+#include "av1_encoder.h"
+
+#include <assert.h>
+#include <dlfcn.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <atomic>
+#include <cstdint>
+#include <functional>
+#include <mutex>
+
+#include <EbSvtAv1.h>
+#include <EbSvtAv1Enc.h>
+
+#include "defs.h"
+#include "flags.h"
+#include "shared/metrics.h"
+#include "shared/mux.h"
+#include "print_latency.h"
+#include "shared/timebase.h"
+#include "shared/memcpy_interleaved.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 {
+
+// AV1Encoder can be restarted if --record-av1-video is set, so make these
+// metrics global.
+atomic<int64_t> metric_av1_queued_frames{0};
+atomic<int64_t> metric_av1_max_queued_frames{AV1_QUEUE_LENGTH};
+atomic<int64_t> metric_av1_dropped_frames{0};
+atomic<int64_t> metric_av1_output_frames_i{0};
+atomic<int64_t> metric_av1_output_frames_p{0};
+Histogram metric_av1_qp;
+LatencyHistogram av1_latency_histogram;
+
+once_flag av1_metrics_inited;
+
+} // namespace
+
+AV1Encoder::AV1Encoder(const AVOutputFormat *oformat)
+ : wants_global_headers(oformat->flags & AVFMT_GLOBALHEADER)
+{
+ call_once(av1_metrics_inited, []{
+ global_metrics.add("av1_queued_frames", {}, &metric_av1_queued_frames, Metrics::TYPE_GAUGE);
+ global_metrics.add("av1_max_queued_frames", {}, &metric_av1_max_queued_frames, Metrics::TYPE_GAUGE);
+ global_metrics.add("av1_dropped_frames", {}, &metric_av1_dropped_frames);
+ global_metrics.add("av1_output_frames", {{ "type", "i" }}, &metric_av1_output_frames_i);
+ global_metrics.add("av1_output_frames", {{ "type", "p" }}, &metric_av1_output_frames_p);
+
+ metric_av1_qp.init_uniform(50);
+ global_metrics.add("av1_qp", {}, &metric_av1_qp);
+ av1_latency_histogram.init("av1");
+ });
+
+ const size_t bytes_per_pixel = 1; // TODO: 10-bit support.
+ frame_pool.reset(new uint8_t[global_flags.width * global_flags.height * 2 * bytes_per_pixel * AV1_QUEUE_LENGTH]);
+ for (unsigned i = 0; i < AV1_QUEUE_LENGTH; ++i) {
+ free_frames.push(frame_pool.get() + i * (global_flags.width * global_flags.height * 2 * bytes_per_pixel));
+ }
+ encoder_thread = thread(&AV1Encoder::encoder_thread_func, this);
+}
+
+AV1Encoder::~AV1Encoder()
+{
+ should_quit = true;
+ queued_frames_nonempty.notify_all();
+ encoder_thread.join();
+}
+
+void AV1Encoder::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: AV1 queue full, dropping frame with pts %" PRId64 "\n", pts);
+ ++metric_av1_dropped_frames;
+ return;
+ }
+
+ qf.data = free_frames.front();
+ free_frames.pop();
+ }
+
+ // Since we're copying anyway, we can unpack from NV12 to fully planar on the fly.
+ // SVT-AV1 makes its own copy, though, and it would have been nice to avoid the
+ // double-copy.
+ size_t bytes_per_pixel = 1; // TODO: 10-bit support.
+ size_t frame_size = global_flags.width * global_flags.height * bytes_per_pixel;
+ assert(global_flags.width % 2 == 0);
+ assert(global_flags.height % 2 == 0);
+ uint8_t *y = qf.data;
+ uint8_t *cb = y + frame_size;
+ uint8_t *cr = cb + frame_size / 4;
+ memcpy(y, data, frame_size);
+ memcpy_interleaved(cb, cr, data + frame_size, frame_size / 2);
+
+ {
+ lock_guard<mutex> lock(mu);
+ queued_frames.push(qf);
+ queued_frames_nonempty.notify_all();
+ metric_av1_queued_frames = queued_frames.size();
+ }
+}
+
+void AV1Encoder::init_av1()
+{
+ EbSvtAv1EncConfiguration config;
+ EbErrorType ret = svt_av1_enc_init_handle(&encoder, nullptr, &config);
+ if (ret != EB_ErrorNone) {
+ fprintf(stderr, "Error initializing SVT-AV1 handle (error %08x)\n", ret);
+ exit(EXIT_FAILURE);
+ }
+
+ config.enc_mode = global_flags.av1_preset;
+ config.intra_period_length = 63; // Approx. one second, conforms to the (n % 8) - 1 == 0 rule.
