wav.c

VLC Player Source Code

/*****************************************************************************
 * wav.c : wav file input module for vlc
 *****************************************************************************
 * Copyright (C) 2001-2008 the VideoLAN team
 * $Id: 3a4fcfefa56f0e8b74195b9ea7a045bcbae36cdf $
 *
 * Authors: Laurent Aimar <[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
 *****************************************************************************/

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

#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_demux.h>
#include <vlc_aout.h>
#include <vlc_codecs.h>

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

vlc_module_begin();
    set_description( N_("WAV demuxer") );
    set_category( CAT_INPUT );
    set_subcategory( SUBCAT_INPUT_DEMUX );
    set_capability( "demux", 142 );
    set_callbacks( Open, Close );
vlc_module_end();

/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
static int Demux  ( demux_t * );
static int Control( demux_t *, int i_query, va_list args );

struct demux_sys_t
{
    es_format_t     fmt;
    es_out_id_t     *p_es;

    int64_t         i_data_pos;
    unsigned int    i_data_size;

    unsigned int    i_frame_size;
    int             i_frame_samples;

    date_t          pts;

    uint32_t i_channel_mask;
    bool b_chan_reorder;              /* do we need channel reordering */
    int pi_chan_table[AOUT_CHAN_MAX];
};

#define __EVEN( x ) (((x) + 1) & ~1)

static int ChunkFind( demux_t *, const char *, unsigned int * );

static void FrameInfo_IMA_ADPCM( demux_t *, unsigned int *, int * );
static void FrameInfo_MS_ADPCM ( demux_t *, unsigned int *, int * );
static void FrameInfo_PCM      ( demux_t *, unsigned int *, int * );

static const uint32_t pi_channels_src[] =
    { WAVE_SPEAKER_FRONT_LEFT, WAVE_SPEAKER_FRONT_RIGHT,
      WAVE_SPEAKER_FRONT_CENTER, WAVE_SPEAKER_LOW_FREQUENCY,
      WAVE_SPEAKER_BACK_LEFT, WAVE_SPEAKER_BACK_RIGHT, WAVE_SPEAKER_BACK_CENTER,
      WAVE_SPEAKER_SIDE_LEFT, WAVE_SPEAKER_SIDE_RIGHT, 0 };
static const uint32_t pi_channels_in[] =
    { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
      AOUT_CHAN_CENTER, AOUT_CHAN_LFE,
      AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, AOUT_CHAN_REARCENTER,
      AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT, 0 };

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

    const uint8_t *p_peek;
    uint32_t     i_size;
    unsigned int i_extended;
    const char        *psz_name;

    WAVEFORMATEXTENSIBLE *p_wf_ext = NULL;
    WAVEFORMATEX         *p_wf = NULL;

    /* Is it a wav file ? */
    if( stream_Peek( p_demux->s, &p_peek, 12 ) < 12 ) return VLC_EGENERIC;

    if( memcmp( p_peek, "RIFF", 4 ) || memcmp( &p_peek[8], "WAVE", 4 ) )
    {
        return VLC_EGENERIC;
    }

    p_demux->pf_demux   = Demux;
    p_demux->pf_control = Control;
    p_demux->p_sys      = p_sys = malloc( sizeof( demux_sys_t ) );
    if( p_sys == NULL )
        return VLC_ENOMEM;

    p_sys->p_es         = NULL;
    p_sys->b_chan_reorder = 0;
    p_sys->i_channel_mask = 0;

    /* skip riff header */
    stream_Read( p_demux->s, NULL, 12 );  /* cannot fail as peek succeed */

    /* search fmt chunk */
    if( ChunkFind( p_demux, "fmt ", &i_size ) )
    {
        msg_Err( p_demux, "cannot find 'fmt ' chunk" );
        goto error;
    }
    i_size += 2;
    if( i_size < sizeof( WAVEFORMATEX ) )
    {
        msg_Err( p_demux, "invalid 'fmt ' chunk" );
        goto error;
    }
    stream_Read( p_demux->s, NULL, 8 );   /* Cannot fail */

