demux.c 31.4 KB
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/*****************************************************************************
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 * demux.c: demuxer using libavformat
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 *****************************************************************************
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 * Copyright (C) 2004-2009 the VideoLAN team
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 * $Id$
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 *
 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
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 *          Gildas Bazin <gbazin@videolan.org>
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 *
 * 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
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/

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

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#include <vlc_common.h>
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#include <vlc_demux.h>
#include <vlc_stream.h>
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#include <vlc_meta.h>
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#include <vlc_input.h>
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#include <vlc_charset.h>
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#include <vlc_avcodec.h>
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#include <libavformat/avformat.h>
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#include "../../codec/avcodec/avcodec.h"
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#include "../../codec/avcodec/chroma.h"
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#include "avformat.h"
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#include "../xiph.h"
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#include "../vobsub.h"
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/* Support for deprecated APIs */

#if LIBAVFORMAT_VERSION_MAJOR < 54
# define AVDictionaryEntry AVMetadataTag
# define av_dict_get av_metadata_get
#endif

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//#define AVFORMAT_DEBUG 1

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/* Version checking */
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#if defined(HAVE_FFMPEG_AVFORMAT_H) || defined(HAVE_LIBAVFORMAT_AVFORMAT_H)
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#if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(50<<8)+0) )
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#   define HAVE_AVUTIL_CODEC_ATTACHMENT 1
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#endif

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/*****************************************************************************
 * demux_sys_t: demux descriptor
 *****************************************************************************/
struct demux_sys_t
{
    ByteIOContext   io;
    int             io_buffer_size;
    uint8_t        *io_buffer;

    AVInputFormat  *fmt;
    AVFormatContext *ic;

    int             i_tk;
    es_out_id_t     **tk;
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    int64_t         *tk_pcr;
    int64_t         i_pcr;
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    unsigned    i_ssa_order;

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    int                i_attachments;
    input_attachment_t **attachments;
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    /* Only one title with seekpoints possible atm. */
    input_title_t *p_title;
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};

/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
static int Demux  ( demux_t *p_demux );
static int Control( demux_t *p_demux, int i_query, va_list args );

static int IORead( void *opaque, uint8_t *buf, int buf_size );
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static int64_t IOSeek( void *opaque, int64_t offset, int whence );
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static block_t *BuildSsaFrame( const AVPacket *p_pkt, unsigned i_order );
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static void UpdateSeekPoint( demux_t *p_demux, int64_t i_time );
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static void ResetTime( demux_t *p_demux, int64_t i_time );
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/*****************************************************************************
 * Open
 *****************************************************************************/
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int OpenDemux( vlc_object_t *p_this )
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{
    demux_t       *p_demux = (demux_t*)p_this;
    demux_sys_t   *p_sys;
    AVProbeData   pd;
    AVInputFormat *fmt;
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    unsigned int  i;
    int64_t       i_start_time = -1;
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    bool          b_can_seek;
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    char         *psz_url;
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    if( p_demux->psz_file )
        psz_url = strdup( p_demux->psz_file );
    else
    {
        if( asprintf( &psz_url, "%s://%s", p_demux->psz_access, p_demux->psz_location ) == -1)
            return VLC_ENOMEM;
    }
    msg_Dbg( p_demux, "trying url: %s", psz_url );
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    /* Init Probe data */
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    pd.filename = psz_url;
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    if( ( pd.buf_size = stream_Peek( p_demux->s, (const uint8_t**)&pd.buf, 2048 + 213 ) ) <= 0 )
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    {
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        free( psz_url );
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        msg_Warn( p_demux, "cannot peek" );
        return VLC_EGENERIC;
    }

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    vlc_avcodec_lock();
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    av_register_all(); /* Can be called several times */
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    vlc_avcodec_unlock();
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    /* Guess format */
    if( !( fmt = av_probe_input_format( &pd, 1 ) ) )
    {
        msg_Dbg( p_demux, "couldn't guess format" );
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        free( psz_url );
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        return VLC_EGENERIC;
    }

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    if( !p_demux->b_force )
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    {
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        static const char ppsz_blacklist[][16] = {
            /* Don't handle MPEG unless forced */
            "mpeg", "vcd", "vob", "mpegts",
            /* libavformat's redirector won't work */
            "redir", "sdp",
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            /* Don't handle subtitles format */
            "ass", "srt", "microdvd",
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            ""
        };

        for( int i = 0; *ppsz_blacklist[i]; i++ )
        {
            if( !strcmp( fmt->name, ppsz_blacklist[i] ) )
            {
                free( psz_url );
                return VLC_EGENERIC;
            }
        }
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    }

