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subprojects/gst-plugins-base/gst/encoding/gstencodebin.c

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+/* GStreamer encoding bin
+ * Copyright (C) 2009 Edward Hervey <edward.hervey@collabora.co.uk>
+ *           (C) 2009 Nokia Corporation
+ * Copyright (C) 2020 Thibault Saunier <tsaunier@igalia.com>
+ *           (C) 2020 Igalia S.L
+ *
+ * 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-encodebin
+ * @title: encodebin
+ *
+ * EncodeBin provides a bin for encoding/muxing various streams according to
+ * a specified #GstEncodingProfile.
+ *
+ * Based on the profile that was set (via the #GstEncodeBaseBin:profile property),
+ * EncodeBin will internally select and configure the required elements
+ * (encoders, muxers, but also audio and video converters) so that you can
+ * provide it raw or pre-encoded streams of data in input and have your
+ * encoded/muxed/converted stream in output.
+ *
+ * ## Features
+ *
+ * * Automatic encoder and muxer selection based on elements available on the
+ * system.
+ *
+ * * Conversion of raw audio/video streams (scaling, framerate conversion,
+ * colorspace conversion, samplerate conversion) to conform to the profile
+ * output format.
+ *
+ * * Variable number of streams. If the presence property for a stream encoding
+ * profile is 0, you can request any number of sink pads for it via the
+ * standard request pad gstreamer API or the #GstEncodeBaseBin::request-pad action
+ * signal.
+ *
+ * * Avoid reencoding (passthrough). If the input stream is already encoded and is
+ * compatible with what the #GstEncodingProfile expects, then the stream won't
+ * be re-encoded but just passed through downstream to the muxer or the output.
+ *
+ * * Mix pre-encoded and raw streams as input. In addition to the passthrough
+ * feature above, you can feed both raw audio/video *AND* already-encoded data
+ * to a pad. #GstEncodeBaseBin will take care of passing through the compatible
+ * segments and re-encoding the segments of media that need encoding.
+ *
+ * * Standard behaviour is to use a #GstEncodingContainerProfile to have both
+ * encoding and muxing performed. But you can also provide a single stream
+ * profile (like #GstEncodingAudioProfile) to only have the encoding done and
+ * handle the encoded output yourself.
+ *
+ * * Audio imperfection corrections. Incoming audio streams can have non perfect
+ * timestamps (jitter), like the streams coming from ASF files. #GstEncodeBaseBin
+ * will automatically fix those imperfections for you. See
+ * #GstEncodeBaseBin:audio-jitter-tolerance for more details.
+ *
+ * * Variable or Constant video framerate. If your #GstEncodingVideoProfile has
+ * the variableframerate property deactivated (default), then the incoming
+ * raw video stream will be retimestampped in order to produce a constant
+ * framerate.
+ *
+ * * Cross-boundary re-encoding. When feeding compatible pre-encoded streams that
+ * fall on segment boundaries, and for supported formats (right now only H263),
+ * the GOP will be decoded/reencoded when needed to produce an encoded output
+ * that fits exactly within the request GstSegment.
+ *
+ * * Missing plugin support. If a #GstElement is missing to encode/mux to the
+ * request profile formats, a missing-plugin #GstMessage will be posted on the
+ * #GstBus, allowing systems that support the missing-plugin system to offer the
+ * user a way to install the missing element.
+ *
+ */
+
+#include "gstencodingelements.h"
+#include "gstencodebin.h"
+
+struct _GstEncodeBin
+{
+  GstEncodeBaseBin parent;
+};
+
+G_DEFINE_TYPE (GstEncodeBin, gst_encode_bin, GST_TYPE_ENCODE_BASE_BIN);
+GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (encodebin, "encodebin", GST_RANK_NONE,
+    gst_encode_bin_get_type (), encoding_element_init (plugin));
+
+static GstStaticPadTemplate muxer_src_template =
+GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
+    GST_STATIC_CAPS_ANY);
+
+static void
+gst_encode_bin_class_init (GstEncodeBinClass * klass)
+{
+  GstElementClass *gstelement_klass = (GstElementClass *) klass;
+
+  gst_element_class_add_static_pad_template (gstelement_klass,
+      &muxer_src_template);
+
+  gst_element_class_set_static_metadata (gstelement_klass,
+      "Encoder Bin",
+      "Generic/Bin/Encoder",
+      "Convenience encoding/muxing element",
+      "Edward Hervey <edward.hervey@collabora.co.uk>");
+}
+
+static void
+gst_encode_bin_init (GstEncodeBin * encode_bin)
+{
+  GstEncodeBaseBin *encode_base_bin = (GstEncodeBaseBin *) (encode_bin);
+  GstPadTemplate *tmpl;
+
+  tmpl = gst_static_pad_template_get (&muxer_src_template);
+
+  encode_base_bin->srcpad =
+      gst_ghost_pad_new_no_target_from_template ("src", tmpl);
+  gst_object_unref (tmpl);
+  gst_pad_set_active (encode_base_bin->srcpad, TRUE);
+  gst_element_add_pad (GST_ELEMENT_CAST (encode_base_bin),
+      encode_base_bin->srcpad);
+}