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vlc/modules/demux/voc.c

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/*****************************************************************************
* voc.c : Creative Voice File (.VOC) demux module for vlc
*****************************************************************************
* Copyright (C) 2005 Rémi Denis-Courmont
*
* Authors: Rémi Denis-Courmont
*
* 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 <assert.h>
#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_demux.h>
/*****************************************************************************
* Module descriptor
*****************************************************************************/
static int Open ( vlc_object_t * );
vlc_module_begin ()
set_description( N_("VOC demuxer") )
set_category( CAT_INPUT )
set_subcategory( SUBCAT_INPUT_DEMUX )
set_capability( "demux", 10 )
set_callback( Open )
vlc_module_end ()
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static int Demux ( demux_t * );
static int Control( demux_t *, int i_query, va_list args );
typedef struct
{
es_format_t fmt;
es_out_id_t *p_es;
int64_t i_block_start;
int64_t i_block_end;
int64_t i_loop_offset;
unsigned i_loop_count;
unsigned i_silence_countdown;
date_t pts;
} demux_sys_t;
static const char ct_header[] = "Creative Voice File\x1a";
/*****************************************************************************
* Open: check file and initializes structures
*****************************************************************************/
static int Open( vlc_object_t * p_this )
{
demux_t *p_demux = (demux_t*)p_this;
const uint8_t *p_buf;
uint16_t i_data_offset, i_version;
if( vlc_stream_Peek( p_demux->s, &p_buf, 26 ) < 26 )
return VLC_EGENERIC;
if( memcmp( p_buf, ct_header, 20 ) )
return VLC_EGENERIC;
p_buf += 20;
i_data_offset = GetWLE( p_buf );
if ( i_data_offset < 26 /* not enough room for full VOC header */ )
return VLC_EGENERIC;
p_buf += 2;
i_version = GetWLE( p_buf );
if( ( i_version != 0x10A ) && ( i_version != 0x114 ) )
return VLC_EGENERIC; /* unknown VOC version */
p_buf += 2;
if( GetWLE( p_buf ) != (uint16_t)(0x1234 + ~i_version) )
return VLC_EGENERIC;
/* We have a valid VOC header */
msg_Dbg( p_demux, "CT Voice file v%d.%d", i_version >> 8,
i_version & 0xff );
/* skip VOC header */
if( vlc_stream_Read( p_demux->s, NULL, i_data_offset ) < i_data_offset )
return VLC_EGENERIC;
demux_sys_t *p_sys = vlc_obj_malloc( p_this, sizeof (*p_sys) );
if( unlikely(p_sys == NULL) )
return VLC_ENOMEM;
p_sys->i_silence_countdown = p_sys->i_block_start = p_sys->i_block_end =
p_sys->i_loop_count = 0;
p_sys->p_es = NULL;
date_Init( &p_sys->pts, 1, 1 );
date_Set( &p_sys->pts, VLC_TICK_0 );
es_format_Init( &p_sys->fmt, AUDIO_ES, 0 );
p_demux->pf_demux = Demux;
p_demux->pf_control = Control;
p_demux->p_sys = p_sys;
return VLC_SUCCESS;
}
static int fmtcmp( es_format_t *ofmt, es_format_t *nfmt )
{
return (ofmt->audio.i_bitspersample != nfmt->audio.i_bitspersample)
|| (ofmt->audio.i_rate != nfmt->audio.i_rate)
|| (ofmt->audio.i_channels != nfmt->audio.i_channels);
}
/*
* Converts old-style VOC sample rates to commonly used ones
* so as not to confuse sound card drivers.
