feat(record): add depth RVL recording to MCAP

CMakeLists.txt

@@ -8,11 +8,13 @@ set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
 find_package(Threads REQUIRED)
 find_package(cppzmq QUIET)
+set(CVMMAP_LOCAL_ROOT "${CMAKE_CURRENT_LIST_DIR}/../cv-mmap" CACHE PATH "Path to a local cv-mmap checkout")
+set(CVMMAP_LOCAL_BUILD "${CVMMAP_LOCAL_ROOT}/build/core" CACHE PATH "Path to local cv-mmap build artifacts")
 if (
 	NOT cvmmap-core_DIR
-	AND EXISTS "${CMAKE_CURRENT_LIST_DIR}/../cv-mmap/build/core/cvmmap-coreConfig.cmake"
+	AND EXISTS "${CVMMAP_LOCAL_BUILD}/cvmmap-coreConfig.cmake"
-	AND EXISTS "${CMAKE_CURRENT_LIST_DIR}/../cv-mmap/build/core/cvmmap-coreTargets.cmake")
+	AND EXISTS "${CVMMAP_LOCAL_BUILD}/cvmmap-coreTargets.cmake")
-	set(cvmmap-core_DIR "${CMAKE_CURRENT_LIST_DIR}/../cv-mmap/build/core")
+	set(cvmmap-core_DIR "${CVMMAP_LOCAL_BUILD}")
 endif()
 if (cvmmap-core_DIR)
 	find_package(cvmmap-core CONFIG QUIET)
@@ -21,6 +23,7 @@ find_package(ZeroMQ QUIET)
 find_package(spdlog REQUIRED)
 find_package(Protobuf REQUIRED)
 find_package(PkgConfig REQUIRED)
+find_package(rvl CONFIG QUIET)
 
 if (EXISTS "${CMAKE_CURRENT_LIST_DIR}/lib/CLI11/CMakeLists.txt")
 	add_subdirectory("${CMAKE_CURRENT_LIST_DIR}/lib/CLI11" "${CMAKE_CURRENT_BINARY_DIR}/vendor/cli11")
@@ -32,8 +35,6 @@ pkg_check_modules(ZSTD REQUIRED IMPORTED_TARGET libzstd)
 pkg_check_modules(LZ4 REQUIRED IMPORTED_TARGET liblz4)
 
 if (NOT TARGET cvmmap::client)
-	set(CVMMAP_LOCAL_ROOT "${CMAKE_CURRENT_LIST_DIR}/../cv-mmap")
-	set(CVMMAP_LOCAL_BUILD "${CVMMAP_LOCAL_ROOT}/build/core")
 	if (
 		EXISTS "${CVMMAP_LOCAL_ROOT}/core/include/cvmmap/client.hpp"
 		AND EXISTS "${CVMMAP_LOCAL_BUILD}/libcvmmap_client.a"
@@ -48,6 +49,21 @@ if (NOT TARGET cvmmap::client)
 	endif()
 endif()
 
+if (NOT TARGET rvl::rvl)
+	set(RVL_LOCAL_ROOT "/home/crosstyan/Code/rvl_impl")
+	set(RVL_LOCAL_BUILD "${RVL_LOCAL_ROOT}/build/core")
+	if (
+		EXISTS "${RVL_LOCAL_ROOT}/core/include/rvl/rvl.hpp"
+		AND EXISTS "${RVL_LOCAL_BUILD}/librvl_core.a")
+		add_library(rvl::rvl INTERFACE IMPORTED)
+		set_target_properties(rvl::rvl PROPERTIES
+			INTERFACE_INCLUDE_DIRECTORIES "${RVL_LOCAL_ROOT}/core/include"
+			INTERFACE_LINK_LIBRARIES "${RVL_LOCAL_BUILD}/librvl_core.a")
+	else()
+		message(FATAL_ERROR "rvl::rvl target is unavailable and local rvl_impl build artifacts were not found")
+	endif()
+endif()
+
 set(CVMMAP_PROXY_INCLUDE_DIR "${CMAKE_CURRENT_LIST_DIR}/lib/proxy/include")
 if (NOT EXISTS "${CVMMAP_PROXY_INCLUDE_DIR}/proxy/proxy.h")
 	message(FATAL_ERROR "proxy headers not found at ${CVMMAP_PROXY_INCLUDE_DIR}")
@@ -59,11 +75,21 @@ protobuf_generate(
 	LANGUAGE cpp
 	PROTOS "${CMAKE_CURRENT_LIST_DIR}/proto/foxglove/CompressedVideo.proto"
 	IMPORT_DIRS "${CMAKE_CURRENT_LIST_DIR}/proto")
+add_library(cvmmap_streamer_depth_proto STATIC)
+protobuf_generate(
+	TARGET cvmmap_streamer_depth_proto
+	LANGUAGE cpp
+	PROTOS "${CMAKE_CURRENT_LIST_DIR}/proto/cvmmap_streamer/DepthMap.proto"
+	IMPORT_DIRS "${CMAKE_CURRENT_LIST_DIR}/proto")
 add_library(cvmmap_streamer_protobuf INTERFACE)
 target_include_directories(cvmmap_streamer_foxglove_proto
 	PUBLIC
 		"${CMAKE_CURRENT_BINARY_DIR}"
 		${Protobuf_INCLUDE_DIRS})
+target_include_directories(cvmmap_streamer_depth_proto
+	PUBLIC
+		"${CMAKE_CURRENT_BINARY_DIR}"
+		${Protobuf_INCLUDE_DIRS})
 target_include_directories(cvmmap_streamer_protobuf
 	INTERFACE
 		${Protobuf_INCLUDE_DIRS})
@@ -78,6 +104,17 @@ if (TARGET PkgConfig::PROTOBUF_PKG)
 	target_link_libraries(cvmmap_streamer_protobuf INTERFACE PkgConfig::PROTOBUF_PKG)
 endif()
 target_link_libraries(cvmmap_streamer_foxglove_proto PUBLIC cvmmap_streamer_protobuf)
+target_link_libraries(cvmmap_streamer_depth_proto PUBLIC cvmmap_streamer_protobuf)
+
+add_library(cvmmap_streamer_mcap_runtime STATIC
+	src/record/mcap_runtime.cpp)
+target_include_directories(cvmmap_streamer_mcap_runtime
+	PUBLIC
+		"${CMAKE_CURRENT_LIST_DIR}/lib/mcap/include")
+target_link_libraries(cvmmap_streamer_mcap_runtime
+	PUBLIC
+		PkgConfig::ZSTD
+		PkgConfig::LZ4)
 
 add_library(cvmmap_streamer_common STATIC
 	src/ipc/help.cpp
@@ -107,9 +144,12 @@ target_include_directories(cvmmap_streamer_common
 set(CVMMAP_STREAMER_LINK_DEPS
 	Threads::Threads
 	cvmmap_streamer_foxglove_proto
+	cvmmap_streamer_depth_proto
+	cvmmap_streamer_mcap_runtime
 	PkgConfig::FFMPEG
 	PkgConfig::ZSTD
 	PkgConfig::LZ4
+	rvl::rvl
 	cvmmap::client)
 
 if (TARGET cppzmq::cppzmq)
@@ -154,7 +194,9 @@ function(add_cvmmap_binary target source)
 	target_link_libraries(${target}
 		PRIVATE
 			cvmmap_streamer_common)
-	set_target_properties(${target} PROPERTIES OUTPUT_NAME "${target}")
+	set_target_properties(${target} PROPERTIES
+		OUTPUT_NAME "${target}"
+		RUNTIME_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/bin")
 endfunction()
 
