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.
*/
#define CUSTOM_MODES 1 // required to correctly link with Opus Custom
#include <opus_custom.h>
#include "common.h"
#include "client.h"
#include "voice.h"
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" );
static void Voice_ApplyGainAdjust( int16_t *samples, int count );
/*
===============================================================================
OPUS INTEGRATION
===============================================================================
*/
/*
=========================
Voice_InitOpusDecoder
=========================
*/
static qboolean Voice_InitOpusDecoder( void )
{
int err;
voice.width = sizeof( opus_int16 );
voice.samplerate = VOICE_OPUS_CUSTOM_SAMPLERATE;
voice.frame_size = VOICE_OPUS_CUSTOM_FRAME_SIZE;
voice.custom_mode = opus_custom_mode_create( SOUND_44k, voice.frame_size, &err );
if( !voice.custom_mode )
{
Con_Printf( S_ERROR "Can't create Opus Custom mode: %s\n", opus_strerror( err ));
return false;
}
voice.decoder = opus_custom_decoder_create( voice.custom_mode, VOICE_PCM_CHANNELS, &err );
if( !voice.decoder )
{
Con_Printf( S_ERROR "Can't create Opus encoder: %s\n", opus_strerror( err ));
return false;
}
return true;
}
/*
=========================
Voice_InitOpusEncoder
=========================
*/
static qboolean Voice_InitOpusEncoder( int quality )
{
int err;
voice.encoder = opus_custom_encoder_create( voice.custom_mode, VOICE_PCM_CHANNELS, &err );
if( !voice.encoder )
{
Con_Printf( S_ERROR "Can't create Opus encoder: %s\n", opus_strerror( err ));
return false;
}
switch( quality )
{
case 1: // 6 kbps
opus_custom_encoder_ctl( voice.encoder, OPUS_SET_BITRATE( 6000 ));
break;
case 2: // 12 kbps
opus_custom_encoder_ctl( voice.encoder, OPUS_SET_BITRATE( 12000 ));
break;
case 4: // 64 kbps
opus_custom_encoder_ctl( voice.encoder, OPUS_SET_BITRATE( 64000 ));
break;
case 5: // 96 kbps
opus_custom_encoder_ctl( voice.encoder, OPUS_SET_BITRATE( 96000 ));
break;
default: // 36 kbps
opus_custom_encoder_ctl( voice.encoder, OPUS_SET_BITRATE( 36000 ));
break;
}
return true;
}
/*
=========================
Voice_ShutdownOpusDecoder
=========================
*/
static void Voice_ShutdownOpusDecoder( void )
{
if( voice.decoder )
{
opus_custom_decoder_destroy( voice.decoder );
voice.decoder = NULL;
}
}
/*
=========================
Voice_ShutdownOpusEncoder
=========================
*/
static void Voice_ShutdownOpusEncoder( void )
{
if( voice.encoder )
{
opus_custom_encoder_destroy( voice.encoder );
voice.encoder = NULL;
}
if( voice.custom_mode )
{
opus_custom_mode_destroy( voice.custom_mode );
voice.custom_mode = NULL;
}
}
/*
=========================
Voice_GetOpusCompressedData
=========================
*/
static uint Voice_GetOpusCompressedData( byte *out, uint maxsize, uint *frames )
{
uint ofs = 0, size = 0;
uint frame_size_bytes = voice.frame_size * voice.width;
if( voice.input_file )
{
uint numbytes;
double updateInterval, curtime = Sys_DoubleTime();
updateInterval = curtime - voice.start_time;
voice.start_time = curtime;
numbytes = updateInterval * voice.samplerate * voice.width * VOICE_PCM_CHANNELS;
numbytes = Q_min( numbytes, voice.input_file->size - voice.input_file_pos );
numbytes = Q_min( numbytes, sizeof( voice.input_buffer ) - voice.input_buffer_pos );
memcpy( voice.input_buffer + voice.input_buffer_pos, voice.input_file->buffer + voice.input_file_pos, numbytes );
voice.input_buffer_pos += numbytes;
voice.input_file_pos += numbytes;
}
if( !voice.input_file )
VoiceCapture_Lock( true );
for( ofs = 0; voice.input_buffer_pos - ofs >= frame_size_bytes && ofs <= voice.input_buffer_pos; ofs += frame_size_bytes )
{
int bytes;
#if 1
if( !voice.input_file )
{
// adjust gain before encoding, but only for input from voice
Voice_ApplyGainAdjust((opus_int16*)(voice.input_buffer + ofs), voice.frame_size);
}
#endif
bytes = opus_custom_encode( voice.encoder, (const opus_int16 *)( voice.input_buffer + ofs ),
voice.frame_size, out + size + sizeof( uint16_t ), maxsize );
