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https://github.com/gnif/LookingGlass.git
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[client] windows: add WASAPI audio support
This commit is contained in:
Geoffrey McRae
210
client/audiodevs/WASAPI/format.c
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210
client/audiodevs/WASAPI/format.c
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/**
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* Looking Glass
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* Copyright © 2017-2026 The Looking Glass Authors
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* https://looking-glass.io
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc., 59
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* Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "format.h"
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#include <limits.h>
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#define WASAPI_TICKS_PER_SECOND UINT64_C(10000000)
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#define WASAPI_SPEAKER_FRONT_LEFT UINT32_C(0x00000001)
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#define WASAPI_SPEAKER_FRONT_RIGHT UINT32_C(0x00000002)
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#define WASAPI_SPEAKER_FRONT_CENTER UINT32_C(0x00000004)
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#define WASAPI_SPEAKER_LOW_FREQUENCY UINT32_C(0x00000008)
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#define WASAPI_SPEAKER_BACK_LEFT UINT32_C(0x00000010)
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#define WASAPI_SPEAKER_BACK_RIGHT UINT32_C(0x00000020)
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#define WASAPI_SPEAKER_FRONT_LEFT_OF_CENTER UINT32_C(0x00000040)
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#define WASAPI_SPEAKER_FRONT_RIGHT_OF_CENTER UINT32_C(0x00000080)
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#define WASAPI_SPEAKER_BACK_CENTER UINT32_C(0x00000100)
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#define WASAPI_SPEAKER_SIDE_LEFT UINT32_C(0x00000200)
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#define WASAPI_SPEAKER_SIDE_RIGHT UINT32_C(0x00000400)
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#define WASAPI_SPEAKER_TOP_CENTER UINT32_C(0x00000800)
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#define WASAPI_SPEAKER_TOP_FRONT_LEFT UINT32_C(0x00001000)
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#define WASAPI_SPEAKER_TOP_FRONT_CENTER UINT32_C(0x00002000)
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#define WASAPI_SPEAKER_TOP_FRONT_RIGHT UINT32_C(0x00004000)
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#define WASAPI_SPEAKER_TOP_BACK_LEFT UINT32_C(0x00008000)
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#define WASAPI_SPEAKER_TOP_BACK_CENTER UINT32_C(0x00010000)
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#define WASAPI_SPEAKER_TOP_BACK_RIGHT UINT32_C(0x00020000)
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void wasapi_controlPendingReset(WasapiControlPending * state)
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{
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*state = (WasapiControlPending) { 0 };
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}
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WasapiControlPending wasapi_controlPendingTake(WasapiControlPending * state)
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{
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const WasapiControlPending pending = *state;
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wasapi_controlPendingReset(state);
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return pending;
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}
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int wasapi_sampleSize(LG_AudioSampleFormat format)
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{
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switch (format)
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{
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case LG_AUDIO_FMT_U8 : return 1;
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case LG_AUDIO_FMT_S16_LE : return 2;
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case LG_AUDIO_FMT_S24_LE : return 3;
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case LG_AUDIO_FMT_S32_LE :
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case LG_AUDIO_FMT_F32_LE :
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case LG_AUDIO_FMT_F32_NE : return 4;
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case LG_AUDIO_FMT_F64_LE : return 8;
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}
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return 0;
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}
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static uint32_t wasapi_channelBit(LG_AudioChannel channel)
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{
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switch (channel)
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{
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case LG_AUDIO_CH_UNKNOWN : return 0;
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case LG_AUDIO_CH_MONO :
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case LG_AUDIO_CH_FRONT_CENTER :
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return WASAPI_SPEAKER_FRONT_CENTER;
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case LG_AUDIO_CH_FRONT_LEFT :
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return WASAPI_SPEAKER_FRONT_LEFT;
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case LG_AUDIO_CH_FRONT_RIGHT :
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return WASAPI_SPEAKER_FRONT_RIGHT;
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case LG_AUDIO_CH_LFE :
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return WASAPI_SPEAKER_LOW_FREQUENCY;
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case LG_AUDIO_CH_REAR_LEFT :
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return WASAPI_SPEAKER_BACK_LEFT;
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case LG_AUDIO_CH_REAR_RIGHT :
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return WASAPI_SPEAKER_BACK_RIGHT;
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case LG_AUDIO_CH_FRONT_LEFT_CENTER :
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return WASAPI_SPEAKER_FRONT_LEFT_OF_CENTER;
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case LG_AUDIO_CH_FRONT_RIGHT_CENTER :
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return WASAPI_SPEAKER_FRONT_RIGHT_OF_CENTER;
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case LG_AUDIO_CH_REAR_CENTER :
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return WASAPI_SPEAKER_BACK_CENTER;
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case LG_AUDIO_CH_SIDE_LEFT :
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return WASAPI_SPEAKER_SIDE_LEFT;
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case LG_AUDIO_CH_SIDE_RIGHT :
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return WASAPI_SPEAKER_SIDE_RIGHT;
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case LG_AUDIO_CH_TOP_CENTER :
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return WASAPI_SPEAKER_TOP_CENTER;
