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885 lines
28 KiB
885 lines
28 KiB
/*****************************************************************************
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* opus.c: opus decoder/encoder module making use of libopus.
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*****************************************************************************
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* Copyright (C) 2003-2009, 2012 VLC authors and VideoLAN
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*
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* Authors: Gregory Maxwell <greg@xiph.org>
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* Based on speex.c by: Gildas Bazin <gbazin@videolan.org>
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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 Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <vlc_common.h>
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#include <vlc_plugin.h>
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#include <vlc_codec.h>
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#include <vlc_aout.h>
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#include "../demux/xiph.h"
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#include <ogg/ogg.h>
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#include <opus.h>
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#include <opus_multistream.h>
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#ifdef OPUS_HAVE_OPUS_PROJECTION_H
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# include <opus_projection.h> /* from 1.3.0 */
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#endif
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#include "opus_header.h"
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#ifndef OPUS_SET_GAIN
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#include <math.h>
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#endif
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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static int OpenDecoder ( vlc_object_t * );
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static void CloseDecoder ( vlc_object_t * );
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#ifdef ENABLE_SOUT
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static int OpenEncoder ( vlc_object_t * );
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static void CloseEncoder ( encoder_t * );
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#endif
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vlc_module_begin ()
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set_subcategory( SUBCAT_INPUT_ACODEC )
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set_description( N_("Opus audio decoder") )
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set_capability( "audio decoder", 100 )
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set_shortname( N_("Opus") )
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set_callbacks( OpenDecoder, CloseDecoder )
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#ifdef ENABLE_SOUT
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add_submodule ()
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set_description( N_("Opus audio encoder") )
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set_capability( "audio encoder", 150 )
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set_shortname( N_("Opus") )
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set_callback( OpenEncoder )
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#endif
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vlc_module_end ()
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/*****************************************************************************
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* decoder_sys_t : opus decoder descriptor
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*****************************************************************************/
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typedef struct
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{
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/*
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* Input properties
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*/
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bool b_has_headers;
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/*
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* Opus properties
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*/
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OpusHeader header;
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OpusMSDecoder *p_st;
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#ifdef OPUS_HAVE_OPUS_PROJECTION_H
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OpusProjectionDecoder *p_pr;
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#endif
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/*
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* Common properties
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*/
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date_t end_date;
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} decoder_sys_t;
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static const int pi_channels_maps[9] =
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{
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0,
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AOUT_CHAN_CENTER,
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AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
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AOUT_CHAN_CENTER | AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
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AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
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| AOUT_CHAN_REARRIGHT,
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AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
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| AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT,
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AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
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| AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE,
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AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
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| AOUT_CHAN_REARCENTER | AOUT_CHAN_MIDDLELEFT
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| AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_LFE,
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AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT
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| AOUT_CHAN_REARRIGHT | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT
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| AOUT_CHAN_LFE,
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};
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/*
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** channel order as defined in http://www.xiph.org/vorbis/doc/Vorbis_I_spec.html#x1-800004.3.9
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*/
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/* recommended vorbis channel order for 8 channels */
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static const uint32_t pi_8channels_in[] =
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{ AOUT_CHAN_LEFT, AOUT_CHAN_CENTER, AOUT_CHAN_RIGHT,
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AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
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AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,AOUT_CHAN_LFE, 0 };
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/* recommended vorbis channel order for 7 channels */
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static const uint32_t pi_7channels_in[] =
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{ AOUT_CHAN_LEFT, AOUT_CHAN_CENTER, AOUT_CHAN_RIGHT,
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AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
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AOUT_CHAN_REARCENTER, AOUT_CHAN_LFE, 0 };
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/* recommended vorbis channel order for 6 channels */
