8 #include "x264encode.h"
11 #include <libavformat/avformat.h>
16 X264Encoder::X264Encoder(Mux *mux)
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));
23 encoder_thread = thread(&X264Encoder::encoder_thread_func, this);
26 X264Encoder::~X264Encoder()
29 queued_frames_nonempty.notify_all();
30 encoder_thread.join();
33 void X264Encoder::add_frame(int64_t pts, const uint8_t *data)
39 lock_guard<mutex> lock(mu);
40 if (free_frames.empty()) {
41 fprintf(stderr, "WARNING: x264 queue full, dropping frame with pts %ld\n", pts);
45 qf.data = free_frames.front();
49 memcpy(qf.data, data, WIDTH * HEIGHT * 2);
52 lock_guard<mutex> lock(mu);
53 queued_frames.push(qf);
54 queued_frames_nonempty.notify_all();
58 void X264Encoder::init_x264()
61 x264_param_default_preset(¶m, global_flags.x264_preset.c_str(), global_flags.x264_tune.c_str());
63 param.i_width = WIDTH;
64 param.i_height = HEIGHT;
65 param.i_csp = X264_CSP_NV12;
66 param.b_vfr_input = 1;
67 param.i_timebase_num = 1;
68 param.i_timebase_den = TIMEBASE;
69 param.i_keyint_max = 50; // About one second.
71 // NOTE: These should be in sync with the ones in h264encode.cpp (sbs_rbsp()).
72 param.vui.i_vidformat = 5; // Unspecified.
73 param.vui.b_fullrange = 0;
74 param.vui.i_colorprim = 1; // BT.709.
75 param.vui.i_transfer = 2; // Unspecified (since we use sRGB).
76 param.vui.i_colmatrix = 6; // BT.601/SMPTE 170M.
79 param.rc.i_rc_method = X264_RC_ABR;
80 param.rc.i_bitrate = 4500;
83 param.rc.i_vbv_max_bitrate = 4500;
84 param.rc.i_vbv_buffer_size = 4500;
86 // TODO: more flags here, via x264_param_parse().
88 x264_param_apply_profile(¶m, "high");
90 x264 = x264_encoder_open(¶m);
91 if (x264 == nullptr) {
92 fprintf(stderr, "ERROR: x264 initialization failed.\n");
97 void X264Encoder::encoder_thread_func()
99 nice(5); // Note that x264 further nices some of its threads.
107 // Wait for a queued frame, then dequeue it.
109 unique_lock<mutex> lock(mu);
110 queued_frames_nonempty.wait(lock, [this]() { return !queued_frames.empty() || should_quit; });
111 if (!queued_frames.empty()) {
112 qf = queued_frames.front();
119 frames_left = !queued_frames.empty();
125 lock_guard<mutex> lock(mu);
126 free_frames.push(qf.data);
129 // We should quit only if the should_quit flag is set _and_ we have nothing
131 } while (!should_quit || frames_left || x264_encoder_delayed_frames(x264) > 0);
133 x264_encoder_close(x264);
136 void X264Encoder::encode_frame(X264Encoder::QueuedFrame qf)
138 x264_nal_t *nal = nullptr;
143 x264_picture_init(&pic);
146 pic.img.i_csp = X264_CSP_NV12;
148 pic.img.plane[0] = qf.data;
149 pic.img.i_stride[0] = WIDTH;
150 pic.img.plane[1] = qf.data + WIDTH * HEIGHT;
151 pic.img.i_stride[1] = WIDTH / 2 * sizeof(uint16_t);
153 x264_encoder_encode(x264, &nal, &num_nal, &pic, &pic);
155 x264_encoder_encode(x264, &nal, &num_nal, nullptr, &pic);
158 // We really need one AVPacket for the entire frame, it seems,
159 // so combine it all.
160 size_t num_bytes = 0;
161 for (int i = 0; i < num_nal; ++i) {
162 num_bytes += nal[i].i_payload;
165 unique_ptr<uint8_t[]> data(new uint8_t[num_bytes]);
166 uint8_t *ptr = data.get();
168 for (int i = 0; i < num_nal; ++i) {
169 memcpy(ptr, nal[i].p_payload, nal[i].i_payload);
170 ptr += nal[i].i_payload;
174 memset(&pkt, 0, sizeof(pkt));
176 pkt.data = data.get();
177 pkt.size = num_bytes;
178 pkt.stream_index = 0;
179 if (pic.b_keyframe) {
180 pkt.flags = AV_PKT_FLAG_KEY;
185 mux->add_packet(pkt, pic.i_pts, pic.i_dts);