 add_cvmmap_binary(cvmmap_streamer src/main_streamer.cpp)
@@ -163,6 +205,7 @@ add_cvmmap_binary(rtp_output_tester src/testers/rtp_output_tester.cpp)
 add_cvmmap_binary(rtmp_stub_tester src/testers/rtmp_stub_tester.cpp)
 add_cvmmap_binary(rtmp_output_tester src/testers/rtmp_output_tester.cpp)
 add_cvmmap_binary(ipc_snapshot_tester src/testers/ipc_snapshot_tester.cpp)
+add_cvmmap_binary(mcap_depth_record_tester src/testers/mcap_depth_record_tester.cpp)
 
 add_executable(mcap_reader_tester src/testers/mcap_reader_tester.cpp)
 target_include_directories(mcap_reader_tester
@@ -175,6 +218,8 @@ target_include_directories(mcap_reader_tester
 target_link_libraries(mcap_reader_tester
 	PRIVATE
 		cvmmap_streamer_foxglove_proto
+		cvmmap_streamer_depth_proto
+		cvmmap_streamer_mcap_runtime
 		PkgConfig::ZSTD
 		PkgConfig::LZ4)
 if (TARGET spdlog::spdlog)
@@ -189,6 +234,9 @@ target_link_libraries(mcap_reader_tester PRIVATE cvmmap_streamer_protobuf)
 if (TARGET PkgConfig::PROTOBUF_PKG)
 	target_link_libraries(mcap_reader_tester PRIVATE PkgConfig::PROTOBUF_PKG)
 endif()
+set_target_properties(mcap_reader_tester PROPERTIES
+	OUTPUT_NAME "mcap_reader_tester"
+	RUNTIME_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/bin")
 
 add_executable(mcap_replay_tester src/testers/mcap_replay_tester.cpp)
 target_include_directories(mcap_replay_tester
@@ -202,6 +250,7 @@ target_link_libraries(mcap_replay_tester
 	PRIVATE
 		Threads::Threads
 		cvmmap_streamer_foxglove_proto
+		cvmmap_streamer_mcap_runtime
 		PkgConfig::ZSTD
 		PkgConfig::LZ4)
 if (TARGET spdlog::spdlog)
@@ -216,3 +265,6 @@ target_link_libraries(mcap_replay_tester PRIVATE cvmmap_streamer_protobuf)
 if (TARGET PkgConfig::PROTOBUF_PKG)
 	target_link_libraries(mcap_replay_tester PRIVATE PkgConfig::PROTOBUF_PKG)
 endif()
+set_target_properties(mcap_replay_tester PROPERTIES
+	OUTPUT_NAME "mcap_replay_tester"
+	RUNTIME_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/bin")

include/cvmmap_streamer/config/runtime_config.hpp

@@ -83,6 +83,7 @@ struct McapRecordConfig {
 	bool enabled{false};
 	std::string path{"capture.mcap"};
 	std::string topic{"/camera/video"};
+	std::string depth_topic{"/camera/depth"};
 	std::string frame_id{"camera"};
 	McapCompression compression{McapCompression::Zstd};
 };

include/cvmmap_streamer/ipc/contracts.hpp

@@ -45,6 +45,12 @@ enum class PixelFormat : std::uint8_t {
 	YUYV,
 };
 
+enum class DepthUnit : std::uint8_t {
+	Unknown = 0,
+	Millimeter = 1,
+	Meter = 2,
+};
+
 enum class ModuleStatus : std::int32_t {
 	Online      = 0xa1,
 	Offline     = 0xa0,
@@ -57,6 +63,7 @@ enum class ParseError {
 	InvalidMagic,
 	UnsupportedVersion,
 	InvalidDepth,
+	InvalidDepthUnit,
 	InvalidPixelFormat,
 	InvalidModuleStatus,
 	PayloadLengthMismatch,
@@ -155,11 +162,23 @@ struct ControlResponseMessage {
 
 struct ValidatedShmView {
 	FrameMetadata metadata;
+	DepthUnit depth_unit{DepthUnit::Unknown};
 	std::span<const std::uint8_t> payload;
+	std::span<const std::uint8_t> left;
+	std::optional<FrameInfo> depth_info{};
+	std::span<const std::uint8_t> depth{};
+	std::optional<FrameInfo> confidence_info{};
+	std::span<const std::uint8_t> confidence{};
 };
 
 struct CoherentSnapshot {
 	FrameMetadata metadata;
+	DepthUnit depth_unit{DepthUnit::Unknown};
+	std::span<const std::uint8_t> left;
+	std::optional<FrameInfo> depth_info{};
+	std::span<const std::uint8_t> depth{};
+	std::optional<FrameInfo> confidence_info{};
+	std::span<const std::uint8_t> confidence{};
 	std::size_t bytes_copied;
 };
 

include/cvmmap_streamer/record/mcap_record_sink.hpp

@@ -2,13 +2,30 @@
 
 #include "cvmmap_streamer/config/runtime_config.hpp"
 #include "cvmmap_streamer/encode/encoded_access_unit.hpp"
+#include "cvmmap_streamer/ipc/contracts.hpp"
 
+#include <cstddef>
+#include <cstdint>
 #include <expected>
+#include <span>
 #include <string>
 #include <string_view>
 
 namespace cvmmap_streamer::record {
 
+enum class DepthEncoding {
+	RvlU16Lossless,
+	RvlF32,
+};
+
+struct RawDepthMapView {
+	std::uint64_t timestamp_ns{0};
+	std::uint32_t width{0};
+	std::uint32_t height{0};
+	ipc::DepthUnit source_unit{ipc::DepthUnit::Unknown};
+	std::span<const float> pixels{};
+};
+
 class McapRecordSink {
 public:
 	McapRecordSink() = default;
@@ -31,6 +48,9 @@ public:
 	[[nodiscard]]
 	std::expected<void, std::string> write_access_unit(const encode::EncodedAccessUnit &access_unit);
 
+	[[nodiscard]]
+	std::expected<void, std::string> write_depth_map(const RawDepthMapView &depth_map);
+
 	[[nodiscard]]
 	bool is_open() const;
 

proto/cvmmap_streamer/DepthMap.proto

@@ -0,0 +1,34 @@
+syntax = "proto3";
+
+package cvmmap_streamer;
+
+import "google/protobuf/timestamp.proto";
+
+message DepthMap {
+  enum DepthUnit {
+    DEPTH_UNIT_UNKNOWN = 0;
+    DEPTH_UNIT_MILLIMETER = 1;
+    DEPTH_UNIT_METER = 2;
+  }
+
+  enum StorageUnit {
+    STORAGE_UNIT_UNKNOWN = 0;
+    STORAGE_UNIT_MILLIMETER = 1;
+    STORAGE_UNIT_METER = 2;
+  }
+
+  enum Encoding {
+    ENCODING_UNKNOWN = 0;
+    RVL_U16_LOSSLESS = 1;
+    RVL_F32 = 2;
+  }
+
+  google.protobuf.Timestamp timestamp = 1;
+  string frame_id = 2;
+  uint32 width = 3;
+  uint32 height = 4;
+  DepthUnit source_unit = 5;
+  StorageUnit storage_unit = 6;
+  Encoding encoding = 7;
+  bytes data = 8;
+}

