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add and export a ring buffer implementation

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This commit is contained in:
Andrew Kelley 2015-07-06 01:05:22 -07:00
parent dc05a82c28
commit a69ff6025c
12 changed files with 499 additions and 150 deletions
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11
CMakeLists.txt
View file

@ -51,8 +51,8 @@ set(LIBSOUNDIO_SOURCES
"${CMAKE_SOURCE_DIR}/src/util.cpp"
"${CMAKE_SOURCE_DIR}/src/os.cpp"
"${CMAKE_SOURCE_DIR}/src/dummy.cpp"
"${CMAKE_SOURCE_DIR}/src/dummy_ring_buffer.cpp"
"${CMAKE_SOURCE_DIR}/src/channel_layout.cpp"
"${CMAKE_SOURCE_DIR}/src/ring_buffer.cpp"
)
set(CONFIGURE_OUT_FILE "${CMAKE_BINARY_DIR}/config.h")
@ -67,8 +67,8 @@ set(TEST_SOURCES
"${CMAKE_SOURCE_DIR}/src/os.cpp"
"${CMAKE_SOURCE_DIR}/src/soundio.cpp"
"${CMAKE_SOURCE_DIR}/src/dummy.cpp"
"${CMAKE_SOURCE_DIR}/src/dummy_ring_buffer.cpp"
"${CMAKE_SOURCE_DIR}/src/channel_layout.cpp"
"${CMAKE_SOURCE_DIR}/src/ring_buffer.cpp"
)
if(SOUNDIO_HAVE_PULSEAUDIO)
@ -152,6 +152,13 @@ set_target_properties(list_devices PROPERTIES
include_directories(${EXAMPLE_INCLUDES})
target_link_libraries(list_devices libsoundio_shared)
add_executable(microphone example/microphone.c)
set_target_properties(microphone PROPERTIES
LINKER_LANGUAGE C
COMPILE_FLAGS ${EXAMPLE_CFLAGS})
include_directories(${EXAMPLE_INCLUDES})
target_link_libraries(microphone libsoundio_shared)
enable_testing()

97
example/microphone.c Normal file
View file

@ -0,0 +1,97 @@
/*
* Copyright (c) 2015 Andrew Kelley
*
* This file is part of libsoundio, which is MIT licensed.
* See http://opensource.org/licenses/MIT
*/
#include <soundio.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
__attribute__ ((cold))
__attribute__ ((noreturn))
__attribute__ ((format (printf, 1, 2)))
static void panic(const char *format, ...) {
va_list ap;
va_start(ap, format);
vfprintf(stderr, format, ap);
fprintf(stderr, "\n");
va_end(ap);
abort();
}
static void read_callback(struct SoundIoInputDevice *input_device) {
fprintf(stderr, "read_callback\n");
}
static void write_callback(struct SoundIoOutputDevice *output_device, int requested_frame_count) {
fprintf(stderr, "write_callback\n");
}
static void underrun_callback(struct SoundIoOutputDevice *output_device) {
static int count = 0;
fprintf(stderr, "underrun %d\n", count++);
soundio_output_device_fill_with_silence(output_device);
}
int main(int argc, char **argv) {
struct SoundIo *soundio = soundio_create();
if (!soundio)
panic("out of memory");
int err;
if ((err = soundio_connect(soundio)))
panic("error connecting: %s", soundio_error_string(err));
int default_out_device_index = soundio_get_default_output_device_index(soundio);
if (default_out_device_index < 0)
panic("no output device found");
int default_in_device_index = soundio_get_default_output_device_index(soundio);
if (default_in_device_index < 0)
panic("no output device found");
struct SoundIoDevice *out_device = soundio_get_output_device(soundio, default_out_device_index);
if (!out_device)
panic("could not get output device: out of memory");
struct SoundIoDevice *in_device = soundio_get_input_device(soundio, default_in_device_index);
if (!in_device)
panic("could not get input device: out of memory");
fprintf(stderr, "Input device: %s: %s\n",
soundio_device_name(in_device),
soundio_device_description(in_device));
fprintf(stderr, "Output device: %s: %s\n",
soundio_device_name(out_device),
soundio_device_description(out_device));
struct SoundIoInputDevice *input_device;
soundio_input_device_create(in_device, SoundIoSampleFormatFloat, 0.1, NULL,
read_callback, &input_device);
struct SoundIoOutputDevice *output_device;
soundio_output_device_create(out_device, SoundIoSampleFormatFloat, 0.1, NULL,
write_callback, underrun_callback, &output_device);
if ((err = soundio_input_device_start(input_device)))
panic("unable to start input device: %s", soundio_error_string(err));
if ((err = soundio_output_device_start(output_device)))
panic("unable to start output device: %s", soundio_error_string(err));
for (;;)
soundio_wait_events(soundio);
soundio_output_device_destroy(output_device);
soundio_input_device_destroy(input_device);
soundio_device_unref(in_device);
soundio_device_unref(out_device);
soundio_destroy(soundio);
return 0;
}