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    /* Don't trigger false alarms on bin files */
    if( !p_demux->b_force && !strcmp( fmt->name, "psxstr" ) )
    {
        int i_len;

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        if( !p_demux->psz_file )
        {
            free( psz_url );
            return VLC_EGENERIC;
        }
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        i_len = strlen( p_demux->psz_file );
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        if( i_len < 4 )
        {
            free( psz_url );
            return VLC_EGENERIC;
        }
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        if( strcasecmp( &p_demux->psz_file[i_len - 4], ".str" ) &&
            strcasecmp( &p_demux->psz_file[i_len - 4], ".xai" ) &&
            strcasecmp( &p_demux->psz_file[i_len - 3], ".xa" ) )
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        {
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            free( psz_url );
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            return VLC_EGENERIC;
        }
    }

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    msg_Dbg( p_demux, "detected format: %s", fmt->name );

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    /* Fill p_demux fields */
    p_demux->pf_demux = Demux;
    p_demux->pf_control = Control;
    p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
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    p_sys->ic = 0;
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    p_sys->fmt = fmt;
    p_sys->i_tk = 0;
    p_sys->tk = NULL;
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    p_sys->tk_pcr = NULL;
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    p_sys->i_ssa_order = 0;
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    TAB_INIT( p_sys->i_attachments, p_sys->attachments);
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    p_sys->p_title = NULL;
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    /* Create I/O wrapper */
    p_sys->io_buffer_size = 32768;  /* FIXME */
    p_sys->io_buffer = malloc( p_sys->io_buffer_size );
    init_put_byte( &p_sys->io, p_sys->io_buffer, p_sys->io_buffer_size,
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                   0, p_demux, IORead, NULL, IOSeek );
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    stream_Control( p_demux->s, STREAM_CAN_SEEK, &b_can_seek );
    if( !b_can_seek )
    {
       /* Tell avformat that input is stream, so it doesn't get stuck
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       when trying av_find_stream_info() trying to seek all the wrong places
       init_put_byte defaults io.is_streamed=0, so thats why we set them after it
       */
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       p_sys->io.is_streamed = 1;
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#if defined(AVIO_SEEKABLE_NORMAL)
       p_sys->io.seekable = 0;
#endif
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    }
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    /* Open it */
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    if( av_open_input_stream( &p_sys->ic, &p_sys->io, psz_url,
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                              p_sys->fmt, NULL ) )
    {
        msg_Err( p_demux, "av_open_input_stream failed" );
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        p_sys->ic = NULL;
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        free( psz_url );
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        CloseDemux( p_this );
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        return VLC_EGENERIC;
    }
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    free( psz_url );
    psz_url = NULL;
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    vlc_avcodec_lock(); /* avformat calls avcodec behind our back!!! */
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    if( av_find_stream_info( p_sys->ic ) < 0 )
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    {
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        msg_Warn( p_demux, "av_find_stream_info failed" );
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    }
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    vlc_avcodec_unlock();
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    for( i = 0; i < p_sys->ic->nb_streams; i++ )
    {
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        AVStream *s = p_sys->ic->streams[i];
        AVCodecContext *cc = s->codec;

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        es_out_id_t  *es;
        es_format_t  fmt;
        vlc_fourcc_t fcc;
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        const char *psz_type = "unknown";
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        if( !GetVlcFourcc( cc->codec_id, NULL, &fcc, NULL ) )
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            fcc = VLC_FOURCC( 'u', 'n', 'd', 'f' );

