*/
+/** @file src/audio_merger.cc
+ * @brief AudioMerger class.
+ */
+
#include "audio_merger.h"
#include "dcpomatic_time.h"
#include <iostream>
using std::make_pair;
using boost::shared_ptr;
using boost::optional;
+using namespace dcpomatic;
AudioMerger::AudioMerger (int frame_rate)
- : _last_pull (0)
- , _frame_rate (frame_rate)
+ : _frame_rate (frame_rate)
{
}
+Frame
+AudioMerger::frames (DCPTime t) const
+{
+ return t.frames_floor (_frame_rate);
+}
+
/** Pull audio up to a given time; after this call, no more data can be pushed
* before the specified time.
+ * @param time Time to pull up to.
+ * @return Blocks of merged audio up to `time'.
*/
list<pair<shared_ptr<AudioBuffers>, DCPTime> >
AudioMerger::pull (DCPTime time)
{
list<pair<shared_ptr<AudioBuffers>, DCPTime> > out;
- DCPTimePeriod period (_last_pull, time);
- _buffers.sort (AudioMerger::BufferComparator());
-
list<Buffer> new_buffers;
+ _buffers.sort (AudioMerger::BufferComparator());
BOOST_FOREACH (Buffer i, _buffers) {
if (i.period().to <= time) {
/* Completely within the pull period */
+ DCPOMATIC_ASSERT (i.audio->frames() > 0);
out.push_back (make_pair (i.audio, i.time));
} else if (i.time < time) {
/* Overlaps the end of the pull period */
- shared_ptr<AudioBuffers> audio (new AudioBuffers (i.audio->channels(), DCPTime(time - i.time).frames_floor(_frame_rate)));
- audio->copy_from (i.audio.get(), audio->frames(), 0, 0);
- out.push_back (make_pair (audio, i.time));
- i.audio->trim_start (audio->frames ());
- i.time += DCPTime::from_frames(audio->frames(), _frame_rate);
- new_buffers.push_back (i);
+ shared_ptr<AudioBuffers> audio (new AudioBuffers (i.audio->channels(), frames(DCPTime(time - i.time))));
+ /* Though time > i.time, audio->frames() could be 0 if the difference in time is less than one frame */
+ if (audio->frames() > 0) {
+ audio->copy_from (i.audio.get(), audio->frames(), 0, 0);
+ out.push_back (make_pair (audio, i.time));
+ i.audio->trim_start (audio->frames ());
+ i.time += DCPTime::from_frames(audio->frames(), _frame_rate);
+ DCPOMATIC_ASSERT (i.audio->frames() > 0);
+ new_buffers.push_back (i);
+ }
} else {
/* Not involved */
+ DCPOMATIC_ASSERT (i.audio->frames() > 0);
new_buffers.push_back (i);
}
}
_buffers = new_buffers;
+
+ for (list<pair<shared_ptr<AudioBuffers>, DCPTime> >::const_iterator i = out.begin(); i != out.end(); ++i) {
+ DCPOMATIC_ASSERT (i->first->frames() > 0);
+ }
+
return out;
}
+/** Push some data into the merger at a given time */
void
AudioMerger::push (boost::shared_ptr<const AudioBuffers> audio, DCPTime time)
{
- DCPOMATIC_ASSERT (time >= _last_pull);
+ DCPOMATIC_ASSERT (audio->frames() > 0);
DCPTimePeriod period (time, time + DCPTime::from_frames (audio->frames(), _frame_rate));
- /* Mix any parts of this new block with existing ones */
+ /* Mix any overlapping parts of this new block with existing ones */
BOOST_FOREACH (Buffer i, _buffers) {
optional<DCPTimePeriod> overlap = i.period().overlap (period);
if (overlap) {
- int32_t const offset = DCPTime(overlap->from - i.time).frames_floor(_frame_rate);
- int32_t const frames = overlap->duration().frames_floor(_frame_rate);
+ int32_t const offset = frames(DCPTime(overlap->from - i.time));
+ int32_t const frames_to_mix = frames(overlap->duration());
if (i.time < time) {
- i.audio->accumulate_frames(audio.get(), frames, 0, offset);
+ i.audio->accumulate_frames(audio.get(), frames_to_mix, 0, offset);
} else {
- i.audio->accumulate_frames(audio.get(), frames, offset, 0);
+ i.audio->accumulate_frames(audio.get(), frames_to_mix, offset, 0);
}
}
}
}
/* Get the part of audio that we want to use */
- shared_ptr<AudioBuffers> part (new AudioBuffers (audio->channels(), i.to.frames_floor(_frame_rate) - i.from.frames_floor(_frame_rate)));
- part->copy_from (audio.get(), part->frames(), DCPTime(i.from - time).frames_floor(_frame_rate), 0);
+ shared_ptr<AudioBuffers> part (new AudioBuffers (audio->channels(), frames(i.to) - frames(i.from)));
+ part->copy_from (audio.get(), part->frames(), frames(DCPTime(i.from - time)), 0);
if (before == _buffers.end() && after == _buffers.end()) {
/* New buffer */
+ DCPOMATIC_ASSERT (part->frames() > 0);
_buffers.push_back (Buffer (part, time, _frame_rate));
} else if (before != _buffers.end() && after == _buffers.end()) {
/* We have an existing buffer before this one; append new data to it */
}
}
}
+
+void
+AudioMerger::clear ()
+{
+ _buffers.clear ();
+}