* input_ext-dec.h: structures exported to the VideoLAN decoders
*****************************************************************************
* Copyright (C) 1999-2001 VideoLAN
- * $Id: input_ext-dec.h,v 1.74 2002/10/24 09:37:48 gbazin Exp $
+ * $Id: input_ext-dec.h,v 1.83 2003/11/24 00:39:00 fenrir Exp $
*
* Authors: Christophe Massiot <massiot@via.ecp.fr>
* Michel Kaempf <maxx@via.ecp.fr>
unsigned int i_nb_data; /* Number of data packets in the chained list */
};
-/*****************************************************************************
- * decoder_fifo_t
- *****************************************************************************
- * This rotative FIFO contains PES packets that are to be decoded.
- *****************************************************************************/
-struct decoder_fifo_t
-{
- VLC_COMMON_MEMBERS
-
- /* Thread structures */
- vlc_mutex_t data_lock; /* fifo data lock */
- vlc_cond_t data_wait; /* fifo data conditional variable */
-
- /* Data */
- pes_packet_t * p_first;
- pes_packet_t ** pp_last;
- int i_depth; /* number of PES packets in the stack */
-
- /* Communication interface between input and decoders */
- input_buffers_t *p_packets_mgt; /* packets management services data */
-
- /* Standard pointers given to the decoders as a toolbox. */
- u16 i_id;
- vlc_fourcc_t i_fourcc;
- es_sys_t * p_demux_data;
- stream_ctrl_t * p_stream_ctrl;
- sout_instance_t * p_sout;
-
- /* Module properties */
- module_t * p_module;
- int ( * pf_run ) ( decoder_fifo_t * );
-};
-
-/*****************************************************************************
- * 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;
-
-typedef struct bit_fifo_t
-{
- /* 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.
- *****************************************************************************/
-struct bit_stream_t
-{
- /*
- * Bit structures
- */
- bit_fifo_t fifo;
-
- /*
- * Input structures
- */
- /* The decoder fifo contains the data of the PES stream */
- decoder_fifo_t * p_decoder_fifo;
-
- /* Callback to the decoder used when changing data packets ; set
- * to NULL if your decoder doesn't need it. */
- void (* pf_bitstream_callback)( bit_stream_t *, vlc_bool_t );
- /* Optional argument to the callback */
- void * p_callback_arg;
-
- /*
- * PTS retrieval
- */
- mtime_t i_pts, i_dts;
- byte_t * p_pts_validity;
-
- /*
- * 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 packet) */
- byte_t * p_byte;
- /* Pointer to the last byte that is to be read (in the current packet */
- byte_t * p_end;
- /* Temporary buffer in case we're not aligned when changing data packets */
- WORD_TYPE i_showbits_buffer;
- data_packet_t showbits_data;
-};
-
-/*****************************************************************************
- * Inline functions used by the decoders to read bit_stream_t
- *****************************************************************************/
-
-/*
- * DISCUSSION : How to use the bit_stream structures
- *
- * sizeof(WORD_TYPE) (usually 32) bits are read at the same time, thus
- * minimizing the number of p_byte changes.
- * Bits are read via GetBits() or ShowBits.
- *
- * XXX : 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. Use RealignBits() if unsure.