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static const uint32_t pi_6channels_in[] =
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{ AOUT_CHAN_LEFT, AOUT_CHAN_CENTER, AOUT_CHAN_RIGHT,
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AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, AOUT_CHAN_LFE, 0 };
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/* recommended vorbis channel order for 5 channels */
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static const uint32_t pi_5channels_in[] =
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{ AOUT_CHAN_LEFT, AOUT_CHAN_CENTER, AOUT_CHAN_RIGHT,
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AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 };
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/* recommended vorbis channel order for 4 channels */
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static const uint32_t pi_4channels_in[] =
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{ AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 };
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/* recommended vorbis channel order for 3 channels */
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static const uint32_t pi_3channels_in[] =
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{ AOUT_CHAN_LEFT, AOUT_CHAN_CENTER, AOUT_CHAN_RIGHT, 0 };
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/****************************************************************************
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* Local prototypes
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****************************************************************************/
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static int DecodeAudio ( decoder_t *, block_t * );
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static void Flush( decoder_t * );
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static int ProcessHeaders( decoder_t * );
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static int ProcessInitialHeader ( decoder_t *, ogg_packet * );
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static block_t *ProcessPacket( decoder_t *, ogg_packet *, block_t * );
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static block_t *DecodePacket( decoder_t *, ogg_packet *, int, vlc_tick_t );
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/*****************************************************************************
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* Implementation Wrappers
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*****************************************************************************/
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static void DecoderDestroy( decoder_sys_t *p_sys )
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{
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#ifdef OPUS_HAVE_OPUS_PROJECTION_H
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if( p_sys->p_pr )
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{
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opus_projection_decoder_destroy( p_sys->p_pr );
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p_sys->p_pr = NULL;
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}
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else
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#endif
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if( p_sys->p_st )
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{
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opus_multistream_decoder_destroy( p_sys->p_st );
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p_sys->p_st = NULL;
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}
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}
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#ifdef OPUS_SET_GAIN
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static int SetDecoderGain( decoder_sys_t *p_sys, int gain )
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{
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# ifdef OPUS_HAVE_OPUS_PROJECTION_H
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if( p_sys->p_pr )
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{
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if( opus_projection_decoder_ctl(
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p_sys->p_pr, OPUS_SET_GAIN(gain) ) != OPUS_OK )
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return VLC_EGENERIC;
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}
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else
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# endif
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{
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if( opus_multistream_decoder_ctl(
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p_sys->p_st, OPUS_SET_GAIN(gain) ) != OPUS_OK )
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return VLC_EGENERIC;
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}
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return VLC_SUCCESS;
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}
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#endif
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static int DecoderDecodeFloat( decoder_sys_t *p_sys, const ogg_packet *p_oggpacket,
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int spp, block_t *out )
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{
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#ifdef OPUS_HAVE_OPUS_PROJECTION_H
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if( p_sys->p_pr )
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return opus_projection_decode_float(p_sys->p_pr, p_oggpacket->packet,
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p_oggpacket->bytes,
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(float *)out->p_buffer, spp, 0);
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else
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#endif
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return opus_multistream_decode_float(p_sys->p_st, p_oggpacket->packet,
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p_oggpacket->bytes,
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(float *)out->p_buffer, spp, 0);
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}
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static int DecoderCreate( decoder_sys_t *p_sys )
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{
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int err;
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const OpusHeader *p_header = &p_sys->header;
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#ifdef OPUS_HAVE_OPUS_PROJECTION_H
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if( p_header->channel_mapping == 3 )
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{
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p_sys->p_pr = opus_projection_decoder_create( 48000, p_header->channels,
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p_header->nb_streams, p_header->nb_coupled,
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p_header->dmatrix, p_header->dmatrix_size, &err );
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}
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else
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#endif
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{
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const unsigned char* p_stream_map = p_header->stream_map;
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unsigned char new_stream_map[8];
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if ( p_header->channel_mapping <= 1 )
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{
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if( p_header->channels > 2 )
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{
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static const uint32_t *pi_ch[6] = { pi_3channels_in, pi_4channels_in,
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pi_5channels_in, pi_6channels_in,
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pi_7channels_in, pi_8channels_in };
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uint8_t pi_chan_table[AOUT_CHAN_MAX];
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aout_CheckChannelReorder( pi_ch[p_header->channels-3], NULL,
