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277 lines
8.3 KiB
C
277 lines
8.3 KiB
C
/* GStreamer
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* Copyright (C) <2008> Thijs Vermeir <thijsvermeir@gmail.com>
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* Copyright (C) 2011 David Schleef <ds@schleef.org>
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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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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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 "string.h"
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#include "gstwebvttenc.h"
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#include <gst/controller/gstcontroller.h>
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GST_DEBUG_CATEGORY_STATIC (webvttenc_debug);
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#define GST_CAT_DEFAULT webvttenc_debug
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enum
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{
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ARG_0,
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ARG_TIMESTAMP,
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ARG_DURATION
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};
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static GstStaticPadTemplate src_template = 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 ("text/webvtt"));
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static GstStaticPadTemplate sink_template = 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 ("text/plain; text/x-pango-markup"));
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static GstFlowReturn gst_webvtt_enc_chain (GstPad * pad, GstBuffer * buf);
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static gchar *gst_webvtt_enc_timeconvertion (GstWebvttEnc * webvttenc,
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GstBuffer * buf);
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static gchar *gst_webvtt_enc_timestamp_to_string (GstClockTime timestamp);
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static void gst_webvtt_enc_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static void gst_webvtt_enc_reset (GstWebvttEnc * webvttenc);
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static void gst_webvtt_enc_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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GST_BOILERPLATE (GstWebvttEnc, gst_webvtt_enc, GstElement, GST_TYPE_ELEMENT);
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static gchar *
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gst_webvtt_enc_timestamp_to_string (GstClockTime timestamp)
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{
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guint h, m, s, ms;
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h = timestamp / (3600 * GST_SECOND);
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timestamp -= h * 3600 * GST_SECOND;
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m = timestamp / (60 * GST_SECOND);
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timestamp -= m * 60 * GST_SECOND;
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s = timestamp / GST_SECOND;
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timestamp -= s * GST_SECOND;
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ms = timestamp / GST_MSECOND;
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return g_strdup_printf ("%02d:%02d:%02d.%03d", h, m, s, ms);
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}
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static gchar *
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gst_webvtt_enc_timeconvertion (GstWebvttEnc * webvttenc, GstBuffer * buf)
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{
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gchar *start_time;
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gchar *stop_time;
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gchar *string;
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start_time = gst_webvtt_enc_timestamp_to_string (GST_BUFFER_TIMESTAMP (buf) +
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webvttenc->timestamp);
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if (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_DURATION (buf))) {
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stop_time = gst_webvtt_enc_timestamp_to_string (GST_BUFFER_TIMESTAMP (buf) +
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webvttenc->timestamp + GST_BUFFER_DURATION (buf) + webvttenc->duration);
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} else {
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stop_time = gst_webvtt_enc_timestamp_to_string (GST_BUFFER_TIMESTAMP (buf) +
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webvttenc->timestamp + webvttenc->duration);
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}
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string = g_strdup_printf ("%s --> %s\n", start_time, stop_time);
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g_free (start_time);
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g_free (stop_time);
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return string;
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}
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static GstFlowReturn
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gst_webvtt_enc_chain (GstPad * pad, GstBuffer * buf)
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{
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GstWebvttEnc *webvttenc;
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GstBuffer *new_buffer;
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gchar *timing;
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GstFlowReturn ret;
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webvttenc = GST_WEBVTT_ENC (gst_pad_get_parent_element (pad));
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if (!webvttenc->pushed_header) {
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const char *header = "WEBVTT\n\n";
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new_buffer = gst_buffer_new_and_alloc (strlen (header));
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memcpy (GST_BUFFER_DATA (new_buffer), header, strlen (header));
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GST_BUFFER_TIMESTAMP (new_buffer) = GST_CLOCK_TIME_NONE;
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GST_BUFFER_DURATION (new_buffer) = GST_CLOCK_TIME_NONE;
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ret = gst_pad_push (webvttenc->srcpad, new_buffer);
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if (ret != GST_FLOW_OK) {
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goto out;
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}
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webvttenc->pushed_header = TRUE;
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}
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gst_object_sync_values (GST_OBJECT (webvttenc), GST_BUFFER_TIMESTAMP (buf));
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timing = gst_webvtt_enc_timeconvertion (webvttenc, buf);
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new_buffer =
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gst_buffer_new_and_alloc (strlen (timing) + GST_BUFFER_SIZE (buf) + 1);
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memcpy (GST_BUFFER_DATA (new_buffer), timing, strlen (timing));
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memcpy (GST_BUFFER_DATA (new_buffer) + strlen (timing), GST_BUFFER_DATA (buf),
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GST_BUFFER_SIZE (buf));