5
src/atomics.hpp
View file

@ -3,10 +3,15 @@
#include <atomic>
using std::atomic_flag;
using std::atomic_int;
using std::atomic_long;
using std::atomic_bool;
using std::atomic_uintptr_t;
#if ATOMIC_INT_LOCK_FREE != 2
#error "require atomic_int to be lock free"
#endif
#if ATOMIC_LONG_LOCK_FREE != 2
#error "require atomic_long to be lock free"
#endif

20
src/dummy.cpp
View file

@ -7,9 +7,9 @@
#include "dummy.hpp"
#include "soundio.hpp"
#include "dummy_ring_buffer.hpp"
#include "os.hpp"
#include "atomics.hpp"
#include "ring_buffer.hpp"
#include <stdio.h>
#include <string.h>
@ -20,7 +20,7 @@ struct SoundIoOutputDeviceDummy {
atomic_flag abort_flag;
int buffer_size;
double period;
struct SoundIoDummyRingBuffer ring_buffer;
struct SoundIoRingBuffer ring_buffer;
};
struct SoundIoInputDeviceDummy {
@ -49,12 +49,12 @@ static void playback_thread_run(void *arg) {
double total_time = now - start_time;
long total_frames = total_time / time_per_frame;
int frames_to_kill = total_frames - frames_consumed;
int fill_count = soundio_dummy_ring_buffer_fill_count(&opd->ring_buffer);
int fill_count = soundio_ring_buffer_fill_count(&opd->ring_buffer);
int frames_in_buffer = fill_count / output_device->bytes_per_frame;
int read_count = min(frames_to_kill, frames_in_buffer);
int frames_left = frames_to_kill - read_count;
int byte_count = read_count * output_device->bytes_per_frame;
soundio_dummy_ring_buffer_advance_read_ptr(&opd->ring_buffer, byte_count);
soundio_ring_buffer_advance_read_ptr(&opd->ring_buffer, byte_count);
frames_consumed += read_count;
if (frames_left > 0) {
@ -128,7 +128,7 @@ static void output_device_destroy_dummy(SoundIo *soundio,
soundio_os_cond_destroy(opd->cond);
opd->cond = nullptr;
soundio_dummy_ring_buffer_deinit(&opd->ring_buffer);
soundio_ring_buffer_deinit(&opd->ring_buffer);
destroy(opd);
output_device->backend_data = nullptr;
@ -150,7 +150,7 @@ static int output_device_init_dummy(SoundIo *soundio,
opd->buffer_size = output_device->bytes_per_frame * buffer_frame_count;
opd->period = output_device->latency * 0.5;
soundio_dummy_ring_buffer_init(&opd->ring_buffer, opd->buffer_size);
soundio_ring_buffer_init(&opd->ring_buffer, opd->buffer_size);
opd->cond = soundio_os_cond_create();
if (!opd->cond) {
@ -167,7 +167,7 @@ static int output_device_start_dummy(SoundIo *soundio,
SoundIoOutputDeviceDummy *opd = (SoundIoOutputDeviceDummy *)output_device->backend_data;
soundio_output_device_fill_with_silence(output_device);
assert(soundio_dummy_ring_buffer_fill_count(&opd->ring_buffer) == opd->buffer_size);
assert(soundio_ring_buffer_fill_count(&opd->ring_buffer) == opd->buffer_size);
opd->abort_flag.test_and_set();
int err;
@ -182,7 +182,7 @@ static int output_device_free_count_dummy(SoundIo *soundio,
SoundIoOutputDevice *output_device)
{
SoundIoOutputDeviceDummy *opd = (SoundIoOutputDeviceDummy *)output_device->backend_data;
int fill_count = soundio_dummy_ring_buffer_fill_count(&opd->ring_buffer);
int fill_count = soundio_ring_buffer_fill_count(&opd->ring_buffer);
int bytes_free_count = opd->buffer_size - fill_count;
return bytes_free_count / output_device->bytes_per_frame;
}
@ -203,14 +203,14 @@ static void output_device_write_dummy(SoundIo *soundio,
SoundIoOutputDeviceDummy *opd = (SoundIoOutputDeviceDummy *)output_device->backend_data;
assert(data == opd->ring_buffer.address);
int byte_count = frame_count * output_device->bytes_per_frame;
soundio_dummy_ring_buffer_advance_write_ptr(&opd->ring_buffer, byte_count);
soundio_ring_buffer_advance_write_ptr(&opd->ring_buffer, byte_count);
}
static void output_device_clear_buffer_dummy(SoundIo *soundio,
SoundIoOutputDevice *output_device)
{
SoundIoOutputDeviceDummy *opd = (SoundIoOutputDeviceDummy *)output_device->backend_data;
soundio_dummy_ring_buffer_clear(&opd->ring_buffer);
soundio_ring_buffer_clear(&opd->ring_buffer);
}
static int input_device_init_dummy(SoundIo *soundio,

