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gstreamer/subprojects/gst-plugins-bad/gst/jpegformat/gstjifmux.c

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/* GStreamer
*
* jifmux: JPEG interchange format muxer
*
* Copyright (C) 2010 Stefan Kost <stefan.kost@nokia.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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.
*/
/**
* SECTION:element-jifmux
* @title: jifmux
* @short_description: JPEG interchange format writer
*
* Writes a JPEG image as JPEG/EXIF or JPEG/JFIF including various metadata. The
* jpeg image received on the sink pad should be minimal (e.g. should not
* contain metadata already).
*
* ## Example launch line
* |[
* gst-launch-1.0 -v videotestsrc num-buffers=1 ! jpegenc ! jifmux ! filesink location=...
* ]|
* The above pipeline renders a frame, encodes to jpeg, adds metadata and writes
* it to disk.
*
*/
/*
jpeg interchange format:
file header : SOI, APPn{JFIF,EXIF,...}
frame header: DQT, SOF
scan header : {DAC,DHT},DRI,SOS
<scan data>
file trailer: EOI
tests:
gst-launch-1.0 videotestsrc num-buffers=1 ! jpegenc ! jifmux ! filesink location=test1.jpeg
gst-launch-1.0 videotestsrc num-buffers=1 ! jpegenc ! taginject tags="comment=test image" ! jifmux ! filesink location=test2.jpeg
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <string.h>
#include <gst/base/gstbytereader.h>
#include <gst/base/gstbytewriter.h>
#include <gst/codecparsers/gstjpegparser.h>
#include <gst/tag/tag.h>
#include <gst/tag/xmpwriter.h>
#include "gstjifmux.h"
static GstStaticPadTemplate gst_jif_mux_src_pad_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("image/jpeg")
);
static GstStaticPadTemplate gst_jif_mux_sink_pad_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("image/jpeg")
);
GST_DEBUG_CATEGORY_STATIC (jif_mux_debug);
#define GST_CAT_DEFAULT jif_mux_debug
#define COLORSPACE_UNKNOWN (0 << 0)
#define COLORSPACE_GRAYSCALE (1 << 0)
#define COLORSPACE_YUV (1 << 1)
#define COLORSPACE_RGB (1 << 2)
#define COLORSPACE_CMYK (1 << 3)
#define COLORSPACE_YCCK (1 << 4)
typedef struct _GstJifMuxMarker
{
guint8 marker;
guint16 size;
const guint8 *data;
gboolean owned;
} GstJifMuxMarker;
static void gst_jif_mux_finalize (GObject * object);
static void gst_jif_mux_reset (GstJifMux * self);
static gboolean gst_jif_mux_sink_setcaps (GstJifMux * self, GstCaps * caps);
static gboolean gst_jif_mux_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static GstFlowReturn gst_jif_mux_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer);
static GstStateChangeReturn gst_jif_mux_change_state (GstElement * element,
GstStateChange transition);
#define gst_jif_mux_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstJifMux, gst_jif_mux, GST_TYPE_ELEMENT,
G_IMPLEMENT_INTERFACE (GST_TYPE_TAG_SETTER, NULL);