src/config/runtime_config.cpp

@@ -358,6 +358,10 @@ std::expected<void, std::string> apply_toml_file(RuntimeConfig &config, const st
 		config.record.mcap.enabled = true;
 		config.record.mcap.topic = *value;
 	}
+	if (auto value = toml_value<std::string>(table, "record.mcap.depth_topic")) {
+		config.record.mcap.enabled = true;
+		config.record.mcap.depth_topic = *value;
+	}
 	if (auto value = toml_value<std::string>(table, "record.mcap.frame_id")) {
 		config.record.mcap.enabled = true;
 		config.record.mcap.frame_id = *value;
@@ -555,6 +559,7 @@ std::expected<RuntimeConfig, std::string> parse_runtime_config(int argc, char **
 	std::string rtp_sdp_raw{};
 	std::string mcap_path_raw{};
 	std::string mcap_topic_raw{};
+	std::string mcap_depth_topic_raw{};
 	std::string mcap_frame_id_raw{};
 	std::string mcap_compression_raw{};
 	std::string queue_size_raw{};
@@ -594,6 +599,7 @@ std::expected<RuntimeConfig, std::string> parse_runtime_config(int argc, char **
 	app.add_flag("--mcap", mcap_enabled);
 	app.add_option("--mcap-path", mcap_path_raw);
 	app.add_option("--mcap-topic", mcap_topic_raw);
+	app.add_option("--mcap-depth-topic", mcap_depth_topic_raw);
 	app.add_option("--mcap-frame-id", mcap_frame_id_raw);
 	app.add_option("--mcap-compression", mcap_compression_raw);
 	app.add_option("--queue-size", queue_size_raw);
@@ -702,6 +708,10 @@ std::expected<RuntimeConfig, std::string> parse_runtime_config(int argc, char **
 		config.record.mcap.enabled = true;
 		config.record.mcap.topic = mcap_topic_raw;
 	}
+	if (!mcap_depth_topic_raw.empty()) {
+		config.record.mcap.enabled = true;
+		config.record.mcap.depth_topic = mcap_depth_topic_raw;
+	}
 	if (!mcap_frame_id_raw.empty()) {
 		config.record.mcap.enabled = true;
 		config.record.mcap.frame_id = mcap_frame_id_raw;
@@ -833,6 +843,9 @@ std::expected<void, std::string> validate_runtime_config(const RuntimeConfig &co
 	if (config.record.mcap.topic.empty()) {
 		return std::unexpected("invalid MCAP config: topic must not be empty");
 	}
+	if (config.record.mcap.depth_topic.empty()) {
+		return std::unexpected("invalid MCAP config: depth_topic must not be empty");
+	}
 	if (config.record.mcap.frame_id.empty()) {
 		return std::unexpected("invalid MCAP config: frame_id must not be empty");
 	}
@@ -871,6 +884,7 @@ std::string summarize_runtime_config(const RuntimeConfig &config) {
 	ss << ", mcap.enabled=" << (config.record.mcap.enabled ? "true" : "false");
 	ss << ", mcap.path=" << config.record.mcap.path;
 	ss << ", mcap.topic=" << config.record.mcap.topic;
+	ss << ", mcap.depth_topic=" << config.record.mcap.depth_topic;
 	ss << ", mcap.frame_id=" << config.record.mcap.frame_id;
 	ss << ", mcap.compression=" << to_string(config.record.mcap.compression);
 	ss << ", latency.queue_size=" << config.latency.queue_size;

src/ipc/contracts.cpp

@@ -97,6 +97,19 @@ namespace {
 		return static_cast<PixelFormat>(pixel_format_raw);
 	}
 
+	[[nodiscard]]
+	DepthUnit from_core_depth_unit(const cvmmap::DepthUnit unit) {
+		switch (unit) {
+		case cvmmap::DepthUnit::Millimeter:
+			return DepthUnit::Millimeter;
+		case cvmmap::DepthUnit::Meter:
+			return DepthUnit::Meter;
+		case cvmmap::DepthUnit::Unknown:
+		default:
+			return DepthUnit::Unknown;
+		}
+	}
+
 	[[nodiscard]]
 	std::expected<ModuleStatus, ParseError> validate_module_status(std::int32_t status_raw) {
 		switch (status_raw) {
@@ -119,6 +132,9 @@ namespace {
 		if (error.contains("version")) {
 			return ParseError::UnsupportedVersion;
 		}
+		if (error.contains("depth_unit")) {
+			return ParseError::InvalidDepthUnit;
+		}
 		if (error.contains("depth")) {
 			return ParseError::InvalidDepth;
 		}
@@ -145,6 +161,58 @@ namespace {
 		return converted;
 	}
 
+	[[nodiscard]]
+	FrameInfo from_core_frame_info(const cvmmap::frame_info_t &info) {
+		FrameInfo converted{};
+		converted.width = info.width;
+		converted.height = info.height;
+		converted.channels = info.channels;
+		converted.depth = static_cast<Depth>(info.depth);
+		converted.pixel_format = static_cast<PixelFormat>(info.pixel_format);
+		converted.buffer_size = info.buffer_size;
+		return converted;
+	}
+
+	[[nodiscard]]
+	std::size_t span_offset(
+		const std::span<const std::uint8_t> outer,
+		const std::span<const std::uint8_t> inner) {
+		if (inner.empty()) {
+			return 0;
+		}
+		return static_cast<std::size_t>(inner.data() - outer.data());
+	}
+
+	[[nodiscard]]
+	std::size_t payload_bytes_for(
+		const std::span<const std::uint8_t> payload_region,
+		const cvmmap::parsed_frame_metadata_t &metadata) {
+		std::size_t payload_bytes = metadata.left_plane.size();
+		const auto consider = [&](std::span<const std::uint8_t> plane) {
+			if (plane.empty()) {
+				return;
+			}
+			payload_bytes = std::max(
+				payload_bytes,
+				span_offset(payload_region, plane) + plane.size());
+		};
+		consider(metadata.depth_plane);
+		consider(metadata.confidence_plane);
+		return payload_bytes;
+	}
+
+	[[nodiscard]]
+	std::span<const std::uint8_t> translate_span(
+		const std::span<const std::uint8_t> source_payload,
+		const std::span<const std::uint8_t> destination_payload,
+		const std::span<const std::uint8_t> source_plane) {
+		if (source_plane.empty()) {
+			return {};
+		}
+		const auto offset = span_offset(source_payload, source_plane);
+		return destination_payload.subspan(offset, source_plane.size());
+	}
+
 }
 
 std::string_view to_string(ParseError error) {
@@ -159,6 +227,8 @@ std::string_view to_string(ParseError error) {
 		return "unsupported version";
 	case ParseError::InvalidDepth:
 		return "invalid depth";
+	case ParseError::InvalidDepthUnit:
+		return "invalid depth unit";
 	case ParseError::InvalidPixelFormat:
 		return "invalid pixel format";
 	case ParseError::InvalidModuleStatus:
@@ -344,9 +414,22 @@ std::expected<ValidatedShmView, ParseError> validate_shm_region(std::span<const
 		return std::unexpected(map_core_parser_error(metadata_result.error()));
 	}
 
