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396aa55958
Provide a clock from the source that is a monotonic system clock with the rate corrected based on the measured and ideal capture rate of the frames. If this clock is selected as pipeline clock, then provide perfect timestamps to downstream. Otherwise, if the pipeline clock is the monotonic system clock, use the internal clock for converting back to the monotonic system clock. Otherwise, use the monotonic system clock time calculated in the above case and convert that to the pipeline clock. In all cases this will give a smoother time than the previous code, which simply took the difference between the driver provided capture time and the current real-time clock time, and applied that to the current pipeline clock time. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6208>
106 lines
3 KiB
C
106 lines
3 KiB
C
/* GStreamer
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* Copyright (C) 2021 Sebastian Dröge <sebastian@centricular.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#pragma once
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#include <gst/base/base.h>
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#include <gst/gst.h>
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#include <gst/video/video.h>
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#include "gstajacommon.h"
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G_BEGIN_DECLS
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#define GST_TYPE_AJA_SRC (gst_aja_src_get_type())
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#define GST_AJA_SRC(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj), GST_TYPE_AJA_SRC, GstAjaSrc))
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#define GST_AJA_SRC_CAST(obj) ((GstAjaSrc *)obj)
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#define GST_AJA_SRC_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass), GST_TYPE_AJA_SRC, GstAjaSrcClass))
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#define GST_IS_AJA_SRC(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj), GST_TYPE_AJA_SRC))
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#define GST_IS_AJA_SRC_CLASS(obj) \
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(G_TYPE_CHECK_CLASS_TYPE((klass), GST_TYPE_AJA_SRC))
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typedef struct _GstAjaSrc GstAjaSrc;
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typedef struct _GstAjaSrcClass GstAjaSrcClass;
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struct _GstAjaSrc {
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GstPushSrc parent;
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// Everything below protected by queue lock
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GMutex queue_lock;
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GCond queue_cond;
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GstQueueArray *queue;
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guint queue_num_frames;
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gboolean playing;
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gboolean shutdown;
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gboolean flushing;
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GstAjaNtv2Device *device;
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NTV2DeviceID device_id;
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GstAllocator *allocator;
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GstBufferPool *buffer_pool;
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GstBufferPool *audio_buffer_pool;
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GstBufferPool *anc_buffer_pool;
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GstClock *clock;
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// Properties
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gchar *device_identifier;
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NTV2Channel channel;
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GstAjaAudioSystem audio_system_setting;
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GstAjaVideoFormat video_format_setting;
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GstAjaSdiMode sdi_mode;
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GstAjaInputSource input_source;
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GstAjaAudioSource audio_source;
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GstAjaEmbeddedAudioInput embedded_audio_input;
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GstAjaTimecodeIndex timecode_index;
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gboolean rp188;
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GstAjaReferenceSource reference_source;
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GstAjaClosedCaptionCaptureMode closed_caption_capture_mode;
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guint queue_size;
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guint start_frame, end_frame;
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guint capture_cpu_core;
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gboolean signal;
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gboolean attach_ancillary_meta;
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NTV2AudioSystem audio_system;
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NTV2VideoFormat video_format;
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bool quad_mode;
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NTV2VANCMode vanc_mode;
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NTV2InputSource configured_input_source;
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GstVideoInfo configured_info; // Based on properties
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GstVideoInfo current_info; // Based on properties + stream metadata
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gint configured_audio_channels;
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AJAThread *capture_thread;
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};
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struct _GstAjaSrcClass {
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GstPushSrcClass parent_class;
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};
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G_GNUC_INTERNAL
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GType gst_aja_src_get_type(void);
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G_END_DECLS
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