static int write_buffer_ac3( filter_t *p_filter, block_t *p_in_buf )
{
static const size_t a52_size = A52_FRAME_NB * 4;
if( unlikely( p_in_buf->i_buffer < 6
|| p_in_buf->i_buffer > a52_size
|| p_in_buf->i_nb_samples != A52_FRAME_NB ) )
{
/* Input is not correctly packetizer. Try to parse the buffer in order
* to get the mandatory informations to play AC3 over S/PDIF */
vlc_a52_header_t a52;
if( vlc_a52_header_Parse( &a52, p_in_buf->p_buffer, p_in_buf->i_buffer )
!= VLC_SUCCESS || a52.b_eac3 || a52.i_size > p_in_buf->i_buffer )
return SPDIF_ERROR;
p_in_buf->i_buffer = a52.i_size;
p_in_buf->i_nb_samples = a52.i_samples;
}
if( p_in_buf->i_buffer + SPDIF_HEADER_SIZE > a52_size
|| write_init( p_filter, p_in_buf, a52_size, A52_FRAME_NB ) )
return SPDIF_ERROR;
write_buffer( p_filter, p_in_buf );
write_finalize( p_filter, IEC61937_AC3 |
( ( p_in_buf->p_buffer[5] & 0x7 ) << 8 ) /* bsmod */,
8 /* in bits */ );
return SPDIF_SUCCESS;
}
static int write_buffer_eac3( filter_t *p_filter, block_t *p_in_buf )
{
filter_sys_t *p_sys = p_filter->p_sys;
vlc_a52_header_t a52 = { };
if( vlc_a52_header_Parse( &a52, p_in_buf->p_buffer, p_in_buf->i_buffer )
!= VLC_SUCCESS || a52.i_size > p_in_buf->i_buffer )
return SPDIF_ERROR;
p_in_buf->i_buffer = a52.i_size;
p_in_buf->i_nb_samples = a52.i_samples;
if( !p_sys->p_out_buf
&& write_init( p_filter, p_in_buf, AOUT_SPDIF_SIZE * 4, AOUT_SPDIF_SIZE ) )
return SPDIF_ERROR;
if( p_in_buf->i_buffer > p_sys->p_out_buf->i_buffer - p_sys->i_out_offset )
return SPDIF_ERROR;
write_buffer( p_filter, p_in_buf );
if( a52.b_eac3 )
{
if( ( a52.eac3.strmtyp == EAC3_STRMTYP_INDEPENDENT
|| a52.eac3.strmtyp == EAC3_STRMTYP_AC3_CONVERT )
&& a52.i_blocks_per_sync_frame != 6 )
{
/* cf. Annex E 2.3.1.2 of AC3 spec */
if( a52.eac3.i_substreamid == 0 )
p_sys->eac3.i_nb_blocks_substream0
+= a52.i_blocks_per_sync_frame;
if( p_sys->eac3.i_nb_blocks_substream0 != 6 )
return SPDIF_MORE_DATA;
else
p_sys->eac3.i_nb_blocks_substream0 = 0;
}
write_finalize( p_filter, IEC61937_EAC3, 1 /* in bytes */ );
return SPDIF_SUCCESS;
}
else
return SPDIF_MORE_DATA;
}
/****************************************************************************
* DecodeBlock: the whole thing
****************************************************************************
* This function is called just after the thread is launched.
