gstreamer/gst/encoding/gstsmartencoder.c

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/* GStreamer Smart Video Encoder element
* Copyright (C) <2010> Edward Hervey <bilboed@gmail.com>
*
* 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.
*/
/* TODO:
* * Implement get_caps/set_caps (store/forward caps)
* * Adjust template caps to the formats we can support
**/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "gstsmartencoder.h"
GST_DEBUG_CATEGORY_STATIC (smart_encoder_debug);
#define GST_CAT_DEFAULT smart_encoder_debug
/* FIXME : Update this with new caps */
/* WARNING : We can only allow formats with closed-GOP */
#define ALLOWED_CAPS "video/x-h263;video/x-intel-h263;"\
"video/mpeg,mpegversion=(int)1,systemstream=(boolean)false;"\
"video/mpeg,mpegversion=(int)2,systemstream=(boolean)false;"
static GstStaticPadTemplate src_template =
GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (ALLOWED_CAPS)
);
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (ALLOWED_CAPS)
);
static GQuark INTERNAL_ELEMENT;
/* GstSmartEncoder signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
PROP_0
/* FILL ME */
};
static void
_do_init (void)
{
INTERNAL_ELEMENT = g_quark_from_static_string ("internal-element");
};
G_DEFINE_TYPE_EXTENDED (GstSmartEncoder, gst_smart_encoder, GST_TYPE_ELEMENT, 0,
_do_init ());
static void gst_smart_encoder_dispose (GObject * object);
static gboolean setup_recoder_pipeline (GstSmartEncoder * smart_encoder);
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static GstFlowReturn gst_smart_encoder_chain (GstPad * pad, GstObject * parent,
GstBuffer * buf);
static gboolean smart_encoder_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
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static gboolean smart_encoder_sink_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static GstCaps *smart_encoder_sink_getcaps (GstPad * pad, GstCaps * filter);
static GstStateChangeReturn
gst_smart_encoder_change_state (GstElement * element,
GstStateChange transition);
static void
gst_smart_encoder_class_init (GstSmartEncoderClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_class;
element_class = (GstElementClass *) klass;
gobject_class = G_OBJECT_CLASS (klass);
gst_smart_encoder_parent_class = g_type_class_peek_parent (klass);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_template));
gst_element_class_set_static_metadata (element_class, "Smart Video Encoder",
"Codec/Recoder/Video",
"Re-encodes portions of Video that lay on segment boundaries",
"Edward Hervey <bilboed@gmail.com>");
gobject_class->dispose = (GObjectFinalizeFunc) (gst_smart_encoder_dispose);
element_class->change_state = gst_smart_encoder_change_state;
GST_DEBUG_CATEGORY_INIT (smart_encoder_debug, "smartencoder", 0,
"Smart Encoder");
}
static void
smart_encoder_reset (GstSmartEncoder * smart_encoder)
{
gst_segment_init (smart_encoder->segment, GST_FORMAT_UNDEFINED);
if (smart_encoder->encoder) {
/* Clean up/remove elements */
gst_element_set_state (smart_encoder->encoder, GST_STATE_NULL);
gst_element_set_state (smart_encoder->decoder, GST_STATE_NULL);
gst_element_set_bus (smart_encoder->encoder, NULL);
gst_element_set_bus (smart_encoder->decoder, NULL);
gst_pad_set_active (smart_encoder->internal_srcpad, FALSE);
gst_pad_set_active (smart_encoder->internal_sinkpad, FALSE);
gst_object_unref (smart_encoder->encoder);
gst_object_unref (smart_encoder->decoder);
gst_object_unref (smart_encoder->internal_srcpad);
gst_object_unref (smart_encoder->internal_sinkpad);
smart_encoder->encoder = NULL;
smart_encoder->decoder = NULL;
smart_encoder->internal_sinkpad = NULL;
smart_encoder->internal_srcpad = NULL;
}
if (smart_encoder->newsegment) {
gst_event_unref (smart_encoder->newsegment);
smart_encoder->newsegment = NULL;
}
}
static void
gst_smart_encoder_init (GstSmartEncoder * smart_encoder)
{
smart_encoder->sinkpad =