+ config.source_width = global_flags.width;
+ config.source_height = global_flags.height;
+ config.frame_rate_numerator = global_flags.av1_fps_num;
+ config.frame_rate_denominator = global_flags.av1_fps_den;
+ config.encoder_bit_depth = 8; // TODO: 10-bit support.
+ config.rate_control_mode = 2; // CBR.
+ config.pred_structure = 1; // PRED_LOW_DELAY_B (needed for CBR).
+ config.target_bit_rate = global_flags.av1_bitrate * 1000;
+
+ // NOTE: These should be in sync with the ones in quicksync_encoder.cpp (sps_rbsp()).
+ config.color_primaries = EB_CICP_CP_BT_709;
+ config.transfer_characteristics = EB_CICP_TC_SRGB;
+ if (global_flags.ycbcr_rec709_coefficients) {
+ config.matrix_coefficients = EB_CICP_MC_BT_709;
+ } else {
+ config.matrix_coefficients = EB_CICP_MC_BT_601;
+ }
+ config.color_range = EB_CR_STUDIO_RANGE;
+#if SVT_AV1_CHECK_VERSION(1, 0, 0)
+ config.chroma_sample_position = EB_CSP_VERTICAL;
+#endif
+
+ const vector<string> &extra_param = global_flags.av1_extra_param;
+ for (const string &str : extra_param) {
+ const size_t pos = str.find(',');
+ if (pos == string::npos) {
+ if (svt_av1_enc_parse_parameter(&config, str.c_str(), nullptr) != EB_ErrorNone) {
+ fprintf(stderr, "ERROR: SVT-AV1 rejected parameter '%s' with no value\n", str.c_str());
+ exit(EXIT_FAILURE);
+ }
+ } else {
+ const string key = str.substr(0, pos);
+ const string value = str.substr(pos + 1);
+ if (svt_av1_enc_parse_parameter(&config, key.c_str(), value.c_str()) != EB_ErrorNone) {
+ fprintf(stderr, "ERROR: SVT-AV1 rejected parameter '%s' set to '%s'\n",
+ key.c_str(), value.c_str());
+ exit(EXIT_FAILURE);
+ }
+ }
+ }
+
+ ret = svt_av1_enc_set_parameter(encoder, &config);
+ if (ret != EB_ErrorNone) {
+ fprintf(stderr, "Error configuring SVT-AV1 (error %08x)\n", ret);
+ exit(EXIT_FAILURE);
+ }
+
+ ret = svt_av1_enc_init(encoder);
+ if (ret != EB_ErrorNone) {
+ fprintf(stderr, "Error initializing SVT-AV1 (error %08x)\n", ret);
+ exit(EXIT_FAILURE);
+ }
+
+ if (wants_global_headers) {
+ EbBufferHeaderType *header = NULL;
+
+ ret = svt_av1_enc_stream_header(encoder, &header);
+ if (ret != EB_ErrorNone) {
+ fprintf(stderr, "Error building SVT-AV1 header (error %08x)\n", ret);
+ exit(EXIT_FAILURE);
+ }
+
+ global_headers = string(reinterpret_cast<const char *>(header->p_buffer), header->n_filled_len);
+
+ svt_av1_enc_stream_header_release(header); // Don't care about errors.
+ }
+}
+
+void AV1Encoder::encoder_thread_func()
+{
+ if (nice(5) == -1) {
+ perror("nice()");
+ // No exit; it's not fatal.
+ }
+ pthread_setname_np(pthread_self(), "AV1_encode");
+ init_av1();
+ av1_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_av1_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 our queue.
+ } while (!should_quit || frames_left);
+
+ // Signal end of stream.
+ EbBufferHeaderType hdr;
+ hdr.n_alloc_len = 0;
+ hdr.n_filled_len = 0;
+ hdr.n_tick_count = 0;
+ hdr.p_app_private = nullptr;
+ hdr.pic_type = EB_AV1_INVALID_PICTURE;
+ hdr.p_buffer = nullptr;
+ hdr.metadata = nullptr;
+ hdr.flags = EB_BUFFERFLAG_EOS;
+ svt_av1_enc_send_picture(encoder, &hdr);
+
+ bool seen_eof = false;
+ do {
+ EbBufferHeaderType *buf;
+ EbErrorType ret = svt_av1_enc_get_packet(encoder, &buf, /*pic_send_done=*/true);
+ if (ret == EB_NoErrorEmptyQueue) {
+ assert(false);
+ }
+ seen_eof = (buf->flags & EB_BUFFERFLAG_EOS);
+ process_packet(buf);
+ } while (!seen_eof);
+
+ svt_av1_enc_deinit(encoder);
+ svt_av1_enc_deinit_handle(encoder);
+}
+
+void AV1Encoder::encode_frame(AV1Encoder::QueuedFrame qf)
+{
+ if (qf.data) {
+ EbSvtIOFormat pic;
+ pic.luma = qf.data;
+ pic.cb = pic.luma + global_flags.width * global_flags.height;
+ pic.cr = pic.cb + global_flags.width * global_flags.height / 4;
+ pic.y_stride = global_flags.width;
+ pic.cb_stride = global_flags.width / 2;
+ pic.cr_stride = global_flags.width / 2;
+ pic.width = global_flags.width;
+ pic.height = global_flags.height;
+ pic.origin_x = 0;
+ pic.origin_y = 0;
+ pic.color_fmt = EB_YUV420;
+ pic.bit_depth = EB_EIGHT_BIT; // TODO: 10-bit.
