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audio_diskstream.h

/*
    Copyright (C) 2000-2006 Paul Davis 

    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.
*/

#ifndef __ardour_audio_diskstream_h__
#define __ardour_audio_diskstream_h__

#include <sigc++/signal.h>

#include <cmath>
#include <string>
#include <queue>
#include <map>
#include <vector>

#include <time.h>

#include <pbd/fastlog.h>
#include <pbd/ringbufferNPT.h>
#include <pbd/stateful.h> 
#include <pbd/rcu.h> 

#include <ardour/ardour.h>
#include <ardour/configuration.h>
#include <ardour/session.h>
#include <ardour/route_group.h>
#include <ardour/route.h>
#include <ardour/port.h>
#include <ardour/utils.h>
#include <ardour/diskstream.h>
#include <ardour/audioplaylist.h>

struct tm;

namespace ARDOUR {

class AudioEngine;
class Send;
class Session;
class AudioPlaylist;
class AudioFileSource;
class IO;

class AudioDiskstream : public Diskstream
{     
  public:
      AudioDiskstream (Session &, const string& name, Diskstream::Flag f = Recordable);
      AudioDiskstream (Session &, const XMLNode&);
      ~AudioDiskstream();

      float playback_buffer_load() const;
      float capture_buffer_load() const;

      string input_source (uint32_t n=0) const {
            boost::shared_ptr<ChannelList> c = channels.reader();
            if (n < c->size()) {
                  return (*c)[n]->source ? (*c)[n]->source->name() : "";
            } else {
                  return ""; 
            }
      }

      Port *input_source_port (uint32_t n=0) const { 
            boost::shared_ptr<ChannelList> c = channels.reader();
            if (n < c->size()) return (*c)[n]->source; return 0; 
      }

      void set_record_enabled (bool yn);
      int set_destructive (bool yn);
      bool can_become_destructive (bool& requires_bounce) const;

      float peak_power(uint32_t n = 0) { 
            boost::shared_ptr<ChannelList> c = channels.reader();
            ChannelInfo* chaninfo = (*c)[n];
            float x = chaninfo->peak_power;
            chaninfo->peak_power = 0.0f;
            if (x > 0.0f) {
                  return 20.0f * fast_log10(x);
            } else {
                  return minus_infinity();
            }
      }
      
      boost::shared_ptr<AudioPlaylist> audio_playlist () { return boost::dynamic_pointer_cast<AudioPlaylist>(_playlist); }

      int use_playlist (boost::shared_ptr<Playlist>);
      int use_new_playlist ();
      int use_copy_playlist ();

      Sample *playback_buffer (uint32_t n = 0) {
            boost::shared_ptr<ChannelList> c = channels.reader();
            if (n < c->size())
                  return (*c)[n]->current_playback_buffer;
            return 0;
      }
      
      Sample *capture_buffer (uint32_t n = 0) {
            boost::shared_ptr<ChannelList> c = channels.reader();
            if (n < c->size())
                  return (*c)[n]->current_capture_buffer;
            return 0;
      }

      boost::shared_ptr<AudioFileSource> write_source (uint32_t n=0) {
            boost::shared_ptr<ChannelList> c = channels.reader();
            if (n < c->size())
                  return (*c)[n]->write_source;
            return boost::shared_ptr<AudioFileSource>();
      }

      int add_channel (uint32_t how_many);
      int remove_channel (uint32_t how_many);
      
      /* stateful */

      XMLNode& get_state(void);
      int      set_state(const XMLNode& node);

      void monitor_input (bool);

      static void swap_by_ptr (Sample *first, Sample *last) {
            while (first < last) {
                  Sample tmp = *first;
                  *first++ = *last;
                  *last-- = tmp;
            }
      }

      static void swap_by_ptr (Sample *first, Sample *last, nframes_t n) {
            while (n--) {
                  Sample tmp = *first;
                  *first++ = *last;
                  *last-- = tmp;
            }
      }

      XMLNode* deprecated_io_node;

  protected:
      friend class Session;

