You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
316 lines
11 KiB
316 lines
11 KiB
/*****************************************************************************
|
|
* mad.c: MPEG-1 & 2 audio layer I, II, III + MPEG 2.5 decoder,
|
|
* using MAD (MPEG Audio Decoder)
|
|
*****************************************************************************
|
|
* Copyright (C) 2001-2016 VLC authors and VideoLAN
|
|
*
|
|
* Authors: Christophe Massiot <massiot@via.ecp.fr>
|
|
* Jean-Paul Saman <jpsaman _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.
|
|
*****************************************************************************/
|
|
|
|
/*****************************************************************************
|
|
* NOTA BENE: this module requires the linking against a library which is
|
|
* known to require licensing under the GNU General Public License version 2
|
|
* (or later). Therefore, the result of compiling this module will normally
|
|
* be subject to the terms of that later license.
|
|
*****************************************************************************/
|
|
|
|
|
|
/*****************************************************************************
|
|
* Preamble
|
|
*****************************************************************************/
|
|
|
|
#include <mad.h>
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include "config.h"
|
|
#endif
|
|
#include <assert.h>
|
|
|
|
#include <vlc_common.h>
|
|
#include <vlc_plugin.h>
|
|
#include <vlc_block.h>
|
|
#include <vlc_aout.h>
|
|
#include <vlc_codec.h>
|
|
|
|
#define MAD_BUFFER_GUARD 8
|
|
|
|
/*****************************************************************************
|
|
* Local prototypes
|
|
*****************************************************************************/
|
|
static int Open ( vlc_object_t * );
|
|
static void Close( vlc_object_t * );
|
|
|
|
/*****************************************************************************
|
|
* Local structures
|
|
*****************************************************************************/
|
|
typedef struct
|
|
{
|
|
struct mad_stream mad_stream;
|
|
struct mad_frame mad_frame;
|
|
struct mad_synth mad_synth;
|
|
|
|
int i_reject_count;
|
|
block_t *p_last_buf;
|
|
} decoder_sys_t;
|
|
|
|
/*****************************************************************************
|
|
* Module descriptor
|
|
*****************************************************************************/
|
|
vlc_module_begin ()
|
|
set_subcategory( SUBCAT_INPUT_ACODEC )
|
|
set_description( N_("MPEG audio layer I/II/III decoder") )
|
|
set_capability( "audio decoder", 99 )
|
|
set_callbacks( Open, Close )
|
|
vlc_module_end ()
|
|
|
|
/*****************************************************************************
|
|
*
|
|
*****************************************************************************/
|
|
static void PrepareDecoderDiscontinuityGlitch( decoder_sys_t *p_sys )
|
|
{
|
|
mad_frame_mute( &p_sys->mad_frame );
|
|
mad_synth_mute( &p_sys->mad_synth );
|
|
p_sys->i_reject_count = 3;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* DecodeBlock: decode an MPEG audio frame.
|
|
*****************************************************************************/
|
|
static block_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
|
|
{
|
|
decoder_sys_t *p_sys = p_dec->p_sys;
|
|
block_t *p_out_buf = NULL, *p_last_buf = NULL;
|
|
|
|
if( !pp_block )
|
|
{
|
|
/* Drain */
|
|
p_last_buf = p_sys->p_last_buf;
|
|
p_sys->p_last_buf = NULL;
|
|
if( !p_last_buf )
|
|
return NULL;
|
|
}
|
|
else
|
|
{
|
|
if( !*pp_block )
|
|
return NULL;
|
|
block_t *p_in_buf = *pp_block;
|
|
*pp_block = NULL;
|
|
|
|
if( p_in_buf->i_buffer < MAD_BUFFER_GUARD )
|
|
{
|
|
block_Release( p_in_buf );
|
|
return NULL;
|
|
}
|
|
|
|
/* Buffers passed to the mad_stream_buffer() function need to ends with
|
|
* the header (MAD_BUFFER_GUARD) of the following block. Therefore,
|
|
* this DecodeBlock() function will always return the output buffer
|
|
* corresponding to the last input buffer. */
|
|
if( !p_sys->p_last_buf )
|
|
{
|
|
/* Wait for the next block */
|
|
p_sys->p_last_buf = p_in_buf;
|
|
return NULL;
|
|
}
|
|
p_last_buf = p_sys->p_last_buf;
|
|
p_sys->p_last_buf = p_in_buf;
|
|
|
|
/* Put the header of the current buffer at the end of the last one.
