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move sample/timecode conversion to libtimecode.

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git-svn-id: svn://localhost/ardour2/branches/3.0@13266 d708f5d6-7413-0410-9779-e7cbd77b26cf
This commit is contained in:
Robin Gareus 2012-10-13 23:27:40 +00:00
parent 13d23f15aa
commit 4a17dd8fb6
3 changed files with 293 additions and 182 deletions
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200
libs/ardour/session_time.cc
View file

@ -100,194 +100,30 @@ Session::sync_time_vars ()
void
Session::timecode_to_sample( Timecode::Time& timecode, framepos_t& sample, bool use_offset, bool use_subframes ) const
{
double my_frames_per_timecode_frame = _frames_per_timecode_frame;
if (timecode.rate > 0) {
my_frames_per_timecode_frame = (double) _current_frame_rate / (double) timecode.rate;
}
timecode.rate = timecode_frames_per_second();
if (timecode.drop) {
// The drop frame format was created to better approximate the 30000/1001 = 29.97002997002997....
// framerate of NTSC color TV. The used frame rate of drop frame is 29.97, which drifts by about
// 0.108 frame per hour, or about 1.3 frames per 12 hours. This is not perfect, but a lot better
// than using 30 non drop, which will drift with about 1.8 frame per minute.
// Using 29.97, drop frame real time can be accurate only every 10th minute (10 minutes of 29.97 fps
// is exactly 17982 frames). One minute is 1798.2 frames, but we count 30 frames per second
// (30 * 60 = 1800). This means that at the first minute boundary (at the end of 0:0:59:29) we
// are 1.8 frames too late relative to real time. By dropping 2 frames (jumping to 0:1:0:2) we are
// approx. 0.2 frames too early. This adds up with 0.2 too early for each minute until we are 1.8
// frames too early at 0:9:0:2 (9 * 0.2 = 1.8). The 10th minute brings us 1.8 frames later again
// (at end of 0:9:59:29), which sums up to 0 (we are back to zero at 0:10:0:0 :-).
//
// In table form:
//
// Timecode value frames offset subframes offset seconds (rounded) 44100 sample (rounded)
// 0:00:00:00 0.0 0 0.000 0 (accurate)
// 0:00:59:29 1.8 144 60.027 2647177
// 0:01:00:02 -0.2 -16 60.060 2648648
// 0:01:59:29 1.6 128 120.020 5292883
// 0:02:00:02 -0.4 -32 120.053 5294354
// 0:02:59:29 1.4 112 180.013 7938588
// 0:03:00:02 -0.6 -48 180.047 7940060
// 0:03:59:29 1.2 96 240.007 10584294
// 0:04:00:02 -0.8 -64 240.040 10585766
// 0:04:59:29 1.0 80 300.000 13230000
// 0:05:00:02 -1.0 -80 300.033 13231471
// 0:05:59:29 0.8 64 359.993 15875706
// 0:06:00:02 -1.2 -96 360.027 15877177
// 0:06:59:29 0.6 48 419.987 18521411
// 0:07:00:02 -1.4 -112 420.020 18522883
// 0:07:59:29 0.4 32 478.980 21167117
// 0:08:00:02 -1.6 -128 480.013 21168589
// 0:08:59:29 0.2 16 539.973 23812823
// 0:09:00:02 -1.8 -144 540.007 23814294
// 0:09:59:29 0.0+ 0+ 599.967 26458529
// 0:10:00:00 0.0 0 600.000 26460000 (accurate)
//
// Per Sigmond <per@sigmond.no>
// Samples inside time dividable by 10 minutes (real time accurate)
framecnt_t base_samples = (framecnt_t) (((timecode.hours * 107892) + ((timecode.minutes / 10) * 17982)) * my_frames_per_timecode_frame);
// Samples inside time exceeding the nearest 10 minutes (always offset, see above)
int32_t exceeding_df_minutes = timecode.minutes % 10;
int32_t exceeding_df_seconds = (exceeding_df_minutes * 60) + timecode.seconds;
int32_t exceeding_df_frames = (30 * exceeding_df_seconds) + timecode.frames - (2 * exceeding_df_minutes);
framecnt_t exceeding_samples = (framecnt_t) rint(exceeding_df_frames * my_frames_per_timecode_frame);
sample = base_samples + exceeding_samples;
} else {
/*
Non drop is easy.. just note the use of
rint(timecode.rate) * _frames_per_timecode_frame
(frames per Timecode second), which is larger than
frame_rate() in the non-integer Timecode rate case.
