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gstreamer/ext/ogg/gstogmparse.c
Tim-Philipp Müller 5f59b4f7ee Fix FSF address 
https://bugzilla.gnome.org/show_bug.cgi?id=687520
2012-11-03 23:05:09 +00:00

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/* GStreamer OGM parsing
* Copyright (C) 2004 Ronald Bultje <rbultje@ronald.bitfreak.net>
* Copyright (C) 2006 Tim-Philipp Müller <tim centricular net>
*
* 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 <stdio.h>
#include <string.h>
#include <gst/gst.h>
#include <gst/tag/tag.h>
#include <gst/riff/riff-media.h>
#include <gst/riff/riff-read.h>
#include "gstogg.h"
GST_DEBUG_CATEGORY_STATIC (gst_ogm_parse_debug);
#define GST_CAT_DEFAULT gst_ogm_parse_debug
#define GST_TYPE_OGM_VIDEO_PARSE (gst_ogm_video_parse_get_type())
#define GST_IS_OGM_VIDEO_PARSE(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj), GST_TYPE_OGM_VIDEO_PARSE))
#define GST_TYPE_OGM_AUDIO_PARSE (gst_ogm_audio_parse_get_type())
#define GST_IS_OGM_AUDIO_PARSE(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj), GST_TYPE_OGM_AUDIO_PARSE))
#define GST_TYPE_OGM_TEXT_PARSE (gst_ogm_text_parse_get_type())
#define GST_IS_OGM_TEXT_PARSE(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj), GST_TYPE_OGM_TEXT_PARSE))
#define GST_TYPE_OGM_PARSE (gst_ogm_parse_get_type())
#define GST_OGM_PARSE(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj), GST_TYPE_OGM_PARSE, GstOgmParse))
#define GST_OGM_PARSE_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass), GST_TYPE_OGM_PARSE, GstOgmParse))
#define GST_IS_OGM_PARSE(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj), GST_TYPE_OGM_PARSE))
#define GST_IS_OGM_PARSE_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass), GST_TYPE_OGM_PARSE))
#define GST_OGM_PARSE_GET_CLASS(obj) \
(G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_OGM_PARSE, GstOgmParseClass))
typedef struct _stream_header_video
{
gint32 width;
gint32 height;
} stream_header_video;
typedef struct _stream_header_audio
{
gint16 channels;
gint16 blockalign;
gint32 avgbytespersec;
} stream_header_audio;
/* sizeof(stream_header) might differ due to structure packing and
* alignment differences on some architectures, so not using that */
#define OGM_STREAM_HEADER_SIZE (8+4+4+8+8+4+4+4+8)
typedef struct _stream_header
{
gchar streamtype[8];
gchar subtype[4 + 1];
/* size of the structure */
gint32 size;
/* in reference time */
gint64 time_unit;
gint64 samples_per_unit;
/* in media time */
gint32 default_len;
gint32 buffersize;
gint32 bits_per_sample;
union
{
stream_header_video video;
stream_header_audio audio;
/* text has no additional data */
} s;
} stream_header;
typedef struct _GstOgmParse
{
GstElement element;
/* pads */
GstPad *srcpad, *sinkpad;
GstPadTemplate *srcpadtempl;
/* we need to cache events that we receive before creating the source pad */
GList *cached_events;
/* audio or video */
stream_header hdr;
/* expected next granulepos (used for timestamp guessing) */
guint64 next_granulepos;
} GstOgmParse;
typedef struct _GstOgmParseClass
