gstreamer/ext/kate/gstkateutil.c

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/* GStreamer
* Copyright (C) 2008 Vincent Penquerc'h <ogg.k.ogg.k@googlemail.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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
2009-07-19 22:35:05 +00:00
/* FIXME: shouldn't all this GstKateDecoderBase stuff really be a base class? */
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <gst/tag/tag.h>
#include "gstkate.h"
#include "gstkateutil.h"
GstCaps *
gst_kate_util_set_header_on_caps (GstElement * element, GstCaps * caps,
GList * headers)
{
GstStructure *structure;
GValue array = { 0 };
GST_LOG_OBJECT (element, "caps: %" GST_PTR_FORMAT, caps);
if (G_UNLIKELY (!caps))
return NULL;
if (G_UNLIKELY (!headers))
return NULL;
caps = gst_caps_make_writable (caps);
structure = gst_caps_get_structure (caps, 0);
g_value_init (&array, GST_TYPE_ARRAY);
while (headers) {
GValue value = { 0 };
GstBuffer *buffer = headers->data;
g_assert (buffer);
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_IN_CAPS);
g_value_init (&value, GST_TYPE_BUFFER);
/* as in theoraenc, we need to copy to avoid circular references */
buffer = gst_buffer_copy (buffer);
gst_value_set_buffer (&value, buffer);
gst_buffer_unref (buffer);
gst_value_array_append_value (&array, &value);
g_value_unset (&value);
headers = headers->next;
}
gst_structure_set_value (structure, "streamheader", &array);
g_value_unset (&array);
GST_LOG_OBJECT (element, "here are the newly set caps: %" GST_PTR_FORMAT,
caps);
return caps;
}
void
gst_kate_util_install_decoder_base_properties (GObjectClass * gobject_class)
{
g_object_class_install_property (gobject_class, ARG_DEC_BASE_LANGUAGE,
g_param_spec_string ("language", "Language", "The language of the stream",
"", G_PARAM_READABLE));
g_object_class_install_property (gobject_class, ARG_DEC_BASE_CATEGORY,
g_param_spec_string ("category", "Category", "The category of the stream",
"", G_PARAM_READABLE));
g_object_class_install_property (gobject_class,
ARG_DEC_BASE_ORIGINAL_CANVAS_WIDTH,
g_param_spec_int ("original-canvas-width",
"Original canvas width (0 is unspecified)",
"The canvas width this stream was authored for", 0, G_MAXINT, 0,
G_PARAM_READABLE));
g_object_class_install_property (gobject_class,
ARG_DEC_BASE_ORIGINAL_CANVAS_HEIGHT,
g_param_spec_int ("original-canvas-height", "Original canvas height",
"The canvas height this stream was authored for (0 is unspecified)",
0, G_MAXINT, 0, G_PARAM_READABLE));
}
void
gst_kate_util_decode_base_init (GstKateDecoderBase * decoder)
{
if (G_UNLIKELY (!decoder))
return;
decoder->language = NULL;
decoder->category = NULL;
decoder->original_canvas_width = 0;
decoder->original_canvas_height = 0;
decoder->tags = NULL;
decoder->initialized = FALSE;
}
static void
gst_kate_util_decode_base_reset (GstKateDecoderBase * decoder)
{
g_free (decoder->language);
decoder->language = NULL;
g_free (decoder->category);
decoder->category = NULL;
if (decoder->tags) {
gst_tag_list_free (decoder->tags);
decoder->tags = NULL;
}
decoder->original_canvas_width = 0;
decoder->original_canvas_height = 0;
decoder->initialized = FALSE;
}
gboolean
gst_kate_util_decoder_base_get_property (GstKateDecoderBase * decoder,
GObject * object, guint prop_id, GValue * value, GParamSpec * pspec)
{
gboolean res = TRUE;
switch (prop_id) {
case ARG_DEC_BASE_LANGUAGE:
