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gstreamer/sys/decklink/gstdecklinkvideosrc.cpp
Vivia Nikolaidou a3a7d2e0ff decklink: Detect gaps on incoming stream times, issue warnings 
When we receive a video or audio buffer, we calculate the next stream
time based on the current stream time + buffer duration. If the next
buffer's stream time is after that, we issue a warning.

This happens because the stream time incoming from Decklink should be
really constant and without gaps. If there is a gap, it means that
something went wrong, e.g. the internal buffer pool is empty (too many
buffers queued up downstream).

https://bugzilla.gnome.org/show_bug.cgi?id=781776
2018-01-04 15:43:17 +02:00

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/* GStreamer
* Copyright (C) 2011 David Schleef <ds@entropywave.com>
* Copyright (C) 2014 Sebastian Dröge <sebastian@centricular.com>
* Copyright (C) 2015 Florian Langlois <florian.langlois@fr.thalesgroup.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Suite 500,
* Boston, MA 02110-1335, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstdecklinkvideosrc.h"
#include <string.h>
GST_DEBUG_CATEGORY_STATIC (gst_decklink_video_src_debug);
#define GST_CAT_DEFAULT gst_decklink_video_src_debug
#define DEFAULT_MODE (GST_DECKLINK_MODE_AUTO)
#define DEFAULT_CONNECTION (GST_DECKLINK_CONNECTION_AUTO)
#define DEFAULT_BUFFER_SIZE (5)
#define DEFAULT_OUTPUT_STREAM_TIME (FALSE)
#define DEFAULT_SKIP_FIRST_TIME (0)
#define DEFAULT_DROP_NO_SIGNAL_FRAMES (FALSE)
#ifndef ABSDIFF
#define ABSDIFF(x, y) ( (x) > (y) ? ((x) - (y)) : ((y) - (x)) )
#endif
enum
{
PROP_0,
PROP_MODE,
PROP_CONNECTION,
PROP_DEVICE_NUMBER,
PROP_BUFFER_SIZE,
PROP_VIDEO_FORMAT,
PROP_TIMECODE_FORMAT,
PROP_OUTPUT_STREAM_TIME,
PROP_SKIP_FIRST_TIME,
PROP_DROP_NO_SIGNAL_FRAMES,
PROP_SIGNAL,
PROP_HW_SERIAL_NUMBER
};
typedef struct
{
IDeckLinkVideoInputFrame *frame;
GstClockTime timestamp, duration;
GstClockTime stream_timestamp;
GstClockTime stream_duration;
GstClockTime hardware_timestamp;
GstClockTime hardware_duration;
GstDecklinkModeEnum mode;
BMDPixelFormat format;
GstVideoTimeCode *tc;
gboolean no_signal;
} CaptureFrame;
static void
capture_frame_clear (CaptureFrame * frame)
{
frame->frame->Release ();
if (frame->tc)
gst_video_time_code_free (frame->tc);
memset (frame, 0, sizeof (*frame));
}
typedef struct
{
IDeckLinkVideoInputFrame *frame;
IDeckLinkInput *input;
} VideoFrame;
static void
video_frame_free (void *data)
{
VideoFrame *frame = (VideoFrame *) data;
frame->frame->Release ();
frame->input->Release ();
g_free (frame);
}
static void gst_decklink_video_src_set_property (GObject * object,
guint property_id, const GValue * value, GParamSpec * pspec);
static void gst_decklink_video_src_get_property (GObject * object,
guint property_id, GValue * value, GParamSpec * pspec);
static void gst_decklink_video_src_finalize (GObject * object);
static GstStateChangeReturn
gst_decklink_video_src_change_state (GstElement * element,
GstStateChange transition);
static gboolean gst_decklink_video_src_set_caps (GstBaseSrc * bsrc,
GstCaps * caps);
static GstCaps *gst_decklink_video_src_get_caps (GstBaseSrc * bsrc,
GstCaps * filter);
static gboolean gst_decklink_video_src_query (GstBaseSrc * bsrc,
GstQuery * query);
static gboolean gst_decklink_video_src_unlock (GstBaseSrc * bsrc);
static gboolean gst_decklink_video_src_unlock_stop (GstBaseSrc * bsrc);
static GstFlowReturn gst_decklink_video_src_create (GstPushSrc * psrc,
GstBuffer ** buffer);
static gboolean gst_decklink_video_src_open (GstDecklinkVideoSrc * self);
static gboolean gst_decklink_video_src_close (GstDecklinkVideoSrc * self);
static gboolean gst_decklink_video_src_stop (GstDecklinkVideoSrc * self);
static void gst_decklink_video_src_start_streams (GstElement * element);
#define parent_class gst_decklink_video_src_parent_class
G_DEFINE_TYPE (GstDecklinkVideoSrc, gst_decklink_video_src, GST_TYPE_PUSH_SRC);
static void
gst_decklink_video_src_class_init (GstDecklinkVideoSrcClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstBaseSrcClass *basesrc_class = GST_BASE_SRC_CLASS (klass);
GstPushSrcClass *pushsrc_class = GST_PUSH_SRC_CLASS (klass);
GstCaps *templ_caps;
gobject_class->set_property = gst_decklink_video_src_set_property;
gobject_class->get_property = gst_decklink_video_src_get_property;
