| // Copyright 2017 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "src/media/audio/audio_core/driver_ring_buffer.h" |
| |
| #include "src/lib/fxl/logging.h" |
| |
| namespace media::audio { |
| |
| // static |
| fbl::RefPtr<DriverRingBuffer> DriverRingBuffer::Create(zx::vmo vmo, |
| uint32_t frame_size, |
| uint32_t frame_count, |
| bool input) { |
| auto ret = fbl::AdoptRef(new DriverRingBuffer()); |
| |
| if (ret->Init(std::move(vmo), frame_size, frame_count, input) != ZX_OK) { |
| return nullptr; |
| } |
| |
| return ret; |
| } |
| |
| zx_status_t DriverRingBuffer::Init(zx::vmo vmo, uint32_t frame_size, |
| uint32_t frame_count, bool input) { |
| if (!vmo.is_valid()) { |
| FXL_LOG(ERROR) << "Invalid VMO!"; |
| return ZX_ERR_INVALID_ARGS; |
| } |
| |
| if (!frame_size) { |
| FXL_LOG(ERROR) << "Frame size may not be zero!"; |
| return ZX_ERR_INVALID_ARGS; |
| } |
| |
| uint64_t vmo_size; |
| zx_status_t res = vmo.get_size(&vmo_size); |
| |
| if (res != ZX_OK) { |
| FXL_LOG(ERROR) << "Failed to get ring buffer VMO size (res " << res << ")"; |
| return res; |
| } |
| |
| uint64_t size = static_cast<uint64_t>(frame_size) * frame_count; |
| if (size > vmo_size) { |
| FXL_LOG(ERROR) << "Driver-reported ring buffer size (" << size |
| << ") is greater than VMO size (" << vmo_size << ")"; |
| return res; |
| } |
| |
| // Map the VMO into our address space. |
| // TODO(johngro): How do I specify the cache policy for this mapping? |
| zx_vm_option_t flags = ZX_VM_PERM_READ | (input ? 0 : ZX_VM_PERM_WRITE); |
| res = vmo_mapper_.Map(vmo, 0u, size, flags); |
| |
| if (res != ZX_OK) { |
| FXL_LOG(ERROR) << "Failed to map ring buffer VMO (res " << res << ")"; |
| return res; |
| } |
| |
| frame_size_ = frame_size; |
| frames_ = frame_count; |
| |
| return res; |
| } |
| |
| } // namespace media::audio |