diff options
Diffstat (limited to 'src/mossrose.c')
-rw-r--r-- | src/mossrose.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/src/mossrose.c b/src/mossrose.c new file mode 100644 index 0000000..fdaa10c --- /dev/null +++ b/src/mossrose.c @@ -0,0 +1,70 @@ +#include <stdio.h> +#include <portaudio.h> +#include "mossrose.h" + + +PaStream *stream; + + +struct audio_output_t { + float l; + float r; +}; + + +static int callback( + const void *input, + void *output, + unsigned long frame_count, + const PaStreamCallbackTimeInfo *time_info, + void *userdata) +{ + static float left = 0; + static float right = 0; + + struct audio_output_t *out = output; + for (int i=0; i<frame_count; i++) { + out[i].l = left; + out[i].r = right; + left += 0.01; + right += 0.03; + if (left > 1) left -= 2; + if (right > 1) right -= 2; + } + return 0; +} + + +int mr_init(double sample_rate, int n_channels) +{ + PaError err; + + err = Pa_Initialize(); + if (err != paNoError) { + fprintf(stderr, "failed to initialize PortAudio!\n"); + return 1; + } + + err = Pa_OpenDefaultStream(&stream, 0, 2, paFloat32, sample_rate, 0, callback, NULL); + if (err != paNoError) { + fprintf(stderr, "failed to open audio stream!\n"); + return 1; + } + + err = Pa_StartStream(stream); + if (err != paNoError) { + fprintf(stderr, "failed to start audio stream!\n"); + return 1; + } + + return 0; +}; + + +int mr_terminate(double sample_rate, int n_channels) +{ + Pa_AbortStream(stream); + Pa_CloseStream(stream); + Pa_Terminate(); + return 0; +} |