g_value_set_string (value, decoder->language);
break;
case ARG_DEC_BASE_CATEGORY:
g_value_set_string (value, decoder->category);
break;
case ARG_DEC_BASE_ORIGINAL_CANVAS_WIDTH:
g_value_set_int (value, decoder->original_canvas_width);
break;
case ARG_DEC_BASE_ORIGINAL_CANVAS_HEIGHT:
g_value_set_int (value, decoder->original_canvas_height);
break;
default:
res = FALSE;
break;
}
return res;
}
GstFlowReturn
gst_kate_util_decoder_base_chain_kate_packet (GstKateDecoderBase * decoder,
GstElement * element, GstPad * pad, GstBuffer * buf, GstPad * srcpad,
const kate_event ** ev)
{
kate_packet kp;
int ret;
GstFlowReturn rflow = GST_FLOW_OK;
GST_DEBUG_OBJECT (element, "got kate packet, %u bytes, type %02x",
GST_BUFFER_SIZE (buf),
GST_BUFFER_SIZE (buf) == 0 ? -1 : GST_BUFFER_DATA (buf)[0]);
kate_packet_wrap (&kp, GST_BUFFER_SIZE (buf), GST_BUFFER_DATA (buf));
ret = kate_high_decode_packetin (&decoder->k, &kp, ev);
if (G_UNLIKELY (ret < 0)) {
GST_ELEMENT_ERROR (element, STREAM, DECODE, (NULL),
("Failed to decode Kate packet: %d", ret));
return GST_FLOW_ERROR;
} else if (G_UNLIKELY (ret > 0)) {
GST_DEBUG_OBJECT (element,
"kate_high_decode_packetin has received EOS packet");
return GST_FLOW_OK;
}
/* headers may be interesting to retrieve information from */
if (G_LIKELY (GST_BUFFER_SIZE (buf) > 0))
switch (GST_BUFFER_DATA (buf)[0]) {
GstCaps *caps;
case 0x80: /* ID header */
GST_INFO_OBJECT (element, "Parsed ID header: language %s, category %s",
decoder->k.ki->language, decoder->k.ki->category);
caps = gst_caps_new_simple ("text/x-pango-markup", NULL);
gst_pad_set_caps (srcpad, caps);
gst_caps_unref (caps);
if (decoder->k.ki->language && *decoder->k.ki->language) {
GstTagList *old = decoder->tags, *tags = gst_tag_list_new ();
if (tags) {
gchar *lang_code;
/* en_GB -> en */
lang_code = g_ascii_strdown (decoder->k.ki->language, -1);
g_strdelimit (lang_code, NULL, '\0');
gst_tag_list_add (tags, GST_TAG_MERGE_APPEND, GST_TAG_LANGUAGE_CODE,
lang_code, NULL);
g_free (lang_code);
/* TODO: category - where should it go ? */
decoder->tags =
gst_tag_list_merge (decoder->tags, tags, GST_TAG_MERGE_REPLACE);
gst_tag_list_free (tags);
if (old)
gst_tag_list_free (old);
}
}
/* update properties */
if (decoder->language)
g_free (decoder->language);
decoder->language = g_strdup (decoder->k.ki->language);
if (decoder->category)
g_free (decoder->category);
decoder->category = g_strdup (decoder->k.ki->category);
decoder->original_canvas_width = decoder->k.ki->original_canvas_width;
decoder->original_canvas_height = decoder->k.ki->original_canvas_height;
break;
case 0x81: /* Vorbis comments header */
GST_INFO_OBJECT (element, "Parsed comments header");
{
gchar *encoder = NULL;
GstTagList *old = decoder->tags, *list =
gst_tag_list_from_vorbiscomment_buffer (buf,
(const guint8 *) "\201kate\0\0\0\0", 9, &encoder);
if (list) {
decoder->tags =
gst_tag_list_merge (decoder->tags, list, GST_TAG_MERGE_REPLACE);
gst_tag_list_free (list);
}
if (!decoder->tags) {
GST_ERROR_OBJECT (element, "failed to decode comment header");
decoder->tags = gst_tag_list_new ();
}
if (encoder) {
gst_tag_list_add (decoder->tags, GST_TAG_MERGE_REPLACE,
GST_TAG_ENCODER, encoder, NULL);
g_free (encoder);
}
gst_tag_list_add (decoder->tags, GST_TAG_MERGE_REPLACE,
GST_TAG_SUBTITLE_CODEC, "Kate", NULL);
gst_tag_list_add (decoder->tags, GST_TAG_MERGE_REPLACE,
GST_TAG_ENCODER_VERSION, decoder->k.ki->bitstream_version_major,
