chromium/third_party/webrtc/modules/portal/pipewire_utils.h

/*
 *  Copyright 2022 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#ifndef MODULES_PORTAL_PIPEWIRE_UTILS_H_
#define MODULES_PORTAL_PIPEWIRE_UTILS_H_

#include <errno.h>
#include <stdint.h>
#include <sys/ioctl.h>
#include <sys/mman.h>

// static
struct dma_buf_sync { … };
#define DMA_BUF_SYNC_READ …
#define DMA_BUF_SYNC_START …
#define DMA_BUF_SYNC_END …
#define DMA_BUF_BASE …
#define DMA_BUF_IOCTL_SYNC …

struct pw_thread_loop;

namespace webrtc {

constexpr int kInvalidPipeWireFd = …;

// Prepare PipeWire so that it is ready to be used. If it needs to be dlopen'd
// this will do so. Note that this does not guarantee a PipeWire server is
// running nor does it establish a connection to one.
bool InitializePipeWire();

// Locks pw_thread_loop in the current scope
class PipeWireThreadLoopLock { … };

// We should synchronize DMA Buffer object access from CPU to avoid potential
// cache incoherency and data loss.
// See
// https://01.org/linuxgraphics/gfx-docs/drm/driver-api/dma-buf.html#cpu-access-to-dma-buffer-objects
static bool SyncDmaBuf(int fd, uint64_t start_or_end) { … }

class ScopedBuf { … };

}  // namespace webrtc

#endif  // MODULES_PORTAL_PIPEWIRE_UTILS_H_