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451 lines
12 KiB
C
451 lines
12 KiB
C
/* GStreamer
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* Copyright (C) 2006 Wim Taymans <wim@fluendo.com>
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*
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* gstoggaviparse.c: ogg avi stream parser
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/*
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* Ogg in AVI is mostly done for vorbis audio. In the codec_data we receive the
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* first 3 packets of the raw vorbis data. On the sinkpad we receive full-blown Ogg
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* pages.
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* Before extracting the packets out of the ogg pages, we push the raw vorbis
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* header packets to the decoder.
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* We don't use the incoming timestamps but use the ganulepos on the ogg pages
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* directly.
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* This parser only does ogg/vorbis for now.
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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 <gst/gst.h>
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#include <ogg/ogg.h>
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#include <string.h>
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#include "gstoggelements.h"
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GST_DEBUG_CATEGORY_STATIC (gst_ogg_avi_parse_debug);
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#define GST_CAT_DEFAULT gst_ogg_avi_parse_debug
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#define GST_TYPE_OGG_AVI_PARSE (gst_ogg_avi_parse_get_type())
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#define GST_OGG_AVI_PARSE(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_OGG_AVI_PARSE, GstOggAviParse))
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#define GST_OGG_AVI_PARSE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_OGG_AVI_PARSE, GstOggAviParse))
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#define GST_IS_OGG_AVI_PARSE(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_OGG_AVI_PARSE))
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#define GST_IS_OGG_AVI_PARSE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_OGG_AVI_PARSE))
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static GType gst_ogg_avi_parse_get_type (void);
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typedef struct _GstOggAviParse GstOggAviParse;
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typedef struct _GstOggAviParseClass GstOggAviParseClass;
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struct _GstOggAviParse
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{
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GstElement element;
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GstPad *sinkpad;
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GstPad *srcpad;
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gboolean discont;
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gint serial;
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ogg_sync_state sync;
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ogg_stream_state stream;
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};
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struct _GstOggAviParseClass
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{
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GstElementClass parent_class;
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};
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static GstElementClass *parent_class = NULL;
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G_DEFINE_TYPE (GstOggAviParse, gst_ogg_avi_parse, GST_TYPE_ELEMENT);
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GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (oggaviparse, "oggaviparse",
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GST_RANK_PRIMARY, GST_TYPE_OGG_AVI_PARSE,
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GST_DEBUG_CATEGORY_INIT (gst_ogg_avi_parse_debug, "oggaviparse", 0,
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"ogg avi parser"));
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enum
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{
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PROP_0
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};
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static GstStaticPadTemplate ogg_avi_parse_src_template_factory =
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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 ("audio/x-vorbis")
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);
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static GstStaticPadTemplate ogg_avi_parse_sink_template_factory =
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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 ("application/x-ogg-avi")
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);
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static void gst_ogg_avi_parse_finalize (GObject * object);
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static GstStateChangeReturn gst_ogg_avi_parse_change_state (GstElement *
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element, GstStateChange transition);
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static gboolean gst_ogg_avi_parse_event (GstPad * pad, GstObject * parent,
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GstEvent * event);
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static GstFlowReturn gst_ogg_avi_parse_chain (GstPad * pad,
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GstObject * parent, GstBuffer * buffer);
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static gboolean gst_ogg_avi_parse_setcaps (GstPad * pad, GstCaps * caps);
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static void
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gst_ogg_avi_parse_class_init (GstOggAviParseClass * klass)
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{
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GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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gst_element_class_set_static_metadata (gstelement_class,
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"Ogg AVI parser", "Codec/Parser",
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"parse an ogg avi stream into pages (info about ogg: http://xiph.org)",
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"Wim Taymans <wim@fluendo.com>");
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gst_element_class_add_static_pad_template (gstelement_class,
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&ogg_avi_parse_sink_template_factory);
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gst_element_class_add_static_pad_template (gstelement_class,
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&ogg_avi_parse_src_template_factory);
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parent_class = g_type_class_peek_parent (klass);
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gstelement_class->change_state = gst_ogg_avi_parse_change_state;
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gobject_class->finalize = gst_ogg_avi_parse_finalize;
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}
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static void
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gst_ogg_avi_parse_init (GstOggAviParse * ogg)
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{
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/* create the sink and source pads */
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ogg->sinkpad =
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gst_pad_new_from_static_template (&ogg_avi_parse_sink_template_factory,
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"sink");
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gst_pad_set_event_function (ogg->sinkpad, gst_ogg_avi_parse_event);
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gst_pad_set_chain_function (ogg->sinkpad, gst_ogg_avi_parse_chain);
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gst_element_add_pad (GST_ELEMENT (ogg), ogg->sinkpad);
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ogg->srcpad =
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gst_pad_new_from_static_template (&ogg_avi_parse_src_template_factory,
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"src");
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gst_pad_use_fixed_caps (ogg->srcpad);
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gst_element_add_pad (GST_ELEMENT (ogg), ogg->srcpad);
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}
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static void
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gst_ogg_avi_parse_finalize (GObject * object)
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{
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GstOggAviParse *ogg = GST_OGG_AVI_PARSE (object);
