git.sesse.net Git - nageru/blob - nageru/video_encoder.cpp

   1 #include "video_encoder.h"
   2
   3 #include <assert.h>
   4 #include <stdio.h>
   5 #include <time.h>
   6 #include <unistd.h>
   7 #include <string>
   8 #include <thread>
   9
  10 extern "C" {
  11 #include <libavutil/mem.h>
  12 }
  13
  14 #include "audio_encoder.h"
  15 #include "defs.h"
  16 #include "shared/ffmpeg_raii.h"
  17 #include "flags.h"
  18 #include "shared/httpd.h"
  19 #include "shared/mux.h"
  20 #include "quicksync_encoder.h"
  21 #include "shared/timebase.h"
  22 #include "x264_encoder.h"
  23
  24 class RefCountedFrame;
  25
  26 using namespace std;
  27 using namespace movit;
  28
  29 namespace {
  30
  31 string generate_local_dump_filename(int frame)
  32 {
  33         time_t now = time(NULL);
  34         tm now_tm;
  35         localtime_r(&now, &now_tm);
  36
  37         char timestamp[64];
  38         strftime(timestamp, sizeof(timestamp), "%F-%H%M%S%z", &now_tm);
  39
  40         // Use the frame number to disambiguate between two cuts starting
  41         // on the same second.
  42         char filename[256];
  43         snprintf(filename, sizeof(filename), "%s/%s%s-f%02d%s",
  44                 global_flags.recording_dir.c_str(),
  45                 LOCAL_DUMP_PREFIX, timestamp, frame % 100, LOCAL_DUMP_SUFFIX);
  46         return filename;
  47 }
  48
  49 }  // namespace
  50
  51 VideoEncoder::VideoEncoder(ResourcePool *resource_pool, QSurface *surface, const std::string &va_display, int width, int height, HTTPD *httpd, DiskSpaceEstimator *disk_space_estimator)
  52         : resource_pool(resource_pool), surface(surface), va_display(va_display), width(width), height(height), httpd(httpd), disk_space_estimator(disk_space_estimator)
  53 {
  54         oformat = av_guess_format(global_flags.stream_mux_name.c_str(), nullptr, nullptr);
  55         assert(oformat != nullptr);
  56         if (global_flags.stream_audio_codec_name.empty()) {
  57                 stream_audio_encoder.reset(new AudioEncoder(AUDIO_OUTPUT_CODEC_NAME, DEFAULT_AUDIO_OUTPUT_BIT_RATE, oformat));
  58         } else {
  59                 stream_audio_encoder.reset(new AudioEncoder(global_flags.stream_audio_codec_name, global_flags.stream_audio_codec_bitrate, oformat));
  60         }
  61         if (global_flags.x264_video_to_http || global_flags.x264_video_to_disk) {
  62                 x264_encoder.reset(new X264Encoder(oformat, /*use_separate_disk_params=*/false));
  63         }
  64         X264Encoder *http_encoder = x264_encoder.get();
  65         X264Encoder *disk_encoder = x264_encoder.get();
  66         if (global_flags.x264_separate_disk_encode) {
  67                 x264_disk_encoder.reset(new X264Encoder(oformat, /*use_separate_disk_params=*/true));
  68                 disk_encoder = x264_disk_encoder.get();
  69         }
  70
  71         string filename = generate_local_dump_filename(/*frame=*/0);
  72         quicksync_encoder.reset(new QuickSyncEncoder(filename, resource_pool, surface, va_display, width, height, oformat, http_encoder, disk_encoder, disk_space_estimator));
  73
  74         open_output_stream();
  75         stream_audio_encoder->add_mux(stream_mux.get());
  76         quicksync_encoder->set_stream_mux(stream_mux.get());
  77         if (global_flags.x264_video_to_http) {
  78                 x264_encoder->add_mux(stream_mux.get());
  79         }
  80 }
  81
  82 VideoEncoder::~VideoEncoder()
  83 {
  84         quicksync_encoder->shutdown();
  85         x264_encoder.reset(nullptr);
  86         x264_disk_encoder.reset(nullptr);
  87         quicksync_encoder->close_file();
  88         quicksync_encoder.reset(nullptr);
  89         while (quicksync_encoders_in_shutdown.load() > 0) {
  90                 usleep(10000);
  91         }
  92 }
  93
  94 void VideoEncoder::do_cut(int frame)
  95 {
  96         string filename = generate_local_dump_filename(frame);
  97         printf("Starting new recording: %s\n", filename.c_str());
  98
  99         // Do the shutdown of the old encoder in a separate thread, since it can
 100         // take some time (it needs to wait for all the frames in the queue to be
 101         // done encoding, for one) and we are running on the main mixer thread.