+	const auto payload_region = shm_region.subspan(kShmPayloadOffset);
+	const auto payload_bytes = payload_bytes_for(payload_region, *metadata_result);
+
 	return ValidatedShmView{
 		.metadata = from_core_metadata(metadata_result->normalized_metadata),
-		.payload  = metadata_result->left_plane};
+		.depth_unit = from_core_depth_unit(metadata_result->depth_unit),
+		.payload  = payload_region.first(payload_bytes),
+		.left = metadata_result->left_plane,
+		.depth_info = metadata_result->depth_info
+			? std::optional<FrameInfo>(from_core_frame_info(*metadata_result->depth_info))
+			: std::nullopt,
+		.depth = metadata_result->depth_plane,
+		.confidence_info = metadata_result->confidence_info
+			? std::optional<FrameInfo>(from_core_frame_info(*metadata_result->confidence_info))
+			: std::nullopt,
+		.confidence = metadata_result->confidence_plane};
 }
 
 std::expected<CoherentSnapshot, SnapshotError> read_coherent_snapshot(
@@ -378,8 +461,16 @@ std::expected<CoherentSnapshot, SnapshotError> read_coherent_snapshot(
 		return std::unexpected(SnapshotError::TornRead);
 	}
 
+	const auto copied_payload = std::span<const std::uint8_t>(destination.data(), first->payload.size());
+
 	return CoherentSnapshot{
 		.metadata     = first->metadata,
+		.depth_unit   = first->depth_unit,
+		.left         = translate_span(first->payload, copied_payload, first->left),
+		.depth_info   = first->depth_info,
+		.depth        = translate_span(first->payload, copied_payload, first->depth),
+		.confidence_info = first->confidence_info,
+		.confidence   = translate_span(first->payload, copied_payload, first->confidence),
 		.bytes_copied = first->payload.size()};
 }
 

src/ipc/help.cpp

@@ -34,6 +34,7 @@ constexpr std::array<std::string_view, 32> kHelpLines{
 		"  --mcap\t\tenable MCAP recording",
 	"  --mcap-path <path>\tMCAP output file",
 	"  --mcap-topic <topic>\tMCAP topic name",
+	"  --mcap-depth-topic <topic>\tMCAP depth topic name",
 	"  --mcap-frame-id <id>\tFoxglove CompressedVideo frame_id",
 	"  --mcap-compression <mode>\tnone|lz4|zstd",
 	"",

src/pipeline/pipeline_runtime.cpp

@@ -192,6 +192,44 @@ bool frame_info_equal(const ipc::FrameInfo &lhs, const ipc::FrameInfo &rhs) {
 		   lhs.buffer_size == rhs.buffer_size;
 }
 
+[[nodiscard]]
+std::expected<record::RawDepthMapView, std::string> make_depth_map_view(const ipc::CoherentSnapshot &snapshot) {
+	if (!snapshot.depth_info) {
+		return std::unexpected("depth plane metadata is missing");
+	}
+	if (snapshot.depth.empty()) {
+		return std::unexpected("depth plane bytes are missing");
+	}
+	if (snapshot.depth_unit == ipc::DepthUnit::Unknown) {
+		return std::unexpected("depth plane unit is unknown");
+	}
+
+	const auto &depth_info = *snapshot.depth_info;
+	if (depth_info.depth != ipc::Depth::F32 || depth_info.pixel_format != ipc::PixelFormat::GRAY) {
+		return std::unexpected("depth plane must be GRAY/F32");
+	}
+
+	const auto pixel_count = static_cast<std::size_t>(depth_info.width) * static_cast<std::size_t>(depth_info.height);
+	const auto expected_bytes = pixel_count * sizeof(float);
+	if (snapshot.depth.size() != expected_bytes) {
+		return std::unexpected(
+			"depth plane byte size does not match width*height*sizeof(float)");
+	}
+	if ((reinterpret_cast<std::uintptr_t>(snapshot.depth.data()) % alignof(float)) != 0) {
+		return std::unexpected("depth plane is not aligned for float access");
+	}
+
+	return record::RawDepthMapView{
+		.timestamp_ns = snapshot.metadata.timestamp_ns,
+		.width = depth_info.width,
+		.height = depth_info.height,
+		.source_unit = snapshot.depth_unit,
+		.pixels = std::span<const float>(
+			reinterpret_cast<const float *>(snapshot.depth.data()),
+			pixel_count),
+	};
+}
+
 [[nodiscard]]
 Status publish_access_units(
 	const RuntimeConfig &config,
@@ -338,6 +376,7 @@ int run_pipeline(const RuntimeConfig &config) {
 	std::optional<ipc::FrameInfo> active_info{};
 	std::optional<ipc::FrameInfo> restart_target_info{};
 	bool restart_pending{false};
+	bool warned_unknown_depth_unit{false};
 
 	const auto restart_backend = [&](std::string_view reason, std::optional<ipc::FrameInfo> target_info) {
 		if (started) {
@@ -352,6 +391,7 @@ int run_pipeline(const RuntimeConfig &config) {
 		started = false;
 		restart_pending = true;
 		restart_target_info = target_info;
+		warned_unknown_depth_unit = false;
 		rtmp_output.reset();
 	};
 
@@ -404,6 +444,7 @@ int run_pipeline(const RuntimeConfig &config) {
 		started = true;
 		restart_pending = false;
 		restart_target_info.reset();
+		warned_unknown_depth_unit = false;
 		active_info = target_info;
 		return {};
 	};
@@ -510,6 +551,29 @@ int run_pipeline(const RuntimeConfig &config) {
 				continue;
 			}
 
+			if (mcap_sink.has_value() && !snapshot->depth.empty()) {
+				if (snapshot->depth_unit == ipc::DepthUnit::Unknown) {
+					if (!warned_unknown_depth_unit) {
+						spdlog::warn("pipeline depth plane present but depth_unit is unknown; skipping depth MCAP recording");
+						warned_unknown_depth_unit = true;
+					}
+				} else {
+					auto depth_map = make_depth_map_view(*snapshot);
+					if (!depth_map) {
+						const auto reason = "pipeline depth snapshot invalid: " + depth_map.error();
+						restart_backend(reason, active_info);
+						continue;
+					}
+
+					auto write_depth = mcap_sink->write_depth_map(*depth_map);
+					if (!write_depth) {
+						const auto reason = "pipeline depth MCAP write failed: " + write_depth.error();
+						restart_backend(reason, active_info);
+						continue;
+					}
+				}
+			}
+
 			stats.pushed_frames += 1;
 			auto drain = drain_encoder(
 				config,

src/record/mcap_record_sink.cpp

@@ -1,16 +1,19 @@
-#define MCAP_IMPLEMENTATION
 #include <mcap/writer.hpp>
 
 #include "cvmmap_streamer/record/mcap_record_sink.hpp"
 
 #include "protobuf_descriptor.hpp"
+#include "cvmmap_streamer/DepthMap.pb.h"
 #include "foxglove/CompressedVideo.pb.h"
+#include <rvl/rvl.hpp>
 
 #include <google/protobuf/timestamp.pb.h>
 
+#include <cmath>
 #include <cstddef>
 #include <cstdint>
 #include <expected>
+#include <limits>
 #include <memory>
 #include <span>
 #include <string>
@@ -22,11 +25,20 @@ namespace cvmmap_streamer::record {
 
 namespace {
 
+constexpr float kRvlDepthQuantization = 200.0f;
+constexpr float kMinDepthMaxMeters = 20.0f;
+
 [[nodiscard]]
 std::string codec_format(CodecType codec) {
 	return codec == CodecType::H265 ? "h265" : "h264";
 }
 
