1 /*
2 *
3 * Copyright (C) 2018 The Android Open Source Project
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 #include "sdl_wrapper.h"
19
20 #include "glog/logging.h"
21 #include <SDL2/SDL.h>
22
23 #include <cstdint>
24
25 using cfp::SDLAudioDevice;
26 using cfp::SDLLib;
27
SDLAudioDevice(SDLAudioDevice && other)28 SDLAudioDevice::SDLAudioDevice(SDLAudioDevice&& other)
29 : device_id_{other.device_id_} {
30 other.device_id_ = 0;
31 }
operator =(SDLAudioDevice && other)32 SDLAudioDevice& SDLAudioDevice::operator=(SDLAudioDevice&& other) {
33 close();
34 device_id_ = other.device_id_;
35 other.device_id_ = 0;
36 return *this;
37 }
38
~SDLAudioDevice()39 SDLAudioDevice::~SDLAudioDevice() { close(); }
40
QueueAudio(const void * data,std::uint32_t len)41 int SDLAudioDevice::QueueAudio(const void* data, std::uint32_t len) {
42 return SDL_QueueAudio(device_id_, data, len);
43 }
44
SDLAudioDevice(SDL_AudioDeviceID device_id)45 SDLAudioDevice::SDLAudioDevice(SDL_AudioDeviceID device_id)
46 : device_id_{device_id} {}
47
close()48 void SDLAudioDevice::close() {
49 if (device_id_ != 0) {
50 SDL_CloseAudioDevice(device_id_);
51 }
52 }
53
SDLLib()54 SDLLib::SDLLib() { SDL_Init(SDL_INIT_AUDIO); }
~SDLLib()55 SDLLib::~SDLLib() { SDL_Quit(); }
56
OpenAudioDevice(int freq,std::uint8_t num_channels)57 SDLAudioDevice SDLLib::OpenAudioDevice(int freq, std::uint8_t num_channels) {
58 SDL_AudioSpec wav_spec{};
59 wav_spec.freq = freq;
60 wav_spec.format = AUDIO_S16LSB;
61 wav_spec.channels = num_channels;
62 wav_spec.silence = 0;
63 // .samples seems to work as low as 256,
64 // docs say this is 4096 when used with SDL_LoadWAV so I'm sticking with
65 // that
66 wav_spec.samples = 4096;
67 wav_spec.size = 0;
68
69 auto audio_device_id = SDL_OpenAudioDevice(nullptr, 0, &wav_spec, nullptr, 0);
70 if (audio_device_id == 0) {
71 LOG(FATAL) << "failed to open audio device: " << SDL_GetError() << '\n';
72 }
73 SDL_PauseAudioDevice(audio_device_id, false);
74 return SDLAudioDevice{audio_device_id};
75 }
76