Xash3D FWGS engine.
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/*
voice.c - voice chat implementation
Copyright (C) 2022 Velaron
Copyright (C) 2022 SNMetamorph
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
*/
#include <opus.h>
#include "common.h"
#include "client.h"
#include "voice.h"
static wavdata_t *input_file;
static fs_offset_t input_pos;
voice_state_t voice = { 0 };
CVAR_DEFINE_AUTO( voice_enable, "1", FCVAR_PRIVILEGED|FCVAR_ARCHIVE, "enable voice chat" );
CVAR_DEFINE_AUTO( voice_loopback, "0", FCVAR_PRIVILEGED, "loopback voice back to the speaker" );
CVAR_DEFINE_AUTO( voice_scale, "1.0", FCVAR_PRIVILEGED|FCVAR_ARCHIVE, "incoming voice volume scale" );
CVAR_DEFINE_AUTO( voice_avggain, "0.5", FCVAR_PRIVILEGED|FCVAR_ARCHIVE, "automatic voice gain control (average)" );
CVAR_DEFINE_AUTO( voice_maxgain, "5.0", FCVAR_PRIVILEGED|FCVAR_ARCHIVE, "automatic voice gain control (maximum)" );
CVAR_DEFINE_AUTO( voice_inputfromfile, "0", FCVAR_PRIVILEGED, "input voice from voice_input.wav" );
/*
===============================================================================
OPUS INTEGRATION
===============================================================================
*/
/*
=========================
Voice_GetBandwithTypeName
=========================
*/
static const char* Voice_GetBandwidthTypeName( int bandwidthType )
{
switch( bandwidthType )
{
case OPUS_BANDWIDTH_FULLBAND: return "Full Band (20 kHz)";
case OPUS_BANDWIDTH_SUPERWIDEBAND: return "Super Wide Band (12 kHz)";
case OPUS_BANDWIDTH_WIDEBAND: return "Wide Band (8 kHz)";
case OPUS_BANDWIDTH_MEDIUMBAND: return "Medium Band (6 kHz)";
case OPUS_BANDWIDTH_NARROWBAND: return "Narrow Band (4 kHz)";
default: return "Unknown";
}
}
/*
=========================
Voice_CodecInfo_f
=========================
*/
static void Voice_CodecInfo_f( void )
{
int encoderComplexity;
opus_int32 encoderBitrate;
opus_int32 encoderBandwidthType;
if( !voice.initialized )
{
Con_Printf( "Voice codec is not initialized!\n" );
return;
}
opus_encoder_ctl( voice.encoder, OPUS_GET_BITRATE( &encoderBitrate ));
opus_encoder_ctl( voice.encoder, OPUS_GET_COMPLEXITY( &encoderComplexity ));
opus_encoder_ctl( voice.encoder, OPUS_GET_BANDWIDTH( &encoderBandwidthType ));
Con_Printf( "Encoder:\n" );
Con_Printf( " Bitrate: %.3f kbps\n", encoderBitrate / 1000.0f );
Con_Printf( " Complexity: %d\n", encoderComplexity );
Con_Printf( " Bandwidth: %s\n", Voice_GetBandwidthTypeName( encoderBandwidthType ));
}
/*
=========================
Voice_GetFrameSize
=========================
*/
static uint Voice_GetFrameSize( float durationMsec )
{
return voice.channels * voice.width * (( float )voice.samplerate / ( 1000.0f / durationMsec ));
}
/*
=========================
Voice_ApplyGainAdjust
=========================
*/
static void Voice_ApplyGainAdjust( opus_int16 *samples, int count )
{
float gain, modifiedMax;
int average, adjustedSample;
int blockOffset = 0;
for( ;;)
{
int i;
int localMax = 0;
int localSum = 0;
int blockSize = Q_min( count - ( blockOffset + voice.autogain.block_size ), voice.autogain.block_size );
if( blockSize < 1 )
break;
for( i = 0; i < blockSize; ++i )
{
int sample = samples[blockOffset + i];
if( abs( sample ) > localMax ) {
localMax = abs( sample );
}
localSum += sample;
gain = voice.autogain.current_gain + i * voice.autogain.gain_multiplier;
adjustedSample = Q_min( 32767, Q_max(( int )( sample * gain ), -32768 ));
samples[blockOffset + i] = adjustedSample;
}
if( blockOffset % voice.autogain.block_size == 0 )
{
average = localSum / blockSize;
