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250 lines
8.3 KiB
250 lines
8.3 KiB
/*****************************************************************************
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* dirac.c : Dirac Video demuxer
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*****************************************************************************
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* Copyright (C) 2002-2008 VLC authors and VideoLAN
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* $Id$
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*
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* Authors: David Flynn <davidf@rd.bbc.co.uk>
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* Based on vc1.c by: 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 it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* 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_common.h>
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#include <vlc_plugin.h>
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#include <vlc_demux.h>
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#include <vlc_codec.h>
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#define DEMUX_CFG_PREFIX "dirac-"
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#define DEMUX_DTSOFFSET "dts-offset"
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#define DEMUX_DTSOFFSET_TEXT N_("Value to adjust dts by")
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#define DEMUX_DTSOFFSET_LONGTEXT DEMUX_DTSOFFSET_TEXT
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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_shortname( "Dirac");
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set_category( CAT_INPUT );
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set_subcategory( SUBCAT_INPUT_DEMUX );
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set_description( N_("Dirac video demuxer" ) );
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set_capability( "demux", 50 );
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add_integer( DEMUX_CFG_PREFIX DEMUX_DTSOFFSET, 0,
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DEMUX_DTSOFFSET_TEXT, DEMUX_DTSOFFSET_LONGTEXT, false )
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set_callbacks( Open, Close );
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add_shortcut( "dirac" )
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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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vlc_tick_t i_dts;
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vlc_tick_t i_dtsoffset;
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vlc_tick_t i_pts_offset_lowtide;
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es_out_id_t *p_es;
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enum {
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/* demuxer states, do not reorder (++ is used) */
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DIRAC_DEMUX_DISCONT = 0, /* signal a discontinuity to packetizer */
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DIRAC_DEMUX_FIRST, /* provide an origin timestamp for the packetizer */
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DIRAC_DEMUX_STEADY, /* normal operation */
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} i_state;
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decoder_t *p_packetizer;
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};
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static int Demux( demux_t * );
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static int Control( demux_t *, int, va_list );
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#define DIRAC_PACKET_SIZE 4096
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/*****************************************************************************
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* Open: initializes demux structures
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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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es_format_t fmt;
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if( vlc_stream_Peek( p_demux->s, &p_peek, 5 ) < 5 ) return VLC_EGENERIC;
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if( p_peek[0] != 'B' || p_peek[1] != 'B' ||
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p_peek[2] != 'C' || p_peek[3] != 'D') /* start of ParseInfo */
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{
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if( !p_demux->obj.force ) return VLC_EGENERIC;
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msg_Err( p_demux, "This doesn't look like a Dirac stream (incorrect parsecode)" );
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msg_Warn( p_demux, "continuing anyway" );
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}
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p_demux->pf_demux = Demux;
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p_demux->pf_control = Control;
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p_demux->p_sys = p_sys = calloc( 1, sizeof( demux_sys_t ) );
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if( !p_sys ) return VLC_ENOMEM;
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p_sys->i_pts_offset_lowtide = INT64_MAX;
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p_sys->i_state = DIRAC_DEMUX_FIRST;
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p_sys->i_dtsoffset = var_CreateGetInteger( p_demux, DEMUX_CFG_PREFIX DEMUX_DTSOFFSET );
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/* Load the packetizer */
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es_format_Init( &fmt, VIDEO_ES, VLC_CODEC_DIRAC );
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p_sys->p_packetizer = demux_PacketizerNew( p_demux, &fmt, "dirac" );
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if( !p_sys->p_packetizer )
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{
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free( p_sys );
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return VLC_EGENERIC;
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}
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return VLC_SUCCESS;
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}
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/*****************************************************************************
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* Close: frees unused data
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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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demux_PacketizerDestroy( p_sys->p_packetizer );
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if( p_sys->i_pts_offset_lowtide < INT64_MAX &&
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p_sys->i_pts_offset_lowtide > 0 )
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{
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msg_Warn( p_demux, "For all packets seen, pts-dts (%"PRId64") could be reduced to 0",
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p_sys->i_pts_offset_lowtide );
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}
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free( p_sys );
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}
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/*****************************************************************************
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* Demux: reads and demuxes data packets
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*****************************************************************************
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* Returns -1 in case of error, 0 in case of EOF, 1 otherwise
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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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block_t *p_block_in, *p_block_out;
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bool b_eof = false;
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if( p_sys->i_state == DIRAC_DEMUX_DISCONT )
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{
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p_sys->i_state++;
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p_block_in = block_Alloc( 128 );
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if( p_block_in )
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{
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p_block_in->i_flags = BLOCK_FLAG_DISCONTINUITY | BLOCK_FLAG_CORRUPTED;
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}
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}
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else
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{
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p_block_in = vlc_stream_Block( p_demux->s, DIRAC_PACKET_SIZE );
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if( !p_block_in )
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{
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b_eof = true;
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}
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else if ( p_sys->i_state == DIRAC_DEMUX_FIRST)
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{
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p_sys->i_state++;
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/* by default, timestamps are invalid.
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* Except when we need an anchor point */
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p_block_in->i_dts = VLC_TICK_0;
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}
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}
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while( (p_block_out = p_sys->p_packetizer->pf_packetize( p_sys->p_packetizer,
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(p_block_in) ? &p_block_in : NULL )) )
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{
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while( p_block_out )
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{
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block_t *p_next = p_block_out->p_next;
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p_block_out->p_next = NULL;
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if( p_sys->p_es == NULL )
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p_sys->p_es = es_out_Add( p_demux->out, &p_sys->p_packetizer->fmt_out);
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p_block_out->i_dts += p_sys->i_dtsoffset;
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p_sys->i_dts = p_block_out->i_dts;
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/* track low watermark for pts_offset -- can be used to show
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* when it is too large */
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vlc_tick_t i_delay = p_block_out->i_pts - p_block_out->i_dts;
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if( p_sys->i_pts_offset_lowtide > i_delay )
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{
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p_sys->i_pts_offset_lowtide = i_delay;
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}
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es_out_SetPCR( p_demux->out, p_block_out->i_dts );
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es_out_Send( p_demux->out, p_sys->p_es, p_block_out );
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p_block_out = p_next;
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}
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}
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return b_eof ? VLC_DEMUXER_EOF : VLC_DEMUXER_SUCCESS;
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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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if( DEMUX_GET_TIME == i_query )
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{
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int64_t *pi64 = va_arg( args, int64_t * );
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*pi64 = p_sys->i_dts;
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return VLC_SUCCESS;
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}
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else if( DEMUX_GET_FPS == i_query )
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{
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if( !p_sys->p_packetizer->fmt_out.video.i_frame_rate )
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{
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return VLC_EGENERIC;
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}
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double *pd = va_arg( args, double * );
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*pd = (float) p_sys->p_packetizer->fmt_out.video.i_frame_rate
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/ p_sys->p_packetizer->fmt_out.video.i_frame_rate_base;
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return VLC_SUCCESS;
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}
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else
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{
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if( DEMUX_SET_POSITION == i_query || DEMUX_SET_TIME == i_query )
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{
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p_sys->i_state = DIRAC_DEMUX_DISCONT;
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}
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return demux_vaControlHelper( p_demux->s, 0, -1, 0, 1, i_query, args );
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}
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}
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