ps.c

这不是一个完整的工程

/*****************************************************************************
 * ps.c: MPEG PS (ISO/IEC 13818-1) / MPEG SYSTEM (ISO/IEC 1172-1)
 *       multiplexer module for vlc
 *****************************************************************************
 * Copyright (C) 2001, 2002 VideoLAN
 * $Id: ps.c,v 1.15 2003/08/02 01:33:53 fenrir Exp $
 *
 * Authors: Laurent Aimar <[e-mail]>
 *          Eric Petit <[e-mail]>
 *          Gildas Bazin <[e-mail]>
 *
 *
 * 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>

#include <vlc/vlc.h>
#include <vlc/input.h>
#include <vlc/sout.h>

#include "codecs.h"
#include "bits.h"
#include "pes.h"

/* TODO:
 *  - test support of DTS, LPCM
 *
 */

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
static int     Open   ( vlc_object_t * );
static void    Close  ( vlc_object_t * );

vlc_module_begin();
    set_description( _("PS muxer") );
    set_capability( "sout mux", 50 );
    add_shortcut( "ps" );
    add_shortcut( "mpeg1" );
    set_callbacks( Open, Close );
vlc_module_end();


/*****************************************************************************
 * Exported prototypes
 *****************************************************************************/
static int Capability(sout_mux_t *, int, void *, void * );
static int AddStream( sout_mux_t *, sout_input_t * );
static int DelStream( sout_mux_t *, sout_input_t * );
static int Mux      ( sout_mux_t * );


/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
static int  MuxGetStream        ( sout_mux_t *, int *, mtime_t * );

static void MuxWritePackHeader  ( sout_mux_t *, sout_buffer_t **, mtime_t );
static void MuxWriteSystemHeader( sout_mux_t *, sout_buffer_t ** );

static void StreamIdInit        ( vlc_bool_t *id, int i_range );
static int  StreamIdGet         ( vlc_bool_t *id, int i_id_min, int i_id_max );
static void StreamIdRelease     ( vlc_bool_t *id, int i_id_min, int i_id );

typedef struct ps_stream_s
{
    int             i_stream_id;

} ps_stream_t;

struct sout_mux_sys_t
{
    /* Which id are unused */
    vlc_bool_t  stream_id_mpga[16]; /* 0xc0 -> 0xcf */
    vlc_bool_t  stream_id_mpgv[16]; /* 0xe0 -> 0xef */
    vlc_bool_t  stream_id_a52[8];   /* 0x80 -> 0x87 <- FIXME I'm not sure */
    vlc_bool_t  stream_id_spu[32];  /* 0x20 -> 0x3f */
    vlc_bool_t  stream_id_dts[8];   /* 0x88 -> 0x8f */
    vlc_bool_t  stream_id_lpcm[16]; /* 0xa0 -> 0xaf */

    int         i_audio_bound;
    int         i_video_bound;

    int         i_pes_count;

    int         i_system_header;

    vlc_bool_t  b_mpeg2;
};


/*****************************************************************************
 * Open:
 *****************************************************************************/
static int Open( vlc_object_t *p_this )
{
    sout_mux_t      *p_mux = (sout_mux_t*)p_this;
    sout_mux_sys_t  *p_sys;

    msg_Info( p_mux, "Open" );

    p_mux->pf_capacity  = Capability;
    p_mux->pf_addstream = AddStream;
    p_mux->pf_delstream = DelStream;
    p_mux->pf_mux       = Mux;
    p_mux->i_preheader  = 30; // really enough for a pes header
    p_mux->p_sys        = p_sys = malloc( sizeof( sout_mux_sys_t ) );

    /* Init free stream id */
    StreamIdInit( p_sys->stream_id_a52,  8  );
    StreamIdInit( p_sys->stream_id_dts,  8  );
    StreamIdInit( p_sys->stream_id_mpga, 16 );
    StreamIdInit( p_sys->stream_id_mpgv, 16 );
    StreamIdInit( p_sys->stream_id_lpcm, 16 );
    StreamIdInit( p_sys->stream_id_spu,  32 );

    p_sys->i_audio_bound   = 0;
    p_sys->i_video_bound   = 0;
    p_sys->i_system_header = 0;
    p_sys->i_pes_count     = 0;

    p_sys->b_mpeg2 = !(p_mux->psz_mux && !strcmp( p_mux->psz_mux, "mpeg1" ));

