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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "ring_buffer.h"
#include <algorithm>
#include "integral_types.h"
namespace video_editing {
void RingBuffer::Init(int size, int num_channels, int num_readers) {
size_ = size;
num_channels_ = num_channels;
num_readers_ = num_readers;
temp_read_buffer_size_ = 1024;
initialized_ = true;
Reset();
}
RingBuffer::RingBuffer()
: initialized_(false), samples_(NULL),
num_readers_(0), temp_read_buffer_(NULL) {
}
RingBuffer::~RingBuffer() {
delete[] samples_;
delete[] temp_read_buffer_;
}
void RingBuffer::Reset() {
delete[] samples_;
samples_ = new float[size_ * num_channels_];
memset(samples_, 0,
size_ * num_channels_ * sizeof(samples_[0]));
temp_read_buffer_size_ = 1024;
delete[] temp_read_buffer_;
temp_read_buffer_ = new float[temp_read_buffer_size_ * num_channels_];
memset(temp_read_buffer_, 0,
temp_read_buffer_size_ * num_channels_ * sizeof(samples_[0]));
readers_.clear();
for (int i = 0; i < num_readers_; ++i) {
readers_.push_back(0LL);
}
head_logical_ = 0LL;
head_ = 0;
}
int RingBuffer::available(int reader) const {
return head_logical_ - readers_[reader];
}
int RingBuffer::overhead() const {
int64 tail = GetTail();
return tail + size_ - head_logical_;
}
int64 RingBuffer::GetTail() const {
return *std::min_element(readers_.begin(), readers_.end());
}
int64 RingBuffer::Tell(int reader) const {
return readers_[reader];
}
void RingBuffer::Seek(int reader, int64 position) {
readers_[reader] = position;
}
void RingBuffer::Write(const float* samples, int num_frames) {
if (!num_frames) {
return;
}
if (head_ + num_frames <= size_) {
memcpy(samples_ + head_ * num_channels_, samples,
num_frames * num_channels_ * sizeof(samples[0]));
head_ += num_frames;
} else {
int overhead = size_ - head_;
memcpy(samples_ + head_ * num_channels_, samples,
num_channels_ * overhead * sizeof(samples[0]));
head_ = num_frames - overhead;
memcpy(samples_, samples + overhead * num_channels_,
num_channels_ * head_ * sizeof(samples[0]));
}
head_logical_ += num_frames;
}
void RingBuffer::Copy(int reader, float* destination, int num_frames) const {
int pos = Tell(reader) % size_;
if (pos + num_frames <= size_) {
memcpy(destination, samples_ + pos * num_channels_,
num_channels_ * num_frames * sizeof(destination[0]));
} else {
int wrapped = size_ - pos;
memcpy(destination, samples_ + pos * num_channels_,
num_channels_ * wrapped * sizeof(destination[0]));
int remaining = num_frames - wrapped;
memcpy(destination + wrapped * num_channels_, samples_,
num_channels_ * remaining * sizeof(destination[0]));
}
}
float* RingBuffer::GetPointer(int reader, int num_frames) {
int pos = Tell(reader) % size_;
if (pos + num_frames <= size_) {
return samples_ + pos * num_channels_;
} else {
if (num_frames > temp_read_buffer_size_) {
temp_read_buffer_size_ = num_frames;
delete[] temp_read_buffer_;
temp_read_buffer_ =
new float[temp_read_buffer_size_ * num_channels_]; // NOLINT
}
Copy(reader, temp_read_buffer_, num_frames);
return temp_read_buffer_;
}
}
void RingBuffer::MergeBack(int reader, const float* source, int num_frames) {
// If the source pointer is not the temporary buffer,
// data updates were performed in place, so there is nothing to do.
// Otherwise, copy samples from the temp buffer back to the ring buffer.
if (source == temp_read_buffer_) {
int pos = Tell(reader) % size_;
if (pos + num_frames <= size_) {
memcpy(samples_ + (pos * num_channels_), source,
num_channels_ * num_frames * sizeof(source[0]));
} else {
int wrapped = size_ - pos;
memcpy(samples_ + (pos * num_channels_), source,
num_channels_ * wrapped * sizeof(source[0]));
int remaining = num_frames - wrapped;
memcpy(samples_, source + (wrapped * num_channels_),
num_channels_ * remaining * sizeof(source[0]));
}
}
}
} // namespace video_editing
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