1/* Copyright (c) 2013-2015 Jeffrey Pfau
 2 *
 3 * This Source Code Form is subject to the terms of the Mozilla Public
 4 * License, v. 2.0. If a copy of the MPL was not distributed with this
 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 6#include "AudioDevice.h"
 7
 8#include "LogController.h"
 9
10#include "core/thread.h"
11#include "gba/audio.h"
12
13using namespace QGBA;
14
15AudioDevice::AudioDevice(QObject* parent)
16	: QIODevice(parent)
17	, m_context(nullptr)
18{
19	setOpenMode(ReadOnly);
20}
21
22void AudioDevice::setFormat(const QAudioFormat& format) {
23	if (!m_context || !mCoreThreadIsActive(m_context)) {
24		LOG(QT, INFO) << tr("Can't set format of context-less audio device");
25		return;
26	}
27	double fauxClock = GBAAudioCalculateRatio(1, m_context->sync.fpsTarget, 1);
28	mCoreSyncLockAudio(&m_context->sync);
29	blip_set_rates(m_context->core->getAudioChannel(m_context->core, 0),
30		           m_context->core->frequency(m_context->core), format.sampleRate() * fauxClock);
31	blip_set_rates(m_context->core->getAudioChannel(m_context->core, 1),
32		           m_context->core->frequency(m_context->core), format.sampleRate() * fauxClock);
33	mCoreSyncUnlockAudio(&m_context->sync);
34}
35
36void AudioDevice::setInput(mCoreThread* input) {
37	m_context = input;
38}
39
40qint64 AudioDevice::readData(char* data, qint64 maxSize) {
41	if (maxSize > 0xFFFFFFFFLL) {
42		maxSize = 0xFFFFFFFFLL;
43	}
44
45	if (!m_context->core) {
46		LOG(QT, WARN) << tr("Audio device is missing its core");
47		return 0;
48	}
49
50	mCoreSyncLockAudio(&m_context->sync);
51	int available = blip_samples_avail(m_context->core->getAudioChannel(m_context->core, 0));
52	if (available > maxSize / sizeof(GBAStereoSample)) {
53		available = maxSize / sizeof(GBAStereoSample);
54	}
55	blip_read_samples(m_context->core->getAudioChannel(m_context->core, 0), &reinterpret_cast<GBAStereoSample*>(data)->left, available, true);
56	blip_read_samples(m_context->core->getAudioChannel(m_context->core, 1), &reinterpret_cast<GBAStereoSample*>(data)->right, available, true);
57	mCoreSyncConsumeAudio(&m_context->sync);
58	return available * sizeof(GBAStereoSample);
59}
60
61qint64 AudioDevice::writeData(const char*, qint64) {
62	LOG(QT, WARN) << tr("Writing data to read-only audio device");
63	return 0;
64}