GStreamer: Implement fetching audio/video codecs by container

Moved stream types to QGstCodecsInfo and added possibility to fetch audio
or video codecs by a container. Or fetch containers by audio or video codec.

It would allow to debug supported codecs and containers:

QGstCodecsInfo containers(QGstCodecsInfo::Muxer);
QGstCodecsInfo audioCodecs(QGstCodecsInfo::AudioEncoder);
for (auto &container: containers.supportedCodecs())
    qDebug() << audioCodecs.supportedCodecs(containers.supportedStreamTypes(container));

Change-Id: I26bf5579db6974a166d408c4865a9ffe314e3e15
Reviewed-by: Andy Shaw <andy.shaw@qt.io>

6 files changed, 3 insertions, 64 deletions

diff --git a/src/plugins/gstreamer/mediacapture/qgstreameraudioencode.cpp b/src/plugins/gstreamer/mediacapture/qgstreameraudioencode.cpp
index 40294214a..6a0816343 100644
--- a/src/plugins/gstreamer/mediacapture/qgstreameraudioencode.cpp
+++ b/src/plugins/gstreamer/mediacapture/qgstreameraudioencode.cpp
@@ -50,16 +50,6 @@ QGstreamerAudioEncode::QGstreamerAudioEncode(QObject *parent)
     :QAudioEncoderSettingsControl(parent)
     , m_codecs(QGstCodecsInfo::AudioEncoder)
 {
-    for (const QString& codecName : m_codecs.supportedCodecs()) {
-        GstElementFactory *factory = gst_element_factory_find(m_codecs.codecElement(codecName).constData());
-
-        if (factory) {
-            m_streamTypes.insert(codecName,
-                                 QGstreamerMediaContainerControl::supportedStreamTypes(factory, GST_PAD_SRC));
-
-            gst_object_unref(GST_OBJECT(factory));
-        }
-    }
 }
 
 QGstreamerAudioEncode::~QGstreamerAudioEncode()
@@ -247,5 +237,5 @@ GstElement *QGstreamerAudioEncode::createEncoder()
 
 QSet<QString> QGstreamerAudioEncode::supportedStreamTypes(const QString &codecName) const
 {
-    return m_streamTypes.value(codecName);
+    return m_codecs.supportedStreamTypes(codecName);
 }
diff --git a/src/plugins/gstreamer/mediacapture/qgstreameraudioencode.h b/src/plugins/gstreamer/mediacapture/qgstreameraudioencode.h
index 04de602ad..0cfbb4e91 100644
--- a/src/plugins/gstreamer/mediacapture/qgstreameraudioencode.h
+++ b/src/plugins/gstreamer/mediacapture/qgstreameraudioencode.h
@@ -86,8 +86,6 @@ private:
 
     QMap<QString, QMap<QString, QVariant> > m_options;
 
-    QMap<QString, QSet<QString> > m_streamTypes;
-
     QAudioEncoderSettings m_audioSettings;
 };
 
diff --git a/src/plugins/gstreamer/mediacapture/qgstreamermediacontainercontrol.cpp b/src/plugins/gstreamer/mediacapture/qgstreamermediacontainercontrol.cpp
index 05f1c8af5..33351476d 100644
--- a/src/plugins/gstreamer/mediacapture/qgstreamermediacontainercontrol.cpp
+++ b/src/plugins/gstreamer/mediacapture/qgstreamermediacontainercontrol.cpp
@@ -47,47 +47,11 @@ QGstreamerMediaContainerControl::QGstreamerMediaContainerControl(QObject *parent
     :QMediaContainerControl(parent)
     , m_containers(QGstCodecsInfo::Muxer)
 {
-    QSet<QString> allTypes;
-
-    for (const QString& formatName : supportedContainers()) {
-        GstElementFactory *factory = gst_element_factory_find(m_containers.codecElement(formatName).constData());
-        if (factory) {
-            if (formatName == QByteArray("raw")) {
-                m_streamTypes.insert(formatName, allTypes);
-            } else {
-                QSet<QString> types = supportedStreamTypes(factory, GST_PAD_SINK);
-                m_streamTypes.insert(formatName, types);
-                allTypes.unite(types);
-            }
-
-            gst_object_unref(GST_OBJECT(factory));
-        }
-    }
 }
 