+
+ EbBufferHeaderType hdr;
+ hdr.p_buffer = reinterpret_cast<uint8_t *>(&pic);
+ hdr.n_alloc_len = global_flags.width * global_flags.height * 3 / 2; // TODO: 10-bit.
+ hdr.n_filled_len = hdr.n_alloc_len;
+ hdr.n_tick_count = 0;
+ hdr.p_app_private = reinterpret_cast<void *>(intptr_t(qf.duration));
+ hdr.pic_type = EB_AV1_INVALID_PICTURE; // Actually means auto, according to FFmpeg.
+ hdr.metadata = nullptr;
+ hdr.flags = 0;
+ hdr.pts = av_rescale_q(qf.pts, AVRational{ 1, TIMEBASE }, AVRational{ global_flags.av1_fps_den, global_flags.av1_fps_num });
+ if (hdr.pts <= last_pts) {
+ fprintf(stderr, "WARNING: Receiving frames faster than given --av1-fps value (%d/%d); dropping frame.\n",
+ global_flags.av1_fps_num, global_flags.av1_fps_den);
+ } else {
+ svt_av1_enc_send_picture(encoder, &hdr);
+ frames_being_encoded[hdr.pts] = qf.received_ts;
+ last_pts = hdr.pts;
+ }
+ }
+
+ for ( ;; ) {
+ EbBufferHeaderType *buf;
+ EbErrorType ret = svt_av1_enc_get_packet(encoder, &buf, /*pic_send_done=*/false);
+ if (ret == EB_NoErrorEmptyQueue) {
+ return;
+ }
+ process_packet(buf);
+ }
+}
+
+void AV1Encoder::process_packet(EbBufferHeaderType *buf)
+{
+ if (buf->n_filled_len == 0) {
+ // TODO: Can this ever happen?
+ svt_av1_enc_release_out_buffer(&buf);
+ return;
+ }
+
+ switch (buf->pic_type) {
+ case EB_AV1_KEY_PICTURE:
+ case EB_AV1_INTRA_ONLY_PICTURE:
+ ++metric_av1_output_frames_i;
+ break;
+ case EB_AV1_INTER_PICTURE: // We don't really know whether it's P or B.
+ ++metric_av1_output_frames_p;
+ break;
+ default:
+ break;
+ }
+ metric_av1_qp.count_event(buf->qp);
+
+ if (frames_being_encoded.count(buf->pts)) {
+ ReceivedTimestamps received_ts = frames_being_encoded[buf->pts];
+ frames_being_encoded.erase(buf->pts);
+
+ static int frameno = 0;
+ print_latency("Current AV1 latency (video inputs → network mux):",
+ received_ts, /*b_frame=*/false, &frameno, &av1_latency_histogram);
+ } else {
+ assert(false);
+ }
+
+ AVPacket pkt;
+ memset(&pkt, 0, sizeof(pkt));
+ pkt.buf = nullptr;
+ pkt.data = buf->p_buffer;
+ pkt.size = buf->n_filled_len;
+ pkt.stream_index = 0;
+ if (buf->pic_type == EB_AV1_KEY_PICTURE) {
+ pkt.flags = AV_PKT_FLAG_KEY;
+ } else if (buf->pic_type == EB_AV1_NON_REF_PICTURE) {
+ // I have no idea if this does anything in practice,
+ // but the libavcodec plugin does it.
+ pkt.flags = AV_PKT_FLAG_DISPOSABLE;
+ } else {
+ pkt.flags = 0;
+ }
+ pkt.pts = av_rescale_q(buf->pts, AVRational{ global_flags.av1_fps_den, global_flags.av1_fps_num }, AVRational{ 1, TIMEBASE });
+ pkt.dts = av_rescale_q(buf->dts, AVRational{ global_flags.av1_fps_den, global_flags.av1_fps_num }, AVRational{ 1, TIMEBASE });
+
+ for (Mux *mux : muxes) {
+ mux->add_packet(pkt, pkt.pts, pkt.dts);
+ }
+
+ svt_av1_enc_release_out_buffer(&buf);
+}
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