mirror of
https://code.videolan.org/videolan/vlc
synced 2024-10-03 01:31:53 +02:00
488 lines
16 KiB
C
488 lines
16 KiB
C
/*****************************************************************************
|
|
* decoder.c: AAC decoder using libfaad2
|
|
*****************************************************************************
|
|
* Copyright (C) 2001, 2003 the VideoLAN team
|
|
* $Id$
|
|
*
|
|
* Authors: Laurent Aimar <fenrir@via.ecp.fr>
|
|
* Gildas Bazin <gbazin@videolan.org>
|
|
*
|
|
* This program 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 2 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU 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.
|
|
*****************************************************************************/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include "config.h"
|
|
#endif
|
|
|
|
#include <vlc_common.h>
|
|
#include <vlc_plugin.h>
|
|
#include <vlc_input.h>
|
|
#include <vlc_aout.h>
|
|
#include <vlc_codec.h>
|
|
|
|
#include <faad.h>
|
|
|
|
/*****************************************************************************
|
|
* Module descriptor
|
|
*****************************************************************************/
|
|
static int Open( vlc_object_t * );
|
|
static void Close( vlc_object_t * );
|
|
|
|
vlc_module_begin ()
|
|
set_description( N_("AAC audio decoder (using libfaad2)") )
|
|
set_capability( "decoder", 100 )
|
|
set_category( CAT_INPUT )
|
|
set_subcategory( SUBCAT_INPUT_ACODEC )
|
|
set_callbacks( Open, Close )
|
|
vlc_module_end ()
|
|
|
|
/****************************************************************************
|
|
* Local prototypes
|
|
****************************************************************************/
|
|
static aout_buffer_t *DecodeBlock( decoder_t *, block_t ** );
|
|
static void DoReordering( uint32_t *, uint32_t *, int, int, uint32_t * );
|
|
|
|
#define MAX_CHANNEL_POSITIONS 9
|
|
|
|
struct decoder_sys_t
|
|
{
|
|
/* faad handler */
|
|
faacDecHandle *hfaad;
|
|
|
|
/* samples */
|
|
audio_date_t date;
|
|
|
|
/* temporary buffer */
|
|
uint8_t *p_buffer;
|
|
int i_buffer;
|
|
size_t i_buffer_size;
|
|
|
|
/* Channel positions of the current stream (for re-ordering) */
|
|
uint32_t pi_channel_positions[MAX_CHANNEL_POSITIONS];
|
|
|
|
bool b_sbr, b_ps;
|
|
};
|
|
|
|
static const uint32_t pi_channels_in[MAX_CHANNEL_POSITIONS] =
|
|
{ FRONT_CHANNEL_CENTER, FRONT_CHANNEL_LEFT, FRONT_CHANNEL_RIGHT,
|
|
SIDE_CHANNEL_LEFT, SIDE_CHANNEL_RIGHT,
|
|
BACK_CHANNEL_LEFT, BACK_CHANNEL_RIGHT,
|
|
BACK_CHANNEL_CENTER, LFE_CHANNEL };
|
|
static const uint32_t pi_channels_out[MAX_CHANNEL_POSITIONS] =
|
|
{ AOUT_CHAN_CENTER, AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
|
|
AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
|
|
AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
|
|
AOUT_CHAN_REARCENTER, AOUT_CHAN_LFE };
|
|
static const uint32_t pi_channels_ordered[MAX_CHANNEL_POSITIONS] =
|
|
{ AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
|
|
AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