        switch( cc->codec_type )
        {
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        case AVMEDIA_TYPE_AUDIO:
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            es_format_Init( &fmt, AUDIO_ES, fcc );
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            fmt.i_bitrate = cc->bit_rate;
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            fmt.audio.i_channels = cc->channels;
            fmt.audio.i_rate = cc->sample_rate;
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            fmt.audio.i_bitspersample = cc->bits_per_coded_sample;
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            fmt.audio.i_blockalign = cc->block_align;
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            psz_type = "audio";
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            break;
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        case AVMEDIA_TYPE_VIDEO:
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            es_format_Init( &fmt, VIDEO_ES, fcc );
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            /* Special case for raw video data */
            if( cc->codec_id == CODEC_ID_RAWVIDEO )
            {
                msg_Dbg( p_demux, "raw video, pixel format: %i", cc->pix_fmt );
                if( GetVlcChroma( &fmt.video, cc->pix_fmt ) != VLC_SUCCESS)
                {
                    msg_Err( p_demux, "was unable to find a FourCC match for raw video" );
                }
                else
                    fmt.i_codec = fmt.video.i_chroma;
            }
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            /* We need this for the h264 packetizer */
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            else if( cc->codec_id == CODEC_ID_H264 && ( p_sys->fmt == av_find_input_format("flv") ||
                p_sys->fmt == av_find_input_format("matroska") || p_sys->fmt == av_find_input_format("mp4") ) )
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                fmt.i_original_fourcc = VLC_FOURCC( 'a', 'v', 'c', '1' );
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            fmt.video.i_width = cc->width;
            fmt.video.i_height = cc->height;
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#if LIBAVCODEC_VERSION_MAJOR < 54
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            if( cc->palctrl )
            {
                fmt.video.p_palette = malloc( sizeof(video_palette_t) );
                *fmt.video.p_palette = *(video_palette_t *)cc->palctrl;
            }
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#else
# warning FIXME: implement palette transmission
#endif
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            psz_type = "video";
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            fmt.video.i_frame_rate = cc->time_base.den;
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            fmt.video.i_frame_rate_base = cc->time_base.num * __MAX( cc->ticks_per_frame, 1 );
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            break;
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        case AVMEDIA_TYPE_SUBTITLE:
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            es_format_Init( &fmt, SPU_ES, fcc );
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            if( strncmp( p_sys->ic->iformat->name, "matroska", 8 ) == 0 &&
                cc->codec_id == CODEC_ID_DVD_SUBTITLE &&
                cc->extradata != NULL &&
                cc->extradata_size > 0 )
            {
                char *psz_start;
                char *psz_buf = malloc( cc->extradata_size + 1);
                if( psz_buf != NULL )
                {
                    memcpy( psz_buf, cc->extradata , cc->extradata_size );
                    psz_buf[cc->extradata_size] = '\0';

                    psz_start = strstr( psz_buf, "size:" );
                    if( psz_start &&
                        vobsub_size_parse( psz_start,
                                           &fmt.subs.spu.i_original_frame_width,
                                           &fmt.subs.spu.i_original_frame_height ) == VLC_SUCCESS )
                    {
                        msg_Dbg( p_demux, "original frame size: %dx%d",
                                 fmt.subs.spu.i_original_frame_width,
                                 fmt.subs.spu.i_original_frame_height );
                    }
                    else
                    {
                        msg_Warn( p_demux, "reading original frame size failed" );
                    }

                    psz_start = strstr( psz_buf, "palette:" );
                    if( psz_start &&
                        vobsub_palette_parse( psz_start, &fmt.subs.spu.palette[1] ) == VLC_SUCCESS )
                    {
                        fmt.subs.spu.palette[0] =  0xBeef;
                        msg_Dbg( p_demux, "vobsub palette read" );
                    }
                    else
                    {
                        msg_Warn( p_demux, "reading original palette failed" );
                    }
                    free( psz_buf );
                }
            }

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            psz_type = "subtitle";
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            break;
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        default:
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            es_format_Init( &fmt, UNKNOWN_ES, 0 );
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#ifdef HAVE_AVUTIL_CODEC_ATTACHMENT
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            if( cc->codec_type == AVMEDIA_TYPE_ATTACHMENT )
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            {
                input_attachment_t *p_attachment;
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                psz_type = "attachment";
                if( cc->codec_id == CODEC_ID_TTF )
                {
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                    AVDictionaryEntry *filename = av_dict_get( s->metadata, "filename", NULL, 0 );
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                    if( filename && filename->value )
                    {
                        p_attachment = vlc_input_attachment_New(
                                filename->value, "application/x-truetype-font",
                                NULL, cc->extradata, (int)cc->extradata_size );
                        TAB_APPEND( p_sys->i_attachments, p_sys->attachments,
                                p_attachment );
                    }
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                }
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                else msg_Warn( p_demux, "unsupported attachment type (%u) in avformat demux", cc->codec_id );
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            }
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            else
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#endif
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            {
                if( cc->codec_type == AVMEDIA_TYPE_DATA )
                    psz_type = "data";
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                msg_Warn( p_demux, "unsupported track type (%u:%u) in avformat demux", cc->codec_type, cc->codec_id );
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            }
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            break;
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        }
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        AVDictionaryEntry *language = av_dict_get( s->metadata, "language", NULL, 0 );
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        if ( language && language->value )
            fmt.psz_language = strdup( language->value );