 102         // However, since this means both encoders could be sending packets at
 103         // the same time, it means pts could come out of order to the stream mux,
 104         // and we need to plug it until the shutdown is complete.
 105         stream_mux->plug();
 106         lock(qs_mu, qs_audio_mu);
 107         lock_guard<mutex> lock1(qs_mu, adopt_lock), lock2(qs_audio_mu, adopt_lock);
 108         QuickSyncEncoder *old_encoder = quicksync_encoder.release();  // When we go C++14, we can use move capture instead.
 109         X264Encoder *old_x264_encoder = nullptr;
 110         X264Encoder *old_x264_disk_encoder = nullptr;
 111         if (global_flags.x264_video_to_disk) {
 112                 old_x264_encoder = x264_encoder.release();
 113         }
 114         if (global_flags.x264_separate_disk_encode) {
 115                 old_x264_disk_encoder = x264_disk_encoder.release();
 116         }
 117         thread([old_encoder, old_x264_encoder, old_x264_disk_encoder, this]{
 118                 old_encoder->shutdown();
 119                 delete old_x264_encoder;
 120                 delete old_x264_disk_encoder;
 121                 old_encoder->close_file();
 122                 stream_mux->unplug();
 123
 124                 // We cannot delete the encoder here, as this thread has no OpenGL context.
 125                 // We'll deal with it in begin_frame().
 126                 lock_guard<mutex> lock(qs_mu);
 127                 qs_needing_cleanup.emplace_back(old_encoder);
 128         }).detach();
 129
 130         if (global_flags.x264_video_to_disk) {
 131                 x264_encoder.reset(new X264Encoder(oformat, /*use_separate_disk_params=*/false));
 132                 assert(global_flags.x264_video_to_http);
 133                 if (global_flags.x264_video_to_http) {
 134                         x264_encoder->add_mux(stream_mux.get());
 135                 }
 136                 if (overriding_bitrate != 0) {
 137                         x264_encoder->change_bitrate(overriding_bitrate);
 138                 }
 139         }
 140         X264Encoder *http_encoder = x264_encoder.get();
 141         X264Encoder *disk_encoder = x264_encoder.get();
 142         if (global_flags.x264_separate_disk_encode) {
 143                 x264_disk_encoder.reset(new X264Encoder(oformat, /*use_separate_disk_params=*/true));
 144                 disk_encoder = x264_disk_encoder.get();
 145         }
 146
 147         quicksync_encoder.reset(new QuickSyncEncoder(filename, resource_pool, surface, va_display, width, height, oformat, http_encoder, disk_encoder, disk_space_estimator));
 148         quicksync_encoder->set_stream_mux(stream_mux.get());
 149 }
 150
 151 void VideoEncoder::change_x264_bitrate(unsigned rate_kbit)
 152 {
 153         overriding_bitrate = rate_kbit;
 154         x264_encoder->change_bitrate(rate_kbit);
 155 }
 156
 157 void VideoEncoder::add_audio(int64_t pts, std::vector<float> audio)
 158 {
 159         // Take only qs_audio_mu, since add_audio() is thread safe
 160         // (we can only conflict with do_cut(), which takes qs_audio_mu)
 161         // and we don't want to contend with begin_frame().
 162         {
 163                 lock_guard<mutex> lock(qs_audio_mu);
 164                 quicksync_encoder->add_audio(pts, audio);
 165         }
 166         stream_audio_encoder->encode_audio(audio, pts + quicksync_encoder->global_delay());
 167 }
 168
 169 bool VideoEncoder::is_zerocopy() const
 170 {
 171         // Explicitly do _not_ take qs_mu; this is called from the mixer,
 172         // and qs_mu might be contended. is_zerocopy() is thread safe
 173         // and never called in parallel with do_cut() (both happen only
 174         // from the mixer thread).
