1 files changed, 452 insertions, 0 deletions
diff --git a/src/client/snd_codec_opus.cpp b/src/client/snd_codec_opus.cpp
new file mode 100644
index 0000000..a8ffba5
--- /dev/null
+++ b/src/client/snd_codec_opus.cpp
@@ -0,0 +1,452 @@
+/*
+===========================================================================
+Copyright (C) 1999-2005 Id Software, Inc.
+Copyright (C) 2005 Stuart Dalton (badcdev@gmail.com)
+Copyright (C) 2005-2006 Joerg Dietrich <dietrich_joerg@gmx.de>
+Copyright (C) 2015-2019 GrangerHub
+
+This file is part of Tremulous.
+
+Tremulous 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.
+
+Tremulous 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.
+
+You should have received a copy of the GNU General Public License
+along with Tremulous; if not, see <https://www.gnu.org/licenses/>
+
+===========================================================================
+*/
+
+// Ogg Opus support is enabled by this define
+#ifdef USE_CODEC_OPUS
+
+// includes for the Q3 sound system
+#include "client.h"
+
+// includes for the Ogg Opus codec
+#include <opusfile.h>
+
+#include <cerrno>
+
+#include "snd_codec.h"
+
+// samples are 16 bit
+#define OPUS_SAMPLEWIDTH 2
+
+// Q3 Ogg Opus codec
+snd_codec_t opus_codec =
+{
+	"opus",
+	S_OggOpus_CodecLoad,
+	S_OggOpus_CodecOpenStream,
+	S_OggOpus_CodecReadStream,
+	S_OggOpus_CodecCloseStream,
+	NULL
+};
+
+// callbacks for opusfile
+
+// fread() replacement
+int S_OggOpus_Callback_read(void *datasource, unsigned char *ptr, int size )
+{
+	snd_stream_t *stream;
+	int bytesRead = 0;
+
+	// check if input is valid
+	if(!ptr)
+	{
+		errno = EFAULT;
+		return -1;
+	}
+	
+	if(!size)
+	{
+		// It's not an error, caller just wants zero bytes!
+		errno = 0;
+		return 0;
+	}
+ 
+	if (size < 0)
+	{
+		errno = EINVAL;
+		return -1;
+	}
+
+	if(!datasource)
+	{
+		errno = EBADF;
+		return -1;
+	}
+	
+	// we use a snd_stream_t in the generic pointer to pass around
+	stream = (snd_stream_t *) datasource;
+
+	// read it with the Q3 function FS_Read()
+	bytesRead = FS_Read(ptr, size, stream->file);
+
+	// update the file position
+	stream->pos += bytesRead;
+
+	return bytesRead;
+}
+
+// fseek() replacement
+int S_OggOpus_Callback_seek(void *datasource, opus_int64 offset, int whence)
+{
+	snd_stream_t *stream;
+	int retVal = 0;
+
+	// check if input is valid
+	if(!datasource)
+	{
+		errno = EBADF; 
+		return -1;
+	}
+
+	// snd_stream_t in the generic pointer
+	stream = (snd_stream_t *) datasource;
+
+	// we must map the whence to its Q3 counterpart
+	switch(whence)
+	{
+		case SEEK_SET :
+		{
+			// set the file position in the actual file with the Q3 function
+			retVal = FS_Seek(stream->file, (long) offset, FS_SEEK_SET);
+
+			// something has gone wrong, so we return here
+			if(retVal < 0)
+			{
+			 return retVal;
+			}
+
+			// keep track of file position
+			stream->pos = (int) offset;
+			break;
+		}
+  
+		case SEEK_CUR :
+		{
+			// set the file position in the actual file with the Q3 function
+			retVal = FS_Seek(stream->file, (long) offset, FS_SEEK_CUR);
+
+			// something has gone wrong, so we return here
+			if(retVal < 0)
+			{
+			 return retVal;
+			}
+
+			// keep track of file position