- */
-
-#if (WORD_TYPE == u32)
-# define WORD_AT U32_AT
-# define WORD_SIGNED s32
-#elif (WORD_TYPE == u64)
-# define WORD_AT U64_AT
-# define WORD_SIGNED s64
-#else
-# error Unsupported WORD_TYPE
-#endif
-
/*****************************************************************************
* Prototypes from input_ext-dec.c
*****************************************************************************/
-VLC_EXPORT( void, InitBitstream, ( bit_stream_t *, decoder_fifo_t *, void ( * )( bit_stream_t *, vlc_bool_t ), void * p_callback_arg ) );
-VLC_EXPORT( vlc_bool_t, NextDataPacket, ( decoder_fifo_t *, data_packet_t ** ) );
-VLC_EXPORT( pes_packet_t *, GetPES, ( decoder_fifo_t * ) );
-VLC_EXPORT( pes_packet_t *, NextPES, ( decoder_fifo_t * ) );
-VLC_EXPORT( void, BitstreamNextDataPacket, ( bit_stream_t * ) );
-VLC_EXPORT( u32, UnalignedShowBits, ( bit_stream_t *, unsigned int ) );
-VLC_EXPORT( void, UnalignedRemoveBits, ( bit_stream_t * ) );
-VLC_EXPORT( u32, UnalignedGetBits, ( bit_stream_t *, unsigned int ) );
-VLC_EXPORT( void, CurrentPTS, ( bit_stream_t *, mtime_t *, mtime_t * ) );
-VLC_EXPORT( void, NextPTS, ( bit_stream_t *, mtime_t *, mtime_t * ) );
-
-VLC_EXPORT( int, input_ExtractPES, ( decoder_fifo_t *, pes_packet_t ** ) );
-
-/*****************************************************************************
- * AlignWord : fill in the bit buffer so that the byte pointer be aligned
- * on a word boundary (XXX: there must be at least sizeof(WORD_TYPE) - 1
- * empty bytes in the bit buffer)
- *****************************************************************************/
-static inline void AlignWord( bit_stream_t * p_bit_stream )
-{
- while( (ptrdiff_t)p_bit_stream->p_byte
- & (sizeof(WORD_TYPE) - 1) )
- {
- if( p_bit_stream->p_byte < p_bit_stream->p_end )
- {
- p_bit_stream->fifo.buffer |= *(p_bit_stream->p_byte++)
- << (8 * sizeof(WORD_TYPE) - 8
- - p_bit_stream->fifo.i_available);
- p_bit_stream->fifo.i_available += 8;
- }
- else
- {
- BitstreamNextDataPacket( p_bit_stream );
- p_bit_stream->fifo.buffer |= *(p_bit_stream->p_byte++)
- << (8 * sizeof(WORD_TYPE) - 8
- - p_bit_stream->fifo.i_available);
- p_bit_stream->fifo.i_available += 8;
- }
- }
-}
-
-/*****************************************************************************
- * ShowBits : return i_bits bits from the bit stream
- *****************************************************************************/
-static inline u32 ShowBits( bit_stream_t * p_bit_stream, unsigned int i_bits )
-{
- if( p_bit_stream->fifo.i_available >= i_bits )
- {
- return( p_bit_stream->fifo.buffer >> (8 * sizeof(WORD_TYPE) - i_bits) );
- }
-
- if( p_bit_stream->p_byte <= p_bit_stream->p_end - sizeof(WORD_TYPE) )
- {
- return( (p_bit_stream->fifo.buffer |
- (WORD_AT( p_bit_stream->p_byte )
- >> p_bit_stream->fifo.i_available))
- >> (8 * sizeof(WORD_TYPE) - i_bits) );
- }
-
- return( UnalignedShowBits( p_bit_stream, i_bits ) );
-}
-
-/*****************************************************************************
- * ShowSignedBits : return i_bits bits from the bit stream, using signed
- * arithmetic
- *****************************************************************************/
-static inline s32 ShowSignedBits( bit_stream_t * p_bit_stream,
- unsigned int i_bits )
-{
- if( p_bit_stream->fifo.i_available >= i_bits )
- {
- return( (WORD_SIGNED)p_bit_stream->fifo.buffer
- >> (8 * sizeof(WORD_TYPE) - i_bits) );
- }
-
- /* You can probably do something a little faster, but now I'm tired. */
- return( (WORD_SIGNED)(ShowBits( p_bit_stream, i_bits ) << (32 - i_bits))
- >> (32 - i_bits) );
-}
-
-/*****************************************************************************
- * RemoveBits : removes i_bits bits from the bit buffer
- * XXX: do not use for 32 bits, see RemoveBits32
- *****************************************************************************/
