/*****************************************************************************
* dtstospdif.c : encapsulates DTS frames into S/PDIF packets
*****************************************************************************
- * Copyright (C) 2003 VideoLAN
- * $Id: dtstospdif.c,v 1.1 2003/03/09 20:07:47 jlj Exp $
+ * Copyright (C) 2003, 2006 the VideoLAN team
+ * $Id$
*
* Authors: Jon Lech Johansen <jon-vl@nanocrew.net>
*
* 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
*
* 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.
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
-#include <stdlib.h> /* malloc(), free() */
-#include <string.h>
-
#include <vlc/vlc.h>
+
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
-#include "audio_output.h"
-#include "aout_internal.h"
+#include <vlc_aout.h>
+
+/*****************************************************************************
+ * Local structures
+ *****************************************************************************/
+struct aout_filter_sys_t
+{
+ /* 3 DTS frames have to be packed into an S/PDIF frame.
+ * We accumulate DTS frames from the decoder until we have enough to
+ * send. */
+
+ uint8_t *p_buf;
+
+ mtime_t start_date;
+
+ int i_frames;
+ unsigned int i_frame_size;
+};
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static int Create ( vlc_object_t * );
+static void Close ( vlc_object_t * );
static void DoWork ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
aout_buffer_t * );
* Module descriptor
*****************************************************************************/
vlc_module_begin();
- set_description( _("audio filter for DTS->S/PDIF encapsulation") );
+ set_category( CAT_AUDIO );
+ set_subcategory( SUBCAT_AUDIO_MISC );
+ set_description( _("Audio filter for DTS->S/PDIF encapsulation") );
set_capability( "audio filter", 10 );
- set_callbacks( Create, NULL );
+ set_callbacks( Create, Close );
vlc_module_end();
/*****************************************************************************
{
aout_filter_t * p_filter = (aout_filter_t *)p_this;
- if ( p_filter->input.i_format != VLC_FOURCC('d','t','s',' ')
- || p_filter->output.i_format != VLC_FOURCC('s','p','d','i') )
+ if( p_filter->input.i_format != VLC_FOURCC('d','t','s',' ') ||
+ ( p_filter->output.i_format != VLC_FOURCC('s','p','d','i') &&
+ p_filter->output.i_format != VLC_FOURCC('s','p','d','b') ) )
{
return -1;
}
+ /* Allocate the memory needed to store the module's structure */
+ p_filter->p_sys = malloc( sizeof(struct aout_filter_sys_t) );
+ if( p_filter->p_sys == NULL )
+ {
+ msg_Err( p_filter, "out of memory" );
+ return VLC_ENOMEM;
+ }
+ memset( p_filter->p_sys, 0, sizeof(struct aout_filter_sys_t) );
+ p_filter->p_sys->p_buf = 0;
+
p_filter->pf_do_work = DoWork;
- p_filter->b_in_place = 0;
+ p_filter->b_in_place = 1;
return 0;
}
+/*****************************************************************************
+ * Close: free our resources
+ *****************************************************************************/
+static void Close( vlc_object_t * p_this )
+{
+ aout_filter_t * p_filter = (aout_filter_t *)p_this;
+ if( p_filter->p_sys->i_frame_size ) free( p_filter->p_sys->p_buf );
+ free( p_filter->p_sys );
+}
+
/*****************************************************************************
* DoWork: convert a buffer
*****************************************************************************/
static void DoWork( aout_instance_t * p_aout, aout_filter_t * p_filter,
aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
{
- uint16_t i_fz = (p_in_buf->i_nb_samples / 3) * 4;
- uint16_t i_frame, i_length = p_in_buf->i_nb_bytes / 3;
- static const uint8_t p_sync[6] = { 0x72, 0xF8, 0x1F, 0x4E, 0x00, 0x00 };
