transcode.c

来自「uclinux 下的vlc播放器源代码」· C语言 代码 · 共 1,822 行 · 第 1/5 页

        }
    }

    /* Audio settings */
    var_Get( p_stream, SOUT_CFG_PREFIX "audio-sync", &val );
    p_sys->b_master_sync = val.b_bool;
    if( p_sys->f_fps > 0 ) p_sys->b_master_sync = VLC_TRUE;

    p_stream->pf_add    = Add;
    p_stream->pf_del    = Del;
    p_stream->pf_send   = Send;
    p_stream->p_sys     = p_sys;

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Close:
 *****************************************************************************/
static void Close( vlc_object_t * p_this )
{
    sout_stream_t       *p_stream = (sout_stream_t*)p_this;
    sout_stream_sys_t   *p_sys = p_stream->p_sys;

    sout_StreamDelete( p_sys->p_out );

    while( p_sys->p_audio_cfg != NULL )
    {
        sout_cfg_t *p_next = p_sys->p_audio_cfg->p_next;

        if( p_sys->p_audio_cfg->psz_name )
            free( p_sys->p_audio_cfg->psz_name );
        if( p_sys->p_audio_cfg->psz_value )
            free( p_sys->p_audio_cfg->psz_value );
        free( p_sys->p_audio_cfg );

        p_sys->p_audio_cfg = p_next;
    }
    if( p_sys->psz_aenc ) free( p_sys->psz_aenc );

    while( p_sys->p_video_cfg != NULL )
    {
        sout_cfg_t *p_next = p_sys->p_video_cfg->p_next;

        if( p_sys->p_video_cfg->psz_name )
            free( p_sys->p_video_cfg->psz_name );
        if( p_sys->p_video_cfg->psz_value )
            free( p_sys->p_video_cfg->psz_value );
        free( p_sys->p_video_cfg );

        p_sys->p_video_cfg = p_next;
    }
    if( p_sys->psz_venc ) free( p_sys->psz_venc );

    while( p_sys->p_deinterlace_cfg != NULL )
    {
        sout_cfg_t *p_next = p_sys->p_deinterlace_cfg->p_next;

        if( p_sys->p_deinterlace_cfg->psz_name )
            free( p_sys->p_deinterlace_cfg->psz_name );
        if( p_sys->p_deinterlace_cfg->psz_value )
            free( p_sys->p_deinterlace_cfg->psz_value );
        free( p_sys->p_deinterlace_cfg );

        p_sys->p_deinterlace_cfg = p_next;
    }
    if( p_sys->psz_deinterlace ) free( p_sys->psz_deinterlace );

    while( p_sys->p_spu_cfg != NULL )
    {
        sout_cfg_t *p_next = p_sys->p_spu_cfg->p_next;

        if( p_sys->p_spu_cfg->psz_name )
            free( p_sys->p_spu_cfg->psz_name );
        if( p_sys->p_spu_cfg->psz_value )
            free( p_sys->p_spu_cfg->psz_value );
        free( p_sys->p_spu_cfg );

        p_sys->p_spu_cfg = p_next;
    }
    if( p_sys->psz_senc ) free( p_sys->psz_senc );

    if( p_sys->p_spu ) spu_Destroy( p_sys->p_spu );

    while( p_sys->p_osd_cfg != NULL )
    {
        sout_cfg_t *p_next = p_sys->p_osd_cfg->p_next;

        if( p_sys->p_osd_cfg->psz_name )
            free( p_sys->p_osd_cfg->psz_name );
        if( p_sys->p_osd_cfg->psz_value )
            free( p_sys->p_osd_cfg->psz_value );
        free( p_sys->p_osd_cfg );

        p_sys->p_osd_cfg = p_next;
    }
    if( p_sys->psz_osdenc ) free( p_sys->psz_osdenc );

    vlc_object_destroy( p_sys );
}

struct sout_stream_id_t
{
    vlc_fourcc_t  b_transcode;

    /* id of the out stream */
    void *id;

    /* Decoder */
    decoder_t       *p_decoder;

    /* Filters */
    filter_t        *pp_filter[10];
    int             i_filter;
    filter_t        *pp_vfilter[10];
    int             i_vfilter;

    /* Encoder */
    encoder_t       *p_encoder;

