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59e08fd2d6d6c5da301ca91ddbdba8622d9bcdb1
iptvnator/apps/electron-backend/native/helper/mpv_frame_helper.cpp
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4gray 59e08fd2d6 feat(embedded-mpv): add Windows frame-copy support (#1175) 
Port the embedded mpv frame-copy pipeline to Windows with WGL rendering and named shared memory. Includes packaging validation, platform gates, tests, and architecture documentation.
2026-07-15 21:27:56 +02:00

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/*
* iptvnator-mpv-helper — frame-copy embedded MPV helper process
* (macOS + Linux + Windows; platform GL context in frame_helper_gl.h).
*
* One process = one playback session. Owns libmpv end to end: decodes,
* renders offscreen at viewport size, publishes BGRA frames into a shared
* memory ring (frame_shm.h), and plays audio directly through the OS.
*
* Control protocol: tab-separated commands on stdin, JSON events on stdout
* (see frame_helper_io.h). The `snapshot` event mirrors the TypeScript
* NativeEmbeddedMpvSessionSnapshot shape so the Electron-side adapter can
* cache it verbatim. Status semantics are ported from embedded_mpv.mm:
* END_FILE reason mapping, eof-reached => ended (keep-open), pause flag
* gated on a loaded path, only fatal/load errors flip the status.
*
* Usage:
* iptvnator_mpv_helper --shm-base /impv-<id> --width 1280 --height 720
* [--volume 0..1] [--hwdec auto]
*/
#include <mpv/client.h>
#include <algorithm>
#include <atomic>
#include <clocale>
#include <cmath>
#include <csignal>
#include <cstdio>
#include <cstring>
#include <ctime>
#include <iostream>
#include <mutex>
#include <string>
#include <thread>
#include <utility>
#include <vector>
#include "frame_helper_io.h"
#include "frame_helper_render.h"
namespace {
using frame_helper::Command;
using frame_helper::emitLine;
using frame_helper::JsonWriter;
using frame_helper::RenderPipeline;
struct TrackInfo {
int64_t id = -1;
std::string title;
std::string language;
bool defaultTrack = false;
bool forced = false;
};
struct SnapshotState {
std::string status = "idle";
double positionSeconds = 0;
double durationSeconds = -1; /* <0 => null */
double volume = 1; /* 0..1 */
int64_t videoWidth = 0; /* mpv dwidth/dheight; 0 = unknown */
int64_t videoHeight = 0;
std::string streamUrl;
std::vector<TrackInfo> audioTracks;
int64_t selectedAudioTrackId = -1;
std::vector<TrackInfo> subtitleTracks;
int64_t selectedSubtitleTrackId = -1;
double playbackSpeed = 1;
std::string aspectOverride = "no";
bool recordingActive = false;
std::string recordingTargetPath;
std::string recordingStartedAt;
std::string recordingError;
std::string error;
};
struct HelperState {
mpv_handle* mpv = nullptr;
RenderPipeline pipeline;
std::mutex mutex;
SnapshotState snapshot;
bool paused = false;
bool loadedPath = false;
bool dirty = true;
std::string lastEmittedStatus;
uint64_t lastEmitNs = 0;
/* Requested viewport in device pixels; the render target is the
* aspect-fit of the video inside it so letterbox bars are never
* rendered (and frames stay as small as possible). */
int viewportWidth = 0;
int viewportHeight = 0;
std::atomic<bool> running{true};
};
HelperState g_state;
constexpr uint64_t SNAPSHOT_EMIT_INTERVAL_NS = 250ull * 1000 * 1000;
std::string isoTimestampNow() {
char buffer[32];
const time_t now = time(nullptr);
struct tm utc;
#if defined(_WIN32)
gmtime_s(&utc, &now);
#else
