root/modules/demux/avi/avi.c

/*****************************************************************************
 * avi.c : AVI file Stream input module for vlc
 *****************************************************************************
 * Copyright (C) 2001-2004 the VideoLAN team
 * $Id$
 * 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., 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_interface.h>

#include <vlc_meta.h>
#include <vlc_codecs.h>
#include <vlc_charset.h>

#include "libavi.h"

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/

#define INTERLEAVE_TEXT N_("Force interleaved method" )
#define INTERLEAVE_LONGTEXT N_( "Force interleaved method." )

#define INDEX_TEXT N_("Force index creation")
#define INDEX_LONGTEXT N_( \
    "Recreate a index for the AVI file. Use this if your AVI file is damaged "\
    "or incomplete (not seekable)." )

static int  Open ( vlc_object_t * );
static void Close( vlc_object_t * );

static const int pi_index[] = {0,1,2};

static const char *const ppsz_indexes[] = { N_("Ask"), N_("Always fix"),
                                N_("Never fix") };

vlc_module_begin();
    set_shortname( "AVI" );
    set_description( N_("AVI demuxer") );
    set_capability( "demux", 212 );
    set_category( CAT_INPUT );
    set_subcategory( SUBCAT_INPUT_DEMUX );

    add_bool( "avi-interleaved", 0, NULL,
              INTERLEAVE_TEXT, INTERLEAVE_LONGTEXT, true );
    add_integer( "avi-index", 0, NULL,
              INDEX_TEXT, INDEX_LONGTEXT, false );
        change_integer_list( pi_index, ppsz_indexes, NULL );

    set_callbacks( Open, Close );
vlc_module_end();

/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
static int Control         ( demux_t *, int, va_list );
static int Seek            ( demux_t *, mtime_t, int );
static int Demux_Seekable  ( demux_t * );
static int Demux_UnSeekable( demux_t * );

#define __ABS( x ) ( (x) < 0 ? (-(x)) : (x) )

typedef struct
{
    vlc_fourcc_t i_fourcc;
    off_t        i_pos;
    uint32_t     i_size;
    vlc_fourcc_t i_type;     /* only for AVIFOURCC_LIST */

    uint8_t      i_peek[8];  /* first 8 bytes */

    unsigned int i_stream;
    unsigned int i_cat;
} avi_packet_t;


typedef struct
{
    vlc_fourcc_t i_id;
    uint32_t     i_flags;
    off_t        i_pos;
    uint32_t     i_length;
    uint32_t     i_lengthtotal;

} avi_entry_t;

typedef struct
{
    bool      b_activated;

    unsigned int    i_cat; /* AUDIO_ES, VIDEO_ES */
    vlc_fourcc_t    i_codec;

    int             i_rate;
    int             i_scale;
    int             i_samplesize;

    es_out_id_t     *p_es;

    /* Avi Index */
    avi_entry_t     *p_index;
    unsigned int    i_idxnb;
    unsigned int    i_idxmax;

    unsigned int    i_idxposc;  /* numero of chunk */
    unsigned int    i_idxposb;  /* byte in the current chunk */

    /* extra information given to the decoder */
    void            *p_extra;

    /* For VBR audio only */
    unsigned int    i_blockno;
    unsigned int    i_blocksize;

    /* For muxed streams */
    stream_t        *p_out_muxed;
} avi_track_t;

struct demux_sys_t
{
    mtime_t i_time;
    mtime_t i_length;

    bool  b_seekable;
    bool  b_muxed;
    avi_chunk_t ck_root;

    bool  b_odml;

    off_t   i_movi_begin;
    off_t   i_movi_lastchunk_pos;   /* XXX position of last valid chunk */

    /* number of streams and information */
    unsigned int i_track;
    avi_track_t  **track;