+			stream->pos += (int) offset;
+			break;
+		}
+ 
+		case SEEK_END :
+		{
+			// set the file position in the actual file with the Q3 function
+			retVal = FS_Seek(stream->file, (long) offset, FS_SEEK_END);
+
+			// something has gone wrong, so we return here
+			if(retVal < 0)
+			{
+			 return retVal;
+			}
+
+			// keep track of file position
+			stream->pos = stream->length + (int) offset;
+			break;
+		}
+  
+		default :
+		{
+			// unknown whence, so we return an error
+			errno = EINVAL;
+			return -1;
+		}
+	}
+
+	// stream->pos shouldn't be smaller than zero or bigger than the filesize
+	stream->pos = (stream->pos < 0) ? 0 : stream->pos;
+	stream->pos = (stream->pos > stream->length) ? stream->length : stream->pos;
+
+	return 0;
+}
+
+// fclose() replacement
+int S_OggOpus_Callback_close(void *datasource)
+{
+	// we do nothing here and close all things manually in S_OggOpus_CodecCloseStream()
+	return 0;
+}
+
+// ftell() replacement
+opus_int64 S_OggOpus_Callback_tell(void *datasource)
+{
+	snd_stream_t   *stream;
+
+	// check if input is valid
+	if(!datasource)
+	{
+		errno = EBADF;
+		return -1;
+	}
+
+	// snd_stream_t in the generic pointer
+	stream = (snd_stream_t *) datasource;
+
+	return (opus_int64) FS_FTell(stream->file);
+}
+
+// the callback structure
+const OpusFileCallbacks S_OggOpus_Callbacks =
+{
+ &S_OggOpus_Callback_read,
+ &S_OggOpus_Callback_seek,
+ &S_OggOpus_Callback_tell,
+ &S_OggOpus_Callback_close
+};
+
+/*
+=================
+S_OggOpus_CodecOpenStream
+=================
+*/
+snd_stream_t *S_OggOpus_CodecOpenStream(const char *filename)
+{
+	snd_stream_t *stream;
+
+	// Opus codec control structure
+	OggOpusFile *of;
+
+	// some variables used to get informations about the file
+	const OpusHead *opusInfo;
+	ogg_int64_t numSamples;
+
+	// check if input is valid
+	if(!filename)
+	{
+		return NULL;
+	}
+
+	// Open the stream
+	stream = S_CodecUtilOpen(filename, &opus_codec);
+	if(!stream)
+	{
+		return NULL;
+	}
+
+	// open the codec with our callbacks and stream as the generic pointer
+	of = op_open_callbacks(stream, &S_OggOpus_Callbacks, NULL, 0, NULL );
+	if (!of)
+	{
+		S_CodecUtilClose(&stream);
+
+		return NULL;
+	}
+
+	// the stream must be seekable
+	if(!op_seekable(of))
+	{
+		op_free(of);
+
+		S_CodecUtilClose(&stream);
+
+		return NULL;
+	}
+
+	// get the info about channels and rate
+	opusInfo = op_head(of, -1);
+	if(!opusInfo)
+	{
+		op_free(of);
+
+		S_CodecUtilClose(&stream);
+
+		return NULL;
+	}
+
+	if(opusInfo->stream_count != 1)
+	{
+		op_free(of);
+
+		S_CodecUtilClose(&stream);
+
+		Com_Printf("Only Ogg Opus files with one stream are support\n");
+		return NULL;
+	}
+
+	if(opusInfo->channel_count != 1 && opusInfo->channel_count != 2)
+	{
+		op_free(of);
+
+		S_CodecUtilClose(&stream);
+
+		Com_Printf("Only mono and stereo Ogg Opus files are supported\n");
+		return NULL;
+	}
+
+	// get the number of sample-frames in the file
+	numSamples = op_pcm_total(of, -1);
+
+	// fill in the info-structure in the stream
+	stream->info.rate = 48000;
+	stream->info.width = OPUS_SAMPLEWIDTH;
+	stream->info.channels = opusInfo->channel_count;
+	stream->info.samples = numSamples;