|
|
* Normally, this won't do a real realloc() since VLC blocks are
|
|
* allocated with pre and post padding */
|
|
p_last_buf = block_Realloc( p_last_buf, 0,
|
|
p_last_buf->i_buffer + MAD_BUFFER_GUARD );
|
|
if( !p_last_buf )
|
|
return NULL;
|
|
memcpy( &p_last_buf->p_buffer[p_last_buf->i_buffer - MAD_BUFFER_GUARD],
|
|
p_in_buf->p_buffer, MAD_BUFFER_GUARD);
|
|
}
|
|
|
|
mad_stream_buffer( &p_sys->mad_stream, p_last_buf->p_buffer,
|
|
p_last_buf->i_buffer );
|
|
|
|
/* Do the actual decoding now (ignore EOF error when draining). */
|
|
if ( mad_frame_decode( &p_sys->mad_frame, &p_sys->mad_stream ) == -1
|
|
&& p_sys->i_reject_count == 0
|
|
&& ( pp_block != NULL || p_sys->mad_stream.error != MAD_ERROR_BUFLEN ) )
|
|
{
|
|
msg_Err( p_dec, "libmad error: %s",
|
|
mad_stream_errorstr( &p_sys->mad_stream ) );
|
|
if( !MAD_RECOVERABLE( p_sys->mad_stream.error ) )
|
|
PrepareDecoderDiscontinuityGlitch( p_sys );
|
|
}
|
|
else if( p_last_buf->i_flags & BLOCK_FLAG_DISCONTINUITY )
|
|
{
|
|
PrepareDecoderDiscontinuityGlitch( p_sys );
|
|
}
|
|
|
|
if( p_sys->i_reject_count > 1 )
|
|
goto reject;
|
|
|
|
mad_synth_frame( &p_sys->mad_synth, &p_sys->mad_frame );
|
|
|
|
if( p_sys->i_reject_count > 0 )
|
|
goto reject;
|
|
|
|
struct mad_pcm * p_pcm = &p_sys->mad_synth.pcm;
|
|
unsigned int i_samples = p_pcm->length;
|
|
mad_fixed_t const * p_left = p_pcm->samples[0];
|
|
mad_fixed_t const * p_right = p_pcm->samples[1];
|
|
p_out_buf = decoder_NewAudioBuffer( p_dec, i_samples );
|
|
if( !p_out_buf )
|
|
goto end;
|
|
p_out_buf->i_dts = p_last_buf->i_dts;
|
|
p_out_buf->i_pts = p_last_buf->i_pts;
|
|
p_out_buf->i_length = p_last_buf->i_length;
|
|
float *p_samples = (float *)p_out_buf->p_buffer;
|
|
|
|
if (p_pcm->channels > p_dec->fmt_out.audio.i_channels)
|
|
{
|
|
msg_Err( p_dec, "wrong channels count (corrupt stream?): %u > %u",
|
|
p_pcm->channels, p_dec->fmt_out.audio.i_channels);
|
|
PrepareDecoderDiscontinuityGlitch( p_sys );
|
|
goto reject;
|
|
}
|
|
|
|
if( i_samples != p_out_buf->i_nb_samples )
|
|
{
|
|
msg_Err( p_dec, "unexpected samples count (corrupt stream?): "
|
|
"%u / %u", i_samples, p_out_buf->i_nb_samples );
|
|
PrepareDecoderDiscontinuityGlitch( p_sys );
|
|
goto reject;
|
|
}
|
|
|
|
/* Interleave and keep buffers in mad_fixed_t format */
|
|
if ( p_pcm->channels == 2 )
|
|
{
|
|
while ( i_samples-- )
|
|
{
|
|
//assert( *p_left < MAD_F_ONE );
|
|
//assert( *p_left >= -MAD_F_ONE );
|
|
//assert( *p_right < MAD_F_ONE );
|
|
//assert( *p_right >= -MAD_F_ONE );
|
|
*p_samples++ = (float)*p_left++ / (float)MAD_F_ONE;
|
|
*p_samples++ = (float)*p_right++ / (float)MAD_F_ONE;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
assert( p_pcm->channels == 1 );
|
|
while ( i_samples-- )
|
|
{
|
|
//assert( *p_left < MAD_F_ONE );
|
|
//assert( *p_left >= -MAD_F_ONE );
|
|
*p_samples++ = (float)*p_left++ / (float)MAD_F_ONE;
