access.c

vlc源码

/*****************************************************************************
 * access.c : CD digital audio input module for vlc using libcdio
 *****************************************************************************
 * Copyright (C) 2000, 2003, 2004, 2005 the VideoLAN team
 * $Id$
 *
 * Authors: Rocky Bernstein <[e-mail]>
 *          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.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include "callback.h"      /* FIXME - reorganize callback.h, cdda.h better */
#include "cdda.h"          /* private structures. Also #includes vlc things */
#include "info.h"          /* headers for meta info retrieval */
#include "access.h"
#include "vlc_keys.h"
#include <vlc_interface.h>

#include <cdio/cdio.h>
#include <cdio/logging.h>
#include <cdio/cd_types.h>


/* #ifdef variables below are defined via config.h via #include vlc above. */

#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif

#ifdef HAVE_UNISTD_H
#   include <unistd.h>
#endif

/* FIXME: This variable is a hack. Would be nice to eliminate. */
access_t *p_cdda_input = NULL;

/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
static ssize_t  CDDARead( access_t *, uint8_t *, size_t );
static block_t *CDDAReadBlocks( access_t * p_access );
static int      CDDASeek( access_t * p_access, int64_t i_pos );
static int      CDDAControl( access_t *p_access, int i_query,
                             va_list args );

static int      CDDAInit( access_t *p_access, cdda_data_t *p_cdda ) ;


/****************************************************************************
 * Private functions
 ****************************************************************************/

/* process messages that originate from libcdio.
   called by CDDAOpen
*/
static void
cdio_log_handler( cdio_log_level_t level, const char message[] )
{
    cdda_data_t *p_cdda = (cdda_data_t *)p_cdda_input->p_sys;

    if( p_cdda == NULL )
        return;

    switch( level )
    {
        case CDIO_LOG_DEBUG:
        case CDIO_LOG_INFO:
            if (p_cdda->i_debug & INPUT_DBG_CDIO)
            msg_Dbg( p_cdda_input, "%s", message);
            break;
        case CDIO_LOG_WARN:
            msg_Warn( p_cdda_input, "%s", message);
            break;
        case CDIO_LOG_ERROR:
        case CDIO_LOG_ASSERT:
            msg_Err( p_cdda_input, "%s", message);
            break;
        default:
            msg_Warn( p_cdda_input, "%s\n%s %d", message,
                    "the above message had unknown cdio log level",
                    level);
            break;
    }
}

#ifdef HAVE_LIBCDDB
/*! This routine is called by libcddb routines on error.
   called by CDDAOpen
*/
static void
cddb_log_handler( cddb_log_level_t level, const char message[] )
{
    cdda_data_t *p_cdda = (cdda_data_t *)p_cdda_input->p_sys;
    switch( level )
    {
        case CDDB_LOG_DEBUG:
        case CDDB_LOG_INFO:
            if( !(p_cdda->i_debug & INPUT_DBG_CDDB) )
                return;
        /* Fall through if to warn case */
        default:
            cdio_log_handler( level, message );
            break;
    }
}
#endif /*HAVE_LIBCDDB*/


/*! This routine is when vlc is not fully set up (before full initialization)
  or is not around (before finalization).
*/
static void
uninit_log_handler( cdio_log_level_t level, const char message[] )
{
    cdda_data_t *p_cdda = NULL;

    if( p_cdda_input )
        p_cdda = (cdda_data_t *)p_cdda_input->p_sys;

     switch( level )
     {
        case CDIO_LOG_DEBUG:
        case CDIO_LOG_INFO:
            if( !p_cdda || !(p_cdda->i_debug & (INPUT_DBG_CDIO|INPUT_DBG_CDDB)) )
                return;
        /* Fall through if to warn case */
        case CDIO_LOG_WARN:
            fprintf( stderr, "WARN: %s\n", message );
            break;
        case CDIO_LOG_ERROR:
            fprintf( stderr, "ERROR: %s\n", message );
            break;
        case CDIO_LOG_ASSERT:
            fprintf( stderr, "ASSERT ERROR: %s\n", message );
            break;
        default:
            fprintf( stderr, "UNKNOWN ERROR: %s\n%s %d\n", message,
                            "The above message had unknown cdio log level",
                            level );
        break;
    }
    /* gl_default_cdio_log_handler (level, message); */
}

