C++ date_Set函数代码示例

static int Control(demux_t *demux, int query, va_list args)
{
    demux_sys_t *sys = demux->p_sys;

    switch (query) {
    case DEMUX_CAN_SEEK:
        *va_arg(args, bool *) = sys->duration >= 0 && !sys->is_realtime;
        return VLC_SUCCESS;
    case DEMUX_GET_POSITION: {
        double *position = va_arg(args, double *);
        if (sys->duration > 0)
            *position = date_Get(&sys->pts) / (double)sys->duration;
        else
            *position = 0;
        return VLC_SUCCESS;
    }
    case DEMUX_SET_POSITION: {
        if (sys->duration < 0 || sys->is_realtime)
            return VLC_EGENERIC;
        double position = va_arg(args, double);
        date_Set(&sys->pts, position * sys->duration);
        return VLC_SUCCESS;
    }
    case DEMUX_GET_TIME: {
        int64_t *time = va_arg(args, int64_t *);
        *time = sys->pts_origin + date_Get(&sys->pts);
        return VLC_SUCCESS;
    }
    case DEMUX_SET_TIME: {
        if (sys->duration < 0 || sys->is_realtime)
            return VLC_EGENERIC;
        int64_t time = va_arg(args, int64_t);
        date_Set(&sys->pts, VLC_CLIP(time - sys->pts_origin, 0, sys->duration));
        return VLC_SUCCESS;
    }
    case DEMUX_SET_NEXT_DEMUX_TIME: {
        int64_t pts_next = VLC_TS_0 + va_arg(args, int64_t);
        if (sys->pts_next <= VLC_TS_INVALID)
            sys->pts_origin = pts_next;
        sys->pts_next = pts_next;
        return VLC_SUCCESS;
    }
    case DEMUX_GET_LENGTH: {
        int64_t *length = va_arg(args, int64_t *);
        *length = __MAX(sys->duration, 0);
        return VLC_SUCCESS;
    }
    case DEMUX_GET_FPS: {
        double *fps = va_arg(args, double *);
        *fps = (double)sys->pts.i_divider_num / sys->pts.i_divider_den;
        return VLC_SUCCESS;
    }
    case DEMUX_GET_META:
    case DEMUX_HAS_UNSUPPORTED_META:
    case DEMUX_GET_ATTACHMENTS:
    default:
        return VLC_EGENERIC;
    }
}

/****************************************************************************
 * DecodeBlock: the whole thing
 ****************************************************************************
 * This function must be fed with complete frames.
 ****************************************************************************/
static void *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
{
    decoder_sys_t *p_sys = p_dec->p_sys;
    block_t *p_block;
    void *p_buf;

    if( !pp_block || !*pp_block ) return NULL;

    p_block = *pp_block;


    if( p_block->i_pts <= VLC_TS_INVALID && p_block->i_dts <= VLC_TS_INVALID &&
        !date_Get( &p_sys->pts ) )
    {
        /* We've just started the stream, wait for the first PTS. */
        block_Release( p_block );
        return NULL;
    }

    /* Date management: If there is a pts avaliable, use that. */
    if( p_block->i_pts > VLC_TS_INVALID )
    {
        date_Set( &p_sys->pts, p_block->i_pts );
    }
    else if( p_block->i_dts > VLC_TS_INVALID )
    {
        /* NB, davidf doesn't quite agree with this in general, it is ok
         * for rawvideo since it is in order (ie pts=dts), however, it
         * may not be ok for an out-of-order codec, so don't copy this
         * without thinking */
        date_Set( &p_sys->pts, p_block->i_dts );
    }

    if( p_block->i_buffer < p_sys->i_raw_size )
    {
        msg_Warn( p_dec, "invalid frame size (%zu < %zu)",
                  p_block->i_buffer, p_sys->i_raw_size );

        block_Release( p_block );
        return NULL;
    }

    if( p_sys->b_packetizer )
    {
        p_buf = SendFrame( p_dec, p_block );
    }
    else
    {
        p_buf = DecodeFrame( p_dec, p_block );
    }