+struct EncodedDepthPayload {
+	DepthEncoding encoding{DepthEncoding::RvlF32};
+	ipc::DepthUnit storage_unit{ipc::DepthUnit::Unknown};
+	std::vector<std::uint8_t> bytes{};
+};
+
 [[nodiscard]]
 mcap::Compression to_mcap_compression(McapCompression compression) {
 	switch (compression) {
@@ -48,6 +60,43 @@ google::protobuf::Timestamp to_proto_timestamp(std::uint64_t timestamp_ns) {
 	return timestamp;
 }
 
+[[nodiscard]]
+cvmmap_streamer::DepthMap::DepthUnit to_proto_depth_unit(ipc::DepthUnit unit) {
+	switch (unit) {
+	case ipc::DepthUnit::Millimeter:
+		return cvmmap_streamer::DepthMap::DEPTH_UNIT_MILLIMETER;
+	case ipc::DepthUnit::Meter:
+		return cvmmap_streamer::DepthMap::DEPTH_UNIT_METER;
+	case ipc::DepthUnit::Unknown:
+	default:
+		return cvmmap_streamer::DepthMap::DEPTH_UNIT_UNKNOWN;
+	}
+}
+
+[[nodiscard]]
+cvmmap_streamer::DepthMap::StorageUnit to_proto_storage_unit(ipc::DepthUnit unit) {
+	switch (unit) {
+	case ipc::DepthUnit::Millimeter:
+		return cvmmap_streamer::DepthMap::STORAGE_UNIT_MILLIMETER;
+	case ipc::DepthUnit::Meter:
+		return cvmmap_streamer::DepthMap::STORAGE_UNIT_METER;
+	case ipc::DepthUnit::Unknown:
+	default:
+		return cvmmap_streamer::DepthMap::STORAGE_UNIT_UNKNOWN;
+	}
+}
+
+[[nodiscard]]
+cvmmap_streamer::DepthMap::Encoding to_proto_depth_encoding(DepthEncoding encoding) {
+	switch (encoding) {
+	case DepthEncoding::RvlU16Lossless:
+		return cvmmap_streamer::DepthMap::RVL_U16_LOSSLESS;
+	case DepthEncoding::RvlF32:
+	default:
+		return cvmmap_streamer::DepthMap::RVL_F32;
+	}
+}
+
 void append_start_code(std::vector<std::uint8_t> &output) {
 	output.push_back(0x00);
 	output.push_back(0x00);
@@ -176,14 +225,96 @@ std::expected<std::vector<std::uint8_t>, std::string> decoder_config_to_annexb(
 	return avcc_to_annexb(decoder_config);
 }
 
+[[nodiscard]]
+bool can_encode_lossless_u16_mm(const RawDepthMapView &depth_map) {
+	if (depth_map.source_unit != ipc::DepthUnit::Millimeter) {
+		return false;
+	}
+
+	for (const float sample : depth_map.pixels) {
+		if (!std::isfinite(sample) || sample <= 0.0f) {
+			continue;
+		}
+		if (sample > static_cast<float>(std::numeric_limits<std::uint16_t>::max())) {
+			return false;
+		}
+		if (std::fabs(sample - std::round(sample)) > 1e-3f) {
+			return false;
+		}
+	}
+
+	return true;
+}
+
+[[nodiscard]]
+std::expected<EncodedDepthPayload, std::string> encode_depth_payload(const RawDepthMapView &depth_map) {
+	const auto pixel_count = static_cast<std::size_t>(depth_map.width) * static_cast<std::size_t>(depth_map.height);
+	if (depth_map.width == 0 || depth_map.height == 0) {
+		return std::unexpected("depth map dimensions must be non-zero");
+	}
+	if (pixel_count != depth_map.pixels.size()) {
+		return std::unexpected("depth map dimensions do not match the pixel buffer");
+	}
+	if (depth_map.source_unit == ipc::DepthUnit::Unknown) {
+		return std::unexpected("depth source unit is unknown");
+	}
+
+	try {
+		if (can_encode_lossless_u16_mm(depth_map)) {
+			std::vector<std::uint16_t> pixels(pixel_count, 0);
+			for (std::size_t index = 0; index < pixel_count; ++index) {
+				const float sample = depth_map.pixels[index];
+				if (!std::isfinite(sample) || sample <= 0.0f) {
+					continue;
+				}
+				pixels[index] = static_cast<std::uint16_t>(std::lrint(sample));
+			}
+
+			return EncodedDepthPayload{
+				.encoding = DepthEncoding::RvlU16Lossless,
+				.storage_unit = ipc::DepthUnit::Millimeter,
+				.bytes = rvl::compress_image(pixels, depth_map.height, depth_map.width),
+			};
+		}
+
+		std::vector<float> depth_m(pixel_count, std::numeric_limits<float>::quiet_NaN());
+		float finite_max_m = 0.0f;
+		for (std::size_t index = 0; index < pixel_count; ++index) {
+			float sample = depth_map.pixels[index];
+			if (depth_map.source_unit == ipc::DepthUnit::Millimeter && std::isfinite(sample)) {
+				sample *= 0.001f;
+			}
+			if (!std::isfinite(sample) || sample <= 0.0f) {
+				continue;
+			}
+
+			depth_m[index] = sample;
+			finite_max_m = std::max(finite_max_m, sample);
+		}
+
+		const auto parameters = rvl::make_quantization_parameters(
+			std::max(finite_max_m, kMinDepthMaxMeters),
+			kRvlDepthQuantization);
+		return EncodedDepthPayload{
+			.encoding = DepthEncoding::RvlF32,
+			.storage_unit = ipc::DepthUnit::Meter,
+			.bytes = rvl::compress_float_image(depth_m, depth_map.height, depth_map.width, parameters),
+		};
+	} catch (const std::exception &error) {
+		return std::unexpected(std::string("failed to RVL-encode depth map: ") + error.what());
+	}
+}
+
 }
 
 struct McapRecordSink::State {
 	mcap::McapWriter writer{};
 	std::string path{};
 	std::string frame_id{};
-	mcap::ChannelId channel_id{0};
+	mcap::ChannelId video_channel_id{0};
-	std::uint32_t sequence{0};
+	mcap::ChannelId depth_channel_id{0};
+	std::uint32_t video_sequence{0};
+	std::uint32_t depth_sequence{0};
 	CodecType codec{CodecType::H264};
 	std::vector<std::uint8_t> keyframe_preamble{};
 };
@@ -232,7 +363,20 @@ std::expected<McapRecordSink, std::string> McapRecordSink::create(
 
 	mcap::Channel channel(config.record.mcap.topic, "protobuf", schema.id);
 	state->writer.addChannel(channel);
-	state->channel_id = channel.id;
+	state->video_channel_id = channel.id;
+
+	const auto depth_descriptor_set = build_file_descriptor_set(cvmmap_streamer::DepthMap::descriptor());
+	std::string depth_schema_bytes{};
+	if (!depth_descriptor_set.SerializeToString(&depth_schema_bytes)) {
+		return std::unexpected("failed to serialize cvmmap_streamer.DepthMap descriptor set");
+	}
+
+	mcap::Schema depth_schema("cvmmap_streamer.DepthMap", "protobuf", depth_schema_bytes);
+	state->writer.addSchema(depth_schema);
+
+	mcap::Channel depth_channel(config.record.mcap.depth_topic, "protobuf", depth_schema.id);
+	state->writer.addChannel(depth_channel);
+	state->depth_channel_id = depth_channel.id;
 
 	sink.state_ = state.release();
 	auto update = sink.update_stream_info(stream_info);
@@ -281,8 +425,8 @@ std::expected<void, std::string> McapRecordSink::write_access_unit(const encode:
 	}
 
 	mcap::Message record{};
-	record.channelId   = state_->channel_id;
+	record.channelId   = state_->video_channel_id;
-	record.sequence    = state_->sequence++;
+	record.sequence    = state_->video_sequence++;
 	record.logTime     = access_unit.source_timestamp_ns;
 	record.publishTime = access_unit.source_timestamp_ns;
 	record.data        = reinterpret_cast<const std::byte *>(serialized.data());
@@ -295,6 +439,48 @@ std::expected<void, std::string> McapRecordSink::write_access_unit(const encode:
 	return {};
 }
 