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case LG_AUDIO_CH_TOP_FRONT_LEFT :
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return WASAPI_SPEAKER_TOP_FRONT_LEFT;
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case LG_AUDIO_CH_TOP_FRONT_CENTER :
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return WASAPI_SPEAKER_TOP_FRONT_CENTER;
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case LG_AUDIO_CH_TOP_FRONT_RIGHT :
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return WASAPI_SPEAKER_TOP_FRONT_RIGHT;
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case LG_AUDIO_CH_TOP_REAR_LEFT :
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return WASAPI_SPEAKER_TOP_BACK_LEFT;
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case LG_AUDIO_CH_TOP_REAR_CENTER :
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return WASAPI_SPEAKER_TOP_BACK_CENTER;
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case LG_AUDIO_CH_TOP_REAR_RIGHT :
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return WASAPI_SPEAKER_TOP_BACK_RIGHT;
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}
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return 0;
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}
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uint32_t wasapi_channelMask(const LG_AudioFormat * format)
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{
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if (!format || !format->channelCount ||
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format->channelCount > LG_AUDIO_MAX_CHANNELS)
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return 0;
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if (format->channelCount == 1 &&
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format->channels[0] == LG_AUDIO_CH_MONO)
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return WASAPI_SPEAKER_FRONT_CENTER;
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uint32_t mask = 0;
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uint32_t lastBit = 0;
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for (uint8_t i = 0; i < format->channelCount; ++i)
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{
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if (format->channels[i] == LG_AUDIO_CH_MONO)
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return 0;
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const uint32_t bit = wasapi_channelBit(format->channels[i]);
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if (!bit || bit <= lastBit)
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return 0;
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mask |= bit;
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lastBit = bit;
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}
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return mask;
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}
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bool wasapi_formatInfo(const LG_AudioFormat * format,
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WasapiFormatInfo * info)
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{
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if (!format || !info || !format->sampleRate || !format->channelCount ||
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format->channelCount > LG_AUDIO_MAX_CHANNELS)
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return false;
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const int sampleSize = wasapi_sampleSize(format->sampleFormat);
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const uint32_t channelMask = wasapi_channelMask(format);
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const uint32_t blockAlign = (uint32_t)sampleSize * format->channelCount;
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const uint64_t bytesPerSecond = (uint64_t)blockAlign * format->sampleRate;
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if (!sampleSize || !channelMask || blockAlign > UINT16_MAX ||
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bytesPerSecond > UINT32_MAX)
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return false;
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WasapiSampleType sampleType;
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switch (format->sampleFormat)
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{
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case LG_AUDIO_FMT_U8:
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case LG_AUDIO_FMT_S16_LE:
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case LG_AUDIO_FMT_S24_LE:
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case LG_AUDIO_FMT_S32_LE:
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sampleType = WASAPI_SAMPLE_TYPE_PCM;
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break;
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case LG_AUDIO_FMT_F32_LE:
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case LG_AUDIO_FMT_F64_LE:
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case LG_AUDIO_FMT_F32_NE:
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sampleType = WASAPI_SAMPLE_TYPE_FLOAT;
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break;
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default:
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return false;
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}
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info->blockAlign = (uint16_t)blockAlign;
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info->bytesPerSecond = (uint32_t)bytesPerSecond;
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info->bitsPerSample = (uint16_t)(sampleSize * CHAR_BIT);
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info->channelMask = channelMask;
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info->sampleType = sampleType;
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return true;
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}
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uint64_t wasapi_framesToDuration(uint32_t frames, uint32_t sampleRate)
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{
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if (!sampleRate)
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return 0;
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return ((uint64_t)frames * WASAPI_TICKS_PER_SECOND + sampleRate - 1) /
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sampleRate;
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}
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uint32_t wasapi_availableFrames(uint32_t bufferFrames,
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uint32_t paddingFrames)
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{
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return paddingFrames < bufferFrames ? bufferFrames - paddingFrames : 0;
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}
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uint8_t wasapi_silenceByte(LG_AudioSampleFormat format)
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{
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return format == LG_AUDIO_FMT_U8 ? UINT8_C(0x80) : UINT8_C(0);
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}
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