{
GstElementClass parent_class;
} GstOgmParseClass;
static GstStaticPadTemplate sink_factory_video =
GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-ogm-video"));
static GstStaticPadTemplate sink_factory_audio =
GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-ogm-audio"));
static GstStaticPadTemplate sink_factory_text =
GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-ogm-text"));
static GstPadTemplate *video_src_templ, *audio_src_templ, *text_src_templ;
static GType gst_ogm_audio_parse_get_type (void);
static GType gst_ogm_video_parse_get_type (void);
static GType gst_ogm_text_parse_get_type (void);
static GType gst_ogm_parse_get_type (void);
static void gst_ogm_audio_parse_base_init (GstOgmParseClass * klass);
static void gst_ogm_video_parse_base_init (GstOgmParseClass * klass);
static void gst_ogm_text_parse_base_init (GstOgmParseClass * klass);
static void gst_ogm_parse_class_init (GstOgmParseClass * klass);
static void gst_ogm_parse_init (GstOgmParse * ogm);
static void gst_ogm_video_parse_init (GstOgmParse * ogm);
static void gst_ogm_audio_parse_init (GstOgmParse * ogm);
static void gst_ogm_text_parse_init (GstOgmParse * ogm);
static gboolean gst_ogm_parse_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_ogm_parse_sink_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static gboolean gst_ogm_parse_sink_convert (GstPad * pad, GstFormat src_format,
gint64 src_value, GstFormat * dest_format, gint64 * dest_value);
static GstFlowReturn gst_ogm_parse_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer);
static GstStateChangeReturn gst_ogm_parse_change_state (GstElement * element,
GstStateChange transition);
static GstElementClass *parent_class = NULL;
static GType
gst_ogm_parse_get_type (void)
{
static GType ogm_parse_type = 0;
if (!ogm_parse_type) {
static const GTypeInfo ogm_parse_info = {
sizeof (GstOgmParseClass),
NULL,
NULL,
(GClassInitFunc) gst_ogm_parse_class_init,
NULL,
NULL,
sizeof (GstOgmParse),
0,
(GInstanceInitFunc) gst_ogm_parse_init,
};
ogm_parse_type =
g_type_register_static (GST_TYPE_ELEMENT,
"GstOgmParse", &ogm_parse_info, 0);
}
return ogm_parse_type;
}
static GType
gst_ogm_audio_parse_get_type (void)
{
static GType ogm_audio_parse_type = 0;
if (!ogm_audio_parse_type) {
static const GTypeInfo ogm_audio_parse_info = {
sizeof (GstOgmParseClass),
(GBaseInitFunc) gst_ogm_audio_parse_base_init,
NULL,
NULL,
NULL,
NULL,
sizeof (GstOgmParse),
0,
(GInstanceInitFunc) gst_ogm_audio_parse_init,
};
ogm_audio_parse_type =
g_type_register_static (GST_TYPE_OGM_PARSE,
"GstOgmAudioParse", &ogm_audio_parse_info, 0);
}
return ogm_audio_parse_type;
}
static GType
gst_ogm_video_parse_get_type (void)
{
static GType ogm_video_parse_type = 0;
if (!ogm_video_parse_type) {
static const GTypeInfo ogm_video_parse_info = {
sizeof (GstOgmParseClass),
(GBaseInitFunc) gst_ogm_video_parse_base_init,
NULL,
NULL,
NULL,
NULL,
sizeof (GstOgmParse),
0,
(GInstanceInitFunc) gst_ogm_video_parse_init,
};
ogm_video_parse_type =
g_type_register_static (GST_TYPE_OGM_PARSE,