gmtime_r(&now, &utc);
#endif
strftime(buffer, sizeof(buffer), "%Y-%m-%dT%H:%M:%SZ", &utc);
return buffer;
}
std::string tracksJson(const std::vector<TrackInfo>& tracks,
int64_t selectedId) {
std::string out = "[";
bool first = true;
for (const TrackInfo& track : tracks) {
JsonWriter writer;
writer.num("id", (double)track.id);
if (!track.title.empty()) writer.str("title", track.title);
if (!track.language.empty()) writer.str("language", track.language);
writer.boolean("selected", track.id == selectedId);
writer.boolean("defaultTrack", track.defaultTrack);
writer.boolean("forced", track.forced);
if (!first) out += ',';
first = false;
out += writer.finish();
}
out += ']';
return out;
}
/* Compose the snapshot event. Caller holds g_state.mutex. */
std::string composeSnapshotLocked() {
const SnapshotState& s = g_state.snapshot;
JsonWriter writer;
writer.str("event", "snapshot");
writer.str("status", s.status);
writer.num("positionSeconds", std::max(0.0, s.positionSeconds));
if (s.videoWidth > 0 && s.videoHeight > 0) {
writer.num("videoWidth", (double)s.videoWidth);
writer.num("videoHeight", (double)s.videoHeight);
}
if (s.durationSeconds >= 0) {
writer.num("durationSeconds", s.durationSeconds);
} else {
writer.nullValue("durationSeconds");
}
writer.num("volume", std::clamp(s.volume, 0.0, 1.5));
writer.str("streamUrl", s.streamUrl);
writer.raw("audioTracks", tracksJson(s.audioTracks, s.selectedAudioTrackId));
if (s.selectedAudioTrackId >= 0) {
writer.num("selectedAudioTrackId", (double)s.selectedAudioTrackId);
} else {
writer.nullValue("selectedAudioTrackId");
}
writer.raw("subtitleTracks",
tracksJson(s.subtitleTracks, s.selectedSubtitleTrackId));
if (s.selectedSubtitleTrackId >= 0) {
writer.num("selectedSubtitleTrackId",
(double)s.selectedSubtitleTrackId);
} else {
writer.nullValue("selectedSubtitleTrackId");
}
writer.num("playbackSpeed", s.playbackSpeed);
writer.str("aspectOverride", s.aspectOverride);
JsonWriter recording;
recording.boolean("active", s.recordingActive);
if (!s.recordingTargetPath.empty())
recording.str("targetPath", s.recordingTargetPath);
if (!s.recordingStartedAt.empty())
recording.str("startedAt", s.recordingStartedAt);
if (!s.recordingError.empty()) recording.str("error", s.recordingError);
writer.raw("recording", recording.finish());
if (!s.error.empty()) writer.str("error", s.error);
return writer.finish();
}
/* Emit the snapshot when dirty: immediately on status changes, otherwise at
* most every SNAPSHOT_EMIT_INTERVAL_NS. Called from the mpv event thread. */
void maybeEmitSnapshot(bool force = false) {
std::string line;
{
std::lock_guard<std::mutex> lock(g_state.mutex);
if (!g_state.dirty && !force) return;
const uint64_t now = frame_helper::nowNs();
const bool statusChanged =
g_state.snapshot.status != g_state.lastEmittedStatus;
if (!force && !statusChanged &&
now - g_state.lastEmitNs < SNAPSHOT_EMIT_INTERVAL_NS) {
return;
}
g_state.dirty = false;
g_state.lastEmitNs = now;
g_state.lastEmittedStatus = g_state.snapshot.status;
line = composeSnapshotLocked();
}
emitLine(line);
}
void markDirtyLocked() { g_state.dirty = true; }
/* Aspect-fit of the current video inside the requested viewport. Caller
* holds g_state.mutex. Letterbox bars are handled by the renderer layout,
* not baked into frames. */
std::pair<int, int> computeRenderSizeLocked() {
const int vpW = g_state.viewportWidth;
const int vpH = g_state.viewportHeight;
const int64_t vw = g_state.snapshot.videoWidth;
