Atlas - SDL_pspaudio.c
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1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 Sam Lantinga <[email protected]>
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#include "../../SDL_internal.h"
22
23#if SDL_AUDIO_DRIVER_PSP
24
25#include <stdio.h>
26#include <string.h>
27#include <stdlib.h>
28#include <malloc.h>
29
30#include "SDL_audio.h"
31#include "SDL_error.h"
32#include "SDL_timer.h"
33#include "../SDL_audio_c.h"
34#include "../SDL_audiodev_c.h"
35#include "../SDL_sysaudio.h"
36#include "SDL_pspaudio.h"
37
38#include <pspaudio.h>
39#include <pspthreadman.h>
40
41/* The tag name used by PSP audio */
42#define PSPAUDIO_DRIVER_NAME         "psp"
43
44static int
45PSPAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
46{
47    int format, mixlen, i;
48    this->hidden = (struct SDL_PrivateAudioData *)
49        SDL_malloc(sizeof(*this->hidden));
50    if (this->hidden == NULL) {
51        return SDL_OutOfMemory();
52    }
53    SDL_zerop(this->hidden);
54    switch (this->spec.format & 0xff) {
55        case 8:
56        case 16:
57            this->spec.format = AUDIO_S16LSB;
58            break;
59        default:
60            return SDL_SetError("Unsupported audio format");
61    }
62
63    /* The sample count must be a multiple of 64. */
64    this->spec.samples = PSP_AUDIO_SAMPLE_ALIGN(this->spec.samples);
65    this->spec.freq = 44100;
66
67    /* Update the fragment size as size in bytes. */
68    SDL_CalculateAudioSpec(&this->spec);
69
70    /* Allocate the mixing buffer.  Its size and starting address must
71       be a multiple of 64 bytes.  Our sample count is already a multiple of
72       64, so spec->size should be a multiple of 64 as well. */
73    mixlen = this->spec.size * NUM_BUFFERS;
74    this->hidden->rawbuf = (Uint8 *) memalign(64, mixlen);
75    if (this->hidden->rawbuf == NULL) {
76        return SDL_SetError("Couldn't allocate mixing buffer");
77    }
78
79    /* Setup the hardware channel. */
80    if (this->spec.channels == 1) {
81        format = PSP_AUDIO_FORMAT_MONO;
82    } else {
83        this->spec.channels = 2;
84        format = PSP_AUDIO_FORMAT_STEREO;
85    }
86    this->hidden->channel = sceAudioChReserve(PSP_AUDIO_NEXT_CHANNEL, this->spec.samples, format);
87    if (this->hidden->channel < 0) {
88        free(this->hidden->rawbuf);
89        this->hidden->rawbuf = NULL;
90        return SDL_SetError("Couldn't reserve hardware channel");
91    }
92
93    memset(this->hidden->rawbuf, 0, mixlen);
94    for (i = 0; i < NUM_BUFFERS; i++) {
95        this->hidden->mixbufs[i] = &this->hidden->rawbuf[i * this->spec.size];
96    }
97
98    this->hidden->next_buffer = 0;
99    return 0;
100}
101
102static void PSPAUDIO_PlayDevice(_THIS)
103{
104    Uint8 *mixbuf = this->hidden->mixbufs[this->hidden->next_buffer];
105
106    if (this->spec.channels == 1) {
107        sceAudioOutputBlocking(this->hidden->channel, PSP_AUDIO_VOLUME_MAX, mixbuf);
108    } else {
109        sceAudioOutputPannedBlocking(this->hidden->channel, PSP_AUDIO_VOLUME_MAX, PSP_AUDIO_VOLUME_MAX, mixbuf);
110    }
111
112    this->hidden->next_buffer = (this->hidden->next_buffer + 1) % NUM_BUFFERS;
113}
114
115/* This function waits until it is possible to write a full sound buffer */
116static void PSPAUDIO_WaitDevice(_THIS)
117{
118    /* Because we block when sending audio, there's no need for this function to do anything. */
119}
120static Uint8 *PSPAUDIO_GetDeviceBuf(_THIS)
121{
122    return this->hidden->mixbufs[this->hidden->next_buffer];
123}
124
125static void PSPAUDIO_CloseDevice(_THIS)
126{
127    if (this->hidden->channel >= 0) {
128        sceAudioChRelease(this->hidden->channel);
129    }
130    free(this->hidden->rawbuf);  /* this uses memalign(), not SDL_malloc(). */
131    SDL_free(this->hidden);
132}
133
134static void PSPAUDIO_ThreadInit(_THIS)
135{
136    /* Increase the priority of this audio thread by 1 to put it
137       ahead of other SDL threads. */
138    SceUID thid;
139    SceKernelThreadInfo status;
140    thid = sceKernelGetThreadId();
141    status.size = sizeof(SceKernelThreadInfo);
142    if (sceKernelReferThreadStatus(thid, &status) == 0) {
143        sceKernelChangeThreadPriority(thid, status.currentPriority - 1);
144    }
145}
146
147
148static int
149PSPAUDIO_Init(SDL_AudioDriverImpl * impl)
150{
151    /* Set the function pointers */
152    impl->OpenDevice = PSPAUDIO_OpenDevice;
153    impl->PlayDevice = PSPAUDIO_PlayDevice;
154    impl->WaitDevice = PSPAUDIO_WaitDevice;
155    impl->GetDeviceBuf = PSPAUDIO_GetDeviceBuf;
156    impl->CloseDevice = PSPAUDIO_CloseDevice;
157    impl->ThreadInit = PSPAUDIO_ThreadInit;
158
159    /* PSP audio device */
160    impl->OnlyHasDefaultOutputDevice = 1;
161/*
162    impl->HasCaptureSupport = 1;
163
164    impl->OnlyHasDefaultCaptureDevice = 1;
165*/
166    /*
167    impl->DetectDevices = DSOUND_DetectDevices;
168    impl->Deinitialize = DSOUND_Deinitialize;
169    */
170    return 1;   /* this audio target is available. */
171}
172
173AudioBootStrap PSPAUDIO_bootstrap = {
174    "psp", "PSP audio driver", PSPAUDIO_Init, 0
175};
176
177 /* SDL_AUDI */
178
179#endif /* SDL_AUDIO_DRIVER_PSP */
180
181/* vi: set ts=4 sw=4 expandtab: */
182
[FILE END]
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