75
src/dummy_ring_buffer.cpp
View file

@ -1,75 +0,0 @@
#include "dummy_ring_buffer.hpp"
#include "soundio.hpp"
#include <math.h>
int soundio_dummy_ring_buffer_create(int requested_capacity, struct SoundIoDummyRingBuffer **out) {
*out = nullptr;
SoundIoDummyRingBuffer *rb = create<SoundIoDummyRingBuffer>();
if (!rb) {
soundio_dummy_ring_buffer_destroy(rb);
return SoundIoErrorNoMem;
}
int err;
if ((err = soundio_dummy_ring_buffer_init(rb, requested_capacity))) {
soundio_dummy_ring_buffer_destroy(rb);
return SoundIoErrorNoMem;
}
*out = rb;
return 0;
}
int soundio_dummy_ring_buffer_init(struct SoundIoDummyRingBuffer *rb, int requested_capacity) {
// round size up to the nearest power of two
rb->capacity = powf(2, ceilf(log2(requested_capacity)));
rb->address = allocate_nonzero<char>(rb->capacity);
if (!rb->address) {
soundio_dummy_ring_buffer_deinit(rb);
return SoundIoErrorNoMem;
}
return 0;
}
void soundio_dummy_ring_buffer_destroy(struct SoundIoDummyRingBuffer *rb) {
if (!rb)
return;
soundio_dummy_ring_buffer_deinit(rb);
destroy(rb);
}
void soundio_dummy_ring_buffer_deinit(struct SoundIoDummyRingBuffer *rb) {
deallocate(rb->address, rb->capacity);
rb->address = nullptr;
}
void soundio_dummy_ring_buffer_clear(struct SoundIoDummyRingBuffer *rb) {
rb->write_offset.store(rb->read_offset.load());
}
int soundio_dummy_ring_buffer_free_count(struct SoundIoDummyRingBuffer *rb) {
return rb->capacity - soundio_dummy_ring_buffer_fill_count(rb);
}
int soundio_dummy_ring_buffer_fill_count(struct SoundIoDummyRingBuffer *rb) {
int count = rb->write_offset - rb->read_offset;
assert(count >= 0);
assert(count <= rb->capacity);
return count;
}
void soundio_dummy_ring_buffer_advance_write_ptr(struct SoundIoDummyRingBuffer *rb, int count) {
rb->write_offset += count;
assert(soundio_dummy_ring_buffer_fill_count(rb) >= 0);
}
void soundio_dummy_ring_buffer_advance_read_ptr(struct SoundIoDummyRingBuffer *rb, int count) {
rb->read_offset += count;
assert(soundio_dummy_ring_buffer_fill_count(rb) >= 0);
}