gst_pad_new_from_static_template (&sink_template, "sink");
gst_pad_set_chain_function (smart_encoder->sinkpad, gst_smart_encoder_chain);
gst_pad_set_event_function (smart_encoder->sinkpad, smart_encoder_sink_event);
gst_pad_set_query_function (smart_encoder->sinkpad, smart_encoder_sink_query);
gst_element_add_pad (GST_ELEMENT (smart_encoder), smart_encoder->sinkpad);
smart_encoder->srcpad =
gst_pad_new_from_static_template (&src_template, "src");
gst_pad_use_fixed_caps (smart_encoder->srcpad);
gst_element_add_pad (GST_ELEMENT (smart_encoder), smart_encoder->srcpad);
smart_encoder->segment = gst_segment_new ();
smart_encoder_reset (smart_encoder);
}
void
gst_smart_encoder_dispose (GObject * object)
{
GstSmartEncoder *smart_encoder = (GstSmartEncoder *) object;
if (smart_encoder->segment)
gst_segment_free (smart_encoder->segment);
smart_encoder->segment = NULL;
if (smart_encoder->available_caps)
gst_caps_unref (smart_encoder->available_caps);
smart_encoder->available_caps = NULL;
G_OBJECT_CLASS (gst_smart_encoder_parent_class)->dispose (object);
}
static GstFlowReturn
gst_smart_encoder_reencode_gop (GstSmartEncoder * smart_encoder)
{
GstFlowReturn res = GST_FLOW_OK;
GList *tmp;
if (smart_encoder->encoder == NULL) {
if (!setup_recoder_pipeline (smart_encoder))
return GST_FLOW_ERROR;
}
/* Activate elements */
/* Set elements to PAUSED */
gst_element_set_state (smart_encoder->encoder, GST_STATE_PAUSED);
gst_element_set_state (smart_encoder->decoder, GST_STATE_PAUSED);
GST_INFO ("Pushing Flush start/stop to clean decoder/encoder");
gst_pad_push_event (smart_encoder->internal_srcpad,
gst_event_new_flush_start ());
gst_pad_push_event (smart_encoder->internal_srcpad,
gst_event_new_flush_stop (TRUE));
/* push newsegment */
GST_INFO ("Pushing newsegment %" GST_PTR_FORMAT, smart_encoder->newsegment);
gst_pad_push_event (smart_encoder->internal_srcpad,
gst_event_ref (smart_encoder->newsegment));
/* Push buffers through our pads */
GST_DEBUG ("Pushing pending buffers");
for (tmp = smart_encoder->pending_gop; tmp; tmp = tmp->next) {
GstBuffer *buf = (GstBuffer *) tmp->data;
res = gst_pad_push (smart_encoder->internal_srcpad, buf);
if (G_UNLIKELY (res != GST_FLOW_OK))
break;
}
if (G_UNLIKELY (res != GST_FLOW_OK)) {
GST_WARNING ("Error pushing pending buffers : %s", gst_flow_get_name (res));
/* Remove pending bfufers */
for (tmp = smart_encoder->pending_gop; tmp; tmp = tmp->next) {
gst_buffer_unref ((GstBuffer *) tmp->data);
}
} else {
GST_INFO ("Pushing out EOS to flush out decoder/encoder");
gst_pad_push_event (smart_encoder->internal_srcpad, gst_event_new_eos ());
}
/* Activate elements */
/* Set elements to PAUSED */
gst_element_set_state (smart_encoder->encoder, GST_STATE_NULL);
gst_element_set_state (smart_encoder->decoder, GST_STATE_NULL);
g_list_free (smart_encoder->pending_gop);
smart_encoder->pending_gop = NULL;
return res;
}
static GstFlowReturn
gst_smart_encoder_push_pending_gop (GstSmartEncoder * smart_encoder)
{
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guint64 cstart, cstop;
GList *tmp;
GstFlowReturn res = GST_FLOW_OK;
GST_DEBUG ("Pushing pending GOP (%" GST_TIME_FORMAT " -- %" GST_TIME_FORMAT
")", GST_TIME_ARGS (smart_encoder->gop_start),
GST_TIME_ARGS (smart_encoder->gop_stop));
/* If GOP is entirely within segment, just push downstream */
if (gst_segment_clip (smart_encoder->segment, GST_FORMAT_TIME,
smart_encoder->gop_start, smart_encoder->gop_stop, &cstart, &cstop)) {
if ((cstart != smart_encoder->gop_start)
|| (cstop != smart_encoder->gop_stop)) {
GST_DEBUG ("GOP needs to be re-encoded from %" GST_TIME_FORMAT " to %"
GST_TIME_FORMAT, GST_TIME_ARGS (cstart), GST_TIME_ARGS (cstop));
res = gst_smart_encoder_reencode_gop (smart_encoder);
} else {
/* The whole GOP is within the segment, push all pending buffers downstream */
GST_DEBUG ("GOP doesn't need to be modified, pushing downstream");