*/
sample = (framecnt_t)rint((((timecode.hours * 60 * 60) + (timecode.minutes * 60) + timecode.seconds) * (rint(timecode.rate) * my_frames_per_timecode_frame)) + (timecode.frames * my_frames_per_timecode_frame));
}
if (use_subframes) {
sample += (int32_t) (((double)timecode.subframes * my_frames_per_timecode_frame) / config.get_subframes_per_frame());
}
if (use_offset) {
if (config.get_timecode_offset_negative()) {
if (sample >= config.get_timecode_offset()) {
sample -= config.get_timecode_offset();
} else {
/* Prevent song-time from becoming negative */
sample = 0;
}
} else {
if (timecode.negative) {
if (sample <= config.get_timecode_offset()) {
sample = config.get_timecode_offset() - sample;
} else {
sample = 0;
}
} else {
sample += config.get_timecode_offset();
}
}
}
Timecode::timecode_to_sample(
timecode, sample, use_offset, use_subframes,
_current_frame_rate,
config.get_subframes_per_frame(),
config.get_timecode_offset_negative(), config.get_timecode_offset()
);
}
void
Session::sample_to_timecode (framepos_t sample, Timecode::Time& timecode, bool use_offset, bool use_subframes ) const
{
framepos_t offset_sample;
Timecode::sample_to_timecode (
sample, timecode, use_offset, use_subframes,
if (!use_offset) {
offset_sample = sample;
timecode.negative = false;
} else {
if (config.get_timecode_offset_negative()) {
offset_sample = sample + config.get_timecode_offset ();
timecode.negative = false;
} else {
if (sample < config.get_timecode_offset()) {
offset_sample = (config.get_timecode_offset() - sample);
timecode.negative = true;
} else {
offset_sample = sample - config.get_timecode_offset();
timecode.negative = false;
}
}
}
timecode_frames_per_second(),
timecode_drop_frames(),
double(_current_frame_rate),
double timecode_frames_left_exact;
double timecode_frames_fraction;
uint32_t timecode_frames_left;
// Extract whole hours. Do this to prevent rounding errors with
// high sample numbers in the calculations that follow.
timecode.hours = offset_sample / _frames_per_hour;
offset_sample = offset_sample % _frames_per_hour;
// Calculate exact number of (exceeding) timecode frames and fractional frames
timecode_frames_left_exact = (double) offset_sample / _frames_per_timecode_frame;
timecode_frames_fraction = timecode_frames_left_exact - floor( timecode_frames_left_exact );
timecode.subframes = (int32_t) rint(timecode_frames_fraction * config.get_subframes_per_frame());
// XXX Not sure if this is necessary anymore...
if (timecode.subframes == config.get_subframes_per_frame()) {
// This can happen with 24 fps (and 29.97 fps ?)
timecode_frames_left_exact = ceil( timecode_frames_left_exact );
timecode.subframes = 0;
}
// Extract hour-exceeding frames for minute, second and frame calculations
timecode_frames_left = (uint32_t) floor (timecode_frames_left_exact);
if (timecode_drop_frames()) {
// See int32_t explanation in timecode_to_sample()...
