]> git.sesse.net Git - nageru/blob - x264_encoder.cpp
Set x264 global headers (Quick Sync global headers are still not there).
[nageru] / x264_encoder.cpp
1 #include <string.h>
2 #include <unistd.h>
3
4 #include "defs.h"
5 #include "flags.h"
6 #include "mux.h"
7 #include "timebase.h"
8 #include "x264_encoder.h"
9
10 extern "C" {
11 #include <libavformat/avformat.h>
12 }
13
14 using namespace std;
15
16 X264Encoder::X264Encoder(AVOutputFormat *oformat)
17         : wants_global_headers(oformat->flags & AVFMT_GLOBALHEADER)
18 {
19         frame_pool.reset(new uint8_t[WIDTH * HEIGHT * 2 * X264_QUEUE_LENGTH]);
20         for (unsigned i = 0; i < X264_QUEUE_LENGTH; ++i) {
21                 free_frames.push(frame_pool.get() + i * (WIDTH * HEIGHT * 2));
22         }
23         encoder_thread = thread(&X264Encoder::encoder_thread_func, this);
24 }
25
26 X264Encoder::~X264Encoder()
27 {
28         should_quit = true;
29         queued_frames_nonempty.notify_all();
30         encoder_thread.join();
31 }
32
33 void X264Encoder::add_frame(int64_t pts, int64_t duration, const uint8_t *data)
34 {
35         QueuedFrame qf;
36         qf.pts = pts;
37         qf.duration = duration;
38
39         {
40                 lock_guard<mutex> lock(mu);
41                 if (free_frames.empty()) {
42                         fprintf(stderr, "WARNING: x264 queue full, dropping frame with pts %ld\n", pts);
43                         return;
44                 }
45
46                 qf.data = free_frames.front();
47                 free_frames.pop();
48         }
49
50         memcpy(qf.data, data, WIDTH * HEIGHT * 2);
51
52         {
53                 lock_guard<mutex> lock(mu);
54                 queued_frames.push(qf);
55                 queued_frames_nonempty.notify_all();
56         }
57 }
58         
59 void X264Encoder::init_x264()
60 {
61         x264_param_t param;
62         x264_param_default_preset(&param, global_flags.x264_preset.c_str(), global_flags.x264_tune.c_str());
63
64         param.i_width = WIDTH;
65         param.i_height = HEIGHT;
66         param.i_csp = X264_CSP_NV12;
67         param.b_vfr_input = 1;
68         param.i_timebase_num = 1;
69         param.i_timebase_den = TIMEBASE;
70         param.i_keyint_max = 50; // About one second.
71
72         // NOTE: These should be in sync with the ones in h264encode.cpp (sbs_rbsp()).
73         param.vui.i_vidformat = 5;  // Unspecified.
74         param.vui.b_fullrange = 0;
75         param.vui.i_colorprim = 1;  // BT.709.
76         param.vui.i_transfer = 2;  // Unspecified (since we use sRGB).
77         param.vui.i_colmatrix = 6;  // BT.601/SMPTE 170M.
78
79         // 4.5 Mbit/sec, CBR.
80         param.rc.i_rc_method = X264_RC_ABR;
81         param.rc.i_bitrate = 4500;
82
83         // One-second VBV.
84         param.rc.i_vbv_max_bitrate = 4500;
85         param.rc.i_vbv_buffer_size = 4500;
86
87         // TODO: more flags here, via x264_param_parse().
88
89         x264_param_apply_profile(&param, "high");
90
91         param.b_repeat_headers = !wants_global_headers;
92
93         x264 = x264_encoder_open(&param);
94         if (x264 == nullptr) {
95                 fprintf(stderr, "ERROR: x264 initialization failed.\n");
96                 exit(1);
97         }
98
99         if (wants_global_headers) {
100                 x264_nal_t *nal;
101                 int num_nal;
102
103                 x264_encoder_headers(x264, &nal, &num_nal);
104
105                 for (int i = 0; i < num_nal; ++i) {
106                         if (nal[i].i_type == NAL_SEI) {
107                                 // Don't put the SEI in extradata; make it part of the first frame instead.
