+++ /dev/null
-#include "x264_encoder.h"
-
-#include <assert.h>
-#include <dlfcn.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <x264.h>
-#include <atomic>
-#include <cstdint>
-#include <functional>
-#include <mutex>
-
-#include "defs.h"
-#include "flags.h"
-#include "metrics.h"
-#include "mux.h"
-#include "print_latency.h"
-#include "timebase.h"
-#include "x264_dynamic.h"
-#include "x264_speed_control.h"
-
-extern "C" {
-#include <libavcodec/avcodec.h>
-#include <libavformat/avformat.h>
-}
-
-using namespace movit;
-using namespace std;
-using namespace std::chrono;
-using namespace std::placeholders;
-
-namespace {
-
-// X264Encoder can be restarted if --record-x264-video is set, so make these
-// metrics global.
-atomic<int64_t> metric_x264_queued_frames{0};
-atomic<int64_t> metric_x264_max_queued_frames{X264_QUEUE_LENGTH};
-atomic<int64_t> metric_x264_dropped_frames{0};
-atomic<int64_t> metric_x264_output_frames_i{0};
-atomic<int64_t> metric_x264_output_frames_p{0};
-atomic<int64_t> metric_x264_output_frames_b{0};
-Histogram metric_x264_crf;
-LatencyHistogram x264_latency_histogram;
-once_flag x264_metrics_inited;
-
-void update_vbv_settings(x264_param_t *param)
-{
- if (global_flags.x264_bitrate == -1) {
- return;
- }
- if (global_flags.x264_vbv_buffer_size < 0) {
- param->rc.i_vbv_buffer_size = param->rc.i_bitrate; // One-second VBV.
- } else {
- param->rc.i_vbv_buffer_size = global_flags.x264_vbv_buffer_size;
- }
- if (global_flags.x264_vbv_max_bitrate < 0) {
- param->rc.i_vbv_max_bitrate = param->rc.i_bitrate; // CBR.
- } else {
- param->rc.i_vbv_max_bitrate = global_flags.x264_vbv_max_bitrate;
- }
-}
-
-} // namespace
-
-X264Encoder::X264Encoder(AVOutputFormat *oformat)
- : wants_global_headers(oformat->flags & AVFMT_GLOBALHEADER),
- dyn(load_x264_for_bit_depth(global_flags.x264_bit_depth))
-{
- call_once(x264_metrics_inited, [](){
- global_metrics.add("x264_queued_frames", &metric_x264_queued_frames, Metrics::TYPE_GAUGE);
- global_metrics.add("x264_max_queued_frames", &metric_x264_max_queued_frames, Metrics::TYPE_GAUGE);
- global_metrics.add("x264_dropped_frames", &metric_x264_dropped_frames);
- global_metrics.add("x264_output_frames", {{ "type", "i" }}, &metric_x264_output_frames_i);
- global_metrics.add("x264_output_frames", {{ "type", "p" }}, &metric_x264_output_frames_p);
- global_metrics.add("x264_output_frames", {{ "type", "b" }}, &metric_x264_output_frames_b);
-
- metric_x264_crf.init_uniform(50);
- global_metrics.add("x264_crf", &metric_x264_crf);
- x264_latency_histogram.init("x264");
- });
-
- size_t bytes_per_pixel = global_flags.x264_bit_depth > 8 ? 2 : 1;
- frame_pool.reset(new uint8_t[global_flags.width * global_flags.height * 2 * bytes_per_pixel * X264_QUEUE_LENGTH]);
- for (unsigned i = 0; i < X264_QUEUE_LENGTH; ++i) {
- free_frames.push(frame_pool.get() + i * (global_flags.width * global_flags.height * 2 * bytes_per_pixel));
- }
- encoder_thread = thread(&X264Encoder::encoder_thread_func, this);
-}
-
-X264Encoder::~X264Encoder()
-{
- should_quit = true;
- queued_frames_nonempty.notify_all();
- encoder_thread.join();
- if (dyn.handle) {
- dlclose(dyn.handle);
- }
-}
-
-void X264Encoder::add_frame(int64_t pts, int64_t duration, YCbCrLumaCoefficients ycbcr_coefficients, const uint8_t *data, const ReceivedTimestamps &received_ts)
-{
- assert(!should_quit);
-
- QueuedFrame qf;
- qf.pts = pts;
- qf.duration = duration;
- qf.ycbcr_coefficients = ycbcr_coefficients;
- qf.received_ts = received_ts;
-
- {