gobject_class->finalize = gst_decklink_video_src_finalize;
element_class->change_state =
GST_DEBUG_FUNCPTR (gst_decklink_video_src_change_state);
basesrc_class->get_caps = GST_DEBUG_FUNCPTR (gst_decklink_video_src_get_caps);
basesrc_class->set_caps = GST_DEBUG_FUNCPTR (gst_decklink_video_src_set_caps);
basesrc_class->query = GST_DEBUG_FUNCPTR (gst_decklink_video_src_query);
basesrc_class->unlock = GST_DEBUG_FUNCPTR (gst_decklink_video_src_unlock);
basesrc_class->unlock_stop =
GST_DEBUG_FUNCPTR (gst_decklink_video_src_unlock_stop);
pushsrc_class->create = GST_DEBUG_FUNCPTR (gst_decklink_video_src_create);
g_object_class_install_property (gobject_class, PROP_MODE,
g_param_spec_enum ("mode", "Playback Mode",
"Video Mode to use for playback",
GST_TYPE_DECKLINK_MODE, DEFAULT_MODE,
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
G_PARAM_CONSTRUCT)));
g_object_class_install_property (gobject_class, PROP_CONNECTION,
g_param_spec_enum ("connection", "Connection",
"Video input connection to use",
GST_TYPE_DECKLINK_CONNECTION, DEFAULT_CONNECTION,
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
G_PARAM_CONSTRUCT)));
g_object_class_install_property (gobject_class, PROP_DEVICE_NUMBER,
g_param_spec_int ("device-number", "Device number",
"Output device instance to use", 0, G_MAXINT, 0,
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
G_PARAM_CONSTRUCT)));
g_object_class_install_property (gobject_class, PROP_BUFFER_SIZE,
g_param_spec_uint ("buffer-size", "Buffer Size",
"Size of internal buffer in number of video frames", 1,
G_MAXINT, DEFAULT_BUFFER_SIZE,
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
g_object_class_install_property (gobject_class, PROP_VIDEO_FORMAT,
g_param_spec_enum ("video-format", "Video format",
"Video format type to use for input (Only use auto for mode=auto)",
GST_TYPE_DECKLINK_VIDEO_FORMAT, GST_DECKLINK_VIDEO_FORMAT_AUTO,
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
G_PARAM_CONSTRUCT)));
g_object_class_install_property (gobject_class, PROP_TIMECODE_FORMAT,
g_param_spec_enum ("timecode-format", "Timecode format",
"Timecode format type to use for input",
GST_TYPE_DECKLINK_TIMECODE_FORMAT,
GST_DECKLINK_TIMECODE_FORMAT_RP188ANY,
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
G_PARAM_CONSTRUCT)));
g_object_class_install_property (gobject_class, PROP_OUTPUT_STREAM_TIME,
g_param_spec_boolean ("output-stream-time", "Output Stream Time",
"Output stream time directly instead of translating to pipeline clock",
DEFAULT_OUTPUT_STREAM_TIME,
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
g_object_class_install_property (gobject_class, PROP_SKIP_FIRST_TIME,
g_param_spec_uint64 ("skip-first-time", "Skip First Time",
"Skip that much time of initial frames after starting", 0,
G_MAXUINT64, DEFAULT_SKIP_FIRST_TIME,
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
g_object_class_install_property (gobject_class, PROP_DROP_NO_SIGNAL_FRAMES,
g_param_spec_boolean ("drop-no-signal-frames", "Drop No Signal Frames",
"Drop frames that are marked as having no input signal",
DEFAULT_DROP_NO_SIGNAL_FRAMES,
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
g_object_class_install_property (gobject_class, PROP_SIGNAL,
g_param_spec_boolean ("signal", "Input signal available",
"True if there is a valid input signal available",
FALSE, (GParamFlags) (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
g_object_class_install_property (gobject_class, PROP_HW_SERIAL_NUMBER,
g_param_spec_string ("hw-serial-number", "Hardware serial number",
"The serial number (hardware ID) of the Decklink card",
NULL, (GParamFlags) (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
templ_caps = gst_decklink_mode_get_template_caps (TRUE);
gst_element_class_add_pad_template (element_class,
gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS, templ_caps));
gst_caps_unref (templ_caps);
gst_element_class_set_static_metadata (element_class, "Decklink Video Source",
"Video/Src", "Decklink Source", "David Schleef <ds@entropywave.com>, "
"Sebastian Dröge <sebastian@centricular.com>");
GST_DEBUG_CATEGORY_INIT (gst_decklink_video_src_debug, "decklinkvideosrc",
0, "debug category for decklinkvideosrc element");
}
static void
gst_decklink_video_src_init (GstDecklinkVideoSrc * self)
{
self->mode = DEFAULT_MODE;
self->caps_mode = GST_DECKLINK_MODE_AUTO;
self->caps_format = bmdFormat8BitYUV;
