annotate src/audio/nds/SDL_ndsaudio.c @ 2938:2929ed239d2a

Adjusted default choice of audio driver. If a driver can definitely see available devices, it is chosen. Otherwise, we'll take the first driver that initializes but saw no devices...this might be because it can't enumerate them, or there really aren't any available. This prevents the dsp driver from hogging control when there are no /dev/dsp* nodes (for example, on a Linux box with ALSA and no OSS emulation).
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 01 Jan 2009 07:54:58 +0000
parents 99210400e8b9
children 1e431c2631ee
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21
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22 This file written by Ryan C. Gordon (icculus@icculus.org)
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23 */
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24 #include "SDL_config.h"
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25
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26 /* Output audio to NDS */
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27
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28 #include <nds.h>
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29
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30 #include "SDL_audio.h"
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31 #include "../SDL_audio_c.h"
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32 #include "SDL_ndsaudio.h"
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33
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34 static int
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35 NDSAUD_OpenDevice(_THIS, const char *devname, int iscapture)
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36 {
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37 SDL_AudioFormat test_format = SDL_FirstAudioFormat(this->spec.format);
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38 int valid_datatype = 0;
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39
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40 this->hidden = SDL_malloc(sizeof(*(this->hidden)));
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41 if (!this->hidden) {
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42 SDL_OutOfMemory();
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43 return 0;
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44 }
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45 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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46
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47 while ((!valid_datatype) && (test_format)) {
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48 this->spec.format = test_format;
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49 switch (test_format) {
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50 case AUDIO_S8:
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51 /*case AUDIO_S16LSB: */
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52 valid_datatype = 1;
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53 break;
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54 default:
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55 test_format = SDL_NextAudioFormat();
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56 break;
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57 }
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58 }
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59
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60 /* set the generic sound parameters */
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61 setGenericSound(22050, /* sample rate */
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62 127, /* volume */
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63 64, /* panning/balance */
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64 0); /* sound format */
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65
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66 return 1;
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67 }
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68
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69 static void
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70 NDSAUD_PlayDevice(_THIS)
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71 {
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72 TransferSoundData *sound = SDL_malloc(sizeof(TransferSoundData));
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73 if (!sound) {
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74 SDL_OutOfMemory();
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75 }
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76
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77 playGenericSound(this->hidden->mixbuf, this->hidden->mixlen);
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78 #if 0
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79 // sound->data = this->hidden->mixbuf;/* pointer to raw audio data */
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80 // sound->len = this->hidden->mixlen; /* size of raw data pointed to above */
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81 // sound->rate = 22050; /* sample rate = 22050Hz */
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82 // sound->vol = 127; /* volume [0..127] for [min..max] */
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83 // sound->pan = 64; /* balance [0..127] for [left..right] */
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84 // sound->format = 0; /* 0 for 16-bit, 1 for 8-bit */
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85 // playSound(sound);
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86 #endif
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87 }
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88
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89
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90 static Uint8 *
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91 NDSAUD_GetDeviceBuf(_THIS)
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92 {
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93 return this->hidden->mixbuf; /* is this right? */
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94 }
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95
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96 static void
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97 NDSAUD_WaitDevice(_THIS)
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98 {
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99 /* stub */
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100 }
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101
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102 static void
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103 NDSAUD_CloseDevice(_THIS)
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104 {
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105 /* stub */
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106 }
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107
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108 static int
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109 NDSAUD_Init(SDL_AudioDriverImpl * impl)
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110 {
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111 /* Set the function pointers */
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112 impl->OpenDevice = NDSAUD_OpenDevice;
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113 impl->PlayDevice = NDSAUD_PlayDevice;
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114 impl->WaitDevice = NDSAUD_WaitDevice;
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115 impl->GetDeviceBuf = NDSAUD_GetDeviceBuf;
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116 impl->CloseDevice = NDSAUD_CloseDevice;
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117
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118 /* and the capabilities */
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119 impl->HasCaptureSupport = 1;
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120 impl->OnlyHasDefaultOutputDevice = 1;
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121 impl->OnlyHasDefaultInputDevice = 1;
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122
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123 return 2; /* 2 == definitely has an audio device. */
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124 }
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125
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126 AudioBootStrap NDSAUD_bootstrap = {
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127 "nds", "SDL NDS audio driver", NDSAUD_Init, 0 /*1? */
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128 };
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129
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130 /* vi: set ts=4 sw=4 expandtab: */