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22c326edea
An end packet is only produced once for the last subtitle, so multiple GAP events between subtitles would result only in a single end packet and nothing else otherwise. This would potentially starve downstream then, so instead forward the GAP events in that case. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3534>
621 lines
18 KiB
C
621 lines
18 KiB
C
/* GStreamer
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* Copyright (C) <2020> Jan Schmidt <jan@centricular.com>
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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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 "gstdvbsubenc.h"
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#include <string.h>
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/**
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* SECTION:element-dvbsubenc
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* @title: dvbsubenc
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* @see_also: dvbsuboverlay
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*
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* This element encodes AYUV video frames to DVB subpictures.
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*
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* ## Example pipelines
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* |[
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* gst-launch-1.0 videotestsrc num-buffers=900 ! video/x-raw,width=720,height=576,framerate=30/1 ! x264enc bitrate=500 ! h264parse ! mpegtsmux name=mux ! filesink location=test.ts filesrc location=test-subtitles.srt ! subparse ! textrender ! dvbsubenc ! mux.
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* ]|
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* Encode a test video signal and an SRT subtitle file to MPEG-TS with a DVB subpicture track
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*
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*/
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#define DEFAULT_MAX_COLOURS 16
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#define DEFAULT_TS_OFFSET 0
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enum
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{
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PROP_0,
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PROP_MAX_COLOURS,
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PROP_TS_OFFSET
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};
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#define gst_dvb_sub_enc_parent_class parent_class
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G_DEFINE_TYPE (GstDvbSubEnc, gst_dvb_sub_enc, GST_TYPE_ELEMENT);
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GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (dvbsubenc, "dvbsubenc", GST_RANK_NONE,
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GST_TYPE_DVB_SUB_ENC, GST_DEBUG_CATEGORY_INIT (gst_dvb_sub_enc_debug,
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"dvbsubenc", 0, "DVB subtitle encoder");
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);
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static void gst_dvb_sub_enc_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static void gst_dvb_sub_enc_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static gboolean gst_dvb_sub_enc_src_event (GstPad * srcpad, GstObject * parent,
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GstEvent * event);
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static GstFlowReturn gst_dvb_sub_enc_chain (GstPad * pad, GstObject * parent,
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GstBuffer * buf);
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static void gst_dvb_sub_enc_finalize (GObject * gobject);
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static gboolean gst_dvb_sub_enc_sink_event (GstPad * pad, GstObject * parent,
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GstEvent * event);
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static gboolean gst_dvb_sub_enc_sink_setcaps (GstPad * pad, GstCaps * caps);
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static GstStaticPadTemplate sink_template = 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 ("video/x-raw, format = (string) { AYUV }")
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);
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static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("subpicture/x-dvb")
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);
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GST_DEBUG_CATEGORY (gst_dvb_sub_enc_debug);
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static void
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gst_dvb_sub_enc_class_init (GstDvbSubEncClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gobject_class->finalize = gst_dvb_sub_enc_finalize;
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gst_element_class_add_static_pad_template (gstelement_class, &sink_template);
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gst_element_class_add_static_pad_template (gstelement_class, &src_template);
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gst_element_class_set_static_metadata (gstelement_class,
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"DVB subtitle encoder", "Codec/Decoder/Video",
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"Encodes AYUV video frames streams into DVB subtitles",
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"Jan Schmidt <jan@centricular.com>");
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gobject_class->set_property = gst_dvb_sub_enc_set_property;
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gobject_class->get_property = gst_dvb_sub_enc_get_property;
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/**
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* GstDvbSubEnc:max-colours
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*
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* Set the maximum number of colours to output into the DVB subpictures.
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* Good choices are 4, 16 or 256 - as they correspond to the 2-bit, 4-bit
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* and 8-bit palette modes that the DVB subpicture encoding supports.