self->connection = DEFAULT_CONNECTION;
self->device_number = 0;
self->buffer_size = DEFAULT_BUFFER_SIZE;
self->video_format = GST_DECKLINK_VIDEO_FORMAT_AUTO;
self->timecode_format = bmdTimecodeRP188Any;
self->no_signal = FALSE;
self->output_stream_time = DEFAULT_OUTPUT_STREAM_TIME;
self->skip_first_time = DEFAULT_SKIP_FIRST_TIME;
self->drop_no_signal_frames = DEFAULT_DROP_NO_SIGNAL_FRAMES;
self->window_size = 64;
self->times = g_new (GstClockTime, 4 * self->window_size);
self->times_temp = self->times + 2 * self->window_size;
self->window_fill = 0;
self->window_skip = 1;
self->window_skip_count = 0;
gst_base_src_set_live (GST_BASE_SRC (self), TRUE);
gst_base_src_set_format (GST_BASE_SRC (self), GST_FORMAT_TIME);
g_mutex_init (&self->lock);
g_cond_init (&self->cond);
self->current_frames =
gst_queue_array_new_for_struct (sizeof (CaptureFrame),
DEFAULT_BUFFER_SIZE);
}
void
gst_decklink_video_src_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec)
{
GstDecklinkVideoSrc *self = GST_DECKLINK_VIDEO_SRC_CAST (object);
switch (property_id) {
case PROP_MODE:
self->mode = (GstDecklinkModeEnum) g_value_get_enum (value);
/* setting the default value for caps_mode here: if mode==auto then we
* configure caps_mode from the caps, if mode!=auto we set caps_mode to
* the same value as the mode. so self->caps_mode is essentially
* self->mode with mode=auto filtered into whatever we got from the
* negotiation */
if (self->mode != GST_DECKLINK_MODE_AUTO)
self->caps_mode = self->mode;
break;
case PROP_CONNECTION:
self->connection = (GstDecklinkConnectionEnum) g_value_get_enum (value);
break;
case PROP_DEVICE_NUMBER:
self->device_number = g_value_get_int (value);
break;
case PROP_BUFFER_SIZE:
self->buffer_size = g_value_get_uint (value);
break;
case PROP_VIDEO_FORMAT:
self->video_format = (GstDecklinkVideoFormat) g_value_get_enum (value);
switch (self->video_format) {
case GST_DECKLINK_VIDEO_FORMAT_8BIT_YUV:
case GST_DECKLINK_VIDEO_FORMAT_10BIT_YUV:
case GST_DECKLINK_VIDEO_FORMAT_8BIT_ARGB:
case GST_DECKLINK_VIDEO_FORMAT_8BIT_BGRA:
self->caps_format =
gst_decklink_pixel_format_from_type (self->video_format);
case GST_DECKLINK_VIDEO_FORMAT_AUTO:
break;
default:
GST_ELEMENT_WARNING (GST_ELEMENT (self), CORE, NOT_IMPLEMENTED,
("Format %d not supported", self->video_format), (NULL));
break;
}
break;
case PROP_TIMECODE_FORMAT:
self->timecode_format =
gst_decklink_timecode_format_from_enum ((GstDecklinkTimecodeFormat)
g_value_get_enum (value));
break;
case PROP_OUTPUT_STREAM_TIME:
self->output_stream_time = g_value_get_boolean (value);
break;
case PROP_SKIP_FIRST_TIME:
self->skip_first_time = g_value_get_uint64 (value);
break;
case PROP_DROP_NO_SIGNAL_FRAMES:
self->drop_no_signal_frames = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
void
gst_decklink_video_src_get_property (GObject * object, guint property_id,
GValue * value, GParamSpec * pspec)
{
GstDecklinkVideoSrc *self = GST_DECKLINK_VIDEO_SRC_CAST (object);
switch (property_id) {
case PROP_MODE:
g_value_set_enum (value, self->mode);
break;
case PROP_CONNECTION:
g_value_set_enum (value, self->connection);
break;
case PROP_DEVICE_NUMBER:
g_value_set_int (value, self->device_number);
break;
case PROP_BUFFER_SIZE:
g_value_set_uint (value, self->buffer_size);
break;
case PROP_VIDEO_FORMAT:
g_value_set_enum (value, self->video_format);
break;
case PROP_TIMECODE_FORMAT:
g_value_set_enum (value,
gst_decklink_timecode_format_to_enum (self->timecode_format));
break;
case PROP_OUTPUT_STREAM_TIME:
g_value_set_boolean (value, self->output_stream_time);
break;
case PROP_SKIP_FIRST_TIME:
g_value_set_uint64 (value, self->skip_first_time);
break;
case PROP_DROP_NO_SIGNAL_FRAMES:
g_value_set_boolean (value, self->drop_no_signal_frames);
break;
case PROP_SIGNAL:
g_value_set_boolean (value, !self->no_signal);
break;
case PROP_HW_SERIAL_NUMBER:
if (self->input)
g_value_set_string (value, self->input->hw_serial_number);
else
g_value_set_string (value, NULL);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
void
gst_decklink_video_src_finalize (GObject * object)
{
GstDecklinkVideoSrc *self = GST_DECKLINK_VIDEO_SRC_CAST (object);
g_free (self->times);
self->times = NULL;
g_mutex_clear (&self->lock);
g_cond_clear (&self->cond);
if (self->current_frames) {
while (gst_queue_array_get_length (self->current_frames) > 0) {