modifiedMax = average + ( localMax - average ) * voice_avggain.value;
voice.autogain.current_gain = voice.autogain.next_gain * voice_scale.value;
voice.autogain.next_gain = Q_min( 32767.0f / modifiedMax, voice_maxgain.value ) * voice_scale.value;
voice.autogain.gain_multiplier = ( voice.autogain.next_gain - voice.autogain.current_gain ) / ( voice.autogain.block_size - 1 );
}
blockOffset += blockSize;
}
}
/*
=========================
Voice_InitOpusDecoder
=========================
*/
static qboolean Voice_InitOpusDecoder( void )
{
int err;
voice.decoder = opus_decoder_create( voice.samplerate, voice.channels, &err );
if( !voice.decoder )
{
Con_Printf( S_ERROR "Can't create Opus encoder: %s", opus_strerror( err ));
return false;
}
return true;
}
/*
=========================
Voice_InitOpusEncoder
=========================
*/
static qboolean Voice_InitOpusEncoder( int quality )
{
int err;
int app = quality == 5 ? OPUS_APPLICATION_AUDIO : OPUS_APPLICATION_VOIP;
voice.encoder = opus_encoder_create( voice.samplerate, voice.channels, app, &err );
if( !voice.encoder )
{
Con_Printf( S_ERROR "Can't create Opus encoder: %s", opus_strerror( err ));
return false;
}
switch( quality )
{
case 1: // 6 kbps, <6 kHz bandwidth
opus_encoder_ctl( voice.encoder, OPUS_SET_BITRATE( 6000 ));
opus_encoder_ctl( voice.encoder, OPUS_SET_BANDWIDTH( OPUS_BANDWIDTH_MEDIUMBAND ));
break;
case 2: // 12 kbps, <12 kHz bandwidth
opus_encoder_ctl( voice.encoder, OPUS_SET_BITRATE( 12000 ));
opus_encoder_ctl( voice.encoder, OPUS_SET_BANDWIDTH( OPUS_BANDWIDTH_SUPERWIDEBAND ));
break;
case 4: // 64 kbps, full band (20 kHz)
opus_encoder_ctl( voice.encoder, OPUS_SET_BITRATE( 64000 ));
opus_encoder_ctl( voice.encoder, OPUS_SET_BANDWIDTH( OPUS_BANDWIDTH_FULLBAND ));
break;
case 5: // 96 kbps, full band (20 kHz)
opus_encoder_ctl( voice.encoder, OPUS_SET_BITRATE( 96000 ));
opus_encoder_ctl( voice.encoder, OPUS_SET_BANDWIDTH( OPUS_BANDWIDTH_FULLBAND ));
break;
default: // 36 kbps, <12 kHz bandwidth
opus_encoder_ctl( voice.encoder, OPUS_SET_BITRATE( 36000 ));
opus_encoder_ctl( voice.encoder, OPUS_SET_BANDWIDTH( OPUS_BANDWIDTH_SUPERWIDEBAND ));
break;
}
return true;
}
/*
=========================
Voice_ShutdownOpusDecoder
=========================
*/
static void Voice_ShutdownOpusDecoder( void )
{
if( voice.decoder )
{
opus_decoder_destroy( voice.decoder );
voice.decoder = NULL;
}
}
/*
=========================
Voice_ShutdownOpusEncoder
=========================
*/
static void Voice_ShutdownOpusEncoder( void )
{
if( voice.encoder )
{
opus_encoder_destroy( voice.encoder );
voice.encoder = NULL;
}
}
/*
=========================
Voice_GetOpusCompressedData
=========================
*/
static uint Voice_GetOpusCompressedData( byte *out, uint maxsize, uint *frames )
{
uint ofs, size = 0;
if( input_file )
{
uint numbytes;
double updateInterval;
updateInterval = cl.mtime[0] - cl.mtime[1];
numbytes = updateInterval * voice.samplerate * voice.width * voice.channels;
numbytes = Q_min( numbytes, input_file->size - input_pos );
numbytes = Q_min( numbytes, sizeof( voice.input_buffer ) - voice.input_buffer_pos );
memcpy( voice.input_buffer + voice.input_buffer_pos, input_file->buffer + input_pos, numbytes );
voice.input_buffer_pos += numbytes;
input_pos += numbytes;
}
for( ofs = 0; voice.input_buffer_pos - ofs >= voice.frame_size && ofs <= voice.input_buffer_pos; ofs += voice.frame_size )
{
int bytes;
if( !input_file )
{
// adjust gain before encoding, but only for input from voice
Voice_ApplyGainAdjust((opus_int16*)voice.input_buffer + ofs, voice.frame_size);