33
src/dummy_ring_buffer.hpp
View file

@ -1,33 +0,0 @@
#ifndef SOUNDIO_DUMMY_RING_BUFFER_HPP
#define SOUNDIO_DUMMY_RING_BUFFER_HPP
#include "util.hpp"
#include "atomics.hpp"
struct SoundIoDummyRingBuffer {
char *address;
long capacity;
atomic_long write_offset;
atomic_long read_offset;
};
int soundio_dummy_ring_buffer_create(int requested_capacity, struct SoundIoDummyRingBuffer **out);
void soundio_dummy_ring_buffer_destroy(struct SoundIoDummyRingBuffer *rb);
int soundio_dummy_ring_buffer_init(struct SoundIoDummyRingBuffer *rb, int requested_capacity);
void soundio_dummy_ring_buffer_deinit(struct SoundIoDummyRingBuffer *rb);
// must be called by the writer
void soundio_dummy_ring_buffer_clear(struct SoundIoDummyRingBuffer *rb);
// how much is available, ready for writing
int soundio_dummy_ring_buffer_free_count(struct SoundIoDummyRingBuffer *rb);
// how much of the buffer is used, ready for reading
int soundio_dummy_ring_buffer_fill_count(struct SoundIoDummyRingBuffer *rb);
void soundio_dummy_ring_buffer_advance_write_ptr(struct SoundIoDummyRingBuffer *rb, int count);
void soundio_dummy_ring_buffer_advance_read_ptr(struct SoundIoDummyRingBuffer *rb, int count);
#endif

55
src/pulseaudio.cpp
View file

@ -720,7 +720,8 @@ static void recording_stream_state_callback(pa_stream *stream, void *userdata) {
ord->stream_ready = true;
break;
case PA_STREAM_FAILED:
soundio_panic("pulseaudio stream error: %s", pa_strerror(pa_context_errno(pa_stream_get_context(stream))));
soundio_panic("pulseaudio stream error: %s",
pa_strerror(pa_context_errno(pa_stream_get_context(stream))));
break;
}
}
@ -730,10 +731,39 @@ static void recording_stream_read_callback(pa_stream *stream, size_t nbytes, voi
input_device->read_callback(input_device);
}
static int input_device_init_pa(SoundIo *soundio,
static void input_device_destroy_pa(SoundIo *soundio,
SoundIoInputDevice *input_device)
{
SoundIoInputDevicePulseAudio *ord = (SoundIoInputDevicePulseAudio *)input_device->backend_data;
if (!ord)
return;
SoundIoPulseAudio *sipa = (SoundIoPulseAudio *)soundio->backend_data;
pa_stream *stream = ord->stream;
if (stream) {
pa_threaded_mainloop_lock(sipa->main_loop);
pa_stream_set_state_callback(stream, nullptr, nullptr);
pa_stream_set_read_callback(stream, nullptr, nullptr);
pa_stream_disconnect(stream);
pa_stream_unref(stream);
pa_threaded_mainloop_unlock(sipa->main_loop);
ord->stream = nullptr;
}
}
static int input_device_init_pa(SoundIo *soundio,
SoundIoInputDevice *input_device)
{
SoundIoInputDevicePulseAudio *ord = create<SoundIoInputDevicePulseAudio>();
if (!ord) {
input_device_destroy_pa(soundio, input_device);
return SoundIoErrorNoMem;
}
input_device->backend_data = ord;
SoundIoPulseAudio *sipa = (SoundIoPulseAudio *)soundio->backend_data;
SoundIoDevice *device = input_device->device;
ord->stream_ready = false;
@ -750,6 +780,7 @@ static int input_device_init_pa(SoundIo *soundio,
ord->stream = pa_stream_new(sipa->pulse_context, "SoundIo", &sample_spec, &channel_map);
if (!input_device) {
pa_threaded_mainloop_unlock(sipa->main_loop);
input_device_destroy_pa(soundio, input_device);
return SoundIoErrorNoMem;
}
@ -773,26 +804,6 @@ static int input_device_init_pa(SoundIo *soundio,
return 0;
}
static void input_device_destroy_pa(SoundIo *soundio,
SoundIoInputDevice *input_device)
{
SoundIoInputDevicePulseAudio *ord = (SoundIoInputDevicePulseAudio *)input_device->backend_data;
SoundIoPulseAudio *sipa = (SoundIoPulseAudio *)soundio->backend_data;
pa_stream *stream = ord->stream;
if (stream) {
pa_threaded_mainloop_lock(sipa->main_loop);
pa_stream_set_state_callback(stream, nullptr, nullptr);
pa_stream_set_read_callback(stream, nullptr, nullptr);
pa_stream_disconnect(stream);
pa_stream_unref(stream);
pa_threaded_mainloop_unlock(sipa->main_loop);
ord->stream = nullptr;
}
}
static int input_device_start_pa(SoundIo *soundio,
SoundIoInputDevice *input_device)
{

