Attempt to fix audio/video desync and fps mayhem when
using screen-direct recording
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parent
5ca83d45cf
commit
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77
src/main.cpp
77
src/main.cpp
@ -16,7 +16,6 @@
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*/
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#include <assert.h>
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#include <libavutil/pixfmt.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string>
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@ -24,7 +23,6 @@
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#include <thread>
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#include <mutex>
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#include <map>
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#include <atomic>
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#include <signal.h>
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#include <sys/stat.h>
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@ -41,6 +39,7 @@
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#include <X11/extensions/Xcomposite.h>
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extern "C" {
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#include <libavutil/pixfmt.h>
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#include <libavcodec/avcodec.h>
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#include <libavformat/avformat.h>
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#include <libavutil/hwcontext.h>
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@ -103,6 +102,14 @@ enum class VideoQuality {
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ULTRA
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};
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static double clock_get_monotonic_seconds() {
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struct timespec ts;
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ts.tv_sec = 0;
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ts.tv_nsec = 0;
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clock_gettime(CLOCK_MONOTONIC, &ts);
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return (double)ts.tv_sec + (double)ts.tv_nsec * 0.000000001;
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}
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static bool x11_supports_composite_named_window_pixmap(Display *dpy) {
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int extension_major;
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int extension_minor;
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@ -320,7 +327,7 @@ std::vector<std::string> get_hardware_acceleration_device_names() {
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}
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// |stream| is only required for non-replay mode
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static void receive_frames(AVCodecContext *av_codec_context, int stream_index, AVStream *stream,
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static void receive_frames(AVCodecContext *av_codec_context, int stream_index, AVStream *stream, AVFrame *frame,
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AVFormatContext *av_format_context,
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double replay_start_time,
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std::deque<AVPacket> &frame_data_queue,
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@ -335,6 +342,7 @@ static void receive_frames(AVCodecContext *av_codec_context, int stream_index, A
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int res = avcodec_receive_packet(av_codec_context, &av_packet);
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if (res == 0) { // we have a packet, send the packet to the muxer
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av_packet.stream_index = stream_index;
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av_packet.pts = av_packet.dts = frame->pts;
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std::lock_guard<std::mutex> lock(write_output_mutex);
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if(replay_buffer_size_secs != -1) {
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@ -350,15 +358,11 @@ static void receive_frames(AVCodecContext *av_codec_context, int stream_index, A
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frames_erased = true;
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}
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} else {
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if(av_packet.pts != AV_NOPTS_VALUE)
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av_packet.pts = av_rescale_q(av_packet.pts, av_codec_context->time_base, stream->time_base);
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if(av_packet.dts != AV_NOPTS_VALUE)
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av_packet.dts = av_rescale_q(av_packet.dts, av_codec_context->time_base, stream->time_base);
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av_packet_rescale_ts(&av_packet, av_codec_context->time_base, stream->time_base);
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av_packet.stream_index = stream->index;
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int ret = av_interleaved_write_frame(av_format_context, &av_packet);
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if(ret < 0) {
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fprintf(stderr, "Error: Failed to write video frame to muxer, reason: %s (%d)\n", av_error_to_string(ret), ret);
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fprintf(stderr, "Error: Failed to write frame index %d to muxer, reason: %s (%d)\n", av_packet.stream_index, av_error_to_string(ret), ret);
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}
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}
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av_packet_unref(&av_packet);
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@ -401,7 +405,9 @@ static AVCodecContext* create_audio_codec_context(AVFormatContext *av_format_con
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codec_context->channels = 2;
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codec_context->time_base.num = 1;
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codec_context->time_base.den = fps;
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codec_context->time_base.den = AV_TIME_BASE;
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codec_context->framerate.num = 1;
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codec_context->framerate.den = fps;
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// Some formats want stream headers to be seperate
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if (av_format_context->oformat->flags & AVFMT_GLOBALHEADER)
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@ -440,9 +446,9 @@ static AVCodecContext *create_video_codec_context(AVFormatContext *av_format_con
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// timebase should be 1/framerate and timestamp increments should be
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// identical to 1
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codec_context->time_base.num = 1;
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codec_context->time_base.den = fps;
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// codec_context->framerate.num = 60;
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// codec_context->framerate.den = 1;
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codec_context->time_base.den = AV_TIME_BASE;
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codec_context->framerate.num = 1;
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codec_context->framerate.den = fps;
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codec_context->sample_aspect_ratio.num = 0;
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codec_context->sample_aspect_ratio.den = 0;
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codec_context->gop_size = fps * 2;
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@ -679,7 +685,7 @@ static AVStream* create_stream(AVFormatContext *av_format_context, AVCodecContex
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}
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stream->id = av_format_context->nb_streams - 1;
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stream->time_base = codec_context->time_base;
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stream->avg_frame_rate = av_inv_q(codec_context->time_base);
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stream->avg_frame_rate = av_inv_q(codec_context->framerate);
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return stream;
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}
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@ -745,19 +751,16 @@ static void save_replay_async(AVCodecContext *video_codec_context, AVCodecContex
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AVPacket &av_packet = save_replay_packets[i];
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AVStream *stream = av_packet.stream_index == video_stream_index ? video_stream : audio_stream;
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if(av_packet.pts != AV_NOPTS_VALUE)
