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|
/*****************************************************************************
* audio.c: transcoding stream output module (audio)
*****************************************************************************
* Copyright (C) 2003-2009 VLC authors and VideoLAN
* $Id: 60124202114cffcafc6cf60f0a6f025a3a6cce4a $
*
* Authors: Laurent Aimar <fenrir@via.ecp.fr>
* Gildas Bazin <gbazin@videolan.org>
* Jean-Paul Saman <jpsaman #_at_# m2x dot nl>
* Antoine Cellerier <dionoea at videolan dot org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#include "transcode.h"
#include <vlc_aout.h>
#include <vlc_input.h>
#include <vlc_meta.h>
#include <vlc_modules.h>
static const int pi_channels_maps[9] =
{
0,
AOUT_CHAN_CENTER,
AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
AOUT_CHAN_LFE | AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
| AOUT_CHAN_REARRIGHT,
AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
| AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT,
AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
| AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE,
AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
| AOUT_CHAN_REARCENTER | AOUT_CHAN_MIDDLELEFT
| AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_LFE,
AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT
| AOUT_CHAN_REARRIGHT | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT
| AOUT_CHAN_LFE,
};
static int audio_update_format( decoder_t *p_dec )
{
aout_FormatPrepare( &p_dec->fmt_out.audio );
return 0;
}
static int transcode_audio_initialize_filters( sout_stream_t *p_stream, sout_stream_id_sys_t *id,
sout_stream_sys_t *p_sys, audio_sample_format_t *fmt_last )
{
/* Load user specified audio filters */
/* XXX: These variable names come kinda out of nowhere... */
var_Create( p_stream, "audio-time-stretch", VLC_VAR_BOOL );
var_Create( p_stream, "audio-filter", VLC_VAR_STRING );
if( p_sys->psz_af )
var_SetString( p_stream, "audio-filter", p_sys->psz_af );
id->p_af_chain = aout_FiltersNew( p_stream, fmt_last,
&id->p_encoder->fmt_in.audio, NULL );
var_Destroy( p_stream, "audio-filter" );
var_Destroy( p_stream, "audio-time-stretch" );
if( id->p_af_chain == NULL )
{
msg_Err( p_stream, "Unable to initialize audio filters" );
module_unneed( id->p_encoder, id->p_encoder->p_module );
id->p_encoder->p_module = NULL;
module_unneed( id->p_decoder, id->p_decoder->p_module );
id->p_decoder->p_module = NULL;
return VLC_EGENERIC;
}
id->fmt_audio.i_rate = fmt_last->i_rate;
id->fmt_audio.i_physical_channels = fmt_last->i_physical_channels;
return VLC_SUCCESS;
}
static int transcode_audio_initialize_encoder( sout_stream_id_sys_t *id, sout_stream_t *p_stream )
{
sout_stream_sys_t *p_sys = p_stream->p_sys;
/* Initialization of encoder format structures */
es_format_Init( &id->p_encoder->fmt_in, id->p_decoder->fmt_in.i_cat,
id->p_decoder->fmt_out.i_codec );
id->p_encoder->fmt_in.audio.i_format = id->p_decoder->fmt_out.i_codec;
id->p_encoder->fmt_in.audio.i_rate = id->p_encoder->fmt_out.audio.i_rate;
id->p_encoder->fmt_in.audio.i_physical_channels =
id->p_encoder->fmt_out.audio.i_physical_channels;
aout_FormatPrepare( &id->p_encoder->fmt_in.audio );
id->p_encoder->p_cfg = p_stream->p_sys->p_audio_cfg;
id->p_encoder->p_module =
module_need( id->p_encoder, "encoder", p_sys->psz_aenc, true );
/* p_sys->i_acodec = 0 if there isn't acodec defined */
if( !id->p_encoder->p_module && p_sys->i_acodec )
{
msg_Err( p_stream, "cannot find audio encoder (module:%s fourcc:%4.4s). "
"Take a look few lines earlier to see possible reason.",
p_sys->psz_aenc ? p_sys->psz_aenc : "any",
(char *)&p_sys->i_acodec );
