faad.c

VLC Player Source Code

/*****************************************************************************
 * decoder.c: AAC decoder using libfaad2
 *****************************************************************************
 * Copyright (C) 2001, 2003 the VideoLAN team
 * $Id$
 *
 * Authors: Laurent Aimar <[e-mail]>
 *          Gildas Bazin <[e-mail]>
 *
 * 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_aout.h>
#include <vlc_codec.h>
#include <vlc_input.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;

    int i_input_rate;
};

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;

    p_sys->i_input_rate = INPUT_RATE_DEFAULT;

    /* 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;
    }

    if( p_block->i_rate > 0 )
        p_sys->i_input_rate = p_block->i_rate;

    /* 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;