|
|
AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
|
|
AOUT_CHAN_CENTER, AOUT_CHAN_REARCENTER, AOUT_CHAN_LFE
|
|
};
|
|
static const uint32_t pi_channels_guessed[MAX_CHANNEL_POSITIONS] =
|
|
{ 0, AOUT_CHAN_CENTER, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
|
|
AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_LFE,
|
|
AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
|
|
| AOUT_CHAN_REARRIGHT,
|
|
AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
|
|
| AOUT_CHAN_REARRIGHT | AOUT_CHAN_CENTER,
|
|
AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
|
|
| AOUT_CHAN_REARRIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_LFE,
|
|
AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_MIDDLELEFT
|
|
| AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
|
|
| AOUT_CHAN_CENTER,
|
|
AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_MIDDLELEFT
|
|
| AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
|
|
| AOUT_CHAN_CENTER | AOUT_CHAN_LFE
|
|
};
|
|
|
|
/*****************************************************************************
|
|
* OpenDecoder: probe the decoder and return score
|
|
*****************************************************************************/
|
|
static int Open( vlc_object_t *p_this )
|
|
{
|
|
decoder_t *p_dec = (decoder_t*)p_this;
|
|
decoder_sys_t *p_sys = p_dec->p_sys;
|
|
faacDecConfiguration *cfg;
|
|
|
|
if( p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','4','a') )
|
|
{
|
|
return VLC_EGENERIC;
|
|
}
|
|
|
|
/* Allocate the memory needed to store the decoder's structure */
|
|
if( ( p_dec->p_sys = p_sys =
|
|
(decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
|
|
return VLC_ENOMEM;
|
|
|
|
/* Open a faad context */
|
|
if( ( p_sys->hfaad = faacDecOpen() ) == NULL )
|
|
{
|
|
msg_Err( p_dec, "cannot initialize faad" );
|
|
return VLC_EGENERIC;
|
|
}
|
|
|
|
/* Misc init */
|
|
aout_DateSet( &p_sys->date, 0 );
|
|
p_dec->fmt_out.i_cat = AUDIO_ES;
|
|
|
|
if (vlc_CPU() & CPU_CAPABILITY_FPU)
|
|
p_dec->fmt_out.i_codec = VLC_FOURCC('f','l','3','2');
|
|
else
|
|
p_dec->fmt_out.i_codec = AOUT_FMT_S16_NE;
|
|
p_dec->pf_decode_audio = DecodeBlock;
|
|
|
|
p_dec->fmt_out.audio.i_physical_channels =
|
|
p_dec->fmt_out.audio.i_original_channels = 0;
|
|
|
|
if( p_dec->fmt_in.i_extra > 0 )
|
|
{
|
|
/* We have a decoder config so init the handle */
|
|
unsigned long i_rate;
|
|
unsigned char i_channels;
|
|
|
|
if( faacDecInit2( p_sys->hfaad, p_dec->fmt_in.p_extra,
|
|
p_dec->fmt_in.i_extra,
|
|
&i_rate, &i_channels ) < 0 )
|
|
{
|
|
return VLC_EGENERIC;
|
|
}
|
|
|
|
p_dec->fmt_out.audio.i_rate = i_rate;
|
|
p_dec->fmt_out.audio.i_channels = i_channels;
|
|
p_dec->fmt_out.audio.i_physical_channels
|
|
= p_dec->fmt_out.audio.i_original_channels
|
|
= pi_channels_guessed[i_channels];
|
|
aout_DateInit( &p_sys->date, i_rate );
|
|
}
|
|
else
|
|
{
|
|
/* Will be initalised from first frame */
|
|
p_dec->fmt_out.audio.i_rate = 0;
|
|
p_dec->fmt_out.audio.i_channels = 0;
|
|
}
|
|
|
|
