gstreamer/ext/mpeg2enc/gstmpeg2enc.cc

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/* GStreamer mpeg2enc (mjpegtools) wrapper
* (c) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
* (c) 2006 Mark Nauwelaerts <manauw@skynet.be>
*
* gstmpeg2enc.cc: gstreamer mpeg2enc wrapping
*
* 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-mpeg2enc
* @see_also: mpeg2dec
*
* <refsect2>
* <para>
* This element encodes raw video into an MPEG ?? stream using the
* <ulink url="http://mjpeg.sourceforge.net/">mjpegtools</ulink> library.
* Documentation on MPEG encoding in general can be found in the
* <ulink url="https://sourceforge.net/docman/display_doc.php?docid=3456&group_id=5776#s7">MJPEG Howto</ulink>
* and on the various available parameters in the documentation
* of the mpeg2enc tool in particular, which shares options with this element.
* </para>
* <title>Example pipeline</title>
* <para>
* <programlisting>
* gst-launch-0.10 videotestsrc num-buffers=1000 ! mpeg2enc ! filesink location=videotestsrc.m1v
* </programlisting>
* This example pipeline will encode a test video source to a an
* MPEG1 elementary stream (with Generic MPEG1 profile).
* </para>
* <para>
* Likely, the <link linkend="GstMpeg2enc--format">format</link> property
* is most important, as it selects the type of MPEG stream that is produced.
* In particular, default property values are dependent on the format,
* and can even be forcibly restrained to certain pre-sets (and thereby ignored).
* Note that the (S)VCD profiles also restrict the image size, so some scaling
* may be needed to accomodate this. The so-called generic profiles (as used
* in the example above) allow most parameters to be adjusted.
* <programlisting>
* gst-launch-0.10 videotestsrc num-buffers=1000 ! videoscale \
* ! mpeg2enc format=1 norm=p ! filesink location=videotestsrc.m1v
* </programlisting>
* (write everything in one line, without the backslash characters)
* This will produce an MPEG1 profile stream according to VCD2.0 specifications
* for PAL <link linkend="GstMpeg2enc--norm">norm</link> (as the image height
* is dependent on video norm).
* </para>
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstmpeg2enc.hh"
GST_DEBUG_CATEGORY (mpeg2enc_debug);
static GstElementDetails gst_mpeg2enc_details =
GST_ELEMENT_DETAILS ("mpeg2enc video encoder",
"Codec/Encoder/Video",
"High-quality MPEG-1/2 video encoder",
"Andrew Stevens <andrew.stevens@nexgo.de>\n"
"Ronald Bultje <rbultje@ronald.bitfreak.net>");
#define COMMON_VIDEO_CAPS \
"width = (int) [ 16, 4096 ], " \
"height = (int) [ 16, 4096 ], " \
"framerate = " \
" (fraction) { 24000/1001, 24/1, 25/1, 30000/1001, 30/1, 50/1, 60000/1001 }"
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw-yuv, "
"format = (fourcc) { I420 }, " COMMON_VIDEO_CAPS)
);
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/mpeg, "
"systemstream = (boolean) false, "
"mpegversion = (int) { 1, 2 }, " COMMON_VIDEO_CAPS)
);
static void gst_mpeg2enc_finalize (GObject * object);
static void gst_mpeg2enc_reset (GstMpeg2enc * enc);
static gboolean gst_mpeg2enc_setcaps (GstPad * pad, GstCaps * caps);
static GstCaps *gst_mpeg2enc_getcaps (GstPad * pad);
