2 Copyright (C) 2000-2006 Paul Davis
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.
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.
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.
20 #ifndef __ardour_diskstream_h__
21 #define __ardour_diskstream_h__
30 #include <boost/utility.hpp>
32 #include "evoral/Range.hpp"
34 #include "ardour/ardour.h"
35 #include "ardour/chan_count.h"
36 #include "ardour/session_object.h"
37 #include "ardour/libardour_visibility.h"
38 #include "ardour/types.h"
39 #include "ardour/utils.h"
40 #include "ardour/public_diskstream.h"
55 /** Parent class for classes which can stream data to and from disk.
56 * These are used by Tracks to get playback and put recorded data.
58 class LIBARDOUR_API Diskstream : public SessionObject, public PublicDiskstream
68 Diskstream (Session &, const std::string& name, Flag f = Recordable);
69 Diskstream (Session &, const XMLNode&);
70 virtual ~Diskstream();
72 virtual bool set_name (const std::string& str);
73 virtual bool set_write_source_name (const std::string& str);
75 std::string write_source_name () const {
76 if (_write_source_name.empty()) {
79 return _write_source_name;
83 virtual std::string steal_write_source_name () { return std::string(); }
85 boost::shared_ptr<ARDOUR::IO> io() const { return _io; }
86 void set_track (ARDOUR::Track *);
88 /** @return A number between 0 and 1, where 0 indicates that the playback buffer
89 * is dry (ie the disk subsystem could not keep up) and 1 indicates that the
92 virtual float playback_buffer_load() const = 0;
93 virtual float capture_buffer_load() const = 0;
95 void set_flag (Flag f) { _flags = Flag (_flags | f); }
96 void unset_flag (Flag f) { _flags = Flag (_flags & ~f); }
98 AlignStyle alignment_style() const { return _alignment_style; }
99 AlignChoice alignment_choice() const { return _alignment_choice; }
100 void set_align_style (AlignStyle, bool force=false);
101 void set_align_choice (AlignChoice a, bool force=false);
103 framecnt_t roll_delay() const { return _roll_delay; }
104 void set_roll_delay (framecnt_t);
106 bool record_enabled() const { return g_atomic_int_get (const_cast<gint*>(&_record_enabled)); }
107 bool record_safe () const { return g_atomic_int_get (const_cast<gint*>(&_record_safe)); }
108 virtual void set_record_enabled (bool yn) = 0;
109 virtual void set_record_safe (bool yn) = 0;
111 bool destructive() const { return _flags & Destructive; }
112 #ifdef XXX_OLD_DESTRUCTIVE_API_XXX
113 virtual int set_destructive (bool /*yn*/) { return -1; }
114 virtual int set_non_layered (bool /*yn*/) { return -1; }
115 virtual bool can_become_destructive (bool& /*requires_bounce*/) const { return false; }
118 bool hidden() const { return _flags & Hidden; }
119 bool recordable() const { return _flags & Recordable; }
120 bool non_layered() const; // { return _flags & NonLayered; }
121 bool reversed() const { return _actual_speed < 0.0f; }
122 double speed() const { return _visible_speed; }
124 virtual void punch_in() {}
125 virtual void punch_out() {}
127 void non_realtime_set_speed ();
128 virtual void non_realtime_locate (framepos_t /*location*/) {};
129 virtual void playlist_modified ();
131 boost::shared_ptr<Playlist> playlist () { return _playlist; }
133 virtual int use_playlist (boost::shared_ptr<Playlist>);
134 virtual int use_new_playlist () = 0;