+	stream->info.size = stream->info.samples * stream->info.channels * stream->info.width;
+	stream->info.dataofs = 0;
+
+	// We use stream->pos for the file pointer in the compressed ogg file
+	stream->pos = 0;
+	
+	// We use the generic pointer in stream for the opus codec control structure
+	stream->ptr = of;
+
+	return stream;
+}
+
+/*
+=================
+S_OggOpus_CodecCloseStream
+=================
+*/
+void S_OggOpus_CodecCloseStream(snd_stream_t *stream)
+{
+	// check if input is valid
+	if(!stream)
+	{
+		return;
+	}
+	
+	// let the opus codec cleanup its stuff
+	op_free((OggOpusFile *) stream->ptr);
+
+	// close the stream
+	S_CodecUtilClose(&stream);
+}
+
+/*
+=================
+S_OggOpus_CodecReadStream
+=================
+*/
+int S_OggOpus_CodecReadStream(snd_stream_t *stream, int bytes, void *buffer)
+{
+	// buffer handling
+	int samplesRead, samplesLeft, c;
+	opus_int16 *bufPtr;
+
+	// check if input is valid
+	if(!(stream && buffer))
+	{
+		return 0;
+	}
+
+	if(bytes <= 0)
+	{
+		return 0;
+	}
+
+	samplesRead = 0;
+	samplesLeft = bytes / stream->info.channels / stream->info.width;
+	bufPtr = (opus_int16*)buffer;
+
+	if(samplesLeft <= 0)
+	{
+		return 0;
+	}
+
+	// cycle until we have the requested or all available bytes read
+	while(-1)
+	{
+		// read some samples from the opus codec
+		c = op_read((OggOpusFile *) stream->ptr, bufPtr + samplesRead * stream->info.channels, samplesLeft * stream->info.channels, NULL);
+		
+		// no more samples are left
+		if(c <= 0)
+		{
+			break;
+		}
+
+		samplesRead += c;
+		samplesLeft -= c;
+  
+		// we have enough samples
+		if(samplesLeft <= 0)
+		{
+			break;
+		}
+	}
+
+	return samplesRead * stream->info.channels * stream->info.width;
+}
+
+/*
+=====================================================================
+S_OggOpus_CodecLoad
+
+We handle S_OggOpus_CodecLoad as a special case of the streaming functions 
+where we read the whole stream at once.
+======================================================================
+*/
+void *S_OggOpus_CodecLoad(const char *filename, snd_info_t *info)
+{
+	snd_stream_t *stream;
+	byte *buffer;
+	int bytesRead;
+	
+	// check if input is valid
+	if(!(filename && info))
+	{
+		return NULL;
+	}
+	
+	// open the file as a stream
+	stream = S_OggOpus_CodecOpenStream(filename);
+	if(!stream)
+	{
+		return NULL;
+	}
+	
+	// copy over the info
+	info->rate = stream->info.rate;
+	info->width = stream->info.width;
+	info->channels = stream->info.channels;
+	info->samples = stream->info.samples;
+	info->size = stream->info.size;
+	info->dataofs = stream->info.dataofs;
+
+	// allocate a buffer
+	// this buffer must be free-ed by the caller of this function
+    	buffer = (byte*)Hunk_AllocateTempMemory(info->size);
+	if(!buffer)
+	{
+		S_OggOpus_CodecCloseStream(stream);
+	
+		return NULL;	
+	}
+
+	// fill the buffer
+	bytesRead = S_OggOpus_CodecReadStream(stream, info->size, buffer);
+	
+	// we don't even have read a single byte
+	if(bytesRead <= 0)
+	{
+		Hunk_FreeTempMemory(buffer);
+		S_OggOpus_CodecCloseStream(stream);
+
+		return NULL;	
+	}
+
+	S_OggOpus_CodecCloseStream(stream);
+	
+	return buffer;
+}
+
+#endif // USE_CODEC_OPUS