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https://github.com/n64dev/cen64.git
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5f5a0005a6
This is sloppy patchwork, but it's better sloppy patchwork than the previous sloppy patchwork! Will need to resample the audio and work with flucutations in subframe timing to solve the rest of the popping.
99 lines
2.8 KiB
C
99 lines
2.8 KiB
C
//
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// ai/context.c: Sound card context management.
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//
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// CEN64: Cycle-Accurate Nintendo 64 Emulator.
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// Copyright (C) 2015, Tyler J. Stachecki.
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//
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// This file is subject to the terms and conditions defined in
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// 'LICENSE', which is part of this source code package.
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//
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#include "common.h"
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#include "ai/context.h"
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// Creates and initializes an audio context.
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int ai_context_create(struct cen64_ai_context *context) {
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uint8_t buf[8];
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unsigned i;
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context->cur_frequency = 31985;
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if ((context->dev = alcOpenDevice(NULL)) == NULL) {
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printf("Failed to open the OpenAL device.\n");
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return 1;
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}
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if ((context->ctx = alcCreateContext(context->dev, NULL)) == NULL) {
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printf("Failed to create an OpenAL context.\n");
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alcCloseDevice(context->dev);
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return 1;
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}
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alcMakeContextCurrent(context->ctx);
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// Context/device is setup, create some buffers and a source.
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alGenBuffers(sizeof(context->buffers) / sizeof(*context->buffers),
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context->buffers);
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if (alGetError() != AL_NO_ERROR) {
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alcMakeContextCurrent(NULL);
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alcDestroyContext(context->ctx);
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alcCloseDevice(context->dev);
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}
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alGenSources(1, &context->source);
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if (alGetError() != AL_NO_ERROR) {
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alDeleteBuffers(sizeof(context->buffers) / sizeof(*context->buffers),
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context->buffers);
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alcMakeContextCurrent(NULL);
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alcDestroyContext(context->ctx);
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alcCloseDevice(context->dev);
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}
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// Queue/prime buffers, clear them to prevent pops.
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// Playing a little test also allows us to verify
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// that we (probably) won't get weird OpenAL errors
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// later on if things work now.
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memset(buf, 0x0, sizeof(buf));
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for (i = 0; i < sizeof(context->buffers) / sizeof(*context->buffers); i++)
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alBufferData(context->buffers[i], AL_FORMAT_STEREO16,
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buf, sizeof(buf), context->cur_frequency);
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context->unqueued_buffers = sizeof(context->buffers) /
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sizeof(*context->buffers);
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return 0;
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}
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// Destroys audio contexts made with ai_context_create.
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void ai_context_destroy(struct cen64_ai_context *context) {
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alDeleteSources(1, &context->source);
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alDeleteBuffers(sizeof(context->buffers) / sizeof(*context->buffers),
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context->buffers);
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alcMakeContextCurrent(NULL);
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alcDestroyContext(context->ctx);
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alcCloseDevice(context->dev);
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}
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// Generate buffers for some given frequency.
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int ai_switch_frequency(struct cen64_ai_context *context, ALint frequency) {
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alDeleteSources(1, &context->source);
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alDeleteBuffers(sizeof(context->buffers) / sizeof(*context->buffers),
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context->buffers);
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alGenBuffers(sizeof(context->buffers) / sizeof(*context->buffers),
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context->buffers);
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alGenSources(1, &context->source);
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context->cur_frequency = frequency;
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context->unqueued_buffers = sizeof(context->buffers) /
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sizeof(*context->buffers);
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return 0;
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}
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