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// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later
#include <array>
#include <cstring>
#include <optional>
#include <set>
#include "common/logging.h"
#include "common/settings.h"
#include "video_core/host1x/ffmpeg.h"
#include "video_core/host1x/nx2_video_decoder.h"
extern "C" {
#if defined(__GNUC__) || defined(__clang__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wconversion"
#endif
#include <libswscale/swscale.h>
#if defined(__GNUC__) || defined(__clang__)
#pragma GCC diagnostic pop
#endif
}
namespace Tegra::Host1x {
namespace {
std::optional<NvdecCommon::VideoCodec> CodecFromMime(std::string_view mime) {
if (mime.find("vp9") != std::string_view::npos) {
return NvdecCommon::VideoCodec::VP9;
}
if (mime.find("vp8") != std::string_view::npos) {
return NvdecCommon::VideoCodec::VP8;
}
// "video/av01" or "video/av1". FFmpeg decodes AV1 with libdav1d.
if (mime.find("av01") != std::string_view::npos || mime.find("av1") != std::string_view::npos) {
return NvdecCommon::VideoCodec::AV1;
}
if (mime.find("avc") != std::string_view::npos || mime.find("264") != std::string_view::npos) {
return NvdecCommon::VideoCodec::H264;
}
return std::nullopt;
}
} // namespace
struct Nx2VideoDecoder::Impl {
std::string name;
std::optional<FFmpeg::Decoder> decoder;
std::optional<FFmpeg::HardwareContext> hardware;
std::optional<FFmpeg::DecoderContext> context;
SwsContext* scaler{};
bool open{};
/// Timestamps of submitted frames not yet output. Frames copied back from a host GPU decoder
/// lose theirs and take the earliest one instead.
std::multiset<u64> pending_pts;
std::vector<u8> packet; ///< FFmpeg reads up to AV_INPUT_BUFFER_PADDING_SIZE past the data
~Impl() {
sws_freeContext(scaler);
context.reset();
hardware.reset();
}
void Receive(std::vector<Nx2Picture>& pictures) {
while (auto frame = context->ReceiveFrame()) {
const AVFrame* f = frame->GetFrame();
const s64 stamp = f->best_effort_timestamp != AV_NOPTS_VALUE ? f->best_effort_timestamp
: f->pts;
u64 pts{};
if (stamp != AV_NOPTS_VALUE) {
pts = static_cast<u64>(stamp);
if (const auto it = pending_pts.find(pts); it != pending_pts.end()) {
pending_pts.erase(it);
}
} else if (!pending_pts.empty()) {
pts = *pending_pts.begin();
pending_pts.erase(pending_pts.begin());
}
pictures.push_back({static_cast<u32>(f->width), static_cast<u32>(f->height), pts,
std::move(frame)});
}
}
};
Nx2VideoDecoder::Nx2VideoDecoder(std::string_view mime) : impl{std::make_unique<Impl>()} {
impl->name = std::string{mime};
const auto codec = CodecFromMime(mime);
if (!codec) {
LOG_ERROR(HW_GPU, "nx2 video: no decoder for codec \"{}\"", mime);
return;
}
impl->decoder.emplace(*codec);
if (impl->decoder->GetCodec() == nullptr) {
LOG_ERROR(HW_GPU, "nx2 video: FFmpeg has no decoder for \"{}\"", mime);
return;
}
impl->context.emplace(*impl->decoder);
if (Settings::values.nvdec_emulation.GetValue() == Settings::NvdecEmulation::Gpu) {
impl->hardware.emplace();
impl->hardware->InitializeForDecoder(*impl->context, *impl->decoder);
}
impl->open = impl->context->OpenContext(*impl->decoder);
LOG_INFO(HW_GPU, "nx2 video: decoder for \"{}\" {}", mime, impl->open ? "open" : "failed to open");
}
Nx2VideoDecoder::~Nx2VideoDecoder() = default;
bool Nx2VideoDecoder::IsOpen() const {
return impl->open;
}
const std::string& Nx2VideoDecoder::Name() const {
return impl->name;
}
void Nx2VideoDecoder::Decode(std::span<const u8> data, u64 pts, std::vector<Nx2Picture>& pictures) {
if (!impl->open || data.empty()) {
return;
}
impl->packet.assign(data.size() + AV_INPUT_BUFFER_PADDING_SIZE, 0);
std::memcpy(impl->packet.data(), data.data(), data.size());
FFmpeg::Packet packet{std::span<const u8>{impl->packet.data(), data.size()}};
packet.GetPacket()->pts = static_cast<s64>(pts);
// Hidden VP9 frames never come out: keep the set from growing over a long movie.
