mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-24 11:40:37 +08:00
94 lines
2.7 KiB
C++
94 lines
2.7 KiB
C++
/*
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* Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
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*
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* This file is part of ZLMediaKit(https://github.com/ZLMediaKit/ZLMediaKit).
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*
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* Use of this source code is governed by MIT license that can be found in the
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* LICENSE file in the root of the source tree. All contributing project authors
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* may be found in the AUTHORS file in the root of the source tree.
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*/
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#include "Util/logger.h"
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#include "AudioSRC.h"
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#include "SDLAudioDevice.h"
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using namespace std;
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using namespace toolkit;
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INSTANCE_IMP(SDLAudioDevice);
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SDLAudioDevice::~SDLAudioDevice() {
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SDL_CloseAudio();
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}
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SDLAudioDevice::SDLAudioDevice() {
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SDL_AudioSpec wanted_spec;
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wanted_spec.freq = DEFAULT_SAMPLERATE;
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wanted_spec.format = DEFAULT_FORMAT;
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wanted_spec.channels = DEFAULT_CHANNEL;
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wanted_spec.silence = 0;
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wanted_spec.samples = DEFAULT_SAMPLES;
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wanted_spec.userdata = this;
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wanted_spec.callback = [](void *userdata, Uint8 *stream, int len) {
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SDLAudioDevice *_this = (SDLAudioDevice *) userdata;
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_this->onReqPCM((char *) stream, len);
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};
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if (SDL_OpenAudioDevice(NULL, 0, &wanted_spec, &_audio_config, SDL_AUDIO_ALLOW_ANY_CHANGE) < 0) {
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throw std::runtime_error("SDL_OpenAudioDevice failed");
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}
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InfoL << "actual audioSpec, " << "freq:" << _audio_config.freq
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<< ", format:" << hex << _audio_config.format << dec
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<< ", channels:" << (int) _audio_config.channels
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<< ", samples:" << _audio_config.samples
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<< ", pcm size:" << _audio_config.size;
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_play_buf.reset(new char[_audio_config.size], [](char *ptr) {
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delete[] ptr;
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});
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}
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void SDLAudioDevice::addChannel(AudioSRC *chn) {
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lock_guard<recursive_mutex> lck(_channel_mtx);
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if (_channels.empty()) {
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SDL_PauseAudio(0);
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}
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chn->setOutputAudioConfig(_audio_config);
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_channels.emplace(chn);
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}
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void SDLAudioDevice::delChannel(AudioSRC *chn) {
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lock_guard<recursive_mutex> lck(_channel_mtx);
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_channels.erase(chn);
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if (_channels.empty()) {
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SDL_PauseAudio(true);
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}
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}
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void SDLAudioDevice::onReqPCM(char *stream, int len) {
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lock_guard<recursive_mutex> lck(_channel_mtx);
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int size;
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int channel = 0;
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for (auto &chn : _channels) {
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if (channel == 0) {
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size = chn->getPCMData(_play_buf.get(), len);
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if (size) {
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memcpy(stream, _play_buf.get(), size);
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}
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} else {
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size = chn->getPCMData(_play_buf.get(), len);
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if (size) {
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SDL_MixAudio((Uint8 *) stream, (Uint8 *) _play_buf.get(), size, SDL_MIX_MAXVOLUME);
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}
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}
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if (size) {
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channel++;
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}
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}
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if (!channel) {
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memset(stream, 0, len);
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}
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}
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