From 0fa33915da6255cf7460758197eaea7e43353543 Mon Sep 17 00:00:00 2001
From: ouwou <26526779+ouwou@users.noreply.github.com>
Date: Wed, 31 Aug 2022 01:51:02 -0400
Subject: rudimentary voice implementation

---
 src/audio/manager.cpp | 92 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 src/audio/manager.cpp

(limited to 'src/audio/manager.cpp')

diff --git a/src/audio/manager.cpp b/src/audio/manager.cpp
new file mode 100644
index 0000000..af36327
--- /dev/null
+++ b/src/audio/manager.cpp
@@ -0,0 +1,92 @@
+#ifdef _WIN32
+    #include <winsock2.h>
+#endif
+
+#include "manager.hpp"
+#include <array>
+#define MINIAUDIO_IMPLEMENTATION
+#include <miniaudio.h>
+#include <opus/opus.h>
+#include <cstring>
+
+const uint8_t *StripRTPExtensionHeader(const uint8_t *buf, int num_bytes, size_t &outlen) {
+    if (buf[0] == 0xbe && buf[1] == 0xde && num_bytes > 4) {
+        uint64_t offset = 4 + 4 * ((buf[2] << 8) | buf[3]);
+
+        outlen = num_bytes - offset;
+        return buf + offset;
+    }
+    outlen = num_bytes;
+    return buf;
+}
+
+void data_callback(ma_device *pDevice, void *pOutput, const void *pInput, ma_uint32 frameCount) {
+    AudioManager *mgr = reinterpret_cast<AudioManager *>(pDevice->pUserData);
+    if (mgr == nullptr) return;
+    std::lock_guard<std::mutex> _(mgr->m_dumb_mutex);
+
+    const auto buffered_frames = std::min(static_cast<ma_uint32>(mgr->m_dumb.size() / 2), frameCount);
+    auto *pOutputCast = static_cast<ma_int16 *>(pOutput);
+    for (ma_uint32 i = 0; i < buffered_frames * 2; i++) {
+        pOutputCast[i] = mgr->m_dumb.front();
+        mgr->m_dumb.pop();
+    }
+}
+
+AudioManager::AudioManager() {
+    m_ok = true;
+
+    m_device_config = ma_device_config_init(ma_device_type_playback);
+    m_device_config.playback.format = ma_format_s16;
+    m_device_config.playback.channels = 2;
+    m_device_config.sampleRate = 48000;
+    m_device_config.dataCallback = data_callback;
+    m_device_config.pUserData = this;
+
+    if (ma_device_init(nullptr, &m_device_config, &m_device) != MA_SUCCESS) {
+        puts("open playabck fail");
+        m_ok = false;
+        return;
+    }
+
+    if (ma_device_start(&m_device) != MA_SUCCESS) {
+        puts("failed to start playback");
+        ma_device_uninit(&m_device);
+        m_ok = false;
+        return;
+    }
+
+    int err;
+    m_opus_decoder = opus_decoder_create(48000, 2, &err);
+
+    m_active = true;
+    // m_thread = std::thread(&AudioManager::testthread, this);
+}
+
+AudioManager::~AudioManager() {
+    m_active = false;
+    ma_device_uninit(&m_device);
+}
+
+void AudioManager::FeedMeOpus(const std::vector<uint8_t> &data) {
+    size_t payload_size = 0;
+    const auto *opus_encoded = StripRTPExtensionHeader(data.data(), static_cast<int>(data.size()), payload_size);
+    static std::array<opus_int16, 120 * 48 * 2 * sizeof(opus_int16)> pcm;
+    int decoded = opus_decode(m_opus_decoder, opus_encoded, static_cast<opus_int32>(payload_size), pcm.data(), 120 * 48, 0);
+    if (decoded <= 0) {
+        printf("failed decode: %d\n", decoded);
+    } else {
+        m_dumb_mutex.lock();
+        for (size_t i = 0; i < decoded * 2; i++) {
+            m_dumb.push(pcm[i]);
+        }
+        m_dumb_mutex.unlock();
+    }
+}
+
+void AudioManager::testthread() {
+}
+
+bool AudioManager::OK() const {
+    return m_ok;
+}
-- 
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