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        if( s->disposition & AV_DISPOSITION_DEFAULT )
            fmt.i_priority = 1000;
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#ifdef HAVE_AVUTIL_CODEC_ATTACHMENT
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        if( cc->codec_type != AVMEDIA_TYPE_ATTACHMENT )
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#endif
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        if( cc->codec_type != AVMEDIA_TYPE_DATA )
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        {
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            const bool    b_ogg = !strcmp( p_sys->fmt->name, "ogg" );
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            const uint8_t *p_extra = cc->extradata;
            unsigned      i_extra  = cc->extradata_size;

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            if( cc->codec_id == CODEC_ID_THEORA && b_ogg )
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            {
                unsigned pi_size[3];
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                const void *pp_data[3];
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                unsigned i_count;
                for( i_count = 0; i_count < 3; i_count++ )
                {
                    if( i_extra < 2 )
                        break;
                    pi_size[i_count] = GetWBE( p_extra );
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                    pp_data[i_count] = &p_extra[2];
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                    if( i_extra < pi_size[i_count] + 2 )
                        break;

                    p_extra += 2 + pi_size[i_count];
                    i_extra -= 2 + pi_size[i_count];
                }
                if( i_count > 0 && xiph_PackHeaders( &fmt.i_extra, &fmt.p_extra,
                                                     pi_size, pp_data, i_count ) )
                {
                    fmt.i_extra = 0;
                    fmt.p_extra = NULL;
                }
            }
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            else if( cc->codec_id == CODEC_ID_SPEEX && b_ogg )
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            {
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                const uint8_t p_dummy_comment[] = {
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                    0, 0, 0, 0,
                    0, 0, 0, 0,
                };
                unsigned pi_size[2];
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                const void *pp_data[2];
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                pi_size[0] = i_extra;
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                pp_data[0] = p_extra;
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                pi_size[1] = sizeof(p_dummy_comment);
                pp_data[1] = p_dummy_comment;

                if( pi_size[0] > 0 && xiph_PackHeaders( &fmt.i_extra, &fmt.p_extra,
                                                        pi_size, pp_data, 2 ) )
                {
                    fmt.i_extra = 0;
                    fmt.p_extra = NULL;
                }
            }
            else if( cc->extradata_size > 0 )
            {
                fmt.p_extra = malloc( i_extra );
                if( fmt.p_extra )
                {
                    fmt.i_extra = i_extra;
                    memcpy( fmt.p_extra, p_extra, i_extra );
                }
            }
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            es = es_out_Add( p_demux->out, &fmt );
            if( s->disposition & AV_DISPOSITION_DEFAULT )
                es_out_Control( p_demux->out, ES_OUT_SET_ES_DEFAULT, es );
            es_format_Clean( &fmt );

            msg_Dbg( p_demux, "adding es: %s codec = %4.4s",
                     psz_type, (char*)&fcc );
            TAB_APPEND( p_sys->i_tk, p_sys->tk, es );
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        }
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    }
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    p_sys->tk_pcr = calloc( p_sys->i_tk, sizeof(*p_sys->tk_pcr) );

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    if( p_sys->ic->start_time != (int64_t)AV_NOPTS_VALUE )
        i_start_time = p_sys->ic->start_time * 1000000 / AV_TIME_BASE;
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    msg_Dbg( p_demux, "AVFormat supported stream" );
    msg_Dbg( p_demux, "    - format = %s (%s)",
             p_sys->fmt->name, p_sys->fmt->long_name );
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    msg_Dbg( p_demux, "    - start time = %"PRId64, i_start_time );
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    msg_Dbg( p_demux, "    - duration = %"PRId64,
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             ( p_sys->ic->duration != (int64_t)AV_NOPTS_VALUE ) ?
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             p_sys->ic->duration * 1000000 / AV_TIME_BASE : -1 );
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    if( p_sys->ic->nb_chapters > 0 )
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    {
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        p_sys->p_title = vlc_input_title_New();
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        p_sys->p_title->i_length = p_sys->ic->duration * 1000000 / AV_TIME_BASE;
    }

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    for( i = 0; i < p_sys->ic->nb_chapters; i++ )
    {
        seekpoint_t *s = vlc_seekpoint_New();