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*/
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g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_MAX_COLOURS,
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g_param_spec_int ("max-colours", "Maximum Colours",
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"Maximum Number of Colours to output", 1, 256, DEFAULT_MAX_COLOURS,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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/**
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* GstDvbSubEnc:ts-offset
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*
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* Advance or delay the output subpicture time-line. This is a
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* convenience property for setting the src pad offset.
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*/
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g_object_class_install_property (gobject_class, PROP_TS_OFFSET,
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g_param_spec_int64 ("ts-offset", "Subtitle Timestamp Offset",
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"Apply an offset to incoming timestamps before output (in nanoseconds)",
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G_MININT64, G_MAXINT64, 0,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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}
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static void
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gst_dvb_sub_enc_init (GstDvbSubEnc * enc)
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{
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GstPadTemplate *tmpl;
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enc->sinkpad = gst_pad_new_from_static_template (&sink_template, "sink");
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gst_pad_set_chain_function (enc->sinkpad,
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GST_DEBUG_FUNCPTR (gst_dvb_sub_enc_chain));
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gst_pad_set_event_function (enc->sinkpad,
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GST_DEBUG_FUNCPTR (gst_dvb_sub_enc_sink_event));
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gst_element_add_pad (GST_ELEMENT (enc), enc->sinkpad);
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tmpl = gst_static_pad_template_get (&src_template);
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enc->srcpad = gst_pad_new_from_template (tmpl, "src");
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gst_pad_set_event_function (enc->srcpad,
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GST_DEBUG_FUNCPTR (gst_dvb_sub_enc_src_event));
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gst_pad_use_fixed_caps (enc->srcpad);
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gst_object_unref (tmpl);
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gst_element_add_pad (GST_ELEMENT (enc), enc->srcpad);
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enc->max_colours = DEFAULT_MAX_COLOURS;
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enc->ts_offset = DEFAULT_TS_OFFSET;
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enc->current_end_time = GST_CLOCK_TIME_NONE;
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}
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static void
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gst_dvb_sub_enc_finalize (GObject * gobject)
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{
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//GstDvbSubEnc *enc = GST_DVB_SUB_ENC (gobject);
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G_OBJECT_CLASS (parent_class)->finalize (gobject);
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}
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static void
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gst_dvb_sub_enc_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstDvbSubEnc *enc = GST_DVB_SUB_ENC (object);
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switch (prop_id) {
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case PROP_MAX_COLOURS:
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g_value_set_int (value, enc->max_colours);
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break;
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case PROP_TS_OFFSET:
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g_value_set_int64 (value, enc->ts_offset);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_dvb_sub_enc_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstDvbSubEnc *enc = GST_DVB_SUB_ENC (object);
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switch (prop_id) {
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case PROP_MAX_COLOURS:
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enc->max_colours = g_value_get_int (value);
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break;
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case PROP_TS_OFFSET:
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enc->ts_offset = g_value_get_int64 (value);
