diff options
Diffstat (limited to 'libs/ardour/session_ltc.cc')
| -rw-r--r-- | libs/ardour/session_ltc.cc | 120 |
1 files changed, 60 insertions, 60 deletions
diff --git a/libs/ardour/session_ltc.cc b/libs/ardour/session_ltc.cc index 8acb16dde3..ae18c43ac9 100644 --- a/libs/ardour/session_ltc.cc +++ b/libs/ardour/session_ltc.cc @@ -68,19 +68,19 @@ Session::ltc_tx_initialize() ltc_enc_tcformat = config.get_timecode_format(); ltc_tx_parse_offset(); - DEBUG_TRACE (DEBUG::LTC, string_compose("LTC TX init sr: %1 fps: %2\n", nominal_frame_rate(), timecode_to_frames_per_second(ltc_enc_tcformat))); - ltc_encoder = ltc_encoder_create(nominal_frame_rate(), + DEBUG_TRACE (DEBUG::LTC, string_compose("LTC TX init sr: %1 fps: %2\n", nominal_sample_rate(), timecode_to_frames_per_second(ltc_enc_tcformat))); + ltc_encoder = ltc_encoder_create(nominal_sample_rate(), timecode_to_frames_per_second(ltc_enc_tcformat), TV_STANDARD(ltc_enc_tcformat), 0); - ltc_encoder_set_bufsize(ltc_encoder, nominal_frame_rate(), 23.0); + ltc_encoder_set_bufsize(ltc_encoder, nominal_sample_rate(), 23.0); ltc_encoder_set_filter(ltc_encoder, LTC_RISE_TIME(1.0)); - /* buffersize for 1 LTC frame: (1 + sample-rate / fps) bytes + /* buffersize for 1 LTC sample: (1 + sample-rate / fps) bytes * usually returned by ltc_encoder_get_buffersize(encoder) * * since the fps can change and A3's min fps: 24000/1001 */ - ltc_enc_buf = (ltcsnd_sample_t*) calloc((nominal_frame_rate() / 23), sizeof(ltcsnd_sample_t)); + ltc_enc_buf = (ltcsnd_sample_t*) calloc((nominal_sample_rate() / 23), sizeof(ltcsnd_sample_t)); ltc_speed = 0; ltc_prev_cycle = -1; ltc_tx_reset(); @@ -153,7 +153,7 @@ Session::ltc_tx_recalculate_position() a3tc.drop = timecode_has_drop_frames(ltc_enc_tcformat); Timecode::timecode_to_sample (a3tc, ltc_enc_pos, true, false, - (double)frame_rate(), + (double)sample_rate(), config.get_subframes_per_frame(), ltc_timecode_negative_offset, ltc_timecode_offset ); @@ -161,7 +161,7 @@ Session::ltc_tx_recalculate_position() } void -Session::ltc_tx_send_time_code_for_cycle (framepos_t start_frame, framepos_t end_frame, +Session::ltc_tx_send_time_code_for_cycle (samplepos_t start_sample, samplepos_t end_sample, double target_speed, double current_speed, pframes_t nframes) { @@ -203,18 +203,18 @@ Session::ltc_tx_send_time_code_for_cycle (framepos_t start_frame, framepos_t end /* range from libltc (38..218) || - 128.0 -> (-90..90) */ const float ltcvol = Config->get_ltc_output_volume()/(90.0); // pow(10, db/20.0)/(90.0); - DEBUG_TRACE (DEBUG::LTC, string_compose("LTC TX %1 to %2 / %3 | lat: %4\n", start_frame, end_frame, nframes, ltc_out_latency.max)); + DEBUG_TRACE (DEBUG::LTC, string_compose("LTC TX %1 to %2 / %3 | lat: %4\n", start_sample, end_sample, nframes, ltc_out_latency.max)); /* all systems go. Now here's the plan: * * 1) check if fps has changed * 2) check direction of encoding, calc speed, re-sample existing buffer - * 3) calculate frame and byte to send aligned to jack-period size - * 4) check if it's the frame/byte that is already in the queue - * 5) if (4) mismatch, re-calculate offset of LTC frame relative to period size + * 3) calculate