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        AVDictionaryEntry *title = av_dict_get( p_sys->ic->metadata, "title", NULL, 0);
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        if( title && title->value )
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        {
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            s->psz_name = strdup( title->value );
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            EnsureUTF8( s->psz_name );
            msg_Dbg( p_demux, "    - chapter %d: %s", i, s->psz_name );
        }
        s->i_time_offset = p_sys->ic->chapters[i]->start * 1000000 *
            p_sys->ic->chapters[i]->time_base.num /
            p_sys->ic->chapters[i]->time_base.den -
            (i_start_time != -1 ? i_start_time : 0 );
        TAB_APPEND( p_sys->p_title->i_seekpoint, p_sys->p_title->seekpoint, s );
    }

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    ResetTime( p_demux, 0 );
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    return VLC_SUCCESS;
}

/*****************************************************************************
 * Close
 *****************************************************************************/
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void CloseDemux( vlc_object_t *p_this )
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{
    demux_t     *p_demux = (demux_t*)p_this;
    demux_sys_t *p_sys = p_demux->p_sys;

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    FREENULL( p_sys->tk );
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    free( p_sys->tk_pcr );
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    if( p_sys->ic ) av_close_input_stream( p_sys->ic );
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    for( int i = 0; i < p_sys->i_attachments; i++ )
        free( p_sys->attachments[i] );
    TAB_CLEAN( p_sys->i_attachments, p_sys->attachments);

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    if( p_sys->p_title )
        vlc_input_title_Delete( p_sys->p_title );

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

/*****************************************************************************
 * Demux:
 *****************************************************************************/
static int Demux( demux_t *p_demux )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    AVPacket    pkt;
    block_t     *p_frame;
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    int64_t     i_start_time;
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    /* Read a frame */
    if( av_read_frame( p_sys->ic, &pkt ) )
    {
        return 0;
    }
    if( pkt.stream_index < 0 || pkt.stream_index >= p_sys->i_tk )
    {
        av_free_packet( &pkt );
        return 1;
    }
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    const AVStream *p_stream = p_sys->ic->streams[pkt.stream_index];
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    if( p_stream->time_base.den <= 0 )
    {
        msg_Warn( p_demux, "Invalid time base for the stream %d", pkt.stream_index );
        av_free_packet( &pkt );
        return 1;
    }
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    if( p_stream->codec->codec_id == CODEC_ID_SSA )
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    {
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        p_frame = BuildSsaFrame( &pkt, p_sys->i_ssa_order++ );
        if( !p_frame )
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        {
            av_free_packet( &pkt );
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            return 1;
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        }
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    }
    else
    {
        if( ( p_frame = block_New( p_demux, pkt.size ) ) == NULL )
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        {
            av_free_packet( &pkt );
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            return 0;
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        }
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        memcpy( p_frame->p_buffer, pkt.data, pkt.size );
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    }
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    if( pkt.flags & AV_PKT_FLAG_KEY )
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        p_frame->i_flags |= BLOCK_FLAG_TYPE_I;

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    i_start_time = ( p_sys->ic->start_time != (int64_t)AV_NOPTS_VALUE ) ?
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        ( p_sys->ic->start_time * 1000000 / AV_TIME_BASE )  : 0;
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    p_frame->i_dts = ( pkt.dts == (int64_t)AV_NOPTS_VALUE ) ?
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        VLC_TS_INVALID : (pkt.dts) * 1000000 *
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        p_stream->time_base.num /
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        p_stream->time_base.den - i_start_time + VLC_TS_0;
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    p_frame->i_pts = ( pkt.pts == (int64_t)AV_NOPTS_VALUE ) ?
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        VLC_TS_INVALID : (pkt.pts) * 1000000 *
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        p_stream->time_base.num /
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        p_stream->time_base.den - i_start_time + VLC_TS_0;
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    if( pkt.duration > 0 && p_frame->i_length <= 0 )
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        p_frame->i_length = pkt.duration * 1000000 *
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            p_stream->time_base.num /
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            p_stream->time_base.den;
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    if( pkt.dts != AV_NOPTS_VALUE && pkt.dts == pkt.pts &&
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        p_stream->codec->codec_type == AVMEDIA_TYPE_VIDEO )
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    {
        /* Add here notoriously bugged file formats/samples regarding PTS */
        if( !strcmp( p_sys->fmt->name, "flv" ) )
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            p_frame->i_pts = VLC_TS_INVALID;
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    }
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#ifdef AVFORMAT_DEBUG
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    msg_Dbg( p_demux, "tk[%d] dts=%"PRId64" pts=%"PRId64,
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             pkt.stream_index, p_frame->i_dts, p_frame->i_pts );
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#endif
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    if( p_frame->i_dts > VLC_TS_INVALID )
        p_sys->tk_pcr[pkt.stream_index] = p_frame->i_dts;
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    int64_t i_ts_max = INT64_MIN;
    for( int i = 0; i < p_sys->i_tk; i++ )
        i_ts_max = __MAX( i_ts_max, p_sys->tk_pcr[i] );
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    int64_t i_ts_min = INT64_MAX;
    for( int i = 0; i < p_sys->i_tk; i++ )
    {
        if( p_sys->tk_pcr[i] > VLC_TS_INVALID && p_sys->tk_pcr[i] + 10 * CLOCK_FREQ >= i_ts_max )
            i_ts_min = __MIN( i_ts_min, p_sys->tk_pcr[i] );
    }
    if( i_ts_min >= p_sys->i_pcr )
    {
        p_sys->i_pcr = i_ts_min;
        es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_pcr );
        UpdateSeekPoint( p_demux, p_sys->i_pcr );
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    }

