/*****************************************************************************
* ParseNALBlock: parses annexB type NALs
* All p_frag blocks are required to start with 0 0 0 1 4-byte startcode
*****************************************************************************/
static block_t *ParseNALBlock( decoder_t *p_dec, bool *pb_ts_used, block_t *p_frag )
{
decoder_sys_t *p_sys = p_dec->p_sys;
block_t *p_pic = NULL;
const int i_nal_ref_idc = (p_frag->p_buffer[4] >> 5)&0x03;
const int i_nal_type = p_frag->p_buffer[4]&0x1f;
const mtime_t i_frag_dts = p_frag->i_dts;
const mtime_t i_frag_pts = p_frag->i_pts;
if( p_sys->b_slice && ( !p_sys->b_sps || !p_sys->b_pps ) )
{
block_ChainRelease( p_sys->p_frame );
msg_Warn( p_dec, "waiting for SPS/PPS" );
/* Reset context */
p_sys->slice.i_frame_type = 0;
p_sys->p_frame = NULL;
p_sys->b_frame_sps = false;
p_sys->b_frame_pps = false;
p_sys->b_slice = false;
cc_Flush( &p_sys->cc_next );
}
if( ( !p_sys->b_sps || !p_sys->b_pps ) &&
i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
{
p_sys->b_slice = true;
/* Fragment will be discarded later on */
}
else if( i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
{
slice_t slice;
bool b_new_picture;
ParseSlice( p_dec, &b_new_picture, &slice, i_nal_ref_idc, i_nal_type, p_frag );
/* */
if( b_new_picture && p_sys->b_slice )
p_pic = OutputPicture( p_dec );
/* */
p_sys->slice = slice;
p_sys->b_slice = true;
}
else if( i_nal_type == NAL_SPS )
{
if( p_sys->b_slice )
p_pic = OutputPicture( p_dec );
p_sys->b_frame_sps = true;
PutSPS( p_dec, p_frag );
/* Do not append the SPS because we will insert it on keyframes */
p_frag = NULL;
}
else if( i_nal_type == NAL_PPS )
{
if( p_sys->b_slice )
p_pic = OutputPicture( p_dec );
p_sys->b_frame_pps = true;
PutPPS( p_dec, p_frag );
/* Do not append the PPS because we will insert it on keyframes */
p_frag = NULL;
}
else if( i_nal_type == NAL_AU_DELIMITER ||
i_nal_type == NAL_SEI ||
( i_nal_type >= 13 && i_nal_type <= 18 ) )
{
if( p_sys->b_slice )
p_pic = OutputPicture( p_dec );
/* Parse SEI for CC support */
if( i_nal_type == NAL_SEI )
{
ParseSei( p_dec, p_frag );
}
else if( i_nal_type == NAL_AU_DELIMITER )
{
if( p_sys->p_frame && (p_sys->p_frame->i_flags & BLOCK_FLAG_PRIVATE_AUD) )
{
block_Release( p_frag );
p_frag = NULL;
}
else
{
p_frag->i_flags |= BLOCK_FLAG_PRIVATE_AUD;
}
}
}
/* Append the block */
if( p_frag )
block_ChainAppend( &p_sys->p_frame, p_frag );
*pb_ts_used = false;
if( p_sys->i_frame_dts <= VLC_TS_INVALID &&
p_sys->i_frame_pts <= VLC_TS_INVALID )
{
p_sys->i_frame_dts = i_frag_dts;
p_sys->i_frame_pts = i_frag_pts;
*pb_ts_used = true;
}
return p_pic;
}
/*****************************************************************************
* ParseNALBlock: parses annexB type NALs
* All p_frag blocks are required to start with 0 0 0 1 4-byte startcode
*****************************************************************************/
static block_t *ParseNALBlock( decoder_t *p_dec, bool *pb_ts_used, block_t *p_frag )
{
decoder_sys_t *p_sys = p_dec->p_sys;
block_t *p_pic = NULL;
bool b_new_picture = false;
const int i_nal_type = p_frag->p_buffer[4]&0x1f;
const mtime_t i_frag_dts = p_frag->i_dts;
