ogg.c

uclinux 下的vlc播放器源代码

/*****************************************************************************
 * ogg.c: ogg muxer module for vlc
 *****************************************************************************
 * Copyright (C) 2001, 2002, 2006 the VideoLAN team
 * $Id: ogg.c 14918 2006-03-25 12:54:27Z fkuehne $
 *
 * Authors: Laurent Aimar <[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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include <stdlib.h>
#include <string.h>

#ifdef HAVE_TIME_H
#   include <time.h>
#endif

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

#include "codecs.h"

#include <ogg/ogg.h>

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

vlc_module_begin();
    set_description( _("Ogg/OGM muxer") );
    set_capability( "sout mux", 10 );
    set_category( CAT_SOUT );
    set_subcategory( SUBCAT_SOUT_MUX );
    add_shortcut( "ogg" );
    add_shortcut( "ogm" );
    set_callbacks( Open, Close );
vlc_module_end();


/*****************************************************************************
 * Exported prototypes
 *****************************************************************************/
static int Control  ( sout_mux_t *, int, va_list );
static int AddStream( sout_mux_t *, sout_input_t * );
static int DelStream( sout_mux_t *, sout_input_t * );
static int Mux      ( sout_mux_t * );
static int MuxBlock ( sout_mux_t *, sout_input_t * );

static block_t *OggCreateHeader( sout_mux_t *, mtime_t );
static block_t *OggCreateFooter( sout_mux_t *, mtime_t );

/*****************************************************************************
 * Misc declarations
 *****************************************************************************/
#define FREE( p ) if( p ) { free( p ); (p) = NULL; }

/* Structures used for OggDS headers used in ogm files */

#define PACKET_TYPE_HEADER   0x01
#define PACKET_TYPE_COMMENT  0x03
#define PACKET_IS_SYNCPOINT  0x08

typedef struct
#ifdef HAVE_ATTRIBUTE_PACKED
    __attribute__((__packed__))
#endif
{
    int32_t i_width;
    int32_t i_height;
} oggds_header_video_t;

typedef struct
#ifdef HAVE_ATTRIBUTE_PACKED
    __attribute__((__packed__))
#endif
{
    int16_t i_channels;
    int16_t i_block_align;
    int32_t i_avgbytespersec;
} oggds_header_audio_t;

typedef struct
#ifdef HAVE_ATTRIBUTE_PACKED
    __attribute__((__packed__))
#endif
{
    uint8_t i_packet_type;

    char stream_type[8];
    char sub_type[4];

    int32_t i_size;

    int64_t i_time_unit;
    int64_t i_samples_per_unit;
    int32_t i_default_len;

    int32_t i_buffer_size;
    int16_t i_bits_per_sample;

    int16_t i_padding_0; /* Because the original is using MSVC packing style */

    union
    {
        oggds_header_video_t video;
        oggds_header_audio_t audio;
    } header;

    int32_t i_padding_1; /* Because the original is using MSVC packing style */

} oggds_header_t;

/*
 * TODO  move this function to src/stream_output.c (used by nearly all muxers)
 */
static int MuxGetStream( sout_mux_t *p_mux, int *pi_stream, mtime_t *pi_dts )
{
    mtime_t i_dts;
    int     i_stream;
    int     i;

    for( i = 0, i_dts = 0, i_stream = -1; i < p_mux->i_nb_inputs; i++ )
    {
        block_fifo_t  *p_fifo;

        p_fifo = p_mux->pp_inputs[i]->p_fifo;

        /* We don't really need to have anything in the SPU fifo */
        if( p_mux->pp_inputs[i]->p_fmt->i_cat == SPU_ES &&
            p_fifo->i_depth == 0 ) continue;

        if( p_fifo->i_depth )
        {
            block_t *p_buf;

            p_buf = block_FifoShow( p_fifo );
            if( i_stream < 0 || p_buf->i_dts < i_dts )
            {
                i_dts = p_buf->i_dts;
                i_stream = i;
            }
        }
        else return -1;

    }
    if( pi_stream ) *pi_stream = i_stream;
    if( pi_dts ) *pi_dts = i_dts;
    return i_stream;
}

/*****************************************************************************
 * Definitions of structures and functions used by this plugins 
 *****************************************************************************/
typedef struct
{
    int i_cat;
    int i_fourcc;

    int b_new;

    mtime_t i_dts;
    mtime_t i_length;
    int     i_packet_no;
    int     i_serial_no;
    int     i_keyframe_granule_shift; /* Theora only */
    ogg_stream_state os;

    oggds_header_t *p_oggds_header;