"GstOgmVideoParse", &ogm_video_parse_info, 0);
}
return ogm_video_parse_type;
}
static GType
gst_ogm_text_parse_get_type (void)
{
static GType ogm_text_parse_type = 0;
if (!ogm_text_parse_type) {
static const GTypeInfo ogm_text_parse_info = {
sizeof (GstOgmParseClass),
(GBaseInitFunc) gst_ogm_text_parse_base_init,
NULL,
NULL,
NULL,
NULL,
sizeof (GstOgmParse),
0,
(GInstanceInitFunc) gst_ogm_text_parse_init,
};
ogm_text_parse_type =
g_type_register_static (GST_TYPE_OGM_PARSE,
"GstOgmTextParse", &ogm_text_parse_info, 0);
}
return ogm_text_parse_type;
}
static void
gst_ogm_audio_parse_base_init (GstOgmParseClass * klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstCaps *caps = gst_riff_create_audio_template_caps ();
gst_element_class_set_static_metadata (element_class,
"OGM audio stream parser", "Codec/Decoder/Audio",
"parse an OGM audio header and stream",
"GStreamer maintainers <gstreamer-devel@lists.sourceforge.net>");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_factory_audio));
audio_src_templ = gst_pad_template_new ("src",
GST_PAD_SRC, GST_PAD_SOMETIMES, caps);
gst_element_class_add_pad_template (element_class, audio_src_templ);
gst_caps_unref (caps);
}
static void
gst_ogm_video_parse_base_init (GstOgmParseClass * klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstCaps *caps = gst_riff_create_video_template_caps ();
gst_element_class_set_static_metadata (element_class,
"OGM video stream parser", "Codec/Decoder/Video",
"parse an OGM video header and stream",
"GStreamer maintainers <gstreamer-devel@lists.sourceforge.net>");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_factory_video));
video_src_templ = gst_pad_template_new ("src",
GST_PAD_SRC, GST_PAD_SOMETIMES, caps);
gst_element_class_add_pad_template (element_class, video_src_templ);
gst_caps_unref (caps);
}
static void
gst_ogm_text_parse_base_init (GstOgmParseClass * klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstCaps *caps = gst_caps_new_simple ("text/x-raw", "format", G_TYPE_STRING,
"utf8", NULL);
gst_element_class_set_static_metadata (element_class,
"OGM text stream parser", "Codec/Decoder/Subtitle",
"parse an OGM text header and stream",
"GStreamer maintainers <gstreamer-devel@lists.sourceforge.net>");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_factory_text));
text_src_templ = gst_pad_template_new ("src",
GST_PAD_SRC, GST_PAD_SOMETIMES, caps);
gst_element_class_add_pad_template (element_class, text_src_templ);
gst_caps_unref (caps);
}
static void
gst_ogm_parse_class_init (GstOgmParseClass * klass)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_ogm_parse_change_state);
}
static void
gst_ogm_parse_init (GstOgmParse * ogm)
{
memset (&ogm->hdr, 0, sizeof (ogm->hdr));
ogm->next_granulepos = 0;
ogm->srcpad = NULL;
ogm->cached_events = NULL;
}
static void
gst_ogm_audio_parse_init (GstOgmParse * ogm)
{
ogm->sinkpad = gst_pad_new_from_static_template (&sink_factory_audio, "sink");
gst_pad_set_query_function (ogm->sinkpad,
GST_DEBUG_FUNCPTR (gst_ogm_parse_sink_query));
gst_pad_set_chain_function (ogm->sinkpad,
