faad.c 9.65 KB
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/*****************************************************************************
 * decoder.c: AAC decoder using libfaad2
 *****************************************************************************
 * Copyright (C) 2001, 2003 VideoLAN
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 * $Id: faad.c,v 1.7 2003/12/03 12:19:55 fenrir Exp $
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 *
 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

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#include <vlc/vlc.h>
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#include <vlc/aout.h>
#include <vlc/decoder.h>

#include <faad.h>

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
static int  Open( vlc_object_t * );
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static void Close( vlc_object_t * );
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vlc_module_begin();
    set_description( _("AAC audio decoder (using libfaad2)") );
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    set_capability( "decoder", 100 );
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    set_callbacks( Open, Close );
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vlc_module_end();


/****************************************************************************
 * Local prototypes
 ****************************************************************************/
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static aout_buffer_t *DecodeBlock( decoder_t *, block_t ** );
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struct decoder_sys_t
{
    /* faad handler */
    faacDecHandle *hfaad;

    /* samples */
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    audio_date_t date;
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    /* temporary buffer */
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    uint8_t *p_buffer;
    int     i_buffer;
    int     i_buffer_size;
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};

static unsigned int pi_channels_maps[7] =
{
    0,
    AOUT_CHAN_CENTER,
    AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
    AOUT_CHAN_CENTER | AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
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    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,
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     /* FIXME */
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    AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT |
        AOUT_CHAN_REARRIGHT | AOUT_CHAN_REARCENTER
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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 Open( 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 = p_dec->p_sys;
    faacDecConfiguration *cfg;

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    if( p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','4','a') )
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    {
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        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 )
    {
        msg_Err( p_dec, "out of memory" );
        return VLC_EGENERIC;
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    }

    /* Open a faad context */
    if( ( p_sys->hfaad = faacDecOpen() ) == NULL )
    {
        msg_Err( p_dec, "Cannot initialize faad" );
        return VLC_EGENERIC;
    }

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    /* Misc init */
    aout_DateSet( &p_sys->date, 0 );
    p_dec->fmt_out.i_cat = AUDIO_ES;
    p_dec->fmt_out.i_codec = VLC_FOURCC('f','l','3','2');
    p_dec->pf_decode_audio = DecodeBlock;

    if( p_dec->fmt_in.i_extra > 0 )
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    {
        /* We have a decoder config so init the handle */
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        unsigned long i_rate;
        unsigned char i_channels;
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        if( faacDecInit2( p_sys->hfaad, p_dec->fmt_in.p_extra,
                          p_dec->fmt_in.i_extra,
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                          &i_rate, &i_channels ) < 0 )
        {
            return VLC_EGENERIC;
        }

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        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_maps[i_channels];

        aout_DateInit( &p_sys->date, i_rate );
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    }
    else
    {
        /* Will be initalised from first frame */
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        p_dec->fmt_out.audio.i_rate = 0;
        p_dec->fmt_out.audio.i_channels = 0;
        p_dec->fmt_out.audio.i_physical_channels =
            p_dec->fmt_out.audio.i_original_channels = 0;
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    }

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    /* Set the faad config */
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    cfg = faacDecGetCurrentConfiguration( p_sys->hfaad );
    cfg->outputFormat = FAAD_FMT_FLOAT;
    faacDecSetConfiguration( p_sys->hfaad, cfg );

    /* buffer */
    p_sys->i_buffer = 0;
    p_sys->i_buffer_size = 10000;
    p_sys->p_buffer = malloc( p_sys->i_buffer_size );

    return VLC_SUCCESS;
}

/*****************************************************************************
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 * DecodeBlock:
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 *****************************************************************************/
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static aout_buffer_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
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{
    decoder_sys_t *p_sys = p_dec->p_sys;
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    block_t *p_block;
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    if( !pp_block || !*pp_block ) return NULL;

    p_block = *pp_block;
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    if( p_block->b_discontinuity )
    {
        block_Release( p_block );
        return NULL;
    }

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    /* Append the block to the temporary buffer */
    if( p_sys->i_buffer_size < p_sys->i_buffer + p_block->i_buffer )
    {
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        p_sys->i_buffer_size = p_sys->i_buffer + p_block->i_buffer;
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        p_sys->p_buffer = realloc( p_sys->p_buffer, p_sys->i_buffer_size );
    }

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    if( p_block->i_buffer )
    {
        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_sys->i_buffer )
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    {
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        unsigned long i_rate;
        unsigned char i_channels;
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        /* Init faad with the first frame */
        if( faacDecInit( p_sys->hfaad,
                         p_sys->p_buffer, p_sys->i_buffer,
                         &i_rate, &i_channels ) < 0 )
        {
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            block_Release( p_block );
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            return NULL;
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        }
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        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_maps[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;
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    }

    /* Decode all data */
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    if( p_sys->i_buffer )
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    {
        void *samples;
        faacDecFrameInfo frame;
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        aout_buffer_t *p_out;
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        samples = faacDecDecode( p_sys->hfaad, &frame,
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                                 p_sys->p_buffer, p_sys->i_buffer );
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        if( frame.error > 0 )
        {
            msg_Warn( p_dec, "%s", faacDecGetErrorMessage( frame.error ) );
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            /* Flush the buffer */
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            p_sys->i_buffer = 0;
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            block_Release( p_block );
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            return NULL;
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        }
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        if( frame.channels <= 0 || frame.channels > 6 )
        {
            msg_Warn( p_dec, "invalid channels count" );
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            /* Flush the buffer */
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            p_sys->i_buffer = 0;
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            block_Release( p_block );
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            return NULL;
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        }
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        if( frame.samples <= 0 )
        {
            msg_Warn( p_dec, "decoded zero samples" );
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            /* Flush the buffer */
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            p_sys->i_buffer = 0;
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            block_Release( p_block );
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            return NULL;
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        }

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        /* We decoded a valid frame */
        if( p_dec->fmt_out.audio.i_rate != frame.samplerate )
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        {
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            aout_DateInit( &p_sys->date, frame.samplerate );
            aout_DateSet( &p_sys->date, p_block->i_pts );
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        }
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        p_block->i_pts = 0;  /* PTS is valid only once */
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        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_maps[frame.channels];
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        p_out = p_dec->pf_aout_buffer_new( p_dec,
                                           frame.samples / frame.channels );
        if( p_out == NULL )
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        {
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            p_sys->i_buffer = 0;
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            block_Release( p_block );
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            return NULL;
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        }

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        p_out->start_date = aout_DateGet( &p_sys->date );
        p_out->end_date = aout_DateIncrement( &p_sys->date,
                                              frame.samples / frame.channels );

        memcpy( p_out->p_buffer, samples, p_out->i_nb_bytes );
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        p_sys->i_buffer -= frame.bytesconsumed;
        if( p_sys->i_buffer > 0 )
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        {
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            memmove( p_sys->p_buffer, &p_sys->p_buffer[frame.bytesconsumed],
                     p_sys->i_buffer );
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        }

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        return p_out;
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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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 * Close:
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 *****************************************************************************/
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static void Close( 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 = p_dec->p_sys;

    faacDecClose( p_sys->hfaad );
    free( p_sys );
}