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LTC slave rewrite #2

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git-svn-id: svn://localhost/ardour2/branches/3.0@13313 d708f5d6-7413-0410-9779-e7cbd77b26cf
This commit is contained in:
Robin Gareus
2012-10-20 18:14:13 +00:00
parent 2d9ed69fe2
commit 7f8d2e32da
4 changed files with 157 additions and 261 deletions
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60
libs/ardour/ardour/slave.h
View File

@@ -342,63 +342,47 @@ public:
framecnt_t resolution () const;
bool requires_seekahead () const { return false; }
framecnt_t seekahead_distance() const;
bool give_slave_full_control_over_transport_speed() const;
bool give_slave_full_control_over_transport_speed() const { return true; }
Timecode::TimecodeFormat apparent_timecode_format() const;
std::string approximate_current_position() const;
Timecode::TimecodeFormat apparent_timecode_format() const;
std::string approximate_current_position() const;
std::string approximate_current_delta() const;
private:
int parse_ltc(const jack_nframes_t, const jack_default_audio_sample_t * const, const framecnt_t);
bool process_ltc(framepos_t const, framepos_t const, framecnt_t);
void init_ltc_dll(framepos_t const, double const);
void init_engine_dll (framepos_t, framepos_t);
void parse_ltc(const jack_nframes_t, const jack_default_audio_sample_t * const, const framecnt_t);
void process_ltc(framepos_t const);
void init_engine_dll (framepos_t, int32_t);
bool detect_ltc_fps(int, bool);
bool detect_ltc_discontinuity(LTCFrameExt *);
void reset();
Session& session;
bool did_reset_tc_format;
Session& session;
bool did_reset_tc_format;
Timecode::TimecodeFormat saved_tc_format;
LTCDecoder *decoder;
LTCDecoder * decoder;
double frames_per_ltc_frame;
Timecode::Time timecode;
double frames_per_ltc_frame;
bool ltc_discontinuity;
framecnt_t monotonic_cnt;
framecnt_t last_timestamp;
framecnt_t last_ltc_frame;
framepos_t ltc_transport_pos;
double ltc_speed;
frameoffset_t current_delta;
framecnt_t monotonic_cnt;
framecnt_t last_timestamp;
framecnt_t last_ltc_frame;
double ltc_speed;
frameoffset_t current_delta;
int delayedlocked;
int ltc_detect_fps_cnt;
int ltc_detect_fps_max;
int ltc_detect_fps_cnt;
int ltc_detect_fps_max;
bool printed_timecode_warning;
Timecode::TimecodeFormat ltc_timecode;
Timecode::TimecodeFormat a3e_timecode;
bool printed_timecode_warning;
LTCFrame prev_ltc_frame;
uint64_t frames_in_sequence;
int delayedlocked;
/* DLL - chase LTC */
int transport_direction;
int engine_dll_initstate;
double t0; ///< time at the beginning of the MTC quater frame
double t1; ///< calculated end of the MTC quater frame
double e2; ///< second order loop error
double b, c, omega; ///< DLL filter coefficients
/* DLL - sync engine */
int transport_direction;
int engine_dll_initstate;
double te0; ///< time at the beginning of the engine process
double te1; ///< calculated sync time
double ee2; ///< second order loop error
double be, ce, oe; ///< DLL filter coefficients
double b, c; ///< DLL filter coefficients
};
#endif

2
libs/ardour/audioengine.cc
View File

@@ -91,7 +91,7 @@ AudioEngine::AudioEngine (string client_name, string session_uuid)
Port::set_engine (this);
#ifdef HAVE_LTC
_ltc_input = register_port (DataType::AUDIO, _("LTC in"), Port::IsInput);
_ltc_input = register_port (DataType::AUDIO, _("LTC in"), true);
/* As of October 2012, the LTC source port is the only thing that needs
* to care about Config parameters, so don't bother to listen if we're

355
libs/ardour/ltc_slave.cc
View File

@@ -44,25 +44,21 @@ using namespace Timecode;
LTC_Slave::LTC_Slave (Session& s)
: session (s)
{
frames_per_ltc_frame = session.frames_per_timecode_frame(); // XXX at most 30fps ?