+ uint32_t i_ac5_spdif_type = 0;
+ uint16_t i_fz = p_in_buf->i_nb_samples * 4;
+ uint16_t i_frame, i_length = p_in_buf->i_nb_bytes;
+ static const uint8_t p_sync_le[6] = { 0x72, 0xF8, 0x1F, 0x4E, 0x00, 0x00 };
+ static const uint8_t p_sync_be[6] = { 0xF8, 0x72, 0x4E, 0x1F, 0x00, 0x00 };
+
+ if( p_in_buf->i_nb_bytes != p_filter->p_sys->i_frame_size )
+ {
+ /* Frame size changed, reset everything */
+ p_filter->p_sys->i_frame_size = p_in_buf->i_nb_bytes;
+ p_filter->p_sys->p_buf = realloc( p_filter->p_sys->p_buf,
+ p_in_buf->i_nb_bytes * 3 );
+ p_filter->p_sys->i_frames = 0;
+ }
+
+ /* Backup frame */
+ p_filter->p_libvlc->pf_memcpy( p_filter->p_sys->p_buf + p_in_buf->i_nb_bytes *
+ p_filter->p_sys->i_frames, p_in_buf->p_buffer,
+ p_in_buf->i_nb_bytes );
+
+ p_filter->p_sys->i_frames++;
+
+ if( p_filter->p_sys->i_frames < 3 )
+ {
+ if( !p_filter->p_sys->i_frames )
+ /* We'll need the starting date */
+ p_filter->p_sys->start_date = p_in_buf->start_date;
+
+ /* Not enough data */
+ p_out_buf->i_nb_samples = 0;
+ p_out_buf->i_nb_bytes = 0;
+ return;
+ }
+
+ p_filter->p_sys->i_frames = 0;
for( i_frame = 0; i_frame < 3; i_frame++ )
{
-#ifndef HAVE_SWAB
- uint16_t i;
- byte_t * p_tmp;
-#endif
byte_t * p_out = p_out_buf->p_buffer + (i_frame * i_fz);
- byte_t * p_in = p_in_buf->p_buffer + (i_frame * i_length);
+ byte_t * p_in = p_filter->p_sys->p_buf + (i_frame * i_length);
- /* Copy the S/PDIF headers. */
- memcpy( p_out, p_sync, 6 );
-
- switch( p_in_buf->i_nb_samples / 3 )
+ switch( p_in_buf->i_nb_samples )
{
- case 512: *(p_out + 4) = 0x0B; break;
- case 1024: *(p_out + 4) = 0x0C; break;
- case 2048: *(p_out + 4) = 0x0D; break;
+ case 512: i_ac5_spdif_type = 0x0B; break;
+ case 1024: i_ac5_spdif_type = 0x0C; break;
+ case 2048: i_ac5_spdif_type = 0x0D; break;
}
- *(p_out + 6) = (i_length * 8) & 0xff;
- *(p_out + 7) = (i_length * 8) >> 8;
+ /* Copy the S/PDIF headers. */
+ if( p_filter->output.i_format == VLC_FOURCC('s','p','d','b') )
+ {
+ p_filter->p_libvlc->pf_memcpy( p_out, p_sync_be, 6 );
+ p_out[5] = i_ac5_spdif_type;
+ p_out[6] = (( i_length ) >> 5 ) & 0xFF;
+ p_out[7] = ( i_length << 3 ) & 0xFF;
+ }
+ else
+ {
+ p_filter->p_libvlc->pf_memcpy( p_out, p_sync_le, 6 );
+ p_out[4] = i_ac5_spdif_type;
+ p_out[6] = ( i_length << 3 ) & 0xFF;
+ p_out[7] = (( i_length ) >> 5 ) & 0xFF;
+ }
+ if( ( (p_in[0] == 0x1F || p_in[0] == 0x7F) && p_filter->output.i_format == VLC_FOURCC('s','p','d','i') ) ||
+ ( (p_in[0] == 0xFF || p_in[0] == 0xFE) && p_filter->output.i_format == VLC_FOURCC('s','p','d','b') ) )
+ {
+ /* We are dealing with a big endian bitstream and a little endian output
+ * or a little endian bitstream and a big endian output.
+ * Byteswap the stream */
#ifdef HAVE_SWAB
- swab( p_in, p_out + 8, i_length );
+ swab( p_in, p_out + 8, i_length );
#else
- p_tmp = p_out + 8;
- for( i = i_length / 2 ; i-- ; )
+ uint16_t i;
+ byte_t * p_tmp, tmp;
+ p_tmp = p_out + 8;
+ for( i = i_length / 2 ; i-- ; )
+ {
+ tmp = p_in[0]; /* in-place filter */
+ p_tmp[0] = p_in[1];
+ p_tmp[1] = tmp;
+ p_tmp += 2; p_in += 2;
+ }
+#endif
+ }
+ else
{
- p_tmp[0] = p_in[1];
- p_tmp[1] = p_in[0];
- p_tmp += 2; p_in += 2;
+ p_filter->p_libvlc->pf_memcpy( p_out + 8, p_in, i_length );
}
-#endif
- p_filter->p_vlc->pf_memset( p_out + 8 + i_length, 0,
- i_fz - i_length - 8 );
+ if( i_fz > i_length + 8 )
+ {
+ p_filter->p_libvlc->pf_memset( p_out + 8 + i_length, 0,
+ i_fz - i_length - 8 );
+ }
}
- p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
+ p_out_buf->start_date = p_filter->p_sys->start_date;
+ p_out_buf->i_nb_samples = p_in_buf->i_nb_samples * 3;
p_out_buf->i_nb_bytes = p_out_buf->i_nb_samples * 4;
}
projects / vlc / blobdiff