mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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c98ad6f249
As per MS documentation[1], it requires Windows 10 Build 20348 but it seems to be supported by old versions too [1] https://learn.microsoft.com/en-us/windows/win32/api/audioclientactivationparams/ ns-audioclientactivationparams-audioclient_process_loopback_params Fixes: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/2524 Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4505>
565 lines
18 KiB
C
565 lines
18 KiB
C
/*
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* Copyright (C) 2008 Ole André Vadla Ravnås <ole.andre.ravnas@tandberg.com>
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* Copyright (C) 2018 Centricular Ltd.
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* Author: Nirbheek Chauhan <nirbheek@centricular.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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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "gstwasapi2util.h"
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#include <audioclient.h>
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#include <mmdeviceapi.h>
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#include <winternl.h>
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GST_DEBUG_CATEGORY_EXTERN (gst_wasapi2_debug);
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#define GST_CAT_DEFAULT gst_wasapi2_debug
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/* Desktop only defines */
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#ifndef KSAUDIO_SPEAKER_MONO
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#define KSAUDIO_SPEAKER_MONO (SPEAKER_FRONT_CENTER)
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#endif
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#ifndef KSAUDIO_SPEAKER_1POINT1
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#define KSAUDIO_SPEAKER_1POINT1 (SPEAKER_FRONT_CENTER | SPEAKER_LOW_FREQUENCY)
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#endif
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#ifndef KSAUDIO_SPEAKER_STEREO
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#define KSAUDIO_SPEAKER_STEREO (SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT)
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#endif
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#ifndef KSAUDIO_SPEAKER_2POINT1
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#define KSAUDIO_SPEAKER_2POINT1 (SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT | SPEAKER_LOW_FREQUENCY)
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#endif
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#ifndef KSAUDIO_SPEAKER_3POINT0
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#define KSAUDIO_SPEAKER_3POINT0 (SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT | SPEAKER_FRONT_CENTER)
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#endif
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#ifndef KSAUDIO_SPEAKER_3POINT1
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#define KSAUDIO_SPEAKER_3POINT1 (SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT | \
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SPEAKER_FRONT_CENTER | SPEAKER_LOW_FREQUENCY)
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#endif
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#ifndef KSAUDIO_SPEAKER_QUAD
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#define KSAUDIO_SPEAKER_QUAD (SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT | \
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SPEAKER_BACK_LEFT | SPEAKER_BACK_RIGHT)
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#endif
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#define KSAUDIO_SPEAKER_SURROUND (SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT | \
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SPEAKER_FRONT_CENTER | SPEAKER_BACK_CENTER)
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#ifndef KSAUDIO_SPEAKER_5POINT0
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#define KSAUDIO_SPEAKER_5POINT0 (SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT | SPEAKER_FRONT_CENTER | \
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SPEAKER_SIDE_LEFT | SPEAKER_SIDE_RIGHT)
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#endif
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#define KSAUDIO_SPEAKER_5POINT1 (SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT | \
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SPEAKER_FRONT_CENTER | SPEAKER_LOW_FREQUENCY | \
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SPEAKER_BACK_LEFT | SPEAKER_BACK_RIGHT)
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#ifndef KSAUDIO_SPEAKER_7POINT0
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#define KSAUDIO_SPEAKER_7POINT0 (SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT | SPEAKER_FRONT_CENTER | \
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SPEAKER_BACK_LEFT | SPEAKER_BACK_RIGHT | \
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SPEAKER_SIDE_LEFT | SPEAKER_SIDE_RIGHT)
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#endif
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#ifndef KSAUDIO_SPEAKER_7POINT1
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#define KSAUDIO_SPEAKER_7POINT1 (SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT | \
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SPEAKER_FRONT_CENTER | SPEAKER_LOW_FREQUENCY | \
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SPEAKER_BACK_LEFT | SPEAKER_BACK_RIGHT | \
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SPEAKER_FRONT_LEFT_OF_CENTER | SPEAKER_FRONT_RIGHT_OF_CENTER)
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#endif
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/* *INDENT-OFF* */
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static struct