frames_per_ltc_frame = session.frames_per_timecode_frame();
timecode.rate = session.timecode_frames_per_second();
timecode.drop = session.timecode_drop_frames();
ltc_transport_pos = 0;
did_reset_tc_format = false;
delayedlocked = 10;
engine_dll_initstate = 0;
monotonic_cnt = 0;
memset(&prev_ltc_frame, 0, sizeof(LTCFrame));
ltc_timecode = timecode_60; // track changes of LTC timecode
a3e_timecode = timecode_60; // track canges of Ardour's timecode
printed_timecode_warning = false;
ltc_detect_fps_cnt = ltc_detect_fps_max = 0;
decoder = ltc_decoder_create((int) frames_per_ltc_frame, 128 /*queue size*/);
reset();
//session.engine().Xrun.connect_same_thread (*this, boost::bind (&LTC_Slave::reset, this));
}
LTC_Slave::~LTC_Slave()
@@ -74,13 +70,6 @@ LTC_Slave::~LTC_Slave()
ltc_decoder_free(decoder);
}
bool
LTC_Slave::give_slave_full_control_over_transport_speed() const
{
return true; // DLL align to engine transport
// return false; // for Session-level computed varispeed
}
ARDOUR::framecnt_t
LTC_Slave::resolution () const
{
@@ -109,28 +98,31 @@ void
LTC_Slave::reset()
{
DEBUG_TRACE (DEBUG::LTC, "LTC reset()\n");
frames_in_sequence = 0;
ltc_detect_fps_cnt = ltc_detect_fps_max = 0;
last_timestamp = 0;
current_delta = 0;
transport_direction = 0;
ltc_speed = 0;
ltc_decoder_queue_flush(decoder);
engine_dll_initstate = 0;
}
int
void
LTC_Slave::parse_ltc(const jack_nframes_t nframes, const jack_default_audio_sample_t * const in, const framecnt_t posinfo)
{
jack_nframes_t i;
unsigned char sound[8192];
if (nframes > 8192) return 1;
if (nframes > 8192) {
/* TODO warn once or wrap, loop conversion below
* does A3 support > 8192 spp anyway?
*/
return;
}
for (i = 0; i < nframes; i++) {
const int snd=(int)rint((127.0*in[i])+128.0);
sound[i] = (unsigned char) (snd&0xff);
}
ltc_decoder_write(decoder, sound, nframes, posinfo);
return 0;
return;
}
bool
@@ -142,6 +134,7 @@ LTC_Slave::detect_ltc_fps(int frameno, bool df)
ltc_detect_fps_max = frameno;
}
ltc_detect_fps_cnt++;
if (ltc_detect_fps_cnt > 60)
{
if (ltc_detect_fps_cnt > ltc_detect_fps_max
@@ -187,8 +180,8 @@ LTC_Slave::detect_ltc_fps(int frameno, bool df)
Timecode::timecode_format_name(cur_timecode),
Timecode::timecode_format_name(tc_format))
<< endmsg;
session.config.set_timecode_format (tc_format);
}
session.config.set_timecode_format (tc_format);
} else {
/* only warn about TC mismatch */
if (ltc_timecode != tc_format) printed_timecode_warning = false;
@@ -208,53 +201,21 @@ LTC_Slave::detect_ltc_fps(int frameno, bool df)
return false;
}
bool
LTC_Slave::detect_ltc_discontinuity(LTCFrameExt *frame) {
bool discontinuity_detected = false;
/* detect discontinuities */
if (frame->reverse) {
ltc_frame_decrement(&prev_ltc_frame, ceil(timecode.rate), 0);
} else {
ltc_frame_increment(&prev_ltc_frame, ceil(timecode.rate), 0);
}
if (memcmp(&prev_ltc_frame, &frame->ltc, sizeof(LTCFrame))) {
discontinuity_detected = true;
}
memcpy(&prev_ltc_frame, &frame->ltc, sizeof(LTCFrame));
/* notfify about discontinuities */
if (frames_in_sequence > 0 && discontinuity_detected) {
DEBUG_TRACE (DEBUG::LTC, "# LTC DISCONTINUITY\n");
frames_in_sequence=0;
return true;
}