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Close:
 *****************************************************************************/
static void Close( vlc_object_t * p_this )
{
    sout_mux_t      *p_mux = (sout_mux_t*)p_this;
    sout_mux_sys_t  *p_sys = p_mux->p_sys;

    sout_buffer_t   *p_end;

    msg_Info( p_mux, "Close" );

    p_end = sout_BufferNew( p_mux->p_sout, 4 );
    p_end->p_buffer[0] = 0x00;
    p_end->p_buffer[1] = 0x00;
    p_end->p_buffer[2] = 0x01;
    p_end->p_buffer[3] = 0xb9;

    sout_AccessOutWrite( p_mux->p_access, p_end );

    free( p_sys );
}

/*****************************************************************************
 * Capability:
 *****************************************************************************/
static int Capability( sout_mux_t *p_mux, int i_query, void *p_args,
                       void *p_answer )
{
   switch( i_query )
   {
        case SOUT_MUX_CAP_GET_ADD_STREAM_ANY_TIME:
            *(vlc_bool_t*)p_answer = VLC_TRUE;
            return( SOUT_MUX_CAP_ERR_OK );
        default:
            return( SOUT_MUX_CAP_ERR_UNIMPLEMENTED );
   }
}

/*****************************************************************************
 * AddStream:
 *****************************************************************************/
static int AddStream( sout_mux_t *p_mux, sout_input_t *p_input )
{
    sout_mux_sys_t  *p_sys = p_mux->p_sys;
    ps_stream_t         *p_stream;

    msg_Dbg( p_mux, "adding input codec=%4.4s", (char*)&p_input->p_fmt->i_fourcc );

    p_input->p_sys = (void*)p_stream = malloc( sizeof( ps_stream_t ) );

    /* Init this new stream */
    switch( p_input->p_fmt->i_fourcc )
    {
        case VLC_FOURCC( 'm', 'p', 'g', 'v' ):
            p_stream->i_stream_id = StreamIdGet( p_sys->stream_id_mpgv, 0xe0, 0xef );
            break;
        case VLC_FOURCC( 'l', 'p', 'c', 'm' ):
            p_stream->i_stream_id = 0xbd00|StreamIdGet( p_sys->stream_id_lpcm, 0xa0, 0xaf );
            break;
        case VLC_FOURCC( 'd', 't', 's', ' ' ):
            p_stream->i_stream_id = 0xbd00|StreamIdGet( p_sys->stream_id_dts, 0x88, 0x8f );
            break;
        case VLC_FOURCC( 'a', '5', '2', ' ' ):
            p_stream->i_stream_id = 0xbd00|StreamIdGet( p_sys->stream_id_a52, 0x80, 0x87 );
            break;
        case VLC_FOURCC( 'm', 'p', 'g', 'a' ):
            p_stream->i_stream_id = StreamIdGet( p_sys->stream_id_mpga, 0xc0, 0xcf );
            break;
        case VLC_FOURCC( 's', 'p', 'u', ' ' ):
            p_stream->i_stream_id = 0xbd00|StreamIdGet( p_sys->stream_id_spu, 0x20, 0x3f );
            break;
        default:
            goto error;
    }

    if( p_stream->i_stream_id < 0 )
    {
        goto error;
    }

    if( p_input->p_fmt->i_cat == AUDIO_ES )
    {
        p_sys->i_audio_bound++;
    }
    else if( p_input->p_fmt->i_cat == VIDEO_ES )
    {
        p_sys->i_video_bound++;
    }

    return VLC_SUCCESS;

error:
    free( p_stream );
    return VLC_EGENERIC;
}

/*****************************************************************************
 * DelStream:
 *****************************************************************************/
static int DelStream( sout_mux_t *p_mux, sout_input_t *p_input )
{
    sout_mux_sys_t  *p_sys = p_mux->p_sys;
    ps_stream_t *p_stream =(ps_stream_t*)p_input->p_sys;

    msg_Dbg( p_mux, "removing input" );
    switch( p_input->p_fmt->i_fourcc )
    {
        case VLC_FOURCC( 'm', 'p', 'g', 'v' ):
            StreamIdRelease( p_sys->stream_id_mpgv, 0xe0, p_stream->i_stream_id);
            break;
        case VLC_FOURCC( 'l', 'p', 'c', 'm' ):
            StreamIdRelease( p_sys->stream_id_lpcm, 0xa0, p_stream->i_stream_id&0xff );
            break;
        case VLC_FOURCC( 'd', 't', 's', ' ' ):
            StreamIdRelease( p_sys->stream_id_dts, 0x88, p_stream->i_stream_id&0xff );
            break;
        case VLC_FOURCC( 'a', '5', '2', ' ' ):
            StreamIdRelease( p_sys->stream_id_a52, 0x80, p_stream->i_stream_id&0xff );
            break;
        case VLC_FOURCC( 'm', 'p', 'g', 'a' ):
            StreamIdRelease( p_sys->stream_id_mpga, 0xc0, p_stream->i_stream_id  );
            break;
        case VLC_FOURCC( 's', 'p', 'u', ' ' ):
            StreamIdRelease( p_sys->stream_id_spu, 0x20, p_stream->i_stream_id&0xff );
            break;
        default:
            /* Never reached */
            break;
    }

    if( p_input->p_fmt->i_cat == AUDIO_ES )
    {
        p_sys->i_audio_bound--;
    }
    else if( p_input->p_fmt->i_cat == VIDEO_ES )
    {
        p_sys->i_video_bound--;
    }

    free( p_stream );
    return VLC_SUCCESS;