* (I assume 16k, 24k and 32k are never found in .VOC files)
*/
static unsigned int fix_voc_sr( unsigned int sr )
{
switch( sr )
{
/*case 8000:
return 8000;*/
case 11111:
return 11025;
case 22222:
return 22050;
case 44444:
return 44100;
}
return sr;
}
static int ReadBlockHeader( demux_t *p_demux )
{
es_format_t new_fmt;
uint8_t buf[8];
int32_t i_block_size;
demux_sys_t *p_sys = p_demux->p_sys;
if( vlc_stream_Read( p_demux->s, buf, 4 ) < 4 )
return VLC_EGENERIC; /* EOF */
i_block_size = GetDWLE( buf ) >> 8;
msg_Dbg( p_demux, "new block: type: %u, size: %u",
(unsigned)*buf, i_block_size );
es_format_Init( &new_fmt, AUDIO_ES, 0 );
switch( *buf )
{
case 0: /* not possible : caught with earlier vlc_stream_Read */
goto corrupt;
case 1:
if( i_block_size < 2 )
goto corrupt;
i_block_size -= 2;
if( vlc_stream_Read( p_demux->s, buf, 2 ) < 2 )
goto corrupt;
switch( buf[1] ) /* codec id */
{
case 0x0:
new_fmt.i_codec = VLC_CODEC_U8;
new_fmt.audio.i_bytes_per_frame = 1;
new_fmt.audio.i_bitspersample = 8;
break;
case 0x1:
new_fmt.i_codec = VLC_CODEC_ADPCM_SBPRO_4;
new_fmt.audio.i_bytes_per_frame = 1;
new_fmt.audio.i_bitspersample = 4;
break;
case 0x2:
new_fmt.i_codec = VLC_CODEC_ADPCM_SBPRO_3;
new_fmt.audio.i_bytes_per_frame = 3;
new_fmt.audio.i_bitspersample = 3;
break;
case 0x3:
new_fmt.i_codec = VLC_CODEC_ADPCM_SBPRO_2;
new_fmt.audio.i_bytes_per_frame = 1;
new_fmt.audio.i_bitspersample = 2;
break;
case 0x4:
new_fmt.i_codec = VLC_CODEC_S16L;
new_fmt.audio.i_bytes_per_frame = 2;
new_fmt.audio.i_bitspersample = 16;
break;
case 0x6:
new_fmt.i_codec = VLC_CODEC_ALAW;
new_fmt.audio.i_bytes_per_frame = 1;
new_fmt.audio.i_bitspersample = 8;
break;
case 0x7:
new_fmt.i_codec = VLC_CODEC_MULAW;
new_fmt.audio.i_bytes_per_frame = 1;
new_fmt.audio.i_bitspersample = 8;
break;
default:
msg_Err( p_demux, "unsupported compression 0x%"PRIx8, buf[1] );
return VLC_EGENERIC;
}
new_fmt.audio.i_channels = 1;
new_fmt.audio.i_bytes_per_frame *= new_fmt.audio.i_channels;
new_fmt.audio.i_blockalign = new_fmt.audio.i_bytes_per_frame;
new_fmt.audio.i_frame_length = new_fmt.audio.i_bytes_per_frame * 8
/ new_fmt.audio.i_bitspersample;
new_fmt.audio.i_rate = fix_voc_sr( 1000000L / (256L - buf[0]) );
new_fmt.i_bitrate = new_fmt.audio.i_rate * new_fmt.audio.i_bitspersample
* new_fmt.audio.i_channels;
break;
case 2: /* data block with same format as the previous one */
if( p_sys->p_es == NULL )
goto corrupt; /* no previous block! */
memcpy( &new_fmt, &p_sys->fmt, sizeof( new_fmt ) );
break;
case 3: /* silence block */
if( ( i_block_size != 3 )
|| ( vlc_stream_Read( p_demux->s, buf, 3 ) < 3 ) )
goto corrupt;
i_block_size = 0;
p_sys->i_silence_countdown = GetWLE( buf );
new_fmt.i_codec = VLC_CODEC_U8;
new_fmt.audio.i_rate = fix_voc_sr( 1000000L / (256L - buf[0]) );
new_fmt.audio.i_bytes_per_frame = 1;
new_fmt.audio.i_frame_length = 1;
new_fmt.audio.i_channels = 1;
new_fmt.audio.i_blockalign = 1;
new_fmt.audio.i_bitspersample = 8;
new_fmt.i_bitrate = new_fmt.audio.i_rate * 8;
break;
case 6: /* repeat block */
if( ( i_block_size != 2 )
|| ( vlc_stream_Read( p_demux->s, buf, 2 ) < 2 ) )
goto corrupt;
i_block_size = 0;
p_sys->i_loop_count = GetWLE( buf );
p_sys->i_loop_offset = vlc_stream_Tell( p_demux->s );
