mirror of
https://github.com/bluekitchen/btstack.git
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99 lines
3.9 KiB
C
99 lines
3.9 KiB
C
/*
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* Copyright (C) 2014 BlueKitchen GmbH
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holders nor the names of
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* 4. Any redistribution, use, or modification is done solely for
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* personal benefit and not for any commercial purpose or for
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* monetary gain.
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*
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* THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN
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* GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Please inquire about commercial licensing options at
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* contact@bluekitchen-gmbh.com
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*
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*/
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#define BTSTACK_FILE__ "sine_player.c"
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/* EXAMPLE_START(audio_duplex): Audio Driver - Play Sine
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*
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* @text Play sine to test and validate audio output with simple wave form.
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*/
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#include "btstack.h"
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#include <stdio.h>
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#define TABLE_SIZE_441HZ 100
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// change to 1 for mono output
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#define NUM_CHANNELS 2
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static int sine_phase;
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static const int16_t sine_int16[] = {
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0, 2057, 4107, 6140, 8149, 10126, 12062, 13952, 15786, 17557,
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19260, 20886, 22431, 23886, 25247, 26509, 27666, 28714, 29648, 30466,
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31163, 31738, 32187, 32509, 32702, 32767, 32702, 32509, 32187, 31738,
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31163, 30466, 29648, 28714, 27666, 26509, 25247, 23886, 22431, 20886,
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19260, 17557, 15786, 13952, 12062, 10126, 8149, 6140, 4107, 2057,
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0, -2057, -4107, -6140, -8149, -10126, -12062, -13952, -15786, -17557,
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-19260, -20886, -22431, -23886, -25247, -26509, -27666, -28714, -29648, -30466,
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-31163, -31738, -32187, -32509, -32702, -32767, -32702, -32509, -32187, -31738,
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-31163, -30466, -29648, -28714, -27666, -26509, -25247, -23886, -22431, -20886,
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-19260, -17557, -15786, -13952, -12062, -10126, -8149, -6140, -4107, -2057,
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};
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static void audio_playback(int16_t * pcm_buffer, uint16_t num_samples_to_write){
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int count;
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for (count = 0; count < num_samples_to_write ; count++){
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unsigned int channel;
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for (channel = 0; channel < NUM_CHANNELS ; channel++){
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pcm_buffer[count * NUM_CHANNELS + channel] = sine_int16[sine_phase];
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}
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sine_phase++;
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if (sine_phase >= TABLE_SIZE_441HZ){
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sine_phase -= TABLE_SIZE_441HZ;
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}
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}
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}
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int btstack_main(int argc, const char * argv[]);
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int btstack_main(int argc, const char * argv[]){
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(void)argc;
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(void)argv;
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// setup audio playback
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const btstack_audio_sink_t * audio = btstack_audio_sink_get_instance();
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if (!audio){
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printf("BTstack Audio Sink not setup\n");
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return 10;
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}
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audio->init(NUM_CHANNELS, 44100, &audio_playback);
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audio->start_stream();
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return 0;
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}
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/* EXAMPLE_END */ |