// Number of 10 minute chunks
timecode.minutes = (timecode_frames_left / 17982) * 10; // exactly 17982 frames in 10 minutes
// frames exceeding the nearest 10 minute barrier
int32_t exceeding_df_frames = timecode_frames_left % 17982;
// Find minutes exceeding the nearest 10 minute barrier
if (exceeding_df_frames >= 1800) { // nothing to do if we are inside the first minute (0-1799)
exceeding_df_frames -= 1800; // take away first minute (different number of frames than the others)
int32_t extra_minutes_minus_1 = exceeding_df_frames / 1798; // how many minutes after the first one
exceeding_df_frames -= extra_minutes_minus_1 * 1798; // take away the (extra) minutes just found
timecode.minutes += extra_minutes_minus_1 + 1; // update with exceeding minutes
}
// Adjust frame numbering for dropped frames (frame 0 and 1 skipped at start of every minute except every 10th)
if (timecode.minutes % 10) {
// Every minute except every 10th
if (exceeding_df_frames < 28) {
// First second, frames 0 and 1 are skipped
timecode.seconds = 0;
timecode.frames = exceeding_df_frames + 2;
} else {
// All other seconds, all 30 frames are counted
exceeding_df_frames -= 28;
timecode.seconds = (exceeding_df_frames / 30) + 1;
timecode.frames = exceeding_df_frames % 30;
}
} else {
// Every 10th minute, all 30 frames counted in all seconds
timecode.seconds = exceeding_df_frames / 30;
timecode.frames = exceeding_df_frames % 30;
}
} else {
// Non drop is easy
timecode.minutes = timecode_frames_left / ((int32_t) rint (timecode_frames_per_second ()) * 60);
timecode_frames_left = timecode_frames_left % ((int32_t) rint (timecode_frames_per_second ()) * 60);
timecode.seconds = timecode_frames_left / (int32_t) rint(timecode_frames_per_second ());
timecode.frames = timecode_frames_left % (int32_t) rint(timecode_frames_per_second ());
}
if (!use_subframes) {
timecode.subframes = 0;
}
/* set frame rate and drop frame */
timecode.rate = timecode_frames_per_second ();
timecode.drop = timecode_drop_frames();
config.get_subframes_per_frame(),
config.get_timecode_offset_negative(), config.get_timecode_offset()
);
}
void
@ -298,7 +134,7 @@ Session::timecode_time (framepos_t when, Timecode::Time& timecode)
return;
}
sample_to_timecode( when, timecode, true /* use_offset */, false /* use_subframes */ );
this->sample_to_timecode( when, timecode, true /* use_offset */, false /* use_subframes */ );
last_timecode_when = when;
last_timecode = timecode;
@ -313,7 +149,7 @@ Session::timecode_time_subframes (framepos_t when, Timecode::Time& timecode)
return;
}
sample_to_timecode( when, timecode, true /* use_offset */, true /* use_subframes */ );
this->sample_to_timecode( when, timecode, true /* use_offset */, true /* use_subframes */ );
last_timecode_when = when;
last_timecode = timecode;
@ -323,7 +159,7 @@ Session::timecode_time_subframes (framepos_t when, Timecode::Time& timecode)
void
Session::timecode_duration (framecnt_t when, Timecode::Time& timecode) const
{
sample_to_timecode( when, timecode, false /* use_offset */, true /* use_subframes */ );
this->sample_to_timecode( when, timecode, false /* use_offset */, true /* use_subframes */ );
}
void

243
libs/timecode/src/time.cc
View file

@ -20,6 +20,7 @@
#define Timecode_IS_ZERO(sm) (!(sm).frames && !(sm).seconds && !(sm).minutes && !(sm).hours && !(sm.subframes))
#include <math.h>
#include <stdio.h>
#include "timecode/time.h"
@ -577,6 +578,248 @@ timecode_format_name (TimecodeFormat const t)
return "??";
}
std::string timecode_format_time (Timecode::Time& TC)
{
char buf[32];
if (TC.negative) {
snprintf (buf, sizeof (buf), "-%02" PRIu32 ":%02" PRIu32 ":%02" PRIu32 ":%02" PRIu32, TC.hours, TC.minutes, TC.seconds, TC.frames);
} else {
snprintf (buf, sizeof (buf), " %02" PRIu32 ":%02" PRIu32 ":%02" PRIu32 ":%02" PRIu32, TC.hours, TC.minutes, TC.seconds, TC.frames);