static gboolean gst_mpeg2enc_sink_event (GstPad * pad, GstEvent * event);
static void gst_mpeg2enc_loop (GstMpeg2enc * enc);
static GstFlowReturn gst_mpeg2enc_chain (GstPad * pad, GstBuffer * buffer);
static gboolean gst_mpeg2enc_src_activate_push (GstPad * pad, gboolean active);
static GstStateChangeReturn gst_mpeg2enc_change_state (GstElement * element,
GstStateChange transition);
static void gst_mpeg2enc_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static void gst_mpeg2enc_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
GST_BOILERPLATE (GstMpeg2enc, gst_mpeg2enc, GstElement, GST_TYPE_ELEMENT);
static void
gst_mpeg2enc_base_init (gpointer klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_set_details (element_class, &gst_mpeg2enc_details);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_template));
}
static void
gst_mpeg2enc_class_init (GstMpeg2encClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GST_DEBUG_CATEGORY_INIT (mpeg2enc_debug, "mpeg2enc", 0, "MPEG1/2 encoder");
object_class->set_property = gst_mpeg2enc_set_property;
object_class->get_property = gst_mpeg2enc_get_property;
/* register properties */
GstMpeg2EncOptions::initProperties (object_class);
object_class->finalize = GST_DEBUG_FUNCPTR (gst_mpeg2enc_finalize);
element_class->change_state = GST_DEBUG_FUNCPTR (gst_mpeg2enc_change_state);
}
static void
gst_mpeg2enc_finalize (GObject * object)
{
GstMpeg2enc *enc = GST_MPEG2ENC (object);
if (enc->encoder) {
delete enc->encoder;
enc->encoder = NULL;
}
delete enc->options;
g_mutex_free (enc->tlock);
g_cond_free (enc->cond);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_mpeg2enc_init (GstMpeg2enc * enc, GstMpeg2encClass * g_class)
{
GstElement *element = GST_ELEMENT (enc);
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
enc->sinkpad =
gst_pad_new_from_template (gst_element_class_get_pad_template
(element_class, "sink"), "sink");
gst_pad_set_setcaps_function (enc->sinkpad,
GST_DEBUG_FUNCPTR (gst_mpeg2enc_setcaps));
gst_pad_set_getcaps_function (enc->sinkpad,
GST_DEBUG_FUNCPTR (gst_mpeg2enc_getcaps));
gst_pad_set_event_function (enc->sinkpad,
GST_DEBUG_FUNCPTR (gst_mpeg2enc_sink_event));
gst_pad_set_chain_function (enc->sinkpad,
GST_DEBUG_FUNCPTR (gst_mpeg2enc_chain));
gst_element_add_pad (element, enc->sinkpad);
enc->srcpad =
gst_pad_new_from_template (gst_element_class_get_pad_template
(element_class, "src"), "src");
gst_pad_use_fixed_caps (enc->srcpad);
gst_pad_set_activatepush_function (enc->srcpad,
GST_DEBUG_FUNCPTR (gst_mpeg2enc_src_activate_push));
gst_element_add_pad (element, enc->srcpad);
enc->options = new GstMpeg2EncOptions ();
enc->encoder = NULL;
enc->buffer = NULL;
enc->tlock = g_mutex_new ();
enc->cond = g_cond_new ();
gst_mpeg2enc_reset (enc);
}
static void
gst_mpeg2enc_reset (GstMpeg2enc * enc)
{
enc->eos = FALSE;
enc->srcresult = GST_FLOW_OK;
/* in case of error'ed ending */
if (enc->buffer)
gst_buffer_unref (enc->buffer);
enc->buffer = NULL;
if (enc->encoder) {
delete enc->encoder;
enc->encoder = NULL;
}
}
/* some (!) coding to get caps depending on the video norm and chosen format */
static void
gst_mpeg2enc_add_fps (GstStructure * structure, gint fpss[])
{
GValue list = { 0, }, fps = {
0,};
guint n;
