src/audio/psp/SDL_pspaudio.c
author Sam Lantinga
Sat, 18 May 2013 14:17:52 -0700
changeset 7191 75360622e65f
parent 7038 7f22b9ba218f
child 7663 53fe1b64eb2d
permissions -rw-r--r--
File style cleanup for the SDL 2.0 release
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2013 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 <stdio.h>
    23 #include <string.h>
    24 #include <stdlib.h>
    25 #include <malloc.h>
    26 
    27 #include "SDL_audio.h"
    28 #include "SDL_error.h"
    29 #include "SDL_timer.h"
    30 #include "../SDL_audiomem.h"
    31 #include "../SDL_audio_c.h"
    32 #include "../SDL_audiodev_c.h"
    33 #include "../SDL_sysaudio.h"
    34 #include "SDL_pspaudio.h"
    35 
    36 #include <pspaudio.h>
    37 #include <pspthreadman.h>
    38 
    39 /* The tag name used by PSP audio */
    40 #define PSPAUD_DRIVER_NAME         "psp"
    41 
    42 static int
    43 PSPAUD_OpenDevice(_THIS, const char *devname, int iscapture)
    44 {
    45     int format, mixlen, i;
    46     this->hidden = (struct SDL_PrivateAudioData *)
    47         SDL_malloc(sizeof(*this->hidden));
    48     if (this->hidden == NULL) {
    49         return SDL_OutOfMemory();
    50     }
    51     SDL_memset(this->hidden, 0, sizeof(*this->hidden));
    52     switch (this->spec.format & 0xff) {
    53         case 8:
    54         case 16:
    55             this->spec.format = AUDIO_S16LSB;
    56             break;
    57         default:
    58             return SDL_SetError("Unsupported audio format");
    59     }
    60 
    61     /* The sample count must be a multiple of 64. */
    62     this->spec.samples = PSP_AUDIO_SAMPLE_ALIGN(this->spec.samples);
    63     this->spec.freq = 44100;
    64 
    65     /* Update the fragment size as size in bytes. */
    66 //  SDL_CalculateAudioSpec(this->spec); MOD
    67     switch (this->spec.format) {
    68     case AUDIO_U8:
    69         this->spec.silence = 0x80;
    70         break;
    71     default:
    72         this->spec.silence = 0x00;
    73         break;
    74     }
    75     this->spec.size = SDL_AUDIO_BITSIZE(this->spec.format) / 8;
    76     this->spec.size *= this->spec.channels;
    77     this->spec.size *= this->spec.samples;
    78 
    79 //==========================================
    80 
    81     /* Allocate the mixing buffer.  Its size and starting address must
    82        be a multiple of 64 bytes.  Our sample count is already a multiple of
    83        64, so spec->size should be a multiple of 64 as well. */
    84     mixlen = this->spec.size * NUM_BUFFERS;
    85     this->hidden->rawbuf = (Uint8 *) memalign(64, mixlen);
    86     if (this->hidden->rawbuf == NULL) {
    87         return SDL_SetError("Couldn't allocate mixing buffer");
    88     }
    89 
    90     /* Setup the hardware channel. */
    91     if (this->spec.channels == 1) {
    92         format = PSP_AUDIO_FORMAT_MONO;
    93     } else {
    94         format = PSP_AUDIO_FORMAT_STEREO;
    95     }
    96     this->hidden->channel = sceAudioChReserve(PSP_AUDIO_NEXT_CHANNEL, this->spec.samples, format);
    97     if (this->hidden->channel < 0) {
    98         free(this->hidden->rawbuf);
    99         this->hidden->rawbuf = NULL;
   100         return SDL_SetError("Couldn't reserve hardware channel");
   101     }
   102 
   103     memset(this->hidden->rawbuf, 0, mixlen);
   104     for (i = 0; i < NUM_BUFFERS; i++) {
   105         this->hidden->mixbufs[i] = &this->hidden->rawbuf[i * this->spec.size];
   106     }
   107 
   108     this->hidden->next_buffer = 0;
   109     return 0;
   110 }
   111 
   112 static void PSPAUD_PlayDevice(_THIS)
   113 {
   114     Uint8 *mixbuf = this->hidden->mixbufs[this->hidden->next_buffer];
   115 
   116     if (this->spec.channels == 1) {
   117         sceAudioOutputBlocking(this->hidden->channel, PSP_AUDIO_VOLUME_MAX, mixbuf);
   118     } else {
   119         sceAudioOutputPannedBlocking(this->hidden->channel, PSP_AUDIO_VOLUME_MAX, PSP_AUDIO_VOLUME_MAX, mixbuf);
   120     }
   121 
   122     this->hidden->next_buffer = (this->hidden->next_buffer + 1) % NUM_BUFFERS;
   123 }
   124 
   125 /* This function waits until it is possible to write a full sound buffer */
   126 static void PSPAUD_WaitDevice(_THIS)
   127 {
   128     /* Because we block when sending audio, there's no need for this function to do anything. */
   129 }
   130 static Uint8 *PSPAUD_GetDeviceBuf(_THIS)
   131 {
   132     return this->hidden->mixbufs[this->hidden->next_buffer];
   133 }
   134 
   135 static void PSPAUD_CloseDevice(_THIS)
   136 {
   137     if (this->hidden->channel >= 0) {
   138         sceAudioChRelease(this->hidden->channel);
   139         this->hidden->channel = -1;
   140     }
   141 
   142     if (this->hidden->rawbuf != NULL) {
   143         free(this->hidden->rawbuf);
   144         this->hidden->rawbuf = NULL;
   145     }
   146 }
   147 static void PSPAUD_ThreadInit(_THIS)
   148 {
   149     /* Increase the priority of this audio thread by 1 to put it
   150        ahead of other SDL threads. */
   151     SceUID thid;
   152     SceKernelThreadInfo status;
   153     thid = sceKernelGetThreadId();
   154     status.size = sizeof(SceKernelThreadInfo);
   155     if (sceKernelReferThreadStatus(thid, &status) == 0) {
   156         sceKernelChangeThreadPriority(thid, status.currentPriority - 1);
   157     }
   158 }
   159 
   160 
   161 static int
   162 PSPAUD_Init(SDL_AudioDriverImpl * impl)
   163 {
   164 
   165     // Set the function pointers
   166     impl->OpenDevice = PSPAUD_OpenDevice;
   167     impl->PlayDevice = PSPAUD_PlayDevice;
   168     impl->WaitDevice = PSPAUD_WaitDevice;
   169     impl->GetDeviceBuf = PSPAUD_GetDeviceBuf;
   170     impl->WaitDone = PSPAUD_WaitDevice;
   171     impl->CloseDevice = PSPAUD_CloseDevice;
   172     impl->ThreadInit = PSPAUD_ThreadInit;
   173 
   174     //PSP audio device
   175     impl->OnlyHasDefaultOutputDevice = 1;
   176 /*
   177     impl->HasCaptureSupport = 1;
   178 
   179     impl->OnlyHasDefaultInputDevice = 1;
   180 */
   181     /*
   182     impl->DetectDevices = DSOUND_DetectDevices;
   183     impl->Deinitialize = DSOUND_Deinitialize;
   184     */
   185     return 1;   /* this audio target is available. */
   186 }
   187 
   188 AudioBootStrap PSPAUD_bootstrap = {
   189     "psp", "PSP audio driver", PSPAUD_Init, 0
   190 };
   191 
   192  /* SDL_AUDI*/
   193 
   194 
   195