CaptureFrame *tmp = (CaptureFrame *)
gst_queue_array_pop_head_struct (self->current_frames);
capture_frame_clear (tmp);
}
gst_queue_array_free (self->current_frames);
self->current_frames = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_decklink_video_src_set_caps (GstBaseSrc * bsrc, GstCaps * caps)
{
GstDecklinkVideoSrc *self = GST_DECKLINK_VIDEO_SRC_CAST (bsrc);
GstCaps *current_caps;
const GstDecklinkMode *mode;
BMDVideoInputFlags flags;
HRESULT ret;
BMDPixelFormat format;
GST_DEBUG_OBJECT (self, "Setting caps %" GST_PTR_FORMAT, caps);
if ((current_caps = gst_pad_get_current_caps (GST_BASE_SRC_PAD (bsrc)))) {
GST_DEBUG_OBJECT (self, "Pad already has caps %" GST_PTR_FORMAT, caps);
if (!gst_caps_is_equal (caps, current_caps)) {
GST_DEBUG_OBJECT (self, "New caps, reconfiguring");
gst_caps_unref (current_caps);
if (self->mode == GST_DECKLINK_MODE_AUTO) {
return TRUE;
} else {
return FALSE;
}
} else {
gst_caps_unref (current_caps);
return TRUE;
}
}
if (!gst_video_info_from_caps (&self->info, caps))
return FALSE;
if (self->input->config && self->connection != GST_DECKLINK_CONNECTION_AUTO) {
ret = self->input->config->SetInt (bmdDeckLinkConfigVideoInputConnection,
gst_decklink_get_connection (self->connection));
if (ret != S_OK) {
GST_ERROR_OBJECT (self,
"Failed to set configuration (input source): 0x%08lx",
(unsigned long) ret);
return FALSE;
}
if (self->connection == GST_DECKLINK_CONNECTION_COMPOSITE) {
ret = self->input->config->SetInt (bmdDeckLinkConfigAnalogVideoInputFlags,
bmdAnalogVideoFlagCompositeSetup75);
if (ret != S_OK) {
GST_ERROR_OBJECT (self,
"Failed to set configuration (composite setup): 0x%08lx",
(unsigned long) ret);
return FALSE;
}
}
}
flags = bmdVideoInputFlagDefault;
if (self->mode == GST_DECKLINK_MODE_AUTO) {
bool autoDetection = false;
if (self->input->attributes) {
ret =
self->input->
attributes->GetFlag (BMDDeckLinkSupportsInputFormatDetection,
&autoDetection);
if (ret != S_OK) {
GST_ERROR_OBJECT (self,
"Failed to get attribute (autodetection): 0x%08lx",
(unsigned long) ret);
return FALSE;
}
if (autoDetection)
flags |= bmdVideoInputEnableFormatDetection;
}
if (!autoDetection) {
GST_ERROR_OBJECT (self, "Failed to activate auto-detection");
return FALSE;
}
}
mode = gst_decklink_get_mode (self->mode);
g_assert (mode != NULL);
format = self->caps_format;
ret = self->input->input->EnableVideoInput (mode->mode, format, flags);
if (ret != S_OK) {
GST_WARNING_OBJECT (self, "Failed to enable video input: 0x%08lx",
(unsigned long) ret);
return FALSE;
}
g_mutex_lock (&self->input->lock);
self->input->mode = mode;
self->input->video_enabled = TRUE;
if (self->input->start_streams)
self->input->start_streams (self->input->videosrc);
g_mutex_unlock (&self->input->lock);
return TRUE;
}
static GstCaps *
gst_decklink_video_src_get_caps (GstBaseSrc * bsrc, GstCaps * filter)
{
GstDecklinkVideoSrc *self = GST_DECKLINK_VIDEO_SRC_CAST (bsrc);
GstCaps *mode_caps, *caps;
BMDPixelFormat format;
GstDecklinkModeEnum mode;
g_mutex_lock (&self->lock);
mode = self->caps_mode;
format = self->caps_format;
g_mutex_unlock (&self->lock);
mode_caps = gst_decklink_mode_get_caps (mode, format, TRUE);
if (filter) {
caps =
gst_caps_intersect_full (filter, mode_caps, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (mode_caps);
} else {
caps = mode_caps;
}
return caps;
}
static void
gst_decklink_video_src_update_time_mapping (GstDecklinkVideoSrc * self,
GstClockTime capture_time, GstClockTime stream_time)
{
if (self->window_skip_count == 0) {
GstClockTime num, den, b, xbase;
gdouble r_squared;
self->times[2 * self->window_fill] = stream_time;
self->times[2 * self->window_fill + 1] = capture_time;
self->window_fill++;
self->window_skip_count++;
if (self->window_skip_count >= self->window_skip)
self->window_skip_count = 0;
if (self->window_fill >= self->window_size) {
guint fps =
((gdouble) self->info.fps_n + self->info.fps_d -
1) / ((gdouble) self->info.fps_d);
/* Start by updating first every frame, once full every second frame,
* etc. until we update once every 4 seconds */
if (self->window_skip < 4 * fps)
self->window_skip *= 2;
if (self->window_skip >= 4 * fps)
self->window_skip = 4 * fps;
self->window_fill = 0;
self->window_filled = TRUE;
}
/* First sample ever, create some basic mapping to start */
if (!self->window_filled && self->window_fill == 1) {
self->current_time_mapping.xbase = stream_time;
