cdda.c

vlc源码

/*****************************************************************************
 * cdda.c : CD digital audio input module for vlc
 *****************************************************************************
 * Copyright (C) 2000, 2003 the VideoLAN team
 * $Id: accc7a4f93c8af59c30e1639fbd8b42be3fde7c4 $
 *
 * 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.
 *****************************************************************************/

/**
 * Todo:
 *   - Improve CDDB support (non-blocking, cache, ...)
 *   - Fix tracknumber in MRL
 */

/*****************************************************************************
 * Preamble
 *****************************************************************************/

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_input.h>
#include <vlc_access.h>
#include <vlc_meta.h>
#include <vlc_charset.h>

#include <vlc_codecs.h> /* For WAVEHEADER */
#include "vcd/cdrom.h"

#warning playlist code must not be used here.
#include <vlc_playlist.h>

#ifdef HAVE_LIBCDDB
#include <cddb/cddb.h>
#endif

#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif

/*****************************************************************************
 * Module descriptior
 *****************************************************************************/
static int  Open ( vlc_object_t * );
static void Close( vlc_object_t * );

#define CACHING_TEXT N_("Caching value in ms")
#define CACHING_LONGTEXT N_( \
    "Default caching value for Audio CDs. This " \
    "value should be set in milliseconds." )

vlc_module_begin();
    set_shortname( N_("Audio CD"));
    set_description( N_("Audio CD input") );
    set_capability( "access", 10 );
    set_category( CAT_INPUT );
    set_subcategory( SUBCAT_INPUT_ACCESS );
    set_callbacks( Open, Close );

    add_usage_hint( N_("[cdda:][device][@[track]]") );
    add_integer( "cdda-caching", DEFAULT_PTS_DELAY / 1000, NULL, CACHING_TEXT,
                 CACHING_LONGTEXT, true );

    add_integer( "cdda-track", -1 , NULL, NULL, NULL, true );
        change_internal();
    add_integer( "cdda-first-sector", -1, NULL, NULL, NULL, true );
        change_internal();
    add_integer( "cdda-last-sector", -1, NULL, NULL, NULL, true );
        change_internal();

    add_string( "cddb-server", "freedb.freedb.org", NULL,
                N_( "CDDB Server" ), N_( "Address of the CDDB server to use." ),
                true );
    add_integer( "cddb-port", 8880, NULL,
                N_( "CDDB port" ), N_( "CDDB Server port to use." ),
                true );
    add_shortcut( "cdda" );
    add_shortcut( "cddasimple" );
vlc_module_end();


/* how many blocks VCDRead will read in each loop */
#define CDDA_BLOCKS_ONCE 20
#define CDDA_DATA_ONCE   (CDDA_BLOCKS_ONCE * CDDA_DATA_SIZE)

/*****************************************************************************
 * Access: local prototypes
 *****************************************************************************/
struct access_sys_t
{
    vcddev_t    *vcddev;                            /* vcd device descriptor */

    /* Current position */
    int         i_sector;                                  /* Current Sector */
    int *       p_sectors;                                  /* Track sectors */

    /* Wave header for the output data */
    WAVEHEADER  waveheader;
    bool  b_header;

    int         i_track;
    int         i_first_sector;
    int         i_last_sector;

#ifdef HAVE_LIBCDDB
    cddb_disc_t *p_disc;
#endif
};

static block_t *Block( access_t * );
static int      Seek( access_t *, int64_t );
static int      Control( access_t *, int, va_list );

static int GetTracks( access_t *p_access, playlist_t *p_playlist,
                      playlist_item_t *p_parent );

#ifdef HAVE_LIBCDDB
static void GetCDDBInfo( access_t *p_access, int i_titles, int *p_sectors );
#endif

/*****************************************************************************
 * Open: open cdda
 *****************************************************************************/
static int Open( vlc_object_t *p_this )
{
    access_t     *p_access = (access_t*)p_this;
    access_sys_t *p_sys;
    vcddev_t *vcddev;
    char *psz_name;
    int i_mrl_tracknum = -1;
    int i_ret;

    if( !p_access->psz_path || !*p_access->psz_path )
    {
        /* Only when selected */
        if( !p_this->b_force ) return VLC_EGENERIC;

        psz_name = var_CreateGetString( p_this, "cd-audio" );
        if( !psz_name || !*psz_name )
        {
            free( psz_name );
            return VLC_EGENERIC;
        }
    }
    else psz_name = ToLocaleDup( p_access->psz_path );

#ifdef WIN32
    if( psz_name[0] && psz_name[1] == ':' &&
        psz_name[2] == '\\' && psz_name[3] == '\0' ) psz_name[2] = '\0';
#endif

    /* Open CDDA */
    if( (vcddev = ioctl_Open( VLC_OBJECT(p_access), psz_name )) == NULL )
    {
        msg_Warn( p_access, "could not open %s", psz_name );
        free( psz_name );
        return VLC_EGENERIC;
    }
    free( psz_name );

