100 lines
2.9 KiB
C
100 lines
2.9 KiB
C
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/*
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snd_ogg_opus.c - loading and streaming of Ogg audio format with Opus codec
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Copyright (C) 2024 SNMetamorph
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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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*/
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#include "soundlib.h"
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#include "crtlib.h"
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#include "ogg_filestream.h"
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#include <opusfile.h>
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#include <string.h>
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#include <stdint.h>
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static int OpusCallback_Read( void *datasource, byte *ptr, int nbytes )
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{
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return OggFilestream_Read( ptr, 1, nbytes, datasource );
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}
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static opus_int64 OpusCallback_Tell( void *datasource )
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{
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return OggFilestream_Tell( datasource );
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}
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static const OpusFileCallbacks op_callbacks_membuf = {
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OpusCallback_Read,
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OggFilestream_Seek,
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OpusCallback_Tell,
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NULL
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};
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/*
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=================================================================
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Ogg Opus decompression
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=================================================================
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*/
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qboolean Sound_LoadOggOpus( const char *name, const byte *buffer, fs_offset_t filesize )
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{
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long ret;
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ogg_filestream_t file;
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OggOpusFile *of;
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const OpusHead *opusHead;
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size_t written = 0;
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if( !buffer )
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return false;
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OggFilestream_Init( &file, name, buffer, filesize );
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of = op_open_callbacks( &file, &op_callbacks_membuf, NULL, 0, NULL );
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if( !of ) {
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Con_DPrintf( S_ERROR "%s: failed to load (%s): file reading error\n", __func__, file.name );
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return false;
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}
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opusHead = op_head( of, -1 );
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if( opusHead->channel_count < 1 || opusHead->channel_count > 2 ) {
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Con_DPrintf( S_ERROR "%s: failed to load (%s): unsuppored channels count\n", __func__, file.name );
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return false;
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}
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// according to OggOpus specification, sound always encoded at 48kHz sample rate
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// but this isn't a problem, engine can do resampling
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sound.channels = opusHead->channel_count;
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sound.rate = 48000;
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sound.width = 2; // always 16-bit PCM
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sound.type = WF_PCMDATA;
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sound.flags = SOUND_RESAMPLE;
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sound.samples = op_pcm_total( of, -1 );
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sound.size = sound.samples * sound.width * sound.channels;
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sound.wav = (byte *)Mem_Calloc( host.soundpool, sound.size );
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// skip undesired samples before playing sound
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if( op_pcm_seek( of, opusHead->pre_skip ) < 0 ) {
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Con_DPrintf( S_ERROR "%s: failed to load (%s): pre-skip error\n", __func__, file.name );
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return false;
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}
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while(( ret = op_read( of, (opus_int16*)(sound.wav + written), (sound.size - written) / sound.width, NULL )) != 0 )
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{
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if( ret < 0 ) {
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Con_DPrintf( S_ERROR "%s: failed to load (%s): compressed data decoding error\n", __func__, file.name );
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return false;
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}
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written += ret * sound.width * sound.channels;
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}
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op_free( of );
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return true;
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}
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