gstreamer/gst/transcode/gsttranscodebin.c
Guillaume Desmottes b5a28df0f3 transcodebin: fix caps NULL unref
gst_pad_get_current_caps() can return a NULL pointer which was raisin a CRITICAL.
2020-04-16 16:17:56 +00:00

695 lines
20 KiB
C

/* GStreamer
* Copyright (C) 2019 Thibault Saunier <tsaunier@igalia.com>
*
* gsttranscodebin.c:
*
* 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 "gsttranscoding.h"
#include <glib/gi18n-lib.h>
#include <gst/pbutils/pbutils.h>
#include <gst/pbutils/missing-plugins.h>
GST_DEBUG_CATEGORY_STATIC (gst_transcodebin_debug);
#define GST_CAT_DEFAULT gst_transcodebin_debug
static GstStaticPadTemplate transcode_bin_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate transcode_bin_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
typedef struct
{
GstBin parent;
GstElement *decodebin;
GstElement *encodebin;
GstEncodingProfile *profile;
gboolean avoid_reencoding;
GstPad *sinkpad;
GstPad *srcpad;
GstElement *audio_filter;
GstElement *video_filter;
} GstTranscodeBin;
typedef struct
{
GstBinClass parent;
} GstTranscodeBinClass;
/* *INDENT-OFF* */
#define GST_TYPE_TRANSCODE_BIN (gst_transcode_bin_get_type ())
#define GST_TRANSCODE_BIN(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_TRANSCODE_BIN, GstTranscodeBin))
#define GST_TRANSCODE_BIN_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TRANSCODE_BIN_TYPE, GstTranscodeBinClass))
#define GST_IS_TRANSCODE_BIN(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TRANSCODE_BIN_TYPE))
#define GST_IS_TRANSCODE_BIN_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TRANSCODE_BIN_TYPE))
#define GST_TRANSCODE_BIN_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TRANSCODE_BIN_TYPE, GstTranscodeBinClass))
#define DEFAULT_AVOID_REENCODING FALSE
G_DEFINE_TYPE (GstTranscodeBin, gst_transcode_bin, GST_TYPE_BIN)
enum
{
PROP_0,
PROP_PROFILE,
PROP_AVOID_REENCODING,
PROP_VIDEO_FILTER,
PROP_AUDIO_FILTER,
LAST_PROP
};
static void
post_missing_plugin_error (GstElement * dec, const gchar * element_name)
{
GstMessage *msg;
msg = gst_missing_element_message_new (dec, element_name);
gst_element_post_message (dec, msg);
GST_ELEMENT_ERROR (dec, CORE, MISSING_PLUGIN,
("Missing element '%s' - check your GStreamer installation.",
element_name), (NULL));
}
/* *INDENT-ON* */
static GstPad *
_insert_filter (GstTranscodeBin * self, GstPad * sinkpad, GstPad * pad,
GstCaps * caps)
{
GstPad *filter_src = NULL, *filter_sink = NULL, *convert_sink, *convert_src;
GstElement *filter = NULL, *convert;
GstObject *filter_parent;
const gchar *media_type;
gboolean audio = TRUE;
media_type = gst_structure_get_name (gst_caps_get_structure (caps, 0));
if (self->video_filter && g_str_has_prefix (media_type, "video")) {
audio = FALSE;
if (!g_strcmp0 (media_type, "video/x-raw"))
filter = self->video_filter;
else
GST_ERROR_OBJECT (pad, "decodebin pad does not produce raw data (%"
GST_PTR_FORMAT "), cannot add video filter '%s'", caps,
GST_ELEMENT_NAME (self->video_filter));
} else if (self->audio_filter && g_str_has_prefix (media_type, "audio")) {
if (!g_strcmp0 (media_type, "audio/x-raw"))
filter = self->audio_filter;
else
GST_ERROR_OBJECT (pad, "decodebin pad does not produce raw data (%"
GST_PTR_FORMAT "), cannot add audio filter '%s'", caps,
GST_ELEMENT_NAME (self->audio_filter));
}
if (!filter)
return pad;
if ((filter_parent = gst_object_get_parent (GST_OBJECT (filter)))) {
GST_WARNING_OBJECT (self,
"Filter already in use (inside %" GST_PTR_FORMAT ").", filter_parent);
GST_FIXME_OBJECT (self,
"Handle transcoding several streams of a same kind.");