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pi_channels_maps[p_header->channels],
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pi_chan_table );
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for( int i=0;i<p_header->channels;i++ )
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new_stream_map[pi_chan_table[i]] = p_header->stream_map[i];
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p_stream_map = new_stream_map;
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}
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}
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p_sys->p_st = opus_multistream_decoder_create( 48000, p_header->channels,
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p_header->nb_streams, p_header->nb_coupled,
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p_stream_map, &err );
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}
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return err == OPUS_OK ? VLC_SUCCESS : VLC_EGENERIC;
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}
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/*****************************************************************************
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* OpenDecoder: probe the decoder and return score
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*****************************************************************************/
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static int OpenDecoder( vlc_object_t *p_this )
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{
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decoder_t *p_dec = (decoder_t*)p_this;
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decoder_sys_t *p_sys;
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if( p_dec->fmt_in->i_codec != VLC_CODEC_OPUS )
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return VLC_EGENERIC;
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/* Allocate the memory needed to store the decoder's structure */
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if( ( p_dec->p_sys = p_sys = malloc(sizeof(decoder_sys_t)) ) == NULL )
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return VLC_ENOMEM;
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p_sys->b_has_headers = false;
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opus_header_init(&p_sys->header);
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date_Set( &p_sys->end_date, VLC_TICK_INVALID );
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/* Set output properties */
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p_dec->fmt_out.i_codec = VLC_CODEC_FL32;
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p_dec->pf_decode = DecodeAudio;
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p_dec->pf_flush = Flush;
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p_sys->p_st = NULL;
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#ifdef OPUS_HAVE_OPUS_PROJECTION_H
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p_sys->p_pr = NULL;
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#endif
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return VLC_SUCCESS;
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}
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/****************************************************************************
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* DecodeBlock: the whole thing
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****************************************************************************
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* This function must be fed with ogg packets.
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****************************************************************************/
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static block_t *DecodeBlock( decoder_t *p_dec, block_t *p_block )
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{
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decoder_sys_t *p_sys = p_dec->p_sys;
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ogg_packet oggpacket;
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/* Block to Ogg packet */
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oggpacket.packet = p_block->p_buffer;
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oggpacket.bytes = p_block->i_buffer;
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oggpacket.granulepos = -1;
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oggpacket.b_o_s = 0;
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oggpacket.e_o_s = 0;
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oggpacket.packetno = 0;
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/* Check for headers */
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if( !p_sys->b_has_headers )
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{
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if( ProcessHeaders( p_dec ) )
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{
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block_Release( p_block );
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return NULL;
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}
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p_sys->b_has_headers = true;
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}
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return ProcessPacket( p_dec, &oggpacket, p_block );
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}
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static int DecodeAudio( decoder_t *p_dec, block_t *p_block )
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{
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if( p_block == NULL ) /* No Drain */
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return VLCDEC_SUCCESS;
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p_block = DecodeBlock( p_dec, p_block );
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if( p_block != NULL )
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decoder_QueueAudio( p_dec, p_block );
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return VLCDEC_SUCCESS;
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}
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/*****************************************************************************
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* ProcessHeaders: process Opus headers.
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*****************************************************************************/
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static int ProcessHeaders( decoder_t *p_dec )
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{
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decoder_sys_t *p_sys = p_dec->p_sys;
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ogg_packet oggpacket;
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unsigned pi_size[XIPH_MAX_HEADER_COUNT];
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const void *pp_data[XIPH_MAX_HEADER_COUNT];
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unsigned i_count;
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size_t i_extra = p_dec->fmt_in->i_extra;
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const uint8_t *p_extra = p_dec->fmt_in->p_extra;
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uint8_t *p_alloc = NULL;
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/* Xiph headers as extradata */
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if( i_extra > 21 && !memcmp( &p_extra[2], "OpusHead", 8 ) )
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{
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if( xiph_SplitHeaders( pi_size, pp_data, &i_count,
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i_extra, p_extra ) || i_count < 2 )
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{
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/* Borked Xiph headers */
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free( p_alloc );
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return VLC_EGENERIC;
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}
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oggpacket.bytes = pi_size[0];
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oggpacket.packet = (unsigned char *) pp_data[0];
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}
