gstreamer/gstajasrcdemux.cpp

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2021-02-08 18:31:22 +00:00
/* GStreamer
* Copyright (C) 2021 Sebastian Dröge <sebastian@centricular.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 <gst/audio/audio.h>
#include "gstajacommon.h"
#include "gstajasrcdemux.h"
GST_DEBUG_CATEGORY_STATIC(gst_aja_src_demux_debug);
#define GST_CAT_DEFAULT gst_aja_src_demux_debug
static GstStaticPadTemplate video_src_template = GST_STATIC_PAD_TEMPLATE(
"video", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS("video/x-raw"));
static GstStaticPadTemplate audio_src_template = GST_STATIC_PAD_TEMPLATE(
"audio", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS("audio/x-raw"));
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE(
"sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS("video/x-raw"));
static GstFlowReturn gst_aja_src_demux_sink_chain(GstPad *pad,
GstObject *parent,
GstBuffer *buffer);
static gboolean gst_aja_src_demux_sink_event(GstPad *pad, GstObject *parent,
GstEvent *event);
#define parent_class gst_aja_src_demux_parent_class
G_DEFINE_TYPE(GstAjaSrcDemux, gst_aja_src_demux, GST_TYPE_ELEMENT);
static void gst_aja_src_demux_class_init(GstAjaSrcDemuxClass *klass) {
GstElementClass *element_class = GST_ELEMENT_CLASS(klass);
gst_element_class_add_static_pad_template(element_class, &sink_template);
gst_element_class_add_static_pad_template(element_class, &video_src_template);
gst_element_class_add_static_pad_template(element_class, &audio_src_template);
gst_element_class_set_static_metadata(
element_class, "AJA audio/video source demuxer", "Audio/Video/Demux",
"Demuxes audio/video from video buffers",
"Sebastian Dröge <sebastian@centricular.com>");
GST_DEBUG_CATEGORY_INIT(gst_aja_src_demux_debug, "ajasrcdemux", 0,
"AJA source demuxer");
}
static void gst_aja_src_demux_init(GstAjaSrcDemux *self) {
self->sink = gst_pad_new_from_static_template(&sink_template, "sink");
gst_pad_set_chain_function(self->sink,
GST_DEBUG_FUNCPTR(gst_aja_src_demux_sink_chain));
gst_pad_set_event_function(self->sink,
GST_DEBUG_FUNCPTR(gst_aja_src_demux_sink_event));
gst_element_add_pad(GST_ELEMENT(self), self->sink);
self->audio_src =
gst_pad_new_from_static_template(&audio_src_template, "audio");
gst_pad_use_fixed_caps(self->audio_src);
gst_element_add_pad(GST_ELEMENT(self), self->audio_src);
self->video_src =
gst_pad_new_from_static_template(&video_src_template, "video");
gst_pad_use_fixed_caps(self->video_src);
gst_element_add_pad(GST_ELEMENT(self), self->video_src);
}
static GstFlowReturn gst_aja_src_demux_sink_chain(GstPad *pad,
GstObject *parent,
GstBuffer *buffer) {
GstAjaSrcDemux *self = GST_AJA_SRC_DEMUX(parent);
GstAjaAudioMeta *meta = gst_buffer_get_aja_audio_meta(buffer);
GstFlowReturn audio_flow_ret = GST_FLOW_OK;
GstFlowReturn video_flow_ret = GST_FLOW_OK;
if (meta) {
GstBuffer *audio_buffer;
buffer = gst_buffer_make_writable(buffer);
meta = gst_buffer_get_aja_audio_meta(buffer);
audio_buffer = gst_buffer_ref(meta->buffer);
gst_buffer_remove_meta(buffer, GST_META_CAST(meta));
audio_flow_ret = gst_pad_push(self->audio_src, audio_buffer);
} else {
GstEvent *event =
gst_event_new_gap(GST_BUFFER_PTS(buffer), GST_BUFFER_DURATION(buffer));
gst_pad_push_event(self->audio_src, event);
}
video_flow_ret = gst_pad_push(self->video_src, buffer);
// Combine flows the way it makes sense
if (video_flow_ret == GST_FLOW_NOT_LINKED &&
audio_flow_ret == GST_FLOW_NOT_LINKED)
return GST_FLOW_NOT_LINKED;
if (video_flow_ret == GST_FLOW_EOS && audio_flow_ret == GST_FLOW_EOS)
return GST_FLOW_EOS;
if (video_flow_ret == GST_FLOW_FLUSHING ||
video_flow_ret <= GST_FLOW_NOT_NEGOTIATED)
return video_flow_ret;
if (audio_flow_ret == GST_FLOW_FLUSHING ||
audio_flow_ret <= GST_FLOW_NOT_NEGOTIATED)
return audio_flow_ret;
return GST_FLOW_OK;
}
static gboolean gst_aja_src_demux_sink_event(GstPad *pad, GstObject *parent,
GstEvent *event) {
GstAjaSrcDemux *self = GST_AJA_SRC_DEMUX(parent);
switch (GST_EVENT_TYPE(event)) {
case GST_EVENT_CAPS: {
GstCaps *caps;
GstStructure *s;
GstAudioInfo audio_info;
gint audio_channels = 0;
gst_event_parse_caps(event, &caps);
s = gst_caps_get_structure(caps, 0);
gst_structure_get_int(s, "audio-channels", &audio_channels);
GstCaps *audio_caps, *video_caps;
gst_audio_info_init(&audio_info);
gst_audio_info_set_format(&audio_info, GST_AUDIO_FORMAT_S32LE, 48000,
audio_channels ? audio_channels : 1, NULL);
audio_caps = gst_audio_info_to_caps(&audio_info);
gst_pad_set_caps(self->audio_src, audio_caps);
gst_caps_unref(audio_caps);
video_caps = gst_caps_ref(caps);
gst_event_unref(event);
video_caps = gst_caps_make_writable(video_caps);
s = gst_caps_get_structure(video_caps, 0);
gst_structure_remove_field(s, "audio-channels");
gst_pad_set_caps(self->video_src, video_caps);
gst_caps_unref(video_caps);
return TRUE;
}
default:
return gst_pad_event_default(pad, parent, event);
}
}