135 virtual int use_copy_playlist () = 0;
137 /** @return Start position of currently-running capture (in session frames) */
138 framepos_t current_capture_start() const { return capture_start_frame; }
139 framepos_t current_capture_end() const { return capture_start_frame + capture_captured; }
140 framepos_t get_capture_start_frame (uint32_t n = 0) const;
141 framecnt_t get_captured_frames (uint32_t n = 0) const;
143 ChanCount n_channels() { return _n_channels; }
145 static framecnt_t disk_read_frames() { return disk_read_chunk_frames; }
146 static framecnt_t disk_write_frames() { return disk_write_chunk_frames; }
147 static void set_disk_read_chunk_frames (framecnt_t n) { disk_read_chunk_frames = n; }
148 static void set_disk_write_chunk_frames (framecnt_t n) { disk_write_chunk_frames = n; }
149 static framecnt_t default_disk_read_chunk_frames ();
150 static framecnt_t default_disk_write_chunk_frames ();
152 static void set_buffering_parameters (BufferingPreset bp);
155 virtual XMLNode& get_state(void);
156 virtual int set_state(const XMLNode&, int version);
158 virtual void request_input_monitoring (bool) {}
159 virtual void ensure_input_monitoring (bool) {}
161 framecnt_t capture_offset() const { return _capture_offset; }
162 virtual void set_capture_offset ();
164 bool slaved() const { return _slaved; }
165 void set_slaved(bool yn) { _slaved = yn; }
167 int set_loop (Location *loc);
169 std::list<boost::shared_ptr<Source> >& last_capture_sources () { return _last_capture_sources; }
171 void handle_input_change (IOChange, void *src);
173 void move_processor_automation (boost::weak_ptr<Processor>,
174 std::list<Evoral::RangeMove<framepos_t> > const &);
176 /** For non-butler contexts (allocates temporary working buffers)
178 * This accessible method has a default argument; derived classes
179 * must inherit the virtual method that we call which does NOT
180 * have a default argument, to avoid complications with inheritance
182 int do_refill_with_alloc(bool partial_fill = true) {
183 return _do_refill_with_alloc (partial_fill);
185 virtual void set_block_size (pframes_t) = 0;
187 bool pending_overwrite () const {
188 return _pending_overwrite;
191 PBD::Signal0<void> RecordEnableChanged;
192 PBD::Signal0<void> RecordSafeChanged;
193 PBD::Signal0<void> SpeedChanged;
194 PBD::Signal0<void> ReverseChanged;
195 /* Emitted when this diskstream is set to use a different playlist */
196 PBD::Signal0<void> PlaylistChanged;
197 PBD::Signal0<void> AlignmentStyleChanged;
198 PBD::Signal1<void,Location *> LoopSet;
200 static PBD::Signal0<void> DiskOverrun;
201 static PBD::Signal0<void> DiskUnderrun;
204 friend class Session;
207 /* the Session is the only point of access for these because they require
208 * that the Session is "inactive" while they are called.
211 virtual void set_pending_overwrite (bool) = 0;
212 virtual int overwrite_existing_buffers () = 0;
213 virtual int internal_playback_seek (framecnt_t distance) = 0;
214 virtual int can_internal_playback_seek (framecnt_t distance) = 0;
215 virtual void reset_write_sources (bool, bool force = false) = 0;
216 virtual void non_realtime_input_change () = 0;
217 /* accessible method has default argument, so use standard C++ "trick"
218 to avoid complications with inheritance, by adding this virtual
219 method which does NOT have a default argument.