frames_in_sequence++;
return false;
}
bool
LTC_Slave::process_ltc(framepos_t const now, framepos_t const sess_pos, framecnt_t const nframes)
void
LTC_Slave::process_ltc(framepos_t const now)
{
bool have_frame = false;
DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC Process eng-tme: %1 eng-pos: %2\n", now, sess_pos));
LTCFrameExt frame;
while (ltc_decoder_read(decoder,&frame)) {
bool reinitialize_ltc_dll = false;
while (ltc_decoder_read(decoder, &frame)) {
SMPTETimecode stime;
ltc_frame_to_time(&stime, &frame.ltc, 0);
timecode.negative = false;
timecode.subframes = 0;
/* set timecode.rate and timecode.drop: */
if (detect_ltc_fps(stime.frame, (frame.ltc.dfbit)? true : false)) {
reset();
break;
}
if (detect_ltc_discontinuity(&frame)) {
ltc_discontinuity = true;
last_timestamp = 0;
}
#if 0 // Devel/Debug
@@ -268,20 +229,8 @@ LTC_Slave::process_ltc(framepos_t const now, framepos_t const sess_pos, framecnt
frame.off_end,
frame.reverse ? " R" : " "
);
if (frames_in_sequence < 1) {
fprintf(stdout, " ####### FIRST LTC FRAME in SEQ #######\n");
}
if (ltc_discontinuity) {
fprintf(stdout, " ####### LTC DISCONTINUITY #######\n");
}
#endif
if (frames_in_sequence < 1) {
continue;
}
/* when a full LTC frame is decoded, the timecode the LTC frame
* is referring has just passed.
* So we send the _next_ timecode which
@@ -291,11 +240,13 @@ LTC_Slave::process_ltc(framepos_t const now, framepos_t const sess_pos, framecnt
if (!frame.reverse) {
ltc_frame_increment(&frame.ltc, fps_i , 0);
ltc_frame_to_time(&stime, &frame.ltc, 0);
transport_direction = 1;
} else {
ltc_frame_decrement(&frame.ltc, fps_i , 0);
int off = frame.off_end - frame.off_start;
frame.off_start += off;
frame.off_end += off;
transport_direction = -1;
}
timecode.hours = stime.hours;
@@ -311,210 +262,172 @@ LTC_Slave::process_ltc(framepos_t const now, framepos_t const sess_pos, framecnt
session.config.get_timecode_offset_negative(), session.config.get_timecode_offset()
);
/* (frame.off_end + 1) = start of next LTC frame */
double poff = (frame.off_end + 1 - now);
ltc_transport_pos = ltc_frame - poff;
#if 0 // vari-speed LTC, no DLL
frames_per_ltc_frame = 1 + frame.off_end - frame.off_start;
#else
frames_per_ltc_frame = (double(session.frame_rate()) / timecode.rate);
#endif
DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC frame: %1 poff: %2 pos: %3\n", ltc_frame, poff, ltc_transport_pos));
if (ltc_discontinuity) {
ltc_discontinuity=false;
if (ltc_speed==0
|| !locked()
|| (ltc_transport_pos - sess_pos) > FLYWHEEL_TIMEOUT)
{
engine_dll_initstate = 0;
reset();
}
reinitialize_ltc_dll = true;
}
if (last_timestamp == 0
|| ((now - last_timestamp) > FLYWHEEL_TIMEOUT)
|| (abs(ltc_transport_pos - sess_pos) > frames_per_ltc_frame)
|| (frame.reverse && transport_direction != -1)
|| (!frame.reverse && transport_direction != 1)
) {
reinitialize_ltc_dll = true;
engine_dll_initstate = 0;
reset();
}
if (reinitialize_ltc_dll) {
init_ltc_dll(ltc_transport_pos, frames_per_ltc_frame);
if (ltc_speed==0 || !locked()) {
if (frame.reverse) {
transport_direction = -1;
ltc_transport_pos -= nframes * rint((2 * frames_per_ltc_frame + poff)/nframes);
} else {
