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#ifdef _WIN32
#include <winsock2.h>
#endif
#include "manager.hpp"
#include <array>
#define MINIAUDIO_IMPLEMENTATION
#include <miniaudio.h>
#include <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_mutex);
auto *pOutputF32 = static_cast<float *>(pOutput);
for (auto &[ssrc, pair] : mgr->m_sources) {
auto &buf = pair.first;
const size_t n = std::min(buf.size(), frameCount * 2ULL);
for (size_t i = 0; i < n; i++) {
pOutputF32[i] += buf[i] / 32768.F;
}
buf.erase(buf.begin(), buf.begin() + n);
}
}
AudioManager::AudioManager() {
m_ok = true;
m_device_config = ma_device_config_init(ma_device_type_playback);
m_device_config.playback.format = ma_format_f32;
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;
}
}
AudioManager::~AudioManager() {
ma_device_uninit(&m_device);
for (auto &[ssrc, pair] : m_sources) {
opus_decoder_destroy(pair.second);
}
}
void AudioManager::FeedMeOpus(uint32_t ssrc, 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> pcm;
if (m_sources.find(ssrc) == m_sources.end()) {
int err;
auto *decoder = opus_decoder_create(48000, 2, &err);
m_sources.insert(std::make_pair(ssrc, std::make_pair(std::deque<int16_t> {}, decoder)));
}
int decoded = opus_decode(m_sources.at(ssrc).second, opus_encoded, static_cast<opus_int32>(payload_size), pcm.data(), 120 * 48, 0);
if (decoded <= 0) {
} else {
m_mutex.lock();
auto &buf = m_sources.at(ssrc).first;
buf.insert(buf.end(), pcm.begin(), pcm.begin() + decoded * 2);
m_mutex.unlock();
}
}
bool AudioManager::OK() const {
return m_ok;
}
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