125
src/ring_buffer.cpp Normal file
View file

@ -0,0 +1,125 @@
/*
* Copyright (c) 2015 Andrew Kelley
*
* This file is part of libsoundio, which is MIT licensed.
* See http://opensource.org/licenses/MIT
*/
#include "ring_buffer.hpp"
#include "soundio.hpp"
#include "util.hpp"
#include <sys/mman.h>
#include <stdlib.h>
#include <unistd.h>
#include <math.h>
#include <string.h>
#include <errno.h>
struct SoundIoRingBuffer *soundio_ring_buffer_create(struct SoundIo *soundio, int requested_capacity) {
SoundIoRingBuffer *rb = create<SoundIoRingBuffer>();
if (!rb) {
soundio_ring_buffer_destroy(rb);
return nullptr;
}
if (soundio_ring_buffer_init(rb, requested_capacity)) {
soundio_ring_buffer_destroy(rb);
return nullptr;
}
return rb;
}
void soundio_ring_buffer_destroy(struct SoundIoRingBuffer *rb) {
if (!rb)
return;
soundio_ring_buffer_deinit(rb);
destroy(rb);
}
int soundio_ring_buffer_capacity(struct SoundIoRingBuffer *rb) {
return rb->capacity;
}
char *soundio_ring_buffer_write_ptr(struct SoundIoRingBuffer *rb) {
return rb->address + (rb->write_offset % rb->capacity);
}
void soundio_ring_buffer_advance_write_ptr(struct SoundIoRingBuffer *rb, int count) {
rb->write_offset += count;
assert(soundio_ring_buffer_fill_count(rb) >= 0);
}
char *soundio_ring_buffer_read_ptr(struct SoundIoRingBuffer *rb) {
return rb->address + (rb->read_offset % rb->capacity);
}
void soundio_ring_buffer_advance_read_ptr(struct SoundIoRingBuffer *rb, int count) {
rb->read_offset += count;
assert(soundio_ring_buffer_fill_count(rb) >= 0);
}
int soundio_ring_buffer_fill_count(struct SoundIoRingBuffer *rb) {
int count = rb->write_offset - rb->read_offset;
assert(count >= 0);
assert(count <= rb->capacity);
return count;
}
int soundio_ring_buffer_free_count(struct SoundIoRingBuffer *rb) {
return rb->capacity - soundio_ring_buffer_fill_count(rb);
}
void soundio_ring_buffer_clear(struct SoundIoRingBuffer *rb) {
return rb->write_offset.store(rb->read_offset.load());
}
int soundio_ring_buffer_init(struct SoundIoRingBuffer *rb, int requested_capacity) {
// round size up to the nearest power of two
int pow2_size = powf(2, ceilf(log2(requested_capacity)));
// at minimum must be page size
int page_size = getpagesize();
rb->capacity = max(pow2_size, page_size);
rb->write_offset = 0;
rb->read_offset = 0;
char shm_path[] = "/dev/shm/ring-buffer-XXXXXX";
int fd = mkstemp(shm_path);
if (fd < 0)
return SoundIoErrorSystemResources;
if (unlink(shm_path))
return SoundIoErrorSystemResources;
if (ftruncate(fd, rb->capacity))
return SoundIoErrorNoMem;
rb->address = (char*)mmap(NULL, rb->capacity * 2, PROT_NONE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
if (rb->address == MAP_FAILED)
return SoundIoErrorNoMem;
char *other_address = (char*)mmap(rb->address, rb->capacity,
PROT_READ|PROT_WRITE, MAP_FIXED|MAP_SHARED, fd, 0);
if (other_address != rb->address)
return SoundIoErrorNoMem;
other_address = (char*)mmap(rb->address + rb->capacity, rb->capacity,
PROT_READ|PROT_WRITE, MAP_FIXED|MAP_SHARED, fd, 0);
if (other_address != rb->address + rb->capacity)
return SoundIoErrorNoMem;
if (close(fd))
return SoundIoErrorSystemResources;
return 0;
}
void soundio_ring_buffer_deinit(struct SoundIoRingBuffer *rb) {
if (munmap(rb->address, 2 * rb->capacity))
soundio_panic("munmap failed: %s", strerror(errno));
}

