double Time::default_rate = 30.0;
-/** Increment @a timecode by exactly one frame (keep subframes value).
+/** Increment @a timecode by exactly one sample (keep subframes value).
* Realtime safe.
* @return true if seconds wrap.
*/
}
-/** Decrement @a timecode by exactly one frame (keep subframes value)
+/** Decrement @a timecode by exactly one sample (keep subframes value)
* Realtime safe.
* @return true if seconds wrap. */
Wrap
}
-/** Go to lowest absolute subframe value in this frame (set to 0 :-)) */
+/** Go to lowest absolute subframe value in this sample (set to 0 :-)) */
void
-frames_floor (Time& timecode)
+frames_floot (Time& timecode)
{
timecode.subframes = 0;
if (Timecode_IS_ZERO (timecode)) {
}
-/** Go to next whole second (frames == 0 or frames == 2) */
+/** Go to next whole second (samples == 0 or samples == 2) */
Wrap
increment_seconds (Time& timecode, uint32_t subframes_per_frame)
{
Wrap wrap = NONE;
// Clear subframes
- frames_floor (timecode);
+ frames_floot (timecode);
if (timecode.negative) {
// Wrap second if on second boundary
wrap = increment (timecode, subframes_per_frame);
- // Go to lowest absolute frame value
+ // Go to lowest absolute sample value
seconds_floor (timecode);
if (Timecode_IS_ZERO (timecode)) {
timecode.negative = false;
}
} else {
- // Go to highest possible frame in this second
+ // Go to highest possible sample in this second
switch ((int)ceil (timecode.rate)) {
case 24:
timecode.frames = 23;
break;
}
- // Increment by one frame
+ // Increment by one sample
wrap = increment (timecode, subframes_per_frame);
}
}
-/** Go to lowest (absolute) frame value in this second
+/** Go to lowest (absolute) sample value in this second
* Doesn't care about positive/negative */
void
seconds_floor (Time& timecode)
{
// Clear subframes
- frames_floor (timecode);
+ frames_floot (timecode);
- // Go to lowest possible frame in this second
+ // Go to lowest possible sample in this second
switch ((int)ceil (timecode.rate)) {
case 24:
case 25:
}
-/** Go to next whole minute (seconds == 0, frames == 0 or frames == 2) */
+/** Go to next whole minute (seconds == 0, samples == 0 or samples == 2) */
Wrap
increment_minutes (Time& timecode, uint32_t subframes_per_frame)
{
Wrap wrap = NONE;
// Clear subframes
- frames_floor (timecode);
+ frames_floot (timecode);
if (timecode.negative) {
// Wrap if on minute boundary
{
// Go to lowest possible second
timecode.seconds = 0;
- // Go to lowest possible frame
+ // Go to lowest possible sample
seconds_floor (timecode);
if (Timecode_IS_ZERO (timecode)) {
}
-/** Go to next whole hour (minute = 0, second = 0, frame = 0) */
+/** Go to next whole hour (minute = 0, second = 0, sample = 0) */
Wrap
increment_hours (Time& timecode, uint32_t subframes_per_frame)
{
Wrap wrap = NONE;
// Clear subframes
- frames_floor (timecode);
+ frames_floot (timecode);
if (timecode.negative) {
// Wrap if on hour boundary
std::string timecode_format_sampletime (
int64_t sample,
- double sample_frame_rate,
+ double sample_sample_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,
+ sample_sample_rate,
80, false, 0);
return timecode_format_time(t);
}
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 */,
+ double sample_sample_rate /**< may include pull up/down */,
uint32_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 samples_per_timecode_frame = (double) sample_frame_rate / (double) timecode.rate;
+ const double samples_per_timecode_frame = (double) sample_sample_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
+ // The drop sample format was created to better approximate the 30000/1001 = 29.97002997002997....
+ // framerate of NTSC color TV. The used frame rate of drop sample is 29.97, which drifts by about
+ // 0.108 sample per hour, or about 1.3 samples per 12 hours. This is not perfect, but a lot better
+ // than using 30 non drop, which will drift with about 1.8 sample per minute.
+ // Using 29.97, drop sample real time can be accurate only every 10th minute (10 minutes of 29.97 fps
+ // is exactly 17982 samples). One minute is 1798.2 samples, but we count 30 samples 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
+ // are 1.8 samples too late relative to real time. By dropping 2 samples (jumping to 0:1:0:2) we are
+ // approx. 0.2 samples too early. This adds up with 0.2 too early for each minute until we are 1.8
+ // samples too early at 0:9:0:2 (9 * 0.2 = 1.8). The 10th minute brings us 1.8 samples 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)
+ // Timecode value samples 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
+ fps_i * 60 * timecode.minutes
+ fps_i * timecode.seconds + timecode.frames
- 2 * (totalMinutes - totalMinutes / 10);
- sample = frameNumber * sample_frame_rate / (double) timecode.rate;
+ sample = frameNumber * sample_sample_rate / (double) timecode.rate;
} else {
/*
Non drop is easy.. just note the use of
rint(timecode.rate) * samples_per_timecode_frame
- (frames per Timecode second), which is larger than
- frame_rate() in the non-integer Timecode rate case.
+ (samples per Timecode second), which is larger than
+ sample_rate() in the non-integer Timecode rate case.
*/
sample = (int64_t) rint(
/* framerate info */
double timecode_frames_per_second,
bool timecode_drop_frames,
- double sample_frame_rate/**< can include pull up/down */,
+ double sample_sample_rate/**< can include pull up/down */,
uint32_t subframes_per_frame,
/* optional offset - can be improved: function pointer to lazily query this*/
bool offset_is_negative, int64_t offset_samples
}
if (timecode_drop_frames) {
- int64_t frameNumber = floor( (double)offset_sample * timecode_frames_per_second / sample_frame_rate);
+ int64_t frameNumber = floor( (double)offset_sample * timecode_frames_per_second / sample_sample_rate);
- /* there are 17982 frames in 10 min @ 29.97df */
+ /* there are 17982 samples in 10 min @ 29.97df */
const int64_t D = frameNumber / 17982;
const int64_t M = frameNumber % 17982;
timecode.subframes = rint(subframes_per_frame
- * ((double)offset_sample * timecode_frames_per_second / sample_frame_rate - (double)frameNumber));
+ * ((double)offset_sample * timecode_frames_per_second / sample_sample_rate - (double)frameNumber));
if (timecode.subframes == subframes_per_frame) {
timecode.subframes = 0;
double timecode_frames_left_exact;
double timecode_frames_fraction;
int64_t timecode_frames_left;
- const double samples_per_timecode_frame = sample_frame_rate / timecode_frames_per_second;
+ const double samples_per_timecode_frame = sample_sample_rate / timecode_frames_per_second;
const int64_t frames_per_hour = (int64_t)(3600. * rint(timecode_frames_per_second) * samples_per_timecode_frame);
timecode.hours = offset_sample / frames_per_hour;
if (!use_subframes) {
timecode.subframes = 0;
}
- /* set frame rate and drop frame */
+ /* set frame rate and drop sample */
timecode.rate = timecode_frames_per_second;
timecode.drop = timecode_drop_frames;
}
projects / ardour.git / blobdiff