-QSet<QString> QGstreamerMediaContainerControl::supportedStreamTypes(GstElementFactory *factory, GstPadDirection direction)
-{
-    QSet<QString> types;
-    const GList *pads = gst_element_factory_get_static_pad_templates(factory);
-    for (const GList *pad = pads; pad; pad = g_list_next(pad)) {
-        GstStaticPadTemplate *templ = (GstStaticPadTemplate*)pad->data;
-        if (templ->direction == direction) {
-            GstCaps *caps = gst_static_caps_get(&templ->static_caps);
-            for (uint i=0; i<gst_caps_get_size(caps); i++) {
-                GstStructure *structure = gst_caps_get_structure(caps, i);
-                types.insert( QString::fromUtf8(gst_structure_get_name(structure)) );
-            }
-            gst_caps_unref(caps);
-        }
-    }
-
-    return types;
-}
-
-
 QSet<QString> QGstreamerMediaContainerControl::supportedStreamTypes(const QString &container) const
 {
-    return m_streamTypes.value(container);
+    return m_containers.supportedStreamTypes(container);
 }
 
 QString QGstreamerMediaContainerControl::containerExtension() const
diff --git a/src/plugins/gstreamer/mediacapture/qgstreamermediacontainercontrol.h b/src/plugins/gstreamer/mediacapture/qgstreamermediacontainercontrol.h
index 5c730b21d..02c7346b1 100644
--- a/src/plugins/gstreamer/mediacapture/qgstreamermediacontainercontrol.h
+++ b/src/plugins/gstreamer/mediacapture/qgstreamermediacontainercontrol.h
@@ -68,14 +68,11 @@ public:
 
     QSet<QString> supportedStreamTypes(const QString &container) const;
 
-    static QSet<QString> supportedStreamTypes(GstElementFactory *factory, GstPadDirection direction);
-
     QString containerExtension() const;
 
 private:
     QString m_format;
     QGstCodecsInfo m_containers;
-    QMap<QString, QSet<QString> > m_streamTypes;
 };
 
 QT_END_NAMESPACE
diff --git a/src/plugins/gstreamer/mediacapture/qgstreamervideoencode.cpp b/src/plugins/gstreamer/mediacapture/qgstreamervideoencode.cpp
index 6b4dbe4b7..62d9bbd8c 100644
--- a/src/plugins/gstreamer/mediacapture/qgstreamervideoencode.cpp
+++ b/src/plugins/gstreamer/mediacapture/qgstreamervideoencode.cpp
@@ -49,15 +49,6 @@ QGstreamerVideoEncode::QGstreamerVideoEncode(QGstreamerCaptureSession *session)
     :QVideoEncoderSettingsControl(session), m_session(session)
     , m_codecs(QGstCodecsInfo::VideoEncoder)
 {
-    for (const QString& codecName : supportedVideoCodecs()) {
-        GstElementFactory *factory = gst_element_factory_find(m_codecs.codecElement(codecName).constData());
-        if (factory) {
-            m_streamTypes.insert(codecName,
-                                 QGstreamerMediaContainerControl::supportedStreamTypes(factory, GST_PAD_SRC));
-
-            gst_object_unref(GST_OBJECT(factory));
-        }
-    }
 }
 
 QGstreamerVideoEncode::~QGstreamerVideoEncode()
@@ -303,5 +294,5 @@ QPair<int,int> QGstreamerVideoEncode::rateAsRational() const
 
 QSet<QString> QGstreamerVideoEncode::supportedStreamTypes(const QString &codecName) const
 {
-    return m_streamTypes.value(codecName);
+    return m_codecs.supportedStreamTypes(codecName);
 }
diff --git a/src/plugins/gstreamer/mediacapture/qgstreamervideoencode.h b/src/plugins/gstreamer/mediacapture/qgstreamervideoencode.h
index bc6636012..a35e2b456 100644
--- a/src/plugins/gstreamer/mediacapture/qgstreamervideoencode.h
+++ b/src/plugins/gstreamer/mediacapture/qgstreamervideoencode.h
@@ -90,7 +90,6 @@ private:
 
     QVideoEncoderSettings m_videoSettings;
     QMap<QString, QMap<QString, QVariant> > m_options;
-    QMap<QString, QSet<QString> > m_streamTypes;
 };
 
 QT_END_NAMESPACE