    /* meta */
    vlc_meta_t  *meta;
};

static inline off_t __EVEN( off_t i )
{
    return (i & 1) ? i + 1 : i;
}

static mtime_t AVI_PTSToChunk( avi_track_t *, mtime_t i_pts );
static mtime_t AVI_PTSToByte ( avi_track_t *, mtime_t i_pts );
static mtime_t AVI_GetDPTS   ( avi_track_t *, int64_t i_count );
static mtime_t AVI_GetPTS    ( avi_track_t * );


static int AVI_StreamChunkFind( demux_t *, unsigned int i_stream );
static int AVI_StreamChunkSet ( demux_t *,
                                unsigned int i_stream, unsigned int i_ck );
static int AVI_StreamBytesSet ( demux_t *,
                                unsigned int i_stream, off_t   i_byte );

vlc_fourcc_t AVI_FourccGetCodec( unsigned int i_cat, vlc_fourcc_t );
static int   AVI_GetKeyFlag    ( vlc_fourcc_t , uint8_t * );

static int AVI_PacketGetHeader( demux_t *, avi_packet_t *p_pk );
static int AVI_PacketNext     ( demux_t * );
static int AVI_PacketRead     ( demux_t *, avi_packet_t *, block_t **);
static int AVI_PacketSearch   ( demux_t * );

static void AVI_IndexLoad    ( demux_t * );
static void AVI_IndexCreate  ( demux_t * );
static void AVI_IndexAddEntry( demux_sys_t *, int, avi_entry_t * );

static mtime_t  AVI_MovieGetLength( demux_t * );

/*****************************************************************************
 * Stream management
 *****************************************************************************/
static int        AVI_TrackSeek  ( demux_t *, int, mtime_t );
static int        AVI_TrackStopFinishedStreams( demux_t *);

/* Remarks:
 - For VBR mp3 stream:
    count blocks by rounded-up chunksizes instead of chunks
    we need full emulation of dshow avi demuxer bugs :(
    fixes silly nandub-style a-v delaying in avi with vbr mp3...
    (from mplayer 2002/08/02)
 - to complete....
 */

/*****************************************************************************
 * Open: check file and initializes AVI structures
 *****************************************************************************/
static int Open( vlc_object_t * p_this )
{
    demux_t  *p_demux = (demux_t *)p_this;
    demux_sys_t     *p_sys;

    bool       b_index = false;
    int              i_do_index;

    avi_chunk_t         ck_riff;
    avi_chunk_list_t    *p_riff = (avi_chunk_list_t*)&ck_riff;
    avi_chunk_list_t    *p_hdrl, *p_movi;
    avi_chunk_avih_t    *p_avih;

    unsigned int i_track;
    unsigned int i, i_peeker;

    const uint8_t *p_peek;

    /* Is it an avi file ? */
    if( stream_Peek( p_demux->s, &p_peek, 200 ) < 200 ) return VLC_EGENERIC;

    for( i_peeker = 0; i_peeker < 188; i_peeker++ )
    {
        if( !strncmp( (char *)&p_peek[0], "RIFF", 4 ) && !strncmp( (char *)&p_peek[8], "AVI ", 4 ) )
            break;
        if( !strncmp( (char *)&p_peek[0], "ON2 ", 4 ) && !strncmp( (char *)&p_peek[8], "ON2f", 4 ) )
            break;
        p_peek++;
    }
    if( i_peeker == 188 )
    {
        return VLC_EGENERIC;
    }

    /* Initialize input  structures. */
    p_sys = p_demux->p_sys = malloc( sizeof(demux_sys_t) );
    memset( p_sys, 0, sizeof( demux_sys_t ) );
    p_sys->i_time   = 0;
    p_sys->i_length = 0;
    p_sys->i_movi_lastchunk_pos = 0;
    p_sys->b_odml   = false;
    p_sys->b_muxed  = false;
    p_sys->i_track  = 0;
    p_sys->track    = NULL;
    p_sys->meta     = NULL;

    stream_Control( p_demux->s, STREAM_CAN_FASTSEEK, &p_sys->b_seekable );

    p_demux->pf_control = Control;
    p_demux->pf_demux = Demux_Seekable;

    /* For unseekable stream, automaticaly use Demux_UnSeekable */
    if( !p_sys->b_seekable || config_GetInt( p_demux, "avi-interleaved" ) )
    {
        p_demux->pf_demux = Demux_UnSeekable;
    }

    if( i_peeker > 0 )
    {
        stream_Read( p_demux->s, NULL, i_peeker );
    }

    if( AVI_ChunkReadRoot( p_demux->s, &p_sys->ck_root ) )
    {
        msg_Err( p_demux, "avi module discarded (invalid file)" );
        return VLC_EGENERIC;
    }

    if( AVI_ChunkCount( &p_sys->ck_root, AVIFOURCC_RIFF ) > 1 )
    {
        unsigned int i_count =
            AVI_ChunkCount( &p_sys->ck_root, AVIFOURCC_RIFF );