108                                 buffered_sei += string((const char *)nal[i].p_payload, nal[i].i_payload);
109                         } else {
110                                 global_headers += string((const char *)nal[i].p_payload, nal[i].i_payload);
111                         }
112                 }
113         }
114 }
115
116 void X264Encoder::encoder_thread_func()
117 {
118         nice(5);  // Note that x264 further nices some of its threads.
119         init_x264();
120
121         bool frames_left;
122
123         do {
124                 QueuedFrame qf;
125
126                 // Wait for a queued frame, then dequeue it.
127                 {
128                         unique_lock<mutex> lock(mu);
129                         queued_frames_nonempty.wait(lock, [this]() { return !queued_frames.empty() || should_quit; });
130                         if (!queued_frames.empty()) {
131                                 qf = queued_frames.front();
132                                 queued_frames.pop();
133                         } else {
134                                 qf.pts = -1;
135                                 qf.duration = -1;
136                                 qf.data = nullptr;
137                         }
138
139                         frames_left = !queued_frames.empty();
140                 }
141
142                 encode_frame(qf);
143                 
144                 {
145                         lock_guard<mutex> lock(mu);
146                         free_frames.push(qf.data);
147                 }
148
149                 // We should quit only if the should_quit flag is set _and_ we have nothing
150                 // in either queue.
151         } while (!should_quit || frames_left || x264_encoder_delayed_frames(x264) > 0);
152
153         x264_encoder_close(x264);
154 }
155
156 void X264Encoder::encode_frame(X264Encoder::QueuedFrame qf)
157 {
158         x264_nal_t *nal = nullptr;
159         int num_nal = 0;
160         x264_picture_t pic;
161
162         if (qf.data) {
163                 x264_picture_init(&pic);
164
165                 pic.i_pts = qf.pts;
166                 pic.img.i_csp = X264_CSP_NV12;
167                 pic.img.i_plane = 2;
168                 pic.img.plane[0] = qf.data;
169                 pic.img.i_stride[0] = WIDTH;
170                 pic.img.plane[1] = qf.data + WIDTH * HEIGHT;
171                 pic.img.i_stride[1] = WIDTH / 2 * sizeof(uint16_t);
172                 pic.opaque = reinterpret_cast<void *>(intptr_t(qf.duration));
173
174                 x264_encoder_encode(x264, &nal, &num_nal, &pic, &pic);
175         } else {
176                 x264_encoder_encode(x264, &nal, &num_nal, nullptr, &pic);
177         }
178
179         // We really need one AVPacket for the entire frame, it seems,
180         // so combine it all.
181         size_t num_bytes = buffered_sei.size();
182         for (int i = 0; i < num_nal; ++i) {
183                 num_bytes += nal[i].i_payload;
184         }
185
186         unique_ptr<uint8_t[]> data(new uint8_t[num_bytes]);
187         uint8_t *ptr = data.get();
188
189         if (!buffered_sei.empty()) {
190                 memcpy(ptr, buffered_sei.data(), buffered_sei.size());
191                 ptr += buffered_sei.size();
192                 buffered_sei.clear();
193         }
194         for (int i = 0; i < num_nal; ++i) {
195                 memcpy(ptr, nal[i].p_payload, nal[i].i_payload);
196                 ptr += nal[i].i_payload;
197         }
198
199         AVPacket pkt;
200         memset(&pkt, 0, sizeof(pkt));
201         pkt.buf = nullptr;
202         pkt.data = data.get();
203         pkt.size = num_bytes;
204         pkt.stream_index = 0;
205         if (pic.b_keyframe) {
206                 pkt.flags = AV_PKT_FLAG_KEY;
207         } else {
208                 pkt.flags = 0;
209         }
210         pkt.duration = reinterpret_cast<intptr_t>(pic.opaque);
211
212         mux->add_packet(pkt, pic.i_pts, pic.i_dts);
213 }