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-rw-r--r--gtk2_ardour/ardour2_ui.rc2
-rw-r--r--gtk2_ardour/canvas-simpleline.c7
-rw-r--r--gtk2_ardour/editor.cc24
-rw-r--r--gtk2_ardour/editor_actions.cc6
-rw-r--r--gtk2_ardour/editor_mouse.cc5
-rw-r--r--gtk2_ardour/editor_tempodisplay.cc11
-rw-r--r--gtk2_ardour/gain_meter.cc17
-rw-r--r--libs/ardour/ardour/destructive_filesource.h14
-rw-r--r--libs/ardour/audiofilter.cc2
-rw-r--r--libs/ardour/destructive_filesource.cc128
-rw-r--r--libs/ardour/session_timefx.cc2
-rw-r--r--libs/gtkmm2ext/click_box.cc48
-rw-r--r--libs/gtkmm2ext/gtkmm2ext/click_box.h4
-rw-r--r--libs/midi++2/mmc.cc40
14 files changed, 262 insertions, 48 deletions
diff --git a/gtk2_ardour/ardour2_ui.rc b/gtk2_ardour/ardour2_ui.rc
index 92a9cbb19a..90ecf53717 100644
--- a/gtk2_ardour/ardour2_ui.rc
+++ b/gtk2_ardour/ardour2_ui.rc
@@ -1709,7 +1709,7 @@ widget "*cTempoMarker" style "cTempoMarker"
style "cMeasureLineBeat"
{
- fg[NORMAL] = { 0.51, 0.59, 0.51 }
+ fg[NORMAL] = { 0.51, 0.59, 0.87 }
fg[ACTIVE] = { 0.98, 0, 0 }
}
widget "*cMeasureLineBeat" style "cMeasureLineBeat"
diff --git a/gtk2_ardour/canvas-simpleline.c b/gtk2_ardour/canvas-simpleline.c
index 3aeee4b32a..4ba3d6bc76 100644
--- a/gtk2_ardour/canvas-simpleline.c
+++ b/gtk2_ardour/canvas-simpleline.c
@@ -287,6 +287,7 @@ gnome_canvas_simpleline_set_property (GObject *object,
case PROP_COLOR_RGBA:
if (simpleline->color != g_value_get_uint(value)) {
simpleline->color = g_value_get_uint(value);
+ UINT_TO_RGBA (simpleline->color, &simpleline->r, &simpleline->g, &simpleline->b, &simpleline->a);
update = TRUE;
}
break;
@@ -377,8 +378,8 @@ gnome_canvas_simpleline_render (GnomeCanvasItem *item,
buf->is_bg = FALSE;
}
- // begin = MAX(simpleline->bbox_ulx,buf->rect.x0);
- // end = MIN(simpleline->bbox_lrx,buf->rect.x1);
+ //begin = MAX(simpleline->bbox_ulx,buf->rect.x0);
+ //end = MIN(simpleline->bbox_lrx,buf->rect.x1);
begin = simpleline->bbox_ulx;
end = simpleline->bbox_lrx;
@@ -388,7 +389,7 @@ gnome_canvas_simpleline_render (GnomeCanvasItem *item,
PAINT_HORIZA(buf, simpleline->r, simpleline->g, simpleline->b, simpleline->a,
begin, end, simpleline->bbox_uly);
} else {
- PAINT_VERTA(buf, simpleline->r, simpleline->g, simpleline->b, simpleline->a,
+ PAINT_VERTA(buf, simpleline->r, simpleline->g, simpleline->b, simpleline->a,
begin, simpleline->bbox_uly, simpleline->bbox_lry);
}
}
diff --git a/gtk2_ardour/editor.cc b/gtk2_ardour/editor.cc
index 5800888d0c..d6b9f5b278 100644
--- a/gtk2_ardour/editor.cc
+++ b/gtk2_ardour/editor.cc
@@ -2121,19 +2121,37 @@ Editor::set_state (const XMLNode& node)
if ((prop = node.property ("show-waveforms"))) {
bool yn = (prop->value() == "yes");
_show_waveforms = !yn;
- set_show_waveforms (yn);
+ RefPtr<Action> act = ActionManager::get_action (X_("Editor"), X_("ToggleWaveformVisibility"));
