* aiff: another demuxer.

modules/demux/Modules.am

@@ -19,3 +19,4 @@ SOURCES_ps2 = ps.c ps.h
 SOURCES_dvdnav = dvdnav.c
 SOURCES_mod = mod.c
 SOURCES_pva = pva.c
+SOURCES_aiff = aiff.c

modules/demux/aiff.c

+/*****************************************************************************
+ * aiff.c: Audio Interchange File Format demuxer
+ *****************************************************************************
+ * Copyright (C) 2004 VideoLAN
+ * $Id: aiff.c,v 1.1 2004/01/28 12:25:37 fenrir Exp $
+ *
+ * Authors: Laurent Aimar <fenrir@via.ecp.fr>
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Preamble
+ *****************************************************************************/
+#include <stdlib.h>                                      /* malloc(), free() */
+
+#include <vlc/vlc.h>
+#include <vlc/input.h>
+
+/* TODO:
+ *  - ...
+ */
+
+/*****************************************************************************
+ * Module descriptor
+ *****************************************************************************/
+static int  Open    ( vlc_object_t * );
+static void Close  ( vlc_object_t * );
+
+vlc_module_begin();
+    set_description( _("AIFF demuxer" ) );
+    set_capability( "demux2", 10 );
+    set_callbacks( Open, Close );
+    add_shortcut( "aiff" );
+vlc_module_end();
+
+/*****************************************************************************
+ * Local prototypes
+ *****************************************************************************/
+
+struct demux_sys_t
+{
+    es_format_t  fmt;
+    es_out_id_t *es;
+
+    int64_t     i_ssnd_pos;
+    int64_t     i_ssnd_size;
+    int         i_ssnd_offset;
+    int         i_ssnd_blocksize;
+
+    /* real data start */
+    int64_t     i_ssnd_start;
+    int64_t     i_ssnd_end;
+
+    int         i_ssnd_fsize;
+
+    int64_t     i_time;
+};
+
+static int Demux  ( demux_t *p_demux );
+static int Control( demux_t *p_demux, int i_query, va_list args );
+
+/* GetF80BE: read a 80 bits float in big endian */
+static unsigned int GetF80BE( uint8_t p[10] )
+{
+    unsigned int i_mantissa = GetDWBE( &p[2] );
+    int          i_exp = 30 - p[1];
+    unsigned int i_last = 0;
+
+    while( i_exp-- )
+    {
+        i_last = i_mantissa;
+        i_mantissa >>= 1;
+    }
+    if( i_last&0x01 )
+    {
+        i_mantissa++;
+    }
+    return i_mantissa;
+}
+
+/*****************************************************************************
+ * Open
+ *****************************************************************************/
+static int Open( vlc_object_t *p_this )
+{
+    demux_t     *p_demux = (demux_t*)p_this;
+    demux_sys_t *p_sys;
+
+    uint8_t     *p_peek;
+
+    if( stream_Peek( p_demux->s, &p_peek, 12 ) < 12 )
+    {
+        msg_Err( p_demux, "cannot peek" );
+        return VLC_EGENERIC;
+    }
+    if( strncmp( &p_peek[0], "FORM", 4 ) || strncmp( &p_peek[8], "AIFF", 4 ) )
+    {
+        msg_Warn( p_demux, "AIFF module discarded" );
+        return VLC_EGENERIC;
+    }
+
+    /* skip aiff header */
+    stream_Read( p_demux->s, NULL, 12 );
+
+    /* Fill p_demux field */
+    p_demux->pf_demux = Demux;
+    p_demux->pf_control = Control;
+    p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
+
+    es_format_Init( &p_sys->fmt, UNKNOWN_ES, 0 );
+    p_sys->i_time = 1;
+    p_sys->i_ssnd_pos = -1;
+
+    for( ;; )
+    {
+        uint32_t i_size;
+
+        if( stream_Peek( p_demux->s, &p_peek, 8 ) < 8 )