    /* Date management: 1 frame per packet */
    date_Increment( &p_sys->pts, 1 );
    *pp_block = NULL;

    return p_buf;
}

static int Control (demux_t *demux, int query, va_list args)
{
    demux_sys_t *sys = demux->p_sys;

    switch (query)
    {
        case DEMUX_GET_POSITION:
            *va_arg (args, float *) = 0.f;
            break;

        case DEMUX_GET_LENGTH:
            *va_arg (args, int64_t *) = INT64_C(0);
            break;

        case DEMUX_GET_TIME:
            *va_arg (args, int64_t *) = date_Get (&sys->date);
            break;

        case DEMUX_SET_TIME:
            date_Set (&sys->date, va_arg (args, int64_t));
            break;

        case DEMUX_SET_NEXT_DEMUX_TIME:
        {
            const mtime_t pts = va_arg (args, int64_t );

            if (sys->next_time == VLC_TS_INVALID) /* first invocation? */
            {
                date_Set (&sys->date, pts);
                date_Decrement (&sys->date, 1);
            }
            sys->next_time = pts;
            break;
        }

        case DEMUX_GET_PTS_DELAY:
        {
            int64_t *v = va_arg (args, int64_t *);
            *v = INT64_C(1000) * var_InheritInteger (demux, "live-caching");
            break;
        }

        case DEMUX_CAN_PAUSE:
        case DEMUX_CAN_CONTROL_PACE:
        case DEMUX_CAN_SEEK:
            *va_arg (args, bool *) = true;
            break;

        default:
            return VLC_EGENERIC;
    }
    return VLC_SUCCESS;
}

static int Audio_OnNewBlock(decoder_t *p_dec, block_t *p_block)
{
    decoder_sys_t *p_sys = p_dec->p_sys;

    if (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED))
    {
        if (DecodeFlush(p_dec) != VLC_SUCCESS)
            return -1;
        date_Set(&p_sys->u.audio.i_end_date, VLC_TS_INVALID);
        return 0;
    }

    /* We've just started the stream, wait for the first PTS. */
    if (!date_Get(&p_sys->u.audio.i_end_date))
    {
        if (p_block->i_pts <= VLC_TS_INVALID)
            return 0;
        date_Set(&p_sys->u.audio.i_end_date, p_block->i_pts);
    }

    /* try delayed opening if there is a new extra data */
    if (!p_sys->api->b_started)
    {
        bool b_delayed_start = false;

        switch (p_dec->fmt_in.i_codec)
        {
        case VLC_CODEC_VORBIS:
        case VLC_CODEC_MP4A:
            if (p_dec->fmt_in.i_extra)
                b_delayed_start = true;
        default:
            break;
        }
        if (!p_dec->p_sys->u.audio.i_channels && p_dec->fmt_in.audio.i_channels)
        {
            p_dec->p_sys->u.audio.i_channels = p_dec->fmt_in.audio.i_channels;
            b_delayed_start = true;
        }

        if (b_delayed_start && !p_dec->p_sys->u.audio.i_channels
         && p_sys->u.audio.b_need_channels)
            b_delayed_start = false;

        if (b_delayed_start && StartMediaCodec(p_dec) != VLC_SUCCESS)
            return -1;
        if (!p_sys->api->b_started)
            return 0;
    }
    return 1;
}

/*****************************************************************************
 * Open: check file and initializes structures
 *****************************************************************************/
static int Open( vlc_object_t * p_this )
{
    demux_t     *p_demux = (demux_t*)p_this;
    demux_sys_t *p_sys;

    /* Identify cdg file by extension, as there is no simple way to
     * detect it */
    if( !demux_IsPathExtension( p_demux, ".cdg" ) && !demux_IsForced( p_demux, "cdg" ) )
        return VLC_EGENERIC;

    /* CDG file size has to be multiple of CDG_FRAME_SIZE (it works even
     * if size is unknown ie 0) */
//    if( (stream_Size( p_demux->s ) % CDG_FRAME_SIZE) != 0 )
//    {
//        msg_Err( p_demux, "Reject CDG file based on its size" );
//        return VLC_EGENERIC;
//    }

    p_demux->pf_demux   = Demux;
    p_demux->pf_control = Control;
    p_demux->p_sys      = p_sys = malloc( sizeof( demux_sys_t ) );

