libs/ardour/ardour/audio_diskstream.h

   1 /*
   2     Copyright (C) 2000-2006 Paul Davis
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17 */
  18
  19 #ifndef __ardour_audio_diskstream_h__
  20 #define __ardour_audio_diskstream_h__
  21
  22
  23 #include <cmath>
  24 #include <string>
  25 #include <queue>
  26 #include <map>
  27 #include <vector>
  28
  29 #include <time.h>
  30
  31 #include <boost/utility.hpp>
  32
  33 #include "pbd/fastlog.h"
  34 #include "pbd/ringbufferNPT.h"
  35 #include "pbd/stateful.h"
  36 #include "pbd/rcu.h"
  37
  38 #include "ardour/ardour.h"
  39 #include "ardour/utils.h"
  40 #include "ardour/diskstream.h"
  41 #include "ardour/audioplaylist.h"
  42 #include "ardour/port.h"
  43 #include "ardour/interpolation.h"
  44
  45 struct tm;
  46
  47 namespace ARDOUR {
  48
  49 class AudioEngine;
  50 class Send;
  51 class Session;
  52 class AudioPlaylist;
  53 class AudioFileSource;
  54 class IO;
  55
  56 class LIBARDOUR_API AudioDiskstream : public Diskstream
  57 {
  58   public:
  59         AudioDiskstream (Session &, const std::string& name, Diskstream::Flag f = Recordable);
  60         AudioDiskstream (Session &, const XMLNode&);
  61         ~AudioDiskstream();
  62
  63         float playback_buffer_load() const;
  64         float capture_buffer_load() const;
  65
  66         std::string input_source (uint32_t n=0) const {
  67                 boost::shared_ptr<ChannelList> c = channels.reader();
  68                 if (n < c->size()) {
  69                         return (*c)[n]->source.name;
  70                 } else {
  71                         return "";
  72                 }
  73         }
  74
  75         void set_record_enabled (bool yn);
  76         int set_destructive (bool yn);
  77         int set_non_layered (bool yn);
  78         bool can_become_destructive (bool& requires_bounce) const;
  79
  80         boost::shared_ptr<AudioPlaylist> audio_playlist () { return boost::dynamic_pointer_cast<AudioPlaylist>(_playlist); }
  81
  82         int use_playlist (boost::shared_ptr<Playlist>);
  83         int use_new_playlist ();
  84         int use_copy_playlist ();
  85
  86         Sample *playback_buffer (uint32_t n = 0) {
  87                 boost::shared_ptr<ChannelList> c = channels.reader();
  88                 if (n < c->size())
  89                         return (*c)[n]->current_playback_buffer;
  90                 return 0;
  91         }
  92
  93         Sample *capture_buffer (uint32_t n = 0) {
  94                 boost::shared_ptr<ChannelList> c = channels.reader();
  95                 if (n < c->size())
  96                         return (*c)[n]->current_capture_buffer;
  97                 return 0;
  98         }
  99
 100         boost::shared_ptr<AudioFileSource> write_source (uint32_t n=0) {
 101                 boost::shared_ptr<ChannelList> c = channels.reader();
 102                 if (n < c->size())
 103                         return (*c)[n]->write_source;
 104                 return boost::shared_ptr<AudioFileSource>();
 105         }
 106
 107         int add_channel (uint32_t how_many);
 108         int remove_channel (uint32_t how_many);
 109
 110         bool set_name (std::string const &);
 111
 112         /* stateful */
 113
 114         XMLNode& get_state(void);
 115         int      set_state(const XMLNode& node, int version);
 116
 117         void request_input_monitoring (bool);
 118
 119         static void swap_by_ptr (Sample *first, Sample *last) {
 120                 while (first < last) {
 121                         Sample tmp = *first;
 122                         *first++ = *last;
 123                         *last-- = tmp;
 124                 }
 125         }
 126
 127         CubicInterpolation interpolation;
 128
 129   protected:
 130         friend class Session;
 131
 132         /* the Session is the only point of access for these
 133            because they require that the Session is "inactive"
 134            while they are called.