GST_DEBUG_FUNCPTR (gst_ogm_parse_chain));
gst_pad_set_event_function (ogm->sinkpad,
GST_DEBUG_FUNCPTR (gst_ogm_parse_sink_event));
gst_element_add_pad (GST_ELEMENT (ogm), ogm->sinkpad);
ogm->srcpad = NULL;
ogm->srcpadtempl = audio_src_templ;
}
static void
gst_ogm_video_parse_init (GstOgmParse * ogm)
{
ogm->sinkpad = gst_pad_new_from_static_template (&sink_factory_video, "sink");
gst_pad_set_query_function (ogm->sinkpad,
GST_DEBUG_FUNCPTR (gst_ogm_parse_sink_query));
gst_pad_set_chain_function (ogm->sinkpad,
GST_DEBUG_FUNCPTR (gst_ogm_parse_chain));
gst_pad_set_event_function (ogm->sinkpad,
GST_DEBUG_FUNCPTR (gst_ogm_parse_sink_event));
gst_element_add_pad (GST_ELEMENT (ogm), ogm->sinkpad);
ogm->srcpad = NULL;
ogm->srcpadtempl = video_src_templ;
}
static void
gst_ogm_text_parse_init (GstOgmParse * ogm)
{
ogm->sinkpad = gst_pad_new_from_static_template (&sink_factory_text, "sink");
gst_pad_set_query_function (ogm->sinkpad,
GST_DEBUG_FUNCPTR (gst_ogm_parse_sink_query));
gst_pad_set_chain_function (ogm->sinkpad,
GST_DEBUG_FUNCPTR (gst_ogm_parse_chain));
gst_pad_set_event_function (ogm->sinkpad,
GST_DEBUG_FUNCPTR (gst_ogm_parse_sink_event));
gst_element_add_pad (GST_ELEMENT (ogm), ogm->sinkpad);
ogm->srcpad = NULL;
ogm->srcpadtempl = text_src_templ;
}
static gboolean
gst_ogm_parse_sink_convert (GstPad * pad,
GstFormat src_format, gint64 src_value,
GstFormat * dest_format, gint64 * dest_value)
{
gboolean res = FALSE;
GstOgmParse *ogm = GST_OGM_PARSE (gst_pad_get_parent (pad));
switch (src_format) {
case GST_FORMAT_DEFAULT:
switch (*dest_format) {
case GST_FORMAT_TIME:
switch (ogm->hdr.streamtype[0]) {
case 'a':
*dest_value = GST_SECOND * src_value / ogm->hdr.samples_per_unit;
res = TRUE;
break;
case 'v':
case 't':
*dest_value = (GST_SECOND / 10000000) *
ogm->hdr.time_unit * src_value;
res = TRUE;
break;
default:
break;
}
break;
default:
break;
}
break;
case GST_FORMAT_TIME:
switch (*dest_format) {
case GST_FORMAT_DEFAULT:
switch (ogm->hdr.streamtype[0]) {
case 'a':
*dest_value = ogm->hdr.samples_per_unit * src_value / GST_SECOND;
res = TRUE;
break;
case 'v':
case 't':
*dest_value = src_value /
((GST_SECOND / 10000000) * ogm->hdr.time_unit);
res = TRUE;
break;
default:
break;
}
break;
default:
break;
}
break;
default:
break;
}
gst_object_unref (ogm);
return res;
}
static gboolean
gst_ogm_parse_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
GstOgmParse *ogm = GST_OGM_PARSE (parent);
GstFormat format;
gboolean res = FALSE;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_POSITION:
{
gint64 val;
gst_query_parse_position (query, &format, NULL);
if (format != GST_FORMAT_DEFAULT && format != GST_FORMAT_TIME)
break;
if ((res = gst_ogm_parse_sink_convert (pad,
GST_FORMAT_DEFAULT, ogm->next_granulepos, &format, &val))) {
/* don't know the total length here.. */
gst_query_set_position (query, format, val);
}
break;
}
case GST_QUERY_CONVERT:
{
GstFormat src_fmt, dest_fmt;
gint64 src_val, dest_val;
/* peel off input */
gst_query_parse_convert (query, &src_fmt, &src_val, &dest_fmt, &dest_val);