transport_direction = 1;
ltc_transport_pos += nframes * rint((2 * frames_per_ltc_frame + poff)/nframes);
}
}
framepos_t cur_timestamp = frame.off_end + 1;
DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC F: %1 LF: %2 N: %3 L: %4\n", ltc_frame, last_ltc_frame, cur_timestamp, last_timestamp));
if (frame.off_end + 1 <= last_timestamp || last_timestamp == 0) {
DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC speed: UNCHANGED: %1\n", ltc_speed));
} else {
// update DLL
double e = (double(ltc_frame) - poff - double(sess_pos));
t0 = t1;
t1 += b * e + e2;
e2 += c * e;
ltc_speed = (t1 - t0) / frames_per_ltc_frame;
//current_delta = (ltc_transport_pos - sess_pos);
DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC DLL t0:%1 t1:%2 err:%3 spd:%4 ddt:%5\n", t0, t1, e, ltc_speed, e2 - frames_per_ltc_frame));
ltc_speed = double(ltc_frame - last_ltc_frame) / double(cur_timestamp - last_timestamp);
DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC speed: %1\n", ltc_speed));
}
if (fabs(ltc_speed) > 10.0) {
ltc_speed = 0;
}
/* the are equivalent
* TODO: choose the value with larger diff ->
* minimize roundig errors when extrapolating
*/
#if 1
last_timestamp = now;
last_ltc_frame = ltc_transport_pos;
#else
last_timestamp = frame.off_end + 1;
last_ltc_frame = ltc_frame;
#endif
have_frame = true;
} /* end foreach decoded LTC frame */
return have_frame;
}
void
LTC_Slave::init_ltc_dll(framepos_t const tme, double const dt)
LTC_Slave::init_engine_dll (framepos_t pos, int32_t inc)
{
omega = 2.0 * M_PI * (2.0 * dt) / double(session.frame_rate());
double omega = 2.0 * M_PI * double(inc) / double(session.frame_rate());
b = 1.4142135623730950488 * omega;
c = omega * omega;
e2 = dt;
t0 = double(tme);
e2 = double(ltc_speed * inc);
t0 = double(pos);
t1 = t0 + e2;
DEBUG_TRACE (DEBUG::LTC, string_compose ("[re-]init LTC DLL %1 %2 %3\n", t0, t1, e2));
}
void
LTC_Slave::init_engine_dll (framepos_t pos, framepos_t inc)
{
/* the bandwidth of the DLL is a trade-off,
* because the max-speed of the transport in ardour is
* limited to +-8.0, a larger bandwidth would cause oscillations
*
* But this is only really a problem if the user performs manual
* seeks while transport is running and slaved to LTC.
*/
oe = 2.0 * M_PI * double(inc) / double(session.frame_rate());
be = 1.4142135623730950488 * oe;
ce = oe * oe;
ee2 = double(transport_direction * inc);
te0 = double(pos);
te1 = te0 + ee2;
DEBUG_TRACE (DEBUG::LTC, string_compose ("[re-]init Engine DLL %1 %2 %3\n", te0, te1, ee2));
DEBUG_TRACE (DEBUG::LTC, string_compose ("[re-]init Engine DLL %1 %2 %3\n", t0, t1, e2));
}
/* main entry point from session_process.cc
* called from jack_process callback context
* so it is OK to use jack_port_get_buffer() etc
* so it is OK to use jack_port_get_buffer()
*/
bool
LTC_Slave::speed_and_position (double& speed, framepos_t& pos)
{
//framepos_t now = session.engine().frame_time_at_cycle_start();
//framepos_t now = session.engine().processed_frames();
framepos_t now = monotonic_cnt;
bool engine_init_called = false;
framepos_t now = session.engine().frame_time_at_cycle_start();
framepos_t sess_pos = session.transport_frame(); // corresponds to now
