PapaTutuWawa/gpu-screen-recorder
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Attempt to fix audio/video desync and fps mayhem when

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using screen-direct recording
This commit is contained in:
dec05eba 2022-03-28 04:31:52 +02:00
parent 5ca83d45cf
commit 5a4d8ce21b
1 changed files with 39 additions and 38 deletions
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77
src/main.cpp
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@ -16,7 +16,6 @@
*/
#include <assert.h>
#include <libavutil/pixfmt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string>
@ -24,7 +23,6 @@
#include <thread>
#include <mutex>
#include <map>
#include <atomic>
#include <signal.h>
#include <sys/stat.h>
@ -41,6 +39,7 @@
#include <X11/extensions/Xcomposite.h>
extern "C" {
#include <libavutil/pixfmt.h>
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libavutil/hwcontext.h>
@ -103,6 +102,14 @@ enum class VideoQuality {
ULTRA
};
static double clock_get_monotonic_seconds() {
struct timespec ts;
ts.tv_sec = 0;
ts.tv_nsec = 0;
clock_gettime(CLOCK_MONOTONIC, &ts);
return (double)ts.tv_sec + (double)ts.tv_nsec * 0.000000001;
}
static bool x11_supports_composite_named_window_pixmap(Display *dpy) {
int extension_major;
int extension_minor;
@ -320,7 +327,7 @@ std::vector<std::string> get_hardware_acceleration_device_names() {
}
// |stream| is only required for non-replay mode
static void receive_frames(AVCodecContext *av_codec_context, int stream_index, AVStream *stream,
static void receive_frames(AVCodecContext *av_codec_context, int stream_index, AVStream *stream, AVFrame *frame,
AVFormatContext *av_format_context,
double replay_start_time,
std::deque<AVPacket> &frame_data_queue,
@ -335,6 +342,7 @@ static void receive_frames(AVCodecContext *av_codec_context, int stream_index, A
int res = avcodec_receive_packet(av_codec_context, &av_packet);
if (res == 0) { // we have a packet, send the packet to the muxer
av_packet.stream_index = stream_index;
av_packet.pts = av_packet.dts = frame->pts;
std::lock_guard<std::mutex> lock(write_output_mutex);
if(replay_buffer_size_secs != -1) {
@ -350,15 +358,11 @@ static void receive_frames(AVCodecContext *av_codec_context, int stream_index, A
frames_erased = true;
}
} else {
if(av_packet.pts != AV_NOPTS_VALUE)
av_packet.pts = av_rescale_q(av_packet.pts, av_codec_context->time_base, stream->time_base);
if(av_packet.dts != AV_NOPTS_VALUE)
av_packet.dts = av_rescale_q(av_packet.dts, av_codec_context->time_base, stream->time_base);
av_packet_rescale_ts(&av_packet, av_codec_context->time_base, stream->time_base);
av_packet.stream_index = stream->index;
int ret = av_interleaved_write_frame(av_format_context, &av_packet);
if(ret < 0) {
fprintf(stderr, "Error: Failed to write video frame to muxer, reason: %s (%d)\n", av_error_to_string(ret), ret);
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);
}
}
av_packet_unref(&av_packet);
@ -401,7 +405,9 @@ static AVCodecContext* create_audio_codec_context(AVFormatContext *av_format_con
codec_context->channels = 2;
codec_context->time_base.num = 1;
codec_context->time_base.den = fps;
codec_context->time_base.den = AV_TIME_BASE;
codec_context->framerate.num = 1;
codec_context->framerate.den = fps;
// Some formats want stream headers to be seperate
if (av_format_context->oformat->flags & AVFMT_GLOBALHEADER)
@ -440,9 +446,9 @@ static AVCodecContext *create_video_codec_context(AVFormatContext *av_format_con
// timebase should be 1/framerate and timestamp increments should be
// identical to 1
codec_context->time_base.num = 1;
codec_context->time_base.den = fps;
// codec_context->framerate.num = 60;
// codec_context->framerate.den = 1;
codec_context->time_base.den = AV_TIME_BASE;
codec_context->framerate.num = 1;
codec_context->framerate.den = fps;
codec_context->sample_aspect_ratio.num = 0;
codec_context->sample_aspect_ratio.den = 0;
codec_context->gop_size = fps * 2;
@ -679,7 +685,7 @@ static AVStream* create_stream(AVFormatContext *av_format_context, AVCodecContex
}
stream->id = av_format_context->nb_streams - 1;
stream->time_base = codec_context->time_base;
stream->avg_frame_rate = av_inv_q(codec_context->time_base);
stream->avg_frame_rate = av_inv_q(codec_context->framerate);
return stream;