+std::expected<void, std::string> McapRecordSink::write_depth_map(const RawDepthMapView &depth_map) {
+	if (state_ == nullptr) {
+		return std::unexpected("MCAP sink is not open");
+	}
+
+	auto encoded = encode_depth_payload(depth_map);
+	if (!encoded) {
+		return std::unexpected(encoded.error());
+	}
+
+	cvmmap_streamer::DepthMap message{};
+	*message.mutable_timestamp() = to_proto_timestamp(depth_map.timestamp_ns);
+	message.set_frame_id(state_->frame_id);
+	message.set_width(depth_map.width);
+	message.set_height(depth_map.height);
+	message.set_source_unit(to_proto_depth_unit(depth_map.source_unit));
+	message.set_storage_unit(to_proto_storage_unit(encoded->storage_unit));
+	message.set_encoding(to_proto_depth_encoding(encoded->encoding));
+	message.set_data(
+		reinterpret_cast<const char *>(encoded->bytes.data()),
+		static_cast<int>(encoded->bytes.size()));
+
+	std::string serialized{};
+	if (!message.SerializeToString(&serialized)) {
+		return std::unexpected("failed to serialize cvmmap_streamer.DepthMap");
+	}
+
+	mcap::Message record{};
+	record.channelId   = state_->depth_channel_id;
+	record.sequence    = state_->depth_sequence++;
+	record.logTime     = depth_map.timestamp_ns;
+	record.publishTime = depth_map.timestamp_ns;
+	record.data        = reinterpret_cast<const std::byte *>(serialized.data());
+	record.dataSize    = serialized.size();
+
+	const auto write_status = state_->writer.write(record);
+	if (!write_status.ok()) {
+		return std::unexpected("failed to write MCAP depth message: " + write_status.message);
+	}
+	return {};
+}
+
 bool McapRecordSink::is_open() const {
 	return state_ != nullptr;
 }

src/record/mcap_runtime.cpp

@@ -0,0 +1,3 @@
+#define MCAP_IMPLEMENTATION
+#include <mcap/reader.hpp>
+#include <mcap/writer.hpp>

src/testers/ipc_snapshot_tester.cpp

@@ -2,6 +2,7 @@
 #include <array>
 #include <cstddef>
 #include <cstdint>
+#include <cstring>
 #include <span>
 
 #include <spdlog/spdlog.h>
@@ -29,12 +30,19 @@ constexpr std::size_t kVersionMajorOffset    = 8;
 constexpr std::size_t kVersionMinorOffset    = 9;
 constexpr std::size_t kFrameCountOffset      = 12;
 constexpr std::size_t kTimestampOffset       = 16;
-constexpr std::size_t kInfoWidthOffset       = 24;
+constexpr std::size_t kPublishSeqOffset      = 24;
-constexpr std::size_t kInfoHeightOffset      = 26;
+constexpr std::size_t kPlaneCountOffset      = 32;
-constexpr std::size_t kInfoChannelsOffset    = 28;
+constexpr std::size_t kPlaneMaskOffset       = 33;
-constexpr std::size_t kInfoDepthOffset       = 29;
+constexpr std::size_t kDescriptorOffsetField = 34;
-constexpr std::size_t kInfoPixelFormatOffset = 30;
+constexpr std::size_t kDescriptorSizeField   = 36;
-constexpr std::size_t kInfoBufferSizeOffset  = 32;
+constexpr std::size_t kDescriptorCapField    = 38;
+constexpr std::size_t kPayloadSizeOffset     = 40;
+constexpr std::size_t kDepthUnitOffset       = 44;
+constexpr std::size_t kDescriptorsOffset     = 64;
+constexpr std::size_t kDescriptorSizeBytes   = 24;
+constexpr std::size_t kLeftSizeBytes         = 4;
+constexpr std::size_t kDepthSizeBytes        = 16;
+constexpr std::size_t kPayloadSizeBytes      = kLeftSizeBytes + kDepthSizeBytes;
 
 void write_u16_le(std::span<std::uint8_t> buffer, std::size_t offset, std::uint16_t value) {
 	buffer[offset]     = static_cast<std::uint8_t>(value & 0xffu);
@@ -54,25 +62,71 @@ void write_u64_le(std::span<std::uint8_t> buffer, std::size_t offset, std::uint6
 	}
 }
 
+void write_descriptor(
+	std::span<std::uint8_t> buffer,
+	std::size_t descriptor_index,
+	std::uint8_t plane_type,
+	std::uint8_t pixel_format,
+	std::uint8_t depth,
+	std::uint32_t width,
+	std::uint32_t height,
+	std::uint32_t stride_bytes,
+	std::uint32_t offset_bytes,
+	std::uint32_t size_bytes) {
+	const auto base = kDescriptorsOffset + descriptor_index * kDescriptorSizeBytes;
+	buffer[base + 0] = plane_type;
+	buffer[base + 1] = pixel_format;
+	buffer[base + 2] = depth;
+	write_u32_le(buffer, base + 4, width);
+	write_u32_le(buffer, base + 8, height);
+	write_u32_le(buffer, base + 12, stride_bytes);
+	write_u32_le(buffer, base + 16, offset_bytes);
+	write_u32_le(buffer, base + 20, size_bytes);
+}
+
 void write_metadata(
 	std::span<std::uint8_t> buffer,
 	std::uint32_t frame_count,
-	std::uint64_t timestamp_ns,
+	std::uint64_t timestamp_ns) {
-	std::uint32_t payload_size) {
 	std::copy(
 		cvmmap_streamer::ipc::kFrameMetadataMagic.begin(),
 		cvmmap_streamer::ipc::kFrameMetadataMagic.end(),
 		buffer.begin() + kMagicOffset);
-	buffer[kVersionMajorOffset] = cvmmap_streamer::ipc::kVersionMajor;
+	buffer[kVersionMajorOffset] = 2;
 	buffer[kVersionMinorOffset] = cvmmap_streamer::ipc::kVersionMinor;
 	write_u32_le(buffer, kFrameCountOffset, frame_count);
 	write_u64_le(buffer, kTimestampOffset, timestamp_ns);
-	write_u16_le(buffer, kInfoWidthOffset, 2);
+	write_u64_le(buffer, kPublishSeqOffset, frame_count);
-	write_u16_le(buffer, kInfoHeightOffset, 2);
+	buffer[kPlaneCountOffset] = 2;
-	buffer[kInfoChannelsOffset]    = 1;
+	buffer[kPlaneMaskOffset] = 0x03;
-	buffer[kInfoDepthOffset]       = static_cast<std::uint8_t>(cvmmap_streamer::ipc::Depth::U8);
+	write_u16_le(buffer, kDescriptorOffsetField, static_cast<std::uint16_t>(kDescriptorsOffset));
-	buffer[kInfoPixelFormatOffset] = static_cast<std::uint8_t>(cvmmap_streamer::ipc::PixelFormat::GRAY);
+	write_u16_le(buffer, kDescriptorSizeField, static_cast<std::uint16_t>(kDescriptorSizeBytes));
-	write_u32_le(buffer, kInfoBufferSizeOffset, payload_size);
+	write_u16_le(buffer, kDescriptorCapField, 4);
+	write_u32_le(buffer, kPayloadSizeOffset, static_cast<std::uint32_t>(kPayloadSizeBytes));
+	buffer[kDepthUnitOffset] = static_cast<std::uint8_t>(cvmmap_streamer::ipc::DepthUnit::Millimeter);
+
+	write_descriptor(
+		buffer,
+		0,
+		0,
+		static_cast<std::uint8_t>(cvmmap_streamer::ipc::PixelFormat::GRAY),
+		static_cast<std::uint8_t>(cvmmap_streamer::ipc::Depth::U8),
+		2,
+		2,
+		2,
+		0,
+		static_cast<std::uint32_t>(kLeftSizeBytes));
+	write_descriptor(
+		buffer,
+		1,
+		1,
+		static_cast<std::uint8_t>(cvmmap_streamer::ipc::PixelFormat::GRAY),
+		static_cast<std::uint8_t>(cvmmap_streamer::ipc::Depth::F32),
+		2,
+		2,
+		8,
+		static_cast<std::uint32_t>(kLeftSizeBytes),
+		static_cast<std::uint32_t>(kDepthSizeBytes));
 }
 