module_unneed( id->p_decoder, id->p_decoder->p_module );
id->p_decoder->p_module = NULL;
return VLC_EGENERIC;
}
id->p_encoder->fmt_out.i_codec =
vlc_fourcc_GetCodec( AUDIO_ES, id->p_encoder->fmt_out.i_codec );
/* Fix input format */
id->p_encoder->fmt_in.audio.i_format = id->p_encoder->fmt_in.i_codec;
if( !id->p_encoder->fmt_in.audio.i_physical_channels
|| !id->p_encoder->fmt_in.audio.i_original_channels )
{
if( id->p_encoder->fmt_in.audio.i_channels < (sizeof(pi_channels_maps) / sizeof(*pi_channels_maps)) )
id->p_encoder->fmt_in.audio.i_physical_channels =
id->p_encoder->fmt_in.audio.i_original_channels =
pi_channels_maps[id->p_encoder->fmt_in.audio.i_channels];
}
aout_FormatPrepare( &id->p_encoder->fmt_in.audio );
return VLC_SUCCESS;
}
int transcode_audio_new( sout_stream_t *p_stream,
sout_stream_id_sys_t *id )
{
sout_stream_sys_t *p_sys = p_stream->p_sys;
audio_sample_format_t fmt_last;
/*
* Open decoder
*/
/* Initialization of decoder structures */
id->p_decoder->fmt_out = id->p_decoder->fmt_in;
id->p_decoder->fmt_out.i_extra = 0;
id->p_decoder->fmt_out.p_extra = 0;
id->p_decoder->pf_decode_audio = NULL;
id->p_decoder->pf_aout_format_update = audio_update_format;
/* id->p_decoder->p_cfg = p_sys->p_audio_cfg; */
id->p_decoder->p_module =
module_need( id->p_decoder, "decoder", "$codec", false );
if( !id->p_decoder->p_module )
{
msg_Err( p_stream, "cannot find audio decoder" );
return VLC_EGENERIC;
}
/* decoders don't set audio.i_format, but audio filters use it */
id->p_decoder->fmt_out.audio.i_format = id->p_decoder->fmt_out.i_codec;
aout_FormatPrepare( &id->p_decoder->fmt_out.audio );
fmt_last = id->p_decoder->fmt_out.audio;
/* Fix AAC SBR changing number of channels and sampling rate */
if( !(id->p_decoder->fmt_in.i_codec == VLC_CODEC_MP4A &&
fmt_last.i_rate != id->p_encoder->fmt_in.audio.i_rate &&
fmt_last.i_channels != id->p_encoder->fmt_in.audio.i_channels) )
fmt_last.i_rate = id->p_decoder->fmt_in.audio.i_rate;
/*
* Open encoder
*/
if( transcode_audio_initialize_encoder( id, p_stream ) == VLC_EGENERIC )
return VLC_EGENERIC;
if( unlikely( transcode_audio_initialize_filters( p_stream, id, p_sys,
&fmt_last ) != VLC_SUCCESS ) )
return VLC_EGENERIC;
return VLC_SUCCESS;
}
void transcode_audio_close( sout_stream_id_sys_t *id )
{
/* Close decoder */
if( id->p_decoder->p_module )
module_unneed( id->p_decoder, id->p_decoder->p_module );
id->p_decoder->p_module = NULL;
if( id->p_decoder->p_description )
vlc_meta_Delete( id->p_decoder->p_description );
id->p_decoder->p_description = NULL;
/* Close encoder */
if( id->p_encoder->p_module )
module_unneed( id->p_encoder, id->p_encoder->p_module );
id->p_encoder->p_module = NULL;
/* Close filters */
if( id->p_af_chain != NULL )
aout_FiltersDelete( (vlc_object_t *)NULL, id->p_af_chain );
}
int transcode_audio_process( sout_stream_t *p_stream,
sout_stream_id_sys_t *id,
block_t *in, block_t **out )
{
sout_stream_sys_t *p_sys = p_stream->p_sys;
block_t *p_block, *p_audio_buf;
*out = NULL;
if( unlikely( in == NULL ) )
{
block_t *p_block;
do {
p_block = id->p_encoder->pf_encode_audio(id->p_encoder, NULL );
block_ChainAppend( out, p_block );
} while( p_block );
return VLC_SUCCESS;
}
while( (p_audio_buf = id->p_decoder->pf_decode_audio( id->p_decoder,
&in )) )
{
if( unlikely( !id->p_encoder->p_module ) )
{
/* Complete destination format */
id->p_encoder->fmt_out.i_codec = p_sys->i_acodec;
id->p_encoder->fmt_out.audio.i_rate = p_sys->i_sample_rate > 0 ?
p_sys->i_sample_rate : id->p_decoder->fmt_out.audio.i_rate;
id->p_encoder->fmt_out.i_bitrate = p_sys->i_abitrate;
id->p_encoder->fmt_out.audio.i_bitspersample =
id->p_decoder->fmt_out.audio.i_bitspersample;
id->p_encoder->fmt_out.audio.i_channels = p_sys->i_channels > 0 ?