}
return std::string(buf);
}
std::string timecode_format_sampletime (
int64_t sample,
double sample_frame_rate,
double timecode_frames_per_second, bool timecode_drop_frames)
{
Time t;
sample_to_timecode(
sample, t, false, false,
timecode_frames_per_second, timecode_drop_frames,
sample_frame_rate,
80, false, 0);
return timecode_format_time(t);
}
void
timecode_to_sample(
Timecode::Time& timecode, int64_t& sample,
bool use_offset, bool use_subframes,
/* Note - framerate info is taken from Timecode::Time& */
double sample_frame_rate /**< may include pull up/down */,
int32_t subframes_per_frame,
/* optional offset - can be improved: function pointer to lazily query this*/
bool offset_is_negative, int64_t offset_samples
)
{
const double frames_per_timecode_frame = (double) sample_frame_rate / (double) timecode.rate;
if (timecode.drop) {
// The drop frame format was created to better approximate the 30000/1001 = 29.97002997002997....
// framerate of NTSC color TV. The used frame rate of drop frame is 29.97, which drifts by about
// 0.108 frame per hour, or about 1.3 frames per 12 hours. This is not perfect, but a lot better
// than using 30 non drop, which will drift with about 1.8 frame per minute.
// Using 29.97, drop frame real time can be accurate only every 10th minute (10 minutes of 29.97 fps
// is exactly 17982 frames). One minute is 1798.2 frames, but we count 30 frames per second
// (30 * 60 = 1800). This means that at the first minute boundary (at the end of 0:0:59:29) we
// are 1.8 frames too late relative to real time. By dropping 2 frames (jumping to 0:1:0:2) we are
// approx. 0.2 frames too early. This adds up with 0.2 too early for each minute until we are 1.8
// frames too early at 0:9:0:2 (9 * 0.2 = 1.8). The 10th minute brings us 1.8 frames later again
// (at end of 0:9:59:29), which sums up to 0 (we are back to zero at 0:10:0:0 :-).
//
// In table form:
//
// Timecode value frames offset subframes offset seconds (rounded) 44100 sample (rounded)
// 0:00:00:00 0.0 0 0.000 0 (accurate)
// 0:00:59:29 1.8 144 60.027 2647177
// 0:01:00:02 -0.2 -16 60.060 2648648
// 0:01:59:29 1.6 128 120.020 5292883
// 0:02:00:02 -0.4 -32 120.053 5294354
// 0:02:59:29 1.4 112 180.013 7938588
// 0:03:00:02 -0.6 -48 180.047 7940060
// 0:03:59:29 1.2 96 240.007 10584294
// 0:04:00:02 -0.8 -64 240.040 10585766
// 0:04:59:29 1.0 80 300.000 13230000
// 0:05:00:02 -1.0 -80 300.033 13231471
// 0:05:59:29 0.8 64 359.993 15875706
// 0:06:00:02 -1.2 -96 360.027 15877177
// 0:06:59:29 0.6 48 419.987 18521411
// 0:07:00:02 -1.4 -112 420.020 18522883
// 0:07:59:29 0.4 32 478.980 21167117
// 0:08:00:02 -1.6 -128 480.013 21168589
// 0:08:59:29 0.2 16 539.973 23812823
// 0:09:00:02 -1.8 -144 540.007 23814294
// 0:09:59:29 0.0+ 0+ 599.967 26458529
// 0:10:00:00 0.0 0 600.000 26460000 (accurate)
//
// Per Sigmond <per@sigmond.no>
// Samples inside time dividable by 10 minutes (real time accurate)
int64_t base_samples = (int64_t) (((timecode.hours * 107892) + ((timecode.minutes / 10) * 17982)) * frames_per_timecode_frame);
// Samples inside time exceeding the nearest 10 minutes (always offset, see above)
int32_t exceeding_df_minutes = timecode.minutes % 10;
int32_t exceeding_df_seconds = (exceeding_df_minutes * 60) + timecode.seconds;
int32_t exceeding_df_frames = (30 * exceeding_df_seconds) + timecode.frames - (2 * exceeding_df_minutes);
int64_t exceeding_samples = (int64_t) rint(exceeding_df_frames * frames_per_timecode_frame);
sample = base_samples + exceeding_samples;
} else {
/*
Non drop is easy.. just note the use of
rint(timecode.rate) * frames_per_timecode_frame
(frames per Timecode second), which is larger than
frame_rate() in the non-integer Timecode rate case.