- lock_guard<mutex> lock(mu);
- if (free_frames.empty()) {
- fprintf(stderr, "WARNING: x264 queue full, dropping frame with pts %ld\n", pts);
- ++metric_x264_dropped_frames;
- return;
- }
-
- qf.data = free_frames.front();
- free_frames.pop();
- }
-
- size_t bytes_per_pixel = global_flags.x264_bit_depth > 8 ? 2 : 1;
- memcpy(qf.data, data, global_flags.width * global_flags.height * 2 * bytes_per_pixel);
-
- {
- lock_guard<mutex> lock(mu);
- queued_frames.push(qf);
- queued_frames_nonempty.notify_all();
- metric_x264_queued_frames = queued_frames.size();
- }
-}
-
-void X264Encoder::init_x264()
-{
- x264_param_t param;
- dyn.x264_param_default_preset(¶m, global_flags.x264_preset.c_str(), global_flags.x264_tune.c_str());
-
- param.i_width = global_flags.width;
- param.i_height = global_flags.height;
- param.i_csp = X264_CSP_NV12;
- if (global_flags.x264_bit_depth > 8) {
- param.i_csp |= X264_CSP_HIGH_DEPTH;
- }
- param.b_vfr_input = 1;
- param.i_timebase_num = 1;
- param.i_timebase_den = TIMEBASE;
- param.i_keyint_max = 50; // About one second.
- if (global_flags.x264_speedcontrol) {
- param.i_frame_reference = 16; // Because speedcontrol is never allowed to change this above what we set at start.
- }
-#if X264_BUILD >= 153
- param.i_bitdepth = global_flags.x264_bit_depth;
-#endif
-
- // NOTE: These should be in sync with the ones in quicksync_encoder.cpp (sps_rbsp()).
- param.vui.i_vidformat = 5; // Unspecified.
- param.vui.b_fullrange = 0;
- param.vui.i_colorprim = 1; // BT.709.
- param.vui.i_transfer = 13; // sRGB.
- if (global_flags.ycbcr_rec709_coefficients) {
- param.vui.i_colmatrix = 1; // BT.709.
- } else {
- param.vui.i_colmatrix = 6; // BT.601/SMPTE 170M.
- }
-
- if (!isinf(global_flags.x264_crf)) {
- param.rc.i_rc_method = X264_RC_CRF;
- param.rc.f_rf_constant = global_flags.x264_crf;
- } else {
- param.rc.i_rc_method = X264_RC_ABR;
- param.rc.i_bitrate = global_flags.x264_bitrate;
- }
- update_vbv_settings(¶m);
- if (param.rc.i_vbv_max_bitrate > 0) {
- // If the user wants VBV control to cap the max rate, it is
- // also reasonable to assume that they are fine with the stream
- // constantly being around that rate even for very low-complexity
- // content; the obvious and extreme example being a static
- // black picture.
- //
- // One would think it's fine to have low-complexity content use
- // less bitrate, but it seems to cause problems in practice;
- // e.g. VLC seems to often drop the stream (similar to a buffer
- // underrun) in such cases, but only when streaming from Nageru,
- // not when reading a dump of the same stream from disk.
- // I'm not 100% sure whether it's in VLC (possibly some buffering
- // in the HTTP layer), in microhttpd or somewhere in Nageru itself,
- // but it's a typical case of problems that can arise. Similarly,
- // TCP's congestion control is not always fond of the rate staying
- // low for a while and then rising quickly -- a variation on the same
- // problem.
- //
- // We solve this by simply asking x264 to fill in dummy bits
- // in these cases, so that the bitrate stays reasonable constant.
- // It's a waste of bandwidth, but it makes things go much more
- // smoothly in these cases. (We don't do it if VBV control is off
- // in general, not the least because it makes no sense and x264
- // thus ignores the parameter.)
- param.rc.b_filler = 1;
- }
-
- // Occasionally players have problem with extremely low quantizers;
- // be on the safe side. Shouldn't affect quality in any meaningful way.
