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

   1 #include "video_encoder.h"
   2
   3 #include <assert.h>
   4
   5 #include <string>
   6
   7 #include "defs.h"
   8 #include "flags.h"
   9 #include "httpd.h"
  10 #include "timebase.h"
  11 #include "quicksync_encoder.h"
  12
  13 using namespace std;
  14
  15 namespace {
  16
  17 string generate_local_dump_filename(int frame)
  18 {
  19         time_t now = time(NULL);
  20         tm now_tm;
  21         localtime_r(&now, &now_tm);
  22
  23         char timestamp[256];
  24         strftime(timestamp, sizeof(timestamp), "%F-%T%z", &now_tm);
  25
  26         // Use the frame number to disambiguate between two cuts starting
  27         // on the same second.
  28         char filename[256];
  29         snprintf(filename, sizeof(filename), "%s%s-f%02d%s",
  30                 LOCAL_DUMP_PREFIX, timestamp, frame % 100, LOCAL_DUMP_SUFFIX);
  31         return filename;
  32 }
  33
  34 }  // namespace
  35
  36 VideoEncoder::VideoEncoder(QSurface *surface, const std::string &va_display, int width, int height, HTTPD *httpd)
  37         : surface(surface), va_display(va_display), width(width), height(height), httpd(httpd)
  38 {
  39         open_output_stream();
  40
  41         quicksync_encoder.reset(new QuickSyncEncoder(surface, va_display, width, height, stream_mux.get()));
  42         quicksync_encoder->open_output_file(generate_local_dump_filename(/*frame=*/0).c_str());
  43 }
  44
  45 VideoEncoder::~VideoEncoder()
  46 {
  47         quicksync_encoder.reset(nullptr);
  48         close_output_stream();
  49 }
  50
  51 void VideoEncoder::do_cut(int frame)
  52 {
  53         string filename = generate_local_dump_filename(frame);
  54         printf("Starting new recording: %s\n", filename.c_str());
  55         quicksync_encoder->close_output_file();
  56         quicksync_encoder->shutdown();
  57         quicksync_encoder.reset(new QuickSyncEncoder(surface, va_display, width, height, stream_mux.get()));
  58         quicksync_encoder->open_output_file(filename.c_str());
  59 }
  60
  61 void VideoEncoder::add_audio(int64_t pts, std::vector<float> audio)
  62 {
  63         quicksync_encoder->add_audio(pts, audio);
  64 }
  65
  66 bool VideoEncoder::begin_frame(GLuint *y_tex, GLuint *cbcr_tex)
  67 {
  68         return quicksync_encoder->begin_frame(y_tex, cbcr_tex);
  69 }
  70
  71 RefCountedGLsync VideoEncoder::end_frame(int64_t pts, int64_t duration, const std::vector<RefCountedFrame> &input_frames)
  72 {
  73         return quicksync_encoder->end_frame(pts, duration, input_frames);
  74 }
  75
  76 void VideoEncoder::open_output_stream()
  77 {
  78         AVFormatContext *avctx = avformat_alloc_context();
  79         AVOutputFormat *oformat = av_guess_format(global_flags.stream_mux_name.c_str(), nullptr, nullptr);
  80         assert(oformat != nullptr);
  81         avctx->oformat = oformat;
  82
  83         string codec_name;
  84         int bit_rate;
  85
  86         if (global_flags.stream_audio_codec_name.empty()) {
  87                 codec_name = AUDIO_OUTPUT_CODEC_NAME;
  88                 bit_rate = DEFAULT_AUDIO_OUTPUT_BIT_RATE;
  89         } else {
  90                 codec_name = global_flags.stream_audio_codec_name;
  91                 bit_rate = global_flags.stream_audio_codec_bitrate;
  92         }
  93
  94         uint8_t *buf = (uint8_t *)av_malloc(MUX_BUFFER_SIZE);
  95         avctx->pb = avio_alloc_context(buf, MUX_BUFFER_SIZE, 1, this, nullptr, &VideoEncoder::write_packet_thunk, nullptr);
  96
  97         Mux::Codec video_codec;
  98         if (global_flags.uncompressed_video_to_http) {
  99                 video_codec = Mux::CODEC_NV12;
 100         } else {
 101                 video_codec = Mux::CODEC_H264;
 102         }
 103
 104         avctx->flags = AVFMT_FLAG_CUSTOM_IO;
 105         AVCodec *codec_audio = avcodec_find_encoder_by_name(codec_name.c_str());
 106         if (codec_audio == nullptr) {
 107                 fprintf(stderr, "ERROR: Could not find codec '%s'\n", codec_name.c_str());
 108                 exit(1);
 109         }
 110
 111         int time_base = global_flags.stream_coarse_timebase ? COARSE_TIMEBASE : TIMEBASE;
 112         stream_mux_writing_header = true;
 113         stream_mux.reset(new Mux(avctx, width, height, video_codec, codec_audio, time_base, bit_rate, this));
 114         stream_mux_writing_header = false;
 115         httpd->set_header(stream_mux_header);
 116         stream_mux_header.clear();
 117 }
 118
 119 void VideoEncoder::close_output_stream()
 120 {
 121         stream_mux.reset();
 122 }
 123
 124 int VideoEncoder::write_packet_thunk(void *opaque, uint8_t *buf, int buf_size)
 125 {
 126         VideoEncoder *video_encoder = (VideoEncoder *)opaque;
 127         return video_encoder->write_packet(buf, buf_size);
 128 }
 129
 130 int VideoEncoder::write_packet(uint8_t *buf, int buf_size)
 131 {
 132         if (stream_mux_writing_header) {
 133                 stream_mux_header.append((char *)buf, buf_size);
 134         } else {
 135                 httpd->add_data((char *)buf, buf_size, stream_mux_writing_keyframes);
 136                 stream_mux_writing_keyframes = false;
 137         }
 138         return buf_size;
 139 }
 140