15c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)/*
25c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * Copyright (C) 2012 Google Inc. All rights reserved.
35c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) *
45c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * Redistribution and use in source and binary forms, with or without
55c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * modification, are permitted provided that the following conditions
65c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * are met:
75c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) *
85c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 1.  Redistributions of source code must retain the above copyright
95c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) *     notice, this list of conditions and the following disclaimer.
105c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 2.  Redistributions in binary form must reproduce the above copyright
115c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) *     notice, this list of conditions and the following disclaimer in the
125c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) *     documentation and/or other materials provided with the distribution.
135c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
145c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) *     its contributors may be used to endorse or promote products derived
155c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) *     from this software without specific prior written permission.
165c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) *
175c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
185c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
195c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
205c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
215c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
225c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
235c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
245c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
255c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
265c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
275c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) */
285c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)
295c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#include "config.h"
305c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)
315c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#if ENABLE(WEB_AUDIO)
325c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)
331e202183a5dc46166763171984b285173f8585e5Torne (Richard Coles)#include "platform/audio/AudioPullFIFO.h"
345c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)
35c1847b1379d12d0e05df27436bf19a9b1bf12deaTorne (Richard Coles)namespace blink {
365c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)
375c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)AudioPullFIFO::AudioPullFIFO(AudioSourceProvider& audioProvider, unsigned numberOfChannels, size_t fifoLength, size_t providerSize)
385c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)    : m_provider(audioProvider)
395c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)    , m_fifo(numberOfChannels, fifoLength)
405c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)    , m_providerSize(providerSize)
4181a5157921f1d2a7ff6aae115bfe3c139b38a5c8Torne (Richard Coles)    , m_tempBus(AudioBus::create(numberOfChannels, providerSize))
425c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){
435c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)}
445c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)
455c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)void AudioPullFIFO::consume(AudioBus* destination, size_t framesToConsume)
465c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){
475c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)    if (!destination)
485c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)        return;
495c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)
505c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)    if (framesToConsume > m_fifo.framesInFifo()) {
515c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)        // We don't have enough data in the FIFO to fulfill the request. Ask for more data.
525c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)        fillBuffer(framesToConsume - m_fifo.framesInFifo());
535c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)    }
545c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)
555c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)    m_fifo.consume(destination, framesToConsume);
565c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)}
575c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)
585c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)void AudioPullFIFO::fillBuffer(size_t numberOfFrames)
595c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){
605c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)    // Keep asking the provider to give us data until we have received at least |numberOfFrames| of
615c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)    // data. Stuff the data into the FIFO.
625c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)    size_t framesProvided = 0;
635c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)
645c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)    while (framesProvided < numberOfFrames) {
6581a5157921f1d2a7ff6aae115bfe3c139b38a5c8Torne (Richard Coles)        m_provider.provideInput(m_tempBus.get(), m_providerSize);
665c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)
6781a5157921f1d2a7ff6aae115bfe3c139b38a5c8Torne (Richard Coles)        m_fifo.push(m_tempBus.get());
685c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)
695c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)        framesProvided += m_providerSize;
705c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)    }
715c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)}
725c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)
73c1847b1379d12d0e05df27436bf19a9b1bf12deaTorne (Richard Coles)} // namespace blink
745c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)
755c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#endif // ENABLE(WEB_AUDIO)
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