-} pes_packet_t;
-
-/*****************************************************************************
- * decoder_fifo_t
- *****************************************************************************
- * This rotative FIFO contains PES packets that are to be decoded.
- *****************************************************************************/
-typedef struct decoder_fifo_s
-{
- /* Thread structures */
- vlc_mutex_t data_lock; /* fifo data lock */
- vlc_cond_t data_wait; /* fifo data conditional variable */
-
- /* Data */
- pes_packet_t * buffer[FIFO_SIZE + 1];
- int i_start;
- int i_end;
-
- /* Communication interface between input and decoders */
- boolean_t b_die; /* the decoder should return now */
- boolean_t b_error; /* the decoder is in an error loop */
- void * p_packets_mgt; /* packets management services
- * data (netlist...) */
- void (* pf_delete_pes)( void *, pes_packet_t * );
- /* function to use when releasing a PES */
-} decoder_fifo_t;
-
-/* Macros to manage a decoder_fifo_t structure. Please remember to take
- * data_lock before using them. */
-#define DECODER_FIFO_ISEMPTY( fifo ) ( (fifo).i_start == (fifo).i_end )
-#define DECODER_FIFO_ISFULL( fifo ) ( ( ((fifo).i_end + 1 - (fifo).i_start)\
- & FIFO_SIZE ) == 0 )
-#define DECODER_FIFO_START( fifo ) ( (fifo).buffer[ (fifo).i_start ] )
-#define DECODER_FIFO_INCSTART( fifo ) ( (fifo).i_start = ((fifo).i_start + 1)\
- & FIFO_SIZE )
-#define DECODER_FIFO_END( fifo ) ( (fifo).buffer[ (fifo).i_end ] )
-#define DECODER_FIFO_INCEND( fifo ) ( (fifo).i_end = ((fifo).i_end + 1) \
- & FIFO_SIZE )
-
-/*****************************************************************************
- * bit_fifo_t : bit fifo descriptor
- *****************************************************************************
- * This type describes a bit fifo used to store bits while working with the
- * input stream at the bit level.
- *****************************************************************************/
-typedef u32 WORD_TYPE; /* only u32 is supported at the moment */
-
-typedef struct bit_fifo_s
-{
- /* This unsigned integer allows us to work at the bit level. This buffer
- * can contain 32 bits, and the used space can be found on the MSb's side
- * and the available space on the LSb's side. */
- WORD_TYPE buffer;
-
- /* Number of bits available in the bit buffer */
- int i_available;
-
-} bit_fifo_t;
-
-/*****************************************************************************
- * bit_stream_t : bit stream descriptor
- *****************************************************************************
- * This type, based on a PES stream, includes all the structures needed to
- * handle the input stream like a bit stream.
- *****************************************************************************/
-typedef struct bit_stream_s
-{
- /*
- * Input structures
- */
- /* The decoder fifo contains the data of the PES stream */
- decoder_fifo_t * p_decoder_fifo;
-
- /* Function to jump to the next data packet */
- void (* pf_next_data_packet)( struct bit_stream_s * );
-
- /*
- * Byte structures
- */
- /* Current data packet (in the current PES packet of the PES stream) */
- data_packet_t * p_data;
- /* Pointer to the next byte that is to be read (in the current TS packet) */
- byte_t * p_byte;
- /* Pointer to the last byte that is to be read (in the current TS packet */
- byte_t * p_end;
-
- /*
- * Bit structures
- */
- bit_fifo_t fifo;
-} bit_stream_t;
-
-/*****************************************************************************
- * Inline functions used by the decoders to read bit_stream_t
- *****************************************************************************/
-
-/*
- * Philosophy of the first implementation : the bit buffer is first filled by
- * NeedBits, then the buffer can be read via p_bit_stream->fifo.buffer, and
- * unnecessary bits are dumped with a DumpBits() call.
- */
-
-/*****************************************************************************
- * GetByte : reads the next byte in the input stream
- *****************************************************************************/
-static __inline__ byte_t GetByte( bit_stream_t * p_bit_stream )
-{
- /* Are there some bytes left in the current data packet ? */
- /* could change this test to have a if (! (bytes--)) instead */
- if ( p_bit_stream->p_byte >= p_bit_stream->p_end )
- {
- /* no, switch to next data packet */
- p_bit_stream->pf_next_data_packet( p_bit_stream );
- }
-
- return( *(p_bit_stream->p_byte++) );
-}
-
-/*****************************************************************************
- * NeedBits : reads i_bits new bits in the bit stream and stores them in the
- * bit buffer
- *****************************************************************************
- * - i_bits must be less or equal 32 !