const int64_t vh = g_state.snapshot.videoHeight;
if (vw < 16 || vh < 16 || vpW < 16 || vpH < 16) {
return {vpW, vpH};
}
const double scale =
std::min(vpW / (double)vw, vpH / (double)vh);
const int width =
std::max(16, (int)llround((double)vw * scale)) & ~1;
const int height =
std::max(16, (int)llround((double)vh * scale)) & ~1;
return {width, height};
}
void applyRenderSizeLocked() {
const auto [width, height] = computeRenderSizeLocked();
if (width >= 16 && height >= 16) {
g_state.pipeline.requestResize(width, height);
}
}
/* ---- track-list parsing (ported from embedded_mpv.mm) ------------------- */
void parseTrackNode(const mpv_node& trackNode, const char* wantedType,
std::vector<TrackInfo>& out) {
if (trackNode.format != MPV_FORMAT_NODE_MAP || !trackNode.u.list) return;
TrackInfo track;
bool matchesType = false;
const mpv_node_list& map = *trackNode.u.list;
for (int i = 0; i < map.num; i++) {
const char* key = map.keys[i];
const mpv_node& value = map.values[i];
if (!key) continue;
if (std::strcmp(key, "type") == 0 &&
value.format == MPV_FORMAT_STRING && value.u.string) {
matchesType = std::strcmp(value.u.string, wantedType) == 0;
} else if (std::strcmp(key, "id") == 0 &&
value.format == MPV_FORMAT_INT64) {
track.id = value.u.int64;
} else if (std::strcmp(key, "title") == 0 &&
value.format == MPV_FORMAT_STRING && value.u.string) {
track.title = value.u.string;
} else if (std::strcmp(key, "lang") == 0 &&
value.format == MPV_FORMAT_STRING && value.u.string) {
track.language = value.u.string;
} else if (std::strcmp(key, "default") == 0 &&
value.format == MPV_FORMAT_FLAG) {
track.defaultTrack = value.u.flag != 0;
} else if (std::strcmp(key, "forced") == 0 &&
value.format == MPV_FORMAT_FLAG) {
track.forced = value.u.flag != 0;
}
}
if (matchesType && track.id >= 0) {
out.push_back(std::move(track));
}
}
void updateTracksFromNode(const mpv_node& trackListNode) {
if (trackListNode.format != MPV_FORMAT_NODE_ARRAY ||
!trackListNode.u.list) {
return;
}
std::vector<TrackInfo> audio;
std::vector<TrackInfo> subs;
for (int i = 0; i < trackListNode.u.list->num; i++) {
parseTrackNode(trackListNode.u.list->values[i], "audio", audio);
parseTrackNode(trackListNode.u.list->values[i], "sub", subs);
}
g_state.snapshot.audioTracks = std::move(audio);
g_state.snapshot.subtitleTracks = std::move(subs);
}
bool parseTrackSelection(const char* value, int64_t& out) {
if (!value) return false;
char* end = nullptr;
const long long parsed = strtoll(value, &end, 10);
if (end == value || (end && *end != '\0')) return false;
out = parsed;
return true;
}
/* ---- mpv event loop (status semantics ported from embedded_mpv.mm) ------ */
void handlePropertyChange(const mpv_event_property& property) {
const std::string name = property.name ? property.name : "";
SnapshotState& s = g_state.snapshot;
if (name == "time-pos" && property.format == MPV_FORMAT_DOUBLE &&
property.data) {
s.positionSeconds = *static_cast<double*>(property.data);
} else if (name == "duration" && property.format == MPV_FORMAT_DOUBLE &&
property.data) {
s.durationSeconds = *static_cast<double*>(property.data);
} else if (name == "pause" && property.format == MPV_FORMAT_FLAG &&
property.data) {
g_state.paused = *static_cast<int*>(property.data) != 0;
if (s.status != "loading" && s.status != "ended" &&
s.status != "error" && g_state.loadedPath) {
s.status = g_state.paused ? "paused" : "playing";
}
} else if (name == "eof-reached" && property.format == MPV_FORMAT_FLAG &&