if ((res = gst_ogm_parse_sink_convert (pad, src_fmt, src_val,
&dest_fmt, &dest_val))) {
gst_query_set_convert (query, src_fmt, src_val, dest_fmt, dest_val);
}
break;
}
default:
res = gst_pad_query_default (pad, parent, query);
break;
}
return res;
}
static GstFlowReturn
gst_ogm_parse_stream_header (GstOgmParse * ogm, const guint8 * data, guint size)
{
GstCaps *caps = NULL;
/* stream header */
if (size < OGM_STREAM_HEADER_SIZE)
goto buffer_too_small;
if (!memcmp (data, "video\000\000\000", 8)) {
ogm->hdr.s.video.width = GST_READ_UINT32_LE (&data[44]);
ogm->hdr.s.video.height = GST_READ_UINT32_LE (&data[48]);
} else if (!memcmp (data, "audio\000\000\000", 8)) {
ogm->hdr.s.audio.channels = GST_READ_UINT32_LE (&data[44]);
ogm->hdr.s.audio.blockalign = GST_READ_UINT32_LE (&data[46]);
ogm->hdr.s.audio.avgbytespersec = GST_READ_UINT32_LE (&data[48]);
} else if (!memcmp (data, "text\000\000\000\000", 8)) {
/* nothing here */
} else {
goto cannot_decode;
}
memcpy (ogm->hdr.streamtype, &data[0], 8);
memcpy (ogm->hdr.subtype, &data[8], 4);
ogm->hdr.subtype[4] = '\0';
ogm->hdr.size = GST_READ_UINT32_LE (&data[12]);
ogm->hdr.time_unit = GST_READ_UINT64_LE (&data[16]);
ogm->hdr.samples_per_unit = GST_READ_UINT64_LE (&data[24]);
ogm->hdr.default_len = GST_READ_UINT32_LE (&data[32]);
ogm->hdr.buffersize = GST_READ_UINT32_LE (&data[36]);
ogm->hdr.bits_per_sample = GST_READ_UINT32_LE (&data[40]);
switch (ogm->hdr.streamtype[0]) {
case 'a':{
guint codec_id = 0;
if (sscanf (ogm->hdr.subtype, "%04x", &codec_id) != 1) {
GST_WARNING_OBJECT (ogm, "cannot parse subtype %s", ogm->hdr.subtype);
}
/* FIXME: Need to do something with the reorder map */
caps =
gst_riff_create_audio_caps (codec_id, NULL, NULL, NULL, NULL, NULL,
NULL);
if (caps == NULL) {
GST_WARNING_OBJECT (ogm, "no audio caps for codec %u found", codec_id);
caps = gst_caps_new_simple ("audio/x-ogm-unknown", "codec_id",
G_TYPE_INT, (gint) codec_id, NULL);
}
gst_caps_set_simple (caps,
"channels", G_TYPE_INT, ogm->hdr.s.audio.channels,
"rate", G_TYPE_INT, ogm->hdr.samples_per_unit, NULL);
GST_LOG_OBJECT (ogm, "Type: %s, subtype: 0x%04x, channels: %d, "
"samplerate: %d, blockalign: %d, bps: %d, caps = %" GST_PTR_FORMAT,
ogm->hdr.streamtype, codec_id, ogm->hdr.s.audio.channels,
(gint) ogm->hdr.samples_per_unit, ogm->hdr.s.audio.blockalign,
ogm->hdr.s.audio.avgbytespersec, caps);
break;
}
case 'v':{
guint32 fourcc;
gint time_unit;
fourcc = GST_MAKE_FOURCC (ogm->hdr.subtype[0],
ogm->hdr.subtype[1], ogm->hdr.subtype[2], ogm->hdr.subtype[3]);
caps = gst_riff_create_video_caps (fourcc, NULL, NULL, NULL, NULL, NULL);
if (caps == NULL) {
GST_WARNING_OBJECT (ogm, "could not find video caps for fourcc %"
GST_FOURCC_FORMAT, GST_FOURCC_ARGS (fourcc));
caps = gst_caps_new_simple ("video/x-ogm-unknown", "fourcc",
G_TYPE_STRING, ogm->hdr.subtype, NULL);
break;
}
GST_LOG_OBJECT (ogm, "Type: %s, subtype: %" GST_FOURCC_FORMAT
", size: %dx%d, timeunit: %" G_GINT64_FORMAT
" (fps: %lf), s/u: %" G_GINT64_FORMAT ", "
"def.len: %d, bufsize: %d, bps: %d, caps = %" GST_PTR_FORMAT,