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{
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guint64 wasapi_pos;
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GstAudioChannelPosition gst_pos;
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} wasapi_to_gst_pos[] = {
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{SPEAKER_FRONT_LEFT, GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT},
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{SPEAKER_FRONT_RIGHT, GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT},
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{SPEAKER_FRONT_CENTER, GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER},
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{SPEAKER_LOW_FREQUENCY, GST_AUDIO_CHANNEL_POSITION_LFE1},
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{SPEAKER_BACK_LEFT, GST_AUDIO_CHANNEL_POSITION_REAR_LEFT},
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{SPEAKER_BACK_RIGHT, GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT},
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{SPEAKER_FRONT_LEFT_OF_CENTER,
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GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER},
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{SPEAKER_FRONT_RIGHT_OF_CENTER,
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GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER},
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{SPEAKER_BACK_CENTER, GST_AUDIO_CHANNEL_POSITION_REAR_CENTER},
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/* Enum values diverge from this point onwards */
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{SPEAKER_SIDE_LEFT, GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT},
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{SPEAKER_SIDE_RIGHT, GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT},
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{SPEAKER_TOP_CENTER, GST_AUDIO_CHANNEL_POSITION_TOP_CENTER},
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{SPEAKER_TOP_FRONT_LEFT, GST_AUDIO_CHANNEL_POSITION_TOP_FRONT_LEFT},
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{SPEAKER_TOP_FRONT_CENTER, GST_AUDIO_CHANNEL_POSITION_TOP_FRONT_CENTER},
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{SPEAKER_TOP_FRONT_RIGHT, GST_AUDIO_CHANNEL_POSITION_TOP_FRONT_RIGHT},
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{SPEAKER_TOP_BACK_LEFT, GST_AUDIO_CHANNEL_POSITION_TOP_REAR_LEFT},
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{SPEAKER_TOP_BACK_CENTER, GST_AUDIO_CHANNEL_POSITION_TOP_REAR_CENTER},
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{SPEAKER_TOP_BACK_RIGHT, GST_AUDIO_CHANNEL_POSITION_TOP_REAR_RIGHT}
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};
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static DWORD default_ch_masks[] = {
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0,
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KSAUDIO_SPEAKER_MONO,
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/* 2ch */
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KSAUDIO_SPEAKER_STEREO,
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/* 2.1ch */
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/* KSAUDIO_SPEAKER_3POINT0 ? */
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KSAUDIO_SPEAKER_2POINT1,
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/* 4ch */
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/* KSAUDIO_SPEAKER_3POINT1 or KSAUDIO_SPEAKER_SURROUND ? */
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KSAUDIO_SPEAKER_QUAD,
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/* 5ch */
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KSAUDIO_SPEAKER_5POINT0,
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/* 5.1ch */
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KSAUDIO_SPEAKER_5POINT1,
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/* 7ch */
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KSAUDIO_SPEAKER_7POINT0,
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/* 7.1ch */
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KSAUDIO_SPEAKER_7POINT1,
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};
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/* *INDENT-ON* */
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static const gchar *
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hresult_to_string_fallback (HRESULT hr)
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{
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const gchar *s = "unknown error";
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switch (hr) {
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case AUDCLNT_E_NOT_INITIALIZED:
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s = "AUDCLNT_E_NOT_INITIALIZED";
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break;
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case AUDCLNT_E_ALREADY_INITIALIZED:
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s = "AUDCLNT_E_ALREADY_INITIALIZED";
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break;
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case AUDCLNT_E_WRONG_ENDPOINT_TYPE:
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s = "AUDCLNT_E_WRONG_ENDPOINT_TYPE";
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break;
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case AUDCLNT_E_DEVICE_INVALIDATED:
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s = "AUDCLNT_E_DEVICE_INVALIDATED";
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break;
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case AUDCLNT_E_NOT_STOPPED:
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s = "AUDCLNT_E_NOT_STOPPED";
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break;