for (tmp = smart_encoder->pending_gop; tmp; tmp = tmp->next) {
GstBuffer *buf = (GstBuffer *) tmp->data;
res = gst_pad_push (smart_encoder->srcpad, buf);
if (G_UNLIKELY (res != GST_FLOW_OK))
break;
}
}
} else {
/* The whole GOP is outside the segment, there's most likely
* a bug somewhere. */
GST_WARNING
("GOP is entirely outside of the segment, upstream gave us too much data");
for (tmp = smart_encoder->pending_gop; tmp; tmp = tmp->next) {
gst_buffer_unref ((GstBuffer *) tmp->data);
}
}
if (smart_encoder->pending_gop) {
g_list_free (smart_encoder->pending_gop);
smart_encoder->pending_gop = NULL;
}
smart_encoder->gop_start = GST_CLOCK_TIME_NONE;
smart_encoder->gop_stop = GST_CLOCK_TIME_NONE;
return res;
}
static GstFlowReturn
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gst_smart_encoder_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstSmartEncoder *smart_encoder;
GstFlowReturn res = GST_FLOW_OK;
gboolean discont, keyframe;
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smart_encoder = GST_SMART_ENCODER (parent);
discont = GST_BUFFER_IS_DISCONT (buf);
keyframe = !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
GST_DEBUG ("New buffer %s %s %" GST_TIME_FORMAT,
discont ? "discont" : "",
keyframe ? "keyframe" : "", GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
if (keyframe) {
GST_DEBUG ("Got a keyframe");
/* If there's a pending GOP, flush it out */
if (smart_encoder->pending_gop) {
/* Mark gop_stop */
smart_encoder->gop_stop = GST_BUFFER_TIMESTAMP (buf);
/* flush pending */
res = gst_smart_encoder_push_pending_gop (smart_encoder);
if (G_UNLIKELY (res != GST_FLOW_OK))
goto beach;
}
/* Mark gop_start for new gop */
smart_encoder->gop_start = GST_BUFFER_TIMESTAMP (buf);
}
/* Store buffer */
smart_encoder->pending_gop = g_list_append (smart_encoder->pending_gop, buf);
/* Update GOP stop position */
if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
smart_encoder->gop_stop = GST_BUFFER_TIMESTAMP (buf);
if (GST_BUFFER_DURATION_IS_VALID (buf))
smart_encoder->gop_stop += GST_BUFFER_DURATION (buf);
}
GST_DEBUG ("Buffer stored , Current GOP : %" GST_TIME_FORMAT " -- %"
GST_TIME_FORMAT, GST_TIME_ARGS (smart_encoder->gop_start),
GST_TIME_ARGS (smart_encoder->gop_stop));
beach:
return res;
}
static gboolean
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smart_encoder_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
gboolean res = TRUE;
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GstSmartEncoder *smart_encoder = GST_SMART_ENCODER (parent);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_STOP:
smart_encoder_reset (smart_encoder);
break;
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case GST_EVENT_SEGMENT:
{
gst_event_copy_segment (event, smart_encoder->segment);
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GST_DEBUG_OBJECT (smart_encoder, "segment: %" GST_SEGMENT_FORMAT,
smart_encoder->segment);
if (smart_encoder->segment->format != GST_FORMAT_TIME)
GST_ERROR
("smart_encoder can not handle streams not specified in GST_FORMAT_TIME");
/* And keep a copy for further usage */
if (smart_encoder->newsegment)
gst_event_unref (smart_encoder->newsegment);
smart_encoder->newsegment = gst_event_ref (event);
}
break;
case GST_EVENT_EOS:
GST_DEBUG ("Eos, flushing remaining data");
gst_smart_encoder_push_pending_gop (smart_encoder);
break;
default:
break;
}
res = gst_pad_push_event (smart_encoder->srcpad, event);
return res;
}
static GstCaps *
smart_encoder_sink_getcaps (GstPad * pad, GstCaps * filter)
{
GstCaps *peer, *tmpl, *res;
GstSmartEncoder *smart_encoder = GST_SMART_ENCODER (gst_pad_get_parent (pad));
/* Use computed caps */
if (smart_encoder->available_caps)
tmpl = gst_caps_ref (smart_encoder->available_caps);
else
tmpl = gst_static_pad_template_get_caps (&src_template);
/* Try getting it from downstream */
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peer = gst_pad_peer_query_caps (smart_encoder->srcpad, tmpl);