G_IMPLEMENT_INTERFACE (GST_TYPE_TAG_XMP_WRITER, NULL));
GST_ELEMENT_REGISTER_DEFINE (jifmux, "jifmux", GST_RANK_SECONDARY,
GST_TYPE_JIF_MUX);
static void
gst_jif_mux_class_init (GstJifMuxClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gobject_class->finalize = gst_jif_mux_finalize;
gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_jif_mux_change_state);
gst_element_class_add_static_pad_template (gstelement_class,
&gst_jif_mux_src_pad_template);
gst_element_class_add_static_pad_template (gstelement_class,
&gst_jif_mux_sink_pad_template);
gst_element_class_set_static_metadata (gstelement_class,
"JPEG stream muxer",
"Video/Formatter",
"Remuxes JPEG images with markers and tags",
"Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>");
GST_DEBUG_CATEGORY_INIT (jif_mux_debug, "jifmux", 0,
"JPEG interchange format muxer");
}
static void
gst_jif_mux_init (GstJifMux * self)
{
GstPad *sinkpad;
/* create the sink and src pads */
sinkpad = gst_pad_new_from_static_template (&gst_jif_mux_sink_pad_template,
"sink");
gst_pad_set_chain_function (sinkpad, GST_DEBUG_FUNCPTR (gst_jif_mux_chain));
gst_pad_set_event_function (sinkpad,
GST_DEBUG_FUNCPTR (gst_jif_mux_sink_event));
gst_element_add_pad (GST_ELEMENT (self), sinkpad);
self->srcpad =
gst_pad_new_from_static_template (&gst_jif_mux_src_pad_template, "src");
gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
}
static void
gst_jif_mux_finalize (GObject * object)
{
GstJifMux *self = GST_JIF_MUX (object);
gst_jif_mux_reset (self);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_jif_mux_sink_setcaps (GstJifMux * self, GstCaps * caps)
{
GstStructure *s = gst_caps_get_structure (caps, 0);
const gchar *variant;
/* should be {combined (default), EXIF, JFIF} */
if ((variant = gst_structure_get_string (s, "variant")) != NULL) {
GST_INFO_OBJECT (self, "muxing to '%s'", variant);
/* FIXME: do we want to switch it like this or use a gobject property ? */
}
return gst_pad_set_caps (self->srcpad, caps);
}
static gboolean
gst_jif_mux_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstJifMux *self = GST_JIF_MUX (parent);
gboolean ret;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
ret = gst_jif_mux_sink_setcaps (self, caps);
gst_event_unref (event);
break;
}
case GST_EVENT_TAG:{
GstTagList *list;
GstTagSetter *setter = GST_TAG_SETTER (self);
const GstTagMergeMode mode = gst_tag_setter_get_tag_merge_mode (setter);
gst_event_parse_tag (event, &list);
gst_tag_setter_merge_tags (setter, list, mode);
ret = gst_pad_event_default (pad, parent, event);
break;
}
default:
ret = gst_pad_event_default (pad, parent, event);
break;
}
return ret;
}
static void
gst_jif_mux_marker_free (GstJifMuxMarker * m)
{
if (m->owned)
g_free ((gpointer) m->data);
g_free (m);
}
static void
gst_jif_mux_reset (GstJifMux * self)
{
GList *node;
GstJifMuxMarker *m;