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/* If we have no header (e.g. from RTP), make one. */
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else if( i_extra < 19 || memcmp( p_extra, "OpusHead", 8 ) )
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{
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OpusHeader header;
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opus_header_init(&header);
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opus_prepare_header( p_dec->fmt_in->audio.i_channels ? p_dec->fmt_in->audio.i_channels : 2,
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p_dec->fmt_in->audio.i_rate ? p_dec->fmt_in->audio.i_rate : 48000,
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&header );
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int ret = opus_write_header( &p_alloc, &i_extra, &header,
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opus_get_version_string() );
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opus_header_clean(&header);
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if(ret != 0 || i_extra < 21)
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{
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free( p_alloc );
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return VLC_ENOMEM;
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}
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oggpacket.bytes = p_alloc[1]; /* Xiph header is type8/size8 */
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oggpacket.packet = (unsigned char *) p_alloc + 2; /* Point directly to opus header start */
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}
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else /* raw header in extradata */
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{
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oggpacket.bytes = i_extra;
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oggpacket.packet = (unsigned char *) p_extra;
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}
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/* Take care of the initial Opus header */
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oggpacket.granulepos = -1;
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oggpacket.e_o_s = 0;
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oggpacket.packetno = 0;
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oggpacket.b_o_s = 1; /* yes this actually is a b_o_s packet :) */
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int ret = ProcessInitialHeader( p_dec, &oggpacket );
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if (ret != VLC_SUCCESS)
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{
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msg_Err( p_dec, "initial Opus header is corrupted" );
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opus_header_clean( &p_sys->header );
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opus_header_init( &p_sys->header );
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}
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free( p_alloc );
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return ret;
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}
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/*****************************************************************************
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* ProcessInitialHeader: processes the initial Opus header packet.
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*****************************************************************************/
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static int ProcessInitialHeader( decoder_t *p_dec, ogg_packet *p_oggpacket )
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{
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decoder_sys_t *p_sys = p_dec->p_sys;
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OpusHeader *p_header = &p_sys->header;
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if( !opus_header_parse((unsigned char *)p_oggpacket->packet,p_oggpacket->bytes,p_header) )
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{
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msg_Err( p_dec, "cannot read Opus header" );
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return VLC_EGENERIC;
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}
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msg_Dbg( p_dec, "Opus audio with %d channels, %d samples preskip, %d samplerate",
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p_header->channels, p_header->preskip, p_header->input_sample_rate );
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if((p_header->channels>2 && p_header->channel_mapping==0) ||
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(p_header->channels>8 && p_header->channel_mapping==1) ||
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(p_header->channels>18 && p_header->channel_mapping==2) ||
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(p_header->channels>18 && p_header->channel_mapping==3))
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{
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msg_Err( p_dec, "Unsupported channel mapping" );
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return VLC_EGENERIC;
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}
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if (p_header->channel_mapping >= 2)
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{
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int i_order = floor(sqrt(p_header->channels));
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int i_nondiegetic = p_header->channels - i_order * i_order;
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msg_Dbg( p_dec, "Opus Ambisonic audio order=%d channels=%d+%d",
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i_order, p_header->channels - i_nondiegetic, i_nondiegetic);
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if (i_nondiegetic != 0 && i_nondiegetic != 2)
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{
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msg_Err( p_dec, "Unsupported ambisonic channel mapping" );
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return VLC_EGENERIC;
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}
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}
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/* Setup the format */
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p_dec->fmt_out.audio.i_channels = p_header->channels;
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p_dec->fmt_out.audio.i_rate = 48000;
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if (p_header->channel_mapping <= 1)
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{
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p_dec->fmt_out.audio.i_physical_channels =
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pi_channels_maps[p_header->channels];
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}
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else //p_header->channel_mapping >= 2
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{
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p_dec->fmt_out.audio.channel_type = AUDIO_CHANNEL_TYPE_AMBISONICS;
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}
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/* Opus decoder init */
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if( DecoderCreate( p_sys ) != VLC_SUCCESS )
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{
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msg_Err( p_dec, "decoder initialization failed" );
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return VLC_EGENERIC;
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}
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#ifdef OPUS_SET_GAIN
|
|
if( SetDecoderGain( p_sys, p_header->gain ) != VLC_SUCCESS )
|
|
{
|
|
msg_Err( p_dec, "OPUS_SET_GAIN failed" );
|
|
DecoderDestroy( p_sys );
|
|
return VLC_EGENERIC;
|
|
}
|
|
#endif
|
|
|
|
date_Init( &p_sys->end_date, 48000, 1 );
|
|
|
|
return VLC_SUCCESS;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* Flush:
|
|
*****************************************************************************/
|
|
static void Flush( decoder_t *p_dec )
|
|
{
|
|
decoder_sys_t *p_sys = p_dec->p_sys;
|
|
|
|
date_Set( &p_sys->end_date, VLC_TICK_INVALID );
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* ProcessPacket: processes a Opus packet.