sample and byte to send aligned to jack-period size + * 4) check if it's the sample/byte that is already in the queue + * 5) if (4) mismatch, re-calculate offset of LTC sample relative to period size * 6) actual LTC audio output - * 6a) send remaining part of already queued frame; break on nframes - * 6b) encode new LTC-frame byte + * 6a) send remaining part of already queued sample; break on nframes + * 6b) encode new LTC-sample byte * 6c) goto 6a * 7) done */ @@ -222,8 +222,8 @@ Session::ltc_tx_send_time_code_for_cycle (framepos_t start_frame, framepos_t end // (1) check fps TimecodeFormat cur_timecode = config.get_timecode_format(); if (cur_timecode != ltc_enc_tcformat) { - DEBUG_TRACE (DEBUG::LTC, string_compose("LTC TX1: TC format mismatch - reinit sr: %1 fps: %2\n", nominal_frame_rate(), timecode_to_frames_per_second(cur_timecode))); - if (ltc_encoder_reinit(ltc_encoder, nominal_frame_rate(), + DEBUG_TRACE (DEBUG::LTC, string_compose("LTC TX1: TC format mismatch - reinit sr: %1 fps: %2\n", nominal_sample_rate(), timecode_to_frames_per_second(cur_timecode))); + if (ltc_encoder_reinit(ltc_encoder, nominal_sample_rate(), timecode_to_frames_per_second(cur_timecode), TV_STANDARD(cur_timecode), 0 )) { @@ -245,7 +245,7 @@ Session::ltc_tx_send_time_code_for_cycle (framepos_t start_frame, framepos_t end // (2) speed & direction /* speed 0 aka transport stopped is interpreted as rolling forward. - * keep repeating current frame + * keep repeating current sample */ #define SIGNUM(a) ( (a) < 0 ? -1 : 1) bool speed_changed = false; @@ -263,36 +263,36 @@ Session::ltc_tx_send_time_code_for_cycle (framepos_t start_frame, framepos_t end * buffer. * * The timecode is generated directly in the Session process callback - * using _transport_frame. It requires that the session has set the + * using _transport_sample. It requires that the session has set the * port's playback latency to worst_playback_latency() prior to * calling ltc_tx_send_time_code_for_cycle(). */ - framepos_t cycle_start_frame; + samplepos_t cycle_start_sample; if (current_speed < 0) { - cycle_start_frame = (start_frame - ltc_out_latency.max + worst_playback_latency()); + cycle_start_sample = (start_sample - ltc_out_latency.max + worst_playback_latency()); } else if (current_speed > 0) { - cycle_start_frame = (start_frame + ltc_out_latency.max - worst_playback_latency()); + cycle_start_sample = (start_sample + ltc_out_latency.max - worst_playback_latency()); } else { /* There is no need to compensate for latency when not rolling * rather send the accurate NOW timecode * (LTC encoder compenates latency by sending earlier timecode) */ - cycle_start_frame = start_frame; + cycle_start_sample = start_sample; } /* LTC TV standard offset */ if (current_speed != 0) { /* ditto - send "NOW" if not rolling */ - cycle_start_frame -= ltc_frame_alignment(samples_per_timecode_frame(), TV_STANDARD(cur_timecode)); + cycle_start_sample -= ltc_frame_alignment(samples_per_timecode_frame(), TV_STANDARD(cur_timecode)); } /* cycle-start may become negative due to latency compensation */ - if (cycle_start_frame < 0) { cycle_start_frame = 0; } + if (cycle_start_sample < 0) { cycle_start_sample = 0; } - double new_ltc_speed = (double)(labs(end_frame - start_frame) * SIGNUM(current_speed)) / (double)nframes; - if (nominal_frame_rate() != frame_rate()) { - new_ltc_speed *= (double)nominal_frame_rate() / (double)frame_rate(); + double new_ltc_speed = (double)(labs(end_sample - start_sample) * SIGNUM(current_speed)) / (double)nframes; + if (nominal_sample_rate() != sample_rate()) { + new_ltc_speed *= (double)nominal_sample_rate() / (double)sample_rate(); } if (SIGNUM(new_ltc_speed) != SIGNUM (ltc_speed)) { @@ -302,7 +302,7 @@ Session::ltc_tx_send_time_code_for_cycle (framepos_t start_frame, framepos_t end if (ltc_speed != new_ltc_speed /* but only once if, current_speed changes to 0. In that case - * new_ltc_speed is > 0 because (end_frame - start_frame) == jack-period for no-roll + * new_ltc_speed is > 0 because (end_sample - start_sample) == jack-period for no-roll * but ltc_speed will still be 0 */ && (current_speed != 0 || ltc_speed != current_speed) @@ -312,8 +312,8 @@ Session::ltc_tx_send_time_code_for_cycle (framepos_t start_frame, framepos_t end * * However, currency in A3 target_speed == current_speed for each process cycle * (except for the sign and if target_speed > 8.0). - * Besides, above speed calculation uses the difference (end_frame - start_frame). - * end_frame is calculated from 'frames_moved' which includes the interpolation. + * Besides, above speed calculation uses the difference (end_sample - start_sample). + * end_sample is calculated from 'samples_moved' which includes the interpolation. * so we're good. */ DEBUG_TRACE (DEBUG::LTC, string_compose("LTC TX2: speed change old: %1 cur: %2 tgt: %3 ctd: %4\n", ltc_speed, current_speed, target_speed, fabs(current_speed) - target_speed, new_ltc_speed)); @@ -321,9 +321,9 @@ Session::ltc_tx_send_time_code_for_cycle (framepos_t start_frame, framepos_t end ltc_encoder_set_filter(ltc_encoder, LTC_RISE_TIME(new_ltc_speed)); } - if (end_frame == start_frame || fabs(current_speed) < 0.1 ) { + if (end_sample == start_sample || fabs(current_speed) < 0.1 ) { DEBUG_TRACE (DEBUG::LTC, "LTC TX2: transport is not rolling or absolute-speed < 0.1\n"); - /* keep repeating current frame + /* keep repeating current sample * * an LTC generator must be able to continue generating LTC when Ardours transport is in stop * some machines do odd things if LTC goes away: @@ -336,8 +336,8 @@ Session::ltc_tx_send_time_code_for_cycle (framepos_t start_frame, framepos_t end ltc_speed = new_ltc_speed; return; } - if (start_frame != ltc_prev_cycle) { - DEBUG_TRACE (DEBUG::LTC, string_compose("LTC TX2: no-roll seek from %1 to %2 (%3)\n", ltc_prev_cycle, start_frame, cycle_start_frame)); + if (start_sample != ltc_prev_cycle) { + DEBUG_TRACE (DEBUG::LTC, string_compose("LTC TX2: no-roll seek from %1 to %2 (%3)\n", ltc_prev_cycle, start_sample, cycle_start_sample)); ltc_tx_reset(); } } @@ -423,37 +423,37 @@ Session::ltc_tx_send_time_code_for_cycle (framepos_t start_frame, framepos_t end } } - ltc_prev_cycle = start_frame; + ltc_prev_cycle = start_sample; ltc_speed = new_ltc_speed; DEBUG_TRACE (DEBUG::LTC, string_compose("LTC TX2: transport speed %1.