} ogg_stream_t;

struct sout_mux_sys_t
{
    int     i_streams;

    mtime_t i_start_dts;
    int     i_next_serial_no;

    /* number of logical streams pending to be added */
    int i_add_streams;

    /* logical streams pending to be deleted */
    int i_del_streams;
    ogg_stream_t **pp_del_streams;
};

static void OggSetDate( block_t *, mtime_t , mtime_t  );
static block_t *OggStreamFlush( sout_mux_t *, ogg_stream_state *, mtime_t );

/*****************************************************************************
 * Open: Open muxer
 *****************************************************************************/
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_sys                 = malloc( sizeof( sout_mux_sys_t ) );
    p_sys->i_streams      = 0;
    p_sys->i_add_streams  = 0;
    p_sys->i_del_streams  = 0;
    p_sys->pp_del_streams = 0;

    p_mux->p_sys        = p_sys;
    p_mux->pf_control   = Control;
    p_mux->pf_addstream = AddStream;
    p_mux->pf_delstream = DelStream;
    p_mux->pf_mux       = Mux;

    /* First serial number is random.
     * (Done like this because on win32 you need to seed the random number
     *  generator once per thread). */
    srand( (unsigned int)time( NULL ) );
    p_sys->i_next_serial_no = rand();

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Close: Finalize ogg bitstream and close muxer
 *****************************************************************************/
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;

    msg_Info( p_mux, "Close" );

    if( p_sys->i_del_streams )
    {
        block_t *p_og = NULL;
        mtime_t i_dts = -1;
        int i;

        /* Close the current ogg stream */
        msg_Dbg( p_mux, "writing footer" );
        block_ChainAppend( &p_og, OggCreateFooter( p_mux, 0 ) );

        /* Remove deleted logical streams */
        for( i = 0; i < p_sys->i_del_streams; i++ )
        {
            i_dts = p_sys->pp_del_streams[i]->i_dts;
            ogg_stream_clear( &p_sys->pp_del_streams[i]->os );
            FREE( p_sys->pp_del_streams[i]->p_oggds_header );
            FREE( p_sys->pp_del_streams[i] );
        }
        FREE( p_sys->pp_del_streams );
        p_sys->i_streams -= p_sys->i_del_streams;

        /* Write footer */
        OggSetDate( p_og, i_dts, 0 );
        sout_AccessOutWrite( p_mux->p_access, p_og );
    }

    free( p_sys );
}

/*****************************************************************************
 * Control:
 *****************************************************************************/
static int Control( sout_mux_t *p_mux, int i_query, va_list args )
{
    vlc_bool_t *pb_bool;
    char **ppsz;

   switch( i_query )
   {
       case MUX_CAN_ADD_STREAM_WHILE_MUXING:
           pb_bool = (vlc_bool_t*)va_arg( args, vlc_bool_t * );
           *pb_bool = VLC_TRUE;
           return VLC_SUCCESS;

       case MUX_GET_ADD_STREAM_WAIT:
           pb_bool = (vlc_bool_t*)va_arg( args, vlc_bool_t * );
           *pb_bool = VLC_TRUE;
           return VLC_SUCCESS;

       case MUX_GET_MIME:
           ppsz = (char**)va_arg( args, char ** );
           *ppsz = strdup( "application/ogg" );
           return VLC_SUCCESS;

        default:
            return VLC_EGENERIC;
   }
}
/*****************************************************************************
 * AddStream: Add an elementary stream to the muxed stream
 *****************************************************************************/
static int AddStream( sout_mux_t *p_mux, sout_input_t *p_input )
{
    sout_mux_sys_t *p_sys = p_mux->p_sys;
    ogg_stream_t   *p_stream;
    uint16_t i_tag;

    msg_Dbg( p_mux, "adding input" );

    p_input->p_sys = p_stream = malloc( sizeof( ogg_stream_t ) );

    p_stream->i_cat       = p_input->p_fmt->i_cat;
    p_stream->i_fourcc    = p_input->p_fmt->i_codec;
    p_stream->i_serial_no = p_sys->i_next_serial_no++;
    p_stream->i_packet_no = 0;

    p_stream->p_oggds_header = 0;

    switch( p_input->p_fmt->i_cat )
    {
    case VIDEO_ES:
        if( !p_input->p_fmt->video.i_frame_rate ||
            !p_input->p_fmt->video.i_frame_rate_base )
        {
            msg_Warn( p_mux, "Missing frame rate, assuming 25fps" );
            p_input->p_fmt->video.i_frame_rate = 25;
            p_input->p_fmt->video.i_frame_rate_base = 1;
        }