/* Set the faad config */
|
|
cfg = faacDecGetCurrentConfiguration( p_sys->hfaad );
|
|
if (vlc_CPU() & CPU_CAPABILITY_FPU)
|
|
cfg->outputFormat = FAAD_FMT_FLOAT;
|
|
else
|
|
cfg->outputFormat = FAAD_FMT_16BIT;
|
|
faacDecSetConfiguration( p_sys->hfaad, cfg );
|
|
|
|
/* buffer */
|
|
p_sys->i_buffer = p_sys->i_buffer_size = 0;
|
|
p_sys->p_buffer = NULL;
|
|
|
|
/* Faad2 can't deal with truncated data (eg. from MPEG TS) */
|
|
p_dec->b_need_packetized = true;
|
|
|
|
p_sys->b_sbr = p_sys->b_ps = false;
|
|
return VLC_SUCCESS;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* DecodeBlock:
|
|
*****************************************************************************/
|
|
static aout_buffer_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
|
|
{
|
|
decoder_sys_t *p_sys = p_dec->p_sys;
|
|
block_t *p_block;
|
|
|
|
if( !pp_block || !*pp_block ) return NULL;
|
|
|
|
p_block = *pp_block;
|
|
|
|
if( p_block->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
|
|
{
|
|
block_Release( p_block );
|
|
return NULL;
|
|
}
|
|
|
|
/* Remove ADTS header if we have decoder specific config */
|
|
if( p_dec->fmt_in.i_extra && p_block->i_buffer > 7 )
|
|
{
|
|
if( p_block->p_buffer[0] == 0xff &&
|
|
( p_block->p_buffer[1] & 0xf0 ) == 0xf0 ) /* syncword */
|
|
{ /* ADTS header present */
|
|
size_t i_header_size; /* 7 bytes (+ 2 bytes for crc) */
|
|
i_header_size = 7 + ( ( p_block->p_buffer[1] & 0x01 ) ? 0 : 2 );
|
|
/* FIXME: multiple blocks per frame */
|
|
if( p_block->i_buffer > i_header_size )
|
|
{
|
|
vlc_memcpy( p_block->p_buffer,
|
|
p_block->p_buffer + i_header_size,
|
|
p_block->i_buffer - i_header_size );
|
|
p_block->i_buffer -= i_header_size;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Append the block to the temporary buffer */
|
|
if( p_sys->i_buffer_size < p_sys->i_buffer + p_block->i_buffer )
|
|
{
|
|
p_sys->i_buffer_size = p_sys->i_buffer + p_block->i_buffer;
|
|
p_sys->p_buffer = realloc( p_sys->p_buffer, p_sys->i_buffer_size );
|
|
}
|
|
|
|
if( p_block->i_buffer > 0 )
|
|
{
|
|
vlc_memcpy( &p_sys->p_buffer[p_sys->i_buffer],
|
|
p_block->p_buffer, p_block->i_buffer );
|
|
p_sys->i_buffer += p_block->i_buffer;
|
|
p_block->i_buffer = 0;
|
|
}
|
|
|
|
if( p_dec->fmt_out.audio.i_rate == 0 && p_dec->fmt_in.i_extra > 0 )
|
|
{
|
|
/* We have a decoder config so init the handle */
|
|
unsigned long i_rate;
|
|
unsigned char i_channels;
|
|
|
|
if( faacDecInit2( p_sys->hfaad, p_dec->fmt_in.p_extra,
|
|
p_dec->fmt_in.i_extra,
|
|
&i_rate, &i_channels ) >= 0 )
|
|
{
|
|
p_dec->fmt_out.audio.i_rate = i_rate;
|
|
p_dec->fmt_out.audio.i_channels = i_channels;
|
|
p_dec->fmt_out.audio.i_physical_channels
|
|
= p_dec->fmt_out.audio.i_original_channels
|
|
= pi_channels_guessed[i_channels];
|
|
|
|
aout_DateInit( &p_sys->date, i_rate );
|
|
}
|
|
}
|
|
|
|
if( p_dec->fmt_out.audio.i_rate == 0 && p_sys->i_buffer )
|
|
{
|
|
unsigned long i_rate;
|
|
unsigned char i_channels;
|
|
|
|
/* Init faad with the first frame */
|
|
if( faacDecInit( p_sys->hfaad,
|
|
p_sys->p_buffer, p_sys->i_buffer,
