mirror of
https://github.com/outbackdingo/UltraGrid.git
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17f50eede2
Send same RTP timestamps for audio/video frames captured at the same time. RTP specification allows this (although doesn't require - according to the spec, the RTP timestamps should colaesce with RTCP NTP correspondence). We slightly modify that in a way that we use for both audio and video 90 kHz clock resolution, so if the start point is the same (random), the RTP timestamps will be exactly the same for related data. Implemented for vidcap DeckLink and testcard.
89 lines
3.2 KiB
C
89 lines
3.2 KiB
C
/**
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* @file capture_filter.h
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* @author Martin Pulec <martin.pulec@cesnet.cz>
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*/
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/*
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* Copyright (c) 2013-2023 CESNET, z. s. p. o.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, is permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of CESNET nor the names of its contributors may be
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* used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef CAPTURE_FILTER_H_
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#define CAPTURE_FILTER_H_
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#define CAPTURE_FILTER_ABI_VERSION 3
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct module;
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struct capture_filter_info {
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/// @brief Initializes capture filter
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/// @param parent parent module
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/// @param cfg configuration string from cmdline, not-NULL
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/// @param[out] state output state
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/// @retval 0 if initialized successfully
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/// @retval <0 if error
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/// @retval >0 no error but state was not returned, eg. showing help
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int (*init)(struct module *parent, const char *cfg, void **state);
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void (*done)(void *state);
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/// @brief Performs filtering
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/// @param f input frame
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/// @note
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/// Frame management note
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/// When input frame is no longer used (eg. returned new output frame),
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/// VIDEO_FRAME_DISPOSE(f) has to be called. Also, if you create
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/// new output frame, you may use its .dispose and .dispose_udata
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/// member to manage video_frame lifetime.
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/// This behavior may change towards use of shared_ptr<video_frame>
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/// in future.
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struct video_frame *(*filter)(void *state, struct video_frame *f);
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};
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struct capture_filter;
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struct module;
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struct video_frame;
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/**
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* @see display_init
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*/
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int capture_filter_init(struct module *parent, const char *cfg, struct capture_filter **state);
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void capture_filter_destroy(struct capture_filter *state);
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struct video_frame *capture_filter(struct capture_filter *state, struct video_frame *frame);
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#ifdef __cplusplus
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}
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#endif
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#endif /* CAPTURE_FILTER_H_ */
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