filter: added Filter class

Clement Champetier · Clement Champetier · commit d441d2562fb2 · 2016-01-21T16:43:49.000+01:00
Describe a filter and its options.
diff --git a/src/AvTranscoder/filter/Filter.cpp b/src/AvTranscoder/filter/Filter.cpp
@@ -0,0 +1,37 @@
+#include "Filter.hpp"
+
+extern "C" {
+#include <libavfilter/avfilter.h>
+}
+
+#include <stdexcept>
+
+namespace avtranscoder
+{
+
+Filter::Filter(const std::string& name, const std::string& options, const std::string& instanceName)
+    : _filter(NULL)
+    , _context(NULL)
+    , _options(options)
+    , _instanceName(instanceName.empty() ? name : instanceName)
+{
+    _filter = avfilter_get_by_name(name.c_str());
+    if(!_filter)
+    {
+        std::string msg("Cannot find filter ");
+        msg += name;
+        msg += ". It will not be added to the filter graph.";
+        throw std::runtime_error(msg);
+    }
+}
+
+Filter::~Filter()
+{
+    avfilter_free(_context);
+}
+
+std::string Filter::getName() const
+{
+    return _filter->name ? std::string(_filter->name) : "";
+}
+}
diff --git a/src/AvTranscoder/filter/Filter.hpp b/src/AvTranscoder/filter/Filter.hpp
@@ -0,0 +1,40 @@
+#ifndef _AV_TRANSCODER_FILTER_FILTER_HPP_
+#define _AV_TRANSCODER_FILTER_FILTER_HPP_
+
+#include <AvTranscoder/common.hpp>
+
+struct AVFilter;
+struct AVFilterContext;
+
+namespace avtranscoder
+{
+
+/**
+ * @brief Describe a filter and its options.
+ **/
+class AvExport Filter
+{
+public:
+    Filter(const std::string& name, const std::string& options = "", const std::string& instanceName = "");
+    ~Filter();
+
+    std::string getName() const;
+    std::string getOptions() const { return _options; }
+    std::string getInstanceName() const { return _instanceName; }
+
+#ifndef SWIG
+    AVFilter& getAVFilter() { return *_filter; }
+    AVFilterContext* getAVFilterContext() { return _context; }
+
+    void setAVFilterContext(AVFilterContext* newContext) { _context = newContext; }
+#endif
+
+private:
+    AVFilter* _filter;
+    AVFilterContext* _context;
+    std::string _options;
+    std::string _instanceName;
+};
+}
+
+#endif