gst_object_unref (filter_parent);
return pad;
}
/* We are guaranteed filters only have 1 unique sinkpad and srcpad */
GST_OBJECT_LOCK (filter);
filter_sink = filter->sinkpads->data;
filter_src = filter->srcpads->data;
GST_OBJECT_UNLOCK (filter);
if (audio)
convert = gst_element_factory_make ("audioconvert", NULL);
else
convert = gst_element_factory_make ("videoconvert", NULL);
if (!convert) {
GST_ELEMENT_ERROR (self, CORE, MISSING_PLUGIN,
(_("Missing element '%s' - check your GStreamer installation."),
audio ? "audioconvert" : "videoconvert"),
("Cannot add filter as %s element is missing",
audio ? "audioconvert" : "videoconvert"));
return pad;
}
gst_bin_add_many (GST_BIN (self), convert, gst_object_ref (filter), NULL);
convert_sink = gst_element_get_static_pad (convert, "sink");
g_assert (convert_sink);
if (G_UNLIKELY (gst_pad_link (pad, convert_sink) != GST_PAD_LINK_OK)) {
GstCaps *othercaps = gst_pad_get_pad_template_caps (convert_sink);
caps = gst_pad_get_current_caps (pad);
GST_ELEMENT_ERROR (self, CORE, PAD,
(NULL),
("Couldn't link pads \n\n %" GST_PTR_FORMAT ": %" GST_PTR_FORMAT
"\n\n and \n\n %" GST_PTR_FORMAT ": %" GST_PTR_FORMAT
"\n\n", pad, caps, convert_sink, othercaps));
gst_object_unref (convert_sink);
gst_caps_unref (caps);
gst_caps_unref (othercaps);
}
gst_object_unref (convert_sink);
convert_src = gst_element_get_static_pad (convert, "src");
g_assert (convert_src);
if (G_UNLIKELY (gst_pad_link (convert_src, filter_sink) != GST_PAD_LINK_OK)) {
GstCaps *othercaps = gst_pad_get_pad_template_caps (filter_sink);
caps = gst_pad_get_pad_template_caps (convert_src);
GST_ELEMENT_ERROR (self, CORE, PAD,
(NULL),
("Couldn't link pads \n\n %" GST_PTR_FORMAT ": %" GST_PTR_FORMAT
"\n\n and \n\n %" GST_PTR_FORMAT ": %" GST_PTR_FORMAT
"\n\n", convert_src, caps, filter_sink, othercaps));
gst_object_unref (convert_src);
gst_caps_unref (caps);
gst_caps_unref (othercaps);
}
gst_object_unref (convert_src);
gst_element_sync_state_with_parent (convert);
gst_element_sync_state_with_parent (filter);
GST_DEBUG_OBJECT (self, "added %s filter '%s'",
audio ? "audio" : "video", GST_ELEMENT_NAME (filter));
return filter_src;
}
static void
pad_added_cb (GstElement * decodebin, GstPad * pad, GstTranscodeBin * self)
{
GstCaps *caps;
GstPad *sinkpad = NULL;
GstPadLinkReturn lret;
caps = gst_pad_query_caps (pad, NULL);
GST_DEBUG_OBJECT (decodebin, "Pad added, caps: %" GST_PTR_FORMAT, caps);
g_signal_emit_by_name (self->encodebin, "request-pad", caps, &sinkpad);
if (sinkpad == NULL) {
gchar *stream_id = gst_pad_get_stream_id (pad);
GST_ELEMENT_WARNING_WITH_DETAILS (self, STREAM, FORMAT,
(NULL), ("Stream with caps: %" GST_PTR_FORMAT " can not be"
" encoded in the defined encoding formats",
caps),
("can-t-encode-stream", G_TYPE_BOOLEAN, TRUE,
"stream-caps", GST_TYPE_CAPS, caps,
"stream-id", G_TYPE_STRING, stream_id, NULL));
g_free (stream_id);
return;
}
if (caps)
gst_caps_unref (caps);
pad = _insert_filter (self, sinkpad, pad, caps);
lret = gst_pad_link (pad, sinkpad);
switch (lret) {
case GST_PAD_LINK_OK:
break;
case GST_PAD_LINK_WAS_LINKED:
GST_FIXME_OBJECT (self, "Pad %" GST_PTR_FORMAT " was already linked",
sinkpad);
break;
default:
{
GstCaps *othercaps = gst_pad_query_caps (sinkpad, NULL);
caps = gst_pad_get_current_caps (pad);
GST_ELEMENT_ERROR_WITH_DETAILS (self, CORE, PAD,
(NULL),
("Couldn't link pads:\n %" GST_PTR_FORMAT ": %" GST_PTR_FORMAT
"\nand:\n"
" %" GST_PTR_FORMAT ": %" GST_PTR_FORMAT "\n\n",
pad, caps, sinkpad, othercaps),
("linking-error", GST_TYPE_PAD_LINK_RETURN, lret,
