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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/logging.h"
#include "base/stl_util.h"
#include "content/browser/speech/audio_buffer.h"
namespace speech {
AudioChunk::AudioChunk(int bytes_per_sample)
: bytes_per_sample_(bytes_per_sample) {
}
AudioChunk::AudioChunk(const uint8* data, size_t length, int bytes_per_sample)
: data_string_(reinterpret_cast<const char*>(data), length),
bytes_per_sample_(bytes_per_sample) {
DCHECK_EQ(length % bytes_per_sample, 0U);
}
bool AudioChunk::IsEmpty() const {
return data_string_.empty();
}
size_t AudioChunk::NumSamples() const {
return data_string_.size() / bytes_per_sample_;
}
const std::string& AudioChunk::AsString() const {
return data_string_;
}
int16 AudioChunk::GetSample16(size_t index) const {
DCHECK(index < (data_string_.size() / sizeof(int16)));
return SamplesData16()[index];
}
const int16* AudioChunk::SamplesData16() const {
return reinterpret_cast<const int16*>(data_string_.data());
}
AudioBuffer::AudioBuffer(int bytes_per_sample)
: bytes_per_sample_(bytes_per_sample) {
DCHECK(bytes_per_sample == 1 ||
bytes_per_sample == 2 ||
bytes_per_sample == 4);
}
AudioBuffer::~AudioBuffer() {
Clear();
}
void AudioBuffer::Enqueue(const uint8* data, size_t length) {
AudioChunk* chunk = new AudioChunk(data, length, bytes_per_sample_);
chunks_.push_back(chunk);
}
scoped_ptr<AudioChunk> AudioBuffer::DequeueSingleChunk() {
DCHECK(!chunks_.empty());
AudioChunk* chunk = *chunks_.begin();
chunks_.weak_erase(chunks_.begin());
return scoped_ptr<AudioChunk>(chunk);
}
scoped_ptr<AudioChunk> AudioBuffer::DequeueAll() {
AudioChunk* chunk = new AudioChunk(bytes_per_sample_);
size_t resulting_length = 0;
ChunksContainer::const_iterator it;
// In order to improve performance, calulate in advance the total length
// and then copy the chunks.
for (it = chunks_.begin(); it != chunks_.end(); ++it) {
resulting_length += (*it)->data_string_.length();
}
chunk->data_string_.reserve(resulting_length);
for (it = chunks_.begin(); it != chunks_.end(); ++it) {
chunk->data_string_.append((*it)->data_string_);
}
Clear();
return scoped_ptr<AudioChunk>(chunk);
}
void AudioBuffer::Clear() {
chunks_.erase(chunks_.begin(), chunks_.end());
}
bool AudioBuffer::IsEmpty() const {
return chunks_.empty();
}
} // namespace speech
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