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225 lines
6.4 KiB
C
225 lines
6.4 KiB
C
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/*
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* GStreamer
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* Copyright (C) 2019 Mathieu Duponchelle <mathieu@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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/**
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* SECTION:element-line21encoder
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* @title: line21encoder
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*
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <gst/gst.h>
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#include <gst/video/video.h>
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#include <string.h>
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#include "gstline21enc.h"
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#include "io-sim.h"
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GST_DEBUG_CATEGORY_STATIC (gst_line_21_encoder_debug);
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#define GST_CAT_DEFAULT gst_line_21_encoder_debug
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#define CAPS "video/x-raw, format={ I420, YUY2, YVYU, UYVY, VYUY }, width=(int)720, height=(int)[ 23, MAX ], interlace-mode=interleaved"
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static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (CAPS));
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static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (CAPS));
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G_DEFINE_TYPE (GstLine21Encoder, gst_line_21_encoder, GST_TYPE_VIDEO_FILTER);
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#define parent_class gst_line_21_encoder_parent_class
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static gboolean gst_line_21_encoder_set_info (GstVideoFilter * filter,
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GstCaps * incaps, GstVideoInfo * in_info,
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GstCaps * outcaps, GstVideoInfo * out_info);
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static GstFlowReturn gst_line_21_encoder_transform_ip (GstVideoFilter * filter,
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GstVideoFrame * frame);
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static void
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gst_line_21_encoder_class_init (GstLine21EncoderClass * klass)
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{
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GstElementClass *gstelement_class;
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GstVideoFilterClass *filter_class;
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gstelement_class = (GstElementClass *) klass;
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filter_class = (GstVideoFilterClass *) klass;
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gst_element_class_set_static_metadata (gstelement_class,
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"Line 21 CC Encoder",
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"Filter/Video/ClosedCaption",
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"Inject line21 CC in SD video streams",
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"Mathieu Duponchelle <mathieu@centricular.com>");
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gst_element_class_add_static_pad_template (gstelement_class, &sinktemplate);
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gst_element_class_add_static_pad_template (gstelement_class, &srctemplate);
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filter_class->set_info = gst_line_21_encoder_set_info;
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filter_class->transform_frame_ip = gst_line_21_encoder_transform_ip;
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GST_DEBUG_CATEGORY_INIT (gst_line_21_encoder_debug, "line21encoder",
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0, "Line 21 CC Encoder");
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vbi_initialize_gst_debug ();
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}
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static void
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gst_line_21_encoder_init (GstLine21Encoder * filter)
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{
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}
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static vbi_pixfmt
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vbi_pixfmt_from_gst_video_format (GstVideoFormat format)
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{
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switch (format) {
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case GST_VIDEO_FORMAT_I420:
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return VBI_PIXFMT_YUV420;
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case GST_VIDEO_FORMAT_YUY2:
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return VBI_PIXFMT_YUYV;
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case GST_VIDEO_FORMAT_YVYU:
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return VBI_PIXFMT_YVYU;
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case GST_VIDEO_FORMAT_UYVY:
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return VBI_PIXFMT_UYVY;
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case GST_VIDEO_FORMAT_VYUY:
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return VBI_PIXFMT_VYUY;
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default:
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g_assert_not_reached ();
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return (vbi_pixfmt) 0;
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}
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#undef NATIVE_VBI_FMT
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}
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static gboolean
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gst_line_21_encoder_set_info (GstVideoFilter * filter,
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GstCaps * incaps, GstVideoInfo * in_info,
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GstCaps * outcaps, GstVideoInfo * out_info)
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{
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GstLine21Encoder *self = GST_LINE21ENCODER (filter);
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self->info = *in_info;
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/*
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* Set up blank / black / white levels fit for NTSC, no actual relation
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* with the height of the video
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*/
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self->sp.scanning = 525;
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/* The pixel format */
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self->sp.sampling_format =
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vbi_pixfmt_from_gst_video_format (GST_VIDEO_INFO_FORMAT (&self->info));
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/* Sampling rate. For BT.601 it's 13.5MHz */
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self->sp.sampling_rate = 13.5e6;
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/* Stride */
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self->sp.bytes_per_line = GST_VIDEO_INFO_COMP_STRIDE (&self->info, 0);
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/* Horizontal offset of the VBI image */
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self->sp.offset = 122;
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/* FIXME: magic numbers */
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self->sp.start[0] = 21;
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self->sp.count[0] = 1;
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self->sp.start[1] = 284;
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self->sp.count[1] = 1;
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self->sp.interlaced = FALSE;
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self->sp.synchronous = TRUE;
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return TRUE;
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}
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static GstFlowReturn
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gst_line_21_encoder_transform_ip (GstVideoFilter * filter,
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GstVideoFrame * frame)
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{
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GstLine21Encoder *self = GST_LINE21ENCODER (filter);
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GstVideoCaptionMeta *cc_meta;
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guint8 *buf;
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vbi_sliced sliced[2];
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gpointer iter = NULL;
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GstFlowReturn ret = GST_FLOW_ERROR;
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sliced[0].id = VBI_SLICED_CAPTION_525_F1;
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sliced[0].line = self->sp.start[0];
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sliced[1].id = VBI_SLICED_CAPTION_525_F2;
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sliced[1].line = self->sp.start[1];
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sliced[0].data[0] = 0x80;
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sliced[0].data[1] = 0x80;
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sliced[1].data[0] = 0x80;
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sliced[1].data[1] = 0x80;
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/* We loop over caption metas until we find the first CEA608 meta */
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while ((cc_meta = (GstVideoCaptionMeta *)
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gst_buffer_iterate_meta_filtered (frame->buffer, &iter,
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GST_VIDEO_CAPTION_META_API_TYPE))) {
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guint n = cc_meta->size;
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guint i;
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if (cc_meta->caption_type != GST_VIDEO_CAPTION_TYPE_CEA608_S334_1A)
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continue;
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if (n % 3 != 0) {
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GST_ERROR_OBJECT (filter, "Invalid S334-1A CEA608 buffer size");
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goto done;
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}
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n /= 3;
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if (n >= 3) {
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GST_ERROR_OBJECT (filter, "Too many S334-1A CEA608 triplets %u", n);
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goto done;
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}
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for (i = 0; i < n; i++) {
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if (cc_meta->data[i * 3] & 0x80) {
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sliced[0].data[0] = cc_meta->data[i * 3 + 1];
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sliced[0].data[1] = cc_meta->data[i * 3 + 2];
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} else {
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sliced[1].data[0] = cc_meta->data[i * 3 + 1];
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sliced[1].data[1] = cc_meta->data[i * 3 + 2];
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}
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}
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break;
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}
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/* We've encoded this meta, it can now be removed */
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if (cc_meta)
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gst_buffer_remove_meta (frame->buffer, (GstMeta *) cc_meta);
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buf =
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(guint8 *) GST_VIDEO_FRAME_PLANE_DATA (frame,
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0) + 21 * GST_VIDEO_INFO_COMP_STRIDE (&self->info, 0);
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if (!vbi_raw_video_image (buf, GST_VIDEO_INFO_COMP_STRIDE (&self->info,
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0) * 2, &self->sp, 0, 0, 0, 0x000000FF, 0, sliced, 2)) {
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GST_ERROR_OBJECT (filter, "Failed to encode CC data");
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goto done;
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}
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ret = GST_FLOW_OK;
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done:
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return ret;
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}
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