property.data) {
if (*static_cast<int*>(property.data) != 0 && g_state.loadedPath) {
s.status = "ended";
}
} else if (name == "volume" && property.format == MPV_FORMAT_DOUBLE &&
property.data) {
s.volume = *static_cast<double*>(property.data) / 100.0;
} else if (name == "path" && property.format == MPV_FORMAT_STRING &&
property.data) {
const char* value = *static_cast<char**>(property.data);
s.streamUrl = value ? value : "";
} else if (name == "track-list" && property.format == MPV_FORMAT_NODE &&
property.data) {
updateTracksFromNode(*static_cast<mpv_node*>(property.data));
} else if (name == "aid" && property.format == MPV_FORMAT_STRING &&
property.data) {
int64_t selected = -1;
if (parseTrackSelection(*static_cast<char**>(property.data),
selected)) {
s.selectedAudioTrackId = selected;
} else {
s.selectedAudioTrackId = -1;
}
} else if (name == "sid" && property.format == MPV_FORMAT_STRING &&
property.data) {
int64_t selected = -1;
if (parseTrackSelection(*static_cast<char**>(property.data),
selected)) {
s.selectedSubtitleTrackId = selected;
} else {
s.selectedSubtitleTrackId = -1;
}
} else if (name == "speed" && property.format == MPV_FORMAT_DOUBLE &&
property.data) {
s.playbackSpeed = *static_cast<double*>(property.data);
} else if ((name == "dwidth" || name == "dheight") &&
property.format == MPV_FORMAT_INT64 && property.data) {
const int64_t value = *static_cast<int64_t*>(property.data);
if (name == "dwidth") {
s.videoWidth = value;
} else {
s.videoHeight = value;
}
applyRenderSizeLocked();
} else if (name == "video-aspect-override" &&
property.format == MPV_FORMAT_STRING && property.data) {
const char* value = *static_cast<char**>(property.data);
/* mpv reports the unset override as "-1.000000"; the renderer
* contract uses "no" for that state. */
s.aspectOverride =
value && *value && std::atof(value) > 0 ? value : "no";
} else {
return;
}
markDirtyLocked();
}
void runMpvEventLoop() {
while (g_state.running.load()) {
mpv_event* event = mpv_wait_event(g_state.mpv, 0.1);
if (!event) continue;
if (event->event_id == MPV_EVENT_NONE) {
maybeEmitSnapshot();
continue;
}
{
std::lock_guard<std::mutex> lock(g_state.mutex);
SnapshotState& s = g_state.snapshot;
switch (event->event_id) {
case MPV_EVENT_START_FILE:
s.status = "loading";
s.error.clear();
s.audioTracks.clear();
s.selectedAudioTrackId = -1;
s.subtitleTracks.clear();
s.selectedSubtitleTrackId = -1;
g_state.loadedPath = false;
markDirtyLocked();
break;
case MPV_EVENT_FILE_LOADED:
g_state.loadedPath = true;
s.status = g_state.paused ? "paused" : "playing";
markDirtyLocked();
break;
case MPV_EVENT_END_FILE: {
const auto* endFile =
static_cast<mpv_event_end_file*>(event->data);
if (endFile &&
endFile->reason == MPV_END_FILE_REASON_ERROR) {
s.status = "error";
s.error = endFile->error < 0
? mpv_error_string(endFile->error)
: "Playback failed.";
} else if (endFile &&
endFile->reason == MPV_END_FILE_REASON_EOF &&
g_state.running.load()) {
s.status = "ended";
} else if (endFile &&
endFile->reason ==
MPV_END_FILE_REASON_REDIRECT &&
g_state.running.load()) {
s.status = "loading";
s.error.clear();
g_state.loadedPath = false;
} else if (g_state.running.load()) {
s.status = "idle";
}
markDirtyLocked();
break;
}
case MPV_EVENT_PROPERTY_CHANGE: {
const auto* property =
static_cast<mpv_event_property*>(event->data);
if (property) handlePropertyChange(*property);
break;
}
case MPV_EVENT_LOG_MESSAGE: {