    /* */
    es_format_Init( &p_sys->fmt, VIDEO_ES, VLC_CODEC_CDG );
    p_sys->fmt.video.i_width  = 300-2*6;
    p_sys->fmt.video.i_height = 216-2*12 ;

    p_sys->p_es = es_out_Add( p_demux->out, &p_sys->fmt );

    /* There is CDG_FRAME_RATE frames per second */
    date_Init( &p_sys->pts, CDG_FRAME_RATE, 1 );
    date_Set( &p_sys->pts, 1 );

    return VLC_SUCCESS;
}

static int Open (vlc_object_t *obj)
{
    demux_t *demux = (demux_t *)obj;
    demux_sys_t *sys = vlc_malloc(obj, sizeof (*sys));

    if (unlikely(sys == NULL))
        return VLC_ENOMEM;

    es_format_t fmt;
    es_format_Init (&fmt, SPU_ES, VLC_CODEC_ITU_T140);
    sys->es = es_out_Add (demux->out, &fmt);

    unsigned num, den;
    if (var_InheritURational (demux, &num, &den, "timecode-fps")
     || !num || !den)
    {
        msg_Err (demux, "invalid frame rate");
        return VLC_EGENERIC;
    }

    date_Init (&sys->date, num, den);
    date_Set (&sys->date, VLC_TS_0);
    sys->next_time = VLC_TS_INVALID;

    demux->p_sys = sys;
    demux->pf_demux   = Demux;
    demux->pf_control = Control;
    return VLC_SUCCESS;
}

/*****************************************************************************
 * OpenDecoder: probe the decoder and return score
 *****************************************************************************/
static int OpenDecoder( vlc_object_t *p_this )
{
    decoder_t *p_dec = (decoder_t*)p_this;
    decoder_sys_t *p_sys;

    if( p_dec->fmt_in.i_codec != VLC_CODEC_OPUS )
        return VLC_EGENERIC;

    /* Allocate the memory needed to store the decoder's structure */
    if( ( p_dec->p_sys = p_sys = malloc(sizeof(decoder_sys_t)) ) == NULL )
        return VLC_ENOMEM;
    p_dec->p_sys->b_has_headers = false;

    date_Set( &p_sys->end_date, 0 );

    /* Set output properties */
    p_dec->fmt_out.i_cat = AUDIO_ES;
    p_dec->fmt_out.i_codec = VLC_CODEC_FL32;

    p_dec->pf_decode_audio = DecodeBlock;
    p_dec->pf_packetize    = DecodeBlock;

    p_sys->p_st = NULL;

    return VLC_SUCCESS;
}

static int SeekSet0 (demux_t *demux)
{
    stream_t *stream = demux->s;
    demux_sys_t *sys = demux->p_sys;

    /* Default SMF tempo is 120BPM, i.e. half a second per quarter note */
    date_Init (&sys->pts, sys->ppqn * 2, 1);
    date_Set (&sys->pts, VLC_TS_0);
    sys->pulse = 0;
    sys->tick = VLC_TS_0;

    for (unsigned i = 0; i < sys->trackc; i++)
    {
        mtrk_t *tr = sys->trackv + i;

        tr->offset = 0;
        tr->next = 0;
        /* Why 0xF6 (Tuning Calibration)?
         * Because it has zero bytes of data, so the parser will detect the
         * error if the first event uses running status. */
        tr->running_event = 0xF6;

        if (stream_Seek (stream, tr->start)
         || ReadDeltaTime (stream, tr))
        {
            msg_Err (demux, "fatal parsing error");
            return -1;
        }
    }

    return 0;
}

/*****************************************************************************
 * Demux: read packet and send them to decoders
 *****************************************************************************
 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
 *****************************************************************************/
static int Demux( demux_t *p_demux )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    block_t     *p_block;
    vlc_tick_t  i_date;

    p_block = vlc_stream_Block( p_demux->s, CDG_FRAME_SIZE );
    if( p_block == NULL )
    {
        msg_Dbg( p_demux, "cannot read data, eof" );
        return VLC_DEMUXER_EOF;
    }

    i_date = PosToDate( p_demux );
    if( i_date >= date_Get( &p_sys->pts ) + CDG_FRAME_DELTA )
    {
        p_block->i_dts = p_block->i_pts = VLC_TICK_0 + i_date;
        date_Set( &p_sys->pts, VLC_TICK_0 + i_date );
    }
    else
    {
        p_block->i_dts = VLC_TICK_0 + i_date;
        p_block->i_pts = date_Get( &p_sys->pts );
    }

    es_out_SetPCR( p_demux->out, p_block->i_pts );
    es_out_Send( p_demux->out, p_sys->p_es, p_block );
    return VLC_DEMUXER_SUCCESS;
}