break;
case 7: /* repeat end block */
if( i_block_size != 0 )
goto corrupt;
if( p_sys->i_loop_count > 0 )
{
if( vlc_stream_Seek( p_demux->s, p_sys->i_loop_offset ) )
msg_Warn( p_demux, "cannot loop: seek failed" );
else
p_sys->i_loop_count--;
}
break;
case 8:
/*
* Block 8 is a big kludge to add stereo support to block 1 :
* A block of type 8 is always followed by a block of type 1
* and specifies the number of channels in that 1-block
* (normally block 1 are always mono). In practice, block type 9
* is used for stereo rather than 8
*/
if( ( i_block_size != 4 )
|| ( vlc_stream_Read( p_demux->s, buf, 4 ) < 4 ) )
goto corrupt;
if( buf[2] )
{
msg_Err( p_demux, "unsupported compression" );
return VLC_EGENERIC;
}
new_fmt.i_codec = VLC_CODEC_U8;
if (buf[3] >= 32)
goto corrupt;
new_fmt.audio.i_channels = buf[3] + 1; /* can't be nul */
new_fmt.audio.i_rate = 256000000L /
((65536L - GetWLE(buf)) * new_fmt.audio.i_channels);
new_fmt.audio.i_bytes_per_frame = new_fmt.audio.i_channels;
new_fmt.audio.i_frame_length = 1;
new_fmt.audio.i_blockalign = new_fmt.audio.i_bytes_per_frame;
new_fmt.audio.i_bitspersample = 8 * new_fmt.audio.i_bytes_per_frame;
new_fmt.i_bitrate = new_fmt.audio.i_rate * 8;
/* read subsequent block 1 */
if( vlc_stream_Read( p_demux->s, buf, 4 ) < 4 )
return VLC_EGENERIC; /* EOF */
i_block_size = GetDWLE( buf ) >> 8;
msg_Dbg( p_demux, "new block: type: %u, size: %u",
(unsigned)*buf, i_block_size );
if( i_block_size < 2 )
goto corrupt;
i_block_size -= 2;
if( vlc_stream_Read( p_demux->s, buf, 2 ) < 2 )
goto corrupt;
if( buf[1] )
{
msg_Err( p_demux, "unsupported compression" );
return VLC_EGENERIC;
}
break;
case 9: /* newer data block with channel number and bits resolution */
if( i_block_size < 12 )
goto corrupt;
i_block_size -= 12;
if( ( vlc_stream_Read( p_demux->s, buf, 8 ) < 8 )
|| ( vlc_stream_Read( p_demux->s, NULL, 4 ) < 4 ) )
goto corrupt;
new_fmt.audio.i_rate = GetDWLE( buf );
if( !new_fmt.audio.i_rate )
goto corrupt;
new_fmt.audio.i_bitspersample = buf[4];
new_fmt.audio.i_channels = buf[5];
switch( GetWLE( &buf[6] ) ) /* format */
{
case 0x0000: /* PCM */
switch( new_fmt.audio.i_bitspersample )
{
case 8:
new_fmt.i_codec = VLC_CODEC_U8;
break;
case 16:
new_fmt.i_codec = VLC_CODEC_U16L;
break;
default:
msg_Err( p_demux, "unsupported bit res.: %u bits",
new_fmt.audio.i_bitspersample );
return VLC_EGENERIC;
}
break;
case 0x0004: /* signed */
switch( new_fmt.audio.i_bitspersample )
{
case 8:
new_fmt.i_codec = VLC_CODEC_S8;
break;
case 16:
new_fmt.i_codec = VLC_CODEC_S16L;
break;
default:
msg_Err( p_demux, "unsupported bit res.: %u bits",
new_fmt.audio.i_bitspersample );
return VLC_EGENERIC;
}
break;
default:
msg_Err( p_demux, "unsupported compression" );
return VLC_EGENERIC;
}
if( new_fmt.audio.i_channels == 0 )
{
msg_Err( p_demux, "0 channels detected" );
return VLC_EGENERIC;
}
new_fmt.audio.i_bytes_per_frame = new_fmt.audio.i_channels
* (new_fmt.audio.i_bitspersample / 8);
new_fmt.audio.i_frame_length = 1;
new_fmt.audio.i_blockalign = new_fmt.audio.i_bytes_per_frame;
new_fmt.i_bitrate = 8 * new_fmt.audio.i_rate
* new_fmt.audio.i_bytes_per_frame;
break;
default:
msg_Dbg( p_demux, "unknown block type %u - skipping block",
(unsigned)*buf);