    /* Set up p_access */
    STANDARD_BLOCK_ACCESS_INIT
    p_sys->vcddev = vcddev;

   /* Do we play a single track ? */
   p_sys->i_track = var_CreateGetInteger( p_access, "cdda-track" );

   if( p_sys->i_track < 0 && i_mrl_tracknum <= 0 )
   {
        /* We only do separate items if the whole disc is requested */
        playlist_t *p_playlist = pl_Yield( p_access );

        i_ret = -1;
        if( p_playlist )
        {
            input_thread_t *p_input = (input_thread_t*)vlc_object_find( p_access, VLC_OBJECT_INPUT, FIND_PARENT );
            if( p_input )
            {
                input_item_t *p_current = input_GetItem( p_input );
                playlist_item_t *p_item;

                if( p_playlist->status.p_item->p_input == p_current )
                    p_item = p_playlist->status.p_item;
                else
                    p_item = playlist_ItemGetByInput( p_playlist, p_current, pl_Unlocked );

                if( p_item )
                    i_ret = GetTracks( p_access, p_playlist, p_item );
                else
                    msg_Dbg( p_playlist, "unable to find item in playlist");
                vlc_object_release( p_input );
            }
            pl_Release( p_access );
        }
        if( i_ret < 0 )
            goto error;
    }
    else
    {
        /* Build a WAV header for the output data */
        memset( &p_sys->waveheader, 0, sizeof(WAVEHEADER) );
        SetWLE( &p_sys->waveheader.Format, 1 ); /*WAVE_FORMAT_PCM*/
        SetWLE( &p_sys->waveheader.BitsPerSample, 16);
        p_sys->waveheader.MainChunkID = VLC_FOURCC('R', 'I', 'F', 'F');
        p_sys->waveheader.Length = 0;               /* we just don't know */
        p_sys->waveheader.ChunkTypeID = VLC_FOURCC('W', 'A', 'V', 'E');
        p_sys->waveheader.SubChunkID = VLC_FOURCC('f', 'm', 't', ' ');
        SetDWLE( &p_sys->waveheader.SubChunkLength, 16);
        SetWLE( &p_sys->waveheader.Modus, 2);
        SetDWLE( &p_sys->waveheader.SampleFreq, 44100);
        SetWLE( &p_sys->waveheader.BytesPerSample,
                    2 /*Modus*/ * 16 /*BitsPerSample*/ / 8 );
        SetDWLE( &p_sys->waveheader.BytesPerSec,
                    2*16/8 /*BytesPerSample*/ * 44100 /*SampleFreq*/ );
        p_sys->waveheader.DataChunkID = VLC_FOURCC('d', 'a', 't', 'a');
        p_sys->waveheader.DataLength = 0;           /* we just don't know */

        p_sys->i_first_sector = var_CreateGetInteger( p_access,
                                                      "cdda-first-sector" );
        p_sys->i_last_sector  = var_CreateGetInteger( p_access,
                                                      "cdda-last-sector" );
        /* Tracknumber in MRL */
        if( p_sys->i_first_sector < 0 || p_sys->i_last_sector < 0 )
        {
            int i_titles;
            if( i_mrl_tracknum <= 0 )
            {
                msg_Err( p_access, "wrong sector information" );
                goto error;
            }
            i_titles = ioctl_GetTracksMap( VLC_OBJECT(p_access),
                                            p_sys->vcddev, &p_sys->p_sectors );
        }


        p_sys->i_sector = p_sys->i_first_sector;
        p_access->info.i_size = (p_sys->i_last_sector - p_sys->i_first_sector)
                                     * (int64_t)CDDA_DATA_SIZE;
    }

    /* PTS delay */
    var_Create( p_access, "cdda-caching", VLC_VAR_INTEGER|VLC_VAR_DOINHERIT );

    return VLC_SUCCESS;

error:
    ioctl_Close( VLC_OBJECT(p_access), p_sys->vcddev );
    free( p_sys );
    return VLC_EGENERIC;
}

/*****************************************************************************
 * Close: closes cdda
 *****************************************************************************/
static void Close( vlc_object_t *p_this )
{
    access_t     *p_access = (access_t *)p_this;
    access_sys_t *p_sys = p_access->p_sys;
    ioctl_Close( p_this, p_sys->vcddev );
    free( p_sys );
}

/*****************************************************************************
 * Block: read data (CDDA_DATA_ONCE)
 *****************************************************************************/
static block_t *Block( access_t *p_access )
{
    access_sys_t *p_sys = p_access->p_sys;
    int i_blocks = CDDA_BLOCKS_ONCE;
    block_t *p_block;

    if( p_sys->i_track < 0 ) p_access->info.b_eof = true;

    /* Check end of file */
    if( p_access->info.b_eof ) return NULL;