|
|
&i_rate, &i_channels ) < 0 )
|
|
{
|
|
block_Release( p_block );
|
|
return NULL;
|
|
}
|
|
|
|
p_dec->fmt_out.audio.i_rate = i_rate;
|
|
p_dec->fmt_out.audio.i_channels = i_channels;
|
|
p_dec->fmt_out.audio.i_physical_channels
|
|
= p_dec->fmt_out.audio.i_original_channels
|
|
= pi_channels_guessed[i_channels];
|
|
aout_DateInit( &p_sys->date, i_rate );
|
|
}
|
|
|
|
if( p_block->i_pts != 0 && p_block->i_pts != aout_DateGet( &p_sys->date ) )
|
|
{
|
|
aout_DateSet( &p_sys->date, p_block->i_pts );
|
|
}
|
|
else if( !aout_DateGet( &p_sys->date ) )
|
|
{
|
|
/* We've just started the stream, wait for the first PTS. */
|
|
block_Release( p_block );
|
|
p_sys->i_buffer = 0;
|
|
return NULL;
|
|
}
|
|
|
|
/* Decode all data */
|
|
if( p_sys->i_buffer )
|
|
{
|
|
void *samples;
|
|
faacDecFrameInfo frame;
|
|
aout_buffer_t *p_out;
|
|
int i, j;
|
|
|
|
samples = faacDecDecode( p_sys->hfaad, &frame,
|
|
p_sys->p_buffer, p_sys->i_buffer );
|
|
|
|
if( frame.error > 0 )
|
|
{
|
|
msg_Warn( p_dec, "%s", faacDecGetErrorMessage( frame.error ) );
|
|
|
|
/* Flush the buffer */
|
|
p_sys->i_buffer = 0;
|
|
block_Release( p_block );
|
|
return NULL;
|
|
}
|
|
|
|
if( frame.channels <= 0 || frame.channels > 8 || frame.channels == 7 )
|
|
{
|
|
msg_Warn( p_dec, "invalid channels count: %i", frame.channels );
|
|
|
|
/* Flush the buffer */
|
|
p_sys->i_buffer -= frame.bytesconsumed;
|
|
if( p_sys->i_buffer > 0 )
|
|
{
|
|
memmove( p_sys->p_buffer,&p_sys->p_buffer[frame.bytesconsumed],
|
|
p_sys->i_buffer );
|
|
}
|
|
block_Release( p_block );
|
|
return NULL;
|
|
}
|
|
|
|
if( frame.samples <= 0 )
|
|
{
|
|
msg_Warn( p_dec, "decoded zero sample" );
|
|
|
|
/* Flush the buffer */
|
|
p_sys->i_buffer -= frame.bytesconsumed;
|
|
if( p_sys->i_buffer > 0 )
|
|
{
|
|
memmove( p_sys->p_buffer,&p_sys->p_buffer[frame.bytesconsumed],
|
|
p_sys->i_buffer );
|
|
}
|
|
block_Release( p_block );
|
|
return NULL;
|
|
}
|
|
|
|
/* We decoded a valid frame */
|
|
if( p_dec->fmt_out.audio.i_rate != frame.samplerate )
|
|
{
|
|
aout_DateInit( &p_sys->date, frame.samplerate );
|
|
aout_DateSet( &p_sys->date, p_block->i_pts );
|
|
}
|
|
p_block->i_pts = 0; /* PTS is valid only once */
|
|
|
|
p_dec->fmt_out.audio.i_rate = frame.samplerate;
|
|
p_dec->fmt_out.audio.i_channels = frame.channels;
|
|
p_dec->fmt_out.audio.i_physical_channels
|
|
= p_dec->fmt_out.audio.i_original_channels
|
|
= pi_channels_guessed[frame.channels];
|
|
|
|
/* Adjust stream info when dealing with SBR/PS */
|
|
if( p_sys->b_sbr != frame.sbr || p_sys->b_ps != frame.ps )
|
|
{
|
|
const char *psz_ext = (frame.sbr && frame.ps) ? "SBR+PS" :
|
|
frame.sbr ? "SBR" : "PS";
|
|
|
|
msg_Dbg( p_dec, "AAC %s (channels: %u, samplerate: %lu)",
|
|
psz_ext, frame.channels, frame.samplerate );
|
|
|
|
if( !p_dec->p_description )
|
|
p_dec->p_description = vlc_meta_New();
|
|
if( p_dec->p_description )
|
|
vlc_meta_AddExtra( p_dec->p_description, _("AAC extension"), psz_ext );
|
|
|
|
p_sys->b_sbr = frame.sbr; p_sys->b_ps = frame.ps;
|
|
}
|