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GST_LOG_OBJECT (ogg, "Disposing of object %p", ogg);
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ogg_sync_clear (&ogg->sync);
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ogg_stream_clear (&ogg->stream);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static gboolean
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gst_ogg_avi_parse_setcaps (GstPad * pad, GstCaps * caps)
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{
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GstOggAviParse *ogg;
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GstStructure *structure;
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const GValue *codec_data;
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GstBuffer *buffer;
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GstMapInfo map;
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guint8 *ptr;
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gsize left;
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guint32 sizes[3];
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GstCaps *outcaps;
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gint i, offs;
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ogg = GST_OGG_AVI_PARSE (GST_OBJECT_PARENT (pad));
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structure = gst_caps_get_structure (caps, 0);
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/* take codec data */
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codec_data = gst_structure_get_value (structure, "codec_data");
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if (codec_data == NULL)
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goto no_data;
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/* only buffers are valid */
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if (G_VALUE_TYPE (codec_data) != GST_TYPE_BUFFER)
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goto wrong_format;
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/* Now parse the data */
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buffer = gst_value_get_buffer (codec_data);
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/* first 22 bytes are bits_per_sample, channel_mask, GUID
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* Then we get 3 LE guint32 with the 3 header sizes
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* then we get the bytes of the 3 headers. */
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gst_buffer_map (buffer, &map, GST_MAP_READ);
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ptr = map.data;
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left = map.size;
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GST_LOG_OBJECT (ogg, "configuring codec_data of size %" G_GSIZE_FORMAT, left);
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/* skip headers */
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ptr += 22;
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left -= 22;
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/* we need at least 12 bytes for the packet sizes of the 3 headers */
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if (left < 12)
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goto buffer_too_small;
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/* read sizes of the 3 headers */
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sizes[0] = GST_READ_UINT32_LE (ptr);
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sizes[1] = GST_READ_UINT32_LE (ptr + 4);
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sizes[2] = GST_READ_UINT32_LE (ptr + 8);
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GST_DEBUG_OBJECT (ogg, "header sizes: %u %u %u", sizes[0], sizes[1],
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sizes[2]);
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left -= 12;
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/* and we need at least enough data for all the headers */
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if (left < sizes[0] + sizes[1] + sizes[2])
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goto buffer_too_small;
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/* set caps */
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outcaps = gst_caps_new_empty_simple ("audio/x-vorbis");
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gst_pad_set_caps (ogg->srcpad, outcaps);
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gst_caps_unref (outcaps);
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/* copy header data */
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offs = 34;
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for (i = 0; i < 3; i++) {
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GstBuffer *out;
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/* now output the raw vorbis header packets */
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out = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, offs, sizes[i]);
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gst_pad_push (ogg->srcpad, out);
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offs += sizes[i];
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}
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gst_buffer_unmap (buffer, &map);
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return TRUE;
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/* ERRORS */
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no_data:
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{
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GST_DEBUG_OBJECT (ogg, "no codec_data found in caps");
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return FALSE;
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}
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wrong_format:
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{
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GST_DEBUG_OBJECT (ogg, "codec_data is not a buffer");
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return FALSE;
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}
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buffer_too_small:
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{
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GST_DEBUG_OBJECT (ogg, "codec_data is too small");
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gst_buffer_unmap (buffer, &map);
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return FALSE;
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}
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}
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static gboolean
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gst_ogg_avi_parse_event (GstPad * pad, GstObject * parent, GstEvent * event)
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{
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GstOggAviParse *ogg;
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gboolean ret;
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ogg = GST_OGG_AVI_PARSE (parent);
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_CAPS:
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{
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GstCaps *caps;
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gst_event_parse_caps (event, &caps);
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ret = gst_ogg_avi_parse_setcaps (pad, caps);
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gst_event_unref (event);
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break;
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}
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case GST_EVENT_FLUSH_START:
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ret = gst_pad_push_event (ogg->srcpad, event);
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break;
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case GST_EVENT_FLUSH_STOP:
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ogg_sync_reset (&ogg->sync);
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ogg_stream_reset (&ogg->stream);
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ogg->discont = TRUE;
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ret = gst_pad_push_event (ogg->srcpad, event);
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break;
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default:
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ret = gst_pad_push_event (ogg->srcpad, event);
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break;
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}
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return ret;
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}
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static GstFlowReturn
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gst_ogg_avi_parse_push_packet (GstOggAviParse * ogg, ogg_packet * packet)
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{
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GstBuffer *buffer;
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GstFlowReturn result;
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/* allocate space for header and body */
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buffer = gst_buffer_new_and_alloc (packet->bytes);