    es_out_Send( p_demux->out, p_sys->tk[pkt.stream_index], p_frame );
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    av_free_packet( &pkt );
    return 1;
}

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static void UpdateSeekPoint( demux_t *p_demux, int64_t i_time )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    int i;

    if( !p_sys->p_title )
        return;

    for( i = 0; i < p_sys->p_title->i_seekpoint; i++ )
    {
        if( i_time < p_sys->p_title->seekpoint[i]->i_time_offset )
            break;
    }
    i--;

    if( i != p_demux->info.i_seekpoint && i >= 0 )
    {
        p_demux->info.i_seekpoint = i;
        p_demux->info.i_update |= INPUT_UPDATE_SEEKPOINT;
    }
}

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static void ResetTime( demux_t *p_demux, int64_t i_time )
{
    demux_sys_t *p_sys = p_demux->p_sys;

    if( p_sys->ic->start_time == (int64_t)AV_NOPTS_VALUE || i_time < 0 )
        i_time = VLC_TS_INVALID;
    else if( i_time == 0 )
        i_time = 1;

    p_sys->i_pcr = i_time;
    for( int i = 0; i < p_sys->i_tk; i++ )
        p_sys->tk_pcr[i] = i_time;

    if( i_time > VLC_TS_INVALID )
    {
        es_out_Control( p_demux->out, ES_OUT_SET_NEXT_DISPLAY_TIME, i_time );
        UpdateSeekPoint( p_demux, i_time );
    }
}

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static block_t *BuildSsaFrame( const AVPacket *p_pkt, unsigned i_order )
{
    if( p_pkt->size <= 0 )
        return NULL;

    char buffer[256];
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    const size_t i_buffer_size = __MIN( (int)sizeof(buffer) - 1, p_pkt->size );
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    memcpy( buffer, p_pkt->data, i_buffer_size );
    buffer[i_buffer_size] = '\0';

    /* */
    int i_layer;
    int h0, m0, s0, c0;
    int h1, m1, s1, c1;
    int i_position = 0;
    if( sscanf( buffer, "Dialogue: %d,%d:%d:%d.%d,%d:%d:%d.%d,%n", &i_layer,
                &h0, &m0, &s0, &c0, &h1, &m1, &s1, &c1, &i_position ) < 9 )
        return NULL;
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    if( i_position <= 0 || (unsigned)i_position >= i_buffer_size )
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        return NULL;

    char *p;
    if( asprintf( &p, "%u,%d,%.*s", i_order, i_layer, p_pkt->size - i_position, p_pkt->data + i_position ) < 0 )
        return NULL;

    block_t *p_frame = block_heap_Alloc( p, p, strlen(p) + 1 );
    if( p_frame )
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        p_frame->i_length = CLOCK_FREQ * ((h1-h0) * 3600 +
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                                          (m1-m0) * 60 +
                                          (s1-s0) * 1) +
                            CLOCK_FREQ * (c1-c0) / 100;
    return p_frame;
}