- param.rc.i_qp_min = 5;
-
- for (const string &str : global_flags.x264_extra_param) {
- const size_t pos = str.find(',');
- if (pos == string::npos) {
- if (dyn.x264_param_parse(¶m, str.c_str(), nullptr) != 0) {
- fprintf(stderr, "ERROR: x264 rejected parameter '%s'\n", str.c_str());
- }
- } else {
- const string key = str.substr(0, pos);
- const string value = str.substr(pos + 1);
- if (dyn.x264_param_parse(¶m, key.c_str(), value.c_str()) != 0) {
- fprintf(stderr, "ERROR: x264 rejected parameter '%s' set to '%s'\n",
- key.c_str(), value.c_str());
- }
- }
- }
-
- if (global_flags.x264_bit_depth > 8) {
- dyn.x264_param_apply_profile(¶m, "high10");
- } else {
- dyn.x264_param_apply_profile(¶m, "high");
- }
-
- param.b_repeat_headers = !wants_global_headers;
-
- x264 = dyn.x264_encoder_open(¶m);
- if (x264 == nullptr) {
- fprintf(stderr, "ERROR: x264 initialization failed.\n");
- exit(1);
- }
-
- if (global_flags.x264_speedcontrol) {
- speed_control.reset(new X264SpeedControl(x264, /*f_speed=*/1.0f, X264_QUEUE_LENGTH, /*f_buffer_init=*/1.0f));
- }
-
- if (wants_global_headers) {
- x264_nal_t *nal;
- int num_nal;
-
- dyn.x264_encoder_headers(x264, &nal, &num_nal);
-
- for (int i = 0; i < num_nal; ++i) {
- if (nal[i].i_type == NAL_SEI) {
- // Don't put the SEI in extradata; make it part of the first frame instead.
- buffered_sei += string((const char *)nal[i].p_payload, nal[i].i_payload);
- } else {
- global_headers += string((const char *)nal[i].p_payload, nal[i].i_payload);
- }
- }
- }
-}
-
-void X264Encoder::encoder_thread_func()
-{
- if (nice(5) == -1) { // Note that x264 further nices some of its threads.
- perror("nice()");
- // No exit; it's not fatal.
- }
- pthread_setname_np(pthread_self(), "x264_encode");
- init_x264();
- x264_init_done = true;
-
- bool frames_left;
-
- do {
- QueuedFrame qf;
-
- // Wait for a queued frame, then dequeue it.
- {
- unique_lock<mutex> lock(mu);
- queued_frames_nonempty.wait(lock, [this]() { return !queued_frames.empty() || should_quit; });
- if (!queued_frames.empty()) {
- qf = queued_frames.front();
- queued_frames.pop();
- } else {
- qf.pts = -1;
- qf.duration = -1;
- qf.data = nullptr;
- }
-
- metric_x264_queued_frames = queued_frames.size();
- frames_left = !queued_frames.empty();
- }
-
- encode_frame(qf);
-
- {
- lock_guard<mutex> lock(mu);
- free_frames.push(qf.data);
- }
-
- // We should quit only if the should_quit flag is set _and_ we have nothing
- // in either queue.
- } while (!should_quit || frames_left || dyn.x264_encoder_delayed_frames(x264) > 0);
-
- dyn.x264_encoder_close(x264);
-}
-
-void X264Encoder::encode_frame(X264Encoder::QueuedFrame qf)
-{
- x264_nal_t *nal = nullptr;
- int num_nal = 0;
- x264_picture_t pic;
- x264_picture_t *input_pic = nullptr;
-
- if (qf.data) {
- dyn.x264_picture_init(&pic);
-
- pic.i_pts = qf.pts;
- if (global_flags.x264_bit_depth > 8) {
- pic.img.i_csp = X264_CSP_NV12 | X264_CSP_HIGH_DEPTH;
- pic.img.i_plane = 2;
- pic.img.plane[0] = qf.data;
- pic.img.i_stride[0] = global_flags.width * sizeof(uint16_t);
- pic.img.plane[1] = qf.data + global_flags.width * global_flags.height * sizeof(uint16_t);
- pic.img.i_stride[1] = global_flags.width / 2 * sizeof(uint32_t);
- } else {
- pic.img.i_csp = X264_CSP_NV12;
- pic.img.i_plane = 2;
- pic.img.plane[0] = qf.data;
- pic.img.i_stride[0] = global_flags.width;
- pic.img.plane[1] = qf.data + global_flags.width * global_flags.height;
- pic.img.i_stride[1] = global_flags.width / 2 * sizeof(uint16_t);
- }
- pic.opaque = reinterpret_cast<void *>(intptr_t(qf.duration));
-
- input_pic = &pic;
-
- frames_being_encoded[qf.pts] = qf.received_ts;
- }
-
- unsigned new_rate = new_bitrate_kbit.load(); // Can be 0 for no change.
