mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-07-29 09:45:07 +00:00
6195fcf857
Unlike software MFT (Media Foundation Transform) which is synchronous in terms of processing input and output data, hardware MFT works in asynchronous mode. output data might not be available right after we pushed one input data into MFT. Note that async MFT will fire two events, one is "METransformNeedInput" which happens when MFT can accept more input data, and the other is "METransformHaveOutput", that's for signaling there's pending data which can be outputted immediately. To listen the events, we can wait synchronously via IMFMediaEventGenerator::GetEvent() or make use of IMFAsyncCallback object which is asynchronous way and the event will be notified from Media Foundation's internal worker queue thread. To handle such asynchronous operation, previous working flow was as follows (IMFMediaEventGenerator::GetEvent() was used for now) - Check if there is pending output data and push the data toward downstream. - Pulling events (from streaming thread) until there's at least one pending "METransformNeedInput" event - Then, push one data into MFT from streaming thread - Check if there is pending "METransformHaveOutput" again. If there is, push new output data to downstream (unlikely there is pending output data at this moment) Above flow was processed from upstream streaming thread. That means even if there's available output data, it could be outputted later when the next buffer is pushed from upstream streaming thread. It would introduce at least one frame latency in case of live stream. To reduce such latency, this commit modifies the flow to be fully asynchronous like hardware MFT was designed and to be able to output encoded data whenever it's available. More specifically, IMFAsyncCallback object will be used for handling "METransformNeedInput" and "METransformHaveOutput" events from Media Foundation's internal thread, and new output data will be also outputted from the Media Foundation's thread. Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1520>
107 lines
4.5 KiB
C
107 lines
4.5 KiB
C
/* GStreamer
|
|
* Copyright (C) 2020 Seungha Yang <seungha.yang@navercorp.com>
|
|
* Copyright (C) 2020 Seungha Yang <seungha@centricular.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.
|
|
*/
|
|
|
|
#ifndef __GST_MF_TRANSFORM_OBJECT_H__
|
|
#define __GST_MF_TRANSFORM_OBJECT_H__
|
|
|
|
#include <gst/gst.h>
|
|
#include "gstmfutils.h"
|
|
#include <codecapi.h>
|
|
#include "gststrmif.h"
|
|
|
|
G_BEGIN_DECLS
|
|
|
|
#define GST_TYPE_MF_TRANSFORM_OBJECT (gst_mf_transform_get_type())
|
|
G_DECLARE_FINAL_TYPE (GstMFTransform, gst_mf_transform,
|
|
GST, MF_TRANSFORM, GstObject);
|
|
|
|
#define GST_MF_TRANSFORM_FLOW_NEED_DATA GST_FLOW_CUSTOM_SUCCESS
|
|
|
|
typedef struct _GstMFTransformEnumParams
|
|
{
|
|
GUID category;
|
|
guint32 enum_flags;
|
|
MFT_REGISTER_TYPE_INFO *input_typeinfo;
|
|
MFT_REGISTER_TYPE_INFO *output_typeinfo;
|
|
|
|
guint device_index;
|
|
} GstMFTransformEnumParams;
|
|
|
|
typedef HRESULT (*GstMFTransformNewSampleCallback) (GstMFTransform * object,
|
|
IMFSample * sample,
|
|
gpointer user_data);
|
|
|
|
GstMFTransform * gst_mf_transform_new (GstMFTransformEnumParams * params);
|
|
|
|
gboolean gst_mf_transform_open (GstMFTransform * object);
|
|
|
|
void gst_mf_transform_set_new_sample_callback (GstMFTransform * object,
|
|
GstMFTransformNewSampleCallback callback,
|
|
gpointer user_data);
|
|
|
|
IMFActivate * gst_mf_transform_get_activate_handle (GstMFTransform * object);
|
|
|
|
IMFTransform * gst_mf_transform_get_transform_handle (GstMFTransform * object);
|
|
|
|
ICodecAPI * gst_mf_transform_get_codec_api_handle (GstMFTransform * object);
|
|
|
|
gboolean gst_mf_transform_process_input (GstMFTransform * object,
|
|
IMFSample * sample);
|
|
|
|
GstFlowReturn gst_mf_transform_get_output (GstMFTransform * object,
|
|
IMFSample ** sample);
|
|
|
|
gboolean gst_mf_transform_flush (GstMFTransform * object);
|
|
|
|
gboolean gst_mf_transform_drain (GstMFTransform * object);
|
|
|
|
gboolean gst_mf_transform_get_input_available_types (GstMFTransform * object,
|
|
GList ** input_types);
|
|
|
|
gboolean gst_mf_transform_get_output_available_types (GstMFTransform * object,
|
|
GList ** output_types);
|
|
|
|
gboolean gst_mf_transform_set_input_type (GstMFTransform * object,
|
|
IMFMediaType * input_type);
|
|
|
|
gboolean gst_mf_transform_set_output_type (GstMFTransform * object,
|
|
IMFMediaType * output_type);
|
|
|
|
gboolean gst_mf_transform_get_input_current_type (GstMFTransform * object,
|
|
IMFMediaType ** input_type);
|
|
|
|
gboolean gst_mf_transform_get_output_current_type (GstMFTransform * object,
|
|
IMFMediaType ** output_type);
|
|
|
|
gboolean gst_mf_transform_set_codec_api_uint32 (GstMFTransform * object,
|
|
const GUID * api,
|
|
guint32 value);
|
|
|
|
gboolean gst_mf_transform_set_codec_api_uint64 (GstMFTransform * object,
|
|
const GUID * api,
|
|
guint64 value);
|
|
|
|
gboolean gst_mf_transform_set_codec_api_boolean (GstMFTransform * object,
|
|
const GUID * api,
|
|
gboolean value);
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __GST_MF_TRANSFORM_OBJECT_H__ */ |