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/*****************************************************************************
 * Control:
 *****************************************************************************/
static int Control( demux_t *p_demux, int i_query, va_list args )
{
    demux_sys_t *p_sys = p_demux->p_sys;
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    const int64_t i_start_time = p_sys->ic->start_time != (int64_t)AV_NOPTS_VALUE ? p_sys->ic->start_time : 0;
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    double f, *pf;
    int64_t i64, *pi64;

    switch( i_query )
    {
        case DEMUX_GET_POSITION:
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            pf = (double*) va_arg( args, double* ); *pf = 0.0;
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            i64 = stream_Size( p_demux->s );
            if( i64 > 0 )
            {
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                double current = stream_Tell( p_demux->s );
                *pf = current / (double)i64;
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            }
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            if( (p_sys->ic->duration != (int64_t)AV_NOPTS_VALUE) && (p_sys->i_pcr > 0) )
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            {
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                *pf = (double)p_sys->i_pcr / (double)p_sys->ic->duration;
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            }
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            return VLC_SUCCESS;

        case DEMUX_SET_POSITION:
            f = (double) va_arg( args, double );
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            i64 = p_sys->ic->duration * f + i_start_time;
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            msg_Warn( p_demux, "DEMUX_SET_POSITION: %"PRId64, i64 );
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            /* If we have a duration, we prefer to seek by time
               but if we don't, or if the seek fails, try BYTE seeking */
            if( p_sys->ic->duration == (int64_t)AV_NOPTS_VALUE ||
                (av_seek_frame( p_sys->ic, -1, i64, AVSEEK_FLAG_BACKWARD ) < 0) )
            {
                int64_t i_size = stream_Size( p_demux->s );
                i64 = (i_size * f);
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                msg_Warn( p_demux, "DEMUX_SET_BYTE_POSITION: %"PRId64, i64 );
                if( av_seek_frame( p_sys->ic, -1, i64, AVSEEK_FLAG_BYTE ) < 0 )
                    return VLC_EGENERIC;

                ResetTime( p_demux, -1 );
            }
            else
            {
                ResetTime( p_demux, i64 - i_start_time );
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            }
            return VLC_SUCCESS;

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        case DEMUX_GET_LENGTH:
            pi64 = (int64_t*)va_arg( args, int64_t * );
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            if( p_sys->ic->duration != (int64_t)AV_NOPTS_VALUE )
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                *pi64 = p_sys->ic->duration * 1000000 / AV_TIME_BASE;
            else
                *pi64 = 0;
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            return VLC_SUCCESS;

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        case DEMUX_GET_TIME:
            pi64 = (int64_t*)va_arg( args, int64_t * );
            *pi64 = p_sys->i_pcr;
            return VLC_SUCCESS;

        case DEMUX_SET_TIME:
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        {
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            i64 = (int64_t)va_arg( args, int64_t );
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            i64 = i64 *AV_TIME_BASE / 1000000 + i_start_time;
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            msg_Warn( p_demux, "DEMUX_SET_TIME: %"PRId64, i64 );
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            if( av_seek_frame( p_sys->ic, -1, i64, AVSEEK_FLAG_BACKWARD ) < 0 )
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            {
                return VLC_EGENERIC;
            }
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            ResetTime( p_demux, i64 - i_start_time );
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            return VLC_SUCCESS;
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        }
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        case DEMUX_HAS_UNSUPPORTED_META:
        {
            bool *pb_bool = (bool*)va_arg( args, bool* );
            *pb_bool = true;
            return VLC_SUCCESS;
        }


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        case DEMUX_GET_META:
        {
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            vlc_meta_t *p_meta = (vlc_meta_t*)va_arg( args, vlc_meta_t* );
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            AVDictionaryEntry *title = av_dict_get( p_sys->ic->metadata, "language", NULL, 0 );
            AVDictionaryEntry *artist = av_dict_get( p_sys->ic->metadata, "artist", NULL, 0 );
            AVDictionaryEntry *copyright = av_dict_get( p_sys->ic->metadata, "copyright", NULL, 0 );
            AVDictionaryEntry *comment = av_dict_get( p_sys->ic->metadata, "comment", NULL, 0 );
            AVDictionaryEntry *genre = av_dict_get( p_sys->ic->metadata, "genre", NULL, 0 );
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            if( title && title->value )
                vlc_meta_SetTitle( p_meta, title->value );
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            if( artist && artist->value )
                vlc_meta_SetArtist( p_meta, artist->value );
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            if( copyright && copyright->value )
                vlc_meta_SetCopyright( p_meta, copyright->value );
            if( comment && comment->value )
                vlc_meta_SetDescription( p_meta, comment->value );
            if( genre && genre->value )
                vlc_meta_SetGenre( p_meta, genre->value );
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            return VLC_SUCCESS;
        }

