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ajasrc: Fix handling of timestamps and don't rely on driver frame counters

Browse source 
The driver frame counters (processed, dropped, buffer level) are not
always correct apparently, and don't allow reliably assigning a frame
number to captured frames.

Instead of relying on them, count the number of frames directly here and
detect dropped frames based on the capture times of the frames: if more
than 1.75 frame durations are between two frames, then there must've
been a dropped frame.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7163>
This commit is contained in:
Sebastian Dröge 2024-07-11 17:23:43 +03:00 committed by GStreamer Marge Bot
parent 89096dde38
commit 3eec4703c6
1 changed files with 114 additions and 93 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

207
subprojects/gst-plugins-bad/sys/aja/gstajasrc.cpp
View file

@ -28,17 +28,22 @@
*
* ```sh
* gst-launch-1.0 ajasrc video-format=1080p-3000 ! ajasrcdemux name=d \
* d.video ! queue max-size-bytes=0 max-size-buffers=0 max-size-time=1000000000 ! videoconvert ! autovideosink \
* d.audio ! queue max-size-bytes=0 max-size-buffers=0 max-size-time=1000000000 ! audioconvert ! audioresample ! autoaudiosink
* d.video ! queue max-size-bytes=0 max-size-buffers=0
* max-size-time=1000000000 ! videoconvert ! autovideosink \ d.audio ! queue
* max-size-bytes=0 max-size-buffers=0 max-size-time=1000000000 ! audioconvert !
* audioresample ! autoaudiosink
* ```
*
* Capture 1080p30 audio/video and directly output it again on the same card
*
* ```sh
* gst-launch-1.0 ajasrc video-format=1080p-3000 channel=1 input-source=sdi-1 audio-system=2 ! ajasrcdemux name=d \
* d.video ! queue max-size-bytes=0 max-size-buffers=0 max-size-time=1000000000 ! c.video \
* d.audio ! queue max-size-bytes=0 max-size-buffers=0 max-size-time=1000000000 ! c.audio \
* ajasinkcombiner name=c ! ajasink channel=0 reference-source=input-1
* gst-launch-1.0 ajasrc video-format=1080p-3000 channel=1 input-source=sdi-1
* audio-system=2 ! ajasrcdemux name=d \
* d.video ! queue max-size-bytes=0 max-size-buffers=0
* max-size-time=1000000000 ! c.video \
* d.audio ! queue max-size-bytes=0 max-size-buffers=0
* max-size-time=1000000000 ! c.audio \ ajasinkcombiner name=c ! ajasink
* channel=0 reference-source=input-1
* ```
*
* Since: 1.24
@ -2283,7 +2288,7 @@ next_item:
g_free(__dbg); \
__msg = gst_message_new_error(GST_OBJECT(el), __err, __fmt_dbg); \
QueueItem item = {.type = QUEUE_ITEM_TYPE_ERROR, .error{.msg = __msg}}; \
gst_vec_deque_push_tail_struct(el->queue, &item); \
gst_vec_deque_push_tail_struct(el->queue, &item); \
g_cond_signal(&el->queue_cond); \
} \
G_STMT_END;
@ -2293,9 +2298,6 @@ static void capture_thread_func(AJAThread *thread, void *data) {
GstClock *clock = NULL;
GstClock *real_time_clock;
AUTOCIRCULATE_TRANSFER transfer;
guint64 frames_dropped_last = G_MAXUINT64;
gboolean have_signal = TRUE, discont = TRUE;
guint iterations_without_frame = 0;
NTV2VideoFormat last_detected_video_format = ::NTV2_FORMAT_UNKNOWN;
if (self->capture_cpu_core != G_MAXUINT) {
@ -2317,12 +2319,29 @@ static void capture_thread_func(AJAThread *thread, void *data) {
real_time_clock = GST_CLOCK(g_object_new(GST_TYPE_SYSTEM_CLOCK, "clock-type",
GST_CLOCK_TYPE_REALTIME, NULL));
// if we currently have signal
bool have_signal = true;
// if the *next* output frame should have the discont flag set
bool discont = true;
// if the pipeline clock is the monotonic system clock
bool clock_is_monotonic_system_clock = false;
// if the next frame is the first one after autocirculate was started
bool first_frame_after_start = true;
bool reset_clock = false;
GstClockTime first_frame_time = 0;
guint64 first_frame_processed_plus_dropped_minus_buffered = 0;
// acFrameTime of the last captured frame. Used to detect
// if a frame is actually missing or the signal changed
GstClockTime last_frame_time = GST_CLOCK_TIME_NONE;
// Base time of the first frame after a clock observation reset
// Internal frame time is calculated from this and the number of frames
// captured so far.