"source-pad", GST_TYPE_PAD, pad,
"source-caps", GST_TYPE_CAPS, caps,
"sink-pad", GST_TYPE_PAD, sinkpad,
"sink-caps", GST_TYPE_CAPS, othercaps, NULL));
gst_clear_caps (&caps);
if (othercaps)
gst_caps_unref (othercaps);
}
}
gst_object_unref (sinkpad);
}
static gboolean
make_encodebin (GstTranscodeBin * self)
{
GstPad *pad;
GST_INFO_OBJECT (self, "making new encodebin");
if (!self->profile)
goto no_profile;
self->encodebin = gst_element_factory_make ("encodebin", NULL);
if (!self->encodebin)
goto no_encodebin;
gst_bin_add (GST_BIN (self), self->encodebin);
g_object_set (self->encodebin, "profile", self->profile, NULL);
pad = gst_element_get_static_pad (self->encodebin, "src");
if (!gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (self->srcpad), pad)) {
gst_object_unref (pad);
GST_ERROR_OBJECT (self, "Could not ghost %" GST_PTR_FORMAT " srcpad",
self->encodebin);
return FALSE;
}
gst_object_unref (pad);
return gst_element_sync_state_with_parent (self->encodebin);
/* ERRORS */
no_encodebin:
{
post_missing_plugin_error (GST_ELEMENT_CAST (self), "encodebin");
GST_ELEMENT_ERROR (self, CORE, MISSING_PLUGIN, (NULL),
("No encodebin element, check your installation"));
return FALSE;
}
/* ERRORS */
no_profile:
{
GST_ELEMENT_ERROR (self, CORE, MISSING_PLUGIN, (NULL),
("No GstEncodingProfile set, can not run."));
return FALSE;
}
}
static gboolean
make_decodebin (GstTranscodeBin * self)
{
GstPad *pad;
GST_INFO_OBJECT (self, "making new decodebin");
self->decodebin = gst_element_factory_make ("decodebin", NULL);
if (!self->decodebin)
goto no_decodebin;
if (self->avoid_reencoding) {
GstCaps *decodecaps;
g_object_get (self->decodebin, "caps", &decodecaps, NULL);
if (GST_IS_ENCODING_CONTAINER_PROFILE (self->profile)) {
GList *tmp;
decodecaps = gst_caps_make_writable (decodecaps);
for (tmp = (GList *)
gst_encoding_container_profile_get_profiles
(GST_ENCODING_CONTAINER_PROFILE (self->profile)); tmp;
tmp = tmp->next) {
GstEncodingProfile *profile = tmp->data;
GstCaps *restrictions;
restrictions = gst_encoding_profile_get_restriction (profile);
if (!restrictions || gst_caps_is_any (restrictions)) {
GstCaps *encodecaps = gst_encoding_profile_get_format (profile);
GstElement *filter = NULL;
/* Filter operates on raw data so don't allow decodebin to produce
* encoded data if one is defined. */
if (GST_IS_ENCODING_VIDEO_PROFILE (profile) && self->video_filter)
filter = self->video_filter;
else if (GST_IS_ENCODING_AUDIO_PROFILE (profile)
&& self->audio_filter)
filter = self->audio_filter;
if (!filter) {
GST_DEBUG_OBJECT (self,
"adding %" GST_PTR_FORMAT " as output caps to decodebin",
encodecaps);
gst_caps_append (decodecaps, encodecaps);
}
} else {
gst_caps_unref (restrictions);
}
}
}
g_object_set (self->decodebin, "caps", decodecaps, NULL);
gst_caps_unref (decodecaps);
}
g_signal_connect (self->decodebin, "pad-added", G_CALLBACK (pad_added_cb),
self);
gst_bin_add (GST_BIN (self), self->decodebin);
pad = gst_element_get_static_pad (self->decodebin, "sink");
if (!gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (self->sinkpad), pad)) {
gst_object_unref (pad);
GST_ERROR_OBJECT (self, "Could not ghost %" GST_PTR_FORMAT " sinkpad",
self->decodebin);
return FALSE;
}
gst_object_unref (pad);
return TRUE;
/* ERRORS */
no_decodebin:
{
post_missing_plugin_error (GST_ELEMENT_CAST (self), "decodebin");
GST_ELEMENT_ERROR (self, CORE, MISSING_PLUGIN, (NULL),
("No decodebin element, check your installation"));
return FALSE;
}
}
static void
remove_all_children (GstTranscodeBin * self)
{
if (self->encodebin) {