framecnt_t nframes = session.engine().frames_per_cycle();
jack_default_audio_sample_t *in;
jack_latency_range_t ltc_latency;
monotonic_cnt += nframes;
boost::shared_ptr<Port> ltcport = session.engine().ltc_input_port();
ltcport->get_connected_latency_range(ltc_latency, false);
in = (jack_default_audio_sample_t*) jack_port_get_buffer (ltcport->jack_port(), nframes);
DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC_Slave::speed_and_position - TID:%1 | latency: %2\n", ::pthread_self(), ltc_latency.max));
frameoffset_t skip = now - (monotonic_cnt + nframes);
monotonic_cnt = now;
DEBUG_TRACE (DEBUG::LTC, string_compose ("speed_and_position - TID:%1 | latency: %2 | skip %3\n", ::pthread_self(), ltc_latency.max, skip));
if (last_timestamp == 0) {
engine_dll_initstate = 0;
delayedlocked++;
}
else if (engine_dll_initstate != transport_direction) {
else if (engine_dll_initstate != transport_direction && ltc_speed != 0) {
engine_dll_initstate = transport_direction;
init_engine_dll(last_ltc_frame, session.engine().frames_per_cycle());
init_engine_dll(last_ltc_frame + rint(ltc_speed * double(2 * nframes + now - last_timestamp)),
session.engine().frames_per_cycle());
engine_init_called = true;
}
if (in) {
parse_ltc(nframes, in, now + ltc_latency.max );
if (!process_ltc(now, sess_pos, nframes) && ltc_speed != 0) {
DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC Process eng-tme: %1 eng-pos: %2\n", now, sess_pos));
/* when the jack-graph changes and if ardour performs
* locates, the audioengine is stopped (skipping frames) while
* jack [time] moves along.
*/
if (skip > 0) {
DEBUG_TRACE (DEBUG::LTC, string_compose("engine skipped %1 frames. Feeding silence to LTC parser.\n", skip));
if (skip >= 8192) skip = 8192;
unsigned char sound[8192];
memset(sound, 0, sizeof(char) * skip);
ltc_decoder_write(decoder, sound, nframes, now);
} else if (skip != 0) {
/* this should never happen. it may if monotonic_cnt, now overflow on 64bit */
DEBUG_TRACE (DEBUG::LTC, string_compose("engine skipped %1 frames\n", skip));
reset();
}
parse_ltc(nframes, in, now + ltc_latency.max );
process_ltc(now);
}
if (last_timestamp == 0) {
DEBUG_TRACE (DEBUG::LTC, "last timestamp == 0\n");
speed = 0;
pos = session.transport_frame();
return true;
} else if (ltc_speed != 0) {
delayedlocked = 0;
}
if (abs(now - last_timestamp) > FLYWHEEL_TIMEOUT) {
DEBUG_TRACE (DEBUG::LTC, "flywheel timeout\n");
reset();
speed = 0;
pos = session.transport_frame();
return true;
}
/* it take 2 cycles from naught to rolling.
* during these to initial cycles the speed == 0
*
* the first cycle:
* DEBUG::Slave: slave stopped, move to NNN
* DEBUG::Transport: Request forced locate to NNN
* DEBUG::Slave: slave state 0 @ NNN speed 0 cur delta VERY-LARGE-DELTA avg delta 1800
* DEBUG::Slave: silent motion
* DEBUG::Transport: realtime stop @ NNN
* DEBUG::Transport: Butler transport work, todo = PostTransportStop,PostTransportLocate,PostTransportClearSubstate
*
* [engine skips frames to locate, jack time keeps rolling on]
*
* the second cycle:
*
* DEBUG::LTC: [re-]init Engine DLL
* DEBUG::Slave: slave stopped, move to NNN+
* ...