for (node = self->markers; node; node = g_list_next (node)) {
m = (GstJifMuxMarker *) node->data;
gst_jif_mux_marker_free (m);
}
g_list_free (self->markers);
self->markers = NULL;
}
static GstJifMuxMarker *
gst_jif_mux_new_marker (guint8 marker, guint16 size, const guint8 * data,
gboolean owned)
{
GstJifMuxMarker *m = g_new (GstJifMuxMarker, 1);
m->marker = marker;
m->size = size;
m->data = data;
m->owned = owned;
return m;
}
static gboolean
gst_jif_mux_parse_image (GstJifMux * self, GstBuffer * buf)
{
GstByteReader reader;
GstJifMuxMarker *m;
guint8 marker = 0;
guint16 size = 0;
const guint8 *data = NULL;
GstMapInfo map;
gst_buffer_map (buf, &map, GST_MAP_READ);
gst_byte_reader_init (&reader, map.data, map.size);
GST_LOG_OBJECT (self, "Received buffer of size: %" G_GSIZE_FORMAT, map.size);
if (!gst_byte_reader_peek_uint8 (&reader, &marker))
goto error;
while (marker == 0xff) {
if (!gst_byte_reader_skip (&reader, 1))
goto error;
if (!gst_byte_reader_get_uint8 (&reader, &marker))
goto error;
switch (marker) {
case GST_JPEG_MARKER_RST0:
case GST_JPEG_MARKER_RST1:
case GST_JPEG_MARKER_RST2:
case GST_JPEG_MARKER_RST3:
case GST_JPEG_MARKER_RST4:
case GST_JPEG_MARKER_RST5:
case GST_JPEG_MARKER_RST6:
case GST_JPEG_MARKER_RST7:
case GST_JPEG_MARKER_SOI:
GST_DEBUG_OBJECT (self, "marker = %x", marker);
m = gst_jif_mux_new_marker (marker, 0, NULL, FALSE);
self->markers = g_list_prepend (self->markers, m);
break;
case GST_JPEG_MARKER_EOI:
GST_DEBUG_OBJECT (self, "marker = %x", marker);
m = gst_jif_mux_new_marker (marker, 0, NULL, FALSE);
self->markers = g_list_prepend (self->markers, m);
goto done;
default:
if (!gst_byte_reader_get_uint16_be (&reader, &size))
goto error;
if (!gst_byte_reader_get_data (&reader, size - 2, &data))
goto error;
m = gst_jif_mux_new_marker (marker, size - 2, data, FALSE);
self->markers = g_list_prepend (self->markers, m);
GST_DEBUG_OBJECT (self, "marker = %2x, size = %u", marker, size);
break;
}
if (marker == GST_JPEG_MARKER_SOS) {
gint eoi_pos = -1;
gint i;
/* search the last 5 bytes for the EOI marker */
g_assert (map.size >= 5);
for (i = 5; i >= 2; i--) {
if (map.data[map.size - i] == 0xFF
&& map.data[map.size - i + 1] == GST_JPEG_MARKER_EOI) {
eoi_pos = map.size - i;
break;
}
}
if (eoi_pos == -1) {
GST_WARNING_OBJECT (self, "Couldn't find an EOI marker");
eoi_pos = map.size;
}
/* remaining size except EOI is scan data */
self->scan_size = eoi_pos - gst_byte_reader_get_pos (&reader);
if (!gst_byte_reader_get_data (&reader, self->scan_size,
&self->scan_data))
goto error;
GST_DEBUG_OBJECT (self, "scan data, size = %u", self->scan_size);
}
if (!gst_byte_reader_peek_uint8 (&reader, &marker))
goto error;
}
GST_INFO_OBJECT (self, "done parsing at 0x%x / 0x%x",
gst_byte_reader_get_pos (&reader), (guint) map.size);
done:
self->markers = g_list_reverse (self->markers);