****************************************************************************/
static block_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
{
decoder_sys_t *p_sys = p_dec->p_sys;
uint8_t p_header[VLC_A52_HEADER_SIZE];
uint8_t *p_buf;
block_t *p_out_buffer;
if( !pp_block || !*pp_block ) return NULL;
if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
{
if( (*pp_block)->i_flags&BLOCK_FLAG_CORRUPTED )
{
p_sys->i_state = STATE_NOSYNC;
block_BytestreamEmpty( &p_sys->bytestream );
}
date_Set( &p_sys->end_date, 0 );
block_Release( *pp_block );
return NULL;
}
if( !date_Get( &p_sys->end_date ) && (*pp_block)->i_pts <= VLC_TS_INVALID)
{
/* We've just started the stream, wait for the first PTS. */
block_Release( *pp_block );
return NULL;
}
block_BytestreamPush( &p_sys->bytestream, *pp_block );
while( 1 )
{
switch( p_sys->i_state )
{
case STATE_NOSYNC:
while( block_PeekBytes( &p_sys->bytestream, p_header, 2 )
== VLC_SUCCESS )
{
if( p_header[0] == 0x0b && p_header[1] == 0x77 )
{
p_sys->i_state = STATE_SYNC;
break;
}
block_SkipByte( &p_sys->bytestream );
}
if( p_sys->i_state != STATE_SYNC )
{
block_BytestreamFlush( &p_sys->bytestream );
/* Need more data */
return NULL;
}
case STATE_SYNC:
/* New frame, set the Presentation Time Stamp */
p_sys->i_pts = p_sys->bytestream.p_block->i_pts;
if( p_sys->i_pts > VLC_TS_INVALID &&
p_sys->i_pts != date_Get( &p_sys->end_date ) )
{
date_Set( &p_sys->end_date, p_sys->i_pts );
}
p_sys->i_state = STATE_HEADER;
case STATE_HEADER:
/* Get A/52 frame header (VLC_A52_HEADER_SIZE bytes) */
if( block_PeekBytes( &p_sys->bytestream, p_header,
VLC_A52_HEADER_SIZE ) != VLC_SUCCESS )
{
/* Need more data */
return NULL;
}
/* Check if frame is valid and get frame info */
if( vlc_a52_header_Parse( &p_sys->frame, p_header, VLC_A52_HEADER_SIZE ) )
{
msg_Dbg( p_dec, "emulated sync word" );
block_SkipByte( &p_sys->bytestream );
p_sys->i_state = STATE_NOSYNC;
break;
}
p_sys->i_state = STATE_NEXT_SYNC;
case STATE_NEXT_SYNC:
/* TODO: If pp_block == NULL, flush the buffer without checking the
* next sync word */
/* Check if next expected frame contains the sync word */
if( block_PeekOffsetBytes( &p_sys->bytestream,
p_sys->frame.i_size, p_header, 2 )
!= VLC_SUCCESS )
{
/* Need more data */
return NULL;
}
if( p_sys->b_packetizer &&
p_header[0] == 0 && p_header[1] == 0 )
{
/* A52 wav files and audio CD's use stuffing */
p_sys->i_state = STATE_GET_DATA;
break;
}
if( p_header[0] != 0x0b || p_header[1] != 0x77 )
{
msg_Dbg( p_dec, "emulated sync word "
"(no sync on following frame)" );
p_sys->i_state = STATE_NOSYNC;
block_SkipByte( &p_sys->bytestream );
break;
}
p_sys->i_state = STATE_SEND_DATA;
break;
case STATE_GET_DATA:
/* Make sure we have enough data.
* (Not useful if we went through NEXT_SYNC) */
if( block_WaitBytes( &p_sys->bytestream,
p_sys->frame.i_size ) != VLC_SUCCESS )
{
/* Need more data */
return NULL;
}
p_sys->i_state = STATE_SEND_DATA;
case STATE_SEND_DATA:
if( !(p_buf = GetOutBuffer( p_dec, &p_out_buffer )) )
{
//p_dec->b_error = true;
return NULL;
}
/* Copy the whole frame into the buffer. When we reach this point
* we already know we have enough data available. */
block_GetBytes( &p_sys->bytestream,
p_buf, __MIN( p_sys->frame.i_size, p_out_buffer->i_buffer ) );
/* Make sure we don't reuse the same pts twice */
if( p_sys->i_pts == p_sys->bytestream.p_block->i_pts )
p_sys->i_pts = p_sys->bytestream.p_block->i_pts = VLC_TS_INVALID;
/* So p_block doesn't get re-added several times */
*pp_block = block_BytestreamPop( &p_sys->bytestream );
p_sys->i_state = STATE_NOSYNC;
return p_out_buffer;
}
}
}
static block_t *PacketizeBlock( decoder_t *p_dec, block_t **pp_block )
{
decoder_sys_t *p_sys = p_dec->p_sys;
uint8_t p_header[VLC_A52_HEADER_SIZE];
