feat(downstream): add cvmmap downstream runtime implementation
This commit introduces the full downstream runtime implementation needed to ingest, transform, and publish streams. It preserves the original upstream request boundary by packaging the entire cvmmap-streamer module (build config, public API, protocol and IPC glue, and simulator/tester entrypoints) in one coherent core unit. Keeping this group isolated enables reviewers to validate runtime behavior and correctness without mixing test evidence or process documentation changes. Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
This commit is contained in:
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#include <array>
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#include <cerrno>
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#include <chrono>
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#include <cstddef>
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#include <cstdint>
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#include <cstdlib>
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#include <cstring>
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#include <expected>
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#include <fstream>
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#include <optional>
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#include <sstream>
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#include <string>
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#include <string_view>
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#include <thread>
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#include <vector>
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#include <netinet/in.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <spdlog/spdlog.h>
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#include "cvmmap_streamer/common.h"
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namespace {
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// RFC3550 RTP header constants
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constexpr std::size_t kRtpHeaderMinSize = 12;
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constexpr std::uint8_t kRtpVersion = 2;
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constexpr std::uint8_t kRtpVersionMask = 0xC0;
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constexpr std::uint8_t kRtpVersionShift = 6;
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constexpr std::uint8_t kRtpPaddingMask = 0x20;
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constexpr std::uint8_t kRtpExtensionMask = 0x10;
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constexpr std::uint8_t kRtpCsrcCountMask = 0x0F;
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constexpr std::uint8_t kRtpMarkerMask = 0x80;
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constexpr std::uint8_t kRtpPayloadTypeMask = 0x7F;
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// RTP header structure (RFC3550)
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struct RtpHeader {
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std::uint8_t version; // 2 bits
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bool padding; // 1 bit
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bool extension; // 1 bit
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std::uint8_t csrcCount; // 4 bits
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bool marker; // 1 bit
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std::uint8_t payloadType; // 7 bits
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std::uint16_t sequence; // 16 bits
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std::uint32_t timestamp; // 32 bits
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std::uint32_t ssrc; // 32 bits
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};
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// Parsed SDP media info
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struct SdpMediaInfo {
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std::string encodingName;
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std::uint32_t clockRate = 0;
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std::uint8_t payloadType = 0;
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bool hasH264 = false;
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bool hasH265 = false;
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};
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// Test configuration
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struct Config {
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std::uint16_t port = 5004;
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std::optional<std::uint8_t> expectedPt;
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std::optional<std::string> sdpFile;
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std::optional<std::string> decodeHook;
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std::uint32_t packetThreshold = 10;
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std::uint32_t timeoutMs = 5000;
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bool verbose = false;
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};
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// Test statistics
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struct Stats {
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std::uint32_t packetsReceived = 0;
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std::uint32_t sequenceGaps = 0;
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std::uint32_t invalidPackets = 0;
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std::uint16_t lastSequence = 0;
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std::uint8_t detectedPt = 0;
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bool hasSeenPacket = false;
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std::optional<std::uint8_t> ptMismatchError;
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};
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// Parse RTP header from buffer
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std::optional<RtpHeader> parseRtpHeader(std::span<const std::uint8_t> data) {
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if (data.size() < kRtpHeaderMinSize) {
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return std::nullopt;
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}
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RtpHeader header{};
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header.version = (data[0] & kRtpVersionMask) >> kRtpVersionShift;
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header.padding = (data[0] & kRtpPaddingMask) != 0;
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header.extension = (data[0] & kRtpExtensionMask) != 0;
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header.csrcCount = data[0] & kRtpCsrcCountMask;
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header.marker = (data[1] & kRtpMarkerMask) != 0;
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header.payloadType = data[1] & kRtpPayloadTypeMask;
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header.sequence = static_cast<std::uint16_t>(data[2]) << 8 | data[3];
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header.timestamp = static_cast<std::uint32_t>(data[4]) << 24 |
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static_cast<std::uint32_t>(data[5]) << 16 |
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static_cast<std::uint32_t>(data[6]) << 8 | data[7];
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header.ssrc = static_cast<std::uint32_t>(data[8]) << 24 |
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static_cast<std::uint32_t>(data[9]) << 16 |
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static_cast<std::uint32_t>(data[10]) << 8 | data[11];
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return header;
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}
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// Parse SDP file for media information
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std::optional<SdpMediaInfo> parseSdpFile(std::string_view path) {
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std::string pathStr(path);
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std::ifstream file(pathStr);
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if (!file.is_open()) {
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spdlog::error("Failed to open SDP file: {}", path);
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return std::nullopt;
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}