/*****************************************************************************
 * ProcessPacket: processes a Opus packet.
 *****************************************************************************/
static void *ProcessPacket( decoder_t *p_dec, ogg_packet *p_oggpacket,
                            block_t **pp_block )
{
    decoder_sys_t *p_sys = p_dec->p_sys;
    block_t *p_block = *pp_block;

    /* Date management */
    if( p_block && p_block->i_pts > VLC_TS_INVALID &&
        p_block->i_pts != date_Get( &p_sys->end_date ) )
    {
        date_Set( &p_sys->end_date, p_block->i_pts );
    }

    if( !date_Get( &p_sys->end_date ) )
    {
        /* We've just started the stream, wait for the first PTS. */
        if( p_block ) block_Release( p_block );
        return NULL;
    }

    *pp_block = NULL; /* To avoid being fed the same packet again */

    if( !p_block )
        return NULL;

    block_t *p_aout_buffer = DecodePacket( p_dec, p_oggpacket,
                                           p_block->i_nb_samples,
                                           (int)p_block->i_length );

    block_Release( p_block );
    return p_aout_buffer;
}

/*****************************************************************************
 * OpenCommon:
 *****************************************************************************/
static int OpenCommon( vlc_object_t *p_this, bool b_packetizer )
{
    decoder_t *p_dec = (decoder_t*)p_this;
    decoder_sys_t *p_sys;

    if( p_dec->fmt_in.i_codec != VLC_CODEC_DTS )
        return VLC_EGENERIC;

    /* Allocate the memory needed to store the decoder's structure */
    if( ( p_dec->p_sys = p_sys = malloc(sizeof(*p_sys)) ) == NULL )
        return VLC_ENOMEM;

    /* Misc init */
    p_sys->b_packetizer = b_packetizer;
    p_sys->i_state = STATE_NOSYNC;
    date_Set( &p_sys->end_date, 0 );
    p_sys->b_dts_hd = false;
    p_sys->i_pts = VLC_TS_INVALID;

    block_BytestreamInit( &p_sys->bytestream );

    /* Set output properties */
    p_dec->fmt_out.i_cat = AUDIO_ES;
    p_dec->fmt_out.i_codec = VLC_CODEC_DTS;
    p_dec->fmt_out.audio.i_rate = 0; /* So end_date gets initialized */

    /* Set callback */
    p_dec->pf_decode_audio = DecodeBlock;
    p_dec->pf_packetize    = DecodeBlock;

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Demux: read packet and send them to decoders
 *****************************************************************************
 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
 *****************************************************************************/
static int Demux( demux_t *p_demux )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    block_t     *p_block;
    mtime_t     i_date;
    mtime_t     i_delta;

    i_delta = INT64_C(1000000) / CDG_FRAME_RATE;

    p_block = vlc_stream_Block( p_demux->s, CDG_FRAME_SIZE );
    if( p_block == NULL )
    {
        msg_Dbg( p_demux, "cannot read data, eof" );
        return 0;
    }

    i_date = vlc_stream_Tell( p_demux->s ) / CDG_FRAME_SIZE * i_delta;
    if( i_date >= date_Get( &p_sys->pts ) + i_delta )
    {
        p_block->i_dts = p_block->i_pts = i_date;
        date_Set( &p_sys->pts, i_date );
    }
    else
    {
        p_block->i_dts = i_date;
        p_block->i_pts = date_Get( &p_sys->pts );
    }

    es_out_SetPCR( p_demux->out, p_block->i_pts );

    es_out_Send( p_demux->out, p_sys->p_es, p_block );

    return 1;
}

/****************************************************************************
 * Helpers
 ****************************************************************************/
static void PacketizeReset( void *p_private, bool b_broken )
{
    decoder_t *p_dec = p_private;
    decoder_sys_t *p_sys = p_dec->p_sys;