GstClockTime first_frame_time = GST_CLOCK_TIME_NONE;
guint64 num_frames = 0;
// Number of frames to drop. After signal loss the first few frames
// often have invalid acFrameTime so we drop them to calculate valid
// timestamps afterwards
guint frames_to_drop = 0;
// Number of vsync iterations without a captured frame. If this becomes too
// high we assume signal loss.
guint iterations_without_frame = 0;
g_mutex_lock(&self->queue_lock);
restart:
@ -2352,12 +2371,19 @@ restart:
gst_clear_object(&system_clock);
}
// Reset all local state after restart
have_signal = true;
discont = true;
first_frame_after_start = true;
first_frame_time = 0;
frames_dropped_last = G_MAXUINT64;
have_signal = TRUE;
last_frame_time = GST_CLOCK_TIME_NONE;
first_frame_time = GST_CLOCK_TIME_NONE;
num_frames = 0;
frames_to_drop = 0;
iterations_without_frame = 0;
g_mutex_lock(&self->queue_lock);
self->video_format = ::NTV2_FORMAT_UNKNOWN;
while (self->playing && !self->shutdown) {
// If we don't have a video format configured, configure the device now
// and potentially auto-detect the video format
@ -2381,7 +2407,6 @@ restart:
if (self->video_format == ::NTV2_FORMAT_UNKNOWN) {
GST_DEBUG_OBJECT(self, "No signal, waiting");
frames_dropped_last = G_MAXUINT64;
if (have_signal) {
QueueItem item = {
.type = QUEUE_ITEM_TYPE_SIGNAL_CHANGE,
@ -2390,8 +2415,7 @@ restart:
.vpid = 0}};
gst_vec_deque_push_tail_struct(self->queue, &item);
g_cond_signal(&self->queue_cond);
have_signal = FALSE;
discont = TRUE;
have_signal = false;
}
self->device->device->WaitForInputVerticalInterrupt(self->channel);
continue;
@ -2505,7 +2529,6 @@ restart:
GST_DEBUG_OBJECT(self, "No signal, waiting");
g_mutex_unlock(&self->queue_lock);
frames_dropped_last = G_MAXUINT64;
if (have_signal || current_video_format != last_detected_video_format) {
QueueItem item = {
.type = QUEUE_ITEM_TYPE_SIGNAL_CHANGE,
@ -2515,8 +2538,7 @@ restart:
last_detected_video_format = ::NTV2_FORMAT_UNKNOWN;
gst_vec_deque_push_tail_struct(self->queue, &item);
g_cond_signal(&self->queue_cond);
have_signal = FALSE;
discont = TRUE;
have_signal = false;
}
self->device->device->WaitForInputVerticalInterrupt(self->channel);
g_mutex_lock(&self->queue_lock);
@ -2542,7 +2564,6 @@ restart:
current_string.c_str(), configured_string.c_str(),
effective_string.c_str());
g_mutex_unlock(&self->queue_lock);
frames_dropped_last = G_MAXUINT64;
if (have_signal || current_video_format != last_detected_video_format) {
QueueItem item = {
.type = QUEUE_ITEM_TYPE_SIGNAL_CHANGE,
@ -2552,8 +2573,7 @@ restart:
last_detected_video_format = current_video_format;
gst_vec_deque_push_tail_struct(self->queue, &item);
g_cond_signal(&self->queue_cond);
have_signal = FALSE;
discont = TRUE;
have_signal = false;
}
self->device->device->WaitForInputVerticalInterrupt(self->channel);
g_mutex_lock(&self->queue_lock);
@ -2592,7 +2612,7 @@ restart:
GST_TIME_ARGS(status.acRDTSCCurrentTime * 100),
status.acFramesProcessed, status.acFramesDropped, status.acBufferLevel);
if (status.IsRunning() && status.acBufferLevel > 1) {
if (status.IsRunning() && status.HasAvailableInputFrame()) {
GstBuffer *video_buffer = NULL;
GstBuffer *audio_buffer = NULL;
GstBuffer *anc_buffer = NULL, *anc_buffer2 = NULL;
@ -2610,8 +2630,8 @@ restart:
.vpid = vpid_a}};
gst_vec_deque_push_tail_struct(self->queue, &item);
g_cond_signal(&self->queue_cond);
have_signal = TRUE;
reset_clock = true;
have_signal = true;
last_frame_time = GST_CLOCK_TIME_NONE;
// Drop the next frames after signal recovery as the capture times
// are generally just wrong.
