gstreamer/sys/applemedia/vth264decbin.c
2012-11-04 00:09:59 +00:00

322 lines
9.7 KiB
C

/*
* Copyright (C) 2010 Ole André Vadla Ravnås <oravnas@cisco.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.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "vth264decbin.h"
#include <string.h>
#include <gst/video/video.h>
#define VT_H264_DEC_BIN_ERROR_STATE_DEFAULT FALSE
GST_DEBUG_CATEGORY_STATIC (gst_vt_h264_dec_bin_debug);
#define GST_CAT_DEFAULT gst_vt_h264_dec_bin_debug
enum
{
PROP_0,
PROP_ERROR_STATE,
PROP_HAPPY
};
enum
{
H264PARSE_OUTPUT_FORMAT_AVC_SAMPLE = 0,
H264PARSE_OUTPUT_FORMAT_BYTE_STREAM = 1,
H264PARSE_OUTPUT_FORMAT_INPUT = 2
};
static GstStaticPadTemplate vth264decbin_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-h264, "
"stream-format = (string) { byte-stream, avc }")
);
static GstStaticPadTemplate vth264decbin_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("NV12"))
);
#define TAA_VT_H264_DEC_BIN_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_VT_H264_DEC_BIN, \
GstVTH264DecBinPrivate))
struct _GstVTH264DecBinPrivate
{
GstElement *parser;
GstPad *parser_sinkpad;
GstElement *decoder;
GstPad *decoder_srcpad;
gboolean error_state;
gboolean seen_output;
GstClockTime prev_input_ts;
gulong output_probe;
};
GST_BOILERPLATE (GstVTH264DecBin, gst_vt_h264_dec_bin, GstBin, GST_TYPE_BIN);
static gboolean gst_vt_h264_dec_bin_on_output (GstPad * pad,
GstMiniObject * mini_obj, gpointer user_data);
static void
gst_vt_h264_dec_bin_update_error_state (GstVTH264DecBin * self,
gboolean error_state)
{
GstVTH264DecBinPrivate *priv = self->priv;
GObject *obj = (GObject *) self;
GST_OBJECT_LOCK (self);
priv->error_state = error_state;
GST_OBJECT_UNLOCK (self);
if (priv->output_probe == 0 && (error_state || !priv->seen_output)) {
GST_DEBUG_OBJECT (self, "attaching buffer probe");
priv->output_probe = gst_pad_add_buffer_probe (priv->decoder_srcpad,
G_CALLBACK (gst_vt_h264_dec_bin_on_output), self);
} else if (priv->output_probe != 0 && (!error_state && priv->seen_output)) {
GST_DEBUG_OBJECT (self, "detaching buffer probe");
gst_pad_remove_buffer_probe (priv->decoder_srcpad, priv->output_probe);
priv->output_probe = 0;
}
g_object_notify (obj, "error-state");
g_object_notify (obj, "happy");
}
static gboolean
gst_vt_h264_dec_bin_sink_setcaps (GstPad * pad, GstCaps * caps)
{
GstVTH264DecBin *self = GST_VT_H264_DEC_BIN_CAST (GST_PAD_PARENT (pad));
const gchar *format;
gint output_format;
gboolean access_unit;
format = gst_structure_get_string (gst_caps_get_structure (caps, 0),
"stream-format");
if (format == NULL)
goto no_stream_format;
if (strcmp (format, "byte-stream") == 0) {
output_format = H264PARSE_OUTPUT_FORMAT_AVC_SAMPLE;
access_unit = TRUE;
} else {
output_format = H264PARSE_OUTPUT_FORMAT_INPUT;
access_unit = FALSE;
}
g_object_set (self->priv->parser, "output-format", output_format,
"access-unit", access_unit, NULL);
return gst_pad_set_caps (GST_PAD_PEER (self->priv->parser_sinkpad), caps);
no_stream_format:
return FALSE;
}
static gboolean
gst_vt_h264_dec_bin_sink_event (GstPad * pad, GstEvent * event)
{
GstVTH264DecBin *self = GST_VT_H264_DEC_BIN_CAST (GST_PAD_PARENT (pad));
GstVTH264DecBinPrivate *priv = self->priv;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_NEWSEGMENT:
if (priv->seen_output) {
GST_DEBUG_OBJECT (self, "error state ON because of packetloss");
gst_vt_h264_dec_bin_update_error_state (self, TRUE);
}
break;
case GST_EVENT_FLUSH_STOP:
priv->seen_output = FALSE;
priv->prev_input_ts = GST_CLOCK_TIME_NONE;
GST_DEBUG_OBJECT (self, "error state OFF because of FLUSH_STOP");
gst_vt_h264_dec_bin_update_error_state (self, FALSE);
break;
default:
break;
}
return gst_pad_push_event (GST_PAD_PEER (priv->parser_sinkpad), event);
}
static GstFlowReturn
gst_vt_h264_dec_bin_sink_chain (GstPad * pad, GstBuffer * buffer)
{
GstVTH264DecBin *self = GST_VT_H264_DEC_BIN_CAST (GST_PAD_PARENT (pad));
GstVTH264DecBinPrivate *priv = self->priv;
GstClockTime cur_ts;
GstFlowReturn flow_ret;
cur_ts = GST_BUFFER_TIMESTAMP (buffer);
gst_vt_h264_dec_bin_update_error_state (self, priv->error_state);
flow_ret = gst_pad_push (GST_PAD_PEER (priv->parser_sinkpad), buffer);