|
|
*****************************************************************************/
|
|
static block_t *ProcessPacket( decoder_t *p_dec, ogg_packet *p_oggpacket,
|
|
block_t *p_block )
|
|
{
|
|
decoder_sys_t *p_sys = p_dec->p_sys;
|
|
|
|
if( p_block->i_flags & (BLOCK_FLAG_CORRUPTED|BLOCK_FLAG_DISCONTINUITY) )
|
|
{
|
|
Flush( p_dec );
|
|
if( p_block->i_flags & BLOCK_FLAG_CORRUPTED )
|
|
{
|
|
block_Release( p_block );
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/* Date management */
|
|
if( p_block->i_pts != VLC_TICK_INVALID &&
|
|
p_block->i_pts != date_Get( &p_sys->end_date ) )
|
|
{
|
|
date_Set( &p_sys->end_date, p_block->i_pts );
|
|
}
|
|
|
|
if( date_Get( &p_sys->end_date ) == VLC_TICK_INVALID )
|
|
{
|
|
/* We've just started the stream, wait for the first PTS. */
|
|
block_Release( p_block );
|
|
return NULL;
|
|
}
|
|
|
|
/* trimming info */
|
|
vlc_tick_t i_max_duration = (p_block->i_flags & BLOCK_FLAG_END_OF_SEQUENCE) ?
|
|
p_block->i_length : 0;
|
|
|
|
block_t *p_aout_buffer = DecodePacket( p_dec, p_oggpacket,
|
|
p_block->i_nb_samples,
|
|
i_max_duration );
|
|
|
|
block_Release( p_block );
|
|
return p_aout_buffer;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* DecodePacket: decodes a Opus packet.
|
|
*****************************************************************************/
|
|
static block_t *DecodePacket( decoder_t *p_dec, ogg_packet *p_oggpacket,
|
|
int i_nb_samples, vlc_tick_t i_duration )
|
|
{
|
|
decoder_sys_t *p_sys = p_dec->p_sys;
|
|
|
|
if( !p_oggpacket->bytes )
|
|
return NULL;
|
|
|
|
int spp;
|
|
spp=opus_packet_get_nb_frames(p_oggpacket->packet,p_oggpacket->bytes);
|
|
if(spp>0)spp*=opus_packet_get_samples_per_frame(p_oggpacket->packet,48000);
|
|
if(spp<120||spp>120*48)return NULL;
|
|
|
|
/* Since the information isn't always available at the demux level
|
|
* use the packet's sample number */
|
|
if(!i_nb_samples)
|
|
i_nb_samples = spp;
|
|
|
|
if( decoder_UpdateAudioFormat( p_dec ) )
|
|
return NULL;
|
|
block_t *p_aout_buffer=decoder_NewAudioBuffer( p_dec, spp );
|
|
if ( !p_aout_buffer )
|
|
{
|
|
msg_Err(p_dec, "Oops: No new buffer was returned!");
|
|
return NULL;
|
|
}
|
|
|
|
spp = DecoderDecodeFloat( p_sys, p_oggpacket, spp, p_aout_buffer );
|
|
|
|
int i_end_trim = 0;
|
|
if( i_duration > 0 && spp > 0 &&
|
|
i_duration < vlc_tick_from_samples(i_nb_samples, 48000) )
|
|
{
|
|
i_end_trim = spp - VLC_CLIP(samples_from_vlc_tick(i_duration, 48000), 0, spp);
|
|
}
|
|
|
|
if( spp < 0 || i_nb_samples <= 0 || i_end_trim >= i_nb_samples)
|
|
{
|
|
block_Release(p_aout_buffer);
|
|
if( spp < 0 )
|
|
msg_Err( p_dec, "Error: corrupted stream?" );
|
|
return NULL;
|
|
}
|
|
|
|
p_aout_buffer->i_buffer = (i_nb_samples - i_end_trim) *