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case AUDCLNT_E_BUFFER_TOO_LARGE:
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s = "AUDCLNT_E_BUFFER_TOO_LARGE";
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break;
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case AUDCLNT_E_OUT_OF_ORDER:
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s = "AUDCLNT_E_OUT_OF_ORDER";
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break;
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case AUDCLNT_E_UNSUPPORTED_FORMAT:
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s = "AUDCLNT_E_UNSUPPORTED_FORMAT";
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break;
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case AUDCLNT_E_INVALID_DEVICE_PERIOD:
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s = "AUDCLNT_E_INVALID_DEVICE_PERIOD";
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break;
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case AUDCLNT_E_INVALID_SIZE:
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s = "AUDCLNT_E_INVALID_SIZE";
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break;
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case AUDCLNT_E_DEVICE_IN_USE:
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s = "AUDCLNT_E_DEVICE_IN_USE";
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break;
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case AUDCLNT_E_BUFFER_OPERATION_PENDING:
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s = "AUDCLNT_E_BUFFER_OPERATION_PENDING";
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break;
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case AUDCLNT_E_BUFFER_SIZE_ERROR:
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s = "AUDCLNT_E_BUFFER_SIZE_ERROR";
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break;
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case AUDCLNT_E_BUFFER_SIZE_NOT_ALIGNED:
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s = "AUDCLNT_E_BUFFER_SIZE_NOT_ALIGNED";
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break;
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case AUDCLNT_E_THREAD_NOT_REGISTERED:
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s = "AUDCLNT_E_THREAD_NOT_REGISTERED";
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break;
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case AUDCLNT_E_EXCLUSIVE_MODE_NOT_ALLOWED:
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s = "AUDCLNT_E_EXCLUSIVE_MODE_NOT_ALLOWED";
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break;
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case AUDCLNT_E_ENDPOINT_CREATE_FAILED:
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s = "AUDCLNT_E_ENDPOINT_CREATE_FAILED";
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break;
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case AUDCLNT_E_SERVICE_NOT_RUNNING:
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s = "AUDCLNT_E_SERVICE_NOT_RUNNING";
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break;
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case AUDCLNT_E_EVENTHANDLE_NOT_EXPECTED:
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s = "AUDCLNT_E_EVENTHANDLE_NOT_EXPECTED";
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break;
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case AUDCLNT_E_EXCLUSIVE_MODE_ONLY:
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s = "AUDCLNT_E_EXCLUSIVE_MODE_ONLY";
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break;
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case AUDCLNT_E_BUFDURATION_PERIOD_NOT_EQUAL:
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s = "AUDCLNT_E_BUFDURATION_PERIOD_NOT_EQUAL";
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break;
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case AUDCLNT_E_EVENTHANDLE_NOT_SET:
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s = "AUDCLNT_E_EVENTHANDLE_NOT_SET";
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break;
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case AUDCLNT_E_INCORRECT_BUFFER_SIZE:
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s = "AUDCLNT_E_INCORRECT_BUFFER_SIZE";
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break;
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case AUDCLNT_E_CPUUSAGE_EXCEEDED:
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s = "AUDCLNT_E_CPUUSAGE_EXCEEDED";
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break;
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case AUDCLNT_S_BUFFER_EMPTY:
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s = "AUDCLNT_S_BUFFER_EMPTY";
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break;
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case AUDCLNT_S_THREAD_ALREADY_REGISTERED:
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s = "AUDCLNT_S_THREAD_ALREADY_REGISTERED";
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break;
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case AUDCLNT_S_POSITION_STALLED:
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s = "AUDCLNT_S_POSITION_STALLED";
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break;
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case E_POINTER:
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s = "E_POINTER";
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break;
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case E_INVALIDARG:
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s = "E_INVALIDARG";
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break;
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}
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return s;
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}
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gchar *
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gst_wasapi2_util_get_error_message (HRESULT hr)