if (peer == NULL) {
res = tmpl;
} else {
res = peer;
gst_caps_unref (tmpl);
}
gst_object_unref (smart_encoder);
return res;
}
static gboolean
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smart_encoder_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
gboolean res;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CAPS:
{
GstCaps *filter, *caps;
gst_query_parse_caps (query, &filter);
caps = smart_encoder_sink_getcaps (pad, filter);
gst_query_set_caps_result (query, caps);
gst_caps_unref (caps);
res = TRUE;
break;
}
default:
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res = gst_pad_query_default (pad, parent, query);
break;
}
return res;
}
/*****************************************
* Internal encoder/decoder pipeline *
******************************************/
static GstElementFactory *
get_decoder_factory (GstCaps * caps)
{
GstElementFactory *fact = NULL;
GList *decoders, *tmp;
tmp =
gst_element_factory_list_get_elements (GST_ELEMENT_FACTORY_TYPE_DECODER,
GST_RANK_MARGINAL);
decoders = gst_element_factory_list_filter (tmp, caps, GST_PAD_SINK, FALSE);
gst_plugin_feature_list_free (tmp);
for (tmp = decoders; tmp; tmp = tmp->next) {
/* We just pick the first one */
fact = (GstElementFactory *) tmp->data;
gst_object_ref (fact);
break;
}
gst_plugin_feature_list_free (decoders);
return fact;
}
static GstElementFactory *
get_encoder_factory (GstCaps * caps)
{
GstElementFactory *fact = NULL;
GList *encoders, *tmp;
tmp =
gst_element_factory_list_get_elements (GST_ELEMENT_FACTORY_TYPE_ENCODER,
GST_RANK_MARGINAL);
encoders = gst_element_factory_list_filter (tmp, caps, GST_PAD_SRC, FALSE);
gst_plugin_feature_list_free (tmp);
for (tmp = encoders; tmp; tmp = tmp->next) {
/* We just pick the first one */
fact = (GstElementFactory *) tmp->data;
gst_object_ref (fact);
break;
}
gst_plugin_feature_list_free (encoders);
return fact;
}
static GstElement *
get_decoder (GstCaps * caps)
{
GstElementFactory *fact = get_decoder_factory (caps);
GstElement *res = NULL;
if (fact) {
res = gst_element_factory_create (fact, "internal-decoder");
gst_object_unref (fact);
}
return res;
}
static GstElement *
get_encoder (GstCaps * caps)
{
GstElementFactory *fact = get_encoder_factory (caps);
GstElement *res = NULL;
if (fact) {
res = gst_element_factory_create (fact, "internal-encoder");
gst_object_unref (fact);
}
return res;
}
static GstFlowReturn
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internal_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstSmartEncoder *smart_encoder =
g_object_get_qdata ((GObject *) pad, INTERNAL_ELEMENT);
return gst_pad_push (smart_encoder->srcpad, buf);
}
static gboolean
setup_recoder_pipeline (GstSmartEncoder * smart_encoder)
{
GstPad *tmppad;
GstCaps *caps;
/* Fast path */
if (G_UNLIKELY (smart_encoder->encoder))
return TRUE;
GST_DEBUG ("Creating internal decoder and encoder");
/* Create decoder/encoder */
caps = gst_pad_get_current_caps (smart_encoder->sinkpad);
smart_encoder->decoder = get_decoder (caps);
if (G_UNLIKELY (smart_encoder->decoder == NULL))
goto no_decoder;
gst_caps_unref (caps);
gst_element_set_bus (smart_encoder->decoder, GST_ELEMENT_BUS (smart_encoder));
caps = gst_pad_get_current_caps (smart_encoder->sinkpad);
smart_encoder->encoder = get_encoder (caps);
if (G_UNLIKELY (smart_encoder->encoder == NULL))
goto no_encoder;
gst_caps_unref (caps);
gst_element_set_bus (smart_encoder->encoder, GST_ELEMENT_BUS (smart_encoder));
GST_DEBUG ("Creating internal pads");
/* Create internal pads */
/* Source pad which we'll use to feed data to decoders */
smart_encoder->internal_srcpad = gst_pad_new ("internal_src", GST_PAD_SRC);
g_object_set_qdata ((GObject *) smart_encoder->internal_srcpad,
INTERNAL_ELEMENT, smart_encoder);
gst_pad_set_active (smart_encoder->internal_srcpad, TRUE);
/* Sink pad which will get the buffers from the encoder.