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gst_pad_set_offset (enc->srcpad, enc->ts_offset);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static gboolean
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gst_dvb_sub_enc_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
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{
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gboolean res = FALSE;
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switch (GST_EVENT_TYPE (event)) {
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default:
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res = gst_pad_event_default (pad, parent, event);
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break;
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}
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return res;
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}
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static void
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find_largest_subregion (guint8 * pixels, guint stride, guint pixel_stride,
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gint width, gint height, guint * out_left, guint * out_right,
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guint * out_top, guint * out_bottom)
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{
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guint left = width, right = 0, top = height, bottom = 0;
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gint y, x;
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guint8 *p = pixels;
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for (y = 0; y < height; y++) {
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gboolean visible_pixels = FALSE;
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guint8 *l = p;
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guint8 *r = p + (width - 1) * pixel_stride;
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for (x = 0; x < width; x++) {
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/* AYUV data = byte 0 = A */
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if (l[0] != 0) {
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visible_pixels = TRUE;
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left = MIN (left, x);
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}
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if (r[0] != 0) {
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visible_pixels = TRUE;
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right = MAX (right, width - 1 - x);
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}
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l += pixel_stride;
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r -= pixel_stride;
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if (l >= r) /* Stop when we've scanned to the middle */
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break;
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}
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if (visible_pixels) {
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if (top > y)
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top = y;
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if (bottom < y)
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bottom = y;
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}
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p += stride;
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}
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*out_left = left;
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*out_right = right;
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*out_top = top;
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*out_bottom = bottom;
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}
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/* Create and map a new buffer containing the indicated subregion of the input
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* image, returning the result in the 'out' GstVideoFrame */
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static gboolean
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create_cropped_frame (GstDvbSubEnc * enc, GstVideoFrame * in,
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GstVideoFrame * out, guint x, guint y, guint width, guint height)
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{
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GstBuffer *cropped_buffer;
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GstVideoInfo cropped_info;
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guint8 *out_pixels, *in_pixels;
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guint out_stride, in_stride, p_stride;
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guint bottom = y + height;
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g_return_val_if_fail (GST_VIDEO_INFO_FORMAT (&in->info) ==
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GST_VIDEO_FORMAT_AYUV, FALSE);
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gst_video_info_set_format (&cropped_info, GST_VIDEO_INFO_FORMAT (&in->info),
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width, height);