@ -2699,16 +2719,6 @@ restart:
continue;
}
if (frames_to_drop > 0) {
GST_TRACE_OBJECT(self, "Dropping frame");
frames_to_drop -= 1;
gst_clear_buffer(&anc_buffer2);
gst_clear_buffer(&anc_buffer);
gst_clear_buffer(&audio_buffer);
gst_clear_buffer(&video_buffer);
continue;
}
const AUTOCIRCULATE_TRANSFER_STATUS &transfer_status =
transfer.GetTransferStatus();
const FRAME_STAMP &frame_stamp = transfer_status.GetFrameStamp();
@ -2735,6 +2745,16 @@ restart:
transfer_status.acFramesDropped,
transfer_status.acBufferLevel);
if (frames_to_drop > 0) {
GST_TRACE_OBJECT(self, "Dropping frame");
frames_to_drop -= 1;
gst_clear_buffer(&anc_buffer2);
gst_clear_buffer(&anc_buffer);
gst_clear_buffer(&audio_buffer);
gst_clear_buffer(&video_buffer);
continue;
}
GstClockTime frame_time_real = frame_stamp.acFrameTime * 100;
// Convert capture time from real-time clock to monotonic clock by
@ -2758,19 +2778,55 @@ restart:
frame_time_monotonic = frame_time_real + diff;
}
// Detect frame drop: backwards capture time is clearly a problem,
// otherwise consider a frame being dropped if more than 1.75 frame
// durations are between two frames
if (last_frame_time != GST_CLOCK_TIME_NONE) {
GstClockTime frame_drop_threshold =
(7 * self->configured_info.fps_d * GST_SECOND) /
(4 * self->configured_info.fps_n);
if (last_frame_time >= frame_time_monotonic) {
GST_ERROR_OBJECT(self, "Frame capture time went backwards");
last_frame_time = GST_CLOCK_TIME_NONE;
} else if (frame_time_monotonic - last_frame_time >
frame_drop_threshold) {
GstClockTime timestamp =
last_frame_time + self->configured_info.fps_d * GST_SECOND /
self->configured_info.fps_n;
GstClockTime timestamp_end = frame_time_monotonic;
GST_WARNING_OBJECT(self,
"Frame drop of %" GST_TIME_FORMAT " detected",
GST_TIME_ARGS(timestamp_end - timestamp));
QueueItem item = {.type = QUEUE_ITEM_TYPE_FRAMES_DROPPED,
.frames_dropped = {.driver_side = TRUE,
.timestamp_start = timestamp,
.timestamp_end = timestamp_end}};
gst_vec_deque_push_tail_struct(self->queue, &item);
g_cond_signal(&self->queue_cond);
last_frame_time = GST_CLOCK_TIME_NONE;
} else {
GST_TRACE_OBJECT(
self, "Time since last frame: %" GST_TIME_FORMAT,
GST_TIME_ARGS(frame_time_monotonic - last_frame_time));
}
}
GstClockTime frame_src_time;
// Update clock mapping
if (first_frame_after_start || reset_clock) {
if (first_frame_after_start || last_frame_time == GST_CLOCK_TIME_NONE) {
GstClockTime internal, external;
guint64 num, denom;
// Keep observations if there was only temporary signal loss or a
// format change as the source is either using the same clock as
// before, or it's different but then our previous configuration would
// be as good/bad as the local monotonic system clock and over some
// frames we would converge to the new clock.
if (!first_frame_after_start) {
// Keep observations if there was only temporary signal loss as the
// source is either using the same clock as before, or it's different
// but then our previous configuration would be as good/bad as the
// local monotonic system clock and over some frames we would converge
// to the new clock.