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gst_buffer_fill (buffer, 0, packet->packet, packet->bytes);
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GST_LOG_OBJECT (ogg, "created buffer %p from page", buffer);
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GST_BUFFER_OFFSET_END (buffer) = packet->granulepos;
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if (ogg->discont) {
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GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
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ogg->discont = FALSE;
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}
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result = gst_pad_push (ogg->srcpad, buffer);
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return result;
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}
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static GstFlowReturn
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gst_ogg_avi_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
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{
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GstFlowReturn result = GST_FLOW_OK;
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GstOggAviParse *ogg;
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guint size;
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gchar *oggbuf;
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gint ret = -1;
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ogg = GST_OGG_AVI_PARSE (parent);
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size = gst_buffer_get_size (buffer);
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GST_LOG_OBJECT (ogg, "Chain function received buffer of size %d", size);
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if (GST_BUFFER_IS_DISCONT (buffer)) {
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ogg_sync_reset (&ogg->sync);
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ogg->discont = TRUE;
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}
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/* write data to sync layer */
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oggbuf = ogg_sync_buffer (&ogg->sync, size);
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gst_buffer_extract (buffer, 0, oggbuf, size);
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ogg_sync_wrote (&ogg->sync, size);
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gst_buffer_unref (buffer);
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/* try to get as many packets out of the stream as possible */
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do {
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ogg_page page;
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/* try to swap out a page */
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ret = ogg_sync_pageout (&ogg->sync, &page);
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if (ret == 0) {
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GST_DEBUG_OBJECT (ogg, "need more data");
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break;
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} else if (ret == -1) {
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GST_DEBUG_OBJECT (ogg, "discont in pages");
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ogg->discont = TRUE;
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} else {
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/* new unknown stream, init the ogg stream with the serial number of the
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* page. */
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if (ogg->serial == -1) {
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ogg->serial = ogg_page_serialno (&page);
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ogg_stream_init (&ogg->stream, ogg->serial);
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}
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/* submit page */
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if (ogg_stream_pagein (&ogg->stream, &page) != 0) {
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GST_WARNING_OBJECT (ogg, "ogg stream choked on page resetting stream");
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ogg_sync_reset (&ogg->sync);
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ogg->discont = TRUE;
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continue;
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}
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/* try to get as many packets as possible out of the page */
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do {
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ogg_packet packet;
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ret = ogg_stream_packetout (&ogg->stream, &packet);
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GST_LOG_OBJECT (ogg, "packetout gave %d", ret);
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switch (ret) {
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case 0:
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break;
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case -1:
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/* out of sync, We mark a DISCONT. */
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ogg->discont = TRUE;
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break;
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case 1:
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result = gst_ogg_avi_parse_push_packet (ogg, &packet);
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if (result != GST_FLOW_OK)
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goto done;
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break;
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default:
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GST_WARNING_OBJECT (ogg,
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"invalid return value %d for ogg_stream_packetout, resetting stream",
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ret);
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break;
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}
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}
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while (ret != 0);
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}
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}
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while (ret != 0);
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done:
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return result;
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}
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static GstStateChangeReturn
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gst_ogg_avi_parse_change_state (GstElement * element, GstStateChange transition)
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{
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GstOggAviParse *ogg;
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GstStateChangeReturn result = GST_STATE_CHANGE_FAILURE;
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ogg = GST_OGG_AVI_PARSE (element);
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switch (transition) {
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case GST_STATE_CHANGE_NULL_TO_READY:
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ogg_sync_init (&ogg->sync);
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break;
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case GST_STATE_CHANGE_READY_TO_PAUSED:
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ogg_sync_reset (&ogg->sync);
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ogg_stream_reset (&ogg->stream);
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ogg->serial = -1;
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ogg->discont = TRUE;
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break;
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case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
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break;
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default:
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break;
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}
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result = parent_class->change_state (element, transition);
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switch (transition) {
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case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
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break;
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case GST_STATE_CHANGE_PAUSED_TO_READY:
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break;
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case GST_STATE_CHANGE_READY_TO_NULL:
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ogg_sync_clear (&ogg->sync);
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break;
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default:
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break;
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}
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return result;
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}
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