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SdpMediaInfo info;
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std::string line;
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bool inMediaSection = false;
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while (std::getline(file, line)) {
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// Remove trailing \r if present
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if (!line.empty() && line.back() == '\r') {
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line.pop_back();
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}
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if (line.starts_with("m=")) {
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inMediaSection = true;
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// Parse media line: m=<media> <port> <proto> <pt>
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// e.g., m=video 5004 RTP/AVP 96
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std::istringstream iss(line);
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std::string mediaType, port, proto;
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int pt = 0;
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// Skip "m=" prefix
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if (line.size() > 2 && iss.seekg(2) && std::getline(iss, mediaType, ' ')) {
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if (iss >> port >> proto >> pt) {
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info.payloadType = static_cast<std::uint8_t>(pt);
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}
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}
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} else if (inMediaSection && line.starts_with("a=rtpmap:")) {
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// Parse rtpmap: a=rtpmap:<pt> <encoding>/<clockrate>
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// e.g., a=rtpmap:96 H264/90000
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size_t ptEnd = line.find(' ', 9);
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if (ptEnd != std::string::npos) {
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size_t slashPos = line.find('/', ptEnd + 1);
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if (slashPos != std::string::npos) {
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info.encodingName = line.substr(ptEnd + 1, slashPos - ptEnd - 1);
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info.clockRate = std::stoul(line.substr(slashPos + 1));
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}
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}
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if (info.encodingName == "H264") {
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info.hasH264 = true;
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} else if (info.encodingName == "H265" || info.encodingName == "HEVC") {
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info.hasH265 = true;
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}
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}
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}
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return info;
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}
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// Create UDP socket and bind to port
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std::expected<int, std::string> createUdpSocket(std::uint16_t port) {
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int sock = socket(AF_INET, SOCK_DGRAM, 0);
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if (sock < 0) {
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return std::unexpected(std::format("socket failed: {}", std::strerror(errno)));
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}
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int reuse = 1;
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if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) < 0) {
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close(sock);
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return std::unexpected(std::format("setsockopt failed: {}", std::strerror(errno)));
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}
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sockaddr_in addr{};
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addr.sin_family = AF_INET;
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addr.sin_port = htons(port);
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addr.sin_addr.s_addr = INADDR_ANY;
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if (bind(sock, reinterpret_cast<sockaddr *>(&addr), sizeof(addr)) < 0) {
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close(sock);
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return std::unexpected(std::format("bind failed: {}", std::strerror(errno)));
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}
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return sock;
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}
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// Parse command-line arguments
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std::expected<Config, std::string> parseArgs(int argc, char **argv) {
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Config config;
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for (int i = 1; i < argc; ++i) {
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std::string_view arg(argv[i]);
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if (arg == "--help" || arg == "-h") {
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return std::unexpected("help");
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} else if (arg == "--port" && i + 1 < argc) {
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config.port = static_cast<std::uint16_t>(std::stoul(argv[++i]));
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} else if (arg == "--expect-pt" && i + 1 < argc) {
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config.expectedPt = static_cast<std::uint8_t>(std::stoul(argv[++i]));
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} else if (arg == "--sdp" && i + 1 < argc) {
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config.sdpFile = argv[++i];
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} else if (arg == "--decode-hook" && i + 1 < argc) {
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config.decodeHook = argv[++i];
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} else if (arg == "--packet-threshold" && i + 1 < argc) {
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config.packetThreshold = std::stoul(argv[++i]);
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} else if (arg == "--timeout-ms" && i + 1 < argc) {
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config.timeoutMs = std::stoul(argv[++i]);
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} else if (arg == "--verbose" || arg == "-v") {
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config.verbose = true;
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}
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}
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return config;
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}
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// Print usage
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void printRtpReceiverUsage() {
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spdlog::info("rtp_receiver_tester - UDP RTP packet receiver and validator");
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spdlog::info("");
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spdlog::info("Usage:");
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spdlog::info(" rtp_receiver_tester [options]");
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spdlog::info("");
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spdlog::info("Options:");
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spdlog::info(" --port <num> UDP port to listen on (default: 5004)");
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spdlog::info(" --expect-pt <num> Expected payload type (0-127)");
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spdlog::info(" --sdp <path> SDP file to validate against");
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spdlog::info(" --decode-hook <cmd> Optional command to validate payload");
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spdlog::info(" --packet-threshold <n> Minimum packets to consider success (default: 10)");
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spdlog::info(" --timeout-ms <ms> Max time to wait for packets (default: 5000)");