const auto* logMessage =
static_cast<mpv_event_log_message*>(event->data);
if (!logMessage || !logMessage->level ||
!logMessage->text) {
break;
}
const std::string level = logMessage->level;
if (level == "error" || level == "fatal") {
s.error = logMessage->text;
markDirtyLocked();
}
if (level == "fatal") {
s.status = "error";
}
emitLine(JsonWriter()
.str("event", "log")
.str("level", level)
.str("prefix", logMessage->prefix
? logMessage->prefix
: "mpv")
.str("text", logMessage->text)
.finish());
break;
}
case MPV_EVENT_SHUTDOWN:
g_state.running.store(false);
s.status = "closed";
markDirtyLocked();
break;
default:
break;
}
}
maybeEmitSnapshot();
}
maybeEmitSnapshot(true);
}
/* ---- command handling ---------------------------------------------------- */
void setPropertyString(const char* name, const std::string& value) {
mpv_set_property_string(g_state.mpv, name, value.c_str());
}
void handleLoadCommand(const Command& command) {
const std::string url = command.get("url");
if (url.empty()) return;
/* Loading a replacement stream stops any active recording first,
* mirroring the .mm behavior. */
{
std::lock_guard<std::mutex> lock(g_state.mutex);
if (g_state.snapshot.recordingActive) {
setPropertyString("stream-record", "");
g_state.snapshot.recordingActive = false;
g_state.snapshot.recordingStartedAt.clear();
}
g_state.snapshot.streamUrl = url;
g_state.snapshot.error.clear();
g_state.snapshot.status = "loading";
g_state.dirty = true;
}
/* Generic pass-through: every `opt.<name>` argument becomes a loadfile
* option, so the adapter controls start/user-agent/referrer/headers
* without protocol changes. */
std::string optionString;
for (const auto& [key, value] : command.args) {
if (key.rfind("opt.", 0) != 0 || value.empty()) continue;
if (!optionString.empty()) optionString += ',';
std::string escaped = value;
/* loadfile options string uses %len%value quoting to stay safe */
optionString += key.substr(4) + "=%" +
std::to_string(escaped.size()) + "%" + escaped;
}
const char* args[] = {"loadfile", url.c_str(), "replace",
optionString.empty() ? nullptr : optionString.c_str(),
nullptr};
/* mpv >= 0.38 expects an index argument before options; use the
* options-map-free form: loadfile <url> replace [options] */
int result;
if (optionString.empty()) {
const char* plain[] = {"loadfile", url.c_str(), "replace", nullptr};
result = mpv_command(g_state.mpv, plain);
} else {
const char* withOpts[] = {"loadfile", url.c_str(), "replace", "-1",
optionString.c_str(), nullptr};
result = mpv_command(g_state.mpv, withOpts);
if (result == MPV_ERROR_INVALID_PARAMETER) {
/* Older mpv without the index argument. */
result = mpv_command(g_state.mpv, args);
}
}
if (result < 0) {
std::lock_guard<std::mutex> lock(g_state.mutex);
g_state.snapshot.status = "error";
g_state.snapshot.error = mpv_error_string(result);
g_state.dirty = true;
}
}
void handleRecordCommand(const Command& command) {
const std::string path = command.get("path");
const int result = mpv_set_property_string(g_state.mpv, "stream-record",
path.c_str());
std::lock_guard<std::mutex> lock(g_state.mutex);
if (result < 0) {
g_state.snapshot.recordingError = mpv_error_string(result);
} else if (path.empty()) {
g_state.snapshot.recordingActive = false;
g_state.snapshot.recordingStartedAt.clear();
g_state.snapshot.recordingError.clear();
} else {
g_state.snapshot.recordingActive = true;
g_state.snapshot.recordingTargetPath = path;
