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
10extern "C" {
11#include "gba/gba.h"
12#include "gba/audio.h"
13#include "gba/supervisor/thread.h"
14}
15
16using namespace QGBA;
17
18AudioDevice::AudioDevice(QObject* parent)
19	: QIODevice(parent)
20	, m_context(nullptr)
21	, m_drift(0)
22	, m_ratio(1.f)
23{
24	setOpenMode(ReadOnly);
25}
26
27void AudioDevice::setFormat(const QAudioFormat& format) {
28	if (!m_context || !GBAThreadIsActive(m_context)) {
29		LOG(INFO) << tr("Can't set format of context-less audio device");
30		return;
31	}
32	double fauxClock = GBAAudioCalculateRatio(1, m_context->fpsTarget, 1);
33	mCoreSyncLockAudio(&m_context->sync);
34	blip_set_rates(m_context->gba->audio.psg.left, GBA_ARM7TDMI_FREQUENCY, format.sampleRate() * fauxClock);
35	blip_set_rates(m_context->gba->audio.psg.right, GBA_ARM7TDMI_FREQUENCY, format.sampleRate() * fauxClock);
36	mCoreSyncUnlockAudio(&m_context->sync);
37}
38
39void AudioDevice::setInput(GBAThread* input) {
40	m_context = input;
41}
42
43qint64 AudioDevice::readData(char* data, qint64 maxSize) {
44	if (maxSize > 0xFFFFFFFF) {
45		maxSize = 0xFFFFFFFF;
46	}
47
48	if (!m_context->gba) {
49		LOG(WARN) << tr("Audio device is missing its GBA");
50		return 0;
51	}
52
53	mCoreSyncLockAudio(&m_context->sync);
54	int available = blip_samples_avail(m_context->gba->audio.psg.left);
55	if (available > maxSize / sizeof(GBAStereoSample)) {
56		available = maxSize / sizeof(GBAStereoSample);
57	}
58	blip_read_samples(m_context->gba->audio.psg.left, &reinterpret_cast<GBAStereoSample*>(data)->left, available, true);
59	blip_read_samples(m_context->gba->audio.psg.right, &reinterpret_cast<GBAStereoSample*>(data)->right, available, true);
60	mCoreSyncConsumeAudio(&m_context->sync);
61	return available * sizeof(GBAStereoSample);
62}
63
64qint64 AudioDevice::writeData(const char*, qint64) {
65	LOG(WARN) << tr("Writing data to read-only audio device");
66	return 0;
67}