+        {
+            msg_Dbg( p_demux, "cannot peek()" );
+            goto error;
+        }
+        i_size = GetDWBE( &p_peek[4] );
+
+        msg_Dbg( p_demux, "chunk fcc=%4.4s size=%d", p_peek, i_size );
+
+        if( !strncmp( &p_peek[0], "COMM", 4 ) )
+        {
+            if( stream_Peek( p_demux->s, &p_peek, 18 + 8 ) < 18 + 8 )
+            {
+                msg_Dbg( p_demux, "cannot peek()" );
+                goto error;
+            }
+            es_format_Init( &p_sys->fmt, AUDIO_ES, VLC_FOURCC( 't', 'w', 'o', 's' ) );
+            p_sys->fmt.audio.i_channels = GetWBE( &p_peek[8] );
+            p_sys->fmt.audio.i_bitspersample = GetWBE( &p_peek[14] );
+            p_sys->fmt.audio.i_rate     = GetF80BE( &p_peek[16] );
+
+            msg_Dbg( p_demux, "COMM: channels=%d samples_frames=%d bits=%d rate=%d",
+                     GetWBE( &p_peek[8] ), GetDWBE( &p_peek[10] ), GetWBE( &p_peek[14] ), GetF80BE( &p_peek[16] ) );
+        }
+        else if( !strncmp( &p_peek[0], "SSND", 4 ) )
+        {
+            if( stream_Peek( p_demux->s, &p_peek, 8 + 8 ) < 8 + 8 )
+            {
+                msg_Dbg( p_demux, "cannot peek()" );
+                goto error;
+            }
+
+            p_sys->i_ssnd_pos = stream_Tell( p_demux->s );
+            p_sys->i_ssnd_size= i_size;
+            p_sys->i_ssnd_offset = GetDWBE( &p_peek[8] );
+            p_sys->i_ssnd_blocksize = GetDWBE( &p_peek[12] );
+
+            msg_Dbg( p_demux, "SSND: (offset=%d blocksize=%d)",
+                     p_sys->i_ssnd_offset, p_sys->i_ssnd_blocksize );
+        }
+        if( p_sys->i_ssnd_pos >= 12 && p_sys->fmt.i_cat == AUDIO_ES )
+        {
+            /* We have found the 2 needed chunks */
+            break;
+        }
+
+        /* Skip this chunk */
+        if( stream_Read( p_demux->s, NULL, i_size + 8 ) != i_size + 8 )
+        {
+            msg_Warn( p_demux, "incomplete file" );
+            goto error;
+        }
+    }
+
+    p_sys->i_ssnd_start = p_sys->i_ssnd_pos + 16 + p_sys->i_ssnd_offset;
+    p_sys->i_ssnd_end   = p_sys->i_ssnd_start + p_sys->i_ssnd_size;
+
+    p_sys->i_ssnd_fsize = p_sys->fmt.audio.i_channels *
+                          ( p_sys->fmt.audio.i_bitspersample + 7 ) / 8;
+
+    if( p_sys->i_ssnd_fsize <= 0 )
+    {
+        msg_Err( p_demux, "invalid audio parameters" );
+        goto error;
+    }
+
+    if( p_sys->i_ssnd_size <= 0 )
+    {
+        /* unknown */
+        p_sys->i_ssnd_end = 0;
+    }
+
+    /* seek into SSND chunk */
+    if( stream_Seek( p_demux->s, p_sys->i_ssnd_start ) )
+    {
+        msg_Err( p_demux, "cannot seek to data chunk" );
+        goto error;
+    }
+
+    /* */
+    p_sys->es = es_out_Add( p_demux->out, &p_sys->fmt );
+
+    return VLC_SUCCESS;
+
+error:
+    free( p_sys );
+    return VLC_EGENERIC;
+}
+
+/*****************************************************************************
+ * Close
+ *****************************************************************************/
+static void Close( vlc_object_t *p_this )
+{
+    demux_t     *p_demux = (demux_t*)p_this;
+    demux_sys_t *p_sys = p_demux->p_sys;
+
+    free( p_sys );
+}
+
+
+/*****************************************************************************
+ * Demux:
+ *****************************************************************************/
+static int Demux( demux_t *p_demux )
+{
+    demux_sys_t *p_sys = p_demux->p_sys;