+ if (act) {
+ RefPtr<ToggleAction> tact = RefPtr<ToggleAction>::cast_dynamic(act);
+ /* do it twice to force the change */
+ tact->set_active (!yn);
+ tact->set_active (yn);
+ }
}
if ((prop = node.property ("show-waveforms-recording"))) {
bool yn = (prop->value() == "yes");
_show_waveforms_recording = !yn;
- set_show_waveforms_recording (yn);
+ RefPtr<Action> act = ActionManager::get_action (X_("Editor"), X_("ToggleWaveformsWhileRecording"));
+ if (act) {
+ RefPtr<ToggleAction> tact = RefPtr<ToggleAction>::cast_dynamic(act);
+ /* do it twice to force the change */
+ tact->set_active (!yn);
+ tact->set_active (yn);
+ }
}
if ((prop = node.property ("show-measures"))) {
bool yn = (prop->value() == "yes");
_show_measures = !yn;
- set_show_measures (yn);
+ RefPtr<Action> act = ActionManager::get_action (X_("Editor"), X_("ToggleMeasureVisibility"));
+ if (act) {
+ RefPtr<ToggleAction> tact = RefPtr<ToggleAction>::cast_dynamic(act);
+ /* do it twice to force the change */
+ tact->set_active (!yn);
+ tact->set_active (yn);
+ }
}
if ((prop = node.property ("follow-playhead"))) {
diff --git a/gtk2_ardour/editor_actions.cc b/gtk2_ardour/editor_actions.cc
index 5f92c62bd7..e3dcfac15a 100644
--- a/gtk2_ardour/editor_actions.cc
+++ b/gtk2_ardour/editor_actions.cc
@@ -324,8 +324,8 @@ Editor::register_actions ()
ActionManager::register_toggle_action (editor_actions, X_("ToggleWaveformVisibility"), _("show waveforms"), mem_fun (*this, &Editor::toggle_waveform_visibility));
ActionManager::register_toggle_action (editor_actions, X_("ToggleWaveformsWhileRecording"), _("show waveforms while recording"), mem_fun (*this, &Editor::toggle_waveforms_while_recording));
- ActionManager::register_toggle_action (editor_actions, X_("ToggleMeasureVisibility"), _("show measures"), mem_fun (*this, &Editor::toggle_measure_visibility));
-
+ act = ActionManager::register_toggle_action (editor_actions, X_("ToggleMeasureVisibility"), _("show measures"), mem_fun (*this, &Editor::toggle_measure_visibility));
+
RadioAction::Group meter_falloff_group;
RadioAction::Group meter_hold_group;
@@ -377,7 +377,7 @@ Editor::toggle_waveforms_while_recording ()
void
Editor::toggle_measure_visibility ()
{
- Glib::RefPtr<Action> act = ActionManager::get_action (X_("Editor"), X_("ToggleWaveformVisibility"));
+ Glib::RefPtr<Action> act = ActionManager::get_action (X_("Editor"), X_("ToggleMeasureVisibility"));
if (act) {
Glib::RefPtr<ToggleAction> tact = Glib::RefPtr<ToggleAction>::cast_dynamic(act);
set_show_measures (tact->get_active());
diff --git a/gtk2_ardour/editor_mouse.cc b/gtk2_ardour/editor_mouse.cc
index 02271e2467..75a026f92b 100644
--- a/gtk2_ardour/editor_mouse.cc
+++ b/gtk2_ardour/editor_mouse.cc
@@ -94,6 +94,11 @@ Editor::event_frame (GdkEvent* event, double* pcx, double* pcy)
case GDK_LEAVE_NOTIFY:
