--- /dev/null
+/*****************************************************************************
+ * tta.c : The Lossless True Audio parser
+ *****************************************************************************
+ * Copyright (C) 2006 the VideoLAN team
+ * $Id$
+ *
+ * Authors: Derk-Jan Hartman <hartman at videolan dot org>
+ *
+ * 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
+ *****************************************************************************/
+#include <vlc/vlc.h>
+#include <vlc/input.h>
+#include <vlc_codec.h>
+#include <math.h>
+
+/*****************************************************************************
+ * Module descriptor
+ *****************************************************************************/
+static int Open ( vlc_object_t * );
+static void Close ( vlc_object_t * );
+
+vlc_module_begin();
+ set_shortname( "TTA" );
+ set_description( _("TTA demuxer") );
+ set_category( CAT_INPUT );
+ set_subcategory( SUBCAT_INPUT_DEMUX );
+ set_capability( "demux2", 145 );
+
+ set_callbacks( Open, Close );
+ add_shortcut( "tta" );
+vlc_module_end();
+
+#define TTA_FRAMETIME 1.04489795918367346939
+
+/*****************************************************************************
+ * Local prototypes
+ *****************************************************************************/
+static int Demux ( demux_t * );
+static int Control( demux_t *, int, va_list );
+
+struct demux_sys_t
+{
+ /* */
+ es_out_id_t *p_es;
+
+ /* */
+ int i_totalframes;
+ int i_currentframe;
+ uint32_t *pi_seektable;
+ int i_datalength;
+ int i_framelength;
+
+ /* */
+ vlc_meta_t *p_meta;
+ int64_t i_start;
+};
+
+/*****************************************************************************
+ * Open: initializes ES structures
+ *****************************************************************************/
+static int Open( vlc_object_t * p_this )
+{
+ demux_t *p_demux = (demux_t*)p_this;
+ demux_sys_t *p_sys;
+ es_format_t fmt;
+ uint8_t *p_peek;
+ uint8_t p_header[22];
+ uint8_t *p_seektable;
+ int i_seektable_size = 0, i;
+ //char psz_info[4096];
+ //module_t *p_id3;
+
+ if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 )
+ return VLC_EGENERIC;
+
+ if( !POKE( p_peek, "TTA1", 4 ) )
+ {
+ if( !p_demux->b_force ) return VLC_EGENERIC;
+
+ /* User forced */
+ msg_Err( p_demux, "this doesn't look like a flac stream, "
+ "continuing anyway" );
+ }
+
+ if( stream_Read( p_demux->s, p_header, 22 ) < 22 )
+ return VLC_EGENERIC;
+
+ /* Fill p_demux fields */
+ p_demux->pf_demux = Demux;
+ p_demux->pf_control = Control;
+ p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
+
+ /* Read the metadata */
+ es_format_Init( &fmt, AUDIO_ES, VLC_FOURCC( 'T', 'T', 'A', '1' ) );
+ fmt.audio.i_channels = GetWLE( &p_header[6] );
+ fmt.audio.i_bitspersample = GetWLE( &p_header[8] );
+ fmt.audio.i_rate = GetDWLE( &p_header[10] );
+
+ p_sys->i_datalength = GetDWLE( &p_header[14] );
+ p_sys->i_framelength = TTA_FRAMETIME * fmt.audio.i_rate;
+
+ p_sys->i_totalframes = p_sys->i_datalength / p_sys->i_framelength +
+ ((p_sys->i_datalength % p_sys->i_framelength) ? 1 : 0);
+ p_sys->i_currentframe = 0;
+
+ i_seektable_size = sizeof(uint32_t)*p_sys->i_totalframes;
+ p_seektable = (uint8_t *)malloc( i_seektable_size );