* Note: We don't need an event function since we'll be discarding all
* of them. */
smart_encoder->internal_sinkpad = gst_pad_new ("internal_sink", GST_PAD_SINK);
g_object_set_qdata ((GObject *) smart_encoder->internal_sinkpad,
INTERNAL_ELEMENT, smart_encoder);
gst_pad_set_chain_function (smart_encoder->internal_sinkpad, internal_chain);
gst_pad_set_active (smart_encoder->internal_sinkpad, TRUE);
GST_DEBUG ("Linking pads to elements");
/* Link everything */
tmppad = gst_element_get_static_pad (smart_encoder->encoder, "src");
if (GST_PAD_LINK_FAILED (gst_pad_link (tmppad,
smart_encoder->internal_sinkpad)))
goto sinkpad_link_fail;
gst_object_unref (tmppad);
if (!gst_element_link (smart_encoder->decoder, smart_encoder->encoder))
goto encoder_decoder_link_fail;
tmppad = gst_element_get_static_pad (smart_encoder->decoder, "sink");
if (GST_PAD_LINK_FAILED (gst_pad_link (smart_encoder->internal_srcpad,
tmppad)))
goto srcpad_link_fail;
gst_object_unref (tmppad);
GST_DEBUG ("Done creating internal elements/pads");
return TRUE;
no_decoder:
{
GST_WARNING ("Couldn't find a decoder for %" GST_PTR_FORMAT, caps);
gst_caps_unref (caps);
return FALSE;
}
no_encoder:
{
GST_WARNING ("Couldn't find an encoder for %" GST_PTR_FORMAT, caps);
gst_caps_unref (caps);
return FALSE;
}
srcpad_link_fail:
{
gst_object_unref (tmppad);
GST_WARNING ("Couldn't link internal srcpad to decoder");
return FALSE;
}
sinkpad_link_fail:
{
gst_object_unref (tmppad);
GST_WARNING ("Couldn't link encoder to internal sinkpad");
return FALSE;
}
encoder_decoder_link_fail:
{
GST_WARNING ("Couldn't link decoder to encoder");
return FALSE;
}
}
static GstStateChangeReturn
gst_smart_encoder_find_elements (GstSmartEncoder * smart_encoder)
{
guint i, n;
GstCaps *tmpl, *st, *res;
GstElementFactory *dec, *enc;
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
if (G_UNLIKELY (smart_encoder->available_caps))
goto beach;
/* Iterate over all pad template caps and see if we have both an
* encoder and a decoder for those media types */
tmpl = gst_static_pad_template_get_caps (&src_template);
res = gst_caps_new_empty ();
n = gst_caps_get_size (tmpl);
for (i = 0; i < n; i++) {
st = gst_caps_copy_nth (tmpl, i);
GST_DEBUG_OBJECT (smart_encoder,
"Checking for available decoder and encoder for %" GST_PTR_FORMAT, st);
if (!(dec = get_decoder_factory (st))) {
gst_caps_unref (st);
continue;
}
gst_object_unref (dec);
if (!(enc = get_encoder_factory (st))) {
gst_caps_unref (st);
continue;
}
gst_object_unref (enc);
GST_DEBUG_OBJECT (smart_encoder, "OK");
gst_caps_append (res, st);
}
gst_caps_unref (tmpl);
if (gst_caps_is_empty (res)) {
gst_caps_unref (res);
ret = GST_STATE_CHANGE_FAILURE;
} else
smart_encoder->available_caps = res;
GST_DEBUG_OBJECT (smart_encoder, "Done, available_caps:%" GST_PTR_FORMAT,
smart_encoder->available_caps);
beach:
return ret;
}
/******************************************
* GstElement vmethod implementations *
******************************************/
static GstStateChangeReturn
gst_smart_encoder_change_state (GstElement * element, GstStateChange transition)
{
GstSmartEncoder *smart_encoder;
GstStateChangeReturn ret;
g_return_val_if_fail (GST_IS_SMART_ENCODER (element),
GST_STATE_CHANGE_FAILURE);
smart_encoder = GST_SMART_ENCODER (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
/* Figure out which elements are available */
if ((ret =
gst_smart_encoder_find_elements (smart_encoder)) ==
GST_STATE_CHANGE_FAILURE)
goto beach;
break;
default:
break;
}
ret =
GST_ELEMENT_CLASS (gst_smart_encoder_parent_class)->change_state (element,
transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
smart_encoder_reset (smart_encoder);
break;
default:
break;
}
beach:
return ret;
}