/***************************************************************************** * mpgv.c : MPEG-I/II Video demuxer ***************************************************************************** * Copyright (C) 2001-2003 VideoLAN * $Id: mpgv.c,v 1.5 2004/01/25 20:05:28 hartman 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>#include "vlc_codec.h"/***************************************************************************** * Module descriptor *****************************************************************************/static int  Open    ( vlc_object_t * );static void Close  ( vlc_object_t * );vlc_module_begin();    set_description( _("MPEG-I/II video demuxer" ) );    set_capability( "demux", 100 );    set_callbacks( Open, Close );    add_shortcut( "mpgv" );vlc_module_end();/* TODO: * - free bitrate *//***************************************************************************** * Local prototypes *****************************************************************************/static int  Demux       ( input_thread_t * );struct demux_sys_t{    vlc_bool_t  b_start;    es_out_id_t *p_es;    decoder_t *p_packetizer;};#define MPGV_PACKET_SIZE 4096/***************************************************************************** * Open: initializes demux structures *****************************************************************************/static int Open( vlc_object_t * p_this ){    input_thread_t *p_input = (input_thread_t *)p_this;    demux_sys_t    *p_sys;    vlc_bool_t     b_forced = VLC_FALSE;    uint8_t        *p_peek;    es_format_t    fmt;    char psz_description[50];    if( stream_Peek( p_input->s, &p_peek, 4 ) < 4 )    {        msg_Err( p_input, "cannot peek" );        return VLC_EGENERIC;    }    if( p_input->psz_demux && !strncmp( p_input->psz_demux, "mpgv", 4 ) )    {        b_forced = VLC_TRUE;    }    if( p_peek[0] != 0x00 || p_peek[1] != 0x00 || p_peek[2] != 0x01 )    {        if( !b_forced )        {            msg_Warn( p_input, "ES module discarded (no startcode)" );            return VLC_EGENERIC;        }        msg_Err( p_input, "this doesn't look like an MPEG ES stream, continuing" );    }    if( p_peek[3] > 0xb9 )    {        if( !b_forced )        {            msg_Warn( p_input, "ES module discarded (system startcode)" );            return VLC_EGENERIC;        }        msg_Err( p_input, "this seems to be a system stream (PS plug-in ?), but continuing" );    }    vlc_mutex_lock( &p_input->stream.stream_lock );    if( input_InitStream( p_input, 0 ) == -1)    {        vlc_mutex_unlock( &p_input->stream.stream_lock );        msg_Err( p_input, "cannot init stream" );        return VLC_EGENERIC;    }    p_input->stream.i_mux_rate = 0 / 50;    vlc_mutex_unlock( &p_input->stream.stream_lock );    p_input->pf_demux  = Demux;    p_input->pf_rewind = NULL;    p_input->pf_demux_control = demux_vaControlDefault;    p_input->p_demux_data = p_sys = malloc( sizeof( demux_sys_t ) );    p_sys->b_start = VLC_TRUE;    p_sys->p_es    = NULL;    /*     * Load the mpegvideo packetizer     */    p_sys->p_packetizer = vlc_object_create( p_input, VLC_OBJECT_PACKETIZER );    p_sys->p_packetizer->pf_decode_audio = NULL;    p_sys->p_packetizer->pf_decode_video = NULL;    p_sys->p_packetizer->pf_decode_sub = NULL;    p_sys->p_packetizer->pf_packetize = NULL;    es_format_Init( &p_sys->p_packetizer->fmt_in,  VIDEO_ES,   VLC_FOURCC( 'm', 'p', 'g', 'v' ) );    es_format_Init( &p_sys->p_packetizer->fmt_out, UNKNOWN_ES, 0 );    p_sys->p_packetizer->p_module =        module_Need( p_sys->p_packetizer, "packetizer", NULL );    if( p_sys->p_packetizer->p_module == NULL)    {        vlc_object_destroy( p_sys->p_packetizer );        msg_Err( p_input, "cannot find mpgv packetizer" );        free( p_sys );        return VLC_EGENERIC;    }    /*     * create the output     */    es_format_Init( &fmt, VIDEO_ES, VLC_FOURCC( 'm', 'p', 'g', 'v' ) );    sprintf( psz_description, "MPEG-I/II Video" );    fmt.psz_description = strdup( psz_description );    p_sys->p_es = es_out_Add( p_input->p_es_out, &fmt );    return VLC_SUCCESS;}/***************************************************************************** * Close: frees unused data *****************************************************************************/static void Close( vlc_object_t * p_this ){    input_thread_t *p_input = (input_thread_t*)p_this;    demux_sys_t    *p_sys = p_input->p_demux_data;    module_Unneed( p_sys->p_packetizer, p_sys->p_packetizer->p_module );    vlc_object_destroy( p_sys->p_packetizer );    free( p_sys );}/***************************************************************************** * Demux: reads and demuxes data packets ***************************************************************************** * Returns -1 in case of error, 0 in case of EOF, 1 otherwise *****************************************************************************/static int Demux( input_thread_t * p_input ){    demux_sys_t  *p_sys = p_input->p_demux_data;    block_t *p_block_in, *p_block_out;    if( ( p_block_in = stream_Block( p_input->s, MPGV_PACKET_SIZE ) ) == NULL )    {        return 0;    }    if( p_sys->b_start )    {        p_block_in->i_pts =        p_block_in->i_dts = 1;    }    else    {        p_block_in->i_pts =        p_block_in->i_dts = 0;    }    while( (p_block_out = p_sys->p_packetizer->pf_packetize( p_sys->p_packetizer, &p_block_in )) )    {        p_sys->b_start = VLC_FALSE;        while( p_block_out )        {            block_t *p_next = p_block_out->p_next;            input_ClockManageRef( p_input,                                  p_input->stream.p_selected_program,                                  p_block_out->i_dts * 9 / 100 );            p_block_out->i_dts =                input_ClockGetTS( p_input, p_input->stream.p_selected_program,                                  p_block_out->i_dts * 9 / 100 );            if( p_block_out->i_pts > 0 )            {                p_block_out->i_pts =                    input_ClockGetTS( p_input, p_input->stream.p_selected_program,                                      p_block_out->i_pts * 9 / 100 );            }            else            {                p_block_out->i_pts = 0;            }            p_block_out->p_next = NULL;            es_out_Send( p_input->p_es_out, p_sys->p_es, p_block_out );            p_block_out = p_next;        }    }    return 1;}