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annotate src/audio/mint/SDL_mintaudio.c @ 1035:974ba6ae0fa3

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Date: Wed, 26 Jan 2005 13:37:09 GMT From: Peter Naulls Subject: RISC OS SDL Patches Sam, I've attached a diff of the latest changes to libSDL for RISC OS support. These changes are by Alan Buckley and myself. The most significant of these are: Optimised assembler blit rountines - I've attached the file src/video/riscos/SDL_riscosASM.s which is needed for this. Move to using /dev/dsp instead of its own audio implementation. This means that src/audio/riscos/SDL_drenderer.c should be removed Typo fixes. Mainly correct spelling of "RISC OS", but some from elsewhere too.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 12 Feb 2005 18:01:31 +0000
parents 2eca15c3f609
children 856f76a099c7
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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
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23 /*
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24 Audio interrupt variables and callback function
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25
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26 Patrice Mandin
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27 */
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28
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29 #include <string.h>
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30
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31 #include "SDL_types.h"
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32 #include "SDL_audio.h"
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33
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34 #include "SDL_mintaudio.h"
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35 #include "SDL_mintaudio_stfa.h"
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36
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37 /* The audio device */
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38
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39 SDL_AudioDevice *SDL_MintAudio_device;
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40 Uint8 *SDL_MintAudio_audiobuf[2]; /* Pointers to buffers */
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41 unsigned long SDL_MintAudio_audiosize; /* Length of audio buffer=spec->size */
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42 unsigned short SDL_MintAudio_numbuf; /* Buffer to play */
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43 unsigned short SDL_MintAudio_mutex;
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44 unsigned long SDL_MintAudio_clocktics;
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45 cookie_stfa_t *SDL_MintAudio_stfa;
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46
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47 /* The callback function, called by each driver whenever needed */
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48
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49 void SDL_MintAudio_Callback(void)
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50 {
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51 Uint8 *buffer;
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52 SDL_AudioDevice *audio = SDL_MintAudio_device;
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53
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54 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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55 memset(buffer, audio->spec.silence, audio->spec.size);
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56
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57 if (audio->paused)
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58 return;
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59
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60 if (audio->convert.needed) {
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61 int silence;
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62
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63 if ( audio->convert.src_format == AUDIO_U8 ) {
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64 silence = 0x80;
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65 } else {
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66 silence = 0;
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67 }
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68 memset(audio->convert.buf, silence, audio->convert.len);
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69 audio->spec.callback(audio->spec.userdata,
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70 (Uint8 *)audio->convert.buf,audio->convert.len);
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71 SDL_ConvertAudio(&audio->convert);
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72 memcpy(buffer, audio->convert.buf, audio->convert.len_cvt);
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73 } else {
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74 audio->spec.callback(audio->spec.userdata, buffer, audio->spec.size);
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75 }
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76 }
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77
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78 /* Add a new frequency/clock/predivisor to the current list */
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79 void SDL_MintAudio_AddFrequency(_THIS, Uint32 frequency, Uint32 clock, Uint32 prediv)
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80 {
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81 int i, p;
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82
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83 if (MINTAUDIO_freqcount==MINTAUDIO_maxfreqs) {
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84 return;
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85 }
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86
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87 /* Search where to insert the frequency (highest first) */
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88 for (p=0; p<MINTAUDIO_freqcount; p++) {
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89 if (frequency > MINTAUDIO_frequencies[p].frequency) {
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90 break;
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91 }
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92 }
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93
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94 /* Put all following ones farer */
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95 if (MINTAUDIO_freqcount>0) {
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96 for (i=MINTAUDIO_freqcount; i>p; i--) {
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97 MINTAUDIO_frequencies[i].frequency = MINTAUDIO_frequencies[i-1].frequency;
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98 MINTAUDIO_frequencies[i].masterclock = MINTAUDIO_frequencies[i-1].masterclock;
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99 MINTAUDIO_frequencies[i].predivisor = MINTAUDIO_frequencies[i-1].predivisor;
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100 }
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101 }
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102
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103 /* And insert new one */
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104 MINTAUDIO_frequencies[p].frequency = frequency;
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105 MINTAUDIO_frequencies[p].masterclock = clock;
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106 MINTAUDIO_frequencies[p].predivisor = prediv;
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107
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108 MINTAUDIO_freqcount++;
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109 }
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110
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111 /* Search for the nearest frequency */
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112 int SDL_MintAudio_SearchFrequency(_THIS, int desired_freq)
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113 {
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114 int i;
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115
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116 /* Only 1 freq ? */
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117 if (MINTAUDIO_freqcount==1) {
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118 return 0;
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119 }
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120
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121 /* Check the array */
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122 for (i=0; i<MINTAUDIO_freqcount; i++) {
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123 if (desired_freq >= ((MINTAUDIO_frequencies[i].frequency+
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124 MINTAUDIO_frequencies[i+1].frequency)>>1)) {
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125 return i;
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126 }
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127 }
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128
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129 /* Not in the array, give the latest */
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130 return MINTAUDIO_freqcount-1;
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131 }