*
* we need to seek two cycles ahead: 2 * nframes
*/
if (engine_dll_initstate == 0) {
DEBUG_TRACE (DEBUG::LTC, "engine DLL not initialized. ltc_speed\n");
speed = 0;
pos = last_ltc_frame + rint(ltc_speed * double(2 * nframes + now - last_timestamp));
return true;
}
/* interpolate position according to speed and time since last LTC-frame*/
double speed_flt = ltc_speed;
framecnt_t elapsed;
if (speed_flt == 0.0f) {
elapsed = 0;
double elapsed = (now - last_timestamp) * speed_flt;
if (!engine_init_called) {
const double e = elapsed + double (last_ltc_frame - sess_pos);
t0 = t1;
t1 += b * e + e2;
e2 += c * e;
speed_flt = (t1 - t0) / double(session.engine().frames_per_cycle());
DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC engine DLL t0:%1 t1:%2 err:%3 spd:%4 ddt:%5\n", t0, t1, e, speed_flt, e2 - session.engine().frames_per_cycle() ));
} else {
/* scale elapsed time by the current LTC speed */
if (last_timestamp && (now > last_timestamp)) {
elapsed = (now - last_timestamp) * speed_flt;
} else {
elapsed = 0;
}
/* update engine DLL and calculate speed */
const double e = double (last_ltc_frame + elapsed - sess_pos);
te0 = te1;
te1 += be * e + ee2;
ee2 += ce * e;
speed_flt = (te1 - te0) / double(session.engine().frames_per_cycle());
DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC engine DLL t0:%1 t1:%2 err:%3 spd:%4 ddt:%5\n", te0, te1, e, speed_flt, ee2 - session.engine().frames_per_cycle() ));
DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC adjusting elapsed (no DLL) from %1 by %2\n", elapsed, (2 * nframes * ltc_speed)));
speed_flt = 0;
elapsed += 2.0 * nframes * ltc_speed; /* see note above */
}
pos = last_ltc_frame + elapsed;
pos = last_ltc_frame + rint(elapsed);
speed = speed_flt;
current_delta = (pos - sess_pos);
if (((pos < 0) || (labs(current_delta) > 2 * session.frame_rate()))) {
DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC large drift: %1\n", current_delta));
reset();
speed = 0;
pos = session.transport_frame();
return true;
}
DEBUG_TRACE (DEBUG::LTC, string_compose ("LTCsync spd: %1 pos: %2 | last-pos: %3 elapsed: %4 delta: %5\n",
speed, pos, last_ltc_frame, elapsed, current_delta));
if (last_timestamp != 0 /* && frames_in_sequence > 8*/) {
delayedlocked = 0;
}
if (last_timestamp == 0 || ((now - last_timestamp) > FLYWHEEL_TIMEOUT)) {
DEBUG_TRACE (DEBUG::LTC, "LTC no-signal - reset\n");
reset();
engine_dll_initstate = 0;
speed = 0;
pos = session.transport_frame();
return true;
}
if (last_timestamp != 0 && ltc_speed != 0 && ((ltc_transport_pos < 0) || (labs(current_delta) > 10 * session.frame_rate()))) {
DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC large drift. %1\n", current_delta));
// XXX only re-init engine DLL ?
reset();
engine_dll_initstate = 0;
speed = 0;
pos = session.transport_frame();
return true;
}
#if 0
/* provide a 1% deadzone to lock the speed */
if (fabs(speed - 1.0) <= 0.01)
#if 1 /* provide a .1% deadzone to lock the speed */
if (fabs(speed - 1.0) <= 0.001)
speed = 1.0;
#endif
@@ -554,13 +467,11 @@ std::string
LTC_Slave::approximate_current_delta() const
{
char delta[24];
if (last_timestamp == 0 || frames_in_sequence < 2) {
if (last_timestamp == 0 || engine_dll_initstate == 0) {
snprintf(delta, sizeof(delta), "\u2012\u2012\u2012\u2012");
} else if ((monotonic_cnt - last_timestamp) > 2 * frames_per_ltc_frame) {
snprintf(delta, sizeof(delta), "flywheel");
} else {
// TODO if current_delta > 1 frame -> display timecode.
// delta >0 if A3's transport is _behind_ LTC
snprintf(delta, sizeof(delta), "%s%4" PRIi64 " sm",
PLUSMINUS(-current_delta), abs(current_delta));
}

1
libs/ardour/session_process.cc
View File

@@ -666,6 +666,7 @@ Session::track_slave_state (float slave_speed, framepos_t slave_transport_frame,
}
if (slave_transport_frame != _transport_frame) {
DEBUG_TRACE (DEBUG::Slave, string_compose ("require locate to run. eng: %1 -> sl: %2\n", _transport_frame, slave_transport_frame));
locate (slave_transport_frame, false, false);
}
_slave_state = Running;