    /* Sync */
    date_t          interpolated_pts;
};

static sout_stream_id_t *Add( sout_stream_t *p_stream, es_format_t *p_fmt )
{
    sout_stream_sys_t *p_sys = p_stream->p_sys;
    sout_stream_id_t *id;

    id = malloc( sizeof( sout_stream_id_t ) );
    memset( id, 0, sizeof(sout_stream_id_t) );

    id->id = NULL;
    id->p_decoder = NULL;
    id->p_encoder = NULL;

    /* Create decoder object */
    id->p_decoder = vlc_object_create( p_stream, VLC_OBJECT_DECODER );
    if( !id->p_decoder )
    {
        msg_Err( p_stream, "out of memory" );
        goto error;
    }
    vlc_object_attach( id->p_decoder, p_stream );
    id->p_decoder->p_module = NULL;
    id->p_decoder->fmt_in = *p_fmt;
    id->p_decoder->b_pace_control = VLC_TRUE;

    /* Create encoder object */
    id->p_encoder = vlc_object_create( p_stream, VLC_OBJECT_ENCODER );
    if( !id->p_encoder )
    {
        msg_Err( p_stream, "out of memory" );
        goto error;
    }
    vlc_object_attach( id->p_encoder, p_stream );
    id->p_encoder->p_module = NULL;

    /* Create destination format */
    es_format_Init( &id->p_encoder->fmt_out, p_fmt->i_cat, 0 );
    id->p_encoder->fmt_out.i_id    = p_fmt->i_id;
    id->p_encoder->fmt_out.i_group = p_fmt->i_group;
    if( p_fmt->psz_language )
        id->p_encoder->fmt_out.psz_language = strdup( p_fmt->psz_language );

    if( p_fmt->i_cat == AUDIO_ES && (p_sys->i_acodec || p_sys->psz_aenc) )
    {
        msg_Dbg( p_stream,
                 "creating audio transcoding from fcc=`%4.4s' to fcc=`%4.4s'",
                 (char*)&p_fmt->i_codec, (char*)&p_sys->i_acodec );

        /* Complete destination format */
        id->p_encoder->fmt_out.i_codec = p_sys->i_acodec;
        id->p_encoder->fmt_out.audio.i_rate = p_sys->i_sample_rate > 0 ?
            p_sys->i_sample_rate : (int)p_fmt->audio.i_rate;
        id->p_encoder->fmt_out.i_bitrate = p_sys->i_abitrate;
        id->p_encoder->fmt_out.audio.i_bitspersample =
            p_fmt->audio.i_bitspersample;
        id->p_encoder->fmt_out.audio.i_channels = p_sys->i_channels > 0 ?
            p_sys->i_channels : p_fmt->audio.i_channels;
        /* Sanity check for audio channels */
        id->p_encoder->fmt_out.audio.i_channels =
            __MIN( id->p_encoder->fmt_out.audio.i_channels,
                   id->p_decoder->fmt_in.audio.i_channels );
        id->p_encoder->fmt_out.audio.i_original_channels =
            id->p_decoder->fmt_in.audio.i_physical_channels;
        if( id->p_decoder->fmt_in.audio.i_channels ==
            id->p_encoder->fmt_out.audio.i_channels )
        {
            id->p_encoder->fmt_out.audio.i_physical_channels =
                id->p_decoder->fmt_in.audio.i_physical_channels;
        }
        else
        {
            id->p_encoder->fmt_out.audio.i_physical_channels =
                pi_channels_maps[id->p_encoder->fmt_out.audio.i_channels];
        }

        /* Build decoder -> filter -> encoder chain */
        if( transcode_audio_new( p_stream, id ) )
        {
            msg_Err( p_stream, "cannot create audio chain" );
            goto error;
        }

        /* Open output stream */
        id->id = p_sys->p_out->pf_add( p_sys->p_out, &id->p_encoder->fmt_out );
        id->b_transcode = VLC_TRUE;

        if( !id->id )
        {
            transcode_audio_close( p_stream, id );
            goto error;
        }

        date_Init( &id->interpolated_pts, p_fmt->audio.i_rate, 1 );
    }
    else if( p_fmt->i_cat == VIDEO_ES &&
             (p_sys->i_vcodec != 0 || p_sys->psz_venc) )
    {
        msg_Dbg( p_stream,
                 "creating video transcoding from fcc=`%4.4s' to fcc=`%4.4s'",
                 (char*)&p_fmt->i_codec, (char*)&p_sys->i_vcodec );