/* fall through */
case 4: /* blocks of non-audio types can be skipped */
case 5:
if( vlc_stream_Read( p_demux->s, NULL,
i_block_size ) < i_block_size )
goto corrupt;
i_block_size = 0;
break;
}
p_sys->i_block_start = vlc_stream_Tell( p_demux->s );
p_sys->i_block_end = p_sys->i_block_start + i_block_size;
if( i_block_size || p_sys->i_silence_countdown )
{
/* we've read a block with data in it - update decoder */
msg_Dbg( p_demux, "fourcc: %4.4s, channels: %d, "
"freq: %d Hz, bitrate: %dKo/s, blockalign: %d, "
"bits/samples: %d", (char *)&new_fmt.i_codec,
new_fmt.audio.i_channels, new_fmt.audio.i_rate,
new_fmt.i_bitrate / 8192, new_fmt.audio.i_blockalign,
new_fmt.audio.i_bitspersample );
if( ( p_sys->p_es != NULL ) && fmtcmp( &p_sys->fmt, &new_fmt ) )
{
msg_Dbg( p_demux, "codec change needed" );
es_out_Del( p_demux->out, p_sys->p_es );
p_sys->p_es = NULL;
}
if( p_sys->p_es == NULL )
{
memcpy( &p_sys->fmt, &new_fmt, sizeof( p_sys->fmt ) );
date_Change( &p_sys->pts, p_sys->fmt.audio.i_rate, 1 );
p_sys->p_es = es_out_Add( p_demux->out, &p_sys->fmt );
if( unlikely(p_sys->p_es == NULL) )
return VLC_ENOMEM;
}
}
return VLC_SUCCESS;
corrupt:
msg_Err( p_demux, "corrupted file - halting demux" );
return VLC_EGENERIC;
}
/*****************************************************************************
* Demux: read packet and send them to decoders
*****************************************************************************
* Returns -1 in case of error, 0 in case of EOF, 1 otherwise
*****************************************************************************/
#define MAX_READ_FRAME 1000
static int Demux( demux_t *p_demux )
{
demux_sys_t *p_sys = p_demux->p_sys;
block_t *p_block;
int64_t i_read_frames;
if( p_sys->i_silence_countdown == 0 )
{
int64_t i_offset = vlc_stream_Tell( p_demux->s );
if( i_offset >= p_sys->i_block_end )
{
if( ReadBlockHeader( p_demux ) != VLC_SUCCESS )
return VLC_DEMUXER_EOF;
return VLC_DEMUXER_SUCCESS;
}
i_read_frames = ( p_sys->i_block_end - i_offset )
/ p_sys->fmt.audio.i_bytes_per_frame;
if( i_read_frames > MAX_READ_FRAME )
i_read_frames = MAX_READ_FRAME;
p_block = vlc_stream_Block( p_demux->s,
p_sys->fmt.audio.i_bytes_per_frame
* i_read_frames );
if( p_block == NULL )
{
msg_Warn( p_demux, "cannot read data" );
return VLC_DEMUXER_EOF;
}
}
else
{ /* emulates silence from the stream */
i_read_frames = p_sys->i_silence_countdown;
if( i_read_frames > MAX_READ_FRAME )
i_read_frames = MAX_READ_FRAME;
p_block = block_Alloc( i_read_frames );
if( p_block == NULL )
return VLC_ENOMEM;
memset( p_block->p_buffer, 0, i_read_frames );
p_sys->i_silence_countdown -= i_read_frames;
}
p_block->i_dts = p_block->i_pts = VLC_TICK_0 + date_Get( &p_sys->pts );
p_block->i_nb_samples = i_read_frames * p_sys->fmt.audio.i_frame_length;
date_Increment( &p_sys->pts, p_block->i_nb_samples );
es_out_SetPCR( p_demux->out, p_block->i_pts );
assert(p_sys->p_es != NULL);
es_out_Send( p_demux->out, p_sys->p_es, p_block );
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;
return demux_vaControlHelper( p_demux->s, p_sys->i_block_start,
p_sys->i_block_end,
p_sys->fmt.i_bitrate,
p_sys->fmt.audio.i_blockalign,
i_query, args );
}
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