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diskstream.cc

/*
    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.

*/

#include <fstream>
#include <cassert>
#include <cstdio>
#include <unistd.h>
#include <cmath>
#include <cerrno>
#include <string>
#include <climits>
#include <fcntl.h>
#include <cstdlib>
#include <ctime>
#include <sys/stat.h>
#include <sys/mman.h>

#include <sigc++/bind.h>

#include <pbd/error.h>
#include <pbd/basename.h>
#include <glibmm/thread.h>
#include <pbd/xml++.h>

#include <ardour/ardour.h>
#include <ardour/audioengine.h>
#include <ardour/diskstream.h>
#include <ardour/utils.h>
#include <ardour/configuration.h>
#include <ardour/audiofilesource.h>
#include <ardour/send.h>
#include <ardour/playlist.h>
#include <ardour/cycle_timer.h>
#include <ardour/region.h>

#include "i18n.h"
#include <locale.h>

using namespace std;
using namespace ARDOUR;
using namespace PBD;

/* XXX This goes uninitialized when there is no ~/.ardour2 directory.
 * I can't figure out why, so this will do for now (just stole the
 * default from configuration_vars.h).  0 is not a good value for
 * allocating buffer sizes..
 */
nframes_t Diskstream::disk_io_chunk_frames = 1024 * 256;

sigc::signal<void>                Diskstream::DiskOverrun;
sigc::signal<void>                Diskstream::DiskUnderrun;

Diskstream::Diskstream (Session &sess, const string &name, Flag flag)
      : _name (name)
      , _session (sess)
{
      init (flag);
}
      
Diskstream::Diskstream (Session& sess, const XMLNode& node)
      : _session (sess)
{
      init (Recordable);
}

void
Diskstream::init (Flag f)
{
      _flags = f;
      _io = 0;
      _alignment_style = ExistingMaterial;
      _persistent_alignment_style = ExistingMaterial;
      first_input_change = true;
      i_am_the_modifier = 0;
      g_atomic_int_set (&_record_enabled, 0);
      was_recording = false;
      capture_start_frame = 0;
      capture_captured = 0;
      _visible_speed = 1.0f;
      _actual_speed = 1.0f;
      _buffer_reallocation_required = false;
      _seek_required = false;
      first_recordable_frame = max_frames;
      last_recordable_frame = max_frames;
      _roll_delay = 0;
      _capture_offset = 0;
      _processed = false;
      _slaved = false;
      adjust_capture_position = 0;
      last_possibly_recording = 0;
      loop_location = 0;
      wrap_buffer_size = 0;
      speed_buffer_size = 0;
      last_phase = 0;
      phi = (uint64_t) (0x1000000);
      target_phi = phi;
      file_frame = 0;
      playback_sample = 0;
      playback_distance = 0;
      _read_data_count = 0;
      _write_data_count = 0;
      commit_should_unlock = false;

      pending_overwrite = false;
      overwrite_frame = 0;
      overwrite_queued = false;
      input_change_pending = NoChange;

      _n_channels = 0;
}

Diskstream::~Diskstream ()
{
      if (_playlist)
            _playlist->release ();
}

void
Diskstream::set_io (IO& io)
{
      _io = &io;
      set_align_style_from_io ();
}

void
Diskstream::handle_input_change (IOChange change, void *src)
{
      Glib::Mutex::Lock lm (state_lock);

      if (!(input_change_pending & change)) {
            input_change_pending = IOChange (input_change_pending|change);
            _session.request_input_change_handling ();
      }
}

void
Diskstream::non_realtime_set_speed ()
{
      if (_buffer_reallocation_required) {
            Glib::Mutex::Lock lm (state_lock);
            allocate_temporary_buffers ();

            _buffer_reallocation_required = false;
      }

      if (_seek_required) {
            if (speed() != 1.0f || speed() != -1.0f) {
                  seek ((nframes_t) (_session.transport_frame() * (double) speed()), true);
            }
            else {
                  seek (_session.transport_frame(), true);
            }

            _seek_required = false;
      }
}

bool
Diskstream::realtime_set_speed (double sp, bool global)
{
      bool changed = false;
      double new_speed = sp * _session.transport_speed();
      
      if (_visible_speed != sp) {
            _visible_speed = sp;
            changed = true;
      }
      
      if (new_speed != _actual_speed) {
            
            nframes_t required_wrap_size = (nframes_t) floor (_session.get_block_size() * 
                                                          fabs (new_speed)) + 1;
            
            if (required_wrap_size > wrap_buffer_size) {
                  _buffer_reallocation_required = true;
            }
            
