gstreamer/ext/vorbis/vorbisparse.c

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/* GStreamer
* Copyright (C) <2004> Thomas Vander Stichele <thomas at apestaart dot 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "vorbisparse.h"
GST_DEBUG_CATEGORY_EXTERN (vorbisparse_debug);
#define GST_CAT_DEFAULT vorbisparse_debug
static GstElementDetails vorbis_parse_details = {
"VorbisParse",
"Codec/Parser/Audio",
"parse raw vorbis streams",
"Thomas Vander Stichele <thomas at apestaart dot org>"
};
/* Filter signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0
};
static GstStaticPadTemplate vorbis_parse_sink_factory =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-vorbis")
);
static GstStaticPadTemplate vorbis_parse_src_factory =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-vorbis")
);
GST_BOILERPLATE (GstVorbisParse, gst_vorbis_parse, GstElement,
GST_TYPE_ELEMENT);
static void vorbis_parse_chain (GstPad * pad, GstData * data);
static GstElementStateReturn vorbis_parse_change_state (GstElement * element);
static void
gst_vorbis_parse_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&vorbis_parse_src_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&vorbis_parse_sink_factory));
gst_element_class_set_details (element_class, &vorbis_parse_details);
}
static void
gst_vorbis_parse_class_init (GstVorbisParseClass * klass)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
gstelement_class->change_state = vorbis_parse_change_state;
}
static void
gst_vorbis_parse_init (GstVorbisParse * parse)
{
parse->sinkpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&vorbis_parse_sink_factory), "sink");
gst_pad_set_chain_function (parse->sinkpad, vorbis_parse_chain);
gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad);
parse->srcpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&vorbis_parse_src_factory), "src");
gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
}
static void
vorbis_parse_set_header_on_caps (GstVorbisParse * parse, GstCaps * caps)
{
GstBuffer *buf1, *buf2, *buf3;
g_assert (parse);
g_assert (parse->streamheader);
g_assert (parse->streamheader->next);
g_assert (parse->streamheader->next->next);
buf1 = parse->streamheader->data;
g_assert (buf1);
buf2 = parse->streamheader->next->data;
g_assert (buf2);
buf3 = parse->streamheader->next->next->data;
g_assert (buf3);
GstStructure *structure = gst_caps_get_structure (caps, 0);
GValue list = { 0 };
GValue value = { 0 };
/* mark buffers */
GST_BUFFER_FLAG_SET (buf1, GST_BUFFER_IN_CAPS);
GST_BUFFER_FLAG_SET (buf2, GST_BUFFER_IN_CAPS);
GST_BUFFER_FLAG_SET (buf3, GST_BUFFER_IN_CAPS);
/* put buffers in a fixed list */
g_value_init (&list, GST_TYPE_FIXED_LIST);
g_value_init (&value, GST_TYPE_BUFFER);
g_value_set_boxed (&value, buf1);
gst_value_list_append_value (&list, &value);
g_value_unset (&value);
g_value_init (&value, GST_TYPE_BUFFER);
g_value_set_boxed (&value, buf2);
gst_value_list_append_value (&list, &value);
g_value_unset (&value);
g_value_init (&value, GST_TYPE_BUFFER);
g_value_set_boxed (&value, buf3);
gst_value_list_append_value (&list, &value);
gst_structure_set_value (structure, "streamheader", &list);
g_value_unset (&value);
g_value_unset (&list);
}
static void
vorbis_parse_chain (GstPad * pad, GstData * data)
{
GstBuffer *buf;
GstVorbisParse *parse;
parse = GST_VORBIS_PARSE (gst_pad_get_parent (pad));
g_assert (parse);
buf = GST_BUFFER (data);
parse->packetno++;
/* if 1 <= packetno <= 3, it's streamheader,
* so put it on the streamheader list and return */
if (parse->packetno <= 3) {
parse->streamheader = g_list_append (parse->streamheader, buf);
return;
}
/* else, if we haven't sent streamheader buffers yet,
* set caps again, and send out the streamheader buffers */
if (!parse->streamheader_sent) {
/* mark and put on caps */
GstCaps *caps = gst_pad_get_caps (parse->srcpad);
vorbis_parse_set_header_on_caps (parse, caps);
/* negotiate with these caps */
GST_DEBUG ("here are the caps: %" GST_PTR_FORMAT, caps);
gst_pad_try_set_caps (parse->srcpad, caps);
/* push out buffers */
gst_pad_push (parse->srcpad, parse->streamheader->data);
gst_pad_push (parse->srcpad, parse->streamheader->next->data);
gst_pad_push (parse->srcpad, parse->streamheader->next->next->data);
parse->streamheader_sent = TRUE;
}
/* just send on buffer by default */
gst_pad_push (parse->srcpad, data);
}
static GstElementStateReturn
vorbis_parse_change_state (GstElement * element)
{
GstVorbisParse *parse = GST_VORBIS_PARSE (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_PAUSED_TO_READY:
parse->packetno = 0;
break;
default:
break;
}
return parent_class->change_state (element);
}