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When B-frame is enabled, encoder seems to adjust PTS of encoded sample by using frame duration. For instance, one observed timestamp pattern by using B-frame enabled and 30fps stream is: * Frame-1: MF pts 0:00.033333300 MF dts 0:00.000000000 * Frame-2: MF pts 0:00.133333300 MF dts 0:00.033333300 * Frame-3: MF pts 0:00.066666600 MF dts 0:00.066666600 * Frame-4: MF pts 0:00.099999900 MF dts 0:00.100000000 We can notice that the amount of PTS shift is frame duration and Frame-4 exhibits PTS < DTS. To compensate shifted timestamp, we should calculate the timestamp offset and re-calculate DTS correspondingly. Otherwise, total timeline of output stream will be shifted, and that can cause time sync issue. Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2354>
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5 KiB
C
149 lines
No EOL
5 KiB
C
/* GStreamer
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* Copyright (C) 2020 Seungha Yang <seungha.yang@navercorp.com>
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* Copyright (C) 2020 Seungha Yang <seungha@centricular.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __GST_MF_VIDEO_ENC_H__
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#define __GST_MF_VIDEO_ENC_H__
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#include "gstmfconfig.h"
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#include <gst/gst.h>
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#include <gst/video/video.h>
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#include "gstmfutils.h"
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#include "gstmftransform.h"
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#if GST_MF_HAVE_D3D11
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#include <gst/d3d11/gstd3d11.h>
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#endif
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G_BEGIN_DECLS
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#define GST_TYPE_MF_VIDEO_ENC (gst_mf_video_enc_get_type())
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#define GST_MF_VIDEO_ENC(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_MF_VIDEO_ENC,GstMFVideoEnc))
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#define GST_MF_VIDEO_ENC_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass), GST_TYPE_MF_VIDEO_ENC,GstMFVideoEncClass))
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#define GST_MF_VIDEO_ENC_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj), GST_TYPE_MF_VIDEO_ENC,GstMFVideoEncClass))
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#define GST_IS_MF_VIDEO_ENC(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_MF_VIDEO_ENC))
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#define GST_IS_MF_VIDEO_ENC_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE((klass), GST_TYPE_MF_VIDEO_ENC))
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typedef struct _GstMFVideoEnc GstMFVideoEnc;
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typedef struct _GstMFVideoEncClass GstMFVideoEncClass;
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typedef struct _GstMFVideoEncDeviceCaps GstMFVideoEncDeviceCaps;
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typedef struct _GstMFVideoEncClassData GstMFVideoEncClassData;
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struct _GstMFVideoEncDeviceCaps
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{
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gboolean rc_mode; /* AVEncCommonRateControlMode */
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gboolean quality; /* AVEncCommonQuality */
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gboolean adaptive_mode; /* AVEncAdaptiveMode */
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gboolean buffer_size; /* AVEncCommonBufferSize */
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gboolean max_bitrate; /* AVEncCommonMaxBitRate */
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gboolean quality_vs_speed; /* AVEncCommonQualityVsSpeed */
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gboolean cabac; /* AVEncH264CABACEnable */
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gboolean sps_id; /* AVEncH264SPSID */
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gboolean pps_id; /* AVEncH264PPSID */
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gboolean bframes; /* AVEncMPVDefaultBPictureCount */
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gboolean gop_size; /* AVEncMPVGOPSize */
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gboolean threads; /* AVEncNumWorkerThreads */
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gboolean content_type; /* AVEncVideoContentType */
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gboolean qp; /* AVEncVideoEncodeQP */
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gboolean force_keyframe; /* AVEncVideoForceKeyFrame */
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gboolean low_latency; /* AVLowLatencyMode */
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gboolean min_qp; /* AVEncVideoMinQP */
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gboolean max_qp; /* AVEncVideoMaxQP */
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gboolean frame_type_qp; /* AVEncVideoEncodeFrameTypeQP */
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gboolean max_num_ref; /* AVEncVideoMaxNumRefFrame */
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guint max_num_ref_high;
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guint max_num_ref_low;
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/* TRUE if MFT support d3d11 and also we can use d3d11 interop */
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gboolean d3d11_aware;
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/* DXGI adapter index to use, ignored if d3d11-unaware */
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guint adapter;
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};
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struct _GstMFVideoEncClassData
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{
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GstCaps *sink_caps;
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GstCaps *src_caps;
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gchar *device_name;
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guint32 enum_flags;
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guint device_index;
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GstMFVideoEncDeviceCaps device_caps;
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gboolean is_default;
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};
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struct _GstMFVideoEnc
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{
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GstVideoEncoder parent;
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GstMFTransform *transform;
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gboolean async_mft;
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GstFlowReturn last_ret;
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GstVideoCodecState *input_state;
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/* Set by subclass */
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gboolean has_reorder_frame;
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/* Calculated timestamp offset in MF timescale (100ns scale)
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* when B-frame is enabled. */
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LONGLONG mf_pts_offset;
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#if GST_MF_HAVE_D3D11
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/* For D3D11 interop. */
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GstD3D11Device *other_d3d11_device;
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GstD3D11Device *d3d11_device;
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IMFDXGIDeviceManager *device_manager;
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UINT reset_token;
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IMFVideoSampleAllocatorEx *mf_allocator;
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#endif
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};
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struct _GstMFVideoEncClass
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{
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GstVideoEncoderClass parent_class;
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/* Set by subclass */
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GUID codec_id; /* Output subtype of MFT */
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guint32 enum_flags; /* MFT_ENUM_FLAG */
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guint device_index; /* Index of enumerated IMFActivate via MFTEnum */
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GstMFVideoEncDeviceCaps device_caps;
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gboolean (*set_option) (GstMFVideoEnc * mfenc,
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GstVideoCodecState * state,
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IMFMediaType * output_type);
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gboolean (*set_src_caps) (GstMFVideoEnc * mfenc,
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GstVideoCodecState * state,
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IMFMediaType * output_type);
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};
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GType gst_mf_video_enc_get_type (void);
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void gst_mf_video_enc_register (GstPlugin * plugin,
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guint rank,
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GUID * subtype,
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GTypeInfo * type_info,
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GList * d3d11_device);
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G_END_DECLS
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#endif /* __GST_MF_VIDEO_ENC_H__ */ |