gst_buffer_unmap (buf, &map);
return TRUE;
/* ERRORS */
error:
{
GST_WARNING_OBJECT (self,
"Error parsing image header (need more that %u bytes available)",
gst_byte_reader_get_remaining (&reader));
gst_buffer_unmap (buf, &map);
return FALSE;
}
}
static gboolean
gst_jif_mux_mangle_markers (GstJifMux * self)
{
gboolean modified = FALSE;
GstTagList *tags = NULL;
gboolean cleanup_tags;
GstJifMuxMarker *m;
GList *node, *file_hdr = NULL, *frame_hdr = NULL, *scan_hdr = NULL;
GList *app0_jfif = NULL, *app1_exif = NULL, *app1_xmp = NULL, *com = NULL;
GstBuffer *xmp_data;
gchar *str = NULL;
gint colorspace = COLORSPACE_UNKNOWN;
/* update the APP markers
* - put any JFIF APP0 first
* - the Exif APP1 next,
* - the XMP APP1 next,
* - the PSIR APP13 next,
* - followed by all other marker segments
*/
/* find some reference points where we insert before/after */
file_hdr = self->markers;
for (node = self->markers; node; node = g_list_next (node)) {
m = (GstJifMuxMarker *) node->data;
switch (m->marker) {
case GST_JPEG_MARKER_APP0:
if (m->size > 5 && !memcmp (m->data, "JFIF\0", 5)) {
GST_DEBUG_OBJECT (self, "found APP0 JFIF");
colorspace |= COLORSPACE_GRAYSCALE | COLORSPACE_YUV;
if (!app0_jfif)
app0_jfif = node;
}
break;
case GST_JPEG_MARKER_APP1:
if (m->size > 6 && (!memcmp (m->data, "EXIF\0\0", 6) ||
!memcmp (m->data, "Exif\0\0", 6))) {
GST_DEBUG_OBJECT (self, "found APP1 EXIF");
if (!app1_exif)
app1_exif = node;
} else if (m->size > 29
&& !memcmp (m->data, "http://ns.adobe.com/xap/1.0/\0", 29)) {
GST_INFO_OBJECT (self, "found APP1 XMP, will be replaced");
if (!app1_xmp)
app1_xmp = node;
}
break;
case GST_JPEG_MARKER_APP14:
/* check if this contains RGB */
/*
* This marker should have:
* - 'Adobe\0'
* - 2 bytes DCTEncodeVersion
* - 2 bytes flags0
* - 2 bytes flags1
* - 1 byte ColorTransform
* - 0 means unknown (RGB or CMYK)
* - 1 YCbCr
* - 2 YCCK
*/
if ((m->size >= 14)
&& (strncmp ((gchar *) m->data, "Adobe\0", 6) == 0)) {
switch (m->data[11]) {
case 0:
colorspace |= COLORSPACE_RGB | COLORSPACE_CMYK;
break;
case 1:
colorspace |= COLORSPACE_YUV;
break;
case 2:
colorspace |= COLORSPACE_YCCK;
break;
default:
break;
}
}
break;
case GST_JPEG_MARKER_COM:
GST_INFO_OBJECT (self, "found COM, will be replaced");
if (!com)
com = node;
break;
case GST_JPEG_MARKER_DQT:
case GST_JPEG_MARKER_SOF0:
case GST_JPEG_MARKER_SOF1:
case GST_JPEG_MARKER_SOF2:
case GST_JPEG_MARKER_SOF3:
case GST_JPEG_MARKER_SOF5:
case GST_JPEG_MARKER_SOF6:
case GST_JPEG_MARKER_SOF7:
case GST_JPEG_MARKER_SOF9:
case GST_JPEG_MARKER_SOF10:
case GST_JPEG_MARKER_SOF11:
case GST_JPEG_MARKER_SOF13:
case GST_JPEG_MARKER_SOF14:
case GST_JPEG_MARKER_SOF15:
if (!frame_hdr)
frame_hdr = node;
break;
case GST_JPEG_MARKER_DAC:
case GST_JPEG_MARKER_DHT:
case GST_JPEG_MARKER_DRI:
case GST_JPEG_MARKER_SOS:
if (!scan_hdr)
scan_hdr = node;
break;
}
}