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av_packet.pts = av_rescale_q(av_packet.pts, video_codec_context->time_base, stream->time_base);
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if(av_packet.dts != AV_NOPTS_VALUE)
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av_packet.dts = av_rescale_q(av_packet.dts, video_codec_context->time_base, stream->time_base);
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AVCodecContext *codec_context = av_packet.stream_index == video_stream_index ? video_codec_context : audio_codec_context;
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av_packet.stream_index = stream->index;
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av_packet.pts -= av_rescale_q(pts_offset, video_codec_context->time_base, stream->time_base);
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av_packet.dts -= av_rescale_q(pts_offset, video_codec_context->time_base, stream->time_base);
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av_packet.pts -= pts_offset;
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av_packet.dts -= pts_offset;
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av_packet_rescale_ts(&av_packet, codec_context->time_base, stream->time_base);
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int ret = av_interleaved_write_frame(av_format_context, &av_packet);
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if(ret < 0)
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fprintf(stderr, "Error: Failed to write video frame to muxer, reason: %s (%d)\n", av_error_to_string(ret), ret);
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fprintf(stderr, "Error: Failed to write frame index %d to muxer, reason: %s (%d)\n", stream->index, av_error_to_string(ret), ret);
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}
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if (av_write_trailer(av_format_context) != 0)
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@ -1117,7 +1120,7 @@ int main(int argc, char **argv) {
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XDamageSubtract(dpy, damage,None,None);
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*/
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std::atomic_int frame_count(0);
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const double start_time_pts = clock_get_monotonic_seconds();
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CUcontext old_ctx;
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CUarray mapped_array;
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@ -1188,7 +1191,7 @@ int main(int argc, char **argv) {
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audio_frame_buf = (uint8_t *)av_malloc(audio_buffer_size);
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avcodec_fill_audio_frame(audio_frame, audio_codec_context->channels, audio_codec_context->sample_fmt, (const uint8_t*)audio_frame_buf, audio_buffer_size, 1);
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audio_thread = std::thread([record_start_time, replay_buffer_size_secs, &frame_data_queue, &frames_erased, audio_codec_context, &frame_count](AVFormatContext *av_format_context, AVStream *audio_stream, uint8_t *audio_frame_buf, SoundDevice *sound_device, AVFrame *audio_frame, std::mutex *write_output_mutex) mutable {
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audio_thread = std::thread([record_start_time, replay_buffer_size_secs, &frame_data_queue, &frames_erased, audio_codec_context, start_time_pts, fps](AVFormatContext *av_format_context, AVStream *audio_stream, uint8_t *audio_frame_buf, SoundDevice *sound_device, AVFrame *audio_frame, std::mutex *write_output_mutex) mutable {
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SwrContext *swr = swr_alloc();
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if(!swr) {
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@ -1203,23 +1206,14 @@ int main(int argc, char **argv) {
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av_opt_set_sample_fmt(swr, "out_sample_fmt", AV_SAMPLE_FMT_FLTP, 0);
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swr_init(swr);
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int64_t prev_frame_count = 0;
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while(running) {
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void *sound_buffer;
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int sound_buffer_size = sound_device_read_next_chunk(sound_device, &sound_buffer);
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if(sound_buffer_size >= 0) {
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const int64_t pts = frame_count;
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if(pts == prev_frame_count) {
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prev_frame_count = pts;
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continue;
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}
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prev_frame_count = pts;
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// TODO: Instead of converting audio, get float audio from alsa. Or does alsa do conversion internally to get this format?
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swr_convert(swr, &audio_frame_buf, audio_frame->nb_samples, (const uint8_t**)&sound_buffer, sound_buffer_size);
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audio_frame->extended_data = &audio_frame_buf;
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audio_frame->pts = frame_count;
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audio_frame->pts = (clock_get_monotonic_seconds() - start_time_pts) * AV_TIME_BASE;
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int ret = avcodec_send_frame(audio_codec_context, audio_frame);
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if(ret < 0){
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@ -1227,7 +1221,7 @@ int main(int argc, char **argv) {
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break;
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}
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if(ret >= 0)
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receive_frames(audio_codec_context, AUDIO_STREAM_INDEX, audio_stream, av_format_context, record_start_time, frame_data_queue, replay_buffer_size_secs, frames_erased, *write_output_mutex);
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receive_frames(audio_codec_context, AUDIO_STREAM_INDEX, audio_stream, audio_frame, av_format_context, record_start_time, frame_data_queue, replay_buffer_size_secs, frames_erased, *write_output_mutex);
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} else {
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fprintf(stderr, "failed to read sound from device, error: %d\n", sound_buffer_size);
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}
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@ -1349,6 +1343,14 @@ int main(int argc, char **argv) {
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window_pixmap.texture_id, GL_TEXTURE_2D, 0, 0, 0, 0,
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window_pixmap.target_texture_id, GL_TEXTURE_2D, 0, 0, 0, 0,
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window_pixmap.texture_width, window_pixmap.texture_height, 1);
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int err = glGetError();
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if(err != 0) {
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static bool error_shown = false;
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if(!error_shown) {
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error_shown = true;
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fprintf(stderr, "Error: glCopyImageSubData failed, gl error: %d\n", err);
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}
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}
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glfwSwapBuffers(window);
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// int err = glGetError();
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// fprintf(stderr, "error: %d\n", err);
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@ -1380,10 +1382,9 @@ int main(int argc, char **argv) {
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// res = cuCtxPopCurrent(&old_ctx);
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}
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frame->pts = frame_count;
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frame_count += 1;
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frame->pts = (clock_get_monotonic_seconds() - start_time_pts) * AV_TIME_BASE;
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if (avcodec_send_frame(video_codec_context, frame) >= 0) {
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receive_frames(video_codec_context, VIDEO_STREAM_INDEX, video_stream, av_format_context,
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receive_frames(video_codec_context, VIDEO_STREAM_INDEX, video_stream, frame, av_format_context,
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record_start_time, frame_data_queue, replay_buffer_size_secs, frames_erased, write_output_mutex);
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} else {
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fprintf(stderr, "Error: avcodec_send_frame failed\n");
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