const mtime_t i_frag_pts = p_frag->i_pts;
if( p_sys->b_slice && (!p_sys->p_active_pps || !p_sys->p_active_sps) )
{
msg_Warn( p_dec, "waiting for SPS/PPS" );
/* Reset context */
p_sys->slice.type = H264_SLICE_TYPE_UNKNOWN;
p_sys->b_slice = false;
DropStoredNAL( p_sys );
/* From SEI */
p_sys->i_dpb_output_delay = 0;
p_sys->i_pic_struct = UINT8_MAX;
cc_storage_reset( p_sys->p_ccs );
}
if( i_nal_type >= H264_NAL_SLICE && i_nal_type <= H264_NAL_SLICE_IDR )
{
h264_slice_t newslice;
if( i_nal_type == H264_NAL_SLICE_IDR )
{
p_sys->b_recovered = true;
p_sys->i_recovery_frame_cnt = UINT_MAX;
p_sys->i_recoveryfnum = UINT_MAX;
}
if( ParseSliceHeader( p_dec, p_frag, &newslice ) )
{
/* Only IDR carries the id, to be propagated */
if( newslice.i_idr_pic_id == -1 )
newslice.i_idr_pic_id = p_sys->slice.i_idr_pic_id;
b_new_picture = IsFirstVCLNALUnit( &p_sys->slice, &newslice );
if( b_new_picture )
{
/* Parse SEI for that frame now we should have matched SPS/PPS */
for( block_t *p_sei = p_sys->p_sei; p_sei; p_sei = p_sei->p_next )
{
HxxxParse_AnnexB_SEI( p_sei->p_buffer, p_sei->i_buffer,
1 /* nal header */, ParseSeiCallback, p_dec );
}
if( p_sys->b_slice )
p_pic = OutputPicture( p_dec );
}
/* */
p_sys->slice = newslice;
}
else
{
p_sys->p_active_pps = NULL;
/* Fragment will be discarded later on */
}
p_sys->b_slice = true;
}
else if( i_nal_type == H264_NAL_SPS )
{
if( p_sys->b_slice )
p_pic = OutputPicture( p_dec );
PutSPS( p_dec, p_frag );
p_sys->b_new_sps = true;
/* Do not append the SPS because we will insert it on keyframes */
p_frag = NULL;
}
else if( i_nal_type == H264_NAL_PPS )
{
if( p_sys->b_slice )
p_pic = OutputPicture( p_dec );
PutPPS( p_dec, p_frag );
p_sys->b_new_pps = true;
/* Do not append the PPS because we will insert it on keyframes */
p_frag = NULL;
}
else if( i_nal_type == H264_NAL_SEI )
{
if( p_sys->b_slice )
p_pic = OutputPicture( p_dec );
block_ChainLastAppend( &p_sys->pp_sei_last, p_frag );
p_frag = NULL;
}
else if( i_nal_type == H264_NAL_END_OF_SEQ || i_nal_type == H264_NAL_END_OF_STREAM )
{
/* Early end of packetization */
block_ChainLastAppend( &p_sys->pp_sei_last, p_frag );
p_frag = NULL;
/* important for still pictures/menus */
p_sys->i_next_block_flags |= BLOCK_FLAG_END_OF_SEQUENCE;
if( p_sys->b_slice )
p_pic = OutputPicture( p_dec );
}
else if( i_nal_type == H264_NAL_AU_DELIMITER ||
( i_nal_type >= H264_NAL_PREFIX && i_nal_type <= H264_NAL_RESERVED_18 ) )
{
if( p_sys->b_slice )
p_pic = OutputPicture( p_dec );
if( i_nal_type == H264_NAL_AU_DELIMITER )
{
if( p_sys->p_frame && (p_sys->p_frame->i_flags & BLOCK_FLAG_PRIVATE_AUD) )
{
block_Release( p_frag );
p_frag = NULL;
}
else
{
p_frag->i_flags |= BLOCK_FLAG_PRIVATE_AUD;
}
}
}
/* Append the block */
if( p_frag )
block_ChainLastAppend( &p_sys->pp_frame_last, p_frag );
*pb_ts_used = false;
if( p_sys->i_frame_dts <= VLC_TS_INVALID &&
p_sys->i_frame_pts <= VLC_TS_INVALID && b_new_picture )
{
p_sys->i_frame_dts = i_frag_dts;
p_sys->i_frame_pts = i_frag_pts;
*pb_ts_used = true;
if( i_frag_dts > VLC_TS_INVALID )
date_Set( &p_sys->dts, i_frag_dts );
}
if( p_pic && (p_pic->i_flags & BLOCK_FLAG_DROP) )
{
block_Release( p_pic );
p_pic = NULL;
}
return p_pic;
}