ogm->hdr.streamtype, GST_FOURCC_ARGS (fourcc),
ogm->hdr.s.video.width, ogm->hdr.s.video.height,
ogm->hdr.time_unit, 10000000. / ogm->hdr.time_unit,
ogm->hdr.samples_per_unit, ogm->hdr.default_len,
ogm->hdr.buffersize, ogm->hdr.bits_per_sample, caps);
/* GST_TYPE_FRACTION contains gint */
if (ogm->hdr.time_unit > G_MAXINT || ogm->hdr.time_unit < G_MININT)
GST_WARNING_OBJECT (ogm, "timeunit is out of range");
time_unit = (gint) CLAMP (ogm->hdr.time_unit, G_MININT, G_MAXINT);
gst_caps_set_simple (caps,
"width", G_TYPE_INT, ogm->hdr.s.video.width,
"height", G_TYPE_INT, ogm->hdr.s.video.height,
"framerate", GST_TYPE_FRACTION, 10000000, time_unit, NULL);
break;
}
case 't':{
GST_LOG_OBJECT (ogm, "Type: %s, s/u: %" G_GINT64_FORMAT
", timeunit=%" G_GINT64_FORMAT,
ogm->hdr.streamtype, ogm->hdr.samples_per_unit, ogm->hdr.time_unit);
caps = gst_caps_new_simple ("text/x-raw", "format", G_TYPE_STRING,
"utf8", NULL);
break;
}
default:
g_assert_not_reached ();
}
if (caps == NULL)
goto cannot_decode;
if (ogm->srcpad) {
GstCaps *current_caps = gst_pad_get_current_caps (ogm->srcpad);
if (current_caps) {
if (caps && !gst_caps_is_equal (current_caps, caps)) {
GST_WARNING_OBJECT (ogm, "Already an existing pad %s:%s",
GST_DEBUG_PAD_NAME (ogm->srcpad));
gst_pad_set_active (ogm->srcpad, FALSE);
gst_element_remove_pad (GST_ELEMENT (ogm), ogm->srcpad);
ogm->srcpad = NULL;
} else {
GST_DEBUG_OBJECT (ogm, "Existing pad has the same caps, do nothing");
}
gst_caps_unref (current_caps);
}
}
if (ogm->srcpad == NULL) {
GList *l, *cached_events;
ogm->srcpad = gst_pad_new_from_template (ogm->srcpadtempl, "src");
gst_pad_use_fixed_caps (ogm->srcpad);
gst_pad_set_active (ogm->srcpad, TRUE);
gst_pad_set_caps (ogm->srcpad, caps);
gst_element_add_pad (GST_ELEMENT (ogm), ogm->srcpad);
GST_INFO_OBJECT (ogm, "Added pad %s:%s with caps %" GST_PTR_FORMAT,
GST_DEBUG_PAD_NAME (ogm->srcpad), caps);
GST_OBJECT_LOCK (ogm);
cached_events = ogm->cached_events;
ogm->cached_events = NULL;
GST_OBJECT_UNLOCK (ogm);
for (l = cached_events; l; l = l->next) {
GstEvent *event = GST_EVENT_CAST (l->data);
GST_DEBUG_OBJECT (ogm, "Pushing cached event %" GST_PTR_FORMAT, event);
gst_pad_push_event (ogm->srcpad, event);
}
g_list_free (cached_events);
{
GstTagList *tags;
tags = gst_tag_list_new (GST_TAG_SUBTITLE_CODEC, "Ogm", NULL);
gst_pad_push_event (ogm->srcpad, gst_event_new_tag (tags));
}
}
gst_caps_unref (caps);
return GST_FLOW_OK;
/* ERRORS */
buffer_too_small:
{
GST_ELEMENT_ERROR (ogm, STREAM, WRONG_TYPE, ("Buffer too small"), (NULL));
return GST_FLOW_ERROR;
}
cannot_decode:
{
GST_ELEMENT_ERROR (ogm, STREAM, DECODE, (NULL), ("unknown ogm format"));
return GST_FLOW_ERROR;
}
}
static GstFlowReturn
gst_ogm_parse_comment_packet (GstOgmParse * ogm, GstBuffer * buf)
{
GstFlowReturn ret;
if (ogm->srcpad == NULL) {
GST_DEBUG ("no source pad");
return GST_FLOW_FLUSHING;
}
/* if this is not a subtitle stream, push the vorbiscomment packet
* on downstream, the respective decoder will handle it; if it is
* a subtitle stream, we will have to handle the comment ourself */