}
bytes = opus_encode( voice.encoder, (const opus_int16*)(voice.input_buffer + ofs), voice.frame_size / voice.width, out + size, maxsize );
memmove( voice.input_buffer, voice.input_buffer + voice.frame_size, sizeof( voice.input_buffer ) - voice.frame_size );
voice.input_buffer_pos -= voice.frame_size;
if( bytes > 0 )
{
size += bytes;
(*frames)++;
}
}
return size;
}
/*
===============================================================================
VOICE CHAT INTEGRATION
===============================================================================
*/
/*
=========================
Voice_Status
Notify user dll aboit voice transmission
=========================
*/
static void Voice_Status( int entindex, qboolean bTalking )
{
if( cls.state == ca_active && clgame.dllFuncs.pfnVoiceStatus )
clgame.dllFuncs.pfnVoiceStatus( entindex, bTalking );
}
/*
=========================
Voice_StatusTimeout
Waits few milliseconds and if there was no
voice transmission, sends notification
=========================
*/
static void Voice_StatusTimeout( voice_status_t *status, int entindex, double frametime )
{
if( status->talking_ack )
{
status->talking_timeout += frametime;
if( status->talking_timeout > 0.2 )
{
status->talking_ack = false;
Voice_Status( entindex, false );
}
}
}
/*
=========================
Voice_StatusAck
Sends notification to user dll and
zeroes timeouts for this client
=========================
*/
void Voice_StatusAck( voice_status_t *status, int playerIndex )
{
if( !status->talking_ack )
Voice_Status( playerIndex, true );
status->talking_ack = true;
status->talking_timeout = 0.0;
}
/*
=========================
Voice_IsRecording
=========================
*/
qboolean Voice_IsRecording( void )
{
return voice.is_recording;
}
/*
=========================
Voice_RecordStop
=========================
*/
void Voice_RecordStop( void )
{
if( input_file )
{
FS_FreeSound( input_file );
input_file = NULL;
}
voice.input_buffer_pos = 0;
memset( voice.input_buffer, 0, sizeof( voice.input_buffer ));
if( Voice_IsRecording( ))
Voice_Status( VOICE_LOCALCLIENT_INDEX, false );
VoiceCapture_RecordStop();
voice.is_recording = false;
}
/*
=========================
Voice_RecordStart
=========================
*/
void Voice_RecordStart( void )
{
Voice_RecordStop();
if( voice_inputfromfile.value )
{
input_file = FS_LoadSound( "voice_input.wav", NULL, 0 );
if( input_file )
{
Sound_Process( &input_file, voice.samplerate, voice.width, SOUND_RESAMPLE );
input_pos = 0;
voice.start_time = Sys_DoubleTime();
voice.is_recording = true;
}
else
{
FS_FreeSound( input_file );
input_file = NULL;
}
}
if( !Voice_IsRecording() )
voice.is_recording = VoiceCapture_RecordStart();
if( Voice_IsRecording() )
Voice_Status( VOICE_LOCALCLIENT_INDEX, true );
}
/*
=========================
Voice_Disconnect
We're disconnected from server
stop recording and notify user dlls
=========================
*/
void Voice_Disconnect( void )
{
int i;
Voice_RecordStop();
if( voice.local.talking_ack )
{
Voice_Status( VOICE_LOOPBACK_INDEX, false );
voice.local.talking_ack = false;
}
for( i = 0; i < MAX_CLIENTS; i++ )
{
if( voice.players_status[i].talking_ack )
{
Voice_Status( i, false );
voice.players_status[i].talking_ack = false;
}
}
}
/*
=========================
Voice_StartChannel
Feed the decoded data to engine sound subsystem
=========================
*/
static void Voice_StartChannel( uint samples, byte *data, int entnum )
{
SND_ForceInitMouth( entnum );
S_RawEntSamples( entnum, samples, voice.samplerate, voice.width, voice.channels, data, 255 );