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memcpy (GST_BUFFER_DATA (new_buffer) + GST_BUFFER_SIZE (new_buffer) - 1,
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"\n", 1);
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g_free (timing);
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GST_BUFFER_TIMESTAMP (new_buffer) = GST_BUFFER_TIMESTAMP (buf);
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GST_BUFFER_DURATION (new_buffer) = GST_BUFFER_DURATION (buf);
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ret = gst_pad_push (webvttenc->srcpad, new_buffer);
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out:
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gst_buffer_unref (buf);
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gst_object_unref (webvttenc);
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return ret;
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}
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static void
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gst_webvtt_enc_base_init (gpointer klass)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&sink_template));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&src_template));
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gst_element_class_set_details_simple (element_class,
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"WebVTT encoder", "Codec/Encoder/Subtitle",
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"WebVTT subtitle encoder", "David Schleef <ds@schleef.org>");
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}
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static void
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gst_webvtt_enc_reset (GstWebvttEnc * webvttenc)
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{
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webvttenc->counter = 1;
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}
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static GstStateChangeReturn
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gst_webvtt_enc_change_state (GstElement * element, GstStateChange transition)
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{
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GstStateChangeReturn ret;
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GstWebvttEnc *webvttenc = GST_WEBVTT_ENC (element);
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ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
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if (ret == GST_STATE_CHANGE_FAILURE)
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return ret;
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switch (transition) {
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case GST_STATE_CHANGE_PAUSED_TO_READY:
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gst_webvtt_enc_reset (webvttenc);
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break;
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default:
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break;
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}
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return ret;
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}
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static void
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gst_webvtt_enc_get_property (GObject * object,
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guint prop_id, GValue * value, GParamSpec * pspec)
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{
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GstWebvttEnc *webvttenc;
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webvttenc = GST_WEBVTT_ENC (object);
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switch (prop_id) {
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case ARG_TIMESTAMP:
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g_value_set_int64 (value, webvttenc->timestamp);
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break;
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case ARG_DURATION:
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g_value_set_int64 (value, webvttenc->duration);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_webvtt_enc_set_property (GObject * object,
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guint prop_id, const GValue * value, GParamSpec * pspec)
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{
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GstWebvttEnc *webvttenc;
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webvttenc = GST_WEBVTT_ENC (object);
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switch (prop_id) {
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case ARG_TIMESTAMP:
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webvttenc->timestamp = g_value_get_int64 (value);
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break;
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case ARG_DURATION:
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webvttenc->duration = g_value_get_int64 (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_webvtt_enc_class_init (GstWebvttEncClass * klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_webvtt_enc_set_property);
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gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_webvtt_enc_get_property);
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element_class->change_state = GST_DEBUG_FUNCPTR (gst_webvtt_enc_change_state);
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g_object_class_install_property (gobject_class, ARG_TIMESTAMP,
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g_param_spec_int64 ("timestamp", "Offset for the starttime",
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"Offset for the starttime for the subtitles", G_MININT64, G_MAXINT64,
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0,
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G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, ARG_DURATION,
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g_param_spec_int64 ("duration", "Offset for the duration",
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"Offset for the duration of the subtitles", G_MININT64, G_MAXINT64,
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0,
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G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
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GST_DEBUG_CATEGORY_INIT (webvttenc_debug, "webvttenc", 0,
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"SubRip subtitle encoder");
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}
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static void
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gst_webvtt_enc_init (GstWebvttEnc * webvttenc, GstWebvttEncClass * klass)
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{
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gst_webvtt_enc_reset (webvttenc);
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webvttenc->srcpad = gst_pad_new_from_static_template (&src_template, "src");
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gst_element_add_pad (GST_ELEMENT (webvttenc), webvttenc->srcpad);
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webvttenc->sinkpad =
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gst_pad_new_from_static_template (&sink_template, "sink");
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gst_element_add_pad (GST_ELEMENT (webvttenc), webvttenc->sinkpad);
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gst_pad_set_chain_function (webvttenc->sinkpad, gst_webvtt_enc_chain);
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}
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