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cropped_buffer =
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gst_buffer_new_allocate (NULL, GST_VIDEO_INFO_SIZE (&cropped_info), NULL);
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if (!gst_video_frame_map (out, &cropped_info, cropped_buffer, GST_MAP_WRITE)) {
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gst_buffer_unref (cropped_buffer);
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return FALSE;
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}
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p_stride = GST_VIDEO_FRAME_COMP_PSTRIDE (in, 0);
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in_stride = GST_VIDEO_FRAME_PLANE_STRIDE (in, 0);
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in_pixels = GST_VIDEO_FRAME_PLANE_DATA (in, 0);
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out_stride = GST_VIDEO_FRAME_PLANE_STRIDE (out, 0);
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out_pixels = GST_VIDEO_FRAME_PLANE_DATA (out, 0);
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in_pixels += y * in_stride + x * p_stride;
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while (y < bottom) {
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memcpy (out_pixels, in_pixels, width * p_stride);
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in_pixels += in_stride;
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out_pixels += out_stride;
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y++;
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}
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/* By mapping the video frame no ref, it takes ownership of the buffer and it will be released
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* on unmap (if the map call succeeds) */
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gst_video_frame_unmap (out);
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if (!gst_video_frame_map (out, &cropped_info, cropped_buffer,
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GST_MAP_READ | GST_VIDEO_FRAME_MAP_FLAG_NO_REF)) {
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gst_buffer_unref (cropped_buffer);
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return FALSE;
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}
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return TRUE;
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}
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static GstFlowReturn
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process_largest_subregion (GstDvbSubEnc * enc, GstVideoFrame * vframe)
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{
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GstFlowReturn ret = GST_FLOW_ERROR;
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guint8 *pixels = GST_VIDEO_FRAME_PLANE_DATA (vframe, 0);
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guint stride = GST_VIDEO_FRAME_PLANE_STRIDE (vframe, 0);
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guint pixel_stride = GST_VIDEO_FRAME_COMP_PSTRIDE (vframe, 0);
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guint left, right, top, bottom;
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GstBuffer *ayuv8p_buffer;
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GstVideoInfo ayuv8p_info;
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GstVideoFrame cropped_frame, ayuv8p_frame;
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guint32 num_colours;
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GstClockTime end_ts = GST_CLOCK_TIME_NONE, duration;
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find_largest_subregion (pixels, stride, pixel_stride, enc->in_info.width,
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enc->in_info.height, &left, &right, &top, &bottom);
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GST_LOG_OBJECT (enc, "Found subregion %u,%u -> %u,%u w %u, %u", left, top,
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right, bottom, right - left + 1, bottom - top + 1);
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if (!create_cropped_frame (enc, vframe, &cropped_frame, left, top,
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right - left + 1, bottom - top + 1)) {
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GST_WARNING_OBJECT (enc, "Failed to map frame conversion input buffer");
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goto fail;
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}
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/* FIXME: RGB8P is the same size as what we're building, so this is fine,
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* but it'd be better if we had an explicit paletted format for YUV8P */
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gst_video_info_set_format (&ayuv8p_info, GST_VIDEO_FORMAT_RGB8P,
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right - left + 1, bottom - top + 1);
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ayuv8p_buffer =
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gst_buffer_new_allocate (NULL, GST_VIDEO_INFO_SIZE (&ayuv8p_info), NULL);