self->current_time_mapping.b = capture_time;
self->current_time_mapping.num = 1;
self->current_time_mapping.den = 1;
self->next_time_mapping_pending = FALSE;
}
/* Only bother calculating anything here once we had enough measurements,
* i.e. let's take the window size as a start */
if (self->window_filled &&
gst_calculate_linear_regression (self->times, self->times_temp,
self->window_size, &num, &den, &b, &xbase, &r_squared)) {
GST_DEBUG_OBJECT (self,
"Calculated new time mapping: pipeline time = %lf * (stream time - %"
G_GUINT64_FORMAT ") + %" G_GUINT64_FORMAT " (%lf)",
((gdouble) num) / ((gdouble) den), xbase, b, r_squared);
self->next_time_mapping.xbase = xbase;
self->next_time_mapping.b = b;
self->next_time_mapping.num = num;
self->next_time_mapping.den = den;
self->next_time_mapping_pending = TRUE;
}
} else {
self->window_skip_count++;
if (self->window_skip_count >= self->window_skip)
self->window_skip_count = 0;
}
if (self->next_time_mapping_pending) {
GstClockTime expected, new_calculated, diff, max_diff;
expected =
gst_clock_adjust_with_calibration (NULL, stream_time,
self->current_time_mapping.xbase, self->current_time_mapping.b,
self->current_time_mapping.num, self->current_time_mapping.den);
new_calculated =
gst_clock_adjust_with_calibration (NULL, stream_time,
self->next_time_mapping.xbase, self->next_time_mapping.b,
self->next_time_mapping.num, self->next_time_mapping.den);
if (new_calculated > expected)
diff = new_calculated - expected;
else
diff = expected - new_calculated;
/* At most 5% frame duration change per update */
max_diff =
gst_util_uint64_scale (GST_SECOND / 20, self->info.fps_d,
self->info.fps_n);
GST_DEBUG_OBJECT (self,
"New time mapping causes difference of %" GST_TIME_FORMAT,
GST_TIME_ARGS (diff));
GST_DEBUG_OBJECT (self, "Maximum allowed per frame %" GST_TIME_FORMAT,
GST_TIME_ARGS (max_diff));
if (diff > max_diff) {
/* adjust so that we move that much closer */
if (new_calculated > expected) {
self->current_time_mapping.b = expected + max_diff;
self->current_time_mapping.xbase = stream_time;
} else {
self->current_time_mapping.b = expected - max_diff;
self->current_time_mapping.xbase = stream_time;
}
} else {
self->current_time_mapping.xbase = self->next_time_mapping.xbase;
self->current_time_mapping.b = self->next_time_mapping.b;
self->current_time_mapping.num = self->next_time_mapping.num;
self->current_time_mapping.den = self->next_time_mapping.den;
self->next_time_mapping_pending = FALSE;
}
}
}
static void
gst_decklink_video_src_got_frame (GstElement * element,
IDeckLinkVideoInputFrame * frame, GstDecklinkModeEnum mode,
GstClockTime capture_time, GstClockTime stream_time,
GstClockTime stream_duration, GstClockTime hardware_time,
GstClockTime hardware_duration, IDeckLinkTimecode * dtc, gboolean no_signal)
{
GstDecklinkVideoSrc *self = GST_DECKLINK_VIDEO_SRC_CAST (element);
GstClockTime timestamp, duration;
GST_LOG_OBJECT (self,
"Got video frame at %" GST_TIME_FORMAT " / %" GST_TIME_FORMAT " (%"
GST_TIME_FORMAT "), no signal: %d", GST_TIME_ARGS (capture_time),
GST_TIME_ARGS (stream_time), GST_TIME_ARGS (stream_duration), no_signal);
if (self->drop_no_signal_frames && no_signal)
return;
g_mutex_lock (&self->lock);
if (self->first_time == GST_CLOCK_TIME_NONE)
self->first_time = stream_time;
if (self->skip_first_time > 0
&& stream_time - self->first_time < self->skip_first_time) {
g_mutex_unlock (&self->lock);
GST_DEBUG_OBJECT (self,
"Skipping frame as requested: %" GST_TIME_FORMAT " < %" GST_TIME_FORMAT,
GST_TIME_ARGS (stream_time),
GST_TIME_ARGS (self->skip_first_time + self->first_time));
return;
}
gst_decklink_video_src_update_time_mapping (self, capture_time, stream_time);
if (self->output_stream_time) {
timestamp = stream_time;
duration = stream_duration;
} else {
timestamp =
gst_clock_adjust_with_calibration (NULL, stream_time,
self->current_time_mapping.xbase, self->current_time_mapping.b,
self->current_time_mapping.num, self->current_time_mapping.den);
duration =
gst_util_uint64_scale (stream_duration, self->current_time_mapping.num,
self->current_time_mapping.den);
}
GST_LOG_OBJECT (self,
"Converted times to %" GST_TIME_FORMAT " (%"
GST_TIME_FORMAT ")", GST_TIME_ARGS (timestamp), GST_TIME_ARGS (duration));
if (!self->flushing) {
CaptureFrame f;
const GstDecklinkMode *bmode;
GstVideoTimeCodeFlags flags = GST_VIDEO_TIME_CODE_FLAGS_NONE;