gst_element_set_state (self->encodebin, GST_STATE_NULL);
gst_bin_remove (GST_BIN (self), self->encodebin);
self->encodebin = NULL;
}
if (self->video_filter && GST_OBJECT_PARENT (self->video_filter)) {
gst_element_set_state (self->video_filter, GST_STATE_NULL);
gst_bin_remove (GST_BIN (self), self->video_filter);
}
if (self->audio_filter && GST_OBJECT_PARENT (self->audio_filter)) {
gst_element_set_state (self->audio_filter, GST_STATE_NULL);
gst_bin_remove (GST_BIN (self), self->audio_filter);
}
if (self->decodebin) {
gst_element_set_state (self->decodebin, GST_STATE_NULL);
gst_bin_remove (GST_BIN (self), self->decodebin);
self->decodebin = NULL;
}
}
static GstStateChangeReturn
gst_transcode_bin_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret;
GstTranscodeBin *self = GST_TRANSCODE_BIN (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
if (!make_encodebin (self))
goto setup_failed;
if (!make_decodebin (self))
goto setup_failed;
break;
default:
break;
}
ret =
GST_ELEMENT_CLASS (gst_transcode_bin_parent_class)->change_state (element,
transition);
if (ret == GST_STATE_CHANGE_FAILURE)
goto beach;
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
remove_all_children (self);
break;
default:
break;
}
beach:
return ret;
setup_failed:
remove_all_children (self);
return GST_STATE_CHANGE_FAILURE;
}
static void
gst_transcode_bin_dispose (GObject * object)
{
GstTranscodeBin *self = (GstTranscodeBin *) object;
g_clear_object (&self->video_filter);
g_clear_object (&self->audio_filter);
G_OBJECT_CLASS (gst_transcode_bin_parent_class)->dispose (object);
}
static void
gst_transcode_bin_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstTranscodeBin *self = GST_TRANSCODE_BIN (object);
switch (prop_id) {
case PROP_PROFILE:
GST_OBJECT_LOCK (self);
g_value_set_object (value, self->profile);
GST_OBJECT_UNLOCK (self);
break;
case PROP_AVOID_REENCODING:
GST_OBJECT_LOCK (self);
g_value_set_boolean (value, self->avoid_reencoding);
GST_OBJECT_UNLOCK (self);
break;
case PROP_AUDIO_FILTER:
GST_OBJECT_LOCK (self);
g_value_set_object (value, self->audio_filter);
GST_OBJECT_UNLOCK (self);
break;
case PROP_VIDEO_FILTER:
GST_OBJECT_LOCK (self);
g_value_set_object (value, self->video_filter);
GST_OBJECT_UNLOCK (self);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
_set_filter (GstTranscodeBin * self, GstElement * filter, GstElement ** mfilter)
{
if (filter) {
GST_OBJECT_LOCK (filter);
if (filter->numsinkpads != 1) {
GST_ERROR_OBJECT (self, "Can not use %" GST_PTR_FORMAT
" as filter as it does not have "
" one and only one sinkpad", filter);
goto bail_out;
} else if (filter->numsrcpads != 1) {
GST_ERROR_OBJECT (self, "Can not use %" GST_PTR_FORMAT
" as filter as it does not have " " one and only one srcpad", filter);
goto bail_out;
}
GST_OBJECT_UNLOCK (filter);
}
GST_OBJECT_LOCK (self);
*mfilter = filter;
GST_OBJECT_UNLOCK (self);
return;
bail_out:
GST_OBJECT_UNLOCK (filter);
}
static void
gst_transcode_bin_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstTranscodeBin *self = GST_TRANSCODE_BIN (object);
switch (prop_id) {
case PROP_PROFILE:
GST_OBJECT_LOCK (self);
self->profile = g_value_dup_object (value);
GST_OBJECT_UNLOCK (self);
break;
case PROP_AVOID_REENCODING:
GST_OBJECT_LOCK (self);
self->avoid_reencoding = g_value_get_boolean (value);
GST_OBJECT_UNLOCK (self);
break;
case PROP_AUDIO_FILTER:
_set_filter (self, g_value_dup_object (value), &self->audio_filter);
break;
case PROP_VIDEO_FILTER:
_set_filter (self, g_value_dup_object (value), &self->video_filter);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
