/*****************************************************************************

 * tta.c : The Lossless True Audio parser

 *****************************************************************************

 * Copyright (C) 2006 VLC authors and VideoLAN

 *

 * Authors: Derk-Jan Hartman <hartman 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

 *****************************************************************************/

#ifdef HAVE_CONFIG_H

# include "config.h"

#endif

#include <vlc_common.h>

#include <vlc_plugin.h>

#include <vlc_demux.h>

#include <vlc_codec.h>

#include <math.h>

#include <limits.h>

/*****************************************************************************

 * Module descriptor

 *****************************************************************************/

static int  Open  ( vlc_object_t * );

static void Close ( vlc_object_t * );

vlc_module_begin ()

    set_shortname( "TTA" )

    set_description( N_("TTA demuxer") )

    set_subcategory( SUBCAT_INPUT_DEMUX )

    set_capability( "demux", 145 )

    set_callbacks( Open, Close )

    add_shortcut( "tta" )

vlc_module_end ()

#define TTA_FRAMETIME 1.04489795918367346939

/*****************************************************************************

 * Local prototypes

 *****************************************************************************/

static int Demux  ( demux_t * );

static int Control( demux_t *, int, va_list );

typedef struct

{

    /* */

    es_out_id_t *p_es;

    /* */

    uint32_t i_totalframes;

    uint32_t i_currentframe;

    uint32_t *pi_seektable;

    uint32_t i_datalength;

    int      i_framelength;

    /* */

    vlc_meta_t     *p_meta;

    int64_t        i_start;

} demux_sys_t;

/*****************************************************************************

 * Open: initializes ES structures

 *****************************************************************************/

static int Open( vlc_object_t * p_this )

{

    demux_t     *p_demux = (demux_t*)p_this;

    demux_sys_t *p_sys;

    es_format_t fmt;

    const uint8_t *p_peek;

    uint8_t     p_header[22];

    uint8_t     *p_fullheader;

    int         i_seektable_size = 0;

    //char        psz_info[4096];

    //module_t    *p_id3;

    if( vlc_stream_Peek( p_demux->s, &p_peek, 4 ) < 4 )

        return VLC_EGENERIC;

    if( memcmp( p_peek, "TTA1", 4 ) )

    {

        if( !p_demux->obj.force )

            return VLC_EGENERIC;

        /* User forced */

        msg_Err( p_demux, "this doesn't look like a true-audio stream, "

                 "continuing anyway" );

    }

    if( vlc_stream_Read( p_demux->s, p_header, 22 ) < 22 )

        return VLC_EGENERIC;

    /* Fill p_demux fields */

    p_demux->pf_demux = Demux;

    p_demux->pf_control = Control;

    p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );

    if( !p_sys )

        return VLC_ENOMEM;

    p_sys->pi_seektable = NULL;

    /* Read the metadata */

    es_format_Init( &fmt, AUDIO_ES, VLC_CODEC_TTA );

    fmt.audio.i_channels = GetWLE( &p_header[6] );

    fmt.audio.i_bitspersample = GetWLE( &p_header[8] );

    fmt.audio.i_rate = GetDWLE( &p_header[10] );

    if( fmt.audio.i_rate == 0 || /* Avoid divide by 0 */

        fmt.audio.i_rate > ( 1 << 20 ) /* Avoid i_framelength overflow */ )

    {

        msg_Warn( p_demux, "Wrong sample rate" );

        goto error;

    }

    p_sys->i_datalength = GetDWLE( &p_header[14] );

    p_sys->i_framelength = TTA_FRAMETIME * fmt.audio.i_rate;

    p_sys->i_totalframes = p_sys->i_datalength / p_sys->i_framelength +

                          ((p_sys->i_datalength % p_sys->i_framelength) != 0);

    p_sys->i_currentframe = 0;

    if( (INT_MAX - 22 - 4) / sizeof(*p_sys->pi_seektable) < p_sys->i_totalframes )

        goto error;

    i_seektable_size = sizeof(*p_sys->pi_seektable)*p_sys->i_totalframes;

    /* Store the header and Seektable for avcodec */

    fmt.i_extra = 22 + i_seektable_size + 4;

    fmt.p_extra = p_fullheader = malloc( fmt.i_extra );

    if( !p_fullheader )

    {

        fmt.i_extra = 0;

        goto error;

    }

    memcpy( p_fullheader, p_header, 22 );

    p_fullheader += 22;

    if( vlc_stream_Read( p_demux->s, p_fullheader, i_seektable_size )