guint field_count = 0;
guint skipped_frames = 0;
GstClockTime from_timestamp = GST_CLOCK_TIME_NONE;
GstClockTime to_timestamp = GST_CLOCK_TIME_NONE;
while (gst_queue_array_get_length (self->current_frames) >=
self->buffer_size) {
CaptureFrame *tmp = (CaptureFrame *)
gst_queue_array_pop_head_struct (self->current_frames);
if (skipped_frames == 0)
from_timestamp = tmp->timestamp;
skipped_frames++;
to_timestamp = tmp->timestamp;
capture_frame_clear (tmp);
}
if (skipped_frames > 0)
GST_WARNING_OBJECT (self,
"Dropped %u old frames from %" GST_TIME_FORMAT " to %"
GST_TIME_FORMAT, skipped_frames, GST_TIME_ARGS (from_timestamp),
GST_TIME_ARGS (to_timestamp));
memset (&f, 0, sizeof (f));
f.frame = frame;
f.timestamp = timestamp;
f.duration = duration;
f.stream_timestamp = stream_time;
f.stream_duration = stream_duration;
f.hardware_timestamp = hardware_time;
f.hardware_duration = hardware_duration;
f.mode = mode;
f.format = frame->GetPixelFormat ();
f.no_signal = no_signal;
if (dtc != NULL) {
uint8_t hours, minutes, seconds, frames;
HRESULT res;
res = dtc->GetComponents (&hours, &minutes, &seconds, &frames);
if (res != S_OK) {
GST_ERROR ("Could not get components for timecode %p: 0x%08lx", dtc,
(unsigned long) res);
f.tc = NULL;
} else {
GST_DEBUG_OBJECT (self, "Got timecode %02d:%02d:%02d:%02d",
hours, minutes, seconds, frames);
bmode = gst_decklink_get_mode (mode);
if (bmode->interlaced)
flags =
(GstVideoTimeCodeFlags) (flags |
GST_VIDEO_TIME_CODE_FLAGS_INTERLACED);
if (bmode->fps_d == 1001 && (bmode->fps_n == 30000 || bmode->fps_n == 60000))
flags =
(GstVideoTimeCodeFlags) (flags |
GST_VIDEO_TIME_CODE_FLAGS_DROP_FRAME);
f.tc =
gst_video_time_code_new (bmode->fps_n, bmode->fps_d, NULL, flags,
hours, minutes, seconds, frames, field_count);
}
dtc->Release ();
} else {
f.tc = NULL;
}
frame->AddRef ();
gst_queue_array_push_tail_struct (self->current_frames, &f);
g_cond_signal (&self->cond);
}
g_mutex_unlock (&self->lock);
}
static GstFlowReturn
gst_decklink_video_src_create (GstPushSrc * bsrc, GstBuffer ** buffer)
{
GstDecklinkVideoSrc *self = GST_DECKLINK_VIDEO_SRC_CAST (bsrc);
GstFlowReturn flow_ret = GST_FLOW_OK;
const guint8 *data;
gsize data_size;
VideoFrame *vf;
CaptureFrame f;
GstCaps *caps;
gboolean caps_changed = FALSE;
const GstDecklinkMode *mode;
static GstStaticCaps stream_reference =
GST_STATIC_CAPS ("timestamp/x-decklink-stream");
static GstStaticCaps hardware_reference =
GST_STATIC_CAPS ("timestamp/x-decklink-hardware");
g_mutex_lock (&self->lock);
while (gst_queue_array_is_empty (self->current_frames) && !self->flushing) {
g_cond_wait (&self->cond, &self->lock);
}
if (self->flushing) {
GST_DEBUG_OBJECT (self, "Flushing");
g_mutex_unlock (&self->lock);
return GST_FLOW_FLUSHING;
}
f = *(CaptureFrame *) gst_queue_array_pop_head_struct (self->current_frames);
g_mutex_unlock (&self->lock);
// If we're not flushing, we should have a valid frame from the queue
g_assert (f.frame != NULL);
g_mutex_lock (&self->lock);
if (self->caps_mode != f.mode) {
if (self->mode == GST_DECKLINK_MODE_AUTO) {
GST_DEBUG_OBJECT (self, "Mode changed from %d to %d", self->caps_mode,
f.mode);
caps_changed = TRUE;
self->caps_mode = f.mode;
} else {
g_mutex_unlock (&self->lock);
GST_ELEMENT_ERROR (self, CORE, NEGOTIATION,
("Invalid mode in captured frame"),
("Mode set to %d but captured %d", self->caps_mode, f.mode));
capture_frame_clear (&f);
return GST_FLOW_NOT_NEGOTIATED;
}
}
if (self->caps_format != f.format) {
if (self->video_format == GST_DECKLINK_VIDEO_FORMAT_AUTO) {
GST_DEBUG_OBJECT (self, "Format changed from %d to %d", self->caps_format,
f.format);
caps_changed = TRUE;
self->caps_format = f.format;
} else {
g_mutex_unlock (&self->lock);
GST_ELEMENT_ERROR (self, CORE, NEGOTIATION,
("Invalid pixel format in captured frame"),
("Format set to %d but captured %d", self->caps_format, f.format));
capture_frame_clear (&f);
return GST_FLOW_NOT_NEGOTIATED;
}
}
/* 1 ns error can be just a rounding error, so that's OK. The Decklink
* drivers give us a really steady stream time, so anything above 1 ns can't
* be a rounding error and is therefore something to worry about */
if (self->expected_stream_time != GST_CLOCK_TIME_NONE &&
ABSDIFF (self->expected_stream_time, f.stream_timestamp) > 1) {
GstMessage *msg;
GstClockTime running_time;
self->dropped += f.stream_timestamp - self->expected_stream_time;