track_canvas.w2c(event->crossing.x, event->crossing.y, *pcx, *pcy);
break;
+ case GDK_KEY_PRESS:
+ case GDK_KEY_RELEASE:
+ cerr << "here\n";
+ // track_canvas.w2c(event->key.x, event->key.y, *pcx, *pcy);
+ break;
default:
warning << string_compose (_("Editor::event_frame() used on unhandled event type %1"), event->type) << endmsg;
break;
diff --git a/gtk2_ardour/editor_tempodisplay.cc b/gtk2_ardour/editor_tempodisplay.cc
index d7e35caa20..70c92dfcdd 100644
--- a/gtk2_ardour/editor_tempodisplay.cc
+++ b/gtk2_ardour/editor_tempodisplay.cc
@@ -135,7 +135,6 @@ Editor::get_time_line ()
if (free_measure_lines.empty()) {
line = new ArdourCanvas::SimpleLine (*time_line_group);
- // cerr << "measure line @ " << line << endl;
used_measure_lines.push_back (line);
} else {
line = free_measure_lines.front();
@@ -182,7 +181,7 @@ Editor::draw_measures ()
break;
case TempoMap::Beat:
- xpos = p.frame / (gdouble) frames_per_unit;
+ xpos = frame_to_unit (p.frame);
if (last_beat < xpos) {
beat_spacing = xpos - last_beat;
}
@@ -199,8 +198,8 @@ Editor::draw_measures ()
break;
case TempoMap::Beat:
- xpos = p.frame / (gdouble) frames_per_unit;
-
+ xpos = frame_to_unit (p.frame);
+
if (p.beat == 1) {
color = color_map[cMeasureLineBeat];
} else {
@@ -214,12 +213,12 @@ Editor::draw_measures ()
break;
}
}
-
+
if (cnt == 0 || xpos - last_xpos > 4.0) {
line = get_time_line ();
line->property_x1() = xpos;
line->property_x2() = xpos;
- line->property_y2() = canvas_height;
+ line->property_y2() = 1000;
line->property_color_rgba() = color;
line->raise_to_top();
line->show();
diff --git a/gtk2_ardour/gain_meter.cc b/gtk2_ardour/gain_meter.cc
index 4368bf809f..a696bbfbb1 100644
--- a/gtk2_ardour/gain_meter.cc
+++ b/gtk2_ardour/gain_meter.cc
@@ -223,11 +223,9 @@ GainMeter::meter_metrics_expose (GdkEventExpose *ev)
/* XXX optimize this so that it doesn't do it all everytime */
double fraction;
-
Glib::RefPtr<Gdk::Window> win (meter_metric_area.get_window());
Glib::RefPtr<Gdk::GC> fg_gc (meter_metric_area.get_style()->get_fg_gc (Gtk::STATE_NORMAL));
Glib::RefPtr<Gdk::GC> bg_gc (meter_metric_area.get_style()->get_bg_gc (Gtk::STATE_NORMAL));
- Pango::FontDescription font (meter_metric_area.get_style()->get_font());
gint x, y, width, height, depth;
gint pos;
int db_points[] = { -50, -10, -3, 0, 6 };
@@ -235,6 +233,8 @@ GainMeter::meter_metrics_expose (GdkEventExpose *ev)
char buf[32];
GdkRectangle base_rect;
GdkRectangle draw_rect;
+ int theight;
+ int twidth;
win->get_geometry (x, y, width, height, depth);
@@ -246,18 +246,22 @@ GainMeter::meter_metrics_expose (GdkEventExpose *ev)
gdk_rectangle_intersect (&ev->area, &base_rect, &draw_rect);
win->draw_rectangle (bg_gc, true, draw_rect.x, draw_rect.y, draw_rect.width, draw_rect.height);
+ Glib::RefPtr<Pango::Layout> layout = meter_metric_area.create_pango_layout("");