 }
@@ -83,22 +137,38 @@ int main(int argc, char **argv) {
 		return exit_code(TesterExitCode::Success);
 	}
 
-	std::array<std::uint8_t, cvmmap_streamer::ipc::kShmPayloadOffset + 32> shm{};
+	std::array<std::uint8_t, cvmmap_streamer::ipc::kShmPayloadOffset + kPayloadSizeBytes> shm{};
 	auto shm_view = std::span<std::uint8_t>(shm);
 
-	write_metadata(shm_view, 7, 2222, 32);
+	write_metadata(shm_view, 7, 2222);
-	for (std::size_t i = 0; i < 32; ++i) {
+	for (std::size_t i = 0; i < kLeftSizeBytes; ++i) {
 		shm[cvmmap_streamer::ipc::kShmPayloadOffset + i] = static_cast<std::uint8_t>(i + 1);
 	}
+	const float depth_samples[4] = {1000.0f, 2000.0f, 0.0f, -1.0f};
+	std::memcpy(
+		shm.data() + cvmmap_streamer::ipc::kShmPayloadOffset + kLeftSizeBytes,
+		depth_samples,
+		sizeof(depth_samples));
 
-	std::array<std::uint8_t, 32> destination{};
+	std::array<std::uint8_t, kPayloadSizeBytes> destination{};
 	auto valid = cvmmap_streamer::ipc::read_coherent_snapshot(shm_view, destination);
 	if (!valid) {
 		spdlog::error("coherent snapshot should succeed: {}", cvmmap_streamer::ipc::to_string(valid.error()));
 		return exit_code(TesterExitCode::ReadError);
 	}
 
-	if (valid->bytes_copied != 32 || valid->metadata.frame_count != 7 || valid->metadata.timestamp_ns != 2222) {
+	float copied_depth_first = 0.0f;
+	if (valid->depth.size() >= sizeof(float)) {
+		std::memcpy(&copied_depth_first, valid->depth.data(), sizeof(float));
+	}
+	if (valid->bytes_copied != kPayloadSizeBytes ||
+		valid->metadata.frame_count != 7 ||
+		valid->metadata.timestamp_ns != 2222 ||
+		valid->depth_unit != cvmmap_streamer::ipc::DepthUnit::Millimeter ||
+		valid->left.size() != kLeftSizeBytes ||
+		valid->depth.size() != kDepthSizeBytes ||
+		!valid->depth_info.has_value() ||
+		copied_depth_first != 1000.0f) {
 		spdlog::error("valid snapshot verification failed");
 		return exit_code(TesterExitCode::VerificationError);
 	}