        msg_Warn( p_demux, "multiple riff -> OpenDML ?" );
        for( i = 1; i < i_count; i++ )
        {
            avi_chunk_list_t *p_sysx;

            p_sysx = AVI_ChunkFind( &p_sys->ck_root, AVIFOURCC_RIFF, i );
            if( p_sysx->i_type == AVIFOURCC_AVIX )
            {
                msg_Warn( p_demux, "detected OpenDML file" );
                p_sys->b_odml = true;
                break;
            }
        }
    }

    p_riff  = AVI_ChunkFind( &p_sys->ck_root, AVIFOURCC_RIFF, 0 );
    p_hdrl  = AVI_ChunkFind( p_riff, AVIFOURCC_hdrl, 0 );
    p_movi  = AVI_ChunkFind( p_riff, AVIFOURCC_movi, 0 );

    if( !p_hdrl || !p_movi )
    {
        msg_Err( p_demux, "avi module discarded (invalid file)" );
        goto error;
    }

    if( !( p_avih = AVI_ChunkFind( p_hdrl, AVIFOURCC_avih, 0 ) ) )
    {
        msg_Err( p_demux, "cannot find avih chunk" );
        goto error;
    }
    i_track = AVI_ChunkCount( p_hdrl, AVIFOURCC_strl );
    if( p_avih->i_streams != i_track )
    {
        msg_Warn( p_demux,
                  "found %d stream but %d are declared",
                  i_track, p_avih->i_streams );
    }
    if( i_track == 0 )
    {
        msg_Err( p_demux, "no stream defined!" );
        goto error;
    }

    /* print information on streams */
    msg_Dbg( p_demux, "AVIH: %d stream, flags %s%s%s%s ",
             i_track,
             p_avih->i_flags&AVIF_HASINDEX?" HAS_INDEX":"",
             p_avih->i_flags&AVIF_MUSTUSEINDEX?" MUST_USE_INDEX":"",
             p_avih->i_flags&AVIF_ISINTERLEAVED?" IS_INTERLEAVED":"",
             p_avih->i_flags&AVIF_TRUSTCKTYPE?" TRUST_CKTYPE":"" );
    if( ( p_sys->meta = vlc_meta_New() ) )
    {
        char buffer[200];
        sprintf( buffer, "%s%s%s%s",
                 p_avih->i_flags&AVIF_HASINDEX?" HAS_INDEX":"",
                 p_avih->i_flags&AVIF_MUSTUSEINDEX?" MUST_USE_INDEX":"",
                 p_avih->i_flags&AVIF_ISINTERLEAVED?" IS_INTERLEAVED":"",
                 p_avih->i_flags&AVIF_TRUSTCKTYPE?" TRUST_CKTYPE":"" );
        vlc_meta_SetSetting( p_sys->meta, buffer );
    }

    /* now read info on each stream and create ES */
    for( i = 0 ; i < i_track; i++ )
    {
        avi_track_t           *tk     = malloc( sizeof( avi_track_t ) );
        if( !tk )
            goto error;

        avi_chunk_list_t      *p_strl = AVI_ChunkFind( p_hdrl, AVIFOURCC_strl, i );
        avi_chunk_strh_t      *p_strh = AVI_ChunkFind( p_strl, AVIFOURCC_strh, 0 );
        avi_chunk_STRING_t    *p_strn = AVI_ChunkFind( p_strl, AVIFOURCC_strn, 0 );
        avi_chunk_strf_auds_t *p_auds = NULL;
        avi_chunk_strf_vids_t *p_vids = NULL;
        es_format_t fmt;

        memset( tk, 0, sizeof( avi_track_t ) );

        p_vids = (avi_chunk_strf_vids_t*)AVI_ChunkFind( p_strl, AVIFOURCC_strf, 0 );
        p_auds = (avi_chunk_strf_auds_t*)AVI_ChunkFind( p_strl, AVIFOURCC_strf, 0 );

        if( p_strl == NULL || p_strh == NULL || p_auds == NULL || p_vids == NULL )
        {
            msg_Warn( p_demux, "stream[%d] incomplete", i );
            continue;
        }

        tk->i_rate  = p_strh->i_rate;
        tk->i_scale = p_strh->i_scale;
        tk->i_samplesize = p_strh->i_samplesize;
        msg_Dbg( p_demux, "stream[%d] rate:%d scale:%d samplesize:%d",
                 i, tk->i_rate, tk->i_scale, tk->i_samplesize );