|
|
|
/* Convert frame.channel_position to our own channel values */
|
|
p_dec->fmt_out.audio.i_physical_channels = 0;
|
|
for( i = 0; i < frame.channels; i++ )
|
|
{
|
|
/* Find the channel code */
|
|
for( j = 0; j < MAX_CHANNEL_POSITIONS; j++ )
|
|
{
|
|
if( frame.channel_position[i] == pi_channels_in[j] )
|
|
break;
|
|
}
|
|
if( j >= MAX_CHANNEL_POSITIONS )
|
|
{
|
|
msg_Warn( p_dec, "unknown channel ordering" );
|
|
/* Invent something */
|
|
j = i;
|
|
}
|
|
/* */
|
|
p_sys->pi_channel_positions[i] = pi_channels_out[j];
|
|
if( p_dec->fmt_out.audio.i_physical_channels & pi_channels_out[j] )
|
|
frame.channels--; /* We loose a duplicated channel */
|
|
else
|
|
p_dec->fmt_out.audio.i_physical_channels |= pi_channels_out[j];
|
|
}
|
|
p_dec->fmt_out.audio.i_original_channels =
|
|
p_dec->fmt_out.audio.i_physical_channels;
|
|
|
|
p_out = decoder_NewAudioBuffer(p_dec, frame.samples/frame.channels);
|
|
if( p_out == NULL )
|
|
{
|
|
p_sys->i_buffer = 0;
|
|
block_Release( p_block );
|
|
return NULL;
|
|
}
|
|
|
|
p_out->start_date = aout_DateGet( &p_sys->date );
|
|
p_out->end_date = aout_DateIncrement( &p_sys->date, frame.samples / frame.channels );
|
|
|
|
DoReordering( (uint32_t *)p_out->p_buffer, samples,
|
|
frame.samples / frame.channels, frame.channels,
|
|
p_sys->pi_channel_positions );
|
|
|
|
p_sys->i_buffer -= frame.bytesconsumed;
|
|
if( p_sys->i_buffer > 0 )
|
|
{
|
|
memmove( p_sys->p_buffer, &p_sys->p_buffer[frame.bytesconsumed],
|
|
p_sys->i_buffer );
|
|
}
|
|
|
|
return p_out;
|
|
}
|
|
|
|
block_Release( p_block );
|
|
return NULL;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* Close:
|
|
*****************************************************************************/
|
|
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;
|
|
|
|
faacDecClose( p_sys->hfaad );
|
|
free( p_sys->p_buffer );
|
|
free( p_sys );
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* DoReordering: do some channel re-ordering (the ac3 channel order is
|
|
* different from the aac one).
|
|
*****************************************************************************/
|
|
static void DoReordering( uint32_t *p_out, uint32_t *p_in, int i_samples,
|
|
int i_nb_channels, uint32_t *pi_chan_positions )
|
|
{
|
|
int pi_chan_table[MAX_CHANNEL_POSITIONS];
|
|
int i, j, k;
|
|
|
|
/* Find the channels mapping */
|
|
for( i = 0, j = 0; i < MAX_CHANNEL_POSITIONS; i++ )
|
|
{
|
|
for( k = 0; k < i_nb_channels; k++ )
|
|
{
|
|
if( pi_channels_ordered[i] == pi_chan_positions[k] )
|
|
{
|
|
pi_chan_table[k] = j++;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Do the actual reordering */
|
|
if( vlc_CPU() & CPU_CAPABILITY_FPU )
|
|
for( i = 0; i < i_samples; i++ )
|
|
for( j = 0; j < i_nb_channels; j++ )
|
|
p_out[i * i_nb_channels + pi_chan_table[j]] =
|
|
p_in[i * i_nb_channels + j];
|
|
else
|
|
for( i = 0; i < i_samples; i++ )
|
|
for( j = 0; j < i_nb_channels; j++ )
|
|
((uint16_t *)p_out)[i * i_nb_channels + pi_chan_table[j]] =
|
|
((uint16_t *)p_in)[i * i_nb_channels + j];
|
|
}
|
|
|