git.sesse.net Git - nageru/blob - 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 "ffmpeg_raii.h"
  17 #include "flags.h"
  18 #include "httpd.h"
  19 #include "mux.h"
  20 #include "quicksync_encoder.h"
  21 #include "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[256];
  38         strftime(timestamp, sizeof(timestamp), "%F-%T%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-f%02d%s",
  44                 LOCAL_DUMP_PREFIX, timestamp, frame % 100, LOCAL_DUMP_SUFFIX);
  45         return filename;
  46 }
  47
  48 }  // namespace
  49
  50 VideoEncoder::VideoEncoder(ResourcePool *resource_pool, QSurface *surface, const std::string &va_display, int width, int height, HTTPD *httpd, DiskSpaceEstimator *disk_space_estimator)
  51         : resource_pool(resource_pool), surface(surface), va_display(va_display), width(width), height(height), httpd(httpd), disk_space_estimator(disk_space_estimator)
  52 {
  53         oformat = av_guess_format(global_flags.stream_mux_name.c_str(), nullptr, nullptr);
  54         assert(oformat != nullptr);
  55         if (global_flags.stream_audio_codec_name.empty()) {
  56                 stream_audio_encoder.reset(new AudioEncoder(AUDIO_OUTPUT_CODEC_NAME, DEFAULT_AUDIO_OUTPUT_BIT_RATE, oformat));
  57         } else {
  58                 stream_audio_encoder.reset(new AudioEncoder(global_flags.stream_audio_codec_name, global_flags.stream_audio_codec_bitrate, oformat));
  59         }
  60         if (global_flags.x264_video_to_http || global_flags.x264_video_to_disk) {
  61                 x264_encoder.reset(new X264Encoder(oformat));
  62         }
  63
  64         string filename = generate_local_dump_filename(/*frame=*/0);
  65         quicksync_encoder.reset(new QuickSyncEncoder(filename, resource_pool, surface, va_display, width, height, oformat, x264_encoder.get(), disk_space_estimator));
  66
  67         open_output_stream();
  68         stream_audio_encoder->add_mux(stream_mux.get());
  69         quicksync_encoder->set_stream_mux(stream_mux.get());
  70         if (global_flags.x264_video_to_http) {
  71                 x264_encoder->add_mux(stream_mux.get());
  72         }
  73 }
  74
  75 VideoEncoder::~VideoEncoder()
  76 {
  77         quicksync_encoder->shutdown();
  78         x264_encoder.reset(nullptr);
  79         quicksync_encoder->close_file();
  80         quicksync_encoder.reset(nullptr);
  81         while (quicksync_encoders_in_shutdown.load() > 0) {
  82                 usleep(10000);
  83         }
  84 }
  85
  86 void VideoEncoder::do_cut(int frame)
  87 {
  88         string filename = generate_local_dump_filename(frame);
  89         printf("Starting new recording: %s\n", filename.c_str());
  90
  91         // Do the shutdown of the old encoder in a separate thread, since it can
  92         // take some time (it needs to wait for all the frames in the queue to be
  93         // done encoding, for one) and we are running on the main mixer thread.
  94         // However, since this means both encoders could be sending packets at
  95         // the same time, it means pts could come out of order to the stream mux,
  96         // and we need to plug it until the shutdown is complete.
  97         stream_mux->plug();
  98         lock_guard<mutex> lock(qs_mu);
  99         QuickSyncEncoder *old_encoder = quicksync_encoder.release();  // When we go C++14, we can use move capture instead.
 100         X264Encoder *old_x264_encoder = nullptr;
 101         if (global_flags.x264_video_to_disk) {
 102                 old_x264_encoder = x264_encoder.release();
 103         }
 104         thread([old_encoder, old_x264_encoder, this]{
 105                 old_encoder->shutdown();
 106                 delete old_x264_encoder;
 107                 old_encoder->close_file();
 108                 stream_mux->unplug();
 109
 110                 // We cannot delete the encoder here, as this thread has no OpenGL context.
 111                 // We'll deal with it in begin_frame().