    /* load waveformatex */
    p_wf_ext = malloc( i_size );
    if( p_wf_ext == NULL )
         goto error;

    p_wf = (WAVEFORMATEX *)p_wf_ext;
    p_wf->cbSize = 0;
    i_size -= 2;
    if( stream_Read( p_demux->s, p_wf, i_size ) != (int)i_size
     || ( ( i_size & 1 ) && stream_Read( p_demux->s, NULL, 1 ) != 1 ) )
    {
        msg_Err( p_demux, "cannot load 'fmt ' chunk" );
        goto error;
    }

    es_format_Init( &p_sys->fmt, AUDIO_ES, 0 );
    wf_tag_to_fourcc( GetWLE( &p_wf->wFormatTag ), &p_sys->fmt.i_codec,
                      &psz_name );
    p_sys->fmt.audio.i_channels = GetWLE ( &p_wf->nChannels );
    p_sys->fmt.audio.i_rate = GetDWLE( &p_wf->nSamplesPerSec );
    p_sys->fmt.audio.i_blockalign = GetWLE( &p_wf->nBlockAlign );
    p_sys->fmt.i_bitrate = GetDWLE( &p_wf->nAvgBytesPerSec ) * 8;
    p_sys->fmt.audio.i_bitspersample = GetWLE( &p_wf->wBitsPerSample );
    if( i_size >= sizeof(WAVEFORMATEX) )
        p_sys->fmt.i_extra = __MIN( GetWLE( &p_wf->cbSize ), i_size - sizeof(WAVEFORMATEX) );
    i_extended = 0;

    /* Handle new WAVE_FORMAT_EXTENSIBLE wav files */
    /* see the following link for more information:
     * http://www.microsoft.com/whdc/device/audio/multichaud.mspx#EFAA */
    if( GetWLE( &p_wf->wFormatTag ) == WAVE_FORMAT_EXTENSIBLE &&
        i_size >= sizeof( WAVEFORMATEXTENSIBLE ) &&
        ( p_sys->fmt.i_extra + sizeof( WAVEFORMATEX )
            >= sizeof( WAVEFORMATEXTENSIBLE ) ) )
    {
        unsigned i, i_channel_mask;
        GUID guid_subformat;

        guid_subformat = p_wf_ext->SubFormat;
        guid_subformat.Data1 = GetDWLE( &p_wf_ext->SubFormat.Data1 );
        guid_subformat.Data2 = GetWLE( &p_wf_ext->SubFormat.Data2 );
        guid_subformat.Data3 = GetWLE( &p_wf_ext->SubFormat.Data3 );

        sf_tag_to_fourcc( &guid_subformat, &p_sys->fmt.i_codec, &psz_name );

        i_extended = sizeof( WAVEFORMATEXTENSIBLE ) - sizeof( WAVEFORMATEX );
        p_sys->fmt.i_extra -= i_extended;

        i_channel_mask = GetDWLE( &p_wf_ext->dwChannelMask );
        if( i_channel_mask )
        {
            for( i = 0; i < sizeof(pi_channels_src)/sizeof(uint32_t); i++ )
            {
                if( i_channel_mask & pi_channels_src[i] )
                    p_sys->i_channel_mask |= pi_channels_in[i];
            }

            if( p_sys->fmt.i_codec == VLC_FOURCC('a','r','a','w') ||
                p_sys->fmt.i_codec == VLC_FOURCC('p','c','m',' ') ||
                p_sys->fmt.i_codec == VLC_FOURCC('a','f','l','t') )

            p_sys->b_chan_reorder =
                aout_CheckChannelReorder( pi_channels_in, NULL,
                                          p_sys->i_channel_mask,
                                          p_sys->fmt.audio.i_channels,
                                          p_sys->pi_chan_table );

            msg_Dbg( p_demux, "channel mask: %x, reordering: %i",
                     p_sys->i_channel_mask, (int)p_sys->b_chan_reorder );
        }
        p_sys->fmt.audio.i_physical_channels =
            p_sys->fmt.audio.i_original_channels =
                p_sys->i_channel_mask;
    }

    if( p_sys->fmt.i_extra > 0 )
    {
        p_sys->fmt.p_extra = malloc( p_sys->fmt.i_extra );
        memcpy( p_sys->fmt.p_extra, ((uint8_t *)p_wf) + i_extended,
                p_sys->fmt.i_extra );
    }

    msg_Dbg( p_demux, "format: 0x%4.4x, fourcc: %4.4s, channels: %d, "
             "freq: %u Hz, bitrate: %uKo/s, blockalign: %d, bits/samples: %d, "
             "extra size: %d",