if (ogm->hdr.streamtype[0] == 't') {
GstTagList *tags;
tags = gst_tag_list_from_vorbiscomment_buffer (buf,
(guint8 *) "\003vorbis", 7, NULL);
if (tags) {
GST_DEBUG_OBJECT (ogm, "tags = %" GST_PTR_FORMAT, tags);
gst_pad_push_event (ogm->srcpad, gst_event_new_tag (tags));
} else {
GST_DEBUG_OBJECT (ogm, "failed to extract tags from vorbis comment");
}
/* do not push packet downstream, just let parent unref it */
ret = GST_FLOW_OK;
} else {
ret = gst_pad_push (ogm->srcpad, buf);
}
return ret;
}
static void
gst_ogm_text_parse_strip_trailing_zeroes (GstOgmParse * ogm, GstBuffer * buf)
{
GstMapInfo map;
gsize size;
g_assert (gst_buffer_is_writable (buf));
/* zeroes are not valid UTF-8 characters, so strip them from output */
gst_buffer_map (buf, &map, GST_MAP_WRITE);
size = map.size;
while (size > 0 && map.data[size - 1] == '\0') {
--size;
}
gst_buffer_unmap (buf, &map);
}
static GstFlowReturn
gst_ogm_parse_data_packet (GstOgmParse * ogm, GstBuffer * buf,
const guint8 * data, gsize size)
{
GstFlowReturn ret;
GstBuffer *sbuf;
gboolean keyframe;
guint len, n, xsize = 0;
if ((data[0] & 0x01) != 0)
goto invalid_startcode;
/* data - push on */
len = ((data[0] & 0xc0) >> 6) | ((data[0] & 0x02) << 1);
keyframe = (((data[0] & 0x08) >> 3) != 0);
if ((1 + len) > size)
goto buffer_too_small;
for (n = len; n > 0; n--) {
xsize = (xsize << 8) | data[n];
}
GST_LOG_OBJECT (ogm, "[0x%02x] samples: %d, hdrbytes: %d, datasize: %"
G_GSIZE_FORMAT, data[0], xsize, len, size - len - 1);
sbuf =
gst_buffer_copy_region (buf, GST_BUFFER_COPY_ALL, len + 1,
size - len - 1);
if (GST_BUFFER_OFFSET_END_IS_VALID (buf))
ogm->next_granulepos = GST_BUFFER_OFFSET_END (buf);
switch (ogm->hdr.streamtype[0]) {
case 't':
case 'v':{
GstClockTime ts, next_ts;
guint samples;
samples = (ogm->hdr.streamtype[0] == 'v') ? 1 : xsize;
if (!keyframe) {
GST_BUFFER_FLAG_SET (sbuf, GST_BUFFER_FLAG_DELTA_UNIT);
}
/* shouldn't this be granulepos - samples? (tpm) */
ts = gst_util_uint64_scale (ogm->next_granulepos,
ogm->hdr.time_unit * GST_SECOND, 10000000);
next_ts = gst_util_uint64_scale (ogm->next_granulepos + samples,
ogm->hdr.time_unit * GST_SECOND, 10000000);
GST_BUFFER_TIMESTAMP (sbuf) = ts;
GST_BUFFER_DURATION (sbuf) = next_ts - ts;
ogm->next_granulepos += samples;
if (ogm->hdr.streamtype[0] == 't') {
gst_ogm_text_parse_strip_trailing_zeroes (ogm, sbuf);
}
break;
}
case 'a':{
GstClockTime ts, next_ts;
/* shouldn't this be granulepos - samples? (tpm) */
ts = gst_util_uint64_scale_int (ogm->next_granulepos,
GST_SECOND, ogm->hdr.samples_per_unit);
next_ts = gst_util_uint64_scale_int (ogm->next_granulepos + xsize,
GST_SECOND, ogm->hdr.samples_per_unit);
GST_BUFFER_TIMESTAMP (sbuf) = ts;
GST_BUFFER_DURATION (sbuf) = next_ts - ts;
ogm->next_granulepos += xsize;
break;
}
default:
g_assert_not_reached ();
break;
}
if (ogm->srcpad) {
GST_LOG_OBJECT (ogm, "Pushing buffer with ts=%" GST_TIME_FORMAT,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (sbuf)));
ret = gst_pad_push (ogm->srcpad, sbuf);
if (ret != GST_FLOW_OK) {