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{
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gchar *error_text = NULL;
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error_text = g_win32_error_message ((gint) hr);
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if (!error_text || strlen (error_text) == 0) {
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g_free (error_text);
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error_text = g_strdup (hresult_to_string_fallback (hr));
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}
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return error_text;
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}
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gboolean
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_gst_wasapi2_result (HRESULT hr, GstDebugCategory * cat, const gchar * file,
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const gchar * function, gint line)
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{
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#ifndef GST_DISABLE_GST_DEBUG
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gboolean ret = TRUE;
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if (FAILED (hr)) {
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gchar *error_text = NULL;
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gboolean free_string = TRUE;
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error_text = g_win32_error_message ((gint) hr);
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/* g_win32_error_message() seems to be returning empty string for
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* AUDCLNT_* cases */
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if (!error_text || strlen (error_text) == 0) {
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g_free (error_text);
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error_text = (gchar *) hresult_to_string_fallback (hr);
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free_string = FALSE;
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}
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gst_debug_log (cat, GST_LEVEL_WARNING, file, function, line,
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NULL, "WASAPI call failed: 0x%x, %s", (guint) hr, error_text);
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if (free_string)
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g_free (error_text);
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ret = FALSE;
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}
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return ret;
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#else
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return SUCCEEDED (hr);
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#endif
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}
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static void
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gst_wasapi_util_channel_position_all_none (guint channels,
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GstAudioChannelPosition * position)
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{
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guint i;
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for (i = 0; i < channels; i++)
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position[i] = GST_AUDIO_CHANNEL_POSITION_NONE;
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}
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guint64
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gst_wasapi2_util_waveformatex_to_channel_mask (WAVEFORMATEX * format,
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GstAudioChannelPosition ** out_position)
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{
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guint i, ch;
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guint64 mask = 0;
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GstAudioChannelPosition *pos = NULL;
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WORD nChannels = 0;
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DWORD dwChannelMask = 0;
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nChannels = format->nChannels;
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if (format->wFormatTag == WAVE_FORMAT_EXTENSIBLE) {
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WAVEFORMATEXTENSIBLE *extensible = (WAVEFORMATEXTENSIBLE *) format;
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dwChannelMask = extensible->dwChannelMask;
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}
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if (out_position)
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*out_position = NULL;
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if (nChannels > 2 && !dwChannelMask) {
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GST_WARNING ("Unknown channel mask value for %d channel stream", nChannels);
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if (nChannels >= G_N_ELEMENTS (default_ch_masks)) {
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GST_ERROR ("To may channels %d", nChannels);
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return 0;
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}
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dwChannelMask = default_ch_masks[nChannels];
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}
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pos = g_new (GstAudioChannelPosition, nChannels);
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gst_wasapi_util_channel_position_all_none (nChannels, pos);
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/* Too many channels, have to assume that they are all non-positional */
