50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
#include "ibm.h"
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#include "sound.h"
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#include "sound_speaker.h"
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int speaker_mute = 0;
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static int16_t speaker_buffer[SOUNDBUFLEN];
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static int speaker_pos = 0;
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int speaker_gated = 0;
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int speaker_enable = 0, was_speaker_enable = 0;
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static void speaker_poll(void *p)
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{
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if (speaker_pos >= SOUNDBUFLEN) return;
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// printf("SPeaker - %i %i %i %02X\n",speakval,gated,speakon,pit.m[2]);
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if (speaker_gated && was_speaker_enable)
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{
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if (!pit.m[2] || pit.m[2]==4)
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speaker_buffer[speaker_pos] = speakval;
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else
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speaker_buffer[speaker_pos] = speakon ? 0x1400 : 0;
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}
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else
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speaker_buffer[speaker_pos] = was_speaker_enable ? 0x1400 : 0;
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speaker_pos++;
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if (!speaker_enable)
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was_speaker_enable = 0;
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}
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static void speaker_get_buffer(int16_t *buffer, int len, void *p)
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{
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int c;
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if (!speaker_mute)
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{
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for (c = 0; c < len * 2; c++)
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buffer[c] += speaker_buffer[c >> 1];
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}
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speaker_pos = 0;
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}
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void speaker_init()
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{
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sound_add_handler(speaker_poll, speaker_get_buffer, NULL);
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speaker_mute = 0;
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}
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