+    int64_t     i_tell = stream_Tell( p_demux->s );
+
+    block_t     *p_block;
+    int         i_read;
+
+    if( p_sys->i_ssnd_end > 0 && i_tell >= p_sys->i_ssnd_end )
+    {
+        /* EOF */
+        return 0;
+    }
+
+    /* Set PCR */
+    es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_time);
+
+    /* we will read 100ms at once */
+    i_read = p_sys->i_ssnd_fsize * ( p_sys->fmt.audio.i_rate / 10 );
+    if( p_sys->i_ssnd_end > 0 && p_sys->i_ssnd_end - i_tell < i_read )
+    {
+        i_read = p_sys->i_ssnd_end - i_tell;
+    }
+    if( ( p_block = stream_Block( p_demux->s, i_read ) ) == NULL )
+    {
+        return 0;
+    }
+
+    p_block->i_dts =
+    p_block->i_pts = p_sys->i_time;
+
+    p_sys->i_time += (int64_t)1000000 *
+                     p_block->i_buffer /
+                     p_sys->i_ssnd_fsize /
+                     p_sys->fmt.audio.i_rate;
+
+    /* */
+    es_out_Send( p_demux->out, p_sys->es, p_block );
+    return 1;
+}
+
+/*****************************************************************************
+ * Control:
+ *****************************************************************************/
+static int Control( demux_t *p_demux, int i_query, va_list args )
+{
+    demux_sys_t *p_sys = p_demux->p_sys;
+    double f, *pf;
+    int64_t *pi64;
+
+    switch( i_query )
+    {
+        case DEMUX_GET_POSITION:
+        {
+            int64_t i_start = p_sys->i_ssnd_start;
+            int64_t i_end   = p_sys->i_ssnd_end > 0 ? p_sys->i_ssnd_end : stream_Size( p_demux->s );
+            int64_t i_tell  = stream_Tell( p_demux->s );
+
+            pf = (double*) va_arg( args, double* );
+
+            if( i_start < i_end )
+            {
+                *pf = (double)(i_tell - i_start)/(double)(i_end - i_start);
+                return VLC_SUCCESS;
+            }
+            return VLC_EGENERIC;
+        }
+
+        case DEMUX_SET_POSITION:
+        {
+            int64_t i_start = p_sys->i_ssnd_start;
+            int64_t i_end  = p_sys->i_ssnd_end > 0 ? p_sys->i_ssnd_end : stream_Size( p_demux->s );
+
+            f = (double) va_arg( args, double );
+
+            if( i_start < i_end )
+            {
+                int     i_frame = (f * ( i_end - i_start )) / p_sys->i_ssnd_fsize;
+                int64_t i_new   = i_start + i_frame * p_sys->i_ssnd_fsize;
+
+                if( stream_Seek( p_demux->s, i_new ) )
+                {
+                    return VLC_EGENERIC;
+                }
+                p_sys->i_time = 1 + (int64_t)1000000 * i_frame / p_sys->fmt.audio.i_rate;
+                return VLC_SUCCESS;
+            }
+            return VLC_EGENERIC;
+        }
+
+        case DEMUX_GET_TIME:
+            pi64 = (int64_t*)va_arg( args, int64_t * );
+            *pi64 = p_sys->i_time;
+            return VLC_SUCCESS;
+
+        case DEMUX_GET_LENGTH:
+        {
+            int64_t i_end  = p_sys->i_ssnd_end > 0 ? p_sys->i_ssnd_end : stream_Size( p_demux->s );
+
+            pi64 = (int64_t*)va_arg( args, int64_t * );
+            if( p_sys->i_ssnd_start < i_end )
+            {
+                *pi64 = (int64_t)1000000 * ( i_end - p_sys->i_ssnd_start ) / p_sys->i_ssnd_fsize / p_sys->fmt.audio.i_rate;
+                return VLC_SUCCESS;
+            }
+            return VLC_EGENERIC;
+        }
+        case DEMUX_SET_TIME:
+        case DEMUX_GET_FPS:
+        default:
+            return VLC_EGENERIC;
+    }
+}