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OFF CACHE BOOL "") set(BUILD_DYNAMIC_LIBS ON CACHE BOOL "" FORCE) set(BUILD_STATIC_LIBS ON CACHE BOOL "" FORCE) +# libsoundio add_subdirectory("${CMAKE_SOURCE_DIR}/extern/libsoundio") target_include_directories(${PROJECT_NAME} PRIVATE "${CMAKE_SOURCE_DIR}/extern/libsoundio") @@ -27,3 +28,6 @@ target_link_libraries(${PROJECT_NAME} PRIVATE $<$:libsoundio_shared> $<$:libsoundio_static> ) + +# math +target_link_libraries(${PROJECT_NAME} PRIVATE m) diff --git a/src/main.c b/src/main.c index 92934a8..b6f6f44 100644 --- a/src/main.c +++ b/src/main.c @@ -1,8 +1,108 @@ +#include + #include +#include +#include +#include -int -main(int argc, char *argv[]) { - printf("Hello, %s\n", argv[0]); +static const float PI = 3.1415926535f; +static float seconds_offset = 0.0f; +static void write_callback(struct SoundIoOutStream *outstream, + int frame_count_min, int frame_count_max) +{ + const struct SoundIoChannelLayout *layout = &outstream->layout; + float float_sample_rate = outstream->sample_rate; + float seconds_per_frame = 1.0f / float_sample_rate; + struct SoundIoChannelArea *areas; + int frames_left = frame_count_max; + int err; + while (frames_left > 0) { + int frame_count = frames_left; + + if ((err = soundio_outstream_begin_write(outstream, &areas, &frame_count))) { + fprintf(stderr, "%s\n", soundio_strerror(err)); + exit(1); + } + + if (!frame_count) + break; + + float pitch = 440.0f; + float radians_per_second = pitch * 2.0f * PI; + for (int frame = 0; frame < frame_count; frame += 1) { + float sample = sin((seconds_offset + frame * seconds_per_frame) * radians_per_second); + for (int channel = 0; channel < layout->channel_count; channel += 1) { + float *ptr = (float*)(areas[channel].ptr + areas[channel].step * frame); + *ptr = sample; + } + } + seconds_offset = fmod(seconds_offset + seconds_per_frame * frame_count, 1.0); + + if ((err = soundio_outstream_end_write(outstream))) { + fprintf(stderr, "%s\n", soundio_strerror(err)); + exit(1); + } + + frames_left -= frame_count; + } +} + +int main(int argc, char **argv) { + int err; + struct SoundIo *soundio = soundio_create(); + if (!soundio) { + fprintf(stderr, "out of memory\n"); + return 1; + } + + if ((err = soundio_connect(soundio))) { + fprintf(stderr, "error connecting: %s\n", soundio_strerror(err)); + return 1; + } + + soundio_flush_events(soundio); + + int default_out_device_index = soundio_default_output_device_index(soundio); + if (default_out_device_index < 0) { + fprintf(stderr, "no output device found\n"); + return 1; + } + + struct SoundIoDevice *device = soundio_get_output_device(soundio, default_out_device_index); + if (!device) { + fprintf(stderr, "out of memory\n"); + return 1; + } + + fprintf(stderr, "Output device: %s\n", device->name); + + struct SoundIoOutStream *outstream = soundio_outstream_create(device); + if (!outstream) { + fprintf(stderr, "out of memory\n"); + return 1; + } + outstream->format = SoundIoFormatFloat32NE; + outstream->write_callback = write_callback; + + if ((err = soundio_outstream_open(outstream))) { + fprintf(stderr, "unable to open device: %s", soundio_strerror(err)); + return 1; + } + + if (outstream->layout_error) + fprintf(stderr, "unable to set channel layout: %s\n", soundio_strerror(outstream->layout_error)); + + if ((err = soundio_outstream_start(outstream))) { + fprintf(stderr, "unable to start device: %s\n", soundio_strerror(err)); + return 1; + } + + for (;;) + soundio_wait_events(soundio); + + soundio_outstream_destroy(outstream); + soundio_device_unref(device); + soundio_destroy(soundio); return 0; }