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Builds out the full v1 scope: a vendored+patched openscreen subset for low-latency Cast Streaming (Mirroring receiver 0F5096E8) alongside the existing Cast V2/HLS and new DLNA/AVTransport casting paths, breadcastd's Idle/Casting state machine with a private IPC socket, the breadcast GTK4 popup as a thin IPC client, and bread.cast.*/bread.command.cast.* breadd integration (device discovery, start/stop, mirroring lifecycle events). Also adds bakery/systemd/Forgejo CI packaging. Validated end-to-end against a real Chromecast/Google TV: negotiated Cast Streaming session, live pipeline playback, and daemon+GUI click-to-cast/ stop through the actual popup.
60 lines
2.1 KiB
C++
60 lines
2.1 KiB
C++
// Copyright 2019 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef CAST_STREAMING_IMPL_PACKET_UTIL_H_
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#define CAST_STREAMING_IMPL_PACKET_UTIL_H_
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#include <utility>
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#include "cast/streaming/ssrc.h"
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#include "platform/base/span.h"
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#include "util/big_endian.h"
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#include "util/osp_logging.h"
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namespace openscreen::cast {
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// Reads a field from the start of the given span and advances the span to point
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// just after the field.
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template <typename Integer>
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inline Integer ConsumeField(ByteView& in) {
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OSP_CHECK_GE(in.size(), sizeof(Integer));
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const Integer result = ReadBigEndian<Integer>(in.data());
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in = in.subspan(sizeof(Integer));
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return result;
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}
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// Writes a field at the start of the given span and advances the span to point
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// just after the field.
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template <typename Integer>
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inline void AppendField(Integer value, ByteBuffer& out) {
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WriteBigEndian<Integer>(value, out.data());
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out = out.subspan(sizeof(Integer));
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}
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// Returns a bitmask for a field having the given number of bits. For example,
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// FieldBitmask<uint8_t>(5) returns 0b00011111.
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template <typename Integer>
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constexpr Integer FieldBitmask(unsigned field_size_in_bits) {
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return (Integer{1} << field_size_in_bits) - 1;
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}
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// Reserves `num_bytes` from the beginning of the given span, returning the
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// reserved space.
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inline ByteBuffer ReserveSpace(int num_bytes, ByteBuffer& out) {
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const ByteBuffer reserved = out.subspan(0, num_bytes);
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out = out.subspan(num_bytes);
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return reserved;
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}
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// Performs a quick-scan of the packet data for the purposes of routing it to an
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// appropriate parser. Identifies whether the packet is a RTP packet, RTCP
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// packet, or unknown; and provides the originator's SSRC. This only performs a
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// very quick scan of the packet data, and does not guarantee that a full parse
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// will later succeed.
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enum class ApparentPacketType { UNKNOWN, RTP, RTCP };
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std::pair<ApparentPacketType, Ssrc> InspectPacketForRouting(ByteView packet);
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} // namespace openscreen::cast
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#endif // CAST_STREAMING_IMPL_PACKET_UTIL_H_
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