-static inline void RemoveBits( bit_stream_t * p_bit_stream,
- unsigned int i_bits )
-{
- p_bit_stream->fifo.i_available -= i_bits;
-
- if( p_bit_stream->fifo.i_available >= 0 )
- {
- p_bit_stream->fifo.buffer <<= i_bits;
- return;
- }
-
- if( p_bit_stream->p_byte <= p_bit_stream->p_end - sizeof(WORD_TYPE) )
- {
- p_bit_stream->fifo.buffer = WORD_AT( p_bit_stream->p_byte )
- << ( -p_bit_stream->fifo.i_available );
- p_bit_stream->p_byte =
- (byte_t *) ( ((WORD_TYPE *)p_bit_stream->p_byte) + 1 );
- p_bit_stream->fifo.i_available += sizeof(WORD_TYPE) * 8;
- return;
- }
-
- UnalignedRemoveBits( p_bit_stream );
-}
-
-/*****************************************************************************
- * RemoveBits32 : removes 32 bits from the bit buffer (and as a side effect,
- * refill it)
- *****************************************************************************/
-#if (WORD_TYPE == u32)
-static inline void RemoveBits32( bit_stream_t * p_bit_stream )
-{
- if( p_bit_stream->p_byte <= p_bit_stream->p_end - sizeof(WORD_TYPE) )
- {
- if( p_bit_stream->fifo.i_available )
- {
- p_bit_stream->fifo.buffer = WORD_AT( p_bit_stream->p_byte )
- << (32 - p_bit_stream->fifo.i_available);
- p_bit_stream->p_byte =
- (byte_t *) ( ((WORD_TYPE *)p_bit_stream->p_byte) + 1 );
- return;
- }
-
- p_bit_stream->p_byte =
- (byte_t *) ( ((WORD_TYPE *)p_bit_stream->p_byte) + 1 );
- return;
- }
-
- p_bit_stream->fifo.i_available -= 32;
- UnalignedRemoveBits( p_bit_stream );
-}
-#else
-# define RemoveBits32( p_bit_stream ) RemoveBits( p_bit_stream, 32 )
-#endif
-
-/*****************************************************************************
- * GetBits : returns i_bits bits from the bit stream and removes them
- * XXX: do not use for 32 bits, see GetBits32
- *****************************************************************************/
-static inline u32 GetBits( bit_stream_t * p_bit_stream, unsigned int i_bits )
-{
- u32 i_result;
-
- p_bit_stream->fifo.i_available -= i_bits;
-
- if( p_bit_stream->fifo.i_available >= 0 )
- {
- i_result = p_bit_stream->fifo.buffer
- >> (8 * sizeof(WORD_TYPE) - i_bits);
- p_bit_stream->fifo.buffer <<= i_bits;
- return( i_result );
- }
-
- if( p_bit_stream->p_byte <= p_bit_stream->p_end - sizeof(WORD_TYPE) )
- {
- i_result = p_bit_stream->fifo.buffer
- >> (8 * sizeof(WORD_TYPE) - i_bits);
- p_bit_stream->fifo.buffer = WORD_AT( p_bit_stream->p_byte );
- p_bit_stream->p_byte =
- (byte_t *) ( ((WORD_TYPE *)p_bit_stream->p_byte) + 1 );
- i_result |= p_bit_stream->fifo.buffer
- >> (8 * sizeof(WORD_TYPE)
- + p_bit_stream->fifo.i_available);
- p_bit_stream->fifo.buffer <<= ( -p_bit_stream->fifo.i_available );
- p_bit_stream->fifo.i_available += sizeof(WORD_TYPE) * 8;
- return( i_result );
- }
-
- return UnalignedGetBits( p_bit_stream, i_bits );
-}
-
-/*****************************************************************************
- * GetSignedBits : returns i_bits bits from the bit stream and removes them,
- * using signed arithmetic
- * XXX: do not use for 32 bits
- *****************************************************************************/
-static inline s32 GetSignedBits( bit_stream_t * p_bit_stream,
- unsigned int i_bits )
-{
- if( p_bit_stream->fifo.i_available >= i_bits )
- {
- s32 i_result;
-
- p_bit_stream->fifo.i_available -= i_bits;
- i_result = (WORD_SIGNED)p_bit_stream->fifo.buffer
- >> (8 * sizeof(WORD_TYPE) - i_bits);
- p_bit_stream->fifo.buffer <<= i_bits;
- return( i_result );
- }
-
- /* You can probably do something a little faster, but now I'm tired. */
- return( (WORD_SIGNED)(GetBits( p_bit_stream, i_bits ) << (32 - i_bits))
- >> (32 - i_bits) );
-}
-
-/*****************************************************************************
- * GetBits32 : returns 32 bits from the bit stream and removes them
- *****************************************************************************/
