class BaseRingBuffer
Defined at line 23 of file ../../src/media/audio/audio_core/ring_buffer.h
Base class for streams based on ring buffers.
Protected Members
RefPtr vmo_mapper_const int64_t frame_count_RefPtr ref_time_to_frac_presentation_frame_shared_ptr audio_clock_Public Methods
int64_t size ()Defined at line 66 of file ../../src/media/audio/audio_core/ring_buffer.h
int64_t frames ()Defined at line 67 of file ../../src/media/audio/audio_core/ring_buffer.h
uint8_t * virt ()Defined at line 68 of file ../../src/media/audio/audio_core/ring_buffer.h
std::shared_ptr<ReadableRingBuffer> CreateReadableHardwareBuffer (const Format & format, fbl::RefPtr<VersionedTimelineFunction> ref_time_to_frac_presentation_frame, std::shared_ptr<Clock> audio_clock, zx::vmo vmo, int64_t frame_count, SafeReadWriteFrameFn safe_read_frame)Creates a ring buffer buffer backed by the given |vmo|.
Readable buffers will function as if there is an AudioInput device populating the |vmo| with
audio frames conforming to |format|. Essentially the ring will consider frames |frame_count|
frames before |ref_time_to_frac_presentation_frame(now)| to be valid.
Conversely, writable buffers will vend out empty buffers that are up to |frame_count| frames
ahead of |ref_time_to_frac_presentation_frame(now)|, with the expectation there is
a hardware device consuming frames at the trailing edge.
|safe_read_frame| reports the last safe read frame at the current time.
|safe_write_frame| reports the first safe write frame at the current time.
Defined at line 222 of file ../../src/media/audio/audio_core/ring_buffer.cc
std::shared_ptr<WritableRingBuffer> CreateWritableHardwareBuffer (const Format & format, fbl::RefPtr<VersionedTimelineFunction> ref_time_to_frac_presentation_frame, std::shared_ptr<Clock> audio_clock, zx::vmo vmo, int64_t frame_count, SafeReadWriteFrameFn safe_write_frame)static
Defined at line 238 of file ../../src/media/audio/audio_core/ring_buffer.cc
Endpoints AllocateSoftwareBuffer (const Format & format, fbl::RefPtr<VersionedTimelineFunction> ref_time_to_frac_presentation_frame, std::shared_ptr<Clock> audio_clock, int64_t frame_count, SafeReadWriteFrameFn safe_write_frame)Creates a ring buffer with a freshly-allocated VMO.
Defined at line 148 of file ../../src/media/audio/audio_core/ring_buffer.cc
Protected Methods
void ~BaseRingBuffer ()Defined at line 75 of file ../../src/media/audio/audio_core/ring_buffer.h
void BaseRingBuffer (const Format & format, fbl::RefPtr<VersionedTimelineFunction> ref_time_to_frac_presentation_frame, std::shared_ptr<Clock> audio_clock, fbl::RefPtr<RefCountedVmoMapper> vmo_mapper, int64_t frame_count)Defined at line 114 of file ../../src/media/audio/audio_core/ring_buffer.cc
BaseStream::TimelineFunctionSnapshot ReferenceClockToFixedImpl ()Defined at line 314 of file ../../src/media/audio/audio_core/ring_buffer.cc