g_state.snapshot.recordingStartedAt = isoTimestampNow();
g_state.snapshot.recordingError.clear();
}
g_state.dirty = true;
}
void handleCommand(const Command& command) {
if (command.name == "load") {
handleLoadCommand(command);
} else if (command.name == "pause") {
const int flag = command.get("value") == "1" ? 1 : 0;
mpv_set_property(g_state.mpv, "pause", MPV_FORMAT_FLAG,
const_cast<int*>(&flag));
} else if (command.name == "seek") {
const double seconds = command.getDouble("seconds", 0);
const std::string value = std::to_string(seconds);
const char* args[] = {"seek", value.c_str(), "absolute", nullptr};
mpv_command(g_state.mpv, args);
} else if (command.name == "volume") {
double percent =
std::clamp(command.getDouble("value", 1) * 100.0, 0.0, 100.0);
mpv_set_property(g_state.mpv, "volume", MPV_FORMAT_DOUBLE, &percent);
} else if (command.name == "aid" || command.name == "sid") {
const std::string value = command.get("value");
setPropertyString(command.name.c_str(),
value == "-1" ? "no" : value);
} else if (command.name == "speed") {
double speed = std::clamp(command.getDouble("value", 1), 0.25, 4.0);
mpv_set_property(g_state.mpv, "speed", MPV_FORMAT_DOUBLE, &speed);
} else if (command.name == "aspect") {
setPropertyString("video-aspect-override", command.get("value", "no"));
} else if (command.name == "record") {
handleRecordCommand(command);
} else if (command.name == "size") {
const int width = (int)command.getDouble("width", 0);
const int height = (int)command.getDouble("height", 0);
if (width >= 16 && height >= 16) {
std::lock_guard<std::mutex> lock(g_state.mutex);
g_state.viewportWidth = width;
g_state.viewportHeight = height;
applyRenderSizeLocked();
}
} else if (command.name == "quit") {
g_state.running.store(false);
mpv_wakeup(g_state.mpv);
}
}
void runStdinLoop() {
std::string line;
while (g_state.running.load() && std::getline(std::cin, line)) {
if (line.empty()) continue;
handleCommand(frame_helper::parseCommandLine(line));
}
/* stdin EOF => the parent process died or closed us: shut down. */
g_state.running.store(false);
mpv_wakeup(g_state.mpv);
}
void onRenderUpdate(void* pipeline) {
static_cast<RenderPipeline*>(pipeline)->notifyUpdate();
}
struct HelperArgs {
std::string shmBase = "/impv";
std::string hwdec = "auto";
std::string audioDelay; /* seconds, mpv audio-delay passthrough */
int width = 1280;
int height = 720;
double volume = 1;
};
HelperArgs parseArgs(int argc, char** argv) {
HelperArgs args;
for (int i = 1; i < argc; i++) {
const std::string arg = argv[i];
auto next = [&]() -> std::string {
return i + 1 < argc ? argv[++i] : "";
};
if (arg == "--shm-base") args.shmBase = next();
else if (arg == "--width") args.width = std::atoi(next().c_str());
else if (arg == "--height") args.height = std::atoi(next().c_str());
else if (arg == "--volume") args.volume = std::atof(next().c_str());
else if (arg == "--hwdec") args.hwdec = next();
else if (arg == "--audio-delay") args.audioDelay = next();
}
args.width = std::max(16, args.width);
args.height = std::max(16, args.height);
return args;
}
} // namespace
int main(int argc, char** argv) {
std::setlocale(LC_NUMERIC, "C");
#if !defined(_WIN32)
signal(SIGPIPE, SIG_IGN);
#endif
const HelperArgs args = parseArgs(argc, argv);
g_state.mpv = mpv_create();
if (!g_state.mpv) {
emitLine(JsonWriter()
.str("event", "fatal")
.str("error", "mpv_create failed")
.finish());
return 1;
}
mpv_set_option_string(g_state.mpv, "vo", "libmpv");