        switch( p_strh->i_type )
        {
            case( AVIFOURCC_auds ):
                tk->i_cat   = AUDIO_ES;
                tk->i_codec = AVI_FourccGetCodec( AUDIO_ES,
                                                  p_auds->p_wf->wFormatTag );

                tk->i_blocksize = p_auds->p_wf->nBlockAlign;
                if( tk->i_blocksize == 0 )
                {
                    if( p_auds->p_wf->wFormatTag == 1 )
                        tk->i_blocksize = p_auds->p_wf->nChannels * (p_auds->p_wf->wBitsPerSample/8);
                    else
                        tk->i_blocksize = 1;
                }
                else if( tk->i_samplesize != 0 && tk->i_samplesize != tk->i_blocksize )
                {
                    msg_Warn( p_demux, "track[%d] samplesize=%d and blocksize=%d are not equal."
                                       "Using blocksize as a workaround.",
                                       i, tk->i_samplesize, tk->i_blocksize );
                    tk->i_samplesize = tk->i_blocksize;
                }

                if( tk->i_codec == VLC_FOURCC( 'v', 'o', 'r', 'b' ) )
                {
                    tk->i_blocksize = 0; /* fix vorbis VBR decoding */
                }

                es_format_Init( &fmt, AUDIO_ES, tk->i_codec );

                fmt.audio.i_channels        = p_auds->p_wf->nChannels;
                fmt.audio.i_rate            = p_auds->p_wf->nSamplesPerSec;
                fmt.i_bitrate               = p_auds->p_wf->nAvgBytesPerSec*8;
                fmt.audio.i_blockalign      = p_auds->p_wf->nBlockAlign;
                fmt.audio.i_bitspersample   = p_auds->p_wf->wBitsPerSample;
                fmt.b_packetized            = !tk->i_blocksize;

                msg_Dbg( p_demux,
                    "stream[%d] audio(0x%x) %d channels %dHz %dbits",
                    i, p_auds->p_wf->wFormatTag, p_auds->p_wf->nChannels,
                    p_auds->p_wf->nSamplesPerSec, 
                    p_auds->p_wf->wBitsPerSample );

                fmt.i_extra = __MIN( p_auds->p_wf->cbSize,
                    p_auds->i_chunk_size - sizeof(WAVEFORMATEX) );
                fmt.p_extra = tk->p_extra = malloc( fmt.i_extra );
                if( !fmt.p_extra ) goto error;
                memcpy( fmt.p_extra, &p_auds->p_wf[1], fmt.i_extra );

                /* Rewrite the vorbis headers from Xiph-like format
                 * to VLC internal format
                 *
                 * Xiph format:
                 *  - 1st byte == N, is the number of packets - 1
                 *  - Following bytes are the size of the N first packets:
                 *      while( *p == 0xFF ) { size += 0xFF; p++ } size += *p;
                 *      (the size of the last packet is the size of remaining
                 *      data in the buffer)
                 *  - Finally, all the packets concatenated
                 *
                 * VLC format:
                 *  - Size of the packet on 16 bits (big endian) FIXME: should be 32 bits to be safe
                 *  - The packet itself
                 *  - Size of the next packet, and so on ...
                 */

                if( tk->i_codec == VLC_FOURCC( 'v', 'o', 'r', 'b' ) )
                {
                    uint8_t *p_extra = fmt.p_extra; 
                    size_t i_extra = fmt.i_extra;

                    if( i_extra <= 1 ) break;
                    if( *p_extra++ != 2 ) break; /* 3 packets - 1 = 2 */
                    i_extra--;

                    size_t i_identifier_len = 0;
                    while( *p_extra == 0xFF )
                    {
                        i_identifier_len += 0xFF;
                        p_extra++;
                        if( --i_extra <= 1 ) break;
                    }
                    i_identifier_len += *p_extra++;
                    if( i_identifier_len > --i_extra ) break;

                    size_t i_comment_len = 0;
                    while( *p_extra == 0xFF )
                    {
                        i_comment_len += 0xFF;
                        p_extra++;
                        if( --i_extra <= 1 ) break;
                    }
                    i_comment_len += *p_extra++;
                    if( i_comment_len > --i_extra ) break;
                    size_t i_cookbook_len = i_extra;

