mirror of
https://code.videolan.org/videolan/vlc
synced 2024-09-16 16:02:54 +02:00
336 lines
9.9 KiB
C
336 lines
9.9 KiB
C
/*****************************************************************************
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* aiff.c: Audio Interchange File Format demuxer
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*****************************************************************************
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* Copyright (C) 2004-2007 the VideoLAN team
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* $Id$
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*
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* Authors: Laurent Aimar <fenrir@via.ecp.fr>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <vlc/vlc.h>
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#include <vlc_plugin.h>
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#include <vlc_demux.h>
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/* TODO:
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* - ...
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*/
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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static int Open ( vlc_object_t * );
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static void Close ( vlc_object_t * );
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vlc_module_begin();
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set_category( CAT_INPUT );
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set_subcategory( SUBCAT_INPUT_DEMUX );
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set_description( _("AIFF demuxer" ) );
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set_capability( "demux", 10 );
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set_callbacks( Open, Close );
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add_shortcut( "aiff" );
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vlc_module_end();
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/*****************************************************************************
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* Local prototypes
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*****************************************************************************/
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struct demux_sys_t
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{
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es_format_t fmt;
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es_out_id_t *es;
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int64_t i_ssnd_pos;
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int64_t i_ssnd_size;
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int i_ssnd_offset;
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int i_ssnd_blocksize;
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/* real data start */
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int64_t i_ssnd_start;
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int64_t i_ssnd_end;
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int i_ssnd_fsize;
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int64_t i_time;
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};
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static int Demux ( demux_t *p_demux );
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static int Control( demux_t *p_demux, int i_query, va_list args );
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/* GetF80BE: read a 80 bits float in big endian */
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static unsigned int GetF80BE( const uint8_t p[10] )
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{
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unsigned int i_mantissa = GetDWBE( &p[2] );
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int i_exp = 30 - p[1];
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unsigned int i_last = 0;
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while( i_exp-- )
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{
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i_last = i_mantissa;
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i_mantissa >>= 1;
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}
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if( i_last&0x01 )
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{
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i_mantissa++;
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}
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return i_mantissa;
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}
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/*****************************************************************************
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* Open
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*****************************************************************************/
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static int Open( vlc_object_t *p_this )
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{
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demux_t *p_demux = (demux_t*)p_this;
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demux_sys_t *p_sys;
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const uint8_t *p_peek;
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if( stream_Peek( p_demux->s, &p_peek, 12 ) < 12 )
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return VLC_EGENERIC;
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if( memcmp( p_peek, "FORM", 4 )
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|| memcmp( &p_peek[8], "AIFF", 4 ) )
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return VLC_EGENERIC;
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/* skip aiff header */
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stream_Read( p_demux->s, NULL, 12 );
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/* Fill p_demux field */
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DEMUX_INIT_COMMON(); p_sys = p_demux->p_sys;
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es_format_Init( &p_sys->fmt, UNKNOWN_ES, 0 );
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p_sys->i_time = 1;
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p_sys->i_ssnd_pos = -1;
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for( ;; )
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{
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uint32_t i_size;
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CHECK_PEEK_GOTO( p_peek, 8 );
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i_size = GetDWBE( &p_peek[4] );
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msg_Dbg( p_demux, "chunk fcc=%4.4s size=%d", p_peek, i_size );
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if( !memcmp( p_peek, "COMM", 4 ) )
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{
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CHECK_PEEK_GOTO( p_peek, 18+8 );
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es_format_Init( &p_sys->fmt, AUDIO_ES, VLC_FOURCC( 't', 'w', 'o', 's' ) );
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p_sys->fmt.audio.i_channels = GetWBE( &p_peek[8] );
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p_sys->fmt.audio.i_bitspersample = GetWBE( &p_peek[14] );
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p_sys->fmt.audio.i_rate = GetF80BE( &p_peek[16] );
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msg_Dbg( p_demux, "COMM: channels=%d samples_frames=%d bits=%d rate=%d",
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GetWBE( &p_peek[8] ), GetDWBE( &p_peek[10] ), GetWBE( &p_peek[14] ), GetF80BE( &p_peek[16] ) );
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}
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else if( !memcmp( p_peek, "SSND", 4 ) )
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{
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CHECK_PEEK_GOTO( p_peek, 8+8 );
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p_sys->i_ssnd_pos = stream_Tell( p_demux->s );
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p_sys->i_ssnd_size = i_size;
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p_sys->i_ssnd_offset = GetDWBE( &p_peek[8] );
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p_sys->i_ssnd_blocksize = GetDWBE( &p_peek[12] );
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msg_Dbg( p_demux, "SSND: (offset=%d blocksize=%d)",
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p_sys->i_ssnd_offset, p_sys->i_ssnd_blocksize );
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}
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if( p_sys->i_ssnd_pos >= 12 && p_sys->fmt.i_cat == AUDIO_ES )
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{
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/* We have found the 2 needed chunks */
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break;
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}
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/* Skip this chunk */
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i_size += 8;
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if( (i_size % 2) != 0 )
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i_size++;
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if( stream_Read( p_demux->s, NULL, i_size ) != (int)i_size )
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{
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msg_Warn( p_demux, "incomplete file" );
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goto error;
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}
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}
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p_sys->i_ssnd_start = p_sys->i_ssnd_pos + 16 + p_sys->i_ssnd_offset;
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p_sys->i_ssnd_end = p_sys->i_ssnd_start + p_sys->i_ssnd_size;
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p_sys->i_ssnd_fsize = p_sys->fmt.audio.i_channels *
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((p_sys->fmt.audio.i_bitspersample + 7) / 8);
