static void PacketizeFlush( decoder_t *p_dec ) { decoder_sys_t *p_sys = p_dec->p_sys; p_sys->b_discontinuity = true; date_Set( &p_sys->end_date, 0 ); p_sys->i_state = STATE_NOSYNC; block_BytestreamEmpty( &p_sys->bytestream ); }
/**************************************************************************** * 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; } } }