if( bytes > 0 )
{
// write compressed frame size
*((uint16_t *)&out[size]) = bytes;
size += bytes + sizeof( uint16_t );
maxsize -= bytes + sizeof( uint16_t );
(*frames)++;
}
else
{
Con_Printf( S_ERROR "%s: failed to encode frame: %s\n", __func__, opus_strerror( bytes ));
}
}
// did we compress anything? update counters
if( ofs )
{
fs_offset_t remaining = voice.input_buffer_pos - ofs;
// move remaining samples to the beginning of buffer
memmove( voice.input_buffer, voice.input_buffer + ofs, remaining );
voice.input_buffer_pos = remaining;
}
if( !voice.input_file )
VoiceCapture_Lock( false );
return size;
}
/*
===============================================================================
VOICE CHAT INTEGRATION
===============================================================================
*/
/*
=========================
Voice_ApplyGainAdjust
=========================
*/
static void Voice_ApplyGainAdjust( int16_t *samples, int count )
{
float gain, modifiedMax;
int average, adjustedSample, blockOffset = 0;
for( ;; )
{
int i, localMax = 0, 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];
int absSample = abs( sample );
if( absSample > localMax )
localMax = absSample;
localSum += absSample;
gain = voice.autogain.current_gain + i * voice.autogain.gain_multiplier;
adjustedSample = Q_min( SHRT_MAX, Q_max(( int )( sample * gain ), SHRT_MIN ));
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( (float)SHRT_MAX / 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_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( voice.input_file )
{
FS_FreeSound( voice.input_file );
voice.input_file = NULL;
}
VoiceCapture_Activate( false );
voice.is_recording = false;
Voice_Status( VOICE_LOCALCLIENT_INDEX, false );
voice.input_buffer_pos = 0;
memset( voice.input_buffer, 0, sizeof( voice.input_buffer ));
}
/*
=========================
Voice_RecordStart
=========================
*/
void Voice_RecordStart( void )
{
Voice_RecordStop();
if( voice_inputfromfile.value )
{
voice.input_file = FS_LoadSound( "voice_input.wav", NULL, 0 );
if( voice.input_file )
{
Sound_Process( &voice.input_file, voice.samplerate, voice.width, SOUND_RESAMPLE );
voice.input_file_pos = 0;
voice.start_time = Sys_DoubleTime();
voice.is_recording = true;
}
else
{
FS_FreeSound( voice.input_file );
voice.input_file = NULL;
}
}
if( !Voice_IsRecording() )
voice.is_recording = VoiceCapture_Activate( true );
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_PCM_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 = 0;
int ofs = 0;
if( !voice.decoder )
return;
// decode frame by frame
for( ;; )
{
int frame_samples;
uint16_t compressed_size;
// no compressed size mark
if( ofs + sizeof( uint16_t ) > size )
break;
compressed_size = *(const uint16_t *)(data + ofs);
ofs += sizeof( uint16_t );
// no frame data
if( ofs + compressed_size > size )
break;
frame_samples = opus_custom_decode( voice.decoder, data + ofs, compressed_size,
(opus_int16*)voice.decompress_buffer + samples, voice.frame_size );
ofs += compressed_size;
samples += frame_samples;
}
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 );
}
/*
=========================
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( FBitSet( voice_enable.flags, FCVAR_CHANGED ) && !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;
if( Q_strcmp( pszCodecName, VOICE_OPUS_CUSTOM_CODEC ))
{
Con_Printf( S_ERROR "Server requested unsupported codec: %s\n", pszCodecName );
return false;
}
// reinitialize only if codec parameters are different
if( !Q_strcmp( voice.codec, pszCodecName ) && voice.quality == quality )
return true;
Voice_Shutdown();
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;
Q_strncpy( voice.codec, pszCodecName, sizeof( voice.codec ));
if( !Voice_InitOpusEncoder( quality ))
{
Con_Printf( S_WARN "Other players will not be able to hear you.\n" );
return false;
}
voice.quality = quality;
if( !VoiceCapture_Init( ))
Con_Printf( S_WARN "No microphone is available.\n" );
return true;
}