g_value_init (&list, GST_TYPE_LIST);
g_value_init (&fps, GST_TYPE_FRACTION);
for (n = 0; fpss[n] != 0; n++) {
gst_value_set_fraction (&fps, fpss[n], fpss[n + 1]);
gst_value_list_append_value (&list, &fps);
n++;
}
gst_structure_set_value (structure, "framerate", &list);
g_value_unset (&list);
g_value_unset (&fps);
}
static inline gint *
gst_mpeg2enc_get_fps (GstMpeg2enc * enc)
{
static gint fps_pal[]
= { 24, 1, 25, 1, 50, 1, 0 };
static gint fps_ntsc[]
= { 24000, 1001, 24, 1, 30000, 1001, 30, 1, 60000, 1001, 0 };
static gint fps_all[]
= { 24000, 1001, 24, 1, 30000, 1001, 30, 1, 60000, 1001, 25, 1, 50, 1, 0 };
if (enc->options->norm == 'n')
return fps_ntsc;
else if (enc->options->norm == 0)
return fps_all;
else
return fps_pal;
}
static GstStructure *
gst_mpeg2enc_structure_from_norm (GstMpeg2enc * enc, gint horiz,
gint pal_v, gint ntsc_v)
{
GstStructure *structure;
structure = gst_structure_new ("video/x-raw-yuv",
"format", GST_TYPE_FOURCC, GST_MAKE_FOURCC ('I', '4', '2', '0'), NULL);
switch (enc->options->norm) {
case 0:
{
GValue list = { 0, }
, val = {
0,};
g_value_init (&list, GST_TYPE_LIST);
g_value_init (&val, G_TYPE_INT);
g_value_set_int (&val, pal_v);
gst_value_list_append_value (&list, &val);
g_value_set_int (&val, ntsc_v);
gst_value_list_append_value (&list, &val);
gst_structure_set_value (structure, "height", &list);
g_value_unset (&list);
g_value_unset (&val);
break;
configure.ac: Improve mpeg2enc detection. This is for distributions that do ship mjpegtools, but without mpeg2enc. Al... Original commit message from CVS: 2003-12-21 Ronald Bultje <rbultje@ronald.bitfreak.net> * configure.ac: Improve mpeg2enc detection. This is for distributions that do ship mjpegtools, but without mpeg2enc. Also does object check for might there ever be ABI incompatibility. * ext/mpeg2enc/gstmpeg2enc.cc: Add Andrew as second maintainer (he's helping me), and also add an error if no caps was set. This happens if I pull before capsnego and that's something I should solve sometime else. * gst/matroska/matroska-demux.c: (gst_matroska_demux_parse_blockgroup): Fix time parsing. * gst/matroska/matroska-mux.c: (gst_matroska_mux_audio_pad_link), (gst_matroska_mux_track_header): Add caps to templates. * gst/mpegaudioparse/gstmpegaudioparse.c: (mp3_sink_factory): Add mpegversion=1 to prevent confusion with MPEG/AAC. * gst/mpegstream/gstmpegdemux.c: Remove layer since it causes warnings about unfixed caps. * gst/videotestsrc/gstvideotestsrc.c: (gst_videotestsrc_get): Fix obvious typo (we error out if caps were set, we should of course error out if *no* caps were set). * sys/oss/gstosselement.c: (gst_osselement_convert): Fix format conversion, we confused bits/bytes. * sys/oss/gstosselement.h: Improve documentation for 'bps'. * sys/v4l/TODO: Remove stuff about plugins that need removing - this was done ages ago. * sys/v4l/gstv4lmjpegsrc.c: (gst_v4lmjpegsrc_init), (gst_v4lmjpegsrc_src_convert), (gst_v4lmjpegsrc_src_query): * sys/v4l/gstv4lsrc.c: (gst_v4lsrc_init), (gst_v4lsrc_src_convert), (gst_v4lsrc_src_query): * sys/v4l2/gstv4l2src.c: (gst_v4l2src_init), (gst_v4l2src_src_convert), (gst_v4l2src_src_query): Add get_query_types(), get_formats() and query() functions.