                    size_t i_headers_size = 3  * 2 + i_identifier_len +
                                            i_comment_len + i_cookbook_len;
                    uint8_t *p_out = malloc( i_headers_size );
                    if( !p_out ) goto error;
                    free( fmt.p_extra );
                    fmt.p_extra = tk->p_extra = p_out;
                    fmt.i_extra = i_headers_size;
                    #define copy_packet( len ) \
                        *p_out++ = len >> 8; \
                        *p_out++ = len & 0xFF; \
                        memcpy( p_out, p_extra, len ); \
                        p_out += len; \
                        p_extra += len;
                    copy_packet( i_identifier_len );
                    copy_packet( i_comment_len );
                    copy_packet( i_cookbook_len );
                    #undef copy_packet
                    break;
                }
                break;

            case( AVIFOURCC_vids ):
                tk->i_cat   = VIDEO_ES;
                tk->i_codec = AVI_FourccGetCodec( VIDEO_ES,
                                                  p_vids->p_bih->biCompression );
                if( p_vids->p_bih->biCompression == 0x00 )
                {
                    switch( p_vids->p_bih->biBitCount )
                    {
                        case 32:
                            tk->i_codec = VLC_FOURCC('R','V','3','2');
                            break;
                        case 24:
                            tk->i_codec = VLC_FOURCC('R','V','2','4');
                            break;
                        case 16:
                            /* tk->i_codec = VLC_FOURCC('R','V','1','6');*/
                            /* break;*/
                        case 15:
                            tk->i_codec = VLC_FOURCC('R','V','1','5');
                            break;
                        case 9:
                            tk->i_codec = VLC_FOURCC( 'Y', 'V', 'U', '9' ); /* <- TODO check that */
                            break;
                        case 8:
                            tk->i_codec = VLC_FOURCC('Y','8','0','0');
                            break;
                    }
                    es_format_Init( &fmt, VIDEO_ES, tk->i_codec );

                    if( p_vids->p_bih->biBitCount == 24 )
                    {
                        /* This is in BGR format */
                        fmt.video.i_bmask = 0x00ff0000;
                        fmt.video.i_gmask = 0x0000ff00;
                        fmt.video.i_rmask = 0x000000ff;
                    }
                }
                else
                {
                    es_format_Init( &fmt, VIDEO_ES, p_vids->p_bih->biCompression );
                    if( tk->i_codec == FOURCC_mp4v &&
                        !strncasecmp( (char*)&p_strh->i_handler, "XVID", 4 ) )
                    {
                        fmt.i_codec = VLC_FOURCC( 'X', 'V', 'I', 'D' );
                    }
                }
                tk->i_samplesize = 0;
                fmt.video.i_width  = p_vids->p_bih->biWidth;
                fmt.video.i_height = p_vids->p_bih->biHeight;
                fmt.video.i_bits_per_pixel = p_vids->p_bih->biBitCount;
                fmt.video.i_frame_rate = tk->i_rate;
                fmt.video.i_frame_rate_base = tk->i_scale;
                fmt.i_extra =
                    __MIN( p_vids->p_bih->biSize - sizeof( BITMAPINFOHEADER ),
                           p_vids->i_chunk_size - sizeof(BITMAPINFOHEADER) );
                fmt.p_extra = &p_vids->p_bih[1];
                msg_Dbg( p_demux, "stream[%d] video(%4.4s) %"PRIu32"x%"PRIu32" %dbpp %ffps",
                         i, (char*)&p_vids->p_bih->biCompression,
                         (uint32_t)p_vids->p_bih->biWidth,
                         (uint32_t)p_vids->p_bih->biHeight,
                         p_vids->p_bih->biBitCount,
                         (float)tk->i_rate/(float)tk->i_scale );

                if( p_vids->p_bih->biCompression == 0x00 )
                {
                    /* RGB DIB are coded from bottom to top */
                    fmt.video.i_height =
                        (unsigned int)(-(int)p_vids->p_bih->biHeight);
                }

                /* Extract palette from extradata if bpp <= 8
                 * (assumes that extradata contains only palette but appears
                 *  to be true for all palettized codecs we support) */
                if( fmt.video.i_bits_per_pixel > 0 && fmt.video.i_bits_per_pixel <= 8 )
                {
                    /* The palette is not always included in biSize */
                    fmt.i_extra = p_vids->i_chunk_size - sizeof(BITMAPINFOHEADER);
                    if( fmt.i_extra > 0 )
                    {
                        const uint8_t *p_pal = fmt.p_extra;