*/
sample = (int64_t)rint((((timecode.hours * 60 * 60) + (timecode.minutes * 60) + timecode.seconds) * (rint(timecode.rate) * frames_per_timecode_frame)) + (timecode.frames * frames_per_timecode_frame));
}
if (use_subframes) {
sample += (int64_t) (((double)timecode.subframes * frames_per_timecode_frame) / subframes_per_frame);
}
if (use_offset) {
if (offset_is_negative) {
if (sample >= offset_samples) {
sample -= offset_samples;
} else {
/* Prevent song-time from becoming negative */
sample = 0;
}
} else {
if (timecode.negative) {
if (sample <= offset_samples) {
sample = offset_samples - sample;
} else {
sample = 0;
}
} else {
sample += offset_samples;
}
}
}
}
void
sample_to_timecode (
int64_t sample, Timecode::Time& timecode,
bool use_offset, bool use_subframes,
/* framerate info */
double timecode_frames_per_second,
bool timecode_drop_frames,
double sample_frame_rate/**< can include pull up/down */,
int32_t subframes_per_frame,
/* optional offset - can be improved: function pointer to lazily query this*/
bool offset_is_negative, int64_t offset_samples
)
{
const double frames_per_timecode_frame = (double) sample_frame_rate / (double) timecode_frames_per_second;
int32_t frames_per_hour;
if (timecode_drop_frames) {
frames_per_hour = (int32_t)(107892 * frames_per_timecode_frame);
} else {
frames_per_hour = (int32_t)(3600 * rint(timecode_frames_per_second) * frames_per_timecode_frame);
}
/* do the work */
int64_t offset_sample;
if (!use_offset) {
offset_sample = sample;
timecode.negative = false;
} else {
if (offset_is_negative) {
offset_sample = sample + offset_samples;
timecode.negative = false;
} else {
if (sample < offset_samples) {
offset_sample = (offset_samples - sample);
timecode.negative = true;
} else {
offset_sample = sample - offset_samples;
timecode.negative = false;
}
}
}
double timecode_frames_left_exact;
double timecode_frames_fraction;
uint64_t timecode_frames_left;
// Extract whole hours. Do this to prevent rounding errors with
// high sample numbers in the calculations that follow.
timecode.hours = offset_sample / frames_per_hour;
offset_sample = offset_sample % frames_per_hour;
// Calculate exact number of (exceeding) timecode frames and fractional frames
timecode_frames_left_exact = (double) offset_sample / frames_per_timecode_frame;
timecode_frames_fraction = timecode_frames_left_exact - floor( timecode_frames_left_exact );
timecode.subframes = (int32_t) floor(timecode_frames_fraction * subframes_per_frame);
// XXX Not sure if this is necessary anymore...
if (timecode.subframes == subframes_per_frame) {
// This can happen with 24 fps (and 29.97 fps ?)
timecode_frames_left_exact = ceil( timecode_frames_left_exact );
timecode.subframes = 0;
}
// Extract hour-exceeding frames for minute, second and frame calculations
timecode_frames_left = (uint64_t) floor (timecode_frames_left_exact);
if (timecode_drop_frames) {
// See int32_t explanation in timecode_to_sample()...