NULL);
if (old)
gst_tag_list_free (old);
if (decoder->initialized) {
gst_element_found_tags_for_pad (element, srcpad, decoder->tags);
decoder->tags = NULL;
} else {
/* Only push them as messages for the time being. *
* They will be pushed on the pad once the decoder is initialized */
gst_element_post_message (element,
gst_message_new_tag (GST_OBJECT (element),
gst_tag_list_copy (decoder->tags)));
}
}
break;
default:
break;
}
return rflow;
}
GstStateChangeReturn
gst_kate_decoder_base_change_state (GstKateDecoderBase * decoder,
GstElement * element, GstElementClass * parent_class,
GstStateChange transition)
{
GstStateChangeReturn res;
int ret;
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
GST_DEBUG_OBJECT (element, "READY -> PAUSED, initializing kate state");
ret = kate_high_decode_init (&decoder->k);
if (ret < 0) {
GST_WARNING_OBJECT (element, "failed to initialize kate state: %d",
ret);
}
decoder->initialized = TRUE;
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
break;
default:
break;
}
res = parent_class->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
GST_DEBUG_OBJECT (element, "PAUSED -> READY, clearing kate state");
if (decoder->initialized) {
kate_high_decode_clear (&decoder->k);
decoder->initialized = FALSE;
}
gst_kate_util_decode_base_reset (decoder);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
gst_kate_util_decode_base_reset (decoder);
break;
default:
break;
}
return res;
}
static GstClockTime
gst_kate_util_granule_time (kate_state * k, gint64 granulepos)
{
if (G_UNLIKELY (granulepos == -1))
return -1;
return kate_granule_time (k->ki, granulepos) * GST_SECOND;
}
/*
conversions on the sink:
- default is granules at num/den rate (subject to the granule shift)
- default -> time is possible
- bytes do not mean anything, packets can be any number of bytes, and we
have no way to know the number of bytes emitted without decoding
conversions on the source:
- nothing
*/
gboolean
gst_kate_decoder_base_convert (GstKateDecoderBase * decoder,
GstElement * element, GstPad * pad, GstFormat src_fmt, gint64 src_val,
GstFormat * dest_fmt, gint64 * dest_val)
{
gboolean res = FALSE;
if (src_fmt == *dest_fmt) {
*dest_val = src_val;
return TRUE;
}
if (!decoder->initialized) {
GST_WARNING_OBJECT (element, "not initialized yet");
return FALSE;
}
if (src_fmt == GST_FORMAT_BYTES || *dest_fmt == GST_FORMAT_BYTES) {
GST_WARNING_OBJECT (element, "unsupported format");
return FALSE;
}
switch (src_fmt) {
case GST_FORMAT_DEFAULT:
switch (*dest_fmt) {
case GST_FORMAT_TIME:
*dest_val = gst_kate_util_granule_time (&decoder->k, src_val);
res = TRUE;
break;
default:
res = FALSE;
break;
}
break;
default:
res = FALSE;
break;
}
if (!res) {
GST_WARNING_OBJECT (element, "unsupported format");
}
return res;
}
gboolean
gst_kate_decoder_base_sink_query (GstKateDecoderBase * decoder,
GstElement * element, GstPad * pad, GstQuery * query)
{
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CONVERT:
{
GstFormat src_fmt, dest_fmt;
gint64 src_val, dest_val;
gst_query_parse_convert (query, &src_fmt, &src_val, &dest_fmt, &dest_val);
if (!gst_kate_decoder_base_convert (decoder, element, pad, src_fmt,
src_val, &dest_fmt, &dest_val)) {
return gst_pad_query_default (pad, query);
}
gst_query_set_convert (query, src_fmt, src_val, dest_fmt, dest_val);
return TRUE;
}
default:
return gst_pad_query_default (pad, query);
}
}