Mercurial > repos > blastem

comparison psg.c @ 1356:4d16c09210fd

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Fix resampling code to deal with case in which output frequency is greater than the input frequency. Probably could stand to be improved, but at least it doesn't cause the emulator to deadlock
author Michael Pavone <pavone@retrodev.com>
date Thu, 11 May 2017 07:51:28 -0700
parents c15896605bf2
children 4e5797b3935a
comparison
equal deleted inserted replaced
1355:03cb4dd2499f 1356:4d16c09210fd
133 } 133 }
134 int32_t tmp = context->accum * context->lowpass_alpha + context->last_sample * (0x10000 - context->lowpass_alpha); 134 int32_t tmp = context->accum * context->lowpass_alpha + context->last_sample * (0x10000 - context->lowpass_alpha);
135 context->accum = tmp >> 16; 135 context->accum = tmp >> 16;
136 136
137 context->buffer_fraction += context->buffer_inc; 137 context->buffer_fraction += context->buffer_inc;
138 if (context->buffer_fraction >= BUFFER_INC_RES) { 138 while (context->buffer_fraction >= BUFFER_INC_RES) {
139 context->buffer_fraction -= BUFFER_INC_RES; 139 context->buffer_fraction -= BUFFER_INC_RES;
140 int32_t tmp = context->last_sample * ((context->buffer_fraction << 16) / context->buffer_inc); 140 int32_t tmp = context->last_sample * ((context->buffer_fraction << 16) / context->buffer_inc);
141 tmp += context->accum * (0x10000 - ((context->buffer_fraction << 16) / context->buffer_inc)); 141 tmp += context->accum * (0x10000 - ((context->buffer_fraction << 16) / context->buffer_inc));
142 context->audio_buffer[context->buffer_pos++] = tmp >> 16; 142 context->audio_buffer[context->buffer_pos++] = tmp >> 16;
143 143