2003-12-21 18:44:34 +00:00
}
case 'n':
gst_structure_set (structure, "height", G_TYPE_INT, ntsc_v, NULL);
break;
default:
gst_structure_set (structure, "height", G_TYPE_INT, pal_v, NULL);
break;
}
gst_structure_set (structure, "width", G_TYPE_INT, horiz, NULL);
gst_mpeg2enc_add_fps (structure, gst_mpeg2enc_get_fps (enc));
return structure;
}
static GstCaps *
gst_mpeg2enc_getcaps (GstPad * pad)
{
GstMpeg2enc *enc = GST_MPEG2ENC (GST_PAD_PARENT (pad));
GstCaps *caps;
caps = GST_PAD_CAPS (pad);
if (caps) {
gst_caps_ref (caps);
return caps;
}
switch (enc->options->format) {
case 1: /* vcd */
case 2: /* user vcd */
caps = gst_caps_new_full (gst_mpeg2enc_structure_from_norm (enc,
352, 288, 240), NULL);
break;
case 4: /* svcd */
case 5: /* user svcd */
caps = gst_caps_new_full (gst_mpeg2enc_structure_from_norm (enc,
480, 576, 480), NULL);
break;
case 6: /* vcd stills */
/* low resolution */
caps = gst_caps_new_full (gst_mpeg2enc_structure_from_norm (enc,
352, 288, 240), NULL);
/* high resolution */
gst_caps_append_structure (caps,
gst_mpeg2enc_structure_from_norm (enc, 704, 576, 480));
break;
case 7: /* svcd stills */
/* low resolution */
caps = gst_caps_new_full (gst_mpeg2enc_structure_from_norm (enc,
480, 576, 480), NULL);
/* high resolution */
gst_caps_append_structure (caps,
gst_mpeg2enc_structure_from_norm (enc, 704, 576, 480));
break;
case 0:
case 3:
case 8:
case 9:
default:
caps = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
gst_mpeg2enc_add_fps (gst_caps_get_structure (caps, 0),
gst_mpeg2enc_get_fps (enc));
break;
}
configure.ac: Improve mpeg2enc detection. This is for distributions that do ship mjpegtools, but without mpeg2enc. Al... Original commit message from CVS: 2003-12-21 Ronald Bultje <rbultje@ronald.bitfreak.net> * configure.ac: Improve mpeg2enc detection. This is for distributions that do ship mjpegtools, but without mpeg2enc. Also does object check for might there ever be ABI incompatibility. * ext/mpeg2enc/gstmpeg2enc.cc: Add Andrew as second maintainer (he's helping me), and also add an error if no caps was set. This happens if I pull before capsnego and that's something I should solve sometime else. * gst/matroska/matroska-demux.c: (gst_matroska_demux_parse_blockgroup): Fix time parsing. * gst/matroska/matroska-mux.c: (gst_matroska_mux_audio_pad_link), (gst_matroska_mux_track_header): Add caps to templates. * gst/mpegaudioparse/gstmpegaudioparse.c: (mp3_sink_factory): Add mpegversion=1 to prevent confusion with MPEG/AAC. * gst/mpegstream/gstmpegdemux.c: Remove layer since it causes warnings about unfixed caps. * gst/videotestsrc/gstvideotestsrc.c: (gst_videotestsrc_get): Fix obvious typo (we error out if caps were set, we should of course error out if *no* caps were set). * sys/oss/gstosselement.c: (gst_osselement_convert): Fix format conversion, we confused bits/bytes. * sys/oss/gstosselement.h: Improve documentation for 'bps'. * sys/v4l/TODO: Remove stuff about plugins that need removing - this was done ages ago. * sys/v4l/gstv4lmjpegsrc.c: (gst_v4lmjpegsrc_init), (gst_v4lmjpegsrc_src_convert), (gst_v4lmjpegsrc_src_query): * sys/v4l/gstv4lsrc.c: (gst_v4lsrc_init), (gst_v4lsrc_src_convert), (gst_v4lsrc_src_query): * sys/v4l2/gstv4l2src.c: (gst_v4l2src_init), (gst_v4l2src_src_convert), (gst_v4l2src_src_query): Add get_query_types(), get_formats() and query() functions.
2003-12-21 18:44:34 +00:00
GST_DEBUG_OBJECT (enc, "returned caps %" GST_PTR_FORMAT, caps);
return caps;
}
static gboolean
gst_mpeg2enc_setcaps (GstPad * pad, GstCaps * caps)
{
GstMpeg2enc *enc = GST_MPEG2ENC (GST_PAD_PARENT (pad));
GstCaps *othercaps = NULL, *mycaps;
gboolean ret;
/* does not go well to restart stream mid-way */