+
for (i = 0; i < sizeof (db_points)/sizeof (db_points[0]); ++i) {
+
fraction = log_meter (db_points[i]);
pos = height - (gint) floor (height * fraction);
snprintf (buf, sizeof (buf), "%d", db_points[i]);
- Glib::RefPtr<Pango::Layout> Layout = meter_metric_area.create_pango_layout(buf);
- // GTK2FIX - how to get twidth, ascent
- win->draw_layout(fg_gc, width /* - twidth */, pos /* + ascent */, Layout);
+ layout->set_text (buf);
+ layout->get_pixel_size (twidth, theight);
+
+ win->draw_layout (fg_gc, width - twidth, pos + theight, layout);
}
- return TRUE;
+ return true;
}
GainMeter::~GainMeter ()
@@ -281,7 +285,6 @@ GainMeter::update_meters ()
uint32_t n;
float peak;
char buf[32];
-
for (n = 0, i = meters.begin(); i != meters.end(); ++i, ++n) {
if ((*i).packed) {
diff --git a/libs/ardour/ardour/destructive_filesource.h b/libs/ardour/ardour/destructive_filesource.h
index 7f816a9e6b..0663d7f034 100644
--- a/libs/ardour/ardour/destructive_filesource.h
+++ b/libs/ardour/ardour/destructive_filesource.h
@@ -43,8 +43,18 @@ class DestructiveFileSource : public FileSource {
jack_nframes_t write (Sample *src, jack_nframes_t cnt);
private:
- bool _capture_start;
- bool _capture_end;
+ static jack_nframes_t xfade_frames;
+ static gain_t* out_coefficient;
+ static gain_t* in_coefficient;
+ static void setup_standard_crossfades (jack_nframes_t sample_rate);
+
+ bool _capture_start;
+ bool _capture_end;
+ jack_nframes_t file_pos;
+ Sample* xfade_buf;
+
+ jack_nframes_t crossfade (Sample* data, jack_nframes_t cnt, int dir);
+
};
}
diff --git a/libs/ardour/audiofilter.cc b/libs/ardour/audiofilter.cc
index 6145ef9c83..ce3a103e28 100644
--- a/libs/ardour/audiofilter.cc
+++ b/libs/ardour/audiofilter.cc
@@ -73,7 +73,7 @@ AudioFilter::finish (AudioRegion& region, AudioRegion::SourceList& nsrcs)
now = localtime (&xnow);
for (AudioRegion::SourceList::iterator si = nsrcs.begin(); si != nsrcs.end(); ++si) {
- dynamic_cast<FileSource*>((*si))->update_header (session.transport_frame(), *now, xnow);
+ dynamic_cast<FileSource*>((*si))->update_header (region.position(), *now, xnow);
}
/* create a new region */
diff --git a/libs/ardour/destructive_filesource.cc b/libs/ardour/destructive_filesource.cc
index f0813f61dc..186166e08c 100644
--- a/libs/ardour/destructive_filesource.cc
+++ b/libs/ardour/destructive_filesource.cc
@@ -51,6 +51,7 @@ typedef off_t off64_t;
#endif
#include <errno.h>
+#include <cmath>
#include <pbd/error.h>
#include <ardour/destructive_filesource.h>
@@ -60,9 +61,19 @@ typedef off_t off64_t;
using namespace std;
using namespace ARDOUR;
+gain_t* DestructiveFileSource::out_coefficient = 0;
+gain_t* DestructiveFileSource::in_coefficient = 0;
+jack_nframes_t DestructiveFileSource::xfade_frames = 64;
+
DestructiveFileSource::DestructiveFileSource (string path, jack_nframes_t rate, bool repair_first)