23
src/ring_buffer.hpp Normal file
View file

@ -0,0 +1,23 @@
/*
* Copyright (c) 2015 Andrew Kelley
*
* This file is part of libsoundio, which is MIT licensed.
* See http://opensource.org/licenses/MIT
*/
#ifndef SOUNDIO_RING_BUFFER_HPP
#define SOUNDIO_RING_BUFFER_HPP
#include "atomics.hpp"
struct SoundIoRingBuffer {
char *address;
long capacity;
atomic_long write_offset;
atomic_long read_offset;
};
int soundio_ring_buffer_init(struct SoundIoRingBuffer *rb, int requested_capacity);
void soundio_ring_buffer_deinit(struct SoundIoRingBuffer *rb);
#endif

51
src/soundio.cpp
View file

@ -336,3 +336,54 @@ int soundio_output_device_start(struct SoundIoOutputDevice *output_device) {
SoundIo *soundio = output_device->device->soundio;
return soundio->output_device_start(soundio, output_device);
}
int soundio_input_device_create(struct SoundIoDevice *device,
enum SoundIoSampleFormat sample_format, double latency, void *userdata,
void (*read_callback)(struct SoundIoInputDevice *),
struct SoundIoInputDevice **out_input_device)
{
*out_input_device = nullptr;
SoundIoInputDevice *sid = create<SoundIoInputDevice>();
if (!sid) {
soundio_input_device_destroy(sid);
return SoundIoErrorNoMem;
}
soundio_device_ref(device);
sid->device = device;
sid->userdata = userdata;
sid->read_callback = read_callback;
sid->sample_format = sample_format;
sid->latency = latency;
sid->bytes_per_frame = soundio_get_bytes_per_frame(sample_format,
device->channel_layout.channel_count);
SoundIo *soundio = device->soundio;
int err = soundio->input_device_init(soundio, sid);
if (err) {
soundio_input_device_destroy(sid);
return err;
}
*out_input_device = sid;
return 0;
}
int soundio_input_device_start(struct SoundIoInputDevice *input_device) {
SoundIo *soundio = input_device->device->soundio;
return soundio->input_device_start(soundio, input_device);
}
void soundio_input_device_destroy(struct SoundIoInputDevice *input_device) {
if (!input_device)
return;
SoundIo *soundio = input_device->device->soundio;
if (soundio->input_device_destroy)
soundio->input_device_destroy(soundio, input_device);
soundio_device_unref(input_device->device);
destroy(input_device);
}