 112                 lock_guard<mutex> lock(qs_mu);
 113                 qs_needing_cleanup.emplace_back(old_encoder);
 114         }).detach();
 115
 116         if (global_flags.x264_video_to_disk) {
 117                 x264_encoder.reset(new X264Encoder(oformat));
 118                 if (global_flags.x264_video_to_http) {
 119                         x264_encoder->add_mux(stream_mux.get());
 120                 }
 121                 if (overriding_bitrate != 0) {
 122                         x264_encoder->change_bitrate(overriding_bitrate);
 123                 }
 124         }
 125
 126         quicksync_encoder.reset(new QuickSyncEncoder(filename, resource_pool, surface, va_display, width, height, oformat, x264_encoder.get(), disk_space_estimator));
 127         quicksync_encoder->set_stream_mux(stream_mux.get());
 128 }
 129
 130 void VideoEncoder::change_x264_bitrate(unsigned rate_kbit)
 131 {
 132         overriding_bitrate = rate_kbit;
 133         x264_encoder->change_bitrate(rate_kbit);
 134 }
 135
 136 void VideoEncoder::add_audio(int64_t pts, std::vector<float> audio)
 137 {
 138         lock_guard<mutex> lock(qs_mu);
 139         quicksync_encoder->add_audio(pts, audio);
 140         stream_audio_encoder->encode_audio(audio, pts + quicksync_encoder->global_delay());
 141 }
 142
 143 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)
 144 {
 145         lock_guard<mutex> lock(qs_mu);
 146         qs_needing_cleanup.clear();  // Since we have an OpenGL context here, and are called regularly.
 147         return quicksync_encoder->begin_frame(pts, duration, ycbcr_coefficients, input_frames, y_tex, cbcr_tex);
 148 }
 149
 150 RefCountedGLsync VideoEncoder::end_frame()
 151 {
 152         lock_guard<mutex> lock(qs_mu);
 153         return quicksync_encoder->end_frame();
 154 }
 155
 156 void VideoEncoder::open_output_stream()
 157 {
 158         AVFormatContext *avctx = avformat_alloc_context();
 159         avctx->oformat = oformat;
 160
 161         uint8_t *buf = (uint8_t *)av_malloc(MUX_BUFFER_SIZE);
 162         avctx->pb = avio_alloc_context(buf, MUX_BUFFER_SIZE, 1, this, nullptr, nullptr, nullptr);
 163         avctx->pb->write_data_type = &VideoEncoder::write_packet2_thunk;
 164         avctx->pb->ignore_boundary_point = 1;
 165
 166         Mux::Codec video_codec;
 167         if (global_flags.uncompressed_video_to_http) {
 168                 video_codec = Mux::CODEC_NV12;
 169         } else {
 170                 video_codec = Mux::CODEC_H264;
 171         }
 172
 173         avctx->flags = AVFMT_FLAG_CUSTOM_IO;
 174
 175         string video_extradata;
 176         if (global_flags.x264_video_to_http || global_flags.x264_video_to_disk) {
 177                 video_extradata = x264_encoder->get_global_headers();
 178         }
 179
 180         int time_base = global_flags.stream_coarse_timebase ? COARSE_TIMEBASE : TIMEBASE;
 181         stream_mux.reset(new Mux(avctx, width, height, video_codec, video_extradata, stream_audio_encoder->get_codec_parameters().get(), time_base,
 182                 /*write_callback=*/nullptr));
 183 }
 184
 185 int VideoEncoder::write_packet2_thunk(void *opaque, uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time)
 186 {
 187         VideoEncoder *video_encoder = (VideoEncoder *)opaque;
 188         return video_encoder->write_packet2(buf, buf_size, type, time);
 189 }
 190
 191 int VideoEncoder::write_packet2(uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time)
 192 {
 193         if (type == AVIO_DATA_MARKER_SYNC_POINT || type == AVIO_DATA_MARKER_BOUNDARY_POINT) {
 194                 seen_sync_markers = true;
 195         } else if (type == AVIO_DATA_MARKER_UNKNOWN && !seen_sync_markers) {
 196                 // We don't know if this is a keyframe or not (the muxer could
 197                 // avoid marking it), so we just have to make the best of it.
 198                 type = AVIO_DATA_MARKER_SYNC_POINT;
 199         }
 200
 201         if (type == AVIO_DATA_MARKER_HEADER) {
 202                 stream_mux_header.append((char *)buf, buf_size);
 203                 httpd->set_header(stream_mux_header);
 204         } else {
 205                 httpd->add_data((char *)buf, buf_size, type == AVIO_DATA_MARKER_SYNC_POINT);
 206         }
 207         return buf_size;
 208 }
 209