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comparison psg.c @ 1551:ce1f93be0104

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Small cleanup to audio interface between emulation code and renderer backend
author Michael Pavone <pavone@retrodev.com>
date Wed, 28 Mar 2018 23:36:08 -0700
parents 9c65819afec3
children 6ce36c3f250b
comparison
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1550:b525491b4e5b 1551:ce1f93be0104
11 #include <stdio.h> 11 #include <stdio.h>
12 #include <math.h> 12 #include <math.h>
13 void psg_init(psg_context * context, uint32_t sample_rate, uint32_t master_clock, uint32_t clock_div, uint32_t samples_frame, uint32_t lowpass_cutoff) 13 void psg_init(psg_context * context, uint32_t sample_rate, uint32_t master_clock, uint32_t clock_div, uint32_t samples_frame, uint32_t lowpass_cutoff)
14 { 14 {
15 memset(context, 0, sizeof(*context)); 15 memset(context, 0, sizeof(*context));
16 context->audio_buffer = malloc(sizeof(*context->audio_buffer) * samples_frame); 16 context->audio = render_audio_source(1);
17 context->back_buffer = malloc(sizeof(*context->audio_buffer) * samples_frame); 17 context->audio_buffer = render_audio_source_buffer(context->audio);
18 context->clock_inc = clock_div; 18 context->clock_inc = clock_div;
19 context->sample_rate = sample_rate; 19 context->sample_rate = sample_rate;
20 context->samples_frame = samples_frame; 20 context->samples_frame = samples_frame;
21 double rc = (1.0 / (double)lowpass_cutoff) / (2.0 * M_PI); 21 double rc = (1.0 / (double)lowpass_cutoff) / (2.0 * M_PI);
22 double dt = 1.0 / ((double)master_clock / (double)clock_div); 22 double dt = 1.0 / ((double)master_clock / (double)clock_div);
28 } 28 }
29 } 29 }
30 30
31 void psg_free(psg_context *context) 31 void psg_free(psg_context *context)
32 { 32 {
33 free(context->audio_buffer); 33 render_free_source(context->audio);
34 //TODO: Figure out how to make this 100% safe
35 //audio thread could still be using this
36 free(context->back_buffer);
37 free(context); 34 free(context);
38 } 35 }
39 36
40 #define BUFFER_INC_RES 0x40000000UL 37 #define BUFFER_INC_RES 0x40000000UL
41 38
141 tmp += context->accum * (0x10000 - ((context->buffer_fraction << 16) / context->buffer_inc)); 138 tmp += context->accum * (0x10000 - ((context->buffer_fraction << 16) / context->buffer_inc));
142 context->audio_buffer[context->buffer_pos++] = tmp >> 16; 139 context->audio_buffer[context->buffer_pos++] = tmp >> 16;
143 140
144 if (context->buffer_pos == context->samples_frame) { 141 if (context->buffer_pos == context->samples_frame) {
145 if (!headless) { 142 if (!headless) {
146 render_wait_psg(context); 143 context->audio_buffer = render_audio_ready(context->audio);
144 context->buffer_pos = 0;
147 } 145 }
148 } 146 }
149 } 147 }
150 context->cycles += context->clock_inc; 148 context->cycles += context->clock_inc;
151 } 149 }