- if (speed_control) {
- speed_control->set_config_override_function(bind(&speed_control_override_func, new_rate, qf.ycbcr_coefficients, _1));
- } else {
- x264_param_t param;
- dyn.x264_encoder_parameters(x264, ¶m);
- speed_control_override_func(new_rate, qf.ycbcr_coefficients, ¶m);
- dyn.x264_encoder_reconfig(x264, ¶m);
- }
-
- if (speed_control) {
- float queue_fill_ratio;
- {
- lock_guard<mutex> lock(mu);
- queue_fill_ratio = float(free_frames.size()) / X264_QUEUE_LENGTH;
- }
- speed_control->before_frame(queue_fill_ratio, X264_QUEUE_LENGTH, 1e6 * qf.duration / TIMEBASE);
- }
- dyn.x264_encoder_encode(x264, &nal, &num_nal, input_pic, &pic);
- if (speed_control) {
- speed_control->after_frame();
- }
-
- if (num_nal == 0) return;
-
- if (IS_X264_TYPE_I(pic.i_type)) {
- ++metric_x264_output_frames_i;
- } else if (IS_X264_TYPE_B(pic.i_type)) {
- ++metric_x264_output_frames_b;
- } else {
- ++metric_x264_output_frames_p;
- }
-
- metric_x264_crf.count_event(pic.prop.f_crf_avg);
-
- if (frames_being_encoded.count(pic.i_pts)) {
- ReceivedTimestamps received_ts = frames_being_encoded[pic.i_pts];
- frames_being_encoded.erase(pic.i_pts);
-
- static int frameno = 0;
- print_latency("Current x264 latency (video inputs → network mux):",
- received_ts, (pic.i_type == X264_TYPE_B || pic.i_type == X264_TYPE_BREF),
- &frameno, &x264_latency_histogram);
- } else {
- assert(false);
- }
-
- // We really need one AVPacket for the entire frame, it seems,
- // so combine it all.
- size_t num_bytes = buffered_sei.size();
- for (int i = 0; i < num_nal; ++i) {
- num_bytes += nal[i].i_payload;
- }
-
- unique_ptr<uint8_t[]> data(new uint8_t[num_bytes]);
- uint8_t *ptr = data.get();
-
- if (!buffered_sei.empty()) {
- memcpy(ptr, buffered_sei.data(), buffered_sei.size());
- ptr += buffered_sei.size();
- buffered_sei.clear();
- }
- for (int i = 0; i < num_nal; ++i) {
- memcpy(ptr, nal[i].p_payload, nal[i].i_payload);
- ptr += nal[i].i_payload;
- }
-
- AVPacket pkt;
- memset(&pkt, 0, sizeof(pkt));
- pkt.buf = nullptr;
- pkt.data = data.get();
- pkt.size = num_bytes;
- pkt.stream_index = 0;
- if (pic.b_keyframe) {
- pkt.flags = AV_PKT_FLAG_KEY;
- } else {
- pkt.flags = 0;
- }
- pkt.duration = reinterpret_cast<intptr_t>(pic.opaque);
-
- for (Mux *mux : muxes) {
- mux->add_packet(pkt, pic.i_pts, pic.i_dts);
- }
-}
-
-void X264Encoder::speed_control_override_func(unsigned bitrate_kbit, movit::YCbCrLumaCoefficients ycbcr_coefficients, x264_param_t *param)
-{
- if (bitrate_kbit != 0) {
- param->rc.i_bitrate = bitrate_kbit;
- update_vbv_settings(param);
- }
-
- if (ycbcr_coefficients == YCBCR_REC_709) {
- param->vui.i_colmatrix = 1; // BT.709.
- } else {
- assert(ycbcr_coefficients == YCBCR_REC_601);
- param->vui.i_colmatrix = 6; // BT.601/SMPTE 170M.
- }
-}
projects / nageru / blobdiff