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if (nChannels > G_N_ELEMENTS (wasapi_to_gst_pos)) {
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GST_INFO ("Got too many (%i) channels, assuming non-positional", nChannels);
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goto out;
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}
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/* Too many bits in the channel mask, and the bits don't match nChannels */
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if (dwChannelMask >> (G_N_ELEMENTS (wasapi_to_gst_pos) + 1) != 0) {
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GST_WARNING ("Too many bits in channel mask (%lu), assuming "
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"non-positional", dwChannelMask);
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goto out;
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}
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/* Map WASAPI's channel mask to Gstreamer's channel mask and positions.
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* If the no. of bits in the mask > nChannels, we will ignore the extra. */
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for (i = 0, ch = 0; i < G_N_ELEMENTS (wasapi_to_gst_pos) && ch < nChannels;
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i++) {
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if (!(dwChannelMask & wasapi_to_gst_pos[i].wasapi_pos))
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/* no match, try next */
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continue;
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mask |= G_GUINT64_CONSTANT (1) << wasapi_to_gst_pos[i].gst_pos;
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pos[ch++] = wasapi_to_gst_pos[i].gst_pos;
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}
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/* XXX: Warn if some channel masks couldn't be mapped? */
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GST_DEBUG ("Converted WASAPI mask 0x%" G_GINT64_MODIFIER "x -> 0x%"
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G_GINT64_MODIFIER "x", (guint64) dwChannelMask, (guint64) mask);
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out:
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if (out_position) {
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*out_position = pos;
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} else {
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g_free (pos);
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}
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return mask;
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}
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const gchar *
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gst_wasapi2_util_waveformatex_to_audio_format (WAVEFORMATEX * format)
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{
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const gchar *fmt_str = NULL;
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GstAudioFormat fmt = GST_AUDIO_FORMAT_UNKNOWN;
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switch (format->wFormatTag) {
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case WAVE_FORMAT_PCM:
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fmt = gst_audio_format_build_integer (TRUE, G_LITTLE_ENDIAN,
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format->wBitsPerSample, format->wBitsPerSample);
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break;
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case WAVE_FORMAT_IEEE_FLOAT:
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if (format->wBitsPerSample == 32)
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fmt = GST_AUDIO_FORMAT_F32LE;
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else if (format->wBitsPerSample == 64)
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fmt = GST_AUDIO_FORMAT_F64LE;
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break;
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case WAVE_FORMAT_EXTENSIBLE:
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{
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WAVEFORMATEXTENSIBLE *ex = (WAVEFORMATEXTENSIBLE *) format;
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if (IsEqualGUID (&ex->SubFormat, &KSDATAFORMAT_SUBTYPE_PCM)) {
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fmt = gst_audio_format_build_integer (TRUE, G_LITTLE_ENDIAN,
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format->wBitsPerSample, ex->Samples.wValidBitsPerSample);
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} else if (IsEqualGUID (&ex->SubFormat, &KSDATAFORMAT_SUBTYPE_IEEE_FLOAT)) {
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if (format->wBitsPerSample == 32
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&& ex->Samples.wValidBitsPerSample == 32)
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fmt = GST_AUDIO_FORMAT_F32LE;
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else if (format->wBitsPerSample == 64 &&
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ex->Samples.wValidBitsPerSample == 64)
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fmt = GST_AUDIO_FORMAT_F64LE;
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}
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break;
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}
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default:
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break;
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}
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if (fmt != GST_AUDIO_FORMAT_UNKNOWN)
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fmt_str = gst_audio_format_to_string (fmt);
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return fmt_str;
