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README: fix synopsis example

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Andrew Kelley 2015-08-04 22:04:40 -07:00
parent c381526205
commit a6c5f99b27
1 changed files with 15 additions and 12 deletions
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27
README.md
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@ -75,23 +75,25 @@ static void panic(const char *format, ...) {
static const float PI = 3.1415926535f; static const float PI = 3.1415926535f;
static float seconds_offset = 0.0f; static float seconds_offset = 0.0f;
static void write_callback(struct SoundIoOutStream *outstream, int requested_frame_count) { 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 float_sample_rate = outstream->sample_rate;
float seconds_per_frame = 1.0f / float_sample_rate; float seconds_per_frame = 1.0f / float_sample_rate;
struct SoundIoChannelArea *areas;
int frames_left = frame_count_max;
int err; int err;
for (;;) { while (frames_left > 0) {
int frame_count = requested_frame_count; int frame_count = frames_left;
struct SoundIoChannelArea *areas;
if ((err = soundio_outstream_begin_write(outstream, &areas, &frame_count))) if ((err = soundio_outstream_begin_write(outstream, &areas, &frame_count)))
panic("%s", soundio_strerror(err)); panic("%s", soundio_strerror(err));
if (!frame_count) if (!frame_count)
break; break;
const struct SoundIoChannelLayout *layout = &outstream->layout;
float pitch = 440.0f; float pitch = 440.0f;
float radians_per_second = pitch * 2.0f * PI; float radians_per_second = pitch * 2.0f * PI;
for (int frame = 0; frame < frame_count; frame += 1) { for (int frame = 0; frame < frame_count; frame += 1) {
@ -103,16 +105,15 @@ static void write_callback(struct SoundIoOutStream *outstream, int requested_fra
} }
seconds_offset += seconds_per_frame * frame_count; seconds_offset += seconds_per_frame * frame_count;
if ((err = soundio_outstream_end_write(outstream, frame_count))) if ((err = soundio_outstream_end_write(outstream)))
panic("%s", soundio_strerror(err)); panic("%s", soundio_strerror(err));
requested_frame_count -= frame_count; frames_left -= frame_count;
if (requested_frame_count <= 0)
break;
} }
} }
int main(int argc, char **argv) { int main(int argc, char **argv) {
int err;
struct SoundIo *soundio = soundio_create(); struct SoundIo *soundio = soundio_create();
if (!soundio) if (!soundio)
panic("out of memory"); panic("out of memory");
@ -120,7 +121,9 @@ int main(int argc, char **argv) {
if ((err = soundio_connect(soundio))) if ((err = soundio_connect(soundio)))
panic("error connecting: %s", soundio_strerror(err)); panic("error connecting: %s", soundio_strerror(err));
int default_out_device_index = soundio_get_default_output_device_index(soundio); soundio_flush_events(soundio);
int default_out_device_index = soundio_default_output_device_index(soundio);
if (default_out_device_index < 0) if (default_out_device_index < 0)
panic("no output device found"); panic("no output device found");
@ -128,7 +131,7 @@ int main(int argc, char **argv) {
if (!device) if (!device)
panic("out of memory"); panic("out of memory");
fprintf(stderr, "Output device: %s: %s\n", device->name, device->description); fprintf(stderr, "Output device: %s\n", device->name);
struct SoundIoOutStream *outstream = soundio_outstream_create(device); struct SoundIoOutStream *outstream = soundio_outstream_create(device);
outstream->format = SoundIoFormatFloat32NE; outstream->format = SoundIoFormatFloat32NE;