if (enc->encoder)
goto refuse_renegotiation;
/* since mpeg encoder does not really check, let's check caps */
mycaps = gst_pad_get_caps (pad);
othercaps = gst_caps_intersect (caps, mycaps);
gst_caps_unref (mycaps);
if (!othercaps || gst_caps_is_empty (othercaps))
goto refuse_caps;
gst_caps_unref (othercaps);
othercaps = NULL;
/* create new encoder with these settings */
enc->encoder = new GstMpeg2Encoder (enc->options, GST_ELEMENT (enc), caps);
if (!enc->encoder->setup ())
goto refuse_caps;
/* and set caps on other side, which should accept anyway */
othercaps = enc->encoder->getFormat ();
ret = gst_pad_set_caps (enc->srcpad, othercaps);
gst_caps_unref (othercaps);
othercaps = NULL;
if (!ret)
goto refuse_caps;
/* now that we have all the setup and buffers are expected incoming;
* task can get going */
gst_pad_start_task (enc->srcpad, (GstTaskFunction) gst_mpeg2enc_loop, enc);
return TRUE;
refuse_caps:
{
GST_WARNING_OBJECT (enc, "refused caps %" GST_PTR_FORMAT, caps);
if (othercaps)
gst_caps_unref (othercaps);
if (enc->encoder) {
delete enc->encoder;
enc->encoder = NULL;
}
return FALSE;
}
refuse_renegotiation:
{
GST_WARNING_OBJECT (enc, "refused renegotiation (to %" GST_PTR_FORMAT ")",
caps);
return FALSE;
}
}
static gboolean
gst_mpeg2enc_sink_event (GstPad * pad, GstEvent * event)
{
GstMpeg2enc *enc;
gboolean result = TRUE;
enc = GST_MPEG2ENC (GST_PAD_PARENT (pad));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
/* forward event */
result = gst_pad_push_event (enc->srcpad, event);
/* no special action as there is not much to flush;
* neither is it possible to halt the mpeg encoding loop */
goto done;
break;
case GST_EVENT_FLUSH_STOP:
/* forward event */
result = gst_pad_push_event (enc->srcpad, event);
if (!result)
goto done;
/* this clears the error state in case of a failure in encoding task;
* so chain function can carry on again */
GST_MPEG2ENC_MUTEX_LOCK (enc);
enc->srcresult = GST_FLOW_OK;
GST_MPEG2ENC_MUTEX_UNLOCK (enc);
goto done;
break;
case GST_EVENT_EOS:
/* inform the encoding task that it can stop now */
GST_MPEG2ENC_MUTEX_LOCK (enc);
enc->eos = TRUE;
GST_MPEG2ENC_SIGNAL (enc);
GST_MPEG2ENC_MUTEX_UNLOCK (enc);
/* eat this event for now, task will send eos when finished */
gst_event_unref (event);
goto done;
break;
default:
/* for a serialized event, wait until an earlier buffer is gone,
* though this is no guarantee as to when the encoder is done with it */
if (GST_EVENT_IS_SERIALIZED (event)) {
GST_MPEG2ENC_MUTEX_LOCK (enc);
while (enc->buffer)
GST_MPEG2ENC_WAIT (enc);
GST_MPEG2ENC_MUTEX_UNLOCK (enc);
}
break;
}
result = gst_pad_push_event (enc->srcpad, event);
done:
return result;
}
static void
gst_mpeg2enc_loop (GstMpeg2enc * enc)
{
/* do not try to resume or start when output problems;
* also ensures a proper (forced) state change */
if (enc->srcresult != GST_FLOW_OK)
goto ignore;
if (enc->encoder) {
/* note that init performs a pre-fill and therefore needs buffers */
enc->encoder->init ();
/* task will stay in here during all of the encoding */
enc->encoder->encode ();
/* if not well and truly eos, something strange happened */
if (!enc->eos) {
GST_ERROR_OBJECT (enc, "encoding task ended without being eos");
/* notify the chain function that it's over */
GST_MPEG2ENC_MUTEX_LOCK (enc);
enc->srcresult = GST_FLOW_ERROR;
GST_MPEG2ENC_SIGNAL (enc);
GST_MPEG2ENC_MUTEX_UNLOCK (enc);
} else {
/* send eos if this was not a forced stop or other problem */
if (enc->srcresult == GST_FLOW_OK)
gst_pad_push_event (enc->srcpad, gst_event_new_eos ());
goto eos;
}
} else {
GST_WARNING_OBJECT (enc, "task started without Mpeg2Encoder");
}
/* fall-through */
done:
{
/* no need to run wildly, stopped elsewhere, e.g. state change */