/* if we want combined or JFIF */
/* check if we don't have JFIF APP0 */
if (!app0_jfif && (colorspace & (COLORSPACE_GRAYSCALE | COLORSPACE_YUV))) {
/* build jfif header */
/* *INDENT-OFF* */
static const struct
{
gchar id[5];
guint8 ver[2];
guint8 du;
guint8 xd[2], yd[2];
guint8 tw, th;
} jfif_data = { "JFIF",
{ 1, 2 },
0,
{ 0, 1 }, /* FIXME: check pixel-aspect from caps */
{ 0, 1 },
0, 0
};
/* *INDENT-ON* */
m = gst_jif_mux_new_marker (GST_JPEG_MARKER_APP0, sizeof (jfif_data),
(const guint8 *) &jfif_data, FALSE);
/* insert into self->markers list */
self->markers = g_list_insert (self->markers, m, 1);
app0_jfif = g_list_nth (self->markers, 1);
}
/* else */
/* remove JFIF if exists */
/* Existing exif tags will be removed and our own will be added */
if (!tags) {
tags = (GstTagList *) gst_tag_setter_get_tag_list (GST_TAG_SETTER (self));
cleanup_tags = FALSE;
}
if (!tags) {
tags = gst_tag_list_new_empty ();
cleanup_tags = TRUE;
}
GST_DEBUG_OBJECT (self, "Tags to be serialized %" GST_PTR_FORMAT, tags);
/* FIXME: not happy with those
* - else where we would use VIDEO_CODEC = "Jpeg"
gst_tag_list_add (tags, GST_TAG_MERGE_REPLACE,
GST_TAG_VIDEO_CODEC, "image/jpeg", NULL);
*/
/* Add EXIF */
{
GstBuffer *exif_data;
gsize exif_size;
guint8 *data;
GstJifMuxMarker *m;
GList *pos;
/* insert into self->markers list */
exif_data = gst_tag_list_to_exif_buffer_with_tiff_header (tags);
exif_size = exif_data ? gst_buffer_get_size (exif_data) : 0;
if (exif_data && exif_size + 8 >= G_GUINT64_CONSTANT (65536)) {
GST_WARNING_OBJECT (self, "Exif tags data size exceed maximum size");
gst_buffer_unref (exif_data);
exif_data = NULL;
}
if (exif_data) {
data = g_malloc0 (exif_size + 6);
memcpy (data, "Exif", 4);
gst_buffer_extract (exif_data, 0, data + 6, exif_size);
m = gst_jif_mux_new_marker (GST_JPEG_MARKER_APP1, exif_size + 6, data,
TRUE);
gst_buffer_unref (exif_data);
if (app1_exif) {
gst_jif_mux_marker_free ((GstJifMuxMarker *) app1_exif->data);
app1_exif->data = m;
} else {
pos = file_hdr;
if (app0_jfif)
pos = app0_jfif;
pos = g_list_next (pos);
self->markers = g_list_insert_before (self->markers, pos, m);
if (pos) {
app1_exif = g_list_previous (pos);
} else {
app1_exif = g_list_last (self->markers);
}
}
modified = TRUE;
}
}
/* add xmp */
xmp_data =
gst_tag_xmp_writer_tag_list_to_xmp_buffer (GST_TAG_XMP_WRITER (self),
tags, FALSE);
if (xmp_data) {
guint8 *data;
gsize size;
GList *pos;
size = gst_buffer_get_size (xmp_data);
data = g_malloc (size + 29);
memcpy (data, "http://ns.adobe.com/xap/1.0/\0", 29);
gst_buffer_extract (xmp_data, 0, &data[29], size);
m = gst_jif_mux_new_marker (GST_JPEG_MARKER_APP1, size + 29, data, TRUE);
/*
* Replace the old xmp marker and not add a new one.
* There shouldn't be a xmp packet in the input, but it is better
* to be safe than add another one and end up with 2 packets.