221 virtual int _do_refill_with_alloc (bool partial_fill) = 0;
224 friend class Auditioner;
225 virtual int seek (framepos_t which_sample, bool complete_refill = false) = 0;
230 virtual int process (BufferSet&, framepos_t transport_frame, pframes_t nframes, framecnt_t &, bool need_disk_signal) = 0;
231 virtual frameoffset_t calculate_playback_distance (pframes_t nframes) = 0;
232 virtual bool commit (framecnt_t) = 0;
236 enum TransitionType {
241 struct CaptureTransition {
243 framepos_t capture_val; ///< The start or end file frame position
246 /* The two central butler operations */
247 virtual int do_flush (RunContext context, bool force = false) = 0;
248 virtual int do_refill () = 0;
250 /* XXX fix this redundancy ... */
252 virtual void playlist_changed (const PBD::PropertyChange&);
253 virtual void playlist_deleted (boost::weak_ptr<Playlist>);
254 virtual void playlist_ranges_moved (std::list< Evoral::RangeMove<framepos_t> > const &, bool);
256 virtual void transport_stopped_wallclock (struct tm&, time_t, bool abort) = 0;
257 virtual void transport_looped (framepos_t transport_frame) = 0;
264 virtual int use_new_write_source (uint32_t n=0) = 0;
266 virtual int find_and_use_playlist (const std::string&) = 0;
268 virtual void allocate_temporary_buffers () = 0;
270 virtual bool realtime_set_speed (double, bool global_change);
272 std::list<boost::shared_ptr<Source> > _last_capture_sources;
274 virtual int use_pending_capture_data (XMLNode& node) = 0;
276 virtual void check_record_status (framepos_t transport_frame, bool can_record);
277 virtual void prepare_record_status (framepos_t /*capture_start_frame*/) {}
278 virtual void set_align_style_from_io() {}
279 virtual void setup_destructive_playlist () {}
280 virtual void use_destructive_playlist () {}
281 virtual void prepare_to_stop (framepos_t transport_pos, framepos_t audible_frame);
283 void engage_record_enable ();
284 void disengage_record_enable ();
285 void engage_record_safe ();
286 void disengage_record_safe ();
288 virtual bool prep_record_enable () = 0;
289 virtual bool prep_record_disable () = 0;
291 void calculate_record_range (
292 Evoral::OverlapType ot, framepos_t transport_frame, framecnt_t nframes,
293 framecnt_t& rec_nframes, framecnt_t& rec_offset
296 static framecnt_t disk_read_chunk_frames;
297 static framecnt_t disk_write_chunk_frames;
299 std::vector<CaptureInfo*> capture_info;
300 mutable Glib::Threads::Mutex capture_info_lock;
302 uint32_t i_am_the_modifier;
304 boost::shared_ptr<ARDOUR::IO> _io;
306 ChanCount _n_channels;
308 boost::shared_ptr<Playlist> _playlist;
310 gint _record_enabled;
312 double _visible_speed;
313 double _actual_speed;
314 /* items needed for speed change logic */
315 bool _buffer_reallocation_required;
318 /** Start of currently running capture in session frames */
319 framepos_t capture_start_frame;
320 framecnt_t capture_captured;
322 framecnt_t adjust_capture_position;
323 framecnt_t _capture_offset;
324 /** The number of frames by which this diskstream's output should be delayed
325 with respect to the transport frame. This is used for latency compensation.
327 framecnt_t _roll_delay;
328 framepos_t first_recordable_frame;
329 framepos_t last_recordable_frame;
330 int last_possibly_recording;
331 AlignStyle _alignment_style;
332 AlignChoice _alignment_choice;
334 Location* loop_location;
335 framepos_t overwrite_frame;
336 off_t overwrite_offset;
337 bool _pending_overwrite;
338 bool overwrite_queued;
339 IOChange input_change_pending;
340 framecnt_t wrap_buffer_size;
341 framecnt_t speed_buffer_size;
344 double _target_speed;
346 /** The next frame position that we should be reading from in our playlist */
347 framepos_t file_frame;
348 framepos_t playback_sample;
352 std::string _write_source_name;
354 Glib::Threads::Mutex state_lock;
356 PBD::ScopedConnectionList playlist_connections;
358 PBD::ScopedConnection ic_connection;
361 XMLNode* deprecated_io_node;
363 void route_going_away ();
365 static bool get_buffering_presets (BufferingPreset bp,
366 framecnt_t& read_chunk_size,
367 framecnt_t& read_buffer_size,
368 framecnt_t& write_chunk_size,
369 framecnt_t& write_buffer_size);
372 }; /* namespace ARDOUR */
374 #endif /* __ardour_diskstream_h__ */