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Implements PCMTrack::add_segment. Thereby completes PCMTrack::resampled_clone.
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@ -120,3 +120,7 @@ Storage::Time PCMSegmentEventSource::seek_to(const Time &time_from_start) {
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const PCMSegment &PCMSegmentEventSource::segment() const {
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return *segment_;
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}
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PCMSegment &PCMSegmentEventSource::segment() {
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return *segment_;
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}
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@ -179,6 +179,7 @@ class PCMSegmentEventSource {
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@returns a reference to the underlying segment.
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*/
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const PCMSegment &segment() const;
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PCMSegment &segment();
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private:
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std::shared_ptr<PCMSegment> segment_;
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@ -50,7 +50,7 @@ PCMTrack::PCMTrack(unsigned int bits_per_track) : PCMTrack() {
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PCMSegment segment;
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segment.length_of_a_bit.length = 1;
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segment.length_of_a_bit.clock_rate = bits_per_track;
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segment.data.resize((bits_per_track + 7) >> 3);
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segment.data.resize(bits_per_track);
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segment_event_sources_.emplace_back(segment);
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}
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@ -59,10 +59,12 @@ Track *PCMTrack::clone() const {
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}
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Track *PCMTrack::resampled_clone(size_t bits_per_track) {
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PCMTrack *new_track = new PCMTrack(static_cast<unsigned int>(bits_per_track));
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// Create an empty track.
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PCMTrack *const new_track = new PCMTrack(static_cast<unsigned int>(bits_per_track));
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// Plot all segments from this track onto the destination.
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Time start_time;
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for(const auto &event_source : segment_event_sources_) {
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for(const auto &event_source: segment_event_sources_) {
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const PCMSegment &source = event_source.segment();
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new_track->add_segment(start_time, source, true);
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start_time += source.length();
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@ -131,11 +133,24 @@ Storage::Time PCMTrack::seek_to(const Time &time_since_index_hole) {
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}
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void PCMTrack::add_segment(const Time &start_time, const PCMSegment &segment, bool clamp_to_index_hole) {
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// Write half a bit of silence to lead up to the first possible flux point.
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// Get a reference to the destination.
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PCMSegment &destination = segment_event_sources_.front().segment();
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// Write out the bits contained in this segment.
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// Determine the range to fill on the target segment.
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const Time end_time = start_time + segment.length();
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const size_t start_bit = start_time.length * destination.data.size() / start_time.clock_rate;
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const size_t end_bit = end_time.length * destination.data.size() / end_time.clock_rate;
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// Write half a bit of silence to end the segment.
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// Reset the destination.
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std::fill(destination.data.begin() + static_cast<off_t>(start_bit), destination.data.begin() + static_cast<off_t>(end_bit), false);
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unsigned int position = start_time.length;
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// Step through the source data, and for each true map to a location in the destination and set it.
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const size_t target_width = end_bit - start_bit;
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const size_t half_offset = target_width / (2 * segment.data.size());
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for(size_t bit = 0; bit < segment.data.size(); ++bit) {
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if(segment.data[bit]) {
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const size_t output_bit = start_bit + half_offset + (bit * target_width) / segment.data.size();
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destination.data[output_bit] = true;
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}
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}
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}
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