cscg22-gearboy

CSCG 2022 Challenge 'Gearboy'
git clone https://git.sinitax.com/sinitax/cscg22-gearboy
Log | Files | Refs | sfeed.txt

SDL_naclaudio.c (4962B)

      1/*
      2  Simple DirectMedia Layer
      3  Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
      4
      5  This software is provided 'as-is', without any express or implied
      6  warranty.  In no event will the authors be held liable for any damages
      7  arising from the use of this software.
      8
      9  Permission is granted to anyone to use this software for any purpose,
     10  including commercial applications, and to alter it and redistribute it
     11  freely, subject to the following restrictions:
     12
     13  1. The origin of this software must not be misrepresented; you must not
     14     claim that you wrote the original software. If you use this software
     15     in a product, an acknowledgment in the product documentation would be
     16     appreciated but is not required.
     17  2. Altered source versions must be plainly marked as such, and must not be
     18     misrepresented as being the original software.
     19  3. This notice may not be removed or altered from any source distribution.
     20*/
     21
     22#include "../../SDL_internal.h"
     23#include "SDL_naclaudio.h"
     24
     25#include "SDL_audio.h"
     26#include "SDL_mutex.h"
     27#include "../SDL_audiomem.h"
     28#include "../SDL_audio_c.h"
     29#include "../SDL_audiodev_c.h"
     30
     31#include "ppapi/c/pp_errors.h"
     32#include "ppapi/c/pp_instance.h"
     33#include "ppapi_simple/ps.h"
     34#include "ppapi_simple/ps_interface.h"
     35#include "ppapi_simple/ps_event.h"
     36
     37/* The tag name used by NACL audio */
     38#define NACLAUD_DRIVER_NAME         "nacl"
     39
     40#define SAMPLE_FRAME_COUNT 4096
     41
     42/* Audio driver functions */
     43static int NACLAUD_OpenDevice(_THIS, const char *devname, int iscapture);
     44static void NACLAUD_CloseDevice(_THIS);
     45static void nacl_audio_callback(void* samples, uint32_t buffer_size, PP_TimeDelta latency, void* data);
     46
     47/* FIXME: Make use of latency if needed */
     48static void nacl_audio_callback(void* samples, uint32_t buffer_size, PP_TimeDelta latency, void* data) {
     49    SDL_AudioDevice* _this = (SDL_AudioDevice*) data;
     50    
     51    SDL_LockMutex(private->mutex);
     52
     53    if (_this->enabled && !_this->paused) {
     54        if (_this->convert.needed) {
     55            SDL_LockMutex(_this->mixer_lock);
     56            (*_this->spec.callback) (_this->spec.userdata,
     57                                     (Uint8 *) _this->convert.buf,
     58                                     _this->convert.len);
     59            SDL_UnlockMutex(_this->mixer_lock);
     60            SDL_ConvertAudio(&_this->convert);
     61            SDL_memcpy(samples, _this->convert.buf, _this->convert.len_cvt);
     62        } else {
     63            SDL_LockMutex(_this->mixer_lock);
     64            (*_this->spec.callback) (_this->spec.userdata, (Uint8 *) samples, buffer_size);
     65            SDL_UnlockMutex(_this->mixer_lock);
     66        }
     67    } else {
     68        SDL_memset(samples, 0, buffer_size);
     69    }
     70    
     71    return;
     72}
     73
     74static void NACLAUD_CloseDevice(SDL_AudioDevice *device) {
     75    const PPB_Core *core = PSInterfaceCore();
     76    const PPB_Audio *ppb_audio = PSInterfaceAudio();
     77    SDL_PrivateAudioData *hidden = (SDL_PrivateAudioData *) device->hidden;
     78    
     79    ppb_audio->StopPlayback(hidden->audio);
     80    SDL_DestroyMutex(hidden->mutex);
     81    core->ReleaseResource(hidden->audio);
     82}
     83
     84static int
     85NACLAUD_OpenDevice(_THIS, const char *devname, int iscapture) {
     86    PP_Instance instance = PSGetInstanceId();
     87    const PPB_Audio *ppb_audio = PSInterfaceAudio();
     88    const PPB_AudioConfig *ppb_audiocfg = PSInterfaceAudioConfig();
     89    
     90    private = (SDL_PrivateAudioData *) SDL_calloc(1, (sizeof *private));
     91    if (private == NULL) {
     92        SDL_OutOfMemory();
     93        return 0;
     94    }
     95    
     96    private->mutex = SDL_CreateMutex();
     97    _this->spec.freq = 44100;
     98    _this->spec.format = AUDIO_S16LSB;
     99    _this->spec.channels = 2;
    100    _this->spec.samples = ppb_audiocfg->RecommendSampleFrameCount(
    101        instance, 
    102        PP_AUDIOSAMPLERATE_44100, 
    103        SAMPLE_FRAME_COUNT);
    104    
    105    /* Calculate the final parameters for this audio specification */
    106    SDL_CalculateAudioSpec(&_this->spec);
    107    
    108    private->audio = ppb_audio->Create(
    109        instance,
    110        ppb_audiocfg->CreateStereo16Bit(instance, PP_AUDIOSAMPLERATE_44100, _this->spec.samples),
    111        nacl_audio_callback, 
    112        _this);
    113    
    114    /* Start audio playback while we are still on the main thread. */
    115    ppb_audio->StartPlayback(private->audio);
    116    
    117    return 1;
    118}
    119
    120static int
    121NACLAUD_Init(SDL_AudioDriverImpl * impl)
    122{
    123    if (PSGetInstanceId() == 0) {
    124        return 0;
    125    }
    126    
    127    /* Set the function pointers */
    128    impl->OpenDevice = NACLAUD_OpenDevice;
    129    impl->CloseDevice = NACLAUD_CloseDevice;
    130    impl->HasCaptureSupport = 0;
    131    impl->OnlyHasDefaultOutputDevice = 1;
    132    impl->OnlyHasDefaultInputDevice = 1;
    133    impl->ProvidesOwnCallbackThread = 1;
    134    /*
    135     *    impl->WaitDevice = NACLAUD_WaitDevice;
    136     *    impl->GetDeviceBuf = NACLAUD_GetDeviceBuf;
    137     *    impl->PlayDevice = NACLAUD_PlayDevice;
    138     *    impl->Deinitialize = NACLAUD_Deinitialize;
    139     */
    140    
    141    return 1;
    142}
    143
    144AudioBootStrap NACLAUD_bootstrap = {
    145    NACLAUD_DRIVER_NAME, "SDL NaCl Audio Driver",
    146    NACLAUD_Init, 0
    147};