      /* the Session is the only point of access for these
         because they require that the Session is "inactive"
         while they are called.
      */

      void set_pending_overwrite(bool);
      int  overwrite_existing_buffers ();
      void set_block_size (nframes_t);
      int  internal_playback_seek (nframes_t distance);
      int  can_internal_playback_seek (nframes_t distance);
      int  rename_write_sources ();
      void reset_write_sources (bool, bool force = false);
      void non_realtime_input_change ();

  protected:
      friend class Auditioner;
      int  seek (nframes_t which_sample, bool complete_refill = false);

  protected:
      friend class AudioTrack;

      int  process (nframes_t transport_frame, nframes_t nframes, nframes_t offset, bool can_record, bool rec_monitors_input);
      bool commit  (nframes_t nframes);

  private:

      struct ChannelInfo {
          
          ChannelInfo (nframes_t buffer_size, nframes_t speed_buffer_size, nframes_t wrap_buffer_size);
          ~ChannelInfo ();

          Sample     *playback_wrap_buffer;
          Sample     *capture_wrap_buffer;
          Sample     *speed_buffer;
          
          float       peak_power;
          
          boost::shared_ptr<AudioFileSource> fades_source;
          boost::shared_ptr<AudioFileSource> write_source;
          
          Port         *source;
          Sample       *current_capture_buffer;
          Sample       *current_playback_buffer;
          
          RingBufferNPT<Sample> *playback_buf;
          RingBufferNPT<Sample> *capture_buf;
          
          Sample* scrub_buffer;
          Sample* scrub_forward_buffer;
          Sample* scrub_reverse_buffer;
          
          RingBufferNPT<Sample>::rw_vector playback_vector;
          RingBufferNPT<Sample>::rw_vector capture_vector;
          
          RingBufferNPT<CaptureTransition> * capture_transition_buf;
          // the following are used in the butler thread only
          nframes_t                     curr_capture_cnt;
      };

      typedef std::vector<ChannelInfo*> ChannelList;

      /* The two central butler operations */
      int do_flush (Session::RunContext context, bool force = false);
      int do_refill () { return _do_refill(_mixdown_buffer, _gain_buffer); }
      
      int do_refill_with_alloc ();

      int read (Sample* buf, Sample* mixdown_buffer, float* gain_buffer,
              nframes_t& start, nframes_t cnt, 
              ChannelInfo* channel_info, int channel, bool reversed);

      void finish_capture (bool rec_monitors_input, boost::shared_ptr<ChannelList>);
      void transport_stopped (struct tm&, time_t, bool abort);
      void transport_looped (nframes_t transport_frame);

      void init (Diskstream::Flag);

      void init_channel (ChannelInfo &chan);
      void destroy_channel (ChannelInfo &chan);
      
      int use_new_write_source (uint32_t n=0);

      int find_and_use_playlist (const string&);

      void allocate_temporary_buffers ();

      int use_pending_capture_data (XMLNode& node);

      void get_input_sources ();
      void check_record_status (nframes_t transport_frame, nframes_t nframes, bool can_record);
      void set_align_style_from_io();
      void setup_destructive_playlist ();
      void use_destructive_playlist ();

      void engage_record_enable ();
      void disengage_record_enable ();

      // Working buffers for do_refill (butler thread)
      static void allocate_working_buffers();
      static void free_working_buffers();

      static size_t  _working_buffers_size;
      static Sample* _mixdown_buffer;
      static gain_t* _gain_buffer;

      std::vector<boost::shared_ptr<AudioFileSource> > capturing_sources;
      
      SerializedRCUManager<ChannelList> channels;
      
 /* really */
  private:
      int _do_refill (Sample *mixdown_buffer, float *gain_buffer);

      int add_channel_to (boost::shared_ptr<ChannelList>, uint32_t how_many);
      int remove_channel_from (boost::shared_ptr<ChannelList>, uint32_t how_many);

};

} // namespace ARDOUR

#endif /* __ardour_audio_diskstream_h__ */

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