                        fmt.video.p_palette = calloc( sizeof(video_palette_t), 1 );
                        fmt.video.p_palette->i_entries = __MIN(fmt.i_extra/4, 256);

                        for( int i = 0; i < fmt.video.p_palette->i_entries; i++ )
                        {
                            for( int j = 0; j < 4; j++ )
                                fmt.video.p_palette->palette[i][j] = p_pal[4*i+j];
                        }
                    }
                }
                break;

            case( AVIFOURCC_txts):
                tk->i_cat   = SPU_ES;
                tk->i_codec = VLC_FOURCC( 's', 'u', 'b', 't' );
                msg_Dbg( p_demux, "stream[%d] subtitles", i );
                es_format_Init( &fmt, SPU_ES, tk->i_codec );
                break;

            case( AVIFOURCC_iavs):
            case( AVIFOURCC_ivas):
                p_sys->b_muxed = true;
                msg_Dbg( p_demux, "stream[%d] iavs with handler %4.4s", i, (char *)&p_strh->i_handler );
                if( p_strh->i_handler == FOURCC_dvsd ||
                    p_strh->i_handler == FOURCC_dvhd ||
                    p_strh->i_handler == FOURCC_dvsl ||
                    p_strh->i_handler == FOURCC_dv25 ||
                    p_strh->i_handler == FOURCC_dv50 )
                {
                    tk->p_out_muxed = stream_DemuxNew( p_demux, (char *)"rawdv", p_demux->out );
                    if( !tk->p_out_muxed )
                        msg_Err( p_demux, "could not load the DV parser" );
                    else break;
                }
                free( tk );
                continue;

            case( AVIFOURCC_mids):
                msg_Dbg( p_demux, "stream[%d] midi is UNSUPPORTED", i );

            default:
                msg_Warn( p_demux, "stream[%d] unknown type %4.4s", i, (char *)&p_strh->i_type );
                free( tk );
                continue;
        }
        if( p_strn )
        {
            /* The charset of p_strn is undefined */
            EnsureUTF8( p_strn->p_str );
            fmt.psz_description = strdup( p_strn->p_str );
        }
        if( tk->p_out_muxed == NULL )
            tk->p_es = es_out_Add( p_demux->out, &fmt );
        TAB_APPEND( p_sys->i_track, p_sys->track, tk );
    }

    if( p_sys->i_track <= 0 )
    {
        msg_Err( p_demux, "no valid track" );
        goto error;
    }

    i_do_index =  config_GetInt( p_demux, "avi-index" );
    if( i_do_index == 1 ) /* Always fix */
    {
aviindex:
        if( p_sys->b_seekable )
        {
            AVI_IndexCreate( p_demux );
        }
        else
        {
            msg_Warn( p_demux, "cannot create index (unseekable stream)" );
            AVI_IndexLoad( p_demux );
        }
    }
    else
    {
        AVI_IndexLoad( p_demux );
    }

    /* *** movie length in sec *** */
    p_sys->i_length = AVI_MovieGetLength( p_demux );
    if( p_sys->i_length < (mtime_t)p_avih->i_totalframes *
                          (mtime_t)p_avih->i_microsecperframe /
                          (mtime_t)1000000 )
    {
        msg_Warn( p_demux, "broken or missing index, 'seek' will be "
                           "approximative or will exhibit strange behavior" );
        if( i_do_index == 0 && !b_index )
        {
            if( !p_sys->b_seekable ) {
                b_index = true;
                goto aviindex;
            }
            int i_create;
            i_create = intf_UserYesNo( p_demux, _("AVI Index") ,
                        _( "This AVI file is broken. Seeking will not "
                        "work correctly.\nDo you want to "
                        "try to repair it?\n\nThis might take a long time." ),
                        _( "Repair" ), _( "Don't repair" ), _( "Cancel") );
            if( i_create == DIALOG_OK_YES )
            {
                b_index = true;
                msg_Dbg( p_demux, "Fixing AVI index" );
                goto aviindex;
            }
            else if( i_create == DIALOG_CANCELLED )
            {
                /* Kill input */
                vlc_object_kill( p_demux->p_parent );
                goto error;
            }
        }
    }

