src/audio/psp/SDL_pspaudio.c
author Ryan C. Gordon
Sun, 31 Mar 2013 13:05:40 -0400
changeset 7038 7f22b9ba218f
parent 7009 161b7b6a5303
child 7191 75360622e65f
permissions -rw-r--r--
Changed audio subsystem's OpenDevice interface to return -1 on error.

This lets us 'return SDL_SetError("whatever");' on one line.

Fixes Bugzilla #1778.
     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