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         if (global_flags.stream_audio_codec_name.empty()) {
  42                 stream_audio_encoder.reset(new AudioEncoder(AUDIO_OUTPUT_CODEC_NAME, DEFAULT_AUDIO_OUTPUT_BIT_RATE));
  43         } else {
  44                 stream_audio_encoder.reset(new AudioEncoder(global_flags.stream_audio_codec_name, global_flags.stream_audio_codec_bitrate));
  45         }
  46         stream_audio_encoder->add_mux(stream_mux.get());
  47
  48         string filename = generate_local_dump_filename(/*frame=*/0);
  49         quicksync_encoder.reset(new QuickSyncEncoder(filename, surface, va_display, width, height, stream_mux.get(), stream_audio_encoder.get()));
  50 }
  51
  52 VideoEncoder::~VideoEncoder()
  53 {
  54         quicksync_encoder.reset(nullptr);
  55         close_output_stream();
  56 }
  57
  58 void VideoEncoder::do_cut(int frame)
  59 {
  60         string filename = generate_local_dump_filename(frame);
  61         printf("Starting new recording: %s\n", filename.c_str());
  62         quicksync_encoder->shutdown();
  63         quicksync_encoder.reset(new QuickSyncEncoder(filename, surface, va_display, width, height, stream_mux.get(), stream_audio_encoder.get()));
  64 }
  65
  66 void VideoEncoder::add_audio(int64_t pts, std::vector<float> audio)
  67 {
  68         quicksync_encoder->add_audio(pts, audio);
  69 }
  70
  71 bool VideoEncoder::begin_frame(GLuint *y_tex, GLuint *cbcr_tex)
  72 {
  73         return quicksync_encoder->begin_frame(y_tex, cbcr_tex);
  74 }
  75
  76 RefCountedGLsync VideoEncoder::end_frame(int64_t pts, int64_t duration, const std::vector<RefCountedFrame> &input_frames)
  77 {
  78         return quicksync_encoder->end_frame(pts, duration, input_frames);
  79 }
  80
  81 void VideoEncoder::open_output_stream()
  82 {
  83         AVFormatContext *avctx = avformat_alloc_context();
  84         AVOutputFormat *oformat = av_guess_format(global_flags.stream_mux_name.c_str(), nullptr, nullptr);
  85         assert(oformat != nullptr);
  86         avctx->oformat = oformat;
  87
  88         string codec_name;
  89         int bit_rate;
  90
  91         if (global_flags.stream_audio_codec_name.empty()) {
  92                 codec_name = AUDIO_OUTPUT_CODEC_NAME;
  93                 bit_rate = DEFAULT_AUDIO_OUTPUT_BIT_RATE;
  94         } else {
  95                 codec_name = global_flags.stream_audio_codec_name;
  96                 bit_rate = global_flags.stream_audio_codec_bitrate;
  97         }
  98
  99         uint8_t *buf = (uint8_t *)av_malloc(MUX_BUFFER_SIZE);
 100         avctx->pb = avio_alloc_context(buf, MUX_BUFFER_SIZE, 1, this, nullptr, &VideoEncoder::write_packet_thunk, nullptr);
 101
 102         Mux::Codec video_codec;
 103         if (global_flags.uncompressed_video_to_http) {
 104                 video_codec = Mux::CODEC_NV12;
 105         } else {
 106                 video_codec = Mux::CODEC_H264;
 107         }
 108
 109         avctx->flags = AVFMT_FLAG_CUSTOM_IO;
 110         AVCodec *codec_audio = avcodec_find_encoder_by_name(codec_name.c_str());
 111         if (codec_audio == nullptr) {
 112                 fprintf(stderr, "ERROR: Could not find codec '%s'\n", codec_name.c_str());
 113                 exit(1);
 114         }
 115
 116         int time_base = global_flags.stream_coarse_timebase ? COARSE_TIMEBASE : TIMEBASE;
 117         stream_mux_writing_header = true;
 118         stream_mux.reset(new Mux(avctx, width, height, video_codec, codec_audio, time_base, bit_rate, this));
 119         stream_mux_writing_header = false;
 120         httpd->set_header(stream_mux_header);
 121         stream_mux_header.clear();
 122 }
 123
 124 void VideoEncoder::close_output_stream()
 125 {
 126         stream_mux.reset();
 127 }
 128
 129 int VideoEncoder::write_packet_thunk(void *opaque, uint8_t *buf, int buf_size)
 130 {
 131         VideoEncoder *video_encoder = (VideoEncoder *)opaque;
 132         return video_encoder->write_packet(buf, buf_size);
 133 }
 134
 135 int VideoEncoder::write_packet(uint8_t *buf, int buf_size)
 136 {
 137         if (stream_mux_writing_header) {
 138                 stream_mux_header.append((char *)buf, buf_size);
 139         } else {
 140                 httpd->add_data((char *)buf, buf_size, stream_mux_writing_keyframes);
 141                 stream_mux_writing_keyframes = false;
 142         }
 143         return buf_size;
 144 }
 145