/*****************************************************************************
* Open: probe the packetizer and return score
*****************************************************************************/
static int Open( 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_MP4V )
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;
memset( p_sys, 0, sizeof(decoder_sys_t) );
/* Misc init */
packetizer_Init( &p_sys->packetizer,
p_mp4v_startcode, sizeof(p_mp4v_startcode), startcode_FindAnnexB,
NULL, 0, 4,
PacketizeReset, PacketizeParse, PacketizeValidate, p_dec );
p_sys->p_frame = NULL;
p_sys->pp_last = &p_sys->p_frame;
/* Setup properties */
es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
p_dec->fmt_out.i_codec = VLC_CODEC_MP4V;
free(p_dec->fmt_out.p_extra);
if( p_dec->fmt_in.i_extra )
{
/* We have a vol */
p_dec->fmt_out.i_extra = p_dec->fmt_in.i_extra;
p_dec->fmt_out.p_extra = xmalloc( p_dec->fmt_in.i_extra );
memcpy( p_dec->fmt_out.p_extra, p_dec->fmt_in.p_extra,
p_dec->fmt_in.i_extra );
msg_Dbg( p_dec, "opening with vol size: %d", p_dec->fmt_in.i_extra );
ParseVOL( p_dec, &p_dec->fmt_out,
p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
}
else
{
/* No vol, we'll have to look for one later on */
p_dec->fmt_out.i_extra = 0;
p_dec->fmt_out.p_extra = 0;
}
/* Set callback */
p_dec->pf_packetize = Packetize;
p_dec->pf_flush = PacketizeFlush;
return VLC_SUCCESS;
}
/*****************************************************************************
* ParseMPEGBlock: Re-assemble fragments into a block containing a picture
*****************************************************************************/
static block_t *ParseMPEGBlock( decoder_t *p_dec, block_t *p_frag )
{
decoder_sys_t *p_sys = p_dec->p_sys;
block_t *p_pic = NULL;
if( p_frag->p_buffer[3] == 0xB0 || p_frag->p_buffer[3] == 0xB1 || p_frag->p_buffer[3] == 0xB2 )
{ /* VOS and USERDATA */
#if 0
/* Remove VOS start/end code from the original stream */
block_Release( p_frag );
#else
/* Append the block for now since ts/ps muxers rely on VOL
* being present in the stream */
block_ChainLastAppend( &p_sys->pp_last, p_frag );
#endif
return NULL;
}
if( p_frag->p_buffer[3] >= 0x20 && p_frag->p_buffer[3] <= 0x2f )
{
/* Copy the complete VOL */
if( (size_t)p_dec->fmt_out.i_extra != p_frag->i_buffer )
{
p_dec->fmt_out.p_extra =
xrealloc( p_dec->fmt_out.p_extra, p_frag->i_buffer );
p_dec->fmt_out.i_extra = p_frag->i_buffer;
}
memcpy( p_dec->fmt_out.p_extra, p_frag->p_buffer, p_frag->i_buffer );
ParseVOL( p_dec, &p_dec->fmt_out,
p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
#if 0
/* Remove from the original stream */
block_Release( p_frag );
#else
/* Append the block for now since ts/ps muxers rely on VOL
* being present in the stream */
block_ChainLastAppend( &p_sys->pp_last, p_frag );
#endif
return NULL;
}
else
{
if( !p_dec->fmt_out.i_extra )
{
msg_Warn( p_dec, "waiting for VOL" );
block_Release( p_frag );
return NULL;
}
/* Append the block */
block_ChainLastAppend( &p_sys->pp_last, p_frag );
}
if( p_frag->p_buffer[3] == 0xb6 &&
ParseVOP( p_dec, p_frag ) == VLC_SUCCESS )
{
/* We are dealing with a VOP */
p_pic = block_ChainGather( p_sys->p_frame );
p_pic->i_flags = p_sys->i_flags;
p_pic->i_pts = p_sys->i_interpolated_pts;
p_pic->i_dts = p_sys->i_interpolated_dts;
if ( p_dec->fmt_out.video.i_cpb_buffer && p_dec->fmt_out.i_bitrate )
{
mtime_t i_cpb_delay = p_sys->i_vbv_occupancy * INT64_C(1000000)
/ p_dec->fmt_out.i_bitrate;
p_pic->i_delay = i_cpb_delay;
}
else
p_pic->i_delay = DEFAULT_DELAY * 1000;
/* Reset context */
p_sys->p_frame = NULL;
p_sys->pp_last = &p_sys->p_frame;
}
return p_pic;
}