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/* Mapped without extra ref - the frame now owns the only ref */
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if (!gst_video_frame_map (&ayuv8p_frame, &ayuv8p_info, ayuv8p_buffer,
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GST_MAP_WRITE | GST_VIDEO_FRAME_MAP_FLAG_NO_REF)) {
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GST_WARNING_OBJECT (enc, "Failed to map frame conversion output buffer");
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gst_video_frame_unmap (&cropped_frame);
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gst_buffer_unref (ayuv8p_buffer);
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goto fail;
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}
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if (!gst_dvbsubenc_ayuv_to_ayuv8p (&cropped_frame, &ayuv8p_frame,
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enc->max_colours, &num_colours)) {
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GST_ERROR_OBJECT (enc,
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"Failed to convert subpicture region to paletted 8-bit");
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gst_video_frame_unmap (&cropped_frame);
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gst_video_frame_unmap (&ayuv8p_frame);
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goto skip;
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}
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gst_video_frame_unmap (&cropped_frame);
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|
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duration = GST_BUFFER_DURATION (vframe->buffer);
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|
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if (GST_CLOCK_TIME_IS_VALID (duration)) {
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end_ts = GST_BUFFER_PTS (vframe->buffer);
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if (GST_CLOCK_TIME_IS_VALID (end_ts)) {
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end_ts += duration;
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}
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}
|
|
|
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/* Encode output buffer and push it */
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{
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SubpictureRect s;
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GstBuffer *packet;
|
|
|
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s.frame = &ayuv8p_frame;
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s.nb_colours = num_colours;
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s.x = left;
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s.y = top;
|
|
|
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packet =
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gst_dvbenc_encode (enc->object_version & 0xF, 1, enc->display_version,
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enc->in_info.width, enc->in_info.height, &s, 1);
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if (packet == NULL) {
|
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gst_video_frame_unmap (&ayuv8p_frame);
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goto fail;
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}
|
|
|
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enc->object_version++;
|
|
|
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gst_buffer_copy_into (packet, vframe->buffer, GST_BUFFER_COPY_METADATA, 0,
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-1);
|
|
|
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if (!GST_BUFFER_DTS_IS_VALID (packet))
|
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GST_BUFFER_DTS (packet) = GST_BUFFER_PTS (packet);
|
|
|
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ret = gst_pad_push (enc->srcpad, packet);
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}
|
|
|
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if (GST_CLOCK_TIME_IS_VALID (end_ts)) {
|
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GST_LOG_OBJECT (enc, "Scheduling subtitle end packet for %" GST_TIME_FORMAT,
|
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GST_TIME_ARGS (end_ts));
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enc->current_end_time = end_ts;
|
|
}
|
|
|
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gst_video_frame_unmap (&ayuv8p_frame);
|
|
|
|
return ret;
|
|
skip:
|
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return GST_FLOW_OK;
|
|
fail:
|
|
return GST_FLOW_ERROR;
|
|
}
|
|
|
|
static GstFlowReturn
|
|
gst_dvb_sub_enc_generate_end_packet (GstDvbSubEnc * enc, GstClockTime pts)
|
|
{
|
|
GstBuffer *packet;
|
|
GstFlowReturn ret;
|
|
|
|
if (!GST_CLOCK_TIME_IS_VALID (enc->current_end_time))
|
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return GST_FLOW_OK;
|
|
|
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if (enc->current_end_time >= pts)
|
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return GST_FLOW_OK; /* Didn't hit the end of the current subtitle yet */
|
|
|
|
GST_DEBUG_OBJECT (enc, "Outputting end of page at TS %" GST_TIME_FORMAT,
|