- * - There is something important to notice with that function : if the number
- * of bits available in the bit buffer when calling NeedBits() is greater than
- * 24 (i_available > 24) but less than the number of needed bits
- * (i_available < i_bits), the byte returned by GetByte() will be shifted with
- * a negative value and the number of bits available in the bit buffer will be
- * set to more than 32 !
- *****************************************************************************/
-static __inline__ void NeedBits( bit_stream_t * p_bit_stream, int i_bits )
-{
- while ( p_bit_stream->fifo.i_available < i_bits )
- {
- p_bit_stream->fifo.buffer |= ((WORD_TYPE)GetByte( p_bit_stream ))
- << (sizeof(WORD_TYPE) - 8
- - p_bit_stream->fifo.i_available);
- p_bit_stream->fifo.i_available += 8;
- }
-}
-
-/*****************************************************************************
- * DumpBits : removes i_bits bits from the bit buffer
- *****************************************************************************
- * - i_bits <= i_available
- * - i_bits < 32 (because (u32 << 32) <=> (u32 = u32))
- *****************************************************************************/
-static __inline__ void DumpBits( bit_stream_t * p_bit_stream, int i_bits )
-{
- p_bit_stream->fifo.buffer <<= i_bits;
- p_bit_stream->fifo.i_available -= i_bits;
-}
-
-
-/*
- * Philosophy of the second implementation : WORD_LENGTH (usually 32) bits
- * are read at the same time, thus minimizing the number of p_byte changes.
- * Bits are read via GetBits() or ShowBits. This is slightly faster. Be
- * aware that if, in the forthcoming functions, i_bits > 24, the data have to
- * be already aligned on an 8-bit boundary, or wrong results will be
- * returned.
- */
-
-#if (WORD_TYPE != u32)
-# error Not supported word
-#endif
-
-/*
- * This is stolen from the livid source who stole it from the kernel
- * FIXME: The macro swab32 for little endian machines does
- * not seem to work correctly
- */
-
-#if defined(SYS_BEOS)
-# define swab32(x) B_BENDIAN_TO_HOST_INT32(x)
-#else
-# if __BYTE_ORDER == __BIG_ENDIAN
-# define swab32(x) (x)
-# else
-# if defined (__i386__)
-static __inline__ const u32 __i386_swab32( u32 x )
-{
- __asm__("bswap %0" : "=r" (x) : "0" (x));
- return x;
-}
-# define swab32(x) __i386_swab32(x)
-# else
-# define swab32(x) \
- ( ( (u32)(((u8*)&x)[0]) << 24 ) | ( (u32)(((u8*)&x)[1]) << 16 ) |\
- ( (u32)(((u8*)&x)[2]) << 8 ) | ( (u32)(((u8*)&x)[3])) )
-# endif
-# endif
-#endif
-
-/*****************************************************************************
- * ShowBits : return i_bits bits from the bit stream
- *****************************************************************************/
-static __inline__ WORD_TYPE ShowWord( bit_stream_t * p_bit_stream )
-{
- if( p_bit_stream->p_byte <= p_bit_stream->p_end - sizeof(WORD_TYPE) )
- {
- return( swab32( *((WORD_TYPE *)p_bit_stream->p_byte) ) );
- }
-
- p_bit_stream->pf_next_data_packet( p_bit_stream );
- return( swab32( *((WORD_TYPE *)p_bit_stream->p_byte) ) );
-}
-
-static __inline__ WORD_TYPE ShowBits( bit_stream_t * p_bit_stream, int i_bits )
-{
- if( p_bit_stream->fifo.i_available >= i_bits )
- {
- return( p_bit_stream->fifo.buffer >> (8 * sizeof(WORD_TYPE) - i_bits) );
- }
-
- return( (p_bit_stream->fifo.buffer |
- (ShowWord( p_bit_stream ) >> p_bit_stream->fifo.i_available))
- >> (8 * sizeof(WORD_TYPE) - i_bits) );
-}
-
-/*****************************************************************************
- * GetWord : returns the next word to be read
- *****************************************************************************/
-static __inline__ WORD_TYPE GetWord( bit_stream_t * p_bit_stream )
-{
- if( p_bit_stream->p_byte <= p_bit_stream->p_end - sizeof(WORD_TYPE) )
- {
- return( swab32( *(((WORD_TYPE *)p_bit_stream->p_byte)++) ) );
- }
- else
- {
- p_bit_stream->pf_next_data_packet( p_bit_stream );
- return( swab32( *(((WORD_TYPE *)p_bit_stream->p_byte)++) ) );
- }
-}