|
|
p_sys->header.channels * sizeof(float);
|
|
|
|
if( spp > i_nb_samples )
|
|
{
|
|
memmove(p_aout_buffer->p_buffer,
|
|
p_aout_buffer->p_buffer
|
|
+ (spp - i_nb_samples)*p_sys->header.channels*sizeof(float),
|
|
p_aout_buffer->i_buffer);
|
|
}
|
|
i_nb_samples -= i_end_trim;
|
|
|
|
#ifndef OPUS_SET_GAIN
|
|
if(p_sys->header.gain!=0)
|
|
{
|
|
float gain = pow(10., p_sys->header.gain/5120.);
|
|
float *buf =(float *)p_aout_buffer->p_buffer;
|
|
for( int i = 0; i < i_nb_samples*p_sys->header.channels; i++)
|
|
buf[i] *= gain;
|
|
}
|
|
#endif
|
|
p_aout_buffer->i_nb_samples = i_nb_samples;
|
|
p_aout_buffer->i_pts = date_Get( &p_sys->end_date );
|
|
p_aout_buffer->i_length = date_Increment( &p_sys->end_date, i_nb_samples )
|
|
- p_aout_buffer->i_pts;
|
|
return p_aout_buffer;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* CloseDecoder: Opus decoder destruction
|
|
*****************************************************************************/
|
|
static void CloseDecoder( vlc_object_t *p_this )
|
|
{
|
|
decoder_t * p_dec = (decoder_t *)p_this;
|
|
decoder_sys_t *p_sys = p_dec->p_sys;
|
|
|
|
DecoderDestroy( p_sys );
|
|
|
|
opus_header_clean( &p_sys->header );
|
|
free( p_sys );
|
|
}
|
|
|
|
#ifdef ENABLE_SOUT
|
|
|
|
/* only ever encode 20 ms at a time, going longer doesn't yield much compression
|
|
gain, shorter does have a compression loss, and doesn't matter so much in
|
|
Ogg, unless you really need low latency, which would also require muxing one
|
|
packet per page. */
|
|
static const unsigned OPUS_FRAME_SIZE = 960; /* 48000 * 20 / 1000 */
|
|
|
|
typedef struct
|
|
{
|
|
OpusMSEncoder *enc;
|
|
float *buffer;
|
|
unsigned i_nb_samples;
|
|
int i_samples_delay;
|
|
block_t *padding;
|
|
int nb_streams;
|
|
} encoder_sys_t;
|
|
|
|
static unsigned fill_buffer(encoder_t *enc, unsigned src_start, block_t *src,
|
|
unsigned samples)
|
|
{
|
|
encoder_sys_t *p_sys = enc->p_sys;
|
|
const unsigned channels = enc->fmt_out.audio.i_channels;
|
|
const float *src_buf = ((const float *) src->p_buffer) + src_start;
|
|
float *dest_buf = p_sys->buffer + (p_sys->i_nb_samples * channels);
|
|
const unsigned len = samples * channels;
|
|
|
|
memcpy(dest_buf, src_buf, len * sizeof(float));
|
|
|
|
p_sys->i_nb_samples += samples;
|
|
src_start += len;
|
|
|
|
src->i_nb_samples -= samples;
|
|
return src_start;
|
|
}
|
|
|
|
static block_t *Encode(encoder_t *enc, block_t *buf)
|
|
{
|
|
encoder_sys_t *sys = enc->p_sys;
|
|
|
|
if (!buf)
|
|
return NULL;
|
|
|
|
vlc_tick_t i_pts = buf->i_pts -
|
|
vlc_tick_from_samples( sys->i_samples_delay,
|
|
enc->fmt_in.audio.i_rate );
|
|
|
|
sys->i_samples_delay += buf->i_nb_samples;
|
|
|
|
block_t *result = NULL;
|
|