*/
if (app1_xmp) {
gst_jif_mux_marker_free ((GstJifMuxMarker *) app1_xmp->data);
app1_xmp->data = m;
} else {
pos = file_hdr;
if (app1_exif)
pos = app1_exif;
else if (app0_jfif)
pos = app0_jfif;
pos = g_list_next (pos);
self->markers = g_list_insert_before (self->markers, pos, m);
}
gst_buffer_unref (xmp_data);
modified = TRUE;
}
/* add jpeg comment from any of those */
(void) (gst_tag_list_get_string (tags, GST_TAG_COMMENT, &str) ||
gst_tag_list_get_string (tags, GST_TAG_DESCRIPTION, &str) ||
gst_tag_list_get_string (tags, GST_TAG_TITLE, &str));
if (str) {
GST_DEBUG_OBJECT (self, "set COM marker to '%s'", str);
/* insert new marker into self->markers list */
m = gst_jif_mux_new_marker (GST_JPEG_MARKER_COM, strlen (str) + 1,
(const guint8 *) str, TRUE);
/* FIXME: if we have one already, replace */
/* this should go before SOS, maybe at the end of file-header */
self->markers = g_list_insert_before (self->markers, frame_hdr, m);
modified = TRUE;
}
if (tags && cleanup_tags)
gst_tag_list_unref (tags);
return modified;
}
static GstFlowReturn
gst_jif_mux_recombine_image (GstJifMux * self, GstBuffer ** new_buf,
GstBuffer * old_buf)
{
GstBuffer *buf;
GstByteWriter *writer;
GstJifMuxMarker *m;
GList *node;
guint size = self->scan_size;
gboolean writer_status = TRUE;
GstMapInfo map;
/* iterate list and collect size */
for (node = self->markers; node; node = g_list_next (node)) {
m = (GstJifMuxMarker *) node->data;
/* some markers like e.g. SOI are empty */
if (m->size) {
size += 2 + m->size;
}
/* 0xff <marker> */
size += 2;
}
GST_INFO_OBJECT (self, "old size: %" G_GSIZE_FORMAT ", new size: %u",
gst_buffer_get_size (old_buf), size);
/* allocate new buffer */
buf = gst_buffer_new_allocate (NULL, size, NULL);
/* copy buffer metadata */
gst_buffer_copy_into (buf, old_buf,
GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS, 0, -1);
/* memcopy markers */
gst_buffer_map (buf, &map, GST_MAP_WRITE);
writer = gst_byte_writer_new_with_data (map.data, map.size, TRUE);
for (node = self->markers; node && writer_status; node = g_list_next (node)) {
m = (GstJifMuxMarker *) node->data;
writer_status &= gst_byte_writer_put_uint8 (writer, 0xff);
writer_status &= gst_byte_writer_put_uint8 (writer, m->marker);
GST_DEBUG_OBJECT (self, "marker = %2x, size = %u", m->marker, m->size + 2);
if (m->size) {
writer_status &= gst_byte_writer_put_uint16_be (writer, m->size + 2);
writer_status &= gst_byte_writer_put_data (writer, m->data, m->size);
}
if (m->marker == GST_JPEG_MARKER_SOS) {
GST_DEBUG_OBJECT (self, "scan data, size = %u", self->scan_size);
writer_status &=
gst_byte_writer_put_data (writer, self->scan_data, self->scan_size);
}
}
gst_buffer_unmap (buf, &map);
gst_byte_writer_free (writer);
if (!writer_status) {
GST_WARNING_OBJECT (self, "Failed to write to buffer, calculated size "
"was probably too short");
g_assert_not_reached ();
}
*new_buf = buf;
return GST_FLOW_OK;
}
static GstFlowReturn
gst_jif_mux_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstJifMux *self = GST_JIF_MUX (parent);
GstFlowReturn fret = GST_FLOW_OK;
#if 0
GST_MEMDUMP ("jpeg beg", GST_BUFFER_DATA (buf), 64);
GST_MEMDUMP ("jpeg end", GST_BUFFER_DATA (buf) + GST_BUFFER_SIZE (buf) - 64,
64);
#endif
/* we should have received a whole picture from SOI to EOI
* build a list of markers */
if (gst_jif_mux_parse_image (self, buf)) {
/* modify marker list */
if (gst_jif_mux_mangle_markers (self)) {
/* the list was changed, remux */
GstBuffer *old = buf;
fret = gst_jif_mux_recombine_image (self, &buf, old);
gst_buffer_unref (old);
}
}
/* free the marker list */
gst_jif_mux_reset (self);
if (fret == GST_FLOW_OK) {
fret = gst_pad_push (self->srcpad, buf);
}
return fret;
}
static GstStateChangeReturn
gst_jif_mux_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret;
GstJifMux *self = GST_JIF_MUX_CAST (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_tag_setter_reset_tags (GST_TAG_SETTER (self));
break;
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
return ret;
}
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