+ stream_Read( p_demux->s, p_seektable, i_seektable_size );
+ p_sys->pi_seektable = (uint32_t *)malloc(i_seektable_size);
+
+ for( i = 0; i < p_sys->i_totalframes; i++ )
+ p_sys->pi_seektable[i] = GetDWLE( &p_seektable[i*4] );
+
+ stream_Read( p_demux->s, NULL, 4 ); /* CRC */
+
+ /* Store the header and Seektable for avcodec */
+ fmt.i_extra = 22 + (p_sys->i_totalframes * 4) + 4;
+ fmt.p_extra = malloc( fmt.i_extra );
+ memcpy( fmt.p_extra, p_header, 22 );
+ memcpy( fmt.p_extra+22, p_seektable, fmt.i_extra -22 );
+
+ p_sys->p_es = es_out_Add( p_demux->out, &fmt );
+ free( p_seektable );
+ p_sys->i_start = stream_Tell( p_demux->s );
+
+#if 0
+ /* Parse possible id3 header */
+ if( ( p_id3 = module_Need( p_demux, "meta reader", NULL, 0 ) ) )
+ {
+ p_sys->p_meta = (vlc_meta_t *)p_demux->p_private;
+ p_demux->p_private = NULL;
+ module_Unneed( p_demux, p_id3 );
+ }
+
+ if( !p_sys->p_meta )
+ p_sys->p_meta = vlc_meta_New();
+#endif
+ return VLC_SUCCESS;
+}
+
+/*****************************************************************************
+ * Close: frees unused data
+ *****************************************************************************/
+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:
+ *****************************************************************************
+ * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
+ *****************************************************************************/
+static int Demux( demux_t *p_demux )
+{
+ demux_sys_t *p_sys = p_demux->p_sys;
+ block_t *p_data;
+
+ if( p_sys->i_currentframe > p_sys->i_totalframes )
+ return 0;
+
+ p_data = stream_Block( p_demux->s, p_sys->pi_seektable[p_sys->i_currentframe] );
+ if( p_data == NULL ) return 0;
+ p_data->i_dts = p_data->i_pts = (int64_t)(1 + I64C(1000000) * p_sys->i_currentframe) * TTA_FRAMETIME;
+
+ p_sys->i_currentframe++;
+
+ es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_data->i_dts );
+ es_out_Send( p_demux->out, p_sys->p_es, p_data );
+
+ 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 i64, *pi64;
+ vlc_meta_t *p_meta;
+
+ switch( i_query )
+ {
+ case DEMUX_GET_POSITION:
+ pf = (double*) va_arg( args, double* );
+ i64 = stream_Size( p_demux->s ) - p_sys->i_start;
+ if( i64 > 0 )
+ {
+ *pf = (double)(stream_Tell( p_demux->s ) - p_sys->i_start )/ (double)i64;
+ }
+ else
+ {
+ *pf = 0.0;
+ }
+ return VLC_SUCCESS;
+
+ case DEMUX_SET_POSITION:
+ f = (double)va_arg( args, double );
+ i64 = (int64_t)(f * (stream_Size( p_demux->s ) - p_sys->i_start));
+ es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
+ if( i64 > 0 )
+ {
+ int64_t tmp = 0;
+ int i;
+ for( i=0; i < p_sys->i_totalframes && tmp+p_sys->pi_seektable[i] < i64; i++)
+ {
+ tmp += p_sys->pi_seektable[i];
+ }
+ stream_Seek( p_demux->s, tmp+p_sys->i_start );
+ p_sys->i_currentframe = i;
+ return VLC_SUCCESS;
+ }
+ return VLC_EGENERIC;
+
+ case DEMUX_GET_LENGTH:
+ pi64 = (int64_t*)va_arg( args, int64_t * );
+ *pi64 = I64C(1000000) * p_sys->i_totalframes * TTA_FRAMETIME;
+ return VLC_SUCCESS;
+
+ case DEMUX_GET_TIME:
+ pi64 = (int64_t*)va_arg( args, int64_t * );
+ *pi64 = I64C(1000000) * p_sys->i_currentframe * TTA_FRAMETIME;
+ return VLC_SUCCESS;
+
+ default:
+ return VLC_EGENERIC;
+ }
+}
+
projects / vlc / commitdiff