|
|
}
|
|
}
|
|
|
|
end:
|
|
block_Release( p_last_buf );
|
|
return p_out_buf;
|
|
reject:
|
|
p_sys->i_reject_count--;
|
|
if( p_out_buf )
|
|
{
|
|
block_Release( p_out_buf );
|
|
p_out_buf = NULL;
|
|
}
|
|
goto end;
|
|
}
|
|
|
|
static int DecodeAudio( decoder_t *p_dec, block_t *p_block )
|
|
{
|
|
block_t **pp_block = p_block ? &p_block : NULL, *p_out;
|
|
while( ( p_out = DecodeBlock( p_dec, pp_block ) ) != NULL )
|
|
decoder_QueueAudio( p_dec, p_out );
|
|
return VLCDEC_SUCCESS;
|
|
}
|
|
|
|
static void DecodeFlush( decoder_t *p_dec )
|
|
{
|
|
decoder_sys_t *p_sys = p_dec->p_sys;
|
|
|
|
if( p_sys->p_last_buf )
|
|
block_Release( p_sys->p_last_buf );
|
|
p_sys->p_last_buf = NULL;
|
|
|
|
PrepareDecoderDiscontinuityGlitch( p_sys );
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* Open:
|
|
*****************************************************************************/
|
|
static int Open( vlc_object_t *p_this )
|
|
{
|
|
decoder_t *p_dec = (decoder_t *)p_this;
|
|
decoder_sys_t *p_sys;
|
|
|
|
if( ( p_dec->fmt_in->i_codec != VLC_CODEC_MPGA
|
|
&& p_dec->fmt_in->i_codec != VLC_CODEC_MP3
|
|
&& p_dec->fmt_in->i_codec != VLC_FOURCC('m','p','g','3') )
|
|
|| p_dec->fmt_in->audio.i_rate == 0
|
|
|| p_dec->fmt_in->audio.i_physical_channels == 0
|
|
|| p_dec->fmt_in->audio.i_bytes_per_frame == 0
|
|
|| p_dec->fmt_in->audio.i_frame_length == 0 )
|
|
return VLC_EGENERIC;
|
|
|
|
/* Allocate the memory needed to store the module's structure */
|
|
p_sys = p_dec->p_sys = malloc( sizeof(decoder_sys_t) );
|
|
if( p_sys == NULL )
|
|
return VLC_ENOMEM;
|
|
p_sys->i_reject_count = 0;
|
|
p_sys->p_last_buf = NULL;
|
|
|
|
/* Initialize libmad */
|
|
mad_stream_init( &p_sys->mad_stream );
|
|
mad_frame_init( &p_sys->mad_frame );
|
|
mad_synth_init( &p_sys->mad_synth );
|
|
mad_stream_options( &p_sys->mad_stream, MAD_OPTION_IGNORECRC );
|
|
|
|
p_dec->fmt_out.audio = p_dec->fmt_in->audio;
|
|
p_dec->fmt_out.audio.i_format = VLC_CODEC_FL32;
|
|
p_dec->fmt_out.i_codec = p_dec->fmt_out.audio.i_format;
|
|
|
|
aout_FormatPrepare( &p_dec->fmt_out.audio );
|
|
|
|
if( decoder_UpdateAudioFormat( p_dec ) )
|
|
{
|
|
Close( p_this );
|
|
return VLC_EGENERIC;
|
|
}
|
|
|
|
p_dec->pf_decode = DecodeAudio;
|
|
p_dec->pf_flush = DecodeFlush;
|
|
|
|
return VLC_SUCCESS;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* Close : deallocate data structures
|
|
*****************************************************************************/
|
|
static void Close( vlc_object_t *p_this )
|
|
{
|
|
decoder_t *p_dec = (decoder_t *)p_this;
|
|
decoder_sys_t *p_sys = p_dec->p_sys;
|
|
|
|
mad_synth_finish( &p_sys->mad_synth );
|
|
mad_frame_finish( &p_sys->mad_frame );
|
|
mad_stream_finish( &p_sys->mad_stream );
|
|
if( p_sys->p_last_buf )
|
|
block_Release( p_sys->p_last_buf );
|
|
free( p_sys );
|
|
}
|
|
|