if (!priv->seen_output && !priv->error_state &&
GST_CLOCK_TIME_IS_VALID (priv->prev_input_ts)) {
if (cur_ts != priv->prev_input_ts) {
GST_DEBUG_OBJECT (self,
"error state ON because of no output and detected timestamp gap");
gst_vt_h264_dec_bin_update_error_state (self, TRUE);
}
}
priv->prev_input_ts = cur_ts;
return flow_ret;
}
static gboolean
gst_vt_h264_dec_bin_on_output (GstPad * pad, GstMiniObject * mini_obj,
gpointer user_data)
{
GstVTH264DecBin *self = GST_VT_H264_DEC_BIN_CAST (user_data);
self->priv->seen_output = TRUE;
GST_DEBUG_OBJECT (self, "error state OFF because we saw output");
gst_vt_h264_dec_bin_update_error_state (self, FALSE);
return TRUE;
}
static void
gst_vt_h264_dec_bin_base_init (gpointer gclass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (gclass);
gst_element_class_set_metadata (element_class,
"VTH264DecBin",
"Decoder/Video",
"VideoToolbox H.264 decoder bin",
"Ole André Vadla Ravnås <oravnas@cisco.com>");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&vth264decbin_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&vth264decbin_src_template));
}
static void
gst_vt_h264_dec_bin_init (GstVTH264DecBin * self, GstVTH264DecBinClass * gclass)
{
GstVTH264DecBinPrivate *priv;
GstPad *ghost_pad;
self->priv = priv = TAA_VT_H264_DEC_BIN_GET_PRIVATE (self);
priv->parser = gst_element_factory_make ("h264parse", "parser");
priv->decoder = gst_element_factory_make ("vtdec_h264", "decoder");
gst_bin_add_many (GST_BIN_CAST (self), priv->parser, priv->decoder, NULL);
gst_element_link (priv->parser, priv->decoder);
priv->parser_sinkpad = gst_element_get_static_pad (priv->parser, "sink");
ghost_pad = gst_ghost_pad_new_from_template ("sink", priv->parser_sinkpad,
gst_static_pad_template_get (&vth264decbin_sink_template));
gst_pad_set_setcaps_function (ghost_pad, gst_vt_h264_dec_bin_sink_setcaps);
gst_pad_set_event_function (ghost_pad, gst_vt_h264_dec_bin_sink_event);
gst_pad_set_chain_function (ghost_pad, gst_vt_h264_dec_bin_sink_chain);
gst_element_add_pad (GST_ELEMENT_CAST (self), ghost_pad);
priv->decoder_srcpad = gst_element_get_static_pad (priv->decoder, "src");
ghost_pad = gst_ghost_pad_new_from_template ("src", priv->decoder_srcpad,
gst_static_pad_template_get (&vth264decbin_src_template));
gst_element_add_pad (GST_ELEMENT_CAST (self), ghost_pad);
priv->seen_output = FALSE;
priv->prev_input_ts = GST_CLOCK_TIME_NONE;
}
static void
gst_vt_h264_dec_bin_dispose (GObject * obj)
{
GstVTH264DecBin *self = GST_VT_H264_DEC_BIN_CAST (obj);
GstVTH264DecBinPrivate *priv = self->priv;
if (priv->parser_sinkpad != NULL) {
gst_object_unref (priv->parser_sinkpad);
priv->parser_sinkpad = NULL;
}
if (priv->decoder_srcpad != NULL) {
gst_object_unref (priv->decoder_srcpad);
priv->decoder_srcpad = NULL;
}
G_OBJECT_CLASS (parent_class)->dispose (obj);
}
static void
gst_vt_h264_dec_bin_get_property (GObject * obj, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstVTH264DecBin *self = GST_VT_H264_DEC_BIN_CAST (obj);
switch (prop_id) {
case PROP_ERROR_STATE:
GST_OBJECT_LOCK (self);
g_value_set_boolean (value, self->priv->error_state);
GST_OBJECT_UNLOCK (self);
break;
case PROP_HAPPY:
GST_OBJECT_LOCK (self);
g_value_set_boolean (value, !self->priv->error_state);
GST_OBJECT_UNLOCK (self);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, prop_id, pspec);
break;
}
}
static void
gst_vt_h264_dec_bin_class_init (GstVTH264DecBinClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
gobject_class->dispose = gst_vt_h264_dec_bin_dispose;
gobject_class->get_property = gst_vt_h264_dec_bin_get_property;
g_type_class_add_private (klass, sizeof (GstVTH264DecBinPrivate));
g_object_class_install_property (gobject_class, PROP_ERROR_STATE,
g_param_spec_boolean ("error-state", "Error State",
"Whether the decoder is currently in an error state",
VT_H264_DEC_BIN_ERROR_STATE_DEFAULT,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_HAPPY,
g_param_spec_boolean ("happy", "Happy",
"Whether the decoder is currently not in an error state",
!VT_H264_DEC_BIN_ERROR_STATE_DEFAULT,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
GST_DEBUG_CATEGORY_INIT (gst_vt_h264_dec_bin_debug,
"vth264decbin", 0, "VideoToolbox H.264 decoder bin");
}