        /* Complete destination format */
        id->p_encoder->fmt_out.i_codec = p_sys->i_vcodec;
        id->p_encoder->fmt_out.video.i_width  = p_sys->i_width & ~1;
        id->p_encoder->fmt_out.video.i_height = p_sys->i_height & ~1;
        id->p_encoder->fmt_out.i_bitrate = p_sys->i_vbitrate;

        /* Build decoder -> filter -> encoder chain */
        if( transcode_video_new( p_stream, id ) )
        {
            msg_Err( p_stream, "cannot create video chain" );
            goto error;
        }

        /* Stream will be added later on because we don't know
         * all the characteristics of the decoded stream yet */
        id->b_transcode = VLC_TRUE;

        if( p_sys->f_fps > 0 )
        {
            id->p_encoder->fmt_out.video.i_frame_rate =
                (p_sys->f_fps * 1001) + 0.5;
            id->p_encoder->fmt_out.video.i_frame_rate_base = 1001;
        }
    }
    else if( p_fmt->i_cat == SPU_ES && (p_sys->i_scodec || p_sys->psz_senc) )
    {
        msg_Dbg( p_stream, "creating subtitles transcoding from fcc=`%4.4s' "
                 "to fcc=`%4.4s'", (char*)&p_fmt->i_codec,
                 (char*)&p_sys->i_scodec );

        /* Complete destination format */
        id->p_encoder->fmt_out.i_codec = p_sys->i_scodec;

        /* build decoder -> filter -> encoder */
        if( transcode_spu_new( p_stream, id ) )
        {
            msg_Err( p_stream, "cannot create subtitles chain" );
            goto error;
        }

        /* open output stream */
        id->id = p_sys->p_out->pf_add( p_sys->p_out, &id->p_encoder->fmt_out );
        id->b_transcode = VLC_TRUE;

        if( !id->id )
        {
            transcode_spu_close( p_stream, id );
            goto error;
        }
    }
    else if( p_fmt->i_cat == SPU_ES && p_sys->b_soverlay )
    {
        msg_Dbg( p_stream, "subtitles (fcc=`%4.4s') overlaying",
                 (char*)&p_fmt->i_codec );

        id->b_transcode = VLC_TRUE;

        /* Build decoder -> filter -> overlaying chain */
        if( transcode_spu_new( p_stream, id ) )
        {
            msg_Err( p_stream, "cannot create subtitles chain" );
            goto error;
        }
    }
    else
    {
        msg_Dbg( p_stream, "not transcoding a stream (fcc=`%4.4s')",
                 (char*)&p_fmt->i_codec );
        id->id = p_sys->p_out->pf_add( p_sys->p_out, p_fmt );
        id->b_transcode = VLC_FALSE;

        if( !id->id ) goto error;
    }

    if( p_sys->b_sout_osd )
    {
        /* Create a fake OSD menu elementary stream */
        if( !p_sys->b_es_osd && (p_sys->i_osdcodec != 0 || p_sys->psz_osdenc) )
        {
            if( transcode_osd_new( p_stream, p_sys->id_osd ) )
            {
                msg_Err( p_stream, "cannot create osd chain" );
                goto error;
            }
            p_sys->b_es_osd = VLC_TRUE;
        }
    }
    return id;

 error:
    if( id->p_decoder )
    {
        vlc_object_detach( id->p_decoder );
        vlc_object_destroy( id->p_decoder );
    }

    if( id->p_encoder )
    {
        vlc_object_detach( id->p_encoder );
        es_format_Clean( &id->p_encoder->fmt_out );
        vlc_object_destroy( id->p_encoder );
    }

    free( id );
    return NULL;
}

static int Del( sout_stream_t *p_stream, sout_stream_id_t *id )
{
    sout_stream_sys_t *p_sys = p_stream->p_sys;

    if( p_sys->b_es_osd )
        transcode_osd_close( p_stream, p_sys->id_osd );

    if( id->b_transcode )
    {
        switch( id->p_decoder->fmt_in.i_cat )
        {
        case AUDIO_ES:
            transcode_audio_close( p_stream, id );
            break;
        case VIDEO_ES:
            transcode_video_close( p_stream, id );
            break;
        case SPU_ES:
            transcode_spu_close( p_stream, id );
            break;
        }
    }

    if( id->id ) p_sys->p_out->pf_del( p_sys->p_out, id->id );

    if( id->p_decoder )
    {
        vlc_object_detach( id->p_decoder );
        vlc_object_destroy( id->p_decoder );
    }

    if( id->p_encoder )
    {
        vlc_object_detach( id->p_encoder );