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vlc/include/input_ext-dec.h

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/*****************************************************************************
* input_ext-dec.h: structures exported to the VideoLAN decoders
*****************************************************************************
* Copyright (C) 1999, 2000 VideoLAN
* $Id: input_ext-dec.h,v 1.10 2001/01/10 19:22:10 massiot Exp $
*
* Authors:
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
*****************************************************************************/
/* Structures exported to the decoders */
/*****************************************************************************
* data_packet_t
*****************************************************************************
* Describe a data packet.
*****************************************************************************/
typedef struct data_packet_s
{
/* Nothing before this line, the code relies on that */
byte_t * p_buffer; /* raw data packet */
/* Decoders information */
byte_t * p_payload_start;
/* start of the PES payload in this packet */
byte_t * p_payload_end; /* guess ? :-) */
boolean_t b_discard_payload; /* is the packet messed up ? */
/* Used to chain the TS packets that carry data for a same PES or PSI */
struct data_packet_s * p_next;
} data_packet_t;
/*****************************************************************************
* pes_packet_t
*****************************************************************************
* Describes an PES packet, with its properties, and pointers to the TS packets
* containing it.
*****************************************************************************/
typedef struct pes_packet_s
{
/* PES properties */
boolean_t b_messed_up; /* At least one of the data packets
* has a questionable content */
boolean_t b_data_alignment; /* used to find the beginning of
* a video or audio unit */
boolean_t b_discontinuity; /* This packet doesn't follow the
* previous one */
mtime_t i_pts;/* the PTS for this packet (zero if unset) */
mtime_t i_dts;/* the DTS for this packet (zero if unset) */
int i_pes_size; /* size of the current PES packet */
/* Pointers to packets (packets are then linked by the p_prev and
p_next fields of the data_packet_t struct) */
data_packet_t * p_first; /* The first packet containing this
* PES (used by decoders). */
} 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 * );
/* Callback to the decoder used when changing data packets ; set
* to NULL if your decoder doesn't need it. */
void (* pf_bitstream_callback)( struct bit_stream_s *,
boolean_t b_new_pes );
/* Optional argument to the callback */
void * p_callback_arg;
/*
* 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
# ifdef WORDS_BIG_ENDIAN
# define swab32(x) (x)
# else
# if defined (HAVE_X86_BSWAP)
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)++) ) );
}
}
/*****************************************************************************
* RemoveBits : removes i_bits bits from the bit buffer
*****************************************************************************/
static __inline__ void RemoveBits( bit_stream_t * p_bit_stream, 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;
}
p_bit_stream->fifo.buffer = GetWord( p_bit_stream )
<< ( -p_bit_stream->fifo.i_available );
p_bit_stream->fifo.i_available += sizeof(WORD_TYPE) * 8;
}
/*****************************************************************************
* RemoveBits32 : removes 32 bits from the bit buffer (and as a side effect,
* refill it). This should be faster than RemoveBits, though
* RemoveBits will work, too.
*****************************************************************************/
static __inline__ void RemoveBits32( bit_stream_t * p_bit_stream )
{
p_bit_stream->fifo.buffer = GetWord( p_bit_stream )
<< (32 - p_bit_stream->fifo.i_available);
}
/*****************************************************************************
* GetBits : returns i_bits bits from the bit stream and removes them
*****************************************************************************/
static __inline__ WORD_TYPE GetBits( bit_stream_t * p_bit_stream, 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 );
}
i_result = p_bit_stream->fifo.buffer >> (8 * sizeof(WORD_TYPE) - i_bits);
p_bit_stream->fifo.buffer = GetWord( p_bit_stream );
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 );
}
/*****************************************************************************
* GetBits32 : returns 32 bits from the bit stream and removes them
*****************************************************************************/
static __inline__ WORD_TYPE GetBits32( bit_stream_t * p_bit_stream )
{
WORD_TYPE i_result;
i_result = p_bit_stream->fifo.buffer;
p_bit_stream->fifo.buffer = GetWord( p_bit_stream );
i_result |= p_bit_stream->fifo.buffer
>> (p_bit_stream->fifo.i_available);
p_bit_stream->fifo.buffer <<= (8 * sizeof(WORD_TYPE)
- p_bit_stream->fifo.i_available);
return( i_result );
}
/*****************************************************************************
* 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;
}
/*
* Philosophy of the third implementation : the decoder asks for n bytes,
* and we will copy them in its buffer.
