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vlc/include/input_ext-dec.h
Cyril Deguet adff2a8501 Re-added the new packet allocation method in PS input, using packet caches. 
With warning level 1, you can see when a packet is allocated or freed; the
goal is to never call 'malloc' nor 'free', except at the beginning of the
stream.
The size of the different caches can be adjusted in plugins/mpeg/input_ps.h.
If 'free' is called too often, it means that a cache is too small, so try
to increase its size.
2001-04-16 12:34:28 +00:00

582 lines
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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 1.28 2001/04/16 12:34:28 asmax Exp $
*
* Authors: Christophe Massiot <massiot@via.ecp.fr>
* Michel Kaempf <maxx@via.ecp.fr>
*
* 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 */
long l_size; /* buffer size */
/* 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 ? */
int * pi_refcount;
/* 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_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; /* PTS for this packet (zero if unset) */
mtime_t i_dts; /* DTS for this packet (zero if unset) */
int i_rate; /* current pace of reading
* (see stream_control.h) */
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 contained by 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;
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
{
/*
* Bit structures
*/
bit_fifo_t fifo;
/*
* 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 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;
} bit_stream_t;
/*****************************************************************************
* 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
#elif (WORD_TYPE == u64)
# define WORD_AT U64_AT
#else
# error Unsupported WORD_TYPE
#endif
/*****************************************************************************
* Protoypes from input_ext-dec.c
*****************************************************************************/
u32 UnalignedShowBits( struct bit_stream_s *, unsigned int );
void UnalignedRemoveBits( struct bit_stream_s * );
u32 UnalignedGetBits( struct bit_stream_s *, unsigned int );
/*****************************************************************************
* 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
{
p_bit_stream->pf_next_data_packet( 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 );
}
/*****************************************************************************
* 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 );
((WORD_TYPE *)p_bit_stream->p_byte)++;
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);
((WORD_TYPE *)p_bit_stream->p_byte)++;
return;
}
((WORD_TYPE *)p_bit_stream->p_byte)++;
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 );
((WORD_TYPE *)p_bit_stream->p_byte)++;
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 );
}
/*****************************************************************************
* 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 );
((WORD_TYPE *)p_bit_stream->p_byte)++;
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 );
((WORD_TYPE *)p_bit_stream->p_byte)++;
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 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( p_bit_stream->fifo.i_available )
{
*((WORD_TYPE *)p_buffer) = WORD_AT( &p_bit_stream->fifo.buffer );
p_buffer += p_bit_stream->fifo.i_available >> 3;
i_buf_len -= p_bit_stream->fifo.i_available >> 3;
p_bit_stream->fifo.buffer = 0;
p_bit_stream->fifo.i_available = 0;
}
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 && !p_bit_stream->p_decoder_fifo->b_die );
if( i_buf_len )
{
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 );
}
}
/*
* The following functions are now deprecated.
*/
static __inline__ byte_t _GetByte( bit_stream_t * p_bit_stream )
{
if ( p_bit_stream->p_byte >= p_bit_stream->p_end )
{
p_bit_stream->pf_next_data_packet( p_bit_stream );
}
return( *(p_bit_stream->p_byte++) );
}
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 ))
<< (8 * sizeof(WORD_TYPE) - 8
- p_bit_stream->fifo.i_available);
p_bit_stream->fifo.i_available += 8;
}
}
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;
}
/*
* 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
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