: FileSource (path, rate, repair_first)
{
+ if (out_coefficient == 0) {
+ setup_standard_crossfades (rate);
+ }
+
+ xfade_buf = new Sample[xfade_frames];
+
_capture_start = false;
_capture_end = false;
}
@@ -70,17 +81,42 @@ DestructiveFileSource::DestructiveFileSource (string path, jack_nframes_t rate,
DestructiveFileSource::DestructiveFileSource (const XMLNode& node, jack_nframes_t rate)
: FileSource (node, rate)
{
+ if (out_coefficient == 0) {
+ setup_standard_crossfades (rate);
+ }
+
+ xfade_buf = new Sample[xfade_frames];
+
_capture_start = false;
_capture_end = false;
}
DestructiveFileSource::~DestructiveFileSource()
{
+ delete xfade_buf;
+}
+
+void
+DestructiveFileSource::setup_standard_crossfades (jack_nframes_t rate)
+{
+ xfade_frames = (jack_nframes_t) floor ((/*Config->get_destructive_crossfade_msecs()*/ 64 / 1000.0) * rate);
+
+ out_coefficient = new gain_t[xfade_frames];
+ in_coefficient = new gain_t[xfade_frames];
+
+ for (jack_nframes_t n = 0; n < xfade_frames; ++n) {
+
+ /* XXXX THIS IS NOT THE RIGHT XFADE CURVE: USE A PROPER VOLUMETRIC EQUAL POWER CURVE */
+
+ out_coefficient[n] = n/(gain_t) xfade_frames;
+ in_coefficient[n] = 1.0 - out_coefficient[n];
+ }
}
int
DestructiveFileSource::seek (jack_nframes_t frame)
{
+ file_pos = data_offset + (sizeof (Sample) * frame);
return 0;
}
@@ -104,23 +140,103 @@ DestructiveFileSource::clear_capture_marks ()
}
jack_nframes_t
+DestructiveFileSource::crossfade (Sample* data, jack_nframes_t cnt, int dir)
+{
+ jack_nframes_t xfade = min (xfade_frames, cnt);
+ jack_nframes_t xfade_bytes = xfade * sizeof (Sample);
+
+ if (::pread64 (fd, (char *) xfade_buf, xfade_bytes, file_pos) != (off64_t) xfade_bytes) {
+ error << string_compose(_("FileSource: \"%1\" bad read (%2)"), _path, strerror (errno)) << endmsg;
+ return 0;
+ }
+
+ if (xfade == xfade_frames) {
+
+ /* use the standard xfade curve */
+
+ if (dir) {
+
+ /* fade new material in */
+
+ for (jack_nframes_t n = 0; n < xfade; ++n) {
+ xfade_buf[n] = (xfade_buf[n] * out_coefficient[n]) + (data[n] * in_coefficient[n]);
+ }
+ } else {
+
+ /* fade new material out */
+
+
+ for (jack_nframes_t n = 0; n < xfade; ++n) {
+ xfade_buf[n] = (xfade_buf[n] * in_coefficient[n]) + (data[n] * out_coefficient[n]);
+ }
+ }
+
+
+ } else {
+
+ /* short xfade, compute custom curve */
+
+ for (jack_nframes_t n = 0; n < xfade; ++n) {
+ xfade_buf[n] = (xfade_buf[n] * out_coefficient[n]) + (data[n] * in_coefficient[n]);
+ }
+ }
+
+ if (::pwrite64 (fd, (char *) xfade_buf, xfade, file_pos) != (off64_t) xfade_bytes) {
+ error << string_compose(_("FileSource: \"%1\" bad write (%2)"), _path, strerror (errno)) << endmsg;
+ return 0;
+ }
+
+ /* don't advance file_pos here; if the write fails, we want it left where it was before the overall
+ write, not in the middle of it.