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}
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gboolean
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gst_wasapi2_util_parse_waveformatex (WAVEFORMATEX * format,
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GstCaps * template_caps, GstCaps ** out_caps,
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GstAudioChannelPosition ** out_positions)
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{
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const gchar *afmt;
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guint64 channel_mask;
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*out_caps = NULL;
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/* TODO: handle SPDIF and other encoded formats */
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/* 1 or 2 channels <= 16 bits sample size OR
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* 1 or 2 channels > 16 bits sample size or >2 channels */
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if (format->wFormatTag != WAVE_FORMAT_PCM &&
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format->wFormatTag != WAVE_FORMAT_IEEE_FLOAT &&
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format->wFormatTag != WAVE_FORMAT_EXTENSIBLE)
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/* Unhandled format tag */
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return FALSE;
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/* WASAPI can only tell us one canonical mix format that it will accept. The
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* alternative is calling IsFormatSupported on all combinations of formats.
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* Instead, it's simpler and faster to require conversion inside gstreamer */
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afmt = gst_wasapi2_util_waveformatex_to_audio_format (format);
|
|
if (afmt == NULL)
|
|
return FALSE;
|
|
|
|
*out_caps = gst_caps_copy (template_caps);
|
|
|
|
channel_mask = gst_wasapi2_util_waveformatex_to_channel_mask (format,
|
|
out_positions);
|
|
|
|
gst_caps_set_simple (*out_caps,
|
|
"format", G_TYPE_STRING, afmt,
|
|
"channels", G_TYPE_INT, format->nChannels,
|
|
"rate", G_TYPE_INT, format->nSamplesPerSec, NULL);
|
|
|
|
if (channel_mask) {
|
|
gst_caps_set_simple (*out_caps,
|
|
"channel-mask", GST_TYPE_BITMASK, channel_mask, NULL);
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
gboolean
|
|
gst_wasapi2_can_automatic_stream_routing (void)
|
|
{
|
|
#ifdef GST_WASAPI2_WINAPI_ONLY_APP
|
|
/* Assume we are on very recent OS */
|
|
return TRUE;
|
|
#else
|
|
static gboolean ret = FALSE;
|
|
static gsize version_once = 0;
|
|
|
|
if (g_once_init_enter (&version_once)) {
|
|
OSVERSIONINFOEXW osverinfo;
|
|
typedef NTSTATUS (WINAPI fRtlGetVersion) (PRTL_OSVERSIONINFOEXW);
|
|
fRtlGetVersion *RtlGetVersion = NULL;
|
|
HMODULE hmodule = NULL;
|
|
|
|
memset (&osverinfo, 0, sizeof (OSVERSIONINFOEXW));
|
|
osverinfo.dwOSVersionInfoSize = sizeof (OSVERSIONINFOEXW);
|
|
|
|
hmodule = LoadLibraryW (L"ntdll.dll");
|
|
if (hmodule)
|
|
RtlGetVersion =
|
|
(fRtlGetVersion *) GetProcAddress (hmodule, "RtlGetVersion");
|
|
|
|
if (RtlGetVersion) {
|
|
RtlGetVersion (&osverinfo);
|
|
|
|
/* automatic stream routing requires Windows 10
|
|
* Anniversary Update (version 1607, build number 14393.0) */
|
|
if (osverinfo.dwMajorVersion > 10 ||
|
|
(osverinfo.dwMajorVersion == 10 && osverinfo.dwBuildNumber >= 14393))
|
|
ret = TRUE;
|
|
}
|
|
|
|
if (hmodule)
|
|
FreeLibrary (hmodule);
|
|
|
|
g_once_init_leave (&version_once, 1);
|
|
}
|
|
|
|
GST_INFO ("Automatic stream routing support: %d", ret);
|
|
|
|
return ret;
|
|
#endif
|
|
}
|
|
|
|
gboolean
|
|
gst_wasapi2_can_process_loopback (void)
|
|
{
|
|
#ifdef GST_WASAPI2_WINAPI_ONLY_APP
|
|
/* FIXME: Needs WinRT (Windows.System.Profile) API call
|
|
* for OS version check */
|
|
return FALSE;
|
|
#else
|
|
static gboolean ret = FALSE;
|
|
static gsize version_once = 0;
|
|
|
|
if (g_once_init_enter (&version_once)) {
|
|
OSVERSIONINFOEXW osverinfo;
|
|
typedef NTSTATUS (WINAPI fRtlGetVersion) (PRTL_OSVERSIONINFOEXW);
|
|
fRtlGetVersion *RtlGetVersion = NULL;
|
|
HMODULE hmodule = NULL;
|
|
|
|
memset (&osverinfo, 0, sizeof (OSVERSIONINFOEXW));
|
|
osverinfo.dwOSVersionInfoSize = sizeof (OSVERSIONINFOEXW);
|
|
|
|
hmodule = LoadLibraryW (L"ntdll.dll");
|
|
if (hmodule)
|
|
RtlGetVersion =
|
|
(fRtlGetVersion *) GetProcAddress (hmodule, "RtlGetVersion");
|
|
|
|
if (RtlGetVersion) {
|
|
RtlGetVersion (&osverinfo);
|
|
|
|
/* Process loopback requires Windows 10 build 20348
|
|
* https://learn.microsoft.com/en-us/windows/win32/api/audioclientactivationparams/ns-audioclientactivationparams-audioclient_process_loopback_params
|
|
*
|
|
* Note: "Windows 10 build 20348" would mean "Windows server 2022" or
|
|
* "Windows 11", since build number of "Windows 10 version 21H2" is
|
|
* still 19044.XXX
|
|
*/
|
|
|
|
/* But other software enables this for build number 19041 or higher... */
|
|
if (osverinfo.dwMajorVersion > 10 ||
|
|
(osverinfo.dwMajorVersion == 10 && osverinfo.dwBuildNumber >= 19041))
|
|
ret = TRUE;
|
|
}
|
|
|
|
if (hmodule)
|
|
FreeLibrary (hmodule);
|
|
|
|
g_once_init_leave (&version_once, 1);
|
|
}
|
|
|
|
GST_INFO ("Process loopback support: %d", ret);
|
|
|
|
return ret;
|
|
#endif
|
|
}
|
|
|
|
WAVEFORMATEX *
|
|
gst_wasapi2_get_default_mix_format (void)
|
|
{
|
|
WAVEFORMATEX *format;
|
|
|
|
/* virtual loopback device might not provide mix format. Create our default
|
|
* mix format */
|
|
format = CoTaskMemAlloc (sizeof (WAVEFORMATEX));
|
|
format->wFormatTag = WAVE_FORMAT_PCM;
|
|
format->nChannels = 2;
|
|
format->nSamplesPerSec = 44100;
|
|
format->wBitsPerSample = 16;
|
|
format->nBlockAlign = format->nChannels * format->wBitsPerSample / 8;
|
|
format->nAvgBytesPerSec = format->nSamplesPerSec * format->nBlockAlign;
|
|
|
|
return format;
|
|
}
|