GST_DEBUG_OBJECT (ogm, "Flow on %s:%s = %s",
GST_DEBUG_PAD_NAME (ogm->srcpad), gst_flow_get_name (ret));
}
} else {
ret = GST_FLOW_FLUSHING;
}
return ret;
/* ERRORS */
invalid_startcode:
{
GST_ELEMENT_ERROR (ogm, STREAM, DECODE, (NULL),
("unexpected packet startcode 0x%02x", data[0]));
return GST_FLOW_ERROR;
}
buffer_too_small:
{
GST_ELEMENT_ERROR (ogm, STREAM, DECODE, (NULL),
("buffer too small, len+1=%u, size=%" G_GSIZE_FORMAT, len + 1, size));
return GST_FLOW_ERROR;
}
}
static GstFlowReturn
gst_ogm_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstFlowReturn ret = GST_FLOW_OK;
GstOgmParse *ogm = GST_OGM_PARSE (parent);
GstMapInfo map;
gst_buffer_map (buf, &map, GST_MAP_READ);
if (map.size < 1)
goto buffer_too_small;
GST_LOG_OBJECT (ogm, "Packet with start code 0x%02x", map.data[0]);
switch (map.data[0]) {
case 0x01:{
ret = gst_ogm_parse_stream_header (ogm, map.data + 1, map.size - 1);
break;
}
case 0x03:{
ret = gst_ogm_parse_comment_packet (ogm, buf);
break;
}
default:{
ret = gst_ogm_parse_data_packet (ogm, buf, map.data, map.size);
break;
}
}
gst_buffer_unmap (buf, &map);
gst_buffer_unref (buf);
if (ret != GST_FLOW_OK) {
GST_DEBUG_OBJECT (ogm, "Flow: %s", gst_flow_get_name (ret));
}
return ret;
/* ERRORS */
buffer_too_small:
{
GST_ELEMENT_ERROR (ogm, STREAM, DECODE, (NULL), ("buffer too small"));
gst_buffer_unmap (buf, &map);
gst_buffer_unref (buf);
return GST_FLOW_ERROR;
}
}
static gboolean
gst_ogm_parse_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstOgmParse *ogm = GST_OGM_PARSE (parent);
gboolean res;
GST_LOG_OBJECT (ogm, "processing %s event", GST_EVENT_TYPE_NAME (event));
GST_OBJECT_LOCK (ogm);
if (ogm->srcpad == NULL) {
ogm->cached_events = g_list_append (ogm->cached_events, event);
GST_OBJECT_UNLOCK (ogm);
res = TRUE;
} else {
GST_OBJECT_UNLOCK (ogm);
res = gst_pad_event_default (pad, parent, event);
}
return res;
}
static GstStateChangeReturn
gst_ogm_parse_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret;
GstOgmParse *ogm = GST_OGM_PARSE (element);
ret = parent_class->change_state (element, transition);
if (ret != GST_STATE_CHANGE_SUCCESS)
return ret;
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
if (ogm->srcpad) {
gst_pad_set_active (ogm->srcpad, FALSE);
gst_element_remove_pad (element, ogm->srcpad);
ogm->srcpad = NULL;
}
memset (&ogm->hdr, 0, sizeof (ogm->hdr));
ogm->next_granulepos = 0;
g_list_foreach (ogm->cached_events, (GFunc) gst_mini_object_unref, NULL);
g_list_free (ogm->cached_events);
ogm->cached_events = NULL;
break;
default:
break;
}
return ret;
}
gboolean
gst_ogm_parse_plugin_init (GstPlugin * plugin)
{
gst_riff_init ();
GST_DEBUG_CATEGORY_INIT (gst_ogm_parse_debug, "ogmparse", 0, "ogm parser");
return gst_element_register (plugin, "ogmaudioparse", GST_RANK_PRIMARY,
GST_TYPE_OGM_AUDIO_PARSE) &&
gst_element_register (plugin, "ogmvideoparse", GST_RANK_PRIMARY,
GST_TYPE_OGM_VIDEO_PARSE) &&
gst_element_register (plugin, "ogmtextparse", GST_RANK_PRIMARY,
GST_TYPE_OGM_TEXT_PARSE);
}
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