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GST_TIME_ARGS (enc->current_end_time));
|
|
|
|
packet =
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|
gst_dvbenc_encode (enc->object_version & 0xF, 1, enc->display_version,
|
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enc->in_info.width, enc->in_info.height, NULL, 0);
|
|
if (packet == NULL) {
|
|
GST_ELEMENT_ERROR (enc, STREAM, FAILED,
|
|
("Internal data stream error."),
|
|
("Failed to encode end of subtitle packet"));
|
|
return GST_FLOW_ERROR;
|
|
}
|
|
|
|
enc->object_version++;
|
|
|
|
GST_BUFFER_DTS (packet) = GST_BUFFER_PTS (packet) = enc->current_end_time;
|
|
enc->current_end_time = GST_CLOCK_TIME_NONE;
|
|
|
|
ret = gst_pad_push (enc->srcpad, packet);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static GstFlowReturn
|
|
gst_dvb_sub_enc_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
|
|
{
|
|
GstFlowReturn ret = GST_FLOW_OK;
|
|
GstDvbSubEnc *enc = GST_DVB_SUB_ENC (parent);
|
|
GstVideoFrame vframe;
|
|
GstClockTime pts = GST_BUFFER_PTS (buf);
|
|
|
|
GST_DEBUG_OBJECT (enc, "Have buffer of size %" G_GSIZE_FORMAT ", ts %"
|
|
GST_TIME_FORMAT ", dur %" G_GINT64_FORMAT, gst_buffer_get_size (buf),
|
|
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)), GST_BUFFER_DURATION (buf));
|
|
|
|
if (GST_CLOCK_TIME_IS_VALID (pts)) {
|
|
ret = gst_dvb_sub_enc_generate_end_packet (enc, pts);
|
|
if (ret != GST_FLOW_OK)
|
|
goto fail;
|
|
}
|
|
|
|
/* FIXME: Allow GstVideoOverlayComposition input, so we can directly encode the
|
|
* overlays passed */
|
|
|
|
/* Scan the input buffer for regions to encode */
|
|
/* FIXME: Could use the blob extents tracking code from OpenHMD here to collect
|
|
* multiple regions*/
|
|
if (!gst_video_frame_map (&vframe, &enc->in_info, buf, GST_MAP_READ)) {
|
|
GST_ERROR_OBJECT (enc, "Failed to map input buffer for reading");
|
|
ret = GST_FLOW_ERROR;
|
|
goto fail;
|
|
}
|
|
|
|
ret = process_largest_subregion (enc, &vframe);
|
|
gst_video_frame_unmap (&vframe);
|
|
|
|
fail:
|
|
gst_buffer_unref (buf);
|
|
return ret;
|
|
}
|
|
|
|
static gboolean
|
|
gst_dvb_sub_enc_sink_setcaps (GstPad * pad, GstCaps * caps)
|
|
{
|
|
GstDvbSubEnc *enc = GST_DVB_SUB_ENC (gst_pad_get_parent (pad));
|
|
gboolean ret = FALSE;
|
|
GstVideoInfo in_info;
|
|
GstCaps *out_caps = NULL;
|
|
|
|
GST_DEBUG_OBJECT (enc, "setcaps called with %" GST_PTR_FORMAT, caps);
|
|
if (!gst_video_info_from_caps (&in_info, caps)) {
|
|
GST_ERROR_OBJECT (enc, "Failed to parse input caps");
|
|
return FALSE;
|
|
}
|
|
|
|
if (!enc->in_info.finfo || !gst_video_info_is_equal (&in_info, &enc->in_info)) {
|
|
enc->in_info = in_info;
|
|
enc->display_version++;
|
|
|
|
out_caps = gst_caps_new_simple ("subpicture/x-dvb",
|
|
"width", G_TYPE_INT, enc->in_info.width,
|
|
"height", G_TYPE_INT, enc->in_info.height,
|
|
"framerate", GST_TYPE_FRACTION, enc->in_info.fps_n, enc->in_info.fps_d,
|
|
NULL);
|
|
|
|
if (!gst_pad_set_caps (enc->srcpad, out_caps)) {
|
|
GST_WARNING_OBJECT (enc, "failed setting downstream caps");
|
|
gst_caps_unref (out_caps);
|
|
goto beach;
|
|
}
|
|
|
|
gst_caps_unref (out_caps);
|
|
}
|
|
|
|
ret = TRUE;
|
|
|
|
beach:
|
|
gst_object_unref (enc);
|
|
return ret;
|
|
}
|
|
|
|
static gboolean
|
|
gst_dvb_sub_enc_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
|
|
{
|
|
GstDvbSubEnc *enc = GST_DVB_SUB_ENC (parent);
|
|
gboolean ret = FALSE;
|
|
|
|
GST_LOG_OBJECT (enc, "%s event", GST_EVENT_TYPE_NAME (event));
|
|
|
|
switch (GST_EVENT_TYPE (event)) {
|
|
case GST_EVENT_CAPS:
|
|
{
|
|
GstCaps *caps;
|
|
|
|
gst_event_parse_caps (event, &caps);
|
|
ret = gst_dvb_sub_enc_sink_setcaps (pad, caps);
|
|
gst_event_unref (event);
|
|
break;
|
|
}
|
|
case GST_EVENT_GAP:
|
|
{
|
|
if (!GST_CLOCK_TIME_IS_VALID (enc->current_end_time)) {
|
|
ret = gst_pad_event_default (pad, parent, event);
|
|
} else {
|
|
GstClockTime start, duration;
|
|
|
|
gst_event_parse_gap (event, &start, &duration);
|
|
|
|
if (GST_CLOCK_TIME_IS_VALID (start)) {
|
|
if (GST_CLOCK_TIME_IS_VALID (duration))
|
|
start += duration;
|
|
/* we do not expect another buffer until after gap,
|
|
* so that is our position now */
|
|
GST_DEBUG_OBJECT (enc,
|
|
"Got GAP event, advancing time to %" GST_TIME_FORMAT,
|
|
GST_TIME_ARGS (start));
|
|
gst_dvb_sub_enc_generate_end_packet (enc, start);
|
|
} else {
|
|
GST_WARNING_OBJECT (enc, "Got GAP event with invalid position");
|
|
}
|
|
|
|
gst_event_unref (event);
|
|
ret = TRUE;
|
|
}
|
|
break;
|
|
}
|
|
case GST_EVENT_SEGMENT:
|
|
{
|
|
GstSegment seg;
|
|
|
|
gst_event_copy_segment (event, &seg);
|
|
|
|
ret = gst_pad_event_default (pad, parent, event);
|
|
break;
|
|
}
|
|
case GST_EVENT_FLUSH_STOP:{
|
|
enc->current_end_time = GST_CLOCK_TIME_NONE;
|
|
|
|
ret = gst_pad_event_default (pad, parent, event);
|
|
break;
|
|
}
|
|
default:{
|
|
ret = gst_pad_event_default (pad, parent, event);
|
|
break;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static gboolean
|
|
plugin_init (GstPlugin * plugin)
|
|
{
|
|
return GST_ELEMENT_REGISTER (dvbsubenc, plugin);
|
|
}
|
|
|
|
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
|
|
GST_VERSION_MINOR,
|
|
dvbsubenc,
|
|
"DVB subtitle parser and encoder", plugin_init,
|
|
VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN);
|