unsigned src_start = 0;
|
|
unsigned padding_start = 0;
|
|
/* The maximum Opus frame size is 1275 bytes + TOC sequence length. */
|
|
const unsigned OPUS_MAX_ENCODED_BYTES = ((1275 + 3) * sys->nb_streams) - 2;
|
|
|
|
while (sys->i_nb_samples + buf->i_nb_samples >= OPUS_FRAME_SIZE)
|
|
{
|
|
block_t *out_block = block_Alloc(OPUS_MAX_ENCODED_BYTES);
|
|
if (unlikely(out_block == NULL))
|
|
{
|
|
block_ChainRelease(result);
|
|
return NULL;
|
|
}
|
|
|
|
/* add padding to beginning */
|
|
if (sys->padding)
|
|
{
|
|
const size_t leftover_space = OPUS_FRAME_SIZE - sys->i_nb_samples;
|
|
padding_start = fill_buffer(enc, padding_start, sys->padding,
|
|
__MIN(sys->padding->i_nb_samples, leftover_space));
|
|
if (sys->padding->i_nb_samples <= 0)
|
|
{
|
|
block_Release(sys->padding);
|
|
sys->padding = NULL;
|
|
}
|
|
}
|
|
|
|
/* padding may have been freed either before or inside previous
|
|
* if-statement */
|
|
if (!sys->padding)
|
|
{
|
|
const size_t leftover_space = OPUS_FRAME_SIZE - sys->i_nb_samples;
|
|
src_start = fill_buffer(enc, src_start, buf,
|
|
__MIN(buf->i_nb_samples, leftover_space));
|
|
}
|
|
|
|
opus_int32 bytes_encoded = opus_multistream_encode_float(sys->enc, sys->buffer,
|
|
OPUS_FRAME_SIZE, out_block->p_buffer, out_block->i_buffer);
|
|
|
|
if (bytes_encoded < 0)
|
|
{
|
|
block_Release(out_block);
|
|
}
|
|
else
|
|
{
|
|
out_block->i_length = vlc_tick_from_samples( OPUS_FRAME_SIZE,
|
|
enc->fmt_in.audio.i_rate );
|
|
|
|
out_block->i_dts = out_block->i_pts = i_pts;
|
|
|
|
sys->i_samples_delay -= OPUS_FRAME_SIZE;
|
|
|
|
i_pts += out_block->i_length;
|
|
|
|
sys->i_nb_samples = 0;
|
|
|
|
out_block->i_buffer = bytes_encoded;
|
|
block_ChainAppend(&result, out_block);
|
|
}
|
|
}
|
|
|
|
/* put leftover samples at beginning of buffer */
|
|
if (buf->i_nb_samples > 0)
|
|
fill_buffer(enc, src_start, buf, buf->i_nb_samples);
|
|
|
|
return result;
|
|
}
|
|
|
|
static int OpenEncoder(vlc_object_t *p_this)
|
|
{
|
|
encoder_t *enc = (encoder_t *)p_this;
|
|
|
|
if (enc->fmt_out.i_codec != VLC_CODEC_OPUS)
|
|
return VLC_EGENERIC;
|
|
|
|
encoder_sys_t *sys = malloc(sizeof(*sys));
|
|
if (!sys)
|
|
return VLC_ENOMEM;
|
|
|
|
int status = VLC_SUCCESS;
|
|
sys->buffer = NULL;
|
|
sys->enc = NULL;
|
|
|
|
enc->fmt_in.i_codec = VLC_CODEC_FL32;
|
|
enc->fmt_in.audio.i_rate = /* Only 48kHz */
|
|
enc->fmt_out.audio.i_rate = 48000;
|
|
enc->fmt_out.audio.i_channels = enc->fmt_in.audio.i_channels;
|
|
|
|
OpusHeader header;
|
|
opus_header_init(&header);
|
|
|
|
opus_prepare_header(enc->fmt_out.audio.i_channels,
|
|
enc->fmt_out.audio.i_rate, &header);
|
|
|
|
/* needed for max encoded size calculation */
|
|
sys->nb_streams = header.nb_streams;
|
|
|
|
int err;
|
|
sys->enc =