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        case DEMUX_GET_ATTACHMENTS:
        {
            input_attachment_t ***ppp_attach =
                (input_attachment_t***)va_arg( args, input_attachment_t*** );
            int *pi_int = (int*)va_arg( args, int * );
            int i;

            if( p_sys->i_attachments <= 0 )
                return VLC_EGENERIC;

            *pi_int = p_sys->i_attachments;;
            *ppp_attach = malloc( sizeof(input_attachment_t**) * p_sys->i_attachments );
            for( i = 0; i < p_sys->i_attachments; i++ )
                (*ppp_attach)[i] = vlc_input_attachment_Duplicate( p_sys->attachments[i] );
            return VLC_SUCCESS;
        }

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        case DEMUX_GET_TITLE_INFO:
        {
            input_title_t ***ppp_title = (input_title_t***)va_arg( args, input_title_t*** );
            int *pi_int    = (int*)va_arg( args, int* );
            int *pi_title_offset = (int*)va_arg( args, int* );
            int *pi_seekpoint_offset = (int*)va_arg( args, int* );

            if( !p_sys->p_title )
                return VLC_EGENERIC;

            *pi_int = 1;
            *ppp_title = malloc( sizeof( input_title_t**) );
            (*ppp_title)[0] = vlc_input_title_Duplicate( p_sys->p_title );
            *pi_title_offset = 0;
            *pi_seekpoint_offset = 0;
            return VLC_SUCCESS;
        }
        case DEMUX_SET_TITLE:
        {
            const int i_title = (int)va_arg( args, int );
            if( !p_sys->p_title || i_title != 0 )
                return VLC_EGENERIC;
            return VLC_SUCCESS;
        }
        case DEMUX_SET_SEEKPOINT:
        {
            const int i_seekpoint = (int)va_arg( args, int );
            if( !p_sys->p_title )
                return VLC_EGENERIC;

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            i64 = p_sys->p_title->seekpoint[i_seekpoint]->i_time_offset *
                  AV_TIME_BASE / 1000000 + i_start_time;
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            msg_Warn( p_demux, "DEMUX_SET_TIME: %"PRId64, i64 );

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            if( av_seek_frame( p_sys->ic, -1, i64, AVSEEK_FLAG_BACKWARD ) < 0 )
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            {
                return VLC_EGENERIC;
            }
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            ResetTime( p_demux, i64 - i_start_time );
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            return VLC_SUCCESS;
        }


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        default:
            return VLC_EGENERIC;
    }
}

/*****************************************************************************
 * I/O wrappers for libavformat
 *****************************************************************************/
static int IORead( void *opaque, uint8_t *buf, int buf_size )
{
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    demux_t *p_demux = opaque;
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    if( buf_size < 0 ) return -1;
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    int i_ret = stream_Read( p_demux->s, buf, buf_size );
    return i_ret ? i_ret : -1;
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}

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static int64_t IOSeek( void *opaque, int64_t offset, int whence )
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{
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    demux_t *p_demux = opaque;
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    int64_t i_absolute;
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    int64_t i_size = stream_Size( p_demux->s );
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#ifdef AVFORMAT_DEBUG
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    msg_Warn( p_demux, "IOSeek offset: %"PRId64", whence: %i", offset, whence );
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#endif
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    switch( whence )
    {
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#ifdef AVSEEK_SIZE
        case AVSEEK_SIZE:
            return i_size;
#endif
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        case SEEK_SET:
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            i_absolute = (int64_t)offset;
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            break;
        case SEEK_CUR:
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            i_absolute = stream_Tell( p_demux->s ) + (int64_t)offset;
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            break;
        case SEEK_END:
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            i_absolute = i_size + (int64_t)offset;
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            break;
        default:
            return -1;

    }
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    if( i_absolute < 0 )
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    {
        msg_Dbg( p_demux, "Trying to seek before the beginning" );
        return -1;
    }
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    if( i_size > 0 && i_absolute >= i_size )
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    {
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        msg_Dbg( p_demux, "Trying to seek too far : EOF?" );
        return -1;
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    }
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    if( stream_Seek( p_demux->s, i_absolute ) )
    {
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        msg_Warn( p_demux, "we were not allowed to seek, or EOF " );
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        return -1;
    }

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    return stream_Tell( p_demux->s );
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}

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#endif /* HAVE_LIBAVFORMAT_AVFORMAT_H */