8 #include "x264_encoder.h"
9 #include "x264_speed_control.h"
12 #include <libavformat/avformat.h>
17 X264Encoder::X264Encoder(AVOutputFormat *oformat)
18 : wants_global_headers(oformat->flags & AVFMT_GLOBALHEADER)
20 frame_pool.reset(new uint8_t[WIDTH * HEIGHT * 2 * X264_QUEUE_LENGTH]);
21 for (unsigned i = 0; i < X264_QUEUE_LENGTH; ++i) {
22 free_frames.push(frame_pool.get() + i * (WIDTH * HEIGHT * 2));
24 encoder_thread = thread(&X264Encoder::encoder_thread_func, this);
27 X264Encoder::~X264Encoder()
30 queued_frames_nonempty.notify_all();
31 encoder_thread.join();
34 void X264Encoder::add_frame(int64_t pts, int64_t duration, const uint8_t *data)
38 qf.duration = duration;
41 lock_guard<mutex> lock(mu);
42 if (free_frames.empty()) {
43 fprintf(stderr, "WARNING: x264 queue full, dropping frame with pts %ld\n", pts);
47 qf.data = free_frames.front();
51 memcpy(qf.data, data, WIDTH * HEIGHT * 2);
54 lock_guard<mutex> lock(mu);
55 queued_frames.push(qf);
56 queued_frames_nonempty.notify_all();
60 void X264Encoder::init_x264()
63 x264_param_default_preset(¶m, global_flags.x264_preset.c_str(), global_flags.x264_tune.c_str());
65 param.i_width = WIDTH;
66 param.i_height = HEIGHT;
67 param.i_csp = X264_CSP_NV12;
68 param.b_vfr_input = 1;
69 param.i_timebase_num = 1;
70 param.i_timebase_den = TIMEBASE;
71 param.i_keyint_max = 50; // About one second.
72 if (global_flags.x264_speedcontrol) {
73 param.i_frame_reference = 16; // Because speedcontrol is never allowed to change this above what we set at start.
76 // NOTE: These should be in sync with the ones in h264encode.cpp (sbs_rbsp()).
77 param.vui.i_vidformat = 5; // Unspecified.
78 param.vui.b_fullrange = 0;
79 param.vui.i_colorprim = 1; // BT.709.
80 param.vui.i_transfer = 2; // Unspecified (since we use sRGB).
81 param.vui.i_colmatrix = 6; // BT.601/SMPTE 170M.
84 param.rc.i_rc_method = X264_RC_ABR;
85 param.rc.i_bitrate = global_flags.x264_bitrate;
86 if (global_flags.x264_vbv_buffer_size < 0) {
87 param.rc.i_vbv_buffer_size = param.rc.i_bitrate; // One-second VBV.
89 param.rc.i_vbv_buffer_size = global_flags.x264_vbv_buffer_size;
91 if (global_flags.x264_vbv_max_bitrate < 0) {
92 param.rc.i_vbv_max_bitrate = param.rc.i_bitrate; // CBR.
94 param.rc.i_vbv_max_bitrate = global_flags.x264_vbv_max_bitrate;
97 // Occasionally players have problem with extremely low quantizers;
98 // be on the safe side. Shouldn't affect quality in any meaningful way.
99 param.rc.i_qp_min = 5;
101 // TODO: more flags here, via x264_param_parse().
103 x264_param_apply_profile(¶m, "high");
105 param.b_repeat_headers = !wants_global_headers;
107 x264 = x264_encoder_open(¶m);
108 if (x264 == nullptr) {
109 fprintf(stderr, "ERROR: x264 initialization failed.\n");
113 if (global_flags.x264_speedcontrol) {
114 speed_control.reset(new X264SpeedControl(x264, /*f_speed=*/1.0f, X264_QUEUE_LENGTH, /*f_buffer_init=*/1.0f));
117 if (wants_global_headers) {
121 x264_encoder_headers(x264, &nal, &num_nal);
123 for (int i = 0; i < num_nal; ++i) {
124 if (nal[i].i_type == NAL_SEI) {
125 // Don't put the SEI in extradata; make it part of the first frame instead.
126 buffered_sei += string((const char *)nal[i].p_payload, nal[i].i_payload);
128 global_headers += string((const char *)nal[i].p_payload, nal[i].i_payload);
134 void X264Encoder::encoder_thread_func()
136 nice(5); // Note that x264 further nices some of its threads.
144 // Wait for a queued frame, then dequeue it.
146 unique_lock<mutex> lock(mu);
147 queued_frames_nonempty.wait(lock, [this]() { return !queued_frames.empty() || should_quit; });
148 if (!queued_frames.empty()) {
149 qf = queued_frames.front();
157 frames_left = !queued_frames.empty();
163 lock_guard<mutex> lock(mu);
164 free_frames.push(qf.data);
167 // We should quit only if the should_quit flag is set _and_ we have nothing
169 } while (!should_quit || frames_left || x264_encoder_delayed_frames(x264) > 0);
171 x264_encoder_close(x264);
174 void X264Encoder::encode_frame(X264Encoder::QueuedFrame qf)
176 x264_nal_t *nal = nullptr;
179 x264_picture_t *input_pic = nullptr;
182 x264_picture_init(&pic);
185 pic.img.i_csp = X264_CSP_NV12;
187 pic.img.plane[0] = qf.data;
188 pic.img.i_stride[0] = WIDTH;
189 pic.img.plane[1] = qf.data + WIDTH * HEIGHT;
190 pic.img.i_stride[1] = WIDTH / 2 * sizeof(uint16_t);
191 pic.opaque = reinterpret_cast<void *>(intptr_t(qf.duration));
197 speed_control->before_frame(float(free_frames.size()) / X264_QUEUE_LENGTH, X264_QUEUE_LENGTH, 1e6 * qf.duration / TIMEBASE);
199 x264_encoder_encode(x264, &nal, &num_nal, input_pic, &pic);
201 speed_control->after_frame();
204 // We really need one AVPacket for the entire frame, it seems,
205 // so combine it all.
206 size_t num_bytes = buffered_sei.size();
207 for (int i = 0; i < num_nal; ++i) {
208 num_bytes += nal[i].i_payload;
211 unique_ptr<uint8_t[]> data(new uint8_t[num_bytes]);
212 uint8_t *ptr = data.get();
214 if (!buffered_sei.empty()) {
215 memcpy(ptr, buffered_sei.data(), buffered_sei.size());
216 ptr += buffered_sei.size();
217 buffered_sei.clear();
219 for (int i = 0; i < num_nal; ++i) {
220 memcpy(ptr, nal[i].p_payload, nal[i].i_payload);
221 ptr += nal[i].i_payload;
225 memset(&pkt, 0, sizeof(pkt));
227 pkt.data = data.get();
228 pkt.size = num_bytes;
229 pkt.stream_index = 0;
230 if (pic.b_keyframe) {
231 pkt.flags = AV_PKT_FLAG_KEY;
235 pkt.duration = reinterpret_cast<intptr_t>(pic.opaque);
237 mux->add_packet(pkt, pic.i_pts, pic.i_dts);