p_sys->i_channels : id->p_decoder->fmt_out.audio.i_channels;
id->p_encoder->fmt_in.audio.i_original_channels =
id->p_encoder->fmt_out.audio.i_original_channels =
id->p_decoder->fmt_out.audio.i_physical_channels;
id->p_encoder->fmt_in.audio.i_physical_channels =
id->p_encoder->fmt_out.audio.i_physical_channels =
pi_channels_maps[id->p_encoder->fmt_out.audio.i_channels];
if( transcode_audio_initialize_encoder( id, p_stream ) )
{
msg_Err( p_stream, "cannot create audio chain" );
return VLC_EGENERIC;
}
if( unlikely( transcode_audio_initialize_filters( p_stream, id, p_sys,
&id->p_decoder->fmt_out.audio ) != VLC_SUCCESS ) )
return VLC_EGENERIC;
date_Init( &id->next_input_pts, id->p_decoder->fmt_out.audio.i_rate, 1 );
date_Set( &id->next_input_pts, p_audio_buf->i_pts );
}
/* Check if audio format has changed, and filters need reinit */
if( unlikely( ( id->p_decoder->fmt_out.audio.i_rate != id->fmt_audio.i_rate ) ||
( id->p_decoder->fmt_out.audio.i_physical_channels != id->fmt_audio.i_physical_channels ) ) )
{
msg_Info( p_stream, "Audio changed, trying to reinitialize filters" );
if( id->p_af_chain != NULL )
aout_FiltersDelete( (vlc_object_t *)NULL, id->p_af_chain );
/* decoders don't set audio.i_format, but audio filters use it */
id->p_decoder->fmt_out.audio.i_format = id->p_decoder->fmt_out.i_codec;
aout_FormatPrepare( &id->p_decoder->fmt_out.audio );
if( transcode_audio_initialize_filters( p_stream, id, p_sys,
&id->p_decoder->fmt_out.audio ) != VLC_SUCCESS )
return VLC_EGENERIC;
/* Set next_input_pts to run with new samplerate */
date_Init( &id->next_input_pts, id->fmt_audio.i_rate, 1 );
date_Set( &id->next_input_pts, p_audio_buf->i_pts );
}
if( p_sys->b_master_sync )
{
mtime_t i_pts = date_Get( &id->next_input_pts );
mtime_t i_drift = 0;
if( likely( p_audio_buf->i_pts != VLC_TS_INVALID ) )
i_drift = p_audio_buf->i_pts - i_pts;
if ( unlikely(i_drift > MASTER_SYNC_MAX_DRIFT
|| i_drift < -MASTER_SYNC_MAX_DRIFT) )
{
msg_Dbg( p_stream,
"audio drift is too high (%"PRId64"), resetting master sync",
i_drift );
date_Set( &id->next_input_pts, p_audio_buf->i_pts );
i_pts = date_Get( &id->next_input_pts );
if( likely(p_audio_buf->i_pts != VLC_TS_INVALID ) )
i_drift = p_audio_buf->i_pts - i_pts;
}
p_sys->i_master_drift = i_drift;
date_Increment( &id->next_input_pts, p_audio_buf->i_nb_samples );
}
p_audio_buf->i_dts = p_audio_buf->i_pts;
/* Run filter chain */
p_audio_buf = aout_FiltersPlay( id->p_af_chain, p_audio_buf,
INPUT_RATE_DEFAULT );
if( !p_audio_buf )
abort();
p_audio_buf->i_dts = p_audio_buf->i_pts;
p_block = id->p_encoder->pf_encode_audio( id->p_encoder, p_audio_buf );
block_ChainAppend( out, p_block );
block_Release( p_audio_buf );
}
return VLC_SUCCESS;
}
bool transcode_audio_add( sout_stream_t *p_stream, es_format_t *p_fmt,
sout_stream_id_sys_t *id )
{
sout_stream_sys_t *p_sys = p_stream->p_sys;
msg_Dbg( p_stream,
"creating audio transcoding from fcc=`%4.4s' to fcc=`%4.4s'",
(char*)&p_fmt->i_codec, (char*)&p_sys->i_acodec );
/* Complete destination format */
id->p_encoder->fmt_out.i_codec = p_sys->i_acodec;
id->p_encoder->fmt_out.audio.i_rate = p_sys->i_sample_rate > 0 ?
p_sys->i_sample_rate : p_fmt->audio.i_rate;
id->p_encoder->fmt_out.i_bitrate = p_sys->i_abitrate;
id->p_encoder->fmt_out.audio.i_bitspersample =
p_fmt->audio.i_bitspersample;
id->p_encoder->fmt_out.audio.i_channels = p_sys->i_channels > 0 ?
p_sys->i_channels : p_fmt->audio.i_channels;
id->p_encoder->fmt_in.audio.i_original_channels =
id->p_encoder->fmt_out.audio.i_original_channels =
id->p_decoder->fmt_out.audio.i_physical_channels;
id->p_encoder->fmt_in.audio.i_physical_channels =
id->p_encoder->fmt_out.audio.i_physical_channels =
pi_channels_maps[id->p_encoder->fmt_out.audio.i_channels];
/* Build decoder -> filter -> encoder chain */
if( transcode_audio_new( p_stream, id ) == VLC_EGENERIC )
{
msg_Err( p_stream, "cannot create audio chain" );
return false;
}
/* Open output stream */
id->id = sout_StreamIdAdd( p_stream->p_next, &id->p_encoder->fmt_out );
id->b_transcode = true;
if( !id->id )
{
transcode_audio_close( id );
return false;
}
/* Reinit encoder again later on, when all information from decoders
* is available. */
if( id->p_encoder->p_module )
{
module_unneed( id->p_encoder, id->p_encoder->p_module );
id->p_encoder->p_module = NULL;
if( id->p_encoder->fmt_out.p_extra )
{
free( id->p_encoder->fmt_out.p_extra );
id->p_encoder->fmt_out.p_extra = NULL;
id->p_encoder->fmt_out.i_extra = 0;
}
if( id->p_af_chain != NULL )
aout_FiltersDelete( (vlc_object_t *)NULL, id->p_af_chain );
id->p_af_chain = NULL;
}
return true;
}
|