\n", ltc_speed)); // (3) bit/sample alignment Timecode::Time tc_start; - framepos_t tc_sample_start; + samplepos_t tc_sample_start; /* calc timecode frame from current position - round down to nearest timecode */ - Timecode::sample_to_timecode(cycle_start_frame, tc_start, true, false, + Timecode::sample_to_timecode(cycle_start_sample, tc_start, true, false, timecode_frames_per_second(), timecode_drop_frames(), - (double)frame_rate(), + (double)sample_rate(), config.get_subframes_per_frame(), ltc_timecode_negative_offset, ltc_timecode_offset ); /* convert timecode back to sample-position */ Timecode::timecode_to_sample (tc_start, tc_sample_start, true, false, - (double)frame_rate(), + (double)sample_rate(), config.get_subframes_per_frame(), ltc_timecode_negative_offset, ltc_timecode_offset ); - /* difference between current frame and TC frame in samples */ - frameoffset_t soff = cycle_start_frame - tc_sample_start; + /* difference between current sample and TC sample in samples */ + sampleoffset_t soff = cycle_start_sample - tc_sample_start; if (current_speed == 0) { soff = 0; } DEBUG_TRACE (DEBUG::LTC, string_compose("LTC TX3: A3cycle: %1 = A3tc: %2 +off: %3\n", - cycle_start_frame, tc_sample_start, soff)); + cycle_start_sample, tc_sample_start, soff)); // (4) check if alignment matches @@ -475,7 +475,7 @@ Session::ltc_tx_send_time_code_for_cycle (framepos_t start_frame, framepos_t end maxdiff = slave()->resolution(); } else { maxdiff = ceil(fabs(ltc_speed))*2.0; - if (nominal_frame_rate() != frame_rate()) { + if (nominal_sample_rate() != sample_rate()) { maxdiff *= 3.0; } if (ltc_enc_tcformat == Timecode::timecode_23976 || ltc_enc_tcformat == Timecode::timecode_24976) { @@ -488,18 +488,18 @@ Session::ltc_tx_send_time_code_for_cycle (framepos_t start_frame, framepos_t end DEBUG_TRACE (DEBUG::LTC, string_compose("LTC TX4: enc-pos: %1 | d: %2\n", ltc_enc_pos + ltc_enc_cnt - poff, - rint(ltc_enc_pos + ltc_enc_cnt - poff) - cycle_start_frame + rint(ltc_enc_pos + ltc_enc_cnt - poff) - cycle_start_sample )); - const framecnt_t wrap24h = 86400. * frame_rate(); + const samplecnt_t wrap24h = 86400. * sample_rate(); if (ltc_enc_pos < 0 - || (ltc_speed != 0 && fabs(fmod(ceil(ltc_enc_pos + ltc_enc_cnt - poff), wrap24h) - (cycle_start_frame % wrap24h)) > maxdiff) + || (ltc_speed != 0 && fabs(fmod(ceil(ltc_enc_pos + ltc_enc_cnt - poff), wrap24h) - (cycle_start_sample % wrap24h)) > maxdiff) ) { // (5) re-align ltc_tx_reset(); - /* set frame to encode */ + /* set sample to encode */ SMPTETimecode tc; tc.hours = tc_start.hours % 24; tc.mins = tc_start.minutes; @@ -507,8 +507,8 @@ Session::ltc_tx_send_time_code_for_cycle (framepos_t start_frame, framepos_t end tc.frame = tc_start.frames; ltc_encoder_set_timecode(ltc_encoder, &tc); - /* workaround for libltc recognizing 29.97 and 30000/1001 as drop-frame TC. - * In A3 30000/1001 or 30 fps can be drop-frame. + /* workaround for libltc recognizing 29.97 and 30000/1001 as drop-sample TC. + * In A3 30000/1001 or 30 fps can be drop-sample. */ LTCFrame ltcframe; ltc_encoder_get_frame(ltc_encoder, <cframe); @@ -516,7 +516,7 @@ Session::ltc_tx_send_time_code_for_cycle (framepos_t start_frame, framepos_t end ltc_encoder_set_frame(ltc_encoder, <cframe); - DEBUG_TRACE (DEBUG::LTC, string_compose("LTC TX4: now: %1 trs: %2 toff %3\n", cycle_start_frame, tc_sample_start, soff)); + DEBUG_TRACE (DEBUG::LTC, string_compose("LTC TX4: now: %1 trs: %2 toff %3\n", cycle_start_sample, tc_sample_start, soff)); int32_t cyc_off; if (soff < 0 || soff >= fptcf) { @@ -572,7 +572,7 @@ Session::ltc_tx_send_time_code_for_cycle (framepos_t start_frame, framepos_t end else if (ltc_speed != 0 && (fptcf / ltc_speed / 80) > 3 ) { /* reduce (low freq) jitter. * The granularity of the LTC encoder speed is 1 byte = - * (frames-per-timecode-frame / 10) audio-samples. + * (samples-per-timecode-sample / 10) audio-samples. * Thus, tiny speed changes [as produced by some slaves] * may not have any effect in the cycle when they occur, * but they will add up over time. @@ -582,12 +582,12 @@ Session::ltc_tx_send_time_code_for_cycle (framepos_t start_frame, framepos_t end * * However, for very fast speeds - when 1 LTC bit is * <= 3 audio-sample - adjusting speed may lead to - * invalid frames. + * invalid samples. * * To do better than this, resampling (or a rewrite of the * encoder) is required. */ - ltc_speed -= fmod(((ltc_enc_pos + ltc_enc_cnt - poff) - cycle_start_frame), wrap24h) / engine().sample_rate(); + ltc_speed -= fmod(((ltc_enc_pos + ltc_enc_cnt - poff) - cycle_start_sample), wrap24h) / engine().sample_rate(); } @@ -626,14 +626,14 @@ Session::ltc_tx_send_time_code_for_cycle (framepos_t start_frame, framepos_t end } } - int enc_frames; + int enc_samples; if (restarting) { - /* write zero bytes -- don't touch encoder until we're at a frame-boundary + /* write zero bytes -- don't touch encoder until we're at a sample-boundary * otherwise the biphase polarity may be inverted. */ - enc_frames = fptcf / 10.0; - memset(<c_enc_buf[ltc_buf_len], 127, enc_frames * sizeof(ltcsnd_sample_t)); + enc_samples = fptcf / 10.0; + memset(<c_enc_buf[ltc_buf_len], 127, enc_samples * sizeof(ltcsnd_sample_t)); } else { if (ltc_encoder_encode_byte(ltc_encoder, ltc_enc_byte, (ltc_speed==0)?1.0:(1.0/ltc_speed))) { DEBUG_TRACE (DEBUG::LTC, string_compose("LTC TX6.3 encoder error byte %1\n", ltc_enc_byte)); @@ -641,20 +641,20 @@ Session::ltc_tx_send_time_code_for_cycle (framepos_t start_frame, framepos_t end ltc_tx_reset(); return; } - enc_frames = ltc_encoder_get_buffer(ltc_encoder, &(ltc_enc_buf[ltc_buf_len])); + enc_samples = ltc_encoder_get_buffer(ltc_encoder, &(ltc_enc_buf[ltc_buf_len])); } #ifdef LTC_GEN_FRAMEDBUG - DEBUG_TRACE (DEBUG::LTC, string_compose("LTC TX6.3 encoded %1 bytes for LTC-byte %2 at spd %3\n", enc_frames, ltc_enc_byte, ltc_speed)); + DEBUG_TRACE (DEBUG::LTC, string_compose("LTC TX6.3 encoded %1 bytes for LTC-byte %2 at spd %3\n", enc_samples, ltc_enc_byte, ltc_speed)); #endif - if (enc_frames <=0) { + if (enc_samples <=0) { DEBUG_TRACE (DEBUG::LTC, "LTC TX6.3 encoder empty buffer.\n"); ltc_encoder_buffer_flush(ltc_encoder); ltc_tx_reset(); return; } - ltc_buf_len += enc_frames; + ltc_buf_len += enc_samples; if (ltc_speed < 0) ltc_enc_cnt -= fptcf/10.0; else |