            _actual_speed = new_speed;
            target_phi = (uint64_t) (0x1000000 * fabs(_actual_speed));
      }

      if (changed) {
            if (!global) {
                  _seek_required = true;
            }
            SpeedChanged (); /* EMIT SIGNAL */
      }

      return _buffer_reallocation_required || _seek_required;
}

void
Diskstream::prepare ()
{
      _processed = false;
      playback_distance = 0;
}

void
Diskstream::recover ()
{
      if (commit_should_unlock) {
            state_lock.unlock();
      }
      _processed = false;
}

void
Diskstream::set_capture_offset ()
{
      if (_io == 0) {
            /* can't capture, so forget it */
            return;
      }

      _capture_offset = _io->input_latency();
}

void
Diskstream::set_align_style (AlignStyle a)
{
      if (record_enabled() && _session.actively_recording()) {
            return;
      }

      if (a != _alignment_style) {
            _alignment_style = a;
            AlignmentStyleChanged ();
      }
}

int
Diskstream::set_loop (Location *location)
{
      if (location) {
            if (location->start() >= location->end()) {
                  error << string_compose(_("Location \"%1\" not valid for track loop (start >= end)"), location->name()) << endl;
                  return -1;
            }
      }

      loop_location = location;

       LoopSet (location); /* EMIT SIGNAL */
      return 0;
}

nframes_t
Diskstream::get_capture_start_frame (uint32_t n)
{
      Glib::Mutex::Lock lm (capture_info_lock);

      if (capture_info.size() > n) {
            return capture_info[n]->start;
      }
      else {
            return capture_start_frame;
      }
}

nframes_t
Diskstream::get_captured_frames (uint32_t n)
{
      Glib::Mutex::Lock lm (capture_info_lock);

      if (capture_info.size() > n) {
            return capture_info[n]->frames;
      }
      else {
            return capture_captured;
      }
}

void
Diskstream::set_roll_delay (nframes_t nframes)
{
      _roll_delay = nframes;
}

void
Diskstream::set_speed (double sp)
{
      _session.request_diskstream_speed (*this, sp);

      /* to force a rebuffering at the right place */
      playlist_modified();
}

int
Diskstream::use_playlist (boost::shared_ptr<Playlist> playlist)
{
      {
            Glib::Mutex::Lock lm (state_lock);

            if (playlist == _playlist) {
                  return 0;
            }

            plmod_connection.disconnect ();
            plgone_connection.disconnect ();

            if (_playlist) {
                  _playlist->release();
            }
                  
            _playlist = playlist;
            _playlist->use();

            if (!in_set_state && recordable()) {
                  reset_write_sources (false);
            }
            
            plmod_connection = _playlist->Modified.connect (mem_fun (*this, &Diskstream::playlist_modified));
            plgone_connection = _playlist->GoingAway.connect (bind (mem_fun (*this, &Diskstream::playlist_deleted), boost::weak_ptr<Playlist>(_playlist)));
      }

      /* don't do this if we've already asked for it *or* if we are setting up
         the diskstream for the very first time - the input changed handling will
         take care of the buffer refill.
      */

      if (!overwrite_queued && !(_session.state_of_the_state() & Session::CannotSave)) {
            _session.request_overwrite_buffer (this);
            overwrite_queued = true;
      }
      
      PlaylistChanged (); /* EMIT SIGNAL */
      _session.set_dirty ();

      return 0;
}

void
Diskstream::playlist_changed (Change ignored)
{
      playlist_modified ();
}

void
Diskstream::playlist_modified ()
{
      if (!i_am_the_modifier && !overwrite_queued) {
            _session.request_overwrite_buffer (this);
            overwrite_queued = true;
      } 
}

void
Diskstream::playlist_deleted (boost::weak_ptr<Playlist> wpl)
{
      boost::shared_ptr<Playlist> pl (wpl.lock());

      if (pl == _playlist) {

            /* this catches an ordering issue with session destruction. playlists 
               are destroyed before diskstreams. we have to invalidate any handles
               we have to the playlist.
            */
            
            if (_playlist) {
                  _playlist.reset ();
            } 
      }
}

int
Diskstream::set_name (string str)
{
      if (str != _name) {
            assert(playlist());
            playlist()->set_name (str);
            _name = str;
            
            if (!in_set_state && recordable()) {
                  /* rename existing capture files so that they have the correct name */
                  return rename_write_sources ();
            } else {
                  return -1;
            }
      }

      return 0;
}

void
Diskstream::remove_region_from_last_capture (boost::weak_ptr<Region> wregion)
{
      boost::shared_ptr<Region> region (wregion.lock());

      if (!region) {
            return;
      }
      
      _last_capture_regions.remove (region);
}

void
Diskstream::prepare_to_stop (nframes_t pos)
{
        last_recordable_frame = pos + _capture_offset;
}

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