// Number of 10 minute chunks
timecode.minutes = (timecode_frames_left / 17982) * 10; // exactly 17982 frames in 10 minutes
// frames exceeding the nearest 10 minute barrier
int32_t exceeding_df_frames = timecode_frames_left % 17982;
// Find minutes exceeding the nearest 10 minute barrier
if (exceeding_df_frames >= 1800) { // nothing to do if we are inside the first minute (0-1799)
exceeding_df_frames -= 1800; // take away first minute (different number of frames than the others)
int32_t extra_minutes_minus_1 = exceeding_df_frames / 1798; // how many minutes after the first one
exceeding_df_frames -= extra_minutes_minus_1 * 1798; // take away the (extra) minutes just found
timecode.minutes += extra_minutes_minus_1 + 1; // update with exceeding minutes
}
// Adjust frame numbering for dropped frames (frame 0 and 1 skipped at start of every minute except every 10th)
if (timecode.minutes % 10) {
// Every minute except every 10th
if (exceeding_df_frames < 28) {
// First second, frames 0 and 1 are skipped
timecode.seconds = 0;
timecode.frames = exceeding_df_frames + 2;
} else {
// All other seconds, all 30 frames are counted
exceeding_df_frames -= 28;
timecode.seconds = (exceeding_df_frames / 30) + 1;
timecode.frames = exceeding_df_frames % 30;
}
} else {
// Every 10th minute, all 30 frames counted in all seconds
timecode.seconds = exceeding_df_frames / 30;
timecode.frames = exceeding_df_frames % 30;
}
} else {
// Non drop is easy
timecode.minutes = timecode_frames_left / ((int32_t) rint (timecode_frames_per_second) * 60);
timecode_frames_left = timecode_frames_left % ((int32_t) rint (timecode_frames_per_second) * 60);
timecode.seconds = timecode_frames_left / (int32_t) rint(timecode_frames_per_second);
timecode.frames = timecode_frames_left % (int32_t) rint(timecode_frames_per_second);
}
if (!use_subframes) {
timecode.subframes = 0;
}
/* set frame rate and drop frame */
timecode.rate = timecode_frames_per_second;
timecode.drop = timecode_drop_frames;
}
} // namespace Timecode
std::ostream&

32
libs/timecode/timecode/time.h
View file

@ -102,6 +102,38 @@ bool timecode_has_drop_frames(TimecodeFormat const t);
std::string timecode_format_name (TimecodeFormat const t);
std::string timecode_format_time (Timecode::Time& timecode);
std::string timecode_format_sampletime (
int64_t sample,
double sample_frame_rate,
double timecode_frames_per_second, bool timecode_drop_frames
);
void
timecode_to_sample(
Timecode::Time& timecode, int64_t& sample,
bool use_offset, bool use_subframes,
/* Note - framerate info is taken from Timecode::Time& */
double sample_frame_rate /**< may include pull up/down */,
int32_t subframes_per_frame /**< must not be 0 if use_subframes==true */,
/* optional offset - can be improved: function pointer to lazily query this*/
bool offset_is_negative, int64_t offset_samples
);
void sample_to_timecode (
int64_t sample, Timecode::Time& timecode,
bool use_offset, bool use_subframes,
/* framerate info */
double timecode_frames_per_second,
bool timecode_drop_frames,
double sample_frame_rate/**< can include pull up/down */,
int32_t subframes_per_frame,
/* optional offset - can be improved: function pointer to lazily query this*/
bool offset_is_negative, int64_t offset_samples
);
} // namespace Timecode
std::ostream& operator<< (std::ostream& ostr, const Timecode::Time& t);