    /* fix some BeOS MediaKit generated file */
    for( i = 0 ; i < p_sys->i_track; i++ )
    {
        avi_track_t         *tk = p_sys->track[i];
        avi_chunk_list_t    *p_strl;
        avi_chunk_strh_t    *p_strh;
        avi_chunk_strf_auds_t    *p_auds;

        if( tk->i_cat != AUDIO_ES )
        {
            continue;
        }
        if( tk->i_idxnb < 1 ||
            tk->i_scale != 1 ||
            tk->i_samplesize != 0 )
        {
            continue;
        }
        p_strl = AVI_ChunkFind( p_hdrl, AVIFOURCC_strl, i );
        p_strh = AVI_ChunkFind( p_strl, AVIFOURCC_strh, 0 );
        p_auds = AVI_ChunkFind( p_strl, AVIFOURCC_strf, 0 );

        if( p_auds->p_wf->wFormatTag != WAVE_FORMAT_PCM &&
            (unsigned int)tk->i_rate == p_auds->p_wf->nSamplesPerSec )
        {
            int64_t i_track_length =
                tk->p_index[tk->i_idxnb-1].i_length +
                tk->p_index[tk->i_idxnb-1].i_lengthtotal;
            mtime_t i_length = (mtime_t)p_avih->i_totalframes *
                               (mtime_t)p_avih->i_microsecperframe;

            if( i_length == 0 )
            {
                msg_Warn( p_demux, "track[%d] cannot be fixed (BeOS MediaKit generated)", i );
                continue;
            }
            tk->i_samplesize = 1;
            tk->i_rate       = i_track_length  * (int64_t)1000000/ i_length;
            msg_Warn( p_demux, "track[%d] fixed with rate=%d scale=%d (BeOS MediaKit generated)", i, tk->i_rate, tk->i_scale );
        }
    }

    if( p_sys->b_seekable )
    {
        /* we have read all chunk so go back to movi */
        stream_Seek( p_demux->s, p_movi->i_chunk_pos );
    }
    /* Skip movi header */
    stream_Read( p_demux->s, NULL, 12 );

    p_sys->i_movi_begin = p_movi->i_chunk_pos;
    return VLC_SUCCESS;

error:
    if( p_sys->meta )
    {
        vlc_meta_Delete( p_sys->meta );
    }
    AVI_ChunkFreeRoot( p_demux->s, &p_sys->ck_root );
    free( p_sys );
    return VLC_EGENERIC;
}

/*****************************************************************************
 * Close: frees unused data
 *****************************************************************************/
static void Close ( vlc_object_t * p_this )
{
    demux_t *    p_demux = (demux_t *)p_this;
    unsigned int i;
    demux_sys_t *p_sys = p_demux->p_sys  ;

    for( i = 0; i < p_sys->i_track; i++ )
    {
        if( p_sys->track[i] )
        {
            if( p_sys->track[i]->p_out_muxed )
                stream_DemuxDelete( p_sys->track[i]->p_out_muxed );
            free( p_sys->track[i]->p_index );
            free( p_sys->track[i]->p_extra );
            free( p_sys->track[i] );
        }
    }
    free( p_sys->track );
    AVI_ChunkFreeRoot( p_demux->s, &p_sys->ck_root );
    vlc_meta_Delete( p_sys->meta );

    free( p_sys );
}

/*****************************************************************************
 * Demux_Seekable: reads and demuxes data packets for stream seekable
 *****************************************************************************
 * AVIDemux: reads and demuxes data packets
 *****************************************************************************
 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
 *****************************************************************************/
typedef struct
{
    bool b_ok;

    int i_toread;

    off_t i_posf; /* where we will read :
                   if i_idxposb == 0 : begining of chunk (+8 to acces data)
                   else : point on data directly */
} avi_track_toread_t;

static int Demux_Seekable( demux_t *p_demux )
{
    demux_sys_t *p_sys = p_demux->p_sys;

    unsigned int i_track_count = 0;
    unsigned int i_track;
    bool b_stream;
    /* cannot be more than 100 stream (dcXX or wbXX) */
    avi_track_toread_t toread[100];


    /* detect new selected/unselected streams */
    for( i_track = 0; i_track < p_sys->i_track; i_track++ )
    {
        avi_track_t *tk = p_sys->track[i_track];
        bool  b;

        if( p_sys->b_muxed && tk->p_out_muxed )
        {
            i_track_count++;
            tk->b_activated = true;
            continue;
        }

        es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE, tk->p_es, &b );
        if( b && !tk->b_activated )
        {