surround_return.h

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/*
 * Copyright (C) 2023 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2023 Robin Gareus <robin@gareus.org>
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#pragma once
 
#ifdef HAVE_LV2_1_18_6
#include <lv2/atom/atom.h>
#include <lv2/atom/forge.h>
#else
#include <lv2/lv2plug.in/ns/ext/atom/atom.h>
#include <lv2/lv2plug.in/ns/ext/atom/forge.h>
#endif
 
#ifdef __APPLE__
#include <CoreServices/CoreServices.h>
#include <CoreAudio/CoreAudio.h>
#include <AudioUnit/AudioUnit.h>
#endif
 
#include "ardour/chan_mapping.h"
#include "ardour/fixed_delay.h"
#include "ardour/lufs_meter.h"
#include "ardour/monitor_processor.h"
#include "ardour/processor.h"
 
namespace ARDOUR
{
class Amp;
class Session;
class SurroundSend;
class SurroundPannable;
class LV2Plugin;
 
class LIBARDOUR_API SurroundReturn : public Processor
{
public:
        SurroundReturn (Session&, Route*);
        virtual ~SurroundReturn ();
 
        bool can_support_io_configuration (const ChanCount& in, ChanCount& out);
        void run (BufferSet& bufs, samplepos_t start_sample, samplepos_t end_sample, double speed, pframes_t nframes, bool);
        int  set_block_size (pframes_t);
        void flush ();
        void set_playback_offset (samplecnt_t cnt);
        bool display_to_user () const { return false; }
 
        void setup_export (std::string const&, samplepos_t, samplepos_t);
        void finalize_export ();
 
        size_t n_channels () const {
                return _current_n_channels;
        }
 
        size_t total_n_channels (bool with_beds = true) const {
                return _total_n_channels - (with_beds ? 0 : 10);
        }
 
        std::shared_ptr<LV2Plugin> surround_processor () const {
                return _surround_processor;
        }
 
        bool have_au_renderer () const {
                return _have_au_renderer;
        }
 
        bool load_au_preset (size_t);
        bool set_au_param (size_t, float);
 
        std::shared_ptr<PBD::Controllable> binaural_render_controllable () const {
                return _binaural_render_control;
        }
 
        enum MainOutputFormat {
                OUTPUT_FORMAT_5_1 = 2,
                OUTPUT_FORMAT_7_1_4 = 6
        };
 
        MainOutputFormat output_format () const {
                return _current_output_format;
        }
 
        std::shared_ptr<PBD::Controllable> output_format_controllable () const {
                return _output_format_control;
        }
 
        /* a value <= -200 indicates that no data is available */
        float integrated_loudness () const;
        float max_momentary () const;
        float momentary () const;
        float max_dbtp () const;
 
        samplecnt_t signal_latency () const;
 
        /* XXX this is only for testing */
        void set_bed_mix (bool on, std::string const& ref, int* cmap = NULL);
        void set_sync_and_align (bool on);
        void set_ffoa (float);
        void set_with_all_metadata (bool);
 
        int set_state (XMLNode const&, int version);
 
protected:
        XMLNode& state () const;
 
private:
        static const size_t max_object_id = 128; // happens to be the same as a constant in a well known surround system
        static const size_t num_pan_parameters = 8; // X, Y, Z, Size, Snap [ElevEn, Ramp, Zones]
 
        void forge_int_msg (uint32_t obj_id, uint32_t key, int val, uint32_t key2 = 0, int val2 = 0);
        void maybe_send_metadata (size_t id, pframes_t frame, pan_t const v[num_pan_parameters], bool force = false);
        void evaluate (size_t id, std::shared_ptr<SurroundPannable> const&, timepos_t const& , pframes_t, bool force = false);
 
        void reset_object_map ();
        void latency_changed ();
 
        std::shared_ptr<LV2Plugin> _surround_processor;
 
        LUFSMeter _lufs_meter;
 
        std::shared_ptr<Amp> _trim;
 
        class OutputFormatControl : public MPControl<bool>
        {
        public:
                OutputFormatControl (bool v, std::string const& n, PBD::Controllable::Flag f);
                virtual std::string get_user_string () const;
        };
 
        std::shared_ptr<OutputFormatControl> _output_format_control;
 
        class BinauralRenderControl : public MPControl<bool>
        {
        public:
                BinauralRenderControl (bool v, std::string const& n, PBD::Controllable::Flag f);
                virtual std::string get_user_string () const;
        };
 
        std::shared_ptr<BinauralRenderControl> _binaural_render_control;
 
#ifdef __APPLE__
        ::AudioUnit      _au;
        AudioBufferList* _au_buffers;
        samplecnt_t      _au_samples_processed;
        float*           _au_data[12];
 
        struct LIBARDOUR_API AUParameter {
                AudioUnitParameterID id;
                AudioUnitScope scope;
                AudioUnitElement element;
                std::string label;
                float lower, upper, normal;
        };
 
        std::vector<AUParameter> _au_params;
        std::vector<AUPreset>    _au_presets;
 
        static OSStatus _render_callback(void*, AudioUnitRenderActionFlags*, const AudioTimeStamp*, UInt32, UInt32, AudioBufferList*);
        OSStatus render_callback(AudioUnitRenderActionFlags*, const AudioTimeStamp*, UInt32, UInt32, AudioBufferList*);
#endif
 
        bool             _have_au_renderer;
        LV2_Atom_Forge   _forge;
        uint8_t          _atom_buf[8192];
        pan_t            _current_value[max_object_id][num_pan_parameters];
        int              _current_render_mode[max_object_id];
        size_t           _channel_id_map[max_object_id];
        size_t           _current_n_channels;
        size_t           _total_n_channels;
        MainOutputFormat _current_output_format;
        BufferSet        _surround_bufs;
        ChanMapping      _in_map;
        ChanMapping      _out_map;
        bool             _exporting;
        samplepos_t      _export_start;
        samplepos_t      _export_end;
        bool             _rolling;
        bool             _with_bed;
        bool             _sync_and_align;
        bool             _with_all_metadata;
        bool             _content_creation;
        float            _ffoa;
        std::string      _export_reference;
        FixedDelay       _delaybuffers;
        std::atomic<int> _flush;
};
 
} // namespace ARDOUR