if (impl->pending_pts.size() >= 64) {
impl->pending_pts.erase(impl->pending_pts.begin());
}
impl->pending_pts.insert(pts);
impl->context->SendPacket(packet);
impl->Receive(pictures);
}
void Nx2VideoDecoder::Drain(std::vector<Nx2Picture>& pictures) {
if (!impl->open) {
return;
}
avcodec_send_packet(impl->context->GetCodecContext(), nullptr);
impl->Receive(pictures);
Reset();
}
void Nx2VideoDecoder::Reset() {
if (impl->open) {
avcodec_flush_buffers(impl->context->GetCodecContext());
}
impl->pending_pts.clear();
}
void Nx2VideoDecoder::Render(const Nx2Picture& picture, Nx2PictureFormat format, u32 width,
u32 height, u64 pitch, u64 chroma_offset, std::span<u8> out) {
const AVFrame* f = picture.frame->GetFrame();
const u64 needed = format == Nx2PictureFormat::Nv12
? chroma_offset + pitch * ((u64{height} + 1) / 2)
: pitch * height;
if (width == 0 || height == 0 || out.size() < needed) {
return;
}
const AVPixelFormat target = format == Nx2PictureFormat::Nv12 ? AV_PIX_FMT_NV12
: format == Nx2PictureFormat::Rgba8 ? AV_PIX_FMT_RGBA
: AV_PIX_FMT_BGRA;
impl->scaler = sws_getCachedContext(impl->scaler, f->width, f->height,
static_cast<AVPixelFormat>(f->format),
static_cast<int>(width), static_cast<int>(height), target,
SWS_BILINEAR, nullptr, nullptr, nullptr);
if (impl->scaler == nullptr) {
LOG_ERROR(HW_GPU, "nx2 video: cannot convert {} to {}",
av_get_pix_fmt_name(static_cast<AVPixelFormat>(f->format)),
av_get_pix_fmt_name(target));
return;
}
if (format != Nx2PictureFormat::Nv12) {
// The stream's matrix and range; untagged HD video is BT.709.
int space = SWS_CS_ITU601;
if (f->colorspace == AVCOL_SPC_BT709 ||
(f->colorspace == AVCOL_SPC_UNSPECIFIED && f->height >= 720)) {
space = SWS_CS_ITU709;
} else if (f->colorspace == AVCOL_SPC_BT2020_NCL || f->colorspace == AVCOL_SPC_BT2020_CL) {
space = SWS_CS_BT2020;
}
const int* coefficients = sws_getCoefficients(space);
sws_setColorspaceDetails(impl->scaler, coefficients, f->color_range == AVCOL_RANGE_JPEG,
coefficients, 1, 0, 1 << 16, 1 << 16);
}
std::array<u8*, 4> planes{out.data(), nullptr, nullptr, nullptr};
std::array<int, 4> strides{static_cast<int>(pitch), 0, 0, 0};
if (format == Nx2PictureFormat::Nv12) {
planes[1] = out.data() + chroma_offset;
strides[1] = static_cast<int>(pitch);
}
sws_scale(impl->scaler, f->data, f->linesize, 0, f->height, planes.data(), strides.data());
}
} // namespace Tegra::Host1x
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