disk_writer.h

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/*
 * Copyright (C) 2017-2018 Robin Gareus <robin@gareus.org>
 * Copyright (C) 2017 Paul Davis <paul@linuxaudiosystems.com>
 *
 * 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
 
#include <atomic>
#include <list>
#include <vector>
#include <optional>
 
#include "ardour/disk_io.h"
#include "ardour/event_ring_buffer.h"
#include "ardour/midi_buffer.h"
 
namespace ARDOUR
{
class AudioFileSource;
class SMFSource;
class MidiSource;
 
class LIBARDOUR_API DiskWriter : public DiskIOProcessor
{
public:
        DiskWriter (Session&, Track&, std::string const& name,
                    DiskIOProcessor::Flag f = DiskIOProcessor::Flag (0));
        ~DiskWriter ();
 
        bool set_name (std::string const& str);
        std::string display_name () const;
 
        bool recordable () const { return _flags & Recordable; }
 
        static samplecnt_t chunk_samples () { return _chunk_samples; }
        static samplecnt_t default_chunk_samples ();
        static void        set_chunk_samples (samplecnt_t n) { _chunk_samples = n; }
 
        void run (BufferSet& /*bufs*/, samplepos_t /*start_sample*/, samplepos_t /*end_sample*/,
                  double speed, pframes_t /*nframes*/, bool /*result_required*/);
 
        void non_realtime_locate (samplepos_t);
        void realtime_handle_transport_stopped ();
 
        int set_state (const XMLNode&, int version);
 
        bool set_write_source_name (const std::string& str);
 
        std::string write_source_name () const;
 
        std::shared_ptr<AudioFileSource> audio_write_source (uint32_t n = 0) {
                std::shared_ptr<ChannelList const> c = channels.reader ();
                if (n < c->size ()) {
                        return (*c)[n]->write_source;
                }
                return std::shared_ptr<AudioFileSource> ();
        }
 
        std::shared_ptr<SMFSource> midi_write_source () const { return _midi_write_source; }
 
        std::string steal_write_source_name ();
        int use_new_write_source (DataType, uint32_t n = 0);
        void reset_write_sources (bool mark_write_complete);
 
        AlignStyle alignment_style () const { return _alignment_style; }
        void       set_align_style (AlignStyle, bool force = false);
 
        PBD::Signal<void()> AlignmentStyleChanged;
 
        bool configure_io (ChanCount in, ChanCount out);
 
        std::list<std::shared_ptr<Source>>& last_capture_sources ();
        void reset_last_capture_sources ();
 
        bool record_enabled () const { return _record_enabled.load(); }
        bool record_safe () const { return _record_safe.load(); }
 
        void set_record_enabled (bool yn);
        void set_record_safe (bool yn);
        void mark_capture_xrun ();
 
        samplepos_t current_capture_start () const;
        samplepos_t current_capture_end () const;
 
        samplepos_t get_capture_start_sample (uint32_t n = 0) const;
        samplecnt_t get_captured_samples (uint32_t n = 0) const;
 
        float buffer_load () const;
 
        int seek (samplepos_t sample, bool complete_refill);
 
        static PBD::Signal<void()> Overrun;
 
        void set_note_mode (NoteMode m);
 
        PBD::Signal<void(std::weak_ptr<MidiSource> )> DataRecorded;
 
        PBD::Signal<void()> RecordEnableChanged;
        PBD::Signal<void()> RecordSafeChanged;
 
        void transport_looped (samplepos_t transport_sample);
        void transport_stopped_wallclock (struct tm&, time_t, bool abort);
 
        void adjust_buffering ();
 
        std::shared_ptr<MidiBuffer> get_gui_feed_buffer () const;
 
protected:
        friend class Track;
 
        struct WriterChannelInfo : public DiskIOProcessor::ChannelInfo {
                WriterChannelInfo (samplecnt_t buffer_size)
                        : DiskIOProcessor::ChannelInfo (buffer_size)
                {
                        resize (buffer_size);
                }
                void resize (samplecnt_t);
        };
 
        virtual XMLNode& state () const;
 
        int use_playlist (DataType, std::shared_ptr<Playlist>);
 
        int do_flush (RunContext context, bool force = false);
 
        void configuration_changed ();
 
private:
        static samplecnt_t _chunk_samples;
 
        int add_channel_to (std::shared_ptr<ChannelList>, uint32_t how_many);
 
        void engage_record_enable ();
        void disengage_record_enable ();
        void engage_record_safe ();
        void disengage_record_safe ();
 
        bool prep_record_enable ();
        bool prep_record_disable ();
 
        void calculate_record_range (Temporal::OverlapType ot, samplepos_t transport_sample,
                                     samplecnt_t nframes, samplecnt_t& rec_nframes,
                                     samplecnt_t& rec_offset);
 
        void check_record_status (samplepos_t transport_sample, double speed, bool can_record);
        void finish_capture (std::shared_ptr<ChannelList const> c);
        void reset_capture ();
 
        void loop (samplepos_t);
 
        CaptureInfos                 capture_info;
        mutable Glib::Threads::Mutex capture_info_lock;
 
        samplepos_t get_capture_start_sample_locked (uint32_t n = 0) const;
 
        std::optional<samplepos_t> _capture_start_sample;
 
        samplecnt_t   _capture_captured;
        bool          _was_recording;
        bool          _xrun_flag;
        XrunPositions _xruns;
        samplepos_t   _first_recordable_sample;
        samplepos_t   _last_recordable_sample;
        int           _last_possibly_recording;
        AlignStyle    _alignment_style;
        std::string   _write_source_name;
        NoteMode      _note_mode;
        samplepos_t   _accumulated_capture_offset;
 
        bool          _transport_looped;
        samplepos_t   _transport_loop_sample;
 
        std::atomic<int> _record_enabled;
        std::atomic<int> _record_safe;
        std::atomic<int> _samples_pending_write;
        std::atomic<int> _num_captured_loops;
        std::atomic<int> _reset_last_capture_sources;
 
        std::shared_ptr<SMFSource> _midi_write_source;
 
        std::list<std::shared_ptr<Source> >            _last_capture_sources;
        std::vector<std::shared_ptr<AudioFileSource> > capturing_sources;
 
        mutable EventRingBuffer<samplepos_t> _gui_feed_fifo;
        mutable Glib::Threads::Mutex         _gui_feed_reset_mutex;
};
 
} // namespace