}
/*
=========================
Voice_AddIncomingData
Received encoded voice data, decode it
=========================
*/
void Voice_AddIncomingData( int ent, const byte *data, uint size, uint frames )
{
int samples;
if( !voice.decoder )
return;
samples = opus_decode( voice.decoder, data, size, (short *)voice.decompress_buffer, voice.frame_size / voice.width * frames, false );
if( samples > 0 )
Voice_StartChannel( samples, voice.decompress_buffer, ent );
}
/*
=========================
CL_AddVoiceToDatagram
Encode our voice data and send it to server
=========================
*/
void CL_AddVoiceToDatagram( void )
{
uint size, frames = 0;
if( cls.state != ca_active || !Voice_IsRecording() || !voice.encoder )
return;
size = Voice_GetOpusCompressedData( voice.output_buffer, sizeof( voice.output_buffer ), &frames );
if( size > 0 && MSG_GetNumBytesLeft( &cls.datagram ) >= size + 32 )
{
MSG_BeginClientCmd( &cls.datagram, clc_voicedata );
MSG_WriteByte( &cls.datagram, voice_loopback.value != 0 );
MSG_WriteByte( &cls.datagram, frames );
MSG_WriteShort( &cls.datagram, size );
MSG_WriteBytes( &cls.datagram, voice.output_buffer, size );
}
}
/*
=========================
Voice_RegisterCvars
Register voice related cvars and commands
=========================
*/
void Voice_RegisterCvars( void )
{
Cvar_RegisterVariable( &voice_enable );
Cvar_RegisterVariable( &voice_loopback );
Cvar_RegisterVariable( &voice_scale );
Cvar_RegisterVariable( &voice_avggain );
Cvar_RegisterVariable( &voice_maxgain );
Cvar_RegisterVariable( &voice_inputfromfile );
Cmd_AddClientCommand( "voice_codecinfo", Voice_CodecInfo_f );
}
/*
=========================
Voice_Shutdown
Completely shutdown the voice subsystem
=========================
*/
static void Voice_Shutdown( void )
{
int i;
Voice_RecordStop();
Voice_ShutdownOpusEncoder();
Voice_ShutdownOpusDecoder();
VoiceCapture_Shutdown();
if( voice.local.talking_ack )
Voice_Status( VOICE_LOOPBACK_INDEX, false );
for( i = 0; i < MAX_CLIENTS; i++ )
{
if( voice.players_status[i].talking_ack )
Voice_Status( i, false );
}
memset( &voice, 0, sizeof( voice ));
}
/*
=========================
Voice_Idle
Run timeout for all clients
=========================
*/
void Voice_Idle( double frametime )
{
int i;
if( !voice_enable.value )
{
Voice_Shutdown();
return;
}
// update local player status first
Voice_StatusTimeout( &voice.local, VOICE_LOOPBACK_INDEX, frametime );
for( i = 0; i < MAX_CLIENTS; i++ )
Voice_StatusTimeout( &voice.players_status[i], i, frametime );
}
/*
=========================
Voice_Init
Initialize the voice subsystem
=========================
*/
qboolean Voice_Init( const char *pszCodecName, int quality )
{
if( !voice_enable.value )
return false;
Voice_Shutdown();
if( Q_strcmp( pszCodecName, "opus" ))
{
Con_Printf( S_ERROR "Server requested unsupported codec: %s", pszCodecName );
return false;
}
voice.initialized = false;
voice.channels = 1;
voice.width = 2;
voice.samplerate = SOUND_48k;
voice.frame_size = Voice_GetFrameSize( 40.0f );
voice.autogain.block_size = 128;
if( !Voice_InitOpusDecoder( ))
{
// no reason to init encoder and open audio device
// if we can't hear other players
Con_Printf( S_ERROR "Voice chat disabled.\n" );
Voice_Shutdown();
return false;
}
// we can hear others players, so it's fine to fail now
voice.initialized = true;
if( !Voice_InitOpusEncoder( quality ))
{
Con_Printf( S_WARN "Other players will not be able to hear you.\n" );
return false;
}
if( !VoiceCapture_Init( ))
Con_Printf( S_WARN "No microphone is available.\n" );
return true;
}