-#if (WORD_TYPE == u32)
-static inline u32 GetBits32( bit_stream_t * p_bit_stream )
-{
- u32 i_result;
-
- if( p_bit_stream->fifo.i_available == 32 )
- {
- p_bit_stream->fifo.i_available = 0;
- i_result = p_bit_stream->fifo.buffer;
- p_bit_stream->fifo.buffer = 0;
- return( i_result );
- }
-
- if( p_bit_stream->p_byte <= p_bit_stream->p_end - sizeof(WORD_TYPE) )
- {
- if( p_bit_stream->fifo.i_available )
- {
- i_result = p_bit_stream->fifo.buffer;
- p_bit_stream->fifo.buffer = WORD_AT( p_bit_stream->p_byte );
- p_bit_stream->p_byte =
- (byte_t *) ( ((WORD_TYPE *)p_bit_stream->p_byte) + 1 );
- i_result |= p_bit_stream->fifo.buffer
- >> (p_bit_stream->fifo.i_available);
- p_bit_stream->fifo.buffer <<= (32 - p_bit_stream->fifo.i_available);
- return( i_result );
- }
-
- i_result = WORD_AT( p_bit_stream->p_byte );
- p_bit_stream->p_byte =
- (byte_t *) ( ((WORD_TYPE *)p_bit_stream->p_byte) + 1 );
- return( i_result );
- }
-
- p_bit_stream->fifo.i_available -= 32;
- return UnalignedGetBits( p_bit_stream, 32 );
-}
-#else
-# define GetBits32( p_bit_stream ) GetBits( p_bit_stream, 32 )
-#endif
-
-/*****************************************************************************
- * RealignBits : realigns the bit buffer on an 8-bit boundary
- *****************************************************************************/
-static inline void RealignBits( bit_stream_t * p_bit_stream )
-{
- p_bit_stream->fifo.buffer <<= (p_bit_stream->fifo.i_available & 0x7);
- p_bit_stream->fifo.i_available &= ~0x7;
-}
-
-
-/*****************************************************************************
- * GetChunk : reads a large chunk of data
- *****************************************************************************
- * The position in the stream must be byte-aligned, if unsure call
- * RealignBits(). p_buffer must point to a buffer at least as big as i_buf_len
- * otherwise your code will crash.
- *****************************************************************************/
-static inline void GetChunk( bit_stream_t * p_bit_stream,
- byte_t * p_buffer, size_t i_buf_len )
-{
- ptrdiff_t i_available;
-
- /* We need to take care because i_buf_len may be < 4. */
- while( p_bit_stream->fifo.i_available > 0 && i_buf_len )
- {
- *p_buffer = p_bit_stream->fifo.buffer >> (8 * sizeof(WORD_TYPE) - 8);
- p_buffer++;
- i_buf_len--;
- p_bit_stream->fifo.buffer <<= 8;
- p_bit_stream->fifo.i_available -= 8;
- }
-
- if( (i_available = p_bit_stream->p_end - p_bit_stream->p_byte)
- >= i_buf_len )
- {
- p_bit_stream->p_decoder_fifo->p_vlc->pf_memcpy( p_buffer,
- p_bit_stream->p_byte, i_buf_len );
- p_bit_stream->p_byte += i_buf_len;
- }
- else
- {
- do
- {
- p_bit_stream->p_decoder_fifo->p_vlc->pf_memcpy( p_buffer,
- p_bit_stream->p_byte, i_available );
- p_bit_stream->p_byte = p_bit_stream->p_end;
- p_buffer += i_available;
- i_buf_len -= i_available;
- BitstreamNextDataPacket( p_bit_stream );
- if( p_bit_stream->p_decoder_fifo->b_die )
- return;
- }
- while( (i_available = p_bit_stream->p_end - p_bit_stream->p_byte)
- <= i_buf_len );
-
- if( i_buf_len )
- {
- p_bit_stream->p_decoder_fifo->p_vlc->pf_memcpy( p_buffer,
- p_bit_stream->p_byte, i_buf_len );
- p_bit_stream->p_byte += i_buf_len;
- }
- }
-
- if( p_bit_stream->p_byte <= p_bit_stream->p_end - sizeof(WORD_TYPE) )
- {
- AlignWord( p_bit_stream );
- }
-}
-
-
-/*
- * Communication interface between input and decoders
- */
-
-/*****************************************************************************
- * Prototypes from input_dec.c
- *****************************************************************************/
-VLC_EXPORT( void, DecoderError, ( decoder_fifo_t * p_fifo ) );
+VLC_EXPORT( void, input_DeletePES, ( input_buffers_t *, pes_packet_t * ) );
#endif /* "input_ext-dec.h" */
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