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spdlog::info(" --verbose, -v Enable verbose logging");
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spdlog::info(" --help, -h Show this message");
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spdlog::info("");
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spdlog::info("Examples:");
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spdlog::info(" rtp_receiver_tester --port 5004 --expect-pt 96");
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spdlog::info(" rtp_receiver_tester --port 5004 --sdp /tmp/stream.sdp");
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spdlog::info("");
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spdlog::info("Exit codes:");
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spdlog::info(" 0 Success (packets received, PT matches)");
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spdlog::info(" 1 Invalid arguments");
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spdlog::info(" 2 Socket/bind error");
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spdlog::info(" 3 Payload type mismatch");
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spdlog::info(" 4 Packet threshold not met");
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spdlog::info(" 5 SDP validation failed");
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spdlog::info(" 6 Decode hook failed");
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}
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// Run optional decode hook
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bool runDecodeHook(std::string_view hookCmd, std::span<const std::uint8_t> payload) {
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if (hookCmd.empty()) {
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return true;
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}
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pid_t pid = fork();
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if (pid < 0) {
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spdlog::error("fork failed for decode hook");
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return false;
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}
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if (pid == 0) {
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// Child process - execute hook
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// Write payload to stdin of hook command
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// For simplicity, use a temp file approach or pipe
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// Here we use execlp with the command
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execlp("sh", "sh", "-c", std::string(hookCmd).c_str(), nullptr);
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_exit(127);
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}
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// Parent - wait for child with timeout
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int status = 0;
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int waitResult = waitpid(pid, &status, WNOHANG);
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// Simple non-blocking check - if not ready, we continue
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// The hook is optional/validation only
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if (waitResult == 0) {
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// Still running, don't block
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spdlog::debug("Decode hook still running (non-blocking)");
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return true;
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}
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if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
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return true;
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}
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spdlog::warn("Decode hook exited with error");
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return false;
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}
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} // namespace
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int main(int argc, char **argv) {
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if (argc <= 1 || cvmmap_streamer::has_help_flag(argc, argv)) {
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printRtpReceiverUsage();
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return (argc <= 1) ? 1 : 0;
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}
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auto configResult = parseArgs(argc, argv);
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if (!configResult) {
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if (configResult.error() == "help") {
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printRtpReceiverUsage();
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return 0;
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}
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spdlog::error("Argument error: {}", configResult.error());
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printRtpReceiverUsage();
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return 1;
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}
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const auto &config = *configResult;
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if (config.verbose) {
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spdlog::set_level(spdlog::level::debug);
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}
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// Parse SDP file if provided
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std::optional<SdpMediaInfo> sdpInfo;
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if (config.sdpFile) {
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sdpInfo = parseSdpFile(*config.sdpFile);
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if (!sdpInfo) {
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spdlog::error("Failed to parse SDP file: {}", *config.sdpFile);
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return 5;
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}
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spdlog::info("SDP parsed: encoding={}, clock-rate={}, PT={}",
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sdpInfo->encodingName,
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sdpInfo->clockRate,
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sdpInfo->payloadType);
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// Cross-validate expected PT with SDP
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if (config.expectedPt && *config.expectedPt != sdpInfo->payloadType) {
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spdlog::error("Expected PT({}) does not match SDP PT({})",
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*config.expectedPt,
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sdpInfo->payloadType);
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return 5;
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}
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}
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// Create UDP socket
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auto sockResult = createUdpSocket(config.port);
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if (!sockResult) {
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spdlog::error("Socket error: {}", sockResult.error());
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return 2;
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}
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int sock = *sockResult;
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spdlog::info("Listening on UDP port {} for RTP packets...", config.port);
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Stats stats;
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auto startTime = std::chrono::steady_clock::now();
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std::vector<std::uint8_t> buffer(65535);
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sockaddr_in clientAddr{};
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socklen_t addrLen = sizeof(clientAddr);
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while (true) {
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// Check timeout
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auto elapsed = std::chrono::steady_clock::now() - startTime;