/* Only used in audio control mode. Gets the current LSN from the
   CD-ROM drive. */
static int64_t get_audio_position ( access_t *p_access )
{
    cdda_data_t *p_cdda   = (cdda_data_t *) p_access->p_sys;
    lsn_t i_offset;

#if LIBCDIO_VERSION_NUM >= 73
    if( p_cdda->b_audio_ctl )
    {
        cdio_subchannel_t sub;
        CdIo_t *p_cdio = p_cdda->p_cdio;

        if( DRIVER_OP_SUCCESS == cdio_audio_read_subchannel(p_cdio, &sub) )
        {
            if( (sub.audio_status != CDIO_MMC_READ_SUB_ST_PAUSED) &&
                (sub.audio_status != CDIO_MMC_READ_SUB_ST_PLAY) )
                return CDIO_INVALID_LSN;

            if( ! p_cdda->b_nav_mode )
            {
                i_offset = cdio_msf_to_lba( (&sub.abs_addr) );
            }
            else
            {
                i_offset = cdio_msf_to_lba( (&sub.rel_addr) );
            }
        }
        else
        {
            i_offset = p_cdda->i_lsn;
        }
    }
    else
    {
        i_offset = p_cdda->i_lsn;
    }
#else
        i_offset = p_cdda->i_lsn;
#endif
    return i_offset;
}

/*****************************************************************************
 * CDDAReadBlocks: reads a group of blocks from the CD-DA and returns
 * an allocated pointer to the data. NULL is returned if no data
 * read. It is also possible if we haven't read a RIFF header in which
 * case one that we creaded during Open/Initialization is returned.
 *****************************************************************************/
static block_t * CDDAReadBlocks( access_t * p_access )
{
    block_t     *p_block;
    cdda_data_t *p_cdda   = (cdda_data_t *) p_access->p_sys;
    int          i_blocks = p_cdda->i_blocks_per_read;

    dbg_print( (INPUT_DBG_CALL|INPUT_DBG_EXT|INPUT_DBG_LSN),
                "called i_lsn: %d i_pos: %lld, size: %lld",
                p_cdda->i_lsn, p_access->info.i_pos, p_access->info.i_size );

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

    if( !p_cdda->b_header )
      {
        /* Return only the dummy RIFF header we created in Open/Init */
        p_block = block_New( p_access, sizeof( WAVEHEADER ) );
        memcpy( p_block->p_buffer, &p_cdda->waveheader, sizeof(WAVEHEADER) );
        p_cdda->b_header = true;
        return p_block;
    }

    /* Check end of track */
    while( p_cdda->i_lsn > cdio_get_track_last_lsn(p_cdda->p_cdio,
           p_cdda->i_track) )
    {
        bool go_on;

        if( p_cdda->b_nav_mode )
            go_on = p_cdda->i_lsn > p_cdda->last_disc_frame;
        else
            go_on = p_cdda->i_track >= p_cdda->i_first_track+p_cdda->i_titles-1 ;

        if( go_on )
        {
            dbg_print( (INPUT_DBG_LSN), "EOF");
                        p_access->info.b_eof = true;
            return NULL;
        }

        p_access->info.i_update |= INPUT_UPDATE_TITLE | INPUT_UPDATE_META;
        p_access->info.i_title++;
        p_cdda->i_track++;

        if( p_cdda-> b_nav_mode )
        {
            char *psz_title = CDDAFormatTitle( p_access, p_cdda->i_track );
            input_Control( p_cdda->p_input, INPUT_SET_NAME, psz_title );
            free(psz_title);
        }
        else
        {
            p_access->info.i_size =
                    p_cdda->p_title[p_access->info.i_title]->i_size;
            p_access->info.i_pos = 0;
            p_access->info.i_update |= INPUT_UPDATE_SIZE;
        }
    }