gst_transcode_bin_class_init (GstTranscodeBinClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GstElementClass *gstelement_klass;
object_class->dispose = gst_transcode_bin_dispose;
object_class->get_property = gst_transcode_bin_get_property;
object_class->set_property = gst_transcode_bin_set_property;
gstelement_klass = (GstElementClass *) klass;
gstelement_klass->change_state =
GST_DEBUG_FUNCPTR (gst_transcode_bin_change_state);
gst_element_class_add_pad_template (gstelement_klass,
gst_static_pad_template_get (&transcode_bin_sink_template));
gst_element_class_add_pad_template (gstelement_klass,
gst_static_pad_template_get (&transcode_bin_src_template));
gst_element_class_set_static_metadata (gstelement_klass,
"Transcode Bin", "Generic/Bin/Encoding",
"Autoplug and transcoder a stream",
"Thibault Saunier <tsaunier@igalia.com>");
/**
* GstTranscodeBin:profile:
*
* The #GstEncodingProfile to use. This property must be set before going
* to %GST_STATE_PAUSED or higher.
*/
g_object_class_install_property (object_class, PROP_PROFILE,
g_param_spec_object ("profile", "Profile",
"The GstEncodingProfile to use", GST_TYPE_ENCODING_PROFILE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
GST_PARAM_MUTABLE_READY));
/**
* GstTranscodeBin:avoid-reencoding:
*
* See #encodebin:avoid-reencoding
*/
g_object_class_install_property (object_class, PROP_AVOID_REENCODING,
g_param_spec_boolean ("avoid-reencoding", "Avoid re-encoding",
"Whether to re-encode portions of compatible video streams that lay on segment boundaries",
DEFAULT_AVOID_REENCODING,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
GST_PARAM_MUTABLE_READY));
/**
* GstTranscodeBin:video-filter:
*
* Set the video filter element/bin to use.
*/
g_object_class_install_property (object_class, PROP_VIDEO_FILTER,
g_param_spec_object ("video-filter", "Video filter",
"the video filter(s) to apply, if possible",
GST_TYPE_ELEMENT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
GST_PARAM_MUTABLE_READY));
/**
* GstTranscodeBin:audio-filter:
*
* Set the audio filter element/bin to use.
*/
g_object_class_install_property (object_class, PROP_AUDIO_FILTER,
g_param_spec_object ("audio-filter", "Audio filter",
"the audio filter(s) to apply, if possible",
GST_TYPE_ELEMENT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
GST_PARAM_MUTABLE_READY));
}
static void
gst_transcode_bin_init (GstTranscodeBin * self)
{
GstPadTemplate *pad_tmpl;
pad_tmpl = gst_static_pad_template_get (&transcode_bin_sink_template);
self->sinkpad = gst_ghost_pad_new_no_target_from_template ("sink", pad_tmpl);
gst_pad_set_active (self->sinkpad, TRUE);
gst_element_add_pad (GST_ELEMENT (self), self->sinkpad);
gst_object_unref (pad_tmpl);
pad_tmpl = gst_static_pad_template_get (&transcode_bin_src_template);
self->srcpad = gst_ghost_pad_new_no_target_from_template ("src", pad_tmpl);
gst_pad_set_active (self->srcpad, TRUE);
gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
gst_object_unref (pad_tmpl);
}
static gboolean
plugin_init (GstPlugin * plugin)
{
gboolean res = TRUE;
gst_pb_utils_init ();
GST_DEBUG_CATEGORY_INIT (gst_transcodebin_debug, "transcodebin", 0,
"Transcodebin element");
res &= gst_element_register (plugin, "transcodebin", GST_RANK_NONE,
GST_TYPE_TRANSCODE_BIN);
res &= gst_element_register (plugin, "uritranscodebin", GST_RANK_NONE,
gst_uri_transcode_bin_get_type ());
return res;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
transcode,
"A plugin containing elements for transcoding", plugin_init, VERSION,
GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)