running_time = gst_segment_to_running_time (&GST_BASE_SRC (self)->segment,
GST_FORMAT_TIME, f.timestamp);
msg = gst_message_new_qos (GST_OBJECT (self), TRUE, running_time, f.stream_timestamp,
f.timestamp, f.duration);
gst_message_set_qos_stats (msg, GST_FORMAT_TIME, self->processed,
self->dropped);
gst_element_post_message (GST_ELEMENT (self), msg);
}
if (self->first_stream_time == GST_CLOCK_TIME_NONE)
self->first_stream_time = f.stream_timestamp;
self->processed = f.stream_timestamp - self->dropped - self->first_stream_time;
self->expected_stream_time = f.stream_timestamp + f.stream_duration;
g_mutex_unlock (&self->lock);
if (caps_changed) {
caps = gst_decklink_mode_get_caps (f.mode, f.format, TRUE);
gst_video_info_from_caps (&self->info, caps);
gst_base_src_set_caps (GST_BASE_SRC_CAST (bsrc), caps);
gst_element_post_message (GST_ELEMENT_CAST (self),
gst_message_new_latency (GST_OBJECT_CAST (self)));
gst_caps_unref (caps);
}
f.frame->GetBytes ((gpointer *) & data);
data_size = self->info.size;
vf = (VideoFrame *) g_malloc0 (sizeof (VideoFrame));
*buffer =
gst_buffer_new_wrapped_full ((GstMemoryFlags) GST_MEMORY_FLAG_READONLY,
(gpointer) data, data_size, 0, data_size, vf,
(GDestroyNotify) video_frame_free);
vf->frame = f.frame;
f.frame->AddRef ();
vf->input = self->input->input;
vf->input->AddRef ();
if (f.no_signal) {
if (!self->no_signal) {
self->no_signal = TRUE;
g_object_notify (G_OBJECT (self), "signal");
GST_ELEMENT_WARNING (GST_ELEMENT (self), RESOURCE, READ, ("No signal"),
("No input source was detected - video frames invalid"));
}
} else {
if (self->no_signal) {
self->no_signal = FALSE;
g_object_notify (G_OBJECT (self), "signal");
GST_ELEMENT_INFO (GST_ELEMENT (self), RESOURCE, READ, ("Signal found"),
("Input source detected"));
}
}
if (f.no_signal)
GST_BUFFER_FLAG_SET (*buffer, GST_BUFFER_FLAG_GAP);
GST_BUFFER_TIMESTAMP (*buffer) = f.timestamp;
GST_BUFFER_DURATION (*buffer) = f.duration;
if (f.tc != NULL)
gst_buffer_add_video_time_code_meta (*buffer, f.tc);
gst_buffer_add_reference_timestamp_meta (*buffer,
gst_static_caps_get (&stream_reference), f.stream_timestamp,
f.stream_duration);
gst_buffer_add_reference_timestamp_meta (*buffer,
gst_static_caps_get (&hardware_reference), f.hardware_timestamp,
f.hardware_duration);
mode = gst_decklink_get_mode (self->mode);
if (mode->interlaced && mode->tff)
GST_BUFFER_FLAG_SET (*buffer,
GST_VIDEO_BUFFER_FLAG_TFF | GST_VIDEO_BUFFER_FLAG_INTERLACED);
GST_DEBUG_OBJECT (self,
"Outputting buffer %p with timestamp %" GST_TIME_FORMAT " and duration %"
GST_TIME_FORMAT, *buffer, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (*buffer)),
GST_TIME_ARGS (GST_BUFFER_DURATION (*buffer)));
capture_frame_clear (&f);
return flow_ret;
}
static gboolean
gst_decklink_video_src_query (GstBaseSrc * bsrc, GstQuery * query)
{
GstDecklinkVideoSrc *self = GST_DECKLINK_VIDEO_SRC_CAST (bsrc);
gboolean ret = TRUE;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_LATENCY:{
if (self->input) {
GstClockTime min, max;
const GstDecklinkMode *mode;
g_mutex_lock (&self->lock);
mode = gst_decklink_get_mode (self->caps_mode);
g_mutex_unlock (&self->lock);
min = gst_util_uint64_scale_ceil (GST_SECOND, mode->fps_d, mode->fps_n);
max = self->buffer_size * min;
gst_query_set_latency (query, TRUE, min, max);
ret = TRUE;
} else {
ret = FALSE;
}
break;
}
default:
ret = GST_BASE_SRC_CLASS (parent_class)->query (bsrc, query);
break;
}
return ret;
}
static gboolean
gst_decklink_video_src_unlock (GstBaseSrc * bsrc)
{
GstDecklinkVideoSrc *self = GST_DECKLINK_VIDEO_SRC_CAST (bsrc);
g_mutex_lock (&self->lock);
self->flushing = TRUE;
g_cond_signal (&self->cond);
g_mutex_unlock (&self->lock);
return TRUE;
}
static gboolean
gst_decklink_video_src_unlock_stop (GstBaseSrc * bsrc)
{
GstDecklinkVideoSrc *self = GST_DECKLINK_VIDEO_SRC_CAST (bsrc);
g_mutex_lock (&self->lock);
self->flushing = FALSE;
while (gst_queue_array_get_length (self->current_frames) > 0) {
CaptureFrame *tmp =
(CaptureFrame *) gst_queue_array_pop_head_struct (self->current_frames);
capture_frame_clear (tmp);
}
g_mutex_unlock (&self->lock);
return TRUE;
}
static gboolean
gst_decklink_video_src_open (GstDecklinkVideoSrc * self)
{
const GstDecklinkMode *mode;
GST_DEBUG_OBJECT (self, "Opening");
self->input =
gst_decklink_acquire_nth_input (self->device_number,