             != i_seektable_size )

        goto error;

    p_sys->pi_seektable = calloc( p_sys->i_totalframes, sizeof(*p_sys->pi_seektable) );

    if( !p_sys->pi_seektable )

        goto error;

    for( uint32_t i = 0; i < p_sys->i_totalframes; i++ )

    {

        p_sys->pi_seektable[i] = GetDWLE( p_fullheader );

        p_fullheader += 4;

    }

    if( 4 != vlc_stream_Read( p_demux->s, p_fullheader, 4 ) ) /* CRC */

        goto error;

    p_fullheader += 4;

    p_sys->p_es = es_out_Add( p_demux->out, &fmt );

    if( unlikely(!p_sys->p_es) )

        goto error;

    p_sys->i_start = p_fullheader - (uint8_t *)fmt.p_extra;

    es_format_Clean( &fmt );

    return VLC_SUCCESS;

error:

    es_format_Clean( &fmt );

    Close( p_this );

    return VLC_EGENERIC;

}

/*****************************************************************************

 * Close: frees unused data

 *****************************************************************************/

static void Close( vlc_object_t * p_this )

{

    demux_t        *p_demux = (demux_t*)p_this;

    demux_sys_t    *p_sys = p_demux->p_sys;

    free( p_sys->pi_seektable );

    free( p_sys );

}

/*****************************************************************************

 * Demux:

 *****************************************************************************

 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise

 *****************************************************************************/

static int Demux( demux_t *p_demux )

{

    demux_sys_t *p_sys = p_demux->p_sys;

    block_t     *p_data;

    if( p_sys->i_currentframe >= p_sys->i_totalframes )

        return VLC_DEMUXER_EOF;

    p_data = vlc_stream_Block( p_demux->s,

                               p_sys->pi_seektable[p_sys->i_currentframe] );

    if( p_data == NULL )

        return VLC_DEMUXER_EOF;

    p_data->i_dts = p_data->i_pts = VLC_TICK_0 + vlc_tick_from_sec( p_sys->i_currentframe * TTA_FRAMETIME );

    p_sys->i_currentframe++;

    es_out_SetPCR( p_demux->out, p_data->i_dts );

    if( p_sys->p_es )

        es_out_Send( p_demux->out, p_sys->p_es, p_data );

    return VLC_DEMUXER_SUCCESS;

}

/*****************************************************************************

 * Control:

 *****************************************************************************/

static int Control( demux_t *p_demux, int i_query, va_list args )

{

    demux_sys_t *p_sys = p_demux->p_sys;

    double   f, *pf;

    int64_t i64;

    switch( i_query )

    {

        case DEMUX_CAN_SEEK:

            return vlc_stream_vaControl( p_demux->s, i_query, args );

        case DEMUX_GET_POSITION:

            pf = va_arg( args, double * );

            i64 = stream_Size( p_demux->s ) - p_sys->i_start;

            if( i64 > 0 )

            {

                *pf = (double)(vlc_stream_Tell( p_demux->s ) - p_sys->i_start )/ (double)i64;

            }

            else

            {

                *pf = 0.0;

            }

            return VLC_SUCCESS;

        case DEMUX_SET_POSITION:

            f = va_arg( args, double );

            i64 = (int64_t)(f * (stream_Size( p_demux->s ) - p_sys->i_start));

            if( i64 > 0 )

            {

                int64_t tmp = 0;

                uint32_t i;

                for( i=0; i < p_sys->i_totalframes && tmp+p_sys->pi_seektable[i] < i64; i++)

                {

                    tmp += p_sys->pi_seektable[i];

                }

                if( vlc_stream_Seek( p_demux->s, tmp+p_sys->i_start ) )

                    return VLC_EGENERIC;

                p_sys->i_currentframe = i;

                return VLC_SUCCESS;

            }

            return VLC_EGENERIC;

        case DEMUX_GET_LENGTH:

            *va_arg( args, vlc_tick_t * ) =

                vlc_tick_from_sec( p_sys->i_totalframes * TTA_FRAMETIME );

            return VLC_SUCCESS;

        case DEMUX_GET_TIME:

            *va_arg( args, vlc_tick_t * ) = vlc_tick_from_sec( p_sys->i_currentframe * TTA_FRAMETIME );

            return VLC_SUCCESS;

        case DEMUX_CAN_PAUSE:

        case DEMUX_SET_PAUSE_STATE:

        case DEMUX_CAN_CONTROL_PACE:

        case DEMUX_GET_PTS_DELAY:

            return demux_vaControlHelper( p_demux->s, 0, p_sys->i_datalength,

                                          0, p_sys->i_framelength, i_query, args );

        default:

            return VLC_EGENERIC;

    }

}