39
src/soundio.h
View file

@ -309,16 +309,41 @@ void soundio_output_device_clear_buffer(struct SoundIoOutputDevice *output_devic
int soundio_input_device_create(struct SoundIoDevice *device,
enum SoundIoSampleFormat sample_format, double latency, void *userdata,
void (*read_callback)(struct SoundIoOutputDevice *),
struct SoundIoOutputDevice **out_input_device);
void soundio_input_device_destroy(struct SoundIoOutputDevice *input_device);
void (*read_callback)(struct SoundIoInputDevice *),
struct SoundIoInputDevice **out_input_device);
void soundio_input_device_destroy(struct SoundIoInputDevice *input_device);
int soundio_input_device_start(struct SoundIoOutputDevice *input_device);
void soundio_input_device_peek(struct SoundIoOutputDevice *input_device,
int soundio_input_device_start(struct SoundIoInputDevice *input_device);
void soundio_input_device_peek(struct SoundIoInputDevice *input_device,
const char **data, int *frame_count);
void soundio_input_device_drop(struct SoundIoOutputDevice *input_device);
void soundio_input_device_drop(struct SoundIoInputDevice *input_device);
void soundio_input_device_clear_buffer(struct SoundIoInputDevice *input_device);
// Ring Buffer
struct SoundIoRingBuffer;
struct SoundIoRingBuffer *soundio_ring_buffer_create(struct SoundIo *soundio, int requested_capacity);
void soundio_ring_buffer_destroy(struct SoundIoRingBuffer *ring_buffer);
int soundio_ring_buffer_capacity(struct SoundIoRingBuffer *ring_buffer);
// don't write more than capacity
char *soundio_ring_buffer_write_ptr(struct SoundIoRingBuffer *ring_buffer);
void soundio_ring_buffer_advance_write_ptr(struct SoundIoRingBuffer *ring_buffer, int count);
// don't read more than capacity
char *soundio_ring_buffer_read_ptr(struct SoundIoRingBuffer *ring_buffer);
void soundio_ring_buffer_advance_read_ptr(struct SoundIoRingBuffer *ring_buffer, int count);
// how much of the buffer is used, ready for reading
int soundio_ring_buffer_fill_count(struct SoundIoRingBuffer *ring_buffer);
// how much is available, ready for writing
int soundio_ring_buffer_free_count(struct SoundIoRingBuffer *ring_buffer);
// must be called by the writer
void soundio_ring_buffer_clear(struct SoundIoRingBuffer *ring_buffer);
void soundio_input_device_clear_buffer(struct SoundIoOutputDevice *input_device);
#ifdef __cplusplus
}