+ */
+
+ if (xfade < cnt) {
+ jack_nframes_t remaining = (cnt - xfade);
+ int32_t bytes = remaining * sizeof (Sample);
+
+ if (::pwrite64 (fd, (char *) data + remaining, bytes, file_pos) != (off64_t) bytes) {
+ error << string_compose(_("FileSource: \"%1\" bad write (%2)"), _path, strerror (errno)) << endmsg;
+ return 0;
+ }
+ }
+
+ file_pos += cnt;
+
+ return cnt;
+}
+
+jack_nframes_t
DestructiveFileSource::write (Sample* data, jack_nframes_t cnt)
{
{
LockMonitor lm (_lock, __LINE__, __FILE__);
int32_t byte_cnt = cnt * sizeof (Sample);
- int32_t byte_pos = data_offset + (_length * sizeof (Sample));
jack_nframes_t oldlen;
- if (::pwrite64 (fd, (char *) data, byte_cnt, byte_pos) != (off64_t) byte_cnt) {
- error << string_compose(_("FileSource: \"%1\" bad write (%2)"), _path, strerror (errno)) << endmsg;
- return 0;
+ if (_capture_start) {
+ _capture_start = false;
+ if (crossfade (data, cnt, 1) != cnt) {
+ return 0;
+ }
+ } else if (_capture_end) {
+ _capture_end = false;
+ if (crossfade (data, cnt, 0) != cnt) {
+ return 0;
+ }
+ } else {
+ if (::pwrite64 (fd, (char *) data, byte_cnt, file_pos) != (off64_t) byte_cnt) {
+ error << string_compose(_("FileSource: \"%1\" bad write (%2)"), _path, strerror (errno)) << endmsg;
+ return 0;
+ }
}
- oldlen = _length;
- _length += cnt;
+ oldlen = file_pos;
+ if (file_pos + cnt > _length) {
+ _length += cnt;
+ }
_write_data_count = byte_cnt;
+ file_pos += byte_cnt;
if (_build_peakfiles) {
PeakBuildRecord *pbr = 0;
diff --git a/libs/ardour/session_timefx.cc b/libs/ardour/session_timefx.cc
index e8c5a54349..b8f0068a91 100644
--- a/libs/ardour/session_timefx.cc
+++ b/libs/ardour/session_timefx.cc
@@ -149,7 +149,7 @@ Session::tempoize_region (TimeStretchRequest& tsr)
xnow = localtime (&now);
for (it = sources.begin(); it != sources.end(); ++it) {
- dynamic_cast<FileSource*>(*it)->update_header (0, *xnow, now);
+ dynamic_cast<FileSource*>(*it)->update_header (tsr.region->position(), *xnow, now);
}
region_name = tsr.region->name() + X_(".t");
diff --git a/libs/gtkmm2ext/click_box.cc b/libs/gtkmm2ext/click_box.cc
index ca8d7f725f..efce988c29 100644
--- a/libs/gtkmm2ext/click_box.cc
+++ b/libs/gtkmm2ext/click_box.cc
@@ -34,6 +34,9 @@ ClickBox::ClickBox (Gtk::Adjustment *adjp, const string &name, bool round_to_ste
{
print_func = default_printer;
print_arg = 0;
+ layout = create_pango_layout ("");
+ twidth = 0;
+ theight = 0;
set_name (name);
add_events (Gdk::BUTTON_RELEASE_MASK|
@@ -85,6 +88,17 @@ ClickBox::default_printer (char buf[32], Gtk::Adjustment &adj,
void
ClickBox::set_label ()
{
+ if (!print_func) {
+ return;
+ }
+
+ char buf[32];
+
+ print_func (buf, get_adjustment(), print_arg);
+
+ layout->set_text (buf);
+ layout->get_pixel_size (twidth, theight);
+
queue_draw ();
}
@@ -102,21 +116,27 @@ ClickBox::on_expose_event (GdkEventExpose *ev)
if (print_func) {
- char buf[32];
-
Glib::RefPtr<Gtk::Style> style (get_style());
-
- print_func (buf, get_adjustment(), print_arg);
-
- Glib::RefPtr <Gdk::Window> win (get_window());
- win->draw_rectangle (style->get_bg_gc(get_state()),
- TRUE, 0, 0, -1, -1);
-
- {
- int width = 0;
- int height = 0;
- create_pango_layout(buf)->get_pixel_size(width, height);