|
|
opus_multistream_surround_encoder_create(enc->fmt_in.audio.i_rate,
|
|
enc->fmt_in.audio.i_channels, header.channel_mapping,
|
|
&header.nb_streams, &header.nb_coupled, header.stream_map,
|
|
OPUS_APPLICATION_AUDIO, &err);
|
|
|
|
if (err != OPUS_OK)
|
|
{
|
|
msg_Err(enc, "Could not create encoder: error %d", err);
|
|
sys->enc = NULL;
|
|
status = VLC_EGENERIC;
|
|
goto error;
|
|
}
|
|
|
|
/* TODO: vbr, fec */
|
|
|
|
if( enc->fmt_out.i_bitrate )
|
|
opus_multistream_encoder_ctl(sys->enc, OPUS_SET_BITRATE( enc->fmt_out.i_bitrate ));
|
|
|
|
/* Buffer for incoming audio, since opus only accepts frame sizes that are
|
|
multiples of 2.5ms */
|
|
sys->buffer = vlc_alloc(header.channels, sizeof(float) * OPUS_FRAME_SIZE);
|
|
if (!sys->buffer) {
|
|
status = VLC_ENOMEM;
|
|
goto error;
|
|
}
|
|
|
|
sys->i_nb_samples = 0;
|
|
|
|
sys->i_samples_delay = 0;
|
|
int ret = opus_multistream_encoder_ctl(sys->enc,
|
|
OPUS_GET_LOOKAHEAD(&sys->i_samples_delay));
|
|
if (ret != OPUS_OK)
|
|
msg_Err(enc, "Unable to get number of lookahead samples: %s\n",
|
|
opus_strerror(ret));
|
|
|
|
header.preskip = sys->i_samples_delay;
|
|
|
|
/* Now that we have preskip, we can write the header to extradata */
|
|
if (opus_write_header((uint8_t **) &enc->fmt_out.p_extra,
|
|
&enc->fmt_out.i_extra, &header, opus_get_version_string()))
|
|
{
|
|
status = VLC_ENOMEM;
|
|
goto error;
|
|
}
|
|
|
|
if (sys->i_samples_delay > 0)
|
|
{
|
|
const unsigned padding_samples = sys->i_samples_delay *
|
|
enc->fmt_out.audio.i_channels;
|
|
sys->padding = block_Alloc(padding_samples * sizeof(float));
|
|
if (!sys->padding) {
|
|
status = VLC_ENOMEM;
|
|
goto error;
|
|
}
|
|
sys->padding->i_nb_samples = sys->i_samples_delay;
|
|
float *pad_ptr = (float *) sys->padding->p_buffer;
|
|
memset(pad_ptr, 0, padding_samples * sizeof(float));
|
|
}
|
|
else
|
|
{
|
|
sys->padding = NULL;
|
|
}
|
|
|
|
opus_header_clean(&header);
|
|
|
|
if (status != VLC_SUCCESS)
|
|
{
|
|
free(sys->buffer);
|
|
opus_multistream_encoder_destroy(sys->enc);
|
|
free(sys);
|
|
return status;
|
|
}
|
|
|
|
static const struct vlc_encoder_operations ops =
|
|
{
|
|
.close = CloseEncoder,
|
|
.encode_audio = Encode,
|
|
};
|
|
enc->ops = &ops;
|
|
enc->p_sys = sys;
|
|
|
|
return VLC_SUCCESS;
|
|
|
|
error:
|
|
opus_header_clean(&header);
|
|
if (sys->enc)
|
|
opus_multistream_encoder_destroy(sys->enc);
|
|
free(sys->buffer);
|
|
free(sys);
|
|
return status;
|
|
}
|
|
|
|
static void CloseEncoder(encoder_t *enc)
|
|
{
|
|
encoder_sys_t *sys = enc->p_sys;
|
|
|
|
opus_multistream_encoder_destroy(sys->enc);
|
|
if (sys->padding)
|
|
block_Release(sys->padding);
|
|
free(sys->buffer);
|
|
free(sys);
|
|
}
|
|
#endif /* ENABLE_SOUT */
|
|
|