/* GStreamer * Copyright (C) <2008> Thijs Vermeir <thijsvermeir@gmail.com> * Copyright (C) 2011 David Schleef <ds@schleef.org> * * 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 St, Fifth Floor, * Boston, MA 02110-1301, USA. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include <string.h> #include "gstwebvttenc.h" GST_DEBUG_CATEGORY_STATIC (webvttenc_debug); #define GST_CAT_DEFAULT webvttenc_debug enum { PROP_0, PROP_TIMESTAMP, PROP_DURATION }; static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("application/x-subtitle-vtt")); static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("text/x-raw, format = { pango-markup, utf8 }")); static GstFlowReturn gst_webvtt_enc_chain (GstPad * pad, GstObject * parent, GstBuffer * buf); static void gst_webvtt_enc_append_timestamp_to_string (GstClockTime timestamp, GString * str); static void gst_webvtt_enc_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static void gst_webvtt_enc_reset (GstWebvttEnc * webvttenc); static void gst_webvtt_enc_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); #define parent_class gst_webvtt_enc_parent_class G_DEFINE_TYPE (GstWebvttEnc, gst_webvtt_enc, GST_TYPE_ELEMENT); static void gst_webvtt_enc_append_timestamp_to_string (GstClockTime timestamp, GString * str) { guint h, m, s, ms; h = timestamp / (3600 * GST_SECOND); timestamp -= h * 3600 * GST_SECOND; m = timestamp / (60 * GST_SECOND); timestamp -= m * 60 * GST_SECOND; s = timestamp / GST_SECOND; timestamp -= s * GST_SECOND; ms = timestamp / GST_MSECOND; g_string_append_printf (str, "%02d:%02d:%02d.%03d", h, m, s, ms); } static GstFlowReturn gst_webvtt_enc_chain (GstPad * pad, GstObject * parent, GstBuffer * buf) { GstWebvttEnc *webvttenc = GST_WEBVTT_ENC (parent); GstClockTime ts, dur = GST_SECOND; GstBuffer *new_buffer; GstMapInfo map_info; GstFlowReturn ret; GString *s; gsize buf_size; if (!webvttenc->pushed_header) { const char *header = "WEBVTT\n\n"; new_buffer = gst_buffer_new_wrapped (g_strdup (header), strlen (header)); GST_BUFFER_PTS (new_buffer) = GST_CLOCK_TIME_NONE; GST_BUFFER_DURATION (new_buffer) = GST_CLOCK_TIME_NONE; ret = gst_pad_push (webvttenc->srcpad, new_buffer); if (ret != GST_FLOW_OK) goto out; webvttenc->pushed_header = TRUE; } gst_object_sync_values (GST_OBJECT (webvttenc), GST_BUFFER_PTS (buf)); ts = GST_BUFFER_PTS (buf) + webvttenc->timestamp; if (GST_BUFFER_DURATION_IS_VALID (buf)) dur = GST_BUFFER_DURATION (buf) + webvttenc->duration; else if (webvttenc->duration > 0) dur = webvttenc->duration; else dur = GST_SECOND; buf_size = gst_buffer_get_size (buf); s = g_string_sized_new (50 + buf_size + 1 + 1); /* start_time --> end_time */ gst_webvtt_enc_append_timestamp_to_string (ts, s); g_string_append_printf (s, " --> "); gst_webvtt_enc_append_timestamp_to_string (ts + dur, s); g_string_append_c (s, '\n'); /* text */ if (gst_buffer_map (buf, &map_info, GST_MAP_READ)) { g_string_append_len (s, (const gchar *) map_info.data, map_info.size); gst_buffer_unmap (buf, &map_info); } g_string_append (s, "\n\n"); buf_size = s->len; new_buffer = gst_buffer_new_wrapped (g_string_free (s, FALSE), buf_size); GST_BUFFER_TIMESTAMP (new_buffer) = GST_BUFFER_TIMESTAMP (buf); GST_BUFFER_DURATION (new_buffer) = GST_BUFFER_DURATION (buf); ret = gst_pad_push (webvttenc->srcpad, new_buffer); out: gst_buffer_unref (buf); return ret; } static gboolean gst_webvtt_enc_event (GstPad * pad, GstObject * parent, GstEvent * event) { GstWebvttEnc *webvttenc = GST_WEBVTT_ENC (parent); gboolean ret; switch (GST_EVENT_TYPE (event)) { case GST_EVENT_CAPS: { GstCaps *caps; caps = gst_static_pad_template_get_caps (&src_template); gst_pad_set_caps (webvttenc->srcpad, caps); gst_caps_unref (caps); gst_event_unref (event); ret = TRUE; break; } default: ret = gst_pad_event_default (pad, parent, event); break; } return ret; } static void gst_webvtt_enc_reset (GstWebvttEnc * webvttenc) { webvttenc->counter = 1; } static GstStateChangeReturn gst_webvtt_enc_change_state (GstElement * element, GstStateChange transition) { GstStateChangeReturn ret; GstWebvttEnc *webvttenc = GST_WEBVTT_ENC (element); ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); if (ret == GST_STATE_CHANGE_FAILURE) return ret; switch (transition) { case GST_STATE_CHANGE_PAUSED_TO_READY: gst_webvtt_enc_reset (webvttenc); break; default: break; } return ret; } static void gst_webvtt_enc_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstWebvttEnc *webvttenc; webvttenc = GST_WEBVTT_ENC (object); switch (prop_id) { case PROP_TIMESTAMP: g_value_set_int64 (value, webvttenc->timestamp); break; case PROP_DURATION: g_value_set_int64 (value, webvttenc->duration); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_webvtt_enc_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstWebvttEnc *webvttenc; webvttenc = GST_WEBVTT_ENC (object); switch (prop_id) { case PROP_TIMESTAMP: webvttenc->timestamp = g_value_get_int64 (value); break; case PROP_DURATION: webvttenc->duration = g_value_get_int64 (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_webvtt_enc_class_init (GstWebvttEncClass * klass) { GObjectClass *gobject_class = G_OBJECT_CLASS (klass); GstElementClass *element_class = GST_ELEMENT_CLASS (klass); gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_webvtt_enc_set_property); gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_webvtt_enc_get_property); element_class->change_state = GST_DEBUG_FUNCPTR (gst_webvtt_enc_change_state); g_object_class_install_property (gobject_class, PROP_TIMESTAMP, g_param_spec_int64 ("timestamp", "Offset for the starttime", "Offset for the starttime for the subtitles", G_MININT64, G_MAXINT64, 0, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_DURATION, g_param_spec_int64 ("duration", "Offset for the duration", "Offset for the duration of the subtitles", G_MININT64, G_MAXINT64, 0, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS)); gst_element_class_add_static_pad_template (element_class, &sink_template); gst_element_class_add_static_pad_template (element_class, &src_template); gst_element_class_set_static_metadata (element_class, "WebVTT encoder", "Codec/Encoder/Subtitle", "WebVTT subtitle encoder", "David Schleef <ds@schleef.org>"); GST_DEBUG_CATEGORY_INIT (webvttenc_debug, "webvttenc", 0, "SubRip subtitle encoder"); } static void gst_webvtt_enc_init (GstWebvttEnc * webvttenc) { gst_webvtt_enc_reset (webvttenc); webvttenc->srcpad = gst_pad_new_from_static_template (&src_template, "src"); gst_element_add_pad (GST_ELEMENT (webvttenc), webvttenc->srcpad); webvttenc->sinkpad = gst_pad_new_from_static_template (&sink_template, "sink"); gst_pad_set_chain_function (webvttenc->sinkpad, GST_DEBUG_FUNCPTR (gst_webvtt_enc_chain)); gst_pad_set_event_function (webvttenc->sinkpad, GST_DEBUG_FUNCPTR (gst_webvtt_enc_event)); gst_element_add_pad (GST_ELEMENT (webvttenc), webvttenc->sinkpad); }