115
test/unit_tests.cpp
View file

@ -1,8 +1,9 @@
#undef NDEBUG
#include "soundio.h"
#include "soundio.hpp"
#include "os.hpp"
#include "util.hpp"
#include "atomics.hpp"
#include <stdio.h>
#include <string.h>
@ -43,6 +44,116 @@ static void test_create_output_device(void) {
soundio_destroy(soundio);
}
static void test_ring_buffer_basic(void) {
struct SoundIo *soundio = soundio_create();
assert(soundio);
SoundIoRingBuffer *rb = soundio_ring_buffer_create(soundio, 10);
assert(rb);
assert(soundio_ring_buffer_capacity(rb) == 4096);
char *write_ptr = soundio_ring_buffer_write_ptr(rb);
int amt = sprintf(write_ptr, "hello") + 1;
soundio_ring_buffer_advance_write_ptr(rb, amt);
assert(soundio_ring_buffer_fill_count(rb) == amt);
assert(soundio_ring_buffer_free_count(rb) == 4096 - amt);
char *read_ptr = soundio_ring_buffer_read_ptr(rb);
assert(strcmp(read_ptr, "hello") == 0);
soundio_ring_buffer_advance_read_ptr(rb, amt);
assert(soundio_ring_buffer_fill_count(rb) == 0);
assert(soundio_ring_buffer_free_count(rb) == soundio_ring_buffer_capacity(rb));
soundio_ring_buffer_advance_write_ptr(rb, 4094);
soundio_ring_buffer_advance_read_ptr(rb, 4094);
amt = sprintf(soundio_ring_buffer_write_ptr(rb), "writing past the end") + 1;
soundio_ring_buffer_advance_write_ptr(rb, amt);
assert(soundio_ring_buffer_fill_count(rb) == amt);
assert(strcmp(soundio_ring_buffer_read_ptr(rb), "writing past the end") == 0);
soundio_ring_buffer_advance_read_ptr(rb, amt);
assert(soundio_ring_buffer_fill_count(rb) == 0);
assert(soundio_ring_buffer_free_count(rb) == soundio_ring_buffer_capacity(rb));
soundio_ring_buffer_destroy(rb);
soundio_destroy(soundio);
}
static SoundIoRingBuffer *rb = nullptr;
static const int rb_size = 3528;
static long expected_write_head;
static long expected_read_head;
static atomic_bool rb_done;
static atomic_int rb_write_it;
static atomic_int rb_read_it;
// just for testing purposes; does not need to be high quality random
static double random_double(void) {
return ((double)rand() / (double)RAND_MAX);
}
static void reader_thread_run(void *) {
while (!rb_done) {
rb_read_it += 1;
int fill_count = soundio_ring_buffer_fill_count(rb);
assert(fill_count >= 0);
assert(fill_count <= rb_size);
int amount_to_read = min((int)(random_double() * 2.0 * fill_count), fill_count);
soundio_ring_buffer_advance_read_ptr(rb, amount_to_read);
expected_read_head += amount_to_read;
}
}
static void writer_thread_run(void *) {
while (!rb_done) {
rb_write_it += 1;
int fill_count = soundio_ring_buffer_fill_count(rb);
assert(fill_count >= 0);
assert(fill_count <= rb_size);
int free_count = rb_size - fill_count;
assert(free_count >= 0);
assert(free_count <= rb_size);
int value = min((int)(random_double() * 2.0 * free_count), free_count);
soundio_ring_buffer_advance_write_ptr(rb, value);
expected_write_head += value;
}
}
static void test_ring_buffer_threaded(void) {
struct SoundIo *soundio = soundio_create();
assert(soundio);
rb = soundio_ring_buffer_create(soundio, rb_size);
expected_write_head = 0;
expected_read_head = 0;
rb_read_it = 0;
rb_write_it = 0;
rb_done = false;
SoundIoOsThread *reader_thread;
ok_or_panic(soundio_os_thread_create(reader_thread_run, nullptr, false, &reader_thread));
SoundIoOsThread *writer_thread;
ok_or_panic(soundio_os_thread_create(writer_thread_run, nullptr, false, &writer_thread));
while (rb_read_it < 100000 || rb_write_it < 100000) {}
rb_done = true;
soundio_os_thread_destroy(reader_thread);
soundio_os_thread_destroy(writer_thread);
int fill_count = soundio_ring_buffer_fill_count(rb);
int expected_fill_count = expected_write_head - expected_read_head;
assert(fill_count == expected_fill_count);
soundio_destroy(soundio);
}
struct Test {
const char *name;
void (*fn)(void);
@ -51,6 +162,8 @@ struct Test {
static struct Test tests[] = {
{"os_get_time", test_os_get_time},
{"create output device", test_create_output_device},
{"ring buffer basic", test_ring_buffer_basic},
{"ring buffer threaded", test_ring_buffer_threaded},
{NULL, NULL},
};