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decklink-out: preroll frames before StartScheduledPlayback, detect output format

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This commit is contained in:
Johanness
2026-05-30 23:21:13 +03:00
parent a3cd45cc49
commit 26febc41d6
2 changed files with 44 additions and 24 deletions
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nodes/decklink-out/src/decklink_out_node.cpp
+41 -23
View File
@@ -126,20 +126,6 @@ bool DeckLinkOutNode::open_device() {
callback_ = std::make_unique<OutputCallback>(*this);
output_->SetScheduledFrameCompletionCallback(callback_.get());
{
BMDDisplayMode actual_mode = bmdModeUnknown;
bool supported = false;
auto hr = output_->DoesSupportVideoMode(bmdVideoConnectionUnspecified, display_mode_, bmdFormat10BitYUV,
bmdNoVideoOutputConversion, bmdSupportedVideoModeDefault, &actual_mode, &supported);
if (hr == S_OK) {
spdlog::info("DeckLink-out: mode 0x{:x} V210 supported={} actual=0x{:x}",
static_cast<uint32_t>(display_mode_), supported, static_cast<uint32_t>(actual_mode));
if (!supported) {
spdlog::error("DeckLink-out: display mode not supported for V210 output");
}
}
}
if (output_->EnableVideoOutput(display_mode_, bmdVideoOutputFlagDefault) != S_OK) {
spdlog::error("DeckLink-out: failed to enable video output");
return false;
@@ -171,6 +157,39 @@ bool DeckLinkOutNode::open_device() {
is_interlaced_);
}
preroll_frames_ = 3;
for (int i = 0; i < preroll_frames_; ++i) {
IDeckLinkMutableVideoFrame* frame = nullptr;
int32_t out_row_bytes = out_width_ * 16 / 6;
if (output_->CreateVideoFrame(out_width_, out_height_, out_row_bytes,
bmdFormat10BitYUV, bmdFrameFlagDefault, &frame) != S_OK || !frame) {
out_row_bytes = out_width_ * 2;
if (output_->CreateVideoFrame(out_width_, out_height_, out_row_bytes,
bmdFormat8BitYUV, bmdFrameFlagDefault, &frame) != S_OK || !frame) {
spdlog::error("DeckLink-out: failed to create preroll frame");
return false;
}
spdlog::info("DeckLink-out: using 8BitYUV output format");
output_format_ = bmdFormat8BitYUV;
} else {
output_format_ = bmdFormat10BitYUV;
}
IDeckLinkVideoBuffer* buf = nullptr;
if (frame->QueryInterface(IID_IDeckLinkVideoBuffer, (void**)&buf) == S_OK && buf) {
buf->StartAccess(bmdBufferAccessWrite);
void* dst = nullptr;
buf->GetBytes(&dst);
if (dst) {
std::memset(dst, 0, out_row_bytes * out_height_);
}
buf->EndAccess(bmdBufferAccessWrite);
buf->Release();
}
auto stream_time = i * frame_duration_;
output_->ScheduleVideoFrame(frame, stream_time, frame_duration_, time_scale_);
frame->Release();
}
if (output_->StartScheduledPlayback(0, time_scale_, 1.0) != S_OK) {
spdlog::error("DeckLink-out: failed to start scheduled playback");
return false;
@@ -201,24 +220,23 @@ void DeckLinkOutNode::schedule_frame(void* mxl_payload, long width, long height,
if (!output_) return;
int32_t out_row_bytes = 0;
HRESULT row_hr = output_->RowBytesForPixelFormat(bmdFormat10BitYUV, width, &out_row_bytes);
if (row_hr != S_OK || out_row_bytes <= 0) {
spdlog::warn("DeckLink-out: RowBytesForPixelFormat failed hr=0x{:08x}", static_cast<uint32_t>(row_hr));
if (output_format_ == bmdFormat10BitYUV) {
if (output_->RowBytesForPixelFormat(bmdFormat10BitYUV, width, &out_row_bytes) != S_OK || out_row_bytes <= 0) {
out_row_bytes = ((width + 5) / 6) * 16;
}
} else {
out_row_bytes = width * 2;
}
IDeckLinkMutableVideoFrame* frame = nullptr;
HRESULT hr = output_->CreateVideoFrame(width, height, out_row_bytes, bmdFormat10BitYUV,
HRESULT hr = output_->CreateVideoFrame(width, height, out_row_bytes, output_format_,
bmdFrameFlagDefault, &frame);
if (hr != S_OK || !frame) {
if (create_fail_count_ < 5) {
spdlog::error("DeckLink-out: CreateVideoFrame {}x{} row_bytes={} fmt=V210 hr=0x{:08x}",
width, height, out_row_bytes, static_cast<uint32_t>(hr));
spdlog::error("DeckLink-out: CreateVideoFrame {}x{} row_bytes={} fmt=0x{:x} hr=0x{:08x}",
width, height, out_row_bytes, static_cast<uint32_t>(output_format_), static_cast<uint32_t>(hr));
create_fail_count_++;
}
if (create_fail_count_ == 5) {
spdlog::error("DeckLink-out: suppressing further CreateVideoFrame errors");
}
return;
}
nodes/decklink-out/src/decklink_out_node.hpp
+2
View File
@@ -55,6 +55,8 @@ private:
IDeckLinkOutput* output_ = nullptr;
BMDTimeValue frame_duration_ = 1000;
BMDTimeScale time_scale_ = 50000;
BMDPixelFormat output_format_ = bmdFormat10BitYUV;
int preroll_frames_ = 3;
std::atomic<bool> playing_{false};
int create_fail_count_ = 0;