src/testers/mcap_depth_record_tester.cpp

@@ -0,0 +1,238 @@
+#include <mcap/reader.hpp>
+
+#include "cvmmap_streamer/DepthMap.pb.h"
+#include "cvmmap_streamer/common.h"
+#include "cvmmap_streamer/record/mcap_record_sink.hpp"
+#include "foxglove/CompressedVideo.pb.h"
+
+#include <rvl/rvl.hpp>
+#include <spdlog/spdlog.h>
+
+#include <cmath>
+#include <cstdint>
+#include <filesystem>
+#include <limits>
+#include <optional>
+#include <string>
+#include <vector>
+
+namespace {
+
+enum class TesterExitCode : int {
+	Success = 0,
+	CreateError = 2,
+	WriteError = 3,
+	OpenError = 4,
+	VerificationError = 5,
+};
+
+[[nodiscard]]
+constexpr int exit_code(TesterExitCode code) {
+	return static_cast<int>(code);
+}
+
+[[nodiscard]]
+bool approx_equal(float lhs, float rhs, float tolerance) {
+	return std::fabs(lhs - rhs) <= tolerance;
+}
+
+}
+
+int main(int argc, char **argv) {
+	if (cvmmap_streamer::has_help_flag(argc, argv)) {
+		cvmmap_streamer::print_help("mcap_depth_record_tester");
+		return exit_code(TesterExitCode::Success);
+	}
+
+	const std::filesystem::path output_path =
+		argc > 1
+			? std::filesystem::path(argv[1])
+			: std::filesystem::temp_directory_path() / "cvmmap_streamer_depth_record_test.mcap";
+	if (output_path.has_parent_path()) {
+		std::filesystem::create_directories(output_path.parent_path());
+	}
+
+	cvmmap_streamer::RuntimeConfig config = cvmmap_streamer::RuntimeConfig::defaults();
+	config.record.mcap.enabled = true;
+	config.record.mcap.path = output_path.string();
+	config.record.mcap.topic = "/camera/video";
+	config.record.mcap.depth_topic = "/camera/depth";
+	config.record.mcap.frame_id = "camera";
+	config.record.mcap.compression = cvmmap_streamer::McapCompression::None;
+
+	cvmmap_streamer::encode::EncodedStreamInfo stream_info{};
+	stream_info.codec = cvmmap_streamer::CodecType::H264;
+
+	auto sink = cvmmap_streamer::record::McapRecordSink::create(config, stream_info);
+	if (!sink) {
+		spdlog::error("failed to create MCAP sink: {}", sink.error());
+		return exit_code(TesterExitCode::CreateError);
+	}
+
+	cvmmap_streamer::encode::EncodedAccessUnit access_unit{};
+	access_unit.codec = cvmmap_streamer::CodecType::H264;
+	access_unit.source_timestamp_ns = 10;
+	access_unit.stream_pts_ns = 10;
+	access_unit.keyframe = false;
+	access_unit.annexb_bytes = {0x00, 0x00, 0x00, 0x01, 0x09, 0x10};
+	if (auto write = sink->write_access_unit(access_unit); !write) {
+		spdlog::error("failed to write video access unit: {}", write.error());
+		return exit_code(TesterExitCode::WriteError);
+	}
+
+	const float depth_mm_pixels[4] = {
+		1000.0f,
+		2000.0f,
+		std::numeric_limits<float>::quiet_NaN(),
+		0.0f,
+	};
+	cvmmap_streamer::record::RawDepthMapView depth_mm{};
+	depth_mm.timestamp_ns = 11;
+	depth_mm.width = 2;
+	depth_mm.height = 2;
+	depth_mm.source_unit = cvmmap_streamer::ipc::DepthUnit::Millimeter;
+	depth_mm.pixels = depth_mm_pixels;
+	if (auto write = sink->write_depth_map(depth_mm); !write) {
+		spdlog::error("failed to write millimeter depth map: {}", write.error());
+		return exit_code(TesterExitCode::WriteError);
+	}
+
+	const float depth_m_pixels[4] = {
+		1.0f,
+		2.0f,
+		std::numeric_limits<float>::quiet_NaN(),
+		0.0f,
+	};
+	cvmmap_streamer::record::RawDepthMapView depth_m{};
+	depth_m.timestamp_ns = 12;
+	depth_m.width = 2;
+	depth_m.height = 2;
+	depth_m.source_unit = cvmmap_streamer::ipc::DepthUnit::Meter;
+	depth_m.pixels = depth_m_pixels;
+	if (auto write = sink->write_depth_map(depth_m); !write) {
+		spdlog::error("failed to write meter depth map: {}", write.error());
+		return exit_code(TesterExitCode::WriteError);
+	}
+
+	sink->close();
+
+	mcap::McapReader reader{};
+	const auto open_status = reader.open(output_path.string());
+	if (!open_status.ok()) {
+		spdlog::error("failed to open MCAP file '{}': {}", output_path.string(), open_status.message);
+		return exit_code(TesterExitCode::OpenError);
+	}
+
+	std::uint64_t video_messages{0};
+	std::vector<cvmmap_streamer::DepthMap> depth_messages{};
+
+	auto messages = reader.readMessages();
+	for (auto it = messages.begin(); it != messages.end(); ++it) {
+		if (it->schema == nullptr || it->channel == nullptr) {
+			spdlog::error("MCAP message missing schema or channel");
+			reader.close();
+			return exit_code(TesterExitCode::VerificationError);
+		}
+		if (it->schema->encoding != "protobuf" || it->channel->messageEncoding != "protobuf") {
+			spdlog::error("unexpected schema encoding in MCAP file");
+			reader.close();
+			return exit_code(TesterExitCode::VerificationError);
+		}
+
+		if (it->schema->name == "foxglove.CompressedVideo") {
+			foxglove::CompressedVideo video{};
+			if (!video.ParseFromArray(it->message.data, static_cast<int>(it->message.dataSize))) {
+				spdlog::error("failed to parse foxglove.CompressedVideo payload");
+				reader.close();
+				return exit_code(TesterExitCode::VerificationError);
+			}
+			if (it->channel->topic != "/camera/video" || video.frame_id() != "camera" || video.data().empty()) {
+				spdlog::error("video MCAP payload verification failed");
+				reader.close();
+				return exit_code(TesterExitCode::VerificationError);
+			}
+			video_messages += 1;
+			continue;
+		}
+
+		if (it->schema->name == "cvmmap_streamer.DepthMap") {
+			cvmmap_streamer::DepthMap depth{};
+			if (!depth.ParseFromArray(it->message.data, static_cast<int>(it->message.dataSize))) {
+				spdlog::error("failed to parse cvmmap_streamer.DepthMap payload");
+				reader.close();
+				return exit_code(TesterExitCode::VerificationError);
+			}
+			if (it->channel->topic != "/camera/depth" || depth.frame_id() != "camera") {
+				spdlog::error("depth MCAP payload verification failed");
+				reader.close();
+				return exit_code(TesterExitCode::VerificationError);
+			}
+			depth_messages.push_back(std::move(depth));
+		}
+	}
+
+	reader.close();
+
+	if (video_messages != 1 || depth_messages.size() != 2) {
+		spdlog::error(
+			"unexpected message counts: video={} depth={}",
+			video_messages,
+			depth_messages.size());
+		return exit_code(TesterExitCode::VerificationError);
+	}
+
+	const auto &mm_message = depth_messages[0];
+	if (mm_message.source_unit() != cvmmap_streamer::DepthMap::DEPTH_UNIT_MILLIMETER ||
+		mm_message.storage_unit() != cvmmap_streamer::DepthMap::STORAGE_UNIT_MILLIMETER ||
+		mm_message.encoding() != cvmmap_streamer::DepthMap::RVL_U16_LOSSLESS) {
+		spdlog::error("millimeter depth metadata verification failed");
+		return exit_code(TesterExitCode::VerificationError);
+	}
+	const auto mm_info = rvl::inspect_image(std::span<const std::uint8_t>(
+		reinterpret_cast<const std::uint8_t *>(mm_message.data().data()),
+		mm_message.data().size()));
+	const auto mm_decoded = rvl::decompress_image(std::span<const std::uint8_t>(
+		reinterpret_cast<const std::uint8_t *>(mm_message.data().data()),
+		mm_message.data().size()));
+	if (mm_info.format != rvl::ImageFormat::UInt16Lossless ||
+		mm_info.rows != 2 ||
+		mm_info.cols != 2 ||
+		mm_decoded.pixels.size() != 4 ||
+		mm_decoded.pixels[0] != 1000 ||
+		mm_decoded.pixels[1] != 2000 ||
+		mm_decoded.pixels[2] != 0 ||
+		mm_decoded.pixels[3] != 0) {
+		spdlog::error("millimeter RVL round-trip verification failed");
+		return exit_code(TesterExitCode::VerificationError);
+	}
+
+	const auto &m_message = depth_messages[1];
+	if (m_message.source_unit() != cvmmap_streamer::DepthMap::DEPTH_UNIT_METER ||
+		m_message.storage_unit() != cvmmap_streamer::DepthMap::STORAGE_UNIT_METER ||
+		m_message.encoding() != cvmmap_streamer::DepthMap::RVL_F32) {
+		spdlog::error("meter depth metadata verification failed");
+		return exit_code(TesterExitCode::VerificationError);
+	}
+	const auto m_info = rvl::inspect_image(std::span<const std::uint8_t>(
+		reinterpret_cast<const std::uint8_t *>(m_message.data().data()),
+		m_message.data().size()));
+	const auto m_decoded = rvl::decompress_float_image(std::span<const std::uint8_t>(
+		reinterpret_cast<const std::uint8_t *>(m_message.data().data()),
+		m_message.data().size()));
+	if (m_info.format != rvl::ImageFormat::Float32InverseDepth ||
+		m_info.rows != 2 ||
+		m_info.cols != 2 ||
+		m_decoded.pixels.size() != 4 ||
+		!approx_equal(m_decoded.pixels[0], 1.0f, 0.02f) ||
+		!approx_equal(m_decoded.pixels[1], 2.0f, 0.02f) ||
+		!std::isnan(m_decoded.pixels[2]) ||
+		!std::isnan(m_decoded.pixels[3])) {
+		spdlog::error("meter RVL round-trip verification failed");
+		return exit_code(TesterExitCode::VerificationError);
+	}
+
+	spdlog::info(
+		"validated same-file MCAP video+depth recording at '{}'",
+		output_path.string());
+	return exit_code(TesterExitCode::Success);
+}

src/testers/mcap_reader_tester.cpp

@@ -1,4 +1,3 @@
-#define MCAP_IMPLEMENTATION
 #include <mcap/reader.hpp>
 
 #include <foxglove/CompressedVideo.pb.h>

src/testers/mcap_replay_tester.cpp

@@ -1,4 +1,3 @@
-#define MCAP_IMPLEMENTATION
 #include <mcap/reader.hpp>
 
 #include <foxglove/CompressedVideo.pb.h>