15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2012 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "content/browser/speech/audio_buffer.h" 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/logging.h" 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/stl_util.h" 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace content { 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)AudioChunk::AudioChunk(int bytes_per_sample) 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : bytes_per_sample_(bytes_per_sample) { 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)AudioChunk::AudioChunk(const uint8* data, size_t length, int bytes_per_sample) 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : data_string_(reinterpret_cast<const char*>(data), length), 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bytes_per_sample_(bytes_per_sample) { 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_EQ(length % bytes_per_sample, 0U); 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool AudioChunk::IsEmpty() const { 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return data_string_.empty(); 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)size_t AudioChunk::NumSamples() const { 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return data_string_.size() / bytes_per_sample_; 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)const std::string& AudioChunk::AsString() const { 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return data_string_; 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)int16 AudioChunk::GetSample16(size_t index) const { 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(index < (data_string_.size() / sizeof(int16))); 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return SamplesData16()[index]; 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)const int16* AudioChunk::SamplesData16() const { 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return reinterpret_cast<const int16*>(data_string_.data()); 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)AudioBuffer::AudioBuffer(int bytes_per_sample) 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : bytes_per_sample_(bytes_per_sample) { 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(bytes_per_sample == 1 || 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bytes_per_sample == 2 || 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bytes_per_sample == 4); 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)AudioBuffer::~AudioBuffer() { 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Clear(); 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void AudioBuffer::Enqueue(const uint8* data, size_t length) { 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) chunks_.push_back(new AudioChunk(data, length, bytes_per_sample_)); 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)scoped_refptr<AudioChunk> AudioBuffer::DequeueSingleChunk() { 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(!chunks_.empty()); 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) scoped_refptr<AudioChunk> chunk(chunks_.front()); 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) chunks_.pop_front(); 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return chunk; 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)scoped_refptr<AudioChunk> AudioBuffer::DequeueAll() { 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) scoped_refptr<AudioChunk> chunk(new AudioChunk(bytes_per_sample_)); 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t resulting_length = 0; 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ChunksContainer::const_iterator it; 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // In order to improve performance, calulate in advance the total length 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // and then copy the chunks. 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (it = chunks_.begin(); it != chunks_.end(); ++it) { 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) resulting_length += (*it)->data_string_.length(); 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) chunk->data_string_.reserve(resulting_length); 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (it = chunks_.begin(); it != chunks_.end(); ++it) { 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) chunk->data_string_.append((*it)->data_string_); 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Clear(); 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return chunk; 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void AudioBuffer::Clear() { 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) chunks_.clear(); 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool AudioBuffer::IsEmpty() const { 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return chunks_.empty(); 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace content 92