mpv_set_option_string(g_state.mpv, "hwdec", args.hwdec.c_str());
mpv_set_option_string(g_state.mpv, "keep-open", "yes");
mpv_set_option_string(g_state.mpv, "idle", "yes");
mpv_set_option_string(g_state.mpv, "input-default-bindings", "no");
mpv_set_option_string(g_state.mpv, "osc", "no");
if (!args.audioDelay.empty()) {
/* Compensates the frame-copy video-path latency to restore
* lip-sync; calibrated per platform, see the architecture doc. */
mpv_set_option_string(g_state.mpv, "audio-delay",
args.audioDelay.c_str());
}
if (mpv_initialize(g_state.mpv) < 0) {
emitLine(JsonWriter()
.str("event", "fatal")
.str("error", "mpv_initialize failed")
.finish());
return 1;
}
mpv_request_log_messages(g_state.mpv, "warn");
double initialVolumePercent =
std::clamp(args.volume, 0.0, 1.0) * 100.0;
mpv_set_property(g_state.mpv, "volume", MPV_FORMAT_DOUBLE,
&initialVolumePercent);
mpv_observe_property(g_state.mpv, 1, "time-pos", MPV_FORMAT_DOUBLE);
mpv_observe_property(g_state.mpv, 2, "duration", MPV_FORMAT_DOUBLE);
mpv_observe_property(g_state.mpv, 3, "pause", MPV_FORMAT_FLAG);
mpv_observe_property(g_state.mpv, 4, "volume", MPV_FORMAT_DOUBLE);
mpv_observe_property(g_state.mpv, 5, "path", MPV_FORMAT_STRING);
mpv_observe_property(g_state.mpv, 6, "track-list", MPV_FORMAT_NODE);
mpv_observe_property(g_state.mpv, 7, "aid", MPV_FORMAT_STRING);
mpv_observe_property(g_state.mpv, 8, "sid", MPV_FORMAT_STRING);
mpv_observe_property(g_state.mpv, 9, "speed", MPV_FORMAT_DOUBLE);
mpv_observe_property(g_state.mpv, 10, "video-aspect-override",
MPV_FORMAT_STRING);
mpv_observe_property(g_state.mpv, 11, "eof-reached", MPV_FORMAT_FLAG);
mpv_observe_property(g_state.mpv, 12, "dwidth", MPV_FORMAT_INT64);
mpv_observe_property(g_state.mpv, 13, "dheight", MPV_FORMAT_INT64);
g_state.pipeline.onGenerationChanged = [](const std::string& name,
int width, int height,
uint32_t generation) {
emitLine(JsonWriter()
.str("event", "shm")
.str("name", name)
.num("width", width)
.num("height", height)
.num("generation", generation)
.finish());
};
g_state.viewportWidth = args.width;
g_state.viewportHeight = args.height;
std::string startError;
if (!g_state.pipeline.start(g_state.mpv, args.shmBase, args.width,
args.height, startError)) {
emitLine(JsonWriter()
.str("event", "fatal")
.str("error", startError)
.finish());
return 1;
}
std::thread renderThread([] { g_state.pipeline.runLoop(); });
/* The render context is created inside the render thread; hook the
* update callback once it exists (or bail if GL init failed). */
while (g_state.pipeline.initState() == 0) {
std::this_thread::sleep_for(std::chrono::milliseconds(5));
}
if (g_state.pipeline.initState() < 0) {
renderThread.join();
mpv_terminate_destroy(g_state.mpv);
return 1;
}
mpv_render_context_set_update_callback(g_state.pipeline.renderContext(),
onRenderUpdate, &g_state.pipeline);
#if defined(_WIN32)
const double helperPid = (double)GetCurrentProcessId();
#else
const double helperPid = (double)getpid();
#endif
emitLine(JsonWriter()
.str("event", "hello")
.num("pid", helperPid)
.num("protocolVersion", 1)
.finish());
std::thread stdinThread(runStdinLoop);
runMpvEventLoop();
g_state.pipeline.stop();
renderThread.join();
mpv_terminate_destroy(g_state.mpv);
if (stdinThread.joinable()) {
/* stdin thread exits on EOF; detach if the pipe is still open. */
stdinThread.detach();
}
emitLine(JsonWriter().str("event", "bye").finish());
return 0;
}
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