 135         */
 136
 137         void set_pending_overwrite(bool);
 138         int  overwrite_existing_buffers ();
 139         void set_block_size (pframes_t);
 140         int  internal_playback_seek (framecnt_t distance);
 141         int  can_internal_playback_seek (framecnt_t distance);
 142         void reset_write_sources (bool, bool force = false);
 143         void non_realtime_input_change ();
 144         void non_realtime_locate (framepos_t location);
 145
 146   protected:
 147         friend class Auditioner;
 148         friend class AudioTrack;
 149         int  seek (framepos_t which_sample, bool complete_refill = false);
 150
 151         int  process (BufferSet&, framepos_t transport_frame, pframes_t nframes, framecnt_t &, bool need_disk_signal);
 152         frameoffset_t calculate_playback_distance (pframes_t nframes);
 153         bool commit  (framecnt_t);
 154
 155   private:
 156         struct ChannelSource {
 157                 std::string name;
 158
 159                 bool is_physical () const;
 160                 void request_input_monitoring (bool) const;
 161         };
 162
 163         /** Information about one of our channels */
 164         struct ChannelInfo : public boost::noncopyable {
 165
 166                 ChannelInfo (framecnt_t playback_buffer_size,
 167                              framecnt_t capture_buffer_size,
 168                              framecnt_t speed_buffer_size,
 169                              framecnt_t wrap_buffer_size);
 170                 ~ChannelInfo ();
 171
 172                 Sample     *playback_wrap_buffer;
 173                 Sample     *capture_wrap_buffer;
 174                 Sample     *speed_buffer;
 175
 176                 boost::shared_ptr<AudioFileSource> write_source;
 177
 178                 /** Information about the Port that our audio data comes from */
 179                 ChannelSource source;
 180
 181                 Sample       *current_capture_buffer;
 182                 Sample       *current_playback_buffer;
 183
 184                 /** A ringbuffer for data to be played back, written to in the
 185                     butler thread, read from in the process thread.
 186                 */
 187                 PBD::RingBufferNPT<Sample> *playback_buf;
 188                 PBD::RingBufferNPT<Sample> *capture_buf;
 189
 190                 Sample* scrub_buffer;
 191                 Sample* scrub_forward_buffer;
 192                 Sample* scrub_reverse_buffer;
 193
 194                 PBD::RingBufferNPT<Sample>::rw_vector playback_vector;
 195                 PBD::RingBufferNPT<Sample>::rw_vector capture_vector;
 196
 197                 PBD::RingBufferNPT<CaptureTransition> * capture_transition_buf;
 198                 // the following are used in the butler thread only
 199                 framecnt_t                     curr_capture_cnt;
 200
 201                 void resize_playback (framecnt_t);
 202                 void resize_capture (framecnt_t);
 203         };
 204
 205         typedef std::vector<ChannelInfo*> ChannelList;
 206
 207         /* The two central butler operations */
 208         int do_flush (RunContext context, bool force = false);
 209         int do_refill () { return _do_refill(_mixdown_buffer, _gain_buffer); }
 210
 211         int do_refill_with_alloc ();
 212
 213         int read (Sample* buf, Sample* mixdown_buffer, float* gain_buffer,
 214                   framepos_t& start, framecnt_t cnt,
 215                   int channel, bool reversed);
 216
 217         void finish_capture (boost::shared_ptr<ChannelList>);
 218         void transport_stopped_wallclock (struct tm&, time_t, bool abort);
 219         void transport_looped (framepos_t transport_frame);
 220
 221         void init ();
 222
 223         void init_channel (ChannelInfo &chan);
 224         void destroy_channel (ChannelInfo &chan);
 225
 226         int use_new_write_source (uint32_t n=0);
 227
 228         int find_and_use_playlist (const std::string &);
 229
 230         void allocate_temporary_buffers ();
 231
 232         int use_pending_capture_data (XMLNode& node);
 233
 234         void get_input_sources ();
 235         void prepare_record_status(framepos_t capture_start_frame);
 236         void set_align_style_from_io();
 237         void setup_destructive_playlist ();
 238         void use_destructive_playlist ();
 239
 240         void adjust_playback_buffering ();
 241         void adjust_capture_buffering ();
 242
 243         bool prep_record_enable ();
 244         bool prep_record_disable ();
 245
 246         // Working buffers for do_refill (butler thread)
 247         static void allocate_working_buffers();
 248         static void free_working_buffers();
 249
 250         static size_t  _working_buffers_size;
 251         static Sample* _mixdown_buffer;
 252         static gain_t* _gain_buffer;
 253
 254         std::vector<boost::shared_ptr<AudioFileSource> > capturing_sources;
 255
 256         SerializedRCUManager<ChannelList> channels;
 257
 258  /* really */
 259   private:
 260         int _do_refill (Sample *mixdown_buffer, float *gain_buffer);
 261
 262         int add_channel_to (boost::shared_ptr<ChannelList>, uint32_t how_many);
 263         int remove_channel_from (boost::shared_ptr<ChannelList>, uint32_t how_many);
 264
 265 };
 266
 267 } // namespace ARDOUR
 268
 269 #endif /* __ardour_audio_diskstream_h__ */