 175         return quicksync_encoder->is_zerocopy();
 176 }
 177
 178 bool VideoEncoder::begin_frame(int64_t pts, int64_t duration, movit::YCbCrLumaCoefficients ycbcr_coefficients, const std::vector<RefCountedFrame> &input_frames, GLuint *y_tex, GLuint *cbcr_tex)
 179 {
 180         lock_guard<mutex> lock(qs_mu);
 181         qs_needing_cleanup.clear();  // Since we have an OpenGL context here, and are called regularly.
 182         return quicksync_encoder->begin_frame(pts, duration, ycbcr_coefficients, input_frames, y_tex, cbcr_tex);
 183 }
 184
 185 RefCountedGLsync VideoEncoder::end_frame()
 186 {
 187         lock_guard<mutex> lock(qs_mu);
 188         return quicksync_encoder->end_frame();
 189 }
 190
 191 void VideoEncoder::open_output_stream()
 192 {
 193         AVFormatContext *avctx = avformat_alloc_context();
 194         avctx->oformat = oformat;
 195
 196         uint8_t *buf = (uint8_t *)av_malloc(MUX_BUFFER_SIZE);
 197         avctx->pb = avio_alloc_context(buf, MUX_BUFFER_SIZE, 1, this, nullptr, nullptr, nullptr);
 198         avctx->pb->write_data_type = &VideoEncoder::write_packet2_thunk;
 199         avctx->pb->ignore_boundary_point = 1;
 200
 201         Mux::Codec video_codec;
 202         if (global_flags.uncompressed_video_to_http) {
 203                 video_codec = Mux::CODEC_NV12;
 204         } else {
 205                 video_codec = Mux::CODEC_H264;
 206         }
 207
 208         avctx->flags = AVFMT_FLAG_CUSTOM_IO;
 209
 210         string video_extradata;
 211         if (global_flags.x264_video_to_http || global_flags.x264_video_to_disk) {
 212                 video_extradata = x264_encoder->get_global_headers();
 213         }
 214
 215         stream_mux.reset(new Mux(avctx, width, height, video_codec, video_extradata, stream_audio_encoder->get_codec_parameters().get(),
 216                 get_color_space(global_flags.ycbcr_rec709_coefficients), COARSE_TIMEBASE,
 217                 /*write_callback=*/nullptr, Mux::WRITE_FOREGROUND, { &stream_mux_metrics }));
 218         stream_mux_metrics.init({{ "destination", "http" }});
 219 }
 220
 221 int VideoEncoder::write_packet2_thunk(void *opaque, uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time)
 222 {
 223         VideoEncoder *video_encoder = (VideoEncoder *)opaque;
 224         return video_encoder->write_packet2(buf, buf_size, type, time);
 225 }
 226
 227 int VideoEncoder::write_packet2(uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time)
 228 {
 229         if (type == AVIO_DATA_MARKER_SYNC_POINT || type == AVIO_DATA_MARKER_BOUNDARY_POINT) {
 230                 seen_sync_markers = true;
 231         } else if (type == AVIO_DATA_MARKER_UNKNOWN && !seen_sync_markers) {
 232                 // We don't know if this is a keyframe or not (the muxer could
 233                 // avoid marking it), so we just have to make the best of it.
 234                 type = AVIO_DATA_MARKER_SYNC_POINT;
 235         }
 236
 237         if (type == AVIO_DATA_MARKER_HEADER) {
 238                 stream_mux_header.append((char *)buf, buf_size);
 239                 httpd->set_header(HTTPD::StreamID{ HTTPD::MAIN_STREAM, 0 }, stream_mux_header);
 240         } else {
 241                 httpd->add_data(HTTPD::StreamID{ HTTPD::MAIN_STREAM, 0 }, (char *)buf, buf_size, type == AVIO_DATA_MARKER_SYNC_POINT, time, AVRational{ AV_TIME_BASE, 1 });
 242         }
 243         return buf_size;
 244 }
 245