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comparison src/audio/dart/SDL_dart.c @ 3851:405a192b68e7 SDL-1.2

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Backport from 1.3: most of the audio drivers can now handle data conversion at a higher level when they can't open the hardware in the exact format requested.
author Ryan C. Gordon <icculus@icculus.org>
date Fri, 01 Sep 2006 22:50:24 +0000
parents d910939febfa
children 5b5e549382b3
comparison
equal deleted inserted replaced
3850:28db418c7573 3851:405a192b68e7
73 } 73 }
74 74
75 75
76 int DART_OpenAudio(_THIS, SDL_AudioSpec *spec) 76 int DART_OpenAudio(_THIS, SDL_AudioSpec *spec)
77 { 77 {
78 SDL_AudioFormat test_format = SDL_FirstAudioFormat(spec->format);
79 int valid_datatype = 0;
78 MCI_AMP_OPEN_PARMS AmpOpenParms; 80 MCI_AMP_OPEN_PARMS AmpOpenParms;
79 MCI_GENERIC_PARMS GenericParms; 81 MCI_GENERIC_PARMS GenericParms;
80 int iDeviceOrd = 0; // Default device to be used 82 int iDeviceOrd = 0; // Default device to be used
81 int bOpenShared = 1; // Try opening it shared 83 int bOpenShared = 1; // Try opening it shared
82 int iBits = 16; // Default is 16 bits signed 84 int iBits = 16; // Default is 16 bits signed
104 // Save the device ID we got from DART! 106 // Save the device ID we got from DART!
105 // We will use this in the next calls! 107 // We will use this in the next calls!
106 iDeviceOrd = AmpOpenParms.usDeviceID; 108 iDeviceOrd = AmpOpenParms.usDeviceID;
107 109
108 // Determine the audio parameters from the AudioSpec 110 // Determine the audio parameters from the AudioSpec
109 switch ( spec->format & 0xFF ) 111 if (spec->channels > 2)
110 { 112 spec->channels = 2; // !!! FIXME: more than stereo support in OS/2?
111 case 8: 113
112 /* Unsigned 8 bit audio data */ 114 while ((!valid_datatype) && (test_format)) {
113 spec->format = AUDIO_U8; 115 spec->format = test_format;
116 valid_datatype = 1;
117 switch (test_format) {
118 case AUDIO_U8:
119 // Unsigned 8 bit audio data
114 iSilence = 0x80; 120 iSilence = 0x80;
115 iBits = 8; 121 iBits = 8;
116 break; 122 break;
117 case 16: 123
118 /* Signed 16 bit audio data */ 124 case AUDIO_S16LSB:
119 spec->format = AUDIO_S16; 125 // Signed 16 bit audio data
120 iSilence = 0x00; 126 iSilence = 0x00;
121 iBits = 16; 127 iBits = 16;
122 break; 128 break;
123 default: 129
124 // Close DART, and exit with error code! 130 default:
125 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0); 131 valid_datatype = 0;
126 SDL_SetError("Unsupported audio format"); 132 test_format = SDL_NextAudioFormat();
127 return(-1); 133 break;
128 } 134 }
135 }
136
137 if (!valid_datatype) { // shouldn't happen, but just in case...
138 // Close DART, and exit with error code!
139 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0);
140 SDL_SetError("Unsupported audio format");
141 return (-1);
142 }
143
129 iFreq = spec->freq; 144 iFreq = spec->freq;
130 iChannels = spec->channels; 145 iChannels = spec->channels;
131 /* Update the fragment size as size in bytes */ 146 /* Update the fragment size as size in bytes */
132 SDL_CalculateAudioSpec(spec); 147 SDL_CalculateAudioSpec(spec);
133 iBufSize = spec->size; 148 iBufSize = spec->size;