mux.c

VLC Player Source Code

/*****************************************************************************
 * mux.c: muxer using ffmpeg (libavformat).
 *****************************************************************************
 * Copyright (C) 2006 the VideoLAN team
 * $Id$
 *
 * Authors: 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
 *****************************************************************************/

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <vlc_common.h>
#include <vlc_block.h>
#include <vlc_sout.h>

/* ffmpeg header */
#ifdef HAVE_LIBAVFORMAT_AVFORMAT_H
#   include <libavformat/avformat.h>
#elif defined(HAVE_FFMPEG_AVFORMAT_H)
#   include <ffmpeg/avformat.h>
#endif

#include "avformat.h"
#include "../../codec/avcodec/fourcc.h"
#include "../../codec/avcodec/avutil.h"

//#define AVFORMAT_DEBUG 1

static const char *const ppsz_mux_options[] = {
    "mux", NULL
};

/*****************************************************************************
 * mux_sys_t: mux descriptor
 *****************************************************************************/
struct sout_mux_sys_t
{
    ByteIOContext   io;
    int             io_buffer_size;
    uint8_t        *io_buffer;

    AVFormatContext *oc;
    URLContext     url;
    URLProtocol    prot;

    bool     b_write_header;
    bool     b_error;

    int64_t        i_initial_dts;
};

/*****************************************************************************
 * Local 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 IOWrite( void *opaque, uint8_t *buf, int buf_size );
static offset_t IOSeek( void *opaque, offset_t offset, int whence );

/*****************************************************************************
 * Open
 *****************************************************************************/
int OpenMux( vlc_object_t *p_this )
{
    AVOutputFormat *file_oformat;
    sout_mux_t *p_mux = (sout_mux_t*)p_this;
    sout_mux_sys_t *p_sys;
    AVFormatParameters params, *ap = &params;
    char *psz_mux;

    /* Should we call it only once ? */
    av_register_all();
    av_log_set_callback( LibavutilCallback );

    config_ChainParse( p_mux, "ffmpeg-", ppsz_mux_options, p_mux->p_cfg );

    /* Find the requested muxer */
    psz_mux = var_GetNonEmptyString( p_mux, "ffmpeg-mux" );
    if( psz_mux )
    {
        file_oformat = guess_format( psz_mux, NULL, NULL );
    }
    else
    {
        file_oformat =
            guess_format(NULL, p_mux->p_access->psz_path, NULL);
    }
    if (!file_oformat)
    {
      msg_Err( p_mux, "unable for find a suitable output format" );
      return VLC_EGENERIC;
    }

    /* Fill p_mux fields */
    p_mux->pf_control   = Control;
    p_mux->pf_addstream = AddStream;
    p_mux->pf_delstream = DelStream;
    p_mux->pf_mux       = Mux;
    p_mux->p_sys = p_sys = malloc( sizeof( sout_mux_sys_t ) );

    p_sys->oc = av_alloc_format_context();
    p_sys->oc->oformat = file_oformat;

    /* Create I/O wrapper */
    p_sys->io_buffer_size = 32768;  /* FIXME */
    p_sys->io_buffer = malloc( p_sys->io_buffer_size );
    p_sys->url.priv_data = p_mux;
    p_sys->url.prot = &p_sys->prot;
    p_sys->url.prot->name = "VLC I/O wrapper";
    p_sys->url.prot->url_open = 0;
    p_sys->url.prot->url_read = 0;
    p_sys->url.prot->url_write =
                    (int (*) (URLContext *, unsigned char *, int))IOWrite;
    p_sys->url.prot->url_seek =
                    (offset_t (*) (URLContext *, offset_t, int))IOSeek;
    p_sys->url.prot->url_close = 0;
    p_sys->url.prot->next = 0;
    init_put_byte( &p_sys->io, p_sys->io_buffer, p_sys->io_buffer_size,
                   1, &p_sys->url, NULL, IOWrite, IOSeek );

    memset( ap, 0, sizeof(*ap) );
    if( av_set_parameters( p_sys->oc, ap ) < 0 )
    {
        msg_Err( p_mux, "invalid encoding parameters" );
        av_free( p_sys->oc );
        free( p_sys->io_buffer );
        free( p_sys );
        return VLC_EGENERIC;
    }

#if LIBAVFORMAT_VERSION_INT >= ((52<<16)+(0<<8)+0)
    p_sys->oc->pb = &p_sys->io;
#else
    p_sys->oc->pb = p_sys->io;
#endif
    p_sys->oc->nb_streams = 0;

    p_sys->b_write_header = true;
    p_sys->b_error = false;
    p_sys->i_initial_dts = 0;

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Close
 *****************************************************************************/
void CloseMux( 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;
    unsigned int i;

    if( av_write_trailer( p_sys->oc ) < 0 )
    {
        msg_Err( p_mux, "could not write trailer" );
    }

    for( i = 0 ; i < p_sys->oc->nb_streams; i++ )
    {
        if( p_sys->oc->streams[i]->codec->extradata )
            av_free( p_sys->oc->streams[i]->codec->extradata );
        av_free( p_sys->oc->streams[i]->codec );
        av_free( p_sys->oc->streams[i] );
    }
    av_free( p_sys->oc );

    free( p_sys->io_buffer );
    free( p_sys );
}

/*****************************************************************************
 * AddStream
 *****************************************************************************/
static int AddStream( sout_mux_t *p_mux, sout_input_t *p_input )
{
    sout_mux_sys_t *p_sys = p_mux->p_sys;
    AVCodecContext *codec;
    AVStream *stream;
    int i_codec_id, i_aspect_num, i_aspect_den;

    msg_Dbg( p_mux, "adding input" );

    if( !GetFfmpegCodec( p_input->p_fmt->i_codec, 0, &i_codec_id, 0 ) )
    {
        msg_Dbg( p_mux, "couldn't find codec for fourcc '%4.4s'",
                 (char *)&p_input->p_fmt->i_codec );
        return VLC_EGENERIC;
    }

    p_input->p_sys = malloc( sizeof( int ) );
    *((int *)p_input->p_sys) = p_sys->oc->nb_streams;

    stream = av_new_stream( p_sys->oc, p_sys->oc->nb_streams);
    if( !stream )
    {
        free( p_input->p_sys );
        return VLC_EGENERIC;
    }
    codec = stream->codec;

    /* This is used by LibavutilCallback (avutil.h) to print messages */
    codec->opaque = (void*)p_mux;

    switch( p_input->p_fmt->i_cat )
    {
    case AUDIO_ES:
        codec->codec_type = CODEC_TYPE_AUDIO;
        codec->channels = p_input->p_fmt->audio.i_channels;
        codec->sample_rate = p_input->p_fmt->audio.i_rate;
        codec->time_base = (AVRational){1, codec->sample_rate};
        break;

    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;
        }
        codec->codec_type = CODEC_TYPE_VIDEO;
        codec->width = p_input->p_fmt->video.i_width;
        codec->height = p_input->p_fmt->video.i_height;
        av_reduce( &i_aspect_num, &i_aspect_den,
                   p_input->p_fmt->video.i_aspect,
                   VOUT_ASPECT_FACTOR, 1 << 30 /* something big */ );
        av_reduce( &codec->sample_aspect_ratio.num,
                   &codec->sample_aspect_ratio.den,
                   i_aspect_num * (int64_t)codec->height,