    if( b_broken || !p_sys->b_slice )
    {
        DropStoredNAL( p_sys );
        p_sys->b_new_sps = false;
        p_sys->b_new_pps = false;
        p_sys->p_active_pps = NULL;
        p_sys->p_active_sps = NULL;
        p_sys->i_frame_pts = VLC_TS_INVALID;
        p_sys->i_frame_dts = VLC_TS_INVALID;
        p_sys->slice.type = H264_SLICE_TYPE_UNKNOWN;
        p_sys->b_slice = false;
        /* POC */
        h264_poc_context_init( &p_sys->pocctx );
        p_sys->prevdatedpoc.pts = VLC_TS_INVALID;
        /* From SEI */
        p_sys->i_dpb_output_delay = 0;
        p_sys->i_pic_struct = UINT8_MAX;
        p_sys->i_recovery_frame_cnt = UINT_MAX;
    }
    p_sys->i_next_block_flags = BLOCK_FLAG_DISCONTINUITY;
    p_sys->b_recovered = false;
    p_sys->i_recoveryfnum = UINT_MAX;
    date_Set( &p_sys->dts, VLC_TS_INVALID );
}

static int Audio_OnNewBlock(decoder_t *p_dec, block_t *p_block, int *p_flags)
{
    decoder_sys_t *p_sys = p_dec->p_sys;

    /* We've just started the stream, wait for the first PTS. */
    if (!date_Get(&p_sys->u.audio.i_end_date))
    {
        if (p_block->i_pts <= VLC_TS_INVALID)
            return 0;
        date_Set(&p_sys->u.audio.i_end_date, p_block->i_pts);
    }

    /* try delayed opening if there is a new extra data */
    if (!p_sys->api->b_started)
    {
        p_dec->p_sys->u.audio.i_channels = p_dec->fmt_in.audio.i_channels;

        *p_flags |= NEWBLOCK_FLAG_RESTART;

        /* Don't start if we don't have any csd */
        if ((p_sys->i_quirks & OMXCODEC_QUIRKS_NEED_CSD)
         && !p_dec->fmt_in.i_extra)
            *p_flags &= ~NEWBLOCK_FLAG_RESTART;

        /* Don't start if we don't have a valid channels count */
        if ((p_sys->i_quirks & OMXCODEC_AUDIO_QUIRKS_NEED_CHANNELS)
         && !p_dec->p_sys->u.audio.i_channels)
            *p_flags &= ~NEWBLOCK_FLAG_RESTART;
    }
    return 1;
}

/****************************************************************************
 * DecodeBlock: the whole thing
 ****************************************************************************
 * This function must be fed with complete frames.
 ****************************************************************************/
static block_t *DecodeBlock( decoder_t *p_dec, block_t *p_block )
{
    decoder_sys_t *p_sys = p_dec->p_sys;

    if( p_block->i_flags & (BLOCK_FLAG_CORRUPTED|BLOCK_FLAG_DISCONTINUITY) )
    {
        date_Set( &p_sys->pts, p_block->i_dts );
        if( p_block->i_flags & BLOCK_FLAG_CORRUPTED )
        {
            block_Release( p_block );
            return NULL;
        }
    }

    if( p_block->i_pts <= VLC_TS_INVALID && p_block->i_dts <= VLC_TS_INVALID &&
        !date_Get( &p_sys->pts ) )
    {
        /* We've just started the stream, wait for the first PTS. */
        block_Release( p_block );
        return NULL;
    }

    /* Date management: If there is a pts avaliable, use that. */
    if( p_block->i_pts > VLC_TS_INVALID )
    {
        date_Set( &p_sys->pts, p_block->i_pts );
    }
    else if( p_block->i_dts > VLC_TS_INVALID )
    {
        /* NB, davidf doesn't quite agree with this in general, it is ok
         * for rawvideo since it is in order (ie pts=dts), however, it
         * may not be ok for an out-of-order codec, so don't copy this
         * without thinking */
        date_Set( &p_sys->pts, p_block->i_dts );
    }

    if( p_block->i_buffer < p_sys->size )
    {
        msg_Warn( p_dec, "invalid frame size (%zu < %zu)",
                  p_block->i_buffer, p_sys->size );

        block_Release( p_block );
        return NULL;
    }

    return p_block;
}