}
@ -745,19 +751,16 @@ static void save_replay_async(AVCodecContext *video_codec_context, AVCodecContex
AVPacket &av_packet = save_replay_packets[i];
AVStream *stream = av_packet.stream_index == video_stream_index ? video_stream : audio_stream;
if(av_packet.pts != AV_NOPTS_VALUE)
av_packet.pts = av_rescale_q(av_packet.pts, video_codec_context->time_base, stream->time_base);
if(av_packet.dts != AV_NOPTS_VALUE)
av_packet.dts = av_rescale_q(av_packet.dts, video_codec_context->time_base, stream->time_base);
AVCodecContext *codec_context = av_packet.stream_index == video_stream_index ? video_codec_context : audio_codec_context;
av_packet.stream_index = stream->index;
av_packet.pts -= av_rescale_q(pts_offset, video_codec_context->time_base, stream->time_base);
av_packet.dts -= av_rescale_q(pts_offset, video_codec_context->time_base, stream->time_base);
av_packet.pts -= pts_offset;
av_packet.dts -= pts_offset;
av_packet_rescale_ts(&av_packet, codec_context->time_base, stream->time_base);
int ret = av_interleaved_write_frame(av_format_context, &av_packet);
if(ret < 0)
fprintf(stderr, "Error: Failed to write video frame to muxer, reason: %s (%d)\n", av_error_to_string(ret), ret);
fprintf(stderr, "Error: Failed to write frame index %d to muxer, reason: %s (%d)\n", stream->index, av_error_to_string(ret), ret);
}
if (av_write_trailer(av_format_context) != 0)
@ -1117,7 +1120,7 @@ int main(int argc, char **argv) {
XDamageSubtract(dpy, damage,None,None);
*/
std::atomic_int frame_count(0);
const double start_time_pts = clock_get_monotonic_seconds();
CUcontext old_ctx;
CUarray mapped_array;
@ -1188,7 +1191,7 @@ int main(int argc, char **argv) {
audio_frame_buf = (uint8_t *)av_malloc(audio_buffer_size);
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);
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 {
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 {
SwrContext *swr = swr_alloc();
if(!swr) {
@ -1203,23 +1206,14 @@ int main(int argc, char **argv) {
av_opt_set_sample_fmt(swr, "out_sample_fmt", AV_SAMPLE_FMT_FLTP, 0);
swr_init(swr);
int64_t prev_frame_count = 0;
while(running) {
void *sound_buffer;
int sound_buffer_size = sound_device_read_next_chunk(sound_device, &sound_buffer);
if(sound_buffer_size >= 0) {
const int64_t pts = frame_count;
if(pts == prev_frame_count) {
prev_frame_count = pts;
continue;
}
prev_frame_count = pts;
// TODO: Instead of converting audio, get float audio from alsa. Or does alsa do conversion internally to get this format?
swr_convert(swr, &audio_frame_buf, audio_frame->nb_samples, (const uint8_t**)&sound_buffer, sound_buffer_size);
audio_frame->extended_data = &audio_frame_buf;
audio_frame->pts = frame_count;
audio_frame->pts = (clock_get_monotonic_seconds() - start_time_pts) * AV_TIME_BASE;
int ret = avcodec_send_frame(audio_codec_context, audio_frame);
if(ret < 0){
@ -1227,7 +1221,7 @@ int main(int argc, char **argv) {
break;
}
if(ret >= 0)
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);
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);
} else {
fprintf(stderr, "failed to read sound from device, error: %d\n", sound_buffer_size);
}
@ -1349,6 +1343,14 @@ int main(int argc, char **argv) {
window_pixmap.texture_id, GL_TEXTURE_2D, 0, 0, 0, 0,
window_pixmap.target_texture_id, GL_TEXTURE_2D, 0, 0, 0, 0,
window_pixmap.texture_width, window_pixmap.texture_height, 1);
int err = glGetError();
if(err != 0) {
static bool error_shown = false;
if(!error_shown) {
error_shown = true;
fprintf(stderr, "Error: glCopyImageSubData failed, gl error: %d\n", err);
}
}
glfwSwapBuffers(window);
// int err = glGetError();
// fprintf(stderr, "error: %d\n", err);
@ -1380,10 +1382,9 @@ int main(int argc, char **argv) {
// res = cuCtxPopCurrent(&old_ctx);
}
frame->pts = frame_count;
frame_count += 1;
frame->pts = (clock_get_monotonic_seconds() - start_time_pts) * AV_TIME_BASE;
if (avcodec_send_frame(video_codec_context, frame) >= 0) {
receive_frames(video_codec_context, VIDEO_STREAM_INDEX, video_stream, av_format_context,
receive_frames(video_codec_context, VIDEO_STREAM_INDEX, video_stream, frame, av_format_context,
record_start_time, frame_data_queue, replay_buffer_size_secs, frames_erased, write_output_mutex);
} else {
fprintf(stderr, "Error: avcodec_send_frame failed\n");