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if( p_sys->i_ssnd_fsize <= 0 )
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{
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msg_Err( p_demux, "invalid audio parameters" );
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goto error;
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}
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if( p_sys->i_ssnd_size <= 0 )
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{
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/* unknown */
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p_sys->i_ssnd_end = 0;
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}
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/* seek into SSND chunk */
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if( stream_Seek( p_demux->s, p_sys->i_ssnd_start ) )
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{
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msg_Err( p_demux, "cannot seek to data chunk" );
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goto error;
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}
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/* */
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p_sys->es = es_out_Add( p_demux->out, &p_sys->fmt );
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return VLC_SUCCESS;
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error:
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free( p_sys );
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return VLC_EGENERIC;
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}
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/*****************************************************************************
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* Close
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*****************************************************************************/
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static void Close( vlc_object_t *p_this )
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{
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demux_t *p_demux = (demux_t*)p_this;
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demux_sys_t *p_sys = p_demux->p_sys;
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free( p_sys );
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}
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/*****************************************************************************
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* Demux:
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*****************************************************************************/
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static int Demux( demux_t *p_demux )
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{
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demux_sys_t *p_sys = p_demux->p_sys;
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int64_t i_tell = stream_Tell( p_demux->s );
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block_t *p_block;
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int i_read;
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if( p_sys->i_ssnd_end > 0 && i_tell >= p_sys->i_ssnd_end )
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{
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/* EOF */
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return 0;
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}
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/* Set PCR */
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es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_time);
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/* we will read 100ms at once */
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i_read = p_sys->i_ssnd_fsize * ( p_sys->fmt.audio.i_rate / 10 );
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if( p_sys->i_ssnd_end > 0 && p_sys->i_ssnd_end - i_tell < i_read )
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{
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i_read = p_sys->i_ssnd_end - i_tell;
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}
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if( ( p_block = stream_Block( p_demux->s, i_read ) ) == NULL )
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{
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return 0;
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}
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p_block->i_dts =
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p_block->i_pts = p_sys->i_time;
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p_sys->i_time += (int64_t)1000000 *
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p_block->i_buffer /
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p_sys->i_ssnd_fsize /
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p_sys->fmt.audio.i_rate;
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/* */
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es_out_Send( p_demux->out, p_sys->es, p_block );
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return 1;
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}
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/*****************************************************************************
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* Control:
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*****************************************************************************/
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static int Control( demux_t *p_demux, int i_query, va_list args )
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{
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demux_sys_t *p_sys = p_demux->p_sys;
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double f, *pf;
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int64_t *pi64;
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switch( i_query )
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{
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case DEMUX_GET_POSITION:
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{
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int64_t i_start = p_sys->i_ssnd_start;
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int64_t i_end = p_sys->i_ssnd_end > 0 ? p_sys->i_ssnd_end : stream_Size( p_demux->s );
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int64_t i_tell = stream_Tell( p_demux->s );
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pf = (double*) va_arg( args, double* );
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if( i_start < i_end )
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{
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*pf = (double)(i_tell - i_start)/(double)(i_end - i_start);
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return VLC_SUCCESS;
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}
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return VLC_EGENERIC;
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}
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case DEMUX_SET_POSITION:
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{
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int64_t i_start = p_sys->i_ssnd_start;
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int64_t i_end = p_sys->i_ssnd_end > 0 ? p_sys->i_ssnd_end : stream_Size( p_demux->s );
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f = (double) va_arg( args, double );
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if( i_start < i_end )
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{
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int i_frame = (f * ( i_end - i_start )) / p_sys->i_ssnd_fsize;
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int64_t i_new = i_start + i_frame * p_sys->i_ssnd_fsize;
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if( stream_Seek( p_demux->s, i_new ) )
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{
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return VLC_EGENERIC;
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}
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p_sys->i_time = 1 + (int64_t)1000000 * i_frame / p_sys->fmt.audio.i_rate;
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return VLC_SUCCESS;
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}
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return VLC_EGENERIC;
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}
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case DEMUX_GET_TIME:
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pi64 = (int64_t*)va_arg( args, int64_t * );
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*pi64 = p_sys->i_time;
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return VLC_SUCCESS;
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case DEMUX_GET_LENGTH:
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{
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int64_t i_end = p_sys->i_ssnd_end > 0 ? p_sys->i_ssnd_end : stream_Size( p_demux->s );
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pi64 = (int64_t*)va_arg( args, int64_t * );
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if( p_sys->i_ssnd_start < i_end )
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{
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*pi64 = (int64_t)1000000 * ( i_end - p_sys->i_ssnd_start ) / p_sys->i_ssnd_fsize / p_sys->fmt.audio.i_rate;
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return VLC_SUCCESS;
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}
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return VLC_EGENERIC;
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}
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case DEMUX_SET_TIME:
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case DEMUX_GET_FPS:
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default:
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return VLC_EGENERIC;
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}
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}
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