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if (std::chrono::duration_cast<std::chrono::milliseconds>(elapsed).count() > config.timeoutMs) {
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spdlog::info("Timeout reached after {} ms", config.timeoutMs);
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break;
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}
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// Non-blocking receive with short timeout using select
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fd_set readfds;
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FD_ZERO(&readfds);
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FD_SET(sock, &readfds);
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timeval tv{};
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tv.tv_sec = 0;
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tv.tv_usec = 100000; // 100ms
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int selectResult = select(sock + 1, &readfds, nullptr, nullptr, &tv);
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if (selectResult < 0) {
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spdlog::error("select error: {}", std::strerror(errno));
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break;
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}
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if (selectResult == 0) {
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continue; // Timeout, check overall timeout
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}
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ssize_t received = recvfrom(sock,
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buffer.data(),
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buffer.size(),
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0,
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reinterpret_cast<sockaddr *>(&clientAddr),
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&addrLen);
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if (received < 0) {
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if (errno == EAGAIN || errno == EWOULDBLOCK) {
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continue;
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}
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spdlog::error("recvfrom error: {}", std::strerror(errno));
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break;
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}
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// Parse RTP header
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auto headerOpt = parseRtpHeader(std::span(buffer.data(), received));
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if (!headerOpt) {
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spdlog::warn("Received invalid packet (too small)");
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stats.invalidPackets++;
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continue;
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}
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const auto &header = *headerOpt;
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// Validate RTP version
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if (header.version != kRtpVersion) {
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spdlog::warn("Invalid RTP version: {} (expected {})", header.version, kRtpVersion);
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stats.invalidPackets++;
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continue;
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}
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stats.packetsReceived++;
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// Track sequence gaps
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if (stats.hasSeenPacket) {
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std::uint16_t expectedSeq = stats.lastSequence + 1;
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if (header.sequence != expectedSeq) {
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std::uint16_t gap = header.sequence - expectedSeq;
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stats.sequenceGaps += gap;
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if (config.verbose) {
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spdlog::debug("Sequence gap detected: expected {}, got {} (gap size: {})",
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expectedSeq,
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header.sequence,
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gap);
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}
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}
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}
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stats.lastSequence = header.sequence;
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stats.hasSeenPacket = true;
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stats.detectedPt = header.payloadType;
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// Validate payload type if expected
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if (config.expectedPt && header.payloadType != *config.expectedPt) {
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spdlog::error("Payload type mismatch: expected {}, got {}",
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*config.expectedPt,
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header.payloadType);
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stats.ptMismatchError = header.payloadType;
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}
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// Log packet info
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if (config.verbose) {
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spdlog::debug("Packet {}: PT={}, seq={}, ts={}, ssrc=0x{:08X}, marker={}",
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stats.packetsReceived,
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header.payloadType,
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header.sequence,
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header.timestamp,
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header.ssrc,
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header.marker);
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}
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// Run optional decode hook
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if (config.decodeHook && !stats.ptMismatchError) {
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std::size_t headerSize = kRtpHeaderMinSize + (header.csrcCount * 4);
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if (header.extension) {
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// Skip extension header if present
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if (received >= headerSize + 4) {
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std::uint16_t extLength = static_cast<std::uint16_t>(buffer[headerSize + 2]) << 8 |
|
||||
buffer[headerSize + 3];
|
||||
headerSize += 4 + (extLength * 4);
|
||||
}
|
||||
}
|
||||
if (received > static_cast<ssize_t>(headerSize)) {
|
||||
auto payload = std::span(buffer.data() + headerSize, received - headerSize);
|
||||
if (!runDecodeHook(*config.decodeHook, payload)) {
|
||||
spdlog::warn("Decode hook validation failed");
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Check if we've received enough packets
|
||||
if (stats.packetsReceived >= config.packetThreshold) {
|
||||
spdlog::info("Packet threshold reached ({} packets)", config.packetThreshold);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
close(sock);
|
||||
|
||||
// Print summary
|
||||
spdlog::info("");
|
||||
spdlog::info("=== RTP Receiver Statistics ===");
|
||||
spdlog::info("Packets received: {}", stats.packetsReceived);
|
||||
spdlog::info("Sequence gaps: {}", stats.sequenceGaps);
|
||||
spdlog::info("Invalid packets: {}", stats.invalidPackets);
|
||||
if (stats.hasSeenPacket) {
|
||||
spdlog::info("Detected payload type: {}", stats.detectedPt);
|
||||
}
|
||||
|
||||
// Determine exit code
|
||||
if (stats.ptMismatchError) {
|
||||
spdlog::error("FAIL: Payload type mismatch detected (expected {}, got {})",
|
||||
config.expectedPt.value(),
|
||||
*stats.ptMismatchError);
|
||||
return 3;
|
||||
}
|
||||
|
||||
if (stats.packetsReceived < config.packetThreshold) {
|
||||
spdlog::error("FAIL: Packet threshold not met (received {}, required {})",
|
||||
stats.packetsReceived,
|
||||
config.packetThreshold);
|
||||
return 4;
|
||||
}
|
||||
|
||||
spdlog::info("PASS: All validations successful");
|
||||
return 0;
|
||||
}
|
||||
Reference in New Issue
Block a user