*/
/*****************************************************************************
* GetChunk : reads a large chunk of data
*****************************************************************************
* The position in the stream must be byte-aligned, if unsure call
* RealignBits(). p_buffer must 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;
if( (i_available = p_bit_stream->p_end - p_bit_stream->p_byte)
>= i_buf_len )
{
memcpy( p_buffer, p_bit_stream->p_byte, i_buf_len );
p_bit_stream->p_byte += i_buf_len;
}
else
{
do
{
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;
p_bit_stream->pf_next_data_packet( p_bit_stream );
}
while( (i_available = p_bit_stream->p_end - p_bit_stream->p_byte)
<= i_buf_len );
if( i_buf_len )
{
memcpy( p_buffer, p_bit_stream->p_byte, i_buf_len );
p_bit_stream->p_byte += i_buf_len;
}
}
}
/*
* Communication interface between input and decoders
*/
/*****************************************************************************
* decoder_config_t
*****************************************************************************
* Standard pointers given to the decoders as a toolbox.
*****************************************************************************/
typedef struct decoder_config_s
{
u16 i_id;
u8 i_type; /* type of the elementary stream */
struct stream_ctrl_s * p_stream_ctrl;
struct decoder_fifo_s * p_decoder_fifo;
void (* pf_init_bit_stream)( struct bit_stream_s *,
struct decoder_fifo_s * );
} decoder_config_t;
/*****************************************************************************
* vdec_config_t
*****************************************************************************
* Pointers given to video decoders threads.
*****************************************************************************/
struct vout_thread_s;
typedef struct vdec_config_s
{
struct vout_thread_s * p_vout;
struct picture_s * (* pf_create_picture)( struct vout_thread_s *,
int i_type, int i_width,
int i_height );
void (* pf_destroy_picture)( struct vout_thread_s *,
struct picture_s * );
void (* pf_display_picture)( struct vout_thread_s *,
struct picture_s * );
void (* pf_date_picture)( struct vout_thread_s *,
struct picture_s *, mtime_t date );
void (* pf_link_picture)( struct vout_thread_s *,
struct picture_s *, mtime_t date );
void (* pf_unlink_picture)( struct vout_thread_s *,
struct picture_s *, mtime_t date );
struct subpicture_s *(* pf_create_subpicture)( struct vout_thread_s *,
int i_type, int i_size );
void (* pf_destroy_subpicture)( struct vout_thread_s *,
struct subpicture_s * );
void (* pf_display_subpicture)( struct vout_thread_s *,
struct subpicture_s * );
decoder_config_t decoder_config;
} vdec_config_t;
/*****************************************************************************
* adec_config_t
*****************************************************************************
* Pointers given to audio decoders threads.
*****************************************************************************/
struct aout_thread_s;
typedef struct adec_config_s
{
struct aout_thread_s * p_aout;
struct aout_fifo_s * (* pf_create_fifo)( struct aout_thread_s *,
struct aout_fifo_s * );
void (* pf_destroy_fifo)( struct aout_thread_s *);
decoder_config_t decoder_config;
} adec_config_t;
/*
* Communication interface between decoders and input
*/
/*****************************************************************************
* decoder_capabilities_t
*****************************************************************************
* Structure returned by a call to GetCapabilities() of the decoder.
*****************************************************************************/
typedef struct decoder_capabilities_s
{
int i_dec_type;
u8 i_stream_type; /* == i_type in es_descriptor_t */
int i_weight; /* for a given stream type, the decoder
* with higher weight will be spawned */
vlc_thread_t (* pf_create_thread)( void * );
} decoder_capabilities_t;
/* Decoder types */
#define NONE_D 0
#define VIDEO_D 1
#define AUDIO_D 2