block_t *p_out_buffer;
block_t *p_block = pp_block ? *pp_block : NULL;
if( p_block )
{
if( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY | BLOCK_FLAG_CORRUPTED) )
{
/* First always drain complete blocks before discontinuity */
block_t *p_drain = PacketizeBlock( p_dec, NULL );
if(p_drain)
return p_drain;
PacketizeFlush( p_dec );
if( p_block->i_flags & BLOCK_FLAG_CORRUPTED )
{
block_Release( p_block );
return NULL;
}
}
if( !date_Get( &p_sys->end_date ) && p_block->i_pts <= VLC_TS_INVALID)
{
/* We've just started the stream, wait for the first PTS. */
block_Release( p_block );
return NULL;
}
block_BytestreamPush( &p_sys->bytestream, p_block );
}
while( 1 )
{
switch( p_sys->i_state )
{
case STATE_NOSYNC:
while( block_PeekBytes( &p_sys->bytestream, p_header, 2 )
== VLC_SUCCESS )
{
if( p_header[0] == 0x0b && p_header[1] == 0x77 )
{
p_sys->i_state = STATE_SYNC;
break;
}
block_SkipByte( &p_sys->bytestream );
}
if( p_sys->i_state != STATE_SYNC )
{
block_BytestreamFlush( &p_sys->bytestream );
/* Need more data */
return NULL;
}
case STATE_SYNC:
/* New frame, set the Presentation Time Stamp */
p_sys->i_pts = p_sys->bytestream.p_block->i_pts;
if( p_sys->i_pts > VLC_TS_INVALID &&
p_sys->i_pts != date_Get( &p_sys->end_date ) )
{
date_Set( &p_sys->end_date, p_sys->i_pts );
}
p_sys->i_state = STATE_HEADER;
case STATE_HEADER:
/* Get A/52 frame header (VLC_A52_HEADER_SIZE bytes) */
if( block_PeekBytes( &p_sys->bytestream, p_header,
VLC_A52_HEADER_SIZE ) != VLC_SUCCESS )
{
/* Need more data */
return NULL;
}
/* Check if frame is valid and get frame info */
vlc_a52_header_t a52;
if( vlc_a52_header_Parse( &a52, p_header, VLC_A52_HEADER_SIZE ) )
{
msg_Dbg( p_dec, "emulated sync word" );
block_SkipByte( &p_sys->bytestream );
p_sys->i_state = STATE_NOSYNC;
break;
}
if( a52.b_eac3 && a52.eac3.strmtyp != EAC3_STRMTYP_INDEPENDENT )
{
/* Use the channel configuration of the independent stream */
p_sys->frame.i_samples = a52.i_samples;
p_sys->frame.i_size = a52.i_size;
}
else
p_sys->frame = a52;
p_sys->i_state = STATE_NEXT_SYNC;
case STATE_NEXT_SYNC:
/* Check if next expected frame contains the sync word */
if( block_PeekOffsetBytes( &p_sys->bytestream,
p_sys->frame.i_size, p_header, 2 )
!= VLC_SUCCESS )
{
if( p_block == NULL ) /* drain */
{
p_sys->i_state = STATE_GET_DATA;
break;
}
/* Need more data */
return NULL;
}
if( p_header[0] == 0 && p_header[1] == 0 )
{
/* A52 wav files and audio CD's use stuffing */
p_sys->i_state = STATE_GET_DATA;
break;
}
if( p_header[0] != 0x0b || p_header[1] != 0x77 )
{
msg_Dbg( p_dec, "emulated sync word "
"(no sync on following frame)" );
p_sys->i_state = STATE_NOSYNC;
block_SkipByte( &p_sys->bytestream );
break;
}
p_sys->i_state = STATE_GET_DATA;
break;
case STATE_GET_DATA:
/* Make sure we have enough data. */
if( block_WaitBytes( &p_sys->bytestream,
p_sys->frame.i_size ) != VLC_SUCCESS )
{
/* Need more data */
return NULL;
}
p_sys->i_state = STATE_SEND_DATA;
case STATE_SEND_DATA:
if( !(p_out_buffer = GetOutBuffer( p_dec )) )
{
return NULL;
}
/* Copy the whole frame into the buffer. When we reach this point
* we already know we have enough data available. */
block_GetBytes( &p_sys->bytestream, p_out_buffer->p_buffer,
__MIN( p_sys->frame.i_size, p_out_buffer->i_buffer ) );
/* Make sure we don't reuse the same pts twice */
if( p_sys->i_pts == p_sys->bytestream.p_block->i_pts )
p_sys->i_pts = p_sys->bytestream.p_block->i_pts = VLC_TS_INVALID;
if( p_sys->b_discontuinity )
{
p_out_buffer->i_flags |= BLOCK_FLAG_DISCONTINUITY;
p_sys->b_discontuinity = false;
}
/* So p_block doesn't get re-added several times */
if( pp_block )
*pp_block = block_BytestreamPop( &p_sys->bytestream );
p_sys->i_state = STATE_NOSYNC;
return p_out_buffer;
}
}
}