if (first_frame_after_start) {
// FIXME: Workaround to get rid of all previous observations
g_object_set(self->clock, "window-size", 32, NULL);
}
@ -2787,36 +2843,30 @@ restart:
&denom);
first_frame_time = frame_src_time = gst_clock_adjust_with_calibration(
NULL, frame_time_monotonic, internal, external, num, denom);
first_frame_processed_plus_dropped_minus_buffered =
transfer_status.acFramesProcessed +
transfer_status.acFramesDropped - transfer_status.acBufferLevel;
GST_TRACE_OBJECT(
self,
"Initializing clock with first frame time %" GST_TIME_FORMAT
" and initial frame count %" G_GUINT64_FORMAT,
GST_TIME_ARGS(first_frame_time),
first_frame_processed_plus_dropped_minus_buffered);
self, "Initializing clock with first frame time %" GST_TIME_FORMAT,
GST_TIME_ARGS(first_frame_time));
first_frame_after_start = false;
reset_clock = false;
discont = TRUE;
num_frames = 0;
} else {
gdouble r_squared;
frame_src_time =
first_frame_time +
gst_util_uint64_scale_ceil(
transfer_status.acFramesProcessed +
transfer_status.acFramesDropped -
transfer_status.acBufferLevel -
first_frame_processed_plus_dropped_minus_buffered,
self->configured_info.fps_d * GST_SECOND,
self->configured_info.fps_n);
gst_util_uint64_scale_ceil(num_frames,
self->configured_info.fps_d * GST_SECOND,
self->configured_info.fps_n);
gst_clock_add_observation(self->clock, frame_time_monotonic,
frame_src_time, &r_squared);
}
last_frame_time = frame_time_monotonic;
num_frames += 1;
GstClockTime capture_time;
if (self->clock == clock) {
// If the pipeline is using our clock then we can directly use the
@ -2881,33 +2931,6 @@ restart:
GST_BUFFER_DURATION(audio_buffer) = gst_util_uint64_scale(
GST_SECOND, self->configured_info.fps_d, self->configured_info.fps_n);
if (frames_dropped_last == G_MAXUINT64) {
frames_dropped_last = transfer_status.acFramesDropped;
} else if (frames_dropped_last < transfer_status.acFramesDropped) {
GST_WARNING_OBJECT(
self, "Dropped %" G_GUINT64_FORMAT " frames",
transfer_status.acFramesDropped - frames_dropped_last);
GstClockTime timestamp = gst_util_uint64_scale(
transfer_status.acFramesProcessed + frames_dropped_last,
self->configured_info.fps_n,
self->configured_info.fps_d * GST_SECOND);
GstClockTime timestamp_end = gst_util_uint64_scale(
transfer_status.acFramesProcessed + transfer_status.acFramesDropped,
self->configured_info.fps_n,
self->configured_info.fps_d * GST_SECOND);
QueueItem item = {.type = QUEUE_ITEM_TYPE_FRAMES_DROPPED,
.frames_dropped = {.driver_side = TRUE,
.timestamp_start = timestamp,
.timestamp_end = timestamp_end}};
gst_vec_deque_push_tail_struct(self->queue, &item);
g_cond_signal(&self->queue_cond);
frames_dropped_last = transfer_status.acFramesDropped;
discont = TRUE;
}
gst_buffer_set_size(audio_buffer, transfer.GetCapturedAudioByteCount());
if (anc_buffer)
gst_buffer_set_size(anc_buffer,
@ -2964,7 +2987,7 @@ restart:
gst_vec_deque_drop_struct(self->queue, i, NULL);
gst_vec_deque_push_tail_struct(self->queue, &item);
self->queue_num_frames -= 1;
discont = TRUE;
discont = true;
g_cond_signal(&self->queue_cond);
break;
}
@ -2974,7 +2997,7 @@ restart:
if (discont) {
GST_BUFFER_FLAG_SET(video_buffer, GST_BUFFER_FLAG_DISCONT);
GST_BUFFER_FLAG_SET(audio_buffer, GST_BUFFER_FLAG_DISCONT);
discont = FALSE;
discont = false;
}
QueueItem item = {
@ -3006,7 +3029,6 @@ restart:
if (have_signal && iterations_without_frame < 32) {
iterations_without_frame++;
} else {
frames_dropped_last = G_MAXUINT64;
if (have_signal || last_detected_video_format != current_video_format) {
QueueItem item = {
.type = QUEUE_ITEM_TYPE_SIGNAL_CHANGE,
@ -3016,8 +3038,7 @@ restart:
last_detected_video_format = current_video_format;
gst_vec_deque_push_tail_struct(self->queue, &item);
g_cond_signal(&self->queue_cond);
have_signal = FALSE;
discont = TRUE;
have_signal = false;
}
}