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pkv
e8e04a20c9
This adds: - an ASIO Input source, allowing audio capture of devices using Steinberg ASIO audio SDK on Windows. This allows low latency capture. - an ASIO output, which will allow routing audio from OBS to any ASIO device. A per channel routing is provided. The UI to setup the ASIO output is provided in a later commit. Signed-off-by: pkv <pkv@obsproject.com>
100 lines
4.9 KiB
C
100 lines
4.9 KiB
C
/******************************************************************************
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Copyright (C) 2022-2026 pkv <pkv@obsproject.com>
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This file is part of win-asio.
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It uses the Steinberg ASIO SDK, which is licensed under the GNU GPL v3.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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******************************************************************************/
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#include "asio-callbacks.h"
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#include "asio-device.h"
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/* ASIO callbacks are quite a pain because they don't store the 'this' pointer of the COM driver. In C++ we could do
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* some template tricks as done by JUCE. But in C, we're more restricted, hence the use of these macros.
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* The number of callback sets is the number of supported devices. So up to 16, which is plenty enough!
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*/
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#define DEFINE_CALLBACK_SET(N) \
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void buffer_switch_##N(long index, long directProcess) {{ \
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UNUSED_PARAMETER(directProcess); \
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if (current_asio_devices[N]) { \
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asio_device_callback(current_asio_devices[N], index); } \
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}} \
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ASIOTime* buffer_switch_time_info_##N(ASIOTime* params, long index, long directProcess) {{ \
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UNUSED_PARAMETER(params); \
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UNUSED_PARAMETER(directProcess); \
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if (current_asio_devices[N]) { \
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struct asio_device *dev = current_asio_devices[N]; \
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if (!os_atomic_load_bool(&dev->called_back)) { \
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warn("Driver called bufferSwitchTimeInfo despite unsupported time info; using compatibility processing."); \
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} \
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asio_device_callback(dev, index); } \
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return NULL; \
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}} \
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long asio_message_callback_##N(long selector, long value, void* message, double* opt) {{ \
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if (current_asio_devices[N]) { \
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return asio_device_asio_message_callback(current_asio_devices[N], selector, value, message, opt); } \
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return 0; \
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}} \
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void sample_rate_changed_callback_##N(ASIOSampleRate rate) {{ \
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struct asio_device *dev = current_asio_devices[N]; \
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if (!dev) { \
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return; \
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} \
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if (rate == dev->current_sample_rate) { \
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return; \
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} \
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if (rate > 0.0) { \
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dev->current_sample_rate = rate; \
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} \
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asio_device_reset_request(dev); \
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}}
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DEFINE_CALLBACK_SET(0)
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DEFINE_CALLBACK_SET(1)
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DEFINE_CALLBACK_SET(2)
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DEFINE_CALLBACK_SET(3)
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DEFINE_CALLBACK_SET(4)
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DEFINE_CALLBACK_SET(5)
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DEFINE_CALLBACK_SET(6)
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DEFINE_CALLBACK_SET(7)
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DEFINE_CALLBACK_SET(8)
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DEFINE_CALLBACK_SET(9)
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DEFINE_CALLBACK_SET(10)
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DEFINE_CALLBACK_SET(11)
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DEFINE_CALLBACK_SET(12)
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DEFINE_CALLBACK_SET(13)
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DEFINE_CALLBACK_SET(14)
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DEFINE_CALLBACK_SET(15)
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const struct asio_callback_set callback_sets[MAX_NUM_ASIO_DEVICES] = {
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{buffer_switch_0, buffer_switch_time_info_0, asio_message_callback_0, sample_rate_changed_callback_0},
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{buffer_switch_1, buffer_switch_time_info_1, asio_message_callback_1, sample_rate_changed_callback_1},
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{buffer_switch_2, buffer_switch_time_info_2, asio_message_callback_2, sample_rate_changed_callback_2},
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{buffer_switch_3, buffer_switch_time_info_3, asio_message_callback_3, sample_rate_changed_callback_3},
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{buffer_switch_4, buffer_switch_time_info_4, asio_message_callback_4, sample_rate_changed_callback_4},
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{buffer_switch_5, buffer_switch_time_info_5, asio_message_callback_5, sample_rate_changed_callback_5},
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{buffer_switch_6, buffer_switch_time_info_6, asio_message_callback_6, sample_rate_changed_callback_6},
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{buffer_switch_7, buffer_switch_time_info_7, asio_message_callback_7, sample_rate_changed_callback_7},
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{buffer_switch_8, buffer_switch_time_info_8, asio_message_callback_8, sample_rate_changed_callback_8},
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{buffer_switch_9, buffer_switch_time_info_9, asio_message_callback_9, sample_rate_changed_callback_9},
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{buffer_switch_10, buffer_switch_time_info_10, asio_message_callback_10, sample_rate_changed_callback_10},
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{buffer_switch_11, buffer_switch_time_info_11, asio_message_callback_11, sample_rate_changed_callback_11},
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{buffer_switch_12, buffer_switch_time_info_12, asio_message_callback_12, sample_rate_changed_callback_12},
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{buffer_switch_13, buffer_switch_time_info_13, asio_message_callback_13, sample_rate_changed_callback_13},
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{buffer_switch_14, buffer_switch_time_info_14, asio_message_callback_14, sample_rate_changed_callback_14},
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{buffer_switch_15, buffer_switch_time_info_15, asio_message_callback_15, sample_rate_changed_callback_15},
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};
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