_callback);
g_assert (old_handler != NULL);
#endif
/* in any case, we do not want default handler output */
mjpeg_default_handler_verbosity (0);
return gst_element_register (plugin, "mplex", GST_RANK_NONE, GST_TYPE_MPLEX);
}
static gboolean
plugin_init (GstPlugin * plugin)
{
return GST_ELEMENT_REGISTER (mplex, plugin);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
mplex,
"High-quality MPEG/DVD/SVCD/VCD video/audio multiplexer",
plugin_init, VERSION, "GPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)