GST_ELEMENT_CAST (self), FALSE);
if (!self->input) {
GST_ERROR_OBJECT (self, "Failed to acquire input");
return FALSE;
}
g_object_notify (G_OBJECT (self), "hw-serial-number");
mode = gst_decklink_get_mode (self->mode);
g_assert (mode != NULL);
g_mutex_lock (&self->input->lock);
self->input->mode = mode;
self->input->got_video_frame = gst_decklink_video_src_got_frame;
self->input->start_streams = gst_decklink_video_src_start_streams;
g_mutex_unlock (&self->input->lock);
return TRUE;
}
static gboolean
gst_decklink_video_src_close (GstDecklinkVideoSrc * self)
{
GST_DEBUG_OBJECT (self, "Closing");
if (self->input) {
g_mutex_lock (&self->input->lock);
self->input->got_video_frame = NULL;
self->input->mode = NULL;
self->input->video_enabled = FALSE;
self->input->start_streams = NULL;
g_mutex_unlock (&self->input->lock);
gst_decklink_release_nth_input (self->device_number,
GST_ELEMENT_CAST (self), FALSE);
self->input = NULL;
}
return TRUE;
}
static gboolean
gst_decklink_video_src_stop (GstDecklinkVideoSrc * self)
{
GST_DEBUG_OBJECT (self, "Stopping");
while (gst_queue_array_get_length (self->current_frames) > 0) {
CaptureFrame *tmp =
(CaptureFrame *) gst_queue_array_pop_head_struct (self->current_frames);
capture_frame_clear (tmp);
}
self->caps_mode = GST_DECKLINK_MODE_AUTO;
if (self->input && self->input->video_enabled) {
g_mutex_lock (&self->input->lock);
self->input->video_enabled = FALSE;
g_mutex_unlock (&self->input->lock);
self->input->input->DisableVideoInput ();
}
return TRUE;
}
static void
gst_decklink_video_src_start_streams (GstElement * element)
{
GstDecklinkVideoSrc *self = GST_DECKLINK_VIDEO_SRC_CAST (element);
HRESULT res;
if (self->input->video_enabled && (!self->input->audiosrc
|| self->input->audio_enabled)
&& (GST_STATE (self) == GST_STATE_PLAYING
|| GST_STATE_PENDING (self) == GST_STATE_PLAYING)) {
GST_DEBUG_OBJECT (self, "Starting streams");
g_mutex_lock (&self->lock);
self->first_time = GST_CLOCK_TIME_NONE;
self->window_fill = 0;
self->window_filled = FALSE;
self->window_skip = 1;
self->window_skip_count = 0;
self->current_time_mapping.xbase = 0;
self->current_time_mapping.b = 0;
self->current_time_mapping.num = 1;
self->current_time_mapping.den = 1;
self->next_time_mapping.xbase = 0;
self->next_time_mapping.b = 0;
self->next_time_mapping.num = 1;
self->next_time_mapping.den = 1;
g_mutex_unlock (&self->lock);
res = self->input->input->StartStreams ();
if (res != S_OK) {
GST_ELEMENT_ERROR (self, STREAM, FAILED,
(NULL), ("Failed to start streams: 0x%08lx", (unsigned long) res));
return;
}
} else {
GST_DEBUG_OBJECT (self, "Not starting streams yet");
}
}
static GstStateChangeReturn
gst_decklink_video_src_change_state (GstElement * element,
GstStateChange transition)
{
GstDecklinkVideoSrc *self = GST_DECKLINK_VIDEO_SRC_CAST (element);
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
self->processed = 0;
self->dropped = 0;
self->expected_stream_time = GST_CLOCK_TIME_NONE;
self->first_stream_time = GST_CLOCK_TIME_NONE;
if (!gst_decklink_video_src_open (self)) {
ret = GST_STATE_CHANGE_FAILURE;
goto out;
}
if (self->mode == GST_DECKLINK_MODE_AUTO &&
self->video_format != GST_DECKLINK_VIDEO_FORMAT_AUTO) {
GST_WARNING_OBJECT (self, "Warning: mode=auto and format!=auto may \
not work");
}
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
self->flushing = FALSE;
break;
default:
break;
}
if (ret == GST_STATE_CHANGE_FAILURE)
return ret;
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (ret == GST_STATE_CHANGE_FAILURE)
return ret;
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
self->no_signal = FALSE;
gst_decklink_video_src_stop (self);
break;
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:{
HRESULT res;
GST_DEBUG_OBJECT (self, "Stopping streams");
res = self->input->input->StopStreams ();
if (res != S_OK) {
GST_ELEMENT_ERROR (self, STREAM, FAILED,
(NULL), ("Failed to stop streams: 0x%08lx", (unsigned long) res));
ret = GST_STATE_CHANGE_FAILURE;
}
break;
}
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:{
g_mutex_lock (&self->input->lock);
if (self->input->start_streams)
self->input->start_streams (self->input->videosrc);
g_mutex_unlock (&self->input->lock);
break;
}
case GST_STATE_CHANGE_READY_TO_NULL:
gst_decklink_video_src_close (self);
break;
default:
break;
}
out:
return ret;
}
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