- set_size_request(width, height);
+ Glib::RefPtr<Gdk::GC> fg_gc (style->get_fg_gc (Gtk::STATE_NORMAL));
+ Glib::RefPtr<Gdk::GC> bg_gc (style->get_bg_gc (Gtk::STATE_NORMAL));
+ Glib::RefPtr<Gdk::Window> win (get_window());
+
+ GdkRectangle base_rect;
+ GdkRectangle draw_rect;
+ gint x, y, width, height, depth;
+
+ win->get_geometry (x, y, width, height, depth);
+
+ base_rect.width = width;
+ base_rect.height = height;
+ base_rect.x = 0;
+ base_rect.y = 0;
+
+ gdk_rectangle_intersect (&ev->area, &base_rect, &draw_rect);
+ win->draw_rectangle (bg_gc, true, draw_rect.x, draw_rect.y, draw_rect.width, draw_rect.height);
+
+ if (twidth && theight) {
+ win->draw_layout (fg_gc, width - (twidth + 2), (height - theight) + 2, layout);
}
}
diff --git a/libs/gtkmm2ext/gtkmm2ext/click_box.h b/libs/gtkmm2ext/gtkmm2ext/click_box.h
index 4f1ef5ca6b..c6f2922f3f 100644
--- a/libs/gtkmm2ext/gtkmm2ext/click_box.h
+++ b/libs/gtkmm2ext/gtkmm2ext/click_box.h
@@ -49,6 +49,10 @@ class ClickBox : public Gtk::DrawingArea, public AutoSpin
void (*print_func) (char buf[32], Gtk::Adjustment &, void *);
void *print_arg;
+ Glib::RefPtr<Pango::Layout> layout;
+ int twidth;
+ int theight;
+
void set_label ();
bool button_press_handler (GdkEventButton *);
bool button_release_handler (GdkEventButton *);
diff --git a/libs/midi++2/mmc.cc b/libs/midi++2/mmc.cc
index a0de774329..a7501664f2 100644
--- a/libs/midi++2/mmc.cc
+++ b/libs/midi++2/mmc.cc
@@ -485,10 +485,48 @@ MachineControl::write_track_record_ready (byte *msg, size_t len)
bit 3: aux track a
bit 4: aux track b
+ the format of the message (its an MMC Masked Write) is:
+
+ 0x41 Command Code
+ <count> byte count of following data
+ <name> byte value of the field being written
+ <byte #> byte number of target byte in the
+ bitmap being written to
+ <mask> ones in the mask indicate which bits will be changed
+ <data> new data for the byte being written
+
+ by the time this code is executing, msg[0] is the
+ byte number of the target byte. if its zero, we
+ are writing to a special byte in the standard
+ track bitmap, in which the first 5 bits are
+ special. hence the bits for tracks 1 + 2 are bits
+ 5 and 6 of the first byte of the track
+ bitmap. so:
+
+ change track 1: msg[0] = 0; << first byte of track bitmap
+ msg[1] = 0100000; << binary: bit 5 set
+
+ change track 2: msg[0] = 0; << first byte of track bitmap
+ msg[1] = 1000000; << binary: bit 6 set
+
+ change track 3: msg[0] = 1; << second byte of track bitmap
+ msg[1] = 0000001; << binary: bit 0 set
+
+ the (msg[0] * 7) - 5 computation is an attempt to
+ extract the value of the first track: ie. the one
+ that would be indicated by bit 0 being set.
+
+ so, if msg[0] = 0, msg[1] = 0100000 (binary),
+ what happens is that base_track = -5, but by the
+ time we check the correct bit, n = 5, and so the
+ computed track for the status change is 0 (first
+ track).
+
+ if msg[0] = 1, then the base track for any change is 2 (the third track), and so on.
*/
/* XXX check needed to make sure we don't go outside the
- support number of tracks.
+ supported number of tracks.
*/
base_track = (msg[0] * 7) - 5;
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-19 21:38:38 +0000