    /* Possibly adjust i_blocks so we don't read past the end of a track. */
    if( p_cdda->i_lsn + i_blocks >=
        cdio_get_track_lsn(p_cdda->p_cdio, p_cdda->i_track+1) )
    {
        i_blocks = cdio_get_track_lsn( p_cdda->p_cdio, p_cdda->i_track+1 )
                    - p_cdda->i_lsn;
    }

    /* Do the actual reading */
    p_block = block_New( p_access, i_blocks * CDIO_CD_FRAMESIZE_RAW );
    if( !p_block)
    {
        msg_Err( p_access, "cannot get a new block of size: %i",
                i_blocks * CDIO_CD_FRAMESIZE_RAW );
        intf_UserFatal( p_access, false, _("CD reading failed"),
                        _("VLC could not get a new block of size: %i."),
                        i_blocks * CDIO_CD_FRAMESIZE_RAW );
        return NULL;
    }

    {
#if LIBCDIO_VERSION_NUM >= 72
        driver_return_code_t rc = DRIVER_OP_SUCCESS;

        if( p_cdda->e_paranoia && p_cdda->paranoia )
        {
            int i;
            for( i = 0; i < i_blocks; i++ )
            {
                int16_t *p_readbuf = cdio_paranoia_read( p_cdda->paranoia, NULL );
                char *psz_err = cdio_cddap_errors( p_cdda->paranoia_cd );
                char *psz_mes = cdio_cddap_messages( p_cdda->paranoia_cd );

                if( psz_mes || psz_err )
                    msg_Err( p_access, "%s%s\n", psz_mes ? psz_mes: "",
                             psz_err ? psz_err: "" );

                free( psz_err );
                free( psz_mes );
                if( !p_readbuf )
                {
                    msg_Err( p_access, "paranoia read error on frame %i\n",
                    p_cdda->i_lsn+i );
                }
                else
                    memcpy( p_block->p_buffer + i * CDIO_CD_FRAMESIZE_RAW,
                            p_readbuf, CDIO_CD_FRAMESIZE_RAW );
            }
        }
        else
        {
            rc = cdio_read_audio_sectors( p_cdda->p_cdio, p_block->p_buffer,
                                          p_cdda->i_lsn, i_blocks );
#else
#define DRIVER_OP_SUCCESS 0
            int rc;
            rc = cdio_read_audio_sectors( p_cdda->p_cdio, p_block->p_buffer,
                                          p_cdda->i_lsn, i_blocks);
#endif
        }
        if( rc != DRIVER_OP_SUCCESS )
        {
            msg_Err( p_access, "could not read %d sectors starting from %lu",
                     i_blocks, (long unsigned int) p_cdda->i_lsn );
            block_Release( p_block );

            /* If we had problems above, assume the problem is with
                the first sector of the read and set to skip it.  In
                the future libcdio may have cdparanoia support.
            */
            p_cdda->i_lsn++;
            p_access->info.i_pos += CDIO_CD_FRAMESIZE_RAW;
            return NULL;
        }
    }

    p_cdda->i_lsn        += i_blocks;
    p_access->info.i_pos += i_blocks * CDIO_CD_FRAMESIZE_RAW;

    return p_block;
}

/*****************************************************************************
 * CDDARead: Handler for audio control reads the CD-DA.
 *****************************************************************************/
static ssize_t
CDDARead( access_t * p_access, uint8_t *p_buffer, size_t i_len )
{
    cdda_data_t *p_cdda   = (cdda_data_t *) p_access->p_sys;

    dbg_print( (INPUT_DBG_CALL|INPUT_DBG_EXT|INPUT_DBG_LSN),
               "called lsn: %d pos: %lld, size: %lld",
                p_cdda->i_lsn, p_access->info.i_pos, p_access->info.i_size);

    /* Check end of file */
    if( p_access->info.b_eof )
        return 0;