circuitpython/shared-module/audiomixer/MixerVoice.c

/*
 * This file is part of the Micro Python project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2018 DeanM for Adafruit Industries
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#include "shared-bindings/audiomixer/Mixer.h"
#include "shared-module/audiomixer/MixerVoice.h"

#include <stdint.h>

#include "py/runtime.h"
#include "shared-module/audiomixer/__init__.h"
#include "shared-module/audiocore/RawSample.h"

void common_hal_audiomixer_mixervoice_construct(audiomixer_mixervoice_obj_t *self) {
    self->sample = NULL;
    self->level = 1 << 15;
}

void common_hal_audiomixer_mixervoice_set_parent(audiomixer_mixervoice_obj_t* self, audiomixer_mixer_obj_t *parent) {
	self->parent = parent;
}

float common_hal_audiomixer_mixervoice_get_level(audiomixer_mixervoice_obj_t* self) {
	return ((float) self->level / (1 << 15));
}

void common_hal_audiomixer_mixervoice_set_level(audiomixer_mixervoice_obj_t* self, float level) {
	self->level = level * (1 << 15);
}

void common_hal_audiomixer_mixervoice_play(audiomixer_mixervoice_obj_t* self, mp_obj_t sample, bool loop) {
    if (audiosample_sample_rate(sample) != self->parent->sample_rate) {
        mp_raise_ValueError(translate("The sample's sample rate does not match the mixer's"));
    }
    if (audiosample_channel_count(sample) != self->parent->channel_count) {
        mp_raise_ValueError(translate("The sample's channel count does not match the mixer's"));
    }
    if (audiosample_bits_per_sample(sample) != self->parent->bits_per_sample) {
        mp_raise_ValueError(translate("The sample's bits_per_sample does not match the mixer's"));
    }
    bool single_buffer;
    bool samples_signed;
    uint32_t max_buffer_length;
    uint8_t spacing;
    audiosample_get_buffer_structure(sample, false, &single_buffer, &samples_signed,
                                     &max_buffer_length, &spacing);
    if (samples_signed != self->parent->samples_signed) {
        mp_raise_ValueError(translate("The sample's signedness does not match the mixer's"));
    }
    self->sample = sample;
    self->loop = loop;

    audiosample_reset_buffer(sample, false, 0);
    audioio_get_buffer_result_t result = audiosample_get_buffer(sample, false, 0, (uint8_t**) &self->remaining_buffer, &self->buffer_length);
    // Track length in terms of words.
    self->buffer_length /= sizeof(uint32_t);
    self->more_data = result == GET_BUFFER_MORE_DATA;
}

bool common_hal_audiomixer_mixervoice_get_playing(audiomixer_mixervoice_obj_t* self) {
	return self->sample != NULL;
}

void common_hal_audiomixer_mixervoice_stop(audiomixer_mixervoice_obj_t* self) {
    self->sample = NULL;
}