GST_DEBUG_OBJECT (enc, "pausing encoding task");
gst_pad_pause_task (enc->srcpad);
return;
}
eos:
{
GST_DEBUG_OBJECT (enc, "encoding task reached eos");
goto done;
}
ignore:
{
GST_DEBUG_OBJECT (enc, "not looping because encoding task encountered %s",
gst_flow_get_name (enc->srcresult));
goto done;
}
}
static GstFlowReturn
gst_mpeg2enc_chain (GstPad * pad, GstBuffer * buffer)
{
GstMpeg2enc *enc;
enc = GST_MPEG2ENC (GST_PAD_PARENT (pad));
if (G_UNLIKELY (!enc->encoder))
goto not_negotiated;
GST_MPEG2ENC_MUTEX_LOCK (enc);
if (G_UNLIKELY (enc->eos))
goto eos;
if (G_UNLIKELY (enc->srcresult != GST_FLOW_OK))
goto ignore;
/* things look good, now inform the encoding task that a buffer is ready */
while (enc->buffer)
GST_MPEG2ENC_WAIT (enc);
enc->buffer = buffer;
GST_MPEG2ENC_SIGNAL (enc);
GST_MPEG2ENC_MUTEX_UNLOCK (enc);
/* buffer will be released by task */
return GST_FLOW_OK;
/* special cases */
not_negotiated:
{
GST_ELEMENT_ERROR (enc, CORE, NEGOTIATION, (NULL),
("format wasn't negotiated before chain function"));
gst_buffer_unref (buffer);
return GST_FLOW_NOT_NEGOTIATED;
}
eos:
{
GST_DEBUG_OBJECT (enc, "ignoring buffer at end-of-stream");
GST_MPEG2ENC_MUTEX_UNLOCK (enc);
gst_buffer_unref (buffer);
return GST_FLOW_UNEXPECTED;
}
ignore:
{
GST_DEBUG_OBJECT (enc,
"ignoring buffer because encoding task encountered %s",
gst_flow_get_name (enc->srcresult));
GST_MPEG2ENC_MUTEX_UNLOCK (enc);
gst_buffer_unref (buffer);
return enc->srcresult;
}
}
static void
gst_mpeg2enc_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GST_MPEG2ENC (object)->options->getProperty (prop_id, value);
}
static void
gst_mpeg2enc_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GST_MPEG2ENC (object)->options->setProperty (prop_id, value);
}
static gboolean
gst_mpeg2enc_src_activate_push (GstPad * pad, gboolean active)
{
gboolean result = TRUE;
GstMpeg2enc *enc;
enc = GST_MPEG2ENC (GST_PAD_PARENT (pad));
if (active) {
/* setcaps will start task once encoder is setup */
} else {
/* can only end the encoding loop by forcing eos */
GST_MPEG2ENC_MUTEX_LOCK (enc);
enc->eos = TRUE;
enc->srcresult = GST_FLOW_WRONG_STATE;
GST_MPEG2ENC_SIGNAL (enc);
GST_MPEG2ENC_MUTEX_UNLOCK (enc);
/* encoding loop should have ended now and can be joined */
result = gst_pad_stop_task (pad);
}
return result;
}
static GstStateChangeReturn
gst_mpeg2enc_change_state (GstElement * element, GstStateChange transition)
{
GstMpeg2enc *enc = GST_MPEG2ENC (element);
GstStateChangeReturn ret;
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_mpeg2enc_reset (enc);
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_mpeg2enc_log_callback (log_level_t level, const char *message)
{
GstDebugLevel gst_level;
switch (level) {
case LOG_NONE:
gst_level = GST_LEVEL_NONE;
break;
case LOG_ERROR:
gst_level = GST_LEVEL_ERROR;
break;
case LOG_INFO:
gst_level = GST_LEVEL_INFO;
break;
case LOG_DEBUG:
gst_level = GST_LEVEL_DEBUG;
break;
default:
gst_level = GST_LEVEL_INFO;
break;
}
gst_debug_log (mpeg2enc_debug, gst_level, "", "", 0, NULL, message);
/* chain up to the old handler;
* this could actually be a handler from another mjpegtools based
* plugin; in which case messages can come out double or from
* the wrong plugin (element)... */
old_handler (level, message);
}
#endif
static gboolean
plugin_init (GstPlugin * plugin)
{
#ifndef GST_DISABLE_GST_DEBUG
old_handler = mjpeg_log_set_handler (gst_mpeg2enc_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, "mpeg2enc",
GST_RANK_NONE, GST_TYPE_MPEG2ENC);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"mpeg2enc",
"High-quality MPEG-1/2 video encoder",
plugin_init, VERSION, "GPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)