Missing files.

diff --git a/src/lib/audio_filter_graph.cc b/src/lib/audio_filter_graph.cc
new file mode 100644 (file)
index 0000000..0035fb2
--- /dev/null
+++ b/src/lib/audio_filter_graph.cc
@@ -0,0 +1,135 @@
+/*
+    Copyright (C) 2015 Carl Hetherington <cth@carlh.net>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program 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 General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include "audio_filter_graph.h"
+#include "audio_buffers.h"
+#include "compose.hpp"
+extern "C" {
+#include <libavfilter/buffersink.h>
+#include <libavfilter/buffersrc.h>
+}
+
+#include "i18n.h"
+
+using std::string;
+using std::cout;
+using boost::shared_ptr;
+
+AudioFilterGraph::AudioFilterGraph (int sample_rate, int64_t channel_layout)
+       : _sample_rate (sample_rate)
+       , _channel_layout (channel_layout)
+{
+       _in_frame = av_frame_alloc ();
+}
+
+AudioFilterGraph::~AudioFilterGraph()
+{
+       if (_in_frame) {
+               av_frame_free (&_in_frame);
+       }
+}
+
+string
+AudioFilterGraph::src_parameters () const
+{
+       SafeStringStream a;
+
+       char buffer[64];
+       av_get_channel_layout_string (buffer, sizeof(buffer), 0, _channel_layout);
+
+       a << "time_base=1/1:sample_rate=" << _sample_rate << ":"
+         << "sample_fmt=" << av_get_sample_fmt_name(AV_SAMPLE_FMT_FLTP) << ":"
+         << "channel_layout=" << buffer;
+
+       return a.str ();
+}
+
+void *
+AudioFilterGraph::sink_parameters () const
+{
+       AVABufferSinkParams* sink_params = av_abuffersink_params_alloc ();
+
+       AVSampleFormat* sample_fmts = new AVSampleFormat[2];
+       sample_fmts[0] = AV_SAMPLE_FMT_FLTP;
+       sample_fmts[1] = AV_SAMPLE_FMT_NONE;
+       sink_params->sample_fmts = sample_fmts;
+
+       int64_t* channel_layouts = new int64_t[2];
+       channel_layouts[0] = _channel_layout;
+       channel_layouts[1] = -1;
+       sink_params->channel_layouts = channel_layouts;
+
+       sink_params->sample_rates = new int[2];
+       sink_params->sample_rates[0] = _sample_rate;
+       sink_params->sample_rates[1] = -1;
+
+       return sink_params;
+}
+
+string
+AudioFilterGraph::src_name () const
+{
+       return "abuffer";
+}
+
+string
+AudioFilterGraph::sink_name () const
+{
+       return "abuffersink";
+}
+
+void
+AudioFilterGraph::process (shared_ptr<const AudioBuffers> buffers)
+{
+       _in_frame->extended_data = new uint8_t*[buffers->channels()];
+       for (int i = 0; i < buffers->channels(); ++i) {
+               if (i < AV_NUM_DATA_POINTERS) {
+                       _in_frame->data[i] = reinterpret_cast<uint8_t*> (buffers->data(i));
+               }
+               _in_frame->extended_data[i] = reinterpret_cast<uint8_t*> (buffers->data(i));
+       }
+
+       _in_frame->nb_samples = buffers->frames ();
+       _in_frame->format = AV_SAMPLE_FMT_FLTP;
+       _in_frame->sample_rate = _sample_rate;
+       _in_frame->channel_layout = _channel_layout;
+       _in_frame->channels = av_get_channel_layout_nb_channels (_channel_layout);
+
+       int r = av_buffersrc_write_frame (_buffer_src_context, _in_frame);
+
+       delete[] _in_frame->extended_data;
+
+       if (r < 0) {
+               char buffer[256];
+               av_strerror (r, buffer, sizeof(buffer));
+               throw DecodeError (String::compose (N_("could not push buffer into filter chain (%1)"), buffer));
+       }
+
+       while (true) {
+               if (av_buffersink_get_frame (_buffer_sink_context, _frame) < 0) {
+                       break;
+               }
+
+               /* We don't extract audio data here, since the only use of this class
+                  is for ebur128.
+               */
+
+               av_frame_unref (_frame);
+       }
+}

diff --git a/src/lib/audio_filter_graph.h b/src/lib/audio_filter_graph.h
new file mode 100644 (file)
index 0000000..8efff5d
--- /dev/null
+++ b/src/lib/audio_filter_graph.h
@@ -0,0 +1,45 @@
+/*
+    Copyright (C) 2015 Carl Hetherington <cth@carlh.net>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program 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 General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include "filter_graph.h"
+extern "C" {
+#include <libavfilter/buffersink.h>
+}
+
+class AudioBuffers;
+
+class AudioFilterGraph : public FilterGraph
+{
+public:
+       AudioFilterGraph (int sample_rate, int64_t channel_layout);
+       ~AudioFilterGraph ();
+
+       void process (boost::shared_ptr<const AudioBuffers> audio);
+
+protected:
+       std::string src_parameters () const;
+       std::string src_name () const;
+       void* sink_parameters () const;
+       std::string sink_name () const;
+
+private:
+       int _sample_rate;
+       int64_t _channel_layout;
+       AVFrame* _in_frame;
+};