| /* 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 |
| { |
| ARG_0, |
| ARG_TIMESTAMP, |
| ARG_DURATION |
| }; |
| |
| static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src", |
| GST_PAD_SRC, |
| GST_PAD_ALWAYS, |
| GST_STATIC_CAPS ("text/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 ARG_TIMESTAMP: |
| g_value_set_int64 (value, webvttenc->timestamp); |
| break; |
| case ARG_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 ARG_TIMESTAMP: |
| webvttenc->timestamp = g_value_get_int64 (value); |
| break; |
| case ARG_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, ARG_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, ARG_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_pad_template (element_class, |
| gst_static_pad_template_get (&sink_template)); |
| gst_element_class_add_pad_template (element_class, |
| gst_static_pad_template_get (&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); |
| } |