1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
|
// 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
bool IsH264Stream(std::span<const u8> data) {
if (data.size() >= 4) {
// Annex-B 3-byte start code: 00 00 01 <nal_header>
if (data[0] == 0 && data[1] == 0 && data[2] == 1) {
const u8 nal_type = data[3] & 0x1F;
if ((data[3] & 0x80) == 0 && nal_type >= 1 && nal_type <= 23) {
return true;
}
}
}
if (data.size() >= 5) {
// Annex-B 4-byte start code: 00 00 00 01 <nal_header>
if (data[0] == 0 && data[1] == 0 && data[2] == 0 && data[3] == 1) {
const u8 nal_type = data[4] & 0x1F;
if ((data[4] & 0x80) == 0 && nal_type >= 1 && nal_type <= 23) {
return true;
}
}
// avcC / MP4 length-prefixed NAL unit: [u32 be length] <nal_header>
const u32 nalu_len = (static_cast<u32>(data[0]) << 24) |
(static_cast<u32>(data[1]) << 16) |
(static_cast<u32>(data[2]) << 8) |
static_cast<u32>(data[3]);
if (nalu_len > 0 && nalu_len <= data.size() - 4) {
const u8 nal_type = data[4] & 0x1F;
if ((data[4] & 0x80) == 0 && nal_type >= 1 && nal_type <= 23) {
return true;
}
}
}
if (data.size() >= 7) {
// avcC configuration record: version=1, profile, compat, level, lengthSizeMinusOne | 0xFC, numSPS | 0xE0
if (data[0] == 1 && (data[4] & 0xFC) == 0xFC && (data[5] & 0xE0) == 0xE0 && (data[5] & 0x1F) > 0) {
return true;
}
}
return false;
}
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());
// Convert MP4/avcC length-prefixed NALUs to Annex-B start codes for FFmpeg if needed.
if (impl->name.find("avc") != std::string::npos || impl->name.find("264") != std::string::npos) {
const bool is_annex_b = data.size() >= 4 &&
((data[0] == 0 && data[1] == 0 && data[2] == 1) ||
(data.size() >= 5 && data[0] == 0 && data[1] == 0 && data[2] == 0 && data[3] == 1));
if (!is_annex_b && data.size() >= 5) {
size_t offset = 0;
while (offset + 4 < data.size()) {
const u32 nalu_len = (static_cast<u32>(impl->packet[offset]) << 24) |
(static_cast<u32>(impl->packet[offset + 1]) << 16) |
(static_cast<u32>(impl->packet[offset + 2]) << 8) |
static_cast<u32>(impl->packet[offset + 3]);
if (nalu_len == 0 || offset + 4 + nalu_len > data.size()) {
break;
}
impl->packet[offset] = 0;
impl->packet[offset + 1] = 0;
impl->packet[offset + 2] = 0;
impl->packet[offset + 3] = 1;
offset += 4 + nalu_len;
}
}
}
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
|
